Off-Road Clutch Torque Control for Overheating Prevention
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Solution Overview
Problem
Off-road driving conditions can cause excessive heat buildup in vehicle clutches due to increased wheel slip, leading to reduced longevity and potential drivability issues, as existing systems lack proactive temperature management and driver notification.
Innovation Solution
A controller is programmed to enable an off-road transfer torque control mode that compares clutch temperatures to lower thresholds during off-road driving, displaying warnings to the driver and limiting engine power when temperatures exceed certain limits to prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the clutch operates during off-road driving with increased wheel slip, then the vehicle maintains traction and mobility, but the clutch temperature rises excessively leading to reduced longevity and potential failure
Solution Approach 1:
The system performs preliminary monitoring of clutch temperature during off-road driving conditions and provides advance warning to the driver before excessive heat buildup occurs. The controller detects temperature thresholds and notifies the driver through the user interface, allowing preventive action to be taken before clutch damage occurs.
Solution Approach 2:
The system implements continuous feedback monitoring of clutch temperature during off-road operation. The controller receives temperature data from sensors and provides real-time feedback to the driver through warnings and notifications, enabling the driver to adjust driving behavior to prevent clutch overheating while maintaining vehicle mobility.
2Reliability
If the clutch temperature is monitored continuously during off-road driving, then clutch overheating is prevented, but the system complexity and computational load increase
Solution Approach 1:
The system applies differentiated temperature monitoring specifically tailored to off-road driving conditions rather than uniform monitoring for all driving modes. The controller determines when off-road conditions exist and activates enhanced temperature monitoring only during those periods, reducing overall system complexity while maintaining reliability when needed.
Solution Approach 2:
The system changes monitoring parameters based on driving conditions. During off-road driving, the controller activates temperature monitoring with specific thresholds and warning levels. During normal on-road driving, monitoring is reduced or disabled, thereby managing clutch temperature reliability without requiring continuously complex system operation.
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
This solution effectively mitigates clutch overheating by reducing slip and power output, extending clutch longevity and improving drivability during off-road conditions by providing proactive warnings and power limiting measures.
Implementation Method 1
excessive heat buildup in vehicle clutches due to increased wheel slip
Data Source
AI summary
A vehicle includes an engine, a primary axle drivably connected to the engine, and a secondary axle drivably connected to the engine by a clutch. A controller is programmed to, in response to map data indicating that the vehicle is off-road, enable an off-road transfer torque control mode in which temperatures of the clutch are compared to a lower threshold. The controller is further programmed to, in response to the temperature of the clutch exceeding the lower threshold, display a message to a driver indicative of rising temperatures of the clutch, and, in response to a temperature of the clutch exceeding an upper limit, enable a power limiting mode in which torque of the engine is limited to a predefined value.