Brake Fluid Pressure Control via Alternating Valve Maps
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Solution Overview
Problem
Conventional vehicle brake fluid pressure control systems using proportional electromagnetic valves face challenges in achieving accurate fluid pressure reduction when the valve closing and opening properties differ significantly, leading to potential fluid pressure deviations from target values.
Innovation Solution
A vehicle brake fluid pressure control apparatus that includes a normally open electromagnetic pressure regulator valve and a control unit capable of alternating between valve closing and opening maps to control the current flowing to the valve, ensuring accurate fluid pressure reduction by switching between output current values for closing and opening operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a proportional electromagnetic valve is used with different valve opening and closing maps, then the valve can be controlled to open and close, but the actual fluid pressure reduction amount deviates from the target value when the valve closing property differs largely from the valve opening property
Solution Approach 1:
The control unit alternates between opening and closing control at predetermined intervals, switching between the valve opening map and valve closing map periodically. This periodic switching enables gradual fluid pressure reduction while compensating for the differences between valve opening and closing properties, preventing large deviations from target pressure values.
Solution Approach 2:
The control unit dynamically switches between two different control maps (valve opening map and valve closing map) based on the current operational state. By adapting the control strategy in real-time according to whether the valve is opening or closing, the system achieves more accurate fluid pressure control despite the inherent differences in valve properties.
2Adaptability or versatility
If the valve closing property differs largely from the valve opening property, then the valve construction and assembly may vary, but simple map switching causes fluid pressure reduction gradient to deviate from target
Solution Approach 1:
By implementing periodic switching between opening and closing control modes, the system gradually reduces fluid pressure while compensating for manufacturing variations in the valve. This approach allows the use of valves with different construction and assembly properties while maintaining accurate pressure reduction gradients.
3Ease of operation
If a normally open electromagnetic pressure regulator valve is used, then the valve can adjust differential pressure in accordance with current value, but alternating between closing and opening maps is required to achieve accurate pressure reduction
Solution Approach 1:
The control unit is designed to perform multiple functions: it stores both valve opening and closing maps, determines current valve state, switches between maps based on operational phase, and controls the electromagnetic valve. This multi-functional design consolidates the complexity into a single control unit while enabling accurate pressure reduction through alternating map usage.
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 allows for stable and accurate brake fluid pressure reduction, minimizing the impact of property differences in the valve's construction and assembly, and provides a stable braking experience during high-speed driving by precisely controlling fluid pressures within wheel brakes.
Implementation Method 1
a proportional electromagnetic valve (liner solenoid valve) which generates a valve closing force which is proportional to the magnitude of an electric current given
Data Source
AI summary
A vehicle brake fluid pressure control apparatus includes: a normally open electromagnetic valve which adjusts a differential pressure between an upstream side and a downstream side; and a control unit including a memory part which stores a valve closing map which shows a relationship between the differential pressure between the upstream side and the downstream side of the pressure regulator valve and an output current value for closing the pressure regulator valve and a valve opening map which shows a relationship between the differential pressure and an output current value for opening the pressure regulator valve, wherein when attempting to reduce a fluid pressures, the control unit executes a current value switching control which controls a current flowing to the pressure regulator valve by selecting alternately an output current value of the valve opening map and an output current value of the valve closing map.