WO2023087945A1 - Cooling control method for supercharger - Google Patents

Cooling control method for supercharger Download PDF

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Publication number
WO2023087945A1
WO2023087945A1 PCT/CN2022/122601 CN2022122601W WO2023087945A1 WO 2023087945 A1 WO2023087945 A1 WO 2023087945A1 CN 2022122601 W CN2022122601 W CN 2022122601W WO 2023087945 A1 WO2023087945 A1 WO 2023087945A1
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Prior art keywords
engine
supercharger
speed
water pump
electronic water
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PCT/CN2022/122601
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French (fr)
Chinese (zh)
Inventor
林承伯
孙云龙
彭文
张旭
李子清
何炎迎
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广州汽车集团股份有限公司
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Publication of WO2023087945A1 publication Critical patent/WO2023087945A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0493—Controlling the air charge temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/12—Arrangements for cooling other engine or machine parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/164—Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to the technical field of engine superchargers, in particular to a supercharger cooling control method.
  • the cooling system scheme used in the whole vehicle on the market is usually a mechanical water pump + thermostat, and the thermostat is used to realize the adjustment of the two branches of the large circulation of the radiator and the small circulation of the bypass.
  • the thermostat is generally designed to gradually open the large cycle when it reaches 80-90°C, so that the flow enters the radiator for heat dissipation.
  • the speed of the mechanical water pump is related to the speed of the engine, and the thermostat is only physically regulated by the melting of paraffin, neither of them can perform too much active control on the cooling system.
  • Supercharged intercooling is now very common as a mainstream technology.
  • this technology involves two sets of cooling systems, one of which is a high-temperature cooling system, that is, the engine cooling system.
  • the second is the medium temperature cooling system, that is, the air intake intercooling system, the purpose of which is to reduce the intake air temperature.
  • the turbine of the supercharger needs to be cooled due to the long-term endurance of the exhaust gas of up to 700-900°C, and the reliability of the metal due to thermal fatigue.
  • the supercharger is generally connected to the high-temperature cooling system of the engine. Mechanical water pump and thermostat for cooling control.
  • the high-temperature cooling water of the engine is 90-110°C, it is still very low compared with the exhaust gas which is as high as 700-900°C, and it can be cooled under normal working conditions.
  • the coolant inside the cooling water pipe near the turbocharger turbine stops flowing, and will be heated to boiling by the metal wall of the turbine in a short time. At this time, the metal wall cannot be effectively cooled. Heat exchange, if this happens for a long time, the turbine will fail.
  • after the liquid boils it will quickly build up pressure in the expansion kettle and open the vent valve to release the pressure, causing some water vapor to overflow. If this happens for a long time, the coolant will decrease and the cooling effect of the engine will deteriorate.
  • the present invention provides a supercharger cooling control method, the cooling of the supercharger is realized by the medium temperature cooling system, through the control of the electronic water pump, on the premise that the intake air temperature meets the engine demand, the supercharger is guaranteed not to exceed temperature, and after-cooling can be achieved after the car is turned off, avoiding the overheating of the turbine, and solving the problem that the coolant in the expansion kettle is easy to boil after the car is turned off.
  • a supercharger cooling control method provided by the present invention includes: judging whether the engine is in a normal working state; if the engine is in a normal working state, further determining the electronic water pump speed required to meet the engine target intake air temperature under the current working condition and Under the current working conditions, the electronic water pump speed required for supercharger cooling is met, and the electronic water pump is controlled by the greater of the electronic water pump speed required to meet the target intake air temperature and the electronic water pump speed required for supercharger cooling. ; If the engine is in an abnormal working state, it is further judged whether the supercharger needs post-cooling treatment; if the supercharger needs post-cooling treatment, it is further determined to meet the required electronic water pump speed for the supercharger post-cooling treatment.
  • judging whether the engine is in a normal working state includes: judging whether the engine speed is higher than the idle threshold; if the engine speed is higher than the idle threshold, then confirming that the engine is in a normal working state; normal working condition.
  • judging whether the supercharger needs post-cooling treatment includes: judging whether the rate of change of the engine speed is less than 0; if the rate of change of the engine speed is greater than 0, it is determined that the supercharger does not need after-cooling treatment; If it is less than 0, continue to observe until the rate of change of the engine speed is equal to 0; if the rate of change of the engine speed is equal to 0, then further judge whether the engine water temperature is higher than the post-run threshold at the moment; if the engine water temperature is lower than the post-run threshold at the moment, then The electronic water pump stops; if the engine water temperature is higher than the post-operation threshold at this moment, it is determined that the supercharger needs post-cooling treatment.
  • the engine before judging whether the engine is in a normal working state, it also includes: system self-inspection, the self-inspection objects include sensors and actuators of each system of the engine; if everything is normal in the system, supercharger cooling control is performed, and an alarm is issued if the system is abnormal , engine torque limit.
  • system self-inspection the self-inspection objects include sensors and actuators of each system of the engine; if everything is normal in the system, supercharger cooling control is performed, and an alarm is issued if the system is abnormal , engine torque limit.
  • determining the electronic water pump speed required to meet the target intake air temperature under different working conditions of the engine includes: determining the current working condition of the engine according to the current engine speed and engine load; The target intake air temperature and the initial speed of the electronic water pump; based on the temperature difference between the actual intake air temperature and the target intake air temperature, PID closed-loop control is performed on the speed of the electronic water pump until the actual intake air temperature matches the target intake air temperature.
  • the current working conditions include three working conditions: high, medium and low.
  • determining the electronic water pump speed required for supercharger cooling under the current working condition includes: obtaining the current working condition of the supercharger based on the engine speed and engine load;
  • the minimum speed of the electronic water pump required for supercharger cooling under the current working condition is the speed of the electronic water pump required for the supercharger not to overheat under the current working condition.
  • the speed of the electronic water pump when the post-cooling process of the supercharger is satisfied is determined based on the current engine water temperature look-up table. Table OK.
  • the present invention has the following beneficial technical effects:
  • a supercharger cooling control method provided by the present invention is based on the characteristics of the design of the engine cooling system.
  • the low-power electronic water pump provides cooling for the supercharger.
  • There is no need to add a high-power electronic water pump which avoids the increase in cost. It can also avoid boiling in the expansion kettle after the car is turned off and shut down.
  • the control method of the present invention when the medium-temperature cooling system executes the control of the electronic water pump, different working conditions of the supercharger are distinguished, and the allowable lower limit of the electronic water pump is restricted. power.
  • Fig. 1 is a system diagram of a supercharger cooling control method of the present invention
  • Fig. 2 is a flowchart of a supercharger cooling control method according to the present invention.
  • a supercharger cooling control method provided by the present invention, connect the cooling system of the supercharger to the medium temperature cooling system of the engine, connect the coolant inlet of the supercharger to the electronic water pump and the intercooler During this period, the coolant outlet of the supercharger is connected to the sub-expansion water tank of the intercooler, so that the supercharger can be cooled by the electronic water pump in the medium temperature cooling system itself.
  • the cooling process of the whole system includes the control of the intake air temperature when the engine is working normally, the cooling of the supercharger when the engine is working normally, and the post-cooling treatment of the supercharger after the engine stops.
