Dynamic Torque Limit Adjustment for Off-Road Speed Control
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Solution Overview
Problem
Conventional vehicle speed control systems are limited by an artificially imposed torque limit, which restricts off-road capability and vehicle performance, as they cannot exceed a predetermined torque capacity, even when higher torque is necessary for maintaining speed in challenging terrain.
Innovation Solution
A method and system that dynamically assesses the required torque for maintaining vehicle speed and, if necessary, temporarily increases the predetermined torque limit based on specific criteria such as current speed, powertrain output torque, and terrain conditions, allowing the speed control system to command higher torque when appropriate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a predetermined torque limit is imposed on the speed control system, then regulatory compliance and driver comfort are ensured, but off-road capability and vehicle performance are restricted
Solution Approach 1:
The torque limit is changed from a fixed predetermined value to a dynamic value that can be temporarily increased when off-road conditions are detected. The system monitors terrain type and vehicle operation mode, and adjusts the torque limit accordingly - maintaining the default limit for on-road compliance while allowing temporary increases for off-road capability.
Solution Approach 2:
The system changes the torque parameter from a constant predetermined limit to a variable limit based on operating conditions. When off-road mode is detected, the torque limit parameter is temporarily increased to allow higher torque output, then restored to the original limit when normal conditions resume.
2Productivity
If the torque limit is increased to improve off-road performance, then vehicle progress and capability are enhanced, but the risk of wheel slip and terrain damage increases
Solution Approach 1:
The torque limit adjustment is dynamic and temporary, only activated when off-road conditions are detected and automatically restored when normal conditions return. This ensures higher torque is available only when needed for vehicle progress while minimizing the duration of high torque application to reduce slip and terrain damage risks.
Solution Approach 2:
The system continuously monitors terrain type, vehicle speed, and operation mode to determine when torque limit increases are appropriate. This feedback mechanism ensures torque limits are adjusted based on actual conditions, allowing high torque for progress when on off-road terrain while preventing excessive torque that could cause slip or damage when conditions improve.
Data Source
AI summary
A method for operating a speed control system of a vehicle is provided. The method comprises identifying a torque required to achieve a desired operating parameter of the vehicle. The method further assessing whether the required torque exceeds a predetermined torque limit, and when it does, determining if it is appropriate to increase the torque limit. When it is determined that it is appropriate to do so, the method further comprises increasing the predetermined torque limit. A speed control system of a vehicle comprising an electronic control unit configured to: determine a torque required to achieve a desired operating parameter of the vehicle, assess whether the required torque exceeds a predetermined torque limit; when the torque exceeds the torque limit, determine if it is appropriate to increase the torque limit; and when it is determined that it is appropriate to do so, increase the torque limit, is also provided.