CN109435926A - A kind of braking system of electric car, control method and electric car - Google Patents
A kind of braking system of electric car, control method and electric car Download PDFInfo
- Publication number
- CN109435926A CN109435926A CN201811456615.XA CN201811456615A CN109435926A CN 109435926 A CN109435926 A CN 109435926A CN 201811456615 A CN201811456615 A CN 201811456615A CN 109435926 A CN109435926 A CN 109435926A
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- braking
- gas
- gas outlet
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000000694 effects Effects 0.000 abstract description 12
- 230000005611 electricity Effects 0.000 abstract description 12
- 230000006872 improvement Effects 0.000 description 7
- 230000001172 regenerating effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000009423 ventilation Methods 0.000 description 5
- 238000004064 recycling Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000009885 systemic effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/58—Combined or convertible systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Regulating Braking Force (AREA)
- Braking Systems And Boosters (AREA)
Abstract
The present invention provides a kind of braking system of electric car, control method and electric cars, are related to technical field, including gas receiver, brake pedal, main brake valve, double-way check valve, solenoid valve, relay valve, brake, battery, motor and entire car controller；First air intake of first gas outlet of gas receiver through main brake valve connection double-way check valve, the gas outlet of double-way check valve connects relay valve, to form the first barometric brake circuit；Second gas outlet of gas receiver is connected to the second air intake of double-way check valve through solenoid valve, and the gas outlet of double-way check valve connects relay valve, to form the second barometric brake circuit；The third gas outlet of gas receiver is connected to the air inlet of relay valve；Entire car controller is electrically connected with motor, solenoid valve and battery.By increasing by the second barometric brake circuit on Pneumatic braking system, the protection of battery when not only realizing full electricity, and the braking effect of braking system of electric car is not influenced.
Description
Technical field
The present invention relates to automobile brake technical fields, in particular to a kind of braking system of electric car, control method
And electric car.
Background technique
With the progress of the consumption of the energy, environmental degradation and technology, vehicle intellectualized and motorized is present automobile industry
Development trend.It is vehicle intellectualized to keep running car safer, more comfortable.Electric car has Brake energy recovery function
Can, it can be energy saving.
Currently, the pure electric vehicle integral new-energy passenger in industry, realizes energy regenerating and vehicle deceleration using motor braking system,
And Pneumatic braking system is combined to realize the functions such as vehicle deceleration, parking.Since driver's brake pedal, first by motor braking
Systemic effect, after brake pedal aperture, which is greater than, limits angle, Pneumatic braking system intervention effect.
But under power battery full power state, in order to protect power battery, motor braking system no longer carries out energy regenerating
And vehicle deceleration, only Pneumatic braking system acts on pure electric vehicle system energy car at this time.When driver's brake pedal, pedal is opened
Degree is not up to when limiting angle, and vehicle brakeless, only after brake pedal, which is greater than, limits angle, vehicle just has braking effect.This
When, it will driver's judgement is influenced, brake failure is takeed for, caused to bring to a halt.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of braking system of electric car, control method
And electric car, when under vehicle full power state, can realize that the pedal opening of brake pedal does not reach preset aperture threshold value, just
Gas braking can be carried out, for compensating the electric braking lost, realizes vehicle deceleration.
In a first aspect, the present invention provides a kind of braking system of electric car, comprising:
Gas receiver, brake pedal, main brake valve, double-way check valve, solenoid valve, relay valve, brake, battery, motor with
And entire car controller；Wherein:
First gas outlet of the gas receiver connects the first air intake of the double-way check valve, institute through the main brake valve
The gas outlet for stating double-way check valve connects the relay valve, to form the first barometric brake circuit；
Second gas outlet of the gas receiver is connected to the second air intake of the double-way check valve, institute through the solenoid valve
The gas outlet for stating double-way check valve connects the relay valve, to form the second barometric brake circuit；
The third gas outlet of the gas receiver is connected to the air inlet of the relay valve；
The brake pedal is mechanically connected and is equipped with the main brake valve；
The entire car controller is electrically connected with motor, solenoid valve and battery.
