CN109435926B - Electric automobile braking system, control method and electric automobile - Google Patents
Electric automobile braking system, control method and electric automobile Download PDFInfo
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- CN109435926B CN109435926B CN201811456615.XA CN201811456615A CN109435926B CN 109435926 B CN109435926 B CN 109435926B CN 201811456615 A CN201811456615 A CN 201811456615A CN 109435926 B CN109435926 B CN 109435926B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000011084 recovery Methods 0.000 claims description 12
- 230000000994 depressogenic effect Effects 0.000 claims description 10
- 230000000694 effects Effects 0.000 abstract description 6
- 230000001276 controlling effect Effects 0.000 description 13
- 230000006872 improvement Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 238000009423 ventilation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
Classifications
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- 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
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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
-
- 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 invention provides an electric automobile braking system, a control method and an electric automobile, and relates to the technical field of air cylinders, brake pedals, a brake master valve, a two-way check valve, an electromagnetic valve, a relay valve, a brake, a battery, a motor and a whole automobile controller; the first air outlet of the air cylinder is connected with the first air inlet of the two-way check valve through the brake master valve, and the air outlet of the two-way check valve is connected with the relay valve to form a first pneumatic brake loop; the second air outlet of the air cylinder is connected to the second air inlet of the two-way check valve through the electromagnetic valve, and the air outlet of the two-way check valve is connected with the relay valve to form a second pneumatic braking loop; the third air outlet of the air cylinder is connected to the air inlet of the relay valve; the whole vehicle controller is electrically connected with the motor, the electromagnetic valve and the battery. By adding the second air brake loop on the air brake system, the protection of the battery during full power is realized, and the braking effect of the electric automobile brake system is not affected.
Description
Technical Field
The invention relates to the technical field of automobile braking, in particular to an electric automobile braking system, a control method and an electric automobile.
Background
With the consumption of energy, environmental deterioration and technical progress, the automobile intellectualization and electrodynamic technology are the current development trend of the automobile industry. The automobile is intelligent, so that the automobile can run more safely and more comfortably. The electric automobile has the braking energy recovery function, and can save energy.
At present, a pure electric new energy bus in the industry adopts a motor braking system to realize energy recovery and vehicle deceleration, and combines a pneumatic braking system to realize functions of vehicle deceleration, parking and the like. The motor braking system is firstly used when a driver presses a brake pedal, and the air braking system is used in an intervention mode when the opening degree of the brake pedal is larger than a limiting angle.
However, in the full-power state of the power battery, the motor braking system does not recover energy and decelerate the vehicle any more in order to protect the power battery, and the pure electric energy bus only acts as a pneumatic braking system. When the driver presses the brake pedal, the pedal opening does not reach the limiting angle, the vehicle is not braked, and only after the brake pedal is larger than the limiting angle, the vehicle has a braking effect. At this time, the judgment of a driver is affected, and the driver is mistakenly caused to brake failure, so that emergency braking is caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an electric automobile braking system, a control method and an electric automobile, which can realize air braking when the pedal opening of a brake pedal does not reach a preset opening threshold value in a full-electric state of the automobile, and can be used for compensating lost electric braking to realize deceleration of the automobile.
In a first aspect, the present invention provides an electric vehicle brake system comprising:
the device comprises an air cylinder, a brake pedal, a brake master valve, a two-way check valve, an electromagnetic valve, a relay valve, a brake, a battery, a motor and a vehicle controller; wherein:
the first air outlet of the air cylinder is connected with the first air inlet of the two-way check valve through the brake master valve, and the air outlet of the two-way check valve is connected with the relay valve to form a first pneumatic brake loop;
the second air outlet of the air cylinder is connected to the second air inlet of the two-way check valve through the electromagnetic valve, and the air outlet of the two-way check valve is connected with the relay valve to form a second air pressure braking loop;
the third air outlet of the air cylinder is connected to the air inlet of the relay valve;
the brake pedal is mechanically connected with the brake master valve and is matched with the brake master valve;
and the whole vehicle controller is electrically connected with the motor, the electromagnetic valve and the battery.
