CN102717714A - Pure electric vehicle braking energy recovery control system and method based on DCT (Data Communication Terminal) - Google Patents
Pure electric vehicle braking energy recovery control system and method based on DCT (Data Communication Terminal) Download PDFInfo
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Abstract
The invention discloses a pure electric vehicle braking energy recovery control system and method based on a DCT (Data Communication Terminal), relating to the technical field of electric vehicles. The control system comprises a vehicle-mounted storage battery, a motor, a two-gear DCT automatic gearbox, a vehicle speed sensor, a master cylinder pressure sensor, a vehicle control unit, a battery management system, a motor controller, a gearbox controller and a feedback type brake anti-lock system, wherein the vehicle-mounted storage battery supplies power for the motor, and the motor is mechanically connected with the DCT automatic gearbox; and the vehicle control unit, the battery management system, the motor controller, the gearbox controller, the feedback type brake anti-lock system, the vehicle speed sensor and the master cylinder pressure sensor carry out information communication and instruction issue through a network and hard wires. The invention also discloses the pure electric vehicle braking energy recovery control method based on the DCT. The energy utilization and the driving mileage of the vehicles are increased.
Description
Technical field
The present invention relates to the electric vehicle engineering field, relate in particular to a kind of pure electric automobile braking energy recovery control system and method based on DCT.
Background technology
External pure electric automobile scheme is many to be main with the single-stage deceleration, realizes the speed-regulating function demand through motor fully, covers the power demand of the full operating mode of car load through permanent torque of motor low speed and high speed constant output characteristic.Yet there is gap in domestic electric machine because manufacturing technology etc.; Maximum speed of revolution is difficult to reach more than 10,000 commentaries on classics; The dynamic property level that has limited pure electric automobile promotes; And the high efficiency region scope to motor is had higher requirement, and therefore adopts the single-stage reduction ratio to be difficult to obtain good dynamic property and economy.
Rare power drive system exploitation in the pure electric automobile exploitation based on DCT (Dual Clutch Transmission is meant the double-clutch automatic speed-change device).Traditional DCT change speed gear box is because the design of many gears, and do not have the turbine transformer of AT Automatic Transmission, and driving efficiency is high, helps the energy consumption of the power system of coupling is optimized design.But structure and the cost of the many retainings of tradition DCT are higher than single reduction gear.Through to carrying out simplified design based on traditional DCT change speed gear box, the rational Match power drive system reduces maximum speed and grade climbing performance to the motor design requirement, and takes into account between the motor high efficient area, can improve the dynamic property and the economy of car load simultaneously.
Be applied to pure electric automobile but mate lift-launch with motor, its applying working condition and gear shift control have certain difference, particularly will rationally utilize regenerated energy to improve the continual mileage of electronlmobil.
Summary of the invention
The objective of the invention is to pure power driven system, carry out braking energy recovery control system and control policy exploitation, improve the energy utilization and the continual mileage of automobile based on DCT based on existing DCT.
In order to reach above purpose; The invention discloses a kind of pure electric automobile braking energy recovery control system based on DCT; Comprise: Vehicular accumulator cell, motor, two retaining DCT Automatic Transmission, car speed sensor, master cylinder pressure sensor, entire car controller, battery management system, electric machine controller, gearbox control, feed-back type anti-blocking brake system; Vehicular accumulator cell is supplied power to motor; Motor and DCT Automatic Transmission are mechanical connections, and entire car controller, battery management system, electric machine controller, gearbox control, feed-back type anti-blocking brake system, car speed sensor, master cylinder pressure sensor carry out information communication and instruction transmission through network and rigid line.
Further, as a kind of preferred, said each network is the CAN bus.
Further, as a kind of preferred, said feed-back type anti-blocking brake system possesses the function of conventional hydraulic brake system; Realize conventional brake and traditional abs braking, in addition, through increasing control cock; Regulate brake-pipe pressure according to instruction, coordinate conventional brake and motor regenerative braking power.
