CN103359116B - A kind of dynamic property economy shift control method of pure electric automobile and system - Google Patents
A kind of dynamic property economy shift control method of pure electric automobile and system Download PDFInfo
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Abstract
The present invention proposes dynamic property economics step control method and the system of a kind of pure electric automobile. This system comprises entire car controller, gearshift device, accelerator pedal, brake pedal, drive motor controller and power cell controller. According to the gearshift shift signal of device, accelerator pedal aperture signal, brake pedal switch signal and speed of a motor vehicle signal etc., entire car controller judges that vehicle is in power and travels state or economic traveling state, drive, brake or sliding state, and formulate corresponding torque calculation strategy, gather the signals such as gearshift device fault, accelerator pedal fault, the fault of drive motor controller feedback, the fault of power cell controller feedback simultaneously, carrying out trouble diagnosis, the final target torque control vehicle power that sends exports. The present invention while meeting vehicles dynamic performance target, can reduce system energy consumption rate, it is to increase whole car continual mileage by the switching of gear.
Description
Technical field
The present invention relates to automotive power control techniques field, in particular to pure electric vehicle power system control technique.
Background technology
Along with the scarcity gradually of whole world petroleum resources and the day by day outstanding of environmental problem, pure electric automobile progressively marches toward the industrialization stage with its advantage such as lower noise, zero release, and comprehensive raising of the performances such as dynamic property, economy, control stability, the comfortable property of driving is also more and more tended in the concern of its performance by correlative study from the realization of simple driving functions.
Power drive system many employings drive-motor of current pure electric automobile is in conjunction with the structure formation of single-stage speed reducing device, and only arranges a power gear arranging of gear of driving, meets the requirement of vehicle movement. Though this mode can meet the performance index such as whole car max. speed, pick-up period, max. climb slope, but the utilization to the efficient district of power system is often ignored, especially when vehicle high speed travels, whole car standby power is excessive, cause the waste of power system power, energy consumption rate is bigger than normal, affects whole car continual mileage, it is difficult to take into account the target of power performance and economy.
Summary of the invention
It is an object of the invention to, dynamic property economy shift control method and the system of a kind of pure electric automobile are proposed, the power that pure electric automobile exports can be regulated by this system and control method, while meeting max. climb slope, max. speed, pick-up period equidynamic requirement, the consumption of whole car energy can be reduced, improve energy recovery rate, effectively increase whole car continual mileage.
The technical scheme of present method is as follows, includes following step:
Step 1) entire car controller, according to gearshift device shifting state, judges that current shift is power gear or economics step. Wherein under power gear, vehicle can obtain faster acceleration, torque response is fast, gradeability is strong, meets the power demand of officer; Under economics step, vehicle can utilize the efficient district of motor better, it is to increase the efficiency for charge-discharge of power cell, and utilizes electric braking to carry out energy recovery more, meets the economic performance of whole car.
Step 2) entire car controller according to corresponding gear, accelerator pedal aperture and in real time the speed of a motor vehicle search officer's MAP, namely accelerator pedal aperture-speed of a motor vehicle-driving torque relationship figure, obtains target drive torque. The wherein corresponding dynamic property officer's MAP of power gear, the corresponding economy officer's MAP of economics step, dynamic property officer's MAP compares economy officer's MAP, in accelerator pedal (4) is during low aperture, has bigger torque and exports.
According to brake pedal status, step 3) entire car controller judges whether whole car is braked, if the braking mode of being in, search Brake energy recovery MAP, i.e. the speed of a motor vehicle-braking electric braking torque relationship figure, obtain target braking and reclaim torque, and be sent to drive motor controller by CAN. Wherein Brake energy recovery MAP is determined according to gear, the corresponding dynamic property Brake energy recovery MAP of power gear, the corresponding economy Brake energy recovery MAP of economics step, economy Brake energy recovery MAP compares dynamic property Brake energy recovery MAP, has bigger braking electricity torque and exports.
