CN107719132A - A kind of evaluation method of braking energy of electric automobiles organic efficiency - Google Patents
A kind of evaluation method of braking energy of electric automobiles organic efficiency Download PDFInfo
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- CN107719132A CN107719132A CN201710764532.6A CN201710764532A CN107719132A CN 107719132 A CN107719132 A CN 107719132A CN 201710764532 A CN201710764532 A CN 201710764532A CN 107719132 A CN107719132 A CN 107719132A
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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
- B60L7/18—Controlling the braking effect
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Abstract
The invention discloses a kind of evaluation method of braking energy of electric automobiles organic efficiency, this method judges whether to open regenerative braking by severity of braking, when electric automobile is operated in regenerative braking, the total braking energy of electric automobile is determined using electric vehicle brake initial velocity.According to recyclable braking energy and energy flow process, the Brake energy recovery efficiency evaluation index for considering control for brake Link Efficiency, mechanical drive department component efficiency, electric power generation efficiency and battery charge efficiency is provided.Pass through the test analysis to motor braking torque, rotating speed and battery pack state-of-charge to energy recovery efficiency, dynamo battery associated efficiency is carried out curve fitting, and energy regenerating overall efficiency model is established, Brake energy recovery overall efficiency reflects electric automobile to total Brake energy recovery utilization ratio.The present invention reflects effect of the Brake energy recovery to raising vehicle efficiency, and effective method is provided to improve and improving the Brake energy recovery efficiency of electric automobile.
Description
Technical field
The present invention relates to braking energy of electric automobiles recovery technology field, more specifically to a kind of electric automobile system
The evaluation method of energy organic efficiency.
Background technology
One most important difference of electric automobile and conventional fuel oil automobile is exactly that electric automobile can realize that braking energy returns
Receive, the energy that a part of conventional fuel oil automobile loses in braking procedure is reclaimed, so as to improve the continual mileage of electric automobile.Electricity
During electrical automobile descending, the braking of vehicle, deceleration energy regenerating are stored, discharge use again until going up a slope, so not only
The energy can be saved, use cost can also be reduced.In urban transportation, frequently accelerate and slow down due to needing, Brake Energy
Amount recovery equally has significant economic value.
During electric vehicle brake, in addition to the inertia energy that air drag and running resistance consume, it is always desirable to maximum
Limit using regenerative braking to reclaim braking energy as much as possible, but motor participates in shadow of the braking by many factors
Ring, therefore the recoverable energy of institute is also by many limitations.In addition, only have the braking energy of driving wheel can on electric automobile
To be sent to motor along connected drive shaft, electrical power storage is converted into battery by motor, another part system
Energy will be consumed by the friction catch on wheel in the form of heat energy.In addition, during Brake energy recovery, energy
Each part of amount transmission link and energy storage system also results in energy loss.As can be seen here, braking energy of electric automobiles returns
Receipts process is a complicated dynamic process, and it is many to influence the factor of Brake energy recovery efficiency, between each influence factor mutually
Restrict.How the determinative factor of tool is selected to be evaluated in numerous influence factors, and to Brake energy recovery system
System optimizes, and is the key for improving braking energy recovery system for electric vehicle efficiency.
The content of the invention
It is an object of the invention to provide a kind of braking energy of electric automobiles organic efficiency evaluation method, for electric automobile system
Efficiency problem in energy removal process, according to recyclable braking energy and energy flow process, proposition considers system
Dynamic controlling unit, mechanical driving part, the Brake energy recovery efficiency evaluation index of dynamo battery associated efficiency many factors,
The maximization of Brake energy recovery is realized, farthest improves the capacity usage ratio of electric automobile.
The in order to solve the above-mentioned technical problem used technical scheme of the present invention is：
A kind of braking energy of electric automobiles organic efficiency evaluation method, comprises the following steps：
(1) judge whether to open regenerative braking by severity of braking, when electric automobile is operated in regenerative braking, into step
Suddenly (2)；Otherwise non-renewable braking is entered；
(2) electric vehicle brake initial velocity is utilized, and the total braking energy of electric automobile is determined according to kerb weight；
(3) recyclable braking energy is obtained by total braking energy, and control for brake link is provided according to energy flow process
Efficiency, mechanical drive department component efficiency, electric power generation efficiency and battery charge efficiency；
(4) by the test of motor braking torque, rotating speed and battery pack state-of-charge (SOC) to energy recovery efficiency
Analysis, comprehensive electric power generation efficiency and battery charge efficiency obtain dynamo battery associated efficiency；
(5) obtaining step 3) and step 4) data message, braking energy of electric automobiles recovery overall efficiency model is established, it is right
Braking energy of electric automobiles organic efficiency carries out overall merit.
