CN115071654A - Parking brake-based vehicle emergency brake control system and method - Google Patents

Abstract

The invention provides a vehicle emergency brake control system based on parking brake.A service brake air cylinder is connected with an air inlet of a front axle brake air chamber through a first air inlet end of a main brake valve, an ABS electromagnetic valve and a two-way check valve; the parking brake air cylinder is respectively connected with the air inlet ends of the hand brake valve, the relay valve and the proportional relay valve through the pressure reducing valve, one path of the air outlet end of the hand brake valve is connected with the control end of the relay valve, the relay valve is connected with the rear axle brake air chamber, the other path of the air outlet end of the hand brake valve is connected with the control end of the proportional relay valve, the service brake control implements brake control on the front axle brake air chamber through the first air inlet end of the two-way one-way valve, and the parking brake control implements brake control on the front axle brake air chamber and the rear axle brake air chamber through the second air inlet end of the two-way one-way valve.

Description

A vehicle emergency braking control system and method based on parking brake

technical field

The present invention relates to the field of commercial vehicle braking control, in particular to a vehicle emergency braking control system and method based on parking braking.

Background technique

Commercial vehicles generally use a pneumatic braking system, where compressed air drives the vehicle brakes for braking. In addition to the size of the braking force of the vehicle depends on the size of the brake air pressure, the size of the brake and the size of the brake chamber, the vehicle axle load is also a crucial factor in determining the size of the braking force generated by the vehicle. For two-axle vehicles, the front axle is generally a single-chamber brake air chamber (only for service braking), and the rear axle is a dual-chamber brake air chamber, which can realize spring energy storage parking brake. Carry out emergency braking test when the vehicle is unloaded, especially for vehicles with large front axle axle load, because the rear axle axle load is too low, whether it is service braking (only rear axle braking in case of front axle failure), or parking brake Vehicle brakes cannot meet the requirements of national standards for vehicle emergency braking performance.

In the prior art, one solution is to increase the axle load of the rear axle under no-load condition through the rational distribution design of the axle load of the chassis. This solution is to increase the rear axle load and reduce the front axle load when the vehicle is unloaded, under the condition that the total axle load of the vehicle remains unchanged. Because the layout positions of the vehicle cab, powertrain, etc. are all fixed, the distribution of the vehicle axle load can only be changed by adjusting the positions of other accessories, thereby increasing the rear axle axle load under no-load conditions, and the ability to improve is limited. The improvement of braking efficiency is also very limited, and it is difficult to meet the requirements of national standards.

Another solution is: by changing the brake air chambers of the front axle into double-chamber brake air chambers, the spring energy storage parking brake can be realized, which can improve the emergency braking efficiency of the vehicle and meet the requirements of national standards. However, since the front axle is a steering axle, after the brake air chambers of the front axle are changed to double-chamber brake air chambers, the size of the brake air chamber becomes larger, and the brake air chamber interferes with other parts of the chassis during steering, resulting in the steering performance of the vehicle. Can not meet the requirements, to avoid interference, it is necessary to redesign the front axle and steering system, which is difficult to achieve.

SUMMARY OF THE INVENTION

In order to solve the problems existing in the prior art, the present invention innovatively proposes a vehicle emergency braking control system and method based on the parking brake, which effectively solves the problem of low vehicle emergency braking efficiency caused by the prior art, and effectively Increased vehicle emergency braking efficiency.

