CN113783360B - Cooling system for electric drive system - Google Patents
Cooling system for electric drive system Download PDFInfo
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- CN113783360B CN113783360B CN202111082238.XA CN202111082238A CN113783360B CN 113783360 B CN113783360 B CN 113783360B CN 202111082238 A CN202111082238 A CN 202111082238A CN 113783360 B CN113783360 B CN 113783360B
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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
- B60K11/00—Arrangement in connection with cooling of propulsion units
- B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0402—Cleaning of lubricants, e.g. filters or magnets
- F16H57/0404—Lubricant filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0412—Cooling or heating; Control of temperature
- F16H57/0415—Air cooling or ventilation; Heat exchangers; Thermal insulations
- F16H57/0417—Heat exchangers adapted or integrated in the gearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control
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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
- Y02T10/64—Electric machine technologies in electromobility
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention provides a cooling system for an electric drive system, comprising a speed reducer oil circuit for lubricating a speed reducer and a motor oil circuit for cooling a motor, wherein the cooling system further comprises: the first flow regulating valve is arranged between the oil circuit of the speed reducer and the oil circuit of the motor; the second flow regulating valve is connected with the motor oil circuit; the oil pump is connected with the first flow regulating valve and is connected with an oil way flowing out through the second flow regulating valve; the first flow regulating valve controls the flow distribution of the oil path flowing to the speed reducer and the motor oil path, and the second flow regulating valve controls the oil flow flowing to the motor stator and the motor rotor; the oil pump controls the flow of oil to the first flow rate adjustment valve. By adopting the technical scheme, the flow rate of the oil flowing into the motor/reducer and the motor stator/rotor can be adjusted.
Description
Technical Field
The invention relates to the field of control of electric drive systems, in particular to a cooling system for an electric drive system.
Background
With the rapid development of new energy automobiles and the strong support of industry, the motor in the new energy automobiles is taken as the most critical component, and the development is rapid in recent years. According to various requirements of a user end, the motor control strategy and the cooling strategy are gradually refined and optimized.
Wherein the individual subsystems need to be lubricated and cooled by means of oil cooling when the electric drive system is in operation. However, in the prior art, the oil cooling mode is simpler, and the problems that the lubricating/cooling oil requirements are different under different working conditions or the flow distribution ratio of the cooling oil cannot be adjusted cannot be satisfied.
Therefore, a novel cooling system is needed, and the waste of cooling oil flow is avoided through the optimal configuration of oil quantity, so that the loads of an oil pump and the system are reduced, the loss is reduced, and the volume is reduced.
Disclosure of Invention
In order to overcome the technical defects, the invention aims to provide a cooling system for an electric drive system, which realizes flow adjustment of oil flowing into a motor/reducer and a motor stator/rotor.
The invention discloses a cooling system for an electric drive system, which comprises a speed reducer oil circuit for lubricating a speed reducer and a motor oil circuit for cooling a motor, and further comprises:
the first flow regulating valve is arranged between the oil circuit of the speed reducer and the oil circuit of the motor;
the second flow regulating valve is connected with the motor oil circuit;
the oil pump is connected with the first flow regulating valve and is connected with an oil way flowing out through the second flow regulating valve;
the first flow regulating valve controls the flow distribution of the oil path flowing to the speed reducer and the motor oil path, and the second flow regulating valve controls the oil flow flowing to the motor stator and the motor rotor;
the oil pump controls the flow of oil to the first flow rate adjustment valve.
Preferably, the cooling system further comprises:
the speed reducer cavity and locate the speed reducer transmission module in the speed reducer cavity, with speed reducer oil circuit intercommunication, wherein speed reducer transmission module includes:
the meshing tooth surface, the first bearing of the input shaft, the second bearing of the input shaft, the first bearing of the intermediate shaft and the second bearing of the intermediate shaft are respectively connected with the oil way of the speed reducer so as to receive cooling oil in the oil way of the speed reducer;
the filter is respectively connected with the speed reducer cavity and the oil pump;
and the oil-water heat exchanger is respectively connected with the oil pump and the first flow regulating valve and transmits cooling oil which cools the inside of the speed reducer cavity to the first flow regulating valve.
