CN102381178B - Plug-in hybrid electric vehicle power system and regenerative brake control method for same - Google Patents

Plug-in hybrid electric vehicle power system and regenerative brake control method for same Download PDF

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Publication number
CN102381178B
CN102381178B CN201110243761.6A CN201110243761A CN102381178B CN 102381178 B CN102381178 B CN 102381178B CN 201110243761 A CN201110243761 A CN 201110243761A CN 102381178 B CN102381178 B CN 102381178B
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regenerative brake
power
brake
regenerative
request
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CN201110243761.6A
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Chinese (zh)
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CN102381178A (en
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杨上东
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奇瑞汽车股份有限公司
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Abstract

The invention discloses a plug-in hybrid electric vehicle power system, which is provided with a front drive motor and a rear drive motor (11), wherein the front drive motor is a starting and generating integrated machine (12), and the rear drive motor (11) is connected with a high-tension battery (8). The invention further provides a regenerative brake control method for the power system. By the aid of the technical scheme, a mode based on priority is adopted for a four-wheel-drive plug-in hybrid electric vehicle, the brake torque of the front drive motor and the rear drive motor is distributed during regenerative brake, safety is ensured while the economical efficiency of the whole vehicle is improved, and the power system is low in cost, easy in realization and high in reliability.

Description

Plug-in hybrid-power automobile power system and regenerating brake control method thereof

Technical field

The invention belongs to the technical field of hybrid vehicle, relate to the technology of its power system, more particularly, the present invention relates to a kind of plug-in hybrid-power automobile power system.In addition, the invention still further relates to the regenerating brake control method that this power system adopts.

Background technology

Energy shock and ecological deterioration have become restriction global evolution key factor.The automobile of research energy-saving and environmental protection is one of effective means of alleviating Pressure on Energy, reduction environmental pollution.Because plug-in hybrid electric vehicle is one of the most feasible current new-energy automobile scheme, the exploitation of plug-in hybrid-power automobile has been carried out in domestic and international most of motor plant commercial city.Plug-in hybrid electric vehicle (PHEV), the characteristic feature having is:

1, external charge function, can obtain electric energy from electrical network;

2, pure motor driving function;

3, driving engine and motor carry out the function of energy hybrid, optimization system efficiency;

4, regenerative braking capability, can obtain the energy in car load braking procedure;

Compare with pure electric automobile (EV), PHEV can effectively solve the problem of continual mileage; With do not have the hybrid vehicle comparison (HEV) of external charge feature, PHEV has stronger electric running ability, can improve car load economy, reduce car load discharge by actv..PHEV has taken into account the advantage of pure electric automobile and hybrid electric vehicle as can be seen here, is one of new-energy automobile scheme of at present tool industrialization prospect.

PHEV regenerative braking capability reclaims the energy in braking procedure, and the energy of goading recovery in driving process into action discharges, and is one of key factor affecting car load economy.

Summary of the invention

The invention provides a kind of plug-in hybrid-power automobile power system, its objective is the car load economic performance that improves PHEV.

To achieve these goals, the technical scheme that the present invention takes is:

Plug-in hybrid-power automobile power system provided by the present invention, described plug-in hybrid-power automobile is provided with entire car controller, CAN bus, brake pedal, acceleration pedal, described power system is provided with the driving engine of before driving and Automatic Transmission, before driving motor, described before driving motor is connected with high-tension battery, and described before driving motor is starting-generating all-in-one; Described power system is also provided with rear drive motor, and described rear drive motor is connected with described high-tension battery.

Described power system is provided with pedal switch, and described pedal switch is connected with described entire car controller.

Described power system is provided with gear detector, and described gear detector is connected with described entire car controller.

Described high-tension battery is connected with described CAN bus by battery management system.

Described power system is provided with brake controller, and described brake controller is connected with described CAN bus.

The power circuit of described starting-generating all-in-one is connected with described high-tension battery by before driving electric machine controller.