As a further improvement, the air outlet of the two-way check valve is connected to the relay valve to provide air to conduct the air inlet of the relay valve; and an air outlet of the relay valve is communicated with a brake air chamber of the brake so as to fill air into the brake air chamber of the brake.
As a further improvement, the second pneumatic brake circuit is further provided with a pressure limiting valve, and the pressure limiting valve is arranged between the second air outlet and the electromagnetic valve.
As a further improvement, the brake pedal is matched with the pedal valve, and the pedal opening of the brake pedal controls the conduction of the first pneumatic brake loop and the second pneumatic brake loop respectively; the pedal opening of the brake pedal controls the motor to provide braking torque for electric braking and energy recovery.
As a further improvement, the brake pedal is provided with an angle sensor, and the angle sensor is electrically connected with the whole vehicle controller so as to feed back a pedal opening signal to the whole vehicle controller.
In a second aspect, the present invention provides a control method of an electric vehicle brake system, including:
acquiring the pedal opening of a current brake pedal;
when the pedal opening is smaller than a preset opening threshold, acquiring the residual electric quantity of the current battery;
and when the residual electric quantity is larger than a preset first electric quantity threshold value, controlling the second air pressure brake circuit to be conducted and controlling the motor to stop outputting electric brake torque so as to perform air brake through the second air pressure brake circuit.
As a further improvement, further comprising:
when the residual electric quantity is smaller than a preset first electric quantity threshold value and larger than a second electric quantity threshold value, judging whether the brake pedal is first stepped on at present;
when the brake pedal is judged to be depressed for the first time, a second air brake loop is controlled to be conducted, and the motor is controlled to stop outputting electric brake torque so as to perform air brake through the second air brake loop;
and when the brake pedal is judged not to be depressed for the first time, the residual electric quantity of the current battery is obtained again.
As a further improvement, further comprising:
and when the residual electric quantity is smaller than a preset second electric quantity threshold value and larger than a preset third electric quantity threshold value, controlling the motor to output preset electric braking torque, controlling the electric braking torque to be reduced to zero in preset time, and controlling the second air braking loop to be conducted.
As a further improvement, further comprising: and when the residual electric quantity is smaller than the third electric quantity threshold value, controlling the motor to output electric braking torque.
In a third aspect, the present invention provides an electric vehicle comprising an electric vehicle brake system according to any one of the first aspects.
By adopting the technical scheme, the invention can obtain the following technical effects:
according to the electric automobile braking system and the control method thereof, the second air pressure braking loop is added to the air pressure braking system, so that the second air pressure braking loop is kept closed when the automobile is in a state of not being full of electricity, the electric braking action and the energy recovery are realized by the motor at first when the brake pedal is started to be stepped down, and the first air pressure braking loop is started to realize the air braking intervention action after the opening of the brake pedal is larger than the preset opening threshold value. When the motor stops outputting electric braking torque in a full-power state of the vehicle, the motor starts to press the brake pedal, when the pedal opening of the brake pedal is smaller than a preset opening threshold value, the second pneumatic brake loop is started, pneumatic braking can be performed to compensate lost electric braking, vehicle deceleration is achieved, and when the pedal opening of the brake pedal is larger than the preset opening threshold value, the first pneumatic brake loop is started to achieve pneumatic braking. The protection of the battery during full power is realized, and the braking effect of the electric automobile braking system is not influenced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of an electric vehicle brake system according to a first embodiment of the present invention;
FIG. 2 is an enlarged view of a portion at I in FIG. 1;
FIG. 3 is a graph of pedal opening versus electric and pneumatic brake input/output for a brake pedal in the prior art;
fig. 4 is a flowchart of a control method of an electric vehicle brake system according to a second embodiment of the present invention;
fig. 5 is a control flow block diagram of a control method of an electric vehicle brake system according to a second embodiment of the present invention.
