CN116163942A - Control method and device for electric oil pump of electric automobile oil-cooled power assembly - Google Patents
Control method and device for electric oil pump of electric automobile oil-cooled power assembly Download PDFInfo
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- CN116163942A CN116163942A CN202310142769.6A CN202310142769A CN116163942A CN 116163942 A CN116163942 A CN 116163942A CN 202310142769 A CN202310142769 A CN 202310142769A CN 116163942 A CN116163942 A CN 116163942A
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000004590 computer program Methods 0.000 claims description 16
- 239000002826 coolant Substances 0.000 claims description 12
- 238000012360 testing method Methods 0.000 description 6
- 230000017525 heat dissipation Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
Abstract
The invention provides a control method and a device of an electric oil pump of an electric automobile oil-cooled power assembly, wherein the method comprises the following steps: generating ambient oil temperature based on the pre-estimated strategy; judging whether the ambient oil temperature meets a working oil temperature threshold value or not; in the case where the ambient oil temperature satisfies the operating oil temperature threshold value, the electric oil pump is controlled to execute the corresponding rotation speed. The whole vehicle controller adopts an electric oil pump ambient oil temperature estimation strategy to replace a sensor hardware acquisition circuit, so that the hardware cost of the power assembly is reduced. Furthermore, the method provided by the invention can fully utilize the temperature working range of the electric oil pump, ensure the normal operation and heat exchange of the power assembly system under the condition of avoiding damage to the electric oil pump as much as possible, and realize continuous and stable operation of the oil-cooled power assembly under more severe working conditions.
Description
Technical Field
The invention relates to the field of vehicle design, in particular to a control method and a control device of an electric oil pump of an electric automobile oil-cooled power assembly.
Background
At present, the power assembly of the electric automobile generally adopts oil cooling, an oil pump motor controller is integrated in an electric oil pump system, the oil pump motor controller firstly obtains the ambient oil temperature of the electric oil pump through a heat-sensitive sensor, then judges whether the ambient oil temperature meets the temperature threshold range of normal operation of the electric oil pump, if so, controls the electric oil pump to continuously and stably supply oil liquid as a cooling medium to a hybrid gearbox, and if not, controls the electric oil pump to cut off power and stop operation. However, the existing control method of the oil pump has the following drawbacks:
1. the external thermistor of the electric oil pump controller is required to collect the ambient oil temperature of the oil pump, so that the material cost and the production process cost of the electric oil pump are increased;
2. when the ambient oil temperature of the oil pump does not meet the temperature threshold range of normal operation of the electric oil pump, the electric oil pump is controlled to be powered off, and the operation is stopped. This strategy may cause the electric oil pump to be inoperative in the extreme environment of the vehicle, may cause the vehicle to be unable to drive normally, and may cause customer complaints.
In view of the above, the present invention has been made to solve, at least in part, the technical problems occurring in the prior art.
Disclosure of Invention
The control method aims at the technical problems that the existing control method of the electric oil pump needs an externally-attached thermistor to collect the ambient oil temperature of the oil pump, the electric oil pump can only operate in a normal working temperature threshold range, and the like.
According to a first aspect of the present invention, there is provided a control method of an electric oil pump of an electric vehicle oil-cooled power assembly, the method comprising:
generating ambient oil temperature based on the pre-estimated strategy; judging whether the ambient oil temperature meets a working oil temperature threshold value or not; in the case where the ambient oil temperature satisfies the operating oil temperature threshold value, the electric oil pump is controlled to execute the corresponding rotation speed.
Preferably, generating the ambient oil temperature based on the pre-estimated strategy includes: acquiring the rotating speed of the electric oil pump and the working current of the electric oil pump; and obtaining the ambient oil temperature based on the rotating speed and the working current.
Preferably, the operating oil temperature threshold includes a low temperature threshold for derating operation of the electric oil pump, a normal operating oil temperature threshold, and a high temperature threshold for derating operation, the normal operating oil temperature threshold being higher than the low temperature threshold and lower than the high temperature threshold;
in the case where the ambient oil temperature satisfies the operating oil temperature threshold, controlling the electric oil pump to execute the corresponding rotation speed includes: under the condition that the ambient oil temperature meets a low-temperature threshold value of derating work, controlling the electric oil pump to periodically execute a first target rotating speed, and simultaneously limiting the torque and the vehicle speed of a power system so as to ensure the driving safety of the vehicle and avoid over-temperature faults of a power assembly; or under the condition that the ambient oil temperature meets the high-temperature threshold of derating work, controlling the electric oil pump to periodically execute the second target rotating speed, and simultaneously, performing zero torque control on the power assembly to prevent further temperature rise so as to ensure driving safety and avoid damaging the power assembly; or controlling the electric oil pump to execute corresponding rotating speed under the condition that the ambient oil temperature meets the normal working oil temperature threshold value.
