CN114899987A - Oil circuit switching method of integrated oil-cooled electric drive system - Google Patents
Oil circuit switching method of integrated oil-cooled electric drive system Download PDFInfo
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- CN114899987A CN114899987A CN202210586574.6A CN202210586574A CN114899987A CN 114899987 A CN114899987 A CN 114899987A CN 202210586574 A CN202210586574 A CN 202210586574A CN 114899987 A CN114899987 A CN 114899987A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K2001/003—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units
- B60K2001/006—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units the electric motors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention discloses an oil circuit switching method of an integrated oil-cooled electric drive system, which is suitable for the electric drive system, wherein the electric drive system comprises an oil reservoir, an oil pump, a regulator, a radiator and a cooling oil channel; the oil pump is used for pumping cooling oil in the oil reservoir to the regulator; the regulator is used for switching oil circuit circulation by controlling cooling oil to flow to the cooling oil duct or the radiator; the radiator is used for radiating the cooling oil; the cooling oil passage is used for absorbing heat of a heat generating component of the electric drive system; detecting temperature data of the electric drive system by a temperature sensor distributed in the electric drive system; matching corresponding control instructions in a preset control instruction library; and controlling the regulator according to the control command so as to switch the oil passage of the electric drive system. According to the temperature of the electric driving system, different cooling effects are realized by switching oil ways, the electric driving system is guaranteed to work in a proper temperature range, and the power output efficiency of the electric driving system is guaranteed.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to an oil way switching method of an integrated oil-cooled electric drive system.
Background
With the enhancement of the environmental protection consciousness of the public, the market of new energy automobiles is increasingly strong. The cooling system of the electric drive system of the new energy automobile plays a crucial role in the efficiency of the power assembly of the electric drive. However, the cooling system of the existing electric driving system of the new energy automobile is complex in structure and unstable in cooling effect, so that the temperature fluctuation of the electric driving system of the new energy automobile is large, and the power output efficiency is influenced.
Disclosure of Invention
In order to solve the above problems, the present invention provides an oil path switching method for an integrated oil cooling electric drive system, which can maintain the temperature stability of the electric drive system and ensure the power efficiency of the electric drive system.
The embodiment of the invention provides an oil way switching method of an integrated oil-cooled electric drive system, which is suitable for the integrated oil-cooled electric drive system, wherein the electric drive system comprises an oil reservoir, an oil pump, a regulator, a radiator and a cooling oil channel; the oil pump is used for pumping cooling oil in the oil reservoir to the regulator; the regulator is used for switching oil circuit circulation by controlling cooling oil to flow to the cooling oil duct or the radiator; the radiator is used for radiating the cooling oil; the cooling oil duct is used for receiving the cooling oil delivered by the radiator or the regulator, absorbing the heat of a heat generating component of the electric drive system, and delivering the cooling oil to an oil reservoir; at least one temperature sensor is distributed in the electric drive system;
the method comprises the following steps:
detecting temperature data of the electric drive system via temperature sensors distributed in the electric drive system;
matching a corresponding control instruction in a preset control instruction library according to the temperature data;
and controlling the regulator to switch the oil passage of the electric drive system according to the control command.
Preferably, the heat generating components of the electric drive system include a controller, a motor, and a speed reducer;
the controller, the motor and the speed reducer are integrated inside the housing of the electric drive system and are in contact with the cooling oil ducts distributed inside the housing of the electric drive system.
Preferably, the oil reservoir, the oil pump, the regulator, and the cooling gallery are disposed within a housing of the electric drive system; the radiator is arranged outside the shell;
the oil reservoir, the oil pump, the regulator, the cooling oil duct and the radiator are connected through oil ducts to form two oil-way circulation; respectively an external circulation oil way and an internal circulation oil way;
the external circulation oil way is formed by sequentially connecting the oil reservoir, the oil pump, the regulator, the radiator and the cooling oil duct;
the internal circulation oil path is formed by sequentially connecting the oil storage device, the oil pump, the regulator and the cooling oil duct.
