CN102343824A - Regenerative braking control method of electric car and device thereof - Google Patents
Regenerative braking control method of electric car and device thereof Download PDFInfo
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Abstract
The invention relates to a regenerative braking control method of an electric car and a device thereof, which are characterized in that a throttle signal, a braking signal, the current speed of the car and the SOC (state of charge) value of a battery are acquired during the running process of the car, when the current speed of the car is larger than the preset minimum feedback speed of the car, and the throttle opening is smaller than the preset feedback threshold value or the braking signal, the feedback moment is calculated according to the current speed and the braking depth; when the SOC value of the battery is smaller than the preset upper limit, the feedback moment is output to charge the battery pack; and when the SOC value of the battery reaches the preset upper limit, an electric machine controller controls an electric machine not to generate braking feedback charge current, and braking is carried out according to the traditional braking method. The method and the device can increase the utilization rate of battery energy, the car can be kept smooth during the travelling, the regenerative braking can be also realized, and in addition, the SOC value of the battery can be real-timely monitored, too, so the battery is prevented from being damaged when the battery is over charged downhill.
Description
Technical field
The present invention relates to a kind of energy reclaiming method of electrical motor, particularly a kind of electric vehicle brake power recycling and control method and device thereof.
Background technology
The critical component of battery-driven car is a battery, the electrokinetic cell stored energy how much be the key factor of decision running distance of eletric vehicles.But the current battery technology remains the bottleneck of development battery-driven car, fails to make a breakthrough, and the continual mileage of battery-driven car can't satisfy user's demand.If the kinetic energy during with car retardation is converted into electric energy, be recovered into battery, rather than the friction slattern, this is equivalent to increase the capacity of battery undoubtedly.Under existing technical conditions, do like this, have great importance for the continual mileage aspect of performance that improves battery-driven car.In general; In battery charge efficient is 100%; Electrical efficiency, feedback braking efficient are 50%; Gross vehicle catabiotic 50% is used to obtain under the imposing a condition of vehicle energy; Based on conservation energy and analytical Calculation obtains: adopt the regenerative brake feedback energy, can improve vehicle continual mileage 33%.
In the former patent; Also have and relate to the braking scheme that electric vehicle brake power is recycled; For example Chinese patent ZL200410070893.3 discloses the control method that a kind of control has the battery-driven car regenerative brake of motor, and this method comprises: detect brake pedal; Operational computations according to brake pedal goes out added non-driving wheel braking force on the battery-driven car non-driving wheel; Calculate target braking force with the corresponding drive wheel of non-driving wheel braking force; Calculate the obtainable regenerative brake power of drive wheel; The target braking force and the obtainable regenerative brake power of drive wheel are compared; And according to the regenerative brake and the hydraulic braking of the comparative result controlling and driving wheel of the target braking force of drive wheel and obtainable regenerative brake power.This method makes at the required braking force of drive wheel during less than obtainable regenerative brake power, just only comes the controlling and driving wheel with the braking force of regeneration, therefore, the effect of regenerative brake, promptly the efficient that reclaims of energy is maximum.When the required braking force of drive wheel during greater than obtainable regenerative brake power, the efficient that battery-driven car can consume is maximum, because this moment, obtainable regenerative brake power was utilized fully, hydraulic braking only is used for the hydraulic braking force of undercompensation.
In Chinese patent ZL03108022.7, disclose a kind of auxiliary power system of electric automobile energy regeneration, this system increases an accessory feed on the main power source basis of electronlmobil, and promptly main battery provides the motor operation the required energy; Accessory feed provides accessory equipment the required energy; Its voltage is chosen by the accessory equipment operating voltage; Main power source is being carried out on the circuit base of feedback, increasing by one road control signal and control accessory feed, making microprocessor can control the feedback electric current of main power source and accessory feed simultaneously; Therefore need not pass through the DC/DC step-down, directly supply power to accessory equipment.Because the accessory equipment power consumption is less, therefore utilize the regenerative brake of motor can satisfy the charging of boosting battery basically.