Preferably, the normal operating oil temperature threshold includes a first temperature node and a second temperature node, and the first temperature node is lower than the second temperature node;
in the case where the ambient oil temperature satisfies the operating oil temperature threshold, controlling the electric oil pump to execute the first corresponding rotational speed includes: controlling the electric oil pump to execute a third target rotating speed under the condition that the ambient oil temperature is lower than the first temperature node; or controlling the electric oil pump to execute the fourth target rotating speed under the condition that the ambient oil temperature is higher than the second temperature node; or controlling the electric oil pump to execute the fifth target rotation speed in the case that the ambient oil temperature is higher than the first temperature node and lower than the second temperature node.
Preferably, in a case where the ambient oil temperature is lower than the first temperature node, controlling the electric oil pump to execute the third target rotation speed includes: acquiring a third target rotating speed calibrated based on the flow demand of the power system on the cooling medium; the electric oil pump is controlled to execute the third target rotation speed.
Preferably, in a case where the ambient oil temperature is higher than the second temperature node, controlling the electric oil pump to execute the fourth target rotation speed includes: obtaining a fourth target rotating speed calibrated in advance, wherein the fourth target rotating speed is the highest rotating speed of the electric oil pump; the electric oil pump is controlled to execute the fourth target rotation speed.
Preferably, in a case where the ambient oil temperature is higher than the first temperature node and lower than the second temperature node, controlling the electric oil pump to execute the fifth target rotation speed includes: acquiring a fifth target rotating speed calibrated in real time based on the ambient oil temperature; the electric oil pump is controlled to execute the fifth target rotation speed.
Preferably, in a case where the ambient oil temperature satisfies a low temperature threshold for the derating operation, the controlling the electric oil pump to periodically perform the first target rotation speed includes: acquiring a first target rotating speed calibrated in advance; the electric oil pump is controlled to periodically perform the first target rotation speed.
Preferably, in a case where the ambient oil temperature satisfies a high temperature threshold for the derating operation, the controlling the electric oil pump to periodically perform the second target rotation speed includes: obtaining a second target rotating speed calibrated in advance; the electric oil pump is controlled to periodically perform the second target rotation speed.
According to a second aspect of the present invention, there is provided a vehicle controller of an electric oil pump of an electric vehicle oil-cooled power assembly, the vehicle controller comprising:
the estimating module is used for generating the ambient oil temperature based on an estimating strategy;
the judging module is used for judging whether the ambient oil temperature meets a working oil temperature threshold value or not;
and the control module is used for controlling the electric oil pump to execute corresponding rotating speed under the condition that the ambient oil temperature meets the working oil temperature threshold value.
Preferably, the estimating module is configured to:
acquiring the rotating speed of the electric oil pump and the working current of the electric oil pump; and obtaining the ambient oil temperature based on the rotating speed and the working current.
Preferably, the operating oil temperature threshold includes a low temperature threshold for derating operation of the electric oil pump, a normal operating oil temperature threshold, and a high temperature threshold for derating operation, the normal operating oil temperature threshold being higher than the low temperature threshold and lower than the high temperature threshold;
a control module for: under the condition that the ambient oil temperature meets a low-temperature threshold value of derating work, controlling the electric oil pump to periodically execute a first target rotating speed, and simultaneously limiting the torque and the vehicle speed of a power system so as to ensure the driving safety of the vehicle and avoid over-temperature faults of a power assembly; or under the condition that the ambient oil temperature meets the high-temperature threshold of derating work, controlling the electric oil pump to periodically execute the second target rotating speed, and simultaneously, performing zero torque control on the power assembly to prevent further temperature rise so as to ensure driving safety and avoid damaging the power assembly; or controlling the electric oil pump to execute corresponding rotating speed under the condition that the ambient oil temperature meets the normal working oil temperature threshold value.
Preferably, the normal operating oil temperature threshold includes a first temperature node and a second temperature node, and the first temperature node is lower than the second temperature node;
a control module for: controlling the electric oil pump to execute a third target rotating speed under the condition that the ambient oil temperature is lower than the first temperature node; or controlling the electric oil pump to execute the fourth target rotating speed under the condition that the ambient oil temperature is higher than the second temperature node; or controlling the electric oil pump to execute the fifth target rotation speed in the case that the ambient oil temperature is higher than the first temperature node and lower than the second temperature node.