Preferably, a first temperature sensor is configured on a power component of a controller of the electric drive system;
a stator winding of a motor of the electric drive system is provided with a second temperature sensor;
a third temperature sensor is provided on the regulator of the electric drive system.
As an improvement of the above scheme, the temperature data includes a first temperature value, a second temperature value, and a third temperature value;
the temperature data of the electric drive system is detected through temperature sensors distributed in the electric drive system, and the method specifically comprises the following steps:
detecting a first temperature value of the controller by the first temperature sensor;
detecting a second temperature value of the motor by the second temperature sensor;
detecting a third temperature value of the cooling oil passing through the regulator by the third temperature sensor.
Preferably, the corresponding control instruction is matched in a preset control instruction library according to the temperature data;
when a first temperature value in the temperature data is smaller than a preset first temperature threshold value, a second temperature value in the temperature data is smaller than a preset second temperature threshold value, and a third temperature value in the temperature data is smaller than a preset third temperature threshold value, matching a first control instruction in the control instruction library;
and when the first temperature value is not less than the first temperature threshold, or the second temperature value is not less than the second temperature threshold, or the third temperature value is not less than the third temperature threshold, matching a second control instruction in the control instruction library.
Preferably, the controlling the regulator to switch the oil passage of the electric drive system according to the control command specifically includes:
when the control instruction is a first control instruction, controlling the regulator to directly convey the cooling oil conveyed by the oil pump to the cooling oil duct;
and when the control instruction is a second control instruction, controlling the regulator to convey the cooling oil conveyed by the oil pump to the radiator.
Preferably, the regulator comprises a three-way valve;
the oil path input end of the three-way valve is connected with the oil path output end of the oil pump, the first oil path output end of the three-way valve is connected with the oil path input end of the radiator, and the second oil path output end of the three-way valve is connected with the oil path input end of the cooling oil path.
Preferably, a cooling oil duct is arranged between the controller and the shell, a cooling oil duct is arranged between the motor and the shell, and a cooling oil duct is arranged between the speed reducer and the shell;
the cooling oil duct distributed in the shell further comprises a lubricating oil duct, and the lubricating oil duct is laid among the gear, the bearing and the shell of the speed reducer and is used for lubricating the speed reducer.
Preferably, the electric drive system further comprises an oil filter;
the oil filter filters impurities of the cooling oil in the oil passage circuit of the oil pump.
The invention provides an oil circuit switching method of an integrated oil-cooled electric drive system, wherein the electric drive system comprises an oil reservoir, an oil pump, a regulator, a radiator and a cooling oil channel; the oil pump is used for pumping cooling oil in the oil reservoir to the regulator; the regulator is used for switching oil circuit circulation by controlling cooling oil to flow to the cooling oil duct or the radiator; the radiator is used for radiating the cooling oil; the cooling oil duct is used for receiving the cooling oil delivered by the radiator or the regulator, absorbing the heat of a heat generating component of the electric drive system, and delivering the cooling oil to an oil reservoir; at least one temperature sensor is distributed in the electric drive system; detecting temperature data of the electric drive system via temperature sensors distributed in the electric drive system; matching a corresponding control instruction in a preset control instruction library according to the temperature data; and controlling the regulator to switch the oil passage of the electric drive system according to the control command. The temperature of the electric drive system is detected, and the oil circuit circulation configured for the electric drive system is changed, so that different cooling effects are realized; the temperature of the electric drive system is balanced, the electric drive system is guaranteed to work in a proper temperature range, and the power output efficiency of the electric drive system is guaranteed.
