CN111591270A - Double-channel air pressure adjusting device for electric control braking system and control method thereof - Google Patents
Double-channel air pressure adjusting device for electric control braking system and control method thereof Download PDFInfo
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- CN111591270A CN111591270A CN202010529963.6A CN202010529963A CN111591270A CN 111591270 A CN111591270 A CN 111591270A CN 202010529963 A CN202010529963 A CN 202010529963A CN 111591270 A CN111591270 A CN 111591270A
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- regulating circuit
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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
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
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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
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/683—Electrical control in fluid-pressure brake systems by electrically-controlled valves in pneumatic systems or parts thereof
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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
- B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
- B60T15/02—Application and release valves
- B60T15/04—Driver's valves
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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
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The double-channel air pressure adjusting device for the electric control brake system and the control method thereof comprise two pressure adjusting loops and a common electric control unit thereof, wherein the pressure adjusting loops can be independently adjusted through the electric control unit; the first pressure regulating circuit has its own first exhaust path, the second pressure regulating circuit has its own exhaust path; the first and second pressure regulation circuits have a common redundant control pressure path; the redundant control pressure path adjusts the electromagnetic valves and the control valves on the first pressure adjusting circuit and the second pressure adjusting circuit; integrating two pressure regulation circuits into one module, sharing a redundant control pressure path, and arranging respective redundant control valves on the two pressure regulation circuits; under the condition that an electronic brake system fails, wheel brakes on an axle can be braked or released under the condition that electronic regulation is abandoned through a redundant control pressure path.
Description
Technical Field
The invention belongs to the technical field of vehicle braking, and particularly relates to a dual-channel air pressure adjusting device for an electric control braking system and a control method thereof.
Background
The electronic control brake system realizes accurate calculation of the vehicle, sends an output signal of the brake signal generator to the controller, and sends a brake instruction to the brake device by the controller so as to realize stable braking of the vehicle. Against this background, publication No. CN106458196A entitled brake pressure modulator for an electronic brake system of a commercial vehicle discloses a pressure regulating circuit in which two independent pressure regulating circuits are integrated together with a common electronic control module in a common structural unit for the purpose of cost reduction and integration structure, but only one set of redundant control paths is provided in the pressure regulating circuit, and the other pressure regulating circuit cannot perform smooth and reliable braking in the event of electrical control failure.
The electronic brake system realizes accurate metering and quick braking of the vehicle. In this case, the output signal of the brake generator is sent to the ECU, which is dependent on the driver's intention to decelerate or accelerate. The brake generator output signal may be sent by the ECU to a travel safety system such as an anti-lock braking system, an acceleration anti-sideslip control device, a brake pad wear sensor, a brake pad temperature sensor, a body stability system, etc. The control signal is led to a control method of the double-channel air pressure adjusting device, and the control solenoid valve controls the pressure medium to be conveyed to the wheel brake. In the event of a failure of the electronic control unit (e.g. a power interruption, failure due to a failure of the solenoid valve), the pneumatic control device has a complete, independent mechanical braking device, so that the vehicle can be reliably stopped by conventional mechanical braking even in the event of a failure of the electronic control unit.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the dual-channel air pressure adjusting device for the electric control brake system and the control method thereof, and the dual-channel air pressure adjusting device has the characteristics of simple and compact structure, low cost, and convenient and reliable control method.
In order to achieve the purpose, the invention adopts the technical scheme that: the double-channel air pressure adjusting device for the electric control brake system comprises two pressure adjusting loops, namely a first pressure adjusting loop and a second pressure adjusting loop; the first pressure regulating circuit and the second pressure regulating circuit can be independently regulated through the electric control unit respectively; the first pressure regulating circuit has its own first exhaust path, and the second pressure regulating circuit has its own second exhaust path; the first and second pressure regulation circuits have a common redundant control pressure path; the redundant control pressure path is respectively connected with a first pressure increasing electromagnetic valve, a first pressure reducing electromagnetic valve and a first redundant control valve on the first pressure regulating circuit, and a second pressure increasing electromagnetic valve, a second pressure reducing electromagnetic valve and a second redundant control valve on the second pressure regulating circuit; the redundant control pressure path adjusts a first pressure increasing electromagnetic valve, a second pressure increasing electromagnetic valve, a first pressure reducing electromagnetic valve, a second pressure reducing electromagnetic valve, a first redundant control valve and a second redundant control valve on the first pressure adjusting circuit and the second pressure adjusting circuit.
The electric control unit is also connected with the first plugging position, the second plugging position and the third plugging position.