The control circuit of described before driving electric machine controller is connected with described CAN bus.

The power circuit of described rear drive motor is connected with described high-tension battery by rear drive electric machine controller.

The control circuit of described rear drive electric machine controller is connected with described CAN bus.

Described Automatic Transmission is connected with described CAN bus by control unit for automatic shift.

Described driving engine is connected with described CAN bus by engine controller.

The regenerating brake control method that the present invention also provides above-described plug-in hybrid-power automobile power system to adopt, its technical scheme is:

First entire car controller detects the gear request of chaufeur, is neutral gear request if current, does not carry out regenerative brake;

If be not neutral gear request current, judgement is when whether vehicle in front is in slip state, if when vehicle in front is in slip state, do not carry out regenerative brake;

If current vehicles failed in slip state, judges whether high-tension battery connects, if high-tension battery, not in coupled situation, does not carry out regenerative brake;

If current high-tension battery in coupled situation, judges whether system has dependent failure, if system does not have dependent failure, do not carry out regenerative brake;

If system does not have dependent failure, judge whether chaufeur has unclamped acceleration pedal, if not release the gas pedal of chaufeur does not carry out regenerative brake;

If chaufeur release the gas pedal, judges brake pedal status, if chaufeur is stepped on brake pedal, enter forced brake state; If chaufeur is not stepped on brake pedal, enter unintended braking state;

Entering forced brake state or entering after unintended braking state, calculate regenerative braking torque request, further regenerative braking torque is distributed.

In described unintended braking state, entire car controller judges whether the speed of a motor vehicle is less than or equal to V1, if the speed of a motor vehicle is less than or equal to V1, by regenerative brake requested torque set zero; If the speed of a motor vehicle is greater than V1, carry out the calculating of regenerative brake requested torque, method of calculating is for to table look-up according to the speed of a motor vehicle, and this requested torque is wheel drive shaft moment of torsion; Described V1 is the vehicle speed value that exits regenerative brake of default.

In described regenerative braking torque distributes, entire car controller multiplies each other the regenerative brake requested torque obtaining in unintended braking state and current drive shaft speed, obtain regenerative brake request power A, to regenerative brake request power, A limits, prevent that excessive charge power from causing damage to battery, its method is for allowing charge power to compare regenerative brake request power A and battery, get smaller as the regenerative brake request power after limiting, thereby obtain regenerative brake request power B; Divided by drive shaft speed, obtain the regenerative braking torque value request T through restriction with regenerative brake request power B.

In described forced brake state, entire car controller judges whether the speed of a motor vehicle is less than or equal to V1, if the speed of a motor vehicle is less than or equal to V1, by regenerative brake requested torque set zero; If the speed of a motor vehicle is greater than V1, judge whether to receive the regenerative braking torque request from brake controller, if so, the requested torque of self-retention controller is set to regenerative brake requested torque; If do not receive the regenerative braking torque request of self-retention controller, to table look-up and try to achieve regenerative brake requested torque by the speed of a motor vehicle, this requested torque is wheel drive shaft moment of torsion; Described V1 is the vehicle speed value that exits regenerative brake of default.

In described regenerative braking torque distributes, entire car controller multiplies each other the regenerative brake requested torque obtaining in forced brake state and current drive shaft speed, obtain regenerative brake request power A, to regenerative brake request power, A limits, prevent that excessive charge power from causing damage to battery, its method is for allowing charge power to compare regenerative brake request power A and battery, get smaller as the regenerative brake request power after limiting, thereby obtain regenerative brake request power B; Divided by drive shaft speed, obtain the regenerative braking torque value request TA through restriction with regenerative brake request power B.

The present invention adopts technique scheme, and 4 wheel driven plug-in hybrid electric vehicle is adopted to the mode based on priority, drives the distribution of motor braking moment in process of regenerative braking before and after carrying out, and in ensureing safety, has improved the economy of car load; Cost is low, be easy to realize, reliability is high.