Step 4) is in step 3), if brake pedal is in non-brake state, and entire car controller detects that accelerator pedal aperture is zero simultaneously, search and slide energy recovery MAP, the i.e. speed of a motor vehicle-slide electric braking torque relationship figure, obtain target and slide recovery torque, and be sent to drive motor controller by CAN. Wherein slide energy recovery MAP to determine according to gear, the corresponding dynamic property of power gear slides energy recovery MAP, the corresponding economy of economics step slides energy recovery MAP, economy slides energy recovery and compares dynamic property and slide energy recovery MAP, has bigger sliding brake function electricity torque and exports.
Step 5) is in step 3), if brake pedal is in non-brake state, and entire car controller detects that accelerator pedal aperture is greater than zero simultaneously, then according to step 2) target drive torque that obtains is sent to drive motor controller by CAN.
6) in step 3)-5) in, during the fault driven when there is impact or brake, such as the fault etc. that accelerator pedal fault, gearshift device fault, the fault of drive motor controller transmission, power cell controller send, entire car controller differentiates, target drive torque is set to zero, is sent to drive motor controller by CAN.
Realize the Controlling System of above-mentioned control method, comprising:
Entire car controller: receive operator information and the car status information such as accelerator pedal signal, brake pedal signal and gearshift device signal, judge that vehicle is in power and travels state or economic traveling state, driving state, braking mode or sliding state, obtain corresponding target torque, it is sent in CAN.
Gearshift device: can carry out driving, fall back, parking, the gear such as neutral selection, especially there is at the gear of driving part the selection of power gear and economics step, and all shift signals and gear fault fed back to entire car controller.
Accelerator pedal: the wish that traveling can be driven by the change reflection officer of pedal aperture, and pedal opening signal and pedal trouble signal are fed back to entire car controller.
Brake pedal: by the demand of the switch state reflection operator brake vehicle of brake pedal, and brake switch signal can be fed back to entire car controller.
Drive motor controller: receive the information such as the target torque in CAN, the actions such as the torque change of control drive-motor, and the failure message of drive-motor is sent in CAN.
Power cell controller: control power cell carries out charging and discharging, is sent in CAN by the failure message of power cell.
It is an advantage of the current invention that:
The present invention is not when changing the existing power system structure of pure electric automobile, gear is driven by arranging power gear and economics step two, and power gear and the switching of economic gear is realized by full-vehicle control, max. speed, acceleration characteristics, climbable gradient equidynamic requirement can either be met, whole power system can be made again to be operated in efficient district, improve system efficiency, reduce energy expenditure, promote the economy of whole car.
Test proves: the present invention can meet whole car dynamic performance index and economic performance index, and effectively promotes whole car continual mileage, reaches the object of expection.
Accompanying drawing explanation
Fig. 1 is the dynamic property of pure electric automobile economy gear control structure block diagram of the present invention.
Fig. 2 is the pure electric vehicle power shift control method flow diagram of the present invention.
Fig. 3 is the pure electric automobile economics step control method flow diagram of the present invention.
Embodiment:
By reference to the accompanying drawings the dynamic property of pure electric automobile economy shift control system of the present invention is specifically described.
As shown in Figure 1, native system comprises entire car controller 1, gearshift device 2, accelerator pedal 3, brake pedal 4, drive motor controller 5 and power cell controller 6. The wherein shift signal of entire car controller 1 reception gearshift device 2, the aperture signal of accelerator pedal 3 and the switch signal etc. of brake pedal 4, judges that dynamic property/economy of vehicle travels state, and makes corresponding decision-making, obtain target torque and be sent in CAN. Drive motor controller 5 receives the target torque information in CAN, and the torque of control drive-motor carries out respective change. When generation affects the fault of driving or braking, such as the fault of accelerator pedal fault, gearshift device fault, drive motor controller 5 transmission, the fault etc. of power cell controller 6 transmission, it is zero that entire car controller 1 controls vehicle torque output.
