WO2015154640A1 - Scr injection metering module and control method - Google Patents

Abstract

An SCR injection metering module and a control method therefor. The module comprises a bracket (7), a pulse pump (1) mounted at one end of the bracket (7), an upper end cover (8) fixed at the other end of the bracket (7), a spray nozzle (18) and a controller (9). The bracket (7) extends from the upper part of a DEF storage tank to the bottom of the DEF storage tank, and is fixed onto the storage tank through the upper end cover (8). The controller (9) controls the operation of the pulse pump (1). The pulse pump (1) comprises a solenoid driver (23) and a plunger pump (22), and an axially penetrating internal flow passage (21), wherein a DEF enters an inlet of the internal flow passage (21) through a first filter (2) arranged at the lower-end inlet of the internal flow passage (21), an outlet of the internal flow passage (21) is higher than the inlet of the internal flow passage (21), a part of the working fluid entering the internal flow passage (21) is pumped to the spray nozzle (18) by the plunger pump (22), and a part thereof is discharged to the pulse pump (1) from the outlet of the internal flow passage (21). The characteristic parameters of the pulse pump (1) are pre-stored in the controller (9), so that the controller (9) can operate in a passive mode or an intelligent mode.

Description

一种SCR喷射计量模块及控制方法SCR injection metering module and control method 技术领域Technical field

本发明属于发动机排气后处理技术领域，具体涉及发动机排气后处理的NOx选择催化还原(SCR)***及其控制技术。The invention belongs to the technical field of engine exhaust aftertreatment, and in particular relates to a NOx selective catalytic reduction (SCR) system for engine exhaust aftertreatment and a control technique thereof.

背景技术Background technique

随着环境问题的日益突出，节能减排已经成为当下热议话题，国家则陆续出台了一系列的车辆排放标准，对此，以内燃机为动力的车辆需要安装排放后处理***以求满足越来越严格的排放要求。例如，目前主要用于对柴油发动机尾气中NOx等污染物进行催化处理的SCR(Selective Catalytic Reduction)技术等。With the increasingly prominent environmental problems, energy saving and emission reduction has become a hot topic at present, and the country has successively introduced a series of vehicle emission standards. For this, internal combustion engine-powered vehicles need to install a post-discharge treatment system to meet the needs. The stricter emission requirements. For example, it is currently mainly used for SCR (Selective Catalytic Reduction) technology for catalytically treating pollutants such as NOx in diesel engine exhaust.

SCR技术需要将例如32.5％重量浓度的尿素水溶液(也叫柴油排气处理液DEF＝Diesel Exhaust Fluid，或者添蓝液AdBlue)定量喷射进柴油机排气中，通过排气高温分解成氨气，与排气混合后进入SCR催化转换器。在催化剂的作用下，氨气就会与发动机排气中的NOx等发生催化还原反应，使NOx分解为无害的N2、H2O，因此需要精度较高的SCR计量喷射装置。The SCR technology needs to quantitatively inject a 32.5% by weight aqueous urea solution (also called diesel exhaust treatment solution DEF=Diesel Exhaust Fluid, or Add Blue Blue) into the diesel exhaust gas, and decompose it into ammonia gas through the exhaust gas. After the exhaust gas is mixed, it enters the SCR catalytic converter. Under the action of the catalyst, the ammonia gas undergoes a catalytic reduction reaction with NOx in the engine exhaust gas, and the NOx is decomposed into harmless N2 and H2O. Therefore, a highly accurate SCR metering injection device is required.

SCR计量喷射装置是一个电脑控制的执行器，其正常工作受环境的影响较大。在零下11℃时，DEF液体会结冰，此时SCR计量喷射装置不能正常工作，若有不慎，也有可能会导致输液管路或者装置损坏等情况发生。另外，DEF在一定的温度条件下会因失去水溶剂而结晶，从而导致装置损毁等严重后果。为了解决上述问题，需要较为复杂的辅助装置和控制方法用于融冰和抽排SCR计量喷射装置或者输液管路中的液体。The SCR metering injection device is a computer-controlled actuator whose normal operation is greatly affected by the environment. At minus 11 ° C, the DEF liquid will freeze. At this time, the SCR metering injection device cannot work normally. If it is inadvertent, it may cause damage to the infusion line or device. In addition, DEF will crystallize due to the loss of water solvent under certain temperature conditions, resulting in serious consequences such as damage to the device. In order to solve the above problems, more complicated auxiliary devices and control methods are required for melting ice and pumping the liquid in the SCR metering injection device or the infusion line.

对于SCR喷射计量***，由于尿素水溶液具有导电性，传统的以直流旋转电泵为动力源的喷射计量***不能嵌入在工作液体中工作，因此多数采用以直流电机驱动的外置膜片泵为动力源，这种***的结构复杂，除了可靠性外，还受环境的影响较大，尤其在低温环境下工作需要复杂的融冰辅助装置，售后服务维护也比较困难，给汽车驾驶者带来诸多的不便。For the SCR injection metering system, since the urea aqueous solution has electrical conductivity, the conventional injection metering system using a DC rotary electric pump as a power source cannot be embedded in the working liquid, so most of them are powered by an external diaphragm pump driven by a DC motor. Source, the structure of this system is complex, in addition to reliability, it is also greatly affected by the environment, especially in low temperature environment, it requires complex ice-melting auxiliary devices, and after-sales service maintenance is also difficult, bringing many drivers to the car. Inconvenience.

美国专利US20090301067A1公开了一种DEF喷射计量装置，其中计量喷射装置是一个螺线管驱动的柱塞泵喷嘴，安装在排气管上，需要外加一个低压泵为其从DEF储液罐提供工作液体，并且需要采取冷却措施才能正常工作。A DEF jet metering device is disclosed in US Patent No. 20090301067 A1, wherein the metering spray device is a solenoid-driven plunger pump nozzle mounted on the exhaust pipe and requires a low pressure pump to supply working fluid from the DEF liquid storage tank. And need to take cooling measures to work properly.

螺线管驱动的柱塞泵是一种可以通过结构设计做到潜入到DEF液体中工作的一种装置。如果将SCR计量泵植入DEF储液罐中，SCR计量泵需要通过结构设计自身解决在无外在动力情况下进液、冷却和蒸汽排除问题。由于DEF工作液的表面张力较高，在加注DEF工作液时，液体往往不能顺利通过过滤器进入SCR计量泵中，从而导致初始进液难的问题。另外，SCR计量泵在工作时会产生大量的蒸汽，如果不能及时排除，会影响其正常工作和冷却。A solenoid-driven plunger pump is a device that can be designed to sneak into a DEF liquid by structural design. If the SCR metering pump is implanted in a DEF reservoir, the SCR metering pump needs to solve the problem of inlet, cooling and steam removal without external power through the structural design itself. Due to the high surface tension of the DEF working fluid, when the DEF working fluid is filled, the liquid often cannot pass through the filter into the SCR metering pump, which causes the problem of initial liquid inlet. In addition, the SCR metering pump generates a large amount of steam during operation, which can affect its normal operation and cooling if it is not removed in time.

除此之外，现有技术难以做到在完全没有辅助加热情况下在任何气候条件下正常工作。由于现有的提供喷射动力源的装置过于庞大或者其它原因导致不能植入DEF储液罐中，则需要辅助融冰装置，这使得***更加复杂和庞大，成本也居高不下。因此解决***结构复杂的问题是一个现实的迫切问题。In addition to this, it is difficult to work properly in any climatic conditions without any auxiliary heating in the prior art. Since the existing device for providing the jet power source is too bulky or otherwise unable to be implanted in the DEF liquid storage tank, an auxiliary ice melting device is required, which makes the system more complicated and bulky, and the cost is also high. Therefore, solving the problem of complex system structure is a real and urgent problem.

综上，现有技术采用了相当复杂的辅助装置解决SCR喷射计量装置的融冰、冷却和 防止结晶等问题，导致制造和使用成本高，生产和维护难度大等新的问题。In summary, the prior art employs a relatively complicated auxiliary device to solve the melting, cooling and cooling of the SCR jet metering device. Preventing problems such as crystallization, leading to new problems such as high manufacturing and use costs and difficulty in production and maintenance.

发明内容Summary of the invention

本发明针对上述问题，之目的在于提供一种控制精度高，结构简单，安装更换、维修方便的SCR喷射计量***及其控制方法。The present invention is directed to the above problems, and an object thereof is to provide an SCR injection metering system and a control method thereof with high control precision, simple structure, convenient installation and maintenance, and convenient maintenance.

本发明之目的之二在于降低发动机排气后处理液体喷射计量***的成本。Another object of the present invention is to reduce the cost of the engine exhaust aftertreatment liquid injection metering system.

为实现上述目的，本发明采取以下技术方案：To achieve the above object, the present invention adopts the following technical solutions:

一种SCR计量喷射模块，包括一个支架，一个安装在支架一端的脉冲泵，一个固定在支架另一端的上端盖，一个喷嘴和一个控制器，其特征在于：支架从DEF储液罐的上部深入到DEF储液罐的底部，并通过上端盖固定在储液罐上，控制器控制脉冲泵工作，脉冲泵包括螺线管驱动器和柱塞泵，一个轴向贯穿的内流道，工作液(DEF)通过设置在内流道下端入口处的第一过滤器进入到内流道的入口，内流道的出口高于内流道的入口布置，进入内流道的工作液一部分由柱塞泵压送至喷嘴，一部分从内流道的出口排出脉冲泵。An SCR metering injection module includes a bracket, a pulse pump mounted at one end of the bracket, an upper end cap fixed to the other end of the bracket, a nozzle and a controller, wherein the bracket is deep from the upper portion of the DEF reservoir Go to the bottom of the DEF liquid storage tank and fix it on the liquid storage tank through the upper end cover. The controller controls the pulse pump to work. The pulse pump includes a solenoid driver and a plunger pump, an axial through inner flow passage, and a working fluid ( DEF) enters the inlet of the inner flow passage by a first filter disposed at the lower end of the inner flow passage, the outlet of the inner flow passage is arranged higher than the inlet of the inner flow passage, and a part of the working fluid entering the inner flow passage is driven by the plunger pump The pressure is sent to the nozzle, and a part of the pump is discharged from the outlet of the inner flow path.

一种SCR计量喷射模块的控制方法，控制器预存有脉冲泵的特性参数，能够以被动模式(Slave Mode)或主控模式(Master Mode)工作。The control method of the SCR metering injection module, the controller pre-stores the characteristic parameters of the pulse pump, and can work in a slave mode or a master mode.

在被动模式工作时，包括以下步骤，When working in passive mode, the following steps are included,

a)控制器从通讯接口获得目标流量；a) the controller obtains the target traffic from the communication interface;

b)控制器根据目标流量确定计量参数；b) the controller determines the measurement parameter according to the target flow rate;

c)控制器根据包括储液罐内温度和液位的信息确定是否当前状态满足SCR计量模块能够工作的条件；c) the controller determines, based on the information including the temperature and the liquid level in the liquid storage tank, whether the current state satisfies the condition that the SCR metering module can work;

d)如果c)中判断为满足SCR计量模块能够工作的条件，控制器根据计量参数向脉冲泵发送驱动信号；d) if it is determined in c) that the condition that the SCR metering module can work, the controller sends a driving signal to the pulse pump according to the metering parameter;

e)控制器向通信总线发送当前SCR计量模块状态信息。e) The controller sends the current SCR metering module status information to the communication bus.

在主控模式工作时，包括以下步骤，When working in master mode, the following steps are included,

a)控制器从通讯接口和传感器获取信息，根据包括发动机转速、油门位置和排气温度等信息确定目标流量；a) The controller obtains information from the communication interface and the sensor, and determines the target flow rate based on information including engine speed, throttle position, and exhaust temperature;

b)控制器根据NOx传感器或氨气传感器信号反馈修正目标流量；b) the controller corrects the target flow according to the NOx sensor or the ammonia sensor signal feedback;

c)控制器根据目标流量确定计量参数；c) the controller determines the metering parameter according to the target flow rate;

d)控制器根据包括储液罐内温度和液位的信息确定是否当前状态满足SCR计量模块能够工作的条件；d) the controller determines, according to the information including the temperature and the liquid level in the liquid storage tank, whether the current state satisfies the condition that the SCR metering module can work;

e)如果d)中判断为满足SCR计量模块能够工作的条件，控制器根据计量参数向脉冲泵发送驱动信号；e) if it is determined in d) that the SCR metering module can work, the controller sends a driving signal to the pulse pump according to the metering parameter;

f)控制器向通信总线发送当前SCR计量模块以及***状态有关信息。f) The controller sends the current SCR metering module and system status related information to the communication bus.

本发明能够获得的好处是，根据上述技术方案，工作液作为还原发动机的排气中的NOx的还原剂，例如32.5％浓度的尿素水溶液，储存在储液罐中，螺线管柱塞泵的所有电路都可以与工作液绝缘，因此，脉冲泵以及附属的流道和过滤器等，都能够方便地置于储液罐内部，与储液罐共享同一个融冰装置；脉冲泵由控制器电驱动控制工作，可以以主控或者被动模式工作，包括有判断尿素水溶液是否满足不结冰条件的逻辑，从而确定是否需要喷射工作液以及是否处于可喷射工作液的状态；甚至可以判断发动机是否处于高NOx排放工况的逻辑、计算需要多少喷射工作液的逻辑，然后确定驱动脉冲的大小，发出驱动信号，压缩工作液，将其压送至喷嘴，再喷出至发动机的排气管中。这样，泵 出液体量就非常易于控制计量，从而实现对排气中的有害物质NOx的有效净化处理，而且可大幅简化SCR计量喷射***，达到发明目的。The invention can obtain the advantage that, according to the above technical solution, the working fluid is used as a reducing agent for reducing NOx in the exhaust gas of the engine, for example, a 32.5% concentration aqueous urea solution, stored in the liquid storage tank, and the solenoid plunger pump All circuits can be insulated from the working fluid, so the pulse pump and associated flow channels and filters can be conveniently placed inside the reservoir and share the same ice melting device with the reservoir; the pulse pump is controlled by the controller The electric drive control work can work in the master or passive mode, including logic to determine whether the urea aqueous solution satisfies the non-icing condition, thereby determining whether it is necessary to spray the working fluid and whether it is in the state of the sprayable working fluid; In the logic of high NOx emission conditions, calculate the logic of how much liquid to be sprayed, then determine the size of the drive pulse, send a drive signal, compress the working fluid, pump it to the nozzle, and then spray it into the exhaust pipe of the engine. . In this way, the pump The amount of liquid is very easy to control the metering, thereby achieving an effective purification treatment of the harmful substance NOx in the exhaust gas, and greatly simplifying the SCR metering injection system to achieve the object of the invention.

