Target rotating speed control method for vehicle electronic oil pump

Abstract

The invention particularly discloses a target rotating speed control method for an electronic oil pump of a vehicle, which comprises the following steps: acquiring the temperature of a generator and the temperature of a driving motor of the vehicle, and calculating the requested target rotating speed of the electronic oil pump according to the temperature of the generator and the temperature of the driving motor; the oil pump temperature, the oil pump bus current and the clutch pressure intensity of the oil pump are obtained, signal analysis is conducted to determine the working state of the oil pump, whether the working state is within the normal range or not is judged, and if not, fault feedback is conducted; judging whether the vehicle is in a set special condition or not, and if yes, taking a set oil pump rotating speed corresponding to the set special condition as a target rotating speed; if not, the oil pump temperature, the oil pump bus current and the limiting rotating speed corresponding to the clutch pressure intensity are obtained, the target rotating speed of the electronic oil pump is comprehensively judged according to the current target rotating speed, the limiting rotating speed and the requested target rotating speed, and the supply amount and pressure of fuel oil are accurately controlled. Operation of the oil pump can be efficiently and intelligently controlled, and the supply amount of fuel oil can be accurately controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic oil pump control, and more specifically, to a method for controlling the rotational speed of an electronic oil pump for a vehicle. Background Art

[0002] An electronic oil pump is a highly integrated vehicle component that combines electronics, mechanics, and hydraulics. Depending on the application environment requirements and the type of drive motor, its control strategy varies. The control strategy typically involves using an ECU and related sensors to monitor the engine operating state and adjusting the power supply of the electronic oil pump to achieve the required pump rotational speed. The rotational speed of existing electronic oil pumps is affected by factors such as gear position information, component rotational speed information, torque demand, and rotational speed demand, which can easily cause target rotational speed deviation, potentially leading to problems such as inaccurate rotational speed control and difficulty in precise control. Therefore, how to accurately analyze the feedback signals of relevant sensors and components and efficiently and intelligently control the operation of the oil pump is of great significance. Summary of the Invention

[0003] The present invention provides a method for controlling the target rotational speed of an electronic oil pump for a vehicle, which solves the problem of inaccurate control of existing electronic oil pumps, can efficiently and intelligently control the operation of the oil pump, improve the precise control of the fuel supply amount, extend the service life of components, and enhance safety.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A method for controlling the target rotational speed of an electronic oil pump for a vehicle, comprising:

[0006] Obtain the generator temperature and drive motor temperature of the vehicle, and calculate the requested target rotational speed of the electronic oil pump based on the generator temperature and the drive motor temperature;

[0007] Obtain the oil pump temperature, oil pump bus current, and clutch pressure of the oil pump, and perform signal analysis to determine the working state of the oil pump and judge whether it is within the normal range. If not, perform a fault feedback;

[0008] Judge whether the vehicle is in a set special situation. If so, use the set oil pump rotational speed corresponding to the set special situation as the target rotational speed;

[0009] If not, obtain the limiting rotational speed corresponding to the oil pump temperature, the oil pump bus current, and the clutch pressure, and comprehensively determine the target rotational speed of the electronic oil pump based on the current target rotational speed, the limiting rotational speed, and the requested target rotational speed to precisely control the fuel supply amount and pressure.

[0010] Preferably, using the set oil pump rotational speed corresponding to the set special situation as the target rotational speed includes:

[0011] If the electric oil pump is not enabled, the target speed of the electric oil pump is 0;

[0012] If the requested target speed is less than 2500 rpm during reverse, the target speed of the electric oil pump is equal to 2500 rpm.

[0013] Preferably, determining the target speed of the electric oil pump based on the current target speed, the limit speed, and the requested target speed includes:

[0014] Judge whether the limit speed is greater than 4000 rpm. If so, the target speed of the electric oil pump is 4000 rpm. If not, the target speed of the electric oil pump is equal to the limit speed.

