Cooling method and system based on hybrid power electric drive and hybrid power automobile

Abstract

The invention provides a cooling method and system based on hybrid power electric drive and a hybrid power automobile, and relates to the technical field of hybrid power automobiles. The method comprises the following steps: determining a first required supply flow of an electronic pump for cooling lubricating oil according to collected running state parameters of a driving motor; according to the collected operation state parameters of the generator, determining a second demand supply flow of the mechanical pump to the cooling lubricating oil and a second actual supply flow of the cooling lubricating oil provided by the mechanical pump; and under the condition that the second actual supply flow is larger than the second demand supply flow, the second electromagnetic valve is opened according to the valve opening degree associated with the second demand supply flow. The first compensation electromagnetic valve is opened according to the valve opening degree related to the difference value flow of the second actual supply flow and the second demand supply flow, redundant cooling lubricating oil pumped out by the mechanical pump flows into the first cooling loop through the first compensation electromagnetic valve, the cooling lubricating oil pumped out by the electronic pump can be reduced, and waste of the cooling lubricating oil cannot be caused.

Description

Technical Field

[0001] The present application relates to the technical field of hybrid vehicles, and in particular to a cooling method and system based on hybrid electric drive and a hybrid vehicle. Background Art

[0002] Hybrid vehicles are increasingly using transmission oil for lubrication of their drive motors, generators, and associated components. Hybrid vehicles are increasingly demanding greater power, and this increased power demands greater cooling and lubrication requirements. A single oil pump is no longer sufficient, requiring the use of an electronic pump combined with a mechanical pump to meet these system requirements.

[0003] Currently, the mechanical pump in hybrid vehicles is rigidly connected to the drive mechanism that provides the vehicle's kinetic energy. The pump's speed is determined by the operating power of the drive mechanism and cannot be adjusted. Therefore, to ensure optimal cooling and lubrication of the drive motor, generator, and associated components under various operating conditions, the mechanical pump typically delivers a higher flow rate of cooling lubricant than required, resulting in wasted cooling lubricant. Summary of the Invention

[0004] The present application provides a cooling method, system and hybrid vehicle based on hybrid electric drive, which are used to solve the problem in the prior art that the flow rate of cooling lubricating oil pumped out by a mechanical pump under most working conditions is higher than the actual required flow rate, resulting in waste of cooling lubricating oil.

[0005] In a first aspect, the present application provides a hybrid electric drive-based cooling method, which is applied to a hybrid electric drive-based cooling system for a vehicle. The system provided in the present application includes a main controller, a first cooling circuit, a second cooling circuit, and a first compensation solenoid valve. The first cooling circuit includes an electronic pump, a stator and rotor of a drive motor, and an oil return channel connected in sequence. The second cooling circuit includes a mechanical pump, a second solenoid valve, a stator and rotor of a generator, and an oil return channel connected in sequence. The mechanical pump is driven by the generator's rotating shaft.

[0006] The input end of the first compensation solenoid valve is connected between the mechanical pump and the stator and rotor of the generator, and the output end of the first compensation solenoid valve is connected between the electronic pump and the stator and rotor of the drive motor. The drive motor is provided with a first operating state parameter acquisition module, and the generator is provided with a second operating state parameter acquisition module. The main controller is electrically connected to the first compensation solenoid valve, the second solenoid valve, the first operating state parameter acquisition module, and the second operating state parameter acquisition module respectively. The method provided by the present application includes:

[0007] The main controller determines a first required supply flow rate of the cooling lubricating oil of the electronic pump according to the operating state parameters of the drive motor collected by the first operating state parameter collection module;

[0008] The main controller determines a second required supply flow rate of the cooling lubricating oil by the mechanical pump and a second actual supply flow rate of the cooling lubricating oil provided by the mechanical pump according to the operating state parameters of the generator collected by the second operating state parameter collection module;

[0009] When the second actual supply flow rate is greater than the second demand supply flow rate, the main controller opens the second solenoid valve according to the valve opening associated with the second demand supply flow rate;

[0010] The main controller opens the first compensation solenoid valve according to the valve opening associated with the difference between the second actual supply flow and the second required supply flow;

[0011] The main controller determines the operating power of the electronic pump according to the first demand supply flow rate and the difference between the second actual supply flow rate and the second demand supply flow rate, and controls the operation of the electronic pump according to the operating power.

[0012] In some embodiments, the system provided herein further includes a first power transmission assembly for transmitting power to the drive motor. The electronic pump, the first power transmission assembly, and the oil return channel are sequentially connected to form a first lubrication circuit. The main controller determines a first required supply flow rate of cooling lubricating oil from the electronic pump based on the operating state parameters of the drive motor collected by the first operating state parameter collection module, including:

[0013] The main controller determines a first sub-required flow rate of the cooling lubricating oil of the stator and rotor of the drive motor and a second sub-required flow rate of the cooling lubricating oil of the first power transmission component based on the operating state parameters of the drive motor collected by the first operating state parameter collection module;

[0014] The main controller determines a first required supply flow rate of the cooling lubricating oil by the electronic pump according to the sum of the first sub-required flow rate and the second sub-required flow rate.