A kind of pure electric automobile braking energy recycling and control method based on DCT comprises the steps:
Step 1: entire car controller receives the speed-slackening signal of brake pedal, ARC Acceleration Signal, master cylinder pressure signal, GES and the anti-blocking brake system status signal of acceleration pedal;
Step 2: entire car controller is resolved driver intention according to brake pedal signal and master cylinder pressure signal, calculates target braking force, makes a strategic decision according to the state and the car load speed of a motor vehicle state of current anti-blocking brake system, whether carries out regenerative brake control; When speed-slackening signal is zero and acceleration pedal signal non-zero, perhaps the anti-blocking brake system state is for starting, and perhaps SOC >=90% does not get into the regenerative brake pattern; When speed-slackening signal is that non-zero or acceleration pedal signal are zero, and battery SOC 90%, if the speed of a motor vehicle greater than 10km/h and less than 100km/h, gets into the regenerative brake pattern; When speed-slackening signal is that non-zero or acceleration pedal signal are zero, and battery SOC 90%, if the speed of a motor vehicle does not get into the regenerative brake pattern less than 10km/h or greater than 100km/h;
Step 3: if get into the regenerative brake pattern, entire car controller and gearbox control communicate, and control shift clutch pressure is constant, keep DCT Automatic Transmission current shift constant, do not carry out self shifter control, guarantee whole process power failure-free; Gearbox control sends the gear information of current DCT Automatic Transmission to entire car controller; Entire car controller calculates the regenerative braking moment that motor can provide according to maximum charging current, battery terminal voltage, motor speed, DCT Automatic Transmission gear that current battery allows; When the end of regenerative brake pattern, gearbox control control change speed gear box gear changes to a retaining;
Step 4: if regenerative braking moment greater than target braking force, then braking force is all provided by motor braking, control motor be in generating state; If regenerative brake power is during less than target braking force, then the regenerative braking moment of motor can not satisfy current demand braking force, and the residue braking requirement sends to by feed-back type anti-blocking brake system valve body regulates line pressure, is provided by the mechanical friction braking force;
Step 5: entire car controller calculates the residue mechanical braking power demand that obtains according to motor braking power and target braking; Residue braking force and trailing wheel can provide braking to compare; According to the front and back wheel braking relations of distribution, calculate the braking force of residue brakig force distribution on trailing wheel;
Step 6: entire car controller carries out braking deceleration and calculates according to the speed of a motor vehicle of gathering, with the target requirement braking-force ratio; If far below the car load braking requirement; Think that motor braking lost efficacy,, all adopt mechanical braking through the control and regulation of feed-back type anti-blocking brake system valve body.
Beneficial effect of the present invention is owing to adopting two grades of DCT Automatic Transmission, communicate through entire car controller and gearbox control; Guarantee the change speed gear box power failure-free; And keep current shifting state constant, do not carry out self shifter control, reclaim and finish back gear return control; Can reach performances such as the good gradual sensation of car load brakig force distribution, brake pedal, the braking energy percent recovery, braking safety, have simple in structure, cost is low, control characteristics such as realization easily.
Description of drawings
When combining accompanying drawing to consider; Through with reference to following detailed, can more completely understand the present invention better and learn wherein many attendant advantages easily, but accompanying drawing described herein is used to provide further understanding of the present invention; Constitute a part of the present invention; Illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute to improper qualification of the present invention, wherein:
Fig. 1 is the pure electric automobile braking energy recovery control system block diagram based on DCT;
Fig. 2 is the pure electric automobile braking energy recycling and control method diagram of circuit based on DCT;
Fig. 3 judges braking energy feedback model process figure for the DCT automatic transmission controller.
The specific embodiment
Referring to figs. 1 through Fig. 3 embodiments of the invention are described.
For make above-mentioned purpose, feature and advantage can be more obviously understandable, below in conjunction with accompanying drawing and the specific embodiment the present invention done further detailed explanation.
As shown in Figure 1; A kind of pure electric automobile braking energy recovery control system based on DCT; Comprise: Vehicular accumulator cell 1, motor 2, two keep off DCT Automatic Transmission 3, car speed sensor 4, master cylinder pressure sensor 5, entire car controller 6, battery management system 7, electric machine controller 8, gearbox control 9, feed-back type anti-blocking brake system 10; Vehicular accumulator cell 1 is to motor 2 power supplies; Motor 2 is mechanical connections with DCT Automatic Transmission 3, and entire car controller 6, battery management system 7, electric machine controller 8, gearbox control 9, feed-back type anti-blocking brake system 10, car speed sensor 4, master cylinder pressure sensor 5 carry out information communication and instruction transmission through network and rigid line.Each network is the CAN bus.The feed-back type anti-blocking brake system possesses the function of conventional hydraulic brake system, realizes conventional brake and traditional abs braking, in addition, through increasing control cock, regulates brake-pipe pressure according to instruction, coordinates conventional brake and motor regenerative braking power.