As shown in Figure 2 or Figure 3, the workflow of system is: the signal determining that entire car controller sends according to gearshift device is currently power gear or economics step, if power gear, search the officer's MAP under power gear, it is greater than zero and do not have torque failure to deposit in case in accelerator pedal aperture, exports and drive torque; At brake pedal and do not have torque and recovery failure to deposit in case, export Brake energy recovery torque; Accelerator pedal aperture be zero, brake pedal do not step on and do not have torque and recovery failure to deposit in case, export and slide energy recovery torque; Deposit in case in torque and recovery failure, export zero torque. Fault, the fault distinguishing of power cell controller transmission that wherein torque failure is sent by accelerator pedal fault, gearshift device fault, drive motor controller obtain; Recovery failure sends fault by device fault of shifting gears, drive motor controller, power cell controller sends fault distinguishing and obtains.
Economics step compares power gear, has bigger Brake energy recovery torque and slides energy recovery torque, and in accelerator pedal is during low aperture, has less driving torque, and these differences are demarcated by MAP.
As shown in Figure 2, the pure electric vehicle power shift control method particular content of the present invention is as follows:
In step 201, according to gearshift device state, entire car controller judges that current shift is as power gear.
In step 202, entire car controller looks into the officer's MAP under power gear according to accelerator pedal aperture and the real-time speed of a motor vehicle, and namely accelerator pedal aperture-speed of a motor vehicle-driving torque relationship figure, obtains target drive torque.
In step 203, the signals such as the fault that entire car controller sends according to accelerator pedal fault, gearshift device fault, the fault of drive motor controller transmission, power cell differentiate whether there is torque failure, if there is no torque failure, perform step 204; If there is torque failure, then proceed to step 213.
In step 204, according to brake pedal status, entire car controller judges whether whole car is braked, if brake pedal is operated, vehicle is in braking mode, performs step 205, otherwise proceeds to step 208.
In step 205, entire car controller searches the Brake energy recovery MAP under power gear according to the real-time speed of a motor vehicle, obtains target braking and reclaims torque.
In step 206, the signals such as the fault that entire car controller sends according to gearshift device fault, the fault of drive motor controller transmission, power cell differentiate whether there is recovery failure, if there is no recovery failure, perform step 207; If there is recovery failure, then proceed to step 213.
In step 207, target Brake energy recovery torque is sent to drive motor controller by CAN by entire car controller, and the torque of drive motor controller control drive-motor exports.
In step 208, entire car controller differentiates according to accelerator pedal aperture, if accelerator pedal aperture is greater than zero, performs step 209; If accelerator pedal is not operated, aperture is zero, then proceed to step 210.
In step 209, the target drive torque obtained in step 202 is sent to drive motor controller by CAN by entire car controller, and the torque of drive motor controller control drive-motor exports.
In step 210, entire car controller is searched according to the real-time speed of a motor vehicle and is slided energy recovery MAP under power gear, obtains target and slides recovery torque.
In step 211, the signals such as the fault that entire car controller sends according to gearshift device fault, the fault of drive motor controller transmission, power cell differentiate whether there is recovery failure, if there is no recovery failure, perform step 212; If there is recovery failure, then proceed to step 213.
In step 212, target is slided recovery torque and is sent to drive motor controller by CAN by entire car controller, and the torque of drive motor controller control drive-motor exports.
In step 213, zero torque instruction is sent to drive motor controller by entire car controller so that drive-motor is outputting power not.
Similar with Fig. 2 workflow and control method particular content, if Fig. 3 is the pure electric automobile economy shift control method of the present invention, particular content is as follows:
In step 301, according to gearshift device state, entire car controller judges that current shift is as economics step.
In step 302, entire car controller looks into the officer's MAP under economics step according to accelerator pedal aperture and the real-time speed of a motor vehicle, and namely accelerator pedal aperture-speed of a motor vehicle-driving torque relationship figure, obtains target drive torque.
In step 303, the signals such as the fault that entire car controller sends according to accelerator pedal fault, gearshift device fault, the fault of drive motor controller transmission, power cell differentiate whether there is torque failure, if there is no torque failure, perform step 304; If there is torque failure, then proceed to step 313.
In step 304, according to brake pedal status, entire car controller judges whether whole car is braked, if brake pedal is operated, vehicle is in braking mode, performs step 305, otherwise proceeds to step 308.
