Clutch Burst Prevention via ABS Speed Threshold Control
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Solution Overview
Problem
Conventional manual transmission systems are prone to clutch burst, where the clutch disc accelerates beyond its intended speed, leading to delamination and potential system failure, especially in four-wheel drive vehicles during low-speed off-road driving or steep hill conditions.
Innovation Solution
A control system that monitors vehicle operating parameters to determine a speed threshold for clutch burst prevention, using the anti-lock braking system to apply brakes when the vehicle approaches this threshold, thereby preventing clutch disc delamination by reducing speed and ensuring safe gear shifting without severely impacting drivability or safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the clutch disc is designed to operate at higher speeds to improve performance, then the vehicle speed range is extended, but the risk of clutch burst increases due to friction material delamination
Solution Approach 1:
The controller proactively determines a vehicle speed threshold based on operating parameters before clutch burst occurs. When the vehicle speed approaches this threshold, the anti-lock braking system is commanded to apply brakes in advance to prevent the clutch disc from exceeding its safe rotational speed, thereby avoiding friction material delamination while allowing extended speed operation
Solution Approach 2:
The system continuously monitors operating parameters (gear ratio, vehicle speed, axle ratios, wheel size) and uses this feedback to dynamically determine the vehicle speed threshold. This closed-loop feedback mechanism adjusts the safety threshold based on current transmission conditions, enabling the system to safely operate across an extended speed range while preventing clutch burst
2Duration of action of moving object
If the anti-lock braking system is used to reduce vehicle speed to prevent clutch burst, then clutch disc lifespan is extended, but vehicle control and stopping performance may be impacted
Solution Approach 1:
The anti-lock braking system is activated preemptively only when the vehicle speed approaches the determined threshold, not during normal braking operations. This preliminary action extends clutch disc lifespan by preventing excessive speed while leaving full vehicle control intact for all other driving conditions
Solution Approach 2:
The system dynamically adjusts the vehicle speed threshold parameter based on operating conditions (gear ratio, axle ratios, wheel size). This parameter change allows the braking intervention to occur at appropriate speeds for each transmission configuration, maintaining normal vehicle control characteristics while preventing clutch burst
3Reliability
If the vehicle speed threshold is set low to prevent clutch burst, then clutch disc protection is improved, but vehicle performance and drivability are reduced
Solution Approach 1:
The vehicle speed threshold is not fixed but dynamically determined based on operating parameters including gear ratio, axle ratios, and wheel size. This parameter change allows the threshold to be optimized for each specific transmission configuration, providing adequate clutch disc protection while maintaining vehicle performance and drivability across different operating conditions
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
Effectively prevents clutch burst by safely reducing vehicle speed when approaching the threshold, thereby extending clutch disc lifespan and maintaining transmission functionality, particularly beneficial for four-wheel drive vehicles in low-range gear modes.
Implementation Method 1
an anti-lock braking system configured to apply brakes of the vehicle
Data Source
AI summary
A control system for a vehicle having a manual transmission system includes an anti-lock braking system configured to apply brakes of the vehicle, a clutch pedal configured to control engagement/disengagement of a clutch disc with a pressure plate of the manual transmission system, and a controller configured to perform a clutch burst prevention technique when the clutch pedal is depressed such that the clutch disc is disengaged from the pressure plate, the clutch burst prevention technique comprising: obtaining a set of operating parameters of the vehicle, determining a vehicle speed threshold based on the set of operating parameters, the vehicle speed threshold being a speed of the vehicle at which clutch burst begins to occur, and when the vehicle speed is within a first threshold amount from the vehicle speed threshold, decreasing the vehicle speed by commanding the anti-lock braking system to apply the vehicle brakes.