Vehicle Drive Force Control Device for Wheel Slip Suppression
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Solution Overview
Problem
Existing vehicle control systems fail to effectively suppress slipping of main drive wheels during changes in speed-change ratio, leading to instability.
Innovation Solution
A control device that detects changes in speed-change ratio and adjusts drive force distribution by increasing the drive force of the auxiliary drive wheel and reducing the main drive wheel force, using calculation units to determine appropriate force adjustments based on slippage and vehicle state parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive force distribution is adjusted by reducing drive force to auxiliary drive wheels when deviation decreases, then the drive force to main drive wheels remains high, but the main drive wheels may slip
Solution Approach 1:
The control device performs preliminary action by detecting changes in speed-change ratio before main drive wheel slipping occurs. When a change in speed-change ratio is detected, the control device proactively increases drive force to auxiliary drive wheels and reduces drive force to main drive wheels, preventing slipping before it happens rather than reacting after deviation is detected
Solution Approach 2:
The control device uses feedback by continuously monitoring the speed-change ratio of the transmission and adjusting drive force distribution accordingly. The detection of speed-change ratio changes provides real-time feedback that triggers appropriate drive force adjustments to maintain optimal traction and prevent wheel slipping
2Reliability
If the drive force distribution is adjusted based on rotational state deviation, then the control responds to wheel slip conditions, but it fails to detect slipping during speed-change ratio transitions
Solution Approach 1:
The control device monitors speed-change ratio as a preliminary indicator of potential slipping conditions. By detecting changes in speed-change ratio before actual wheel slip occurs, the system can take preventive action rather than waiting for rotational state deviation to manifest, improving detection capability during transmission transitions
Solution Approach 2:
The speed-change ratio serves as an intermediary parameter that indirectly indicates potential slipping conditions. Instead of directly measuring wheel slip, the control device uses speed-change ratio changes as a mediator to predict and prevent slipping, making detection easier and more proactive
Data Source
AI summary
A control device for controlling a front wheel drive force and a rear wheel drive force of a vehicle that includes a transmission comprises: a first controller for controlling a drive force of a main drive wheel and a drive force of an auxiliary drive wheel, the drive force of the main drive wheel being one of the front-wheel drive force and the rear-wheel drive force, and the drive force of the auxiliary drive wheel being another of the front-wheel drive force and the rear-wheel drive force; and a second controller for detecting whether a speed-change ratio of the transmission has changed. In a case that the second controller has detected that the speed-change ratio has changed, the first controller increases the drive force of the auxiliary drive wheel and reduces the drive force of the main drive wheel.