CN111608813B - Engine exhaust temperature management method and device and engine - Google Patents

Abstract

The invention discloses an engine exhaust temperature management method, an engine exhaust temperature management device and an engine, wherein the method comprises the steps of obtaining working information of the current engine, determining the ignition frequency of the engine according to the working information, and determining whether the engine needs to carry out exhaust temperature coordination control on a coordination control component or not based on the ignition frequency and the working information to obtain an exhaust temperature coordination control request flag bit; determining coordination control information of the coordination control component according to the temperature-exhaust coordination control request zone bit and the working information; determining a closed-loop control instruction based on the coordination control information and the working information; and driving the corresponding coordination control component to act based on the closed-loop control instruction, the working information and the coordination control information. The method and the device have the advantages that the technical effect that the exhaust temperature of the engine is accurately managed to meet the temperature requirement of the aftertreatment system on the premise that the oil consumption of the engine is not increased or the oil consumption of the engine is slightly increased is achieved.

Description

Engine exhaust temperature management method and device and engine

Technical Field

The embodiment of the invention relates to the technical field of engines, in particular to an engine exhaust temperature management method and device and an engine.

Background

The existing exhaust temperature control methods for engines generally use the following methods:

1. a post-injection process using a fuel system, a hydrocarbon injector, and a heating device configured to heat the exhaust gas in the particulate filter, wherein the energy provided is based on an expected temperature at a selected location in the exhaust system, a flow rate of the exhaust gas, a temperature of the exhaust gas received by the exhaust system, a flow rate of the exhaust gas at an inlet of the oxidation catalyst, and a temperature of the exhaust gas at an inlet of the oxidation catalyst.

2. Receiving the detected exhaust temperature of the engine, and correcting the air inflow set value of the throttle valve based on the exhaust temperature if the exhaust temperature is lower than a first threshold; the corrected air inflow set value is smaller than the air inflow set value before correction, and the lower the exhaust temperature is, the smaller the corrected air inflow set value is; and controlling the opening of a throttle valve of the engine based on the difference between the corrected air inflow set value and the actual air inflow of the throttle valve.

3. Determining an exhaust temperature demand based on an engine parameter; determining an exhaust temperature differential when the exhaust temperature measurement is less than the exhaust temperature demand; determining a throttle position demand based on the engine parameters, the exhaust temperature demand, the exhaust temperature difference, and the calculation constant; determining a drive current demand value based on the throttle position demand value and the throttle position measurement value; and controlling the air inlet throttle valve control motor to reduce the opening of the air inlet throttle valve according to the parameters of the control motor and the driving current demand value.

4. The temperature sensor is used for acquiring the temperature value of the DPF system in real time and transmitting the temperature value to the electronic control unit, the electronic control unit calculates the fuel injection quantity required for adjusting the current temperature of the DPF filter to the target temperature through an open-loop control algorithm and a closed-loop PID control algorithm according to the temperature value and converts the fuel injection quantity into a corresponding pulse width signal to drive the fuel control valve, so that the accurate control of the fuel injection quantity in front of the DOC catalyst is realized, the exhaust temperature of an engine is controlled, and the temperature of the DPF filter is further controlled.

The prior art mainly has the following defects:

1. the exhaust temperature is controlled by using a single throttle valve, the controllable temperature range is narrow, and the requirement of an aftertreatment system on exhaust temperature increase cannot be met frequently; in addition, the reduction of the air intake amount through the throttling of the throttle valve can increase the pumping loss of the engine and reduce the fuel economy of the engine;

2. raising the exhaust temperature at the inlet of the oxidation catalyst using the post-injection process alone can cause significant degradation in the fuel economy of the engine;

3. the existing cylinder tripping technology or variable displacement technology cannot carry out quantitative control on the exhaust temperature; exhaust temperature management is not coordinated with other engine components.

Disclosure of Invention

The invention provides an engine exhaust temperature management method, which realizes the technical effect of accurately managing the exhaust temperature of an engine to meet the temperature requirement of an aftertreatment system on the premise of not increasing the oil consumption of the engine or slightly increasing the oil consumption of the engine.

The embodiment of the invention provides an engine exhaust temperature management method, which comprises the following steps:

acquiring working information of a current engine, determining ignition frequency of the engine according to the working information, and determining whether the engine needs to carry out temperature-discharging coordination control on a coordination control component based on the ignition frequency and the working information to obtain a temperature-discharging coordination control request flag bit, wherein the working information of the engine comprises required torque, engine rotating speed, target exhaust temperature, actual exhaust temperature and a temperature-discharging management request flag bit;

determining coordination control information of the coordination control component according to the temperature-removal coordination control request flag bit and the working information, wherein the coordination control information of the coordination control component comprises: a coordination component activation status word, an activation component control mode status word, and a closed-loop control sequence status word;

determining a closed-loop control instruction based on the coordinated control information and the working information;

and driving the corresponding coordination control component to act based on the closed-loop control instruction, the working information and the coordination control information.

Further, the determining a firing frequency of the engine based on the operating information includes:

if the temperature exhaust management request flag bit is 0, inquiring a first lookup table based on the required torque and the engine rotating speed to determine the ignition frequency;

if the exhaust temperature management request flag bit is 1, inquiring a second lookup table based on the required torque, the engine speed and the target exhaust temperature to determine an open-loop control value of the ignition frequency, determining a closed-loop control value of the ignition frequency based on the open-loop control value, the target exhaust temperature and the actual exhaust temperature, and determining the ignition frequency based on the closed-loop control value.