Drawings
FIG. 1 is a schematic diagram of an integrated oil-cooled electric drive system according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of an oil circuit switching method of an integrated oil-cooled electric drive system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an integrated oil-cooled electric drive system according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a regulator according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic structural diagram of an integrated oil-cooled electric drive system according to an embodiment of the present invention is shown, where the electric drive system includes an oil reservoir 5, an oil pump 6, a regulator 8, a radiator 9, and a cooling oil gallery 10;
the oil path output end of the oil reservoir 5 is connected with the oil path input end of the oil pump 6 through an oil path, the oil path output end of the oil pump 6 is connected with the oil path input end of the regulator 8, the first oil path output end of the regulator 8 is connected with the oil path input end of the radiator 9, the second oil path output end of the regulator 8 is connected with the oil path input end of the cooling oil path 10, the oil path output end of the cooling oil path 10 and the oil path output end of the radiator 9 are both connected with the oil path input end of the cooling oil path 10, and the oil path output end of the cooling oil path 10 is connected with the oil path input end of the oil reservoir 5; oil circuit circulation of the electric drive system is formed;
the oil storage device 5 is used for collecting cooling oil flowing back in the oil passage loop, and an oil drainage bolt is mounted at the bottom of the oil storage device 5 and can drain the cooling oil in the oil passage loop and replace the cooling oil;
the oil pump 6 is used for pressure-feeding the cooling oil in the oil reservoir 5 to the regulator 8;
the regulator 8 is used for switching oil circuit circulation by controlling the flow of cooling oil to the cooling oil passage 10 or the radiator 9;
the radiator 9 is used for radiating the cooling oil passing through the radiator and conveying the cooled cooling oil to the cooling oil duct;
the cooling oil passage 10 is used for receiving cooling oil delivered by the radiator 9 or the regulator 8, absorbing heat of heat generating components of the electric drive system through the cooling oil flowing through, and delivering the cooling oil to the oil reservoir 5;
at least one temperature sensor T is distributed in the electric drive system for detecting the temperature at different locations in the electric drive system.
Referring to fig. 2, the flowchart of the oil path switching method of the integrated oil cooling electric drive system according to the embodiment of the present invention is shown, where the method includes steps S1 to S3:
s1, detecting temperature data of the electric drive system through temperature sensors distributed in the electric drive system;
s2, matching corresponding control instructions in a preset control instruction library according to the temperature data;
and S3, controlling the regulator to switch the oil channel of the electric drive system according to the control command.
In the specific implementation of the embodiment, the temperatures of different positions in the electric drive system are monitored through the temperature sensors distributed in the electric drive system, and corresponding temperature data are obtained; the temperature data comprises a temperature of at least one location in the electric drive system; the amount of data in the temperature data depends on the number of temperature sensors distributed in the electric drive system;
matching a corresponding control instruction in a preset control instruction library according to the temperature in the temperature data; the control instruction library comprises the corresponding relation between the temperature of each temperature data in the temperature data and the control instruction; matching corresponding control instructions by judging the size relationship between each temperature value in the temperature data and a correspondingly set threshold;
controlling the regulator to change the flow direction of the cooling oil according to the matched control instruction, controlling the cooling oil to directly flow to the cooling oil duct or flow through the radiator, radiating heat and then flow to the cooling oil duct, and switching oil path circulation;
the temperature of the electric drive system is detected, and the oil circuit circulation configured for the electric drive system is changed, so that different cooling effects are realized; the temperature of the electric drive system is balanced, the electric drive system is guaranteed to work in a proper temperature range, and the power output efficiency of the electric drive system is guaranteed.
In yet another embodiment provided by the present invention, the heat generating components of the electric drive system include a controller, a motor, and a speed reducer;
the controller, the motor with the reduction gear integration is in inside the casing of electric drive system, with distribute in inside the casing of electric drive system the cooling oil duct contact.