Brief description of the drawings

Below the mark in the each width accompanying drawing of this specification sheets expressed content and figure is briefly described:

Fig. 1 is 4 wheel driven plug-in type electromagnetic electrical automobile system construction drawing;

Fig. 2 is regenerative brake control flow chart;

Fig. 3 is unintended braking control process figure;

Fig. 4 is forced brake control process figure;

Fig. 5 is that regenerative braking torque distributes schematic diagram.

In figure, be labeled as:

1, entire car controller (VMS), 2, trailing wheel, 3, battery management system (BMS), 4, rear drive diff, 5, engine controller (EMS), 6, control unit for automatic shift (TCU), 7, brake controller (BCU), 8, high-tension battery, 9, rear drive electric machine controller (MCU2), 10, before driving electric machine controller (MCU1), 11, rear drive motor, 12, starting-generating all-in-one (ISG), 13, driving engine, 14, pedal switch, 15, Automatic Transmission (AMT), 16, front-wheel, 17, before driving diff, 18, brake pedal, 19, acceleration pedal, 20, gear detector (PRND), 21, CAN bus,

32, the gear request of chaufeur, 33, whether vehicle is in slip state, 34, whether high-tension battery connects, 35, whether system has dependent failure, 36, whether chaufeur has unclamped acceleration pedal, and 37, brake pedal status, 38, forced brake state, 39, unintended braking state, 40, regenerative braking torque distributes; 41, whether the speed of a motor vehicle is less than or equal to V1, and 42, requested torque set zero, 43, regenerative brake requested torque calculates; 44, whether the speed of a motor vehicle is less than or equal to V1,45, whether receive the regenerative braking torque request of BCU, 46, table look-up and try to achieve regenerative brake requested torque by the speed of a motor vehicle, 47, the requested torque of BCU is set to regenerative brake requested torque, 48, regenerative brake requested torque set zero; 49, regenerative brake request power, 50, regenerative brake request power after restriction, 51, regenerative braking torque value request, 52, judgement, 53, judgement, 54, assignment, 55, assignment, 56, assignment.

Detailed description of the invention

Contrast accompanying drawing below, by the description to embodiment, the specific embodiment of the present invention is described in further detail, to help those skilled in the art to have more complete, accurate and deep understanding to inventive concept of the present invention, technical scheme.

Structure of the present invention as expressed in Fig. 1, for a kind of plug-in hybrid-power automobile power system, described plug-in hybrid-power automobile is provided with entire car controller 1, CAN bus 21, brake pedal 18, acceleration pedal 19, described power system is provided with the driving engine 13 of before driving and Automatic Transmission 15 (AMT), before driving motor, and described before driving motor is connected with high-tension battery 8.

The present invention also proposes a kind of 4 wheel driven plug-in hybrid electric vehicle regenerating brake control method.

This 4 wheel driven PHEV can realize multiple driving mode, comprises electric-only mode (EV), series model, paralleling model, regenerative brake pattern.Because vehicle has driving engine 13, ISG motor (being starting-generating all-in-one 12) and 11 3 propulsions source of rear drive motor, this three not only possesses the ability of driving, also possesses the ability of braking, therefore in the time carrying out regenerative brake, how reasonably assignment system power is one of core control technology of four-drive hybrid electric.

In order to solve the problem existing at the current known technology described in this specification sheets background technology part and to overcome its defect, realize the goal of the invention of the car load economic performance that improves PHEV, the technical scheme that the present invention takes is:

As shown in Figure 1, plug-in hybrid-power automobile power system provided by the present invention, described before driving motor is starting-generating all-in-one 12 (i.e. ISG in figure); Described power system is also provided with rear drive motor 11, and described rear drive motor 11 is connected with described high-tension battery 8.

