One-Pedal Vehicle Control for Smooth Re-Acceleration Transition
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Solution Overview
Problem
In existing one-pedal drive systems, the acceleration range of the accelerator pedal position depends on the preceding situation, leading to varying driving force and acceleration degree even with the same pedal depression angle, causing driver discomfort.
Innovation Solution
A control device for vehicles with an one-pedal function that sets continuous areas for operation amounts, including a deceleration area, a dead-band area, and an acceleration area, where the control unit performs braking force suppression control by generating a smaller braking force when the change speed of the operation amount within the deceleration area is positive and above a predetermined speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the accelerator pedal map is corrected in response to vehicle speed decrease during deceleration, then the adaptive accelerator pedal map can control re-acceleration, but the acceleration range depends on preceding situation causing varying driving force even with same pedal depression angle
Solution Approach 1:
The accelerator pedal operation amount is divided into three distinct continuous areas: deceleration area, dead-band area, and acceleration area. This segmentation allows the system to clearly distinguish between deceleration intentions and acceleration intentions, eliminating the ambiguity that causes varying driving force for the same pedal depression angle.
Solution Approach 2:
The control unit dynamically determines the operation area based on real-time pedal operation amount and change speed. When the change speed in the deceleration area exceeds a predetermined threshold, the system transitions from deceleration control to acceleration control, adapting the braking force suppression dynamically rather than relying on static map correction.
2Speed
If braking force is applied during deceleration in one-pedal drive system, then vehicle speed can be controlled, but depressing accelerator pedal during deceleration may cause uncomfortable feeling due to conflicting forces
Solution Approach 1:
The control unit performs preliminary detection of the pedal change speed while the vehicle is in deceleration mode. When the change speed exceeds the predetermined threshold, the system proactively suppresses braking force before the conflict between deceleration and acceleration forces occurs, preventing uncomfortable feelings rather than reacting after the problem arises.
Solution Approach 2:
The system converts the potentially harmful conflicting forces into a beneficial transition. By detecting rapid pedal depression during deceleration, the system interprets this as an acceleration intention and suppresses braking force, thereby converting the harmful force conflict into a smooth acceleration transition that benefits driver comfort.
Data Source
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AI summary
[Object] It is to provide a control device of a vehicle with an one-pedal function, to allow, even when an accelerator pedal is depressed during a deceleration of the vehicle, the vehicle to transit to an acceleration state in accordance with a driver's acceleration intention without a driver's uncomfortable feeling. [Solution] There is provided a control device of a vehicle 1, to accelerate/decelerate the vehicle based on an amount of an operation to an accelerator pedal 90, the control device being configured to set in advance, as continuous areas to which the amount of the operation belongs, a deceleration area to consider the operation as a deceleration operation, an acceleration area to consider the operation as an acceleration operation, and a dead-band area to consider the operation as neither of the deceleration and acceleration operations, the amounts within the deceleration, dead-band, and acceleration areas being larger in this order, a deceleration degree becoming larger as the amount becomes smaller within the deceleration area, an acceleration degree becoming larger as the amount becomes larger within the acceleration area, the control device including a control unit 11 to perform, when a change speed of the operation amount of the accelerator pedal 90 within the deceleration area is a predetermined speed of positive value or larger, a braking force suppression control of generating a smaller braking force than in a case of the change speed smaller than the predetermined speed.