In described step (1), when the total severity of braking of electric automobile is no more than 0.7, motor regenerative braking is opened, remaining
Situation is then not turned on regenerative braking；And in the process of regenerative braking, the ratio that regenerative braking force accounts for total braking force is more, then again
Raw braking power is bigger, and the energy stored at the end of braking procedure in the battery is more；When described electric automobile work is in
During regenerative braking, a part of even all of brake force is provided by motor, one is reclaimed while automobile braking safety is ensured
Partial brake energy stores are in the battery.
When the total braking energy of described electric automobile is brakes initial, kinetic energy caused by electric automobile translatory mass and rotation
Kinetic energy sum caused by quality.
The recyclable braking energy of described electric automobile consumes gross energy by total braking energy, rolling friction and air hinders
Power consumption gross energy synthesis determines.
The principal element of the described recyclable Brake energy recovery of influence includes driving cycle, motor, battery and control
Strategy.
Described control strategy uses series control strategy.
Accounting of the braking energy that described control for brake Link Efficiency refers to reclaim at driving wheel in braking energy；Institute
State mechanical drive department component efficiency and represent that braking energy is flowed to the average operation of transmission system during energy storage device by driving wheel
The mechanical input energy of efficiency, i.e. motor side inputs the ratio between energy of transmission system with driving wheel；The electric power generation efficiency is
Braking energy is flowed to the average generating efficiency of motor controller during battery by driving wheel；The battery charge efficiency is
Average charge energy efficiency of the battery in charging process.
Described dynamo battery associated efficiency depends on the generating efficiency of motor and the charge efficiency of battery, and it is right first to refer to
Motor braking torque, rotating speed and the single factor changes of battery pack SOC are tested the affecting laws of energy recovery efficiency, so
The coupled relation of each factor is analyzed afterwards, motor and battery are obtained by way of curve matching under different input conditions
Associated working efficiency.
The braking energy of electric automobiles recovery overall efficiency refers to be recovered and be stored into battery in total braking energy
Part energy ratio shared in total braking energy；Described braking energy of electric automobiles recovery overall efficiency passes through comprehensive
Close the braking energy of electric automobiles that control for brake Link Efficiency, mechanical drive department component efficiency and dynamo battery associated efficiency are established
Overall efficiency model is reclaimed to reflect.
Beneficial effects of the present invention are：The present invention considers according to recyclable braking energy and energy flow process
Control for brake Link Efficiency, mechanical drive department component efficiency, electric power generation efficiency and battery charge efficiency, propose effective braking
Energy recovery efficiency evaluation index, and establish energy regenerating overall efficiency model.This method consider driving cycle, motor,
Battery and control strategy factor, so as to more fully reflect effect of the Brake energy recovery to raising vehicle efficiency, to carry
Brake energy recovery efficiency that is high and improving electric automobile provides effective method.
Brief description of the drawings
Fig. 1 is the flow chart of braking energy of electric automobiles organic efficiency evaluation method of the present invention；
Fig. 2 is energy loss schematic diagram in braking energy of electric automobiles removal process of the present invention；
Fig. 3 is speed factor of influence provided in an embodiment of the present invention；
Fig. 4 is battery factor of influence provided in an embodiment of the present invention；
Fig. 5 is energy regenerating associated efficiency provided in an embodiment of the present invention.
Embodiment
The flow of braking energy of electric automobiles organic efficiency evaluation method of the present invention as shown in figure 1, below in conjunction with accompanying drawing and
The present invention is described in further detail for embodiment.
