CN212529611U

CN212529611U - Pneumatic integrated electronic parking system for commercial vehicle

Info

Publication number: CN212529611U
Application number: CN202021535037.1U
Authority: CN
Inventors: 杨凡; 程毅
Original assignee: Wuhan Fu'an Technology Co ltd
Current assignee: Wuhan Fu'an Technology Co ltd
Priority date: 2020-07-29
Filing date: 2020-07-29
Publication date: 2021-02-12
Anticipated expiration: 2030-07-29

Abstract

The utility model discloses a commercial car atmospheric pressure integrated form electron parking system belongs to vehicle brake control technical field, including compressed gas jar (10), two logical gas control valves (2), relay valve (4), choke valve (9), electrical unit (7), pressure sensor (8), spring brake chamber (6), silencer (5), manual air inlet and outlet (11), two logical solenoid valve (1), two three way solenoid valve (3), have simple structure, the controllability is good, the high characteristics of security.

Description

Pneumatic integrated electronic parking system for commercial vehicle

Technical Field

The utility model relates to a vehicle brake control technical field especially relates to commercial car atmospheric pressure integrated form electron parking system.

Background

With the development of automatic driving and intelligent braking technologies, electronic parking from traditional manual parking to electronic parking has become an inevitable trend in the development of braking technologies. Besides the traditional hand brake function, the electronic parking system also has the functions of hill start assistance, dynamic braking, slope slipping prevention and the like, so that the electronic parking system also puts higher requirements on the function and the performance of the parking control valve. Compared with the common application on passenger vehicles, the application of electronic parking in the field of commercial vehicles is still in a starting stage due to the limitation of functions and performances of a parking control valve, and particularly the application of electronic parking in a pneumatic brake system is realized.

Aiming at the electronic parking technology of a pneumatic brake system, a pneumatic control valve applied to an industrial system is generally adopted at present, only partial electronic parking function can be realized, and the environmental applicability is general. For example, in the invention patent application (patent application No. CN201710118935.3, 6/13/2017), three two-position two-way electromagnetic valves are adopted to realize electronic parking, so that the control difficulty and the element cost are increased, and the reliability of the system is reduced; the invention patent (patent No. CN201310025781.5, published 2013, 5.8.A) adopts a pneumatic pilot type two-position three-way electromagnetic valve to realize the EPB function, because the valve adopts double electric controls, the state maintaining function can be realized, the reliability is improved, but because the working environment of the vehicle is bad, especially when the humidity is large and the temperature is low, because the valve core adopts a slide valve structure, the valve core is easy to be blocked due to dewing in a low-temperature environment, thereby reducing the reliability of the system; the patent (patent number CN201621419439.9, published 2017, 7 and 21) adopts a two-position three-way valve and a two-position two-way valve combination, and the system can cause vehicle sliding accidents if two-position two-way solenoid valves leak during parking. The invention patent application (patent application No. CN201810473063.7, published 2018, 9/7) discloses a pneumatic electronic parking system, which includes an electronic control unit, a parking brake module and a trailer module, which are independent of each other and can be connected to each other through a design interface or an external wire/pipe. However, in the technical scheme adopted for realizing the vehicle braking and releasing functions, the three electromagnetic valves and the pneumatic control valve are arranged, so that the structure is complex, the failure nodes generated by the failure nodes are multiplied, the vehicle maintenance cost is further increased after subsequent batch loading, and the economical efficiency is poor. In addition, the linkage operation of the three electromagnetic valves and the pneumatic control valve is needed when the automobile is braked or parked, so that the braking time is overlong due to different response times among the three electromagnetic valves, and the accident risk is increased.

The following problems are found through the analysis of the existing pneumatic electronic parking technology:

(1) when the industrial dual-electric-control two-position three-way electromagnetic valve is directly applied to the control of a pneumatic braking system, due to the problem of response time delay, high-speed charging and discharging is difficult to realize, and the dynamic parking requirement cannot be met;

(2) the plunger type valve core is easy to freeze due to dewing in a low-temperature environment, so that the valve core is stuck, a system fails and the environmental applicability is poor;

(3) when the two-position two-way electromagnetic valve is suddenly powered off during driving, the system is difficult to maintain the current state, and accidents can be caused by sudden braking;