Icon: 1-an air cylinder; 11-a first air outlet; 12-a second air outlet; 13-a third air outlet; 2-a brake pedal; 3-a master brake valve; 4-a two-way check valve; 41-a first air inlet; 42-air outlet; 43-a second air inlet; 5-an electromagnetic valve; 6-a relay valve; 61-air inlet; 62-air outlet; 63-piston port; 7-a brake; 8-a motor; 9-pressure limiting valve.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
First embodiment of the present invention:
with reference to fig. 1, this embodiment provides an electric vehicle braking system, including: the brake system comprises an air cylinder 1, a brake pedal 2, a brake master valve 3, a two-way check valve 4, an electromagnetic valve 5, a relay valve 6, a brake 7, a motor 8, a battery (not shown) and a vehicle controller (not shown).
Referring to fig. 2, the arrow direction is the ventilation direction, (1) the ventilation direction of the first air outlet 11, (2) the ventilation direction of the second air outlet 12, and (3) the ventilation direction of the third air outlet 13. In this embodiment, the first air outlet 11 of the air cylinder 1 is connected to the first air inlet 41 of the two-way check valve 4 via the brake master valve 3, and the air outlet 42 of the two-way check valve 4 is connected to the relay valve 6 to form a first pneumatic brake circuit. The second air outlet 12 of the air reservoir 1 is connected to the second air inlet 43 of the two-way check valve 4 via the solenoid valve 5, and the air outlet 42 of the two-way check valve 4 is connected to the relay valve 6 to form a second pneumatic brake circuit. The third air outlet 13 of the air reservoir 1 is connected to the air inlet 61 of the relay valve 6. The brake pedal 2 is mechanically connected with the brake master valve 3 and is matched with the brake master valve. The whole vehicle controller is electrically connected with the motor 8, the electromagnetic valve 8 and the battery. It should be noted that the first air outlet 11, the second air outlet 12, and the third air outlet 13 of the air cylinder 1 are all normally open air outlets for providing air to the first air pressure brake circuit, the second air pressure brake circuit, and the air inlet 61 of the relay valve 6.
More specifically, the outlet port 42 of the two-way check valve is connected to the relay valve 6 to provide gas to turn on the inlet port 61 of the relay valve 6. The air outlet 62 of the relay valve 6 communicates into the brake chamber of the brake 7 to fill the brake chamber with air. In this embodiment, the air outlet 42 of the two-way check valve 4 is connected to the piston valve port 63 of the relay valve 6, and the air outlet 62 of the relay valve 6 is controlled to be opened after the piston valve port 63 is ventilated, so that the air at the third air outlet 13 enters the brake air chamber through the air outlet 62 of the relay valve 6, and air braking is achieved. The gas outlet 42 of the two-way check valve 4 is provided with a piston valve port for introducing gas into the relay valve 6, so that the gas inlet 61 of the relay valve 6 can be opened, and the gas at the third gas outlet 13 enters the gas outlet 62 of the relay valve 6. It will be appreciated that the piston port 63 of the relay valve 6 is vented to open the inlet port 61 of the relay valve 6, as is known in the art and will not be described in detail herein.
Further, the second pneumatic brake circuit is also provided with a pressure limiting valve 9. The second pneumatic brake circuit is provided with a pressure limiting valve 9 for limiting the pressure range of the circuit, when the pressure of the circuit is too high or too low, the pressure limiting valve 9 gives a signal, the front end is regulated, and the pressure of the circuit is regulated to be in a constant range through pressure increasing and pressure reducing.
Further, the pedal opening control motor 8 of the brake pedal 2 provides a braking torque for electric braking and energy recovery. In this embodiment, an angle sensor is disposed on the brake pedal 2, and the angle sensor is electrically connected to the vehicle controller to feed back a signal of the pedal opening to the vehicle controller. The angle sensor is arranged on the brake pedal 2, and signals of the pedal opening degree are fed back to the whole vehicle controller, so that the whole vehicle controller can control the motor 3.
