CN114506198B - Electric drive system for vehicle, control method thereof and vehicle - Google Patents

Electric drive system for vehicle, control method thereof and vehicle Download PDF

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Publication number
CN114506198B
CN114506198B CN202210190193.6A CN202210190193A CN114506198B CN 114506198 B CN114506198 B CN 114506198B CN 202210190193 A CN202210190193 A CN 202210190193A CN 114506198 B CN114506198 B CN 114506198B
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Prior art keywords
vehicle
clutch
output shaft
power
motor
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CN114506198A (en
Inventor
柯枫
袁仪
陈宽能
张相宏
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Weilai Power Technology Hefei Co Ltd
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Weilai Power Technology Hefei Co Ltd
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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
    • B60K1/02—Arrangement or mounting of electrical propulsion units comprising more than one electric motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H1/3204—Cooling devices using compression
    • B60H1/3222—Cooling devices using compression characterised by the compressor driving arrangements, e.g. clutches, transmissions or multiple drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H1/3204—Cooling devices using compression
    • B60H1/3223—Cooling devices using compression characterised by the arrangement or type of the compressor
    • 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
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/02—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of clutch
    • 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
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W50/02—Ensuring safety in case of control system failures, e.g. by diagnosing, circumventing or fixing failures
    • B60W50/023—Avoiding failures by using redundant parts
    • 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
    • Y02T10/62—Hybrid vehicles

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Human Computer Interaction (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Hybrid Electric Vehicles (AREA)

Abstract

The application relates to the technical field of vehicles, and particularly provides an electric driving system for a vehicle, a control method of the electric driving system and the vehicle. In order to solve the problem that an electric drive system of the existing electric automobile causes complete vehicle failure when a main drive motor fails, the electric drive system comprises the main drive motor, a hybrid motor, a first clutch and a second clutch, the vehicle comprises a mechanical compressor, one end of the first clutch is connected with a first output shaft of the hybrid motor, the second clutch is connected with a second output shaft of the hybrid motor, the other end of the first clutch is connected with the mechanical compressor, the other end of the second clutch is connected with a first wheel end output shaft of the vehicle, and the main drive motor is connected with a second wheel end output shaft of the vehicle. The hybrid motor and the main drive motor are independent power supply systems, and the hybrid motor can simultaneously provide power for the vehicle and the mechanical compressor, so that the NVH problem of the compressor is solved, the occupation of the vehicle space is reduced, and the cost of the electric drive system is reduced.

Description

Electric drive system for vehicle, control method thereof and vehicle
Technical Field
The application relates to the technical field of vehicles, and particularly provides an electric driving system for a vehicle, a control method of the electric driving system and the vehicle.
Background
With the development of technology, electric automobiles are increasingly favored by consumers. The electric automobile in the prior art is simultaneously provided with a main driving motor, an auxiliary driving motor and a compressor motor, wherein the main driving motor provides main power for the running of the electric automobile and is responsible for providing basic dynamic requirements of the automobile in a set speed range; the auxiliary driving motor cooperates with the main driving motor to provide boost (power assisting); the compressor motor powers the compressor to meet the needs of vehicle thermal management. However, as the thermal management requirements of the vehicle increase, the electronic air conditioner compressor becomes correspondingly larger, resulting in an increase in the overall size of the compressor motor, which is difficult to accommodate in increasingly tight vehicle spaces, and as the power and rotational speed of the compressor increase, the NVH (noise, vibration and harshness) problems that it brings become increasingly serious. Patent document CN1927610a describes that both ends of a booster motor are connected to a compressor and a main drive system through a one-way clutch, respectively, so that the booster motor of such an electric drive system supplements the electric power to the main drive motor only when the power of the main drive motor is insufficient, but when the main drive motor is damaged to fail, the main drive motor cannot drive the vehicle to travel even though the power can be transmitted to the main drive motor in case that the power has failed, thereby seriously affecting the coping ability of the vehicle in extreme cases. In addition, the power-assisted motor can only supply power for one of the main driving motor and the compressor, and the arrangement of the whole electric driving system is quite unreasonable, so that the use experience of a user is greatly reduced.
