Control method and apparatus for cooling oil pump of oil-cooled motor, device and medium

Abstract

A control method and apparatus for a cooling oil pump of an oil-cooled motor, a device, and a medium. The method comprises: acquiring a current heating power loss of a motor; according to a power interval where the heating power loss is located, determining a current operating condition of a vehicle; according to the current operating condition of the vehicle, determining a target temperature for lubricating oil; according to the current operating condition of the vehicle, the current heating power loss of the motor and the target temperature for the lubricating oil, determining a target flow of an oil pump; according to the target flow of the oil pump, determining a target rotating speed of the oil pump. The present method does not require the rotating speed of the oil pump to be frequently adjusted, thereby ensuring the service life of the oil pump.

Description

Control method, device, equipment and medium for cooling oil pump of oil-cooled motor

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202310760914.7 filed on June 27, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to the field of automobile control technology, and in particular to a control method, device, equipment and medium for a cooling oil pump of an oil-cooled motor. Background Art

[0004] Due to the insulation safety of the motor enameled wire, the oil-cooled motor cooling system needs to be independent of the external water cooling system, and heat exchange is carried out through a heat exchanger or other heat exchange structure and cooling water circuit to achieve heat dissipation of the oil-cooled motor.

[0005] The current mainstream oil circuit cooling system uses an independent electronic oil pump for control. Independent oil pump control effectively matches the motor's operating conditions. In related technologies, as vehicle speed changes, the motor's operating conditions also change, requiring corresponding oil pump speed control to meet the motor's cooling requirements. However, this results in frequent oil pump speed fluctuations, shortening the pump's service life. Therefore, ensuring the oil pump's service life is a pressing issue.

[0006] Summary of the Invention

[0007] By utilizing the control methods, devices, equipment, and media for the oil-cooled motor cooling pump according to one or more embodiments of the present disclosure, a vehicle can be divided into multiple operating conditions based on the power range within which the motor's lost heat power falls. The vehicle's operating condition only changes when the lost heat power range changes, necessitating control of the oil pump speed. This simplifies the control process, eliminates the need for frequent oil pump speed adjustments, and ensures the oil pump's service life.

[0008] In a first aspect, the present disclosure provides a method for controlling an oil pump of an oil-cooled motor, comprising: obtaining the current heat loss power of the motor; determining the current operating condition of the vehicle based on the power range in which the heat loss power is located, with different power ranges corresponding to different operating conditions; determining the target temperature of the lubricating oil based on the current operating condition of the vehicle; determining the target flow rate of the oil pump based on the current operating condition of the vehicle, the current heat loss power of the motor and the target temperature of the lubricating oil; and determining the target speed of the oil pump based on the target flow rate of the oil pump.

[0009] In a second aspect, the present disclosure provides a control device for an oil-cooled motor cooling oil pump, comprising: an acquisition module for acquiring the current loss heat power of the motor; an operating condition determination module for determining the current operating condition of the vehicle based on the power range in which the loss heat power is located, with different power ranges corresponding to different operating conditions; a temperature determination module for determining the target temperature of the lubricating oil based on the current operating condition of the vehicle; a flow determination module for determining the target flow of the oil pump based on the current operating condition of the vehicle, the current loss heat power of the motor and the target temperature of the lubricating oil; and a speed determination module for determining the target speed of the oil pump based on the target flow of the oil pump.

[0010] In a third aspect, the present disclosure provides an electronic device comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, computer instructions are stored in the memory, and the processor executes the control method as described in the first aspect by executing the computer instructions.

[0011] In a fourth aspect, the present disclosure provides a computer-readable storage medium, comprising computer instructions stored thereon, wherein when the computer instructions are executed by the computer, the computer is prompted to implement the control method as described in the first aspect.

[0012] The above description is only an overview of the technical solution of the present disclosure. In order to more clearly understand the technical means of the present disclosure, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present disclosure more obvious and easy to understand, the specific implementation methods of the present disclosure are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG1 shows a flow chart of a method for controlling a cooling oil pump for an oil-cooled motor according to some embodiments of the present disclosure;

[0014] FIG2 shows a flow chart of a method for controlling a cooling oil pump for an oil-cooled motor according to other embodiments of the present disclosure;

[0015] FIG3 shows a curve showing the relationship between an electric drive speed and an oil pump speed threshold according to some embodiments of the present disclosure;

[0016] FIG4 shows a flow chart of a method for controlling a cooling oil pump for an oil-cooled motor according to yet other embodiments of the present disclosure;

[0017] FIG5 shows a schematic diagram of a relationship curve between lubricating oil temperature and viscosity according to some embodiments of the present disclosure;

[0018] FIG6 shows a schematic diagram of a relationship curve between lubricating oil temperature and oil pump current according to some embodiments of the present disclosure;

[0019] FIG7 shows a structural block diagram of a control device for a cooling oil pump of an oil-cooled motor according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0020] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0021] Before introducing in detail the hydrogen leakage detection method for fuel cell vehicles according to some embodiments of the present disclosure, a brief introduction to the implementation environment involved in the embodiments of the present disclosure is first given.