The present invention proposes a kind of regenerating brake control method, the method can effectively improve the car load economic performance of PHEV.The design of its technical scheme is: entire car controller detects brake pedal request, acceleration pedal request and the gear request of chaufeur, judge whether to carry out regenerative brake, carrying out when regenerative braking torque calculates calculating regenerative brake requested torque according to BCU and the speed of a motor vehicle, then carry out the lock torque distribution of front and back drive motor.

ISG is automobile start power generation all-in-one machine, directly being integrated on engine spindle, is exactly directly to substitute traditional starter motor with the larger motor of certain transient power, substitutes in short-term engine-driven car in the starting stage, and play the effect of start the engine simultaneously, reduce idling loss and the pollution of driving engine, while normally enforcement, motor-powered vehicle, this motor disconnects or plays the effect of electrical generator, when brake, this motor can also play regenerative electric power, reclaims the energy-saving effect of braking energy.This is a kind of energy-conservation and environmental protection scheme a kind of with low cost between hybrid power and orthodox car in a word.

Generally speaking, the regenerative brake of 4 wheel driven PHEV was made up of two stages, i.e. unintended braking and forced brake two parts:

1, unintended braking function: also claim sliding brake function, refer to that chaufeur is in driving procedure, release the gas pedal, driving engine 13 or motor apply certain braking force to car load, make car load have certain braking deceleration;

2, forced brake: refer to that chaufeur has stronger braking intention in the process of moving, by stepping on brake pedal request braking force, now motor can apply larger lock torque, to reclaim more energy.

In the time carrying out regenerative brake control, need to consider the state of motor, battery and driving engine, then carry out the distribution of regenerative brake power.

Dividing timing, rear drive has the highest priority; In the time that rear drive motor 11 can not meet regenerative brake demand, need to be by unnecessary lock torque demand assignment starting-generating all-in-one 12 (ISG motor) and the driving engine 13 to before driving.

While carrying out regenerative brake, need to consider the demand of car load traveling comfort, avoid the excessive or too small human discomfort causing of braking deceleration.Meanwhile, also need to consider the demand of safety, the regenerative braking torque applying should not cause the unstable of vehicle, within the scope that the brake torque that front and back wheel applies should allow at brake controller 7.

Brake controller 7 (BCU) is responsible for communicating with entire car controller 1 (VMS), and sends in real time regenerative braking moment request, needs vehicle slip rate to detect simultaneously, ensures best deceleration and stopping performance and the brake safe of vehicle; When it can send its status information to entire car controller 1 during in state of activation, thereby make entire car controller 1 stop regenerative brake.

Brake controller 7 refers generally to ABS or ESP, is referred to as BCU.In the time that locking appears in wheel, should exit regenerative brake pattern.

Fig. 1 is 4 wheel driven plug-in type electromagnetic electrical automobile system construction drawing.Also comprise following part:

Described power system is provided with pedal switch 14, and described pedal switch 14 is connected with described entire car controller 1.

Entire car controller 1 (VMS) detects the acceleration pedal 19 of chaufeur and the demand of brake pedal 18, explains driving request and the braking request of chaufeur, and wherein whether chaufeur applies brake pedal 18 and detect by pedal switch 14.

Described power system is provided with gear detector 20 (PRND), and described gear detector 20 (PRND) is connected with described entire car controller 1.The gear request of chaufeur detects by gear detector 20 (PRND).

Described high-tension battery 8 is connected with described CAN bus 21 by battery management system 3 (BMS).

Described power system is provided with brake controller 7, and described brake controller 7 is connected with described CAN bus 21.

The power circuit of described starting-generating all-in-one 12 is connected with described high-tension battery 8 by before driving electric machine controller 10 (MCU1).

The control circuit of described before driving electric machine controller 10 is connected with described CAN bus 21.

The power circuit of described rear drive motor 11 is connected with described high-tension battery 8 by rear drive electric machine controller 9 (MCU2).

Entire car controller 1 (VMS) drives forwards electric machine controller 10 (MCU1) and sends driving or power generation command, and before driving electric machine controller 10 (MCU1) is controlled starting-generating all-in-one 12 (ISG) and realized entire car controller 1 (VMS) torque request.

