Electronic parking system based on air pressure redundancy

Abstract

The invention discloses an electronic parking system based on air pressure redundancy and belongs to the technical field of intermediate-heavy type truck parking brake systems. The electronic parking system comprises an ECU, an air storage cylinder for parking braking, a parking manual valve, a parking relay valve and a spring braking cylinder. The ECU is electrically connected with an EPB self-reset switch, an HAS self-reset switch, an electronic parking memory valve and a pneumatic and manual alarm switch; the air storage cylinder for parking braking is in air channel connection with an air inlet of the parking manual valve and an air inlet of the parking relay valve; an air inlet of the electronic parking memory valve is connected with the parking manual valve; an air outlet of the electronic parking memory valve is connected with the parking relay valve; and the parking relay valve is in air channel connection with the pneumatic and manual alarm switch and the spring braking cylinder. The electronic parking system is used for air braking system vehicles which adopt springs to store energy to implement parking braking, the comfort and reliability of electronic parking can be provided, under the condition of circuit failure, parking braking and emergency braking can also be air-controlled, and meanwhile the ramp starting auxiliary function can further be achieved.

Description

technical field [0001] The invention belongs to the technical field of parking brake systems for medium and heavy trucks, and in particular relates to an electronic parking system based on air pressure redundancy. Background technique [0002] At present, electronic parking systems have begun to be popularized on passenger cars, but for medium and heavy trucks that use energy storage spring brakes, the solution of manual valve + parking relay valve is generally used. With the advent of the Internet era, truck drivers have higher and higher requirements for vehicle comfort, and the pneumatic electronic parking system has emerged as the times require. [0003] Patent Document 1 (CN105905087A) discloses a pneumatic electronic parking system with emergency braking, including a parking brake controller electrically connected to the rear service brake unit, and also includes a The controller is electrically connected to the electronic control switch, the left wheel speed sensor a...

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Problems solved by technology

[0006] The electronic parking systems disclosed in Patent Document 1, Patent Document 2 and Patent Document 3 all have their inherent deficiencies to varying degrees. Patent Document 1 uses a normally closed solenoid valve to control inflation to release parking. There is a leak, once the air pressure in the spring chamber is reduced enough to overcome the spring force, the brake will automatically apply the parking brake, especially when in a partial braking state, the brake will drag, and before the vehicle misfires due to overheating , it is generally difficult for the driver to find out, so there is a potential safety hazard; Patent Document 2 uses a cable for parking braking, which is generally only used for small-tonnage passenger cars. Large, requires large power of the motor, large movement distance of the cable, large force, low reliability, and is not suitable for commercial vehicles; Patent Document 3 In the process of driving, the solenoid valve needs to be energized for a long time to keep the parking brake at When the state is released, once the circuit fails, the vehicle will automatically implement the parking brake. According to the requirements of GB12676 regulations, automatic parking without the driver's will cannot occur. At the same time, the parking brake of medium and heavy vehicles is only applied to the middle and rear axles. In this case, the driving vehicle will be out of control, such as flicking, and there is a great potential safety hazard

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