Vehicle Deceleration Correction for Single-Pedal Stopping Accuracy
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Solution Overview
Problem
In vehicles with single pedal function, drivers not accustomed to the operation often struggle with deceleration, leading to inadequate stopping, particularly when the timing of the deceleration operation is delayed, resulting in potential over-stopping or insufficient inter-vehicle distance.
Innovation Solution
The vehicle incorporates a deceleration correcting unit that adjusts the deceleration based on predicted and target stopping distances, using imaging devices and sensors to recognize the environment and correct the deceleration to ensure appropriate stopping, by increasing or maintaining deceleration as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single pedal is used for both acceleration and deceleration operations, then the ease of operation is improved, but the reliability of appropriate stopping is worsened when the driver is not accustomed to the operation
Solution Approach 1:
The control unit calculates the stopping distance based on the depression amount of the common pedal and provides feedback by adjusting the deceleration output. When the calculated stopping distance exceeds the distance to the target stop position, the system increases deceleration to ensure the vehicle stops at the correct position, thereby maintaining reliability while using a single pedal for both acceleration and deceleration.
2Ease of operation
If the deceleration operation timing is delayed, then the ease of operation is maintained, but the positioning accuracy at the target stop position is worsened
Solution Approach 1:
The control unit performs preliminary calculation of the stopping distance based on the depression amount of the common pedal before the vehicle actually stops. This allows the system to anticipate whether the vehicle will stop at the correct position and adjust the deceleration in advance, ensuring accurate positioning even when the driver's deceleration timing is delayed.
3Measurement precision
If the deceleration is increased to prevent over-stopping, then the positioning accuracy is improved, but the comfort of the driver is worsened due to abrupt deceleration
Solution Approach 1:
The control unit dynamically adjusts the deceleration output based on the calculated stopping distance. When the stopping distance is within the acceptable range, the system maintains the driver's original deceleration input for comfort. When the stopping distance exceeds the target position, the system gradually increases deceleration to the necessary level, balancing positioning accuracy with driver comfort by making the adjustment dynamic rather than fixed.
Data Source
AI summary
A vehicle includes a common pedal that receives an acceleration operation and a deceleration operation in accordance with a depression amount, a deceleration deriving unit that derives a deceleration of the vehicle based on the deceleration operation of the common pedal, a first distance deriving unit that derives a predicted stopping distance that is a distance between a current position of the vehicle and a predicted stop position at which the vehicle is predicted to stop when travelling at the derived deceleration, a second distance deriving unit that derives a target stopping distance that is a distance between the current position of the vehicle and a target stop position at which the vehicle is to stop, and a deceleration correcting unit that corrects the deceleration of the vehicle based on the predicted stopping distance and the target stopping distance.