下面的技术方案，对本发明作进一步的限定或优化。The invention is further limited or optimized by the following technical solutions.

所述内流道的出口以能够有效防止固体杂物进入内流道且使DEF能够顺利进入内流道的方式设定；例如，所述内流道的出口可位于邻近DEF储液罐最高空间的位置，出口端可有一段弯道，使其出口方向朝向侧下方，或亦可在出口处设置防止外部物质轻易进入内流道的防护套，从而工作液基本不会到达该处或即使到达也不易进入内流道，但气体则可以排到储液罐的上部空间；或者在内流道的出口处设置第二过滤器，第二过滤器的过滤孔大于等于第一过滤器的过滤孔。The outlet of the inner flow passage is set in such a manner as to effectively prevent solid foreign matter from entering the inner flow passage and enabling the DEF to smoothly enter the inner flow passage; for example, the outlet of the inner flow passage can be located in the highest space adjacent to the DEF liquid storage tank The position of the outlet end may have a curve such that the outlet direction thereof is directed downward to the side, or a protective sleeve for preventing external substances from easily entering the inner flow passage may be provided at the outlet, so that the working fluid does not substantially reach the point or even arrive It is also difficult to enter the inner flow passage, but the gas can be discharged to the upper space of the liquid storage tank; or the second filter is disposed at the outlet of the inner flow passage, and the filter hole of the second filter is greater than or equal to the filter hole of the first filter. .

脉冲泵的工作受内部气体的影响极大，如果工作液因为内部气体无法排出而不能够进入内流道内，那么脉冲泵将无法泵出工作液。内流道内部气体能否顺利排出，取决于液体表面张力决定的内流道空腔边界的冒泡压力。如上方案中，为防止固体杂物进入内流道，在内流道的出口处可以设置防护套或第二过滤器，但如果防护套或第二过滤器的高度位置，相对于泵体能够正常工作的内流道内液体的最低液面位置，两者间因落差形成的液体压力差小于防护套或第二过滤器的冒泡压力时，那么，在液体湿润了防护套或第二过滤器时，内流道中的气体(可能来自于液体蒸发分解或析出，也可能来自于残留在其内部的空气)，将很难排出，形成气泡阻塞。这在工作液用光后重新加液时最容易出现。The operation of the pulse pump is greatly affected by the internal gas. If the working fluid cannot enter the inner flow passage because the internal gas cannot be discharged, the pulse pump will not be able to pump the working fluid. Whether the gas inside the inner channel can be smoothly discharged depends on the bubbling pressure of the inner channel cavity boundary determined by the surface tension of the liquid. In the above scheme, in order to prevent solid foreign matter from entering the inner flow passage, a protective sleeve or a second filter may be disposed at the outlet of the inner flow passage, but if the height position of the protective sleeve or the second filter is normal with respect to the pump body The lowest liquid level of the liquid in the inner flow channel of the working fluid. When the liquid pressure difference formed by the difference between the two is smaller than the bubbling pressure of the protective sleeve or the second filter, then when the liquid wets the protective sleeve or the second filter The gas in the inner flow channel (which may come from the evaporation or precipitation of liquid evaporation, or from the air remaining inside) may be difficult to discharge and form a bubble blockage. This is most likely to occur when the working fluid is refilled after it has been used up.

将第二过滤器的过滤孔设计为大于等于第一过滤器的过滤孔，就会降低第二过滤器的冒泡压力，配合合适的高度落差，就能够防止气泡阻塞。例如，第二过滤器的最大过滤孔直径可以设为0.2-2mm，冒泡压力小于40mm液柱，但第一过滤器的过滤孔因为必须防止损坏脉冲泵的杂物进入，一般都小于0.1mm。Designing the filter hole of the second filter to be larger than or equal to the filter hole of the first filter lowers the bubbling pressure of the second filter, and the bubble trap can be prevented by a suitable height drop. For example, the maximum filter hole diameter of the second filter can be set to 0.2-2 mm, and the bubble pressure is less than 40 mm liquid column, but the filter hole of the first filter is generally less than 0.1 mm because it must prevent the damage of the pulse pump from entering. .

另外，本发明所述内流道贯通螺线管驱动器中的电枢，可以减少电枢往复运动的阻力。因为电枢是将电磁能转换为机械动能的部件，因此其运动阻力严重影响螺线管驱动器的驱动效率，以及脉冲泵的最高工作频率。而其中的工作液产生的压力阻力的大小占其运动阻力的很大部分，电枢横截面积相对于电枢室越小，则电枢的运动阻力就越小。因此电枢中设置轴向贯通的内流道，就可以大幅减少电枢往复运动的阻力。例如一个较优的方案是，在螺线管驱动器的所有横截面中，电枢流道的几何流通面积与电枢几何截面积之比大于0.2。In addition, the inner flow passage of the present invention penetrates the armature in the solenoid driver to reduce the resistance of the armature reciprocating motion. Because the armature is a component that converts electromagnetic energy into mechanical kinetic energy, its motion resistance seriously affects the driving efficiency of the solenoid driver and the maximum operating frequency of the pulse pump. The pressure resistance generated by the working fluid accounts for a large part of the motion resistance. The smaller the armature cross-sectional area is relative to the armature chamber, the smaller the movement resistance of the armature. Therefore, by providing an axially penetrating inner flow passage in the armature, the resistance of the armature reciprocating motion can be greatly reduced. For example, a preferred solution is that the ratio of the geometric flow area of the armature flow path to the geometric cross-sectional area of the armature is greater than 0.2 in all cross-sections of the solenoid driver.

按照上述方案，在电枢的运动阻力变小的同时，还能够形成工作液回流，更有利于排除泵内的析出气体。同时还使脉冲泵的工作频率范围大幅提高，从而提高了SCR计量喷射模块的流量动态范围，拓宽了其可工作条件。本发明所述SCR计量喷射模块，通过控制器控制螺线管的加电参数，例如脉冲宽度、电压、脉冲频率等，可以在相当宽的动态范围内准确定量地调节工作液进入发动机排气管的流量。According to the above scheme, while the movement resistance of the armature becomes small, the working fluid recirculation can be formed, which is more advantageous for eliminating the evolved gas in the pump. At the same time, the operating frequency range of the pulse pump is greatly increased, thereby increasing the dynamic range of the flow of the SCR metering injection module and broadening its working conditions. The SCR metering injection module of the invention controls the solenoid's power-on parameters, such as pulse width, voltage, pulse frequency, etc., to accurately and quantitatively adjust the working fluid into the engine exhaust pipe within a relatively wide dynamic range. Traffic.

本发明所述SCR喷射计量模块，还可包括一个位于脉冲泵外部或者内部，与内流道并联的外流道，外流道有两个接口与内流道连通，如上接口与内流道上部接口连接，下接口与内流道入口连接。外流道上接口以上的外流道和内流道上部接口以上的内流道可以合并为一个流道，作为内流道的一部分。在外流道中串联一个分离腔，所述分离腔具有一定容积空间。进一步，所述分离腔由过滤器内部容积形成。The SCR injection metering module of the present invention may further comprise an outer flow channel located outside or inside the pulse pump and connected in parallel with the inner flow channel. The outer flow channel has two interfaces communicating with the inner flow channel, and the upper interface is connected with the upper channel of the inner flow channel. The lower interface is connected to the inner runner inlet. The outer flow passage above the interface on the outer flow passage and the inner flow passage above the upper interface of the inner flow passage may be combined into one flow passage as a part of the inner flow passage. A separation chamber is connected in series in the outer flow channel, the separation chamber having a certain volume of space. Further, the separation chamber is formed by the internal volume of the filter.

根据上述技术方案，工作液在分离腔中因为重力浮力的作用会分离出气体和液体，气体在上而液体在下，因而进入内流道的工作液将基本不含析出气体。分离出来的气体，会通过外流道的上接口进入内流道内，再通过内流道出口排出到储液罐上部空间，防止 了气泡对脉冲泵工作的不利影响。According to the above technical solution, the working fluid separates the gas and the liquid in the separation chamber due to the action of gravity buoyancy, the gas is above and the liquid is below, so the working fluid entering the inner flow channel will be substantially free of the evolved gas. The separated gas will enter the inner flow passage through the upper interface of the outer flow passage, and then be discharged to the upper space of the liquid storage tank through the inner flow passage outlet to prevent The adverse effects of air bubbles on the operation of the pulse pump.

为了进一步保证这些气体不会聚集以至于影响脉冲泵正常工作，所述外流道和内流道的横截面的最小内切圆直径最好不小于1mm，以使内流道内的气体和液体能够依靠重力浮力作用而自然分离，气体运动到上部并从作为回液通道的内流道的最上方出口排入储液罐上部气体空间，而液体始终趋于充满脉冲泵内部的内流道。In order to further ensure that these gases do not aggregate so as to affect the normal operation of the pulse pump, the minimum inscribed circle diameter of the cross section of the outer flow path and the inner flow path is preferably not less than 1 mm, so that the gas and liquid in the inner flow path can be relied on. The gravity buoyancy acts naturally to separate, and the gas moves to the upper portion and is discharged into the upper gas space of the liquid storage tank from the uppermost outlet of the inner flow passage as the liquid return passage, and the liquid always tends to fill the inner flow passage inside the pulse pump.

再进一步，本发明还包括一个连接脉冲泵和喷嘴的压力管，压力管与喷嘴之间以可拆卸的方式连接。Still further, the present invention also includes a pressure tube connecting the pulse pump and the nozzle, the pressure tube being detachably connected to the nozzle.

该压力管可为一金属或塑料管。由于该压力管的设置，使得脉冲泵和喷嘴的安装布置相对自由方便，特别是对于可任意弯曲变形的压力管，安装更为灵活方便且不会由于振动变形等原因而损坏。The pressure tube can be a metal or plastic tube. Due to the arrangement of the pressure tube, the installation arrangement of the pulse pump and the nozzle is relatively free and convenient, especially for a pressure tube which can be bent and deformed arbitrarily, the installation is more flexible and convenient, and is not damaged due to vibration deformation and the like.

本发明所述的SCR喷射计量模块，还可包括融冰器、液位传感器和温度传感器，其中，融冰器可为一个以发动机冷却液为介质的加热管回路，加热管回路可由金属或者塑料管制成，液位传感器的电路和温度传感器被封装在同一个导管内，所述导管可以为一个塑料管，融冰器和导管沿支架上下布置。所述脉冲泵也可以固定在所述融冰器和(或者)导管上，融冰器和(或者)导管可以替代支架；所述融冰器还可为一个电加热器。无论是依靠发动机冷却液还是电能工作的融冰器，都可以由控制器控制其工作，例如，可以在融冰器加热管回路中串联一个电磁阀以控制融冰器的工作。The SCR injection metering module of the present invention may further comprise an ice melting device, a liquid level sensor and a temperature sensor, wherein the ice melting device may be a heating pipe circuit using an engine coolant as a medium, and the heating pipe circuit may be metal or plastic. The tube is fabricated, the circuit of the level sensor and the temperature sensor are packaged in the same conduit, the conduit can be a plastic tube, and the ice melter and the conduit are arranged one above the other. The pulse pump can also be attached to the ice melter and/or conduit, and the ice melter and/or conduit can be used in place of the stent; the ice melter can also be an electric heater. Whether it is an ice melter that relies on engine coolant or electrical energy, it can be controlled by the controller. For example, a solenoid valve can be connected in series with the ice-melting heater circuit to control the operation of the ice-melting device.

根据上述技术方案，SCR喷射计量模块可以作为一个总成安装在储液罐上，外部简洁整齐。在环境温度低于-11℃时，DEF液体就会结冰，这时需要在发动机启动后，随着冷却液温度上升，脉冲泵周围的冰开始融化，当判断液态DEF达到一定量时，脉冲泵就可以工作。在这种条件下，为了能够尽快满足脉冲泵的工作条件，可以采取以下加速措施：1)融冰器围绕脉冲泵布置，2)采用电加热融冰器或者电融冰器辅助加热，3)给脉冲泵的螺线管加入一个安全电流，让脉冲泵自我加热。According to the above technical solution, the SCR injection metering module can be installed as an assembly on the liquid storage tank, and the exterior is simple and tidy. When the ambient temperature is lower than -11 °C, the DEF liquid will freeze. At this time, after the engine is started, as the temperature of the coolant rises, the ice around the pulse pump begins to melt. When the liquid DEF is judged to be a certain amount, the pulse is pulsed. The pump will work. Under such conditions, in order to be able to meet the working conditions of the pulse pump as quickly as possible, the following acceleration measures can be taken: 1) the ice melting device is arranged around the pulse pump, 2) the electric heating ice melting device or the electric melting ice device is used for auxiliary heating, 3) Add a safe current to the solenoid of the pulse pump to allow the pulse pump to self-heat.

本发明所述的SCR喷射计量模块，所述喷嘴可以为一个依靠压力开启的喷嘴，工作液的喷射计量通过控制脉冲泵实现；所述喷嘴也可以为一个靠电磁力开启的喷嘴，工作液的喷射计量可以通过控制脉冲泵和喷嘴实现，脉冲泵和喷嘴以同步的方式工作。In the SCR injection metering module of the present invention, the nozzle may be a nozzle that is opened by pressure, and the injection metering of the working fluid is realized by controlling the pulse pump; the nozzle may also be a nozzle that is opened by electromagnetic force, and the working fluid Injection metering can be achieved by controlling the pulse pump and the nozzle, which operates in a synchronized manner.

