CN106183833A - Electric vehicle brake power response rate evaluation method - Google Patents

Electric vehicle brake power response rate evaluation method Download PDF

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Publication number
CN106183833A
CN106183833A CN201610532621.3A CN201610532621A CN106183833A CN 106183833 A CN106183833 A CN 106183833A CN 201610532621 A CN201610532621 A CN 201610532621A CN 106183833 A CN106183833 A CN 106183833A
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China
Prior art keywords
braking energy
conditions
brake pressure
wheel cylinder
under
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CN201610532621.3A
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Chinese (zh)
Inventor
张永生
赵子亮
魏文若
李元
杨兴旺
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FAW Group Corp
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FAW Group Corp
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Priority to CN201610532621.3A priority Critical patent/CN106183833A/en
Publication of CN106183833A publication Critical patent/CN106183833A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L7/00—Electrodynamic brake systems for vehicles in general
    • B60L7/10—Dynamic electric regenerative braking

Abstract

The invention discloses a kind of electric vehicle brake power response rate evaluation method, it comprises the following steps: four wheel cylinder brake pressures according to being gathered under the conditions of closing braking energy recovering function calculate car load frictional damping moment of torsion, and four wheel cylinder brake pressures according to being gathered under the conditions of opening braking energy recovering function calculate car load frictional damping moment of torsion；The braking energy dissipated by brake when utilizing the car load frictional damping moment of torsion estimation brakeless energy regenerating under the conditions of the closedown braking energy recovering function of estimation；The braking energy that the difference estimation motor of the car load frictional damping moment of torsion under the conditions of utilizing the car load frictional damping moment of torsion under the conditions of the cut out braking energy recovering function of estimation and opening braking energy recovering function reclaims；The braking energy utilizing the motor of estimation to reclaim calculates Brake energy recovery rate.The present invention utilizes the braking energy that the estimation of wheel cylinder brake pressure signal is reclaimed, it is to avoid install extra high pressure measuring devices additional, reduces test job mesohigh potential safety hazard.