  • the speed of the electronic water pump must meet both the intake air temperature control requirement and the cooling requirement of the supercharger, because when cooling the intake air temperature, the electronic water pump itself needs to consume work, such as adding the cooling requirement of the supercharger, it will A further increase in power consumption will eventually be reflected in an increase in engine fuel consumption. Therefore, on the premise of meeting the intake air temperature and cooling requirements of the supercharger, the power of the electronic water pump should be reduced as much as possible.
  • the main reason for controlling the intake air temperature is that the gas density changes greatly with the temperature. When the temperature is high, the gas at the same volume flow rate has less mass, and it is difficult to match the corresponding gas density after entering the engine. Fuel quality has a great influence on engine performance.
  • the reason for the post-cooling treatment of the supercharger after shutdown is that, outside the normal working state, the car is driven vigorously for a long time, and when the temperature is high, it will suddenly stop. Due to the coupling of the mechanical water pump and the speed, it will also stop immediately. At this time, there is nothing in the system. The flow rate will cause the heat of the supercharger to accumulate in a short period of time, causing the coolant to boil. Therefore, after the supercharger is connected to the medium temperature cooling system, after-cooling treatment after shutdown is required.
  • a supercharger cooling control method provided by the present invention specifically includes the following steps:
  • the EMS of the engine conducts a self-check on the system. If the system is normal, it will perform supercharger cooling control. If the system is abnormal, it will alarm and limit the engine torque.
  • the EMS of the engine needs to perform a system self-check first to determine whether there is a fault in the system. If there is no fault in the system, it will enter the cooling control process of the present invention. If there is a fault in the system, the EMS will report a fault. And limit the torque of the engine.
  • the self-inspection objects include sensors (temperature sensors, etc.) and actuators (radiators, electronic water pumps, etc.) of each system of the engine. If individual sensors and actuators report failures during the self-inspection process, it may involve that the follow-up control cannot be carried out normally. It cannot enter the normal working state. Therefore, in this case, the EMS needs to report a fault and limit the torque of the engine to prevent the engine from reaching a higher power in an unexpected state and causing more serious mechanical damage.
  • the EMS judges whether the engine speed is higher than the idle speed threshold, and confirms whether the engine is in a normal working state according to the judgment result.
  • the engine speed is collected internally by the EMS, and the idle speed threshold is a preset value obtained through testing, which can be obtained by looking up a table. If the engine speed is higher than the idle speed threshold, it indicates that the engine is in normal working condition, and the intake air temperature needs to be controlled and the supercharger should be cooled; if the engine speed is lower than the idle speed threshold, it indicates that the engine is in abnormal working condition and is starting Or prepare to stop, if the engine is starting, no additional processing is required, and if the engine is preparing to stop, it is necessary to continue to judge whether to perform post-cooling treatment.
  • the intake air temperature control of the engine is related to the working conditions of the engine.
  • the working conditions of the engine are divided into three types of loads: low, medium and high.
  • the high load working condition is a working condition close to the external characteristics of the engine.
  • the performance requirements Generally, the turbocharger is required to work at full load. At this time, a high exhaust gas flow rate is required, and due to the high heat load, the exhaust gas temperature is high, which is the worst working condition for the supercharger to withstand temperature;
  • the compressor is not working at full load, the exhaust gas is bypassed by the exhaust valve, and not all of it flows through the supercharger, and the engine heat load is low, the exhaust gas temperature is not high, and the temperature resistance of the supercharger is good. Therefore, the EMS needs to determine the electronic water pump speed required to meet the target intake air temperature under each operating condition based on the engine operating conditions.
  • the EMS internally collects the current engine speed and load, and then the EMS can obtain the current working condition of the engine based on the engine speed and load table lookup, and then obtain the target intake air temperature and The initial speed of the electronic water pump.
  • the EMS checks the table to obtain the P correction amount and I correction amount, and then corrects the electronic water pump speed.
  • the P correction amount is a single correction amount, and the I correction amount gradually increases with time t.
  • the intake air temperature and the power consumption of the electronic water pump need to be taken into account during actual control. Under this combination, the engine will spend the minimum power consumption cost to obtain the lowest intake air temperature, so as to achieve optimal fuel consumption. Therefore, the EMS can obtain the current working state of the supercharger based on the engine speed and engine load look-up table.
  • the minimum speed of the electronic water pump required for cooling the supercharger under the current working conditions can be obtained from the actual intake air temperature look-up table (the load state of the supercharger and the intake air temperature are the test preset values).
  • Electronic water pump speed required for compressor cooling can be obtained from the actual intake air temperature look-up table (the load state of the supercharger and the intake air temperature are the test preset values).
  • the minimum cooling demand of the supercharger needs to be met first. Therefore, it is necessary to determine the speed of the electronic water pump required to meet the target intake air temperature in S3 and S4 and the speed required to meet the cooling requirements of the supercharger.
  • the speed of the electronic water pump is constrained by the lower limit, and the larger of the two is used for output, so as to control the electronic water pump.
  • the EMS judges that the engine speed is lower than the idle threshold, it is considered to be starting at this time, or is about to be shut down. If the engine is starting, no additional processing is required. If the engine is about to be shut down, it needs to judge whether to perform post-cooling treatment.
  • the stop status bit is set equal to 1.
  • the shutdown state bit is equal to 1, it is necessary to judge whether the engine is in a hot state or a cold state, that is, to judge whether it is necessary to perform an after-cooling process on the supercharger.
  • the general water temperature sensor Since the general water temperature sensor is only arranged in the high temperature cooling system, it can only be judged based on the sensor in the high temperature cooling system at this time. Therefore, EMS continues to judge whether the engine water temperature is higher than the post-running threshold (the engine water temperature is collected by the temperature sensor, and the post-running threshold is the test preset value). If it is lower than the threshold, the electronic water pump will stop. If it is higher than the supercharger Post-cooling processing is required, and the post-cooling requirement bit is equal to 1, otherwise it is 0.
  • the EMS maintains the electronic water pump to continue to work, but at this time its speed is no longer based on the engine operating conditions. Its speed and working time are set based on the water temperature of the engine. It is obtained by looking up the table, and the working time generally does not exceed the allowable time of post-running of the EMS. When the post-running time reaches the set value, or if there is no post-cooling demand, the electronic water pump will stop and the post-cooling mode ends.
  • the engine speed, engine load, actual intake air temperature, and engine water temperature mentioned above are all collected or calculated signals inside the EMS; the tables are obtained based on corresponding calibration experiments and stored in the EMS in advance.
  • the initial speed of the water pump, the target intake air temperature, the P correction amount, the I correction amount, the working condition of the engine, the working condition of the supercharger, the post-operation threshold, the post-operation speed, and the working time can all be obtained by querying the preset table.
  • the present invention provides a supercharger cooling control method, based on the design characteristics of the engine cooling system, the supercharger cooling system is connected to the engine’s medium-temperature cooling system instead of remaining in the high-temperature cooling system.
  • the low-power electronic water pump in the medium-temperature cooling system provides cooling for the supercharger.
  • a high-power electronic water pump which avoids an increase in cost and can also avoid boiling in the expansion kettle after the car is turned off and shut down. Phenomenon.