进一步，本发明所述的SCR喷射计量模块，还包括一个气液混合腔，置于储液罐内，或者固定在支架之上端盖上。在气液混合腔置于储液罐内的方案中，喷嘴可以与脉冲泵集成在一起。气液混合腔一端连接一个压缩空气源，另一端通过一个输送管连接喷射器，喷射器固定在发动机排气管上，所述喷嘴将工作液喷入气液混合腔，工作液在气液混合腔中与压缩空气混合并通过喷射器喷入发动机排气管中。在混合腔和压缩空气源之间串联一个电磁阀，在所述SCR喷射计量模块停止工作之后，压缩空气滞后关闭，以确保输送管和喷射器中没有残留工作液。Further, the SCR injection metering module of the present invention further comprises a gas-liquid mixing chamber placed in the liquid storage tank or fixed on the upper end cover of the bracket. In the solution where the gas-liquid mixing chamber is placed in the reservoir, the nozzle can be integrated with the pulse pump. One end of the gas-liquid mixing chamber is connected to a source of compressed air, and the other end is connected to the injector through a conveying pipe. The injector is fixed on the exhaust pipe of the engine. The nozzle sprays the working fluid into the gas-liquid mixing chamber, and the working fluid is mixed in the gas-liquid mixture. The chamber is mixed with compressed air and injected into the engine exhaust through an injector. A solenoid valve is connected in series between the mixing chamber and the source of compressed air. After the SCR injection metering module is stopped, the compressed air is hysterically closed to ensure that no working fluid remains in the delivery tube and injector.

根据上述技术方案，SCR喷射计量模块通过所述喷嘴喷出的工作液喷雾，进一步在气液混合腔中与压缩空气混合雾化，然后喷入发动机排气管，因此，依靠压缩空气气动雾化液体的原理，工作液的雾化液滴会进一步减小，进入发动机排气中更有利于和排气混合反应。同时，因为气液混合腔以及工作液喷嘴可以远离高温的排气管，所以工作条件优越，可靠性易于得到保证。再者，由于电磁阀的作用，压缩空气滞后关闭将不会在所述输送管及喷射器中残留工作液，也就排除了工作液在其中结晶或结冰堵塞输送管管路和喷射器的可能，这部分管路也就不需要融冰装置。特别是对于气液混合腔置于储液罐内的方案，甚至可以不用专门设计融冰装置，而只需要在有结冰的条件下，预先给脉冲泵的电磁线圈加上超长的驱动脉冲，通过电磁线圈发热热量来融冰。这将使SCR*** 更加简洁，成本更低。According to the above technical solution, the SCR spray metering module sprays the working fluid sprayed by the nozzle, further mixes and atomizes with the compressed air in the gas-liquid mixing chamber, and then sprays into the engine exhaust pipe, thereby relying on the pneumatic atomization of the compressed air. The principle of liquid, the atomized droplets of the working fluid will be further reduced, and entering the engine exhaust is more conducive to the mixed reaction with the exhaust. At the same time, because the gas-liquid mixing chamber and the working fluid nozzle can be kept away from the high-temperature exhaust pipe, the working conditions are superior and the reliability is easily ensured. Moreover, due to the action of the solenoid valve, the compressed air hysteresis will not leave the working fluid in the conveying pipe and the injector, thereby eliminating the crystallization or freezing of the working fluid therein to block the conveying pipe line and the injector. Possibly, this part of the pipeline does not require an ice melting device. Especially for the scheme that the gas-liquid mixing chamber is placed in the liquid storage tank, it is not necessary to specifically design the ice melting device, and it is only necessary to add an excessive driving pulse to the electromagnetic coil of the pulse pump in advance under the condition of icing. The ice is heated by the heat generated by the electromagnetic coil. This will make the SCR system More concise and lower cost.

本发明所述的SCR喷射计量模块，所述喷嘴也可以固定在发动机排气管上，压力管从支架之上端盖穿过到达喷嘴，工作液通过喷嘴喷入发动机排气管中。或者压力管分成两段，处于储液罐内的第一段压力管在储液罐内部与处于支架之上端盖的压力管接头的一端连接，外部延长的第二段压力管在储液罐外部与支架之上端盖上的压力管接头的另一端连接，并将工作液引接入固定在发动机排气管上的喷嘴。In the SCR injection metering module of the present invention, the nozzle may also be fixed on the engine exhaust pipe, and the pressure pipe passes from the upper end cover of the bracket to the reaching nozzle, and the working fluid is sprayed into the engine exhaust pipe through the nozzle. Or the pressure pipe is divided into two sections, and the first section of the pressure pipe in the liquid storage tank is connected inside the liquid storage tank to one end of the pressure pipe joint at the upper end cover of the support, and the externally extended second pressure pipe is outside the liquid storage tank It is connected to the other end of the pressure pipe joint on the upper end cover of the bracket, and guides the working fluid to the nozzle fixed on the exhaust pipe of the engine.

上述技术方案中，进一步在所述支架之上端盖和喷嘴之间，可沿压力管布置电加热装置，当控制器根据环境温度判断工作液可能结冰时，将启动电加热装置进行融冰。In the above technical solution, an electric heating device may be disposed along the pressure tube between the end cover and the nozzle above the bracket. When the controller determines that the working fluid may freeze according to the ambient temperature, the electric heating device is activated to perform ice melting.

上述技术方案，通过提升阀喷嘴或旋流喷嘴的压力喷射直接雾化工作液，喷射到发动机排气中，不需要使用压缩空气来雾化工作液或者扫除管道内残留工作液，是一种无压缩空气模式(Air-free Mode)，因此可大幅简化SCR***。The above technical solution directly injects the working fluid through the pressure injection of the poppet nozzle or the swirling nozzle, and injects into the exhaust of the engine, does not need to use compressed air to atomize the working fluid or sweep the residual working fluid in the pipeline, which is a kind of no Air-free mode, which greatly simplifies the SCR system.

或者，在压力管中串联一个三通接头，三通接头之第三支管接头通过一个电磁阀接入一个压缩空气源，控制器判断满足喷射结束逻辑后，将开启所述电磁阀，用压缩空气扫除残留在从三通至喷嘴之间的工作液。三通可以布置在上端盖附近，也可以布置在尽可能靠近脉冲泵的压力管入口处。Alternatively, a three-way joint is connected in series in the pressure pipe, and the third pipe joint of the three-way joint is connected to a compressed air source through a solenoid valve. After the controller judges that the injection end logic is satisfied, the solenoid valve is opened, and the compressed air is used. Sweep the working fluid remaining between the tee and the nozzle. The tee can be placed near the upper end cap or at the inlet of the pressure tube as close as possible to the pulse pump.

上述所有技术方案中，储液罐内的工作液都可以通过一个加热装置来保证融冰，加热装置布置在所述脉冲泵及其附属的工作液管路附近。所述加热装置可以为电加热装置，也可以为引入发动机冷却液的换热器。In all the above technical solutions, the working fluid in the liquid storage tank can be ensured to be melted by a heating device, and the heating device is arranged near the pulse pump and its associated working fluid pipeline. The heating device may be an electric heating device or a heat exchanger that introduces engine coolant.

本发明所述的SCR喷射计量模块，所述控制器包括单片机，脉冲泵驱动电路，传感器信号处理电路，CAN总线数据收发器；控制器预存有脉冲泵的特性参数，计量参数与标准流量的二维数据，标准流量对应标准电压和标准温度的流量，控制器同时预存有电压和温度对流量的修正系数。In the SCR injection metering module of the present invention, the controller comprises a single chip microcomputer, a pulse pump driving circuit, a sensor signal processing circuit, a CAN bus data transceiver; the controller prestores a characteristic parameter of the pulse pump, and the measurement parameter and the standard flow rate Dimensional data, the standard flow corresponds to the flow of standard voltage and standard temperature, and the controller pre-stores the correction coefficient of voltage and temperature to flow.

进一步，本发明所述控制器还可包括一个蓝牙模块，可以通过该蓝牙模块与外界智能设备交换数据。利用该蓝牙功能，可以将控制器内部数据，以及通过CAN获得的发动机管理***ECU的数据，记录或实时无线传出到外界智能设备，例如智能手机或者智能手表等，进而通过互联网传到任何网址，从而实现车辆以及SCR***的数据的实时分享，有助于诊断维修车辆、SCR***，或者监控车辆的排放数据。Further, the controller of the present invention may further comprise a Bluetooth module through which data can be exchanged with the external smart device. With this Bluetooth function, the internal data of the controller and the data of the engine management system ECU obtained through CAN can be recorded or real-time wirelessly transmitted to external smart devices, such as smart phones or smart watches, and then transmitted to any website via the Internet. In order to realize real-time sharing of data of vehicles and SCR systems, it is helpful to diagnose maintenance vehicles, SCR systems, or monitor vehicle emissions data.

本发明所述SCR喷射计量模块以被动的方式工作的优点在于，所有以降低发动机NOx排放的控制逻辑储存在车辆的后处理控制单元ACU(after-treatment control unit)中，ACU可以是一个独立的单元，也可以集成在发动机管理***的控制单元ECU(electronic control unit)中，这样，车辆可以根据需要灵活地选择SCR喷射计量模块，不需要对ACU做任何改动。本发明所述的SCR喷射计量模块只是ACU的一个执行器。ACU根据NOx排放后处理逻辑，计算得到需要提供SCR工作液的流量后，将该目标流量通过CAN总线下传，SCR喷射计量模块从CAN总线获得目标流量后，按照上述工作模式执行计量喷射。另外，在这种情况下，ACU还可以统一管理包括另一个与排放后处理相关的喷射***DDS(diesel dosing system),DDS主要用于DPF(diesel particulate filter)再生***，以降低整个后处理解决方案的成本。The advantage of the SCR injection metering module of the present invention operating in a passive manner is that all control logic to reduce engine NOx emissions is stored in the vehicle's after-treatment control unit (ACU), which may be an independent The unit can also be integrated in the ECU (electronic control unit) of the engine management system, so that the vehicle can flexibly select the SCR injection metering module as needed without any modification to the ACU. The SCR injection metering module of the present invention is only one actuator of the ACU. The ACU calculates the flow rate required to provide the SCR working fluid according to the post-NOx processing logic, and then transmits the target flow rate through the CAN bus. After the SCR injection metering module obtains the target flow rate from the CAN bus, the metering injection is performed according to the above working mode. In addition, in this case, the ACU can also manage the DDS (diesel dosing system), which is related to the post-discharge treatment. The DDS is mainly used in the DPF (diesel particulate filter) regeneration system to reduce the overall post-processing solution. The cost of the program.

本发明所述的SCR喷射计量模块以主控模式工作的优点在于，发动机ECU可以不含有发动机后处理控制逻辑，所述SCR喷射计量模块的控制器将直接采集或者通过CAN总线获得发动机转速、油门位置、NOx传感器或氨气浓度、排气温度或者催化转化器温度、储液罐温度、工作液液面位置等参数，然后根据内部的计算逻辑确定需要喷射的工作液流量，并输出驱动脉冲泵信号，完成工作液的喷射。 The advantage of the SCR injection metering module of the present invention operating in the master control mode is that the engine ECU may not include engine aftertreatment control logic, and the controller of the SCR injection metering module will directly acquire or obtain engine speed and throttle through the CAN bus. Position, NOx sensor or ammonia concentration, exhaust gas temperature or catalytic converter temperature, reservoir temperature, working fluid level, etc., and then determine the flow rate of the working fluid to be injected according to internal calculation logic, and output the drive pulse pump Signal to complete the injection of the working fluid.

在所述控制器采集排气温度或者催化转化器温度、储液罐内温度和工作液液面位置时，所述控制器如果发现排气温度或者催化转化器温度或者储液罐温度或者工作液位低于各自所定值时，控制器将不发送工作液喷射信号，而给CAN总线发出SCR喷射计量模块非正常状态信息，包括出现非正常状态的原因，可以包括NOx传感器或氨气浓度、排气温度或者催化转化器温度、储液罐温度，工作液位等具体参数值。当然，即使SCR喷射计量模块处于正常状态，也可以发送SCR喷射计量模块正常的状态信息，以及各个具体参数值。The controller if the exhaust gas temperature or the catalytic converter temperature or the liquid storage tank temperature or the working fluid is found when the controller collects the exhaust gas temperature or the catalytic converter temperature, the liquid storage tank temperature, and the working fluid liquid level position. When the bit is lower than the specified value, the controller will not send the working fluid injection signal, but send the CAN bus the abnormal status information of the SCR injection metering module, including the cause of the abnormal state, which may include the NOx sensor or ammonia concentration, row Specific parameters such as gas temperature or catalytic converter temperature, reservoir temperature, working fluid level, etc. Of course, even if the SCR injection metering module is in a normal state, the normal state information of the SCR injection metering module, as well as the specific parameter values, can be transmitted.

下面结合附图和具体实施方式对本发明做进一步详细描述。The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

附图说明DRAWINGS

图1为本发明提供的SCR喷射计量模块之第一实施例示意图。1 is a schematic view of a first embodiment of an SCR injection metering module provided by the present invention.

图2为本发明提供的SCR喷射计量模块之第二实施例示意图。2 is a schematic view of a second embodiment of an SCR injection metering module provided by the present invention.

图3为本发明提供的SCR喷射计量模块之第三实施例示意图。3 is a schematic view of a third embodiment of an SCR injection metering module provided by the present invention.

图4为本发明提供的SCR喷射计量模块之第四实施例示意图。4 is a schematic view of a fourth embodiment of an SCR injection metering module provided by the present invention.

图5为本发明提供的SCR喷射计量模块之第五实施例示意图。FIG. 5 is a schematic diagram of a fifth embodiment of an SCR injection metering module provided by the present invention.

图6为本发明提供的SCR喷射计量模块之被动工作模式应用实例图。FIG. 6 is a diagram showing an application example of a passive working mode of an SCR injection metering module provided by the present invention.

图7为本发明提供的SCR喷射计量模块之主控工作模式应用实例图。FIG. 7 is a diagram showing an application example of a main control working mode of an SCR injection metering module provided by the present invention.

