CN114506198A - 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
CN114506198A
CN114506198A CN202210190193.6A CN202210190193A CN114506198A CN 114506198 A CN114506198 A CN 114506198A CN 202210190193 A CN202210190193 A CN 202210190193A CN 114506198 A CN114506198 A CN 114506198A
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Prior art keywords
vehicle
clutch
output shaft
power
motor
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CN202210190193.6A
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Chinese (zh)
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CN114506198B (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 invention relates to the technical field of vehicles, and particularly provides an electric drive system for a vehicle, a control method of the electric drive system and the vehicle. In order to solve the problem that the whole electric vehicle fails when a main drive motor of an electric drive system of the conventional electric vehicle fails, the electric drive system comprises the main drive motor, a hybrid motor, a first clutch and a second clutch, wherein 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 the second wheel end output shaft of the vehicle. The hybrid motor and the main drive motor are independent power supply systems, the hybrid motor can provide power for the vehicle and the mechanical compressor at the same time, the NVH problem of the compressor is reduced, the vehicle space occupation 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 invention relates to the technical field of vehicles, and particularly provides an electric drive system for a vehicle, a control method of the electric drive system and the vehicle.
Background
With the development of technology, electric vehicles are more and more favored by consumers. The electric automobile in the prior art is simultaneously provided with a main drive motor, an auxiliary drive motor and a compressor motor, wherein the main drive 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 drive motor is cooperated with the main drive to provide boost (assistance); the compressor motor powers the compressor to meet the vehicle thermal management needs. However, as the thermal management requirements of the vehicle are increased, the electronic air-conditioning compressor is relatively large, so that the overall volume of the compressor motor is increased, the compressor motor is difficult to adapt to increasingly tense vehicle space, and as the power and the rotating speed of the compressor are increased, the problem of NVH (noise, vibration and harshness) caused by the compressor is increasingly serious. Patent document No. CN1927610A describes that two ends of a power assisting motor are connected to a compressor and a main drive system through a one-way clutch respectively, and the power assisting motor is connected to the main drive system in series, so that the power assisting motor of the electric drive system supplements 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 and fails, although the power assisting motor can transmit power to the main drive motor, the main drive motor cannot drive the vehicle to run under the condition of failure, and further the capability of the vehicle in extreme conditions is seriously affected. In addition, the power-assisted motor can only supply power for one of the main drive motor and the compressor, the arrangement of the whole electric drive system is unreasonable, and 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 that solves the problem of the existing electric vehicle electric drive system causing failure of the entire vehicle when the main drive motor fails.
Disclosure of Invention
The invention aims to solve the technical problem, namely, the problem that the electric drive system of the existing electric automobile causes the failure of the whole automobile when a main drive motor fails is solved.
In a first aspect, the present invention provides an electric drive system for a vehicle, the vehicle including a mechanical compressor, the electric drive system including 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 the above preferred technical solution of the electric drive system for a vehicle, the electric drive system further includes a reduction gearbox, and the reduction gearbox is connected with the second clutch and the first wheel end output shaft, respectively.
In the above-described preferred embodiment of the electric drive system for a vehicle, the first clutch and the second clutch are of the friction plate clutch or dog-tooth clutch type.
In the above-described 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 invention also provides a control method of an electric drive system for a vehicle, wherein 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 motor1；
When the power P of the main drive motor1< first predetermined Power P0And when an instruction for starting the mechanical compressor is received, the first clutch is controlled to be connected with the mechanical compressor, and the second clutch is controlled to be connected with the first wheel end output shaft, so that the hybrid motor can simultaneously provide power for the first wheel end of the vehicle and the mechanical compressor.
In a preferred embodiment of the above-described control method for an electric drive system of a vehicle, "detecting the power P of the main drive motor1"the control method further includes, after the step of:
when the power P of the main drive motor1Not less than the first preset power P0And when an instruction for starting the mechanical compressor is received, the first clutch is controlled to be connected with the mechanical compressor, and the second clutch is controlled to be separated from the first wheel end output shaft, so that the hybrid motor can independently provide power for the mechanical compressor.