Accordingly, there is a need in the art for a new electric drive system for a vehicle to address the problem of failure of the entire vehicle caused by failure of the primary drive motor of the existing electric vehicle.
Disclosure of Invention
The application aims to solve the technical problem that the electric drive system of the existing electric automobile causes the whole automobile to fail when the main drive motor fails.
In a first aspect, the present application provides an electric drive system for a vehicle, the vehicle comprising a mechanical compressor, the electric drive system comprising a main drive motor, a hybrid motor, a first clutch, and a second clutch, one end of the first clutch being connected to a first output shaft of the hybrid motor, the second clutch being connected to a second output shaft of the hybrid motor, the other end of the first clutch being connected to the mechanical compressor, the other end of the second clutch being connected to a first wheel end output shaft of the vehicle, the main drive motor being connected to a second wheel end output shaft of the vehicle; the first wheel end output shaft is one of a front wheel end output shaft or a rear wheel end output shaft of the vehicle, and the second wheel end output shaft is the other of the front wheel end output shaft or the rear wheel end output shaft.
In a preferred embodiment of the above electric drive system for a vehicle, the electric drive system further includes a reduction gearbox connected to the second clutch and the first wheel end output shaft, respectively.
In a preferred embodiment of the above electric drive system for a vehicle, the first clutch and the second clutch are of the friction plate type or dog clutch type.
In the above preferred embodiment of the electric drive system for a vehicle, a third clutch is provided between the main drive motor and the second wheel end output shaft.
The application also provides a control method of the electric drive system for the vehicle, the vehicle comprises a mechanical compressor, the electric drive system comprises a main drive motor, a hybrid motor, a first clutch and a second clutch, one end of the first clutch is connected with a first output shaft of the hybrid motor, the second clutch is connected with a second output shaft of the hybrid motor, the other end of the first clutch is connected with the mechanical compressor, the other end of the second clutch is connected with a first wheel end output shaft of the vehicle, and the main drive motor is connected with a second wheel end output shaft of the vehicle; the control method comprises the following steps:
detecting the power P of the main drive motor 1 ；
When the power P of the main driving motor 1 < first preset power P 0 And when receiving a command for starting the mechanical compressor, controlling the first clutch to be engaged with the mechanical compressor, and controlling the second clutch to be engaged with the first wheel end output shaft so as to enable the mixingAn electric motor simultaneously powers the first wheel end of the vehicle and the mechanical compressor.
In a preferred embodiment of the above control method for an electric drive system of a vehicle, "detecting the power P of the main drive motor 1 After the step of "the control method further includes:
when the power P of the main driving motor 1 Not less than the first preset power P 0 And when receiving an instruction for starting the mechanical compressor, controlling the first clutch to be engaged with the mechanical compressor, and controlling the second clutch to be separated from the first wheel end output shaft so that the hybrid motor independently provides power for the mechanical compressor.
In a preferred embodiment of the above control method for an electric drive system of a vehicle, "detecting the power P of the main drive motor 1 After the step of "the control method further includes:
when the power P of the main driving motor 1 < first preset power P 0 And when receiving a command of not starting the mechanical compressor, controlling the first clutch to be separated from the mechanical compressor, and controlling the second clutch to be engaged with the first wheel end output shaft so as to enable the hybrid motor to independently supply power for the first wheel end of the vehicle.
In a preferred embodiment of the above control method for an electric drive system of a vehicle, "detecting the power P of the main drive motor 1 After the step of "the control method further includes:
when the power P of the main driving motor 1 Not less than the first preset power P 0 And when receiving an instruction of not starting the mechanical compressor, controlling the first clutch to be separated from the mechanical compressor, and controlling the second clutch to be separated from the first wheel end output shaft so as to enable the hybrid motor to be in a standby state.
In a preferred embodiment of the above control method for an electric drive system of a vehicle, "when the power P of the main drive motor 1 < first preset power P 0 And receives start of the machineUpon command of the compressor, controlling the first clutch to engage the mechanical compressor and the second clutch to engage the first wheel end output shaft such that the hybrid electric machine simultaneously powers the first wheel end of the vehicle and the mechanical compressor, the control method further includes, after the step of:
detecting the power P of the hybrid motor 2 ；
When the power P of the hybrid motor 2 < second preset power P n And controlling the vehicle to give an alarm when the vehicle is in a state.