Preferably, the control module is configured to: acquiring a third target rotating speed calibrated based on the flow demand of the power system on the cooling medium; the electric oil pump is controlled to execute the third target rotation speed.
Preferably, the control module is configured to: obtaining a fourth target rotating speed calibrated in advance, wherein the fourth target rotating speed is the highest rotating speed of the electric oil pump; the electric oil pump is controlled to execute the fourth target rotation speed.
Preferably, the control module is configured to: acquiring a fifth target rotating speed calibrated in real time based on the ambient oil temperature; the electric oil pump is controlled to execute the fifth target rotation speed.
Preferably, the control module is configured to: acquiring a first target rotating speed calibrated in advance; the electric oil pump is controlled to periodically perform the first target rotation speed.
Preferably, the control module is configured to: obtaining a second target rotating speed calibrated in advance; the electric oil pump is controlled to periodically perform the second target rotation speed.
According to a third aspect of the present invention, there is provided an electronic device comprising: a processor and a memory storing computer program instructions; the control method of the electric oil pump of the electric automobile oil-cooled power assembly is realized when the processor executes the computer program instructions.
According to a fourth aspect of the present invention, there is provided a computer-readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the above-described control method of an electric oil pump of an electric vehicle oil-cooled power assembly.
In summary, the present invention provides a method for controlling an electric oil pump of an electric vehicle oil-cooled power assembly, the method comprising: generating ambient oil temperature based on the pre-estimated strategy; judging whether the ambient oil temperature meets a working oil temperature threshold value or not; in the case where the ambient oil temperature satisfies the operating oil temperature threshold value, the electric oil pump is controlled to execute the corresponding rotation speed. The whole vehicle controller adopts an electric oil pump ambient oil temperature estimation strategy to replace a sensor hardware acquisition circuit, so that the hardware cost of the power assembly is reduced. Furthermore, the method provided by the invention can fully utilize the temperature working range of the electric oil pump, ensure the normal operation and heat exchange of the power assembly system under the condition of avoiding damage to the electric oil pump as much as possible, and realize continuous and stable operation of the oil-cooled power assembly under more severe working conditions.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a control method of an electric oil pump of an electric vehicle oil-cooled power assembly according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of an electric oil pump of an electric vehicle oil-cooled power assembly according to an embodiment of the present invention;
FIG. 3 is a diagram of the components and control modules included in a control object of an embodiment of the present invention;
fig. 4 is a block diagram of a control device of an electric oil pump of an electric vehicle oil-cooled power assembly according to an embodiment of the present invention;
fig. 5 is a block diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
To further clarify the above and other features and advantages of the present invention, a further description of the invention will be rendered by reference to the appended drawings. It should be understood that the specific embodiments presented herein are for purposes of explanation to those skilled in the art and are intended to be illustrative only and not limiting.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the specific details need not be employed to practice the present invention. In other instances, well-known steps or operations have not been described in detail in order to avoid obscuring the invention.
The control method aims at the technical problems that the existing control method of the electric oil pump needs an externally-attached thermistor to collect the ambient oil temperature of the oil pump, the electric oil pump can only operate in a normal working temperature threshold range, and the like.
Referring to fig. 1, the present invention provides a control method of an electric oil pump of an electric vehicle oil-cooled power assembly, the method comprising:
s110, generating the ambient oil temperature based on the estimated strategy.
Compared with the oil pump motor controller in the prior art, the whole vehicle controller has stronger storage capacity, higher operation capacity and running stability, so that the environment oil temperature can be conveniently generated based on the pre-estimation strategy. The whole vehicle controller can acquire the rotating speed of the electric oil pump and the working current of the electric oil pump; the ambient oil temperature may be derived based on the rotational speed and the operating current.
Specifically, the whole vehicle controller is provided with an ambient oil temperature estimation strategy, different electric oil pump rotating speeds correspond to different electric oil pump working currents under different ambient oil temperatures according to test measurement, multi-working-condition test calibration is carried out on the basis of test data, and reliability of a temperature estimation algorithm is improved. Therefore, after the power assembly is loaded with the whole vehicle thermal management system, the current environment temperature can be estimated according to the table lookup of the actual rotating speed of the electric oil pump and the actual working current of the electric oil pump.