In the specific implementation of this embodiment, referring to fig. 3, a schematic structural diagram of an integrated oil-cooling electric drive system according to another embodiment of the present invention is shown; the heat generating components of the electric drive system include a controller 2, a motor 3, and a reducer 4;
the controller 2, the motor 3 and the speed reducer 4 are integrated in the shell 1 of the electric drive system and are in contact with cooling oil ducts 10 distributed in the shell 1; the cooling oil duct 10 is used for circulating cooling oil to take away heat of the controller 2, the motor 3 and the speed reducer 4 integrated in the shell 1 through heat transfer;
through the cooling oil duct in the casing, carry out the heat transfer cooling to inside controller, motor and the reduction gear of casing, can improve heat transfer efficiency, improve the power assembly efficiency of electricity system of driving.
In yet another embodiment provided by the present invention, the oil reservoir, the oil pump, the regulator, and the cooling gallery are disposed within a housing of the electric drive system; the radiator is arranged outside the shell;
the oil reservoir, the oil pump, the regulator, the cooling oil duct and the radiator are connected through oil ducts to form two oil-way circulation; respectively an external circulation oil way and an internal circulation oil way;
the external circulation oil way is formed by sequentially connecting the oil reservoir, the oil pump, the regulator, the radiator and the cooling oil duct;
the internal circulation oil path is formed by sequentially connecting the oil storage device, the oil pump, the regulator and the cooling oil duct.
In the embodiment, the oil reservoir 5, the oil pump 6, the regulator 8 and the cooling gallery 10 are disposed inside the housing 1 of the electric drive system;
the heat sink 9 is disposed outside the housing; the heat of the cooling oil in the oil passage loop is transferred to the outside of the radiator through heat transfer, and the heat dissipation efficiency of the electric drive system is improved.
It should be noted that, in the embodiment of fig. 1, the heat sink 9 is disposed outside the housing to facilitate heat dissipation; in other embodiments, the heat sink is disposed on the housing and dissipates heat to the outside of the housing; the radiator can also be arranged in the shell, and heat is transferred to the outside of the shell by additionally arranging a radiating channel.
The system is characterized in that the connection relation between the input end and the output end of the oil way is switched by the regulator, and two different circulating oil ways including an external circulating oil way and an internal circulating oil way are realized.
The external circulation oil way is composed of an oil storage device 5, an oil pump 6, a regulator 8, a radiator 9 and a cooling oil duct 10 flowing through the controller 2, the motor 3 and the speed reducer 4 in sequence, and the heat dissipation efficiency of the system is improved through the heat dissipation of the radiator arranged outside the shell;
the internal circulation oil path is composed of an oil storage device 5, an oil pump 6, a regulator 8 and a cooling oil path 10 flowing through the controller 2, the motor 3 and the speed reducer 4 in sequence, and heat dissipation in a low-power state can be achieved without a radiator arranged outside the shell.
In another embodiment provided by the invention, a first temperature sensor is arranged on a power component of a controller of the electric drive system;
a stator winding of a motor of the electric drive system is provided with a second temperature sensor;
a third temperature sensor is provided on the regulator of the electric drive system.
In the specific implementation of the present embodiment, referring to fig. 3, the first temperature sensor T1 of the controller 2 of the electric drive system is configured on the power component, and the first temperature sensor T1 is used for detecting the temperature of the controller;
a second temperature sensor T2 of the electric machine 3 of the electric drive system is arranged on the stator winding, the second temperature sensor T2 being intended to detect the temperature of the electric machine;
the third temperature sensor T3 of the regulator 8 of the electric drive system is arranged in the oil passage of the regulator, and the third temperature sensor T3 is used to detect the temperature of the cooling oil passing over the regulator.
In yet another embodiment provided by the present invention, the temperature data includes a first temperature value, a second temperature value, and a third temperature value;
the step S1 specifically includes:
detecting a first temperature value of the controller by the first temperature sensor;
detecting a second temperature value of the motor by the second temperature sensor;
detecting a third temperature value of the cooling oil passing through the regulator by the third temperature sensor.