Further, the determining a closed-loop control value for the firing frequency based on the open-loop control value, the target exhaust temperature, and the actual exhaust temperature, and the determining the firing frequency based on the closed-loop control value includes:

the target exhaust temperature and the actual exhaust temperature are subjected to closed-loop control, and then the closed-loop control value of the ignition frequency is obtained by adding the open-loop control value;

and adjusting the closed-loop control value of the ignition frequency through an ignition frequency limiting module to obtain the ignition frequency.

Further, the determining a closed-loop control command based on the coordinated control information and the operational information comprises:

determining an upper limit value of a controller output based on the coordination component activation status word and the activation component control mode status word;

determining the closed-loop control command based on the target exhaust temperature, the actual exhaust temperature, and an upper limit value output by the controller.

Further, the determining an upper limit value for a controller output based on the coordinating component activation status word and the activation component control mode status word comprises:

performing bitwise AND operation on the coordination component activation state word and the activation component control mode state word, and converting a calculation result into a binary numerical value;

and counting the number of '1' contained in the secondary system value, wherein the number of '1' is the upper limit value output by the controller.

Further, the driving the corresponding coordinated control component action based on the closed-loop control instruction, the working information and the coordinated control information comprises:

determining a coordination control component adopting a closed-loop control mode and a coordination control component adopting an open-loop control mode according to the coordination component activation state word and the activation component control mode state word;

determining the execution sequence of the coordination control component adopting a closed-loop control mode according to the closed-loop control sequence state word;

sequentially carrying out drive control on the coordination control components adopting a closed-loop control mode according to the closed-loop control instructions;

and inquiring a third lookup table according to the working information to determine a driving instruction of the coordination control component adopting an open-loop control mode, and performing driving control on the coordination control component adopting the open-loop control mode.

An embodiment of the present invention further provides an engine exhaust temperature management device, including:

the ignition frequency management module is used for acquiring the working information of the current engine, determining the ignition frequency of the engine according to the working information, and determining whether the engine needs to carry out exhaust temperature coordination control on a coordination control component or not based on the ignition frequency and the working information to obtain an exhaust temperature coordination control request flag bit, wherein the working information of the engine comprises required torque, engine rotating speed, target exhaust temperature, actual exhaust temperature and an exhaust temperature coordination control request flag bit;

a coordination component control configuration module, configured to determine coordination control information of the coordination control component according to the temperature removal coordination control request flag bit and the working information, where the coordination control information of the coordination control component includes: coordinating component activation status words, activation component control mode status words, and closed-loop control sequence status words;

a coordination component closed-loop control module for determining a closed-loop control instruction based on the coordination control information and the working information;

and the coordination component execution module is used for driving the corresponding coordination control component to act based on the closed-loop control instruction, the working information and the coordination control information.

Further, the firing frequency management module includes:

a first determination submodule, configured to query a first lookup table based on the required torque and the engine speed to determine the ignition frequency if the exhaust temperature management request flag is 0;

and a second determination submodule, configured to, if the exhaust temperature management request flag is 1, query a second lookup table based on the required torque, the engine speed, and the target exhaust temperature to determine an open-loop control value of the ignition frequency, determine a closed-loop control value of the ignition frequency based on the open-loop control value, the target exhaust temperature, and the actual exhaust temperature, and determine the ignition frequency based on the closed-loop control value.

Further, the coordinating component closed-loop control module comprises:

a third determination submodule, configured to determine an upper limit value output by the controller based on the coordination component activation status word and the activation component control manner status word;

a fourth determination submodule configured to determine the closed-loop control command based on the target exhaust temperature, the actual exhaust temperature, and an upper limit value output by the controller.

Embodiments of the present invention also provide an engine using a method for managing engine exhaust gas temperature as claimed in any of the embodiments of the present invention.

The invention discloses an engine exhaust temperature management method, an engine exhaust temperature management device and an engine, wherein the method comprises the steps of obtaining working information of the current engine, determining the ignition frequency of the engine according to the working information, and determining whether the engine needs to carry out exhaust temperature coordination control on a coordination control component or not based on the ignition frequency and the working information to obtain an exhaust temperature coordination control request flag bit; determining coordination control information of the coordination control component according to the temperature-discharging coordination control request zone bit and the working information; determining a closed-loop control instruction based on the coordinated control information and the working information; and driving the corresponding coordination control component to act based on the closed-loop control instruction, the working information and the coordination control information. The method and the device achieve the technical effect of accurately managing the exhaust temperature of the engine to meet the temperature requirement of the aftertreatment system on the premise of not increasing the oil consumption of the engine or slightly increasing the oil consumption of the engine.

Drawings

FIG. 1 is a block diagram of a six cylinder diesel engine provided by an embodiment of the present invention;

FIG. 2 is a flow chart of a method of managing engine exhaust temperature according to an embodiment of the present invention;

FIG. 3 is a functional block diagram of an engine exhaust temperature management method according to an embodiment of the present invention;

FIG. 4 is a block diagram of computational logic for determining firing frequency provided by embodiments of the present invention;

FIG. 5(a) is a block diagram of a flow chart for determining a control command by looking up a table according to an embodiment of the present invention;

FIG. 5(b) is a block diagram of a flow chart of another table lookup determination control instruction according to an embodiment of the present invention;

fig. 5(c) is a block diagram of a flow chart of determining a control instruction via a neural network according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

It should be noted that the terms "first", "second", and the like in the description and claims of the present invention and the accompanying drawings are used for distinguishing different objects, and are not used for limiting a specific order. The following embodiments of the present invention may be implemented individually, or in combination with each other, and the embodiments of the present invention are not limited in this respect.