As shown in Figure 2, a kind of pure electric automobile braking energy recycling and control method based on DCT comprises the steps:
S1, step 1: entire car controller receives the speed-slackening signal of brake pedal, ARC Acceleration Signal, master cylinder pressure signal, GES and the anti-blocking brake system status signal of acceleration pedal;
S2, step 2:S21, entire car controller are resolved driver intention according to brake pedal signal and master cylinder pressure signal; S22, calculating target braking force; S23, make a strategic decision, whether carry out regenerative brake control according to the state and the car load speed of a motor vehicle state of current anti-blocking brake system; When speed-slackening signal is zero and acceleration pedal signal non-zero, perhaps the anti-blocking brake system state is for starting, and perhaps SOC >=90% does not get into the regenerative brake pattern; When speed-slackening signal is that non-zero or acceleration pedal signal are zero, and battery SOC 90%, if the speed of a motor vehicle greater than 10km/h and less than 100km/h, gets into the regenerative brake pattern; When speed-slackening signal is that non-zero or acceleration pedal signal are zero, and battery SOC 90%, if the speed of a motor vehicle does not get into the regenerative brake pattern less than 10km/h or greater than 100km/h;
If S3, step 3:S31 get into the regenerative brake pattern; Entire car controller and gearbox control communicate, and control shift clutch pressure is constant, keep DCT Automatic Transmission current shift constant; Do not carry out self shifter control, guarantee whole process power failure-free; Gearbox control sends the gear information of current DCT Automatic Transmission to entire car controller; Maximum charging current, battery terminal voltage, motor speed, DCT Automatic Transmission gear that entire car controller allows according to current battery, calculate the regenerative braking moment that motor can provide at S32; When the end of regenerative brake pattern, gearbox control control change speed gear box gear changes to a retaining;
S4, step 4:S41, judge regenerative braking moment and target braking force size, if the S42 regenerative braking moment greater than target braking force, then braking force is all provided by motor braking, the control motor is in generating state; If S43 regenerative brake power is during less than target braking force; Then the regenerative braking moment of motor can not satisfy current demand braking force; The residue braking requirement sends to by feed-back type anti-blocking brake system valve body regulates line pressure, is provided by the mechanical friction braking force;
S5, step 5: entire car controller calculates the residue mechanical braking power demand that obtains according to motor braking power and target braking; Residue braking force and trailing wheel can provide braking to compare; According to the front and back wheel braking relations of distribution, calculate the braking force of residue brakig force distribution on trailing wheel;
S6, step 6:S63, entire car controller are according to the speed of a motor vehicle of gathering; Carry out braking deceleration and calculate, with the target requirement braking-force ratio, if far below the car load braking requirement; Think that motor braking lost efficacy; Through feed-back type anti-blocking brake system valve body control and regulation, S61, do not carry out regenerative brake control, S62, all adopt mechanical braking.
The method of calculating of regenerative braking moment is following: if < < 100km/>h, electric braking force then control motor regenerative brake torque T=demand lock torque/current DCT change speed gear box transmitting ratio/base ratio greater than the demand braking force to the speed of a motor vehicle to 10km/h; If < < 100km/>h, electric braking force then control motor regenerative brake torque T=motor maximum braking moment/current DCT change speed gear box transmitting ratio/base ratio less than the demand braking force to the speed of a motor vehicle to 10km/h; Calculate the unmet demand lock torque, judge that according to unmet demand braking force size by front-wheel, trailing wheel or single rear wheel provide, and send to EABS valve body adjusting brake-pipe pressure; If 10km/h the speed of a motor vehicle 100km/h, and acceleration pedal signal and brake pedal signal be zero, detects current battery status; Control motor regenerative brake torque slides control of braking with constant 15Nm; When detect the speed of a motor vehicle 15km/h, the calculated relationship of control motor regenerative brake torque=-3 * speed of a motor vehicle+30 smoothly withdraws from control, as the speed of a motor vehicle most 10km/h that descends; It is 0 that braking energy reclaims controlling torque, all withdraws from.