The application also provides a vehicle provided with an electric drive system for a vehicle as set forth in any one of the above, the vehicle further comprising a controller provided so as to be able to execute the control method of the electric drive system for a vehicle as set forth in any one of the above.
As will be appreciated by those skilled in the art, the electric drive system of the present application comprises a main drive motor, a hybrid motor, a first clutch and a second clutch, the vehicle comprises a mechanical compressor, one end of the first clutch is connected with a first output shaft of the hybrid motor, the second clutch is connected with a second output shaft of the hybrid motor, the other end of the first clutch is connected with the mechanical compressor, the other end of the second clutch is connected with a first wheel end output shaft of the vehicle, and the main drive motor is connected with a second wheel end output shaft of the vehicle; the first wheel end output shaft is one of a front wheel end output shaft or a rear wheel end output shaft of the vehicle, and the second wheel end output shaft is the other of the front wheel end output shaft or the rear wheel end output shaft.
Under the condition of adopting the technical scheme, the electric driving system of the application is provided with the hybrid motor and the main driving motor which are arranged on different wheel end output shafts and are respectively arranged as independent power supply systems, and the hybrid motor can provide power for a vehicle and a mechanical compressor. Specifically, when the power of the main driving motor is insufficient or the main driving motor fails completely, the second clutch is connected with the output shaft of the first wheel end, and the hybrid motor is independent of the main driving motor, so that when the main driving motor cannot provide enough power for the second wheel end, the hybrid motor can independently provide power for the first wheel end for running of the vehicle, and the problem that in the prior art, when the main driving motor fails, the whole vehicle power system fails is solved. When the vehicle needs thermal management, the air conditioning system is turned on, the mechanical compressor is turned on, and the hybrid motor independently provides power for the operation of the mechanical compressor when the first clutch is controlled to be engaged with the mechanical compressor. When the second clutch and the first clutch are simultaneously engaged, the hybrid motor can simultaneously provide power for the mechanical compressor and the vehicle to run, and the problem that an auxiliary motor in the prior art cannot simultaneously drive an air conditioner and provide power is solved.
The utility model provides an use optimally designed's hybrid motor, outside the basic function of acting for air condition compressor, can also provide basic auxiliary drive function, contain four drives and boost at the main motor during operation, and the drive redundancy function under the condition that the main motor became invalid, hybrid motor no longer regard as the charging device of main motor but as independent power supply system, and reach the purpose of optimizing electric drive system's work efficiency through the coupling device between reasonable configuration mechanical compressor, hybrid motor and the wheel end output shaft. Secondly, through the electric drive system that this patent provided, can optimize the suspension of hybrid motor, alleviate the NVH problem of compressor, through combining into one with assisting driving motor and compressor motor and dc-to-ac converter, reduce the occupation of vehicle space, can also effectively reduce the cost of whole electric drive system.
Drawings
Preferred embodiments of the present application are described below with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of an electric drive system of the present application;
FIG. 2 is a flow chart of steps of one embodiment of a method of controlling an electric drive system for a vehicle of the present application;
fig. 3 is a flowchart of steps of another embodiment of a control method of an electric drive system for a vehicle of the present application.
List of reference numerals:
1. a main drive motor; 2. a hybrid motor; 3. a first clutch; 4. a second clutch; 5. a mechanical compressor; 6. a first wheel end output shaft; 7. a second wheel end output shaft; 8. a reduction gearbox.
Detailed Description
Preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present application, and are not intended to limit the scope of the present application. Those skilled in the art can adapt it as desired to suit a particular application. For example, although the present application is described in connection with an electric vehicle, this is not limitative, and the electric drive system for a vehicle of the present application may be applied to other vehicles, for example, hybrid vehicles, engineering vehicles, etc., and may be applied to other devices other than vehicles that require an electric drive system.
It should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present application, unless explicitly specified and limited otherwise, the term "connected" should be interpreted broadly, and for example, may be a fixed connection, a removable connection, or a unitary connection; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those skilled in the art according to the specific circumstances.
