Vehicle Control Device Prioritizing Collision Avoidance Over Regeneration
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Solution Overview
Problem
The existing vehicle control systems face challenges in maintaining effective collision avoidance support when regeneration enhancement control and collision avoidance support control are simultaneously executed, leading to a rapid decrease in braking force and potential deterioration of collision avoidance performance.
Innovation Solution
A vehicle control device that prioritizes collision avoidance support control over regeneration enhancement control, inhibiting the start of regeneration enhancement control during collision avoidance support and ensuring regeneration enhancement control finishes before collision avoidance support begins, to maintain consistent braking force and improve collision avoidance precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regeneration enhancement control is executed to increase electric power recovery, then fuel consumption performance is improved, but collision avoidance support control performance deteriorates due to sudden braking force disappearance
Solution Approach 1:
The control device predicts the deceleration end position in advance and sets it as the target position for regeneration enhancement control. By using position information and prediction algorithms, the system determines where deceleration will naturally conclude, ensuring that regeneration enhancement control is terminated at the appropriate moment before collision avoidance support control begins, thus preventing sudden braking force changes
Solution Approach 2:
The control device continuously monitors the vehicle's deceleration state, position, and the execution status of both regeneration enhancement control and collision avoidance support control. Based on this feedback, the system dynamically adjusts control termination timing and coordinates between the two control modes, ensuring smooth transitions and maintaining reliable collision avoidance support
2Productivity
If regeneration enhancement control is finished based on predicted target stop position, then electric power recovery is maximized, but braking force becomes unstable when vehicle does not stop at predicted position
Solution Approach 1:
The control device dynamically adjusts the termination of regeneration enhancement control based on real-time vehicle state and actual position. Instead of using a fixed predicted stop position, the system continuously updates the deceleration end position prediction based on current deceleration rate, position, and collision avoidance support control status, allowing the braking force to remain stable under varying driving conditions
Solution Approach 2:
The system uses feedback from position sensors, deceleration sensors, and control execution status to continuously monitor whether the vehicle is actually stopping at the predicted position. When deviations are detected, the control device adjusts the regeneration enhancement control termination timing accordingly, maintaining braking force stability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach prevents the rapid decrease in braking force during collision avoidance, ensuring appropriate collision avoidance support control and maintaining efficient regenerative braking, thus enhancing the overall performance of collision avoidance systems.
Implementation Method 1
a regenerative braking device (11, 12, 13, 51, 53) configured to generate electric power by a wheel rotated by an external force and to recover the generated electric power to an in-vehicle battery
Implementation Method 2
a friction braking device (40, 45, 60) configured to apply a friction braking force to the wheel through a brake hydraulic pressure
Data Source
AI summary
Appropriate collision avoidance support control is enabled in a vehicle configured to carry out regeneration enhancement control. A predictive deceleration support control unit is configured to set a position at which the vehicle is predicted to finish deceleration as a target deceleration end position, and guide a driver to release an accelerator pedal so that the deceleration of the vehicle is finished at the target deceleration end position, to thereby carry out regeneration enhancement control under a state in which the accelerator pedal is released so as to generate a larger deceleration than in a normal state. The predictive deceleration support control unit is configured to read a collision avoidance support control flag from a collision avoidance support ECU, and stop the regeneration enhancement control when the collision avoidance support control is being carried out.