CN-117267013-B - Rail pressure control method and device, vehicle, equipment and storage medium

CN117267013BCN 117267013 BCN117267013 BCN 117267013BCN-117267013-B

Abstract

The invention relates to a rail pressure control method, a device, a vehicle, equipment and a storage medium, which comprise the following steps of calculating a predicted rail pressure based on a rail pressure value demand and the actual working capacity of a fuel system actuator; the method comprises the steps of calculating open-loop flow of a fuel system actuator based on fuel injection quantity demand and predicted rail pressure, calculating corrected flow of the fuel system actuator based on the predicted rail pressure and actual rail pressure measured by a rail pressure sensor, and controlling total flow of the fuel system actuator based on the open-loop flow of the fuel system actuator and the corrected flow of the fuel system actuator. Because the open-loop flow and the corrected flow of the fuel system actuator are calculated based on the predicted rail pressure, the actual oil supply capacity of the actuator is considered when the open-loop flow and the corrected flow are calculated, and are not calculated and accumulated according to the pure ideal condition of the rail pressure set value, the redundant accumulation is not carried out in the stage of limited capacity of the fuel system actuator.

Inventors

ZOU YUXIAO
JIANG LIGAO
ZHANG XIAOGUANG
HU SHUNYU
Wu Zichong
ZHANG HENGPING
CHEN YUJUN
ZHOU JIEMIN
ZHANG YAXIAO
YU JUNPENG

Assignees

东风商用车有限公司

Dates

Publication Date: 20260512
Application Date: 20230904

Claims (8)

1. The rail pressure control method based on the predicted rail pressure is characterized by comprising the following steps of: Calculating a predicted rail pressure based on the rail pressure value demand and the actual operating capacity of the fuel system actuator; Calculating open loop flow of the fuel system actuator based on the fuel injection demand and the predicted rail pressure; calculating to obtain the corrected flow of the fuel system actuator based on the predicted rail pressure and the actual rail pressure measured by the rail pressure sensor; Controlling the total flow of the fuel system actuator based on the open loop flow of the fuel system actuator and the corrected flow of the fuel system actuator, wherein the fuel system actuator comprises a fuel metering valve and an electric control pressure regulating valve, and the electric control pressure regulating valve is used for draining oil from a high-pressure common rail to a low-pressure oil circuit; the calculating the open loop flow of the fuel system actuator based on the fuel injection demand and the predicted rail pressure comprises the following steps: obtaining feedforward flow according to the fuel injection quantity, the dynamic leakage quantity and the static leakage quantity; Calculating the regulating flow of the fuel system actuator according to the difference value between the rail pressure value demand and the predicted rail pressure; The open loop flow of the fuel system actuator is calculated based on the feed forward flow of the fuel system actuator and the regulated flow of the fuel system actuator.
2. The rail pressure control method based on the predicted rail pressure according to claim 1, wherein the obtaining the feed-forward flow from the injection amount, the dynamic leakage amount, and the static leakage amount includes: Obtaining oil injection quantity and dynamic leakage quantity based on oil injection quantity demand; calculating static leakage according to the predicted rail pressure; And obtaining the feedforward flow according to the fuel injection quantity, the dynamic leakage quantity and the static leakage quantity.
3. The rail pressure control method based on the predicted rail pressure according to claim 1, wherein the calculating the regulated flow rate of the fuel system actuator based on the difference between the rail pressure demand and the predicted rail pressure includes: Calculating a difference value between the rail pressure value demand and the predicted rail pressure; and according to the actual working capacities of the oil pump and the electric control pressure regulating valve, dividing the calculated difference value into a fuel metering valve regulating flow and an electric control pressure regulating valve regulating flow.
4. The rail pressure control method based on the predicted rail pressure according to claim 1, wherein the calculating the corrected flow rate of the fuel system actuator based on the predicted rail pressure and the actual rail pressure measured by the rail pressure sensor includes: And taking the difference value of the predicted rail pressure and the actual rail pressure measured by the rail pressure sensor as an object of closed-loop regulation of the PID control system to obtain the corrected flow of the fuel system actuator.
5. A rail pressure control device based on predicted rail pressure, comprising: A prediction module for calculating a predicted rail pressure based on the rail pressure value demand and the actual operating capacity of the fuel system actuators; An open loop flow calculation module for calculating an open loop flow of the fuel system actuator based on the fuel injection demand and the predicted rail pressure; The closed-loop control module is used for calculating and obtaining the corrected flow of the fuel system actuator based on the predicted rail pressure and the actual rail pressure measured by the rail pressure sensor; The controller is used for sending a driving signal to the fuel system actuator based on the open-loop flow of the fuel system actuator and the corrected flow of the fuel system actuator, wherein the fuel system actuator comprises a fuel metering valve and an electric control pressure regulating valve, and the electric control pressure regulating valve is used for draining oil from a high-pressure common rail to a low-pressure oil circuit; the calculating the open loop flow of the fuel system actuator based on the fuel injection demand and the predicted rail pressure comprises the following steps: obtaining feedforward flow according to the fuel injection quantity, the dynamic leakage quantity and the static leakage quantity; Calculating the regulating flow of the fuel system actuator according to the difference value between the rail pressure value demand and the predicted rail pressure; The open loop flow of the fuel system actuator is calculated based on the feed forward flow of the fuel system actuator and the regulated flow of the fuel system actuator.
6. A vehicle comprising a fuel system, the fuel system comprising: The fuel oil system comprises a fuel oil rail, wherein a rail pressure sensor is arranged at one end of the fuel oil rail, and the fuel oil rail is connected with a fuel oil system actuator; and a rail pressure control device as defined in claim 5, in signal communication with the fuel system actuator.
7. A rail pressure controlled computing device comprising a processor and a memory, wherein the memory has stored therein computer instructions, the processor executing the computer instructions to implement the method of any of claims 1-4.
8. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, computer instructions in the computer-readable storage medium, when executed by a computing device, cause the computing device to perform the method of any of claims 1-4.