The invention is suitable for various engines, including diesel engines, gasoline engines, natural gas engines and the like, and FIG. 1 is a structural diagram of a six-cylinder diesel engine provided by an embodiment of the invention. For example, referring to fig. 1, in a normal ignition operation, a mixture of fresh air cooled by a cooler 020 in a supercharger after passing through a variable-section turbocharger 010 and exhaust gas mixed by an exhaust gas recirculation valve 080 in an intake manifold enters an engine cylinder through an intake valve 030 in an intake stroke; the low-pressure fuel in the oil tank is pressurized by the high-pressure oil pump through the high-pressure oil pump control valve 090 and then is sent into the common rail pipe 091, and the rail pressure sensor 092 can measure the fuel pressure in the common rail pipe 091 in real time; the fuel injector 040 receives high-pressure fuel from the common rail 091 through the high-pressure fuel pipe, and when the piston moves to the position near the top dead center in the compression stroke of the engine, the high-pressure fuel is injected into the cylinder of the engine to be mixed with high-pressure mixed gas inside the cylinder of the engine, compression ignition is performed to release energy in the power stroke of the engine, and the piston is pushed to move downwards to do work to generate output torque. During the exhaust stroke of the engine, the cylinder interior gas enters the exhaust pipe through the exhaust valve 050, and the temperature of the exhaust gas can be measured by the exhaust temperature sensor 060. A part of exhaust gas can push a turbine of the variable-section turbocharger 010, so that an intake air supercharging function is realized, then the exhaust gas enters the aftertreatment equipment, and finally the exhaust gas is exhausted into the atmosphere; the remaining exhaust gas is cooled by the egr cooler 070 and then mixed with fresh air in the intake manifold via the egr valve 080. During the flashover operation, the intake valve 030 is closed during the intake stroke to prevent the mixture in the intake manifold from entering the cylinder; during the compression stroke, the injector 040 prohibits injection when the piston moves near the top dead center position; the exhaust valve 050 remains closed during the exhaust stroke.

In order to meet current emission standards, engine manufacturers typically place a large number of after-treatment devices, such as DPFs (diesel particulate filters), SCRs (selective catalytic reduction technologies), etc., in the engine exhaust line. In order to better remove pollutants from the exhaust gas and to enable the aftertreatment device to be in a state of high conversion efficiency, certain requirements on the temperature of the exhaust gas are required. During the operation of the engine in a small load condition immediately after starting or for a long time, the exhaust temperature of the engine is very low, and the aftertreatment equipment is difficult to exert the proper function of reducing pollutants in the exhaust gas, so that an exhaust temperature management request is sent out, and a target exhaust temperature is provided.

FIG. 2 is a flow chart of a method for engine exhaust temperature management according to an embodiment of the present invention. FIG. 3 is a functional block diagram of an engine exhaust temperature management method according to an embodiment of the present invention.

As shown in fig. 2 and 3, the engine exhaust temperature management method specifically includes the steps of:

step S101, acquiring working information of the current engine, determining an ignition frequency of the engine according to the working information, and determining whether the engine needs to perform exhaust temperature coordination control on a coordination control component based on the ignition frequency and the working information to obtain an exhaust temperature coordination control request flag bit 220, wherein the working information of the engine comprises a required torque 110, an engine rotating speed 120, a target exhaust temperature 130, an actual exhaust temperature 140 and an exhaust temperature management request flag bit 150.

Specifically, referring to fig. 3, the firing frequency management module 001 can obtain the current engine operating information, which specifically includes the following signals: the required torque 110, the engine speed 120, the target exhaust temperature 130, the actual exhaust temperature 140, and the exhaust temperature management request flag 150 may take values of 120Nm, 1000rpm, 250 ℃, 150 ℃, 1, respectively. The ignition frequency management module 001 firstly determines the ignition frequency of the engine according to the acquired working information, the exhaust temperature of the engine can be increased when the engine jumps based on the ignition frequency, after the ignition frequency is determined, whether the engine can jump based on the ignition frequency to reach the required exhaust temperature needs to be judged according to the obtained ignition frequency, if the engine can jump based on the ignition frequency, the value of the exhaust temperature management request flag bit 150 is 0, namely, other coordination control components are not needed to carry out exhaust temperature coordination control, and at the moment, the exhaust temperature of the engine meets the temperature requirement of the post-processing system without increasing the oil consumption of the engine; if the spark-over based on the frequency cannot reach the required exhaust temperature, the value of the exhaust temperature management request flag 150 is 1, that is, other coordinated control components are required to perform exhaust temperature coordinated control to raise the exhaust temperature, and at this time, a small amount of oil consumption of the engine needs to be increased to enable the other coordinated control components to act to meet the temperature requirement of the aftertreatment system.

Fig. 4 is a logic diagram of a calculation for determining an ignition frequency according to an embodiment of the present invention.