[0015] In some embodiments, the operating state parameters of the drive motor include the speed and torque of the drive motor. The main controller determines the second sub-required flow rate of the cooling lubricating oil of the first power transmission component based on the operating state parameters of the drive motor collected by the first operating state parameter collection module, including:

[0016] determining the load of the drive motor from a preset relationship table according to the speed and torque of the drive motor collected by the first operating state parameter collection module;

[0017] A second sub-required flow rate of the cooling lubricating oil of the first power transmission component is determined according to the load of the drive motor.

[0018] In some embodiments, the system provided herein further includes a second power transmission assembly for transmitting power to the generator, the mechanical pump, the second power transmission assembly, and the oil return channel are sequentially connected to form a second lubrication circuit, and the main controller determines a second required supply flow rate of cooling lubricating oil by the mechanical pump based on the operating state parameters of the generator collected by the second operating state parameter collection module, including:

[0019] The main controller determines a third sub-required flow rate of the stator and rotor of the generator for cooling lubricating oil and a fourth sub-required flow rate of the second power transmission component for cooling lubricating oil based on the operating state parameters of the generator collected by the second operating state parameter collection module;

[0020] The main controller determines a second required supply flow rate of the cooling lubricating oil by the mechanical pump according to the sum of the third sub-required flow rate and the fourth sub-required flow rate.

[0021] In some embodiments, the operating state parameters of the generator include the speed and torque of the generator. The main controller determines the fourth sub-required flow rate of the cooling lubricating oil of the second power transmission assembly based on the operating state parameters of the generator collected by the second operating state parameter collection module, including:

[0022] Determining the load of the generator from a preset relationship table based on the speed and torque of the generator collected by the second operating state parameter collection module;

[0023] A fourth sub-required flow rate of the cooling lubricating oil of the second power transmission component is determined according to the load of the generator.

[0024] In some embodiments, a first solenoid valve is further connected between the electronic pump and the stator and rotor of the drive motor. The system further includes a second compensation solenoid valve, wherein an input end of the second compensation solenoid valve is connected between the electronic pump and the stator and rotor of the drive motor, and an output end of the second compensation solenoid valve is connected between the mechanical pump and the stator and rotor of the generator. After determining a second required supply flow rate of cooling lubricating oil by the mechanical pump and a second actual supply flow rate of cooling lubricating oil provided by the mechanical pump, the method provided by the present application further includes:

[0025] When the second actual supply flow rate is less than the second required supply flow rate, the main controller determines a flow rate difference between the second actual supply flow rate and the second required supply flow rate;

[0026] The main controller determines a first actual supply flow rate of the cooling lubricating oil by the electronic pump by summing the first demand supply flow rate and the difference flow rate;

[0027] The main controller controls the operation of the electronic pump according to the operating power associated with the first actual supply flow rate;

[0028] The first solenoid valve is opened according to the valve opening associated with the second demand supply flow, and the second compensation solenoid valve is opened according to the valve opening associated with the differential flow.

[0029] In some embodiments, an oil temperature sensor electrically connected to the main controller is further provided in the oil return channel. When the second actual supply flow rate is greater than the second required supply flow rate, the main controller opens the second solenoid valve according to the valve opening associated with the second required supply flow rate, including:

[0030] When the temperature of the cooling lubricating oil collected by the oil temperature sensor is lower than a set threshold or an abnormality of the electronic pump is detected, the main controller opens the second solenoid valve according to the valve opening associated with the second demand supply flow.

[0031] In some embodiments, a second one-way valve is provided between the mechanical pump and the second solenoid valve, the input end of the second one-way valve is connected to the mechanical pump, the output end of the second one-way valve is connected to the second solenoid valve, a pressure relief pipe connecting the oil pressure sensor and the oil return channel is provided between the output end of the second one-way valve and the second solenoid valve, the pressure relief pipe is provided with a pressure relief solenoid valve, and the oil pressure sensor and the pressure relief solenoid valve are respectively electrically connected to the main controller;

[0032] When the actual oil pressure collected by the oil pressure sensor is higher than the set oil pressure threshold, the main controller controls the pressure relief solenoid valve to open according to the valve opening associated with the difference between the actual oil pressure and the set oil pressure threshold.

[0033] In some embodiments, a first one-way valve is provided between the electronic pump and the first solenoid valve, the input end of the first one-way valve is connected to the electronic pump, and the output end of the first one-way valve is connected to the stator and rotor of the drive motor.

[0034] In some embodiments, the main controller determines a first required supply flow rate of the cooling lubricating oil by the electronic pump based on the operating state parameters of the drive motor collected by the first operating state parameter collection module, including:

[0035] The main controller searches for the heat loss of the drive motor from a preset relationship table according to the speed and torque of the drive motor collected by the first operating state parameter collection module;

[0036] The main controller determines a first required supply flow rate of the cooling lubricating oil by the electronic pump according to the heat loss of the driving motor and the temperature of the driving motor collected by the first operating state parameter collection module.