图8为本发明提供的SCR喷射计量模块之无压缩空气工作模式应用实例图。FIG. 8 is a diagram showing an application example of an uncompressed air operation mode of the SCR injection metering module provided by the present invention.

图9为本发明提供的SCR喷射计量模块之脉冲泵之一的结构示意图。FIG. 9 is a schematic structural view of one of the pulse pumps of the SCR injection metering module provided by the present invention.

图10为本发明提供的SCR喷射计量模块之脉冲泵之二的结构示意图。FIG. 10 is a schematic structural view of a second pulse pump of an SCR injection metering module according to the present invention.

图11为本发明提供的SCR喷射计量模块之脉冲泵之三的结构示意图。FIG. 11 is a schematic structural view of a third pulse pump of the SCR injection metering module provided by the present invention.

图12为本发明提供的SCR喷射计量模块之脉冲泵之四的结构示意图。12 is a schematic structural view of a fourth pulse pump of the SCR injection metering module provided by the present invention.

图13为本发明提供的SCR喷射计量模块之两种喷嘴总成示意图。Figure 13 is a schematic view of two nozzle assemblies of the SCR injection metering module provided by the present invention.

图14为本发明提供的SCR喷射计量模块之一种自开式喷嘴结构示意图。14 is a schematic view showing the structure of a self-opening nozzle of the SCR injection metering module provided by the present invention.

图15为本发明提供的SCR喷射计量模块之第二种自开式喷嘴结构示意图。FIG. 15 is a schematic structural view of a second self-opening nozzle of the SCR injection metering module provided by the present invention.

图16为本发明提供的SCR喷射计量模块以被动模式工作时的控制器信号输入输出内容示例图。16 is a diagram showing an example of controller signal input and output contents when the SCR injection metering module is operated in a passive mode according to the present invention.

图17为本发明提供的SCR喷射计量模块以主控模式工作时的控制器信号输入输出内容示例图。FIG. 17 is a diagram showing an example of controller signal input and output contents when the SCR injection metering module provided in the main control mode is provided by the present invention.

图18为本发明提供的SCR喷射计量模块之控制器以被动模式工作的逻辑过程图。Figure 18 is a logic process diagram of the controller of the SCR injection metering module operating in a passive mode.

图19为本发明提供的SCR喷射计量模块之控制器以主控模式工作的逻辑过程图。FIG. 19 is a logic process diagram of the controller of the SCR injection metering module provided in the master control mode according to the present invention.

具体实施例Specific embodiment

如图1所示，为本发明提供的SCR计量喷射模块之第一实施例结构示意图，包括脉冲泵1，支架7，喷嘴18，气液混合腔16，控制器9，上端盖8，输送管10，过滤调压阀11，压缩空气控制电磁阀12，压缩空气管13。所述脉冲泵1与上端盖8分别安装于支架7的两端，脉冲泵1在支架7的最下端，与支架7通过螺纹3固定连接为一体。上端盖8固定在支架7的上端，两者可以为一个整体。支架7还安装有电加热融冰器6、液位传感器4和温度传感器5。控制器9安装于上端盖8上，位于支架7上的各电气连接线，包括脉冲泵驱动电缆线、电加热驱动电缆线、传感器信号电缆线等，直接引出到上端盖8连接至控制器9上，例如通过液位传感器4的内部管道引出。所述喷嘴18直接安装于脉冲泵1的输出口。所述气液混合腔16上设有进气嘴16a和输送管10的连接 嘴16b，其底部开口16c密封套装于脉冲泵1之上，将喷嘴18包围其中，喷嘴18将工作液喷入混合腔16内。进气嘴16a与压缩空气管13连接，将压缩空气引入混合腔16内，与工作液在混合腔16内部混合，然后一起通过输送管10进入发动机排气管(图1中未示出)。脉冲泵1上还装置有一个回流管15，其出口15a处于较高位置，在出口15a处设置有第二过滤网或保护套14。As shown in FIG. 1 , a schematic structural view of a first embodiment of an SCR metering injection module provided by the present invention includes a pulse pump 1 , a bracket 7 , a nozzle 18 , a gas-liquid mixing chamber 16 , a controller 9 , an upper end cover 8 , and a conveying tube 10. The pressure regulating valve 11, the compressed air control solenoid valve 12, and the compressed air tube 13. The pulse pump 1 and the upper end cover 8 are respectively mounted on the two ends of the bracket 7, and the pulse pump 1 is fixedly connected to the bracket 7 through the thread 3 at the lowermost end of the bracket 7. The upper end cap 8 is fixed to the upper end of the bracket 7, and the two may be one unitary. The bracket 7 is also equipped with an electric heating ice melting device 6, a liquid level sensor 4, and a temperature sensor 5. The controller 9 is mounted on the upper end cover 8. The electrical connection lines on the bracket 7 include a pulse pump drive cable, an electric heating drive cable, a sensor signal cable, etc., and are directly led out to the upper cover 8 to be connected to the controller 9. The upper part is taken out, for example, by an internal pipe of the liquid level sensor 4. The nozzle 18 is directly mounted to the output of the pulse pump 1. The gas-liquid mixing chamber 16 is provided with a connection of the inlet nozzle 16a and the delivery tube 10. The mouth 16b has a bottom opening 16c that is sealed over the pulse pump 1 and surrounds the nozzle 18, which sprays the working fluid into the mixing chamber 16. The intake nozzle 16a is connected to the compressed air tube 13, introduces compressed air into the mixing chamber 16, mixes with the working fluid inside the mixing chamber 16, and then passes through the delivery tube 10 together into the engine exhaust pipe (not shown in Fig. 1). The pulse pump 1 is also provided with a return line 15 with its outlet 15a in a higher position and a second filter or protective sleeve 14 at the outlet 15a.

所述SCR计量喷射模块直接***SCR***的储液罐中，通过上端盖8固定在SCR***的储液罐上。因为压缩空气可以清洗气液混合腔16及输送管10等，所以可以保证喷嘴18开始的下游管道空间内没有残留工作液，包括混合腔16以及输送管10等，也就解决了因为DEF结冰或者结晶堵塞SCR工作管道的问题。另一方面，脉冲泵1可以通过控制器9的长时间大脉冲加电产生热量，也就可以融化脉冲泵1和喷嘴16内部的结冰，因此该实施例甚至可以取消电加热融冰器6。The SCR metering injection module is directly inserted into the liquid storage tank of the SCR system and fixed to the liquid storage tank of the SCR system through the upper end cover 8. Since the compressed air can clean the gas-liquid mixing chamber 16 and the conveying pipe 10, etc., it can be ensured that there is no residual working fluid in the downstream piping space where the nozzle 18 starts, including the mixing chamber 16 and the conveying pipe 10, etc., and the DEF is frozen. Or crystallize the problem of plugging the SCR working pipe. On the other hand, the pulse pump 1 can generate heat by the long-time large pulse energization of the controller 9, that is, the icing of the pulse pump 1 and the inside of the nozzle 16 can be melted, so that the embodiment can even cancel the electric heating ice blaster 6 .

图1提供的SCR计量喷射模块之脉冲泵之一实例如图9所示。所述脉冲泵1包括一个螺线管驱动器23，一个柱塞泵22，一个过滤器2，一个轴向贯穿的内流道21，一个与内流道21并联的外流道20，外流道20兼做分离腔28，上部为回液嘴20c。泵内工作液在内流道21中的流动方向直接从下至上。图1中的回流管15连接在回液嘴20c上，作为内流道21的延长部分。所述内流道21包含有工作液入口21a和上部接口21b以及电枢室21c，贯穿电枢24的两端，上部接口21b高于内流道21的入口21a布置。内流道21与外流道20通过接口20a和20b连通。过滤器2安装在内流道21的入口21a处。An example of a pulse pump of the SCR metering injection module provided in Figure 1 is shown in Figure 9. The pulse pump 1 comprises a solenoid driver 23, a plunger pump 22, a filter 2, an axially extending inner flow passage 21, an outer flow passage 20 connected in parallel with the inner flow passage 21, and an outer flow passage 20 The separation chamber 28 is formed, and the upper portion is the liquid return nozzle 20c. The flow of the working fluid in the pump in the inner flow passage 21 is directly from bottom to top. The return pipe 15 in Fig. 1 is attached to the liquid return nozzle 20c as an extension of the inner flow path 21. The inner flow path 21 includes a working fluid inlet 21a and an upper port 21b, and an armature chamber 21c, which penetrates both ends of the armature 24, and the upper port 21b is disposed higher than the inlet 21a of the inner channel 21. The inner flow path 21 and the outer flow path 20 communicate through the interfaces 20a and 20b. The filter 2 is installed at the inlet 21a of the inner flow path 21.

图1所示实施例及图9所示脉冲泵工作过程如下：The working process of the pulse pump shown in the embodiment shown in Fig. 1 and Fig. 9 is as follows:

工作液通过设置在内流道21下端入口21a处的过滤器2，经内流道21流入柱塞泵22内。所述螺线管驱动器23通过电接插口19与控制器9电气连接，螺线管驱动器23通电后，将驱动电枢24向上运动，电枢24又推动柱塞25向上运动，压缩压力室27内的工作液，因此出液阀29打开，高压的工作液进入高压通道31及喷嘴18，工作液压力大于喷嘴18的开启压力时，喷嘴18就打开，将工作液喷入气液混合腔16之中。螺线管驱动器23断电后，电枢24和柱塞25将在柱塞回位弹簧的作用下开始向下运动回位，压力室27内的压力降低，出液阀弹簧推动出液阀29关闭，当柱塞25回位到吸液孔27a再次打开时，新的工作液将通过吸液孔27a进入压力室27，完成一个工作循环。在控制器9给螺线管驱动器23不断施加PWM驱动脉冲时，就不断地将工作液喷入气液混合腔16之中。控制器9同时还控制压缩空气控制电磁阀12的开关，从而压缩空气进入气液混合腔16，形成空气和工作液的气雾混合流，经过输送管10进入发动机排气管净化NOx。The working fluid flows into the plunger pump 22 through the inner flow passage 21 through the filter 2 disposed at the lower end inlet 21a of the inner flow passage 21. The solenoid driver 23 is electrically connected to the controller 9 through the electrical socket 19, and after the solenoid driver 23 is energized, the driving armature 24 is moved upward, and the armature 24 pushes the plunger 25 upward again to compress the pressure chamber 27. The working fluid inside, so that the liquid discharge valve 29 is opened, the high pressure working fluid enters the high pressure passage 31 and the nozzle 18, and when the working fluid pressure is greater than the opening pressure of the nozzle 18, the nozzle 18 is opened, and the working fluid is sprayed into the gas-liquid mixing chamber 16 Among them. After the solenoid driver 23 is de-energized, the armature 24 and the plunger 25 will start to move downwards under the action of the plunger return spring, the pressure in the pressure chamber 27 is lowered, and the outlet valve spring pushes the outlet valve 29 When the plunger 25 is returned to the liquid suction hole 27a to be opened again, the new working fluid will enter the pressure chamber 27 through the liquid suction hole 27a to complete a duty cycle. When the controller 9 continuously applies the PWM drive pulse to the solenoid driver 23, the working fluid is continuously injected into the gas-liquid mixing chamber 16. The controller 9 also controls the switch of the compressed air control solenoid valve 12 so that the compressed air enters the gas-liquid mixing chamber 16 to form an aerosol mixed flow of air and working fluid, which enters the engine exhaust pipe through the delivery pipe 10 to purify NOx.

如上工作过程中，工作液通过过滤器2进入到内流道21和外流道20，一部分进一步进入柱塞泵22的压力室27，一部分可能通过上部接口21b和接口20a回流到外流道20。分离腔28作为外流道20的一部分，具有一定的容积空间，可以用于实现气液分离，让进液中的气泡移动到外流道20的上部。During the above operation, the working fluid enters the inner flow passage 21 and the outer flow passage 20 through the filter 2, and a portion further enters the pressure chamber 27 of the plunger pump 22, and a portion thereof may flow back to the outer flow passage 20 through the upper interface 21b and the interface 20a. The separation chamber 28, as part of the outer flow passage 20, has a certain volume of space and can be used to achieve gas-liquid separation, allowing the bubbles in the incoming liquid to move to the upper portion of the outer flow passage 20.

脉冲泵1在工作时，需要工作液尽可能充满其内部，并且必须尽可能防止液体以外的杂物进入脉冲泵1的内部，因为杂物可能损坏脉冲泵1。另一方面，还必须让脉冲泵1的内部气体自然排出，防止出现气阻。这些功能通过过滤器2、内流道21、外流道20和回流管15、第二过滤网或保护套14来实现。所述回流管15与上端回液嘴20c连通。工作液主要通过过滤器2进入脉冲泵1的内部空间，偶尔也会有工作液通过第二过滤器或保护套14进入脉冲泵1的内部空间，从而保证了工作液中的杂物不能进入脉冲泵1。脉冲泵1工作时，内部可能会析出气体，在脉冲泵1压缩内部工作液的同时，一部分工作液会形成回流流入外流道20，这些气体会和回流液体一起进入回流管15，并且可能 通过回流管15的上部出口15a和第二过滤器(保护套)14排出到脉冲泵1的外部空间。如此，气泡也就难以在脉冲泵1内部聚集。由于设计回流管15的出口15a在较高部位，第二过滤器(防护套)14的透气孔径比过滤器2的过滤孔径要大，其冒泡压力低于回流管总高度H能够形成的落差压力，因此即使液位突然加到淹过第二过滤器(防护套)14，脉冲泵内的气体也能够自然排出，保证脉冲泵1内部不会气阻。进一步，回流管15内径要足够大，例如大于1mm，最好大于6mm，从而能够使工作液和气泡在其中自然分离，气泡总会处于上面，液体总会处于下面，防止回流管15中存在液柱而削弱脉冲泵1内部气体的排出动力。When the pulse pump 1 is in operation, it is required that the working fluid fills the inside as much as possible, and it is necessary to prevent impurities other than the liquid from entering the inside of the pulse pump 1 as much as possible, since the debris may damage the pulse pump 1. On the other hand, it is also necessary to naturally discharge the internal gas of the pulse pump 1 to prevent the occurrence of air resistance. These functions are achieved by the filter 2, the inner flow passage 21, the outer flow passage 20 and the return conduit 15, the second filter mesh or the protective sleeve 14. The return pipe 15 is in communication with the upper liquid return nozzle 20c. The working fluid mainly enters the inner space of the pulse pump 1 through the filter 2, and occasionally the working fluid enters the inner space of the pulse pump 1 through the second filter or the protective sleeve 14, thereby ensuring that the impurities in the working fluid cannot enter the pulse. Pump 1. When the pulse pump 1 is in operation, gas may be evolved inside. When the pulse pump 1 compresses the internal working fluid, a part of the working fluid will flow back into the outer flow passage 20, and these gases will enter the return pipe 15 together with the return liquid, and may The upper outlet 15a of the return pipe 15 and the second filter (protective cover) 14 are discharged to the outer space of the pulse pump 1. Thus, bubbles are difficult to collect inside the pulse pump 1. Since the outlet 15a of the design return pipe 15 is at a higher position, the venting aperture of the second filter (protective cover) 14 is larger than the filter aperture of the filter 2, and the bubble pressure is lower than the total height H of the return pipe. The pressure, therefore, even if the liquid level is suddenly added to the second filter (protective cover) 14, the gas in the pulse pump can be naturally discharged, ensuring that the inside of the pulse pump 1 does not have air resistance. Further, the inner diameter of the return pipe 15 is sufficiently large, for example, greater than 1 mm, preferably greater than 6 mm, so that the working fluid and the bubbles are naturally separated therein, the bubbles are always on the top, and the liquid is always underneath, preventing the liquid from being present in the return pipe 15. The column weakens the discharge power of the gas inside the pulse pump 1.

