CN-122014448-A - Engine oil supply system control method and device and engine oil supply system

CN122014448ACN 122014448 ACN122014448 ACN 122014448ACN-122014448-A

Abstract

The invention discloses a control method and a device of an engine oil supply system and the engine oil supply system, wherein the method acquires first fuel pressure between a low-pressure oil way and a high-pressure oil way through a low-pressure sensor and determines the actual oil supply quantity input into the high-pressure oil way; the method comprises the steps of obtaining oil output of a high-pressure oil rail in a high-pressure oil way, inputting actual oil supply quantity and oil output quantity into a preset rail pressure calculation model to determine second fuel pressure of the high-pressure oil rail, and adjusting the actual oil supply quantity input into the high-pressure oil way according to the second fuel pressure. In the process of adjusting the oil supply quantity, the actual oil supply quantity input to the high-pressure oil way is determined by detecting the first fuel pressure between the low-pressure oil way and the high-pressure oil way, and then the second fuel pressure of the high-pressure oil way is determined according to the actual oil supply quantity and the oil output quantity of the high-pressure oil way, so that the second fuel pressure in the high-pressure oil way is obtained under the condition that a rail pressure sensor is not required to be arranged, and the cost of adjusting the oil supply quantity is effectively reduced.

Inventors

LI SHUANGYAN
MA SHUAIYING
GOU BO
LI MI

Assignees

浙江吉利控股集团有限公司
浙江远程新能源商用车集团有限公司
浙江远程商用车研发有限公司

Dates

Publication Date: 20260512
Application Date: 20260316

Claims (10)

1. The control method of the engine oil supply system is characterized in that the engine oil supply system comprises a low-pressure oil circuit, a high-pressure oil circuit and a low-pressure sensor arranged between the high-pressure oil circuit and the low-pressure oil circuit; the method comprises the following steps: Acquiring a first fuel pressure between the low-pressure oil way and the high-pressure oil way through the low-pressure sensor; determining the actual oil supply quantity input to a high-pressure oil circuit according to the first fuel pressure; acquiring the oil output of a high-pressure oil rail in the high-pressure oil way; Inputting the actual oil supply amount and the oil output amount into a preset rail pressure calculation model to determine the second fuel pressure of the high-pressure oil rail, wherein the preset rail pressure calculation model is constructed based on the mass balance principle in the high-pressure oil rail; And adjusting the actual oil supply quantity input to the high-pressure oil circuit according to the second fuel pressure.
2. The engine oil supply system control method according to claim 1, wherein said determining an actual amount of oil supplied to the high-pressure oil passage based on said first fuel pressure includes: acquiring the oil pump rotation speed of a high-pressure oil pump in the high-pressure oil circuit; acquiring theoretical oil supply quantity input to a high-pressure oil circuit; Determining a correction coefficient of the theoretical oil supply amount through the first fuel pressure and the oil pump rotating speed; and correcting the theoretical oil supply amount according to the correction coefficient to obtain the actual oil supply amount.
3. The engine oil supply system control method according to claim 2, wherein the obtaining the theoretical oil supply amount input to the high-pressure oil passage includes: acquiring a signal duty ratio of a control signal of the fuel metering valve; and determining the theoretical oil supply amount input to the high-pressure oil circuit according to the oil pump rotating speed, the signal duty ratio and a first mapping relation, wherein the first mapping relation is a corresponding relation among the oil pump rotating speed, the signal duty ratio of a control signal and the theoretical oil supply amount.
4. The engine oil supply system control method according to claim 1, wherein said adjusting the actual amount of oil supplied to the high-pressure oil passage according to the second fuel pressure includes: acquiring target fuel pressure of the high-pressure fuel rail; Adjusting a signal duty cycle of a control signal of a fuel metering valve according to the target fuel pressure and the second fuel pressure; And adjusting the actual oil supply quantity input to the high-pressure oil circuit according to the adjusted control signal.
5. The engine oil supply system control method according to claim 4, wherein the obtaining the target fuel pressure of the high-pressure fuel rail includes: Acquiring the rotating speed and the load of an engine; And determining the target fuel pressure of the high-pressure oil rail according to the engine speed, the engine load and a second mapping relation, wherein the second mapping relation is a corresponding relation between the engine speed, the engine load and the target fuel pressure of the high-pressure oil rail.
6. The engine fueling system control method of claim 5 wherein said determining a target fuel pressure for said high pressure fuel rail based on said engine speed, said engine load, and a second map further comprises: acquiring the current temperature of the high-pressure oil rail; correcting the second mapping relation according to the current temperature to obtain a corrected second mapping relation; and determining the target fuel pressure of the high-pressure fuel rail based on the engine speed, the engine load and the corrected second mapping relation.
7. The engine oil supply system control method according to any one of claims 1 to 6, characterized by further comprising, after the first fuel pressure between the low-pressure oil passage and the high-pressure oil passage is obtained by the low-pressure sensor: And outputting a first fault signal under the condition that the first fuel pressure is smaller than a preset pressure threshold value, wherein the first fault signal is used for representing that the low-pressure oil circuit is in a fault state.
8. The engine oil supply system control method according to claim 7, characterized in that the obtaining, by the low pressure sensor, the first fuel pressure between the low pressure oil passage and the high pressure oil passage, further comprises: Continuously acquiring the second fuel pressure and recording the adjusting time of the second fuel pressure under the condition that the first fuel pressure is not smaller than a preset pressure threshold; and under the condition that the adjustment time length reaches the preset time length, if the second fuel pressure is not adjusted to the target fuel pressure, outputting a second fault signal, wherein the second fault signal is used for representing that the high-pressure oil line is in a fault state.
9. The engine oil supply system control device is characterized by comprising a low-pressure oil circuit, a high-pressure oil circuit and a low-pressure sensor arranged between the high-pressure oil circuit and the low-pressure oil circuit; the device comprises: the pressure acquisition module is used for acquiring first fuel pressure between the low-pressure oil way and the high-pressure oil way through the low-pressure sensor; The fuel supply quantity determining module is used for determining the actual fuel supply quantity input to the high-pressure oil circuit according to the first fuel pressure; The oil outlet quantity acquisition module is used for acquiring the oil outlet quantity of the high-pressure oil rail in the high-pressure oil way; The pressure determining module is used for inputting the actual oil supply amount and the oil output amount into a preset rail pressure calculating model to determine the second fuel pressure of the high-pressure oil rail, wherein the preset rail pressure calculating model is constructed based on the mass balance principle in the high-pressure oil rail; And the fuel supply control module is used for adjusting the actual fuel supply quantity input to the high-pressure oil circuit according to the second fuel pressure.
10. An engine oil supply system, comprising: the low-pressure oil way comprises a low-pressure oil pump and a fuel filter which are connected through an oil pipe; The high-pressure oil way comprises a high-pressure oil pump, a high-pressure oil rail and an oil sprayer which are connected through an oil pipe; The fuel metering valve is arranged on an oil pipe between the fuel filter and the high-pressure oil pump; the low-pressure sensor is arranged on an oil pipe between the fuel filter and the fuel metering valve; an electronic control unit connected to the low pressure sensor and the fuel metering valve in the high pressure oil path, the electronic control unit being configured to execute the engine oil supply system control method according to any one of claims 1 to 8.