In a preferred embodiment of the above-described control method for an electric drive system of a vehicle, "detecting the power P of the main drive motor1"the control method further includes, after the step of:
when the power P of the main drive motor1< first predetermined Power P0And when an instruction of not starting the mechanical compressor is received, the first clutch is controlled to be separated from the mechanical compressor, and the second clutch is controlled to be connected with the first wheel end output shaft, so that the hybrid motor alone provides power for the first wheel end of the vehicle.
In a preferred embodiment of the above-described control method for an electric drive system of a vehicle, "detecting the power P of the main drive motor1"the control method further includes, after the step of:
when the power P of the main drive motor1Not less than the first preset power P0And controlling the first separator when receiving an instruction not to start the mechanical compressorThe clutch is separated from the mechanical compressor, and the second clutch is controlled to be separated from the first wheel end output shaft, so that the hybrid motor is in a standby state.
In a preferred embodiment of the above control method for an electric drive system of a vehicle, the "power P of the main drive motor is measured1< first predetermined Power P0And after the step of controlling the first clutch to engage with the mechanical compressor and controlling the second clutch to engage with the first wheel-end output shaft so that the hybrid motor simultaneously powers the first wheel end of the vehicle and the mechanical compressor when receiving a command to start the mechanical compressor, the control method further comprises:
detecting the power P of the hybrid motor2；
When the power P of the hybrid motor2< second predetermined power PnAnd controlling the vehicle to alarm.
The invention also provides a vehicle provided with the electric drive system for a vehicle of any one of the above-described items, the vehicle further including a controller configured to be able to execute the control method for the electric drive system for a vehicle of any one of the above-described items.
As can be understood by those skilled in the art, the electric drive system of the present invention includes a main drive motor, a hybrid motor, a first clutch and a second clutch, the vehicle includes 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 hybrid motor and the main drive motor 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 drive motor is insufficient or completely fails, the second clutch is connected with the output shaft of the first wheel end, and the hybrid motor is independent of the main drive motor, so that when the main drive motor cannot provide enough power for the second wheel end, the hybrid motor can independently provide the power for the vehicle to run for the first wheel end, and the problem that the power system of the whole vehicle fails when the main drive motor fails in the prior art is solved. When the vehicle needs thermal management, the air conditioning system is started, the mechanical compressor is started, and the hybrid motor independently provides power for the operation of the mechanical compressor when the first clutch is controlled to be connected 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 the auxiliary motor in the prior art cannot simultaneously drive the air conditioner and provide power is also solved.
This patent proposes the hybrid motor who uses optimal design, outside the basic function for air condition compressor acting, can also provide basic auxiliary drive function, contain four-wheel drive and boost when main drive motor work, and drive redundancy function under the condition that main drive motor became invalid, hybrid motor no longer is as the charging device of main drive motor but as independent power supply system, and reach the purpose of optimizing electric drive system's work efficiency through the coupling device between rational configuration mechanical compressor, hybrid motor and the wheel end output shaft. Secondly, through the electric drive system that this patent provided, can optimize hybrid motor's suspension, alleviate the NVH problem of compressor, through will assist two into one of driving motor and compressor motor and dc-to-ac converter, reduce the occupation of vehicle space, can also effectively reduce whole electric drive system's cost.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of the electric drive system of the present invention;
FIG. 2 is a flow chart of steps of one embodiment of a control method of the present invention for an electric drive system of a vehicle;
fig. 3 is a flowchart of the steps of another embodiment of a control method of the present invention for an electric drive system of a vehicle.