此外，柱塞上可以设置一个单向阀26，例如鸭嘴式单向阀，当压力室27内部压力小于电枢室21c内的压力时，液体会通过单向阀26进入压力室27，从而减小柱塞22回位时的阻力，并防止压力室气阻，还能够提高脉冲泵1的最高工作频率。In addition, a one-way valve 26 may be disposed on the plunger, such as a duckbill type one-way valve. When the internal pressure of the pressure chamber 27 is lower than the pressure in the armature chamber 21c, the liquid enters the pressure chamber 27 through the check valve 26, thereby The resistance at the time of returning the plunger 22 is reduced, and the air chamber resistance is prevented, and the maximum operating frequency of the pulse pump 1 can also be increased.

图2所示为本发明提供的SCR计量喷射模块之第二实施例结构示意图，包括支架7，脉冲泵35，喷嘴18，压力管39，冷却液回路36，气液混合腔16，控制器9，上端盖8，过滤调压阀11，压缩空气控制电磁阀12。气液混合腔16安装于上端盖8上部。脉冲泵35可以采用图10、图11或图12所示结构。脉冲泵35位于支架7的下端，与喷嘴18通过压力管39连接，该压力管39可为一能够任意弯曲而弹性或塑性变形的金属或塑料管，可以根据需要任意改变脉冲泵35和喷嘴18之间的相对位置和距离，压力管39两端设有快速插接连接头或者螺纹连接头37、38，可拆卸更换。发动机冷却液回路36在这里就是融冰器，并与所述支架7合二为一，即两者固定连接在一起，或为同一个部件。在发动机运转后，冷却液温度上升，从而自动加热融化结成冰的工作液。所述脉冲泵35通过安装片41与冷却液回路36暨支架7固定。所述喷嘴18如图14或图13b所示，为一个压力驱动自开式喷嘴，包含一个安装环18b(图13b中未示出)，可通过安装片40固定于上端盖8上，其喷孔18a深入至气液混合腔16内。所述气液混合腔16包含一个进气口17和一个混合气雾出口16a，进气口17与压缩空气控制电磁阀12连接，混合气雾出口16a通过输送管10与固定于排气管62上的喷射器64连接(见图6)。2 is a schematic structural view of a second embodiment of an SCR metering injection module according to the present invention, including a bracket 7, a pulse pump 35, a nozzle 18, a pressure tube 39, a coolant circuit 36, a gas-liquid mixing chamber 16, and a controller 9. The upper end cap 8 filters the pressure regulating valve 11 and compresses the air control solenoid valve 12. The gas-liquid mixing chamber 16 is attached to the upper portion of the upper end cap 8. The pulse pump 35 can adopt the structure shown in Fig. 10, Fig. 11, or Fig. 12. The pulse pump 35 is located at the lower end of the bracket 7 and is connected to the nozzle 18 through a pressure tube 39. The pressure tube 39 can be a metal or plastic tube that can be flexibly or plastically deformed by any bending. The pulse pump 35 and the nozzle 18 can be arbitrarily changed as needed. Between the relative positions and distances, the pressure tube 39 is provided with quick-connecting connectors or threaded connectors 37, 38 at both ends for detachable replacement. The engine coolant circuit 36 is here an ice blaster and is integrated with the bracket 7 so that the two are fixedly connected together or are the same component. After the engine is running, the temperature of the coolant rises, thereby automatically heating the working fluid that melts into ice. The pulse pump 35 is fixed to the coolant circuit 36 and the bracket 7 via the mounting piece 41. The nozzle 18 is a pressure-driven self-opening nozzle as shown in FIG. 14 or FIG. 13b, and includes a mounting ring 18b (not shown in FIG. 13b) which can be fixed to the upper end cover 8 by the mounting piece 40. The hole 18a penetrates into the gas-liquid mixing chamber 16. The gas-liquid mixing chamber 16 includes an air inlet 17 and a mixed gas mist outlet 16a. The air inlet 17 is connected to the compressed air control solenoid valve 12, and the mixed gas mist outlet 16a is fixed to the exhaust pipe 62 through the conveying pipe 10. The upper injector 64 is connected (see Figure 6).

图2的示例中，脉冲泵35的高压部分在下部，而低压部分在上部，这与图1中的脉冲泵1正好相反，但内流道中的低压工作液的流动方向仍然是从下到上。不过脉冲泵35也可以如图10的脉冲泵35a所示，为高压部分在上部，而低压部分在下部的结构形式。In the example of Fig. 2, the high pressure portion of the pulse pump 35 is at the lower portion and the low pressure portion is at the upper portion, which is exactly the opposite of the pulse pump 1 of Fig. 1, but the flow direction of the low pressure working fluid in the inner flow passage is still from bottom to top. . However, the pulse pump 35 can also be of the configuration shown in the pulse pump 35a of Fig. 10, in which the high pressure portion is at the upper portion and the low pressure portion is at the lower portion.

图2所示实施例提供的SCR计量喷射模块之脉冲泵35还可为如图11所示的脉冲泵35b，或者如图12所示的脉冲泵35c。包括图10的脉冲泵35a在内，这些脉冲泵与图1及图10所示的脉冲泵1的明显不同点在于：高压通道31上不直接连接喷嘴18，而是通过输出接嘴45连接压力管39。压力管39将高压通道31延长，从而使气液混合腔16和喷嘴18可以布置在上端盖8之上部。压力管39将高压工作液引入喷嘴18。The pulse pump 35 of the SCR metering injection module provided by the embodiment shown in Fig. 2 may also be a pulse pump 35b as shown in Fig. 11, or a pulse pump 35c as shown in Fig. 12. The pulse pump including the pulse pump 35a of FIG. 10 is significantly different from the pulse pump 1 shown in FIGS. 1 and 10 in that the high pressure passage 31 is not directly connected to the nozzle 18, but is connected to the pressure through the output nozzle 45. Tube 39. The pressure tube 39 extends the high pressure passage 31 so that the gas-liquid mixing chamber 16 and the nozzle 18 can be disposed above the upper end cap 8. The pressure tube 39 introduces the high pressure working fluid into the nozzle 18.

图11所示脉冲泵35b与图1及图10所示的脉冲泵1的区别还有，没有设置外流道，柱塞22的运动方向相反，即柱塞22在螺线管驱动器23的驱动下向下运动时压缩压力室27内的工作液，而回位时柱塞22向上运动，这时向压力室27吸入新鲜工作液。此外，吸液单向阀47设置在吸液孔27a的下方、压力室27的侧壁上，单向吸液孔47a在柱塞22向上运动回位时，提前打开吸入新鲜工作液，同样起到防止压力室气阻并减小柱塞22回位阻力的作用。因为两个吸液孔27a和47a都处于内流道21的下方，因此即使没有外流道，仍然能够保证通过过滤器2的工作液基本以液体形态进入压力室27，脉冲泵35b内部的气体都会在内流道21中与液体分离流向出口21b，防止气阻现象的发生。 回流管15(图2)将连接在内流道出口接嘴21d上，作为内流道21的延伸。这样，脉冲泵35b成为一种结构非常简洁的脉冲泵。The pulse pump 35b shown in Fig. 11 differs from the pulse pump 1 shown in Figs. 1 and 10 in that the outer flow path is not provided, and the movement direction of the plunger 22 is reversed, that is, the plunger 22 is driven by the solenoid driver 23. The working fluid in the pressure chamber 27 is compressed during the downward movement, and the plunger 22 is moved upward when the position is returned, at which time the fresh working fluid is sucked into the pressure chamber 27. Further, the liquid suction check valve 47 is disposed below the liquid suction hole 27a and on the side wall of the pressure chamber 27, and the one-way liquid suction hole 47a is opened in advance to suck in the fresh working fluid when the plunger 22 is moved upward. To prevent the air pressure of the pressure chamber and reduce the resistance of the plunger 22 returning. Since both of the liquid suction holes 27a and 47a are located below the inner flow path 21, even if there is no outer flow path, it is ensured that the working fluid passing through the filter 2 enters the pressure chamber 27 substantially in a liquid form, and the gas inside the pulse pump 35b will be The flow in the inner flow path 21 is separated from the liquid to the outlet 21b to prevent the occurrence of a gas barrier phenomenon. The return pipe 15 (Fig. 2) will be connected to the inner flow path outlet nozzle 21d as an extension of the inner flow path 21. Thus, the pulse pump 35b becomes a pulse pump of a very simple structure.

图11所示脉冲泵35b只要将压力管接嘴45改变为喷嘴18的安装结构，并把喷嘴18、气液混合腔16安装在脉冲泵的下方，输送管10仍然连接气液混合腔16的连接嘴，就可以构成如图1所示的本发明提供的SCR计量喷射模块之另一个更为简洁的实施例。The pulse pump 35b shown in Fig. 11 only needs to change the pressure tube nozzle 45 to the mounting structure of the nozzle 18, and install the nozzle 18 and the gas-liquid mixing chamber 16 below the pulse pump, and the delivery tube 10 is still connected to the gas-liquid mixing chamber 16. By connecting the mouth, another more compact embodiment of the SCR metering jet module of the present invention as shown in Figure 1 can be constructed.

图12所示脉冲泵35c与图11所示脉冲泵35b的区别在于，脉冲泵35c外部包含一个管接外流道48，外流道的上端口48a与内流道出口附近接口21e连接，外流道的下端口48b与安装于内流道21入口之过滤器2相连，外流道48及过滤器2内部具有足够大的空腔，可以分离进入过滤器2的工作液中的气体。这样更有利于排出脉冲泵35c内部气体。The pulse pump 35c shown in Fig. 12 differs from the pulse pump 35b shown in Fig. 11 in that the pulse pump 35c includes a tube outer flow passage 48 outside, and the upper port 48a of the outer flow passage is connected to the interface 21e near the inner flow passage outlet, and the outer flow passage is connected. The lower port 48b is connected to the filter 2 installed at the inlet of the inner flow passage 21, and the outer flow passage 48 and the inside of the filter 2 have a sufficiently large cavity to separate the gas entering the working fluid of the filter 2. This is more advantageous for discharging the gas inside the pulse pump 35c.

图3为本发明提供的SCR计量喷射模块之第三实施例结构示意图。与本发明提供的第二实施例结构示意图之区别之一在于：所述脉冲泵35之回流管15出口端15a位于上端盖下的较高位置并带有一个折弯圆弧段，使回流管的出口朝向侧下面，以有效防止固体杂物进入内流道且使DEF能够顺利进入内流道内。与本发明提供的第二实施例结构示意图之区别之二在于：本结构中所述控制器9单独安装，但线缆要通过上端盖8接入脉冲泵35及各传感器等。与本发明提供的第二实施例结构示意图之区别之三在于：所述压力管39连接的喷嘴50为一个需要控制器9控制打开关闭的喷射阀，如图13中的图13a所示，可以为普通车用汽油机所用的气道喷射喷嘴阀。所述控制器9在输出脉冲驱动脉冲泵35的同时，也要输出一个驱动脉冲给喷嘴50，喷出工作液的计量受脉冲泵35驱动脉冲和喷嘴50驱动脉冲两者的影响。3 is a schematic structural view of a third embodiment of an SCR metering injection module provided by the present invention. One of the differences from the structural schematic of the second embodiment provided by the present invention is that the outlet end 15a of the return pipe 15 of the pulse pump 35 is located at a higher position under the upper end cover and has a bent arc segment to make the return pipe The outlet is directed to the side below to effectively prevent solid debris from entering the inner flow passage and enabling the DEF to smoothly enter the inner flow passage. The second difference from the structural schematic diagram of the second embodiment provided by the present invention is that the controller 9 is separately installed in the present structure, but the cable is connected to the pulse pump 35, the sensors, and the like through the upper end cover 8. The third difference from the structural schematic diagram of the second embodiment provided by the present invention is that the nozzle 50 connected to the pressure tube 39 is an injection valve that requires the controller 9 to control the opening and closing, as shown in FIG. 13a in FIG. It is an airway injection nozzle valve used in a gasoline engine for general vehicles. The controller 9 also outputs a drive pulse to the nozzle 50 while outputting the pulse drive pulse pump 35. The metering of the discharge fluid is affected by both the pulse pump 35 drive pulse and the nozzle 50 drive pulse.