[0022] FIG1 is a flow chart of a method for controlling a cooling oil pump of an oil-cooled motor according to some embodiments of the present disclosure. As shown in FIG1 , the control method includes steps S110 to S150 .

[0023] In step S110 , the current loss heating power of the motor is obtained.

[0024] In some embodiments, the current heat loss power of the motor can be calculated according to the following formula (1):

[0025] Among them, P 损耗 represents the heat loss power, T represents the wheel-end torque, n represents the wheel-end speed, and θ represents the efficiency at the electric drive efficiency map point. Wheel-end torque T, wheel-end speed n, and the efficiency at the electric drive efficiency map point θ can all be obtained by calibrating the direct-axis current id and quadrature-axis current iq using the current loop. This is conventional technology and will not be further described here.

[0026] In step S120, the current operating condition of the vehicle is determined according to the power range in which the lost heat power is located.

[0027] In some embodiments, the operating conditions include a first operating condition, a second operating condition, and a third operating condition. The operating load spectrum of the entire vehicle is converted into an electric drive load spectrum, and is divided into a multi-operating condition operating mode in order to predict the vehicle driving habits. In some embodiments, the first operating condition corresponds to a low load, which may be an urban operating condition, the second operating condition corresponds to a medium load, which may be a high-speed operating condition, and the third operating condition corresponds to a high load, which may be an extreme operating condition. The heat loss power of the electric drive is used as a mark to distinguish the operating conditions. In other embodiments, the operating conditions may also be divided into more than three operating conditions or less than three operating conditions according to actual needs, and the present disclosure does not limit this.

[0028] In some embodiments, step S120 includes:

[0029] When the loss heat generation power is less than or equal to the first power threshold, the loss heat generation power is in the first power range, and the current operating condition of the vehicle is determined to be the first operating condition; when the loss heat generation power is greater than the first power threshold and less than or equal to the second power threshold, the loss heat generation power is in the second power range, and the current operating condition of the vehicle is determined to be the second operating condition; when the loss heat generation power is greater than the second power threshold, the loss heat generation power is in the third power range, and the current operating condition of the vehicle is determined to be the third operating condition.

[0030] In some embodiments, the first power threshold can be set to 3kW, and the second power threshold can be set to 7kW. When the heat loss power is less than or equal to 3kW, it is the first operating condition (low load), when the heat loss power is greater than 7kW, it is the third operating condition (high load), and when the heat loss power is between 3-7kW, it is the second operating condition (medium load).

[0031] In step S130, the target temperature of the lubricating oil is determined according to the current operating condition of the vehicle.

[0032] In some embodiments, the lubricating oil target temperature represents the lubricating oil temperature at which the lubricating oil is pumped out to the heat exchanger.

[0033] In some embodiments, step S130 includes:

[0034] When the vehicle's current operating condition is the first operating condition, the lubricating oil target temperature is determined to be the first target oil temperature; when the vehicle's current operating condition is the second operating condition, the lubricating oil target temperature is determined to be the second target oil temperature; when the vehicle's current operating condition is the third operating condition, the lubricating oil target temperature is determined to be the third target oil temperature.

[0035] In some embodiments, the first target oil temperature T1 is greater than the ideal lubricating oil temperature T0 , the second target oil temperature T2 is equal to the ideal lubricating oil temperature T0 , and the third target oil temperature T3 is less than the ideal lubricating oil temperature T0 .

[0036] For example, the ideal lubricating oil temperature can be determined through testing. For example, the lubricating oil's anti-adhesion ability and efficiency can be tested under the maximum allowable temperature of the lubricating oil. The temperature at which the tested performance is the best is determined as the ideal lubricating oil temperature. The ideal lubricating oil temperature may also vary for different lubricating oil models and usage scenarios. In some embodiments, the ideal lubricating oil temperature is 80-100°C.

[0037] In some embodiments, the control method may further include:

[0038] The motor stator target temperature is determined based on the vehicle's current operating conditions, and the motor stator temperature is controlled within the target temperature range.

[0039] In some embodiments, when the vehicle's current operating condition is a first operating condition, the motor stator target temperature is determined to be a first target stator temperature; when the vehicle's current operating condition is a second operating condition, the motor stator target temperature is determined to be a second target stator temperature; when the vehicle's current operating condition is a third operating condition, the motor stator target temperature is determined to be a third target stator temperature.

[0040] In some embodiments, the first target stator temperature M1 is greater than the second target stator temperature M2 , the second target stator temperature M2 is greater than the third target stator temperature M3 , the first target stator temperature M1 is less than a stator temperature threshold M0 , and the stator temperature threshold M0 is 150° C.

[0041] In some embodiments, the target setting of the motor stator temperature is similar to the target setting of the lubricating oil temperature. Only when both are within the allowable range can the electric drive operate stably.

[0042] Step S140: Determine the target flow rate of the oil pump according to the current operating condition of the vehicle, the current heat loss power of the motor, and the target temperature of the lubricating oil.

