Vehicle Torque Control Apparatus for Front Wheel Slip Stabilization
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Solution Overview
Problem
Vehicle stability is compromised when front wheels slip on low μ roads, as increasing rear-wheel driving torque to compensate can lead to rear wheel slip and oversteer behavior.
Innovation Solution
A control apparatus that reduces front-wheel driving torque and adjusts rear-wheel driving torque to equal or less than front-wheel torque upon front wheel slip, stabilizing vehicle behavior by preventing excessive rear-wheel torque increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rear-wheel driving torque is increased to compensate for front wheel slip, then front wheel slip is canceled, but rear wheel slip and oversteer behavior occur
Solution Approach 1:
The control apparatus dynamically changes the torque distribution parameters between front and rear wheels based on detected slip conditions. When front wheel slip is detected, the system adjusts the torque parameters to reduce front torque and limit rear torque increase, preventing the harmful effect of rear wheel slip while maintaining front wheel grip.
Solution Approach 2:
The system continuously monitors wheel slip conditions and uses this feedback to adjust torque distribution in real-time. The control apparatus detects front wheel slip and immediately responds by modifying the torque applied to both front and rear wheels, creating a closed-loop control system that prevents rear wheel slip before it occurs.
2Reliability
If rear-wheel driving torque is increased to maintain total torque, then front wheel slip is corrected, but vehicle stability is compromised
Solution Approach 1:
The system changes the torque distribution parameters dynamically based on slip detection. Instead of maintaining a fixed torque distribution, the control apparatus adjusts the torque parameters to reduce front wheel torque and cap rear wheel torque at levels that prevent oversteer, thereby maintaining vehicle stability while still correcting front wheel slip.
Solution Approach 2:
The control apparatus applies preliminary anti-action by limiting the rear-wheel torque increase before it can cause harmful oversteer behavior. The system proactively constrains the rear torque to be equal to or less than the front torque, preventing the development of unstable vehicle behavior rather than reacting after instability occurs.
3Reliability
If front-wheel driving torque is reduced to cancel slip, then front wheel slip is eliminated, but total driving torque decreases
Solution Approach 1:
The control apparatus merges the torque control of front and rear wheels into a coordinated system. When front wheel slip is detected, the system combines torque reduction at the front with controlled torque application at the rear, creating a unified torque distribution strategy that maintains overall driving torque while eliminating front wheel slip.
Data Source
AI summary
A control apparatus includes a controller. Upon a slip of a front wheel of a vehicle, the controller executes torque adjustment control that reduces a driving torque of the front wheel of the vehicle and adjusts a driving torque of a rear wheel of the vehicle to equal to or less than the driving torque of the front wheel.