Optionally, in step S101, determining the firing frequency 210 of the engine based on the operation information specifically includes:

step S1011, if the exhaust temperature management request flag 150 is 0, querying the first lookup table 602 based on the required torque 110 and the engine speed 120 to determine the ignition frequency 210;

in step S1012, if the exhaust temperature management request flag 150 is 1, the second lookup table 603 is queried based on the required torque 110, the engine speed 120, and the target exhaust temperature 130 to determine an open-loop control value for the firing frequency, the closed-loop control value for the firing frequency 210 is determined based on the open-loop control value, the target exhaust temperature 130, and the actual exhaust temperature 140, and the firing frequency 210 is determined based on the closed-loop control value.

Specifically, referring to fig. 4, when there is no exhaust temperature management request, that is, when the exhaust temperature management request flag 150 is 0, the first lookup table 602 may be queried according to the required torque 110 and the engine speed 120 to obtain an open-loop control value of the ignition frequency 210 as the ignition frequency of the current engine, and the output of the exhaust temperature coordination control request flag 220 is 0; when there is a request for exhaust temperature management, that is, when the flag 150 of the request for exhaust temperature management is 1, the open-loop control value of the ignition frequency 210 obtained by querying the second lookup table 603 according to the required torque 110 and the engine speed 120 is used as an output, and the output value obtained by performing closed-loop control on the difference between the target exhaust temperature 130 and the actual exhaust temperature 140 is used as the control original value of the ignition frequency 210.

When the original control value of the ignition frequency 210 falls into the area where the current working condition is forbidden to work, selecting the corresponding allowable ignition frequency as the ignition frequency control value nearby; otherwise, the original control value of the firing frequency 210 is used as the firing frequency control value; when the ignition frequency control value is smaller than the lower limit value of the ignition frequency 210 under the current working condition, the module outputs the lower limit value as the ignition frequency 210 of the current engine, and the output of the exhaust temperature coordination control request mark 220 is 1; otherwise, the module outputs the minimum value of the ignition frequency control value and the upper limit value of the ignition frequency 210 under the current working condition as the ignition frequency of the current engine, and the output of the exhaust temperature coordination control request mark 220 is 0.

Alternatively, the step S1052 of determining a closed-loop control value for the firing frequency 210 based on the open-loop control value, the target exhaust temperature 130, and the actual exhaust temperature 140, and the determining the firing frequency 210 based on the closed-loop control value includes: the target exhaust temperature 130 and the actual exhaust temperature 140 are closed-loop controlled and then added with an open-loop control value to obtain a closed-loop control value of the firing frequency 210; the closed loop control value of the firing frequency 210 is adjusted by the firing frequency limit module 702 to obtain the firing frequency 210.

Specifically, referring to fig. 3 and 4, when there is no exhaust temperature management request, i.e. the value of the exhaust temperature management request flag 150 is 0, the ignition frequency 210 of the current engine is directly obtained by querying the first lookup table 602 according to the current operating condition, i.e. the required torque 110 and the engine speed 120.

When the value of the exhaust temperature management request flag 150 is 1, first, a second lookup table 603 is queried according to the current working condition, that is, according to the required torque 110, the engine speed 120, and the target exhaust temperature 130 to obtain an open-loop control value of the ignition frequency, and then the closed-loop control value of the ignition frequency obtained by performing PID control (that is, through a PID control module 701) by adding the feedback of the target exhaust temperature 130 and the actual exhaust temperature 140 to the obtained open-loop control value is obtained, and then, after the adjustment of the ignition frequency limiting module 702, the final result of the ignition frequency 210 of the current engine is obtained. The firing frequency limit module 702 mainly implements two functions, one of which is the exclusion of the forbidden range of the firing frequency 210; the second is the limit of the upper and lower limits of the firing frequency 210.

For example, the upper and lower limits of the ignition frequency 210 may be simply obtained by looking up a table according to the current operating condition. For example, under a certain condition, the achievable ignition frequency is as shown in table 1, the ignition frequency 210 of the shaded background portion is the prohibited operating range of the current condition, assuming that the upper and lower limit values of the ignition frequency 210 are 1/6 and 1 respectively, the ignition frequency 210 calculated through open-loop and closed-loop control is 0.4, at this time, the achievable ignition frequency 210 is 5/12, but the ignition frequency 210 falls into the prohibited operating range, so 1/2 can be taken as the ignition frequency 210 of the current engine. The current engine firing frequency 210 is greater than the lower firing frequency limit 1/6, and therefore, the exhaust temperature coordination control request flag 220 is set to 0.

TABLE 1 ignition frequency limit module value-taking table

Step S102, determining coordination control information of a coordination control component according to the temperature-discharging coordination control request flag bit 220 and the working information, wherein the coordination control information of the coordination control component comprises: a coordination component activation status word 310, an activation component control mode status word 320, and a closed loop control sequence status word 330.

Specifically, referring to fig. 2 and fig. 3, the coordination component control configuration module 002 can receive the signal of the exhaust temperature coordination control request flag 220 and the signal of the operation information output by the firing frequency management module 001, and the coordination component control configuration module 002 determines the coordination control information of the coordination control component according to the required torque 110, the engine speed 120, the target exhaust temperature 130, the actual exhaust temperature 140 in the operation information and the exhaust temperature coordination control request flag 220, that is, determines the coordination control component to be activated and the corresponding control manner thereof, and sequences the execution sequence of the activated coordination control component adopting the closed-loop control manner. Illustratively, when there is no coordinated exhaust temperature control request, i.e., the coordinated exhaust temperature control request flag 220 is 0, the coordinated component activation status word 310, the activated component control mode status word 320, and the closed-loop control sequence status word 330 are all output as 0.