[0015] Preferably, determining the target speed of the electric oil pump based on the current target speed, the limit speed, and the requested target speed further includes:

[0016] Judge whether the requested target speed is greater than 250 rpm. If so, the target speed of the electric oil pump is equal to the requested target speed. If not, the target speed of the electric oil pump is 250 rpm.

[0017] Preferably, obtaining the limit speed corresponding to the oil pump temperature includes:

[0018] According to the formula: limit speed = current target speed + (110 - oil pump MOS temperature) * 5, calculate the limit speed corresponding to the oil pump temperature.

[0019] Preferably, obtaining the limit speed corresponding to the oil pump bus current includes:

[0020] According to the formula: limit speed = current target speed + (12 - oil pump bus current) * 5, calculate the limit speed corresponding to the oil pump bus current.

[0021] Preferably, obtaining the limit speed corresponding to the clutch pressure includes:

[0022] In the case where the clutch is not enabled, limit speed = current target speed + (200 - clutch pressure) / 5;

[0023] In the case where the clutch is enabled, if the limit speed is greater than 4000 rpm, the limit speed is equal to 4000 rpm.

[0024] Preferably, determining the requested target speed of the electric oil pump based on the generator temperature and the drive motor temperature includes:

[0025] The requested target speed is calculated according to the formula: target speed = Max (generator temperature, drive motor temperature) * 35 - 500.

[0026] Preferably, the slope of the change in the speed of the electronic oil pump does not exceed 500 rpm / s.

[0027] The present invention provides a method for controlling the target speed of an electronic oil pump for a vehicle. By monitoring parameters such as current, temperature, and clutch pressure, the target speed of the electronic oil pump is calculated, while taking into account the limitations of the oil pump bus current, oil pump temperature, and clutch pressure, to more accurately control the fuel supply volume and pressure. It solves the problem of inaccurate control of existing electronic oil pumps, can efficiently and intelligently control the operation of the oil pump, improve the accurate control of the fuel supply volume, extend the service life of components, and enhance safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below.

[0029] Figure 1 is a schematic diagram of a method for controlling the target speed of an electronic oil pump for a vehicle provided by the present invention.

[0030] Figure 2 is a logic flowchart of the target speed control provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below in conjunction with the drawings and embodiments.

[0032] Aiming at the problem of inaccurate control of the current electronic oil pump, the present invention provides a method for controlling the target speed of an electronic oil pump for a vehicle, which solves the problem of inaccurate control of existing electronic oil pumps, can efficiently and intelligently control the operation of the oil pump, improve the accurate control of the fuel supply volume, extend the service life of components, and enhance safety.

[0033] As Figure 1 and Figure 2 shown, a method for controlling the target speed of an electronic oil pump for a vehicle includes:

[0034] S1: Obtain the generator temperature and drive motor temperature of the vehicle, and calculate the requested target speed of the electronic oil pump according to the generator temperature and the drive motor temperature.

[0035] S2: Obtain the oil pump temperature, oil pump bus current, and clutch pressure of the oil pump, and perform signal analysis to determine the working state of the oil pump, and judge whether it is within the normal range. If not, a fault feedback is performed.

[0036] S3: Determine whether the vehicle is in a set special situation. If so, use the set oil pump speed corresponding to the set special situation as the target speed.

[0037] S4: If not, obtain the limit speeds corresponding to the oil pump temperature, the oil pump bus current, and the clutch pressure, and comprehensively determine the target speed of the electric oil pump based on the current target speed, the limit speed, and the requested target speed, so as to accurately control the supply volume and pressure of the fuel.

