Clutch control system, clutch control method and vehicle

Abstract

The invention provides a clutch control system, a clutch control method and a vehicle. The system comprises an oil pool, an electronic oil pump, a target valve, a control oil way and a clutch. The control oil path is connected with the oil pool and the clutch; the electronic oil pump is connected with the oil pool and the control oil way, and the electronic oil pump is used for driving oil in the oil pool to be conveyed to the control oil way; the target valve is connected with the control oil path and the oil pool; when the clutch is engaged, the target valve is in a throttling state, and when the clutch is disengaged, the target valve is in a drainage state. According to the control system, the oil pressure of the control oil way can be controlled through the electronic oil pump and the target valve without adopting a plurality of pressure adjusting electromagnetic valves and pressure control valves, so that the engagement and disengagement control of the clutch is realized, the structure of the control system is simplified, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a clutch control system, a clutch control method and a vehicle. Background Art

[0002] With the development of automobile technology, most vehicles are equipped with a clutch, which is located between the engine and the gearbox. The power input from the engine to the gearbox can be cut off or transmitted through the disengagement and engagement of the clutch. Therefore, the control of the engagement and disengagement of the clutch is extremely important for the vehicle.

[0003] In the related art, multiple pressure regulating solenoid valves and pressure control valves are often used to control the oil pressure of the clutch control oil circuit. The control system is relatively complex and requires high costs. Summary of the invention

[0004] Embodiments of the present invention provide a clutch control system, a clutch control method and a vehicle to solve the problem of high clutch control cost in the prior art.

[0005] In a first aspect, an embodiment of the present invention provides a clutch control system, the system comprising an oil pool, an electronic oil pump, a target valve, a control oil circuit, and a clutch;

[0006] The control oil circuit is connected to the oil pool and the clutch;

[0007] The electronic oil pump is connected to the oil pool and the control oil circuit, and the electronic oil pump is used to drive the oil in the oil pool to be transported to the control oil circuit;

[0008] The target valve is connected to the control oil circuit and the oil pool;

[0009] When the clutch is engaged, the target valve is placed in a throttling state, and when the clutch is disengaged, the target valve is placed in a leaking state.

[0010] Optionally, the control oil circuit includes a pressure sensor;

[0011] The pressure sensor is used to detect the pressure of the control oil circuit.

[0012] Optionally, the system further comprises a controller;

[0013] The controller is connected to the pressure sensor, the electronic oil pump and the target valve;

[0014] The controller is used to control the rotation speed of the electronic oil pump;

[0015] The controller is used to control the working state of the target valve.

[0016] Optionally, the system further comprises a suction filter;

[0017] The suction filter is connected to the oil pool and the control oil circuit;

[0018] The suction filter is used for filtering oil.

[0019] Optionally, the control oil circuit includes an accumulator.

[0020] In a second aspect, an embodiment of the present invention provides a clutch control method, which is applied to the clutch control system described in the first aspect, and includes:

[0021] In response to a clutch engagement request, switching an operating state of a target valve in the clutch control system to a throttling state;

[0022] Setting the rotation speed of the electronic oil pump in the clutch control system to a first rotation speed;

[0023] When it is determined that the clutch in the clutch control system meets the engagement condition, the rotation speed of the electronic oil pump is set to a second rotation speed, and the electronic oil pump is controlled to increase the speed until the clutch meets the preset engagement requirement.

[0024] Optionally, before setting the rotation speed of the electronic oil pump in the clutch control system to the first rotation speed, the method further includes:

[0025] acquiring a pre-engagement pressure of a control oil circuit in the clutch control system;

[0026] A first speed is determined based on the pre-engagement pressure.

[0027] Optionally, before setting the rotation speed of the electronic oil pump in the clutch control system to the first rotation speed, the method further includes:

[0028] Obtaining a target torque of the engine;

[0029] determining a target pressure of a control oil circuit in the clutch control system based on the target torque;

[0030] A second rotation speed is determined based on the target pressure.

[0031] Optionally, the method further comprises:

[0032] Obtaining the driving end speed and the driven end speed of the clutch;

[0033] When the speed difference between the driving end speed and the driven end speed is not greater than a preset difference threshold, it is determined that the clutch meets the engagement condition.

[0034] Optionally, the method further comprises:

[0035] Acquiring a current pressure of a control oil circuit in the clutch control system;

[0036] When the current pressure falls within a preset pressure range, it is determined that the clutch meets a preset engagement requirement.

[0037] In a third aspect, an embodiment of the present invention provides an electronic device, comprising: a processor, a communication interface, a memory, and a communication bus; wherein the processor, the communication interface, and the memory communicate with each other via the communication bus;

[0038] Memory, used to store computer programs;

[0039] The processor is used to implement the steps of the clutch control method described in the second aspect when executing the program stored in the memory.

[0040] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the clutch control method described in the second aspect above.

[0041] In a fifth aspect, an embodiment of the present invention provides a vehicle, comprising the clutch control system described in the first aspect above.