[0037] In some embodiments, the main controller determines the second required supply flow rate of the cooling lubricating oil by the mechanical pump based on the operating state parameters of the generator collected by the second operating state parameter collection module, including:

[0038] The main controller searches for the heat loss of the generator from a preset relationship table according to the speed and torque of the generator collected by the second operating state parameter collection module;

[0039] The main controller determines a second required supply flow rate of the cooling lubricating oil by the mechanical pump according to the heat loss of the generator and the temperature of the generator collected by the second operating state parameter collection module.

[0040] In a second aspect, the present application further provides a cooling system based on a hybrid electric drive, comprising a main controller, a first cooling circuit, a second cooling circuit, and a first compensation solenoid valve, wherein the first cooling circuit comprises an electronic pump, a stator and rotor of a drive motor, and an oil return channel connected in sequence, and the second cooling circuit comprises a mechanical pump, a second solenoid valve, a stator and rotor of a generator, and an oil return channel connected in sequence, wherein the mechanical pump is driven by a rotating shaft of the generator;

[0041] The input end of the first compensation solenoid valve is connected between the mechanical pump and the stator and rotor of the generator, and the output end of the first compensation solenoid valve is connected between the electronic pump and the stator and rotor of the drive motor. The drive motor is provided with a first operating status parameter acquisition module, and the generator is provided with a second operating status parameter acquisition module. The main controller is electrically connected to the first compensation solenoid valve, the second solenoid valve, the first operating status parameter acquisition module, and the second operating status parameter acquisition module, respectively. The main controller is used to execute the method provided in the first aspect of this application.

[0042] In a third aspect, the present application provides a hybrid vehicle, including the hybrid electric drive-based cooling system provided in the first aspect of the present application.

[0043] In a fourth aspect, the present application further provides a storage medium storing a computer program. When the computer program is executed by a processor, the computer executes the method provided in the first aspect of the present application.

[0044] In a fifth aspect, the present application also provides a computer program product, including a computer program, which, when executed, enables a hybrid vehicle to execute the method provided in the first aspect of the present application.

[0045] The present application provides a hybrid electric drive-based cooling method, system, and hybrid vehicle. The method can determine a first demand supply flow rate of cooling lubricant oil by an electronic pump based on the operating state parameters of a drive motor collected by a first operating state parameter collection module; determine a second demand supply flow rate of cooling lubricant oil by a mechanical pump and a second actual supply flow rate of cooling lubricant oil provided by the mechanical pump based on the operating state parameters of the generator collected by a second operating state parameter collection module; if the second actual supply flow rate is greater than the second demand supply flow rate, it indicates that under the current operating conditions, the actual flow rate of cooling lubricant oil provided by the mechanical pump is higher than the actual demand flow rate. Therefore, the second solenoid valve is opened based on the valve opening associated with the second demand supply flow rate. This ensures that the cooling lubricant oil provided to the stator and rotor of the generator is not wasted. The valve opening associated with the difference between the second actual supply flow rate and the second demand supply flow rate opens a first compensation solenoid valve. When the first compensation solenoid valve is opened, excess cooling lubricant oil pumped out by the mechanical pump can flow into the first cooling circuit through the first compensation solenoid valve. In this way, the operating power of the electronic pump can be determined based on the first demand supply flow and the difference between the second actual supply flow and the second demand supply flow, and the operation of the electronic pump can be controlled according to the operating power, which can reduce the cooling lubricating oil pumped out by the electronic pump and avoid wasting the cooling lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0047] Figure 1 A schematic structural diagram of a hybrid electric drive-based cooling system provided in an embodiment of the present application;

[0048] Figure 2 One of the flow charts of the cooling method based on hybrid electric drive provided in an embodiment of the present application;

[0049] Figure 3 A schematic diagram of the distribution of a second actual supply flow rate and a second required supply flow rate provided in an embodiment of the present application when the size of the mechanical pump is large;

[0050] Figure 4 One of the flow charts of the cooling method based on hybrid electric drive provided in an embodiment of the present application;

[0051] Figure 5A schematic diagram of the distribution of the second actual supply flow rate and the second required supply flow rate provided in an embodiment of the present application when the size of the mechanical pump is small. DETAILED DESCRIPTION

[0052] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0053] The accompanying drawings illustrate various schematic diagrams of structures according to embodiments of the present disclosure. These figures are not drawn to scale, and for the purpose of clarity, certain details are exaggerated and certain details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0054] In the context of the present disclosure, when a layer / element is referred to as being "on" another layer / element, it can be directly on the other layer / element or an intervening layer / element may be present therebetween. In addition, if a layer / element is "on" another layer / element in one orientation, it may be "below" the other layer / element when the orientation is reversed.

[0055] The following describes in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0056] The embodiment of the present application provides a cooling method based on hybrid electric drive, which is applied to a cooling system based on hybrid electric drive of a vehicle. Figure 1 As shown, the system provided in the embodiment of the present application includes a main controller (not shown in the drawings), a first cooling circuit, a second cooling circuit, and a first compensation solenoid valve 110. The first cooling circuit includes an electronic pump 102, a stator and rotor 106 of a drive motor, and an oil return channel connected in sequence. The second cooling circuit includes a mechanical pump 101, a second solenoid valve 103, a stator and rotor 107 of a generator, and an oil return channel connected in sequence, and the mechanical pump 101 is driven by the rotating shaft of the generator.

