Vehicle Brake Fluid Pressure Controller for Sudden Braking Stability
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Solution Overview
Problem
Existing vehicle brake fluid pressure controllers experience unstable operation during sudden braking due to sudden pressure fluctuations in the front wheels, leading to overshooting and instability in antilock brake control.
Innovation Solution
A vehicle brake fluid pressure controller using a normally-open proportional solenoid valve and a normally-closed solenoid valve, with a sudden braking judging module that fully closes the proportional solenoid valve during sudden braking to hold hydraulic pressure and then controls pressure increase at a predetermined inclination, stabilizing the operation by suppressing sudden pressure changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If pressure increase control is performed during sudden braking, then braking force is provided, but hydraulic pressure rises suddenly causing unstable operation and overshooting
Solution Approach 1:
The patent dynamically adjusts the pressure increase inclination based on wheel deceleration magnitude. During sudden braking with high deceleration, the system uses a gentle pressure increase inclination to prevent overshooting and instability. During normal braking with lower deceleration, the system uses a steep pressure increase inclination for responsive braking. This dynamic adaptation resolves the contradiction between providing sufficient braking force and maintaining operational stability.
Solution Approach 2:
The patent changes the pressure increase inclination parameter according to the magnitude of wheel deceleration. By monitoring wheel deceleration and selecting different pressure increase inclinations (gentle for sudden braking, steep for normal braking), the system optimizes both braking force delivery and operational stability, preventing the overshooting that occurs with fixed pressure increase rates.
2Speed
If a normally-open proportional solenoid valve is used for pressure increase control, then quick response is achieved, but sudden pressure fluctuations occur at the start of ABS control
Solution Approach 1:
The patent dynamically adjusts the pressure increase inclination based on detected wheel deceleration. During sudden braking, when stability is critical, the system uses a gentle pressure increase inclination even with a normally-open proportional solenoid valve, preventing overshooting while maintaining the valve's quick response capability for normal braking conditions.
3Ease of operation
If hydraulic pressure balance is adjusted by decreasing rear wheel hydraulic pressure, then rear wheel braking is optimized, but front wheel pressure fluctuations increase
Solution Approach 1:
The patent applies local quality by implementing different pressure control strategies for front and rear wheels based on their specific conditions. The system independently controls pressure increase inclination for each wheel according to its deceleration characteristics, allowing optimized braking balance while preventing pressure fluctuations in the front wheels through localized gentle pressure increase when needed.
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 effectively stabilizes the brake fluid pressure at the start of antilock brake control, reducing fluctuations and ensuring stable operation by securely holding and gradually increasing hydraulic pressure, thereby improving the control's accuracy and reliability during sudden braking.
Implementation Method 1
a normally-open proportional solenoid valve provided in a hydraulic passage extending from a hydraulic pressure source to a wheel brake
Implementation Method 2
a normally-closed solenoid valve provided in a hydraulic passage extending from the wheel brake to the hydraulic pressure source
Data Source
AI summary
Embodiments disclose a vehicle brake fluid pressure controller. The controller includes: a normally-open proportional solenoid valve provided in a hydraulic passage extending from a hydraulic pressure source to a wheel brake; a normally-closed solenoid valve provided in a hydraulic passage extending from the wheel brake to the hydraulic pressure source; an antilock brake control module configured to perform an antilock brake control for suppressing the locking of a wheel by performing a pressure increase control, a pressure decrease control and a pressure holding control for a hydraulic pressure of the wheel brake, using the normally-open proportional solenoid valve and the normally-closed solenoid valve.