[0043] In some embodiments, step S140 may include:

[0044] When the vehicle's current operating condition is the first operating condition or the second operating condition, the target flow rate of the oil pump is calculated according to the following formulas (2)-(4): q=(k*P 损耗 ) / [ρ 润滑油 (T 油入口 '-T 油出口 )]; (2) T 油出口 =T 水出口 ; (3) T 水出口 =[(k*P 损耗 ) / (ρ 冷却水 *q 冷却水 )]+T 水入口 ; (4)

[0045] Among them, q represents the target flow rate of the oil pump, P 损耗 Indicates the current loss of heat power of the motor, k represents the safety factor, k is a constant greater than 1, ρ 润滑油 Indicates the density of lubricating oil, T 油入口 '、T 油出口 、T 水出口 、T 水入口 They represent the oil inlet target temperature, oil outlet temperature, water outlet temperature and water inlet temperature of the heat exchanger respectively. The oil inlet target temperature T 油入口 ' is equal to the target temperature of the lubricating oil, ρ 冷却水 represents the density of cooling water, q 冷却水 Indicates the cooling water flow rate.

[0046] In some embodiments, the heat exchanger has four ports, namely, oil inlet, oil outlet, water inlet and water outlet. The lubricating oil pumped out by the oil pump enters the oil inlet of the heat exchanger, so the target oil inlet temperature T 油入口 ' is equal to the target temperature of the lubricating oil. T 水入口 It is usually set to the water inlet temperature under the third working condition, which is generally 65°C. k=1~1.5, which can be set according to actual needs. Therefore, P in the above formula (2) 损耗 ,k,ρ 润滑油 、T 油入口 ' are all known quantities, and T 油出口 The temperature can be calculated according to formula (3) and formula (4), so the target flow rate q of the oil pump can be calculated in the end.

[0047] When the vehicle is currently operating in the first operating condition, the corresponding oil inlet target temperature T 油入口 ' is T1, at this time the corresponding oil pump target flow can be calculated as q1. When the vehicle's current operating condition is the second operating condition, the corresponding oil inlet target temperature T 油入口 ' is T2, at this time the corresponding oil pump target flow rate can be calculated as q2.

[0048] In some embodiments, the third operating condition accounts for a very small proportion of the vehicle's actual use and has a short operating time, mostly involving full-power starting and high-speed overtaking driving. Furthermore, the losses in the third operating condition mostly exceed the vehicle's heat dissipation capacity. Therefore, a short-term operation system can be used to address the third operating condition. For example, the electric drive peak power is only required to operate for 1 minute. Based on the product usage scenario definition, the minimum flow rate required by the vehicle's oil pump in the third operating condition can be determined through testing as the oil pump target flow rate q3. In some embodiments, the electric drive can be controlled to operate at peak power for different periods of time, and then the required oil pump flow rate can be tested at the target lubricant oil temperature and stator target temperature.

[0049] Step S150: Determine the target speed of the oil pump according to the target flow rate of the oil pump.

[0050] In some embodiments, step S150 includes:

[0051] The target speed of the oil pump is calculated according to the following formula (5):

[0052] Among them, n 油泵 represents the target speed of the oil pump, q represents the target flow rate of the oil pump, ε represents the volumetric efficiency of the oil pump, V 排 Indicates the maximum displacement of the oil pump itself. q in the above formula (5) can be calculated in step S140, ε can be obtained by measurement, and V 排 is a known quantity.

[0053] The above control method determines the current operating condition of the vehicle by obtaining the current loss heat power of the motor. After determining the current operating condition of the vehicle, the target flow of the oil pump can be determined by determining the target temperature of the lubricating oil corresponding to the operating condition, and then combining the loss heat power under the operating condition to determine the target flow of the oil pump, thereby determining the target speed of the oil pump corresponding to the operating condition. This control method can achieve precise control of the oil pump speed under the lubricating oil temperature control target, meet the heat dissipation requirements of the motor, and ensure that the motor operates in a high-efficiency state as a whole. At the same time, the oil pump speed change is only controlled when the vehicle operating condition changes. The operating conditions only include the first condition, the second condition, and the third condition. The control is simple and there is no need to frequently adjust the oil pump speed, thereby ensuring the service life of the oil pump.

[0054] The present disclosure also provides another method for controlling a cooling oil pump for an oil-cooled motor. FIG2 is a flow chart of another method for controlling a cooling oil pump for an oil-cooled motor according to some embodiments of the present disclosure. As shown in FIG2 , the control method includes steps S210 to S290:

[0055] Step S210: Obtain the current loss heating power of the motor.

[0056] Step S220: Determine the current operating condition of the vehicle according to the power range where the lost heat power is located.

[0057] In some embodiments, the operating conditions include a first operating condition, a second operating condition, and a third operating condition.

[0058] Step S230: Determine the target temperature of the lubricating oil according to the current operating condition of the vehicle.

[0059] Step S240: Determine the target flow rate of the oil pump according to the current operating condition of the vehicle, the current heat loss power of the motor, and the target temperature of the lubricating oil.

[0060] Step S250: Determine the target speed of the oil pump according to the target flow rate of the oil pump.

[0061] The above steps S210 to S250 are the same as steps S110 to S150 in the above embodiment. For details, please refer to the relevant description of steps S110 to S150, which will not be repeated here.