S120, judging whether the ambient oil temperature meets the working oil temperature threshold value.
And S130, controlling the electric oil pump to execute corresponding rotating speed under the condition that the ambient oil temperature meets the working oil temperature threshold value.
Referring to fig. 2 and 3, in fig. 3, EOP: the electric oil pump realizes oil pump rotation speed control, oil pump temperature acquisition, fault diagnosis and the like; VCU: the whole vehicle controller is used for realizing motor torque control, oil temperature estimation and EOP control; MCU: and the motor controller is used for realizing motor torque control and stator temperature feedback. Specifically, after the vehicle controller generates the ambient oil temperature based on the pre-estimation strategy, it may be determined whether the ambient oil temperature meets the working oil temperature threshold, and under the condition that the ambient oil temperature meets the working oil temperature threshold, the electric oil pump is controlled to execute the corresponding rotation speed. The working oil temperature threshold comprises a low temperature threshold of derating work of the electric oil pump, a normal working oil temperature threshold and a high temperature threshold of derating work, and the normal working oil temperature threshold is higher than the low temperature threshold and lower than the high temperature threshold.
Under the condition that the ambient oil temperature meets a low-temperature threshold value of derating work, controlling the electric oil pump to periodically execute a first target rotating speed calibrated in advance, and simultaneously limiting the torque of a power system and the speed of the vehicle so as to ensure the driving safety of the vehicle and the failure of the power assembly in excess temperature; or under the condition that the ambient oil temperature meets the high-temperature threshold of derating work, controlling the electric oil pump to periodically execute the second target rotating speed calibrated in advance, and simultaneously, performing zero torque control on the power assembly to prevent further temperature rise so as to ensure driving safety and avoid damaging the power assembly.
Further, the normal operating oil temperature threshold includes a first temperature node and a second temperature node, and the first temperature node is lower than the second temperature node; under the condition that the ambient oil temperature is lower than the first temperature node, controlling the electric oil pump to execute the calibration of a third target rotating speed based on the flow demand of the power system on the cooling medium; or in the case where the ambient oil temperature is higher than the second temperature node, controlling the electric oil pump to perform a fourth target rotation speed (the highest rotation speed of the electric oil pump); or under the condition that the ambient oil temperature is higher than the first temperature node and lower than the second temperature node, controlling the electric oil pump to execute the fifth target rotating speed calibrated in real time based on the ambient oil temperature.
And controlling the electric oil pump to stop working under the condition that the ambient oil temperature exceeds the working oil temperature threshold value.
In some embodiments, the normal operating ambient oil temperature range of the electric oil pump is-30 ℃ to 120 ℃, and when the vehicle controller estimates that the ambient oil temperature is-30 ℃ to 120 ℃, the rotational speed control strategy of the electric oil pump is as follows: a first temperature node A and a second temperature node B within a normal operating range of ambient oil temperature are set, wherein A is less than B. When the ambient oil temperature is between-30 ℃ and A ℃ (A > -30), the oil way resistance is larger at low temperature, so that the target rotating speed of the electric oil pump is required to be calibrated according to the flow requirement of the power system on the cooling medium in order to ensure the flow requirement of the power system; when the estimated ambient oil temperature of the whole vehicle controller is between A and B ℃ (B is more than A and B is less than 120), determining the target rotating speed of the electric oil pump through real vehicle calibration; when the estimated ambient oil temperature of the whole vehicle controller is between B and 120 ℃, the target rotating speed of the electric oil pump is required to be set to be the highest rotating speed, and the heat dissipation of the power assembly system is ensured.
When the whole vehicle controller predicts that the ambient oil temperature is less than-30 ℃ and is > -40 ℃ (the lowest value of the deratable work of the oil pump controller), the whole vehicle controller periodically sends a small target rotating speed to the electric oil pump (the period and the target rotating speed need to avoid the electric water pump to trigger the locked-rotor fault and the over-temperature fault), so that the electric oil pump body heats and heats up through driving the electric oil pump with small current, and meanwhile, the whole vehicle controller needs to limit the driving torque and the rotating speed range of a motor system, so that the vehicle can be driven at a low speed under an extremely low temperature environment, the power assembly can be heated through working and heating to a cooling medium, and the cooling system of the power assembly is gradually restored to a normal working temperature (the whole vehicle controller needs to ensure the driving safety of the vehicle and the over-temperature fault of the power assembly due to the torque limitation and the speed limitation of the whole vehicle).