Though above-mentioned prior art also is the recovery of going Considering Energy from the angle of the braking energy that reclaims battery-driven car; And the energy consumption of reduction battery-driven car; Improve the flying power of battery-driven car; But the recovery method of the regenerative brake of prior art might influence the vehicle braked effect simultaneously, also might be to over-charging of battery.
Summary of the invention
The objective of the invention is to overcome existing defective; And a kind of electric vehicle brake power recycling and control method and device thereof are provided; This method and apparatus can increase the degree of utilization of the energy content of battery; Can guarantee the ride comfort of vehicle in braking procedure; Can realize that again braking energy reclaims; Monitor state-of-charge SOC (the State of Charge) value of battery in addition in real time, avoid in lower long slope, damaging battery to over-charging of battery.
For realizing above-mentioned purpose; A scheme of the present invention is to provide a kind of electric vehicle brake power recycling and control method; This method comprises: step S1, monitor and gather brake pedal depth location signal, accelerator open degree signal, current vehicle speed V and the battery charge state signal SOC of battery-driven car in real time; Step S2 judges that whether current vehicle speed V is greater than preset minimum feedback speed V 0; If then change step S3 over to; Step S3 judges that accelerator open degree is whether less than preset accelerator open degree feedback threshold Acc or do not have brake pedal depth location signal; If then change step S4 over to; Step S4 is according to the current vehicle speed of being gathered, brake pedal depth calculation feedback moment; Step S5 judges that whether the battery charge state value SOC that detects is less than preset battery charge state upper limit threshold SOCmax; If then change step S6 over to; Step S6 is applied to electrical motor with the feedback moment that calculates among the step S4, is battery charge with the reverse pulling motor.
According to above-mentioned conception, the calculating of the feedback moment among the said step S4 is to calculate through following formula: T=K1V+K2Hb; Wherein, T is a feedback moment; V is a current vehicle speed; Hb is the brake pedal degree of depth, and when not having brake signal, then Hb is zero; K1, K2 be respectively preset feedback moment and current vehicle speed and with the proportionality coefficient of the brake pedal degree of depth.
According to above-mentioned conception, if current vehicle speed V is during greater than preset maximum ratio feedback speed V 1, wherein current vehicle speed V calculates according to preset maximum ratio feedback speed V 1 when then calculating feedback moment, i.e. V=V1.
According to above-mentioned conception; COEFFICIENT K 1, K2 are according to the maximum feedback moment Tmax of the definite battery charge of experiment and utilize the computing formula of feedback moment to confirm; Tmax=K1V+K2Hb wherein; When if current vehicle speed V is known preset maximum ratio feedback speed V 1; Then brake pedal depth H b is zero; Tmax=K1V1, then K1=Tmax/V1 so; If current vehicle speed V is 0, then brake pedal depth H b is maxim 100%, Tmax=K2 so; Obtain K1, K2 value through said method, and with it as preset value.
According to above-mentioned conception, among the step S2, if current vehicle speed V is during less than preset minimum feedback speed V o, then said feedback moment T is 0.
According to above-mentioned conception, among the step S3, if accelerator open degree is during greater than preset accelerator open degree feedback threshold Acc, then said feedback moment T is 0.
According to above-mentioned conception, the preset value of described minimum feedback speed V o is 3～6km/h.
According to above-mentioned conception, the preset value of described accelerator open degree feedback threshold Acc is 4-5%.
According to above-mentioned conception, the preset value of described battery charge state upper limit threshold SOCmax is 90-95% for pure electric vehicle, is 70-75% for hybrid vehicle.
According to above-mentioned conception, the preset value of described maximum ratio feedback speed V 1 is 30～40km/h.