[0062] Step S260: When the current operating condition of the vehicle is the first operating condition or the second operating condition, obtain the oil pump speed threshold allowed by the vehicle under NVH.

[0063] Since the oil pump itself is also a rotating part, it will generate a certain amount of radiation noise, so it is necessary to determine the allowable noise boundary of the oil pump speed during the operation of the vehicle. In some embodiments, the maximum uniform noise speed of the oil pump at different speeds and torques of the electric drive can be tested through NVH (Noise, Vibration, Harshness) test equipment, and finally a curve is obtained showing the relationship between the electric drive motor speed n and the oil pump speed threshold n noise under NVH. As shown in Figure 3, at high speeds, the tire noise and wind noise of the vehicle dominate, and the contribution of the oil pump speed is relatively small, so the three operating curves can be merged into one curve. However, at low speeds, the wind noise and tire noise of the vehicle are relatively small. In this case, n 噪声 It is necessary to distinguish them in combination with the working conditions. In the third working condition (working condition 3 in Figure 3), the working load is high, and the electric drive noise is dominant. 噪声 It will be higher; in the first working condition (working condition 1 in Figure 3), the working load is low, and the contribution of electric drive noise is weakened. 噪声 In the second working condition (working condition 2 in Figure 3), the load is between the third working condition and the first working condition, and the corresponding n 噪声 Located between the third working condition and the first working condition.

[0064] Therefore, the corresponding oil pump speed threshold value n under the current vehicle operating conditions and current electric drive speed can be determined by the relationship curve shown in FIG3 . 噪声 size.

[0065] It should be noted that, in some embodiments, when the current operating condition of the vehicle is the third operating condition, the oil pump is still controlled to rotate at the oil pump target speed n 油泵 run.

[0066] Step S270: Compare the oil pump target speed with the oil pump speed threshold.

[0067] In some embodiments, when the oil pump target speed is less than or equal to the oil pump speed threshold, that is, n 油泵 ≤n 噪声 When , it means that the heat dissipation speed is within the maximum noise allowable speed, then step S280 can be further executed. On the contrary, when the oil pump target speed is greater than the oil pump speed threshold, that is, n油泵 >n 噪声 When the heat dissipation speed exceeds the maximum noise allowable speed, execute n 油泵 The instruction may cause the noise quality of the entire vehicle cab to deteriorate, and in this case, step S290 may be further executed.

[0068] Step S280: When the oil pump target speed is less than or equal to the oil pump speed threshold, control the oil pump to operate at the oil pump target speed.

[0069] Step S290: When the oil pump target speed is greater than the oil pump speed threshold, determine the theoretical oil inlet temperature of the heat exchanger under the oil pump speed threshold, and control the oil pump to operate at the oil pump target speed or to operate at a reduced rate according to the theoretical oil inlet temperature of the heat exchanger.

[0070] In some embodiments, the oil pump speed threshold n can be determined according to the following formulas (6) to (8) and formula (4): 噪声 Under the condition of heat exchanger, the theoretical oil inlet temperature T 油入口 ”: T 油入口 ”=[(k*P 损耗 ) / (ρ 润滑油 *q')]+T 油出口 ; (6) q'=n 噪声 *ε*V 排 ; (7) T 油出口 =T 水出口 ; (8) T 水出口 =[(k*P 损耗 ) / (ρ 冷却水 *q 冷却水 )]+T 水入口 (4)

[0071] In some embodiments, step S290 may include:

[0072] Compare the theoretical oil inlet temperature T of the heat exchanger 油入口 '' and temperature threshold T 阈 size;

[0073] When the theoretical oil inlet temperature of the heat exchanger is T 油入口 '' is less than or equal to the temperature threshold T 阈 When the oil pump is controlled to the oil pump speed threshold n 噪声 run;

[0074] When the theoretical oil inlet temperature of the heat exchanger is T 油入口 '' is greater than the temperature threshold T 阈 When the oil pump is controlled to rotate at the target speed n 油泵 run.

[0075] Among them, T 阈 It can be set according to actual needs, different types of lubricating oil, T 阈 In some embodiments, the T threshold can be set to 130°C. 油入口 ''≤T 阈 When the oil pump speed is n 噪声 Under this condition, the lubricating oil temperature will not be overheated. At this time, the oil pump can be controlled to the oil pump speed threshold n 噪声 Run. When T油入口 ''>T 阈 When the oil pump speed is n 噪声 Under this condition, the lubricating oil temperature will be too high, and derating operation is not allowed at this time. The oil pump can be controlled to run at the target speed n. 油泵 run.

[0076] The above control method controls the oil pump speed by combining the NVH performance of the entire vehicle to ensure the noise quality in the vehicle cab.

[0077] The present disclosure also provides another method for controlling a cooling oil pump for an oil-cooled motor. FIG4 is a flow chart of another method for controlling a cooling oil pump for an oil-cooled motor according to some embodiments of the present disclosure. As shown in FIG4 , the control method includes steps S410 to S492:

[0078] Step S410: obtaining the current loss heating power of the motor;

[0079] Step S420: Determine the current operating condition of the vehicle according to the power range where the lost heat power is located.