In this embodiment, the temperature data includes the temperature obtained by each temperature sensor in the electric drive system, namely:
a first temperature value T1 obtained by a first temperature sensor T1 arranged on the power component of the controller 2;
a second temperature value T2 obtained by a second temperature sensor T2 is configured on the stator winding of the motor 3;
a third temperature value T3 obtained by a third temperature sensor T3 is configured on the regulator 8;
the temperature sensor arranged in the electric drive system is used for detecting the temperature of the controller greatly influenced by the temperature and the temperature of the motor with larger heat generation, so that the temperature of the electric drive system can be reflected more accurately; the temperature sensor arranged on the regulator can detect the temperature of the cooling oil in the oil circuit circulation and reflect the cooling effect of the current oil circuit circulation; from the temperatures at the regulator, the motor and the controller, the temperature condition of the electric drive system can be determined.
In another embodiment provided by the present invention, the step S2 specifically includes:
when a first temperature value in the temperature data is smaller than a preset first temperature threshold value, a second temperature value in the temperature data is smaller than a preset second temperature threshold value, and a third temperature value in the temperature data is smaller than a preset third temperature threshold value, matching a first control instruction in the control instruction library;
and when the first temperature value is not less than the first temperature threshold, or the second temperature value is not less than the second temperature threshold, or the third temperature value is not less than the third temperature threshold, matching a second control instruction in the control instruction library.
In the specific implementation of this embodiment, before the oil path switching is implemented, a temperature threshold needs to be set for each component in the temperature data in advance, that is, a first temperature threshold a is set for the controller 2, a second temperature threshold B is set for the motor 3, and a third temperature threshold C is set for the regulator;
after the temperature data are obtained, judging each temperature value in the temperature data and a correspondingly set temperature threshold value; that is, the magnitude relation between the first temperature value t1 and the first temperature threshold a, the magnitude relation between the second temperature value t2 and the second temperature threshold B, and the magnitude relation between the third temperature value t3 and the third temperature threshold C are determined;
when t1< A, t2< B and t3< C, namely all temperature values in the temperature data are smaller than the correspondingly set temperature threshold value, the temperature of the electric drive system is low, and the first control command in the control command library is matched;
when t1 is greater than or equal to A, t2 is greater than or equal to B, or t3 is greater than or equal to C, namely the temperature value in the temperature data is not less than the correspondingly set temperature threshold value, the temperature of the electric drive system is indicated to be higher, and the second control instruction in the control instruction library is matched;
and comparing the temperature value with a preset temperature threshold value to determine whether the temperature state of the electric drive system is maintained in a lower state or a higher state, matching a control instruction and controlling the regulator to balance the temperature.
In another embodiment provided by the present invention, the step S3 specifically includes:
when the control instruction is a first control instruction, controlling the regulator to directly convey the cooling oil conveyed by the oil pump to the cooling oil duct;
and when the control instruction is a second control instruction, controlling the regulator to convey the cooling oil conveyed by the oil pump to the radiator.
In the specific implementation of the embodiment, when the control command is a first control command, that is, when it is determined through temperature data that the temperature of the electric drive system is kept at a low temperature condition, the regulator is controlled to directly deliver the cooling oil delivered by the oil pump to the cooling oil passage; namely, the oil passage is circularly switched to an internal circulation oil passage; the cooling oil does not dissipate heat through a radiator, so that the temperature of the electric drive system is kept balanced and is not too low.
When the control instruction is a second control instruction, namely the temperature of the electric drive system is judged to be higher through temperature data, the regulator is controlled to convey the cooling oil conveyed by the oil pump to the radiator, and the cooling oil is conveyed to the cooling oil duct after being radiated by the radiator; namely, the oil passage is circularly switched to an external circulation oil passage; the cooling oil is radiated by the radiator, so that the radiating efficiency is improved, the temperature balance of the electric drive system is kept, and the situation that the temperature is too high is avoided.