The object of the invention also can be implemented through following mode:
A kind of electric vehicle brake power recovery control device comprises: battery pack, and it is used for stored energy to supply power to battery-driven car; Signal gathering unit, it is used to monitor and gather the state-of-charge SOC signal of depth location signal, current vehicle speed, accelerator open degree signal and the battery of brake; Control unit, it comprises: signal receiving unit is used to receive all signals that said signal gathering unit transmits; Preset unit is used for preset minimum feedback speed V 0, maximum ratio feedback speed V 1, battery charge state upper limit threshold SOCmax and accelerator open degree feedback threshold Acc; Comparing unit, the signal that it is used for said signal receiving unit is received and the preset value of preset unit compare; Calculating unit; When it has brake pedal depth location signal greater than preset minimum feedback speed V 0 and accelerator open degree less than preset accelerator open degree feedback threshold Acc or detection at the current vehicle speed V of comparing unit comparison, then according to the current vehicle speed that is received, brake pedal depth calculation feedback moment; Output unit, it is at comparing unit battery charge state value SOC relatively during less than preset battery charge state upper limit threshold SOCmax, with the calculated feedback moment output of calculating unit institute; And electrical motor, it is used to drive battery-driven car and when control unit output feedback moment, receives this feedback moment and give this batteries charging to produce electric energy.
According to above-mentioned conception, said signal gathering unit comprises: accelerator pedal sensor is used to detect the accelerator open degree signal; Brake pedal sensor is used for brake pedal depth location signal; Magslip, it links to each other with the rotor of electrical motor, rotor-position converted to through the electric signal of representing current vehicle speed and to pass to control unit; The SOC signal picker is used to gather the monomer voltage of battery pack, calculates the state-of-charge SOC value of battery pack according to said monomer voltage, and generates state-of-charge SOC signal.
According to above-mentioned conception, also comprise: the parallel capacitance group, it is parallelly connected with said battery pack, is used for the absorbing high-frequency surge voltage; Inverter, it is parallelly connected with said parallel capacitance group, and realizes current transformation, and its output links to each other with electrical motor; The light-coupled isolation unit, it connects inverter and control unit respectively, with to realizing between the input of control unit and inverter, the output signal that photoelectricity isolates.
According to above-mentioned conception, the calculating of the feedback moment in the said calculating unit is to calculate through following formula: T=K1V+K2Hb; Wherein, T is a feedback moment; V is a current vehicle speed; Hb is the brake pedal depth data, and when not having brake signal, then Hb is zero; K1, K2 be respectively preset feedback moment and current vehicle speed and with the proportionality coefficient of the brake pedal degree of depth.
According to above-mentioned conception, if current vehicle speed V is during greater than preset maximum ratio feedback speed V 1, wherein current vehicle speed V calculates according to preset maximum ratio feedback speed V 1 when then calculating feedback moment, i.e. V=V1.
According to above-mentioned conception; COEFFICIENT K 1, K2 are according to the maximum feedback moment Tmax of the definite battery charge of experiment and utilize the computing formula of feedback moment to confirm; Tmax=K1V+K2Hb wherein; When if current vehicle speed V is known preset maximum ratio feedback speed V 1; Then brake pedal depth data Hb is zero; Tmax=K1V1, then K1=Tmax/V1 so; If current vehicle speed V is 0, then brake pedal depth data Hb is maxim 100%, Tmax=K2 so; Obtain K1, K2 value through said method, and with it as preset value.
The present invention compares prior art and has following advantage:
1, the present invention compares with preset value through gathering brake pedal depth location signal, accelerator open degree signal, current vehicle speed V and battery charge state signal SOC; Carry out the feedback moment of battery-driven car then according to result relatively, the state-of-charge value according to battery determines that whether feedback moment being imposed on battery-driven car is battery charge with the reverse pulling motor then; Therefore; Braking recycling and control method of the present invention and device can increase the degree of utilization of the energy content of battery; Can guarantee the ride comfort of vehicle in braking procedure; Can realize that again braking energy reclaims; Monitor the state-of-charge value SOC of battery in addition in real time, avoid in lower long slope, damaging battery to over-charging of battery.
2, it is lower to the invention solves in the prior art battery specific energy, and the short problem of battery-driven car continuation of the journey mileage realizes the high efficiency utilization of the energy, embodies the preceence of new-energy automobile.
3, braking energy of the present invention reclaims and can effectively avoid the glancing impact drg to produce a large amount of frictional heat, makes brake equipment the heat fade phenomenon occur, influences braking effect.Can prolong the service life of drg effectively.