When there is a coordinated exhaust temperature control request, that is, when the coordinated exhaust temperature control request flag 220 is 1, it is assumed that there are 4 types of coordinated component actuators, and the coordinated component activation status word 310 may be obtained by looking up a table according to the operating condition and the target exhaust temperature 130, specifically, the value of the coordinated component activation status word 310 may be an 8-bit unsigned integer, and the nth (n >0) bits of the binary system thereof respectively represent the activated states of the coordinated component actuators n (in this embodiment, there are 4 coordinated component actuators, and n is 4). For example, if the value of the coordination unit activation status word 310 is 10, the binary number thereof is 00001010, which represents that the coordination actuator unit 2 and the coordination actuator unit 4 are activated and participate in the coordination control of the exhaust temperature; if the value of the coordinate unit activation status word 310 is 5, its binary number is 00000101, indicating that the coordinate actuator unit 1 and the coordinate actuator unit 3 are activated and participating in the coordinated control of the exhaust temperature.

The activated component control mode status word 320 may be derived from a look-up table based on operating conditions and the target exhaust temperature 130, and may be an 8-bit unsigned integer whose nth bit in the binary system represents whether the coordinated component actuator n is performing closed-loop control. For example, the value of the activation component control mode status word 320 is 1, which represents that the coordination actuator component 1 is in closed-loop control, and the remaining coordination actuator components are in open-loop control.

The closed loop control sequence status word 330 may be derived from a look-up table of operating conditions and target exhaust temperature 130 and may be an 8-bit unsigned integer representing the meaning shown in table 2.

TABLE 2 closed-loop control sequence state word calculation logic table

Closed loop control sequential state word 330	Execution order 1	Execution order 2	Execution order 3	Execution order 4
					0	NA.	NA.	NA.	NA.
1	Coordination actuator component 1	Coordinated actuator component 2	Coordination actuator component 3	Coordination actuator component 4
					2	Coordinated actuator component 1	Coordination actuator component 2	Coordination actuator component 4	Coordination actuator component 3
3	Coordination actuator component 1	Coordination actuator component 3	Coordinated actuator component 2	Coordination actuator component 4
					24	Coordination actuator component 4	Coordination actuator component 3	Coordination actuator component 2	Coordinated actuator component 1

If the values of the coordination component activation state word 310, the activation component control mode state word 320 and the closed-loop control sequence state word 330 are 15, 13 and 3 respectively, it indicates that 4 coordination component actuators are all in an activation state, the coordination component actuator 2 adopts open-loop control, the other coordination component actuators adopt closed-loop control, and the closed-loop control sequence is the coordination actuator component 1, the coordination actuator component 3 and the coordination actuator component 4.

Step S103, determining a closed-loop control instruction based on the coordination control information and the working information.

Referring to fig. 2 and 3, the orchestration part closed-loop control module 003 can receive orchestration control information output by the orchestration part control configuration module 002 and operation information output by the firing frequency management module 001, and specifically, the orchestration part closed-loop control module 003 can determine the closed-loop control command 410 based on the orchestration part activation status word 310 and the activated part control mode status word 320 in the orchestration control information, and the target exhaust temperature 130 and the actual exhaust temperature 140 in the operation information.

Optionally, in step S103, determining a closed-loop control command based on the coordination control information and the working information includes the following steps:

step S1031, determining an upper limit value of the controller output based on the coordination component activation status word 310 and the activation component control manner status word 320;

in step S1032, the closed-loop control command 410 is determined based on the target exhaust temperature 130, the actual exhaust temperature 140, and the upper limit value output by the controller.

Optionally, in step S1031, determining the upper limit value output by the controller based on the coordination component activation status word and the activation component control manner status word includes: performing bitwise and operation on the coordination unit activation state word 310 and the activation unit control mode state word 320, and converting the calculation result into a binary value; and counting the number of '1' contained in the secondary system value, wherein the number of '1' is the upper limit value output by the controller.

Specifically, the coordination unit activation state word 310 and the activation unit control mode state word 320 are subjected to bitwise and operation, the calculation result is converted into a binary numerical value, and then the number of "1" included in the secondary numerical value is counted, and the number of "1" is the upper limit value output by the controller.

After the upper limit value output by the controller is obtained, the target exhaust temperature 130 and the actual exhaust temperature 140 are respectively used as the input quantity and the feedback quantity of a closed-loop controller, the result of the closed-loop controller is limited by a limit module to obtain a closed-loop control instruction 410 with the final output numerical value range from 0 to the upper limit value, the lower limit value of the limit module is 0, and the upper limit value is the upper limit value output by the controller. The closed-loop controller may be a PID (proportional integral derivative) controller, a modified PID controller, a fuzzy controller, an ADRC (active disturbance rejection controller) controller, etc., and is not limited herein.

And step S104, driving corresponding coordination control components to act based on the closed-loop control command 410, the working information and the coordination control information.