By maintaining the temperature balance of the electric drive system, the phenomenon that when the temperature of the electric drive system is too low, the friction loss of a motor bearing, a reducer gear and a bearing is large due to the large viscosity of cooling oil, so that the abrasion of the reducer gear is aggravated is avoided, the problems that the electric drive system continuously runs at too low temperature and the power efficiency is reduced can be avoided, and the low-temperature running efficiency of the electric drive system and the winter endurance mileage of the whole vehicle are improved; when the temperature of the electric drive system is prevented from being too high, the working performance of the electric drive system is unstable, the power output efficiency is reduced, and the risk caused by potential overtemperature is avoided.
In yet another embodiment provided by the present invention, the regulator includes a three-way valve;
the oil path input end of the three-way valve is connected with the oil path output end of the oil pump, the first oil path output end of the three-way valve is connected with the oil path input end of the radiator, and the second oil path output end of the three-way valve is connected with the oil path input end of the cooling oil path.
In the specific implementation of the present embodiment, refer to fig. 4, which is a schematic structural diagram of an adjuster according to an embodiment of the present invention; the regulator is a three-way valve;
cooling oil pumped by the oil pump flows into the three-way valve from an oil path input end IN of the three-way valve, a first oil path output end OUT1 of the three-way valve is connected with an oil path input end of the radiator, and a second oil path output end OUT2 of the three-way valve is connected with an oil path input end of a cooling oil path;
the flow direction of the cooling oil in the three-way valve is controlled by the position of a switch K, and in a) in fig. 4, the switch K deviates to the direction of the first oil path output end OUT1, so that the cooling oil is controlled to flow to the cooling oil path, namely, to enter the internal circulation oil path; in b) of fig. 4, the switch K is biased in the direction of the second oil path output terminal OUT2, and the cooling oil is controlled to flow to the radiator, i.e., to enter the external circulation oil path.
The three-way valve controls the flow direction of the cooling oil to different oil path output ends, so that the circulation of the oil path is controlled conveniently, and the regulator has a simple structure.
In another embodiment provided by the present invention, preferably, a cooling oil passage is provided between the controller and the housing, a cooling oil passage is provided between the motor and the housing, and a cooling oil passage is provided between the speed reducer and the housing;
the cooling oil duct distributed in the shell further comprises a lubricating oil duct, and the lubricating oil duct is laid among the gear, the bearing and the shell of the speed reducer and is used for lubricating the speed reducer.
In the specific implementation of this embodiment, the controller 2 is connected to the battery of the electric drive system through the dc bus, and is connected to the three-phase line of the motor 3 through the copper bar, the power output end of the motor 3 is connected to the power input end of the speed reducer 4, and the power output end of the speed reducer 4 outputs power, that is, the output shaft of the motor 3 is coaxially connected to the input shaft of the speed reducer 4; the controller receives the energy of the configured battery and controls the motor to work, and the motor outputs power through the speed reducer to realize the power output of the electric driving system.
The controller 2 is in direct contact with a cooling oil channel 10 laid on the shell 1 and cools the controller through heat transfer;
the motor 3 is in contact with the casing 1 by laying a cooling oil passage 10, and the motor is cooled by heat transfer;
and a lubricating oil passage is arranged between the gear and the bearing of the speed reducer 4 and the shell 1, the lubricating oil passage is used as a part of the cooling oil passage, and the parts of the cooler are lubricated while the speed reducer is cooled by cooling oil in the cooling oil passage, so that the integration rate of the system is improved, and the cost is reduced.
In yet another embodiment provided by the present invention, the electric drive system further comprises an oil filter;
the oil filter filters impurities of the cooling oil in the oil passage circuit of the oil pump.
In the specific implementation of the embodiment, referring to fig. 3, the system further includes an oil filter 7, an oil passage input end of the oil filter 7 is connected with an oil passage output end of the oil pump 6, and an oil passage output end of the oil filter is connected with an oil passage input end of the regulator 8;
the oil filter 7 is used for filtering impurities of cooling oil in the oil passage loop, reducing the impurities in the cooling oil and avoiding oil passage blockage.