Description of drawings
Fig. 1 is an electric vehicle brake power recycling and control method diagram of circuit of the present invention
Fig. 2 is the theory relation coordinate diagram between feedback moment and the current vehicle speed
Fig. 3 is the actual experiment coordinate diagram between feedback moment and the current vehicle speed
Fig. 4 is an electric vehicle brake power recovery control device structural representation
Fig. 5 is the control unit block diagram of electric vehicle brake power recovery control device
Concern scheme drawing between air-gap rotating magnetic field when Fig. 6 is motor-driven and the rotor field
Fig. 7 is that motor concerns scheme drawing between air-gap rotating magnetic field and the rotor field under the energy regenerating condition when glancing impact is as electrical generator
Label declaration among the figure:
1 battery, 7 inverters
2 Das Gaspedals, 8 light-coupled isolation unit
3 brake pedals, 9 electrical generators
4 signal gathering unit, 10 magslips
5 parallel capacitance group 11SOC signal pickers.
6 control units
61 signal receiving units
62 preset unit
63 comparing units
64 calculating units
65 output units
The specific embodiment
Be described further below in conjunction with the accompanying drawing specific embodiments of the invention.
Electric vehicle brake power of the present invention reclaims controlling schemes, and the SOC value that jams on the degree of depth and electrokinetic cell that is based on Das Gaspedal and brake pedal is come Comprehensive Control.The digital signal that electric machine controller transmits according to throttle, brake and SOC signal picker, the intention of judgement chaufeur is carried out braking energy and is reclaimed.This method and apparatus is not only applicable to pure electric automobile, is applicable to hybrid-electric car yet.
With reference to Fig. 1; Be a kind of electric vehicle brake power recycling and control method diagram of circuit of the present invention; This method comprises the steps: step S1, monitors and gather brake pedal depth location signal, accelerator open degree signal, current vehicle speed V and the battery charge state signal SOC of battery-driven car in real time; Be linear relationship between brake pedal depth location and its brake degree of depth wherein, that is to say that when not touching on the brake, its brake degree of depth is 0; After all stepping down, its brake degree of depth is 100%; Step S2 judges that whether current vehicle speed is less than preset minimum feedback speed V 0, if then do not have feedback moment, i.e. feedback moment T=0; If current vehicle speed V is greater than preset minimum feedback speed V 0; Then change step S3 over to, judge that accelerator open degree is whether greater than preset accelerator open degree feedback threshold Acc or there is not brake signal, if then also do not have feedback moment, i.e. feedback moment T=0; If accelerator open degree is less than preset accelerator open degree feedback threshold Acc or have brake pedal depth location signal; Then change step S4 over to, according to the current vehicle speed of being gathered, brake pedal depth calculation feedback moment; The calculating of feedback moment is to calculate through following formula: T=K1V+K2Hb; Wherein, T is a feedback moment; V is a current vehicle speed; Hb is the brake pedal degree of depth, and when not having brake signal, then Hb is zero; K1, K2 be respectively preset feedback moment and current vehicle speed and with the proportionality coefficient of the brake pedal degree of depth; COEFFICIENT K 1, K2 are according to the maximum feedback moment Tmax of the definite battery charge of experiment and utilize the computing formula of feedback moment to confirm; Tmax=K1V+K2Hb wherein; When if current vehicle speed V is known preset maximum ratio feedback speed V 1; Then brake pedal depth H b is zero; Tmax=K1V1, then K1=Tmax/V1 so; If current vehicle speed V is 0, then brake pedal depth H b is maxim 100%, Tmax=K2 so; Obtain K1, K2 value through said method, and with it as preset value.
In addition, prevent large current charge and just must come controlled feedback moment, that is to say through the controlled feedback speed of a motor vehicle; When current vehicle speed surpasses the higher limit of preset maximum ratio feedback speed V 1; Feedback moment removes speed V=V1, reaches maximum safety feedback moment, as shown in Figure 3.In order to prevent that large current charge from causing damage to battery, in the time of V＞V1, the relation between its three is: T=K
1V
1+ K
2Hb
After calculating feedback moment, get into step S5, judge that whether the battery charge state value SOC that detects is less than preset battery charge state upper limit threshold SOC
MaxIf not, after motor control unit received this signal, the motor control unit control motor did not produce the feedback braking charging current, pressed the braking of traditional braking method; Especially in the vehicle traveling process, particularly condition of road surface is continuous descending, and when vehicle was often braked, the electric weight of battery can be full of because of feedback braking; If, then change step S6 over to, the feedback moment that calculates among the step S4 is applied to electrical motor, with the reverse pulling motor battery charge.
