Oil quantity calibration method and device, storage medium, controller, system and vehicle

Abstract

The embodiment of the invention provides an oil quantity calibration method and device, a storage medium, a controller, a system and a vehicle, and the method comprises the steps: obtaining a first preset parameter set, the first preset parameter set comprises a first preset parameter pair corresponding to a first motor stator under a plurality of single motor working conditions, and the first preset parameter pair comprises torque and rotating speed; calculating a first required oil quantity based on the torque and the rotating speed of each first preset parameter pair; the first required oil quantity of each first preset parameter pair is used as a basic value, and a first target oil quantity of the first motor stator meeting the first temperature condition under the corresponding working condition is calibrated; calibrating a second target oil quantity when a second temperature condition is met under a working condition corresponding to a second motor stator load; the actual oil mass is adjusted to be consistent with the sum of the first target oil mass and the second target oil mass under the corresponding single-motor working condition, and the current total oil mass is calibrated as the target total oil mass; and the target total oil quantities under the multiple dual-motor working conditions are gathered, and an oil quantity control calibration table is formed.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicle control technology, and in particular to a fuel quantity calibration method and device, a storage medium, a controller, a system and a vehicle. Background Art

[0002] With the continuous development of hybrid technology, in hybrid transmissions, in order to increase the rated power of the motor, it is necessary to control the temperature of the motor. Among them, too high or too low a temperature may affect the performance of the motor. In order to control the temperature of the motor, an electronic oil pump is used to adjust and control the lubrication oil circuit.

[0003] When an electronic oil pump is used for oil circuit control, the calibration progress of the electronic oil pump control strategy is positively correlated with the performance of the motor. However, the calibration accuracy of some control strategies currently used is low, which may cause the motor temperature to be too high or too low during the control process, affecting the motor performance, and even causing the electronic oil pump power to be wasted, affecting the efficiency of the assembly (engine + hybrid box). Summary of the invention

[0004] The embodiments of the present application provide an oil quantity calibration method and device, a storage medium, a controller, a system and a vehicle. The oil quantity calibration method is used to calibrate the oil pump control strategy, thereby overcoming the problem of low calibration accuracy of the control strategy in the prior art, which may cause the motor temperature to be too high or too low during the control process, affecting the motor performance.

[0005] In a first aspect, an embodiment of the present application provides an oil quantity calibration method, comprising: obtaining a first preset parameter set, the first preset parameter set comprising a first preset parameter pair corresponding to a first motor stator under multiple single motor operating conditions, the first preset parameter pair comprising torque and speed; calculating a first required oil quantity based on the torque and speed of each first preset parameter pair; taking the first required oil quantity of each first preset parameter pair as a basic value, calibrating a first target oil quantity when the first motor stator meets a first temperature condition under the corresponding operating condition; obtaining a second preset parameter set, the first preset parameter set comprising a second preset parameter pair corresponding to a second motor stator under multiple single motor operating conditions. parameter pair, the second preset parameter pair includes torque and speed; the second required oil quantity is calculated based on the torque and speed of each second preset parameter pair; the second target oil quantity when the second motor stator meets the second temperature condition under the corresponding working condition is calibrated based on the second required oil quantity of each second preset parameter pair; the actual oil quantity corresponding to the first motor stator and the second motor stator under multiple dual-motor working conditions is obtained, and the actual oil quantity is adjusted to be consistent with the sum of the first target oil quantity and the second target oil quantity under the corresponding single-motor working condition, and the current total oil quantity is calibrated as the target total oil quantity; the target total oil quantities under multiple dual-motor working conditions are summarized to form an oil quantity control calibration table.

[0006] In one possible implementation, the first target oil quantity of the first motor stator when it meets the first temperature condition under the corresponding working condition is calibrated based on the first required oil quantity of each first preset parameter pair as the basic value, including: when the torque and speed in the first preset parameter pair correspond to the first power, the first target oil quantity of the first motor stator when it meets the first temperature range is calibrated based on the first required oil quantity of the first preset parameter pair; when the torque and speed in the first preset parameter pair correspond to the second power, the first target oil quantity of the first motor stator when it meets the second temperature range is calibrated based on the first required oil quantity of the first preset parameter pair; wherein, the first power is lower than the preset power, the second power is not lower than the preset power, and the second temperature range is higher than the first temperature range.

[0007] In one possible implementation, the second target oil quantity when the second motor stator meets the second temperature condition under the corresponding working condition is calibrated based on the second required oil quantity of each second preset parameter pair as the basic value, including: when the torque and speed in the second preset parameter pair correspond to the third power, the second target oil quantity when the second motor stator meets the third temperature range is calibrated based on the second required oil quantity of the second preset parameter pair; when the torque and speed in the second preset parameter pair correspond to the fourth power, the second target oil quantity when the stator of the second motor meets the fourth temperature range is calibrated based on the second required oil quantity of the second preset parameter pair; wherein the third power is lower than the preset power, the fourth power is not lower than the preset power, and the fourth temperature range is higher than the third temperature range.