[0042] Compared with the prior art, the present invention has the following advantages:

[0043] In the embodiment of the present invention, it is not necessary to use multiple pressure regulating solenoid valves and pressure control valves. Instead, a hydraulic clutch control system including a target valve and an electronic oil pump is used. The oil in the oil pool is input into the control oil circuit through the electronic oil pump, which can increase the pressure of the control oil circuit and realize the clutch engagement operation. At the same time, the embodiment of the present invention adopts a target valve including a throttling state and a leakage state. When the clutch is engaged, the pressure balance of the control oil circuit can be maintained by placing the target valve in a throttling state. Correspondingly, when the clutch is disengaged, the control oil circuit can be quickly depressurized by placing the target valve in a leakage state. In the embodiment of the present invention, it is not necessary to use multiple pressure regulating solenoid valves and pressure control valves. The oil pressure of the control oil circuit can be controlled by an electronic oil pump and a target valve, thereby realizing the engagement and separation control of the clutch, simplifying the structure of the control system and reducing the cost.

[0044] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below.

[0046] Figure 1 is a schematic structural diagram of a clutch control system provided by an embodiment of the present invention;

[0047] Figure 2 is a schematic structural diagram of another clutch control system provided by an embodiment of the present invention;

[0048] Figure 3 is a structural schematic diagram of another clutch control system provided by an embodiment of the present invention;

[0049] Figure 4 is a schematic structural diagram of another clutch control system provided by an embodiment of the present invention;

[0050] Figure 5 is a structural schematic diagram of another clutch control system provided by an embodiment of the present invention;

[0051] Figure 6 is a flow chart of steps of a clutch control method provided by an embodiment of the present invention;

[0052] Figure 7 is a flowchart of another clutch control method provided by an embodiment of the present invention;

[0053] Figure 8 A block diagram of an electronic device provided by an embodiment of the present invention.

[0054] Reference numerals:

[0055] 1- oil pool, 2- electronic oil pump, 3- target valve, 4- control oil circuit, 5- clutch, 41- pressure sensor, 42- accumulator, 6- controller, 7- suction filter. DETAILED DESCRIPTION

[0056] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can also be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0057] Figure 1 is a schematic diagram of a clutch control system provided by an embodiment of the present invention. Figure 1 As shown, the clutch control system includes an oil pool 1, an electronic oil pump 2, a target valve 3, a control oil circuit 4 and a clutch 5.

[0058] The control oil circuit 4 connects the oil pool 1 and the clutch 5; the electronic oil pump 2 is connected to the oil pool 1 and the control oil circuit 4, and the electronic oil pump 2 is used to drive the oil in the oil pool 1 to be transported to the control oil circuit 4; the target valve 3 connects the control oil circuit 4 and the oil pool 1.

[0059] The electronic oil pump refers to an oil pump that can be electrically controlled, and the oil pump can suck oil from the oil pool and pump it into the control oil circuit. The electronic oil pump in the embodiment of the present invention can be a high-pressure electronic oil pump, which is more suitable for the clutch control system in the vehicle.

[0060] Specifically, the above-mentioned control oil circuit connects the oil pool and the clutch. The front end of the control oil circuit can be connected to the oil outlet of the oil pool, and the rear end is connected to the oil inlet of the clutch. Therefore, the oil in the oil pool can be input into the clutch cavity through the control oil circuit, and the engagement and disengagement of the clutch can be controlled by the oil pressure.

[0061] Furthermore, the electronic oil pump can be connected to the control oil circuit and the oil pool, and the oil in the oil pool can be driven to be transported to the control oil circuit by the electronic oil pump. Specifically, the oil suction port of the electronic oil pump can be connected to the oil pool, and the oil outlet can be connected to the control oil circuit. The electronic oil pump can serve as a power source for the clutch control system and provide hydraulic oil for the system.

[0062] The above-mentioned oil pool refers to a device for storing hydraulic oil, which is usually an oil pan composed of a gearbox housing and is used to store the hydraulic oil inside the gearbox.

[0063] Wherein, the target valve can be a solenoid valve or a reversing valve, so that the target valve can include at least two working states. Specifically, the target valve can include two working states: a throttling state and a leakage state. When the clutch is engaged, the target valve is placed in a throttling state, and when the clutch is disengaged, the target valve is placed in a leakage state. The target valve is connected to the control oil circuit and the oil pool. In the throttling state, the oil can flow through the fixed throttling hole of the target valve. Correspondingly, in the leakage state, the oil can flow through the leakage aperture of the target valve. The leakage aperture is much larger than the fixed throttling hole. Therefore, when the target valve is in the leakage state, the oil in the control oil circuit can quickly flow into the oil pool, so that the control oil circuit is quickly depressurized.

[0064] Furthermore, if Figure 1As shown, when the target valve is in the throttling state, the oil in the control oil circuit can flow into the oil pool through the throttling hole of the target valve, so that during the clutch engagement process, the electronic oil pump can be used to increase the pressure of the control oil circuit while avoiding excessive pressure increase, and the target valve can maintain the pressure balance of the control oil circuit. Correspondingly, when the target valve is in the leakage state, the oil in the control oil circuit can flow quickly into the oil pool through the leakage hole of the target valve, so that the control oil circuit can be quickly depressurized through the target valve, so that the clutch is disengaged.