As shown in fig. 1, in order to solve the problem that the electric drive system of the existing electric automobile causes the failure of the whole vehicle when the main drive motor fails, the electric drive system of the application comprises a main drive motor 1, a hybrid motor 2, a first clutch 3 and a second clutch 4, the vehicle comprises a mechanical compressor 5, one end of the first clutch 3 is connected with a first output shaft of the hybrid motor 2, the second clutch 4 is connected with a second output shaft of the hybrid motor 2, the other end of the first clutch 3 is connected with the mechanical compressor 5, the other end of the second clutch 4 is connected with a first wheel end output shaft 6 of the vehicle, and the main drive motor 1 is connected with a second wheel end output shaft 7 of the vehicle; wherein the first wheel end output shaft 6 is one of a front wheel end output shaft or a rear wheel end output shaft of the vehicle, and the second wheel end output shaft 7 is the other of the front wheel end output shaft or the rear wheel end output shaft. The first clutch 3 and the second clutch 4 may be friction plate type clutches or dog tooth type clutches, but the types of the first clutch 3 and the second clutch 4 are not limited, and the specific type may be selected according to the rotation speed range and the torque of the hybrid motor 2.
The above arrangement has the advantages that: the electric drive system of the application is provided with the hybrid motor 2 and the main drive motor 1 on different wheel end output shafts respectively as independent power supply systems, and the hybrid motor 2 can provide power for a vehicle and the mechanical compressor 5. Specifically, when the power of the main driving motor 1 is insufficient or the main driving motor is completely failed, the second clutch 4 is engaged with the first wheel end output shaft 6, and the hybrid motor 2 is independent of the main driving motor 1, so that when the main driving motor 1 cannot provide sufficient power for the second wheel end, the hybrid motor 2 can independently provide driving power for a vehicle, and the problem that in the prior art, when the main driving motor 1 fails, the whole vehicle power system fails is solved. When the air conditioning system is turned on and the mechanical compressor 5 is turned on and the first clutch 3 is controlled to engage with the mechanical compressor 5 when the thermal management of the vehicle is required, the hybrid motor 2 alone powers the operation of the mechanical compressor 5. When the second clutch 4 and the first clutch 3 are simultaneously engaged, the hybrid motor 2 can simultaneously provide power for the mechanical compressor 5 and the vehicle running, and the problem that an auxiliary motor in the prior art cannot simultaneously drive an air conditioner and provide power is solved.
The patent proposes to use optimally designed hybrid motor 2, besides the basic function of doing work for the air conditioner compressor, it is also able to provide basic auxiliary driving functions, including four drives and boost when the main driving motor 1 is working, and driving redundancy functions in case of failure of the main driving motor 1, the hybrid motor 2 is no longer used as a charging device of the main driving motor 1 but as an independent power supply system, and the purpose of optimizing the working efficiency of the electric driving system is achieved by reasonably configuring the coupling devices among the mechanical compressor 5, the hybrid motor 2 and the wheel end output shaft. Secondly, through the electric drive system that this patent provided, can optimize the suspension of hybrid motor 2, alleviate the NVH problem of compressor, through combining into one with assisting driving motor and compressor motor and dc-to-ac converter, reduce the occupation in vehicle space, can also effectively reduce the cost of whole electric drive system.
As shown in fig. 1, in one possible embodiment, the electric drive system further includes a reduction gearbox 8, where the reduction gearbox 8 is connected to the second clutch 4 and the first wheel end output shaft 6, respectively, and a third clutch (not shown in the figure) is further disposed between the main drive motor 1 and the second wheel end output shaft 7.
The above arrangement has the advantages that: a reduction gearbox 8 is arranged between the hybrid motor 2 and the first wheel end output shaft 6, and the speed range of the hybrid motor 2 is changed through the reduction gearbox 8 according to the speed requirement of the hybrid motor 2 under boost. A third clutch is arranged between the main drive motor 1 and the second wheel end output shaft 7, and whether the main drive motor 1 supplies power to the vehicle is controlled through the engagement or disengagement of the third clutch and the second wheel end output shaft 7.