Description

Rail pressure control method and device, vehicle, equipment and storage medium Technical Field The invention relates to the field of high-pressure common rail fuel systems of vehicles, in particular to a rail pressure control method, a rail pressure control device, a vehicle, equipment and a storage medium. Background The high-pressure common rail fuel system structure of the vehicle is generally as follows, one end of the fuel rail is a rail pressure sensor, the other end of the fuel rail is an electric control pressure regulating valve (oil is discharged from the fuel rail to a low-pressure oil circuit), a high-pressure oil pipe on the fuel rail is connected with an oil sprayer for oil injection, and oil is injected into the fuel rail through a fuel metering valve (the fuel metering valve comprises an inlet control type and an outlet control type, and is installed in a single pump or integrated with a pump nozzle). In the related art, referring to fig. 1, in the closed-loop control of the rail pressure, the current technical scheme is to determine the required rail pressure and the required oil amount according to the operation condition of the engine, and calculate and control the feedforward flow by the required oil amount, the static leakage and the dynamic leakage of the system. And calculating the deviation of rail pressure control by using the actual rail pressure actually adopted by the required rail pressure and the rail pressure sensor, and calculating PID (Proportional self-regulating) flow by taking the rail pressure deviation as an object regulated and controlled by a PID (Proportional INTEGRAL DERIVATIVE) control system. The feedforward flow is combined with the PID regulating flow, and the driving signal is determined to drive the actuator to work according to the characteristics of the actuator (the fuel metering valve and the electric control pressure regulating valve) of the fuel system. However, the rail pressure control scheme has the problem that the rail pressure deviation value as the adjustment object of the PID control system is calculated by directly subtracting the actual rail pressure from the rail pressure set value, the calculation mode is used for calculating and accumulating PID adjustment according to the purely ideal condition no matter the actual oil supply capacity of the fuel system, the PID adjustment is not increased, and particularly the integral term is accumulated continuously at the stage, so that the response of the rail pressure is not facilitated. Therefore, there is a need to devise a new rail pressure control method, apparatus, vehicle, device and storage medium to overcome the above-mentioned problems. Disclosure of Invention The embodiment of the invention provides a rail pressure control method, a rail pressure control device, a vehicle, rail pressure control equipment and a storage medium, which are used for solving the problems that PID adjustment calculation and accumulation are carried out according to the pure ideal condition in the related technology, and the response of rail pressure is not facilitated. In a first aspect, a rail pressure control method based on predicted rail pressure is provided, comprising the steps of: Calculating a predicted rail pressure based on the rail pressure value demand and the actual operating capacity of the fuel system actuator; Calculating open loop flow of the fuel system actuator based on the fuel injection demand and the predicted rail pressure; calculating to obtain the corrected flow of the fuel system actuator based on the predicted rail pressure and the actual rail pressure measured by the rail pressure sensor; the total flow of the fuel system actuator is controlled based on the open loop flow of the fuel system actuator and the corrected flow of the fuel system actuator. In some embodiments, the calculating the open loop flow of the fuel system actuator based on the fuel injection demand and the predicted rail pressure includes: calculating a feed-forward flow of the fuel system actuator based on the fuel injection demand and the predicted rail pressure; Calculating the regulating flow of the fuel system actuator according to the difference value between the rail pressure value demand and the predicted rail pressure; The open loop flow of the fuel system actuator is calculated based on the feed forward flow of the fuel system actuator and the regulated flow of the fuel system actuator. In some embodiments, the calculating the feed-forward flow of the fuel system actuator based on the fuel injection demand and the predicted rail pressure includes: Obtaining oil injection quantity and dynamic leakage quantity based on oil injection quantity demand; calculating static leakage according to the predicted rail pressure; And obtaining the feedforward flow according to the fuel injection quantity, the dynamic leakage quantity and the static leakage quantity. In some embodiments, the fuel system actuator comprises a