[0008] In one possible implementation, after the current total oil quantity is calibrated as the target total oil quantity and before the target total oil quantities under multiple dual-motor operating conditions are summarized to form an oil quantity control calibration table, it also includes: determining whether the actual oil quantity of the current first motor stator is consistent with the first target oil quantity under the corresponding single-motor operating condition; if not, adjusting the actual oil quantity of the current first motor stator to be consistent with the first target oil quantity based on the target total oil quantity; determining whether the actual oil quantity of the current second motor stator is consistent with the second target oil quantity under the corresponding single-motor operating condition; if not, adjusting the actual oil quantity of the current second motor stator to be consistent with the second target oil quantity based on the target total oil quantity.

[0009] In one possible implementation, adjusting the current actual oil amount in the first motor stator to be consistent with the first target oil amount includes: adjusting the duty cycle of the first solenoid valve in the oil circuit of the first motor stator until the current actual oil amount in the first motor stator is consistent with the first target oil amount; adjusting the current actual oil amount in the second motor stator to be consistent with the second target oil amount includes: adjusting the duty cycle of the second solenoid valve in the oil circuit of the second motor stator until the current actual oil amount in the second motor stator is consistent with the second target oil amount.

[0010] In a second aspect, an embodiment of the present application provides an oil quantity calibration device, including a processor and a memory, wherein the memory is used to store at least one instruction, and when the instruction is loaded and executed by the processor, the oil quantity calibration method provided in the first aspect is implemented.

[0011] In a third aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the oil quantity calibration method provided in the first aspect is implemented.

[0012] In a fourth aspect, an embodiment of the present application further provides a motor controller, comprising the oil quantity calibration device provided in the second aspect.

[0013] In a fifth aspect, an embodiment of the present application further provides an oil pump control system, comprising an electronic oil pump for pumping lubricating oil to a lubricating oil circuit; a first solenoid valve, disposed in a first motor stator oil circuit, for controlling the amount of oil input into the first motor stator oil circuit by adjusting a duty cycle; a first flow meter, disposed between the first electronic valve and the first motor stator, for detecting the amount of oil input into the first motor stator oil circuit; a first temperature sensor, for detecting the temperature of the first motor stator;

[0014] A second solenoid valve is arranged on the second motor stator oil circuit, and is used to control the amount of oil input into the second motor stator oil circuit by adjusting the duty cycle; a second flow meter is arranged between the second electronic valve and the second motor stator, and is used to detect the amount of oil input into the second motor stator oil circuit; a second temperature sensor is used to detect the temperature of the second motor stator; a motor controller is respectively connected to the electronic oil pump, the first solenoid valve, the first flow meter, the first temperature sensor, the second solenoid valve, the second flow meter and the second temperature sensor; and is used to control the electronic oil pump to output a target total oil volume according to the oil volume control calibration table based on the current motor working condition, control the first electronic valve to output a first target oil volume to the first motor stator oil circuit through a target duty cycle, and control the second electronic valve to output a second target oil volume to the second motor stator oil circuit through a target duty cycle.

[0015] Through the above technical solution, the oil quantity control calibration is performed on the first motor and the second motor in the hybrid box respectively. The single motor calibration is performed first to reduce the mutual influence of the dual motor calibration process. Then, based on the data under the single motor calibration, further calibration is performed under the dual motor working condition to obtain the target total oil quantity under each working condition, and the oil quantity control calibration table is formed by summarizing the target total oil quantity. During the actual operation of the vehicle, the electronic oil pump can be finely controlled through the oil quantity control calibration table to keep the motor temperature within the preset temperature range, thereby improving the motor performance and the assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 A schematic diagram of a lubricating oil circuit structure provided for one embodiment of the present application;

[0018] Figure 2 A schematic diagram of a flow chart of an oil quantity calibration method provided in one embodiment of the present application;

[0019] Figure 3 A schematic diagram of a calibration process under a first power condition provided in an embodiment of the present application;

[0020] Figure 4 A schematic diagram of a calibration process under a second power condition provided in an embodiment of the present application;

[0021] Figure 5 A schematic diagram of a calibration process under dual-motor working conditions provided for one embodiment of the present application;

[0022] Figure 6 A schematic diagram of the structure of an oil quantity calibration device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] Figure 1 A schematic diagram of the lubrication oil circuit structure provided in an embodiment of the present application.

[0025] Reference Figure 1 As shown, in the lubrication system, the electronic oil pump 60 filters and sucks the lubricating oil from the oil pan 40 through the suction filter 50, and enters each oil branch line through the electromagnetic clutch 70, specifically, the first motor stator 10a, the first motor rotor 10b, the second motor stator 20a, the second motor rotor 20b and the front bearing 90 for lubrication and cooling. The first motor can be a P1 generator, and the second motor can be a P3 drive motor.

[0026] In some application scenarios, in the entire oil circuit, the amount of oil used for cooling and lubricating the motor stator (i.e., the first motor stator and the second motor stator) accounts for 80% of the total oil pumped by the electronic oil pump 60, and the temperature of the motor affects the vehicle assembly efficiency, so it is more important to cool the first motor (P1 generator) and the second motor (P3 drive motor). In order to achieve accurate cooling of the motor so that the motor is within a preset temperature range, it is necessary to accurately calibrate the control strategy of the electronic oil pump, so as to achieve accurate control of the cooling lubricating oil amount of the motor based on the oil quantity control calibration table obtained after calibration.

[0027] The calibration process of the oil pump control strategy provided in this application is described in detail below with reference to the accompanying drawings.