Description

Electric vehicle brake power response rate evaluation method
Technical field
The invention belongs to technical field of new energy, particularly relate to a kind of electric vehicle brake power response rate estimation side Method.
Background technology
Brake energy recovery is that electric automobile reduces energy consumption, improves one of key technology of car load economy, braking energy The response rate is to evaluate the main method of Brake energy recovery ability, and the most conventional Brake energy recovery rate computational methods are to utilize The electric current of regenerative braking generation and the integration of voltage calculate the braking energy of recovery, utilize the kinetic energy in braking procedure to deduct sky The energy dissipated by brake when the energy of atmidometer and resistance to rolling consumption calculates Brake energy recovery, finally by the two Ratio calculation Brake energy recovery rate, this method needs electric current and voltage parameter when calculating the braking energy reclaimed, if CAN message cannot be obtained resolve, it is necessary on vehicle high-voltage wire harness, install extra high pressure measuring devices additional, there is safety hidden Suffer from, and cost is high, operation complexity；When calculating the energy that brake dissipates, need to obtain the associated resistive ginseng such as windage, rolling resistance Number, and to obtain windage accurately, rolling resistance parameter, especially windage relevant parameter difficulty big, although can use and slide Mode obtains overall resistance of taxing, but is affected bigger by external condition especially wind speed.
It is therefore desirable to find one can either solve above-mentioned technical problem, can relatively accurately calculate braking energy again and return The method of yield.
Summary of the invention
For the problems referred to above, it is an object of the invention to provide a kind of electric vehicle brake power response rate evaluation method, its nothing Electric current when need to brake recovery and voltage signal, it is not necessary to the parameters such as windage and rolling resistance, without obtaining cunning by the way of sliding Row resistance, mainly utilizes wheel cylinder brake pressure to estimate Brake energy recovery rate, it is to avoid to install electric current additional on vehicle high-voltage wire harness And voltage sensor, simple and safe operation, estimation work efficiency is high, not only can be applicable to rotary drum test but also can be applicable in actual road Drive test tries.
The present invention solves technical problem and adopts the following technical scheme that a kind of electric vehicle brake power response rate evaluation method, It comprises the following steps:
S10, calculate car loads and rub according to closing four the wheel cylinder brake pressures gathered under the conditions of braking energy recovering function Wiping braking torque, four wheel cylinder brake pressures according to being gathered under the conditions of opening braking energy recovering function calculate car load friction Braking torque；
S20, utilize that step S10 estimates close car load frictional damping moment of torsion under the conditions of braking energy recovering function and open Open the braking energy that the difference estimation motor of the car load frictional damping moment of torsion under the conditions of braking energy recovering function reclaims；
The braking energy that S30, the motor utilizing step S20 to estimate reclaim calculates Brake energy recovery rate.
Optionally, described four wheel cylinder brake pressures are the near front wheel wheel cylinder brake pressure, off-front wheel wheel cylinder brake pressure, a left side Trailing wheel wheel cylinder brake pressure and off hind wheel wheel cylinder brake pressure.
Optionally, formula is passed through:
Ttotal_W/o=(pfr_W/o+pfl_W/o)×Cpfront+(prr_W/o+prl_W/o)×Cprear；
Calculate car load frictional damping torque T under the conditions of closedown braking energy recovering functiontotal_W/o；
In formula, pfl_W/oFor the near front wheel wheel cylinder brake pressure under the conditions of closedown braking energy recovering function；pfr_W/oFor closing Close the off-front wheel wheel cylinder brake pressure under the conditions of braking energy recovering function；prl_W/oFor closing braking energy recovering function condition Under left rear wheel wheel cylinder brake pressure；prr_W/oFor the off hind wheel wheel cylinder brake pressure under the conditions of closedown braking energy recovering function； CpfrontFor front axle brake pressure and braking torque conversion coefficient, CprearFor rear axle brake pressure and braking torque conversion coefficient.
Optionally, formula is passed through
Ttotal_W=(pfr_W+pfl_W)×Cpfront+(prr_W+prl_W)×Cprear；
Calculate and open car load frictional damping torque T under the conditions of braking energy recovering functiontotal_W；
In formula, pfl_WFor the near front wheel wheel cylinder brake pressure under the conditions of unlatching braking energy recovering function；pfr_WFor the system of opening Energy reclaims the off-front wheel wheel cylinder brake pressure under functional conditions；prl_WFor the left side under the conditions of unlatching braking energy recovering function Trailing wheel wheel cylinder brake pressure；prr_WFor the off hind wheel wheel cylinder brake pressure under the conditions of unlatching braking energy recovering function；CpfrontFor Front axle brake pressure and braking torque conversion coefficient, CprearFor rear axle brake pressure and braking torque conversion coefficient.
Optionally, formula is passed through:
P g e n = n m o t o r × 2 π × ( T t o t a l _ W / o - T t o t a l _ W ) i × η d r i v e r t r a i n × η g e n ;
Calculate the braking energy that motor reclaims；
In formula, PgenThe braking power reclaimed for motor；nmotorFor motor speed, ηgenFor electric power generation efficiency, ηdrivertrainFor drive line efficiency, Ttotal_W/oFor closing car load frictional damping moment of torsion during braking energy recovering function, Ttotal_W For opening car load frictional damping moment of torsion during braking energy recovering function.
Optionally, formula is passed through:
ξ r e g = ΣP g e n × Δ t ΣT t o t a l _ W / o × v x r × Δ t × 100 % ,
