A control method and system for preventing the erroneous opening of an engine pressure-limiting valve, and a diesel engine

Abstract

The present disclosure relates to a control method and system for preventing the opening of an engine pressure limiting valve and a diesel engine. The system is applied to a diesel engine, which comprises an injection pump, an injector, a mechanical fuel pump, an electric fuel pump and a fuel tank. The injection pump and the injector are connected to the fuel tank via a fuel return pipeline. The system comprises a fuel pressure sensor arranged on the fuel return pipeline between the injection pump and the mechanical fuel pump, which is configured to collect a pressure signal between the injection pump and the mechanical fuel pump; an electric control pressure limiting valve arranged on a low-pressure fuel inlet pipeline formed by the fuel tank and the electric fuel pump; and an electric control module connected to the electric control pressure limiting valve, which is configured to collect the pressure signal of the fuel pressure sensor and determine whether to open the electric control pressure limiting valve according to whether the fuel pressure collected by the fuel pressure sensor exceeds a preset threshold value and a current diesel engine speed operating state.

Description

Technical Field

[0001] This disclosure relates to the field of diesel engine control technology, and more specifically, to a control method, system, and diesel engine for preventing accidental opening of the engine pressure relief valve. Background Technology

[0002] To improve engine exhaust performance, an electric fuel pump is typically installed to assist with exhaust before engine start-up. Currently used electric fuel pumps operate for 3 minutes at a set time and then automatically stop, making them uncontrollable and prone to causing the engine pressure relief valve to open unintentionally. This affects engine operation and reduces the lifespan of the pressure relief valve.

[0003] How to control the fuel pressure at the return position of the fuel injection pump through the electronic control unit to prevent the engine pressure relief valve from opening accidentally has become an urgent technical problem to be solved. Summary of the Invention

[0004] The main objective of this invention is to solve the technical problem that there is no existing system or method that can control the fuel pressure at the return position of the fuel injection pump through the electronic control unit to prevent the engine pressure relief valve from opening erroneously.

[0005] To achieve the above technical objectives, this disclosure provides a control system for preventing the engine pressure relief valve from opening accidentally. The control system is applied to a diesel engine, which includes: a fuel injection pump, a fuel injector, a mechanical fuel pump, an electric fuel pump, and a fuel tank.

[0006] The fuel injection pump and the fuel injector respectively form a return oil pipeline with the fuel tank;

[0007] The control system for preventing accidental opening of the engine pressure relief valve includes:

[0008] A fuel pressure sensor is located on the return line between the fuel injection pump and the mechanical fuel transfer pump. The fuel pressure sensor is used to collect the pressure signal between the fuel injection pump and the mechanical fuel transfer pump.

[0009] An electrically controlled pressure relief valve is located on the low-pressure oil inlet pipeline formed by the oil tank and the electric oil pump;

[0010] The electronically controlled pressure relief valve is connected to an electronic control module. The electronic control module is used to collect the pressure signal from the fuel pressure sensor and determine whether to control the electronically controlled pressure relief valve to open based on whether the fuel pressure collected by the fuel pressure sensor exceeds a preset threshold and the current diesel engine speed.

[0011] To achieve the above-mentioned technical objectives, this disclosure also provides a control method for preventing the engine pressure relief valve from opening erroneously, which operates on the aforementioned control system for preventing the engine pressure relief valve from opening erroneously. The control method includes:

[0012] Power on the electronic control module to initiate the control to prevent the engine pressure relief valve from opening accidentally;

[0013] The system collects the pressure signal from the fuel pressure sensor and determines whether to open the electronically controlled pressure relief valve based on whether the fuel pressure collected by the fuel pressure sensor exceeds a preset threshold and the current operating speed of the diesel engine.

[0014] Furthermore, the step of acquiring the pressure signal from the fuel pressure sensor and determining whether to control the electronic pressure relief valve to open based on whether the fuel pressure acquired by the fuel pressure sensor exceeds a preset threshold, and the current diesel engine speed operating status, specifically includes:

[0015] The diesel engine speed signal is collected and it is determined whether the diesel engine speed signal is 0 to determine the current operating status of the diesel engine. If the diesel engine speed signal is 0, the current diesel engine is in a stopped state, the power supply to the electronic control module is stopped, and the electronic control pressure relief valve does not work.