  • the control method of the present invention when the medium-temperature cooling system executes the control of the electronic water pump, different working conditions of the supercharger are distinguished, and the allowable lower limit of the electronic water pump is restricted. power.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
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  • General Engineering & Computer Science (AREA)
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Abstract

A cooling control method for a supercharger, comprising: before a medium temperature system performs a cooling process, an EMS of an engine needing to perform self-inspection; if the system is normal, the EMS needing to determine whether an engine rotational speed is higher than an idle speed threshold; if the engine rotational speed is higher than the idle speed threshold, determining an electronic water pump rotational speed required for satisfying a target air intake temperature under different engine operating conditions and an electronic water pump rotational speed required when the supercharger is not overheated under different operating conditions; performing lower limit constraint on the output of the electronic water pump rotational speeds in the previous step; and if the engine rotational speed is lower than the idle speed threshold, observing whether the change rate of the engine rotational speed is less than 0, and determining whether the supercharger needs to perform post-cooling treatment and other steps. No high-power electronic water pump needs to be newly added in the control method, such that the increasing of cost can be avoided, and boiling in an expansion kettle after a vehicle stalls and halts can also be avoided.

Description

一种增压器冷却控制方法A supercharger cooling control method
本申请要求于2021年11月22日提交中国专利局，申请号为202111403685.0，发明名称为“一种增压器冷却控制方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。This application claims the priority of the Chinese patent application filed on November 22, 2021 with the application number 202111403685.0 and the title of the invention is "A Supercharger Cooling Control Method" submitted to the China Patent Office, the entire contents of which are incorporated by reference in this application middle.
技术领域technical field
本发明涉及发动机增压器技术领域，具体涉及一种增压器冷却控制方法。The invention relates to the technical field of engine superchargers, in particular to a supercharger cooling control method.
背景技术Background technique
目前市面上整车使用的冷却***方案，通常为机械水泵+节温器，通过节温器来实现散热器大循环、旁通小循环两个支路的调节。节温器一般设计为达到80-90℃时逐渐打开大循环，使流量进入散热器进行散热。在这种冷却***中，由于机械水泵转速与发动机转速关联，且节温器仅通过石蜡的融化来实现物理调控，二者均无法对冷却***进行过多的主动控制。At present, the cooling system scheme used in the whole vehicle on the market is usually a mechanical water pump + thermostat, and the thermostat is used to realize the adjustment of the two branches of the large circulation of the radiator and the small circulation of the bypass. The thermostat is generally designed to gradually open the large cycle when it reaches 80-90°C, so that the flow enters the radiator for heat dissipation. In this cooling system, since the speed of the mechanical water pump is related to the speed of the engine, and the thermostat is only physically regulated by the melting of paraffin, neither of them can perform too much active control on the cooling system.
增压中冷如今作为主流技术非常常见，一般来说这项技术涉及到两组冷却***，其一为高温冷却***，即发动机冷却***。其二为中温冷却***，即进气中冷***，目的为降低进气温度。增压器的涡轮机由于长期耐受高达700-900℃的尾气，金属存在热疲劳的可靠性问题，因此需要冷却，按主流设计，一般将增压器接入发动机的高温冷却***，利用普通的机械水泵、节温器进行冷却控制。Supercharged intercooling is now very common as a mainstream technology. Generally speaking, this technology involves two sets of cooling systems, one of which is a high-temperature cooling system, that is, the engine cooling system. The second is the medium temperature cooling system, that is, the air intake intercooling system, the purpose of which is to reduce the intake air temperature. The turbine of the supercharger needs to be cooled due to the long-term endurance of the exhaust gas of up to 700-900°C, and the reliability of the metal due to thermal fatigue. According to the mainstream design, the supercharger is generally connected to the high-temperature cooling system of the engine. Mechanical water pump and thermostat for cooling control.
这种情况下，发动机的高温冷却水尽管有90-110℃，但是与高达700-900℃的尾气相比依然很低，普通工况下是能够得到冷却的。但是当汽车熄火下电，机械水泵停止工作后，在增压器涡轮机附近的冷却水管内部冷却液停止流动，将在短时间内被涡轮机的金属壁面加热至沸腾，此时无法有效对金属壁面进行换热，长期如此将导致涡轮机失效，另外液体沸腾后将在膨胀水壶中迅速建立压力并顶开泄气阀泄压，导致部分水蒸气溢出，长期如此将导致冷却液减少，发动机冷却效果变差。In this case, although the high-temperature cooling water of the engine is 90-110°C, it is still very low compared with the exhaust gas which is as high as 700-900°C, and it can be cooled under normal working conditions. However, when the car is powered off and the mechanical water pump stops working, the coolant inside the cooling water pipe near the turbocharger turbine stops flowing, and will be heated to boiling by the metal wall of the turbine in a short time. At this time, the metal wall cannot be effectively cooled. Heat exchange, if this happens for a long time, the turbine will fail. In addition, after the liquid boils, it will quickly build up pressure in the expansion kettle and open the vent valve to release the pressure, causing some water vapor to overflow. If this happens for a long time, the coolant will decrease and the cooling effect of the engine will deteriorate.
发明内容Contents of the invention
有鉴于此，本发明提供一种增压器冷却控制方法，增压器的冷却由中温冷却***实现，通过电子水泵的控制，在确保进气温度满足发动机需求的前提下，保证增压器不过温，并可在汽车熄火后实现后冷却，避免了涡轮过热，解决了以往熄火后膨胀水壶中的冷却液容易沸腾的问题。In view of this, the present invention provides a supercharger cooling control method, the cooling of the supercharger is realized by the medium temperature cooling system, through the control of the electronic water pump, on the premise that the intake air temperature meets the engine demand, the supercharger is guaranteed not to exceed temperature, and after-cooling can be achieved after the car is turned off, avoiding the overheating of the turbine, and solving the problem that the coolant in the expansion kettle is easy to boil after the car is turned off.
本发明提供的一种增压器冷却控制方法，包括：判断发动机是否处于正常工作状态；若发动机处于正常工作状态，则进一步确定当前工况下满足发动机目标进气温度所需的电子水泵转速以及当前工况下满足增压器冷却所需的电子水泵转速，并以满足目标进气温度所需的电子水泵转速和满足增压器冷却所需的电子水泵转速中的较大者进行电子水泵控制；若发动机处于非正常工作状态，则进一步判断增压器是否需要后冷却处理；若增压器需要后冷却处理，则进一步确定满足增压器后冷却处理所需的电子水泵转速。A supercharger cooling control method provided by the present invention includes: judging whether the engine is in a normal working state; if the engine is in a normal working state, further determining the electronic water pump speed required to meet the engine target intake air temperature under the current working condition and Under the current working conditions, the electronic water pump speed required for supercharger cooling is met, and the electronic water pump is controlled by the greater of the electronic water pump speed required to meet the target intake air temperature and the electronic water pump speed required for supercharger cooling. ; If the engine is in an abnormal working state, it is further judged whether the supercharger needs post-cooling treatment; if the supercharger needs post-cooling treatment, it is further determined to meet the required electronic water pump speed for the supercharger post-cooling treatment.
进一步地，判断发动机是否处于正常工作状态包括：判断发动机转速是否高于怠速阈值；若发动机转速高于怠速阈值，则确认发动机处于正常工作状态；若发动机转速低于怠速阈值，则确认发动机处于非正常工作状态。Further, judging whether the engine is in a normal working state includes: judging whether the engine speed is higher than the idle threshold; if the engine speed is higher than the idle threshold, then confirming that the engine is in a normal working state; normal working condition.