Entire car controller 1 (VMS) backward drive motor controller 9 (MCU2) sends driving or power generation command, and MCU2 controls rear drive motor and realizes torque command.Entire car controller 1 (VMS), by communicating by letter with engine controller 5 (EMS), can be realized start-stop and the moment of torsion control of driving engine 13.

The control circuit of described rear drive electric machine controller 9 is connected with described CAN bus 21.

Described Automatic Transmission 15 (AMT) is connected with described CAN bus 21 by control unit for automatic shift 6 (TCU).

Control unit for automatic shift 6 (TCU) is the control unit of Automatic Transmission 15 (AMT), realizes autoshift function.Control unit for automatic shift 6 (TCU) detects the state of high-tension battery 8 and reflects in real time to entire car controller 1 (VMS), control unit for automatic shift 6 (TCU) need to calculate the receptible maximum power of current high-tension battery 8 or electric current, and this signal is sent to entire car controller 1.

Described driving engine 13 is connected with described CAN bus 21 by engine controller 5 (EMS).

The before driving part of 4 wheel driven plug-in hybrid electric vehicle provided by the invention adopts driving engine 13 and integrated form ISG motor (being starting-generating all-in-one 12) coaxial parallel-connection, and by automatic transmission with hydraulic torque converter 15 (AMT) by transmission of power to before driving diff 17, then be passed to front-wheel 16; Rear-guard part is made up of rear drive motor 11 and fixed speed ratio change-speed box, and transmission of power, to rear drive diff 4, then is passed to trailing wheel 2.

Between VMS, BMS, MCU1, MCU2, EMS, TCU and BCU, just there is CAN bus to intercom mutually.

The regenerating brake control method that the present invention also provides above-described plug-in hybrid-power automobile power system to adopt, its technical scheme is as Fig. 2: as shown in regenerative brake control flow chart.

Its control process is as follows:

First entire car controller 1 detects the gear request 32 of chaufeur, is neutral gear request if current, does not carry out regenerative brake;

If be not neutral gear request current, judgement is when whether vehicle in front is in slip state 33, if when vehicle in front is in slip state, do not carry out regenerative brake;

If current vehicles failed in slip state, judges high-tension battery 8 and whether connects 34, if high-tension battery 8, not in coupled situation, does not carry out regenerative brake;

If current high-tension battery 8 in coupled situation, judges whether system has dependent failure 35, if system does not have dependent failure, do not carry out regenerative brake;

If system does not have dependent failure, judge whether chaufeur has unclamped acceleration pedal 36, if not release the gas pedal 19 of chaufeur does not carry out regenerative brake;

If chaufeur release the gas pedal 19, judges brake pedal status 37, if chaufeur is stepped on brake pedal 19, enter forced brake state 38; If chaufeur is not stepped on brake pedal 19, enter unintended braking state 39;

Entering described forced brake state 38 or described entering after unintended braking state 39, calculate regenerative braking torque request, further regenerative braking torque is distributed to 40.

Calculated after regenerative braking torque request, in step 40, can further distribute regenerative braking torque, its assigning process is referring to Fig. 5.If be judged as in process 32,33,34,35,36 otherwise stop regenerative brake control.

Unintended braking control process as shown in Figure 3.

In described unintended braking state 39, entire car controller 1 judges whether the speed of a motor vehicle is less than or equal to V1 (i.e. step 41 in figure), if the speed of a motor vehicle is less than or equal to V1, by regenerative brake requested torque set 0 42 (request zero moment of torsion); If the speed of a motor vehicle is greater than V1, carry out regenerative brake requested torque and calculate 43, method of calculating is for to table look-up according to the speed of a motor vehicle, and this requested torque is wheel drive shaft moment of torsion; Described V1 is the vehicle speed value that exits regenerative brake of default.

Fig. 5 is that regenerative braking torque distributes schematic diagram.