[0057] The input of the first compensation solenoid valve 110 is connected between the mechanical pump 101 and the stator and rotor 107 of the generator. The output of the first compensation solenoid valve 110 is connected between the electronic pump 102 and the stator and rotor 106 of the drive motor. The drive motor is equipped with a first operating state parameter acquisition module, and the generator is equipped with a second operating state parameter acquisition module. The main controller is electrically connected to the first compensation solenoid valve 110, the second solenoid valve 103, the first operating state parameter acquisition module, and the second operating state parameter acquisition module, respectively.

[0058] It should be noted that, Figure 1 As shown, the system provided by the embodiment of the present application also includes a water circulation loop, which includes a water pump, a vehicle radiator, a first heat exchanger and a second heat exchanger connected in sequence, wherein the vehicle radiator is used to cool the water pumped out by the water pump, the first heat exchanger is used to heat exchange the high-temperature cooling lubricating oil in the first cooling loop with the cooled water; the second heat exchanger is used to heat exchange the high-temperature cooling lubricating oil in the second cooling loop with the cooled water. Figure 2 As shown, the method provided in the embodiment of the present application includes S201-S205, wherein:

[0059] S201: The main controller determines a first required supply flow rate of the cooling lubricating oil by the electronic pump 102 according to the operating state parameters of the drive motor collected by the first operating state parameter collection module.

[0060] Specifically, the main controller searches a preset relationship table for the heat loss of the drive motor based on the speed and torque of the drive motor collected by the first operating state parameter collection module. The main controller determines a first required supply flow rate of the cooling lubricant oil by electronic pump 102 based on the heat loss of the drive motor and the temperature of the drive motor collected by the first operating state parameter collection module.

[0061] For example, the first operating state parameter acquisition module includes a first speed sensor for acquiring the speed of the drive motor, a first torque sensor for acquiring the torque of the drive motor, and a first temperature sensor for acquiring the drive motor. Exemplarily, the main controller can input the heat loss of the drive motor and the acquired temperature of the drive motor into a pre-trained first demand supply flow determination model to determine the first demand supply flow of the cooling lubricant oil by the electronic pump 102. The first demand supply flow determination model is obtained by training a plurality of first training samples input into a first neural network, each first training sample including the historical heat loss and temperature of the historical drive motor and the corresponding historical supply flow of the cooling lubricant oil that can keep the temperature of the stator and rotor 106 of the drive motor at a cooling temperature (e.g., 60 degrees Celsius to 80 degrees Celsius).

[0062] It should be noted that, Figure 1As shown, the system provided in the present application also includes a first power transmission component 108 for transmitting power to the drive motor, and the electronic pump 102, the first power transmission component 108 (bearings, gears, splines and other components connected to the drive motor) and the return oil channel are connected in sequence to form a first lubrication circuit.

[0063] The main controller determines a first sub-required flow rate of cooling lubricant oil for the stator and rotor 106 of the drive motor and a second sub-required flow rate of cooling lubricant oil for the first power transmission assembly 108 based on the operating state parameters of the drive motor collected by the first operating state parameter collection module. Exemplarily, the operating state parameters of the drive motor include the speed and torque of the drive motor. The load of the drive motor can be determined from a preset relationship table based on the speed and torque of the drive motor collected by the first operating state parameter collection module. The second sub-required flow rate of cooling lubricant oil for the first power transmission assembly 108 is determined based on the load of the drive motor. Furthermore, the main controller determines the first required supply flow rate of cooling lubricant oil for the electronic pump 102 based on the sum of the first and second sub-required flow rates.

[0064] S202 : The main controller determines a second required supply flow rate of the cooling lubricating oil by the mechanical pump 101 and a second actual supply flow rate of the cooling lubricating oil provided by the mechanical pump 101 according to the operating state parameters of the generator collected by the second operating state parameter collection module.

[0065] For example, the main controller searches a preset relationship table for the generator's heat loss based on the generator's speed and torque collected by the second operating parameter collection module. The main controller determines a second required supply flow rate of cooling lubricating oil from mechanical pump 101 based on the generator's heat loss and the generator's temperature collected by the second operating parameter collection module.

[0066] For example, the second operating state parameter acquisition module includes a second speed sensor for acquiring the speed of the generator, a second torque sensor for acquiring the torque of the generator, and a second temperature sensor for acquiring the generator. Exemplarily, the main controller can input the heat loss of the generator and the acquired temperature of the generator into a pre-trained second demand supply flow determination model to determine the second demand supply flow of the cooling lubricating oil by the mechanical pump 101. The second demand supply flow determination model is obtained by training a plurality of second training samples input into the second neural network, each second training sample including the historical heat loss and temperature of the historical generator and the corresponding historical supply flow of the cooling lubricating oil that can keep the temperature of the stator and rotor 107 of the generator at a cooling temperature (e.g., 60 degrees Celsius to 80 degrees Celsius).

[0067] Still Figure 1As shown, the system provided in the present application also includes a second power transmission component 109 for transmitting power to the generator, and the mechanical pump 101, the second power transmission component 109 (bearings, gears, splines and other components connected to the generator) and the return oil channel are connected in sequence to form a second lubrication circuit.