As a further improvement, the gas outlet of the double-way check valve is connected to the relay valve, make institute to provide gas
State the air inlet conducting of relay valve；The gas outlet of the relay valve is connected in the brake chamber of the brake, to fill gas
Body to the brake brake chamber.
As a further improvement, second barometric brake circuit is additionally provided with pressure limiting valve, the pressure limiting valve is set to described
Between second gas outlet and the solenoid valve.
As a further improvement, the brake pedal is equipped with the pedal valve, the pedal of the brake pedal
Aperture controls the conducting of first barometric brake circuit, second barometric brake circuit respectively；The brake pedal is stepped on
Plate aperture controls the motor and provides braking moment, to electric braking and recovers energy.
As a further improvement, the brake pedal is equipped with angular transducer, the angular transducer and the vehicle
Controller electrical connection, to feed back the signal of pedal opening to the entire car controller.
Second aspect, the present invention provides a kind of control methods of braking system of electric car, comprising:
Obtain the pedal opening of current brake pedal；
When the pedal opening is less than preset aperture threshold value, the remaining capacity of present battery is obtained；
When the remaining capacity is greater than preset first power threshold, the second barometric brake circuit of control is connected and controls
Motor stops output electrical system dynamic torque, to carry out gas braking via second barometric brake circuit.
As a further improvement, further include:
When the remaining capacity is less than preset first power threshold and is greater than the second power threshold, judgement it is current whether
To step on the brake pedal for the first time；
When be judged as step on the brake pedal for the first time when, then control the second barometric brake circuit and be connected and control motor and stop
Only output electrical system dynamic torque, to carry out gas braking via second barometric brake circuit；
When be judged as it is non-step on the brake pedal for the first time when, reacquire the remaining capacity of present battery.
As a further improvement, further include:
When the remaining capacity is less than preset second power threshold and is greater than preset third power threshold, control electricity
Machine exports scheduled electric braking torque, and controls the electric braking torque and be reduced to zero within a preset time, and control the second gas
Press brake circuit conducting.
As a further improvement, further include: when the remaining capacity is less than the third power threshold, control motor is defeated
Electric braking torque out.
The third aspect, the present invention provides a kind of electric cars, including the electric car as described in first aspect any one
Braking system.
By using above-mentioned technical proposal, the present invention can obtain following technical effect:
The braking system of electric car and its control method of the application, by increasing by the second air pressure on Pneumatic braking system
Brake circuit realizes vehicle under non-full power state, and the second barometric brake circuit remains turned-off, and brake pedal starts, first
Electric braking effect is realized by motor and is recovered energy, after brake pedal aperture is greater than preset aperture threshold value, opens the first gas
Brake circuit is pressed to realize gas braking intervention effect.For vehicle under full power state, motor stops output electrical system dynamic torque, steps on braking
Pedal starts, and when the pedal opening of brake pedal is less than preset aperture threshold value, the second barometric brake circuit is opened, so that it may be carried out
Gas braking realizes vehicle deceleration for compensating the electric braking lost, after brake pedal aperture is greater than preset aperture threshold value,
It opens the first barometric brake circuit and realizes gas braking action.The protection of battery when not only realizing full electricity, and do not influence electric car
The braking effect of braking system.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of embodiment of the present invention
Attached drawing be briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not to be seen as
It is the restriction to range, it for those of ordinary skill in the art, without creative efforts, can be with root
Other relevant attached drawings are obtained according to these attached drawings.
Fig. 1 is the structural schematic diagram of the braking system of electric car of first embodiment of the invention；
Fig. 2 is the partial enlarged view at the I in Fig. 1；
Fig. 3 is the input-output curve that the pedal opening and electric braking of brake pedal, gas are braked in the prior art；
Fig. 4 is the flow diagram of the control method of the braking system of electric car of second embodiment of the invention；
Fig. 5 is the control flow block diagram of the control method of the braking system of electric car of second embodiment of the invention.