A first aspect of the present invention provides a vehicle emergency braking control system based on parking brake, comprising: a service brake air reservoir, a brake master valve, an ABS solenoid valve, a two-way check valve, a parking brake reservoir Air cylinder, hand brake valve, relay valve, pressure reducing valve, proportional relay valve, front axle brake air chamber, rear axle brake air chamber, the air outlet of the service brake air reservoir and the intake of the brake master valve The outlet end of the brake master valve is connected with the inlet end of the ABS solenoid valve, the outlet end of the ABS solenoid valve is connected with the first inlet end of the two-way check valve, and the outlet end of the two-way check valve is connected to the front The air inlet of the axle brake air chamber is connected; the air outlet end of the parking brake air reservoir is connected with the air inlet end of the pressure reducing valve, and the air outlet end of the pressure reducing valve is respectively connected with the hand brake valve, relay valve and proportional relay. The air inlet end of the valve is connected, the air outlet end of the hand brake valve is connected with the control end of the relay valve all the way, the air outlet end of the relay valve is connected with the air inlet end of the rear axle brake air chamber, and the air outlet end of the hand brake valve is another One way is connected to the control end of the proportional relay valve, and the outlet end of the proportional relay valve is connected to the second air inlet end of the double-way check valve.

Optionally, the service brake control implements brake control on the front axle brake air chamber through the first intake end of the two-way check valve.

Further, the service brake control implements brake control on the front axle brake air chamber through the first air intake end of the two-way check valve. Specifically, when the driver steps on the brake pedal, the compressed air passes through the brake master valve. The outlet end of the ABS solenoid valve flows to the inlet end of the ABS solenoid valve, and flows to the first inlet end of the two-way check valve through the outlet end of the ABS solenoid valve, and then the compressed air flows to the front axle brake air through the outlet end of the two-way check valve. The intake end of the chamber controls the front axle brake air chamber to implement braking control.

Optionally, the parking brake control jointly performs braking control on the front axle brake air chamber and the relay valve on the rear axle brake air chamber through the second intake end of the two-way check valve.

Further, the parking brake control through the second intake end of the two-way check valve to the front axle brake air chamber and the relay valve to the rear axle brake air chamber jointly brake control is specifically:

When the driver pulls up the control handle of the hand brake valve, the compressed air flows all the way to the control end of the relay valve through the outlet end of the hand brake valve, and the compressed air in the parking brake air reservoir passes through the outlet end of the relay valve It flows to the intake end of the rear axle brake air chamber to control the rear axle brake air chamber to release the rear axle parking brake; the compressed air flows through the outlet end of the hand brake valve to the control end of the proportional relay valve, and the proportional relay valve flows to the control end of the proportional relay valve. The compressed air in the pipeline between the outlet end of the dynamic valve and the inlet end of the front axle brake air chamber is discharged from the air outlet end of the proportional relay valve to control the front axle brake air chamber to release the front axle parking brake;

When the driver pulls down the control handle of the handbrake valve, the compressed air in the pipeline between the outlet end of the handbrake valve and the control end of the relay valve is discharged through the outlet end of the handbrake valve, and the relay valve and the rear axle The compressed air between the brake air chambers is discharged through the outlet end of the relay valve to control the rear axle brake air chamber to implement the rear axle parking brake; at the same time, the air outlet end of the hand brake valve and the control end of the proportional relay valve The compressed air in the pipeline is discharged through the outlet end of the hand brake valve, and the compressed air in the parking air reservoir flows through the outlet end of the proportional relay valve to the second inlet end of the two-way check valve, and then the compressed air passes through the The outlet end of the two-way check valve flows into the intake end of the front axle brake air chamber (10), and controls the front axle brake air chamber to implement the front axle parking brake.

Optionally, the outlet end pressure of the proportional relay valve decreases as the control end pressure increases.

Further, the pressure at the outlet end of the proportional relay valve decreases proportionally as the pressure at the control end increases proportionally.

A second aspect of the present invention provides a parking brake-based vehicle emergency braking control method, implemented on the basis of the parking brake-based vehicle emergency braking control system described in the first aspect of the present invention, comprising: :

The service brake control implements brake control on the front axle brake air chamber through the first intake end of the two-way check valve;

The parking brake control jointly performs braking control on the front axle brake air chamber (10) and the relay valve on the rear axle brake air chamber through the second air intake end of the two-way check valve.

