Vehicle Accelerator Control Hysteresis for Driver Perception
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Solution Overview
Problem
Existing vehicle control systems experience discomfort for drivers due to a decrease in operation gain when the accelerator pedal is returned, leading to difficulty in perceiving changes in acceleration, which can cause a sense of spontaneous acceleration.
Innovation Solution
A vehicle control system that includes an accelerator sensor, a processor for setting target acceleration and torque, and a drive source controller, which sets a lower pedal-returning target acceleration than depression-increasing target acceleration, with hysteresis characteristics to improve driver perception and operability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the target acceleration is set to increase as accelerator opening becomes wider following natural characteristics, then the output limit of the drive source is considered, but the operation gain decreases toward wider opening side causing driver discomfort when accelerator pedal is returned
Solution Approach 1:
The patent applies dynamics by making the target acceleration characteristics different depending on the direction of accelerator pedal movement. The control system dynamically switches between depression-increasing target acceleration (when accelerator opening increases) and pedal-returning target acceleration (when accelerator opening decreases), allowing the system to adapt its behavior based on the operational context and resolve the contradiction between natural characteristics and driver perception.
Solution Approach 2:
The patent applies local quality by setting different target acceleration values for different operational states (depression-increasing vs. pedal-returning conditions). Under the same accelerator opening condition, the system sets pedal-returning target acceleration lower than depression-increasing target acceleration, creating locally optimized characteristics for each state to maintain driver perception while respecting output limits.
2Power
If the operation gain is lowered in wide opening range to consider output limit, then the drive source output limit is respected, but the driver has difficulty perceiving acceleration change when accelerator pedal is returned
Solution Approach 1:
The control system dynamically adjusts target acceleration based on the direction of accelerator pedal movement. When the accelerator pedal is returned, the system switches to pedal-returning target acceleration characteristics that maintain higher operation gain, making acceleration changes perceptible to the driver while still respecting the drive source output limits during depression-increasing operations.
Solution Approach 2:
The patent changes the target acceleration parameter based on operational state. By setting pedal-returning target acceleration lower than depression-increasing target acceleration under the same accelerator opening condition, the system creates hysteresis characteristics that maintain driver perception of acceleration changes while managing the drive source output limit.
Data Source
AI summary
A vehicle control system includes an accelerator sensor which detects an accelerator opening, a target acceleration setting unit which sets a target acceleration of a vehicle based on the detected accelerator opening, a target torque setting unit which sets a target torque of a drive source based on the set target acceleration, and a drive source controller which controls the drive source to generate the set target torque. In a case where the target acceleration at a time when the accelerator opening is increased is set as a depression-increasing target acceleration and the target acceleration at a time when the accelerator opening is decreased is set as a pedal-returning target acceleration, under the same condition of the accelerator opening, the target acceleration setting unit sets the target acceleration such that the pedal-returning target acceleration becomes lower than the depression-increasing target acceleration.