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 invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications. For example, although the present application is described in conjunction with an electric vehicle, this is not limitative, and the electric drive system for a vehicle of the present invention may be applied to other vehicles, such as hybrid vehicles, construction vehicles, and the like, and may also 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 invention, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1, in order to solve the problem that the electric drive system of the existing electric vehicle causes failure of the whole vehicle when the main drive motor fails, the electric drive system of the present invention includes a main drive motor 1, a hybrid motor 2, a first clutch 3 and a second clutch 4, the vehicle includes 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, the main drive motor 1 is connected with a second wheel end output shaft 7 of the vehicle; 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 clutches or dog-tooth 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 setting mode has the advantages that: the electric drive system of the invention is characterized in that the hybrid motor 2 and the main drive motor 1 are arranged on different wheel end output shafts and are respectively arranged as independent power supply systems, and the hybrid motor 2 can provide power for vehicles and the mechanical compressor 5. Specifically, when the power of the main drive motor 1 is insufficient or completely fails, the second clutch 4 is engaged with the first wheel end output shaft 6, and the hybrid motor 2 is independent of the main drive motor 1, so that when the main drive motor 1 cannot provide enough power for the second wheel end, the hybrid motor 2 can independently provide driving power for the vehicle, and the problem that the power system of the whole vehicle fails when the main drive motor 1 fails in the prior art is solved. When the vehicle needs thermal management, the air conditioning system is started, the mechanical compressor 5 is started, and the first clutch 3 is controlled to be connected with the mechanical compressor 5, so that the hybrid motor 2 solely provides power for the operation of the mechanical compressor 5. When the second clutch 4 and the first clutch 3 are engaged at the same time, the hybrid motor 2 can provide power for the mechanical compressor 5 and the vehicle running at the same time, and the problem that the auxiliary motor in the prior art cannot drive the air conditioner and provide power at the same time is also solved.
This patent proposes to use hybrid motor 2 of optimal design, outside the basic function for the air condition compressor work, can also provide basic auxiliary drive function, contain four-wheel drive and boost when main drive motor 1 is worked, and drive redundancy function under the condition of main drive motor 1 inefficacy, hybrid motor 2 no longer is as the charging device of main drive motor 1 but as independent power supply system, and reach the purpose of optimizing electric drive system's work efficiency through the coupling device between rational configuration mechanical compressor 5, hybrid motor 2 and the wheel end output shaft. Secondly, through the electric drive system that this patent provided, can optimize hybrid motor 2's suspension, alleviate the NVH problem of compressor, through will assist two into one of uniting of driving motor and compressor motor and dc-to-ac converter, reduce the occupation of vehicle space, can also effectively reduce whole electric drive system's cost.
As shown in fig. 1, in a possible embodiment, the electric drive system further includes a reduction gearbox 8, 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) is further disposed between the main drive motor 1 and the second wheel end output shaft 7.
The setting mode has the advantages that: a reduction box 8 is arranged between the mixing motor 2 and the first wheel end output shaft 6, and the speed range of the mixing motor 2 is changed through the reduction box 8 according to the speed requirement of the mixing motor 2 under boost. A third clutch is arranged between the main driving motor 1 and the second wheel end output shaft 7, and whether the main driving motor 1 provides power for the vehicle or not is controlled through the connection or the disconnection of the third clutch and the second wheel end output shaft 7.
In summary, the electric drive system of the present invention provides power for the vehicle through the independent main drive motor 1 and the independent hybrid motor 2, and the hybrid motor 2 can directly provide power for the vehicle when the main drive motor 1 is insufficient or fails, and on the basis, the hybrid motor 2 can also provide power for the mechanical compressor 5, whereas the prior art power assisting motor can only provide power for selecting between the mechanical compressor 5 and the vehicle. The hybrid motor 2 is completely independent of the main drive motor 1, and the hybrid motor 2 can still drive the 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.
As mentioned in the first paragraph of this section, the above embodiments are only used for illustrating the principle of the present invention, and are not intended to limit the protection scope of the present invention, and those skilled in the art can make modifications to the above structures so that the present invention can be applied to more specific application scenarios without departing from the principle of the present invention.
In addition, the invention also provides a control method of an electric drive system for a vehicle, referring to fig. 1, the vehicle comprises a mechanical compressor 5, the electric drive system comprises 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 power P of main drive motor1；
Step S021: when power P of main drive motor1< first predetermined Power P0And when receiving the instruction of starting the mechanical compressor, controlling the first clutch to be jointed with the mechanical compressor, and controlling the second clutch to be jointed with the output shaft of the first wheel end, so that the hybrid motor can simultaneously provide power for the first wheel end of the vehicle and the mechanical compressor.
In step S021, "power P of main drive motor1< first predetermined Power P0And when receiving an instruction for starting the mechanical compressor, "it indicates that the main drive motor 1 cannot meet the power requirement of the vehicle, including a case where the main drive motor 1 fails due to external damage, and meanwhile, receiving an instruction for starting the mechanical compressor 5 indicates that an air conditioning system of the vehicle is turned on, and the mechanical compressor 5 needs to be started to provide a thermal management function for the vehicle, at this time, 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 drive mode, that is, 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 embodiment, after step S021, the control method further includes:
step S03: detecting the power P of a hybrid electric machine2；
Step S04: when power P of the hybrid motor2< second predetermined power PnAnd controlling the vehicle to alarm.