Optionally, the service brake control implements brake control on the front axle brake air chamber through the first air intake end of the two-way one-way valve, specifically:

When the driver depresses the brake pedal, the compressed air flows through the outlet end of the master brake valve to the inlet end of the ABS solenoid valve, and then flows to the first inlet end of the two-way check valve through the outlet end of the ABS solenoid valve, and then The compressed air flows to the intake end of the front axle brake air chamber through the air outlet end of the two-way check valve, and controls the front axle brake air chamber to implement braking control.

Optionally, the parking brake control through the second air intake end of the two-way check valve to the front axle brake air chamber and the implementation of the relay valve to the rear axle brake air chamber respectively brake control is specifically:

When the driver pulls up the control handle of the hand brake valve, the compressed air flows all the way to the control end of the relay valve through the outlet end of the hand brake valve, and the compressed air in the parking brake air reservoir passes through the outlet end of the relay valve It flows to the intake end of the rear axle brake air chamber to control the rear axle brake air chamber to release the rear axle parking brake; the compressed air flows through the outlet end of the hand brake valve to the control end of the proportional relay valve, and the proportional relay valve flows to the control end of the proportional relay valve. The compressed air in the pipeline between the outlet end of the dynamic valve and the inlet end of the front axle brake air chamber is discharged from the air outlet end of the proportional relay valve to control the front axle brake air chamber to release the front axle parking brake;

When the driver pulls down the control handle of the handbrake valve, the compressed air in the pipeline between the outlet end of the handbrake valve and the control end of the relay valve is discharged through the outlet end of the handbrake valve, and the relay valve and the rear axle The compressed air between the brake air chambers is discharged through the outlet end of the relay valve to control the rear axle brake air chamber to implement the rear axle parking brake; at the same time, the air outlet end of the hand brake valve and the control end of the proportional relay valve The compressed air in the pipeline is discharged through the outlet end of the hand brake valve, and the compressed air in the parking air reservoir flows through the outlet end of the proportional relay valve to the second inlet end of the two-way check valve, and then the compressed air passes through the The outlet end of the two-way check valve flows into the intake end of the front axle brake air chamber, and controls the front axle brake air chamber to implement the front axle parking brake.

The technical scheme adopted in the present invention includes the following technical effects:

1. The present invention does not need to change the axle load distribution of the vehicle, or change the type of the front axle brake air chamber, and only controls the front axle (front axle) service brake air chamber to perform braking through the parking brake, thereby increasing the emergency braking efficiency of the vehicle. It is easy to implement and low in cost, and effectively solves the problem of low vehicle emergency braking efficiency caused by the prior art.

2. In the technical solution of the present invention, the service brake control implements braking control on the front axle brake air chamber through the first intake end of the two-way one-way valve, and the parking brake is controlled through the second inlet end of the two-way one-way valve. The air end is connected to the front axle brake air chamber and the relay valve is connected to the rear axle brake air chamber, that is, the front axle brake air chamber in the service brake control and the parking brake control share a two-way one-way valve, and further equipment utilization.

3. In the technical solution of the present invention, the pressure at the outlet end of the proportional relay valve increases proportionally with the pressure at the control end and decreases proportionally, which further increases the emergency braking efficiency of the vehicle.

It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not limiting of the invention.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, On the premise of no creative work, other drawings can also be obtained based on these drawings.

Fig. 1 is the structural schematic diagram of the system of Example 1 in the scheme of the present invention;

Fig. 2 is a schematic diagram of the characteristic curve of the proportional relay valve in the system of Example 1 in the solution of the present invention;

FIG. 3 is a schematic flow chart of the method of Example 2 in the scheme of the present invention.

In Figure 1: 1- Service brake air reservoir, 2- Brake master valve, 3- ABS solenoid valve, 4- Two-way check valve, 5- Parking brake air reservoir, 6- Hand brake valve, 7- - Relay valve, 8- pressure reducing valve, 9- proportional relay valve, 10- front axle brake air chamber, 11- rear axle brake air chamber.

Detailed ways

In order to clearly illustrate the technical characteristics of the present solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted from the present invention to avoid unnecessarily limiting the present invention.

