Vehicle Collision Avoidance Brake Control Unit Responsiveness
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Solution Overview
Problem
Existing vehicular collision avoidance control systems experience delays and fluctuations in responsiveness due to the delayed application of the desired deceleration rate required by the driver's brake operation, leading to suboptimal braking performance when collision avoidance control is active.
Innovation Solution
A vehicular collision avoidance control device and method that incorporates both feedback and feedforward control mechanisms, where the brake control unit stops feedback control upon detecting a driver's brake operation and adds the desired deceleration rate corresponding to the driver's brake operation to the calculated deceleration rate, ensuring timely and appropriate braking performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback control is applied using actual vehicle deceleration rate during collision avoidance control, then control accuracy on target deceleration rate is improved, but responsiveness to driver's brake operation is delayed
Solution Approach 1:
The brake control unit preemptively stops the feedback control when a driver's brake operation is detected, before the feedback control can delay the application of the desired deceleration rate. This preliminary action prevents the responsiveness issue from occurring in the first place, allowing the driver's brake operation to take effect immediately without being delayed by feedback control calculations.
2Measurement precision
If feedback control corrects vehicle deceleration rate based on actual deceleration rate, then desired deceleration rate is achieved, but fluctuations in vehicle deceleration rate occur
Solution Approach 1:
The system preemptively stops feedback control when driver brake operation is detected, preventing the feedback control loop from creating fluctuations in deceleration rate. By stopping feedback control before it can interfere, the system maintains stable deceleration characteristics while still achieving the desired deceleration rate through direct control.
3Reliability
If feedback control is continuously applied during collision avoidance control, then collision avoidance performance is maintained, but driver's brake operation effectiveness is reduced
Solution Approach 1:
The brake control unit dynamically switches control modes based on driver input detection. When a driver's brake operation is detected, the system transitions from feedback control to a mode that directly applies the desired deceleration rate without feedback correction. This dynamic adaptation allows the system to prioritize driver operation effectiveness while maintaining collision avoidance performance through appropriate control mode selection.
Data Source
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AI summary
A vehicular collision avoidance control device includes: a collision avoidance control unit that receives a vehicle deceleration rate that is an actual deceleration rate of a traveling vehicle and obtains a first desired deceleration rate for avoiding collision with an obstacle based on the received vehicle deceleration rate, a relative distance to the obstacle, and a target relative distance; and a brake control unit that obtains a desired deceleration rate for controlling a brake device by performing first control based on the received vehicle deceleration rate and the first desired deceleration rate and performing second control based on the first desired deceleration rate and stops the first control upon detection of a brake operation performed by a driver.