[0028] To achieve accurate calibration, the embodiment of the present application adds a solenoid valve and a flow meter to the first motor stator oil circuit and the second motor stator oil circuit in the oil circuit system, respectively. Figure 1 As shown, a first solenoid valve 101 can be provided at the entrance of the first motor stator oil circuit, and a first flowmeter 102 can be provided between the first solenoid valve 101 and the first motor stator (P1 generator stator) 10a. In addition, a second solenoid valve 201 can be provided at the entrance of the second motor stator oil circuit, and a second flowmeter 202 can be provided between the second solenoid valve 201 and the second motor stator (P3 drive motor stator) 20a. By providing a solenoid valve and a flowmeter in each of the P1 engine and P3 drive motor stator oil circuits, the duty cycle of the solenoid valve is controlled and closed-loop control is performed according to the data tested by the flowmeter, so as to achieve precise control of the amount of cooling lubricating oil of the motor.

[0029] Figure 2 A schematic flow chart of an oil quantity calibration method provided in accordance with an embodiment of the present application.

[0030] Reference Figure 2 As shown, the oil quantity calibration method may include the following steps:

[0031] S201: Obtain a first preset parameter set, where the first preset parameter set includes a first preset parameter pair corresponding to a first motor stator under a plurality of single motor operating conditions, where the first preset parameter pair includes torque and rotational speed.

[0032] In some embodiments, multiple operating conditions of the first motor may be preset, and the multiple operating conditions may specifically be different powers provided by the first motor under different torques and different speeds. In some embodiments, the first preset parameter set may be a two-dimensional table containing different torques and different speeds, as shown in Table 1 for example:

[0033] Table 1

[0034]

[0035] As shown in Table 1, the preset different working conditions can be power working conditions composed of different motor torques and different motor speeds. Exemplarily, the motor torque of 5Nm and the motor speed of 500r / min can be one of the working conditions, that is, 5Nm and 500r / min constitute a first preset parameter pair; the motor torque of 5Nm and the motor speed of 1000r / min are another working condition, that is, 5Nm and 1000r / min constitute another first preset parameter pair. And so on, two-dimensional data of different working conditions can be set as shown in Table 1. In one embodiment, the torque and speed of the motor in the table can be arranged in order from small to large.

[0036] S202: Calculating a first required oil quantity based on the torque and the speed of each first preset parameter pair.

[0037] In some embodiments, in order to improve the calibration efficiency, the first required oil volume of the motor under each working condition can be estimated in advance, that is, the first required oil volume corresponding to the torque and speed of each first preset parameter pair is calculated. Therefore, in the subsequent calibration process, the electronic oil pump is controlled to pump the first required oil volume to the stator oil of the first motor, and then the subsequent calibration operation is started, which can greatly reduce the calibration time and improve the calibration efficiency.

[0038] For example, based on the above Table 1, the first required oil quantity L under each working condition can be estimated, and the estimated value can be substituted into the table to obtain a list of the first required oil quantities under each working condition as shown in Table 2.

[0039] Table 2

[0040]

[0041]

[0042] In some embodiments, the reasoning process for calculating the first required fuel quantity is as follows:

[0043] Q=C*M*ΔT Formula 1

[0044] Q=P*(1-η)*t Formula 2

[0045] M=L*ρ Formula 3

[0046] C*M*ΔT=P*(1-η)*t Formula 4

[0047] C*(L*ρ)*ΔT=P*(1-η)*t Formula 5

[0048] L=P*(1-η)*t / (C*ρ*ΔT) Formula 6

[0049] Wherein, Q (kW) indicates the heat generated by the motor, which is equal to the power loss of the motor except for work, M (kg) indicates the mass of the lubricating oil, ΔT (℃) indicates the temperature difference of the lubricating oil, and in one embodiment, the temperature difference can be set to an empirical value, which can be calculated at 20℃. P (kW) indicates the power of the motor, η indicates the efficiency of the motor, which can be detected and obtained in advance, t (h) - time, C (kj / kg*k) - specific heat of the lubricating oil, and the empirical value is calculated as 2.15. L (m 3 / h) represents the lubricating oil flow rate, ρ(kg / m 3 ) indicates the density of lubricating oil.

[0050] The calculation formula for the first required oil quantity, namely, Formula 6, can be derived from Formula 1 to Formula 5 above.

[0051] In some embodiments, the first required oil quantity of the first motor stator under multiple working conditions can be calculated based on the above formula 6, so as to obtain the first required oil quantity list under each working condition as shown in Table 2. For example, under the working condition where the motor torque is 5Nm and the motor speed is 500r / min, the calculated first required oil quantity is L1, under the working condition where the motor torque is 5Nm and the motor speed is 1000r / min, the calculated first required oil quantity is L2, ..., and so on, the first required oil quantity under each working condition is calculated to obtain the first required oil quantity list.

[0052] S203: Using the first required oil quantity of each first preset parameter pair as a basic value, calibrate a first target oil quantity when the stator of the first motor meets the first temperature condition under the corresponding working condition.

[0053] In some embodiments, after obtaining the first required oil quantity list provided in S202 , the required oil quantity of the first motor under each operating condition may be calibrated according to a preset sequence.

[0054] In some embodiments, the operating conditions corresponding to the torque and speed in the first preset parameter pair can be divided into a first power condition and a second power condition, wherein the first power is lower than the preset power and the second power is not lower than the preset power, and the preset power can be adaptively set based on user needs and motor model.