It should be noted that, in fig. 3, the oil filter is integrated inside the housing to save the cost of the oil passage circuit, and in another embodiment, the oil filter is disposed outside the housing and connected to the oil pump and the regulator through the oil pipeline to form the oil passage circuit.
It should be noted that, the sequence of the cooling oil passage flowing through the controller, the motor and the speed reducer does not substantially affect the technical effect of the scheme, and the sequence is within the protection scope of the scheme.
In still another embodiment provided by the present invention, the cooling oil passage passes through the heat generating component of the controller 2, the heat generating component of the motor 3, and the heat generating component of the speed reducer 4 integrated inside in this order;
the cooling oil duct preferentially passes through the controller, and preferentially cools the heating part of the controller, so that the performance reduction of the controller caused by overhigh temperature is avoided, and the working efficiency of the controller is improved.
In still another embodiment provided by the present invention, the cooling oil passage passes through the heat generating component of the motor 3, the heat generating component of the controller 2, and the heat generating component of the speed reducer 4 integrated inside in this order;
the cooling oil duct preferentially passes through the motor, preferentially cools the heating part of the motor, avoids the potential safety hazard of the motor due to overhigh temperature, and improves the safety performance of the electric drive system.
In still another embodiment provided by the present invention, the cooling oil passage flows through the heat generating components of the motor 3, the controller 2, and the reducer 4 integrated inside at the same time;
the cooling oil duct is used for cooling the motor, the controller and the speed reducer simultaneously, heat of the whole electric driving system is averaged, and comprehensive performance of the electric driving system is improved.
In still another embodiment of the present invention, the cooling oil passage flows through both the heat generating components of the motor 3 and the controller 2 integrated therein, and then through the heat generating components of the decelerator 4;
the cooling oil duct preferentially passes through the motor and the controller, preferentially cools heating parts of the controller and the motor, preferentially dissipates heat of the motor which generates heat greatly and the controller which has a large influence on performance, and improves the heat dissipation efficiency.
It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.
Claims (10)
1. The oil circuit switching method of the integrated oil-cooled electric drive system is characterized by being applicable to the integrated oil-cooled electric drive system, wherein the electric drive system comprises an oil reservoir, an oil pump, a regulator, a radiator and a cooling oil channel; the oil pump is used for pumping cooling oil in the oil reservoir to the regulator; the regulator is used for switching oil circuit circulation by controlling cooling oil to flow to the cooling oil duct or the radiator; the radiator is used for radiating the cooling oil; the cooling oil duct is used for receiving the cooling oil delivered by the radiator or the regulator, absorbing the heat of a heat generating component of the electric drive system, and delivering the cooling oil to an oil reservoir; at least one temperature sensor is distributed in the electric drive system;
the method comprises the following steps:
detecting temperature data of the electric drive system via temperature sensors distributed in the electric drive system;
matching a corresponding control instruction in a preset control instruction library according to the temperature data;
and controlling the regulator to switch the oil passage of the electric drive system according to the control command.
2. The oil circuit switching method of an integrated oil-cooled electric drive system of claim 1, wherein the heat generating components of the electric drive system include a controller, a motor, and a speed reducer;
the controller, the motor and the speed reducer are integrated inside the housing of the electric drive system and are in contact with the cooling oil ducts distributed inside the housing of the electric drive system.
3. The oil circuit switching method of an integrated oil-cooled electric drive system according to claim 1, wherein the oil reservoir, the oil pump, the regulator, and the cooling gallery are disposed inside a casing of the electric drive system; the radiator is arranged outside the shell;
the oil reservoir, the oil pump, the regulator, the cooling oil duct and the radiator are connected through oil ducts to form two oil-way circulation; respectively an external circulation oil way and an internal circulation oil way;
the external circulation oil way is formed by sequentially connecting the oil reservoir, the oil pump, the regulator, the radiator and the cooling oil duct;
the internal circulation oil path is formed by sequentially connecting the oil storage device, the oil pump, the regulator and the cooling oil duct.