In summary, the electric driving system of the present application provides power for the vehicle through the main driving motor 1 and the hybrid motor 2 which are independent from each other, and when the power of the main driving motor 1 is insufficient or fails, the hybrid motor 2 can directly provide power for the vehicle, and on the basis, the hybrid motor 2 can also provide power for the mechanical compressor 5, whereas the booster motor in the prior art can only provide power between the mechanical compressor 5 and the vehicle. According to the hybrid motor 2 disclosed by the application, the hybrid motor 2 is completely independent of the main drive motor 1, and the hybrid motor 2 can still drive a vehicle when the main drive motor 1 fails, so that the safety of the vehicle is improved, and the use experience of a user is improved.
The foregoing embodiments are merely illustrative of the principles of the present application, and are not intended to limit the scope of the application, as those skilled in the art can modify the above structure without departing from the principles of the present application, so that the present application can be applied to more specific application scenarios.
In addition, the present application also provides a control method of an electric drive system for a vehicle, referring to fig. 1, the vehicle includes a mechanical compressor 5, the electric drive system includes a main drive motor 1, a hybrid motor 2, a first clutch 3, and a second clutch 4, one end of the first clutch 3 is connected with a first output shaft of the hybrid motor 2, the second clutch 4 is connected with a second output shaft of the hybrid motor 2, the other end of the first clutch 3 is connected with the mechanical compressor 5, the other end of the second clutch 4 is connected with a first wheel end output shaft 6 of the vehicle, and the main drive motor 1 is connected with a second wheel end output shaft 7 of the vehicle; as shown in fig. 2, the control method includes:
step S01: detecting the power P of a main drive motor 1 ；
Step S021: when the power P of the main driving motor 1 < first preset power P 0 And when receiving a command for starting the mechanical compressor, controlling the first clutch to be engaged with the mechanical compressor, and controlling the second clutch to be engaged with the first wheel end output shaft so that the hybrid motor simultaneously supplies power for the first wheel end of the vehicle and the mechanical compressor.
In step S021, "when the power P of the main drive motor 1 < first preset power P 0 And when receiving the instruction of starting the mechanical compressor, "indicates that the main driving motor 1 cannot meet the power requirement of the vehicle, wherein the condition includes that the main driving motor 1 fails due to damage of external force, and simultaneously, when receiving the instruction of starting the mechanical compressor 5, the air conditioning system of the vehicle is started, and the mechanical compressor 5 needs to be started to provide a thermal management function for the vehicle, at the moment, the first clutch 3 is controlled to be engaged with the mechanical compressor 5, the second clutch 4 is controlled to be engaged with the first wheel end output shaft 6, and the hybrid motor 2 operates in a hybrid driving mode, namely, the hybrid motor 2 simultaneously provides power for the first wheel end of the vehicle and the mechanical compressor 5.
As shown in fig. 3, in a possible implementation manner, after step S021, the control method further includes:
step S03: detecting the power P of a hybrid motor 2 ；
Step S04: when the power P of the hybrid motor 2 < second preset power P n And controlling the vehicle to give an alarm.
The hybrid motor 2 simultaneously provides power for the first wheel end and the mechanical compressor 5 of the vehicle, the consumption of the power is more than that of the hybrid motor 2 provided for one of them alone, and by detecting the power of the hybrid motor 2, when the power of the hybrid motor 2 is too low, the vehicle is controlled to give an alarm, so that a user is reminded of insufficient power of the hybrid motor 2, and the user can select to turn off the air conditioner, so that the power of the hybrid motor 2 is completely used for running the vehicle, and the vehicle is prevented from being unable to run due to power shortage.
Referring to fig. 2, in a possible implementation manner, after step S01, the control method further includes:
step S022: when the power P of the main driving motor 1 Not less than the first preset power P 0 And when receiving an instruction for starting the mechanical compressor, controlling the first clutch to be engaged with the mechanical compressor, and controlling the second clutch to be separated from the first wheel end output shaft so as to enable the hybrid motor to independently provide power for the mechanical compressor.
Step S023: when the power P of the main driving motor 1 < first preset power P 0 And when receiving a command of not starting the mechanical compressor, controlling the first clutch to be separated from the mechanical compressor, and controlling the second clutch to be engaged with the first wheel end output shaft so as to enable the hybrid motor to independently supply power for the first wheel end of the vehicle.