Calculate Brake energy recovery rate；
In formula, ξregFor Brake energy recovery rate, vxFor speed, r is radius of wheel, and Δ t is the sampling time.
There is advantages that
1. the present invention mainly utilizes wheel cylinder brake pressure signal to estimate the braking energy of recovery by indirectly mode, it is to avoid Substantial amounts of CAN signal cracks work, reduces workload, it also avoid simultaneously and install extra high pressure on vehicle high-voltage wire harness additional Measurement equipment, significantly reduces test job mesohigh potential safety hazard, reduces and measures cost.
2. the present invention mainly utilizes wheel cylinder brake pressure signal and GES to calculate the energy that brake dissipates, it is not necessary to wind The parameters such as resistance and rolling resistance, without obtaining resistance of taxing by the way of sliding so that brake dissipation energy calculates process more Add simplicity.
Accompanying drawing explanation
Fig. 1 is that the electric vehicle brake power response rate of the present invention estimates schematic flow sheet.
In figure, labelling is illustrated as: 201-braking torque computing module；202-braking energy estimation block；203-braking energy Response rate estimation block.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, technical scheme is further elaborated.
Embodiment 1
Present embodiments providing a kind of electric vehicle brake power response rate evaluation method, it uses Brake energy recovery rate to estimate Calculation system is estimated, described Brake energy recovery rate estimating system includes: braking torque computing module 201, braking energy are estimated Calculate module 202 and Brake energy recovery rate estimation block 203；Wherein said electric motor car includes EV, HEV and PHEV, it include with Lower step:
S10, braking torque computing module are according to four the wheel cylinder systems gathered under the conditions of closing braking energy recovering function Dynamic pressure calculates car load frictional damping moment of torsion, according to four the wheel cylinder brakings gathered under the conditions of opening braking energy recovering function Calculation of pressure car load frictional damping moment of torsion.
In the present embodiment, described four wheel cylinder brake pressures are: the near front wheel wheel cylinder brake pressure, off-front wheel wheel cylinder are braked Pressure, left rear wheel wheel cylinder brake pressure and off hind wheel wheel cylinder brake pressure.
S20, braking energy estimation block utilize the car load under the conditions of the closedown braking energy recovering function that step S10 is estimated The braking energy dissipated by brake during frictional damping moment of torsion estimation brakeless energy regenerating；Utilize the closedown that step S10 is estimated Car load frictional damping moment of torsion under the conditions of braking energy recovering function rubs with the car load opened under the conditions of braking energy recovering function Wipe the braking energy that the difference estimation motor of braking torque reclaims；
The braking energy that the motor that S30, Brake energy recovery rate estimation block utilize step S20 to estimate reclaims calculates braking Energy recovery rate.
In the present embodiment, by formula Ttotal_W/o=(pfr_W/o+pfl_W/o)×Cpfront+(prr_W/o+prl_W/o)×Cprear Calculate car load frictional damping torque T under the conditions of closedown braking energy recovering functiontotal_W/o。
In formula, pfl_W/oFor the near front wheel wheel cylinder brake pressure under the conditions of closedown braking energy recovering function；pfr_W/oFor closing Close the off-front wheel wheel cylinder brake pressure under the conditions of braking energy recovering function；prl_W/oFor closing braking energy recovering function condition Under left rear wheel wheel cylinder brake pressure；prr_W/oFor the off hind wheel wheel cylinder brake pressure under the conditions of closedown braking energy recovering function； CpfrontFor front axle brake pressure and braking torque conversion coefficient, CprearFor rear axle brake pressure and braking torque conversion coefficient.
Further, by formula Ttotal_W=(pfr_W+pfl_W)×Cpfront+(prr_W+prl_W)×CprearCalculate and open braking Car load frictional damping torque T under the conditions of energy recovery functiontotal_W。
In formula, pfl_WFor the near front wheel wheel cylinder brake pressure under the conditions of unlatching braking energy recovering function；pfr_WFor the system of opening Energy reclaims the off-front wheel wheel cylinder brake pressure under functional conditions；prl_WFor the left side under the conditions of unlatching braking energy recovering function Trailing wheel wheel cylinder brake pressure；prr_WFor the off hind wheel wheel cylinder brake pressure under the conditions of unlatching braking energy recovering function；CpfrontFor Front axle brake pressure and braking torque conversion coefficient, CprearFor rear axle brake pressure and braking torque conversion coefficient.
In the present embodiment, pass through formula:Calculate electricity The braking energy that machine reclaims；In formula, PgenThe braking power reclaimed for motor；nmotorFor motor speed, ηgenImitate for electric power generation Rate, ηdrivertrainFor drive line efficiency, Ttotal_W/oFor closing car load frictional damping moment of torsion during braking energy recovering function, Ttotal_WFor opening car load frictional damping moment of torsion during braking energy recovering function.
In the present embodiment, pass through formula:Calculate Brake energy recovery rate.
In formula, ξregFor Brake energy recovery rate, vxFor speed, r is radius of wheel, and Δ t is the sampling time.
The sequencing of above example only for ease of describing, does not represent the quality of embodiment.
Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit；Although With reference to previous embodiment, the present invention is described in detail, it will be understood by those within the art that: it still may be used So that the technical scheme described in foregoing embodiments to be modified, or wherein portion of techniques feature is carried out equivalent； And these amendment or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and Scope.