Example 1

As shown in FIG. 1, the present invention provides a vehicle emergency braking control system based on parking brake, including: a service brake air reservoir 1, a master brake valve 2, an ABS solenoid valve 3, and a two-way check valve 4. Parking brake air reservoir 5, hand brake valve 6, relay valve 7, pressure reducing valve 8, proportional relay valve 9, front axle brake air chamber 10, rear axle brake air chamber 11, driving system The outlet end of the dynamic air reservoir 1 is connected with the inlet end of the brake master 2, the outlet end of the brake master valve 2 is connected with the inlet end of the ABS solenoid valve 3, and the outlet end of the ABS solenoid valve 3 is connected with the two-way check valve. 4 is connected to the first air inlet end, and the air outlet end of the two-way check valve 4 is connected to the air inlet of the front axle brake air chamber 10; The air outlet end of the pressure reducing valve 8 is connected to the air inlet end of the hand brake valve 6, the relay valve 7 and the proportional relay valve 9 respectively, and the air outlet end of the hand brake valve 6 is connected to the control of the relay valve 7. The outlet end of the relay valve 7 is connected with the inlet end of the rear axle brake air chamber 11, and the outlet end of the hand brake valve 6 is connected with the control end of the proportional relay valve 9. The second inlet end of the two-way check valve 4 at the outlet end is connected.

Specifically, the service brake control implements brake control on the front axle brake chamber 10 through the first intake end of the two-way check valve 4.

Specifically, the service braking control implements braking control on the front axle brake air chamber 10 through the first intake end of the two-way check valve 4. Specifically, when the driver depresses the brake pedal, the compressed air passes through the brake pedal. The outlet end of the main valve 2 flows to the inlet end of the ABS solenoid valve 3, and flows through the outlet end of the ABS solenoid valve 3 to the first inlet end of the two-way check valve 4, and then the compressed air passes through the outlet of the two-way check valve 4. The end flows into the intake end of the front axle brake air chamber 10, and controls the front axle brake air chamber 10 to implement braking control.

Further, the parking brake control jointly performs braking control on the front axle brake air chamber 10 and the relay valve on the rear axle brake air chamber 11 through the second intake end of the two-way check valve 4.

Specifically, the parking brake control jointly performs braking control on the front axle brake air chamber 10 and the relay valve 7 on the rear axle brake air chamber 11 through the second intake end of the two-way check valve 4. Specifically:

When the driver pulls up the control handle of the hand brake valve 6, the compressed air flows all the way to the control end of the relay valve 7 through the outlet end of the hand brake valve 6, and the compressed air in the parking brake air reservoir 5 passes through the relay valve 7. The outlet end of the valve 7 flows to the intake end (parking port) of the rear axle brake air chamber 11, and controls the rear axle brake air chamber 11 to release the rear axle parking brake; the compressed air passes through the air outlet end of the hand brake valve 6 The other path flows to the control end of the proportional relay valve 9, and the compressed air in the pipeline between the air outlet end of the proportional relay valve 9 and the intake end of the front axle brake air chamber 10 is discharged from the air outlet end of the proportional relay valve 9 , control the front axle brake air chamber 10 to release the front axle parking brake;

When the driver pulls down the control handle of the handbrake valve 6, the compressed air in the pipeline between the outlet end of the handbrake valve 6 and the control end of the relay valve 7 is discharged through the outlet end of the handbrake valve 6, and the relay The compressed air between the valve 7 and the rear axle brake air chamber 11 is discharged through the outlet end of the relay valve 7 to control the rear axle brake air chamber 11 to implement the rear axle parking brake; at the same time, the air outlet of the hand brake valve 6 The compressed air in the pipeline between the control end of the proportional relay valve 9 and the control end of the proportional relay valve 9 is discharged through the outlet end of the hand brake valve 6, and the compressed air in the parking air tank 5 flows through the outlet end of the proportional relay valve 9 to the two-way single valve. To the second intake end of the valve 4, then the compressed air flows to the intake end of the front axle brake air chamber 10 through the air outlet end of the two-way check valve 4, and controls the front axle brake air chamber 10 to implement the front axle parking brake. verb: move. The emergency braking of the vehicle is jointly implemented by the rear axle brake air chamber 11 and the front axle brake air chamber 10, which increases the emergency braking efficiency and can meet the requirements of the national standard for the emergency braking efficiency of the vehicle.

