Fuel pressure release valve failure judgment method

Abstract

The invention discloses a fuel pressure release valve failure judgment method, relates to the technical field of engine control, and solves the technical problem of engine failure caused by the fact that the failure of a pressure release valve cannot be detected by an existing engine. The method comprises the steps that an oil return temperature value is obtained, the working state of the pressure release valve is judged according to the preset temperature interval where the oil return temperature value is located, and an alarm mechanism is triggered according to the working state of the pressure release valve. According to the method, the critical failure and the failure state of the fuel pressure release valve are judged, an alarm is given to the failure of the fuel pressure release valve, the ECU can detect the failure, the effect of reminding workers is achieved, and the risk of engine failure caused by the failure of the pressure release valve is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of engine control, and more specifically, to a method for judging failure of a fuel pressure relief valve. Background Art

[0002] A pressure relief valve is a safety device that is used to release pressure when the system pressure exceeds a preset value to protect equipment and pipelines from overpressure damage. Pressure relief valves are usually installed on equipment or pipelines in a closed system and can automatically open and close according to the working pressure of the system to ensure that the medium pressure in the equipment is below the set value. This type of valve is widely used in many fields, including construction engineering, engineering technology, etc.

[0003] The pressure relief valve of an automobile is a protective device. Its function is to automatically open or close when the upper limit of the safe working pressure of the system is reached in the automobile pipeline to reduce the working pressure and ensure the safety of the system. The pressure relief valve, also known as a safety valve, is a device that can automatically open or close according to the working pressure of the system. It is generally installed on the equipment or pipeline of the closed system to protect the safety of the system.

[0004] The pressure relief valve is composed of multiple parts, including a needle valve, a pressure gauge, a main valve, a pilot valve, and a connecting pipe. The main valve is divided into an upper and lower part by a diaphragm, of which the lower chamber of the diaphragm is a water flow channel and the upper chamber is a control chamber, which controls the opening and closing of the main valve disc. When the system working pressure reaches the set value, the pressure relief valve will automatically open to release the pressure, thereby protecting the car engine and turbine. If the pressure relief valve does not work, it may cause problems such as engine overheating and turbine damage.

[0005] Pressure relief valves are usually installed in the intake and exhaust systems of a car engine to ensure the normal operation of the system. In the intake system, the pressure relief valve can prevent air from entering the engine and causing engine damage. In the exhaust system, the pressure relief valve can prevent the accumulation of exhaust gas and cause the engine to overheat.

[0006] For engines equipped with a mechanical pressure relief valve high-pressure fuel system, if the pressure relief valve fails and opens before reaching the opening pressure, the engine controller cannot detect the fault, and the pressure relief valve cannot maintain pressure, resulting in an increase in the return oil volume and a significant increase in the return oil temperature, which can easily cause engine failure. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a method for determining failure of a fuel pressure relief valve in view of the deficiencies in the prior art, so as to solve the technical problem that the existing ECU cannot detect the failure of the pressure relief valve, which leads to engine failure.

[0008] The present invention discloses a method for determining failure of a fuel pressure relief valve. The method comprises determining the working state of the pressure relief valve according to the preset temperature range in which the return oil temperature value is located, and triggering an alarm mechanism according to the working state of the pressure relief valve.

[0009] As a further improvement, the method for determining the working state of the pressure relief valve is:

[0010] Setting a first delay time and a second delay time, wherein the temperature interval includes a first temperature interval, a second temperature interval and a third temperature interval;

[0011] When the oil return temperature value is within the first temperature range, it is determined that the pressure relief valve is in a normal state;

[0012] When the oil return temperature value is within the second temperature range, the first delay time starts to count; when the first delay time is completed and the oil return temperature value is still within the second temperature range, it is determined that the pressure relief valve is in a critical failure state of the pressure relief valve;

[0013] When the return oil temperature value is within the third temperature range, the second delay time starts timing; when the second delay time is completed and the return oil temperature value is still within the third temperature range, it is determined that the pressure relief valve is in a pressure relief valve failure state.

[0014] Furthermore, the alarm mechanism is:

[0015] When the pressure relief valve is in a critical failure state, a critical failure alarm of the pressure relief valve is issued;

[0016] When the pressure relief valve is in a pressure relief valve failure state, a pressure relief valve failure alarm is issued.

[0017] Furthermore, a first temperature alarm value and a second temperature alarm value are set;

[0018] The temperature value in the first temperature interval is greater than zero and less than the first temperature alarm value;

[0019] The temperature value in the second temperature interval is greater than or equal to the first temperature alarm value and less than the second temperature alarm value;

[0020] The temperature value in the third temperature interval is greater than or equal to the second temperature alarm value.

[0021] Furthermore, the second temperature alarm value is 80°C-130°C.

