Brake Valve Device for Traction-Slip Control and Halt Brake
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Solution Overview
Problem
The existing traction-slip controlled brake systems for commercial vehicles are complex and require additional components like pressure limiting devices, making them less efficient and more costly.
Innovation Solution
A simplified brake system design using a single 2/2 solenoid valve and a valve device, such as a 3/2 solenoid valve, that can be controlled to implement traction-slip control and generate predetermined brake pressures from a pressure medium reserve, allowing for dual functions like halt brake and hill holder without the need for a pressure limiting device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure limiting device and multiple solenoid valves are used to implement halt brake function, then the brake system can provide predetermined brake pressure, but the device complexity increases
Solution Approach 1:
The service-brake valve is designed to perform multiple functions: normal service braking, halt brake with predetermined pressure, and traction-slip control. The valve device with two operating positions enables the single valve to replace what would traditionally require multiple specialized valves and pressure limiting devices, thereby reducing system complexity while maintaining all necessary brake functions
Solution Approach 2:
The patent combines the halt brake function and traction-slip control function into the existing service-brake valve structure. By integrating these functions into a single valve with a valve device that has two operating positions, the system merges multiple previously separate components into one unified device, reducing the number of parts and simplifying the overall brake system
2Reliability
If a manually operable switch with constant pressure supply is used for halt brake, then the halt brake function is achieved, but the brake pressure becomes uncontrollable by the driver
Solution Approach 1:
The service-brake valve is designed with dynamic adaptability to handle different operating modes. The valve device can switch between two operating positions: one for normal driver-controlled service braking where pressure is controllable, and another for halt brake mode where predetermined pressure is supplied. This dynamic switching capability allows the system to adapt to different operational requirements without sacrificing driver control during normal braking
Solution Approach 2:
The valve device acts as an intermediary between the driver's brake input and the brake actuators. It can selectively connect different pressure sources (driver input or predetermined pressure from pressure medium reserve) to the brake actuators based on the operating mode, thereby mediating between the conflicting requirements of driver control and automated halt brake function
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
This design simplifies the brake system, reduces complexity and costs, while maintaining or adjusting brake pressures for various functions like traction-slip control, halt brake, and adaptive cruise control, ensuring efficient operation and reliability.
Implementation Method 1
at least one 2/2 solenoid valve (46), which, in accordance with a first operating position, establishes a direct or indirect connection from a pressure medium reserve (12)
Implementation Method 2
service-brake valve (4) which generates an actuation-dependent pressure at at least one outlet port
Implementation Method 3
an ASR valve for regulating traction slip is provided in a downstream pressure line
Data Source
AI summary
A control device for controlling a brake system of a vehicle comprises a first output for controlling a first solenoid valve; a second output for controlling a valve device; an input for receiving a requested brake pressure; and a port for receiving messages on a databus. The control device is capable of receiving an automatic brake request on the databus; determining a desired brake pressure in response to the automatic brake request; receiving a requested brake pressure in response to a driver actuating a service brake valve; comparing the desired brake pressure to the requested brake pressure; transmitting a control signal to close the first solenoid valve and transmitting a control signal to change the valve device to a first operating position in response to the requested brake pressure being less than the desired brake pressure in order to provide pressure to at least one brake actuator.