进一步地，判断增压器是否需要后冷却处理包括：判断发动机转速的变化率是否小于0；若发动机转速的变化率大于0，则判定增压器无需进行后冷却处理；若发动机转速的变化率小于0，则继续观察，直到发动机转速的变化率等于0；若发动机转速的变化率等于0时，则进一步判断此刻发动机水温是否高于后运行阈值；若此刻发动机水温低于后运行阈值，则电子水泵停机；若此刻发动机水温高于后运行阈值，则确定增压器需要进行后冷却处理。Further, judging whether the supercharger needs post-cooling treatment includes: judging whether the rate of change of the engine speed is less than 0; if the rate of change of the engine speed is greater than 0, it is determined that the supercharger does not need after-cooling treatment; If it is less than 0, continue to observe until the rate of change of the engine speed is equal to 0; if the rate of change of the engine speed is equal to 0, then further judge whether the engine water temperature is higher than the post-run threshold at the moment; if the engine water temperature is lower than the post-run threshold at the moment, then The electronic water pump stops; if the engine water temperature is higher than the post-operation threshold at this moment, it is determined that the supercharger needs post-cooling treatment.
进一步地，在判断发动机是否处于正常工作状态之前还包括：***自检，自检对象包括发动机各个***的传感器和执行器；如***一切正常，则进行增压器冷却控制，如***异常则报警，发动机限扭。Further, before judging whether the engine is in a normal working state, it also includes: system self-inspection, the self-inspection objects include sensors and actuators of each system of the engine; if everything is normal in the system, supercharger cooling control is performed, and an alarm is issued if the system is abnormal , engine torque limit.
进一步地，确定发动机不同工况下的满足目标进气温度所需的电子水泵转速包括：根据当前发动机转速及发动机负荷确定发动机当前所处工况；基于当前工况查表得到当前工况对应的目标进气温度以及电子水泵初始转速；基于实际进气温度与目标进气温度之间的温差对电子水泵的转速进行PID闭环控制，直至实际进气温度与目标进气温度之间吻合。Further, determining the electronic water pump speed required to meet the target intake air temperature under different working conditions of the engine includes: determining the current working condition of the engine according to the current engine speed and engine load; The target intake air temperature and the initial speed of the electronic water pump; based on the temperature difference between the actual intake air temperature and the target intake air temperature, PID closed-loop control is performed on the speed of the electronic water pump until the actual intake air temperature matches the target intake air temperature.
进一步地，基于实际进气温度与目标进气温度之间的温差对电子水泵的转速进行PID闭环控制时依据的计算公式为：当前工况下的满足目标进气温度所需的电子水泵转速＝电子水泵初始转速+P+I*t，其中P修正量为单次修正量，I修正量随时间t逐渐累积。Further, the calculation formula based on the PID closed-loop control of the speed of the electronic water pump based on the temperature difference between the actual intake air temperature and the target intake air temperature is: the speed of the electronic water pump required to meet the target intake air temperature under the current working condition = The initial speed of the electronic water pump +P+I*t, where the P correction amount is a single correction amount, and the I correction amount gradually accumulates with time t.
进一步地，当前所处的工况包括高、中、低三种工况。Further, the current working conditions include three working conditions: high, medium and low.
进一步地，确定当前工况下增压器冷却所需的电子水泵转速包括：基于发动机转速以及 发动机负荷得到当前增压器的工况；基于增压器负荷、实际进气温度查表得到当前工况下增压器冷却所需的电子水泵最低转速，该转速即为当前工况下增压器不过热所需的电子水泵转速。Further, determining the electronic water pump speed required for supercharger cooling under the current working condition includes: obtaining the current working condition of the supercharger based on the engine speed and engine load; The minimum speed of the electronic water pump required for supercharger cooling under the current working condition is the speed of the electronic water pump required for the supercharger not to overheat under the current working condition.
进一步地，设定时刻t1、t2，以固定频率观察设定时刻t1、t2发动机转速的变化趋势，则发动机转速的变化率＝(t2时刻发动机转速-t1时刻发动机转速)/(t2-t1)，并连续监测三次。Further, set the time t1 and t2, and observe the change trend of the engine speed at the set time t1 and t2 with a fixed frequency, then the change rate of the engine speed=(engine speed at t2-engine speed at t1)/(t2-t1) , and continuously monitored three times.
进一步地，满足增压器后冷却处理时的电子水泵转速基于当前发动机的水温查表确定，若发动机的工作时长达到设定值时，后冷却模式结束，发动机的工作时长基于当前发动机的水温查表确定。Further, the speed of the electronic water pump when the post-cooling process of the supercharger is satisfied is determined based on the current engine water temperature look-up table. Table OK.
与现有的技术相比，本发明具有以下有益的技术效果：Compared with the prior art, the present invention has the following beneficial technical effects:
本发明提供的一种增压器冷却控制方法，基于发动机冷却***设计的特点，将增压器冷却***接入发动机的中温冷却***，而非继续留存于高温冷却***，通过中温冷却***中的小功率电子水泵为增压器提供冷却，无需新增高功率电子水泵，避免了成本的增加，亦能够在汽车熄火停机之后，避免膨胀水壶内出现沸腾现象。此外，通过本发明的控制方法，在中温冷却***执行电子水泵的控制时，对增压器不同工况进行了区分，约束电子水泵的许用下限，在非必要情况下，无需提升电子水泵的功率。A supercharger cooling control method provided by the present invention is based on the characteristics of the design of the engine cooling system. The low-power electronic water pump provides cooling for the supercharger. There is no need to add a high-power electronic water pump, which avoids the increase in cost. It can also avoid boiling in the expansion kettle after the car is turned off and shut down. In addition, through the control method of the present invention, when the medium-temperature cooling system executes the control of the electronic water pump, different working conditions of the supercharger are distinguished, and the allowable lower limit of the electronic water pump is restricted. power.
附图说明Description of drawings
图1为本发明一种增压器冷却控制方法的***图；Fig. 1 is a system diagram of a supercharger cooling control method of the present invention;
图2为本发明一种增压器冷却控制方法的流程图。Fig. 2 is a flowchart of a supercharger cooling control method according to the present invention.
具体实施方式Detailed ways
下面结合附图和实施例，对本发明的具体实施方式作进一步详细描述。以下实施例用于说明本发明，但不用来限制本发明的范围。The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
在本发明的描述中，需要说明的是，本描述中指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。In the description of the present invention, it should be noted that the orientation or positional relationship indicated in this description is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the It should not be construed as limiting the invention that a device or element must have a particular orientation, be constructed, and operate in a particular orientation.