Referring to fig. 2 and 3, the coordination component execution module 004 can receive the closed-loop control command 410 output by the coordination component closed-loop control module 003, the coordination control information output by the coordination component control configuration module 002, and the work information output by the firing frequency management module 001, and drive the corresponding coordination control component to operate based on the received information, for example, the closed-loop control components 1 to n respectively represent the first to nth driven components that are sequentially driven; the driving instruction of the closed-loop control part n is equal to the result of subtracting (n-1) from the closed-loop control instruction 410 sent by the closed-loop control module 003 of the coordinating part and taking the maximum value of zero; the actual driving command of the closed-loop control part n is equal to the control value obtained by the driving command through table lookup and the like. Then, the actual driving command of the coordinating component activated and adopting the open-loop control is determined by table look-up and the like according to the engine working information respectively.

Specifically, the coordinating component execution module 004 drives the corresponding coordinating control component actions based on the required torque 110, the engine speed 120, the target exhaust temperature 130, the actual exhaust temperature 140 in the operation information, the coordinating component activation status word 310, the activating component control mode status word 320, the closed-loop control sequence status word 330, and the closed-loop control command 410 in the coordinating control information.

Optionally, in step S104, driving the corresponding coordination control component action based on the closed-loop control command 410, the operation information, and the coordination control information includes: determining a coordination control component adopting a closed-loop control mode and a coordination control component adopting an open-loop control mode according to the coordination component activation state word 310 and the activation component control mode state word 320; determining an execution order of the cooperative control element in a closed-loop control manner according to the closed-loop control order status word 330; sequentially performing drive control on the coordination control components adopting the closed-loop control mode according to the closed-loop control instruction 410; and inquiring the third lookup table according to the working information to determine a driving instruction of the coordination control component adopting the open-loop control mode, and performing driving control on the coordination control component adopting the open-loop control mode.

Specifically, firstly, the coordinated control component adopting the closed-loop control mode and the coordinated control component adopting the open-loop control mode are determined according to the coordinated component activation state word 310 and the activation component control mode state word 320, then the execution sequence of the coordinated control component adopting the closed-loop control mode is determined according to the closed-loop control sequence state word 330, then the coordinated control component adopting the closed-loop control mode is controlled in sequence according to the closed-loop control instruction 410, and finally the driving instruction of each coordinated control component adopting the open-loop control mode is determined by inquiring a third table look-up table and the like according to the working information. The following lookup tables 604, 605, 606, and the like are all the third lookup tables.

For example, referring to fig. 1 and 3, it is assumed that there are four coordinated control components 1 to 4 respectively representing the variable-section turbocharger 010, the injector 040, the egr valve 080, and the high-pressure oil pump control valve 090, and the actual drive commands respectively correspond to the boost pressure 510, the post-injection oil quantity 520, the valve opening 530, and the target rail pressure 540.

If the coordination component activation state word 310, the activation component control mode state word 320, the closed-loop control sequence state word 330 and the closed-loop control instruction 410 are 14, 6, 3 and 1.3 respectively, the activated coordination control components include an oil injector 040, an exhaust gas recirculation valve 080 and a high-pressure oil pump control valve 090, the coordination control components adopting the closed-loop control mode include the oil injector 040 and the exhaust gas recirculation valve 080, and the closed-loop control components 1-2 are the exhaust gas recirculation valve 080 and the oil injector 040 respectively. The control command 531 of the egr valve 080 is 1, and the control command 521 of the injector 040 is 0.3.

Fig. 5(a) is a flow chart of determining a control command by looking up a table according to an embodiment of the present invention.

Fig. 5(b) is a block diagram of a flow chart of another table lookup determination control instruction according to an embodiment of the present invention.

As shown in fig. 5(a), the opening 530 of the exhaust gas recirculation valve is 100% according to the table lookup 604 of the control command 531 of the exhaust gas recirculation valve 080, and as shown in fig. 5(b), the maximum post-injection quantity under the current operating condition is obtained according to the required torque 110 and the engine speed 120, the table lookup 605 is multiplied by a coefficient obtained according to the table lookup 606 of the control command 521 of the injector 040, and the post-injection quantity 520 is 56 mg/stk.

Fig. 5(c) is a block diagram of a flow chart of determining a control instruction via a neural network according to an embodiment of the present invention.

The component adopting open-loop control is a high-pressure oil pump control valve 090, and the target rail pressure 540 can be obtained by table look-up and the like according to the working condition information, the target exhaust temperature 130 and the like. Alternatively, as shown in fig. 5(c), a target rail pressure 540 may also be obtained by the artificial neural network 703 according to the required torque 110, the engine speed 120, the target exhaust temperature 130, and the actual exhaust temperature 140.

Compared with the traditional exhaust temperature management method, the exhaust temperature of the engine is quantitatively controlled under the constraint conditions of meeting the engine dynamic property, emission performance and NVH (Noise, Vibration, Harshness Noise, Vibration and Harshness) performance by mainly controlling the ignition frequency of the engine and coordinating other engine components (an intake pressure control component, an exhaust gas recirculation control component, a fuel injection component, a fuel pressure control component and the like). Compared with the traditional exhaust temperature management method, the method mainly has the following advantages: firstly, in the operation of raising the exhaust temperature of the engine, the fuel consumption of the engine can be effectively reduced, and the emission of HC and CO2 can be reduced; secondly, the requirement of an aftertreatment system on the exhaust temperature can be quickly met under more working conditions on the premise of not increasing the oil consumption of the engine or slightly increasing the oil consumption of the engine; thirdly, various engine components can be coordinated, and the exhaust temperature of the engine can be managed more efficiently on the basis of meeting relevant constraint conditions; fourthly, parts such as an air inlet throttle valve, an exhaust gas recirculation valve and the like arranged on some engines can be eliminated, and the cost of the engine assembly is reduced; fifth, the engine is suitable for most engines, including diesel engines, gasoline engines, natural gas engines, and the like.