[0065] The clutch control system provided in the embodiment of the present invention can receive an engagement instruction sent by the vehicle controller when the clutch needs to be engaged, that is, when the engine needs to be directly driven, and send a speed instruction to the oil pump based on the engagement instruction to perform closed-loop control on the oil pump speed. At this time, the high-pressure electronic oil pump starts to work and sends a throttling instruction to the target valve, so that the target valve is placed in a throttling state. Figure 5 The target valve is in the right position, and the hydraulic oil flowing through the throttle hole will inevitably produce a pressure drop. Since the pressure upstream of the throttle hole is equal to the pressure of the control oil circuit, the downstream of the throttle hole is connected to the oil pan, and the pressure is zero, based on the small hole flow formula, Among them, Q represents the flow through the orifice, Cd represents the flow coefficient, which is a dimensionless coefficient, and its value can be between 0.61 and 0.62. A represents the cross-sectional area of ​​the orifice, that is, the cross-sectional area of ​​the orifice, ρ represents the mass density of the liquid, which indicates the mass of the liquid per unit volume, and ΔP represents the pressure difference before and after the orifice. From the above orifice flow formula, it can be seen that the control oil circuit pressure is proportional to the flow through the throttle hole, that is: the speed of the electronic oil pump increases, the flow increases accordingly, and the control oil circuit pressure also increases continuously. At this time, the clutch can complete the whole process from pre-charging to sliding friction and then to full compression and engagement. During this process, the oil pump speed has been increasing. The pressure sensor can detect that the main oil circuit pressure reaches the set value tolerance range (usually ±0.5bar). The speed of the high-pressure electronic oil pump will remain unchanged. When the pressure sensor detects a drop, the controller will increase the oil pump speed to keep the main oil circuit pressure within the set value tolerance range.

[0066] Correspondingly, when the clutch is disengaged, the controller can control the high-pressure electronic oil pump to stop working and set the working state of the target valve to the leakage state. At this time, the flow mode of the target valve is the leakage hole. Figure 5 The target valve in the clutch is in the left position, which controls the oil circuit pressure to be released quickly, so that the clutch can separate the driving and driven ends.

[0067] In summary, in the above implementation process, the embodiment of the present invention does not need to adopt multiple pressure regulating solenoid valves and pressure control valves, but adopts a hydraulic clutch control system including a target valve and an electronic oil pump. The oil in the oil pool is input into the control oil circuit through the electronic oil pump, which can increase the pressure of the control oil circuit and realize the clutch engagement operation. At the same time, the embodiment of the present invention adopts a target valve including a throttling state and a leakage state. When the clutch is engaged, the pressure balance of the control oil circuit can be maintained by placing the target valve in a throttling state. Correspondingly, when the clutch is disengaged, the control oil circuit can be quickly depressurized by placing the target valve in a leakage state. The embodiment of the present invention does not need to adopt multiple pressure regulating solenoid valves and pressure control valves. The oil pressure of the control oil circuit can be controlled by an electronic oil pump and a target valve, thereby realizing the engagement and separation control of the clutch, simplifying the structure of the control system and reducing costs.

[0068] Optionally, Figure 2 is a schematic diagram of the structure of another clutch control system provided by an embodiment of the present invention. Figure 2 As shown, the control oil circuit 4 includes a pressure sensor 41 .

[0069] Among them, the pressure sensor is used to detect the pressure of the control oil circuit.

[0070] Specifically, the pressure sensor can be arranged in the control oil circuit to monitor the pressure value of the control oil circuit in real time. Specifically, the embodiment of the present invention can select a corresponding pressure sensor according to actual conditions, and the embodiment of the present invention does not limit the model of the pressure sensor.

[0071] The oil pressure in the control oil circuit can be monitored by the pressure sensor to avoid abnormal situations.

[0072] Optionally, Figure 3 is a schematic diagram of the structure of another clutch control system provided by an embodiment of the present invention, such as Figure 3 As shown, the clutch control system further includes a controller 6 .

[0073] The controller 6 is connected to the pressure sensor 41, the electronic oil pump 2 and the target valve 3. Specifically, the controller is used to control the rotation speed of the electronic oil pump and to control the working state of the target valve.

[0074] The controller may be a vehicle controller or a separate control device, which is not limited in the embodiments of the present invention. Specifically, the controller may obtain the pressure of the control oil circuit monitored by the pressure sensor by connecting to the pressure sensor, and then the controller may control the speed of the electronic oil pump and the working state of the target valve based on the pressure of the control oil circuit.

[0075] By setting a controller, the embodiment of the present invention can obtain the pressure of the control oil circuit monitored by the pressure sensor, and then the controller can control the speed of the electronic oil pump and the working state of the target valve based on the pressure of the control oil circuit, thereby realizing the integration of the clutch control system.

[0076] Optionally, Figure 4 is a schematic diagram of the structure of another clutch control system provided by an embodiment of the present invention. Figure 4 As shown, the clutch control system further includes a suction filter 7 .

[0077] Specifically, the suction filter is connected to the oil pool and the control oil circuit, and the suction filter is used to filter the oil.

[0078] Specifically, the above-mentioned suction filter refers to a device for separating impurities in oil, which may include filter cloth and a porous plate. The fluid to be filtered passes through the filter cloth and the porous plate, and the impurities are retained on the filter cloth and the porous plate, while the oil passes normally, thereby achieving separation of impurities and oil.