[0068] Based on the generator's operating parameters collected by the second operating parameter acquisition module, the main controller determines a third sub-required flow rate for the cooling lubricant oil in the generator's stator and rotor 107 and a fourth sub-required flow rate for the cooling lubricant oil in the second power transmission assembly 109. For example, the generator's operating parameters include the generator's speed and torque. Based on the speed and torque collected by the second operating parameter acquisition module, the generator's load can be determined from a preset relationship table. The fourth sub-required flow rate for the cooling lubricant oil in the second power transmission assembly 109 is determined based on the generator's load. Furthermore, the main controller determines the second required supply flow rate for the cooling lubricant oil in the mechanical pump 101 based on the sum of the third and fourth sub-required flow rates.

[0069] In addition, the second actual supply flow rate of the cooling lubricating oil provided by the mechanical pump 101 is determined not only by the generator's operating parameters (such as the generator's speed and torque), but also by the size of the mechanical pump 101. The generator's operating parameters and the size of the mechanical pump can be input into a pre-trained actual supply flow rate determination model to determine the second actual supply flow rate of the cooling lubricating oil provided by the mechanical pump 101. The actual supply flow rate determination model is determined based on the generator's historical operating parameters, historical mechanical pump sizes, and corresponding historical actual supply flows. It should be noted that the size of the mechanical pump is positively correlated with the second actual supply flow rate of the cooling lubricating oil provided by the mechanical pump 101.

[0070] S203 : When the second actual supply flow rate is greater than the second required supply flow rate, the main controller opens the second solenoid valve 103 according to the valve opening associated with the second required supply flow rate.

[0071] It should be noted that when the mechanical pump is large, under most operating conditions, the second actual supply flow rate is greater than the second required supply flow rate. When the second actual supply flow rate is greater than the second required supply flow rate, it indicates that under the current operating conditions, the actual flow rate of cooling lubricating oil provided by the mechanical pump 101 is higher than the required flow rate. Therefore, the second solenoid valve 103 is opened according to the valve opening associated with the second required supply flow rate. This ensures that the cooling lubricating oil provided to the stator and rotor 107 of the generator is not wasted.

[0072] S204 : The main controller opens the first compensation solenoid valve 110 according to the valve opening associated with the difference between the second actual supply flow and the second required supply flow.

[0073] When the first compensation solenoid valve 110 is opened, the excess cooling lubricating oil pumped out by the mechanical pump 101 can flow into the first cooling circuit through the first compensation solenoid valve 110 .

[0074] S205: The main controller determines the operating power of the electronic pump 102 according to the first demand supply flow rate and the difference between the second actual supply flow rate and the second demand supply flow rate, and controls the operation of the electronic pump 102 according to the operating power.

[0075] In summary, the embodiments of the present application provide a cooling method based on a hybrid electric drive. The method can determine a first demanded supply flow rate of cooling lubricant oil by the electronic pump 102 based on the operating state parameters of the drive motor collected by a first operating state parameter collection module. The method can also determine a second demanded supply flow rate of cooling lubricant oil by the mechanical pump 101 and a second actual supply flow rate of cooling lubricant oil provided by the mechanical pump 101 based on the operating state parameters of the generator collected by a second operating state parameter collection module. If the second actual supply flow rate is greater than the second demanded supply flow rate, indicating that the actual flow rate of cooling lubricant oil provided by the mechanical pump 101 is higher than the actual demanded flow rate under the current operating conditions, the second solenoid valve 103 is opened based on the valve opening associated with the second demanded supply flow rate. This ensures that the cooling lubricant oil provided to the stator and rotor 107 of the generator is not wasted. The valve opening associated with the difference between the second actual supply flow rate and the second demanded supply flow rate opens the first compensation solenoid valve 110. When the first compensation solenoid valve 110 is opened, excess cooling lubricant oil pumped by the mechanical pump 101 can flow into the first cooling circuit through the first compensation solenoid valve 110. In this way, the operating power of the electronic pump 102 can be determined based on the first demand supply flow and the difference flow between the second actual supply flow and the second demand supply flow, and the operation of the electronic pump 102 can be controlled according to the operating power, which can reduce the cooling lubricating oil pumped out by the electronic pump 102 and avoid wasting the cooling lubricating oil.

[0076] After the inventor's test, Figure 3 As shown, when the generator power is higher, the difference between the second actual supply flow rate and the second required supply flow rate of the mechanical pump 101 is larger, and the saving effect on the cooling lubricating oil is more significant. Figure 3 As shown, when the generator power is greater than 50KW, the difference between the second actual supply flow and the second required supply flow of the mechanical pump 101 is large, and the effect of saving cooling lubricating oil is significant.

[0077] In addition, a first solenoid valve 105 is connected between the electronic pump 102 and the stator and rotor 106 of the drive motor. The system provided by the present application also includes a second compensation solenoid valve 111. The input end of the second compensation solenoid valve 111 is connected between the electronic pump 102 and the stator and rotor 106 of the drive motor, and the output end of the second compensation solenoid valve 111 is connected between the mechanical pump 101 and the stator and rotor 107 of the generator. After S202, as Figure 4 As shown, the method provided in the embodiment of the present application also includes:

[0078] S401: When the second actual supply flow rate is less than the second required supply flow rate, the main controller determines a flow rate difference between the second actual supply flow rate and the second required supply flow rate.