Hybrid motor 2 provides power for the first wheel end and the mechanical compressor 5 of vehicle simultaneously, and the consumption of power is more than providing power for one of them alone, through the power that detects hybrid motor 2, when hybrid motor 2's power is low excessively, controls the vehicle and reports to the police, reminds user hybrid motor 2's power not enough, and the user can select to close the air conditioner to make hybrid motor 2's power be used for the operation of vehicle completely, prevent that the vehicle can't advance because of the lack of electricity.
Referring to fig. 2, in a possible implementation, after step S01, the control method further includes:
step S022: when power P of main drive motor1Not less than the first preset power P0And when an instruction for starting the mechanical compressor is received, the first clutch is controlled to be connected with the mechanical compressor, and the second clutch is controlled to be separated from the first wheel end output shaft, so that the hybrid motor can independently provide power for the mechanical compressor.
Step S023: when power P of main drive motor1< first predetermined Power P0And when an instruction of not starting the mechanical compressor is received, the first clutch is controlled to be separated from the mechanical compressor, and the second clutch is controlled to be connected with the output shaft of the first wheel end, so that the hybrid motor alone provides power for the first wheel end of the vehicle.
Step S024: when power P of main drive motor1Not less than the first preset power P0And when an instruction of not starting the mechanical compressor is received, the first clutch is controlled to be separated from the mechanical compressor, and the second clutch is controlled to be separated from the first wheel end output shaft, so that the hybrid motor is in a standby state.
In step S022, "power P of the main drive motor1Not less than first preset power P0And when receiving a command for starting the mechanical compressor ", it indicates the work of the main drive motor 1The power demand of the vehicle can be met, the vehicle does not need extra driving force, meanwhile, an instruction for starting the mechanical compressor 5 is received, the air conditioning system of the vehicle is turned on, the mechanical compressor 5 needs to be started to provide cooling 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 operates the air conditioning compressor mode, and the hybrid motor independently provides power for the mechanical compressor 5.
In step S023, the power P of the main drive motor1< first predetermined Power P0And when an instruction of not starting the mechanical compressor is received, the instruction indicates that the main drive motor 1 cannot meet the power requirement of the vehicle, meanwhile, the vehicle has no thermal management requirement, the air conditioning system is not started, the mechanical compressor 5 does not operate, the second clutch 4 is controlled to be connected with the first wheel end output shaft 6, the hybrid motor 2 operates in a driving motor mode, and the hybrid motor 2 alone provides power for the first wheel end of the vehicle.
In step S024, power P of main drive motor1Not less than the first preset power P0And when an instruction of not starting the mechanical compressor is received, "it indicates that the power of the main drive motor 1 can meet the power requirement of the vehicle, the vehicle does not need additional driving force, and meanwhile, the vehicle does not have a thermal management requirement, the air conditioning system is not turned on, the mechanical compressor 5 does not operate, 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 motor 2 are optimized as follows. Assuming that the design target of the vehicle is M tons, the speed range of normal running is 0-VhKilometer per hour, wherein the hybrid motor 2 can provide a boost travel speed in the range of 0-VbKilometer per hour, wherein, Vb<Vh(ii) a The speed range V of the hybrid electric machine 2 under boost operating conditions can be derivedbAnd maximum power PbAnd (4) demand.
In the event of failure of the main drive motor 1, the vehicle travel speed range is 0-VlKilometer per hour, and0-Vlacceleration requirement of TlSecond, and can satisfy the uphill rate of a degrees, from which it can be deduced that the speed range of the hybrid motor 2 is 0-V in the driving motor modedAnd maximum power PdAnd (4) requiring. Thirdly, according to the design requirements of the vehicle thermal energy management system, the rotating speed range of 0-V under the mode of the air conditioner compressor is appointedcAnd maximum power PcAnd (4) requiring.