When the estimated ambient oil temperature of the whole vehicle controller is more than 120 ℃ and less than 145 ℃ (the highest temperature value of the derating work of the oil pump), the whole vehicle controller periodically sends target rotating speed to the electric oil pump (the cycle time and the target rotating speed are calibrated in advance through a rack), so that the basic heat dissipation function of the power assembly is realized, and meanwhile, the over-temperature shutdown fault triggered by the electric oil pump is avoided. Under the working condition of coolant over-temperature, the whole vehicle controller needs to carry out zero torque control on the power assembly, so as to prevent the system from further heating, ensure driving safety and avoid damaging the power assembly.
And when the whole vehicle controller predicts that the ambient oil temperature is not in the above temperature range, controlling the electric oil pump to stop working.
In summary, the method provided by the present invention,
the environment oil temperature estimation strategy and calibration are adopted to replace an environment oil temperature sensor and related hardware circuits, so that hardware interface resources of a controller are saved, and the manufacturing cost of the power assembly is reduced.
When the current estimated ambient oil temperature is in an abnormal working range of the electric oil pump, the vehicle controller periodically sends a rotating speed instruction (the period and the rotating speed instruction are obtained according to the calibration of the rack) to the electric oil pump, and particularly when the ambient oil temperature exceeds the normal working threshold range of the electric oil pump, the vehicle controller needs to distinguish whether the ambient oil temperature is too high or too low. When the ambient oil temperature is too low, the whole vehicle controller can control the driving motor to run in a low-speed low-torque area, heat the motor and mechanically stir to lift the oil temperature, and simultaneously control the electric oil pump to periodically rotate at a low speed (without triggering the locked-rotor protection function), so that the temperature of the electric oil pump body is raised to a normal working temperature range; when the ambient oil temperature is too high, the whole vehicle controller performs zero torque control on the driving system, and the oil pump needs to be controlled to periodically rotate at a low speed, so that the power system is ensured to radiate heat and the electric oil pump is not damaged. The purpose of avoiding the failure of the electric oil pump and expanding the working temperature range of the power assembly is achieved.
Referring to fig. 4, the present invention provides a vehicle controller of an electric oil pump of an oil-cooled power assembly of an electric vehicle, the vehicle controller comprising:
the estimation module 401 is configured to generate the ambient oil temperature based on the estimation policy.
Compared with the oil pump motor controller in the prior art, the whole vehicle controller has stronger storage capacity, higher operation capacity and running stability, so that the environment oil temperature can be conveniently generated based on the pre-estimation strategy. The whole vehicle controller can acquire the rotating speed of the electric oil pump and the working current of the electric oil pump; the ambient oil temperature may be derived based on the rotational speed and the operating current.
Specifically, the whole vehicle controller is provided with an ambient oil temperature estimation strategy, different electric oil pump rotating speeds correspond to different electric oil pump working currents under different ambient oil temperatures according to test measurement, multi-working-condition test calibration is carried out on the basis of test data, and reliability of a temperature estimation algorithm is improved. Therefore, after the power assembly is loaded with the whole vehicle thermal management system, the current environment temperature can be estimated according to the table lookup of the actual rotating speed of the electric oil pump and the actual working current of the electric oil pump.
A judging module 402, configured to judge whether the ambient oil temperature meets a working oil temperature threshold;
the control module 403 is configured to control the electric oil pump to execute a corresponding rotation speed if the ambient oil temperature meets the working oil temperature threshold.
Referring to fig. 2 and 3, in fig. 3, EOP: the electric oil pump realizes oil pump rotation speed control, oil pump temperature acquisition, fault diagnosis and the like; VCU: the whole vehicle controller is used for realizing motor torque control, oil temperature estimation and EOP control; MCU: and the motor controller is used for realizing motor torque control and stator temperature feedback. Specifically, after the vehicle controller generates the ambient oil temperature based on the pre-estimation strategy, it may be determined whether the ambient oil temperature meets the working oil temperature threshold, and under the condition that the ambient oil temperature meets the working oil temperature threshold, the electric oil pump is controlled to execute the corresponding rotation speed. The working oil temperature threshold comprises a low temperature threshold of derating work of the electric oil pump, a normal working oil temperature threshold and a high temperature threshold of derating work, and the normal working oil temperature threshold is higher than the low temperature threshold and lower than the high temperature threshold.