The embodiment of the invention also provides an engine exhaust temperature management device. Referring to fig. 3, the apparatus includes:

the ignition frequency management module 001 is configured to obtain work information of a current engine, determine the ignition frequency of the engine according to the work information, and determine whether the engine needs to perform exhaust temperature coordination control on a coordination control unit based on the ignition frequency and the work information to obtain an exhaust temperature coordination control request flag 220, where the work information of the engine includes a required torque 110, an engine rotation speed 120, a target exhaust temperature 130, an actual exhaust temperature 140, and an exhaust temperature coordination control request flag 150.

A coordination component control configuration module 002, configured to determine coordination control information of the coordination control component according to the exhaust temperature coordination control request flag 220 and the working information, where the coordination control information of the coordination control component includes: a coordination component activation status word 310, an activation component control mode status word 320, and a closed loop control sequence status word 330.

And a coordination component closed-loop control module 003 for determining the closed-loop control command 410 based on the coordination control information and the operational information.

And a coordination component execution module 004 for driving corresponding coordination control component actions based on the closed-loop control command 410, the working information and the coordination control information.

Optionally, the firing frequency management module 001 includes:

a first determination submodule, configured to query the first lookup table 602 to determine the firing frequency 210 based on the required torque 110 and the engine speed 120 if the exhaust temperature management request flag is 0;

a second determination submodule for querying the second lookup table 603 to determine an open-loop control value of the ignition frequency based on the required torque 110, the engine speed 120 and the target exhaust temperature 130, determining a closed-loop control value of the ignition frequency 210 based on the open-loop control value, the target exhaust temperature 130 and the actual exhaust temperature 140, and determining the ignition frequency 210 based on the closed-loop control value, if the exhaust temperature management request flag is 1.

Specifically, as shown in FIG. 3, determining a closed-loop control value for the firing frequency 210 based on the open-loop control value, the target exhaust temperature 130, and the actual exhaust temperature 140, and determining the firing frequency 210 based on the closed-loop control value includes: the target exhaust temperature 130 and the actual exhaust temperature 140 are closed-loop controlled and then added with an open-loop control value to obtain a closed-loop control value of the firing frequency 210; the closed loop control value of the firing frequency 210 is adjusted by the firing frequency limit module 702 to obtain the firing frequency 210.

Optionally, the harmonization component closed-loop control module 003 comprises:

a third determination sub-module for determining an upper limit value of the controller output based on the coordinating component activation status word 310 and the activation component control mode status word 310;

a fourth determination submodule operable to determine the closed-loop-control command 410 based on the target exhaust temperature 130, the actual exhaust temperature 140, and the upper limit value output by the controller.

Specifically, determining the upper limit value of the controller output based on the coordinating component activation status word 310 and the activation component control mode status word 320 includes: performing bitwise and operation on the coordination unit activation state word 310 and the activation unit control mode state word 320, and converting the calculation result into a binary value; and counting the number of '1' contained in the secondary system value, wherein the number of '1' is the upper limit value output by the controller.

Optionally, the coordination component execution module 004 is specifically configured to: determining a coordination control component adopting a closed-loop control mode and a coordination control component adopting an open-loop control mode according to the coordination component activation state word 310 and the activation component control mode state word 320; determining an execution order of the cooperative control element in a closed-loop control manner according to the closed-loop control order status word 330; sequentially performing drive control on the coordination control components adopting the closed-loop control mode according to the closed-loop control instruction 410; and inquiring a third lookup table according to the working information to determine a driving instruction of the coordination control component adopting the open-loop control mode, and performing driving control on the coordination control component adopting the open-loop control mode.

The device provided by the embodiment of the present invention has the same implementation principle and technical effect as the method embodiments, and for the sake of brief description, reference may be made to the corresponding contents in the method embodiments without reference to the device embodiments.

The engine exhaust temperature management method provided by the embodiment of the invention has the same technical characteristics as the engine exhaust temperature management device provided by the embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.

The embodiment of the invention also provides an engine, and the engine adopts the engine exhaust temperature management method in any embodiment.

The engine provided by the embodiment of the present invention employs the engine exhaust temperature management method provided by the above embodiment, so that the engine provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, and details are not repeated herein.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention and the technical principles applied thereto. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in some detail by the above embodiments, the invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the invention, and the scope of the invention is determined by the scope of the appended claims.

Claims (10)

1. An engine exhaust temperature management method, characterized in that the method comprises:

acquiring working information of a current engine, determining ignition frequency of the engine according to the working information, and determining whether the engine needs to carry out temperature-discharging coordination control on a coordination control component based on the ignition frequency and the working information to obtain a temperature-discharging coordination control request flag bit, wherein the working information of the engine comprises required torque, engine rotating speed, target exhaust temperature, actual exhaust temperature and a temperature-discharging management request flag bit;

judging whether the sparking frequency can be used for sparking based on the frequency to reach the required exhaust temperature or not according to the sparking frequency;

if the temperature is reached, the value of the temperature exhaust management request flag bit is 0;

if the sparking frequency is based on the ignition frequency and the required exhaust temperature cannot be reached, the value of the exhaust temperature management request flag bit is 1;

determining coordination control information of the coordination control component according to the temperature-discharging coordination control request flag bit and the working information, wherein the coordination control information of the coordination control component comprises: a coordination component activation status word, an activation component control mode status word, and a closed-loop control sequence status word;

determining a closed-loop control instruction based on the coordinated control information and the working information;

and driving the corresponding coordination control component to act based on the closed-loop control instruction, the working information and the coordination control information.