The control method for the dual-channel air pressure adjusting device of the electric control brake system comprises the following steps:
the method comprises the steps that firstly, a left front wheel brake, a right front wheel brake, a left rear wheel brake and a right rear wheel brake which can be operated pneumatically are respectively arranged on a left front wheel, a right front wheel, a left rear wheel and a right rear wheel which are braked; the double-channel pressure regulating device is provided with two pressure regulating loops which are a first pressure regulating loop and a second pressure regulating loop respectively, wherein the first pressure regulating loop is connected with a first compressed air storage cylinder, and the second pressure regulating loop is connected with a second compressed air storage cylinder; the redundant control pressure path is connected with a first brake port or a second brake port of the foot brake valve, and the first pressure regulating circuit and the second pressure regulating circuit can be independently regulated through the electric control unit; the first pressure regulating circuit is provided with a first exhaust path per se, the second pressure regulating circuit is provided with a second exhaust path per se, and the first pressure regulating circuit and the second pressure regulating circuit are provided with a common redundant control pressure path and are used for regulating a first pressure increasing electromagnetic valve, a second pressure increasing electromagnetic valve, a first pressure reducing electromagnetic valve, a second pressure reducing electromagnetic valve, a first redundant control valve and a second redundant control valve on the first pressure regulating circuit and the second pressure regulating circuit;
distributing the pressure with the redundant control pressure path to a first pressure regulating circuit through a first redundant control valve, distributing the pressure to a second pressure regulating circuit through a second redundant control valve, and regulating the pressure;
step three, the first pressure regulating loop is provided with three solenoid valves for controlling flow paths, namely a first pressure increasing solenoid valve, a first pressure reducing solenoid valve and a first redundancy control valve, wherein the first pressure regulating circuit has a regulating air inflow, a first relay valve is operated pneumatically, wherein the first pressure-increasing solenoid valve is in a closed state without current, connected on the input side to a first compressed air reservoir and on the output side to a first relay valve, wherein the first pressure reducing solenoid valve is in a closed state without current, is connected to the output side of the first pressure increasing solenoid valve at the input side, and is connected to the first exhaust path at the output side, wherein the first redundant control valve is connected on the input side to the first brake port of the foot brake valve and on the output side to the first relay valve, the first relay valve is connected with a first working pressure joint at the output side of the first compressed air storage cylinder and a first exhaust path;
the second pressure regulating loop is provided with three electromagnetic valves for controlling flow paths, namely a second pressure increasing electromagnetic valve, a second pressure reducing electromagnetic valve and a second redundant control valve; the second pressure regulating loop regulates and controls air inflow and pneumatically operates a second relay valve; the second pressure solenoid valve is in a closed state without current, is connected to the second compressed air reservoir on the input side and is connected to the second relay valve on the output side; the second pressure reducing solenoid valve is in a closed state under the condition of no current, is connected with the output side of the second pressure increasing solenoid valve on the input side, and is connected with the second exhaust path on the output side; the second redundant control valve is connected on the input side to the first brake port of the foot brake valve and on the output side to a second relay valve, wherein the second relay valve is connected to a second working pressure connection on the output side of the second compressed air reservoir and to a second exhaust gas path;
fourthly, the first pressure regulating circuit and the second pressure regulating circuit distribute air pressure for a left front wheel brake, a right front wheel brake, a left rear wheel brake and a right rear wheel brake; under the condition of normal running, acceleration or deceleration related running safety, including the condition of activating an anti-lock system, an acceleration anti-sideslip control device or an electronic stability adjusting device, the brake pressure on the left front wheel brake, the right front wheel brake, the left rear wheel brake and the right rear wheel brake can be independently adjusted according to requirements;
step five, under the condition of circuit failure, a first brake port of the foot brake valve sends out brake air pressure, and the brake air pressure enters a first pressure regulating circuit and a second pressure regulating circuit and is a left front wheel brake and a right front wheel brake; the second brake port sends out brake air pressure, the brake air pressure enters the first pressure regulating circuit and the second pressure regulating circuit, and the left rear wheel brake and the right rear wheel brake distribute the air pressure.
Compared with the prior art, the invention has the beneficial effects that:
in the control method for the dual-channel air pressure regulating device of the electric control brake system, two independent pressure regulating circuits and a common electric control unit can be integrated into a structural unit together, so that the cost is reduced.
The control method has two pressure control circuits, wherein each pressure control circuit is connected to a corresponding air reservoir, the two pressure control circuits share a redundant pressure control path and a common electronic control unit, and the pressure control circuits can be controlled independently of one another by the electronic control unit. In the event of a failure of the electronic control unit (for example, a power interruption, a failure due to a failure of the solenoid valve), the vehicle can also be reliably stopped by conventional mechanical braking.