Icon: 1- gas receiver；The first gas outlet 11-；The second gas outlet 12-；13- third gas outlet；2- brake pedal；3-
Main brake valve；4- double-way check valve；The first air intake of 41-；The gas outlet 42-；The second air intake of 43-；5- solenoid valve；6- servo
Valve；61- air inlet；The gas outlet 62-；63- piston valve port；7- brake；8- motor；9- pressure limiting valve.
Specific embodiment
To keep the purposes, technical schemes and advantages of embodiment of the present invention clearer, implement below in conjunction with the present invention
The technical solution in embodiment of the present invention is clearly and completely described in attached drawing in mode, it is clear that described reality
The mode of applying is some embodiments of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ability
Domain those of ordinary skill every other embodiment obtained without creative efforts, belongs to the present invention
The range of protection.Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit below and is wanted
The scope of the present invention of protection is sought, but is merely representative of selected embodiment of the invention.Based on the embodiment in the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts belongs to this
Invent the range of protection.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
First embodiment of the invention:
In conjunction with Fig. 1, a kind of braking system of electric car is present embodiments provided, comprising: gas receiver 1, brake pedal 2, system
Dynamic main valve 3, double-way check valve 4, solenoid valve 5, relay valve 6, brake 7, motor 8, battery (not shown) and entire car controller
(not shown).
Referring to FIG. 2, wherein, arrow direction is ventilation direction, it is 1. the ventilation direction of the first gas outlet 11, is 2. second
3. the ventilation direction of gas outlet 12 is the ventilation direction of third gas outlet 13.In the present embodiment, the first gas outlet of gas receiver 1
11 connect the first air intake 41 of double-way check valve 4 through main brake valve 3, and the gas outlet 42 of double-way check valve 4 connects relay valve 6,
To form the first barometric brake circuit.Second gas outlet 12 of gas receiver 1 is connected to the second of double-way check valve 4 through solenoid valve 5
The gas outlet 42 of air intake 43, double-way check valve 4 connects relay valve 6, to form the second barometric brake circuit.The of gas receiver 1
Three gas outlets 13 are connected to the air inlet 61 of relay valve 6.Brake pedal 2 is mechanically connected and is equipped with main brake valve 3.Vehicle
Controller is electrically connected with motor 8, solenoid valve 8 and battery.It should be noted that the first gas outlet 11 of gas receiver 1,
Two gas outlets 12 and third gas outlet 13 are normally opened gas outlet, to provide gas to the first barometric brake circuit, second
The air inlet 61 of barometric brake circuit and relay valve 6.
More specifically, the gas outlet 42 of double-way check valve is connected to relay valve 6, with provide gas make relay valve 6 into
Port 61 is connected.The gas outlet 62 of relay valve 6 is connected in the brake chamber of brake 7, with the system of filling gas to brake
It takes offence room.In the present embodiment, the gas outlet 42 of double-way check valve 4 is connected to the piston valve port 63 of relay valve 6, piston valve port 63
The gas outlet 62 that relay valve 6 is controlled after ventilation is opened so that the gas of third gas outlet 13 by the gas outlet 62 of relay valve 6 into
Enter into brake chamber, realizes gas braking.The piston valve port that the gas outlet 42 of double-way check valve 4 has gas to be passed through relay valve 6, just
The air inlet 61 of openable relay valve 6, so that the gas of third gas outlet 13 enters the gas outlet 62 of relay valve 6.It is understood that
, the piston valve port 63 of relay valve 6 is ventilated so that the air inlet 61 of relay valve 6 is opened, belongs to the prior art, no longer goes to live in the household of one's in-laws on getting married herein
It states.
Further, the second barometric brake circuit is additionally provided with pressure limiting valve 9.Second barometric brake circuit is equipped with pressure limiting valve 9
For the pressure limit of limit circuit, when circuit pressure is too high or too low, pressure limiting valve 9 can provide a signal, and front end carries out again
Pressure regulation is maintained in a constant range by boosting and being depressured come regulating loop pressure.