(4) during parking, if the electromagnetic valve leaks, pressure can be accumulated to slide, and therefore reliability and safety of the system are reduced.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a commercial car atmospheric pressure integrated form electron parking system that simple structure, controllability are good, the security is high realizes the utility model discloses a technical solution does:

a commercial vehicle air pressure integrated electronic parking system comprises a compressed air tank 10, a two-position two-way air control valve 2, a relay valve 4, a throttle valve 9, an electronic control unit 7, a pressure sensor 8, a spring brake air chamber 6, a silencer 5, a manual air inlet and outlet 11, a two-position two-way electromagnetic valve 1 and a two-position three-way electromagnetic valve 3, wherein a second output interface 1b of the two-position two-way electromagnetic valve 1 is connected with an input port 4d of a control cavity of the relay valve 4, and a second output interface 1b of the two-position two-way electromagnetic valve is connected with a pneumatic control port of the two-position two-; a first output interface A of the two-position three-way electromagnetic valve 3 is connected with an input port 4d of a control cavity of the relay valve 4, an air supply port P of the two-position three-way electromagnetic valve is connected with a third output interface 2b of the two-position two-way electromagnetic valve 2, and an exhaust port R of the two-position two-way electromagnetic valve is connected with an input port of the muffler 5; the two-position two-way electromagnetic valve 1, the two-position three-way electromagnetic valve 3 and the pressure sensor 8 are connected with the electric control unit 7, the two-position two-way electromagnetic valve 1 and the two-position three-way electromagnetic valve 3 are both normally closed electromagnetic valves, the pressure sensor 8 is connected with the spring brake air chamber 6, and the pressure of the spring brake air chamber 6 is monitored and fed back to the system control unit.

Compared with the prior art, the utility model discloses the main advantage of content does:

1) the safety is high: when the system is suddenly powered off during driving, the pneumatic control electromagnetic valve can keep the current state under the control of air pressure, so that the sudden switching of the braking state can be avoided, and the driving safety is guaranteed; when the vehicle is parked, if the two-position two-way electromagnetic valve leaks, the leaked compressed air can enter the exhaust port 4b of the relay valve through the throttle valve 9, and the vehicle cannot slide due to pressure accumulation.

2) The controllability is good: the system adopts two direct-acting high-speed switch valves, and can accurately increase and reduce pressure and maintain pressure by using the high-speed switch valves, thereby realizing the high-grade braking functions of emergency dynamic parking, anti-lock and the like; and because the high-speed switch valve is the cone valve structure, the system has better low temperature suitability.

3) Having a secure backup: the design has manual operation mechanism, when the system outage can't drive, the accessible is operated manual button and is carried out the parking to guarantee the security of vehicle, also can conveniently carry out the maintenance.

4) The durability is good: through the optimized design of the air circuit, the electromagnetic valve is prevented from being electrified for a long time in the driving process, the coil loss can be reduced, the energy is saved, and the service life of the system is prolonged.

Drawings

Fig. 1 is a structural diagram of an integrated electronic parking system of the present invention;

fig. 2 is a diagram of the integrated electronic parking system according to the present invention;

fig. 3 is a parking state diagram of the integrated electronic parking system of the present invention;

in the figure, 1-two-position two-way electromagnetic valve, 2-two-position two-way air control valve, 3-two-position three-way electromagnetic valve, 4-relay valve, 5-muffler, 6-spring brake chamber, 7-Electronic Control Unit (ECU), 8-pressure sensor, 9-throttle valve, 10-air storage tank and 11-manual exhaust port.

Detailed Description

The present disclosure is described in detail below with reference to the attached drawings.