Preferably, the cooling system further comprises:
the motor cavity is communicated with the speed reducer cavity;
the motor is located in the motor cavity, and wherein, the motor includes:
the motor bearing, the rotor shaft and the stator core are respectively communicated with the second flow regulating valve so as to receive cooling oil distributed by the second flow regulating valve;
a stator winding connected to the stator core and the rotor shaft, respectively, to receive cooling oil flowing out from the stator core and the rotor shaft;
the stator winding is arranged in the motor cavity, and the cooling oil flows back to the motor cavity after flowing through the stator winding and flows to the speed reducer cavity.
Preferably, the cooling system further comprises a control module, which is electrically connected with the speed reducer, the motor, the oil pump, the first flow regulating valve and the second flow regulating valve and used for receiving state information of the speed reducer, the motor and the oil pump;
the control module is internally provided with a first control strategy aiming at the first flow regulating valve, a second control strategy aiming at the second flow regulating valve, a motor rotating speed threshold value and an electric drive system load threshold value;
the first control strategy and the second flow regulating valve control the opening degree of the first flow regulating valve and the second flow regulating valve based on the comparison results of the state of the speed reducer and the motor, the motor rotating speed threshold value and the electric drive system load threshold value.
Preferably, the control module compares the current rotational speed of the motor to a motor rotational speed threshold;
the first control strategy includes:
when the current rotating speed is smaller than the motor rotating speed threshold value, controlling the oil pump to apply cooling oil to the first flow regulating valve based on the first flow, wherein the first flow regulating valve is controlled by the control module to distribute a first branch flow flowing to the oil way of the speed reducer and a second branch flow of the oil way of the motor, and the first branch flow is smaller than or equal to the second branch flow;
when the current rotating speed is greater than or equal to the motor rotating speed threshold value, the oil pump is controlled to apply cooling oil to the first flow regulating valve based on the second flow, the first flow regulating valve is controlled by the control module, the third branch flow flowing to the oil way of the speed reducer and the fourth branch flow of the motor oil way are distributed, and the third branch flow is smaller than or equal to the fourth branch flow;
the second control strategy includes:
when the current rotating speed is smaller than the motor rotating speed threshold value, the second flow regulating valve is controlled by the control module to distribute the first rotor flow flowing to the motor rotor and the first stator flow flowing to the motor stator, wherein the first rotor flow is larger than or equal to the first stator flow;
when the current rotation speed is greater than or equal to the motor rotation speed threshold value, the second flow regulating valve is controlled by the control module to distribute a second rotor flow flowing to the motor rotor and a second stator flow flowing to the motor stator, and the second rotor flow is smaller than the second stator flow.
Preferably, the control module compares a current load of the electric drive system to an electric drive system load threshold;
the first control strategy includes:
when the current rotating speed is smaller than the motor rotating speed threshold value and the current load of the electric drive system is smaller than the load threshold value of the electric drive system, reducing the first flow;
when the current rotating speed is smaller than the motor rotating speed threshold value and the current load of the electric drive system is larger than or equal to the load threshold value of the electric drive system, increasing the first branch flow;
the second control strategy includes:
when the current rotating speed is greater than or equal to the motor rotating speed threshold value and the current load of the electric drive system is smaller than the load threshold value of the electric drive system, increasing the second stator flow;
and when the current rotating speed is greater than or equal to the motor rotating speed threshold value and the current load of the electric drive system is greater than or equal to the electric drive system load threshold value, increasing the second rotor flow and the second stator flow, and controlling the second rotor flow to be greater than the second stator flow.
Preferably, the control module collects any one or more of electric frequency, current, motor efficiency, motor loss, stator temperature, rotor temperature, oil temperature of the motor to form status information of the speed reducer, motor, oil pump.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
1. the distribution of the cooling oil is regulated by comprehensively considering the rotating speed and the output torque of the motor, thereby ensuring good lubrication of parts and cooling performance under high load
2. The power requirement on the oil pump is reduced through reasonable flow distribution, so that the load generated by the operation of the oil pump is reduced;
3. because of the flow distribution function, the electronic pump can be replaced by a mechanical pump, and the flow adjustment is realized based on the mechanical pump, so that the cost is further reduced.
Drawings
FIG. 1 is a schematic diagram of a cooling system according to a preferred embodiment of the present invention.
