Brake Device Directional Control Valve Pressure Holding
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Solution Overview
Problem
Existing brake devices with ABS pressure control valves can only maintain brake pressure for a limited time and are not suitable for increasing pressure, requiring additional modifications and components for effective pressure-holding functions.
Innovation Solution
A brake device incorporating a service brake valve, directional control valve, and check valve to ensure a reliable and inexpensive pressure-holding function, allowing for constant or increased brake pressure without rapid decay, using a single directional control valve and check valve integrated into the existing brake system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ABS pressure control valves are used for pressure holding, then the system can maintain brake pressure for a limited time, but the pressure rapidly decreases and additional modifications are required for effective pressure holding
Solution Approach 1:
The pressure holding function is segmented into two distinct valve components: a directional control valve for routing fluid flow and a check valve for maintaining pressure. This segmentation allows each valve to perform its specialized function effectively, with the check valve providing reliable one-way flow control to maintain pressure without the limitations of ABS pressure control valves.
Solution Approach 2:
The directional control valve serves multiple functions: it routes fluid flow during normal braking operations and switches to enable the check valve's pressure holding function when activated. This multi-functionality eliminates the need for separate dedicated pressure holding valves, reducing system complexity while maintaining effective pressure holding capability.
2Device complexity
If ABS pressure control valves are used, then the existing brake system can be utilized, but the valves are not suitable for increasing pressure and require additional pressure lines and multiple valves
Solution Approach 1:
The directional control valve is designed to handle both normal braking operations and pressure holding functions, serving multiple purposes within the system. This multi-functionality allows the brake system to maintain pressure and even increase pressure without requiring additional dedicated valves or pressure lines, thereby maintaining low device complexity while achieving high adaptability.
Solution Approach 2:
The directional control valve acts as an intermediary component that switches between two functional modes: routing fluid through the normal braking path and routing fluid through the check valve for pressure holding. This intermediary function enables the system to achieve versatile pressure control without adding complex additional components.
3Duration of action of moving object
If check valve blocking action is used for pressure holding, then pressure can be held over a long period, but additional valve components must be installed
Solution Approach 1:
The pressure holding function is achieved by segmenting the valve system into a directional control valve for flow management and a check valve for pressure maintenance. This segmentation allows the check valve to provide reliable long-duration pressure holding while the directional control valve manages the switching logic, achieving extended pressure holding without requiring multiple dedicated pressure holding valves.
Solution Approach 2:
The directional control valve serves as a multi-functional component that both controls normal braking operations and enables the check valve's pressure holding function. By consolidating control functions in a single valve, the system achieves long-duration pressure holding with minimal additional components.
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
The solution provides a reliable and cost-effective pressure-holding function that can maintain brake pressure over a long period, allowing for increased braking force without additional valve switching, ensuring safe and efficient vehicle stopping and starting.
Implementation Method 1
the check valve exhibits a significantly better blocking action in the blocking direction than ABS valves that have conventionally been used for the pressure-holding action
Implementation Method 2
the pressure connection has at least a directional control valve and a check valve
Implementation Method 3
the service brake valve generates, in response to an actuation of an operating means, an actuation-dependent pressure at at least one service brake valve outlet
Data Source
AI summary
A brake device (10) includes a service brake valve (16) that produces an actuation-dependent pressure at a service brake valve outlet (20) when an operating means (18) is actuated. The brake device (10) includes a brake actuator (40) with a brake actuator inlet (39). The service brake valve outlet (20) is connected to the brake actuator inlet (39) via a pressure connection (14). The pressure connection (14) includes a directional control valve (24) and a check valve (30). The check valve (30) is bypassed in a first valve position of the directional control valve (24) to allow a fluid flow from the brake actuator inlet (39) to the service brake valve outlet (20) and a fluid flow through the check valve (30) from the brake actuator inlet (39) to the service brake valve outlet (20) is largely prevented in a second valve position of the directional control valve (24).