Vehicle Speed Control System Slip Event Threshold Adaptation
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Solution Overview
Problem
Existing vehicle speed control systems, such as cruise control, are ineffective in off-road driving conditions due to frequent wheel slip events, which cause the system to cancel and require user intervention, making them unreliable for low-speed progress on slippery or icy terrain.
Innovation Solution
A vehicle speed control system that allows users to set a target speed independently of wheel slip events, using torque control and braking to maintain speed without disabling the system, even when traction control or stability systems are activated, and allows speed adjustments via brake or accelerator pedals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cruise control system disables itself upon detecting wheel slip events, then the system avoids unreliable operation on slippery terrain, but the system becomes ineffective for low-speed progress in off-road conditions where wheel slip is frequent
Solution Approach 1:
The system dynamically adapts its behavior based on operating conditions by introducing a slip event threshold parameter. When wheel slip frequency exceeds this threshold, the system transitions from automatic disabling to continued operation, allowing it to adapt to off-road conditions where slip is frequent but controlled operation is still desired
Solution Approach 2:
The system changes the operational parameter of slip event detection by comparing the frequency of slip events against a configurable threshold. This parameter-based approach allows the system to distinguish between hazardous slip conditions that require disabling and acceptable slip conditions that should permit continued operation
2Reliability
If the system requires user intervention to reactivate after slip events, then the system maintains safety by preventing unintended operation, but the system increases driver workload in challenging terrains
Solution Approach 1:
The system provides self-service by automatically determining whether to remain disabled or continue operation based on the slip event threshold comparison. This eliminates the need for manual user intervention in reactivating the system, reducing driver workload while maintaining safety through automated decision-making
3Adaptability or versatility
If the cruise control system operates at low speeds, then the system enables progress in congested traffic and off-road conditions, but the system increases the risk of low-speed collisions
Solution Approach 1:
The system dynamically adjusts its operational status based on real-time slip event frequency. By continuously monitoring and comparing slip events against the threshold, the system can adaptively enable or disable operation to manage collision risk while maintaining low-speed capability when conditions are acceptable
Data Source
AI summary
A vehicle speed control system for a vehicle having a plurality of wheels, the vehicle speed control system comprising one or more electronic control units configured to carry out a method that includes applying torque to at least one of the plurality of wheels, detecting a slip event between any one or more of the wheels and the ground over which the vehicle is travelling when the vehicle is in motion and providing a slip detection output signal in the event thereof. The method carried out by the one or more electronic control units further includes receiving a user input of a target speed at which the vehicle is intended to travel and maintaining the vehicle at the target speed independently of the slip detection output signal by adjusting the amount of torque applied to the at least one of the plurality of wheels.