Vehicle Brake Hold Threshold Adjustment
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Solution Overview
Problem
Existing vehicle control systems tend to provide negative evaluations of a driver's operation when the accelerator pedal is depressed to start the vehicle while the brake hold control is being executed, leading to dissatisfaction due to steep acceleration rises, which can be misinterpreted as abrupt pedal depression.
Innovation Solution
A device that includes a threshold modifier to increase the evaluation threshold for a predetermined period when the accelerator pedal is depressed during brake hold control, reducing the likelihood of negative evaluations by modifying the acceleration evaluation criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the brake hold control is executed when the vehicle is stationary, then the vehicle remains stationary without creeping, but the acceleration rises steeply when the accelerator pedal is depressed, leading to negative evaluation of driver operation
Solution Approach 1:
The system performs preliminary action by detecting the brake hold control execution state before the accelerator pedal is depressed. When brake hold control is detected as executing, the system preliminarily prepares to modify the evaluation threshold, thereby preventing the steep acceleration rise from being misinterpreted as abrupt pedal depression before it occurs.
Solution Approach 2:
The system changes the evaluation threshold parameter dynamically based on the brake hold control state. When brake hold control is executing, the threshold for evaluating driver operation is increased, which compensates for the steep acceleration rise caused by brake release, thereby preventing false negative evaluations of driver operation.
2Device complexity
If the evaluation threshold is kept constant, then the evaluation system is simple, but it produces negative evaluations when starting with brake hold control active, causing driver dissatisfaction
Solution Approach 1:
The evaluation threshold is transformed from a static constant value to a dynamic value that automatically adjusts based on the brake hold control execution state. The threshold modifier changes the threshold higher when brake hold control is executing, and restores it when not executing, thereby adapting the evaluation system to different operating conditions without complex manual intervention.
Solution Approach 2:
The system implements feedback by continuously monitoring the brake hold control execution state and using this information to adjust the evaluation threshold. The threshold modifier receives feedback about whether brake hold control is active and automatically modifies the threshold accordingly, creating a closed-loop system that improves evaluation accuracy while maintaining simplicity.
Data Source
AI summary
Disclosed herein is a device for controlling a vehicle. The device includes: a driving operation evaluator; a brake device controller for executing a brake hold control if a predetermined brake hold condition is met while the vehicle is stationary; and a threshold modifier. The driving operation evaluator evaluates driver's operation of the vehicle positively if an evaluation target value is equal to or less than a predetermined threshold value, or otherwise negatively if the evaluation target value is more than the predetermined threshold value. When the accelerator pedal is depressed in a situation where the brake hold control is being executed while the vehicle is stationary, the threshold modifier increases the predetermined threshold value for a predetermined period since the driver started to depress the accelerator pedal.