[0079] It should be noted that when the mechanical pump is small, under most operating conditions, the second actual supply flow rate is less than the second required supply flow rate. When the second actual supply flow rate is less than the second required supply flow rate, the main controller indicates that under the current operating conditions, the actual flow rate of cooling lubricant oil provided by mechanical pump 101 is lower than the actual required flow rate, requiring electronic pump 102 to cool the generator rotor and replenish cooling lubricant oil.

[0080] S402 : The main controller determines a first actual supply flow rate of the cooling lubricating oil by the electronic pump 102 by summing the first required supply flow rate and the difference flow rate.

[0081] S403: The main controller controls the operation of the electronic pump 102 according to the operating power associated with the first actual supply flow rate.

[0082] S404: Open the first solenoid valve 105 according to the valve opening associated with the second demand supply flow, and open the second compensation solenoid valve 111 according to the valve opening associated with the differential flow.

[0083] In this way, the electronic pump 102 can replenish the cooling lubricating oil of the difference between the second actual supply flow and the second required supply flow to the rotor of the generator through the second compensation solenoid valve 111, ensuring that the rotor of the generator is at a cooling temperature.

[0084] In addition, a first one-way valve is arranged between the electronic pump 102 and the first solenoid valve 105. The input end of the first one-way valve is connected to the electronic pump 102, and the output end of the first one-way valve is connected to the stator and rotor 106 of the drive motor, which can prevent the supplemented cooling lubricating oil from flowing back into the electronic pump 102.

[0085] After the inventor's test, Figure 5 As shown in FIG, when the generator power is lower than 50 kW, the second actual supply flow of the mechanical pump 101 is significantly lower than the difference between the second demand supply flow. Figure 5As shown, when the generator power is less than 50KW, the electronic pump 102 can be used to supplement the cooling lubricating oil to the rotor of the generator so that the rotor of the generator is at a cooling temperature.

[0086] In some embodiments, an oil temperature sensor electrically connected to the main controller is further provided in the oil return channel. When the temperature of the cooling lubricant oil detected by the oil temperature sensor is lower than a set threshold (e.g., -20°C) or when the electronic pump 102 is detected to be abnormal, the main controller indicates that the electronic pump 102 is no longer able to provide the required first demand supply flow to the stator and rotor 106 of the drive motor (when the temperature of the cooling lubricant oil is lower than the set threshold, the viscosity of the cooling lubricant oil increases sharply, and the electronic pump 102, due to its own performance limitations, is unable to pump out a large flow of cooling lubricant oil) and the first power transmission component 108. Therefore, the second solenoid valve 103 is opened according to the valve opening associated with the second demand supply flow. This allows the mechanical pump 101 to supply the difference between the second actual supply flow and the second demand supply flow to the stator and rotor 106 of the drive motor.

[0087] Furthermore, a second one-way valve (not shown in the drawings) is disposed between the mechanical pump 101 and the second solenoid valve 103. The input of the second one-way valve is connected to the mechanical pump 101, and the output of the second one-way valve is connected to the second solenoid valve 103. An oil pressure sensor and a pressure relief pipe connected to the oil return channel are disposed between the output of the second one-way valve and the second solenoid valve 103. The pressure relief pipe is provided with a pressure relief solenoid valve. The oil pressure sensor and the pressure relief solenoid valve are each electrically connected to the main controller. When the actual oil pressure detected by the oil pressure sensor is higher than a set oil pressure threshold, the main controller controls the opening of the pressure relief solenoid valve based on the valve opening associated with the difference between the actual oil pressure and the set oil pressure threshold, thereby draining excess cooling lubricating oil into the oil return channel and ensuring the normal operation of the second cooling circuit.

[0088] In addition, if Figure 1As shown, the embodiment of the present application also provides a cooling system based on hybrid electric drive, including a main controller, a first cooling circuit, a second cooling circuit, and a first compensation solenoid valve 110. The first cooling circuit includes an electronic pump 102, a stator and rotor 106 of a drive motor, and an oil return channel connected in sequence. The second cooling circuit includes a mechanical pump 101, a second solenoid valve 103, a stator and rotor 107 of a generator, and an oil return channel connected in sequence. The mechanical pump 101 is driven by the rotating shaft of the generator. The input end of the first compensation solenoid valve 110 is connected between the mechanical pump 101 and the stator and rotor 107 of the generator, and the output end of the first compensation solenoid valve 110 is connected between the electronic pump 102 and the stator and rotor 106 of the drive motor. The drive motor is provided with a first operating state parameter acquisition module, and the generator is provided with a second operating state parameter acquisition module. The main controller is electrically connected to the first compensation solenoid valve 110, the second solenoid valve 103, the first operating state parameter acquisition module, and the second operating state parameter acquisition module respectively. The main controller is used to execute the method provided in the above embodiment of the present application.

