Hydraulic Brake Inlet Valve Throttling for Overpressure Control
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Solution Overview
Problem
Existing hydraulic vehicle brake systems with external power pressure generators face challenges in preventing excessive brake pressure that can damage the system, particularly during external power braking, where mechanical overloading or destruction may occur due to uncontrolled pressure increases.
Innovation Solution
The method involves partially closing the inlet valve of a wheel brake whose outlet valve is open, allowing the brake pressure to be regulated and limited, thereby preventing excessive pressure increases and ensuring the brake pressure remains within a safe range by using continuous valves that can be partially opened or closed to act as throttles, and ensuring the external power pressure generator is switched off to prevent further pressure buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the external pressure generator is switched off to prevent overpressure, then pressure increase is prevented, but brake pressure control is lost
Solution Approach 1:
The inlet valve acts as an intermediary component between the pressure generator and the wheel brake. By partially closing the inlet valve, it mediates the pressure transmission, allowing pressure control to be maintained even when the external pressure generator is switched off. The valve throttles the brake fluid flow, preventing overpressure while preserving some level of pressure control.
2Stress or pressure
If the outlet valve is opened to release pressure, then excessive pressure is prevented, but braking effectiveness is reduced
Solution Approach 1:
Instead of completely opening the outlet valve to release pressure, the system applies partial action by partially closing the inlet valve. This allows sufficient brake pressure to be maintained for effective braking while preventing excessive pressure buildup. The partial closure provides just enough throttling to control pressure without completely blocking the pressure transmission path.
3Stress or pressure
If the inlet valve is completely closed to prevent pressure increase, then pressure is limited, but brake pressure generation is blocked
Solution Approach 1:
The inlet valve is partially closed rather than completely closed, maintaining an opening that allows brake pressure generation to continue while limiting excessive pressure increase. This partial closure provides the right balance between pressure limitation and power transmission.
Solution Approach 2:
The system uses hydraulic principles by controlling brake fluid flow through the partially closed inlet valve. The valve acts as a hydraulic throttle, regulating the flow of brake fluid to the wheel brake, thereby controlling pressure buildup while maintaining sufficient pressure generation capability.
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 approach effectively limits and stabilizes brake pressure, preventing damage to the vehicle brake system by controlling pressure increases and maintaining desired brake pressure levels, even when the external power pressure generator slows down or stops, thus protecting the system from overloading and destruction.
Implementation Method 1
partially closing an inlet valve (10) of a wheel brake (9), whose outlet valve (11) is open or is already open
Data Source
AI summary
According to the invention, in order to prevent an exceedance of a permissible maximum pressure in a hydraulic externally powered vehicle braking system (1) with slip control, continuously variable valves are to be used as inlet valves (10) of wheel brakes (9) of the vehicle braking system (1), and the inlet valve (10) of a wheel brake (9) - the outlet valve (11) of which is opened to control the wheel brake pressure - is to be partially closed, such that this inlet valve (10) acts as a throttle and limits a brake pressure in the vehicle braking system (1).