[0080] In some embodiments, the operating conditions include a first operating condition, a second operating condition, and a third operating condition.

[0081] Step S430: Determine the target temperature of the lubricating oil according to the current operating condition of the vehicle.

[0082] Step S440: Determine the target flow rate of the oil pump according to the current operating condition of the vehicle, the current heat loss power of the motor, and the target temperature of the lubricating oil.

[0083] Step S450: Determine the target speed of the oil pump according to the target flow rate of the oil pump.

[0084] The above steps S410 to S450 are the same as steps S110 to S150 in the above embodiment. For details, please refer to the relevant description of steps S110 to S150, which will not be repeated here.

[0085] Step S460: Obtain the external characteristic flow curve of the oil pump.

[0086] In some embodiments, the external characteristic flow curve of the oil pump is a curve showing the relationship between the temperature of the lubricating oil pumped out by the oil pump and the maximum speed of the oil pump. The external characteristic flow curve can be provided by the manufacturer or obtained through testing, and there is no limitation on this.

[0087] Step S470: Estimate the theoretical temperature of the lubricating oil pumped out by the oil pump using an oil temperature estimation method.

[0088] Because the viscosity of lubricating oil changes inversely with its temperature and is directly reflected in the oil pump load, a certain mapping relationship exists between the oil pump load and the oil temperature. In particular, since the viscosity of lubricating oil remains essentially unchanged above a certain temperature threshold, the effect of lubricating oil viscosity on the oil pump load can be amplified by increasing the oil pump speed. Simultaneously, during control, the oil temperature can be reflected by the oil pump DC current after intermittently increasing the oil pump speed. The above relationship between oil temperature T and oil pump current I can be determined through bench calibration.

[0089] FIG5 is a diagram illustrating a relationship curve between lubricating oil temperature and viscosity according to some embodiments of the present disclosure. As shown in FIG5 , the higher the lubricating oil temperature T, the lower the corresponding lubricating oil viscosity η. Furthermore, the lubricating oil viscosity η tends to stabilize after the oil temperature T exceeds a certain threshold.

[0090] FIG6 is a schematic diagram of a relationship curve between lubricating oil temperature and oil pump current according to some embodiments of the present disclosure. As shown in FIG6 , the higher the lubricating oil temperature T, the greater the oil pump current I. Furthermore, the change in the oil pump current I in the high temperature range is greater than the change in the oil pump current I in the low temperature range.

[0091] This oil temperature estimation method uses the inherent characteristics of lubricating oil viscosity and the current load characteristics of the oil pump to calibrate the oil temperature curve shown in Figures 5 and 6. Based on this oil temperature curve, the lubricating oil temperature T at the corresponding lubricating oil viscosity η or oil pump current I can be estimated.

[0092] This method can save the investment of an oil temperature sensor and save costs. Since there is a certain deviation in the estimated oil temperature, the estimated oil temperature can also serve as an early warning when the motor stator temperature sensor is normal. For example, when the estimated oil temperature is greater than (oil temperature threshold / safety factor), the oil temperature is treated as overtemperature and the oil pump speed is directly adjusted to the maximum speed value of the external characteristic until the estimated oil temperature returns to the normal range. In the event of failure of the motor stator temperature sensor, the estimated oil temperature can also replace the stator temperature sensor to achieve redundant control in the event of a motor temperature sensor failure. Finally, the oil temperature estimation can be combined with the characteristics of the oil pump itself to determine the maximum external characteristic flow rate of the oil pump itself, which can more accurately control the oil pump load within a reasonable range.

[0093] Step S480: Determine the theoretical speed of the oil pump corresponding to the theoretical temperature of the lubricating oil according to the external characteristic flow curve.

[0094] In some embodiments, when the theoretical temperature T of the lubricating oil is determined according to the oil temperature estimation method, 理论 After that, T can be determined according to the external characteristic flow curve. 理论 Corresponding oil pump theoretical speed n 理论 .

[0095] Furthermore, we can compare the theoretical speed of the oil pump n 理论 and the oil pump target speed n 油泵 When n 油泵 ≤n 理论 When n 油泵 >n 理论 , step S492 may be further executed.

[0096] Step S491: When the oil pump target speed is less than or equal to the oil pump theoretical speed, control the oil pump to operate at the oil pump target speed.

[0097] Step S492: When the target speed of the oil pump is greater than the theoretical speed of the oil pump, control the oil pump to operate at the theoretical speed of the oil pump.

[0098] In some embodiments, the control method may further include:

[0099] During the operation of the oil pump, if the motor stator temperature or lubricating oil temperature is abnormal, the oil pump is controlled to run at the theoretical speed of the oil pump.

[0100] Specifically, the lubricating oil temperature can be obtained by the above oil temperature estimation method, that is, the theoretical temperature T of the lubricating oil pumped out by the oil pump can be estimated by the oil temperature estimation method. 理论 When T 理论 >T 阈 When the motor stator temperature M exceeds the stator temperature threshold M0, that is, M>M0, it indicates that the motor stator temperature is abnormal.

[0101] In some embodiments, T 阈 It can be set to 130℃, M0 is 150℃.