图4为本发明的第四个实施例的示意图。与本发明提供的第二实施例之区别在于，不设置气液混合腔，模块向发动机排气管喷射纯工作液液体，但为了防止结冰堵塞喷射管道，将压力管39分为两段，即压力管39a和压力管39b，在支架7之上端盖8上，设有一个三通管接头51，连接压力管39a和压力管39b，连接方式为螺纹或快速接插连接头。压力管39b另一端通过螺纹连接头53与喷嘴54连接，喷嘴54直接安装在发动机排气管(图4中未示出)之上。三通管接头51的第三个管接头接入由电磁阀12控制的压缩空气。在SCR***正常工作期间，电磁阀12一直关闭，不会有压缩空气流入压力管39b。当发动机停车或者，发动机长时间处于非NOx排放工况工作，即SCR***较长时间不喷射工作液，那么控制器9给压缩空气控制电磁阀12发送一定时长的打开驱动信号，以清除管道以及喷嘴中的残余工作液，达到除冰及防结晶的目的。Figure 4 is a schematic view of a fourth embodiment of the present invention. The difference from the second embodiment provided by the present invention is that the module does not provide a gas-liquid mixing chamber, and the module injects pure working fluid into the engine exhaust pipe, but in order to prevent the ice from blocking the injection pipe, the pressure pipe 39 is divided into two sections. That is, the pressure pipe 39a and the pressure pipe 39b are provided on the end cover 8 of the bracket 7, and a three-way pipe joint 51 is provided for connecting the pressure pipe 39a and the pressure pipe 39b in a threaded or quick-connecting joint. The other end of the pressure tube 39b is connected to the nozzle 54 via a screw joint 53 which is directly mounted on the engine exhaust pipe (not shown in Fig. 4). The third pipe joint of the tee fitting 51 is connected to the compressed air controlled by the solenoid valve 12. During normal operation of the SCR system, the solenoid valve 12 is always closed and no compressed air flows into the pressure tube 39b. When the engine is stopped or the engine is in a non-NOx discharge condition for a long time, that is, the SCR system does not spray the working fluid for a long time, the controller 9 sends a compressed driving signal to the compressed air control solenoid valve 12 for a certain period of time to clear the pipeline and The residual working fluid in the nozzle achieves the purpose of deicing and preventing crystallization.

所述喷嘴54也是压力控制的自开式喷嘴，但其开启压力小于压缩空气的压力。喷嘴54可选用如图13b和图15所示喷嘴，特别是图15所示提升阀喷嘴对液体的雾化效果好，并且液体在空间分布范围广，尤其适合于诸如本发明实施例四和下述的实施例五的液体直接喷入发动机排气管的场合。The nozzle 54 is also a pressure controlled self-opening nozzle, but its opening pressure is less than the pressure of the compressed air. The nozzle 54 can be selected from the nozzles shown in FIG. 13b and FIG. 15, in particular, the lift valve nozzle shown in FIG. 15 has a good atomization effect on the liquid, and the liquid has a wide spatial distribution range, and is particularly suitable for the fourth and lower embodiments of the present invention. The liquid of the fifth embodiment is directly injected into the exhaust pipe of the engine.

图5为本发明提供的SCR计量喷射模块的第五个实施例的示意图。与上述第四结构示意图大致相同，其主要区别在于：压力管39a与压力管39b通过一个两通接头连接，压力管39b上分布有电加热装置55，并由控制器9控制其在环境温度过低时，在发动机启动预热阶段给压力管39b融冰，而压力管39a的融冰问题由SCR计量喷射模块上集成的融冰装置例如冷却液回路36解决。这样，SCR***就完全不需要压缩空气了，特别适用于某些压缩空气来源受限的车辆。Figure 5 is a schematic illustration of a fifth embodiment of an SCR metering injection module provided by the present invention. The main difference is the same as the above-mentioned fourth structural diagram. The main difference is that the pressure pipe 39a and the pressure pipe 39b are connected by a two-way joint, and the electric heating device 55 is distributed on the pressure pipe 39b, and is controlled by the controller 9 at ambient temperature. When low, the pressure tube 39b is melted during the engine start preheating phase, and the ice melting problem of the pressure tube 39a is resolved by an ice melting device, such as a coolant circuit 36, integrated on the SCR metering injection module. In this way, the SCR system does not require compressed air at all, and is especially suitable for certain vehicles with limited compressed air sources.

本发明提供的SCR计量喷射模块之脉冲泵之工作过程皆基本相同。The working process of the pulse pump of the SCR metering injection module provided by the invention is basically the same.

图6所示为本发明提供的SCR计量喷射模块以被动模式应用于发动机NOx排放后处 理的***示例，本发明的SCR计量喷射模块60从储液罐(DEF罐)61上部的开口装入储液罐61，并通过上端盖8固定在储液罐61上。发动机排气管道62上安装有排气温度传感器63、喷射器64，催化转换器65、NOx传感器66及其专用数据处理器66b，传感器(63、66)以及喷射器64通过安装螺纹(63a、64a、66a)固定于排气管62上。排气温度传感器63可安装于喷射器64之前靠近喷射器64处，但最好安装于催化转换器65之上，以提供更可靠的信息，用于判断催化转换器65是否处于起燃状态。SCR计量模块60之支架7的下端固定着脉冲泵35，其深入到DEF储液罐61的底部，储液罐61中存储有选择还原发动机排气中NOx的还原剂，例如32.5％的尿素水溶液(DEF)，从而使储液罐61中的DEF能够用尽。Figure 6 shows the SCR metering injection module provided by the present invention in a passive mode applied to the engine after NOx emissions As an example of the system, the SCR metering injection module 60 of the present invention is loaded into the liquid storage tank 61 from the opening in the upper portion of the liquid storage tank (DEF tank) 61, and is fixed to the liquid storage tank 61 through the upper end cover 8. An exhaust gas temperature sensor 63, an ejector 64, a catalytic converter 65, a NOx sensor 66 and its dedicated data processor 66b, the sensors (63, 66) and the ejector 64 are mounted on the engine exhaust duct 62 by mounting threads (63a, 64a, 66a) are fixed to the exhaust pipe 62. The exhaust temperature sensor 63 may be mounted adjacent to the injector 64 prior to the injector 64, but is preferably mounted above the catalytic converter 65 to provide more reliable information for determining whether the catalytic converter 65 is in a light-off state. The lower end of the bracket 7 of the SCR metering module 60 is fixed with a pulse pump 35 which penetrates to the bottom of the DEF liquid storage tank 61. The liquid storage tank 61 stores a reducing agent for selectively reducing NOx in the exhaust gas of the engine, for example, a 32.5% aqueous urea solution. (DEF), so that the DEF in the liquid storage tank 61 can be used up.

在SCR计量喷射模块以被动模式工作时，发动机或者车辆主控制单元(ECU)或者其中的排气后处理控制单元(ACU)67将与SCR计量模块60之控制器9之间通过通信总线(CAN)交换数据，主控制单元ECU控制发动机及车辆运行，甚至控制排放后处理***，ACU专门控制排放后处理***，但无论是ECU还是ACU，都会通过排气温度传感器63、NOx传感器66(专用信号处理器66b)等获得实时的排气温度和NOx浓度，根据车辆的NOx排放工况及目标和其内部逻辑，确定一个SCR***的DEF目标流量，然后通过CAN总线给控制器9下传具体的DEF喷射指令。控制器9获取DEF目标流量及喷射指令后，按照目标流量以及内部预存的脉冲泵35特性参数、修正系数等计算出工作液喷射计量参数，并判断是否满足工作液喷射条件，例如融冰是否完成、储液罐61中液位是否足够等，如果满足喷射条件，则发出喷射驱动脉冲给脉冲泵35，同时也发出电磁阀的驱动信号，如果不满足条件，则不发出喷射驱动脉冲给脉冲泵35，同时向CAN总线发送一个SCR计量模块处于不可工作状态的信息。脉冲泵35在驱动脉冲的作用下，将压缩泵内的工作液，一部分被压送到压力管39，通过喷嘴18定量喷射到气液混合腔16中，而电磁阀12在驱动信号的作用下也处于打开状态，压缩空气也喷入气液混合腔16中，工作液在气液混合腔16中与压缩空气混合，然后进入输送管10再到达喷射器64，由喷射器64喷入发动机排气管62中，并且与排气混合并蒸发热解成氨气，与发动机排气一同进入NOx催化还原转换器65。在催化转换器65中NOx和氨气反应，被催化还原为无害的N2、H2O等。在SCR喷射计量模块停止工作之后，控制器9将控制电磁阀12继续保持打开一段时间，使压缩空气供应给气液混合腔滞后停止，从而确保输送管10和喷射器64中没有残留工作液，也就不会出现结冰堵塞。When the SCR metering injection module is operating in the passive mode, the engine or vehicle main control unit (ECU) or the exhaust aftertreatment control unit (ACU) 67 therein will communicate with the controller 9 of the SCR metering module 60 via the communication bus (CAN) Exchange data, the main control unit ECU controls the engine and vehicle operation, and even controls the exhaust aftertreatment system. The ACU specializes in controlling the exhaust aftertreatment system, but both the ECU and the ACU pass the exhaust temperature sensor 63 and the NOx sensor 66 (dedicated signal) The processor 66b) obtains the real-time exhaust temperature and NOx concentration, determines the DEF target flow of an SCR system according to the NOx emission condition and the target of the vehicle and its internal logic, and then transmits the specific to the controller 9 through the CAN bus. DEF injection command. After acquiring the DEF target flow rate and the injection command, the controller 9 calculates the working fluid injection measurement parameter according to the target flow rate and the internal pre-stored pulse pump 35 characteristic parameter, the correction coefficient, etc., and determines whether the working fluid injection condition is satisfied, for example, whether the melting ice is completed. Whether the liquid level in the liquid storage tank 61 is sufficient, etc., if the injection condition is satisfied, the injection drive pulse is sent to the pulse pump 35, and the drive signal of the electromagnetic valve is also issued. If the condition is not satisfied, the injection drive pulse is not issued to the pulse pump. 35. Simultaneously send an information to the CAN bus that the SCR metering module is in an inoperable state. The pulse pump 35, under the action of the driving pulse, partially presses the working fluid in the compression pump to the pressure tube 39, and quantitatively injects it into the gas-liquid mixing chamber 16 through the nozzle 18, and the solenoid valve 12 is under the action of the driving signal. Also in the open state, compressed air is also injected into the gas-liquid mixing chamber 16, the working fluid is mixed with the compressed air in the gas-liquid mixing chamber 16, and then enters the delivery tube 10 and reaches the injector 64, which is injected into the engine row by the injector 64. The gas pipe 62 is mixed with the exhaust gas and evaporated to pyrolysis into ammonia gas, and enters the NOx catalytic reduction converter 65 together with the engine exhaust. In the catalytic converter 65, NOx reacts with ammonia gas, and is catalytically reduced to harmless N2, H2O, and the like. After the SCR injection metering module is stopped, the controller 9 keeps the control solenoid valve 12 open for a period of time, so that the supply of compressed air to the gas-liquid mixing chamber is delayed, thereby ensuring that no working fluid remains in the delivery tube 10 and the injector 64. There will be no icing blockage.

图16更明确地说明了SCR计量模块控制器9在被动模式(Slave Mode)下，与排气后处理控制单元(ACU)67之间的关系。线缆中包括了接入整个***CAN总线的连接线，以及通过各个传感器测量SCR***状态的输入线，还有驱动脉冲泵、压缩空气控制电磁阀和电加热器等的输出控制线。控制器9中，包括单片机，数据存储器，脉冲泵驱动电路，传感器信号处理电路，CAN总线数据收发器；控制器9接受ACU下传目标流量，进一步根据数据存储器中预存的脉冲泵的特性参数、计量参数与标准流量的二维数据、电压和温度对流量的修正系数等，来确定脉冲泵的驱动脉宽，以及判断当前SCR计量模块是否处于可工作状态等，如果处于可工作状态，则发出脉冲泵的驱动指令，如果处于不可工作状态，则不发送脉冲泵的驱动指令。无论什么状态，都要通过CAN总线上传液位温度、执行器状态，特别是SCR计量模块工作状态等信息。Figure 16 more clearly illustrates the relationship between the SCR metering module controller 9 and the exhaust aftertreatment control unit (ACU) 67 in a slave mode. The cable includes a connection line that connects to the CAN bus of the entire system, an input line that measures the state of the SCR system through various sensors, and an output control line that drives a pulse pump, a compressed air control solenoid valve, and an electric heater. The controller 9 includes a single chip microcomputer, a data memory, a pulse pump driving circuit, a sensor signal processing circuit, and a CAN bus data transceiver; the controller 9 accepts the ACU to transmit the target flow, and further according to the characteristic parameters of the pulse pump prestored in the data memory, The two-dimensional data of the measurement parameters and the standard flow, the correction coefficient of the voltage and the temperature to the flow, etc., to determine the driving pulse width of the pulse pump, and to determine whether the current SCR metering module is in a working state, etc., if it is in a working state, then issue The drive command of the pulse pump does not send the drive command of the pulse pump if it is in an inoperable state. Regardless of the status, the liquid level temperature, actuator status, and especially the working status of the SCR metering module must be uploaded via the CAN bus.