Each pressure regulating circuit has its own exhaust path, redundant control pressure path, pneumatic pressure regulating solenoid valve.
The control method for the dual-channel air pressure adjusting device of the electric control brake system has the advantages of simple and compact structure, low cost and production with a small number of simple structure components. Two pressure regulation circuits are integrated into one module, sharing a redundant control pressure path. Thus, respective redundant control valves are arranged on the two pressure regulating circuits.
In the event of a failure of the electric brake system, the wheel brakes on the axle can be braked or deactivated by the redundant control pressure paths without electronic regulation being carried out. This results in a simple, cost-effective and reliable brake system.
In this control method, the first pressure regulating circuit of the redundant control pressure path may be assigned to the left brake circuit, and the second pressure regulating circuit of the redundant control pressure path may be assigned to the right brake circuit.
Drawings
Fig. 1 is a brake system path diagram of a control method for a dual-channel air pressure adjusting device of an electronically controlled brake system according to a preferred embodiment of the present invention.
FIG. 2 is the FIG. 1 embodiment of a dual-circuit axle brake modulator of the present invention with a first pressure regulating circuit for the left wheel and a second pressure regulating circuit for the right wheel.
In the figure: 1-single channel air pressure regulating device; 2-double-channel air pressure adjusting device; 3-an electronic control unit; 4-a first braking port; 5-a second brake port; 6-left front wheel; 7-the right front wheel; 8-left rear wheel; 9-the right rear wheel; 10-left front wheel brake; 11-right front wheel brake; 12-left rear wheel brake; 13-right rear wheel brake; 14-foot brake valve; 15-a first brake interface; 16-a second brake interface; 17-wheel speed, wear sensor one; 18-wheel speed, wear sensor two; 19-wheel speed, wear sensor three; 20-wheel speed, wear sensor four; 21-a first compressed air reservoir; 22-a second compressed air reservoir; 23-a first boost solenoid valve; 24-a second boost solenoid valve; 25-a first pressure reducing solenoid valve; 26-a second pressure reducing solenoid valve; 27-a first redundant control valve; 28-a second redundant control valve; 29-a first pressure sensor; 30-a second pressure sensor; 31 — a first exhaust path; 32-a second exhaust path; 33-a first relay valve; 34-a second relay valve; 35-redundant control pressure path; 36-a first working pressure joint; 37-a second working pressure joint; 38-a first pressure regulation circuit; 39-a second pressure regulation circuit; 40-a third compressed air reservoir; 41-trailer brake; 42-electrically controlled coupling for trailer; 43-a central processing unit; 44-ABS solenoid valve a; 45-ABS electromagnetic valve b; 46-a first muffler; 47-a second muffler; 48-first plugging location; 49-second plugging location; 50-third plugging location.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The double-channel air pressure adjusting device for the electric control brake system comprises two pressure adjusting loops, namely a first pressure adjusting loop 38 and a second pressure adjusting loop 39; the first pressure regulating circuit 38 and the second pressure regulating circuit 39 can be independently regulated by the electronic control unit 3; the first pressure regulating circuit 38 has its own first exhaust path 31, and the second pressure regulating circuit 39 has its own second exhaust path 32; the first and second pressure regulating circuits 38, 39 have a common redundant control pressure path 35; the redundant control pressure path 35 is connected to the first pressure-increasing solenoid valve 23, the first pressure-reducing solenoid valve 25, the first redundant control valve 27 on the first pressure-regulating circuit 38, and the second pressure-increasing solenoid valve 24, the second pressure-reducing solenoid valve 26, the second redundant control valve 28 on the second pressure-regulating circuit 39, respectively; the redundant control pressure path 35 regulates the first pressure-increasing solenoid valve 23, the second pressure-increasing solenoid valve 24, the first pressure-reducing solenoid valve 25, the second pressure-reducing solenoid valve 26, the first redundant control valve 27, and the second redundant control valve 28 on the first pressure-regulating circuit 38 and the second pressure-regulating circuit 39.
The electronic control unit 3 is also connected to a first plug-in position 48, a first plug-in position 49 and a third plug-in position 50.
The invention is based on the recognition that: in the control method for the dual-channel air pressure regulating device of the electric control brake system, two independent pressure regulating circuits and a common electric control unit can be integrated into a structural unit together, so that the cost is reduced.