In above-mentioned braking method, relate to the setting of following parameter bound value: state-of-charge upper limit threshold SOC
Max, minimum feedback speed V o, maximum ratio feedback speed V 1 and accelerator open degree feedback threshold Acc.The setting of above Several Parameters has direct influence to the feedback braking effect of battery-driven car.The too little feedback braking that may cause is too frequent, causes motor speed unstable, influences driver comfort; Parameter was provided with the finite energy that conference causes feedback braking, and energy utilization efficiency is lower.Rule of thumb, set the SOC of pure electric vehicle with the result who tests
MaxValue is 95%, the SOC of hybrid vehicle
MaxValue is 70%, and the preferable range of minimum feedback speed V o is between 3～6km/h, and the preferable range of maximum ratio feedback speed V 1 is between 30～40km/h, and the preferable range of the feedback threshold Acc of accelerator open degree is between 4%～5%.
With reference to Fig. 4, be electric vehicle brake power recovery control device structural representation of the present invention; This device comprises: battery pack 1, and it is used for stored energy to supply power to battery-driven car, and voltage is 250V～380V; Signal gathering unit 4, it comprises: accelerator pedal sensor, it is located at and is used to detect the accelerator open degree signal on the Das Gaspedal 2; Brake pedal sensor; It is located at and is used to detect brake pedal depth location signal on the brake pedal 3; Be about to be divided into some five equilibriums with the position of brake pedal bonded assembly brake lever; Utilize brake pedal sensor to gather the signal of the position of these some five equilibriums; Signal with sensor acquisition converts electric signal into again, the then corresponding corresponding brake depth H b in the position of these some five equilibriums; Magslip 10, its rotor with electrical motor 9 links to each other, rotor-position is converted to through representing the electric signal of current vehicle speed; And SOC signal picker 11, be used to gather the monomer voltage of battery pack, calculate the state-of-charge SOC value of battery pack according to said monomer voltage, and generate state-of-charge SOC signal; Control unit 6; The signal that it is transmitted according to received signal gathering unit 4; Itself and preset value are compared; Calculate feedback moment according to result relatively, and determine that according to the state-of-charge RST of battery whether feedback moment being imposed on electrical motor charges the battery with reverse pulling motor; Light-coupled isolation unit 8, its incoming signal, output electric signal have the good isolation effect, realize the complete electrical isolation of signal, and it is connected between control unit 6 and the inverter 7; Inverter 7, it is used for alternating current and straight-though inversion; Parallel capacitance group 5, it is parallelly connected with inverter 7 with said battery pack 1 respectively, is used for the absorbing high-frequency surge voltage, plays the effect of smooth dc voltage waveform; Electrical motor, it is used to drive battery-driven car and when control unit output feedback moment, gives this batteries charging as electrical generator to produce electric energy with receiving this feedback moment.
With reference to Fig. 5, be the control unit block diagram of electric vehicle brake power recovery control device, this control unit 6 comprises: signal receiving unit 61 is used to receive all signals that said signal gathering unit transmits; Preset unit 62 is used for preset minimum feedback speed V 0, maximum ratio feedback speed V 1, battery charge state upper limit threshold SOC
MaxAnd accelerator open degree feedback threshold Acc; Comparing unit 63, the signal that it is used for said signal receiving unit is received and the preset value of preset unit compare; Calculating unit 64; When it has brake pedal depth location signal greater than preset minimum feedback speed V 0 and accelerator open degree less than preset accelerator open degree feedback threshold Acc or detection at the current vehicle speed V of comparing unit comparison, then according to the current vehicle speed that is received, brake pedal depth calculation feedback moment; Output unit 65, its at comparing unit battery charge state value SOC relatively less than preset battery charge state upper limit threshold SOC
MaxThe time, with the calculated feedback moment output of calculating unit institute.