Step S024: when the power P of the main driving motor 1 Not less than the first preset power P 0 And when receiving an instruction of not starting the mechanical compressor, controlling the first clutch to be separated from the mechanical compressor, and controlling the second clutch to be separated from the first wheel end output shaft so as to enable the hybrid motor to be in a standby state.
In step S022, "when power P of main drive motor 1 Not less than the first preset power P 0 When receiving the instruction for starting the mechanical compressor, the power of the main driving motor 1 can meet the power requirement of the vehicle, the vehicle does not need additional driving force, meanwhile, the instruction for starting the mechanical compressor 5 is received, the air conditioning system of the vehicle is started, the mechanical compressor 5 is required to be started for providing refrigeration or heating for the vehicle, the first clutch 3 is controlled to be connected with the mechanical compressor 5, the second clutch 4 is controlled to be separated from the first wheel end output shaft 6, the hybrid motor is operated in the air conditioning compressor mode, and the hybrid power is supplied to the vehicleThe machine alone powers the mechanical compressor 5.
In step S023, "when power P of main drive motor 1 < first preset power P 0 And when receiving the instruction of not starting the mechanical compressor ", it indicates that the main driving motor 1 cannot meet the power requirement of the vehicle, meanwhile, the vehicle has no thermal management requirement, the air conditioning system is not turned on, the mechanical compressor 5 is not operated, the second clutch 4 is controlled to be engaged with the first wheel end output shaft 6, the hybrid motor 2 operates in a driving motor mode, and the hybrid motor 2 independently provides power for the first wheel end of the vehicle.
In step S024, "when power P of main drive motor 1 Not less than the first preset power P 0 And when receiving the command of not starting the mechanical compressor, "means that the power of the main driving motor 1 can meet the power requirement of the vehicle, the vehicle does not need additional driving force, meanwhile, the vehicle does not have thermal management requirement, the air conditioning system is not opened, the mechanical compressor 5 is not operated, the first clutch 3 is controlled to be separated from the mechanical compressor 5, and the second clutch 4 is controlled to be separated from the first wheel end output shaft 6, so that the hybrid motor 2 is in a standby state.
In order to achieve the operating conditions described in the above steps, the parameters of the hybrid electric machine 2 are optimized in the following. Assuming that the design target of the vehicle is M tons, the normal running speed range is 0-V h Kilometers per hour, wherein the hybrid motor 2 can provide a boost with a travel speed in the range of 0-V b Kilometers per hour, where V b <V h The method comprises the steps of carrying out a first treatment on the surface of the The speed range V of the hybrid electric machine 2 under boost conditions can be deduced b And maximum power P b A need.
In the event of failure of the main drive motor 1, the vehicle travel speed ranges from 0 to V l Kilometers per hour, and 0-V l Acceleration requirement is T l Second, and the ramp rate of A degrees can be satisfied, from which it can be deduced that in the drive motor mode the speed range of the hybrid motor 2 is 0-V d And maximum power P d Requirements. Thirdly, according to the design requirement of the vehicle thermal energy management system, the rotating speed range 0-V in the air conditioner compressor mode is designated c And maximum power P c Requirements.
Secondly, in hybrid drive mode, the hybrid electric machine 2 applies work to both the mechanical compressor 5 and the wheels, and under this condition, the hybrid electric machine 2 needs to drive the mechanical compressor 5 to provide minimum thermal management requirements while guaranteeing the basic dynamic performance of the vehicle, at which time the power of the mechanical compressor 5 is P d +P c_min . Then according to V b 、V c 、V d Finally, the maximum rotational speed V of the hybrid motor 2 is set m According to the range of P b 、P c 、P d +P c_min The maximum power of (2) is set to the power P of the hybrid motor m . Within a defined rotational speed and power range, the design parameters of the hybrid electric machine 2 are optimized as a function of the specific operating conditions of the mechanical compressor 5, and an optimum efficiency of the hybrid electric machine 2 is sought in the case of a compressor motor.
In addition, the application also provides a vehicle provided with the electric drive system for a vehicle according to any one of the above embodiments, and the vehicle further includes a controller configured to be able to execute the control method for the electric drive system for a vehicle according to any one of the above embodiments.