[0055] Based on the above working condition classification, when calibrating the oil demand, different working conditions use different comparison temperatures. In one embodiment, under the first power working condition, the temperature condition used for comparison is the first temperature range, and under the second power working condition, the temperature condition used for comparison can be the second temperature range, wherein the second temperature range is higher than the first temperature range. Exemplarily, the first temperature range T1 can be 80℃≤T1≤120℃, and the second temperature range T2 can be 120℃≤T2≤140℃.

[0056] In some embodiments, when calibrating the oil demand of a single motor in multiple working conditions based on a preset order, the current working condition to be calibrated can be determined as the first power working condition or the second power working condition based on the preset power, and then the oil demand calibration is performed based on the corresponding calibration process. Among them, the current working condition to be calibrated can be calculated based on the torque and speed in the first preset parameter pair to be processed to obtain the corresponding power. Specifically, the current working condition to be calibrated can be calculated according to the following formula 7:

[0057] P=(T*N) / mFormula 7

[0058] Wherein, P represents the power of the current working condition to be calibrated, T represents the current first preset parameter centering torque to be processed, N represents the current first preset parameter centering speed to be processed, and m represents the conversion coefficient, such as m=9550. For example, referring to Table 1 or Table 2, the current first preset parameter centering torque to be processed is 5Nm, and the current first preset parameter centering speed to be processed is 500r / min. The power of the current working condition to be calibrated can be calculated by the above formula 7 as P=(5Nm*500r / min) / 9550=0.26KW.

[0059] In some embodiments, when the torque and speed in the first preset parameter pair correspond to the first power (i.e., the current operating condition to be calibrated is the first power condition), the first required oil quantity of the first preset parameter pair is used as the basic value to calibrate the first target oil quantity when the stator of the first motor meets the first temperature range.

[0060] Figure 3 A schematic diagram of the calibration process under the first power condition provided for one embodiment of the present application.

[0061] Reference Figure 3 As shown, when it is determined that the current operating condition to be calibrated is the first power operating condition, calibration can be performed through the following steps:

[0062] S301: Control the electronic oil pump to pump lubricating oil to the stator oil circuit of the first motor according to the first required oil quantity.

[0063] In some embodiments, when it is determined that the current working condition to be calibrated is the first power working condition, the first required oil quantity corresponding to the current working condition to be calibrated can be determined based on the first required oil quantity list obtained in S202. For example, the current working condition to be calibrated is the working condition corresponding to the torque of 5Nm and the speed of 500r / min. The first required oil quantity corresponding to the current working condition to be calibrated is obtained as L1 through the first required oil quantity list shown in Table 2, and the electronic oil pump can be controlled to pump lubricating oil to the stator oil circuit of the first motor according to the first required oil quantity L1.

[0064] S302: Determine whether the current stator temperature falls within a first temperature range.

[0065] In some embodiments, after controlling the electronic oil pump to pump lubricating oil to the first motor stator oil circuit according to the first required oil volume for a certain period of time (such as 30 minutes) or allowing the motor stator to reach a state of thermal equilibrium, the motor stator temperature can be detected to determine whether the current stator temperature falls within the first temperature range.

[0066] S303: When it is determined that the current stator temperature is lower than the minimum temperature in the first temperature range, the pumping flow rate of the electronic oil pump is reduced.

[0067] In some embodiments, based on the temperature detection of S302, when it is determined that the current stator temperature is less than the minimum temperature of the first temperature range, for example, when the first temperature range T1 is 80°C≤T1≤120°C, when it is determined that the current stator temperature is less than 80°C, the pumping flow of the electronic oil pump is reduced, that is, the amount of oil for cooling and lubricating the stator of the first motor is reduced, so that the temperature of the stator of the first motor is increased. In one embodiment, the pumping flow of the electronic oil pump can be reduced by reducing the speed of the electronic oil pump.

[0068] In some embodiments, after the pumping flow rate of the electronic oil pump is regulated, it is necessary to wait until the first motor stator reaches a thermal equilibrium state and then detect whether the current stator temperature falls within the first temperature range, ie, return to execute S302.

[0069] S303: When it is determined that the current stator temperature is greater than the maximum temperature in the first temperature range, the pumping flow rate of the electronic oil pump is increased.

[0070] In some embodiments, based on the temperature detection of S302, when it is determined that the current stator temperature is greater than the maximum temperature of the first temperature range, for example, when the first temperature range T1 is 80°C≤T1≤120°C, when it is determined that the current stator temperature is greater than 120°C, the pumping flow of the electronic oil pump is increased, that is, the amount of oil for cooling and lubricating the stator of the first motor is increased, so that the temperature of the stator of the first motor is reduced. In one embodiment, the pumping flow of the electronic oil pump can be increased by increasing the speed of the electronic oil pump.

[0071] In some embodiments, after the pumping flow rate of the electronic oil pump is regulated, it is necessary to wait until the first motor stator reaches a thermal equilibrium state and then detect whether the current stator temperature falls within the first temperature range, ie, return to execute S302.

[0072] S304: When it is determined that the current stator temperature falls within the first temperature range, the current flow rate is determined to be the first target flow rate.