请参图1，本发明提供的一种增压器冷却控制方法，将增压器的冷却***接入发动机的中温冷却***，将增压器的冷却液入口接入电子水泵和中冷器之间，将增压器的冷却液出口接入中冷器的副膨胀水箱之间，使增压器可以依靠中温冷却***本身存有的电子水泵进行冷 却。整个***的冷却过程包括发动机正常工作时进气温度的控制和发动机正常工作时增压器的冷却以及停机后增压器的后冷却处理。发动机正常工作时电子水泵的转速需同时满足进气温度控制需求和增压器冷却需求，因为当对进气温度进行冷却时，电子水泵本身需要消耗功，如加入增压器的冷却需求，会进一步提升其功耗，最终都会体现在发动机油耗的升高上，因此，在满足进气温度和增压器冷却需求的前提下，应尽可能降低电子水泵的功率。Please refer to Fig. 1, a supercharger cooling control method provided by the present invention, connect the cooling system of the supercharger to the medium temperature cooling system of the engine, connect the coolant inlet of the supercharger to the electronic water pump and the intercooler During this period, the coolant outlet of the supercharger is connected to the sub-expansion water tank of the intercooler, so that the supercharger can be cooled by the electronic water pump in the medium temperature cooling system itself. The cooling process of the whole system includes the control of the intake air temperature when the engine is working normally, the cooling of the supercharger when the engine is working normally, and the post-cooling treatment of the supercharger after the engine stops. When the engine is working normally, the speed of the electronic water pump must meet both the intake air temperature control requirement and the cooling requirement of the supercharger, because when cooling the intake air temperature, the electronic water pump itself needs to consume work, such as adding the cooling requirement of the supercharger, it will A further increase in power consumption will eventually be reflected in an increase in engine fuel consumption. Therefore, on the premise of meeting the intake air temperature and cooling requirements of the supercharger, the power of the electronic water pump should be reduced as much as possible.
需要说明的是，对进气温度进行控制的主要原因是，气体密度随温度变化较大，温度较高时其同样体积流量下的气体，质量较少，则进入发动机内部后，难以匹配相应的燃油质量，对发动机性能影响较大。停机后增压器的后冷却处理的原因是，在普通工作状态之外，汽车长时间剧烈驾驶，温度较高时突然停机，由于机械水泵与转速耦合，也将立刻停机，此时***内无流量，将造成增压器热量在短时间内聚集，导致冷却液出现沸腾现象，故增压器接入中温冷却***后，还需要进行停机后的后冷却处理。It should be noted that the main reason for controlling the intake air temperature is that the gas density changes greatly with the temperature. When the temperature is high, the gas at the same volume flow rate has less mass, and it is difficult to match the corresponding gas density after entering the engine. Fuel quality has a great influence on engine performance. The reason for the post-cooling treatment of the supercharger after shutdown is that, outside the normal working state, the car is driven vigorously for a long time, and when the temperature is high, it will suddenly stop. Due to the coupling of the mechanical water pump and the speed, it will also stop immediately. At this time, there is nothing in the system. The flow rate will cause the heat of the supercharger to accumulate in a short period of time, causing the coolant to boil. Therefore, after the supercharger is connected to the medium temperature cooling system, after-cooling treatment after shutdown is required.
请参图2，本发明提供的一种增压器冷却控制方法，具体包括以下步骤：Referring to Fig. 2, a supercharger cooling control method provided by the present invention specifically includes the following steps:
S1，发动机的EMS对***进行自检，如***一切正常，则进行增压器冷却控制，如***异常则报警，发动机限扭。S1, the EMS of the engine conducts a self-check on the system. If the system is normal, it will perform supercharger cooling control. If the system is abnormal, it will alarm and limit the engine torque.
具体地，整车上电后，发动机的EMS需先进行***自检，判断***是否存在故障，若***无故障，则进入本发明的冷却控制过程，若***存在故障，则EMS报出故障，并对发动机进行限扭。自检对象包括发动机各个***的传感器(温度传感器等)、执行器(散热器、电子水泵等)，若个别传感器、执行器在自检过程中报出故障，可能涉及后续控制无法正常进行，发动机无法进入正常工作状态，因此，此种情况下EMS需报出故障，并对发动机进行限扭，禁止发动机在非预期状态下达到较高功率而出现更严重的机械损伤。Specifically, after the vehicle is powered on, the EMS of the engine needs to perform a system self-check first to determine whether there is a fault in the system. If there is no fault in the system, it will enter the cooling control process of the present invention. If there is a fault in the system, the EMS will report a fault. And limit the torque of the engine. The self-inspection objects include sensors (temperature sensors, etc.) and actuators (radiators, electronic water pumps, etc.) of each system of the engine. If individual sensors and actuators report failures during the self-inspection process, it may involve that the follow-up control cannot be carried out normally. It cannot enter the normal working state. Therefore, in this case, the EMS needs to report a fault and limit the torque of the engine to prevent the engine from reaching a higher power in an unexpected state and causing more serious mechanical damage.
S2，在进行增压器冷却控制前，EMS判断发动机转速是否高于怠速阈值，根据判断结果确认发动机是否处于正常工作状态。S2. Before performing supercharger cooling control, the EMS judges whether the engine speed is higher than the idle speed threshold, and confirms whether the engine is in a normal working state according to the judgment result.
具体地，发动机转速为EMS内部采集所得，怠速阈值为经过试验所得的预设值，可通过查表所得。若发动机转速高于怠速阈值，则表明发动机处于正常工作状态，需要对进气温度进行控制并对增压器进行冷却；若发动机转速低于怠速阈值，则表明发动机处于非正常工作状态，正在启动或者准备停机，若发动机正在启动则无须额外处理，若发动机准备停机则需继续判断是否要进行后冷却处理。Specifically, the engine speed is collected internally by the EMS, and the idle speed threshold is a preset value obtained through testing, which can be obtained by looking up a table. If the engine speed is higher than the idle speed threshold, it indicates that the engine is in normal working condition, and the intake air temperature needs to be controlled and the supercharger should be cooled; if the engine speed is lower than the idle speed threshold, it indicates that the engine is in abnormal working condition and is starting Or prepare to stop, if the engine is starting, no additional processing is required, and if the engine is preparing to stop, it is necessary to continue to judge whether to perform post-cooling treatment.
S3，若发动机转速高于怠速阈值，则确定发动机不同工况下的满足目标进气温度所需的电子水泵转速以及满足增压器冷却时所需的电子水泵转速。S3. If the engine speed is higher than the idle speed threshold, determine the electronic water pump speed required to meet the target intake air temperature and the electronic water pump speed required to meet the supercharger cooling under different engine operating conditions.
具体地，发动机的进气温度控制与发动机的工况有关，在本发明中，将发动机工况分为低、中、高三种负荷，高负荷工况为接近发动机外特性的工况，性能需求较高，一般要求增压器满载工作，此时需求较高的尾气流量，且由于热负荷高，尾气温度较高，是增压器耐温情况最为恶劣的工况；中低负荷时，增压器未满载工作，尾气由泄气阀旁通，未全部流经增压器，且发动机热负荷较低，尾气温度不高，增压器耐温情况较好。因此，EMS需要基于发动机工况确定每个工况下满足目标进气温度所需的电子水泵转速。Specifically, the intake air temperature control of the engine is related to the working conditions of the engine. In the present invention, the working conditions of the engine are divided into three types of loads: low, medium and high. The high load working condition is a working condition close to the external characteristics of the engine. The performance requirements Generally, the turbocharger is required to work at full load. At this time, a high exhaust gas flow rate is required, and due to the high heat load, the exhaust gas temperature is high, which is the worst working condition for the supercharger to withstand temperature; The compressor is not working at full load, the exhaust gas is bypassed by the exhaust valve, and not all of it flows through the supercharger, and the engine heat load is low, the exhaust gas temperature is not high, and the temperature resistance of the supercharger is good. Therefore, the EMS needs to determine the electronic water pump speed required to meet the target intake air temperature under each operating condition based on the engine operating conditions.