[0089] In addition, an embodiment of the present application further provides a hybrid vehicle, including the hybrid electric drive-based cooling system provided in the first aspect of the present application.

[0090] In addition, an embodiment of the present application further provides a storage medium, which stores a computer program. When the computer program is executed by a processor, the computer executes the method provided in the above embodiment of the present application.

[0091] In addition, an embodiment of the present application further provides a computer program product, including a computer program. When the computer program is executed, the hybrid vehicle executes the method provided in the above embodiment of the present application.

[0092] While the above description does not provide detailed technical details regarding the patterning of each layer, those skilled in the art will appreciate that various technical means can be employed to form layers, regions, and the like in desired shapes. Furthermore, those skilled in the art may devise methods that differ from those described above to achieve the same structure. Furthermore, while each embodiment has been described separately, this does not mean that the measures in each embodiment cannot be advantageously combined.

[0093] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0094] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A cooling method based on hybrid electric drive, characterized in that: A hybrid electric drive-based cooling system for a vehicle, the system comprising a main controller, a first cooling circuit, a second cooling circuit, and a first compensation solenoid valve. The first cooling circuit comprises an electronic pump, a stator and rotor of a drive motor, and an oil return passage, which are connected in sequence. The second cooling circuit comprises a mechanical pump, a second solenoid valve, a stator and rotor of a generator, and the oil return passage, which are connected in sequence. The mechanical pump is driven by a rotating shaft of the generator. The input end of the first compensation solenoid valve is connected between the mechanical pump and the stator and rotor of the generator, the output end of the first compensation solenoid valve is connected between the electronic pump and the stator and rotor of the drive motor, the drive motor is provided with a first operating state parameter acquisition module, the generator is provided with a second operating state parameter acquisition module, the main controller is electrically connected to the first compensation solenoid valve, the second solenoid valve, the first operating state parameter acquisition module, and the second operating state parameter acquisition module, respectively, and the method includes: The main controller determines a first required supply flow rate of the cooling lubricating oil by the electronic pump according to the operating state parameters of the drive motor collected by the first operating state parameter collection module; The main controller determines, based on the operating state parameters of the generator collected by the second operating state parameter collection module, a second required supply flow rate of the cooling lubricating oil by the mechanical pump and a second actual supply flow rate of the cooling lubricating oil provided by the mechanical pump; When the second actual supply flow rate is greater than the second demand supply flow rate, the main controller opens the second solenoid valve according to the valve opening associated with the second demand supply flow rate; The main controller opens the first compensation solenoid valve according to the valve opening associated with the difference between the second actual supply flow and the second demand supply flow; The main controller determines the operating power of the electronic pump according to the first demand supply flow rate and the difference between the second actual supply flow rate and the second demand supply flow rate, and controls the operation of the electronic pump according to the operating power.

2. The method according to claim 1, characterized in that The system further includes a first power transmission assembly for transmitting power to the drive motor, the electronic pump, the first power transmission assembly, and the oil return channel are sequentially connected to form a first lubrication circuit, and the main controller determines a first required supply flow rate of cooling lubricating oil by the electronic pump based on the operating state parameters of the drive motor collected by the first operating state parameter collection module, including: The main controller determines, based on the operating state parameters of the drive motor acquired by the first operating state parameter acquisition module, a first sub-required flow rate of the stator and rotor of the drive motor for cooling lubricating oil and a second sub-required flow rate of the cooling lubricating oil by the first power transmission component; The main controller determines a first required supply flow rate of the cooling lubricating oil by the electronic pump according to the sum of the first sub-required flow rate and the second sub-required flow rate.

3. The method according to claim 2, characterized in that The operating state parameters of the drive motor include the speed and torque of the drive motor. The main controller determines the second sub-required flow rate of the cooling lubricating oil of the first power transmission component according to the operating state parameters of the drive motor collected by the first operating state parameter collection module, including: determining the load of the drive motor from a preset relationship table according to the speed and torque of the drive motor collected by the first operating state parameter collection module; A second sub-required flow rate of the cooling lubricating oil by the first power transmission component is determined according to the load of the drive motor.

4. The method according to claim 1, wherein The system further includes a second power transmission assembly for transmitting power to the generator, the mechanical pump, the second power transmission assembly, and the oil return channel are sequentially connected to form a second lubrication circuit, and the main controller determines a second required supply flow rate of cooling lubricating oil by the mechanical pump based on the operating state parameters of the generator collected by the second operating state parameter collection module, including: The main controller determines, based on the operating state parameters of the generator collected by the second operating state parameter collection module, a third sub-required flow rate of the stator and rotor of the generator for cooling lubricating oil and a fourth sub-required flow rate of the cooling lubricating oil by the second power transmission assembly; The main controller determines a second required supply flow rate of the cooling lubricating oil by the mechanical pump according to the sum of the third sub-required flow rate and the fourth sub-required flow rate.

5. The method according to claim 4, characterized in that The operating state parameters of the generator include the speed and torque of the generator. The main controller determines, based on the operating state parameters of the generator collected by the second operating state parameter collection module, a fourth sub-required flow rate of the cooling lubricating oil by the second power transmission component, including: determining the load of the generator from a preset relationship table according to the rotation speed and torque of the generator collected by the second operating state parameter collection module; A fourth sub-required flow rate of the cooling lubricating oil by the second power transmission component is determined according to the load of the generator.