[0102] The above control method estimates the oil temperature and combines the characteristics of the oil pump itself to determine the maximum external characteristic flow rate of the oil pump itself, which can more accurately control the oil pump load within a reasonable range.

[0103] It should be noted that, in the above embodiment, the control method provided in the embodiment of FIG2 can determine whether the final 油泵 Or n 噪声 The control method provided by the embodiment of FIG4 can determine whether the final speed is n 油泵 Or n 理论 In one embodiment of the present disclosure, the control methods provided in the embodiments of FIG. 2 and FIG. 4 may be combined. For example, when the control method provided in the embodiment of FIG. 2 determines that the oil pump speed is controlled according to n 油泵When the speed of the oil pump is controlled by the command, the control method shown in FIG4 can be further executed to determine whether the speed command output by the oil pump is n 油泵 Or n 理论 Alternatively, when the control method provided in the embodiment of FIG. 4 determines that n 油泵 When the speed of the oil pump is controlled by the command, the control method shown in Figure 2 can be further executed to determine whether the speed command output by the oil pump is n 油泵 Or n 噪声 In another implementation of the present disclosure, the control methods provided in the embodiments of FIG. 2 and FIG. 4 may be executed synchronously. When the control methods provided in the embodiments of FIG. 2 and FIG. 4 are executed synchronously, the oil pump speed instructions finally obtained are different, for example, n and n respectively. 噪声 and n 理论 When , the smaller value can be selected as the speed command finally output by the oil pump.

[0104] Based on the same inventive concept, embodiments of the present disclosure further provide a control device for an oil-cooled motor cooling oil pump. FIG7 is a structural block diagram of a control device for an oil-cooled motor cooling oil pump according to some embodiments of the present disclosure. As shown in FIG7 , the control device 700 includes an acquisition module 710, an operating condition determination module 720, a temperature determination module 730, a flow determination module 740, and a speed determination module 750.

[0105] An acquisition module 710 is used to acquire the current loss heat power of the motor;

[0106] An operating condition determination module 720 is configured to determine the current operating condition of the vehicle according to the power range in which the lost heat power is located. The operating conditions include a first operating condition, a second operating condition, and a third operating condition.

[0107] The temperature determination module 730 is used to determine the target temperature of the lubricating oil according to the current operating conditions of the vehicle;

[0108] The flow determination module 740 is used to determine the target flow of the oil pump based on the current operating conditions of the vehicle, the current heat loss power of the motor, and the target temperature of the lubricating oil;

[0109] The speed determination module 750 is configured to determine a target speed of the oil pump according to a target flow rate of the oil pump.

[0110] In some embodiments, the operating condition determination module 720 is further configured to:

[0111] When the heat loss power is less than or equal to the first power threshold, the heat loss power is in the first power range, and the current operating condition of the vehicle is determined to be the first operating condition;

[0112] When the heat loss power is greater than the first power threshold and less than or equal to the second power threshold, the heat loss power is in the second power range, and the current operating condition of the vehicle is determined to be the second operating condition;

[0113] When the lost heat power is greater than the second power threshold, the lost heat power is in the third power range, and the current operating condition of the vehicle is determined to be the third operating condition.

[0114] In some embodiments, the temperature determination module 730 is further configured to:

[0115] When the vehicle's current operating condition is the first operating condition, the lubricating oil target temperature is determined to be the first target oil temperature; when the vehicle's current operating condition is the second operating condition, the lubricating oil target temperature is determined to be the second target oil temperature; when the vehicle's current operating condition is the third operating condition, the lubricating oil target temperature is determined to be the third target oil temperature; wherein, the first target oil temperature is greater than the ideal lubricating oil temperature, the second target oil temperature is equal to the ideal lubricating oil temperature, and the third target oil temperature is less than the ideal lubricating oil temperature.

[0116] In some embodiments, the flow determination module 740 is further configured to:

[0117] When the vehicle's current operating condition is the first operating condition or the second operating condition, the target flow rate of the oil pump is calculated according to the following formula: q=(k*P 损耗 ) / [ρ 润滑油 (T 油入口 '-T 油出口 )]; T 油出口 =T 水出口 ; T 水出口 =[(k*P 损耗 ) / (ρ 冷却水 *q 冷却水 )]+T 水入口 ;

[0118] Among them, q represents the target flow rate of the oil pump, P 损耗 Indicates the current loss of heat power of the motor, k represents the safety factor, k is a constant greater than 1, ρ 润滑油 Indicates the density of lubricating oil, T 油入口 '、T 油出口 、T 水出口 、T 水入口 They represent the oil inlet target temperature, oil outlet temperature, water outlet temperature and water inlet temperature of the heat exchanger respectively. The oil inlet target temperature T 油入口 ' is equal to the target temperature of the lubricating oil, ρ 冷却水 represents the density of cooling water, q 冷却水 Indicates the cooling water flow rate.