进一步地，EMS内部采集得到当前发动机的转速以及负荷，然后EMS基于发动机转速以及负荷查表可以得到发动机当前属于什么工况，再基于当前工况查表得到当前工况对应的目标进气温度以及电子水泵初始转速。但实际进气温度与目标进气温度之间一般不会立刻契合，而存在温差＝实际进气温度-目标进气温度，故EMS***需基于该差值对电子水泵的转速进行PID闭环控制，直至实际进气温度与目标进气温度之间吻合。EMS基于实际进气温度与目标进气温度的温差，查表得到P修正量与I修正量后，对电子水泵转速进行修正，其中P修正量为单次修正量，I修正量随时间t逐渐累积，即：当前工况下满足目标进气温度所需的电子水泵转速＝电子水泵初始转速+P+I*t。Further, the EMS internally collects the current engine speed and load, and then the EMS can obtain the current working condition of the engine based on the engine speed and load table lookup, and then obtain the target intake air temperature and The initial speed of the electronic water pump. However, the actual intake air temperature and the target intake air temperature generally do not match immediately, and there is a temperature difference = actual intake air temperature - target intake air temperature, so the EMS system needs to perform PID closed-loop control on the speed of the electronic water pump based on this difference. Until the actual intake air temperature coincides with the target intake air temperature. Based on the temperature difference between the actual intake air temperature and the target intake air temperature, the EMS checks the table to obtain the P correction amount and I correction amount, and then corrects the electronic water pump speed. The P correction amount is a single correction amount, and the I correction amount gradually increases with time t. Accumulation, that is: the electronic water pump speed required to meet the target intake air temperature under the current working condition = the initial speed of the electronic water pump + P + I*t.
如前所述，实际控制时需兼顾进气温度以及电子水泵的功耗，在此种组合下，发动机将花费最小的功耗代价，获取最低的进气温度，从而实现油耗最优。因此，EMS基于发动机转速以及发动机负荷查表格，可以得到当前的增压器工作状态，在本发明中，基于设计初期的标定试验将增压器的工作状态划分为BIT＝0,1,2三种状态，0代表增压器低负荷，1代表中负荷，2代表满负荷，此三类工况的本质即低中高三个等级的冷却需求。基于增压器的低中高三档负荷，即BIT＝0,1,2的三种状态，分别设定与之匹配的电子水泵最低转速，每个状态下的电子水泵最低转速，可以基于发动机负荷及实际的进气温度查表得到当前工况下增压器冷却所需的电子水泵最低转速(增压器负荷状态、进气温度为试验预设值)，该电子水泵最低转速即为满足增压器冷却所需的电子水泵转速。As mentioned above, the intake air temperature and the power consumption of the electronic water pump need to be taken into account during actual control. Under this combination, the engine will spend the minimum power consumption cost to obtain the lowest intake air temperature, so as to achieve optimal fuel consumption. Therefore, the EMS can obtain the current working state of the supercharger based on the engine speed and engine load look-up table. In the present invention, the working state of the supercharger is divided into BIT=0, 1, 2 based on the calibration test at the initial stage of design. 0 represents the low load of the supercharger, 1 represents the medium load, and 2 represents the full load. The essence of these three types of working conditions is the cooling demand of low, medium and high levels. Based on the turbocharger's low, middle and high gear loads, that is, the three states of BIT=0, 1, 2, set the minimum speed of the electronic water pump that matches it respectively, and the minimum speed of the electronic water pump in each state can be based on the engine load The minimum speed of the electronic water pump required for cooling the supercharger under the current working conditions can be obtained from the actual intake air temperature look-up table (the load state of the supercharger and the intake air temperature are the test preset values). Electronic water pump speed required for compressor cooling.
S4，对S3中的满足目标进气温度所需的电子水泵转速和满足增压器冷却所需的电子水泵转速的输出进行下限约束。In S4, a lower limit constraint is imposed on the output of the electronic water pump speed required to meet the target intake air temperature and the electronic water pump speed required to meet the cooling of the supercharger in S3.
电子水泵工作时，在优化进气温度之前，需优先满足增压器的最低冷却需求，故需要对S3和S4中满足目标进气温度所需的电子水泵转速和满足增压器冷却所需的电子水泵转速进行下限约束，二者取大进行输出，以此对电子水泵进行控制。When the electronic water pump is working, prior to optimizing the intake air temperature, the minimum cooling demand of the supercharger needs to be met first. Therefore, it is necessary to determine the speed of the electronic water pump required to meet the target intake air temperature in S3 and S4 and the speed required to meet the cooling requirements of the supercharger. The speed of the electronic water pump is constrained by the lower limit, and the larger of the two is used for output, so as to control the electronic water pump.
S5，若发动机转速低于怠速阈值，则观察设定时刻发动机转速的变化率是否小于0，判断增压器是否需要进行后冷却处理。S5, if the engine speed is lower than the idling threshold, observe whether the change rate of the engine speed at the set time is less than 0, and determine whether the supercharger needs post-cooling treatment.
汽车长时间剧烈驾驶，温度较高时，突然停机，由于电子水泵与转速耦合，也将立刻停机，此时***内无流量，将造成增压器热量在短时间内聚集，导致冷却液出现沸腾现象。故增压器接入中温冷却***后，还需要对热浸工况进行处理。如EMS判断发动机转速低于怠速阈值，则认为此时正在启动，或准备熄火停机，若发动机正在启动则无需额外处理，若发动机正准备熄火停机则需判断是否进行后冷却处理。判断方法如下：此时EMS以固定频率继续观察设定时刻发动机转速变化趋势，如设定时刻t1、t2，则设定变化率＝(t2时刻发动机转速-t1时刻发动机转速)/(t2-t1)，并连续监测三次。When the car is driven vigorously for a long time and the temperature is high, if it stops suddenly, it will also stop immediately due to the coupling between the electronic water pump and the speed. At this time, there is no flow in the system, which will cause the heat of the supercharger to accumulate in a short time, causing the coolant to boil Phenomenon. Therefore, after the supercharger is connected to the medium temperature cooling system, it is necessary to deal with the hot soaking condition. If the EMS judges that the engine speed is lower than the idle threshold, it is considered to be starting at this time, or is about to be shut down. If the engine is starting, no additional processing is required. If the engine is about to be shut down, it needs to judge whether to perform post-cooling treatment. The judgment method is as follows: At this time, the EMS continues to observe the change trend of the engine speed at the set time with a fixed frequency. For example, when the time t1 and t2 are set, the set change rate = (engine speed at t2 - engine speed at t1)/(t2-t1 ), and monitored three times continuously.
S6，若设定时刻发动机转速的变化率大于0，则增压器无需进行后冷却处理，为正常启动状态，若设定时刻发动机转速的变化率小于0，则为发动机处于准备停机状态，需继续观察，直到设定时刻发动机转速的变化率等于0为止。S6, if the rate of change of the engine speed at the set time is greater than 0, the supercharger does not need to perform after-cooling treatment, and it is in a normal startup state; Continue to observe until the rate of change of the engine speed at the set moment is equal to 0.