Under the condition that the ambient oil temperature meets a low-temperature threshold value of derating work, controlling the electric oil pump to periodically execute a first target rotating speed calibrated in advance, and simultaneously limiting the torque of a power system and the speed of the vehicle so as to ensure the driving safety of the vehicle and the failure of the power assembly in excess temperature; or under the condition that the ambient oil temperature meets the high-temperature threshold of derating work, controlling the electric oil pump to periodically execute the second target rotating speed calibrated in advance, and simultaneously, performing zero torque control on the power assembly to prevent further temperature rise so as to ensure driving safety and avoid damaging the power assembly.
Further, the normal operating oil temperature threshold includes a first temperature node and a second temperature node, and the first temperature node is lower than the second temperature node; under the condition that the ambient oil temperature is lower than the first temperature node, controlling the electric oil pump to execute the calibration of a third target rotating speed based on the flow demand of the power system on the cooling medium; or in the case where the ambient oil temperature is higher than the second temperature node, controlling the electric oil pump to perform a fourth target rotation speed (the highest rotation speed of the electric oil pump); or under the condition that the ambient oil temperature is higher than the first temperature node and lower than the second temperature node, controlling the electric oil pump to execute the fifth target rotating speed calibrated in real time based on the ambient oil temperature.
And controlling the electric oil pump to stop working under the condition that the ambient oil temperature exceeds the working oil temperature threshold value.
In some embodiments, the normal operating ambient oil temperature range of the electric oil pump is-30 ℃ to 120 ℃, and when the vehicle controller estimates that the ambient oil temperature is-30 ℃ to 120 ℃, the rotational speed control strategy of the electric oil pump is as follows: a first temperature node A and a second temperature node B within a normal operating range of ambient oil temperature are set, wherein A is less than B. When the ambient oil temperature is between-30 ℃ and A ℃ (A > -30), the oil way resistance is larger at low temperature, so that the target rotating speed of the electric oil pump is required to be calibrated according to the flow requirement of the power system on the cooling medium in order to ensure the flow requirement of the power system; when the estimated ambient oil temperature of the whole vehicle controller is between A and B ℃ (B is more than A and B is less than 120), determining the target rotating speed of the electric oil pump through real vehicle calibration; when the estimated ambient oil temperature of the whole vehicle controller is between B and 120 ℃, the target rotating speed of the electric oil pump is required to be set to be the highest rotating speed, and the heat dissipation of the power assembly system is ensured.
When the whole vehicle controller predicts that the ambient oil temperature is less than-30 ℃ and is > -40 ℃ (the lowest value of the deratable work of the oil pump controller), the whole vehicle controller periodically sends a small target rotating speed to the electric oil pump (the period and the target rotating speed need to avoid the electric water pump to trigger the locked-rotor fault and the over-temperature fault), so that the electric oil pump body heats and heats up through driving the electric oil pump with small current, and meanwhile, the whole vehicle controller needs to limit the driving torque and the rotating speed range of a motor system, so that the vehicle can be driven at a low speed under an extremely low temperature environment, the power assembly can be heated through working and heating to a cooling medium, and the cooling system of the power assembly is gradually restored to a normal working temperature (the whole vehicle controller needs to ensure the driving safety of the vehicle and the over-temperature fault of the power assembly due to the torque limitation and the speed limitation of the whole vehicle).
When the estimated ambient oil temperature of the whole vehicle controller is more than 120 ℃ and less than 145 ℃ (the highest temperature value of the derating work of the oil pump), the whole vehicle controller periodically sends target rotating speed to the electric oil pump (the cycle time and the target rotating speed are calibrated in advance through a rack), so that the basic heat dissipation function of the power assembly is realized, and meanwhile, the over-temperature shutdown fault triggered by the electric oil pump is avoided. Under the working condition of coolant over-temperature, the whole vehicle controller needs to carry out zero torque control on the power assembly, so as to prevent the system from further heating, ensure driving safety and avoid damaging the power assembly.
And when the whole vehicle controller predicts that the ambient oil temperature is not in the above temperature range, controlling the electric oil pump to stop working.
Referring to fig. 5, the present invention provides an electronic device 500, including: a processor 501 and a memory 502 storing computer program instructions;
the processor 501, when executing the computer program instructions, implements the above-described control method for the electric oil pump of the oil-cooled power assembly of the electric vehicle.
The invention provides a computer readable storage medium, wherein computer program instructions are stored on the computer readable storage medium, and when the computer program instructions are executed by a processor, the control method of the electric oil pump of the electric automobile oil-cooled power assembly is realized.