[0119] In some embodiments, the control device 700 further includes an oil pump speed control module for:

[0120] When the current operating condition of the vehicle is the first operating condition or the second operating condition, obtaining an allowable oil pump speed threshold value of the vehicle under noise, vibration and harshness;

[0121] Compare the oil pump target speed with the oil pump speed threshold;

[0122] When the oil pump target speed is less than or equal to the oil pump speed threshold, the oil pump is controlled to operate at the oil pump target speed; when the oil pump target speed is greater than the oil pump speed threshold, the theoretical oil inlet temperature of the heat exchanger is determined under the oil pump speed threshold;

[0123] According to the theoretical oil inlet temperature of the heat exchanger, the oil pump is controlled to operate at the target oil pump speed, or to operate at a reduced oil pump speed threshold.

[0124] In some embodiments, the oil pump speed control module is further configured to:

[0125] Obtaining an external characteristic flow curve of the oil pump, which is a curve showing the relationship between the temperature of the lubricating oil pumped out by the oil pump and the speed of the oil pump;

[0126] Estimate the theoretical temperature of the lubricating oil pumped out by the oil pump through the oil temperature estimation method;

[0127] According to the external characteristic flow curve, determine the theoretical speed of the oil pump corresponding to the theoretical temperature of the lubricating oil;

[0128] When the oil pump target speed is less than or equal to the oil pump theoretical speed, the oil pump is controlled to run at the oil pump target speed;

[0129] When the oil pump target speed is greater than the oil pump theoretical speed, the oil pump is controlled to run at the oil pump theoretical speed.

[0130] In some embodiments, the oil pump speed control module is further configured to:

[0131] During the operation of the oil pump, if the motor stator temperature or lubricating oil temperature is abnormal, the oil pump is controlled to run at the theoretical speed of the oil pump.

[0132] It can be understood that the control device provided in the above embodiment is only illustrated by the division of the above functional modules. In actual applications, the above functions can be distributed and completed by different functional modules as needed, that is, the internal structure of the control device can be divided into different functional modules to complete all or part of the functions described above.

[0133] An embodiment of the present disclosure further provides an electronic device, which may include a processor and a memory, wherein the processor and the memory may be communicatively connected to each other via a bus or other means.

[0134] The processor may be a central processing unit (CPU) or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0135] The memory may include a large capacity memory for data or instructions. By way of example and not limitation, the memory may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these. Where appropriate, the memory may include removable or non-removable (or fixed) media. Where appropriate, the memory may be internal or external to the electronic device. In certain embodiments, the memory may be a non-volatile solid-state memory.

[0136] In one embodiment, the memory may be a read-only memory (ROM). In one embodiment, the ROM may be a mask-programmable ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or a flash memory, or a combination of two or more of these.

[0137] The processor implements any one of the control methods in the above embodiments by reading and executing computer program instructions stored in the memory.

[0138] In one example, the electronic device may further include a communication interface and a bus. The processor, memory, and communication interface are connected via the bus and communicate with each other. The communication interface is primarily used to enable communication between the various modules, devices, units, and / or devices in the embodiments of this application. Where appropriate, the bus may include one or more buses.

[0139] In addition, in conjunction with the control methods in the above embodiments, embodiments of the present disclosure may provide a computer-readable storage medium for implementation. The computer-readable storage medium stores computer instructions that, when executed by a computer, cause the computer to implement any of the control methods in the above embodiments.

[0140] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0141] According to the control method, device, equipment and medium of the oil-cooled motor cooling oil pump of some embodiments of the present disclosure, the current operating condition of the vehicle is determined by obtaining the power range where the current loss heat power of the motor is located. After the current operating condition of the vehicle is determined, the target flow of the oil pump can be determined by determining the target temperature of the lubricating oil corresponding to the operating condition, and then combining the loss heat power under the operating condition, thereby determining the target speed of the oil pump corresponding to the operating condition. The use of this control method can achieve precise control of the oil pump speed under the lubricating oil temperature control target, meet the heat dissipation requirements of the motor, and ensure that the motor as a whole operates in a high-efficiency state. At the same time, the operating condition is determined based on the power range where the loss heat power is located. Only when the power range where the loss heat power is located changes, the vehicle operating condition will change accordingly, and it is necessary to control the change in the oil pump speed. The control process is simpler, and there is no need to frequently adjust the oil pump speed, thereby ensuring the service life of the oil pump.

[0142] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present disclosure may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0143] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present disclosure, various features of the present disclosure are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed approach should not be interpreted as reflecting an intention that the claimed disclosure requires more features than are expressly recited in each claim. Rather, as reflected in the claims, inventive aspects lie in less than all the features of the individual embodiments previously disclosed. Accordingly, the claims that follow the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of the present disclosure.

[0144] It should be noted that the above embodiments illustrate rather than limit the present disclosure, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between brackets should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The present disclosure may be implemented by means of hardware comprising several different components and by means of appropriately programmed computers. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

Claims

1. A method for controlling a cooling oil pump of an oil-cooled motor, comprising: Get the current loss and heat power of the motor; Determining the current operating condition of the vehicle according to the power range in which the lost heat power is located, where different power ranges correspond to different operating conditions; Determining a lubricating oil target temperature according to the current operating condition of the vehicle; Determining a target flow rate of the oil pump according to the current operating condition of the vehicle, the current loss heat power of the motor and the target temperature of the lubricating oil; as well as The target speed of the oil pump is determined according to the target flow rate of the oil pump.