Specifically, the brake pedal 2 is cooperatively arranged with the pedal valve 3, and the pedal opening of the brake pedal 2 controls the conduction of the first pneumatic brake circuit and the second pneumatic brake circuit respectively. The brake pedal 2 is mechanically connected with the brake master valve 3 and is matched with the brake master valve 3 to control the opening and closing of the brake master valve 3. The brake pedal 2 is provided with a preset opening threshold, and when the pedal opening of the brake pedal 2 is greater than the preset opening threshold, the brake master valve 3 is opened to conduct the second pneumatic brake circuit. When the pedal opening of the brake pedal 2 is smaller than the preset opening threshold, the brake master valve 3 is kept closed, so that the first pneumatic circuit is in a closed state. At this time, the braking of the automobile is judged by the whole automobile controller, and air braking or electric braking is selected to realize the braking of the automobile. When the battery of the automobile is in a full-power state, the motor braking system does not conduct energy recovery and vehicle deceleration. At this time, the vehicle controller controls the electromagnetic valve 5 of the second air brake loop to be opened, so that the second air brake loop is conducted, the air outlet 42 of the two-way check valve is ventilated to the relay valve 6, the air inlet 61 of the relay valve 6 is opened, so that the air of the third air outlet 13 enters the brake air chamber through the air outlet 62 of the relay valve 6, the air brake is realized, the lost electric brake is compensated, and the vehicle deceleration is realized. When the battery of the automobile is in a state of not being full, the electromagnetic valve 5 is kept closed, so that the second air pressure braking circuit is in a closed state, the brake pedal 1 is pressed down to start, and the electric braking action and the energy recovery are realized by the motor 8.
Referring to fig. 3, the pedal opening of the brake pedal 2 in the prior art is shown as an input/output curve for electric braking and pneumatic braking. It can be seen from the figure that, in order to ensure maximum vehicle braking energy recovery, the vehicle is only braked electrically when the pedal opening is between 0 ° and 9 °. When the pedal opening is 9 deg., the air pressure starts to be output, and the electric brake and the air brake act together. However, when the battery of the automobile is in a full-charge state, the motor braking system does not perform energy recovery and vehicle deceleration any more in order to protect the battery, and at the moment, the electric automobile only acts on the air braking system. When the driver presses the brake pedal, the vehicle is not braked when the pedal opening does not reach the limiting angle, and the vehicle has a braking effect only after the brake pedal is larger than the limiting angle. The judgment of a driver is affected, the driver is mistakenly judged to be in braking failure, and the emergency braking is caused.
Further, the brake pedal 2 is provided with a preset opening threshold value, which may be 9 °. When the pedal opening of the brake pedal 2 is smaller than 9 °, air braking is realized for the second air brake circuit conduction or electric braking effect is realized for the motor 8 and energy is recovered (determined according to the battery state). When the pedal opening of the brake pedal 2 is larger than 9 degrees, the first pneumatic circuit is conducted to realize pneumatic braking. Of course, it should be noted that, in other embodiments of the present invention, the opening threshold may be set at other angles, for example, 8 degrees, 10 degrees, 11 degrees, and so on.
It can be understood that the whole vehicle controller controls the on and off of the second pneumatic brake loop by controlling the opening and closing of the electromagnetic valve 5. When the battery of the automobile is in a full-power state, the whole automobile controller controls the electromagnetic valve 5 to be opened, so that the second air brake loop is conducted. When the battery of the automobile is in a non-full state, the whole automobile controller controls the electromagnetic valve 5 to be closed, so that the second air brake loop is closed.
Second embodiment of the present invention:
referring to fig. 4 to 5, fig. 4 is a flowchart illustrating a control method of an electric vehicle brake system according to a third embodiment of the present invention. Fig. 5 is a control flow block diagram of a control method of an electric vehicle brake system according to a third embodiment of the present invention. The control method of the electric automobile braking system can be executed by a whole automobile controller and specifically comprises the following steps:
and S10, acquiring the pedal opening of the current brake pedal 2.
The pedal opening of the brake pedal 2 may be measured by an angle sensor disposed on the brake pedal 2, or may be measured by other means, which is not particularly limited in the present invention.
And S20, when the pedal opening is smaller than a preset opening threshold, acquiring the residual electric quantity of the current battery.