2. The method of claim 1, wherein said determining an ignition frequency of said engine based on said operating information comprises:

if the exhaust temperature management request flag bit is 0, inquiring a first lookup table based on the required torque and the engine rotating speed to determine the ignition frequency;

if the exhaust temperature management request flag bit is 1, inquiring a second lookup table based on the required torque, the engine speed and the target exhaust temperature to determine an open-loop control value of the ignition frequency, determining a closed-loop control value of the ignition frequency based on the open-loop control value, the target exhaust temperature and the actual exhaust temperature, and determining the ignition frequency based on the closed-loop control value.

3. The method of claim 2, wherein the determining a closed-loop control value for the firing frequency based on the open-loop control value, the target exhaust temperature, and the actual exhaust temperature, and the determining the firing frequency based on the closed-loop control value comprises:

the target exhaust temperature and the actual exhaust temperature are subjected to closed-loop control, and then the closed-loop control value of the ignition frequency is obtained by adding the open-loop control value;

and adjusting the closed-loop control value of the ignition frequency through an ignition frequency limiting module to obtain the ignition frequency.

4. The method of claim 1, wherein the determining closed-loop control commands based on the coordinated control information and the operational information comprises:

determining an upper limit value of a controller output based on the coordination component activation status word and the activation component control mode status word;

determining the closed-loop control command based on the target exhaust temperature, the actual exhaust temperature, and an upper limit value output by the controller.

5. The method of claim 4, wherein determining an upper limit value for a controller output based on the coordinating component activation status word and the activation component control mode status word comprises:

performing bitwise AND operation on the coordination component activation state words and the activation component control mode state words, and converting a calculation result into a binary value;

and counting the number value of '1' contained in the secondary system value, wherein the number value of '1' is the upper limit value output by the controller.

6. The method of claim 1, wherein the driving the respective coordinated control component action based on the closed-loop control command, the operational information, and the coordinated control information comprises:

determining a coordination control component adopting a closed-loop control mode and a coordination control component adopting an open-loop control mode according to the coordination component activation state word and the activation component control mode state word;

determining the execution sequence of the coordination control component adopting a closed-loop control mode according to the closed-loop control sequence state word;

sequentially carrying out drive control on the coordination control components adopting a closed-loop control mode according to the closed-loop control instructions;

and inquiring a third lookup table according to the working information to determine a driving instruction of the coordination control component adopting an open-loop control mode, and performing driving control on the coordination control component adopting the open-loop control mode.

7. An engine exhaust temperature management apparatus, the apparatus comprising:

the ignition frequency management module is used for acquiring the working information of the current engine, determining the ignition frequency of the engine according to the working information, and determining whether the engine needs to carry out temperature-discharge coordination control on a coordination control component or not based on the ignition frequency and the working information to obtain a temperature-discharge coordination control request flag bit, wherein the working information of the engine comprises a required torque, an engine rotating speed, a target exhaust temperature, an actual exhaust temperature and a temperature-discharge coordination control request flag bit;

judging whether the sparking frequency can be used for sparking based on the frequency to reach the required exhaust temperature or not according to the sparking frequency;

if the flag bit can be reached, the value of the exhaust temperature management request flag bit is 0;

if the flashover based on the ignition frequency cannot reach the required exhaust temperature, the value of the exhaust temperature management request flag bit is 1;

a coordination component control configuration module, configured to determine coordination control information of the coordination control component according to the temperature removal coordination control request flag bit and the working information, where the coordination control information of the coordination control component includes: a coordination component activation status word, an activation component control mode status word, and a closed-loop control sequence status word;

a coordination component closed-loop control module for determining a closed-loop control instruction based on the coordination control information and the working information;

and the coordination component execution module is used for driving the corresponding coordination control component to act based on the closed-loop control instruction, the working information and the coordination control information.

8. The apparatus of claim 7, wherein the firing frequency management module comprises:

a first determination submodule configured to query a first lookup table based on the required torque and the engine speed to determine the ignition frequency if the exhaust temperature management request flag is 0;

and a second determination submodule, configured to, if the exhaust temperature management request flag is 1, query a second lookup table based on the required torque, the engine speed, and the target exhaust temperature to determine an open-loop control value of the ignition frequency, determine a closed-loop control value of the ignition frequency based on the open-loop control value, the target exhaust temperature, and the actual exhaust temperature, and determine the ignition frequency based on the closed-loop control value.

9. The apparatus of claim 7, wherein the coordinating component closed-loop control module comprises:

a third determination submodule, configured to determine an upper limit value output by the controller based on the coordination component activation status word and the activation component control manner status word;

a fourth determination submodule configured to determine the closed-loop control command based on the target exhaust temperature, the actual exhaust temperature, and an upper limit value output by the controller.

10. An engine characterized by using the engine exhaust temperature management method according to any one of claims 1 to 7.

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