[0079] Specifically, the suction filter in the embodiment of the present invention can be arranged at the front end of the electronic oil pump and connected to the oil pool, so that the oil driven by the electronic oil pump is filtered by the suction filter, which can filter out impurities in the hydraulic oil and ensure the cleanliness of the oil entering the control oil circuit.

[0080] The embodiment of the present invention provides a suction filter to connect the oil pool and the control oil circuit, and can filter impurities in the oil through the suction filter to ensure the cleanliness of the oil entering the control oil circuit, avoid device jamming caused by the cleanliness of the oil, and reduce the cost and failure rate of the entire hydraulic system.

[0081] Optionally, Figure 5 is a schematic diagram of the structure of another clutch control system provided by an embodiment of the present invention, such as Figure 5 As shown, the control oil circuit includes an accumulator 42 .

[0082] Among them, the accumulator refers to an energy storage device in the hydraulic system, which can convert compression energy or potential energy into hydraulic or air pressure and release it to replenish the system. At the same time, when the system pressure increases instantly, it can absorb this part of the energy to ensure the normal pressure of the entire system.

[0083] Specifically, the accumulator in the embodiment of the present invention can be arranged in the control oil circuit to absorb the pressure fluctuation of the control oil circuit, so as to avoid the sudden change of the pressure of the control oil circuit, maintain the pressure balance of the control oil circuit, and avoid the damage of the control oil circuit and the clutch caused by the sudden change of pressure.

[0084] Figure 6is a flow chart of steps of a clutch control method provided by an embodiment of the present invention, which can be applied to the above clutch control system, such as Figure 6 As shown, the method may include:

[0085] Step 101: In response to a clutch engagement request, switch the working state of a target valve in the clutch control system to a throttling state.

[0086] Step 102: Set the rotation speed of the electronic oil pump in the clutch control system to a first rotation speed.

[0087] Step 103: When it is determined that the clutch in the clutch control system meets the engagement condition, the speed of the electronic oil pump is set to a second speed, and the electronic oil pump is controlled to increase the speed until the clutch meets the preset engagement requirement.

[0088] Among them, the above-mentioned clutch engagement request can be sent by the vehicle controller. At this time, the vehicle engine often needs to be directly driven and the clutch needs to be engaged. In this case, it is necessary to increase the pressure of the control oil circuit so that the active end and the driven end of the clutch are engaged. In this case, the working state of the target valve can be switched to a throttling state to avoid rapid pressure relief of the control oil circuit while ensuring the pressure balance of the control oil circuit and avoiding excessive pressure increase in the control oil circuit. In addition, the clutch control method provided in the embodiment of the present invention can be implemented by a vehicle controller or by a controller in a clutch control system, and the embodiment of the present invention does not limit this.

[0089] The first speed may be obtained by pre-calibrating the vehicle and the clutch, and may be the operating speed of the electronic oil pump corresponding to the pre-fill oil pressure of the clutch. The pre-fill oil pressure may be obtained by pre-calibrating the vehicle and the clutch, and refers to the pressure node at which the clutch begins to engage. Furthermore, the embodiment of the present invention may calculate the first speed based on the pre-fill oil pressure, or may obtain the first speed corresponding to the pre-fill oil pressure by pre-calibrating the clutch.

[0090] Furthermore, the embodiment of the present invention can pre-fill the clutch with oil by setting the speed of the electronic oil pump to the first speed, so that the clutch enters the engagement stage. Specifically, the pre-filling of oil can eliminate the clutch idle stroke, thereby improving the response speed of the clutch engagement, and avoiding the damage to the device caused by the clutch idle stroke.

[0091] Furthermore, during the pre-oil filling stage, the electronic oil pump runs at a first speed, and the pressure of the control oil circuit gradually increases. In this case, the generator often starts to adjust the speed to prepare for the subsequent clutch engagement.

[0092] The above-mentioned engagement condition refers to a situation where the clutch can be engaged. In one case, the above-mentioned engagement condition may be that the speed of the active end and the driven end of the clutch are synchronized. In this case, starting the engagement can ensure the efficiency of the engagement.

[0093] The above-mentioned preset engagement requirement may be that the clutch is fully engaged. Specifically, the clutch often needs to control the oil circuit pressure to be maintained within a certain range from the pre-oil filling stage to the full engagement from the slipping wear. Therefore, the above-mentioned preset engagement requirement may be that the oil circuit pressure reaches a preset pressure threshold. Of course, the above-mentioned preset engagement requirement may also be set according to the actual conditions of different vehicles and different clutches, and the embodiment of the present invention does not limit this.

[0094] The second speed refers to the operating speed corresponding to the control oil circuit pressure that allows the clutch to be fully engaged. Specifically, since different engines require different torques, the control oil circuit pressure required by the clutch is also different accordingly. In this case, the embodiment of the present invention can first obtain the torque required by the engine, and calculate the engagement pressure required by the clutch based on the required torque, and then calculate the second speed according to the engagement pressure.

[0095] Furthermore, when the engagement condition is met, the speed of the electronic oil pump can be set to the second speed. At this time, the electronic oil pump starts to run at the second speed, and the control oil circuit pressure will rise rapidly. In this case, the embodiment of the present invention can also control the electronic oil pump to increase the speed so that the clutch meets the preset engagement requirements. Specifically, the speed increase operation can be performed according to a certain gradient, for example, it can be performed according to a gradient of 200rpm. Of course, other speed increase methods or other gradients can also be set, and the embodiment of the present invention does not limit this.

