Parking Brake Force Control to Prevent Wheel Locking
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Solution Overview
Problem
Conventional brake systems fail to maintain running stability during parking brake application due to the lack of control over braking force based on vehicle speed, leading to potential wheel locking.
Innovation Solution
A brake system that includes a service brake and a parking brake, with a hardware processor controlling the first and second braking forces according to vehicle speed, and a feedforward control apparatus adjusting the parking brake force to maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the parking brake is operated to decelerate and stop the vehicle when service brake fails, then the braking function is restored, but the wheels may lock causing deterioration of running stability
Solution Approach 1:
The parking brake control device dynamically adjusts the braking force based on real-time vehicle speed detection. When vehicle speed exceeds a predetermined threshold during parking brake application, the control device reduces the braking force to prevent wheel locking, thereby maintaining running stability while ensuring braking function reliability
Solution Approach 2:
The system implements feedback control by continuously monitoring vehicle speed and adjusting parking brake force accordingly. The control device receives vehicle speed information, compares it with threshold values, and modifies braking force in real-time to prevent wheel locking while maintaining effective braking, thus resolving the contradiction between braking reliability and running stability
2Force
If the parking brake applies force without vehicle speed control, then the braking force is sufficient to stop the vehicle, but the wheels lock and running stability deteriorates
Solution Approach 1:
The parking brake control device transforms the static braking force application into a dynamic process by continuously adjusting braking force according to vehicle speed. At higher speeds, braking force is reduced to prevent wheel locking, while at lower speeds it is maintained or increased to ensure effective stopping, thus maintaining both sufficient braking force and running stability
Solution Approach 2:
The system changes the braking force parameter based on vehicle speed parameter. When vehicle speed exceeds the threshold, the control device reduces braking force to prevent wheel locking; when speed is below the threshold, full braking force is applied. This parameter adjustment resolves the contradiction between maintaining sufficient braking force and preventing wheel locking to preserve running stability
Data Source
AI summary
Provided is a brake system capable of improving the running stability during parking brake application, the brake system including: a service brake capable of generating a first braking force on a vehicle; and a parking brake capable of generating a second braking force on the vehicle. The brake system includes a hardware processor that controls the first braking force according to the vehicle speed of the vehicle and controls the second braking force according to the vehicle speed.