[0073] In some embodiments, based on the temperature detection of S302, the current stator temperature falls into the first temperature range. For example, when the first temperature range T1 is 80℃≤T1≤120℃, when it is determined that the current stator temperature is greater than or equal to 80℃ and less than or equal to 120℃, the flow data of the first flow meter in the stator oil circuit of the first motor is obtained, and the current flow obtained is determined to be the first target oil volume under the current operating condition, that is, the oil volume demand calibration of the first motor under the current operating condition is completed.

[0074] After completing the oil demand calibration under the current operating condition, you can switch to the next operating condition to be calibrated according to the preset order, and determine whether the next operating condition to be calibrated is the first power condition or the second power condition.

[0075] In some embodiments, when the torque and speed in the first preset parameter pair correspond to the second power (i.e., the current operating condition to be calibrated is the second power condition), the first required oil quantity of the first preset parameter pair is used as a basic value to calibrate the first target oil quantity when the stator of the first motor meets the second temperature range.

[0076] Figure 4 A schematic diagram of the calibration process under the second power condition provided for one embodiment of the present application.

[0077] Reference Figure 4 As shown, when it is determined that the current operating condition to be calibrated is the second power operating condition, calibration can be performed by the following steps:

[0078] S401: Control the electronic oil pump to pump lubricating oil to the stator oil circuit of the first motor according to the first required oil quantity.

[0079] In some embodiments, the specific implementation of S401 may be the same as or similar to that of S301, and will not be described in detail here.

[0080] S402: Determine whether the current stator temperature falls within a first temperature range.

[0081] In some embodiments, after controlling the electronic oil pump to pump lubricating oil to the first motor stator oil circuit according to the first required oil volume for a certain period of time (such as 30 minutes) or allowing the motor stator to reach a state of thermal equilibrium, the motor stator temperature can be detected to determine whether the current stator temperature falls within the second temperature range. Exemplarily, the second temperature range T2 can be 120℃≤T1≤140℃.

[0082] S403: When it is determined that the current stator temperature is lower than the minimum temperature in the second temperature range, the pumping flow rate of the electronic oil pump is reduced.

[0083] In some embodiments, the specific implementation of S403 may be similar to that of S303, and only the temperature range needs to be adaptively modified, and the specific implementation will not be described in detail herein.

[0084] S404: When it is determined that the current stator temperature is greater than the maximum temperature in the second temperature range, the pumping flow rate of the electronic oil pump is increased.

[0085] In some embodiments, the specific implementation of S404 may be similar to that of S304, and only the temperature range needs to be adaptively modified, and the specific implementation will not be described in detail herein.

[0086] S405: When it is determined that the current stator temperature falls within the second temperature range, the current flow rate is determined to be the first target flow rate.

[0087] In some embodiments, based on the temperature detection of S402, the current stator temperature falls into the second temperature range. For example, when the second temperature range T2 is 120℃≤T2≤140℃, when it is determined that the current stator temperature is greater than or equal to 120℃ and less than or equal to 140℃, the flow data of the first flow meter in the stator oil circuit of the first motor is obtained, and the current flow obtained is determined to be the first target oil volume under the current operating condition, that is, the oil volume demand calibration of the first motor under the current operating condition is completed.

[0088] After completing the oil demand calibration under the current operating condition, you can switch to the next operating condition to be calibrated according to the preset order, and determine whether the next operating condition to be calibrated is the first power condition or the second power condition.

[0089] Based on the above Table 2, after calibrating the first target oil volume of the first motor stator under each operating condition based on the type of the current operating condition to be calibrated (first power or second power condition) through the corresponding calibration process, the first target oil volume list under each operating condition can be obtained as shown in Table 3.

[0090] Table 3

[0091]

[0092] By executing S201 to S203 , the first target oil quantity of the first motor stator under each operating condition, that is, the first target oil quantity list, can be obtained, thereby completing the calibration of the first motor stator under the single motor operating condition.

[0093] In some embodiments, the second motor stator may be calibrated in a single motor condition in parallel with the first motor stator in a single motor condition. The specific implementation process is as follows:

[0094] S204: Obtain a second preset parameter set, where the second preset parameter set includes second preset parameter pairs corresponding to the second motor stator under multiple single-motor operating conditions, and the second preset parameter pairs include torque and rotational speed.

[0095] In some embodiments, the specific implementation of S204 may be the same as or similar to that of S201 and will not be described in detail herein.

[0096] S205: Calculating a second required oil quantity based on the torque and the speed of each second preset parameter pair.

[0097] In some embodiments, the specific implementation of S205 may be the same as or similar to that of S202 and will not be described in detail here.

[0098] S206: Using the second required oil quantity of each second preset parameter pair as a base value, calibrate a second target oil quantity when the stator of the second motor meets the second temperature condition under the corresponding working condition.

[0099] In some embodiments, the second target oil quantity of the second motor stator when the second temperature condition is met under the corresponding working condition is calibrated based on the second required oil quantity of each second preset parameter pair as a base value, including: when the torque and speed in the second preset parameter pair correspond to the third power, the second target oil quantity of the second motor stator when the third temperature range is calibrated based on the second required oil quantity of the second preset parameter pair; when the torque and speed in the second preset parameter pair correspond to the fourth power, the second target oil quantity of the second motor stator when the stator meets the fourth temperature range is calibrated based on the second required oil quantity of the second preset parameter pair; wherein the third power is lower than the preset power, the fourth power is not lower than the preset power, and the fourth temperature range is higher than the third temperature range.