图18为控制器9以被动模式(Slave Mode)工作时的内部主要处理步骤逻辑图，适用于要使用压缩空气清洗管路并且有气液混合腔的***，如实施例1到实施例3。上电(步骤101)后，首先将压缩空气控制电磁阀开启滞后关闭的延长开启目标时间设为 0(步骤102)，这是因为开机后刚开始是不需要压缩空气的。在步骤103，控制器9已经与发动机控制器10建立了通信关系，立即从CAN总线上读取排气后处理控制单元67下传的有关数据，必须包括SCR工作液目标流量和发动机转速，然后立即判断发动机是否已经启动(步骤104)，如果没有启动，发动机转速＝0，则转入步骤105，计算延迟时间，因为当前延时目标时间为0，所以在步骤106判断的结果肯定为延时已到，进入步骤107关闭压缩空气控制电磁阀，然后又将延时目标复零，转回步骤103。如果在步骤104发现发动机已经启动，则将转入步骤109，判断发动机控制器是否没有要求一个大于0的SCR工作液目标流量，即目标流量是否为0，如果是，则说明还没有开始或者已经要求停止SCR***工作，则进入步骤120，将喷射计量参数置为0；如果否，则说明要求SCR***工作，进入步骤110根据目标流量计算喷射参数。在完成步骤110或者120后，先要检查SCR***是否处于可工作状态，即进入步骤111。在步骤111，判断工作液温度是否保证没有结冰？如果工作液温度大于预设的保证没有结冰的临界温度，则进入步骤113判断储液罐内工作液液位是否足够高允许SCR***工作。如果步骤111判断为否，则说明可能DEF有结冰，还不能开始让SCR***工作，立即进入步骤112，开启除冰电加热器(如果有的话)，然后在步骤114确定因为DEF有结冰而SCR***不能工作的状态码。在步骤113如果判断为否，则说明DEF液位太低不能开始让SCR***工作，立即进入步骤114确定因为DEF液位问题而SCR***不能工作的状态码。如果步骤111和113判断都为是，并且确定DEF喷射计量参数不为0，则将确定的喷射计量参数对应的脉冲泵驱动信号输出给脉冲泵(步骤115)，然后发出压缩空气控制电磁阀打开(已经打开则保持)信号(步骤117)，并确定新的压缩空气控制电磁阀滞后关闭的延长开启目标时间(步骤118)，同时让延迟计数器复零，确定SCR模块可以正常工作的状态码。完成了步骤114或者118后，都进入步骤116，向CAN总线发送SCR***状态码以及DEF液位、DEF温度等信息，最后返回步骤103继续。Figure 18 is a logic diagram of the internal main processing steps when the controller 9 is operating in a slave mode, suitable for systems that use compressed air purge lines and have gas-liquid mixing chambers, as in Examples 1 through 3. After power-on (step 101), first set the extended opening target time of the compressed air control solenoid valve to open the hysteresis off 0 (step 102), this is because compressed air is not required at the beginning of the boot. At step 103, the controller 9 has established a communication relationship with the engine controller 10, and immediately reads the relevant data transmitted from the exhaust post-processing control unit 67 from the CAN bus, which must include the SCR working fluid target flow rate and the engine speed, and then Immediately judge whether the engine has started (step 104). If the engine speed is not started, then go to step 105 to calculate the delay time. Since the current delay target time is 0, the result judged in step 106 is definitely a delay. Upon arrival, the process proceeds to step 107 where the compressed air control solenoid valve is closed, and then the delay target is reset to zero and the process returns to step 103. If it is found in step 104 that the engine has started, then it will proceed to step 109 to determine if the engine controller does not require a target flow rate of SCR working fluid greater than 0, that is, whether the target flow rate is 0, and if so, it indicates that it has not started or has already If it is required to stop the SCR system operation, then step 120 is entered to set the injection metering parameter to 0; if not, the SCR system is required to operate, and step 110 is entered to calculate the injection parameters based on the target flow rate. After completing step 110 or 120, it is first checked whether the SCR system is in an operable state, that is, the process proceeds to step 111. At step 111, it is determined whether the temperature of the working fluid is guaranteed to be free of ice. If the working fluid temperature is greater than a predetermined critical temperature that is guaranteed to be free of ice, then step 113 is entered to determine if the working fluid level in the reservoir is sufficiently high to allow the SCR system to operate. If the determination in step 111 is no, it indicates that the DEF may be frozen, and the SCR system may not be started to work. Immediately proceed to step 112 to turn on the deicing electric heater (if any), and then at step 114, it is determined that the DEF has a knot. The status code that the ice and the SCR system cannot work. If the determination at step 113 is no, then the DEF level is too low to begin operating the SCR system, and immediately proceeds to step 114 to determine the status code for the SCR system to be inoperable due to DEF level problems. If both of steps 111 and 113 determine YES, and it is determined that the DEF injection measurement parameter is not 0, the pulse pump drive signal corresponding to the determined injection measurement parameter is output to the pulse pump (step 115), and then the compressed air control solenoid valve is opened. The signal (already held) is asserted (step 117) and a new open air control solenoid valve is determined to lag the extended open target time (step 118), while the delay counter is reset to zero to determine the status code that the SCR module can operate normally. After step 114 or 118 is completed, the process proceeds to step 116, and the SCR system status code, the DEF liquid level, the DEF temperature and the like are sent to the CAN bus, and finally returns to step 103 to continue.

在步骤110，将根据预存在控制器的数据存储器中的计量参数(喷射参数)与标准流量关系的二维数据、以及电压和温度对流量的修正系数等，确定实现目标流量的最准确计量参数。At step 110, the most accurate measurement parameter for achieving the target flow rate is determined according to the two-dimensional data of the measurement parameter (injection parameter) in the data memory pre-existing in the controller and the standard flow rate, and the correction coefficient of the voltage and temperature to the flow rate, and the like. .

在步骤114和118，控制器要确定一个状态码明确表示SCR模块及***的当前工作状态，例如下表实例：At steps 114 and 118, the controller determines that a status code clearly indicates the current operating state of the SCR module and system, such as the following table:

SCR模块状态码SCR module status code	含义meaning
		000000	无异常，正常喷射DEFNo abnormality, normal injection DEF
001001	无异常，但没有喷射DEFNo abnormality, but no DEF injection
		010010	发动机排气温度不够，没有喷射DEFEngine exhaust temperature is not enough, no DEF injection
011011	DEF液位不够，不能喷射DEFDEF liquid level is not enough, can not spray DEF
		100100	DEF温度不够，可能有结冰，不能喷射DEFDEF temperature is not enough, there may be ice, can not spray DEF

对于DEF液体直接喷射到发动机排气管的实施例4，图18所示过程步骤稍有不同，即需要判断何时打开压缩空气控制阀，而压缩空气控制阀打开的持续时间可以为一个预先设计好的确定值。在发动机启动后，一般情况下，压缩空气控制阀都处于关闭状态，只有在SCR***较长时间没有喷射DEF或者发动机停机后，才发出打开压缩空气控制阀进行扫气的启动信号。具体过程省略。For the embodiment 4 in which the DEF liquid is directly injected into the engine exhaust pipe, the process steps shown in Fig. 18 are slightly different, that is, it is necessary to judge when the compressed air control valve is opened, and the duration of the opening of the compressed air control valve can be a pre-design Good value. After the engine is started, the compressed air control valve is normally closed. Only after the SCR system has not injected DEF for a long time or the engine is stopped, the activation signal for opening the compressed air control valve for scavenging is issued. The specific process is omitted.

图7为本发明提供的SCR计量喷射模块以主控模式应用于发动机NOx排放处理的系 统示例。***构成等基本与图6所示的应用例相同，只是控制器9采集SCR***的所有传感器信号，包括排气温度传感器63、NOx传感器66(专用数据处理器66b)的输出信号，而且不从主控制器(ECU)67读取流量目标数据。Figure 7 is a system for applying the SCR metering injection module of the present invention to the engine NOx emission treatment in the main control mode. Example. The system configuration and the like are basically the same as the application example shown in FIG. 6, except that the controller 9 collects all the sensor signals of the SCR system, including the output signals of the exhaust temperature sensor 63, the NOx sensor 66 (dedicated data processor 66b), and does not The main controller (ECU) 67 reads the flow target data.

在主控模式下，控制器9将根据获得的各种数据，包括通过CAN总线获得的发动机转速、油门位置，以及从各传感器测得的数据，自主计算出DEF喷射目标流量。其后的处理过程与被动模式完全相同。In the master mode, the controller 9 will automatically calculate the DEF injection target flow rate based on various data obtained, including engine speed, throttle position obtained through the CAN bus, and data measured from each sensor. Subsequent processing is exactly the same as passive mode.

图17更加明确地说明了主控模式下，主控制单元(ECU)与SCR控制器9之间的关系和各自的主要功能。这里主控制单元为没有SCR控制功能的发动机控制单元(ECU)90，主控制单元90只通过ECU数据总线下传发动机转速和发动机油门位置(负荷信号)数据，SCR控制器9检测液位、储液罐温度、发动机排气温度等传感器的输出信号，并上传到CAN总线。另外NOx或氨气传感器信号有专门的信号处理器直接将传感器信号数据上传到CAN总线。Figure 17 more clearly illustrates the relationship between the main control unit (ECU) and the SCR controller 9 and their respective main functions in the master mode. Here, the main control unit is an engine control unit (ECU) 90 having no SCR control function, and the main control unit 90 transmits engine speed and engine throttle position (load signal) data only through the ECU data bus, and the SCR controller 9 detects the liquid level and stores The output signal of the sensor such as tank temperature and engine exhaust temperature is uploaded to the CAN bus. In addition, the NOx or ammonia sensor signal has a dedicated signal processor that directly uploads the sensor signal data to the CAN bus.

图19为控制器9以主控模式工作时的内部主要处理步骤逻辑图。与图17的不同主要在于，增加了步骤200，并且在步骤103，除了发动机转速外，还必须从CAN总线获取发动机负荷(油门位置)参数以及其他发动机运行条件参数，例如冷却液温度等(如果这些参数都由发动机控制单元90处理)。NOx或氨气排放浓度参数一般有专用数据处理器直接上传到CAN总线。当然如果SCR模块控制器直接输入各传感器的信号，就不用从CAN总线读取。在步骤200，最关键的计算是SCR工作液目标流量的确定，其中，首先根据转速、油门位置和排气温度查表确定一个基本SCR工作液目标流量(这些表格数据预存在控制器的数据存储器中，其中包含一些非NOx处理工况，例如排气温度明显低于SCR触媒的可工作温度，或者负荷太小NOx生成浓度很低，等等)，然后根据当前实测的NOx或氨气排放浓度进行反馈修正得到最终目标流量。Figure 19 is a logic diagram of the internal main processing steps when the controller 9 is operating in the master mode. The difference from FIG. 17 is mainly that step 200 is added, and in step 103, in addition to the engine speed, engine load (throttle position) parameters and other engine operating condition parameters, such as coolant temperature, etc., must be obtained from the CAN bus (if These parameters are all processed by the engine control unit 90). NOx or ammonia emission concentration parameters are typically uploaded directly to the CAN bus by a dedicated data processor. Of course, if the SCR module controller directly inputs the signals of the sensors, it does not need to read from the CAN bus. At step 200, the most critical calculation is the determination of the SCR working fluid target flow, wherein a basic SCR working fluid target flow is first determined based on the rotational speed, throttle position, and exhaust temperature look-up tables (these table data are pre-stored in the controller's data store) Medium, including some non-NOx treatment conditions, such as the exhaust gas temperature is significantly lower than the working temperature of the SCR catalyst, or the load is too small, the NOx production concentration is very low, etc.), and then according to the current measured NOx or ammonia emission concentration Perform feedback correction to get the final target flow.

图19的其他的步骤与图18的被动模式的步骤相同。The other steps of FIG. 19 are the same as those of the passive mode of FIG.

图8所示为以本发明提供的无压缩空气SCR计量喷射模块为核心的SCR***应用例示意图，计量喷射模块70可以采用图5所示实施例的结构，并且以主控模式工作，图中省略了发动机主控单元。带外部电加热装置71的压力管72通过两通接头73及连接螺纹接头72a把液态的高压工作液引向喷嘴74，电加热装置71由控制器9控制，以保证外部管道温度不会导致压力管72内的DEF结冰，并在可能结冰的条件下融冰。而计量喷射模块70内部的压力管39的除冰则由循环冷却液换热装置完成。计量喷射模块70通过DEF罐(储液罐)61的上部开口***储液罐61并固定在其上。喷嘴74安装在发动机排气管62上，与压力管72通过螺纹接头72b相连接。排气温度传感器63，催化转换器65，NOx传感器66都安装在发动机排气管62上。喷嘴74的详细结构可以如图15所示，为压力开启外开式提升阀喷嘴，通过安装凸台75固定于排气管道上，在脉冲泵35的驱动下，DEF被脉冲式从储液罐61中泵入压力管39和72，压力波的作用也使喷嘴74的内部压力脉冲式增加减小，在脉冲压力大于喷嘴74的开启压力时，从喷嘴74就喷射出中空型工作液喷雾，工作液喷雾流入发动机排气管的主方向与排气方向呈锐角，因此能够与发动机排气以较好的混合状态进入催化转换器65，净化排气中的NOx，生成无害的N2和H2O等。FIG. 8 is a schematic diagram showing an application example of an SCR system with a compressed air SCR metering injection module provided by the present invention. The metering injection module 70 can adopt the structure of the embodiment shown in FIG. 5 and operates in a master control mode. The engine main control unit is omitted. The pressure tube 72 with the external electric heating device 71 leads the liquid high-pressure working fluid to the nozzle 74 through the two-way joint 73 and the connecting screw joint 72a, and the electric heating device 71 is controlled by the controller 9 to ensure that the external pipe temperature does not cause pressure. The DEF in tube 72 freezes and melts under conditions that may freeze. The deicing of the pressure pipe 39 inside the metering injection module 70 is completed by the circulating coolant heat exchange device. The metering injection module 70 is inserted into the liquid storage tank 61 through the upper opening of the DEF tank (liquid storage tank) 61 and fixed thereto. The nozzle 74 is mounted on the engine exhaust pipe 62 and is connected to the pressure pipe 72 via a threaded joint 72b. The exhaust temperature sensor 63, the catalytic converter 65, and the NOx sensor 66 are all mounted on the engine exhaust pipe 62. The detailed structure of the nozzle 74 can be as shown in FIG. 15, which is a pressure-opening open-opening poppet nozzle, which is fixed to the exhaust duct by a mounting boss 75. Under the driving of the pulse pump 35, the DEF is pulsed from the liquid storage tank. 61 is pumped into the pressure pipes 39 and 72, and the action of the pressure wave also causes the internal pressure pulse type of the nozzle 74 to be increased. When the pulse pressure is greater than the opening pressure of the nozzle 74, the hollow working fluid spray is ejected from the nozzle 74. The main direction of the working fluid spray flowing into the engine exhaust pipe is at an acute angle to the exhaust direction, so that it can enter the catalytic converter 65 with the engine exhaust gas in a better mixed state, purifying the NOx in the exhaust gas, and generating harmless N2 and H2O. Wait.

