CN-121976898-A - EGR system control method, vehicle, electronic device and storage medium

CN121976898ACN 121976898 ACN121976898 ACN 121976898ACN-121976898-A

Abstract

The application relates to the field of control of an engine air intake and exhaust system, in particular to an EGR system control method, a vehicle, electronic equipment and a storage medium. The EGR system comprises an EGR exhaust gas temperature regulating unit and an EGR valve, wherein the EGR exhaust gas temperature regulating unit is connected with the EGR valve through a pipeline, the control method of the EGR system comprises the steps of obtaining a condensation temperature threshold value of temperature regulating exhaust gas which is exhaust gas discharged from an engine and regulated by the EGR exhaust gas temperature regulating unit, determining the condensation risk degree of the temperature regulating exhaust gas based on the condensation temperature threshold value and the temperature of the temperature regulating exhaust gas, regulating the cooling degree of the exhaust gas discharged from the engine through the EGR exhaust gas temperature regulating unit if the condensation risk degree belongs to a first condensation risk level, and controlling the opening degree of the EGR valve to be reduced if the condensation risk degree belongs to a second condensation risk level, wherein the second condensation risk level is higher than the first condensation risk level. The application can accurately prevent the generation of condensed water and ensure high EGR rate as much as possible.

Inventors

SUN JIALI
YANG ZENGQIANG
LIN GUICHENG
ZHANG SAI
CHAI XIN
XU HAIYUN
XIA YUMING
LI XIAOJUAN
LI MINGYU

Assignees

极光湾(台州)发动机有限公司
极光湾(宁波)智能科技有限公司
极光湾科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260323

Claims (10)

1. An EGR system control method is characterized in that the EGR system comprises an EGR exhaust gas temperature regulating unit and an EGR valve, wherein the EGR exhaust gas temperature regulating unit is connected with the EGR valve through a pipeline, and the EGR system control method comprises the following steps: acquiring a condensation temperature threshold of temperature-regulated exhaust gas, wherein the temperature-regulated exhaust gas is engine exhaust gas regulated by the EGR exhaust gas temperature regulating unit; determining a condensation risk level of the temperature-regulated exhaust gas based on the condensation temperature threshold and the temperature of the temperature-regulated exhaust gas; If the condensation risk degree belongs to a first condensation risk level, the cooling degree of the exhaust gas discharged by the engine is regulated down by the EGR exhaust gas temperature regulating unit; And if the condensation risk degree belongs to a second condensation risk level, controlling the opening degree of the EGR valve to be reduced, wherein the second condensation risk level is higher than the first condensation risk level.
2. The EGR system control method of claim 1, wherein the EGR exhaust gas attemperation unit includes an EGR cooler bypass valve and an EGR cooler; an inlet of the EGR cooler bypass valve is connected to an engine exhaust passage, an outlet of the EGR cooler bypass valve is provided with a cooling branch and a bypass branch, the cooling branch is provided with the EGR cooler, and the bypass branch merges with the cooling branch downstream of the outlet of the EGR cooler and is connected to the inlet of the EGR valve; The cooling degree of the engine exhaust gas is reduced by the EGR exhaust gas temperature adjustment unit, including: and/or the exhaust gas ratio of the bypass branch is increased by the bypass valve of the EGR cooler.
3. The EGR system control method of claim 2, wherein the first condensation risk level includes a first condensation risk sub-level and a second condensation risk sub-level, the first condensation risk sub-level being lower than the second condensation risk sub-level; The reducing the flow of cooling fluid in the EGR cooler and/or the increasing the exhaust gas ratio to the bypass branch through the EGR cooler bypass valve comprises: If the condensation risk degree belongs to a first condensation risk sub-level, executing the step of reducing the flow rate of the cooling liquid in the EGR cooler; And if the condensation risk degree belongs to a second condensation risk sub-grade, executing the step of increasing the exhaust gas ratio of the bypass branch through the bypass valve of the EGR cooler.
4. The EGR system control method of claim 1, wherein said obtaining a condensation temperature threshold of the temperature regulated exhaust gas includes: predicting the dew point temperature of the temperature-regulated exhaust gas to obtain a predicted dew point temperature; And obtaining a condensation temperature threshold of the temperature-regulated exhaust gas based on a preset safety margin temperature and the predicted dew point temperature, wherein the condensation temperature threshold is larger than the predicted dew point temperature.
5. The EGR system control method of claim 4, wherein said predicting the dew point temperature of said temperature-regulated exhaust gas to obtain a predicted dew point temperature includes: determining the humidity and pressure of the temperature-regulated exhaust gas; and inputting the temperature, the humidity and the pressure of the temperature-regulated waste gas into a preset dynamic dew point prediction model to obtain the predicted dew point temperature of the temperature-regulated waste gas.
6. The EGR system control method according to any one of claims 1 to 5, characterized in that the determining the condensation risk degree of the temperature-regulated exhaust gas based on the condensation temperature threshold and the temperature of the temperature-regulated exhaust gas includes: calculating a difference between the condensation temperature threshold and the temperature of the temperature-regulated exhaust gas; determining the condensation risk level based on the difference.
7. The EGR system control method according to any one of claims 1to 5, characterized in that the EGR system control method further includes: Monitoring the running state of each device in the EGR system; if equipment with abnormal operation exists in the EGR system, determining a fault-tolerant mode matched with the equipment with abnormal operation; and carrying out fault-tolerant control based on the matched fault-tolerant mode.
8. A vehicle is characterized by comprising an EGR system control device and an EGR system, wherein the EGR system comprises an EGR exhaust gas temperature regulating unit and an EGR valve, and the EGR exhaust gas temperature regulating unit is connected with the EGR valve through a pipeline; the threshold value acquisition module is used for acquiring a condensation temperature threshold value of temperature-regulated exhaust gas, wherein the temperature-regulated exhaust gas is engine exhaust gas regulated by the EGR exhaust gas temperature regulation unit; a risk determination module for determining a condensation risk degree of the temperature-regulated exhaust gas based on the condensation temperature threshold and the temperature of the temperature-regulated exhaust gas; The exhaust gas temperature adjusting module is used for adjusting the cooling degree of the exhaust gas discharged by the engine through the EGR exhaust gas temperature adjusting unit if the condensation risk degree belongs to a first condensation risk level; and the valve adjusting module is used for controlling the opening degree of the EGR valve to be reduced if the condensation risk degree belongs to a second condensation risk level, wherein the second condensation risk level is higher than the first condensation risk level.
9. An electronic device comprising a processor and a memory, wherein the memory is configured to store instructions, and wherein the processor is configured to invoke the instructions in the memory, so that the electronic device performs the EGR system control method according to any one of claims 1 to 7.
10. A computer-readable storage medium storing computer instructions that, when executed on an electronic device, cause the electronic device to perform the EGR system control method according to any one of claims 1 to 7.