4. The oil circuit switching method of the integrated oil-cooled electric drive system according to claim 1, wherein a first temperature sensor is arranged on a power component of a controller of the electric drive system;
a stator winding of a motor of the electric drive system is provided with a second temperature sensor;
a third temperature sensor is provided on the regulator of the electric drive system.
5. The oil circuit switching method of an integrated oil-cooled electric drive system of claim 4, wherein the temperature data comprises a first temperature value, a second temperature value, and a third temperature value;
the temperature data of the electric drive system is detected by temperature sensors distributed in the electric drive system, and the temperature data specifically comprises:
detecting a first temperature value of the controller by the first temperature sensor;
detecting a second temperature value of the motor by the second temperature sensor;
detecting a third temperature value of the cooling oil passing through the regulator by the third temperature sensor.
6. The oil circuit switching method of the integrated oil-cooled electric drive system according to claim 1, wherein the corresponding control command is matched in a preset control command library according to the temperature data;
when a first temperature value in the temperature data is smaller than a preset first temperature threshold value, a second temperature value in the temperature data is smaller than a preset second temperature threshold value, and a third temperature value in the temperature data is smaller than a preset third temperature threshold value, matching a first control instruction in the control instruction library;
and when the first temperature value is not less than the first temperature threshold, or the second temperature value is not less than the second temperature threshold, or the third temperature value is not less than the third temperature threshold, matching a second control instruction in the control instruction library.
7. The oil circuit switching method of the integrated oil-cooled electric drive system according to claim 1, wherein the controlling the regulator to switch the oil circuit of the electric drive system according to the control command specifically comprises:
when the control instruction is a first control instruction, controlling the regulator to directly convey the cooling oil conveyed by the oil pump to the cooling oil duct;
and when the control instruction is a second control instruction, controlling the regulator to convey the cooling oil conveyed by the oil pump to the radiator.
8. The method of switching oil paths in an integrated oil-cooled electric drive system of claim 1, wherein the regulator comprises a three-way valve;
the oil path input end of the three-way valve is connected with the oil path output end of the oil pump, the first oil path output end of the three-way valve is connected with the oil path input end of the radiator, and the second oil path output end of the three-way valve is connected with the oil path input end of the cooling oil path.
9. The oil circuit switching method of the integrated oil-cooled electric drive system according to claim 2, wherein a cooling oil passage is provided between the controller and the housing, a cooling oil passage is provided between the motor and the housing, and a cooling oil passage is provided between the speed reducer and the housing;
the cooling oil duct distributed in the shell further comprises a lubricating oil duct, and the lubricating oil duct is laid among the gear, the bearing and the shell of the speed reducer and is used for lubricating the speed reducer.
10. The method for switching the oil circuit of an integrated oil-cooled electric drive system of claim 1, wherein the electric drive system further comprises an oil filter;
the oil filter filters impurities of the cooling oil in the oil passage circuit of the oil pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210586574.6A CN114899987A (en) | 2022-05-27 | 2022-05-27 | Oil circuit switching method of integrated oil-cooled electric drive system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210586574.6A CN114899987A (en) | 2022-05-27 | 2022-05-27 | Oil circuit switching method of integrated oil-cooled electric drive system |
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| Publication Number | Publication Date |
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| CN114899987A true CN114899987A (en) | 2022-08-12 |
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| CN202210586574.6A Pending CN114899987A (en) | 2022-05-27 | 2022-05-27 | Oil circuit switching method of integrated oil-cooled electric drive system |
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| Country | Link |
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| CN (1) | CN114899987A (en) |
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- 2022-05-27 CN CN202210586574.6A patent/CN114899987A/en active Pending
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