A kind of braking energy of electric automobiles organic efficiency evaluation method of the present embodiment, comprises the following steps：
(1) judge whether to open regenerative braking by total severity of braking first, when electric automobile is braked, according to electricity
Electrical automobile kerb weight M and braking initial velocity V0, the total braking energy of electric automobile is determined, described electric automobile is always braked
When energy is brakes initial, kinetic energy caused by electric automobile translatory mass and kinetic energy sum caused by gyrating mass.For the ease of
Calculate, typically the inertia couple of vehicle gyrating mass is converted into the inertia force of translatory mass, and revolved using coefficient δ as being included in
Electric automobile correction coefficient of rotating mass after Pignus pignoris amount inertia couple.Electric automobile relies on motor and battery driven, does not have
There is cluster engine, the gyrating mass of automobile only considers wheel, influence all very littles of other transmission devices, generally takes δ=1.04, obtains
It is E to the total braking energy of electric automobile0=0.52MV0 2。
(2) judge whether to open regenerative braking by severity of braking, when the total severity of braking of electric automobile is no more than 0.7,
Motor regenerative braking is opened, remaining situation is then not turned on regenerative braking；And in the process of regenerative braking, regenerative braking force accounts for always
The ratio of brake force is more, then regenerative brake power is bigger, and the energy being stored at the end of braking procedure in battery is more；When
When described electric automobile work is in regenerative braking, a part of even all of brake force is provided by motor, is ensureing automobile
A part of braking energy storage is reclaimed while braking safety in the battery.
(3) the recyclable braking energy of electric automobile described in consumes gross energy and sky by total braking energy, rolling friction
Atmidometer consumption gross energy synthesis determines.
During electric vehicle brake, the driving force acted on wheel makes a concerted effort include force of rolling friction, air drag, climb
Slope resistance and acceleration resistance.When electric vehicle brake, acceleration resistance is brake force.Electric automobile is operated under the operating mode of city
When, grade resistance can be neglected.Therefore recyclable gross energy E is obtainedb=η0η1η2η3(E0-Ef-Ew), wherein, η0For control for brake ring
Save efficiency, η1For mechanical drive department component efficiency, η2For electric power generation efficiency, η3For battery charge efficiency, EfConsumed for rolling friction
Gross energy, EwGross energy is consumed for air drag.
(4) in braking energy of electric automobiles removal process, each part of energy transmission link and energy storage system can be led
Cause energy loss.Fig. 2 is energy loss schematic diagram in braking energy of electric automobiles removal process of the present invention, as shown in Fig. 2 in car
The recyclable braking energy that can be obtained at wheel along transfer route transmit when loss step by step.By wheel, portion of energy
By the friction of friction catch and bearing and rotary inertia is overcome to consume, the regenerating braking energy for being delivered to driving wheel progressively subtracts
It is few, and a part is lost by speed changer and motor in follow-up transmittance process in driving wheel braking energy, meanwhile, motor returns
The energy of feedback also consumes portion of energy in energy storage system.In general, because machinery driving efficiency is very high and steady
Fixed, influenceing the principal element of Brake energy recovery includes driving cycle, motor, battery and control strategy.
A) driving cycle
Braking frequently, severity of braking small driving cycle, such as city state of cyclic operation again, at this moment can make full use of motor
Regenerative braking is carried out, therefore recyclable braking energy is also more；, whereas if damped condition is few and severity of braking is larger
Driving cycle, to ensure braking safety, regenerative braking should be reduced as far as possible, so as to which recyclable braking energy is also got over
It is few.
B) motor
Motor is operated in Generator Status during electric automobile regenerative braking, its torque-output characteristics with it is defeated under motoring condition
It is essentially identical to go out characteristic, when motor speed is higher than rated speed, motor is braked with rated power, when motor speed is less than specified turn
Speed, motor are braked with nominal torque.During electric vehicle brake, as speed reduces, motor speed reduces, armature counter electromotive force drop
Low, when motor speed drops to 500r/min, regenerative braking force is reduced to 0N, regenerative braking failure.Thus, to motor regenerative torque
TregIt is modified Treg=λ (V) T 'reg, wherein, T 'regFor Rated motor torque, λ (V) is speed factor of influence, and Fig. 3 is shown
Speed factor of influence provided in an embodiment of the present invention, wherein abscissa are speed, and ordinate is speed factor of influence.
C) battery
When regenerative brake current is filled with battery, the braking power of motor plays protection no more than the chargeable power of battery
The effect of battery.Because the whole braking procedure time is very short, SOC, temperature and the internal resistance of battery, which are believed that, keeps constant, battery
Open-circuit voltage keeps constant, and whole braking procedure battery can keep maximum charge power to be charged.In braking procedure, if returning
Battery overcharge can excessively be caused by receiving energy, so as to greatly shorten the cycle life of battery.The present embodiment, which introduces battery, to be influenceed
Factor lambda (SOC) limits recovery braking energy, wherein, λ (SOC) is the nonlinear function on SOC, the relation of the two such as Fig. 4
Shown, wherein abscissa is battery charge state, and ordinate is battery factor of influence.