Description

EGR system control method, vehicle, electronic device and storage medium Technical Field The application relates to the field of control of an engine air intake and exhaust system, in particular to an EGR system control method, a vehicle, electronic equipment and a storage medium. Background Exhaust gas recirculation (Exhaust Gas Recirculation, EGR) refers to returning a portion of the exhaust gas from the engine to the intake manifold and re-entering the cylinders with fresh mixture, and high EGR rates can improve emissions and fuel economy. However, when the temperature of the EGR exhaust gas is lower than the dew point after the EGR exhaust gas is cooled, condensed water can be separated out from the EGR exhaust gas, and the condensed water can affect combustion stability after entering a cylinder, even cause fire and engine shake, and the condensed water can also form an acidic corrosive solution with acidic gases (such as SOx and NOx) in the exhaust gas, so that corrosion of relevant parts of the EGR system is caused, and durability and reliability of the engine are seriously affected. Therefore, how to accurately prevent the generation of condensed water and to ensure a high EGR rate as much as possible is a problem to be solved. Disclosure of Invention In view of the above, embodiments of the present application provide an EGR system control method, a vehicle, an electronic device, and a storage medium, which can accurately prevent the generation of condensed water and ensure a high EGR rate as much as possible. In a first aspect, an embodiment of the present application provides a control method of an EGR system, where the EGR system includes an EGR exhaust gas temperature adjustment unit and an EGR valve, and the EGR exhaust gas temperature adjustment unit is connected to the EGR valve through a pipeline, and the control method of the EGR system includes: acquiring a condensation temperature threshold of temperature-regulated exhaust gas, wherein the temperature-regulated exhaust gas is engine exhaust gas regulated by the EGR exhaust gas temperature regulating unit; determining a condensation risk level of the temperature-regulated exhaust gas based on the condensation temperature threshold and the temperature of the temperature-regulated exhaust gas; If the condensation risk degree belongs to a first condensation risk level, the cooling degree of the exhaust gas discharged by the engine is regulated down by the EGR exhaust gas temperature regulating unit; And if the condensation risk degree belongs to a second condensation risk level, controlling the opening degree of the EGR valve to be reduced, wherein the second condensation risk level is higher than the first condensation risk level. By adopting the technical scheme, through obtaining the condensation temperature threshold value of the temperature-regulating waste gas and judging the condensation risk degree with the condensation threshold value, when the condensation risk degree is in the first condensation risk level relatively lower, the cooling degree of the waste gas discharged by the engine is regulated down through the EGR waste gas temperature regulating unit, the waste gas temperature can be improved on the premise of maintaining a higher EGR rate without reducing the opening degree of the EGR valve, the condition that condensed water is separated out is avoided from the temperature level, when the condensation risk is upgraded to the second higher condensation risk level, the flow of the recirculated waste gas is reduced by controlling the opening degree of the EGR valve, so that the EGR rate is reduced, the hidden danger of condensation under the high risk working condition can be eliminated, and under the different condensation risk scenes, the high EGR rate can be ensured as much as possible on the basis of accurate prevention of condensed water generation through the mode of the grading regulation. In some embodiments, the EGR exhaust gas attemperation unit includes an EGR cooler bypass valve and an EGR cooler; an inlet of the EGR cooler bypass valve is connected to an engine exhaust passage, an outlet of the EGR cooler bypass valve is provided with a cooling branch and a bypass branch, the cooling branch is provided with the EGR cooler, and the bypass branch merges with the cooling branch downstream of the outlet of the EGR cooler and is connected to the inlet of the EGR valve; The cooling degree of the engine exhaust gas is reduced by the EGR exhaust gas temperature adjustment unit, including: and/or the exhaust gas ratio of the bypass branch is increased by the bypass valve of the EGR cooler. By adopting the technical scheme, two control modes of reducing the flow of the cooling liquid and increasing the duty ratio of the bypass waste gas are provided, the flow of the cooling liquid is energy-saving, the adjustment efficiency of the mode of increasing the bypass waste gas is high, so that the intervention strategy of the first