如三次监测到的变化率均小于0，则认为发动机转速持续下降，准备停机，此时设定停机 状态位等于1，否则为0。又任意状态下，当EMS监测到已经等于0时，亦认为停机完毕，设定停机状态位等于1。当停机状态位等于1时，需判断发动机是处于热态还是冷态，即判断是否有必要对增压器进行后冷却过程。If the rate of change detected three times is less than 0, it is considered that the engine speed continues to drop, and it is ready to stop. At this time, set the stop status bit to 1, otherwise it is 0. In any state, when the EMS detects that it is already equal to 0, it is also considered that the shutdown is complete, and the shutdown status bit is set equal to 1. When the shutdown state bit is equal to 1, it is necessary to judge whether the engine is in a hot state or a cold state, that is, to judge whether it is necessary to perform an after-cooling process on the supercharger.
S7，当设定时刻发动机转速的变化率等于0时，判断此刻发动机水温是否高于后运行阈值，如低于后运行阈值，则电子水泵停机，如高于后运行阈值，则增压器需要进行后冷却处理，确定此时增压器所需的电子水泵转速。S7, when the change rate of the engine speed at the set time is equal to 0, judge whether the engine water temperature is higher than the post-run threshold at the moment, if it is lower than the post-run threshold, the electronic water pump will stop, if it is higher than the post-run threshold, the supercharger needs to Carry out after-cooling treatment, and determine the electronic water pump speed required by the supercharger at this time.
由于一般水温传感器仅在高温冷却***中进行布置，故此时只能依据高温冷却***中的传感器进行判断。因此，EMS继续判断发动机水温是否高于后运行阈值(发动机水温由温度传感器采集所得，后运行阈值为试验预设值)，如低于阈值，则电子水泵停机，如高于则判定增压器需要进行后冷却处理，后冷却需求位等于1，否则为0。Since the general water temperature sensor is only arranged in the high temperature cooling system, it can only be judged based on the sensor in the high temperature cooling system at this time. Therefore, EMS continues to judge whether the engine water temperature is higher than the post-running threshold (the engine water temperature is collected by the temperature sensor, and the post-running threshold is the test preset value). If it is lower than the threshold, the electronic water pump will stop. If it is higher than the supercharger Post-cooling processing is required, and the post-cooling requirement bit is equal to 1, otherwise it is 0.
增压器进行后冷却处理时，则无视其他情形，EMS维持电子水泵继续工作，但此时其转速不再依据发动机工况进行。其转速以及工作时长均基于发动机的水温进行设定，通过查表得到，工作时长一般不超过EMS的后运行许用时长。当后运行时长达到设定值，或如无后冷却需求时，则电子水泵停机，后冷却模式结束。When the supercharger is undergoing post-cooling treatment, other conditions are ignored, and the EMS maintains the electronic water pump to continue to work, but at this time its speed is no longer based on the engine operating conditions. Its speed and working time are set based on the water temperature of the engine. It is obtained by looking up the table, and the working time generally does not exceed the allowable time of post-running of the EMS. When the post-running time reaches the set value, or if there is no post-cooling demand, the electronic water pump will stop and the post-cooling mode ends.
需要说明的是，上述所述的发动机转速、发动机负荷、实际进气温度、发动机水温均为EMS内部采集或计算信号；表格是基于对应的标定实验得到，预先存储于EMS中，怠速阈值、电子水泵初始转速、目标进气温度、P修正量、I修正量、发动机的工况、增压器的工况、后运行阈值、后运行转速、工作时长均可以通过查询预设表格得到。It should be noted that the engine speed, engine load, actual intake air temperature, and engine water temperature mentioned above are all collected or calculated signals inside the EMS; the tables are obtained based on corresponding calibration experiments and stored in the EMS in advance. The initial speed of the water pump, the target intake air temperature, the P correction amount, the I correction amount, the working condition of the engine, the working condition of the supercharger, the post-operation threshold, the post-operation speed, and the working time can all be obtained by querying the preset table.
综上所述，本发明提供的一种增压器冷却控制方法，基于发动机冷却***设计的特点，将增压器冷却***接入发动机的中温冷却***，而非继续留存于高温冷却***，通过中温冷却***中的小功率电子水泵为增压器提供冷却，在非必要的条件下无需新增高功率电子水泵，避免了成本的增加，亦能够在汽车熄火停机之后，避免膨胀水壶内出现沸腾现象。此外，通过本发明的控制方法，在中温冷却***执行电子水泵的控制时，对增压器不同工况进行了区分，约束电子水泵的许用下限，在非必要情况下，无需提升电子水泵的功率。To sum up, the present invention provides a supercharger cooling control method, based on the design characteristics of the engine cooling system, the supercharger cooling system is connected to the engine’s medium-temperature cooling system instead of remaining in the high-temperature cooling system. The low-power electronic water pump in the medium-temperature cooling system provides cooling for the supercharger. Under non-essential conditions, there is no need to add a high-power electronic water pump, which avoids an increase in cost and can also avoid boiling in the expansion kettle after the car is turned off and shut down. Phenomenon. In addition, through the control method of the present invention, when the medium-temperature cooling system executes the control of the electronic water pump, different working conditions of the supercharger are distinguished, and the allowable lower limit of the electronic water pump is restricted. power.
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (10)

  1. 一种增压器冷却控制方法，其中，包括：判断发动机是否处于正常工作状态；A supercharger cooling control method, including: judging whether the engine is in a normal working state;
    若发动机处于正常工作状态，确定当前工况下满足发动机目标进气温度所需的电子水泵转速以及当前工况下满足增压器冷却所需的电子水泵转速，并以满足发动机目标进气温度所需的电子水泵转速和满足增压器冷却所需的电子水泵转速中的较大者进行电子水泵控制；If the engine is in normal working condition, determine the electronic water pump speed required to meet the target intake air temperature of the engine under the current working condition and the electronic water pump speed required to meet the supercharger cooling under the current working condition, and meet the engine target intake air temperature. Electronic water pump control is performed based on the greater of the required electronic water pump speed and the electronic water pump speed required for supercharger cooling;
    若发动机处于非正常工作状态，判断增压器是否需要后冷却处理；If the engine is in an abnormal working state, determine whether the supercharger needs post-cooling treatment;
    若增压器需要后冷却处理，确定满足增压器后冷却处理所需的电子水泵转速。If the supercharger requires post-cooling treatment, determine the electronic water pump speed that meets the requirements of the supercharger post-cooling treatment.
  2. 如权利要求1所述的增压器冷却控制方法，其中，判断发动机是否处于正常工作状态包括：The supercharger cooling control method according to claim 1, wherein judging whether the engine is in a normal working state comprises:
    判断发动机转速是否高于怠速阈值；Determine whether the engine speed is higher than the idle threshold;
    若发动机转速高于怠速阈值，则确认发动机处于正常工作状态；If the engine speed is higher than the idle speed threshold, confirm that the engine is in normal working condition;
    若发动机转速低于怠速阈值，则确认发动机处于非正常工作状态。If the engine speed is lower than the idle speed threshold, it is confirmed that the engine is not working normally.