[0096] Specifically, after the electronic oil pump starts to run at the second speed, if the clutch has met the preset engagement requirements, the electronic oil pump can be maintained at the second speed, and the clutch can be monitored in real time to see whether it meets the preset engagement requirements. Through closed-loop control, the clutch can be maintained to meet the preset engagement requirements, thereby realizing the clutch engagement process.

[0097] Specifically, Figure 5 As shown, in the clutch control system provided by the embodiment of the present invention, when the clutch needs to be engaged, that is, the engine needs to be directly driven, the controller can receive an engagement instruction sent by the vehicle controller, send a speed instruction to the oil pump based on the engagement instruction, and perform closed-loop control on the oil pump speed. At this time, the high-pressure electronic oil pump starts to work and sends a throttling instruction to the target valve, so that the target valve is placed in a throttling state. Figure 5The target valve is in the right position, and the hydraulic oil flowing through the throttle hole will inevitably produce a pressure drop. Since the pressure upstream of the throttle hole is equal to the pressure of the control oil circuit, the downstream of the throttle hole is connected to the oil pan, and the pressure is zero, based on the small hole flow formula, Among them, Q represents the flow through the orifice, Cd represents the flow coefficient, which is a dimensionless coefficient, and its value can be between 0.61 and 0.62. A represents the cross-sectional area of ​​the orifice, that is, the cross-sectional area of ​​the orifice, ρ represents the mass density of the liquid, which indicates the mass of the liquid per unit volume, and ΔP represents the pressure difference before and after the orifice. From the above orifice flow formula, it can be seen that the control oil circuit pressure is proportional to the flow through the throttle hole, that is: the speed of the electronic oil pump increases, the flow increases accordingly, and the control oil circuit pressure also increases continuously. At this time, the clutch can complete the whole process from pre-charging to sliding friction and then to full compression and engagement. During this process, the oil pump speed has been increasing. The pressure sensor can detect that the main oil circuit pressure reaches the set value tolerance range (usually ±0.5bar). The speed of the high-pressure electronic oil pump will remain unchanged. When the pressure sensor detects a drop, the controller will increase the oil pump speed to keep the main oil circuit pressure within the set value tolerance range.

[0098] Correspondingly, when the clutch is disengaged, the controller can control the high-pressure electronic oil pump to stop working and set the working state of the target valve to the leakage state. At this time, the flow mode of the target valve is the leakage hole. Figure 5 The target valve in the clutch is in the left position, which controls the oil circuit pressure to be released quickly, so that the clutch can separate the driving and driven ends.

[0099] At the same time, in the embodiment of the present invention, the electronic oil pump is only required to work when the clutch needs to be engaged, and the electronic oil pump can be directly turned off when the clutch is disengaged, thereby improving the control efficiency of the entire system.

[0100] In summary, the clutch control method provided in the embodiment of the present invention switches the working state of the target valve in the clutch control system to a throttling state in response to a clutch engagement request; sets the speed of the electronic oil pump in the clutch control system to a first speed; and when it is determined that the clutch in the clutch control system meets the engagement conditions, sets the speed of the electronic oil pump to a second speed, and controls the electronic oil pump to increase the speed until the clutch meets the preset engagement requirements. In this way, the embodiment of the present invention can achieve clutch engagement control by switching the working state of the target valve and setting the speed of the electronic oil pump without controlling multiple pressure regulating valves and pressure control valves, which greatly simplifies the clutch control process, improves the reliability of the clutch control system, and improves the efficiency of the entire clutch control system.

[0101] Optionally, before the operation of setting the rotation speed of the electronic oil pump in the clutch control system to the first rotation speed, the embodiment of the present invention further includes:

[0102] S21. Obtaining the pre-engagement pressure of the control oil circuit in the clutch control system.

[0103] S22. Determine a first rotation speed based on the pre-engagement pressure.

[0104] The above-mentioned pre-engagement pressure refers to the pre-filling oil pressure, which can be obtained by pre-calibrating the clutch of the vehicle.

[0105] Furthermore, the first speed can be calculated based on the small hole flow formula and the flow speed formula. Specifically, based on the small hole flow formula: At the same time, based on the flow speed formula: Q = v*n, where the above v represents the displacement of the oil pump, which can be directly obtained based on the properties of the electronic oil pump, and the above n represents the speed of the electronic oil pump. At the same time, since the pressure difference before and after the small hole is actually equivalent to the pressure of the control oil circuit, on this basis, based on the above formula, it can be inferred that: Then, by substituting the pre-engagement pressure into ΔP in the above formula, n can be calculated as the first speed.

[0106] Further, after the first rotational speed is determined, the rotational speed of the electronic oil pump may be set to the first rotational speed to pre-fill the clutch with oil.

[0107] This step controls the speed of the electronic oil pump for clutch pre-filling oil. The oil pump operating speed is calculated as the first speed based on the clutch pre-filling oil pressure. At this stage, the electronic oil pump speed is open-loop controlled. The clutch pre-filling oil process is mainly to eliminate the clutch idle stroke and improve the response speed of the clutch engagement.