[0016] When the diesel engine speed signal is not 0, the diesel engine is currently running. The pressure signal between the fuel injection pump and the mechanical fuel pump, which is collected by the fuel pressure sensor, is used to further determine whether it exceeds a preset threshold. If it exceeds the threshold, the electronic pressure limiting valve is activated to limit the pressure; if it does not exceed the threshold, the electronic pressure limiting valve is not activated.

[0017] To achieve the above-mentioned technical objectives, this disclosure also provides a diesel engine that utilizes the steps in the above-described control method for preventing accidental opening of the engine pressure relief valve.

[0018] The beneficial effects of this disclosure are:

[0019] This patent discloses that, without requiring significant changes to the low-pressure pipeline layout of the engine, by adding a fuel pressure sensor and an electric pressure relief valve, and supplementing it with a control strategy, the electronic control unit can effectively control the fuel pressure at the return position of the fuel injection pump, thereby preventing the problem of valve overrun caused by the engine pressure relief valve opening erroneously. The structure is simple. Attached Figure Description

[0020] Figure 1 A system block diagram of a control system for preventing accidental opening of an engine pressure relief valve according to Embodiment 1 of the present invention is shown;

[0021] Figure 2 A flowchart of a control method for preventing accidental opening of an engine pressure relief valve according to Embodiment 2 of the present invention is shown. Detailed Implementation

[0022] Embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the disclosure. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.

[0023] The accompanying drawings illustrate various structural schematics according to embodiments of the present disclosure. These drawings are not to scale, and some details have been enlarged and may have been omitted for clarity. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0024] Example 1:

[0025] like Figure 1 As shown:

[0026] This disclosure provides a control system for preventing accidental opening of an engine pressure relief valve, which operates on a diesel engine, the diesel engine including: a fuel injection pump, a fuel injector, a mechanical fuel pump, an electric fuel pump, and a fuel tank;

[0027] The fuel injection pump and the fuel injector respectively form a return oil pipeline with the fuel tank;

[0028] The control system for preventing accidental opening of the engine pressure relief valve includes:

[0029] A fuel pressure sensor is located on the return line between the fuel injection pump and the mechanical fuel transfer pump. The fuel pressure sensor is used to collect the pressure signal between the fuel injection pump and the mechanical fuel transfer pump.

[0030] An electrically controlled pressure relief valve is located on the low-pressure oil inlet pipeline formed by the oil tank and the electric oil pump;

[0031] The electronically controlled pressure relief valve is connected to an electronic control module. The electronic control module is used to collect the pressure signal from the fuel pressure sensor and determine whether to control the electronically controlled pressure relief valve to open based on whether the fuel pressure collected by the fuel pressure sensor exceeds a preset threshold and the current diesel engine speed.

[0032] Example 2:

[0033] like Figure 2 As shown:

[0034] To address the aforementioned technical problems, this disclosure also provides a control method for preventing the engine pressure relief valve from opening erroneously, which operates on the aforementioned control system for preventing the engine pressure relief valve from opening erroneously. The control method includes:

[0035] S201: Power on the electronic control module to initiate the control to prevent the engine pressure relief valve from opening accidentally;

[0036] S202: Collect the pressure signal from the fuel pressure sensor and determine whether to control the electronic pressure relief valve to open based on whether the fuel pressure collected by the fuel pressure sensor exceeds a preset threshold and the current diesel engine speed operation status.

[0037] Furthermore, the step of acquiring the pressure signal from the fuel pressure sensor and determining whether to control the electronic pressure relief valve to open based on whether the fuel pressure acquired by the fuel pressure sensor exceeds a preset threshold, and the current diesel engine speed operating status, specifically includes:

[0038] The diesel engine speed signal is collected and it is determined whether the diesel engine speed signal is 0 to determine the current operating status of the diesel engine. If the diesel engine speed signal is 0, the current diesel engine is in a stopped state, the power supply to the electronic control module is stopped, and the electronic control pressure relief valve does not work.

[0039] When the diesel engine speed signal is not 0, the diesel engine is currently running. The pressure signal between the fuel injection pump and the mechanical fuel pump, which is collected by the fuel pressure sensor, is used to further determine whether it exceeds a preset threshold. If it exceeds the threshold, the electronic pressure limiting valve is activated to limit the pressure; if it does not exceed the threshold, the electronic pressure limiting valve is not activated.