The invention thus has two pressure control circuits, wherein each pressure control circuit is connected to a respective air reservoir, the two pressure control circuits share a redundant pressure control path, a common electronic control unit, and the pressure control circuits can be controlled independently of one another by the electronic control unit. In the event of a failure of the electronic control unit (for example, a power interruption, a failure due to a failure of the solenoid valve), the vehicle can also be reliably stopped by conventional mechanical braking.
In order to solve the problem, the invention proposes that each pressure regulating circuit has its own exhaust path, redundant control pressure path, pneumatic pressure regulating solenoid valve.
An electronically controlled valve device is understood to mean a pressure regulation of the vehicle brake system by means of a solenoid valve of the device. The redundant control pressure path is used for implementing pressure regulation of the vehicle brake system through a redundant pneumatic flow path. The braking function of the vehicle is ensured by the redundant control in the event of an electrical failure of the braking system.
The invention has simple and compact structure, low cost and production with a small number of simple structure components. The present invention integrates two pressure regulation circuits into one module, sharing a redundant control pressure path. Thus, respective redundant control valves are arranged on the two pressure regulating circuits.
In the event of a failure of the electric brake system, the wheel brakes on the axle can be braked or deactivated by the redundant control pressure paths without electronic regulation being carried out. This results in a simple, cost-effective and reliable brake system.
In this control method, the first pressure regulating circuit of the redundant control pressure path may be assigned to the left brake circuit, and the second pressure regulating circuit of the redundant control pressure path may be assigned to the right brake circuit.
The control method for the dual-channel air pressure adjusting device of the electric control brake system can be realized by the following steps: two pressure regulating circuits are arranged in the control method,
the first pressure regulating circuit has three solenoid valves for controlling the flow paths, one pressure increasing solenoid valve, one pressure reducing solenoid valve and one redundant control valve, wherein the first pressure control circuit has a controllable inlet air quantity, a first relay valve is pneumatically actuated, wherein the first pressure booster solenoid valve is closed in the absence of current, is connected on the input side to the air reservoir and on the output side to the first relay valve, wherein the first pressure reducing solenoid valve is in a closed state without current, is connected to the output side of the first pressure increasing solenoid valve at the input side, and is connected to the first exhaust path at the output side, wherein the first redundant control valve is connected on the input side to the first brake port of the foot brake valve and on the output side to the first relay valve, the first relay valve is connected with a first working pressure joint at the output side of the air cylinder and a first exhaust path;
wherein the second pressure regulating circuit is provided with three solenoid valves of control flow paths, namely a second pressure increasing solenoid valve, a second pressure reducing solenoid valve and a second redundant control valve, wherein the second pressure control circuit has a controllable inlet air quantity, a pneumatically actuated second relay valve, wherein the second pressure booster solenoid valve is closed in the absence of current, is connected on the input side to the air reservoir and on the output side to the second relay valve, wherein the second pressure reducing solenoid valve is in a closed state without current, is connected on the input side to the output side of the second pressure increasing solenoid valve, and is connected on the output side to the second exhaust path, wherein the second redundant control valve is connected on the input side to the first brake port of the foot brake valve and on the output side to the second relay valve, the second relay valve is connected with a second working pressure joint at the output side of the air storage cylinder and a second exhaust path;
the driver therefore initiates a deceleration request of the vehicle by actuating the brake pedal, and the electrical signal detected by the foot brake in this connection is fed to the control unit of the dual-channel pneumatic control device, which generates the brake pressure for each wheel on the basis of this signal and, in the event of a retraction of the brake pedal, reduces the brake pressure via the corresponding exhaust path. The brake generator is pneumatically connected to the air reservoir to provide redundant control pressure to the redundant control pressure path at all times. In the event of an electrical failure of the controller, the brake circuit of the redundant control pressure path further supplies compressed air via the redundant control pressure path and operates accordingly.
The individual regulation of the brake pressure is coordinated with wheel-related pressure regulation circuits, such as anti-lock braking systems, anti-roll-off acceleration control devices, brake pad wear sensors, brake pad temperature sensors, body stabilization systems, etc. In the case of an electronic ride stability control, the brake pressure of the wheel control circuits involved can be varied individually as required. The control electronics perform wheel data acquisition.
The electronic control unit for the pressure control circuit according to the invention can detect and process further data read in by the electronic control unit on the vehicle data bus, such as wheel speeds, brake lining thickness, steering angle information and engine operating information, and can take these into account in the electronic brake control.