In this embodiment, the opening threshold may be set to 9 °, and of course, other angle values may be used, for example, 8 degrees, 10 degrees, 11 degrees, and so on.
In this embodiment, the battery may include a Battery Management System (BMS), and the vehicle controller may obtain the remaining power of the battery according to the battery management system, however, other obtaining manners are also possible, and the invention is not limited specifically.
And S30, when the residual electric quantity is larger than a preset first electric quantity threshold value, controlling the second air pressure brake circuit to be conducted and controlling the motor to stop outputting electric brake torque so as to perform air brake through the second air pressure brake circuit.
Specifically, the first power threshold may be set to 98%. When the residual electric quantity is larger than the first electric quantity threshold value, the electric quantity of the battery is full at the moment, and charging is not needed. At this time, the vehicle controller controls the electromagnetic valve 5 to be opened so that the second air pressure braking loop is conducted, and controls the motor to stop outputting electric braking torque, the motor braking system does not recover energy and decelerate the vehicle, and at this time, the second air pressure braking loop performs air braking. When the pedal opening of the brake pedal 2 is larger than the preset pedal opening, the first pneumatic braking circuit is started to realize further pneumatic braking.
And S40, judging whether the brake pedal is first stepped on or not currently when the residual electric quantity is smaller than a preset first electric quantity threshold value and larger than a second electric quantity threshold value.
When the brake pedal 2 is judged to be depressed for the first time, the second pneumatic brake circuit is controlled to be conducted and the motor is controlled to stop outputting the electric brake torque so as to perform pneumatic braking through the second pneumatic brake circuit.
When it is determined that the brake pedal 2 is not depressed for the first time, the remaining capacity of the current battery is reacquired.
Specifically, in the present embodiment, the second power threshold may be set to 96%. When the residual electric quantity is smaller than the first electric quantity threshold value and larger than the second electric quantity threshold value, the whole vehicle controller judges whether the brake pedal 2 is depressed for the first time. When the brake pedal 2 is judged to be depressed for the first time, the second air pressure brake circuit is controlled to be conducted, the motor is controlled to stop outputting electric brake torque, the motor brake system is not used for energy recovery and vehicle deceleration, and at the moment, the second air pressure brake circuit is used for air braking. The brake pedal 2 is depressed for the first time, and the residual capacity is not affected, i.e. the residual capacity of the current battery is not required to be acquired again. When the brake pedal 2 is judged to be not depressed for the first time, the residual electric quantity of the current battery is required to be obtained again, and the accurate judgment of the residual electric quantity of the battery is ensured.
And S50, when the residual electric quantity is smaller than a preset second electric quantity threshold value and larger than a preset third electric quantity threshold value, controlling the motor to output preset electric braking torque, controlling the electric braking torque to be reduced to zero in preset time, and controlling the second air braking loop to be conducted.
Specifically, in the present embodiment, the third electric quantity threshold may be set to 95%. And when the residual electric quantity is smaller than the second electric quantity threshold value and larger than the third electric quantity threshold value, the buffer stage of the residual electric quantity of the battery is provided. At this time, the motor 8 outputs a predetermined electric braking torque, and the motor 8 is controlled by the vehicle controller so that the electric braking torque is reduced to zero within a preset time, and the electric braking system performs energy recovery to charge the battery during the output of the electric braking torque. Thereafter, the electric brake torque is controlled to stop outputting the electric brake torque, at which time only the second pneumatic brake circuit performs pneumatic braking.
And S60, controlling the motor to output a preset electric braking torque when the residual electric quantity is smaller than a third electric quantity threshold value.
Specifically, when the remaining capacity is less than 95% of the third capacity threshold, the motor is controlled to output a predetermined electric braking torque, and the motor 8 performs an electric braking action and recovers energy to charge the battery. At this time, the whole vehicle controller controls the electromagnetic valve 5 to be closed, so that the second air brake loop is closed. When the pedal opening of the brake pedal 2 is larger than the preset pedal opening, the second pneumatic brake loop is started to realize pneumatic braking intervention, so that the combined action of electric braking and pneumatic braking of the vehicle is realized.