Following principle of work with reference to Fig. 4-7 explanation method and apparatus of the present invention:
When normal vehicle operation; Motor 9 is that forward is electronic; The rotor of this moment is rotation counterclockwise; Can find out by Fig. 4; Through inverter 7 three phase windings that cell voltage is added to motor 9 are produced a rotating excitation field from battery pack 1; The air-gap rotating magnetic field B of the synthetic motor of the permanent magnetic field of this magnetic field and rotor; The relation of the direction of Fig. 6 describes when being motoring condition air-gap rotating magnetic field B and rotating excitation field F; The direction of rotating excitation field B was the direction that is ahead of rotor field F when obviously motor was in motoring condition; This rotating excitation field B drags rotor field F and rotates synchronously; Promptly drive rotor and rotate synchronously, therefore the electric energy with input is converted into mechanical energy.When the brake or the signal of pine tar door; Motor control unit 6 control motor feedback energies; Operation logic according to electrical motor; Change the direction relations between these two magnetic fields; Fig. 7 describes when being the energy feedback; Electrical motor operates in generating state; The direction of rotating field B lags behind the direction of rotor field F; Rotor field F drives this rotating field B and rotates synchronously, transmits certain electromagnetic power, and this moment, the mechanical energy with rotor was converted into electric energy; Give battery 1 charging from stator winding output electric energy; In the output electric energy, rotor speed is descended, reached the effect of braking.
The feedback moment that feedback produced of braking energy is relevant with current vehicle speed, and current vehicle speed is passed through the position that the magslip 10 among Fig. 4 is gathered rotors, and calculates the moving velocity of vehicle.
The energy back-feed control method of the battery-driven car in the above embodiment is when in the process of carrying out, system acquisition throttle signal, brake signal; If brake signal is arranged; Then, provide feedback moment, battery pack is charged according to current vehicle speed, brake depth calculation moment; When chaufeur pine tar door reached certain value, electric machine controller was judged the intention of chaufeur according to the signal of being gathered at this moment, and judges the speed of a motor vehicle, and factored moment provides feedback moment, and battery pack is charged; When the SOC of battery value had reached the boundary value that sets, the motor controller controls motor did not produce the feedback braking charging current, braked by traditional brake modes.
More than disclosed, only for preferred embodiment of the present invention, can not limit protection scope of the present invention with this, therefore change or modify, the scope that still belongs to claim of the present invention and contained according to the equalization that the present invention did.
Claims (10)
1. an electric vehicle brake power recycling and control method is characterized in that, comprising:
Step S1 monitors and gathers brake pedal depth location signal, accelerator open degree signal, current vehicle speed V and the battery charge state signal SOC of battery-driven car in real time;
Step S2 judges that whether current vehicle speed V is greater than preset minimum feedback speed V
0If then change step S3 over to;
Step S3 judges that accelerator open degree is whether less than preset accelerator open degree feedback threshold Acc or do not have brake pedal depth location signal; If then change step S4 over to;
Step S4 is according to the current vehicle speed of being gathered, brake pedal depth calculation feedback moment;
Step S5 judges that whether the battery charge state value SOC that detects is less than preset battery charge state upper limit threshold SOC
MaxIf then change step S6 over to;
Step S6 is applied to electrical motor with the feedback moment that calculates among the step S4, is battery charge with the reverse pulling motor.
2. electric vehicle brake power recycling and control method according to claim 1 is characterized in that, the calculating of the feedback moment among the said step S4 is to calculate through following formula:
T＝K
1V+K
2Hb；
Wherein, T is a feedback moment; V is a current vehicle speed; Hb is the brake pedal degree of depth, and when not having brake signal, then Hb is zero; K
1, K
2Be respectively preset feedback moment and current vehicle speed and with the proportionality coefficient of the brake pedal degree of depth.
