CVT Clutch Torque Modulation for Wheel Slip Spike Dissipation
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Solution Overview
Problem
Existing continuously variable transmission (CVT) systems face challenges in managing spike torque generated by wheel slip during abrupt road conditions, leading to potential belt slip and surface damage, as conventional methods have limitations in increasing clamping force to prevent slip.
Innovation Solution
A vehicle control system that includes a communicator to detect real-time wheel speed, a controller to evaluate allowable target speed, and a clutch mechanism with modulated torque capacity, using hydraulic or electronic actuation to dissipate spike torque by adjusting the torque capacity of the clutch mechanism when wheel slip is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clamping force is increased to prevent belt slip, then belt slip prevention is improved, but device complexity and potential for spike torque damage increase
Solution Approach 1:
The clutch mechanism acts as an intermediary component between the power source and the CVT pulley assembly. It mediates the torque transmission by being capable of disengagement, thereby protecting the belt from spike torque damage without requiring continuous high clamping force on the belt itself.
Solution Approach 2:
The clutch mechanism dynamically adjusts its torque capacity based on operating conditions. By modulating torque capacity in response to detected wheel slip, the system prevents belt slip during normal operation while allowing the clutch to disengage and absorb spike torques that would otherwise damage the belt.
2Object-affected harmful factors
If clutch torque capacity is reduced to dissipate spike torque, then protection from spike torque damage is improved, but torque transmission capability deteriorates
Solution Approach 1:
The controller periodically monitors wheel speed and clutch operation, activating the clutch only when wheel slip is detected. This periodic intervention allows the clutch to dissipate spike torque when needed while maintaining normal torque transmission capability during steady-state operation.
Solution Approach 2:
The clutch mechanism changes its torque capacity parameter dynamically. During normal operation, the clutch maintains full torque capacity for efficient power transmission. When wheel slip is detected, the clutch torque capacity is reduced to dissipate spike torque, thereby protecting the CVT system while maintaining the ability to transmit torque when conditions are favorable.
3Object-affected harmful factors
If wheel slip is allowed during abrupt road conditions, then spike torque generation is reduced, but vehicle control and productivity deteriorate
Solution Approach 1:
The controller continuously monitors wheel speed and provides feedback to determine when wheel slip occurs. Based on this feedback, the controller activates the clutch mechanism to dissipate spike torque, thereby preventing belt damage while maintaining vehicle control through active management of the torque transmission path.
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
The system effectively prevents CVT belt slip by modulating the torque capacity of the clutch mechanism, reducing the risk of surface damage and maintaining optimal torque transmission, even under adverse road conditions.
Implementation Method 1
the controller modulates the torque capacity of the clutch mechanism by communicating with a hydraulic pressure control
Implementation Method 2
a communicator operable to detect a real time speed of at least of the wheels
Data Source
AI summary
A vehicle control system in a vehicle having a continuously variable transmission (CVT) system with a clutch mechanism modulates a torque capacity of the clutch mechanism. The CVT system in the vehicle further includes a primary pulley, a secondary pulley and a CVT belt for transmitting a torque to wheels from a power source rotatably connected with an input shaft. The clutch mechanism includes a forward (FWD) clutch between the power source and a CVT pulley assembly. The vehicle control system detects a wheel slip of the CVT system and controls a torque capacity of the FWD clutch, and the system is configured for avoiding a slip of the CVT belt by dissipating a spike torque generated by the wheel slip.