[0038] Specifically, the electric oil pump target speed system mainly consists of an input, a control function, and a diagnostic function. Among them, the input part consists of an oil pressure sensor, an oil temperature sensor, and an EOP system. The control function is realized by the analysis of the oil pressure, the analysis of the oil temperature, the determination of the oil pump enabling, the calculation of the oil pump target speed, and the clutch control system function. The diagnostic function consists of two systems: fault determination and classification, and fault handling. During normal driving, the electric oil pump target speed control system can accurately analyze the feedback signals of relevant sensors and components, control the operation of the oil pump, and the oil pressure, oil temperature, and oil pump are all within the normal range. If there is a fault, it will feedback through fault reporting and take the optimal handling measures. The input signal analysis is as follows: According to the voltage value fed back by the collected pressure sensor, look up the physical value of the oil pressure in the table based on the electrical characteristics of the pressure sensor; According to the electrical principle of the acquisition circuit, calculate the corresponding resistance value based on the collected voltage value, and look up the physical value of the oil temperature in the table based on the electrical characteristics of the temperature sensor; According to the gear information, component speed information, torque demand, and speed demand, etc., comprehensively determine the oil pump enabling condition. When the temperature is less than a certain value and there is no oil pump enabling demand, reset the oil pump enabling. This method accurately obtains the information of the electric oil pump and the clutch by installing a temperature sensor and a pressure sensor, and at the same time, through the detailed calculation of the oil pump target speed, taking into account the limitations of the oil pump bus current, oil pump temperature, and clutch pressure, more accurately controls the supply volume and pressure of the fuel, thereby improving the efficiency and performance of the engine.

[0039] Further, using the set oil pump speed corresponding to the set special situation as the target speed includes:

[0040] If the electric oil pump is not enabled, the target speed of the electric oil pump is 0;

[0041] If the requested target speed is less than 2500 rpm during reverse, the target speed of the electric oil pump is equal to 2500 rpm. If it exceeds 2500 rpm, no processing is performed.

[0042] Further, the method for comprehensively determining the target speed of the electronic oil pump based on the current target speed, the limit speed, and the requested target speed includes: determining whether the limit speed is greater than 4000 rpm. If so, the target speed of the electronic oil pump is 4000 rpm. If not, the target speed of the electronic oil pump is equal to the limit speed.

[0043] In practical applications, if the requested speed of the oil pump exceeds the limit speed, the requested speed of the oil pump is set equal to the limit speed.

[0044] Further, the method for comprehensively determining the target speed of the electronic oil pump based on the current target speed, the limit speed, and the requested target speed further includes: determining whether the requested target speed is greater than 250 rpm. If so, the target speed of the electronic oil pump is equal to the requested target speed. If not, the target speed of the electronic oil pump is 250 rpm.

[0045] Further, obtaining the limit speed corresponding to the oil pump temperature includes: calculating the limit speed corresponding to the oil pump temperature according to the formula: limit speed = current target speed + (110 - oil pump MOS temperature) * 5.

[0046] Further, obtaining the limit speed corresponding to the bus current of the oil pump includes: calculating the limit speed corresponding to the bus current of the oil pump according to the formula: limit speed = current target speed + (12 - bus current of the oil pump) * 5.

[0047] Further, obtaining the limit speed corresponding to the clutch pressure includes:

[0048] In the case where the clutch is not enabled, limit speed = current target speed + (200 - clutch pressure) / 5.

[0049] In the case where the clutch is enabled, if the limit speed is greater than 4000 rpm, the limit speed is equal to 4000 rpm.

[0050] Further, the method for determining the requested target speed of the electronic oil pump based on the generator temperature and the drive motor temperature includes: calculating the requested target speed according to the formula: target speed = Max(generator temperature, drive motor temperature) * 35 - 500.

[0051] By monitoring parameters such as current, temperature, and clutch pressure, this method can more accurately understand the current working state of the electronic oil pump. Based on the real-time feedback of these parameters, precise control of the speed of the electronic oil pump can be achieved, thereby more effectively regulating the fuel supply.

[0052] Furthermore, the slope of the change in the rotational speed of the electric fuel pump does not exceed 500 rpm / s. By effectively controlling the rotational speed of the electric fuel pump, the wear and damage of components can be reduced. Since the fuel pump operates at the optimal working state, unnecessary stress and wear can be reduced.

