Electro-pneumatic parking brake

Abstract

An electro-pneumatic parking brake arrangement, comprises a 3 / 2 pneumatically controlled valve (3) having a fluid connection from an output port (3.3) to a control port (3.4) for defining the valve switching position by the output pressure and providing control pressure for a relay valve (5) setting up a parking brake pressure in a springbrake chamber of a brake cylinder (8) through an output port (B) of the relay valve (5), wherein a variable pressure level which is feeding an inlet port (3.1) of the pneumatically controlled valve (3) is provided by two 3 / 2 magnet valves (1, 2), further comprising: - a fluid connection to the parking brake pressure supply input (A) provided through the parking brake check valve (7) by inlet port (1.2) of load magnet valve (1), and - a fluid connection to the ambient pressure provided by exhaust port (2.2) of the exhaust magnet valve (2), and - a fluid connection from an outlet port (1.3) of load magnet valve (1) to an inlet port (2.1) of the exhaust valve (2) and the inlet port (3.1) of the pneumatically controlled valve (3), and - a fluid connection from an outlet port (2.3) of the exhaust valve (2) to an inlet port (1.1) of the load valve (1).

Description

technical field [0001] The invention relates to an electro-pneumatic parking brake device comprising a 3 / 2 pneumatic control valve having a fluid connection from an output port to a control port for defining The valve switches positions and provides control pressure for the relay valve, thereby setting the parking brake pressure in the spring brake chamber of the brake cylinder via the output port of the relay valve. [0002] Electronic solutions for controlling the parking brake of commercial vehicles are a new trend in the development of vehicle systems. Although the working mechanism is intended only for the passenger car market, some technical solutions for electro-pneumatic parking brakes have been described in the technical literature as described below. Background technique [0003] In parking brake systems, the main requirement is to maintain a so-called safe state, ie parked or released, even in the event of a failure. This bistable feature must be combined with p...

AI Technical Summary

Problems solved by technology

[0007] Existing solutions mainly provide stability control through expensive and not durable solutions

Some solutions are more efficient, but require very complex and precise control to be able to provide stability, or work with additional constraints to be able to keep the system in the desired operating mode

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