D) control strategy
After matching motor and battery according to actual operation requirements and design idea, used braking force control strategy is
Determine recovery braking energy number, which specify the substantially allocation proportion relation of regenerative braking force and mechanical braking force.System
Dynamic control strategy mainly has Parallel Control strategy and the major class of series control strategy two, and in general, series control strategy is obvious
Higher than Parallel Control strategy.
(5) Brake energy recovery efficiency is determined, it mainly includes control for brake Link Efficiency, mechanical driving part effect
The average efficiency of rate, electric power generation efficiency and battery charge efficiency four processes.Described control for brake Link Efficiency refers to drive
Accounting of the braking energy reclaimed at driving wheel in braking energy；The mechanical drive department component efficiency represents braking energy by driving
It is defeated to the average operation efficiency of transmission system during energy storage device, the i.e. mechanical input energy of motor side and driving wheel in turn
Enter the ratio between energy of transmission system；The electric power generation efficiency be braking energy by driving wheel flow to during battery motor and
The average generating efficiency of controller；The battery charge efficiency is average charge energy efficiency of the battery in charging process.
A) control for brake Link Efficiency η0
Control for brake Link Efficiency is accounting of the braking energy in braking energy reclaimed at driving wheel, its numerical value it is big
It is small to depend on several factors, mainly include Brake energy recovery control strategy, operating condition, vehicle dynamical system.
B) mechanical driving part efficiency eta1
Mechanical drive department component efficiency represents that braking energy flows to the flat of transmission system during energy storage device by driving wheel
The mechanical input energy of equal operating efficiency, i.e. motor side inputs the ratio between energy of transmission system with driving wheel.For particular vehicle
For, its mechanical drive department component efficiency is substantially fixed.
C) electric power generation efficiency eta2
Electric power generation efficiency is braking energy flows to being averaged for motor controller during energy storage device by driving wheel
Generating efficiency.In braking procedure, energy regenerating should not be carried out when speed is too low, as motor speed raises, energy returns
Rate of producing effects increase, and as rotating speed and the change of torque, electric power generation efficiency are also changing.
D) battery charge efficiency η3
Battery charge efficiency is average charge energy efficiency of the battery in charging process.The charge characteristic of battery is charged
Electric current, temperature and the influence in charging interval, battery terminal voltage can with battery SOC, charging current change and change, charging effect
Rate can be different with the change of SOC and charging current.
(6) dynamo battery associated efficiency is determined according to electric power generation efficiency and battery charge efficiency.The charging current of battery
For motor DC side electric current, motor DC side voltage is battery terminal voltage, and the working condition of motor and both batteries is closely related,
Consider the associated working efficiency of motor and battery, could truly reflect actual operating efficiency.
In process of regenerative braking, motor braking torque, rotating speed and battery pack SOC have an impact to energy recovery efficiency.
The present embodiment is changed to energy recovery efficiency by power assembly of electric automobile property test platform to single factor first
Affecting laws are tested, and then the coupled relation of each factor is analyzed.Experiment is with motor rated power/rotating speed
15kw/2000(r/min)；Battery capacity is 336v/100Ah, between battery pack SOC value is 0.2~0.8.By changing electricity
Machine different rotating speeds, torque value, the dynamo battery associated working efficiency of motor, battery under different input conditions, institute can be obtained
The dynamo battery associated efficiency stated depends on the generating efficiency of motor and the charge efficiency of battery, refers to first to motor and battery
Single factor change is tested the affecting laws of energy recovery efficiency, and then the coupled relation of each factor is analyzed,
By changing motor different rotating speeds, torque value and battery pack SOC parameter, and motor and electricity are obtained by way of curve matching
Associated working efficiency of the pond under different input conditions.It is illustrated in figure 5 energy regenerating joint effect provided in an embodiment of the present invention
Rate, wherein X-coordinate are motor speed, and Y-coordinate is braking moment, and Z coordinate is energy regenerating associated efficiency.As seen from Figure 5, it is electric
Mechanical, electrical pond associated working efficiency changes between 50% to 90%, if therefore controlled motor battery works in regenerative braking
In combined highly effective region, the energy recovery efficiency of regeneration brake system will can be effectively improved.