[0040] This patent discloses that, under the premise of ensuring minimal changes to the low-pressure pipeline layout, the fuel pressure sensor and electronically controlled pressure relief valve are added to the fuel injection pump return position to achieve the purpose of electronic control unit controlling the fuel injection pump return pressure.

[0041] The fuel pressure sensor and electric pressure relief valve are located on the pipeline connected to the fuel injection pump return passage and are connected to the electronic control unit (ECU) via wiring harness. When the ECU is powered on, it acquires the engine speed signal. When the engine speed is zero, there will be no valve overshooting issue, and the electric pressure relief valve does not need to operate. When the engine starts, it acquires the fuel pressure signal at the fuel injection pump return position and compares it with the calibrated pressure. When the actual pressure is greater than the calibrated pressure, the ECU controls the electric pressure relief valve to operate, maintaining the fuel injection pump return pressure within the required range. When the actual pressure is less than the calibrated pressure, the ECU controls the electric pressure relief valve to stop operating.

[0042] This patent discloses that, without requiring significant changes to the low-pressure pipeline layout of the engine, by adding a fuel pressure sensor and an electric pressure relief valve, and supplementing it with a control strategy, the electronic control unit can effectively control the fuel pressure at the return position of the fuel injection pump, thereby preventing the problem of valve overrun caused by the engine pressure relief valve opening erroneously. The structure is simple.

[0043] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. The scope of this disclosure is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this disclosure, and all such substitutions and modifications should fall within the scope of this disclosure.

Claims

1. A control system for preventing accidental opening of an engine pressure relief valve, acting on a diesel engine, the diesel engine comprising: Fuel injection pump, fuel injector, mechanical fuel pump, electric fuel pump, and fuel tank; The fuel injection pump and the fuel injector respectively form a return oil pipeline with the fuel tank; The system is characterized in that it comprises: A fuel pressure sensor is located on the return line between the fuel injection pump and the mechanical fuel transfer pump. The fuel pressure sensor is used to collect the pressure signal between the fuel injection pump and the mechanical fuel transfer pump. An electrically controlled pressure relief valve is located on the low-pressure oil inlet pipeline formed by the oil tank and the electric oil pump; The electronically controlled pressure relief valve is connected to an electronic control module. The electronic control module is used to collect the pressure signal from the fuel pressure sensor and determine whether to control the electronically controlled pressure relief valve to open based on whether the fuel pressure collected by the fuel pressure sensor exceeds a preset threshold and the current diesel engine speed.

2. A control method for preventing accidental opening of an engine pressure relief valve, applied to the control system for preventing accidental opening of an engine pressure relief valve as described in claim 1, characterized in that, The method includes: Power on the electronic control module to initiate the control to prevent the engine pressure relief valve from opening accidentally; The system collects the pressure signal from the fuel pressure sensor and determines whether to open the electronically controlled pressure relief valve based on whether the fuel pressure collected by the fuel pressure sensor exceeds a preset threshold and the current operating speed of the diesel engine.

3. The method according to claim 2, characterized in that, The process of acquiring the pressure signal from the fuel pressure sensor and determining whether to open the electronically controlled pressure relief valve based on whether the fuel pressure acquired by the fuel pressure sensor exceeds a preset threshold, and the current operating speed of the diesel engine, specifically includes: The diesel engine speed signal is collected and it is determined whether the diesel engine speed signal is 0 to determine the current operating status of the diesel engine. If the diesel engine speed signal is 0, the current diesel engine is in a stopped state, the power supply to the electronic control module is stopped, and the electronic control pressure relief valve does not work. When the diesel engine speed signal is not 0, the diesel engine is currently running. The pressure signal between the fuel injection pump and the mechanical fuel pump, which is collected by the fuel pressure sensor, is used to further determine whether it exceeds a preset threshold. If it exceeds the threshold, the electronic pressure limiting valve is activated to limit the pressure; if it does not exceed the threshold, the electronic pressure limiting valve is not activated.

4. A diesel engine, characterized in that, The diesel engine is equipped with a control system for preventing accidental opening of the engine pressure relief valve as described in claim 1, and the diesel engine utilizes the steps of the control method for preventing accidental opening of the engine pressure relief valve as described in any one of claims 2 or 3.

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