The control method for the dual-channel air pressure adjusting device of the electric control brake system comprises the following steps:
the method comprises the steps that firstly, a left front wheel brake 10, a right front wheel brake 11, a left rear wheel brake 12 and a right rear wheel brake 13 which can be operated pneumatically are respectively arranged on a left front wheel 6, a right front wheel 7, a left rear wheel 8 and a right rear wheel 9 which are braked; the double-channel air pressure adjusting device is provided with two pressure adjusting loops which are a first pressure adjusting loop 38 and a second pressure adjusting loop 39 respectively, wherein the first pressure adjusting loop 38 is connected with the first compressed air storage cylinder 21, and the second pressure adjusting loop 39 is connected with the second compressed air storage cylinder 22; the redundant control pressure path 35 is connected to the first brake port 4 or the second brake port 5 of the foot brake valve 14, and the first pressure regulating circuit 38 and the second pressure regulating circuit 39 can be regulated independently of each other by the electronic control unit 3; the first pressure regulating circuit 38 has its own first exhaust path 31, the second pressure regulating circuit 39 has its own second exhaust path 32, the first pressure regulating circuit 38, the second pressure regulating circuit 39 have a common redundant control pressure path 35 for regulating the first pressure-increasing solenoid valve 23, the second pressure-increasing solenoid valve 24, the first pressure-reducing solenoid valve 25, the second pressure-reducing solenoid valve 26, the first redundant control valve 27, the second redundant control valve 28 on the first pressure regulating circuit 38, the second pressure regulating circuit 39;
distributing the pressure of the redundant control pressure path 35 to a first pressure regulating circuit 38 through a first redundant control valve 27 and to a second pressure regulating circuit 39 through a second redundant control valve 28 for pressure regulation;
step three, the first pressure regulating circuit 38 has three solenoid valves of the control flow path, namely a first pressure increasing solenoid valve 23, a first pressure reducing solenoid valve 25 and a first redundant control valve 27, wherein the first pressure regulating circuit 38 has a controlled intake air quantity, a first relay valve 33 is pneumatically operated, wherein the first pressure increasing solenoid valve 23 is in a closed state in the absence of current, is connected to the first compressed air reservoir 21 on the input side and is connected to the first relay valve 33 on the output side, wherein the first pressure reducing solenoid valve 25 is in a closed state in the absence of current, is connected to the first pressure increasing solenoid valve 23 on the input side and is connected to the first exhaust path 31 on the output side, wherein the first redundant control valve 27 is connected to the first brake port 4 of the foot brake valve 14 on the input side and is connected to the first relay valve 33 on the output side, wherein the first relay valve 33 is connected to the first working pressure connection 36 and the first exhaust path 31 on the output side of the first compressed air reservoir 21 The diameter 31 is connected;
the solenoid valves in which the second pressure regulating circuit 39 has three control flow paths, the second pressure-increasing solenoid valve 24, the second pressure-reducing solenoid valve 26, and the second redundant control valve 28; the second pressure regulating circuit 39 regulates the intake air amount, pneumatically operates the second relay valve 34; the second pressure solenoid valve 24 is in the closed state without current, is connected on the input side to the second compressed air reservoir 22 and on the output side to the second relay valve 34; the second pressure reducing solenoid valve 26 is in a closed state without current, is connected on the input side to the output side of the second pressure increasing solenoid valve 24, and is connected on the output side to the second exhaust path 32; the second redundant control valve 28 is connected on the input side to the first brake port 4 of the foot brake valve 14 and on the output side to a second relay valve 34, wherein the second relay valve 34 is connected to a second working pressure connection 37 on the output side of the second compressed air reservoir 22 and to the second exhaust gas path 32;
step four, the first pressure regulating circuit 38 and the second pressure regulating circuit 39 distribute air pressure for the left front wheel brake 10, the right front wheel brake 11, the left rear wheel brake 12 and the right rear wheel brake 13; in the case of normal driving, acceleration-or deceleration-related driving safety, including the activation of an anti-lock system, an acceleration-sideslip prevention control or an electronic stability regulation, the brake pressures at the left front wheel brake 10, the right front wheel brake 11, the left rear wheel brake 12 and the right rear wheel brake 13 in question can be individually regulated as required;
step five, under the condition of circuit failure, the first brake port 4 of the foot brake valve 14 sends out brake air pressure, and the brake air pressure enters a first pressure regulating circuit 38 and a second pressure regulating circuit 39 to serve as a left front wheel brake 10 and a right front wheel brake 11; the second brake port 5 sends out brake air pressure to enter the first pressure regulating circuit 38 and the second pressure regulating circuit 39, and the left rear wheel brake 12 and the right rear wheel brake 13 distribute the air pressure.