The control method of the electric automobile braking system has the identification capability for different residual electric quantity and the control capability for electric braking and air braking respectively.
Third embodiment of the invention:
a third embodiment of the present invention provides an electric vehicle, including an electric vehicle brake system as described in the first embodiment.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention.
Claims (4)
1. An electric vehicle braking system, comprising:
the device comprises an air cylinder, a brake pedal, a brake master valve, a two-way check valve, an electromagnetic valve, a relay valve, a brake, a battery, a motor and a vehicle controller; wherein:
the first air outlet of the air cylinder is connected with the first air inlet of the two-way check valve through the brake master valve, and the air outlet of the two-way check valve is connected with the relay valve to form a first pneumatic brake loop;
the second air outlet of the air cylinder is connected to the second air inlet of the two-way check valve through the electromagnetic valve, and the air outlet of the two-way check valve is connected with the relay valve to form a second air pressure braking loop;
the third air outlet of the air cylinder is connected to the air inlet of the relay valve;
the brake pedal is mechanically connected with the brake master valve and is matched with the brake master valve;
the whole vehicle controller is electrically connected with the motor, the electromagnetic valve and the battery; wherein,
the air outlet of the two-way check valve is connected to the relay valve so as to provide gas to conduct the air inlet of the relay valve; the air outlet of the relay valve is communicated with the brake air chamber of the brake so as to fill air into the brake air chamber of the brake;
the brake pedal is matched with the pedal valve, and the pedal opening of the brake pedal controls the conduction of the first pneumatic brake loop and the second pneumatic brake loop respectively; the pedal opening of the brake pedal controls the motor to provide braking torque for electric braking and energy recovery;
the control method of the electric automobile braking system comprises the following steps:
acquiring the pedal opening of a current brake pedal;
when the pedal opening is smaller than a preset opening threshold, acquiring the residual electric quantity of the current battery;
when the residual electric quantity is larger than a preset first electric quantity threshold value, controlling a second air pressure braking loop to be conducted and controlling a motor to stop outputting electric braking torque so as to perform air braking through the second air pressure braking loop;
the method comprises the steps of,
when the residual electric quantity is smaller than a preset first electric quantity threshold value and larger than a second electric quantity threshold value, judging whether the brake pedal is first stepped on at present;
when the brake pedal is judged to be depressed for the first time, a second air brake loop is controlled to be conducted, and the motor is controlled to stop outputting electric brake torque so as to perform air brake through the second air brake loop;
when the brake pedal is judged to be not depressed for the first time, the residual electric quantity of the current battery is obtained again;
the method comprises the steps of,
when the residual electric quantity is smaller than a preset second electric quantity threshold value and larger than a preset third electric quantity threshold value, controlling the motor to output preset electric braking torque, controlling the electric braking torque to be reduced to zero in preset time, and controlling the second air braking loop to be conducted;
the method comprises the steps of,
and when the residual electric quantity is smaller than the third electric quantity threshold value, controlling the motor to output electric braking torque.
2. The electric vehicle braking system of claim 1, wherein the second pneumatic brake circuit is further provided with a pressure limiting valve disposed between the second air outlet and the solenoid valve.
3. The electric vehicle brake system according to claim 1, wherein an angle sensor is provided on the brake pedal, and the angle sensor is electrically connected to the vehicle controller to feed back a signal of a pedal opening to the vehicle controller.
4. An electric vehicle comprising an electric vehicle brake system according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811456615.XA CN109435926B (en) | 2018-11-30 | 2018-11-30 | Electric automobile braking system, control method and electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811456615.XA CN109435926B (en) | 2018-11-30 | 2018-11-30 | Electric automobile braking system, control method and electric automobile |
Publications (2)
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| CN112277657B (en) * | 2019-07-23 | 2022-10-11 | 中车时代电动汽车股份有限公司 | Energy-saving control method and device for electric automobile |
| CN110920406A (en) * | 2019-11-20 | 2020-03-27 | 台州学院 | Energy recovery's autopilot vehicle can carry out |
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