图8所示***不需要使用压缩空气来保证DEF喷射***可靠工作，特别适用于压缩空气来源受限的场合，例如小型柴油卡车的SCR***。The system shown in Figure 8 does not require the use of compressed air to ensure reliable operation of the DEF injection system, and is particularly suitable for applications where compressed air sources are limited, such as SCR systems for small diesel trucks.

上述事例仅仅用于说明本发明，但并不限制本发明，凡基于本发明精神实质的进一步的改变方案均属本发明公开和保护的范围。 The above examples are merely illustrative of the invention, but are not intended to limit the invention, and further modifications are possible within the scope of the invention.

Claims (27)

1. 一种SCR计量喷射模块，包括一个支架，一个安装在支架一端的脉冲泵，一个固定在支架另一端的上端盖，一个喷嘴和一个控制器，其特征在于：支架从DEF储液罐的上部深入到DEF储液罐的底部，并通过上端盖固定在储液罐上，脉冲泵包括螺线管驱动器和柱塞泵，一个轴向贯穿的内流道，工作液(DEF)通过设置在内流道下端入口处的第一过滤器进入到内流道的入口，内流道的出口高于内流道的入口布置，进入内流道的工作液一部分由柱塞泵压送至喷嘴，一部分从内流道的出口排出脉冲泵。An SCR metering injection module includes a bracket, a pulse pump mounted at one end of the bracket, an upper end cap fixed to the other end of the bracket, a nozzle and a controller, wherein the bracket is deep from the upper portion of the DEF reservoir To the bottom of the DEF liquid storage tank and fixed to the liquid storage tank through the upper end cover, the pulse pump includes a solenoid driver and a plunger pump, an axially extending inner flow passage, and the working fluid (DEF) is set in the inner flow. The first filter at the lower end of the tunnel enters the inlet of the inner runner, the outlet of the inner runner is arranged higher than the inlet of the inner runner, and a portion of the working fluid entering the inner runner is pumped to the nozzle by the plunger pump, a part of which is The outlet of the inner flow path discharges the pulse pump.
2. 如权利要求1所述的SCR计量喷射模块，其特征在于，所述内流道的出口以能够有效防止固体杂物进入内流道且使DEF能够顺利进入内流道的方式设定。The SCR metering injection module according to claim 1, wherein the outlet of the inner flow passage is set in such a manner as to effectively prevent solid foreign matter from entering the inner flow passage and allowing the DEF to smoothly enter the inner flow passage.
3. 如权利要求2所述的SCR计量喷射模块，其特征在于：所述内流道的出口位于邻近DEF储液罐最高空间的位置。The SCR metering injection module of claim 2 wherein the outlet of the inner flow passage is located adjacent the highest space of the DEF reservoir.
4. 如权利要求2所述的SCR计量喷射模块，其特征在于：在内流道的出口处设置第二过滤器，第二过滤器的过滤孔大于等于第一过滤器的过滤孔。The SCR metering injection module according to claim 2, wherein a second filter is disposed at the outlet of the inner flow passage, and the filter hole of the second filter is greater than or equal to the filter hole of the first filter.
5. 如权利要求3或者4所述的SCR计量喷射模块，其特征在于：包括一个位于脉冲泵外部，与内流道并联的外流道，外流道上设置两个接口分别与内流道连通。The SCR metering injection module according to claim 3 or 4, further comprising an outer flow passage located outside the pulse pump and connected in parallel with the inner flow passage, wherein the outer flow passage is provided with two interfaces respectively communicating with the inner flow passage.
6. 如权利要求4所述的SCR计量喷射模块，其特征在于：外流道串联一个分离腔，分离腔为一个具有一定容积的空间。The SCR metering injection module according to claim 4, wherein the outer flow passage is connected in series with a separation chamber, and the separation chamber is a space having a certain volume.
7. 如权利要求5所述的SCR计量喷射模块，其特征在于：所述分离腔由过滤器内部容积形成。The SCR metering jet module of claim 5 wherein said separation chamber is formed by a filter internal volume.
8. 如权利要求1-7之一项所述的SCR计量喷射模块，其特征在于：包括一个连接脉冲泵和喷嘴的压力管。The SCR metering injection module according to any one of claims 1 to 7, characterized by comprising a pressure tube connecting the pulse pump and the nozzle.
9. 如权利要求1-8之一项所述的SCR计量喷射模块，其特征在于：沿支架上下布置有融冰器。The SCR metering injection module according to any one of claims 1-8, characterized in that an ice melting device is arranged above and below the bracket.
10. 如权利要求9所述的SCR计量喷射模块，其特征在于：所述融冰器为一个发动机冷却液回路，所述支架与发动机冷却液回路合二为一。The SCR metering injection module of claim 9 wherein said ice blaster is an engine coolant circuit and said cradle and engine coolant circuit are combined.
11. 如权利要求9所述的SCR计量喷射模块，其特征在于：所述融冰器为一个电加热器，所述支架与电加热器合二为一。The SCR metering injection module according to claim 9, wherein said ice melting device is an electric heater, and said bracket and said electric heater are combined into one.
12. 如权利要求1-11之一项所述的SCR计量喷射模块，其特征在于：所述喷嘴为一个依靠压力开启的喷嘴。The SCR metering injection module according to any one of claims 1 to 11, wherein the nozzle is a nozzle that is opened by pressure.
13. 如权利要求1-11之一项所述的SCR计量喷射模块，其特征在于：所述喷嘴为一个靠电磁力开启的喷嘴。The SCR metering injection module according to any one of claims 1 to 11, wherein the nozzle is a nozzle that is opened by electromagnetic force.
14. 如权利要求12或者13所述的SCR计量喷射模块，其特征在于：包括一个气液混合腔，气液混合腔一端连接一个压缩空气源，另一端通过一个输送管连接一个喷射器，喷射器固定在发动机排气管上，所述喷嘴将工作液喷入气液混合腔，工作液在气液混合腔中与压缩空气混合并通过喷射器喷入发动机排气管中；在混合腔和压缩空气源之间串联一个电磁阀，在所述SCR计量喷射模块停止工作之后，压缩空气滞后关闭，以确保输送管和喷射器中没有残留工作液。The SCR metering injection module according to claim 12 or 13, comprising a gas-liquid mixing chamber, one end of the gas-liquid mixing chamber is connected to a source of compressed air, and the other end is connected to an injector through a conveying pipe, and the injector is fixed. On the engine exhaust pipe, the nozzle sprays the working fluid into the gas-liquid mixing chamber, and the working fluid is mixed with the compressed air in the gas-liquid mixing chamber and injected into the engine exhaust pipe through the injector; in the mixing chamber and the compressed air A solenoid valve is connected in series between the sources, and after the SCR metering injection module is stopped, the compressed air lags off to ensure that no working fluid remains in the duct and the injector.
15. 如权利要求14所述的SCR计量喷射模块，其特征在于：所述气液混合腔固定在支架之上端上。The SCR metering jet module of claim 14 wherein said gas-liquid mixing chamber is attached to the upper end of the bracket.
16. 如权利要求12所述的SCR计量喷射模块，其特征在于：所述喷嘴固定在发动机排气管上，压力管从支架之上端盖穿过到达喷嘴，工作液通过喷嘴喷入发动机排气管中。The SCR metering injection module according to claim 12, wherein the nozzle is fixed on an exhaust pipe of the engine, the pressure pipe passes from the upper end cover of the bracket to the nozzle, and the working fluid is sprayed into the engine exhaust pipe through the nozzle. .
17. 如权利要求16所述的SCR计量喷射模块，其特征在于：在所述支架之上端盖和喷嘴之间，沿压力管布置电加热装置，当控制器根据环境温度判断工作液可能结冰时，将启动电加热装置进行融冰。 The SCR metering and jetting module according to claim 16, wherein an electric heating device is arranged along the pressure tube between the end cap and the nozzle above the bracket, and when the controller determines that the working fluid may freeze according to the ambient temperature, The electric heating device will be activated to melt the ice.
18. 如权利要求16所述的SCR计量喷射模块，其特征在于：包括一个串联于压力管中的三通接头，位于上盖附近，三通接头之第三支管接头通过一个电磁阀接入一个压缩空气源，控制器判断满足喷射结束逻辑后，将开启所述电磁阀，用压缩空气扫除残留在从三通至喷嘴之间的工作液。The SCR metering injection module according to claim 16, comprising a three-way joint connected in series with the pressure tube, located near the upper cover, and the third branch joint of the three-way joint is connected to a compressed air through a solenoid valve. After the controller determines that the injection end logic is satisfied, the solenoid valve is opened, and the working fluid remaining between the slave tee and the nozzle is swept away by compressed air.
19. 如权利要求1-18之一所述的SCR计量喷射模块，其特征在于，控制器包括单片机，脉冲泵驱动电路，传感器信号处理电路，CAN总线数据收发器。The SCR metering injection module according to any one of claims 1 to 18, wherein the controller comprises a single chip microcomputer, a pulse pump driving circuit, a sensor signal processing circuit, and a CAN bus data transceiver.
20. 一种SCR计量喷射模块的控制方法，如权利要求19所述的SCR计量喷射模块，其特征在于，控制器预存有脉冲泵的特性参数。A method of controlling an SCR metering injection module, such as the SCR metering injection module of claim 19, wherein the controller prestores characteristic parameters of the pulse pump.
21. 一种SCR计量喷射模块的控制方法，如权利要求19所述的SCR计量喷射模块，其特征在于，控制方法包括以下步骤，A control method of an SCR metering injection module, the SCR metering injection module according to claim 19, wherein the control method comprises the following steps,

    a)控制器从通讯接口获得目标流量；a) the controller obtains the target traffic from the communication interface;

    b)控制器根据目标流量确定计量参数；b) the controller determines the measurement parameter according to the target flow rate;

    c)控制器根据包括储液罐内温度和液位的信息确定是否当前状态满足SCR计量模块能够工作的条件；c) the controller determines, based on the information including the temperature and the liquid level in the liquid storage tank, whether the current state satisfies the condition that the SCR metering module can work;

    d)如果c)中判断为满足SCR计量模块能够工作的条件，控制器根据计量参数向脉冲泵发送驱动信号；d) if it is determined in c) that the condition that the SCR metering module can work, the controller sends a driving signal to the pulse pump according to the metering parameter;

    e)控制器向通信总线发送当前SCR计量模块状态信息。e) The controller sends the current SCR metering module status information to the communication bus.
22. 一种SCR计量喷射模块的控制方法，如权利要求19所述的SCR计量喷射模块，其特征在于，控制方法包括以下步骤，A control method of an SCR metering injection module, the SCR metering injection module according to claim 19, wherein the control method comprises the following steps,

    a)控制器从通讯接口和传感器获取信息，根据包括发动机转速、油门位置和排气温度的信息确定目标流量；a) the controller obtains information from the communication interface and the sensor, and determines the target flow rate based on information including engine speed, throttle position, and exhaust temperature;

    b)控制器根据NOx传感器或氨气传感器信号反馈修正目标流量；b) the controller corrects the target flow according to the NOx sensor or the ammonia sensor signal feedback;

    c)控制器根据目标流量确定计量参数；c) the controller determines the metering parameter according to the target flow rate;

    d)控制器根据包括储液罐内温度和液位的信息确定是否当前状态满足SCR计量模块能够工作的条件；d) the controller determines, according to the information including the temperature and the liquid level in the liquid storage tank, whether the current state satisfies the condition that the SCR metering module can work;

    e)如果d)中判断为满足SCR计量模块能够工作的条件，控制器根据计量参数向脉冲泵发送驱动信号；e) if it is determined in d) that the SCR metering module can work, the controller sends a driving signal to the pulse pump according to the metering parameter;

    f)控制器向通信总线发送当前SCR计量模块状态信息。f) The controller sends the current SCR metering module status information to the communication bus.
23. 如权利要求21或者22所述的SCR计量喷射模块的控制方法，其特征在于，控制器预存有计量参数与标准流量关系的二维数据，标准流量对应标准电压和标准温度的流量，控制器同时预存有电压和温度对流量的修正系数。The control method of the SCR metering injection module according to claim 21 or 22, wherein the controller prestores two-dimensional data of the relationship between the metering parameter and the standard flow rate, and the standard flow rate corresponds to the flow rate of the standard voltage and the standard temperature, and the controller simultaneously Pre-stored voltage and temperature correction factors for flow.
24. 如权利要求20-23之一项所述SCR计量喷射模块的控制方法，其特征在于，控制器采集储液罐内温度和工作液液面位置，当储液罐温度低于所定值或者工作液位低于所定值时，控制器不发送工作液喷射信号。A method for controlling an SCR metering injection module according to any one of claims 20-23, wherein the controller collects the temperature in the liquid storage tank and the liquid level of the working fluid, when the temperature of the liquid storage tank is lower than a predetermined value or a working fluid When the bit is lower than the set value, the controller does not send the working fluid injection signal.
25. 如权利要求24所述SCR计量喷射模块的控制方法，其特征在于，所述控制器向通讯总线发出储液罐温度，工作液位信息，以及其他信息代码。A method of controlling an SCR metering injection module according to claim 24, wherein said controller issues a reservoir temperature, operating level information, and other information codes to the communication bus.
26. 一种SCR计量喷射模块的控制方法，如权利要求19所述的SCR计量喷射模块，其特征在于，所述控制器还包括一个蓝牙模块，可以通过该蓝牙模块与外界智能设备交换数据。A control method of an SCR metering injection module, such as the SCR metering injection module of claim 19, wherein the controller further comprises a Bluetooth module through which data can be exchanged with an external smart device.
27. 如权利要求25所述SCR计量喷射模块的控制方法，其特征在于，外界智能设备通过无线网络将所述数据传送到远程终端。 A method of controlling an SCR metering injection module according to claim 25, wherein the external smart device transmits the data to the remote terminal via the wireless network.

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