(7) during Brake energy recovery, dynamo battery associated efficiency is by motor braking torque, rotating speed and battery pack
SOC multifactor impacts, and factors above is not independent, is intercoupled together, and these information can be based on above-mentioned (6)
In data, obtained by way of curve matching.According to the generating efficiency η of motor2, the charge efficiency η of battery3, obtain motor
Battery associated working efficiency is η23=η2×η3.According to the analysis to measured data, structure dynamo battery associated efficiency model η23
=f (n, T, SOC), energy regenerating associated efficiency is carried out curve fitting using cubic polynomial.
(8) according to above related data information, it is as follows to establish braking energy of electric automobiles recovery overall efficiency model
The braking energy of electric automobiles recovery overall efficiency refers to be recovered and be stored into battery in total braking energy
Part energy ratio shared in total braking energy；Described braking energy of electric automobiles recovery overall efficiency passes through comprehensive
Close the braking energy of electric automobiles that control for brake Link Efficiency, mechanical drive department component efficiency and dynamo battery associated efficiency are established
Overall efficiency model is reclaimed to reflect.
It can thus be seen that Brake energy recovery overall efficiency reflects electric automobile utilizes effect to total Brake energy recovery
Rate.Brake energy recovery efficiency depends mainly on the size of each link average efficiency and state of cyclic operation.Each link average efficiency is high
It is not necessarily mean that Brake energy recovery efficiency is just necessarily very high.It is no frequently to add if actual operating mode is more steady
Decelerating mode, most of driving energy are all consumed in terms of rolling resistance and air drag is overcome, and are available for the braking energy of recovery
Just seldom, therefore even if each link average efficiency is very high, but Brake energy recovery efficiency is also not necessarily very high.
The present embodiment according to recyclable braking energy and energy flow process, consider control for brake Link Efficiency,
Mechanical drive department component efficiency, electric power generation efficiency and battery charge efficiency, provide effective Brake energy recovery efficiency rating
Index, and establish energy regenerating overall efficiency model.This method consider driving cycle, motor, battery and control strategy because
Element, so as to more fully reflect effect of the Brake energy recovery to raising vehicle efficiency, to improve and improving electric automobile
Brake energy recovery efficiency provide effective method.
Claims (9)
1. a kind of braking energy of electric automobiles organic efficiency evaluation method, it is characterised in that comprise the following steps：
(1) judge whether to open regenerative braking by severity of braking, when electric automobile is operated in regenerative braking, into step
(2)；Otherwise non-renewable braking is entered；
(2) electric vehicle brake initial velocity is utilized, and the total braking energy of electric automobile is determined according to kerb weight；
(3) recyclable braking energy is obtained by total braking energy, and according to energy flow process provide control for brake Link Efficiency,
Mechanical drive department component efficiency, electric power generation efficiency and battery charge efficiency；
(4) it is comprehensive by the test analysis to motor braking torque, rotating speed and battery pack state-of-charge to energy recovery efficiency
Electric power generation efficiency and battery charge efficiency obtain dynamo battery associated efficiency；
(5) obtaining step 3) and step 4) data message, braking energy of electric automobiles recovery overall efficiency model is established, to electronic
Recovering Waste Energy of Braking in Automobiles efficiency carries out overall merit.
2. a kind of braking energy of electric automobiles organic efficiency evaluation method according to claim 1, it is characterised in that described
The step of (1) in, when the total severity of braking of electric automobile is no more than 0.7, open motor regenerative braking, remaining situation is then not turned on
Regenerative braking；And in the process of regenerative braking, the ratio that regenerative braking force accounts for total braking force is more, then regenerative brake power is got over
Greatly, the energy stored at the end of braking procedure in the battery is more；When described electric automobile work is in regenerative braking, by
Motor provides a part of even all of brake force, reclaims a part of braking energy while automobile braking safety is ensured and deposits
Storage is in the battery.
3. a kind of braking energy of electric automobiles organic efficiency evaluation method according to claim 1, it is characterised in that described
The total braking energy of electric automobile to brake initial when, move caused by kinetic energy caused by electric automobile translatory mass and gyrating mass
Can sum.