Detailed Description
Advantages of the invention are further illustrated in the following description, taken in conjunction with the accompanying drawings and detailed description.
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "at … …" or "responsive to a determination", depending on the context.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanical or electrical, or may be in communication with each other between two elements, directly or indirectly through intermediaries, as would be understood by those skilled in the art, in view of the specific meaning of the terms described above.
In the following description, suffixes such as "module", "component", or "unit" for representing elements are used only for facilitating the description of the present invention, and are not of specific significance per se. Thus, "module" and "component" may be used in combination.
Referring to fig. 1, a schematic diagram of a cooling system according to a preferred embodiment of the present invention is shown, in which the cooling system includes a speed reducer and a motor, and the cooling object of the cooling system is the speed reducer and the motor. Therefore, the speed reducer oil way for lubricating the speed reducer and the motor oil way for cooling the motor are arranged, and in order to control the oil supply modes of the speed reducer oil way and the motor oil way under different working conditions, the cooling system further comprises a first flow regulating valve, a second flow regulating valve and an oil pump, wherein the first flow regulating valve is arranged between the speed reducer oil way and the motor oil way, the first flow regulating valve regulates according to the opening degree of the first flow regulating valve, the proportion of cooling oil flowing to the speed reducer oil way and the motor oil way is regulated, the second flow regulating valve is arranged on the motor oil way and is connected with a motor stator and a motor rotor, and the proportion of cooling oil flowing to the motor stator and the motor rotor is regulated. And the oil pump is connected with the first flow regulating valve and is connected with an oil path flowing out through the second flow regulating valve. On one hand, the whole oil way is closed to form a circulating oil way, and on the other hand, the whole oil way is used as a global handle control for the whole oil way to control the flow of the whole oil way.
After the configuration is adopted, the working efficiency of the oil pump can be controlled at first, the cooling efficiency of the oil circuit of the speed reducer and the oil circuit of the motor can be controlled directly, the control of the first flow regulating valve is used for controlling the separation flow when the cooling oil is separated for the first time, and the control of the second flow regulating valve is used for controlling the separation flow when the cooling oil is separated for the second time, so that the speed reducer, the motor stator and the motor rotor receive corresponding proper cooling oil for cooling under different working conditions and at different temperatures, the excessive temperature rise caused by too small cooling oil can be avoided, and the waste of power consumption caused by too much cooling oil can be avoided.
In a preferred embodiment, the cooling system further comprises: the speed reducer cavity and locate the speed reducer transmission module in the speed reducer cavity, with speed reducer oil circuit intercommunication, wherein speed reducer transmission module includes: the meshing tooth surface, the first bearing of the input shaft, the second bearing of the input shaft, the first bearing of the intermediate shaft and the second bearing of the intermediate shaft are respectively connected with the oil way of the speed reducer so as to receive cooling oil in the oil way of the speed reducer; the filter is respectively connected with the speed reducer cavity and the oil pump; and the oil-water heat exchanger is respectively connected with the oil pump and the first flow regulating valve and transmits cooling oil which cools the inside of the speed reducer cavity to the first flow regulating valve. By the arrangement of the retarder cavity and the interior, part of the cooling oil distributed to the retarder oil circuit by the first flow regulating valve will cool the retarder interior completely.
Further, on the motor side, the cooling system includes: the motor cavity is communicated with the speed reducer cavity; the motor is located in the motor cavity, and wherein, the motor includes: the motor bearing, the rotor shaft and the stator core are respectively communicated with the second flow regulating valve so as to receive cooling oil distributed by the second flow regulating valve; a stator winding connected to the stator core and the rotor shaft, respectively, to receive cooling oil flowing out from the stator core and the rotor shaft; the stator winding is arranged in the motor cavity, and the cooling oil flows back to the motor cavity after flowing through the stator winding and flows to the speed reducer cavity. By the arrangement of the motor cavity and the interior, part of the cooling oil distributed to the motor stator and the motor rotor via the second flow regulating valve will cool the motor interior completely.
In the above embodiment, the first flow regulating valve and the second flow regulating valve can properly distribute the axial flow of the gear according to the oil stirring condition of the speed reducer, and properly distribute the flow of the motor according to the heating condition of each working condition of the motor, and properly distribute the flow of the stator and the rotor according to the rotating speed and the lubrication condition of the tail bearing.