The utility model provides a commercial car electronic parking system, which is shown in fig. 1, and comprises a compressed air tank 10 for providing a compressed air source, wherein an air source interface of the compressed air tank is connected with an input interface 1a of a two-position two-way electromagnetic valve 1, and is simultaneously connected with an input interface 2a of a two-position two-way air control valve 2 and an input interface 4a of a relay valve 4; the electromagnetic valve 1 is a two-position two-way normally closed electromagnetic valve, an output interface of the electromagnetic valve is connected with an input port 4d of a control cavity of the relay valve 4, and a second output interface 1b of the electromagnetic valve is connected with a pneumatic control port of the two-position two-way air control valve 2; a first output interface A of the two-position three-way electromagnetic valve 3 is connected with an input port 4d of a control cavity of the relay valve 4, an air supply port P of the two-position three-way electromagnetic valve is connected with a third output interface 2b of the two-position two-way electromagnetic valve 2, and an exhaust port R of the two-position two-way electromagnetic valve is connected with an input port of the muffler 5; the interface 4c of the relay valve 4 is connected with the brake air chamber 6; the throttle valve 9 is respectively connected with a control port 4d and an output port 4c of the relay valve; 11 is a manual air inlet and outlet. The electric part is characterized in that the two-position two-way electromagnetic valve 1, the two-position three-way electromagnetic valve 3 and the pressure sensor 8 are connected with the electric control unit 7; the pressure sensor 8 monitors the pressure of the spring brake air chamber 6 and feeds the pressure back to the system control unit to provide a basis for pressure detection and fault diagnosis of the brake control module; the ECU serves as a system control unit that recognizes the different braking intents and performs the corresponding braking action.

The pressure of the pilot cavity of the relay valve is controlled by using the two-position two-way electromagnetic valve and the two-position three-way electromagnetic valve, the pressure can be quickly adjusted under emergency working conditions, and high-grade functions such as dynamic braking, anti-locking and the like can be realized. The two-position two-way air control valve is used for releasing parking and keeping the state, so that the condition that the driving state is suddenly switched due to sudden loss of the pressure of a control cavity under the condition of system power failure can be avoided, and the safety of the system is improved. In the system, the two-position two-way solenoid valve is electrified only when the parking action is released, and the two-position three-way solenoid valve is electrified only when the parking action is released, so that the direct-acting solenoid valve is prevented from being electrified for a long time, and the service life of elements can be effectively prolonged. The pressure sensor is used for monitoring the pressure of the brake air chamber, whether the electromagnetic valve works normally can be judged, and therefore the electromagnetic valve fault diagnosis function is achieved.

Initially, the system is in the state shown in fig. 1, the two-position two-way solenoid valve 1, the two-position three-way solenoid valve 3 are not powered on, the port a and the port P of the two-position three-way solenoid valve 3 are communicated, and since the control chamber of the relay valve 4 has no pressure, the relay valve 4 is also in the exhaust state, there is no pressure in the spring brake chamber, and the system is in the parking state (as shown in fig. 1).

1) When the electronic parking system receives a parking releasing instruction, the two-position two-way solenoid valve 1 is powered on and switched from a closed state to an open state, compressed air passes through the two-position two-way solenoid valve 1 to enable the pressure of a control cavity of the relay valve 4 to rise, a main valve of the relay valve 4 is opened, the compressed air enters from an interface 4a of the relay valve 4 and then enters into the spring brake air chamber 6 through an interface 4c, meanwhile, the pressure in a control cavity of the relay valve rises to enable the state of the two-position two-way solenoid valve 2 to change, the closed state is switched to the open state, then the two-position two-way solenoid valve 1 is powered off, the two-position two-way solenoid valve 2 is continuously maintained in the open state, and the compressed air is continuously input, so that the main valve of the relay valve 4. Under the action of compressed air, the push rod of the spring brake air chamber 6 retracts, and the parking brake is released (as shown in figure 2).

2) When a vehicle needs to enter a braking state from a driving state in a parking mode, the two-position three-way electromagnetic valve 3 is electrified for 200ms, the port R is connected with the port A, gas in a control cavity of the relay valve 4 flows out through the port R of the two-position three-way electromagnetic valve 3 and is released through the silencer 5 finally, the pressure of the control cavity of the relay valve 4 is reduced, an exhaust valve of the relay valve 4 is opened, compressed gas in the spring brake air chamber 6 flows out through an exhaust port 4b of the relay valve 4 and is released through the silencer 5 finally, and therefore a push rod of the spring brake air chamber 6 is pushed out under the action of spring force to implement braking. (see fig. 3) at this point, the two-position two-way pilot valve 2 will also return to its original state (see fig. 1) under the influence of the spring force, due to the drop in control chamber pressure of the relay valve 4.