2. The control method according to claim 1, wherein: Determining the current operating condition of the vehicle according to the power range where the lost heat power is located includes: When the lost heat power is less than or equal to the first power threshold, the lost heat power is in the first power range, and the current operating condition of the vehicle is determined to be the first operating condition; When the lost heat power is greater than the first power threshold and less than or equal to the second power threshold, the lost heat power is in the second power range, and the current operating condition of the vehicle is determined to be the second operating condition; When the lost heat power is greater than the second power threshold, the lost heat power is in a third power interval, and the current operating condition of the vehicle is determined to be the third operating condition.

3. The control method according to claim 2, wherein: Determining the lubricating oil target temperature according to the current operating condition of the vehicle includes: When the current operating condition of the vehicle is the first operating condition, determining the lubricating oil target temperature to be a first target oil temperature; When the current operating condition of the vehicle is the second operating condition, determining the lubricating oil target temperature to be a second target oil temperature; When the current operating condition of the vehicle is the third operating condition, determining the lubricating oil target temperature to be a third target oil temperature; The first target oil temperature is greater than the ideal lubricating oil temperature, the second target oil temperature is equal to the ideal lubricating oil temperature, and the third target oil temperature is less than the ideal lubricating oil temperature.

4. The control method according to claim 2, wherein: The step of determining the target flow rate of the oil pump according to the current operating condition of the vehicle, the current heat loss power of the motor and the target temperature of the lubricating oil includes: When the current operating condition of the vehicle is the first operating condition or the second operating condition, the oil pump target flow rate is calculated according to the following formula: q=(k*P 损耗 ) / [ρ 润滑油 (T 油入口 '-T 油出口 )]; T 油出口 =T 水出口 ; T 水出口 =[(k*P 损耗 ) / (ρ 冷却水 *q 冷却水 )]+T 水入口 ; Wherein, q represents the target flow rate of the oil pump, P 损耗 represents the current loss of heat power of the motor, k represents the safety factor, k is a constant greater than 1, ρ 润滑油 Indicates the density of lubricating oil, T 油入口 '、T 油出口 、T 水出口 、T 水入口 represent the oil inlet target temperature, oil outlet temperature, water outlet temperature and water inlet temperature of the heat exchanger respectively. The oil inlet target temperature T 油入口 ' is equal to the lubricating oil target temperature, ρ 冷却水 represents the density of cooling water, q 冷却水 Indicates the cooling water flow rate.

5. The control method according to claim 2, wherein: After determining the target speed of the oil pump, the control method further includes: When the current operating condition of the vehicle is the first operating condition or the second operating condition, obtaining an oil pump speed threshold allowed by the vehicle under noise, vibration and harshness; comparing the oil pump target speed with the oil pump speed threshold; When the oil pump target speed is less than or equal to the oil pump speed threshold, controlling the oil pump to operate at the oil pump target speed; and When the oil pump target speed is greater than the oil pump speed threshold, the theoretical oil inlet temperature of the heat exchanger is determined under the oil pump speed threshold, and based on the theoretical oil inlet temperature of the heat exchanger, the oil pump is controlled to operate at the oil pump target speed, or to operate at a reduced rate at the oil pump speed threshold.

6. The control method according to claim 1, further comprising: Obtaining an external characteristic flow curve of the oil pump, wherein the external characteristic flow curve of the oil pump is a curve of the relationship between the temperature of the lubricating oil pumped out by the oil pump and the maximum speed of the oil pump; estimating the theoretical temperature of the lubricating oil pumped out by the oil pump by using an oil temperature estimation method; Determining the theoretical speed of the oil pump corresponding to the theoretical temperature of the lubricating oil according to the external characteristic flow curve; When the oil pump target speed is less than or equal to the oil pump theoretical speed, controlling the oil pump to operate at the oil pump target speed; as well as When the oil pump target speed is greater than the oil pump theoretical speed, the oil pump is controlled to operate at the oil pump theoretical speed.

7. The control method according to claim 6, further comprising: During the operation of the oil pump, if the temperature of the motor stator or the temperature of the lubricating oil is abnormal, the oil pump is controlled to operate at the theoretical speed of the oil pump.

8. A control device for a cooling oil pump of an oil-cooled motor, comprising: An acquisition module is used to obtain the current loss and heating power of the motor; A working condition determination module, used to determine the current working condition of the vehicle according to the power range in which the lost heat power is located, and different power ranges correspond to different working conditions; A temperature determination module, used to determine a target temperature of the lubricating oil according to the current operating condition of the vehicle; The flow determination module is used to determine the current operating conditions of the vehicle and the current loss of the motor. The target flow rate of the oil pump is determined based on the heat consumption and the target temperature of the lubricating oil; as well as The speed determination module is used to determine the target speed of the oil pump according to the target flow rate of the oil pump.

9. An electronic device, comprising: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the control method according to any one of claims 1 to 7 by executing the computer instructions.

10. A computer-readable storage medium, comprising computer instructions stored thereon, wherein when the computer instructions are executed by the computer, the computer is prompted to implement the control method according to any one of claims 1 to 7.

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