6. The method according to claim 1, characterized in that A first solenoid valve is further connected between the electronic pump and the stator and rotor of the drive motor. The system further includes a second compensation solenoid valve, wherein an input end of the second compensation solenoid valve is connected between the electronic pump and the stator and rotor of the drive motor, and an output end of the second compensation solenoid valve is connected between the mechanical pump and the stator and rotor of the generator. After determining a second required supply flow rate of cooling lubricating oil by the mechanical pump and a second actual supply flow rate of cooling lubricating oil provided by the mechanical pump, the method further includes: The main controller determines a flow rate difference between the second actual supply flow rate and the second demanded supply flow rate when the second actual supply flow rate is less than the second demanded supply flow rate; The main controller determines a first actual supply flow rate of the cooling lubricating oil by the electronic pump by summing the first demand supply flow rate and the difference flow rate; The main controller controls the operation of the electronic pump according to the operating power associated with the first actual supply flow rate; The first solenoid valve is opened according to the valve opening associated with the second demand supply flow, and the second compensation solenoid valve is opened according to the valve opening associated with the differential flow.

7. The method according to claim 1, characterized in that An oil temperature sensor electrically connected to the main controller is further provided in the oil return passage. When the second actual supply flow rate is greater than the second demand supply flow rate, the main controller opens the second solenoid valve according to the valve opening associated with the second demand supply flow rate, including: When the temperature of the cooling lubricating oil collected by the oil temperature sensor is lower than a set threshold or an abnormality is detected in the electronic pump, the main controller opens the second solenoid valve according to the valve opening associated with the second demand supply flow.

8. The method according to claim 1, characterized in that A second one-way valve is provided between the mechanical pump and the second solenoid valve, the input end of the second one-way valve is connected to the mechanical pump, the output end of the second one-way valve is connected to the second solenoid valve, a pressure relief pipe connecting an oil pressure sensor and the oil return channel is provided between the output end of the second one-way valve and the second solenoid valve, the pressure relief pipe is provided with a pressure relief solenoid valve, and the oil pressure sensor and the pressure relief solenoid valve are electrically connected to the main controller respectively; When the actual oil pressure collected by the oil pressure sensor is higher than a set oil pressure threshold, the main controller controls the pressure relief solenoid valve to open according to the valve opening associated with the difference between the actual oil pressure and the set oil pressure threshold.

9. The method according to claim 1, characterized in that A first one-way valve is provided between the electronic pump and the stator and rotor of the drive motor. The input end of the first one-way valve is connected to the electronic pump, and the output end of the first one-way valve is connected to the first solenoid valve.

10. The method according to any one of claims 1 to 9, characterized in that: The main controller determines a first required supply flow rate of the cooling lubricating oil by the electronic pump according to the operating state parameters of the drive motor collected by the first operating state parameter collection module, including: The main controller searches for the heat loss of the drive motor from a preset relationship table according to the speed and torque of the drive motor collected by the first operating state parameter collection module; The main controller determines a first required supply flow rate of the cooling lubricating oil by the electronic pump according to the heat loss of the drive motor and the temperature of the drive motor collected by the first operating state parameter collection module.

11. The method according to any one of claims 1 to 9, characterized in that: The main controller determines a second required supply flow rate of the cooling lubricating oil by the mechanical pump according to the operating state parameter of the generator collected by the second operating state parameter collection module, including: The main controller searches for the heat loss of the generator from a preset relationship table according to the speed and torque of the generator collected by the second operating state parameter collection module; The main controller determines a second required supply flow rate of the cooling lubricating oil by the mechanical pump according to the heat loss of the generator and the temperature of the generator collected by the second operating state parameter collection module.

12. A cooling system based on hybrid electric drive, characterized in that: The system includes a main controller, a first cooling circuit, a second cooling circuit, and a first compensation solenoid valve. The first cooling circuit includes an electronic pump, a stator and rotor of a drive motor, and an oil return channel connected in sequence. The second cooling circuit includes a mechanical pump, a second solenoid valve, a stator and rotor of a generator, and the oil return channel connected in sequence. The mechanical pump is driven by a rotating shaft of the generator. The input end of the first compensation solenoid valve is connected between the mechanical pump and the stator and rotor of the generator, the output end of the first compensation solenoid valve is connected between the electronic pump and the stator and rotor of the drive motor, the drive motor is provided with a first operating state parameter acquisition module, the generator is provided with a second operating state parameter acquisition module, the main controller is electrically connected to the first compensation solenoid valve, the second solenoid valve, the first operating state parameter acquisition module, and the second operating state parameter acquisition module respectively, and the main controller is used to execute any method described in claims 1-11.

13. A hybrid vehicle, characterized in that: Including the hybrid electric drive-based cooling system as described in claim 12.

14. A storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the computer is caused to perform the method according to any one of claims 1 to 11.

15. A computer program product comprising a computer program, characterized in that When the computer program is executed, the hybrid vehicle is caused to execute the method as claimed in any one of claims 1 to 11.

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