Further, the pedal opening control motor 8 of brake pedal 2 provides braking moment, to electric braking and recycling
Energy.In the present embodiment, brake pedal 2 is equipped with angular transducer, and angular transducer and entire car controller are electrically connected, with
The signal of pedal opening is fed back to entire car controller.It is equipped with angular transducer by brake pedal 2, feeds back the letter of pedal opening
Number to entire car controller, control of the entire car controller to motor 3 is realized.
Specifically, brake pedal 2 is equipped with pedal valve 3, and the pedal opening of brake pedal 2 controls the first gas respectively
Press the conducting of brake circuit, the second barometric brake circuit.Brake pedal 2 is mechanically connected and is equipped with main brake valve 3, to
Control the opening and closing of main brake valve 3.Brake pedal 2 is equipped with preset aperture threshold value, presets when the pedal opening of brake pedal 2 is greater than
Aperture threshold value when, main brake valve 3 open so that the second barometric brake circuit be connected.When the pedal opening of brake pedal 2 is less than
When preset aperture threshold value, main brake valve 3 is remained turned-off, so that the first barometric brake circuit is in closed state.At this point, automobile
Braking judged by entire car controller, select gas braking or electric braking to realize to automobile brake.When the battery of automobile is in
When full power state, motor braking system no longer carries out energy regenerating and vehicle deceleration.At this point, the second air pressure of vehicle control unit controls
The solenoid valve 5 of brake circuit is opened, so that the second barometric brake circuit is connected, the gas outlet 42 of double-way check valve is ventilated to servo
The air inlet 61 of valve 6, relay valve 6 is opened, so that the gas of third gas outlet 13 enters system by the gas outlet 62 of relay valve 6
It takes offence in room, realizes gas braking, for compensating the electric braking lost, realize vehicle deceleration.When the battery of automobile is in less than electricity
Under state, solenoid valve 5 is remained turned-off, so that the second barometric brake circuit is in closed state, brake pedal 1 starts, by
Motor 8 realizes electric braking effect and recovers energy.
Referring to Fig. 3, the input and output braked for the pedal opening and electric braking of brake pedal 2 in the prior art, gas
Curve.It is upper from figure it is known that guarantee that vehicle braking energy recycling maximizes, when pedal opening is at 0 °~9 °, vehicle at this time
Only electric braking.After pedal opening is at 9 °, air pressure starts to export, and vehicle is by electric braking and the common work of gas braking at this time
With.But when the battery of automobile is under full power state, in order to protect battery, motor braking system no longer carries out energy regenerating and vehicle
Slow down, only Pneumatic braking system acts on electric car at this time.When driver's brake pedal, pedal opening does not reach restriction angle
When, vehicle brakeless, only after brake pedal, which is greater than, limits angle, vehicle just has braking effect.Influence driver judgement, accidentally with
For brake failure, caused to bring to a halt.
Further, it can be 9 ° that brake pedal 2, which is equipped with preset aperture threshold value,.When the pedal opening for trampling brake pedal 2
Less than 9 °, is connected for the second barometric brake circuit realizes that gas braking either motor 8 realizes electric braking effect and recycling energy at this time
It measures (being determined according to battery status).When the pedal opening for trampling brake pedal 2 is greater than 9 °, the first barometric brake circuit is connected at this time
Realize gas braking.Certainly, it should be noted that in other embodiments of the invention, aperture threshold value may be alternatively provided as other angles
Degree, for example, 8 degree, 10 degree, 11 degree etc..
It is understood that opening and closing of the entire car controller by control solenoid valve 5, realizes the second barometric brake circuit of control
Be turned on and off.When the battery of automobile is in full power state, vehicle control unit controls solenoid valve 5 is opened, so that the second gas
Press brake circuit conducting.When the battery of automobile is in non-full power state, vehicle control unit controls solenoid valve 5 is closed, so that the
Two barometric brake circuits are closed.
Second embodiment of the invention:
It is a kind of control method of braking system of electric car of third embodiment of the invention refering to Fig. 4 to Fig. 5, Fig. 4
Flow diagram.Fig. 5 is the control flow block diagram of the control method of the braking system of electric car of third embodiment of the invention.Electricity
The control method of electrical automobile braking system can be executed by entire car controller, and be specifically included:
S10 obtains the pedal opening of current brake pedal 2.
