Transmission Shift Control During ABS Braking to Prevent Gear Noise
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
During anti-lock braking operations, excessive changes in wheel speed can lead to damage and unpleasant noises due to asynchronous engagement of shifting elements in vehicle transmissions, as existing systems fail to prevent form-fitting interactions during critical speed changes.
Innovation Solution
A method that involves an electronic control unit monitoring wheel speed changes and preventing the movement of a shifting element from a decoupled to a coupled position if the speed change exceeds a threshold, thereby avoiding form-fitting interaction and potential damage or noise during anti-lock braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the shifting element is allowed to move into coupled position during anti-lock braking, then gear change functionality is maintained, but damage and noise occur due to asynchronous engagement
Solution Approach 1:
The control unit checks the wheel speed change rate before allowing the shifting element to move into the coupled position. By performing this preliminary check and preventing engagement when the change rate exceeds the threshold, the system avoids asynchronous engagement damage and noise while maintaining gear change functionality under normal conditions.
2Object-affected harmful factors
If the shifting element movement is prevented during anti-lock braking, then damage and noise are avoided, but gear change capability is reduced
Solution Approach 1:
The system dynamically adjusts the shifting element movement based on real-time wheel speed change rate conditions. When the change rate is below the threshold, gear changes are permitted; when it exceeds the threshold during anti-lock braking, movement is prevented. This dynamic adaptation resolves the contradiction by allowing gear change capability under safe conditions while preventing damage under critical conditions.
Data Source
AI summary
A method for operating a vehicle having a transmission and a braking device during a journey, during which the vehicle, the transmission of which comprises at least one form-fitting shifting element, moves along a roadway, wherein during the journey of the motor vehicle, its shifting element is movable into formfitting interaction with at least one further component, an anti-lock braking operation is carried out by the braking device, in which at least one braking torque to be applied by the braking device to at least one wheel of the vehicle for braking the wheel is limited at least temporarily to a specifiable value by a regulating device of the vehicle in order to thereby at least temporarily prevent the wheel from locking relative to the roadway.