Parking Brake Relay Valve with Select-High Trailer Control
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Solution Overview
Problem
Existing parking brake devices for motor vehicles, particularly those with trailers, face challenges in simplifying the construction and easily applying pressure to trailer control modules, especially during parking, and require independent control for stretch and trailer test functions to avoid braking the motor vehicle and trailer simultaneously.
Innovation Solution
A parking brake device with a control valve device, relay valve, pneumatic brake device, and trailer control module, where the relay valve is controlled by the control valve device, and a select-high valve is used to adjust compressed air supply to the trailer control module, allowing independent control of the trailer module and preventing simultaneous braking of the motor vehicle and trailer through an exhaust air valve with adjustable opening pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a supply line to the trailer control module branches off downstream of the relay valve, then pressure transmission to the trailer is simplified, but the motor vehicle may be braked simultaneously with the trailer during parking brake operation
Solution Approach 1:
The system is divided into two independent control paths: one for the motor vehicle (through the relay valve) and one for the trailer control module (through the select-high valve). This segmentation allows independent operation of each braking system, enabling the trailer to be braked separately from the motor vehicle during parking brake operation.
Solution Approach 2:
The select-high valve acts as an intermediary between the compressed air source and the trailer control module. It selectively directs compressed air to the trailer based on control signals, enabling independent trailer braking without affecting the motor vehicle's brake system.
2Ease of operation
If the exhaust valve has adjustable opening pressure, then graduated braking control is enabled, but valve complexity increases
Solution Approach 1:
The exhaust valve incorporates an adjustable opening pressure parameter that can be modified to achieve different braking force levels. By changing the pressure threshold at which the valve opens, the system can provide graduated braking control from mild to strong braking without adding complex mechanical structures.
3Adaptability or versatility
If the first select-high valve is used to control compressed air supply to the trailer, then independent trailer control is achieved, but the number of valves in the system increases
Solution Approach 1:
The select-high valve is designed to perform multiple functions: it controls compressed air supply to the trailer control module, enables independent trailer braking, and provides graduated braking control through its adjustable opening pressure. This multi-functionality reduces the need for additional specialized components.
Solution Approach 2:
The exhaust valve is designed as a self-regulating component that automatically opens at its adjustable pressure threshold without requiring external control signals. This self-service capability simplifies the control system by eliminating the need for additional actuators or control valves.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables safe and reliable operation by allowing independent control of the trailer module, preventing the jack-knife effect, and facilitating graduated braking, while maintaining cost advantages through a simple mechanical design with minimal hysteresis.
Implementation Method 1
for parking braking the spring compression chamber is vented, i.e. connected to atmospheric pressure, so that the brake cylinder generates a braking force under the action of the spring
Implementation Method 2
at least one supply line to the trailer control module branches off downstream of the relay valve
Data Source
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AI summary
The present invention relates to a parking brake device (1) for motor vehicles, comprising at least one control valve device (20), at least one relay valve (36), at least one pneumatic braking device (42) and at least one trailer control module (46), wherein the control valve device (20) and the relay valve (36) are connected to each other by means of a connecting line and wherein the relay valve (36) is controllable by means of the control valve device (20), wherein at least the pneumatic braking device (42) is controllable by means of the relay valve (36). According to the invention, at least one feed line (40", 50) to the trailer control module (46) branches off downstream of the relay valve (36) and a first select-high valve (52) is provided upstream of the trailer control module, a first inlet (52a) of the first select-high valve (52) being connected to the feed line (40", 50) to the trailer control module (46) and a second inlet (52b) of the first select-high valve (52) being connected to a feed line (22"), in which an outgoing air valve (54) is arranged, by which the compressed air fed via the feed line (22") can be adjusted.