[0108] Optionally, before the operation of setting the rotation speed of the electronic oil pump in the clutch control system to the first rotation speed, the embodiment of the present invention may further include:

[0109] S31: Obtain target torque of the engine.

[0110] S32. Determine a target pressure of a control oil circuit in the clutch control system based on the target torque.

[0111] S33. Determine a second rotation speed based on the target pressure.

[0112] The target torque refers to the torque that the engine needs to transmit. At this time, the electronic oil pump often runs at the first speed for a preset time, and the engine needs to transmit torque through clutch engagement. The target torque can be sent by the vehicle controller, or it can be actively requested by the embodiment of the present invention to obtain the vehicle controller, which is not limited by the embodiment of the present invention.

[0113] Further, after the target torque is obtained, the target pressure corresponding to the target torque can be determined, and the target pressure refers to the engagement pressure required for the target torque. Specifically, the target pressure can be calculated using the engine torque formula.

[0114] Specifically, based on the engine torque formula: T = f*F*z*R c , where T represents the engine transmission torque, f represents the static friction coefficient of the friction surface, which is usually a fixed value and can be 0.25 to 0.3. The above F represents the working pressure applied to the friction surface, and the above R c Characterizes the average friction radius of the friction plate, which is directly related to the hardware size of the vehicle, is a fixed value and can be obtained in advance. Further, based on the pressure formula: F = P*S = P*πR c 2 , and then based on the above engine torque formula, F can be obtained, and then based on the pressure formula, P can be obtained as the above target pressure.

[0115] Furthermore, after obtaining the target pressure, the operating speed corresponding to the target pressure can be further calculated as the second speed. Specifically, the calculation method of the second speed can also be based on the orifice flow formula and the flow speed formula, which will not be repeated here.

[0116] Specifically, after the electronic oil pump is set to the first speed, the vehicle generator is often speed-regulated, and the clutch master and slave ends are speed-regulated to prepare for subsequent engagement. At the same time, the embodiment of the present invention obtains the torque (target torque) required to be transmitted by the engine, calculates the engagement pressure (target pressure) required for the clutch based on the transmitted torque, and then calculates the second speed of the electronic oil pump based on the engagement pressure.

[0117] In this way, the clutch engagement process can be accurately controlled through the above steps to ensure the realization of clutch engagement.

[0118] Optionally, the embodiment of the present invention may further include:

[0119] S41, obtaining the driving end rotation speed and the driven end rotation speed of the clutch.

[0120] S42: When the speed difference between the driving end speed and the driven end speed is not greater than a preset difference threshold, determining that the clutch meets the engagement condition.

[0121] The clutch generally includes an active end and a passive end or a driven end. The active end is generally composed of a flywheel, a pressure plate and a clutch cover, and the driven end is generally composed of a driven plate and a driven shaft. The engagement of the clutch requires the two to reach a synchronous state. On this basis, the embodiment of the present invention can determine whether the synchronous state is reached based on the speed difference between the two.

[0122] Specifically, the above-mentioned active end speed and driven end speed can be obtained through the speed sensor of the clutch. Specifically, the clutch can be equipped with an active end speed sensor and a driven end speed sensor, and the speeds of both ends can be monitored in real time based on the speed sensor. On this basis, the embodiment of the present invention can obtain the above-mentioned active end speed and driven end speed by reading the monitoring value of the speed sensor.

[0123] Furthermore, the absolute value of the difference between the driving end speed and the driven end speed can be taken as the speed difference. It can be understood that the smaller the speed difference, the more synchronized the two are. On this basis, the embodiment of the present invention can set a preset difference threshold. When the speed difference is not greater than the preset difference threshold, it can be determined that the speeds of the driving end and the driven end are close and the two reach a synchronized state. At this time, it can be determined that the clutch meets the engagement conditions.

[0124] Accordingly, when the speed difference is greater than the preset difference threshold, it can be determined that the speed difference between the driving end and the driven end is large, and the two have not yet reached the synchronous state. At this time, it can be determined that the clutch does not meet the engagement condition. Further, when the engagement condition is not met, the vehicle generator can continue to adjust the speed until the clutch meets the engagement condition.

[0125] Furthermore, the preset difference threshold can be set by oneself, for example, it can be set to 50rpm, and of course it can also be set to 40, 30, 60rpm, etc. according to the actual situation of the vehicle, and the embodiment of the present invention does not limit this.

[0126] In the embodiment of the present invention, by obtaining the active end speed and the driven end speed of the clutch, and when the speed difference between the active end speed and the driven end speed is not greater than a preset difference threshold, it is determined that the clutch meets the engagement condition. In this way, the clutch can be engaged when the difference between the active end speed and the driven end speed of the clutch is small, avoiding the engagement failure caused by a large difference, and improving the accuracy of clutch control.

[0127] Optionally, the embodiment of the present invention may further include:

[0128] S51. Obtain the current pressure of the control oil circuit in the clutch control system.

[0129] S52: When the current pressure is within a preset pressure range, determine that the clutch meets a preset engagement requirement.