Said regenerative brake masterpiece is used for front-wheel.
As shown in Figure 3, be the detailed description of step 3.
As stated, embodiments of the invention have been carried out explanation at length, but as long as not breaking away from inventive point of the present invention and effect in fact can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, such variation also all is included within protection scope of the present invention.
Claims (4)
1. pure electric automobile braking energy recovery control system based on DCT; It is characterized in that; Comprise: Vehicular accumulator cell, motor, two retaining DCT Automatic Transmission, car speed sensor, master cylinder pressure sensor, entire car controller, battery management system, electric machine controller, gearbox control, feed-back type anti-blocking brake system; Vehicular accumulator cell is supplied power to motor; Motor and DCT Automatic Transmission are mechanical connections, and entire car controller, battery management system, electric machine controller, gearbox control, feed-back type anti-blocking brake system, car speed sensor, master cylinder pressure sensor carry out information communication and instruction transmission through network and rigid line.
2. a kind of pure electric automobile braking energy recovery control system based on DCT according to claim 1, it is characterized in that: said each network is the CAN bus.
3. a kind of pure electric automobile braking energy recovery control system according to claim 1 and 2 based on DCT; It is characterized in that said feed-back type anti-blocking brake system possesses the function of conventional hydraulic brake system, realize conventional brake and traditional abs braking; In addition; Through increasing control cock, regulate brake-pipe pressure according to instruction, coordinate conventional brake and motor regenerative braking power.
4. the pure electric automobile braking energy recycling and control method based on DCT is characterized in that, comprises the steps:
Step 1: entire car controller receives the speed-slackening signal of brake pedal, ARC Acceleration Signal, master cylinder pressure signal, GES and the anti-blocking brake system status signal of acceleration pedal;
Step 2: entire car controller is resolved driver intention according to brake pedal signal and master cylinder pressure signal, calculates target braking force, makes a strategic decision according to the state and the car load speed of a motor vehicle state of current anti-blocking brake system, whether carries out regenerative brake control; When speed-slackening signal is zero and acceleration pedal signal non-zero, perhaps the anti-blocking brake system state is for starting, and perhaps SOC >=90% does not get into the regenerative brake pattern; When speed-slackening signal is that non-zero or acceleration pedal signal are zero, and battery SOC 90%, if the speed of a motor vehicle greater than 10km/h and less than 100km/h, gets into the regenerative brake pattern; When speed-slackening signal is that non-zero or acceleration pedal signal are zero, and battery SOC 90%, if the speed of a motor vehicle does not get into the regenerative brake pattern less than 10km/h or greater than 100km/h;
Step 3: if get into the regenerative brake pattern, entire car controller and gearbox control communicate, and control shift clutch pressure is constant, keep DCT Automatic Transmission current shift constant, do not carry out self shifter control, guarantee whole process power failure-free; Gearbox control sends the gear information of current DCT Automatic Transmission to entire car controller; Entire car controller calculates the regenerative braking moment that motor can provide according to maximum charging current, battery terminal voltage, motor speed, DCT Automatic Transmission gear that current battery allows; When the end of regenerative brake pattern, gearbox control control change speed gear box gear changes to a retaining;
Step 4: if regenerative braking moment greater than target braking force, then braking force is all provided by motor braking, control motor be in generating state; If regenerative brake power is during less than target braking force, then the regenerative braking moment of motor can not satisfy current demand braking force, and the residue braking requirement sends to by feed-back type anti-blocking brake system valve body regulates line pressure, is provided by the mechanical friction braking force;
Step 5: entire car controller calculates the residue mechanical braking power demand that obtains according to motor braking power and target braking; Residue braking force and trailing wheel can provide braking to compare; According to the front and back wheel braking relations of distribution, calculate the braking force of residue brakig force distribution on trailing wheel;
Step 6: entire car controller carries out braking deceleration and calculates according to the speed of a motor vehicle of gathering, with the target requirement braking-force ratio; If far below the car load braking requirement; Think that motor braking lost efficacy,, all adopt mechanical braking through the control and regulation of feed-back type anti-blocking brake system valve body.
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