In described regenerative braking torque distributes 40, entire car controller 1 multiplies each other the regenerative brake requested torque obtaining in unintended braking state 39 and current drive shaft speed, obtain regenerative brake request power A, i.e. regenerative brake request power 49 in figure, to regenerative brake request power, A limits, prevent that excessive charge power from causing damage to battery, its method is for allowing charge power to compare regenerative brake request power A and battery, get smaller as the regenerative brake request power 50 after limiting, thereby obtain regenerative brake request power B; Divided by drive shaft speed, obtain the regenerative braking torque value request TA through restriction, i.e. regenerative braking torque value request 51 with regenerative brake request power B.

In judging 52, judge whether regenerative braking torque value request A has exceeded rear drive motor maximum permissible torque T_tm_max; If no, enter the assignment 56 in figure, by regenerative brake requested torque value A assignment, to rear drive motor shaft end requested torque T_tm, now before driving motor and driving engine do not participate in braking.If judging the judgement in 52 sets up, enter and judge 53, whether the difference that judges regenerative brake requested torque value A and T_tm_max in judging 53 is greater than engine brake torque T_eng_brk and ISG motor maximum permissible torque T_isg_max sum, if judgement is false, carry out assignment 55, rear drive motor shaft end requested torque T_tm is set to T_tm_max, the axle head requested torque of before driving ISG motor is made as: regenerative braking torque value request A-T_tm_max-T_eng_brk simultaneously, if the judgement in judging 53 is set up, enter assignment 54, the requested torque of rear drive motor and forerunner ISG is all set to its maximum permissible torque, namely T_tm=T_tm_max, T_isg=T_isg_max.

Forced brake control process as shown in Figure 4.

In described forced brake state 38, entire car controller 1 judges whether the speed of a motor vehicle is less than or equal to V1 (step 44 in figure), if the speed of a motor vehicle is less than or equal to V1, by regenerative brake requested torque set 0 48; If the speed of a motor vehicle is greater than V1, judge whether to receive the regenerative braking torque request 45 regenerative braking torque request of brake controller 7 (from) of BCU, if so, the requested torque of BCU is set to regenerative brake requested torque 47 (requested torque of self-retention controller 7 is set to regenerative brake requested torque); If do not receive the regenerative braking torque request of self-retention controller 7, to table look-up and try to achieve regenerative brake requested torque 46 by the speed of a motor vehicle, this requested torque is wheel drive shaft moment of torsion; Described V1 is the vehicle speed value that exits regenerative brake of default.

Still as shown in Figure 5:

In described regenerative braking torque distributes 40, entire car controller 1 multiplies each other the regenerative brake requested torque obtaining in forced brake state 38 and current drive shaft speed, obtain regenerative brake request power A, i.e. regenerative brake request power 49 in figure, to regenerative brake request power, A limits, prevent that excessive charge power from causing damage to battery, its method is for allowing charge power to compare regenerative brake request power A and battery, get smaller as the regenerative brake request power 50 after limiting, thereby obtain regenerative brake request power B; Divided by drive shaft speed, obtain the regenerative braking torque value request TA through restriction, i.e. regenerative braking torque value request 51 with regenerative brake request power B.

Then described above, enter the step judging after 52.

By reference to the accompanying drawings the present invention is exemplarily described above; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or without improving, design of the present invention and technical scheme are directly applied to other occasion, all within protection scope of the present invention.