The compressed air in the driving air tank 1 and the parking air tank 5 comes from the air compressor of the vehicle, and the compressed air generated by the air compressor is dried and pressure-regulated by the air dryer, and then sent to the air tank. When the air compressor inflates the air storage cylinder, when the pressure in the air storage cylinder reaches the working pressure of the air dryer, the unloading valve of the air dryer is opened and unloaded; when the pressure in the air storage cylinder is lower than the inflation pressure of the air dryer , the unloading valve closes the air compressor to inflate the air tank.

Preferably, the front axle brake air chamber 10 can be braked by the service brake control and the parking brake control respectively, and the service brake control and the parking brake control are independent of each other and do not interfere with each other.

Because the front axle brake air chamber 10 includes two left and right brake air chambers, that is, the left and right brake air chambers are both single-chamber brake air chambers, when the service brake is implemented, the ABS solenoid valves 3 on the left and right The output air pressure is different, therefore, two ABS solenoid valves 3 and two two-way check valves 4 need to be provided, so that the braking force of the left and right brake air chambers 10 can be precisely controlled respectively.

The rear axle brake air chamber 11 also includes two left and right brake air chambers, that is, the left and right brake air chambers of the rear axle brake air chamber 11 are both double-chamber brake air chambers, so the outlet end of the relay valve 7 It is respectively connected with the left and right brake air chambers between the rear axle brake air chambers 11, and the compressed air between the relay valve 7 and the left and right brake air chambers is discharged through the outlet end of the relay valve 7, respectively, to control the rear axle brakes. The dynamic air chamber 11 implements the rear axle parking brake; the compressed air in the parking brake air storage cylinder 5 flows through the outlet end of the relay valve 7 to the air inlet ends of the left and right brake air chambers in the rear axle brake air chamber 11 respectively. , control the rear axle brake air chamber 11 to release the rear axle parking brake.

As shown in Fig. 2, the outlet side pressure (P outlet port) of the proportional relay valve 9 decreases as the control side pressure (P control port) increases. Specifically, the pressure at the outlet end of the proportional relay valve 9 decreases proportionally with the pressure at the control end, that is, the characteristic curve of the proportional relay valve is a straight line, and the hand brake valve 6 controls the rear axle to implement the parking brake. That is, the relay valve 7 (rear axle relay valve) is controlled by the hand brake valve 6, so that the compressed air in the spring cavity in the rear axle brake air chamber 11 is discharged through the relay valve 7, so that the spring force acts on the brake Generates parking brake force.

The hand brake valve 6 controls the front axle brake air chamber to implement the parking brake as a vent brake, that is, the proportional relay valve 9 is controlled by the hand brake valve 6, and the compressed air is output to the front axle brake air chamber 10 (front brake air chamber 10). The left and right brake air chambers in the axle brake air chambers 10) make the brakes generate the parking braking force. The two parking brake forces (the front axle brake air chamber for braking and the rear axle brake air chamber for braking) are implemented simultaneously, so the output pressure of the proportional relay valve 9 decreases as the control terminal pressure increases (or Output pressure increases as control port pressure decreases).

The invention does not need to change the axle load distribution of the vehicle or change the type of the brake air chamber of the front axle, and only controls the front axle (front axle) service brake air chamber to perform braking through the parking brake, thereby increasing the emergency braking efficiency of the vehicle, and is easy to implement. , the cost is low, and the problem of low vehicle emergency braking efficiency caused by the prior art is effectively solved.

In the technical solution of the present invention, the service brake control implements braking control on the front axle brake air chamber through the first intake end of the two-way one-way valve, and the parking brake is controlled through the second intake end of the two-way one-way valve. For the brake air chamber of the front axle and the relay valve to the brake air chamber of the rear axle, that is, the brake air chamber of the front axle in the service brake control and the parking brake control, a two-way one-way valve is shared, and further equipment utilization.