Wherein, the pedal opening of the brake pedal 2 can be surveyed by the angular transducer being set on the brake pedal 2
It measures, naturally it is also possible to measure by other means, the present invention is not specifically limited.
S20 obtains the remaining capacity of present battery when pedal opening is less than preset aperture threshold value.
In the present embodiment, the aperture threshold value may be configured as 9 °, it is of course also possible to be other angles value, for example, 8 degree,
10 degree, 11 degree etc..
In the present embodiment, the battery may include a battery management system (BMS), and the entire car controller can basis
The battery management system gets the remaining capacity of the battery, it is of course also possible to there is other acquisition modes, the present invention is not done
It is specific to limit.
S30, when remaining capacity is greater than preset first power threshold, the second barometric brake circuit of control is connected and controls
Motor stops output electrical system dynamic torque, to carry out gas braking via second barometric brake circuit.
Specifically, first power threshold may be configured as 98%.When remaining capacity is greater than the first power threshold, explanation
The electricity of battery is fuller at this time, does not need to charge.At this point, vehicle control unit controls solenoid valve 5 is opened so that the second air pressure
Brake circuit conducting, and control motor and stop output electrical system dynamic torque, motor braking system no longer carries out energy regenerating and vehicle
Slow down, the second barometric brake circuit carries out gas braking at this time.When the pedal opening of brake pedal 2 is greater than preset pedal opening,
It opens the first barometric brake circuit and realizes further ground vapour braking action.
S40, when remaining capacity is less than preset first power threshold and is greater than the second power threshold, judgement it is current whether
For brake pedal for the first time.
When being judged as brake pedal 2 for the first time, then controls the second barometric brake circuit and be connected and control motor stopping
Output electrical system dynamic torque, to carry out gas braking via second barometric brake circuit.
When being judged as non-brake pedal 2 for the first time, the remaining capacity of present battery is reacquired.
Specifically, in the present embodiment, second power threshold may be configured as 96%.When remaining capacity is less than the first electricity
When measuring threshold value and being greater than the second power threshold, entire car controller judges whether it is brake pedal 2 for the first time.When being judged as the first time
When brake pedal 2, then controls the second barometric brake circuit and be connected and control control motor stopping output electrical system dynamic torque, electricity
Brake system no longer carries out energy regenerating and vehicle deceleration, and the second barometric brake circuit carries out gas braking at this time.It steps on for the first time
Brake pedal 2, remaining capacity is unaffected, i.e. the remaining capacity without obtaining present battery again.When being judged as non-head
When secondary brake pedal 2, the remaining capacity of present battery need to be reacquired, ensure that the accurate judgement of battery dump energy.
S50, when remaining capacity is less than preset second power threshold and is greater than preset third power threshold, control electricity
Machine exports scheduled electric braking torque, and controls electric braking torque and be reduced to zero within a preset time, and control the second air pressure system
Dynamic circuit conducting.
Specifically, in the present embodiment, the third power threshold may be configured as 95%.When remaining capacity is less than the second electricity
It is the buffer stage of battery dump energy when measuring threshold value and being greater than third power threshold.Motor 8 exports scheduled electric braking at this time
Torque, by vehicle control unit controls motor 8, so that electric braking torque is reduced to zero within a preset time, in electric braking torque
Motor braking system progress energy regenerating for the battery during output to charge, since the comparision of quantity of electricity of battery itself is more, compared with
Close to full power state, therefore i.e. close to full power state after of short duration charging.Hereafter, it is dynamic to stop output electrical system for control electric braking torque
Torque, only the second barometric brake circuit carries out gas braking at this time.
S60, when remaining capacity is less than third power threshold, control motor exports scheduled electric braking torque.