It is to be understood that the specific features, operations and details described herein before with respect to the method of the invention may also be similarly applied to the apparatus and system of the invention, or vice versa. In addition, each step of the method of the present invention described above may be performed by a corresponding component or unit of the apparatus or system of the present invention.
It is to be understood that the various modules/units of the apparatus of the invention may be implemented in whole or in part by software, hardware, firmware, or a combination thereof. Each module/unit may be embedded in the processor of the computer device in hardware or firmware form or independent of the processor, or may be stored in the memory of the computer device in software form for the processor to call to perform the operations of each module/unit. Each module/unit may be implemented as a separate component or module, or two or more modules/units may be implemented as a single component or module. In one embodiment, a computer device is provided that includes a memory and a processor, the memory having stored thereon computer instructions executable by the processor, the computer instructions, when executed by the processor, directing the processor to perform the steps of the method of the embodiments of the invention. The computer device may be broadly a server, a terminal, or any other electronic device having the necessary computing and/or processing capabilities. In one embodiment, the computer device may include a processor, memory, network interface, communication interface, etc. connected by a system bus. The processor of the computer device may be used to provide the necessary computing, processing and/or control capabilities. The memory of the computer device may include a non-volatile storage medium and an internal memory. The non-volatile storage medium may have an operating system, computer programs, etc. stored therein or thereon. The internal memory may provide an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface and communication interface of the computer device may be used to connect and communicate with external devices via a network. Which when executed by a processor performs the steps of the method of the invention.
The present invention may be implemented as a computer readable storage medium having stored thereon a computer program which, when executed by a processor, causes steps of a method of an embodiment of the present invention to be performed. In one embodiment, a computer program is distributed over a plurality of computer devices or processors coupled by a network such that the computer program is stored, accessed, and executed by one or more computer devices or processors in a distributed fashion. A single method step/operation, or two or more method steps/operations, may be performed by a single computer device or processor, or by two or more computer devices or processors. One or more method steps/operations may be performed by one or more computer devices or processors, and one or more other method steps/operations may be performed by one or more other computer devices or processors. One or more computer devices or processors may perform a single method step/operation or two or more method steps/operations.
Those of ordinary skill in the art will appreciate that the method steps of the present invention may be implemented by a computer program, which may be stored on a non-transitory computer readable storage medium, to instruct related hardware such as a computer device or a processor, which when executed causes the steps of the present invention to be performed. Any reference herein to memory, storage, database, or other medium may include non-volatile and/or volatile memory, as the case may be. Examples of nonvolatile memory include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), flash memory, magnetic tape, floppy disk, magneto-optical data storage, hard disk, solid state disk, and the like. Examples of volatile memory include Random Access Memory (RAM), external cache memory, and the like.
The technical features described above may be arbitrarily combined. Although not all possible combinations of features are described, any combination of features should be considered to be covered by the description provided that such combinations are not inconsistent.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (12)
1. A method for controlling an electric oil pump of an electric vehicle oil-cooled powertrain, the method comprising:
generating ambient oil temperature based on the pre-estimated strategy;
judging whether the ambient oil temperature meets a working oil temperature threshold value or not;
and controlling the electric oil pump to execute corresponding rotating speed under the condition that the ambient oil temperature meets the working oil temperature threshold value.
2. The method of controlling an electric oil pump of an electric vehicle oil-cooled powertrain according to claim 1, wherein the generating the ambient oil temperature based on the predictive strategy comprises:
acquiring the rotating speed of an electric oil pump and the working current of the electric oil pump;
and obtaining the ambient oil temperature based on the rotating speed and the working current.
3. The method for controlling an electric oil pump of an electric vehicle oil-cooled powertrain according to claim 1, characterized in that,
the working oil temperature threshold comprises a low temperature threshold for derating work of the electric oil pump, a normal working oil temperature threshold and a high temperature threshold for derating work, wherein the normal working oil temperature threshold is higher than the low temperature threshold and lower than the high temperature threshold;
and controlling the electric oil pump to execute corresponding rotating speed under the condition that the ambient oil temperature meets the working oil temperature threshold value, wherein the method comprises the following steps:
under the condition that the ambient oil temperature meets the low-temperature threshold value of the derating work, controlling the electric oil pump to periodically execute a first target rotating speed, and simultaneously limiting the torque of a power system and the speed of the vehicle so as to ensure the driving safety of the vehicle and avoid over-temperature faults of a power assembly; or alternatively
Under the condition that the ambient oil temperature meets the high-temperature threshold of the derating work, controlling the electric oil pump to periodically execute a second target rotating speed, and simultaneously, performing zero torque control on the power assembly to prevent further temperature rise so as to ensure driving safety and avoid damaging the power assembly; or alternatively
And under the condition that the ambient oil temperature meets the normal working oil temperature threshold value, controlling the electric oil pump to execute corresponding rotating speed.