In order to further control the oil pump, the first flow regulating valve and the second flow regulating valve, the cooling system further comprises a control module which is electrically connected with the speed reducer, the motor, the oil pump, the first flow regulating valve and the second flow regulating valve and receives state information of the speed reducer, the motor and the oil pump, so that a control instruction can be formed according to the state information. Further, a first control strategy for the first flow regulating valve, a second control strategy for the second flow regulating valve, a motor rotating speed threshold value and an electric drive system load threshold value are configured in the control module; under different strategy logics, the first control strategy and the second flow regulating valve control the opening degrees of the first flow regulating valve and the second flow regulating valve based on the comparison results of the states of the speed reducer and the motor, the motor rotating speed threshold value and the electric drive system load threshold value, so that flow regulation is performed.
The control module is used for comparing the current rotating speed of the motor with a motor rotating speed threshold value to divide the rotating speed of the motor into a low-speed state and a high-speed state, and under different embodiments, the first control strategy and the second control strategy respectively comprise:
first control strategy
When the current rotating speed is smaller than a motor rotating speed threshold (low speed), the oil pump is controlled to apply cooling oil to the first flow regulating valve based on the first flow, the first flow regulating valve is controlled by the control module to distribute the first branch flow flowing to the speed reducer oil path and the second branch flow of the motor oil path, and the first branch flow is smaller than or equal to the second branch flow, namely, the speed reducer has lower power consumption and generates less heat in a low-speed state, and main cooling oil is distributed to the side of the motor oil path;
when the current rotation speed is greater than or equal to the motor rotation speed threshold (high speed), the control oil pump applies cooling oil to the first flow regulating valve based on the second flow, the first flow regulating valve is controlled by the control module, and the third branch flow flowing to the speed reducer oil path and the fourth branch flow of the motor oil path are distributed, and the third branch flow is smaller than or equal to the fourth branch flow, namely, when the speed reducer is in a high speed state, although the power consumption of the speed reducer is higher, less heat can be generated, and relatively, the heat of the motor side is more, and more cooling oil still needs to be distributed to the motor oil path side.
Second control strategy
When the current rotating speed is smaller than a motor rotating speed threshold value (low speed), the second flow regulating valve is controlled by the control module to distribute a first rotor flow flowing to a motor rotor and a first stator flow flowing to a motor stator, wherein the first rotor flow is larger than or equal to the first stator flow;
when the current rotational speed is greater than or equal to a motor rotational speed threshold (high speed), the second flow regulating valve is controlled by the control module to distribute a second rotor flow to the motor rotor and a second stator flow to the motor stator, the second rotor flow being less than the second stator flow.
In addition to the rotational speed, the control module may consider a load condition of the electric drive system, which compares a current load of the electric drive system with an electric drive system load threshold value, and divides the load into a low load state and a high load state, where in different embodiments, the low load state and the high load state, the first control strategy and the second control strategy respectively include:
first control strategy
When the current rotating speed is smaller than the motor rotating speed threshold value and the current load of the electric drive system is smaller than the load threshold value of the electric drive system, reducing the first flow;
and when the current rotating speed is smaller than the motor rotating speed threshold value and the current load of the electric drive system is larger than or equal to the electric drive system load threshold value, increasing the first branch flow.
Second control strategy
When the current rotating speed is greater than or equal to the motor rotating speed threshold value and the current load of the electric drive system is smaller than the load threshold value of the electric drive system, increasing the second stator flow;
and when the current rotating speed is greater than or equal to the motor rotating speed threshold value and the current load of the electric drive system is greater than or equal to the electric drive system load threshold value, increasing the second rotor flow and the second stator flow, and controlling the second rotor flow to be greater than the second stator flow.