[0022] Beneficial Effects

[0023] The advantages of the present invention are:

[0024] The present invention obtains the return oil temperature value by setting a plurality of temperature intervals, determines the working state of the pressure relief valve according to whether the return oil temperature value is in the temperature interval, triggers the alarm mechanism according to the working state of the pressure relief valve, realizes the determination of the critical failure and failure state of the fuel pressure relief valve, and alarms the failure of the fuel pressure relief valve. The ECU can detect the failure and serve as a reminder to the staff, thereby reducing the risk of engine failure caused by the failure of the pressure relief valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The figure is a flow chart of the method for determining failure of a fuel pressure relief valve according to the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the embodiments, but it does not constitute any limitation to the present invention. Any limited number of modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0027] See also Figure 1 The present invention provides a method for determining failure of a fuel pressure relief valve. The method includes setting multiple temperature intervals, obtaining the return oil temperature value, determining the working state of the pressure relief valve according to the return oil temperature value being in the temperature interval, and triggering an alarm mechanism according to the working state of the pressure relief valve. The critical failure and failure state of the fuel pressure relief valve can be determined, and an alarm can be issued for the failure of the fuel pressure relief valve, which can serve as a reminder to the staff and reduce the risk of engine failure caused by the failure of the pressure relief valve.

[0028] The multiple temperature intervals include a first temperature interval, a second temperature interval and a third temperature interval, and a first temperature alarm value and a second temperature alarm value are set.

[0029] The temperature value in the first temperature interval is greater than zero and less than the first temperature alarm value. When the return oil temperature value is in the first temperature interval, the pressure relief valve is in a normal state. There is no need to alarm for the working state of the pressure relief valve.

[0030] The temperature value in the second temperature interval is greater than or equal to the first temperature alarm value and less than the second temperature alarm value. When the return oil temperature value is in the second temperature interval, the preset first delay time starts timing; when the first delay time is completed and the return oil temperature value is still in the second temperature interval, it is determined that the pressure relief valve is in a critical failure state of the pressure relief valve, and a critical failure alarm of the pressure relief valve is issued. Setting the first delay time can reduce the error in determining the working state of the pressure relief valve. The engine ECU can detect the fault, serve as a reminder to the staff, and reduce the risk of engine failure due to a pressure relief valve failure.

[0031] The temperature value in the third temperature interval is greater than or equal to the second temperature alarm value. When the return oil temperature value is in the third temperature interval, the preset second delay time starts to count; when the second delay time is completed and the return oil temperature value is still in the third temperature interval, it is determined that the pressure relief valve is in a pressure relief valve failure state, and a pressure relief valve failure alarm is issued. Setting the second delay time can reduce the error in determining the working state of the pressure relief valve. The engine ECU can detect the fault and serve as a reminder to the staff, reducing the risk of engine failure due to a pressure relief valve failure.

[0032] The magnitude relationship between the first temperature alarm value and the second temperature alarm value is: first temperature alarm value<second temperature alarm value.

[0033] The second temperature alarm value is 80° C.-130° C. In this embodiment, the second temperature alarm value is 105° C., and the first temperature alarm value is 100° C. in this embodiment.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A method for determining failure of a fuel pressure relief valve, characterized in that: The method is to obtain a return oil temperature value, determine a working state of a pressure relief valve according to a preset temperature range in which the return oil temperature value is located, and trigger an alarm mechanism according to the working state of the pressure relief valve.

2. A method for determining failure of a fuel pressure relief valve according to claim 1, characterized in that: The method for determining the working state of the pressure relief valve is: Setting a first delay time and a second delay time, wherein the temperature interval includes a first temperature interval, a second temperature interval and a third temperature interval; When the oil return temperature value is within the first temperature range, it is determined that the pressure relief valve is in a normal state; When the oil return temperature value is within the second temperature range, the first delay time starts to count; when the first delay time is completed and the oil return temperature value is still within the second temperature range, it is determined that the pressure relief valve is in a critical failure state of the pressure relief valve; When the return oil temperature value is within the third temperature range, the second delay time starts to count; when the second delay time is completed and the return oil temperature value is still within the third temperature range, it is determined that the pressure relief valve is in a pressure relief valve failure state.

3. A method for determining failure of a fuel pressure relief valve according to claim 2, characterized in that: The alarm mechanism is: When the pressure relief valve is in a critical failure state, a critical failure alarm of the pressure relief valve is issued; When the pressure relief valve is in a pressure relief valve failure state, a pressure relief valve failure alarm is issued.

4. A method for determining failure of a fuel pressure relief valve according to claim 1, characterized in that: Setting a first temperature alarm value and a second temperature alarm value; The temperature value in the first temperature interval is greater than zero and less than the first temperature alarm value; The temperature value in the second temperature interval is greater than or equal to the first temperature alarm value and less than the second temperature alarm value; The temperature value in the third temperature interval is greater than or equal to the second temperature alarm value.

5. A method for determining failure of a fuel pressure relief valve according to claim 4, characterized in that: The second temperature alarm value is 80°C-130°C.

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