[0130] The above-mentioned current pressure can be obtained based on the monitoring of the pressure sensor in the control oil circuit, or it can also be obtained by monitoring the fuel pressure gauge. Specifically, a pressure sensor can be configured for the control oil circuit in the clutch control system to monitor the oil pressure of the control oil circuit in real time, or a fuel pressure gauge can be configured in the control oil circuit to monitor the oil pressure of the control oil circuit. Furthermore, the monitoring value of the pressure sensor or the fuel pressure gauge can be actively obtained, or the monitoring value sent by the pressure sensor or the fuel pressure gauge can be received to obtain the above-mentioned current pressure, and the embodiment of the present invention does not limit this.

[0131] The preset pressure range may be pre-set, may be a pressure range required to maintain clutch engagement, or may be a pressure range obtained by the pressure value required for clutch engagement ± tolerance, the tolerance may be 0.5 bar, or other values, and the embodiment of the present invention does not limit this. The pressure value required for engagement may be obtained by pre-calibrating the clutch of the vehicle, and at this pressure value, the clutch can be maintained in an engaged state.

[0132] Furthermore, when the current pressure is within the preset pressure range, it indicates that the pressure provided by the current control oil circuit to the clutch has reached the engagement pressure, and the clutch can be guaranteed to complete the engagement process.

[0133] In the embodiment of the present invention, by acquiring the current pressure of the control oil circuit in the clutch control system, and when the current pressure falls within the preset pressure range, it is determined that the clutch meets the preset engagement requirement. In this way, the clutch engagement can be effectively achieved and the accuracy of the clutch engagement control can be improved.

[0134] Optionally, Figure 7 is a flowchart of another clutch control method provided by an embodiment of the present invention. Figure 7As shown, in response to the clutch engagement request, the high-pressure electronic oil pump speed and main oil circuit pressure and other information are obtained, and the controller can calculate the first working speed n1 (first speed) of the electronic oil pump corresponding to the clutch pre-filling oil pressure P1 (pre-engagement pressure), so that the electronic oil pump runs at the speed n1 to pre-fill the clutch. Further, the generator starts to adjust the speed, the engine torque demand can be obtained, and the main oil circuit pressure P2 (target pressure) required for clutch engagement and the second working speed n2 (second speed) of the electronic oil pump can be calculated. At this time, it can be determined whether the clutch engagement condition is met by the master and slave end speeds of the clutch. If not, the steps of calculating P2 and n2 are continued. If it is met, the controller can perform closed-loop control of the electronic oil pump speed according to the detected main oil circuit pressure until the clutch engagement is completed and the preset engagement requirements are met.

[0135] It should be noted that the embodiments of the present invention can be applied to any vehicle, including vehicles using a dedicated hybrid transmission (DHT), and of course vehicles using other transmissions, which are not limited by the embodiments of the present invention. As a key component in the power system, DHT can optimize and match different power modes such as pure electric, series, parallel, and engine direct drive according to different driving conditions, and can achieve the optimal match between energy saving and strong power output.

[0136] In the embodiment of the present invention, it is not necessary to use multiple pressure regulating solenoid valves and pressure control valves. Instead, a hydraulic clutch control system including a target valve and an electronic oil pump is used. The oil in the oil pool is input into the control oil circuit through the electronic oil pump, which can increase the pressure of the control oil circuit and realize the clutch engagement operation. At the same time, the embodiment of the present invention adopts a target valve including a throttling state and a leakage state. When the clutch is engaged, the pressure balance of the control oil circuit can be maintained by placing the target valve in a throttling state. Correspondingly, when the clutch is disengaged, the control oil circuit can be quickly depressurized by placing the target valve in a leakage state. In the embodiment of the present invention, it is not necessary to use multiple pressure regulating solenoid valves and pressure control valves. The oil pressure of the control oil circuit can be controlled by an electronic oil pump and a target valve, thereby realizing the engagement and separation control of the clutch, simplifying the structure of the control system and reducing the cost.

[0137] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below.

[0138] The embodiment of the present invention further provides an electronic device, such as Figure 8As shown, it includes a processor 501 , a communication interface 502 , a memory 503 and a communication bus 504 , wherein the processor 501 , the communication interface 502 , and the memory 503 communicate with each other via the communication bus 504 .

[0139] The memory 503 is used to store computer programs.

[0140] When the processor 501 is used to execute the program stored in the memory 503, the following steps are implemented: in response to a clutch engagement request, the working state of the target valve in the clutch control system is switched to a throttling state; the speed of the electronic oil pump in the clutch control system is set to a first speed; when it is determined that the clutch in the clutch control system meets the engagement conditions, the speed of the electronic oil pump is set to a second speed, and the electronic oil pump is controlled to increase the speed until the clutch meets the preset engagement requirements.

[0141] The processor 501 may further implement the following steps:

[0142] Optionally, before setting the rotation speed of the electronic oil pump in the clutch control system to the first rotation speed, the method further includes:

[0143] acquiring a pre-engagement pressure of a control oil circuit in the clutch control system;

[0144] A first speed is determined based on the pre-engagement pressure.

[0145] Optionally, before setting the rotation speed of the electronic oil pump in the clutch control system to the first rotation speed, the method further includes:

[0146] Obtaining target torque of the engine;

[0147] determining a target pressure of a control oil circuit in the clutch control system based on the target torque;

[0148] A second rotation speed is determined based on the target pressure.