[0100] It should be noted that the specific implementation method of S206 may be similar to that of S203, wherein the parameters of the second temperature condition need to be adaptively adjusted, and the specific implementation process will not be repeated here.

[0101] Through S204 to S206, the second target oil volume of the second motor stator under each operating condition can be calibrated through the corresponding calibration process based on the type of the current operating condition to be calibrated (first power or second power condition), and a list of second target oil volumes under each operating condition similar to that shown in Table 3 can be obtained.

[0102] Through S201 to S203, the first target oil quantity list of the first motor electronics under the single motor working condition can be calibrated. In addition, through S204 to S206, the second target oil quantity list of the second motor electronics under the single motor working condition can be calibrated. By calibrating the above two motors (the first motor and the second motor) separately under the single motor working condition, the problem of reduced accuracy of calibration data caused by mutual influence when the two motors work at the same time can be reduced. Furthermore, after obtaining the first target oil quantity list and the second target oil quantity list, the total oil quantity demand calibration under the dual motor working condition can be further performed on this basis.

[0103] S207: Obtain the actual oil quantities corresponding to the first motor stator and the second motor stator under multiple dual-motor operating conditions, and adjust the actual oil quantities to be consistent with the sum of the first target oil quantity and the second target oil quantity under the corresponding single-motor operating condition, and calibrate the current total oil quantity as the target total oil quantity.

[0104] In some embodiments, after obtaining the first target oil quantity list and the second target oil quantity list, the total oil quantity requirement under the dual motor working condition can be further calibrated on this basis. Specifically, in the scenario where the first motor and the second motor are working at the same time, the actual oil quantity corresponding to the first motor stator and the second motor stator under multiple dual motor working conditions is obtained. Among them, the multiple dual motor working conditions can be a combination of one working condition of the first motor and one working condition of the second motor, and then the calibration is performed under the above multiple dual motor working conditions respectively.

[0105] Figure 5 A schematic diagram of the calibration process under dual-motor operating conditions provided for one embodiment of the present application.

[0106] Reference Figure 5 As shown, the process may include the following steps:

[0107] S501: Calculate the required total flow rate based on the first target flow rate and the second target flow rate.

[0108] In some embodiments, reference Figure 1 As shown, the total oil volume L0 pumped by the electronic oil pump in the lubricating oil circuit includes the oil volume La pumped to the electronic oil circuit of the first motor, the oil volume Lb pumped to the stator oil circuit of the second motor, and the oil volume Lc pumped to the rotor oil circuit and bearing oil circuit of the motor (first and second motors). Among them, the oil volume Lc is 20% of the total oil volume L0, that is, La+Lb is 80% of the total oil volume L0. Further, the required total flow rate can be calculated based on the first target flow rate and the second target flow rate. In some embodiments, the required total flow rate under each dual-motor working condition can be calculated in the above manner.

[0109] S502: Control the electronic oil pump to pump lubricating oil to the lubricating oil circuit according to the required total flow rate.

[0110] In some embodiments, after the required total flow rate is calculated, the electronic oil pump can be controlled to pump lubricating oil to the lubricating oil circuit according to the required total flow rate under the current dual-motor operating condition.

[0111] S503: Determine whether the sum of the actual flow rates of the first motor stator and the second motor stator is consistent with the sum of the first target flow rate and the second target flow rate.

[0112] In some embodiments, after the electronic oil pump is controlled to pump lubricating oil to the lubricating oil circuit according to the required total flow rate, the first actual flow rate input to the first motor stator oil circuit can be detected by the first flow meter of the first motor stator oil circuit, and the second actual flow rate input to the second motor stator oil circuit can be detected by the second flow meter of the second motor stator oil circuit, and then the actual flow sum is calculated by summing the first actual flow rate and the second actual flow rate. The first target flow rate and the second target flow rate are summed to obtain the calibrated flow sum. Further, it can be determined whether the actual flow sum is consistent with the calibrated flow sum. If not, S504 is executed, and if consistent, S505 is executed.

[0113] S504: Adjust the pumping flow rate of the electronic oil pump and then return to S503.

[0114] In some embodiments, when it is determined that the actual flow sum is inconsistent with the calibrated flow sum, the rotation speed of the electronic oil pump can be adjusted to adjust the pumping flow of the electronic oil pump, wherein after each adjustment, it can return to S503 to detect whether the actual flow sum is consistent with the calibrated flow sum, and then several adjustments can be made until the actual flow sum is consistent with the calibrated flow sum.

[0115] S505: Calibrate the current total fuel volume as the target total fuel volume.

[0116] In some embodiments, when it is detected that the actual flow rate of the first motor stator and the second motor stator is consistent with the calibrated flow rate, the total oil volume currently pumped by the electronic oil pump to the lubrication oil circuit can be calibrated as the target total oil volume.

[0117] S506: Determine whether the current actual oil volume of the first motor stator is consistent with the first target oil volume under the corresponding single motor working condition, and whether the current actual oil volume of the second motor stator is consistent with the second target oil volume under the corresponding single motor working condition. If they are inconsistent, execute S507; if they are consistent, execute S508.

