Vehicle Speed Control Predicting Wheel Slip
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Solution Overview
Problem
Existing vehicle speed control systems fail to adapt to terrain conditions and wheel slip events, leading to reduced vehicle composure and occupant comfort, especially in off-road or slippery conditions, as they maintain a set speed without considering the vehicle's load or terrain type.
Innovation Solution
A method and system that detect slip events and step encounters at a leading wheel, predict their occurrence at a following wheel, and automatically adjust vehicle speed or acceleration to maintain stability and comfort, using an electronic control unit to intervene and control torque distribution between wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the speed control system maintains a user-selected set-speed, then the driving workload is reduced, but vehicle composure and occupant comfort are adversely affected when terrain conditions or wheel slip events occur
Solution Approach 1:
The control system predicts future wheel slip events at following wheels based on slip events detected at leading wheels, and takes preventive action by adjusting vehicle speed or acceleration before the slip occurs. This anticipatory approach maintains vehicle composure while preserving cruise control operation.
Solution Approach 2:
The system continuously monitors wheel slip events at leading wheels and uses this feedback to adjust vehicle speed or acceleration. This closed-loop control ensures vehicle composure is maintained while keeping the cruise control system active, resolving the contradiction between ease of operation and reliability.
2Extent of automation
If the speed control system maintains a set-speed without intervention, then automated speed control is achieved, but the system is cancelled when wheel slip events occur, requiring user intervention
Solution Approach 1:
The system predicts wheel slip events at following wheels before they occur based on leading wheel slip detection. By taking preliminary speed control actions, the system prevents slip-related cancellation and maintains automated operation continuity.
Solution Approach 2:
The system uses feedback from leading wheel slip events to continuously adjust speed control parameters, preventing the conditions that would trigger system cancellation. This maintains both automation and system continuity.
3Productivity
If the vehicle travels at a high set-speed, then productivity is improved, but vehicle composure and occupant comfort are adversely affected when terrain conditions are encountered
Solution Approach 1:
The system dynamically adjusts vehicle speed or acceleration based on real-time detection of wheel slip events at leading wheels and predictions of following wheel conditions. This dynamic control maintains productivity by keeping the cruise control active while adapting speed to maintain vehicle composure.
Solution Approach 2:
The system uses feedback from wheel slip detection to dynamically adjust speed parameters, allowing high-speed operation when conditions permit while automatically reducing speed when slip events indicate terrain challenges, thus maintaining both productivity and vehicle composure.
Data Source
AI summary
A method for operating a speed control system of a vehicle is provided. The method comprises detecting an occurrence of a slip event, of a step encounter event, or of both events at a leading wheel of the vehicle. The method also comprises predicting that the occurrence of the detected event(s) will occur at a following wheel of the vehicle. The method yet further comprises automatically controlling vehicle speed, vehicle acceleration, or both vehicle speed and acceleration in response to the detection, the prediction, or both the detection and prediction. A speed control system comprising an electronic control unit (ECU) configured to perform the above-described methodology is also provided.