Specifically, when remaining capacity is less than third power threshold 95%, control motor exports scheduled electric braking torque, electricity
Machine 8 realizes electric braking effect and recovers energy as battery charging.Vehicle control unit controls solenoid valve 5 is closed at this time, is made
The second barometric brake circuit is obtained to close.When the pedal opening of brake pedal 2 is greater than preset pedal opening, the second air pressure system is opened
Gas braking intervention is realized in dynamic circuit, realizes that vehicle brakes collective effect by electric braking and gas.
The control method of the braking system of electric car of the application has the recognition capability to different remaining capacities and divides
The other control ability to electric braking, gas braking.
Third embodiment of the invention:
Third embodiment of the invention provides a kind of electric car, including a kind of electric car system as in the first embodiment
Dynamic system.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.
Claims (10)
1. a kind of braking system of electric car characterized by comprising
Gas receiver, brake pedal, main brake valve, double-way check valve, solenoid valve, relay valve, brake, battery, motor and whole
Vehicle controller；Wherein:
First gas outlet of the gas receiver connects the first air intake of the double-way check valve through the main brake valve, described double
The gas outlet of logical check valve connects the relay valve, to form the first barometric brake circuit；
Second gas outlet of the gas receiver is connected to the second air intake of the double-way check valve through the solenoid valve, described double
The gas outlet of logical check valve connects the relay valve, to form the second barometric brake circuit；
The third gas outlet of the gas receiver is connected to the air inlet of the relay valve；
The brake pedal is mechanically connected and is equipped with the main brake valve；
The entire car controller is electrically connected with motor, solenoid valve and battery.
2. braking system of electric car according to claim 1, which is characterized in that the gas outlet of the double-way check valve connects
It is connected to the relay valve, the air inlet of the relay valve is connected to provide gas；The gas outlet of the relay valve is connected to institute
It states in the brake chamber of brake, with filling gas to the brake chamber of the brake.
3. braking system of electric car according to claim 1, which is characterized in that second barometric brake circuit is also set
Limited valve, the pressure limiting valve are set between second gas outlet and the solenoid valve.
4. braking system of electric car according to claim 1, which is characterized in that the brake pedal is passed equipped with angle
Sensor, the angular transducer and the entire car controller are electrically connected, to feed back the signal of pedal opening to the vehicle control
Device processed.
5. braking system of electric car according to claim 4, which is characterized in that the brake pedal and the treadle valve
Door is equipped with, and the pedal opening of the brake pedal controls first barometric brake circuit, the second air pressure system respectively
The conducting in dynamic circuit；The pedal opening of the brake pedal controls the motor and provides braking moment, to electric braking and returns
Receive energy.
6. a kind of control method of the braking system of electric car as described in claim 1-5 any one, which is characterized in that packet
It includes:
Obtain the pedal opening of current brake pedal；
When the pedal opening is less than preset aperture threshold value, the remaining capacity of present battery is obtained；
When the remaining capacity is greater than preset first power threshold, the second barometric brake circuit of control is connected and controls motor
Stop output electrical system dynamic torque, to carry out gas braking via second barometric brake circuit.
7. the control method of braking system of electric car according to claim 6, which is characterized in that further include:
When the remaining capacity is less than preset first power threshold and is greater than the second power threshold, judgement it is current whether headed by
It is secondary to step on the brake pedal；
When be judged as step on the brake pedal for the first time when, then control the second barometric brake circuit be connected and control motor stop it is defeated
Electric braking torque out, to carry out gas braking via second barometric brake circuit；
When be judged as it is non-step on the brake pedal for the first time when, reacquire the remaining capacity of present battery.
8. the control method of braking system of electric car according to claim 7, which is characterized in that further include:
When the remaining capacity is less than preset second power threshold and is greater than preset third power threshold, control motor is defeated
Scheduled electric braking torque out, and control the electric braking torque and be reduced to zero within a preset time, and control the second air pressure system
Dynamic circuit conducting.
9. the control method of braking system of electric car according to claim 8, which is characterized in that further include: when described
When remaining capacity is less than the third power threshold, motor output electrical system dynamic torque is controlled.
10. a kind of electric car, which is characterized in that including the electric vehicle brake system as described in claim 1 to 5 any one
System.
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