[0118] In some embodiments, after calibrating the total amount of oil pumped by the current electronic oil pump to the lubricating oil circuit as the target total amount of oil, in order to achieve accurate control of the stator temperature of the first motor and the second motor, it is also necessary to accurately control the actual amount of oil in the stator oil circuit of the first motor and the stator oil circuit of the second motor based on the current target total amount of oil. Specifically, it can be determined whether the current actual amount of oil in the stator of the first motor is consistent with the first target amount of oil under the corresponding single motor working condition, and whether the current actual amount of oil in the stator of the second motor is consistent with the second target amount of oil under the corresponding single motor working condition. If not, S507 is executed.

[0119] S507: After adjusting the duty ratio of the first solenoid valve and the second solenoid valve, return to S506.

[0120] In some embodiments, the flow rate flowing into the stator oil circuit of the first motor and the flow rate flowing into the stator oil circuit of the second motor can be adjusted by adjusting the duty ratio of the first solenoid valve on the stator oil circuit of the first motor and the second solenoid valve on the stator oil circuit of the second motor. After each adjustment, the flow rate can be returned to S506 for detection, and then the actual flow rate can be adjusted several times until the total flow rate is consistent with the total flow rate of the calibration. If it is determined through S506 that the actual oil volume of the current first motor stator is consistent with the first target oil volume under the corresponding single motor working condition, and the actual oil volume of the current second motor stator is consistent with the second target oil volume under the corresponding single motor working condition, then S508 is executed.

[0121] S508: Determine the duty ratio of the first solenoid valve and the second solenoid valve.

[0122] In some embodiments, after calibrating the total amount of oil currently pumped by the electronic oil pump to the lubrication oil circuit as the target total amount of oil, the duty cycle of the first solenoid valve and the second solenoid valve is determined based on the calibration information, so that the flow rate flowing into the first motor stator oil circuit and the second motor stator oil circuit is precisely controlled based on the duty cycle, thereby achieving precise control of the temperature of the first motor stator and the second motor stator, thereby improving the performance of the motor and improving the efficiency of the assembly.

[0123] S208: Summarize the target total oil volumes under multiple dual-motor operating conditions to form an oil volume control calibration table.

[0124] In some embodiments, after obtaining the target total oil volumes under multiple dual-motor working conditions through S501 to S508, the target total oil volumes under multiple dual-motor working conditions can be summarized to form an oil volume control calibration table. In some embodiments, the oil volume control calibration table can also include the duty cycle of the first solenoid valve and the duty cycle of the second solenoid valve corresponding to each target total oil volume.

[0125] Figure 6 A schematic diagram of the structure of an oil quantity calibration device provided in one embodiment of the present application.

[0126] Reference Figure 6 As shown, an embodiment of the present application provides an oil quantity calibration device, which may include: a processor 601 and a memory 602, the memory 602 is used to store at least one instruction, and when the instruction is loaded and executed by the processor 601, the oil quantity calibration method provided by any embodiment of the present application is implemented.

[0127] An embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the oil quantity calibration method provided in any embodiment of the present application is implemented.

[0128] The present application also provides a motor controller, which may include Figure 6The oil quantity calibration device shown.

[0129] The embodiment of the present application also provides an oil pump control system, the system comprising:

[0130] An electronic oil pump, used to pump lubricating oil into the lubricating oil circuit;

[0131] A first solenoid valve is arranged in the stator oil circuit of the first motor and is used to control the amount of oil input into the stator oil circuit of the first motor by adjusting the duty cycle;

[0132] a first flow meter, disposed between the first electronic valve and the first motor stator, for detecting the amount of oil input into the first motor stator oil circuit;

[0133] A first temperature sensor, used to detect the temperature of the stator of the first motor;

[0134] A second solenoid valve is disposed in the stator oil circuit of the second motor and is used to control the amount of oil input into the stator oil circuit of the second motor by adjusting the duty cycle;

[0135] A second flow meter, disposed between the second electronic valve and the second motor stator, for detecting the amount of oil input into the second stator oil circuit;

[0136] A second temperature sensor, used for detecting the temperature of the stator of the second motor;

[0137] The motor controller is respectively connected to the electronic oil pump, the first solenoid valve, the first flow meter, the first temperature sensor, the second solenoid valve, the second flow meter and the second temperature sensor; and is used to control the electronic oil pump to output a target total oil volume according to an oil volume control calibration table based on the current motor operating condition, control the first electronic valve to output a first target oil volume to the first motor stator oil circuit through a target duty cycle, and control the second electronic valve to output a second target oil volume to the second motor stator oil circuit through a target duty cycle.

[0138] An embodiment of the present application also provides a vehicle, which may include the oil pump control system provided in the embodiment of the present application.

[0139] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0140] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0141] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0142] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0143] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (Processor) to perform some steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), disk or optical disk and other media that can store program codes.

