Vehicle Control System for One-Pedal Mode Acceleration
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Solution Overview
Problem
Existing vehicle control systems in one-pedal mode fail to accurately control acceleration in line with the driver's intention, often resulting in shocks or uncomfortable deceleration when transitioning between accelerator and brake pedals, due to misestimation of braking force and accelerator pedal intentions.
Innovation Solution
A vehicle control system that uses a detector and controller to assess the operating speed and amount of pedals returned to their initial positions, adjusting the target acceleration to correct for fast returns, thereby enhancing acceleration or deceleration based on driver intent, and gradually reducing corrections to avoid shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the reference range is shifted toward decelerating range when brake pedal is depressed, then the vehicle can be accelerated easily by depressing the accelerator pedal after braking, but the acceleration intended by the driver may not be generated when depressing the accelerator pedal after releasing the brake pedal
Solution Approach 1:
The system performs preliminary action by shifting the reference range toward decelerating range when the brake pedal is depressed, preparing the acceleration characteristic in advance. This allows the vehicle to be accelerated easily when the driver depresses the accelerator pedal after braking, as the reference range is already positioned to facilitate quick acceleration response.
Solution Approach 2:
The reference range is made dynamic rather than fixed. It shifts toward the decelerating range when the brake pedal is depressed and returns to its original position when the brake pedal is released. This dynamic adjustment allows the system to adapt acceleration characteristics based on current pedal operations, resolving the contradiction between ease of operation and measurement precision.
2Adaptability or versatility
If the reference range is shifted significantly when brake pedal is depressed, then the acceleration characteristic is changed significantly, but a shock is generated when returning the reference range to the original range
Solution Approach 1:
The reference range dynamically adjusts its position based on brake pedal depression, enabling significant changes in acceleration characteristic when needed. The system maintains high adaptability by allowing the reference range to shift toward decelerating range during braking, while the gradual return mechanism prevents harmful shocks.
Solution Approach 2:
The system applies beforehand cushioning by gradually returning the reference range to its original position after brake release, rather than making abrupt changes. This gradual return process cushions the transition and prevents shocks to the driver, while still maintaining the adaptability to shift significantly when the brake pedal is depressed.
3Stability of the object's composition
If the vehicle is decelerated continuously after releasing the brake pedal, then the deceleration is maintained, but the vehicle may not be accelerated satisfactory when the accelerator pedal is depressed
Solution Approach 1:
The system dynamically adjusts the reference range position based on brake pedal operations. When the brake pedal is released, the reference range gradually returns to its original position, which dynamically changes the acceleration characteristic from continuous deceleration to accelerated response. This resolves the contradiction by making the deceleration stable during braking while enabling satisfactory acceleration performance after brake release.
Data Source
AI summary
A vehicle control system to control acceleration in line with the driver's intention when depressing one of an accelerator pedal and a brake pedal after releasing the other one of the pedals in one-pedal mode. The vehicle control system is configured to obtain an operating speed of one of an accelerator pedal and a brake pedal returned to an initial position, set a target acceleration based on an operating amount of the other pedal depressed after releasing said one of the pedals, and increase a correction amount to correct the target acceleration if the operating speed of the returned pedal is fast.