4. The method for controlling an electric oil pump of an electric vehicle oil-cooled power assembly according to claim 3, characterized in that,
the normal operating oil temperature threshold comprises a first temperature node and a second temperature node, and the first temperature node is lower than the second temperature node;
controlling the electric oil pump to execute a first corresponding rotational speed in the case where the ambient oil temperature satisfies the operating oil temperature threshold, including:
controlling the electric oil pump to execute a third target rotating speed under the condition that the ambient oil temperature is lower than the first temperature node; or alternatively
Controlling the electric oil pump to execute a fourth target rotating speed under the condition that the ambient oil temperature is higher than the second temperature node; or alternatively
And controlling the electric oil pump to execute a fifth target rotating speed under the condition that the ambient oil temperature is higher than the first temperature node and lower than the second temperature node.
5. The method of controlling an electric oil pump of an electric vehicle oil-cooled powertrain according to claim 4, wherein controlling the electric oil pump to perform a third target rotational speed in a case where the ambient oil temperature is lower than the first temperature node, comprises:
acquiring a third target rotating speed calibrated based on the flow demand of the power system on the cooling medium;
the electric oil pump is controlled to execute the third target rotation speed.
6. The control method of an electric oil pump of an electric vehicle oil-cooled powertrain according to claim 4, wherein controlling the electric oil pump to perform a fourth target rotational speed in a case where the ambient oil temperature is higher than the second temperature node, comprises:
obtaining a fourth target rotating speed calibrated in advance, wherein the fourth target rotating speed is the highest rotating speed of the electric oil pump;
the electric oil pump is controlled to execute the fourth target rotation speed.
7. The control method of an electric oil pump of an electric vehicle oil-cooled powertrain according to claim 4, wherein controlling the electric oil pump to execute a fifth target rotation speed in a case where the ambient oil temperature is higher than the first temperature node and lower than the second temperature node, includes:
acquiring a fifth target rotating speed calibrated in real time based on the ambient oil temperature;
the electric oil pump is controlled to execute the fifth target rotation speed.
8. The control method of an electric oil pump of an electric vehicle oil-cooled powertrain according to claim 3, characterized in that, in a case where the ambient oil temperature satisfies a low temperature threshold of the derating operation, controlling the electric oil pump to periodically perform a first target rotation speed includes:
acquiring a first target rotating speed calibrated in advance;
the electric oil pump is controlled to periodically perform the first target rotation speed.
9. The control method of an electric oil pump of an electric vehicle oil-cooled powertrain according to claim 3, characterized in that, in a case where the ambient oil temperature satisfies a high temperature threshold of the derating operation, controlling the electric oil pump to periodically perform a second target rotation speed includes:
obtaining a second target rotating speed calibrated in advance;
the electric oil pump is controlled to periodically perform the second target rotation speed.
10. The utility model provides a whole car controller of electric automobile oil-cooled power assembly electric oil pump which characterized in that, whole car controller includes:
the estimating module is used for generating the ambient oil temperature based on an estimating strategy;
the judging module is used for judging whether the ambient oil temperature meets a working oil temperature threshold value or not;
and the control module is used for controlling the electric oil pump to execute corresponding rotating speed under the condition that the ambient oil temperature meets the working oil temperature threshold value.
11. An electronic device, the electronic device comprising: a processor and a memory storing computer program instructions;
the processor, when executing the computer program instructions, implements the method for controlling an electric oil pump of an electric vehicle oil-cooled powertrain according to any one of claims 1-9.
12. A computer-readable storage medium, wherein computer program instructions are stored on the computer-readable storage medium, which when executed by a processor, implement the method of controlling an electric oil pump of an electric vehicle oil-cooled powertrain according to any one of claims 1 to 9.
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| CN202310142769.6A CN116163942A (en) | 2023-02-08 | 2023-02-08 | Control method and device for electric oil pump of electric automobile oil-cooled power assembly |
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| CN202310142769.6A CN116163942A (en) | 2023-02-08 | 2023-02-08 | Control method and device for electric oil pump of electric automobile oil-cooled power assembly |
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