In other words, when the rotating speed is high and the load is high, the flow of the speed reducer can be properly increased, the tooth surface and the bearing are protected, the flow of the rotor is properly reduced under the condition of high rotating speed and low load, the dynamic balance performance of the rotor is improved, and otherwise, the flow of the motor is improved under the condition of high load, so that the heat dissipation of the motor is facilitated. Or under the working condition of high rotating speed, the speed reducer can be well lubricated by stirring oil, and the oil exists in a mist form in the speed reducer, so that the oil quantity of an oil way of the speed reducer can be reduced, and under the condition of high speed and low load, the flow of cooling oil is mainly concentrated on a motor stator, and the flow of a rotor is smaller due to the consideration of dynamic balance; under the high-speed and high-load condition, on the basis of the above, the flow rates of the stator and the rotor are increased simultaneously, and the flow rate proportion of the rotor is increased. On the other hand, under the working condition of low rotation speed and further low load, the speed reducer and the motor are not obvious in lubrication and heating, so that the power consumption of the whole vehicle can be reduced by reducing the oil supply; under the condition of high load, the speed reducer is low in speed and heavy in load, so that a certain amount of cooling oil is needed to lubricate the tooth surface, and the flow ratio of the speed reducer is properly improved; in the motor aspect, heat generation is mainly concentrated on the stator, so that the flow of the stator is required to be improved.
It can be understood that, besides the first control strategy and the second control strategy, a targeted control strategy can be correspondingly configured according to different working conditions, or under the condition that the whole flow is unchanged and the opening of each flow control valve is unchanged, the opening of one flow control valve is increased, so that the flow of the corresponding oil way of the valve is increased; and under the condition that the opening degree of all valves is unchanged, the flow rate of all oil ways is increased by increasing the rotation speed of the oil pump.
In any of the above embodiments, the control module collects any one or more of an electrical frequency, a current, a motor efficiency, a motor loss, a stator temperature, a rotor temperature, and an oil temperature of the motor to form status information of the speed reducer, the motor, and the oil pump.
It should be noted that the embodiments of the present invention are preferred and not limited in any way, and any person skilled in the art may make use of the above-disclosed technical content to change or modify the same into equivalent effective embodiments without departing from the technical scope of the present invention, and any modification or equivalent change and modification of the above-described embodiments according to the technical substance of the present invention still falls within the scope of the technical scope of the present invention.
Claims (4)
1. A cooling system for an electric drive system including a speed reducer oil passage for lubricating a speed reducer and a motor oil passage for cooling a motor, the cooling system further comprising:
the first flow regulating valve is arranged between the speed reducer oil circuit and the motor oil circuit;
the second flow regulating valve is connected with the motor oil circuit;
the oil pump is connected with the first flow regulating valve and is connected with an oil path flowing out through the second flow regulating valve;
the first flow regulating valve controls flow distribution of oil flowing to the speed reducer oil circuit and the motor oil circuit, and the second flow regulating valve controls oil flow flowing to the motor stator and the motor rotor;
the oil pump controls the oil flow flowing to the first flow regulating valve, and increases the rotation speed of the oil pump so as to increase the flow of all oil ways;
the cooling system further comprises a control module which is electrically connected with the speed reducer, the motor, the oil pump, the first flow regulating valve and the second flow regulating valve and receives state information of the speed reducer, the motor and the oil pump;
the control module is internally provided with a first control strategy for the first flow regulating valve, a second control strategy for the second flow regulating valve, a motor rotating speed threshold value and an electric drive system load threshold value;
the first control strategy and the second flow regulating valve control the opening degrees of the first flow regulating valve and the second flow regulating valve based on the comparison results of the states of the speed reducer and the motor, the motor rotating speed threshold value and the electric drive system load threshold value;
the control module compares the current rotating speed of the motor with a motor rotating speed threshold value;
the first control strategy includes:
when the current rotating speed is smaller than a motor rotating speed threshold value, controlling the oil pump to apply cooling oil to the first flow regulating valve based on a first flow, wherein the first flow regulating valve is controlled by the control module and distributes a first branch flow flowing to a speed reducer oil path and a second branch flow of a motor oil path, and the first branch flow is smaller than or equal to the second branch flow;