In fig. 1, pneumatic connection lines are indicated by solid lines and electric wiring lines are indicated by broken lines in order to distinguish pneumatic wiring lines and electric wiring lines of the respective modules.
The brake system shown in fig. 1 has a first pressure control circuit 38 and a second pressure control circuit 39, a foot brake valve 14, a first compressed air reservoir 21, a second compressed air reservoir 22, and a left front wheel 6, a right front wheel 7 for the first axle brake circuit and a left rear wheel 8, a right rear wheel 9 for the second axle brake circuit, which, in the event of the activation of an anti-lock system, an acceleration anti-sideslip control device or an electronic ride control device, specifically regulate the brake cylinder pressure of the wheel brakes for the wheels. Furthermore, a trailer brake 41, which can be supplied by a third compressed air reservoir 40 via the associated line, and an electrical connection 42 for the trailer are shown, the construction and use of which are not critical here. Also not shown is the parking brake device present.
A control method for a double-channel air pressure adjusting device of an electric control brake system is characterized in that the double-channel air pressure adjusting device is connected with a first compressed air storage cylinder 21 and a second compressed air storage cylinder 22 through pipelines. The branch through these lines is connected to the first brake port 4 and to the second brake port 5, so that the foot brake valve 14 is pneumatically connected to the same two-way air pressure regulating device.
The control method of the double-channel air pressure regulating device is connected with an electronic control unit 3, a wheel speed on a left front wheel 6, a right front wheel 7, a left rear wheel 8 and a right rear wheel 9, a first abrasion sensor 17, a wheel speed, a second abrasion sensor 18, a wheel speed, a third abrasion sensor 19, a wheel speed and a fourth abrasion sensor 20 (such as abrasion measurement for a brake block and/or measurement for a wheel rotating speed) through electric circuits. Furthermore, the foot brake valve 14 is connected to the electronic control unit 3 via an electrical line.
Referring to fig. 2, the dual-channel pneumatic adjustment device is combined with the electronic control unit 3 to form a structural unit, and the electronic control unit 3 has a first plug position 48, a second plug position 49, and a third plug position 50 for connecting the three plug positions. However, in (fig. 2) the pneumatic wiring of the components is mainly shown.
The two-channel pneumatic control device has a first pressure control circuit 38 and a second pressure control circuit 39, the first pressure control circuit 38 being assigned to a left wheel axle brake circuit and the second pressure control circuit 39 being assigned to a right wheel axle brake circuit.
The first pressure regulating circuit 38 has three control flow path solenoid valves, a first pressure boost solenoid valve 23, a first pressure reduction solenoid valve 25, and a first redundant control valve 27, and has a pneumatically operable first relay valve 33. The coils of the three solenoid valves are connected to the electronic control unit 3 and form the control unit of the first pressure regulating circuit 38. The first relay valve 33 regulates (i.e., pressurizes or depressurizes) the amount of compressed air in the first pressure regulating circuit 38. To this is assigned a first pressure sensor 29, which is connected to the electronic control unit 3 via an electrical line indicated by a dashed line.
The first booster solenoid valve 23 is configured in a closed state in the absence of current. It is connected on the input side to the first compressed air reservoir 21 and on the output side to the first relay valve 33. Wherein the first pressure reducing solenoid valve 25 is in a closed state in the absence of current. The input side is connected to the output side of the first booster solenoid valve 23, and the output side is connected to the first exhaust path 31. A first muffler 46 is arranged in the first exhaust path 31 for noise reduction.
The first redundant control valve 27 is connected on the input side via a redundant control pressure path 35 to the first brake port 4 and on the output side to the first relay valve 33. The first relay valve 33 is connected to the first compressed air cylinder 21, the first working pressure connector 36 on the output side, and the first exhaust path 31.
The second pressure regulating circuit 39 has three control flow path solenoid valves, a second boost solenoid valve 24, a second pressure reducing solenoid valve 26, and a second redundant control valve 28, and has a pneumatically operable second relay valve 34. The coils of the three solenoid valves are connected to the electronic control unit 3 and form the control unit of the second pressure regulating circuit 39. The second relay valve 34 regulates (i.e., pressurizes or depressurizes) the amount of compressed air in the second pressure regulating circuit 39. To this is assigned a second pressure sensor 30, which is connected to the electronic control unit 3 via an electrical line indicated by a dashed line.
The second boost solenoid valve 24 is configured to be in a closed state with no current. It is connected on the input side to the second compressed air reservoir 22 and on the output side to the second relay valve 34. Wherein second pressure relief valve 26 is closed in the absence of current. Connected on the input side to the output side of the second pressure build-up solenoid valve 24 and on the output side to the second exhaust gas path 32. A second muffler 47 is arranged in the second exhaust gas path 32 for noise reduction.
