Brake Control for Stable Downhill Starts From Standstill
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Solution Overview
Problem
Existing vehicle control systems fail to stabilize the starting process when a vehicle begins to go downhill from a stationary state, leading to potential slipping and safety risks.
Innovation Solution
A control method and brake system that dynamically adjust braking force based on the stroke of the brake pedal and the slope of the hill, using a pedal stroke sensor and brake actuator to maintain vehicle speed within a target range, incorporating a hill descent control function triggered by human or system instructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the driver releases the brake pedal when the vehicle starts to go downhill from a stationary state, then the vehicle can move forward, but the vehicle speed increases immediately causing the vehicle to surge forward and slip
Solution Approach 1:
The system performs preliminary action by detecting the downhill starting condition in advance and automatically applying a preliminary braking force before the driver releases the brake pedal. This preliminary braking force prevents the immediate surge forward when the pedal is released, ensuring stable vehicle starting while allowing normal forward movement.
2Stability of the object's composition
If the driver controls the brake pedal and throttle in an uphill scenario, then the vehicle can start stably, but the vehicle cannot start stably in a downhill scenario
Solution Approach 1:
The system implements dynamics by dynamically adjusting the braking force based on the detected scenario (uphill or downhill). The control unit determines whether the vehicle is in an uphill or downhill state and applies different braking strategies accordingly, enabling stable starting in both uphill and downhill scenarios while maintaining scenario-specific adaptability.
3Speed
If the vehicle applies braking force to control speed downhill, then the vehicle speed can be controlled, but the braking force needs to be dynamically adjusted based on hill slope
Solution Approach 1:
The system implements feedback by continuously detecting the hill slope using the acceleration sensor and adjusting the braking force accordingly. The control unit receives acceleration information, determines the hill slope, and dynamically adjusts the braking force to maintain proper vehicle speed control. This feedback mechanism enables adaptive speed control without requiring complex manual adjustments.
Data Source
AI summary
A control method and a brake system are provided. The method includes: when a vehicle moves downhill from a stationary state, obtaining a stroke of a brake pedal in the vehicle, and when the stroke of the brake pedal is greater than a first threshold, controlling the vehicle to brake with a first braking force, for a vehicle speed of the vehicle to be within a target vehicle speed range. In this way, when the vehicle starts to go downhill from the stationary state, a driver may control the vehicle speed of the vehicle by depressing the brake pedal, to effectively avoid a forward surge of the vehicle, and implement stable starting of the vehicle, so as to effectively improve safety of the vehicle.