Description

Engine oil supply system control method and device and engine oil supply system Technical Field The invention relates to the technical field of vehicles, in particular to an engine oil supply system control method and device and an engine oil supply system. Background The modern automobile engine generally adopts a direct injection technology in a high-pressure cylinder, and compared with the traditional natural air suction, the direct injection technology in the high-pressure cylinder is used for directly injecting fuel into the cylinder, so that more accurate fuel control and higher combustion efficiency are realized, and the power output and fuel economy of the engine are obviously improved. The in-cylinder direct injection engine oil supply system generally comprises a low-pressure oil way and a high-pressure oil way, wherein a rail pressure sensor is arranged on a high-pressure oil rail in the high-pressure oil way, and the fuel pressure in the high-pressure oil rail can be accurately detected through the rail pressure sensor, so that the oil supply amount between the high-pressure oil way and the low-pressure oil way is adjusted based on the fuel pressure in the high-pressure oil rail. However, rail pressure sensors have a high cost as a precise pressure detection device, which results in excessive costs for the oil supply quantity adjustment process. Disclosure of Invention The invention mainly aims to provide a control method and device for an engine oil supply system and the engine oil supply system, and aims to solve the problem that the cost for detecting the internal combustion oil pressure of a high-pressure oil rail by using a rail pressure sensor is high in the prior art. In order to achieve the above object, the present invention provides a control method of an engine oil supply system, the engine oil supply system comprising a low pressure oil path, a high pressure oil path and a low pressure sensor arranged between the high pressure oil path and the low pressure oil path; the method comprises the following steps: Acquiring a first fuel pressure between the low-pressure oil way and the high-pressure oil way through the low-pressure sensor; determining the actual oil supply quantity input to a high-pressure oil circuit according to the first fuel pressure; acquiring the oil output of a high-pressure oil rail in the high-pressure oil way; Inputting the actual oil supply amount and the oil output amount into a preset rail pressure calculation model to determine the second fuel pressure of the high-pressure oil rail, wherein the preset rail pressure calculation model is constructed based on the mass balance principle in the high-pressure oil rail; And adjusting the actual oil supply quantity input to the high-pressure oil circuit according to the second fuel pressure. Optionally, the determining the actual fuel supply amount input to the high-pressure fuel line according to the first fuel pressure includes: acquiring the oil pump rotation speed of a high-pressure oil pump in the high-pressure oil circuit; acquiring theoretical oil supply quantity input to a high-pressure oil circuit; Determining a correction coefficient of the theoretical oil supply amount through the first fuel pressure and the oil pump rotating speed; and correcting the theoretical oil supply amount according to the correction coefficient to obtain the actual oil supply amount. Optionally, the obtaining the theoretical oil supply amount input to the high-pressure oil path includes: acquiring a signal duty ratio of a control signal of the fuel metering valve; and determining the theoretical oil supply amount input to the high-pressure oil circuit according to the oil pump rotating speed, the signal duty ratio and a first mapping relation, wherein the first mapping relation is a corresponding relation among the oil pump rotating speed, the signal duty ratio of a control signal and the theoretical oil supply amount. Optionally, the adjusting the actual fuel supply amount input to the high-pressure fuel line according to the second fuel pressure includes: acquiring target fuel pressure of the high-pressure fuel rail; Adjusting a signal duty cycle of a control signal of a fuel metering valve according to the target fuel pressure and the second fuel pressure; And adjusting the actual oil supply quantity input to the high-pressure oil circuit according to the adjusted control signal. Optionally, the acquiring the target fuel pressure of the high-pressure fuel rail includes: Acquiring the rotating speed and the load of an engine; And determining the target fuel pressure of the high-pressure oil rail according to the engine speed, the engine load and a second mapping relation, wherein the second mapping relation is a corresponding relation between the engine speed, the engine load and the target fuel pressure of the high-pressure oil rail. Optionally, the determining the target fuel pressure of the high-pressure fuel rail according to