CN-122014395-A - PID dynamic closed-loop control method and control system for electric main water pump of engine

CN122014395ACN 122014395 ACN122014395 ACN 122014395ACN-122014395-A

Abstract

The invention provides a PID dynamic closed-loop control method and a control system for an electric main water pump of an engine, which belong to the technical field of vehicles, accurately trigger the waste heat utilization of the engine by judging heating requests and the starting state of the engine, control based on water temperature economy/reliability/heating requirement by taking maximum value logic, determine a core control target, and form complete closed-loop control by PID closed-loop water temperature correction, water pump rotating speed lifting rate control and operation modules after stopping, thereby realizing the dynamic management of the full working condition and the priority of the electric main water pump of the engine, ensuring the water temperature control precision and response speed under different scenes, avoiding the limitation of single control logic by the cooperation of the modules, and finally achieving the comprehensive benefits of improving the economy, the reliability and the running comfort of the whole vehicle.

Inventors

WANG ANJI
WANG XUHONG
FU JING
WANG YUHAN
CHEN LIANG

Assignees

东风汽车集团股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260320

Claims (10)

1. A PID dynamic closed-loop control method of an electric main water pump of an engine is characterized in that, Judging whether a heating request exists or not; When a heating request exists and the engine is started, respectively calculating the rotation speed of the main water pump based on water temperature economy, reliability and heating requirement, controlling the main water pump to work in a mode of maximum value of the rotation speeds of the water pumps in the three modes, and correcting the water temperature through PID closed-loop control; when the heating request does not exist and the engine is started, the main water pump rotating speed based on water temperature economy and reliability is calculated respectively, the main water pump is controlled to work in a mode of maximum water pump rotating speed in the main water pump and the main water pump, and the water temperature is corrected through PID closed-loop control.
2. The control method according to claim 1, wherein the main water pump operation mode based on water temperature economy includes: after the engine is started, controlling the main water pump to run at a set rotating speed for a certain period of time; When the ECU detects that the water temperature is smaller than T1, the main water pump operates at the minimum rotation speed; when the ECU detects that the water temperature is in the temperature range of T1 and T2, determining the rotating speed of the main water pump through a pre-stored first mapping relation table lookup according to the load and the rotating speed of the engine; when the ECU detects that the water temperature is greater than T3, the main water pump operates at the maximum rotation speed, and when the water temperature is reduced to be lower than T2, the main water pump exits from the maximum rotation speed operation state.
3. The control method according to claim 1, wherein the reliability-based water pump operation mode includes: when the EGR system is started, according to the EGR flow demand under each working condition, acquiring the corresponding main water pump rotating speed through a pre-stored second mapping relation table; And determining the rotating speed of the main water pump through a pre-stored third mapping relation table according to the water temperature and the engine load.
4. The control method according to claim 1, wherein the main water pump operation mode based on heating demand includes: According to the flow requirement of the warm air, and obtaining the rotating speed of the main water pump through a pre-stored fourth mapping relation table.
5. The control method according to claim 1, wherein the PID closed-loop control correction water temperature includes: P items are calculated according to the temperature difference between the actual water temperature of the engine and the target water temperature, and P parameters are obtained through table lookup and calibration of the water temperature of the engine; I is calculated according to the temperature difference between the actual water temperature of the engine and the target water temperature, and I parameters are calibrated by looking up a table of the water temperature of the engine; d, calculating according to the actual water temperature change rate of the engine, and calibrating parameters of the D through the table lookup of the water temperature of the engine; calculating the increment and decrement of the sum of the P item, the I item and the D item so as to obtain the increment requirement of the main water pump; And obtaining the actual rotation speed increment of the main water pump according to the increment requirement of the main water pump.
6. The control method according to claim 1, wherein when a heating request is made and the engine is not started, the main water pump rotation speed is controlled in accordance with a temperature difference between the air conditioner set temperature and the in-vehicle temperature.
7. The control method according to claim 1, wherein after the stop, if the engine water temperature is higher than a first set temperature, the rotational speed is kept to be turned off for a first time when the power is turned off; if the temperature of the engine water is smaller than the first set temperature, keeping the set duty cycle and delaying the second time to be closed.
8. The method of claim 1, wherein the speed of the main pump is controlled based on NVH requirements and cooling requirements during operation.
9. A PID dynamic closed loop control system of an electric main water pump of an engine, configured to implement a control method according to any one of claims 1-8, comprising: The judging module is used for judging whether a heating request exists or not and whether the engine is started or not; the system comprises a calculation module, a main water pump rotation speed calculation module and a control module, wherein the calculation module is used for respectively calculating the main water pump rotation speed based on water temperature economy, reliability and heating requirements when a heating request exists and an engine is started; And the control module is used for controlling the main water pump to work in a mode corresponding to the maximum water pump rotating speed according to the calculation result.
10. An electronic device, comprising: one or more processors; A memory for storing one or more programs; When executed by the one or more processors, causes the one or more processors to implement the steps of the method of any of claims 1-8.