[0144] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

[0145] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for oil quantity calibration, characterized in that: The method comprises: Obtaining a first preset parameter set, the first preset parameter set including first preset parameter pairs corresponding to the first motor stator under multiple single motor operating conditions, the first preset parameter pairs including torque and speed; calculating a first required oil quantity based on the torque and speed of each first preset parameter pair; and calibrating a first target oil quantity when the first motor stator meets a first temperature condition under the corresponding operating condition based on the first required oil quantity of each first preset parameter pair as a base value; Obtain a second preset parameter set, the first preset parameter set including second preset parameter pairs corresponding to the second motor stator under multiple single motor working conditions, the second preset parameter pairs including torque and speed; calculate a second required oil quantity based on the torque and speed of each second preset parameter pair; calibrate a second target oil quantity when the second motor stator meets the second temperature condition under the corresponding working condition based on the second required oil quantity of each second preset parameter pair; Acquire the actual oil quantities corresponding to the first motor stator and the second motor stator under multiple dual-motor operating conditions, adjust the actual oil quantities to be consistent with the sum of the first target oil quantity and the second target oil quantity under the corresponding single-motor operating condition, and calibrate the current total oil quantity as the target total oil quantity; The target total oil volume under multiple dual-motor operating conditions is summarized to form an oil volume control calibration table.

2. The method according to claim 1, characterized in that The first required oil quantity of each first preset parameter pair is used as a basic value to calibrate the first target oil quantity when the stator of the first motor meets the first temperature condition under the corresponding working condition, including: When the torque and the speed in the first preset parameter pair correspond to the first power, the first target oil quantity when the stator of the first motor meets the first temperature range is calibrated based on the first required oil quantity of the first preset parameter pair; When the torque and the speed in the first preset parameter pair correspond to the second power, the first target oil quantity when the stator of the first motor stator meets the second temperature range is calibrated based on the first required oil quantity of the first preset parameter pair; The first power is lower than a preset power, the second power is not lower than a preset power, and the second temperature range is higher than the first temperature range.

3. The method according to claim 1, characterized in that: The second target oil quantity when the second motor stator load meets the second temperature condition under the corresponding working condition is calibrated based on the second required oil quantity of each second preset parameter pair, including: When the torque and the speed in the second preset parameter pair correspond to the third power, the second target oil quantity when the stator of the second motor meets the third temperature range is calibrated based on the second required oil quantity of the second preset parameter pair; When the torque and the speed in the second preset parameter pair correspond to the fourth power, the second target oil quantity when the stator of the second motor stator meets the fourth temperature range is calibrated based on the second required oil quantity of the second preset parameter pair; The third power is lower than a preset power, the fourth power is not lower than a preset power, and the fourth temperature range is higher than the third temperature range.

4. The method according to claim 1, characterized in that After calibrating the current total oil volume as the target total oil volume and before summarizing the target total oil volumes under multiple dual-motor working conditions to form an oil volume control calibration table, the method further includes: Determine whether the current actual oil amount of the first motor stator is consistent with the first target oil amount under the corresponding single motor working condition, and if not, adjust the current actual oil amount of the first motor stator to be consistent with the first target oil amount based on the target total oil amount; Determine whether the current actual oil volume of the second motor stator is consistent with the second target oil volume under the corresponding single motor working condition. If not, adjust the current actual oil volume of the second motor stator to be consistent with the second target oil volume based on the target total oil volume.

5. The method according to claim 4, characterized in that The step of adjusting the current actual oil amount of the first motor stator to be consistent with the first target oil amount comprises: Adjusting the duty cycle of the first solenoid valve in the stator oil circuit of the first motor until the actual oil volume of the stator of the first motor is consistent with the first target oil volume; The step of adjusting the current actual oil amount of the second motor stator to be consistent with the second target oil amount comprises: The duty cycle of the second solenoid valve in the second motor stator oil circuit is adjusted until the current actual oil volume of the second motor stator is consistent with the second target oil volume.

6. An oil quantity calibration device, characterized in that: The device comprises: A processor and a memory, wherein the memory is used to store at least one instruction, and when the instruction is loaded and executed by the processor, the oil quantity calibration method according to any one of claims 1 to 5 is implemented.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the oil quantity calibration method as described in any one of claims 1 to 5 is implemented.

8. A motor controller, characterized in that: The motor controller includes the oil quantity calibration device according to claim 6.

9. An oil pump control system, characterized in that: The system comprises: An electronic oil pump, used to pump lubricating oil into the lubricating oil circuit; A first solenoid valve is arranged in the stator oil circuit of the first motor and is used to control the amount of oil input into the stator oil circuit of the first motor by adjusting the duty cycle; a first flow meter, disposed between the first electronic valve and the first motor stator, for detecting the amount of oil input into the first motor stator oil circuit; A first temperature sensor, used to detect the temperature of the stator of the first motor; A second solenoid valve is disposed in the stator oil circuit of the second motor and is used to control the amount of oil input into the stator oil circuit of the second motor by adjusting the duty cycle; A second flow meter, disposed between the second electronic valve and the second motor stator, for detecting the amount of oil input into the second stator oil circuit; A second temperature sensor, used for detecting the temperature of the stator of the second motor; The motor controller is respectively connected to the electronic oil pump, the first solenoid valve, the first flow meter, the first temperature sensor, the second solenoid valve, the second flow meter and the second temperature sensor; and is used to control the electronic oil pump to output a target total oil volume according to an oil volume control calibration table based on the current motor operating condition, control the first electronic valve to output a first target oil volume to the first motor stator oil circuit through a target duty cycle, and control the second electronic valve to output a second target oil volume to the second motor stator oil circuit through a target duty cycle.

10. A vehicle, characterized in that: The vehicle includes the oil pump control system according to claim 9.

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