  3. 如权利要求1所述的增压器冷却控制方法，其中，判断增压器是否需要后冷却处理包括：The supercharger cooling control method according to claim 1, wherein judging whether the supercharger needs post-cooling treatment comprises:
    判断发动机转速的变化率是否小于0；Determine whether the rate of change of the engine speed is less than 0;
    若发动机转速的变化率大于0，则判定增压器无需进行后冷却处理；If the rate of change of the engine speed is greater than 0, it is determined that the supercharger does not need after-cooling treatment;
    若发动机转速的变化率等于0时，则判断发动机水温是否高于后运行阈值；If the rate of change of the engine speed is equal to 0, it is judged whether the engine water temperature is higher than the post-run threshold;
    若发动机水温低于后运行阈值，则电子水泵停机；If the engine water temperature is lower than the post-run threshold, the electronic water pump will stop;
    若发动机水温高于后运行阈值，则确定增压器需要进行后冷却处理。If the engine water temperature is higher than the post-running threshold, it is determined that the supercharger needs post-cooling treatment.
  4. 如权利要求1所述的增压器冷却控制方法，其中，在判断发动机是否处于正常工作状态之前还包括：The supercharger cooling control method according to claim 1, wherein, before judging whether the engine is in a normal working state, it also includes:
    ***自检，自检对象包括发动机各个***的传感器和执行器；System self-inspection, self-inspection objects include sensors and actuators of each system of the engine;
    如***一切正常，则进行增压器冷却控制，如***异常则报警，发动机限扭。If everything in the system is normal, the supercharger cooling control will be carried out, and if the system is abnormal, an alarm will be issued, and the engine torque will be limited.
  5. 如权利要求1所述的增压器冷却控制方法，其中，确定发动机不同工况下的满足目标进气温度所需的电子水泵转速包括：The supercharger cooling control method according to claim 1, wherein determining the electronic water pump speed required to meet the target intake air temperature under different engine operating conditions comprises:
    根据当前发动机转速及发动机负荷确定发动机当前所处工况；Determine the current working condition of the engine according to the current engine speed and engine load;
    基于当前工况查表得到当前工况对应的目标进气温度以及电子水泵初始转速；Obtain the target intake air temperature and the initial speed of the electronic water pump corresponding to the current working condition by looking up the table based on the current working condition;
    基于实际进气温度与目标进气温度之间的温差对电子水泵的转速进行PID闭环控制，直至实际进气温度与目标进气温度之间吻合。Based on the temperature difference between the actual intake air temperature and the target intake air temperature, the PID closed-loop control is performed on the speed of the electronic water pump until the actual intake air temperature coincides with the target intake air temperature.
  6. 如权利要求5所述的增压器冷却控制方法，其中，基于实际进气温度与目标进气温度之间的温差对电子水泵的转速进行PID闭环控制时依据的计算公式为：The supercharger cooling control method according to claim 5, wherein the calculation formula based on the PID closed-loop control of the speed of the electronic water pump based on the temperature difference between the actual intake air temperature and the target intake air temperature is:
    当前工况下的满足目标进气温度所需的电子水泵转速＝电子水泵初始转速+P+I*t，其中P修正量为单次修正量，I修正量随时间t逐渐累积。The electronic water pump speed required to meet the target intake air temperature under the current working condition = the initial speed of the electronic water pump + P + I*t, where the P correction amount is a single correction amount, and the I correction amount gradually accumulates with time t.
  7. 如权利要求5所述的增压器冷却控制方法，其中，当前所处的工况包括高、中、低三种工况。The supercharger cooling control method according to claim 5, wherein the current working conditions include three working conditions: high, medium and low.
  8. 如权利要求1所述的增压器冷却控制方法，其中，确定当前工况下增压器冷却所需的电子水泵转速包括：The supercharger cooling control method according to claim 1, wherein determining the speed of the electronic water pump required for supercharger cooling under the current working condition comprises:
    基于发动机转速以及发动机负荷得到当前增压器的工况；Obtain the current working condition of the supercharger based on the engine speed and engine load;
    基于增压器负荷、实际进气温度查表得到当前工况下增压器冷却所需的电子水泵最低转速，该转速即为当前工况下增压器不过热所需的电子水泵转速。Based on the supercharger load and the actual intake air temperature, the minimum speed of the electronic water pump required for supercharger cooling under the current working condition is obtained from the table lookup, which is the speed of the electronic water pump required for the supercharger not to overheat under the current working condition.
  9. 如权利要求3所述的增压器冷却控制方法，其中，设定时刻t1、t2，以固定频率观察设定时刻t1、t2发动机转速的变化趋势，则发动机转速的变化率＝(t2时刻发动机转速-t1时刻发动机转速)/(t2-t1)，并连续监测三次。The supercharger cooling control method as claimed in claim 3, wherein the time t1 and t2 are set, and the change trend of the engine speed at the set time t1 and t2 is observed with a fixed frequency, then the rate of change of the engine speed=(engine at time t2 Speed - engine speed at time t1)/(t2-t1), and continuously monitored three times.
  10. 如权利要求1所述的增压器冷却控制方法，其中，满足增压器后冷却处理时的电子水泵转速基于当前发动机的水温查表确定，若发动机的工作时长达到设定值时，后冷却模式结束，发动机的工作时长基于当前发动机的水温查表确定。The supercharger cooling control method as claimed in claim 1, wherein the electronic water pump speed is determined based on the water temperature look-up table of the current engine when the post-cooling treatment of the supercharger is satisfied. When the mode ends, the working hours of the engine are determined based on the current engine water temperature look-up table.
PCT/CN2022/122601 2021-11-22 2022-09-29 Cooling control method for supercharger WO2023087945A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10022967A1 (en) * 2000-05-11 2001-11-22 Daimler Chrysler Ag Liquid cooled exhaust gas turbocharger with independent cooling system with pump driven by electric motor rather than engine
CN105673186A (en) * 2016-01-28 2016-06-15 奇瑞汽车股份有限公司 Cooling system of turbocharger and control method thereof
CN106014610A (en) * 2016-05-14 2016-10-12 奇瑞汽车股份有限公司 Control system of electronic water pump for turbo-supercharged engine and control method of control system of electronic water pump for turbo-supercharged engine
EP3124765A2 (en) * 2015-07-31 2017-02-01 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Cooling control device
CN113027599A (en) * 2021-03-30 2021-06-25 一汽奔腾轿车有限公司 Cooling system of post-operation supercharger and control method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10022967A1 (en) * 2000-05-11 2001-11-22 Daimler Chrysler Ag Liquid cooled exhaust gas turbocharger with independent cooling system with pump driven by electric motor rather than engine
EP3124765A2 (en) * 2015-07-31 2017-02-01 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Cooling control device
JP2017031871A (en) * 2015-07-31 2017-02-09 三菱自動車工業株式会社 Cooling control device
CN105673186A (en) * 2016-01-28 2016-06-15 奇瑞汽车股份有限公司 Cooling system of turbocharger and control method thereof
CN106014610A (en) * 2016-05-14 2016-10-12 奇瑞汽车股份有限公司 Control system of electronic water pump for turbo-supercharged engine and control method of control system of electronic water pump for turbo-supercharged engine
CN113027599A (en) * 2021-03-30 2021-06-25 一汽奔腾轿车有限公司 Cooling system of post-operation supercharger and control method thereof

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