The second redundant control valve 28 is connected on the input side to the first brake port 4 via a redundant control pressure path 35 and on the output side to a second relay valve 34. The second relay valve 34 is connected to the second compressed air cylinder 22, the output-side second working pressure connection 37, and the second exhaust path 32.
It should be mentioned at this point that the first brake port 4 shown in fig. 1 is provided for the case in which the steering spindle single-pressure control circuit likewise has a redundant control pressure path. In this case, the individual first pressure control circuits 38 are constructed in the same manner. In conjunction with the ABS valve 44 to ensure braking action of the left front wheel 6. In conjunction with the ABS valve 45 to ensure the braking action of the right front wheel 7.
In normal, interference-free electronically regulated brake operation, the second brake port 5 generates the required brake pressures for the left rear wheel brake 12 and the right rear wheel brake 13, corresponding to the brake signal of the foot brake 14, for the rear axle double-acting pressure regulation circuit, the first pressure regulation circuit 38 and the second pressure regulation circuit 39; the first brake port 4 generates the required brake pressures for the left and right front wheel brakes 10, 11 for a single pressure regulation circuit of the front axle.
The redundant control pressure path 35 is pressurized by the second brake port 5. In the event of failure of the electronic control unit 3, the pressure passes through the first pressure regulating circuit 38 via the open first redundant control valve 27; no uncontrolled or undesired braking action is produced by the open second redundant control valve 28 through the second pressure regulating circuit 39.
The redundant control pressure path 35 is pressurized by the first brake port 4. In the event of failure of the electronic control unit 3, this pressure is passed through the first pressure regulating circuit 38 via the open first redundant control valve 27, in conjunction with the ABS valve 44, so as to ensure braking action of the front left wheel 6. In conjunction with the ABS valve 45 to ensure the braking action of the right front wheel 7. No uncontrolled or undesired braking action occurs.
The first plug-in position 48 is used for data acquisition of wheel expansion functions such as wheel speed acquisition and brake pad abrasion acquisition; the second plug position 49 is used for interactive communication with the ECU; the third plugging position 50 is used for bridge expansion interactive communication of a third bridge, a fourth bridge and the like of the dual-channel air pressure adjusting device.
Two loops of each double-channel air pressure adjusting device can only control two wheels, and a left rear wheel brake 12 and a right rear wheel brake 13 are sent out by the second brake port 5, and refer to fig. 1.
Claims (3)
1. The double-channel air pressure adjusting device for the electric control brake system comprises two pressure adjusting loops, namely a first pressure adjusting loop (38) and a second pressure adjusting loop (39); the pressure control device is characterized in that the first pressure regulating circuit (38) and the second pressure regulating circuit (39) can be independently regulated through the electric control unit (3); the first pressure regulating circuit (38) has its own first exhaust path (31), and the second pressure regulating circuit (39) has its own second exhaust path (32); the first pressure regulating circuit (38) and the second pressure regulating circuit (39) have a common redundant control pressure path (35); the redundant control pressure path (35) is respectively connected with a first pressure increasing electromagnetic valve (23), a first pressure reducing electromagnetic valve (25) and a first redundant control valve (27) on the first pressure regulating circuit (38), and a second pressure increasing electromagnetic valve (24), a second pressure reducing electromagnetic valve (26) and a second redundant control valve (28) on the second pressure regulating circuit (39); the redundant control pressure path (35) regulates a first pressure-increasing solenoid valve (23), a second pressure-increasing solenoid valve (24), a first pressure-reducing solenoid valve (25), a second pressure-reducing solenoid valve (26), a first redundant control valve (27), and a second redundant control valve (28) on the first pressure-regulating circuit (38) and the second pressure-regulating circuit (39).
2. A dual channel air pressure regulator for an electric control brake system according to claim 1, wherein the electric control unit (3) is further connected to a first plug-in position (48), a first plug-in position (49) and a third plug-in position (50).