Claims (6)

1. an electric vehicle brake power response rate evaluation method, it is characterised in that comprise the following steps:
S10, calculate car loads friction system according to closing four the wheel cylinder brake pressures gathered under the conditions of braking energy recovering function Dynamic torque, four wheel cylinder brake pressures according to being gathered under the conditions of opening braking energy recovering function calculate car load frictional damping Moment of torsion；
S20, utilize that step S10 estimates close the car load frictional damping moment of torsion under the conditions of braking energy recovering function and the system of opening Energy reclaims the braking energy that the difference estimation motor of the car load frictional damping moment of torsion under functional conditions reclaims；
The braking energy that S30, the motor utilizing step S20 to estimate reclaim calculates Brake energy recovery rate.
Electric vehicle brake power response rate evaluation method the most according to claim 1, it is characterised in that described four wheel cylinders Brake pressure is the near front wheel wheel cylinder brake pressure, off-front wheel wheel cylinder brake pressure, left rear wheel wheel cylinder brake pressure and off hind wheel wheel Cylinder brake pressure.
Electric vehicle brake power response rate evaluation method the most according to claim 2, it is characterised in that pass through formula:
Ttotal_W/o=(pfr_W/o+pfl_W/o)×Cpfront+(prr_W/o+prl_W/o)×Cprear；
Calculate car load frictional damping torque T under the conditions of closedown braking energy recovering functiontotal_W/o；
In formula, pfl_W/oFor the near front wheel wheel cylinder brake pressure under the conditions of closedown braking energy recovering function；pfr_W/oFor the system of closing Energy reclaims the off-front wheel wheel cylinder brake pressure under functional conditions；prl_W/oUnder the conditions of closing braking energy recovering function Left rear wheel wheel cylinder brake pressure；prr_W/oFor the off hind wheel wheel cylinder brake pressure under the conditions of closedown braking energy recovering function； CpfrontFor front axle brake pressure and braking torque conversion coefficient, CprearFor rear axle brake pressure and braking torque conversion coefficient.
Electric vehicle brake power response rate evaluation method the most according to claim 3, it is characterised in that pass through formula
Ttotal_W=(pfr_W+pfl_W)×Cpfront+(prr_W+prl_W)×Cprear；
Calculate and open car load frictional damping torque T under the conditions of braking energy recovering functiontotal_W；
In formula, pfl_WFor the near front wheel wheel cylinder brake pressure under the conditions of unlatching braking energy recovering function；pfr_WFor opening Brake Energy Amount reclaims the off-front wheel wheel cylinder brake pressure under functional conditions；prl_WFor the left rear wheel under the conditions of unlatching braking energy recovering function Wheel cylinder brake pressure；prr_WFor the off hind wheel wheel cylinder brake pressure under the conditions of unlatching braking energy recovering function；CpfrontFor front axle Brake pressure and braking torque conversion coefficient, CprearFor rear axle brake pressure and braking torque conversion coefficient.
Electric vehicle brake power response rate evaluation method the most according to claim 4, it is characterised in that pass through formula:
P g e n = n m o t o r × 2 π × ( T t o t a l _ W / o - T t o t a l _ W ) i × η d r i v e r t r a i n × η g e n ;
Calculate the braking energy that motor reclaims；
In formula, PgenThe braking power reclaimed for motor；nmotorFor motor speed, ηgenFor electric power generation efficiency, ηdrivertrainFor Drive line efficiency, Ttotal_W/oFor closing car load frictional damping moment of torsion during braking energy recovering function, Ttotal_WFor opening braking Car load frictional damping moment of torsion during energy recovery function.
Electric vehicle brake power response rate evaluation method the most according to claim 5, it is characterised in that pass through formula:
ξ r e g = Σ P g e n × Δ t Σ T t o t a l _ W / o × v x r × Δ t × 100 % ,
Calculate Brake energy recovery rate；
In formula, ξregFor Brake energy recovery rate, vxFor speed, r is radius of wheel, and Δ t is the sampling time.
CN201610532621.3A 2016-07-07 2016-07-07 Electric vehicle brake power response rate evaluation method Pending CN106183833A (en)

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Application Number Priority Date Filing Date Title
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107310397A (en) * 2017-05-18 2017-11-03 奇瑞汽车股份有限公司 A kind of computational methods of brake energy recovering system energy recovery rate
CN108152742A (en) * 2018-03-20 2018-06-12 安徽江淮汽车集团股份有限公司 A kind of vehicle generator efficiency test method
CN110307996A (en) * 2019-06-17 2019-10-08 吉林大学 A kind of braking of battery electric vehicle energy recovery rate test method
CN111645536A (en) * 2020-06-05 2020-09-11 中国第一汽车股份有限公司 Method for controlling driving torque of electric four-wheel drive automobile
CN111660821A (en) * 2020-05-29 2020-09-15 北京新能源汽车股份有限公司 Control method and control device for energy recovery of electric automobile

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107310397A (en) * 2017-05-18 2017-11-03 奇瑞汽车股份有限公司 A kind of computational methods of brake energy recovering system energy recovery rate
CN108152742A (en) * 2018-03-20 2018-06-12 安徽江淮汽车集团股份有限公司 A kind of vehicle generator efficiency test method
CN110307996A (en) * 2019-06-17 2019-10-08 吉林大学 A kind of braking of battery electric vehicle energy recovery rate test method
CN110307996B (en) * 2019-06-17 2020-12-11 吉林大学 Method for testing braking energy recovery rate of pure electric vehicle
CN111660821A (en) * 2020-05-29 2020-09-15 北京新能源汽车股份有限公司 Control method and control device for energy recovery of electric automobile
CN111645536A (en) * 2020-06-05 2020-09-11 中国第一汽车股份有限公司 Method for controlling driving torque of electric four-wheel drive automobile
CN111645536B (en) * 2020-06-05 2021-10-01 中国第一汽车股份有限公司 Method for controlling driving torque of electric four-wheel drive automobile

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Application publication date: 20161207