In step 305, entire car controller searches the Brake energy recovery MAP under economics step according to the real-time speed of a motor vehicle, obtains target braking and reclaims torque.
In step 306, the signals such as the fault that entire car controller sends according to gearshift device fault, the fault of drive motor controller transmission, power cell differentiate whether there is recovery failure, if there is no recovery failure, perform step 307; If there is recovery failure, then proceed to step 313.
In step 307, target Brake energy recovery torque is sent to drive motor controller by CAN by entire car controller, and the torque of drive motor controller control drive-motor exports.
In step 308, entire car controller differentiates according to accelerator pedal aperture, if accelerator pedal aperture is greater than zero, performs step 309; If accelerator pedal is not operated, aperture is zero, then proceed to step 310.
In step 309, the target drive torque obtained in step 302 is sent to drive motor controller by CAN by entire car controller, and the torque of drive motor controller control drive-motor exports.
In step 310, entire car controller is searched according to the real-time speed of a motor vehicle and is slided energy recovery MAP under economics step, obtains target and slides recovery torque.
In step 311, the signals such as the fault that entire car controller sends according to gearshift device fault, the fault of drive motor controller transmission, power cell differentiate whether there is recovery failure, if there is no recovery failure, perform step 312; If there is recovery failure, then proceed to step 313.
In step 312, target is slided recovery torque and is sent to drive motor controller by CAN by entire car controller, and the torque of drive motor controller control drive-motor exports.
In step 313, zero torque instruction is sent to drive motor controller by entire car controller so that drive-motor is outputting power not.
Claims (1)
1. a dynamic property economy shift control method for pure electric automobile, comprises step:
Step 1: set up economics step on pure electric automobile shifts gears device, entire car controller (1), according to the shifting state of gearshift device (2), judges that current shift is power gear or economics step;
Step 2: entire car controller (1) searches officer's MAP according to current gear, accelerator pedal (4) aperture and the real-time speed of a motor vehicle, namely accelerator pedal aperture-speed of a motor vehicle-driving torque relationship figure, obtains target drive torque; Wherein power gear correspondence searches dynamic property officer's MAP, and economics step correspondence searches economy officer's MAP, and dynamic property officer's MAP compares economy officer's MAP, in accelerator pedal (4) is during low aperture, has bigger torque and exports;
It is characterized in that, also comprise the following steps:
Step 3: according to brake pedal (3) state, entire car controller (1) judges whether whole car is braked, if the braking mode of being in, search Brake energy recovery MAP, the i.e. speed of a motor vehicle-braking electric braking torque relationship figure, obtain target braking and reclaim torque, and be sent to drive motor controller (5) by CAN; Wherein Brake energy recovery MAP is determined according to gear, the corresponding dynamic property Brake energy recovery MAP of power gear, the corresponding economy Brake energy recovery MAP of economics step, economy Brake energy recovery MAP compares dynamic property Brake energy recovery MAP, has bigger braking electricity torque and exports;
Step 4: in step 3, if brake pedal (3) is in non-brake state, and entire car controller (1) detects that accelerator pedal (4) aperture is zero simultaneously, search and slide energy recovery MAP, the i.e. speed of a motor vehicle-slide electric braking torque relationship figure, obtain target and slide recovery torque, and be sent to drive motor controller (5) by CAN; Wherein slide energy recovery MAP to determine according to gear; the corresponding dynamic property of power gear slides energy recovery MAP; the corresponding economy of economics step slides energy recovery MAP; economy slides energy recovery and compares dynamic property and slide energy recovery MAP, has bigger sliding brake function electricity torque and exports;
Step 5: in step 3, if brake pedal (3) is in non-brake state, and entire car controller (1) detects that accelerator pedal (4) aperture is greater than zero, then the target drive torque obtained according to step 2 simultaneously, it is sent to drive motor controller (5) by CAN;
Step 6: in step 3-5, during the fault driven when there is impact or brake, the fault that the fault that sends such as accelerator pedal fault, gearshift device fault, drive motor controller (5), power cell controller (6) send, differentiate by entire car controller (1), target drive torque is set to zero, is sent to drive motor controller (5) by CAN.
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