In the technical solution of the present invention, the pressure at the outlet end of the proportional relay valve decreases proportionally with the pressure at the control end increasing in equal proportion, which further increases the emergency braking efficiency of the vehicle.

Embodiment 2

As shown in FIG. 3 , the technical solution of the present invention also provides a parking brake-based vehicle emergency braking control method, which is based on the parking brake-based vehicle emergency braking control system in the first embodiment. implementation, including:

S1, the service brake control implements brake control on the front axle brake air chamber through the first intake end of the two-way check valve;

S2, the parking brake control uses the second intake end of the two-way check valve to jointly control the brake air chamber of the front axle and the brake air chamber of the rear axle by the relay valve.

Wherein, in step S1, the service brake control implements braking control to the front axle brake air chamber through the first air intake end of the two-way one-way valve, specifically:

When the driver depresses the brake pedal, the compressed air flows through the outlet end of the master brake valve to the inlet end of the ABS solenoid valve, and then flows to the first inlet end of the two-way check valve through the outlet end of the ABS solenoid valve, and then The compressed air flows to the intake end of the front axle brake air chamber through the air outlet end of the two-way check valve, and controls the front axle brake air chamber to implement braking control.

Wherein, in step S2, the parking brake control through the second intake end of the two-way check valve to the front axle brake air chamber and the implementation of the relay valve to the rear axle brake air chamber respectively. The brake control is specifically:

When the driver pulls up the control handle of the hand brake valve, the compressed air flows all the way to the control end of the relay valve through the outlet end of the hand brake valve, and the compressed air in the parking brake air reservoir passes through the outlet end of the relay valve It flows to the intake end of the rear axle brake air chamber to control the rear axle brake air chamber to release the rear axle parking brake; the compressed air flows through the outlet end of the hand brake valve to the control end of the proportional relay valve, and the proportional relay valve flows to the control end of the proportional relay valve. The compressed air in the pipeline between the outlet end of the dynamic valve and the inlet end of the front axle brake air chamber is discharged from the air outlet end of the proportional relay valve to control the front axle brake air chamber to release the front axle parking brake;

When the driver pulls down the control handle of the handbrake valve, the compressed air in the pipeline between the outlet end of the handbrake valve and the control end of the relay valve is discharged through the outlet end of the handbrake valve, and the relay valve and the rear axle The compressed air between the brake air chambers is discharged through the outlet end of the relay valve to control the rear axle brake air chamber to implement the rear axle parking brake; at the same time, the air outlet end of the hand brake valve and the control end of the proportional relay valve The compressed air in the pipeline is discharged through the outlet end of the hand brake valve, and the compressed air in the parking air reservoir flows through the outlet end of the proportional relay valve to the second inlet end of the two-way check valve, and then the compressed air passes through the The outlet end of the two-way check valve flows into the intake end of the front axle brake air chamber, and controls the front axle brake air chamber to implement the front axle parking brake.

The invention does not need to change the axle load distribution of the vehicle or change the type of the brake air chamber of the front axle, and only controls the front axle (front axle) service brake air chamber to perform braking through the parking brake, thereby increasing the emergency braking efficiency of the vehicle, and is easy to implement. , the cost is low, and the problem of low vehicle emergency braking efficiency caused by the prior art is effectively solved.

In the technical solution of the present invention, the service brake control implements braking control on the front axle brake air chamber through the first intake end of the two-way one-way valve, and the parking brake is controlled through the second intake end of the two-way one-way valve. For the brake air chamber of the front axle and the relay valve to the brake air chamber of the rear axle, that is, the brake air chamber of the front axle in the service brake control and the parking brake control, a two-way one-way valve is shared, and further equipment utilization.

In the technical solution of the present invention, the pressure at the outlet end of the proportional relay valve decreases proportionally with the pressure at the control end increasing in equal proportion, which further increases the emergency braking efficiency of the vehicle.

Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, they do not limit the scope of protection of the present invention. Those skilled in the art should understand that on the basis of the technical solutions of the present invention, those skilled in the art do not need to pay creative efforts. Various modifications or deformations that can be made are still within the protection scope of the present invention.

Claims (10)

1. A vehicle emergency braking control system based on parking brake, characterized in that it comprises: a service brake air reservoir (1), a master brake valve (2), an ABS solenoid valve (3), a two-way single Directional valve (4), parking brake air reservoir (5), hand brake valve (6), relay valve (7), pressure reducing valve (8), proportional relay valve (9), front axle brake The air chamber (10), the rear axle brake air chamber (11), the air outlet end of the service brake air reservoir (1) is connected with the air inlet end of the brake master valve (2), and the air outlet end of the brake master valve (2) The air inlet end of the ABS solenoid valve (3) is connected with the air inlet end of the ABS solenoid valve (3). The end is connected with the air inlet of the front axle brake air chamber (10); the air outlet end of the parking brake air reservoir (5) is connected with the air inlet end of the pressure reducing valve (8), and the air outlet The terminals are respectively connected with the air intake ends of the hand brake valve (6), the relay valve (7) and the proportional relay valve (9). The control end is connected, the air outlet end of the relay valve (7) is connected with the air intake end of the rear axle brake air chamber (11), and the other way of the air outlet end of the hand brake valve (6) is controlled by the proportional relay valve (9). The air outlet end of the proportional relay valve (9) is connected to the second air inlet end of the two-way check valve (4). 2. A vehicle emergency braking control system based on parking brake according to claim 1, characterized in that, the service braking control is applied to the front axle through the first air intake end of the two-way check valve (4). The brake air chamber (10) implements braking control. 3. A vehicle emergency braking control system based on parking brake according to claim 2, characterized in that, the service braking control is applied to the front axle through the first air intake end of the two-way check valve (4). The brake air chamber (10) implements the braking control specifically: when the driver steps on the brake pedal, the compressed air flows through the outlet end of the master brake valve (2) to the air inlet end of the ABS solenoid valve (3), The air outlet end of the ABS solenoid valve (3) flows to the first air intake end of the two-way check valve (4), and then the compressed air flows through the air outlet end of the two-way check valve (4) to the front axle brake air chamber (10) At the intake end, the front axle brake air chamber (10) is controlled to implement braking control. 4. A vehicle emergency braking control system based on parking brake according to claim 2, characterized in that, the parking brake is controlled to the front through the second intake end of the two-way check valve (4) The axle brake air chamber (10) and the relay valve (7) jointly perform braking control on the rear axle brake air chamber (11). 5. A vehicle emergency braking control system based on parking brake according to claim 4, characterized in that, the parking brake is controlled to the front through the second intake end of the two-way check valve (4) The axle brake air chamber (10) and the relay valve (7) jointly perform braking control on the rear axle brake air chamber (11), specifically: When the driver pulls up the control handle of the hand brake valve (6), the compressed air flows through the outlet end of the hand brake valve (6) all the way to the control end of the relay valve (7), and the parking brake air reservoir (5) ) in the compressed air flows to the intake end of the rear axle brake air chamber (11) through the outlet end of the relay valve (7) to control the rear axle brake air chamber (11) to release the rear axle parking brake; the compressed air The other way through the outlet end of the hand brake valve (6) flows to the control end of the proportional relay valve (9). The compressed air in the intermediate pipeline is discharged from the outlet end of the proportional relay valve (9) to control the front axle brake air chamber (10) to release the front axle parking brake; When the driver pulls down the control handle of the handbrake valve (6), the compressed air in the pipeline between the outlet end of the handbrake valve (6) and the control end of the relay valve (7) passes through the handbrake valve (6). ) is discharged from the outlet end of the relay valve (7) and the compressed air between the relay valve (7) and the rear axle brake air chamber (11) is discharged through the air outlet end of the relay valve (7) to control the rear axle brake air chamber (11) to implement Rear axle parking brake; at the same time, the compressed air in the pipeline between the air outlet end of the hand brake valve (6) and the control end of the proportional relay valve (9) is discharged through the air outlet end of the hand brake valve (6), The compressed air in the parking air reservoir (5) flows through the outlet end of the proportional relay valve (9) to the second inlet end of the two-way check valve (4), and then the compressed air passes through the two-way check valve (4) The air outlet end flows into the intake end of the front axle brake air chamber (10), and controls the front axle brake air chamber (10) to implement the front axle parking brake. 