[0149] Optionally, the method further comprises:

[0150] Obtaining the driving end speed and the driven end speed of the clutch;

[0151] When the speed difference between the driving end speed and the driven end speed is not greater than a preset difference threshold, it is determined that the clutch meets the engagement condition.

[0152] Optionally, the method further comprises:

[0153] Acquiring a current pressure of a control oil circuit in the clutch control system;

[0154] When the current pressure falls within a preset pressure range, it is determined that the clutch meets a preset engagement requirement.

[0155] The clutch control system, clutch control method and vehicle provided by the embodiment of the present invention do not need to use multiple pressure regulating solenoid valves and pressure control valves, but use a hydraulic clutch control system including a target valve and an electronic oil pump. The oil in the oil pool is input into the control oil circuit by the electronic oil pump, which can increase the pressure of the control oil circuit and realize the clutch engagement operation. At the same time, the embodiment of the present invention adopts a target valve including a throttling state and a leakage state. When the clutch is engaged, the pressure balance of the control oil circuit can be maintained by placing the target valve in a throttling state. Correspondingly, when the clutch is disengaged, the control oil circuit can be quickly depressurized by placing the target valve in a leakage state. The embodiment of the present invention does not need to use multiple pressure regulating solenoid valves and pressure control valves. The oil pressure of the control oil circuit can be controlled by an electronic oil pump and a target valve, thereby realizing the engagement and separation control of the clutch, simplifying the structure of the control system and reducing costs.

[0156] The communication bus mentioned in the above electronic device can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The communication bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0157] The communication interface is used for communication between the above electronic device and other devices.

[0158] The memory may include a random access memory (RAM) or a non-volatile memory, such as at least one disk memory. Optionally, the memory may also be at least one storage device located away from the aforementioned processor.

[0159] The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0160] In another embodiment provided by the present invention, a computer-readable storage medium is provided, in which instructions are stored. When the computer-readable storage medium is run on a computer, the computer executes the clutch control method described in the above embodiment.

[0161] In another embodiment of the present invention, a computer program product including instructions is provided. When the computer program product is run on a computer, the computer executes the clutch control method described in the above embodiment.

[0162] In another embodiment of the present invention, a vehicle is provided. The vehicle includes the clutch control system described in the above embodiment.

[0163] The electronic device may also implement other steps in the above clutch control method, which will not be described in detail here.

[0164] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present invention is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state hard disk Solid State Disk (SSD)), etc.

[0165] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0166] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. For the embodiments of the device, electronic device, computer-readable storage medium and computer program products containing instructions, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0167] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A clutch control system, characterized in that: The system includes an oil pool, an electronic oil pump, a target valve, a control oil circuit and a clutch; The control oil circuit is connected to the oil pool and the clutch; The electronic oil pump is connected to the oil pool and the control oil circuit, and the electronic oil pump is used to drive the oil in the oil pool to be transported to the control oil circuit; The target valve is connected to the control oil circuit and the oil pool; When the clutch is engaged, the target valve is placed in a throttling state, and when the clutch is disengaged, the target valve is placed in a leaking state.

2. The system according to claim 1, characterized in that The control oil circuit includes a pressure sensor; The pressure sensor is used to detect the pressure of the control oil circuit.

3. The system according to claim 2, characterized in that The system also includes a controller; The controller is connected to the pressure sensor, the electronic oil pump and the target valve; The controller is used to control the rotation speed of the electronic oil pump; The controller is used to control the working state of the target valve.

4. The system according to claim 1, characterized in that The system also includes a suction filter; The suction filter is connected to the oil pool and the control oil circuit; The suction filter is used for filtering oil.

5. The system according to claim 1, characterized in that The control oil circuit includes an accumulator.

6. A clutch control method, characterized in that: The method is applied to the clutch control system according to any one of claims 1 to 5, and the method comprises: In response to a clutch engagement request, switching an operating state of a target valve in the clutch control system to a throttling state; Setting the rotation speed of the electronic oil pump in the clutch control system to a first rotation speed; When it is determined that the clutch in the clutch control system meets the engagement condition, the rotation speed of the electronic oil pump is set to a second rotation speed, and the electronic oil pump is controlled to increase the speed until the clutch meets the preset engagement requirement.

7. The method according to claim 6, characterized in that Before setting the rotation speed of the electronic oil pump in the clutch control system to the first rotation speed, the method further includes: acquiring a pre-engagement pressure of a control oil circuit in the clutch control system; A first speed is determined based on the pre-engagement pressure.

8. The method according to claim 6, characterized in that Before setting the rotation speed of the electronic oil pump in the clutch control system to the first rotation speed, the method further includes: Obtaining target torque of the engine; determining a target pressure of a control oil circuit in the clutch control system based on the target torque; A second rotation speed is determined based on the target pressure.

9. The method according to any one of claims 6 to 8, characterized in that: The method further comprises: Obtaining the driving end speed and the driven end speed of the clutch; When the speed difference between the driving end speed and the driven end speed is not greater than a preset difference threshold, it is determined that the clutch meets the engagement condition.

10. The method according to any one of claims 6 to 8, characterized in that: The method further comprises: Acquiring a current pressure of a control oil circuit in the clutch control system; When the current pressure falls within a preset pressure range, it is determined that the clutch meets a preset engagement requirement.

11. A vehicle, characterized in that: Includes the clutch control system described in any one of claims 1-5.

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