Description

PID dynamic closed-loop control method and control system for electric main water pump of engine Technical Field The invention relates to the technical field of vehicles, in particular to a PID dynamic closed-loop control method and a control system of an electric main water pump of an engine. Background In the prior art, the control method of the engine water pump is various. One of the schemes (application number: 202010559724.5) is to calculate the engine water pump speed through the water temperature and the engine load for open-loop control. This open loop control approach, while relatively simple in construction, suffers from significant drawbacks. In the actual running process, the open loop control cannot be dynamically adjusted according to the real-time water temperature change. For example, when the external environment temperature suddenly changes and the engine load suddenly fluctuates, the rotation speed of the water pump set by the open loop control cannot respond to the changes in time, which may cause the water temperature of the engine to be too high or too low. Too high water temperature can affect the service life of the engine and even cause faults, and too low water temperature can increase fuel consumption and reduce the working efficiency of the engine. In addition, the open loop control is difficult to meet various requirements of economy, reliability, heating and the like of the engine, and the adaptability under complex working conditions is poor. Disclosure of Invention The invention aims to solve at least one technical problem in the prior art, and provides a PID dynamic closed-loop control method and a control system of an electric main water pump of an engine. In a first aspect, the embodiment of the invention provides a PID dynamic closed-loop control method of an electric main water pump of an engine, Judging whether a heating request exists or not; When a heating request exists and the engine is started, respectively calculating the rotation speed of the main water pump based on water temperature economy, reliability and heating requirement, controlling the main water pump to work in a mode of maximum value of the rotation speeds of the water pumps in the three modes, and correcting the water temperature through PID closed-loop control; when the heating request does not exist and the engine is started, the main water pump rotating speed based on water temperature economy and reliability is calculated respectively, the main water pump is controlled to work in a mode of maximum water pump rotating speed in the main water pump and the main water pump, and the water temperature is corrected through PID closed-loop control. Optionally, the main water pump working mode based on water temperature economy comprises: after the engine is started, controlling the main water pump to run at a set rotating speed for a certain period of time; When the ECU detects that the water temperature is smaller than T1, the main water pump operates at the minimum rotation speed; when the ECU detects that the water temperature is in the temperature range of T1 and T2, determining the rotating speed of the main water pump through a pre-stored first mapping relation table lookup according to the load and the rotating speed of the engine; when the ECU detects that the water temperature is greater than T3, the main water pump operates at the maximum rotation speed, and when the water temperature is reduced to be lower than T2, the main water pump exits from the maximum rotation speed operation state. Optionally, the reliability-based water pump working mode includes: when the EGR system is started, according to the EGR flow demand under each working condition, acquiring the corresponding main water pump rotating speed through a pre-stored second mapping relation table; And determining the rotating speed of the main water pump through a pre-stored third mapping relation table according to the water temperature and the engine load. Optionally, the main water pump working mode based on heating requirement includes: According to the flow requirement of the warm air, and obtaining the rotating speed of the main water pump through a pre-stored fourth mapping relation table. Optionally, the PID closed loop control corrected water temperature includes: P items are calculated according to the temperature difference between the actual water temperature of the engine and the target water temperature, and P parameters are obtained through table lookup and calibration of the water temperature of the engine; I is calculated according to the temperature difference between the actual water temperature of the engine and the target water temperature, and I parameters are calibrated by looking up a table of the water temperature of the engine; d, calculating according to the actual water temperature change rate of the engine, and calibrating parameters of the D through the table lookup of the water temperature of the engin