3. electric vehicle brake power recycling and control method according to claim 1 and 2 is characterized in that if current vehicle speed V feeds back speed V greater than preset maximum ratio
1The time, wherein current vehicle speed V is according to preset maximum ratio feedback speed V when then calculating feedback moment
1Calculate, i.e. V=V
1
4. electric vehicle brake power recycling and control method according to claim 3 is characterized in that, COEFFICIENT K 1, K2 are the maximum feedback moment T according to the definite battery charge of experiment
MaxAnd utilize the computing formula of feedback moment to confirm, T wherein
Max=K
1V+K
2Hb is if current vehicle speed V is known preset maximum ratio feedback speed V
1The time, then brake pedal depth H b is zero, so T
Max=K
1V
1, K then
1=T
Max/ V
1If current vehicle speed V is 0, then brake pedal depth H b is maxim 100%, T so
Max=K
2Obtain K through said method
1, K
2The value, and with it as preset value.
5. electric vehicle brake power recycling and control method according to claim 1 is characterized in that, among the step S2, if current vehicle speed V is during less than preset minimum feedback speed V o, then said feedback moment T is 0.
6. electric vehicle brake power recycling and control method according to claim 1 is characterized in that, among the step S3, if accelerator open degree is during greater than preset accelerator open degree feedback threshold Acc, then said feedback moment T is 0.
7. an electric vehicle brake power recovery control device is characterized in that, comprising:
Battery pack, it is used for stored energy to supply power to battery-driven car;
Signal gathering unit, it is used to monitor and gather the state-of-charge SOC signal of depth location signal, current vehicle speed, accelerator open degree signal and the battery of brake;
Control unit, it comprises:
Signal receiving unit is used to receive all signals that said signal gathering unit transmits;
Preset unit is used for preset minimum feedback speed V 0, maximum ratio feedback speed V 1, battery charge state upper limit threshold SOC
MaxAnd accelerator open degree feedback threshold Acc;
Comparing unit, the signal that it is used for said signal receiving unit is received and the preset value of preset unit compare;
Calculating unit; When it has brake pedal depth location signal greater than preset minimum feedback speed V 0 and accelerator open degree less than preset accelerator open degree feedback threshold Acc or detection at the current vehicle speed V of comparing unit comparison, then according to the current vehicle speed that is received, brake pedal depth calculation feedback moment;
Output unit, its at comparing unit battery charge state value SOC relatively less than preset battery charge state upper limit threshold SOC
MaxThe time, with the calculated feedback moment output of calculating unit institute;
Electrical motor, it is used to drive battery-driven car and when control unit output feedback moment, receives this feedback moment and give this batteries charging to produce electric energy.
8. electric vehicle brake power recovery control device according to claim 7 is characterized in that, said signal gathering unit comprises:
Accelerator pedal sensor is used to detect the accelerator open degree signal;
Brake pedal sensor is used for brake pedal depth location signal;
Magslip, it links to each other with the rotor of electrical motor, rotor-position converted to through the electric signal of representing current vehicle speed and to pass to control unit;
The SOC signal picker is used to gather the monomer voltage of battery pack, calculates the state-of-charge SOC value of battery pack according to said monomer voltage, and generates state-of-charge SOC signal.
9. electric vehicle brake power recovery control device according to claim 7 is characterized in that, also comprises:
The parallel capacitance group, it is parallelly connected with said battery pack, is used for the absorbing high-frequency surge voltage;
Inverter, it is parallelly connected with said parallel capacitance group, and realizes current transformation, and its output links to each other with electrical motor;
The light-coupled isolation unit, it connects inverter and control unit respectively, with to realizing between the input of control unit and inverter, the output signal that photoelectricity isolates.
10. electric vehicle brake power recovery control device according to claim 7; It is characterized in that; If current vehicle speed V is during greater than preset maximum ratio feedback speed V 1, wherein current vehicle speed V calculates according to preset maximum ratio feedback speed V 1 when then calculating feedback moment, i.e. V=V1.
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| CN104015625A (en) * | 2014-06-13 | 2014-09-03 | 广东亿纬赛恩斯新能源***有限公司 | Electric vehicle energy recovery method and device |
| CN104108316A (en) * | 2014-04-12 | 2014-10-22 | 北京工业大学 | Electrohydraulic-combined brake control method of battery electric vehicle |
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