Thus far, the technical solution of the present application has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present application is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present application, and such modifications and substitutions will fall within the scope of the present application.

Claims (9)

1. A control method of an electric drive system for a vehicle, characterized in that the vehicle includes a mechanical compressor, the electric drive system includes a main drive motor, a hybrid motor, a first clutch, and a second clutch, one end of the first clutch is connected with a first output shaft of the hybrid motor, the second clutch is connected with a second output shaft of the hybrid motor, the other end of the first clutch is connected with the mechanical compressor, the other end of the second clutch is connected with a first wheel end output shaft of the vehicle, and the main drive motor is connected with a second wheel end output shaft of the vehicle; the first wheel end output shaft is one of a front wheel end output shaft or a rear wheel end output shaft of the vehicle, and the second wheel end output shaft is the other of the front wheel end output shaft or the rear wheel end output shaft; the control method comprises the following steps:
detecting the power P of the main drive motor 1 ；
When the power P of the main driving motor 1 < first preset power P 0 And when receiving a command for starting the mechanical compressor, controlling the first clutch to be engaged with the mechanical compressor, and controlling the second clutch to be engaged with the first wheel end output shaft so that the hybrid motor simultaneously supplies power for the first wheel end of the vehicle and the mechanical compressor.
2. The control method for an electric drive system of a vehicle according to claim 1, characterized by "detecting the power P of the main drive motor 1 After the step of "the control method further includes:
when the power P of the main driving motor 1 Not less than the first preset power P 0 And when receiving an instruction for starting the mechanical compressor, controlling the first clutch to be engaged with the mechanical compressor, and controlling the second clutch to be separated from the first wheel end output shaft so that the hybrid motor independently provides power for the mechanical compressor.
3. The control method for an electric drive system of a vehicle according to claim 1, characterized by "detecting the power P of the main drive motor 1 After the step of "the control method further includes:
when the power P of the main driving motor 1 < first preset power P 0 When receiving a command for not starting the mechanical compressor, controlling the first clutch to be separated from the mechanical compressor, and controlling the second clutchThe engine is coupled to the first wheel end output shaft such that the hybrid electric machine alone powers the first wheel end of the vehicle.
4. The control method for an electric drive system of a vehicle according to claim 1, characterized by "detecting the power P of the main drive motor 1 After the step of "the control method further includes:
when the power P of the main driving motor 1 Not less than the first preset power P 0 And when receiving an instruction of not starting the mechanical compressor, controlling the first clutch to be separated from the mechanical compressor, and controlling the second clutch to be separated from the first wheel end output shaft so as to enable the hybrid motor to be in a standby state.
5. The control method for the electric drive system of the vehicle according to claim 1, characterized in that when the power P of the main drive motor is 1 < first preset power P 0 And upon receiving a command to start the mechanical compressor, controlling the first clutch to engage the mechanical compressor, controlling the second clutch to engage the first wheel end output shaft such that the hybrid electric machine simultaneously powers the first wheel end of the vehicle and the mechanical compressor, the control method further includes:
detecting the power P of the hybrid motor 2 ；
When the power P of the hybrid motor 2 < second preset power P n And controlling the vehicle to give an alarm when the vehicle is in a state.
6. The control method for an electric drive system of a vehicle according to claim 1, characterized in that the electric drive system further comprises a reduction gearbox (8), the reduction gearbox (8) being connected to the second clutch (4) and the first wheel end output shaft (6), respectively.
7. The control method for an electric drive system of a vehicle according to claim 1, characterized in that the first clutch (3) and the second clutch (4) are of the friction plate type or dog clutch type.
8. The control method for an electric drive system of a vehicle according to claim 1, characterized in that a third clutch is provided between the main drive motor (1) and the second wheel end output shaft (7).
9. A vehicle provided with an electric drive system for a vehicle as claimed in any one of claims 1, 6, 7, 8, the vehicle further comprising a controller arranged to be able to perform the control method of an electric drive system for a vehicle as claimed in any one of claims 1-5.
CN202210190193.6A 2022-02-28 2022-02-28 Electric drive system for vehicle, control method thereof and vehicle Active CN114506198B (en)

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