Driving Assistance Apparatus Deceleration Arbitration
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Solution Overview
Problem
Drivers may feel discomfort when deceleration assistance control is released due to brake pedal operation, leading to insufficient deceleration and potential failure to stop the vehicle at the intended target position.
Innovation Solution
A driving assistance apparatus that estimates the driver's operation intention using a brake pedal estimator and delays the timing of deceleration assistance termination if the intention is aligned with a target, thereby adjusting the arbitration between system and driver deceleration to prevent the 'G losing' sensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If deceleration assistance control is released due to brake pedal operation, then the driver can take control of deceleration, but the driver may feel discomfort due to sudden deceleration changes
Solution Approach 1:
The system applies preliminary anti-action by predicting the driver's intended deceleration based on brake pedal operation patterns before the driver's input fully takes effect. The controller calculates predicted deceleration amounts and compares them with actual deceleration assistance to prevent sudden, uncomfortable deceleration changes. This anticipatory approach smooths the transition from automated to driver-controlled deceleration.
Solution Approach 2:
The system performs preliminary action by pre-calculating the relationship between brake pedal operation amounts and resulting deceleration. The estimator determines the driver's intended deceleration in advance, and the controller uses this information to adjust the deceleration assistance amount before the driver's input would cause abrupt changes, ensuring smooth and comfortable deceleration transitions.
2Adaptability or versatility
If deceleration assistance amount is reduced when driver operates brake pedal, then driver input is respected, but the vehicle may not decelerate sufficiently to reach the target position
Solution Approach 1:
The system implements feedback by continuously monitoring the relationship between brake pedal operation amounts and actual vehicle deceleration. The estimator uses this feedback to determine the driver's intended deceleration, and the controller adjusts the deceleration assistance amount based on this determination. This closed-loop approach ensures the vehicle can reach the target position while respecting driver input, as the system continuously adapts to maintain both goals.
Data Source
AI summary
A driving assistance apparatus is configured to provide deceleration assistance of decelerating a host vehicle, and is configured to end the deceleration assistance on condition that a pedal operation is performed by a driver while the deceleration assistance is provided. The driving assistance apparatus is provided with: an estimator configured to estimate an operation intention of the driver associated with an operation of a brake pedal, on condition that the brake pedal is operated by the driver while the deceleration assistance is provided; and a controller programmed to delay timing in which a deceleration assistance amount associated with the deceleration assistance becomes zero at the end of the deceleration assistance, if the estimated operation intention is caused by the target, in comparison with that if the estimated operation intention is not caused by the target.