Vehicle Braking Control Using Reverse Gear on Slippery Roads
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Solution Overview
Problem
Current braking systems, including ABS and ESC, may increase braking distances on slippery roads, potentially leading to unsafe situations, especially when sudden obstacles are encountered and steering is not possible.
Innovation Solution
A braking control arrangement that detects slippery roads and shifts the vehicle into reverse mode during braking, and then back to forward mode when an unwanted steering trace is detected, using speed measurement data to facilitate gear shifts or motor mode changes, thereby reducing braking distances and improving traction control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ABS is activated during braking on slippery roads, then steering control is maintained, but braking distance increases significantly
Solution Approach 1:
The patent applies reverse gear engagement during braking on slippery surfaces, which is an inverted approach to the conventional forward motion. By engaging reverse gear, the system creates a counteracting torque that helps reduce braking distance while maintaining steering control through ABS. This unconventional use of reverse gear contradicts the normal forward driving mode but effectively solves the braking distance problem on slippery roads.
Solution Approach 2:
The system changes the operational parameters of the vehicle by engaging reverse gear, which alters the torque direction and magnitude applied to the wheels. This parameter change allows the braking system to operate more effectively on slippery surfaces by creating favorable friction conditions between the tires and road surface, thereby reducing braking distance while maintaining steering capability.
2Speed
If reverse gear is engaged during braking on slippery roads, then braking distance is reduced, but vehicle stability may be compromised
Solution Approach 1:
The patent incorporates feedback mechanisms that continuously monitor vehicle behavior during reverse gear engagement. When unwanted vehicle traces or steering wheel turns are detected, the system responds by disengaging reverse gear and returning to forward gear. This feedback loop ensures vehicle stability is maintained while benefiting from the reduced braking distance achieved through reverse gear engagement.
Solution Approach 2:
The system dynamically adjusts the gear engagement state based on real-time vehicle conditions. Reverse gear is engaged only when beneficial for reducing braking distance, and the system continuously monitors for signs of instability. When instability is detected through unwanted traces or steering inputs, the system dynamically switches back to forward gear, creating a flexible and adaptive braking control strategy.
Data Source
AI summary
A braking control arrangement is for a braking system of a vehicle. The braking system comprises an anti-lock braking system, ABS, and an electronic stability control, ESC. The braking control arrangement comprises a module that is arranged to operate with the anti-lock braking system and the electric stability control. The arrangement is also arranged to drive a gear arrangement of the vehicle in such a way that when braking the vehicle, the anti-lock braking system works, and a slippery road is detected, the gear arrangement of the vehicle is driven to shift a reverse gear.