3) In the normal driving and running process, compressed air is input into the control cavity of the relay valve 4 all the time, so the main valve of the relay valve 4 is kept open all the time, the push rod of the spring brake air chamber 6 is kept in a retraction state, and the two-position two-way electromagnetic valve 1 and the two-position three-way electromagnetic valve 3 are not required to be powered on at the moment, so when the electronic parking system is in a power failure state, the compressed air in the spring brake air chamber 6 cannot be suddenly released, namely, the driving state of a vehicle cannot be suddenly switched, and the driving safety is effectively guaranteed.

4) When a vehicle stops on a slope, if the valve 1 leaks, compressed air enters a control cavity of the relay valve through the air inlet, the relay valve is opened by the accumulation of the compressed air, and the compressed air enters the spring brake air chamber through a main valve of the relay valve, so that the slope slipping occurs. However, in the system, the leaked gas flows into the exhaust port 4b of the relay valve through the throttle valve 9 and is finally exhausted to the atmosphere through the muffler, so that the pressure accumulation of the control cavity of the relay valve 4 is avoided, the problem of vehicle sliding caused by gas leakage can be prevented, and the safety of the system is improved.

5) The dynamic parking is carried out in the system, the two-position two-way electromagnetic valve 1 and the two-position three-way electromagnetic valve 3 both adopt direct-acting high-speed switch valves, and the high-speed switch valves can accurately control the brake pressure. When the vehicle encounters an emergency condition, such as failure of service braking, a driver can turn on the electronic parking brake switch to trigger a dynamic parking function, the system can dynamically adjust the braking force, the wheels are prevented from being locked while certain braking strength is ensured, and the braking safety is improved.

6) The safe backup can be realized by manually operating a button when the electronic parking system is powered off and other faults cause the system not to normally operate. In the driving process, when the parking operation is required, only the manual operation button needs to be turned on, the gas in the control cavity of the relay valve 4 is discharged through the manual air inlet and outlet 11, the exhaust valve of the relay valve 4 is opened, the compressed gas in the spring brake air chamber 6 flows out through the interface 4b of the relay valve 4 and is finally released through the silencer 5, and therefore the push rod of the spring brake air chamber 6 is pushed out under the action of the spring force to implement braking.

When the device normally works, the system can be inflated or exhausted through the combined action of the valves, so that a vehicle is parked or the parking is released, the long-time electrification of the system can be avoided by applying the pneumatic control valve, and the service life of elements and the reliability of the system are effectively prolonged; when power failure occurs, the system can maintain the current state, and the sudden braking of the whole vehicle due to the system power failure is prevented; when the vehicle is parked, if the vehicle is parked on a ramp, the system can effectively prevent pressure from accumulating through the throttle valve, and the vehicle sliding accident is avoided; because the main loop adopts the high-speed switch valve, the system response is fast, can satisfy quick gassing demand when emergent braking, avoids rear wheel locking, reduces the risk of drifting away, improves vehicle braking stability.

Claims

1. The utility model provides a commercial car atmospheric pressure integrated form electron parking system, includes compressed gas jar (10), two logical gas accuse valves (2), relay valve (4), choke valve (9), electrical unit (7), pressure sensor (8), spring brake chamber (6), silencer (5), manual air inlet and outlet (11), its characterized in that: the two-position two-way electromagnetic valve (1) and the two-position three-way electromagnetic valve (3) are further included, a second output interface (1b) of the two-position two-way electromagnetic valve (1) is connected with a control cavity input port (4d) of the relay valve (4), and the second output interface (1b) is connected with a pneumatic control port of the two-position two-way pneumatic control valve (2); a first output interface (A) of the two-position three-way electromagnetic valve (3) is connected with an input port (4d) of a control cavity of the relay valve (4), a gas supply port (P) is connected with a third output interface (2b) of the two-position two-way pneumatic control valve (2), and a gas exhaust port (R) is connected with an input port of the muffler (5); the two-position two-way electromagnetic valve (1), the two-position three-way electromagnetic valve (3) and the pressure sensor (8) are respectively connected with the electric control unit (7).

2. The pneumatic integrated electronic parking system for commercial vehicles according to claim 1, characterized in that: the two-position two-way electromagnetic valve (1) and the two-position three-way electromagnetic valve (3) are normally closed electromagnetic valves.

3. Pneumatic integrated electronic parking system for commercial vehicles according to claim 1 or 2, characterized in that: the pressure sensor (8) is connected with the spring brake air chamber (6).