Claims (1)

1. the regenerating brake control method of a plug-in hybrid-power automobile power system, described plug-in hybrid-power automobile is provided with entire car controller (1), CAN bus (21), brake pedal (18), acceleration pedal (19), described power system is provided with the driving engine (13) of before driving and Automatic Transmission (15), before driving motor, and described before driving motor is connected with high-tension battery (8);
Described before driving motor is starting-generating all-in-one (12); Described power system is also provided with rear drive motor (11), and described rear drive motor (11) is connected with described high-tension battery (8);
Described power system is provided with pedal switch (14), and described pedal switch (14) is connected with described entire car controller (1);
Described power system is provided with gear detector (20), and described gear detector (20) is connected with described entire car controller (1);
Described high-tension battery (8) is connected with described CAN bus (21) by battery management system (3);
Described power system is provided with brake controller (7), and described brake controller (7) is connected with described CAN bus (21);
It is characterized in that described regenerating brake control method is:
Entire car controller (1) first detects the gear request (32) of chaufeur, is neutral gear request if current, does not carry out regenerative brake;
If be not neutral gear request current, judgement is when whether vehicle in front is in slip state (33), if when vehicle in front is in slip state, do not carry out regenerative brake;
If current vehicles failed in slip state, judges high-tension battery (8) and whether connects (34), if high-tension battery (8), not in coupled situation, does not carry out regenerative brake;
If current high-tension battery (8) in coupled situation, judges whether system has dependent failure (35), if system does not have dependent failure, do not carry out regenerative brake;
If system does not have dependent failure, judge whether chaufeur has unclamped acceleration pedal (36), if not release the gas pedal (19) of chaufeur does not carry out regenerative brake;
If chaufeur release the gas pedal (19), judges brake pedal status (37), if chaufeur is stepped on brake pedal (19), enter forced brake state (38); If chaufeur is not stepped on brake pedal (19), enter unintended braking state (39);
Entering forced brake state (38) or entering after unintended braking state (39), calculate regenerative braking torque request, further regenerative braking torque is distributed to (40);
In described unintended braking state (39), entire car controller (1) judges whether the speed of a motor vehicle is less than or equal to V1, if the speed of a motor vehicle is less than or equal to V1, by regenerative brake requested torque set zero; If the speed of a motor vehicle is greater than V1, carry out the calculating of regenerative brake requested torque, method of calculating is for to table look-up according to the speed of a motor vehicle, and this requested torque is wheel drive shaft moment of torsion; Described V1 is the vehicle speed value that exits regenerative brake of default;
Distribute in (40) at described regenerative braking torque, entire car controller (1) multiplies each other the regenerative brake requested torque obtaining in unintended braking state (39) and current drive shaft speed, obtain regenerative brake request power A, to regenerative brake request power, A limits, prevent that excessive charge power from causing damage to battery, its method is for allowing charge power to compare regenerative brake request power A and battery, get smaller as the regenerative brake request power after limiting, thereby obtain regenerative brake request power B; Divided by drive shaft speed, obtain the regenerative braking torque value request T through restriction with regenerative brake request power B;
In described forced brake state (38), entire car controller (1) judges whether the speed of a motor vehicle is less than or equal to V1(44), if the speed of a motor vehicle is less than or equal to V1, by regenerative brake requested torque set zero; If the speed of a motor vehicle is greater than V1, judge whether to receive the regenerative braking torque request (45) from brake controller (7), if so, the requested torque of self-retention controller (7) is set to regenerative brake requested torque (47); If do not receive the regenerative braking torque request of self-retention controller (7), to table look-up and try to achieve regenerative brake requested torque (46) by the speed of a motor vehicle, this requested torque is wheel drive shaft moment of torsion; Described V1 is the vehicle speed value that exits regenerative brake of default;
Distribute in (40) at described regenerative braking torque, entire car controller (1) multiplies each other the regenerative brake requested torque obtaining in forced brake state (38) and current drive shaft speed, obtain regenerative brake request power A, to regenerative brake request power, A limits, prevent that excessive charge power from causing damage to battery, its method is for allowing charge power to compare regenerative brake request power A and battery, get smaller as the regenerative brake request power after limiting, thereby obtain regenerative brake request power B; Divided by drive shaft speed, obtain the regenerative braking torque value request TA through restriction with regenerative brake request power B.
CN201110243761.6A 2011-08-24 2011-08-24 Plug-in hybrid electric vehicle power system and regenerative brake control method for same CN102381178B (en)

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