Secondly, in the hybrid driving mode, the hybrid motor 2 applies work to the mechanical compressor 5 and the wheels at the same time, and under the working condition, the hybrid motor 2 provides the lowest thermal management requirement for driving the mechanical compressor 5 while ensuring the basic dynamic performance of the vehicle, and at the moment, the power of the mechanical compressor 5 is Pd+Pc_min. Then according to Vb、Vc、VdThe middle maximum rotating speed finally sets the rotating speed V of the hybrid motor 2mAccording to Pb、Pc、Pd+Pc_minThe power P of the hybrid motor 2 is set to the middle maximum powerm. Within the limited rotating speed and power range, the design parameters of the hybrid motor 2 are optimized according to the specific working conditions of the mechanical compressor 5, and the optimal efficiency of the hybrid motor 2 serving as a compressor motor is pursued.
Furthermore, the invention also provides a vehicle provided with the electric drive system for a vehicle of any of the above embodiments, the vehicle further comprising a controller configured to execute the control method for the electric drive system for a vehicle of any of the above embodiments.
So far, the technical solutions of the present invention have 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 the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (10)

1. 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.
2. The electric drive system for a vehicle of claim 1 further comprising a reduction gearbox coupled to the second clutch and the first wheel end output shaft, respectively.
3. The electric drive system for a vehicle of claim 1, wherein the first clutch and the second clutch are of the type of friction plate clutch or dog tooth clutch.
4. The electric drive system for a vehicle of claim 1, wherein a third clutch is disposed between said main drive motor and said second wheel end output shaft.
5. A control method for an electric drive system of 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 to a first output shaft of the hybrid motor, the second clutch is connected to a second output shaft of the hybrid motor, the other end of the first clutch is connected to the mechanical compressor, the other end of the second clutch is connected to a first wheel-end output shaft of the vehicle, and the main drive motor is connected to a second wheel-end output shaft of the vehicle; the control method comprises the following steps:
detecting the power P of the main drive motor1；
When the power P of the main drive motor1< first predetermined Power P0And when an instruction for starting the mechanical compressor is received, the first clutch is controlled to be connected with the mechanical compressor, and the second clutch is controlled to be connected with the first wheel end output shaft, so that the hybrid motor can simultaneously provide power for the first wheel end of the vehicle and the mechanical compressor.
6. Control method of an electric drive system for a vehicle according to claim 5, characterized in that "detecting the power P of the main drive motor1"the control method further includes, after the step of:
when the power P of the main drive motor1Not less than the first preset power P0And when an instruction for starting the mechanical compressor is received, the first clutch is controlled to be connected with the mechanical compressor, and the second clutch is controlled to be separated from the first wheel end output shaft, so that the hybrid motor can independently provide power for the mechanical compressor.
7. Control method of an electric drive system for a vehicle according to claim 5, characterized in that "detecting the power P of the main drive motor1"the control method further includes, after the step of:
when the power P of the main drive motor1< first predetermined Power P0And when an instruction of not starting the mechanical compressor is received, the first clutch is controlled to be separated from the mechanical compressor, and the second clutch is controlled to be connected with the first wheel end output shaft, so that the hybrid motor alone provides power for the first wheel end of the vehicle.
8. According to claim 5The control method for an electric drive system of a vehicle is characterized in that the power P of the main drive motor is detected1"the control method further includes, after the step of:
when the power P of the main drive motor1Not less than the first preset power P0And when an instruction of not starting the mechanical compressor is received, the first clutch is controlled to be separated from the mechanical compressor, and the second clutch is controlled to be separated from the first wheel end output shaft, so that the hybrid motor is in a standby state.
9. The control method of an electric drive system for a vehicle according to claim 5, characterized in that "when the power P of the main drive motor is1< first predetermined Power P0And after the step of controlling the first clutch to engage with the mechanical compressor and controlling the second clutch to engage with the first wheel-end output shaft so that the hybrid motor simultaneously powers the first wheel end of the vehicle and the mechanical compressor when receiving a command to start the mechanical compressor, the control method further comprises:
detecting the power P of the hybrid motor2；
When the power P of the hybrid motor2< second predetermined power PnAnd controlling the vehicle to alarm.
10. A vehicle, characterized in that the vehicle is provided with an electric drive system for a vehicle of any one of claims 1-4, the vehicle further comprising a controller arranged to be able to execute the control method for an electric drive system for a vehicle of any one of claims 4-9.
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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