Vehicle Control Device Attitude Stability During Shock Absorber Failure
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Solution Overview
Problem
Existing vehicle control systems rely on shock absorbers to control vehicle body attitude, but fail to maintain control when the shock absorber fails, leading to instability.
Innovation Solution
A control apparatus that calculates braking/driving force attitude control amounts and adjusts damping forces to maintain vehicle body attitude control, even in the event of shock absorber failure, using a braking/driving force attitude control unit, a damping force control unit, a traveling state detector, and an abnormality detector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vehicle body attitude is controlled only by damping force of shock absorber, then control simplicity is maintained, but control reliability deteriorates when shock absorber fails
Solution Approach 1:
The control system is designed to perform vehicle body attitude control through multiple actuators: shock absorbers for normal operation, and braking/driving forces as backup. The braking/driving force attitude control amount calculation unit enables the brake system to universally perform attitude control function when shock absorber fails, ensuring control reliability without excessive complexity increase
Solution Approach 2:
The abnormality detector continuously monitors shock absorber status and detects failures in advance. When abnormality is detected, the system proactively switches to braking/driving force-based attitude control by calculating the braking/driving force attitude control amount based on the target attitude control amount, preventing loss of control reliability before it occurs
2Reliability
If shock absorber fails, then damping force cannot be generated, but vehicle body attitude control must be maintained
Solution Approach 1:
When shock absorber fails and damping force is lost, the system converts the harmful vehicle instability into a beneficial controlled state by using braking/driving forces to generate the necessary attitude control moment. The braking/driving force attitude control amount calculation unit calculates the required braking/driving force based on the target attitude control amount, transforming the failure condition into a recoverable state that maintains attitude control continuity
Solution Approach 2:
The braking/driving force acts as an intermediary mechanism between the failed shock absorber and the vehicle body attitude. When shock absorber fails, the brake system mediates the attitude control function by applying braking/driving forces that create moments to control vehicle body pitch and roll, preventing direct vehicle instability
Data Source
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AI summary
The present invention is provided with: a traveling state detection means that detects the traveling state of a vehicle and that has a braking/driving force posture control amount computation means, which computes an amount of braking/driving force posture control controlled by means of the braking/driving force of the vehicle in a manner so that the posture of the vehicle body becomes a target posture, and an attenuating force control means, which controls the attenuating force of a shock absorber on the basis of the amount of braking/driving force posture control; a target posture control amount computation means that computes a target posture control amount of the vehicle body on the basis of the traveling state; and an abnormality detection means that detects abnormalities of the shock absorber. When an abnormality has been detected by the abnormality detection means, on the basis of the target posture control amount, the braking/driving force posture control amount computation means computes the amount of braking/driving force posture control controlled by means of the braking/driving force of the vehicle.