3. The control method for the dual-channel air pressure adjusting device of the electric control brake system is characterized by comprising the following steps of:
the method comprises the steps that firstly, a left front wheel brake (10), a right front wheel brake (11), a left rear wheel brake (12) and a right rear wheel brake (13) which can be operated pneumatically are respectively arranged on a left front wheel (6), a right front wheel (7), a left rear wheel (8) and a right rear wheel (9) which are braked; the double-channel pressure regulating device is provided with two pressure regulating circuits which are a first pressure regulating circuit (38) and a second pressure regulating circuit (39), wherein the first pressure regulating circuit (38) is connected with a first compressed air storage cylinder (21), and the second pressure regulating circuit (39) is connected with a second compressed air storage cylinder (22); the redundant control pressure path (35) is connected with the first brake port (4) or the second brake port (5) of the foot brake valve (14), and the first pressure regulating circuit (38) and the second pressure regulating circuit (39) can be independently regulated through the electric control unit (3); the first pressure regulating circuit (38) is provided with a first exhaust path (31) and the second pressure regulating circuit (39) is provided with a second exhaust path (32), the first pressure regulating circuit (38) and the second pressure regulating circuit (39) are provided with a common redundant control pressure path (35) and are used for regulating a first pressure increasing electromagnetic valve (23), a second pressure increasing electromagnetic valve (24), a first pressure reducing electromagnetic valve (25), a second pressure reducing electromagnetic valve (26), a first redundant control valve (27) and a second redundant control valve (28) on the first pressure regulating circuit (38) and the second pressure regulating circuit (39);
secondly, distributing the pressure with the redundant control pressure path (35) to a first pressure regulating circuit (38) through a first redundant control valve (27) and distributing the pressure to a second pressure regulating circuit (39) through a second redundant control valve (28) for pressure regulation;
a third step, in which the first pressure control circuit (38) has three solenoid valves of the control flow path, namely a first pressure build-up solenoid valve (23), a first pressure reduction solenoid valve (25) and a first redundant control valve (27), wherein the first pressure control circuit (38) has a controlled intake air quantity, pneumatically actuates the first relay valve (33), wherein the first pressure build-up solenoid valve (23) is in a closed state in the absence of current, is connected on the input side to the first compressed air reservoir (21) and on the output side to the first relay valve (33), wherein the first pressure reduction solenoid valve (25) is in a closed state in the absence of current, is connected on the input side to the output side of the first pressure build-up solenoid valve (23), and is connected on the output side to the first exhaust path (31), wherein the first redundant control valve (27) is connected on the input side to the first brake port (4) of the foot brake valve (14) and on the output side to the first relay valve (33), wherein the first relay valve (33) is connected with a first working pressure joint (36) at the output side of the first compressed air cylinder (21) and the first exhaust path (31);
the second pressure regulating circuit (39) is provided with three solenoid valves of control flow paths, namely a second pressure increasing solenoid valve (24), a second pressure reducing solenoid valve (26) and a second redundant control valve (28); a second pressure regulating circuit (39) regulates and controls air inflow and pneumatically operates a second relay valve (34); the second pressure solenoid valve (24) is in the closed state without current, is connected on the input side to a second compressed air reservoir (22) and on the output side to a second relay valve (34); the second pressure reducing solenoid valve (26) is in a closed state when no current is supplied, is connected to the output side of the second pressure increasing solenoid valve (24) on the input side, and is connected to the second exhaust path (32) on the output side; the second redundant control valve (28) is connected on the input side to the first brake port (4) of the foot brake valve (14) and on the output side to a second relay valve (34), wherein the second relay valve (34) is connected to a second working pressure connection (37) on the output side of the second compressed air reservoir (22) and to a second exhaust gas line (32);
fourthly, the first pressure regulating circuit (38) and the second pressure regulating circuit (39) distribute air pressure for the left front wheel brake (10), the right front wheel brake (11), the left rear wheel brake (12) and the right rear wheel brake (13); under the condition of normal running, acceleration or deceleration related running safety, including the condition of activating an anti-lock system, an acceleration anti-sideslip control device or an electronic stability adjusting device, the brake pressure on the left front wheel brake (10), the right front wheel brake (11), the left rear wheel brake (12) and the right rear wheel brake (13) can be independently adjusted according to requirements;
step five, under the condition of circuit failure, a first brake port (4) of a foot brake valve (14) sends out brake air pressure, and the brake air pressure enters a first pressure regulating circuit (38) and a second pressure regulating circuit (39) and is used as a left front wheel brake (10) and a right front wheel brake (11); the second brake port (5) sends out brake air pressure, the brake air pressure enters a first pressure regulating circuit (38) and a second pressure regulating circuit (39), and the left rear wheel brake (12) and the right rear wheel brake (13) distribute the air pressure.
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| CN202010529963.6A CN111591270A (en) | 2020-06-11 | 2020-06-11 | Double-channel air pressure adjusting device for electric control braking system and control method thereof |
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| CN202010529963.6A CN111591270A (en) | 2020-06-11 | 2020-06-11 | Double-channel air pressure adjusting device for electric control braking system and control method thereof |
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