6. A vehicle emergency braking control system based on parking brake according to any one of claims 1-5, wherein the pressure at the outlet end of the proportional relay valve (9) increases as the pressure at the control end increases. reduce. 7. A vehicle emergency braking control system based on parking brake according to claim 6, characterized in that the pressure at the outlet end of the proportional relay valve (9) decreases proportionally with the proportional increase in the pressure at the control end . 8. A vehicle emergency braking control method based on parking brake, characterized in that, based on the parking brake-based vehicle emergency braking control system described in any one of claims 1-7, it is realized on the basis of ,include: The service brake control implements brake control on the front axle brake air chamber (10) through the first intake end of the two-way check valve (4); The parking brake control jointly controls the front axle brake air chamber (10) and the relay valve (7) to the rear axle brake air chamber (11) through the second air intake end of the two-way check valve (4). motion control. 9 . The vehicle emergency braking control method based on the parking brake according to claim 8 , wherein the service braking control is applied to the front axle through the first air intake end of the two-way check valve ( 4 ). 10 . The braking control of the brake air chamber (10) is specifically: When the driver depresses the brake pedal, the compressed air flows through the outlet end of the master brake valve (2) to the inlet end of the ABS solenoid valve (3), and flows to the two-way one-way through the outlet end of the ABS solenoid valve (3). The first intake end of the valve (4), and then the compressed air flows to the intake end of the front axle brake air chamber (10) through the air outlet end of the two-way check valve (4) to control the front axle brake air chamber (10). ) to implement brake control. 10. A vehicle emergency braking control method based on parking brake according to claim 8, characterized in that, the parking brake is controlled through the second air intake end of the two-way check valve (4) to the front The axle brake air chamber (10) and the implementation of the relay valve (7) respectively perform braking control on the rear axle brake air chamber (11), specifically: When the driver pulls up the control handle of the hand brake valve (6), the compressed air flows through the outlet end of the hand brake valve (6) all the way to the control end of the relay valve (7), and the parking brake air reservoir (5) ) in the compressed air flows to the intake end of the rear axle brake air chamber (11) through the outlet end of the relay valve (7) to control the rear axle brake air chamber (11) to release the rear axle parking brake; the compressed air The other way through the outlet end of the hand brake valve (6) flows to the control end of the proportional relay valve (9). The compressed air in the intermediate pipeline is discharged from the outlet end of the proportional relay valve (9) to control the front axle brake air chamber (10) to release the front axle parking brake; When the driver pulls down the control handle of the handbrake valve (6), the compressed air in the pipeline between the outlet end of the handbrake valve (6) and the control end of the relay valve (7) passes through the handbrake valve (6). ) is discharged from the outlet end of the relay valve (7) and the compressed air between the relay valve (7) and the rear axle brake air chamber (11) is discharged through the air outlet end of the relay valve (7) to control the rear axle brake air chamber (11) to implement Rear axle parking brake; at the same time, the compressed air in the pipeline between the air outlet end of the hand brake valve (6) and the control end of the proportional relay valve (9) is discharged through the air outlet end of the hand brake valve (6), The compressed air in the parking air reservoir (5) flows through the outlet end of the proportional relay valve (9) to the second inlet end of the two-way check valve (4), and then the compressed air passes through the two-way check valve (4) The air outlet end flows into the intake end of the front axle brake air chamber (10), and controls the front axle brake air chamber (10) to implement the front axle parking brake.

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