[0053] It can be seen that the present invention provides a target rotational speed control method for a vehicle electric fuel pump. By monitoring parameters such as current, temperature, and clutch pressure, the target rotational speed of the electric fuel pump is calculated, while taking into account the limitations of the fuel pump bus current, fuel pump temperature, and clutch pressure, to more precisely control the fuel supply volume and pressure. It solves the problem of inaccurate control of existing electric fuel pumps, can efficiently and intelligently control the operation of the fuel pump, improve the precision of controlling the fuel supply volume, extend the service life of components, and enhance safety.

[0054] The structure, features, and function effects of the present invention have been described in detail based on the illustrated embodiments above. The above are only the preferred embodiments of the present invention, but the present invention is not limited to the scope defined by the drawings. Any changes made according to the concept of the present invention, or equivalent embodiments modified into equivalent changes, that still do not exceed the spirit covered by the specification and the drawings should be within the protection scope of the present invention.

Claims

1. A target speed control method for a vehicle electronic oil pump, characterized in that: include: Acquiring a generator temperature and a drive motor temperature of the vehicle, and calculating a requested target speed of the electronic oil pump according to the generator temperature and the drive motor temperature; Obtain the oil pump temperature, oil pump bus current and clutch pressure of the oil pump, and perform signal analysis to determine the working status of the oil pump and whether it is within the normal range. If not, provide fault feedback; Determine whether the vehicle is in a set special condition, and if so, use the set oil pump speed corresponding to the set special condition as the target speed; If not, obtain the oil pump temperature, the oil pump bus current and the limit speed corresponding to the clutch pressure, and comprehensively determine the target speed of the electronic oil pump based on the current target speed, the limit speed and the requested target speed to accurately control the fuel supply and pressure.

2. The target speed control method for a vehicle electronic oil pump according to claim 1, characterized in that: The setting of the oil pump speed corresponding to the special situation as the target speed includes: If the electronic oil pump is not enabled, the target speed of the electronic oil pump is 0; If the requested target speed is less than 2500 rpm when reversing, the target speed of the electronic oil pump is equal to 2500 rpm.

3. The target speed control method for a vehicle electronic oil pump according to claim 2, characterized in that: The step of comprehensively determining the target speed of the electronic oil pump according to the current target speed, the limit speed and the requested target speed includes: It is determined whether the speed limit is greater than 4000 rpm. If so, the target speed of the electronic oil pump is 4000 rpm. If not, the target speed of the electronic oil pump is equal to the speed limit.

4. The target speed control method for a vehicle electronic oil pump according to claim 3, characterized in that: The step of comprehensively determining the target speed of the electronic oil pump according to the current target speed, the limit speed and the requested target speed also includes: It is determined whether the requested target speed is greater than 250 rpm. If so, the target speed of the electronic oil pump is equal to the requested target speed. If not, the target speed of the electronic oil pump is 250 rpm.

5. The target speed control method for a vehicle electronic oil pump according to claim 4, characterized in that: Obtaining the speed limit corresponding to the oil pump temperature, including: According to the formula: speed limit = current target speed + (110-oil pump MOS temperature) * 5, the speed limit corresponding to the oil pump temperature is calculated.

6. The target speed control method for a vehicle electronic oil pump according to claim 5, characterized in that: Obtaining the limited speed corresponding to the oil pump bus current, including: According to the formula: speed limit = current target speed + (12-oil pump bus current) * 5, the speed limit corresponding to the oil pump bus current is calculated.

7. The target speed control method for a vehicle electronic oil pump according to claim 6, characterized in that: Obtaining the speed limit corresponding to the clutch pressure includes: When the clutch is not enabled, the speed limit = current target speed + (200-clutch pressure) / 5; When the clutch is enabled, if the speed limit is greater than 4000 rpm, the speed limit is equal to 4000 rpm.

8. The target speed control method for a vehicle electronic oil pump according to any one of claims 1 to 7, characterized in that: The step of determining the requested target speed of the electronic oil pump according to the generator temperature and the drive motor temperature includes: The requested target speed is calculated according to the formula: target speed = Max (generator temperature, drive motor temperature) * 35-500.

9. The target speed control method for a vehicle electronic oil pump according to claim 8, characterized in that: The speed change slope of the electronic oil pump shall not exceed 500rpm / s.

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