when the current rotating speed is greater than or equal to a motor rotating speed threshold value, controlling the oil pump to apply cooling oil to the first flow regulating valve based on the second flow, wherein the first flow regulating valve is controlled by the control module and distributes a third branch flow flowing to a speed reducer oil circuit and a fourth branch flow of a motor oil circuit, and the third branch flow is smaller than or equal to the fourth branch flow;
the second control strategy includes:
when the current rotating speed is smaller than a motor rotating speed threshold value, the second flow regulating valve is controlled by the control module to distribute first rotor flow flowing to a motor rotor and first stator flow flowing to a motor stator, and the first rotor flow is larger than or equal to the first stator flow;
when the current rotating speed is greater than or equal to a motor rotating speed threshold value, the second flow regulating valve is controlled by the control module to distribute a second rotor flow flowing to a motor rotor and a second stator flow flowing to a motor stator, and the second rotor flow is smaller than the second stator flow;
the control module also compares a current load of the electric drive system with an electric drive system load threshold;
the first control strategy includes:
when the current rotating speed is smaller than a motor rotating speed threshold value and the current load of the electric drive system is smaller than an electric drive system load threshold value, reducing the first flow;
when the current rotating speed is smaller than the motor rotating speed threshold value and the current load of the electric drive system is larger than or equal to the load threshold value of the electric drive system, increasing the first branch flow;
the second control strategy includes:
when the current rotating speed is greater than or equal to the motor rotating speed threshold value and the current load of the electric drive system is smaller than the load threshold value of the electric drive system, increasing the second stator flow;
and when the current rotating speed is greater than or equal to the motor rotating speed threshold value and the current load of the electric drive system is greater than or equal to the electric drive system load threshold value, increasing the second rotor flow and the second stator flow, and controlling the second rotor flow to be greater than the second stator flow.
2. The cooling system of claim 1, wherein the cooling system further comprises:
the speed reducer cavity and locate the speed reducer transmission module in the speed reducer cavity with speed reducer oil circuit intercommunication, wherein the speed reducer transmission module includes:
the meshing tooth surface, the first bearing of the input shaft, the second bearing of the input shaft, the first bearing of the intermediate shaft and the second bearing of the intermediate shaft are respectively connected with the oil way of the speed reducer so as to receive cooling oil in the oil way of the speed reducer;
the filter is respectively connected with the speed reducer cavity and the oil pump;
and the oil-water heat exchanger is respectively connected with the oil pump and the first flow regulating valve and transmits cooling oil which cools the inside of the speed reducer cavity to the first flow regulating valve.
3. The cooling system of claim 2, wherein the cooling system further comprises:
the motor cavity is communicated with the speed reducer cavity;
the motor is located in the motor cavity, wherein, the motor includes:
the motor bearing, the rotor shaft and the stator core are respectively communicated with the second flow regulating valve so as to receive the cooling oil distributed by the second flow regulating valve;
a stator winding connected to the stator core and the rotor shaft, respectively, to receive cooling oil flowing out from the stator core and the rotor shaft;
the stator winding is arranged in the motor cavity, and cooling oil flows back to the motor cavity after flowing through the stator winding and flows to the speed reducer cavity.
4. The cooling system of claim 1, wherein the control module gathers any one or more of electrical frequency, current, motor efficiency, motor losses, stator temperature, rotor temperature, oil temperature of the motor to form status information for a decelerator, motor, oil pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111082238.XA CN113783360B (en) | 2021-09-15 | 2021-09-15 | Cooling system for electric drive system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111082238.XA CN113783360B (en) | 2021-09-15 | 2021-09-15 | Cooling system for electric drive system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113783360A CN113783360A (en) | 2021-12-10 |
| CN113783360B true CN113783360B (en) | 2023-05-12 |
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| CN114992312A (en) * | 2022-05-30 | 2022-09-02 | 东风汽车集团股份有限公司 | Lubricated cooling system of electric drive assembly and car |
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| FR2972488B1 (en) * | 2011-03-10 | 2013-03-29 | Peugeot Citroen Automobiles Sa | THERMAL ENGINE LUBRICATING SYSTEM COMPRISING A VARIABLE CYLINDER OIL PUMP |
| CN107499113B (en) * | 2017-05-18 | 2019-11-22 | 宝沃汽车（中国）有限公司 | The control method and device of the coolant rate distribution of drive system of electric automobile |
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| CN110212701B (en) * | 2019-06-21 | 2023-04-11 | 上海蔚来汽车有限公司 | Electric drive unit cooling system |
| JP2021118605A (en) * | 2020-01-24 | 2021-08-10 | 本田技研工業株式会社 | Dynamo-electric motor cooling system |
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