4. a kind of braking energy of electric automobiles organic efficiency evaluation method according to claim 1, it is characterised in that described
Electric automobile recyclable braking energy gross energy and air drag consumed by total braking energy, rolling friction consume gross energy
It is comprehensive to determine.
5. a kind of braking energy of electric automobiles organic efficiency evaluation method according to claim 1, it is characterised in that described
The principal element of the recyclable Brake energy recovery of influence include driving cycle, motor, battery and control strategy.
A kind of 6. braking energy of electric automobiles organic efficiency evaluation method according to claim 1 or 5, it is characterised in that
Described control strategy uses series control strategy.
7. a kind of braking energy of electric automobiles organic efficiency evaluation method according to claim 1, it is characterised in that described
Control for brake Link Efficiency refer to accounting of the braking energy in braking energy reclaimed at driving wheel；The mechanical drive department
Component efficiency represents that braking energy is flowed to the average operation efficiency of transmission system during energy storage device, i.e. motor side by driving wheel
The ratio between energy of mechanical input energy and driving wheel input transmission system；The electric power generation efficiency is braking energy by driving
In turn to the average generating efficiency of motor controller during battery；The battery charge efficiency is battery in charging process
In average charge energy efficiency.
8. a kind of braking energy of electric automobiles organic efficiency evaluation method according to claim 1, it is characterised in that described
Dynamo battery associated efficiency depend on motor generating efficiency and battery charge efficiency, refer to first to motor braking turn
Square, rotating speed and the single factor changes of battery pack SOC are tested the affecting laws of energy recovery efficiency, then to each factor
Coupled relation analyzed, the associated working of motor and battery under different input conditions is obtained by way of curve matching
Efficiency.
9. a kind of braking energy of electric automobiles organic efficiency evaluation method according to claim 1, it is characterised in that described
Braking energy of electric automobiles recovery overall efficiency refers to be recovered and be stored into total braking energy the part energy in battery
The shared ratio in total braking energy；Described braking energy of electric automobiles recovery overall efficiency passes through synthetical restraint control ring
Save the braking energy of electric automobiles recovery overall efficiency that efficiency, mechanical drive department component efficiency and dynamo battery associated efficiency are established
Model reflects.
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| CN114325174A (en) * | 2021-12-08 | 2022-04-12 | 一汽奔腾轿车有限公司 | Electric drive system efficiency evaluation method for electric vehicle |
| CN114509282A (en) * | 2022-03-28 | 2022-05-17 | 东风汽车集团股份有限公司 | Energy efficiency evaluation method and system for hybrid electric vehicle braking energy recovery system based on whole vehicle working condition |
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| CN108615125A (en) * | 2018-06-08 | 2018-10-02 | 中机生产力促进中心 | A kind of brake energy recovering system comprehensive performance evaluation method |
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| CN109614702A (en) * | 2018-12-11 | 2019-04-12 | 合肥工业大学 | A kind of matching process of Recovering Waste Energy of Braking in Automobiles |
| CN109614702B (en) * | 2018-12-11 | 2023-03-24 | 合肥工业大学 | Matching method for automobile braking energy recovery |
| CN110103724B (en) * | 2019-05-06 | 2021-11-30 | 奇瑞汽车股份有限公司 | Control method of electric drive system with braking function |
| CN110103724A (en) * | 2019-05-06 | 2019-08-09 | 奇瑞汽车股份有限公司 | A kind of control method for the power drive system having braking function |
| CN114325174A (en) * | 2021-12-08 | 2022-04-12 | 一汽奔腾轿车有限公司 | Electric drive system efficiency evaluation method for electric vehicle |
| CN114325174B (en) * | 2021-12-08 | 2023-11-21 | 一汽奔腾轿车有限公司 | Efficiency evaluation method for electric drive system of electric vehicle |
| CN114509282A (en) * | 2022-03-28 | 2022-05-17 | 东风汽车集团股份有限公司 | Energy efficiency evaluation method and system for hybrid electric vehicle braking energy recovery system based on whole vehicle working condition |
| CN114509282B (en) * | 2022-03-28 | 2023-05-16 | 东风汽车集团股份有限公司 | Energy efficiency evaluation method and system for braking energy recovery system of hybrid electric vehicle based on whole vehicle working condition |
| CN117162793A (en) * | 2023-11-03 | 2023-12-05 | 格陆博科技有限公司 | Electric automobile power recovery method and system |
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