Brake Priority Throttle Control for Stuck Accelerator Scenarios
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Solution Overview
Problem
Existing systems for controlling internal combustion engine output fail to distinguish between intentional and unintentional brake pedal depression when the accelerator pedal is stuck, leading to excessive deceleration and deteriorated driving performance.
Innovation Solution
A control device and method that dynamically adjust throttle opening based on the duration of brake pedal depression and accelerator pedal operation, using a brake priority determination unit to limit engine torque only when necessary, ensuring safe deceleration and stopping while maintaining driving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the opening of the throttle valve is limited when the brake pedal is depressed, then the vehicle can be stopped safely even if the accelerator pedal is stuck, but the driving performance deteriorates when the driver intentionally depresses the brake pedal with the left foot
Solution Approach 1:
The throttle valve opening control is made dynamic by adjusting the target throttle opening based on the duration that the accelerator pedal has been depressed. When the brake pedal is depressed, the system calculates a target throttle opening that decreases as the accelerator pedal depression duration increases, allowing the system to adapt between safety and performance requirements over time
Solution Approach 2:
The control system changes the parameter of target throttle opening based on the temporal relationship between accelerator and brake pedal operations. By monitoring how long the accelerator pedal has been depressed before brake application, the system adjusts the throttle opening limit to distinguish between stuck accelerator scenarios and intentional left-foot braking
2Reliability
If the opening of the throttle valve is limited when the accelerator pedal operation amount is kept substantially constant for a predetermined time or longer and the brake pedal is depressed, then the vehicle can be stopped when there is a trouble with the accelerator pedal, but a feeling of deceleration more than anticipated is given to the driver and driving performance is deteriorated
Solution Approach 1:
The target throttle opening is dynamically adjusted based on the duration of accelerator pedal depression. The system provides a gradual transition rather than an abrupt limitation, allowing the driver to acclimate to the deceleration and reducing the sensation of excessive deceleration
Solution Approach 2:
The control system performs preliminary assessment of the accelerator pedal operation duration before applying full throttle limitation. By monitoring the accelerator pedal state over time and only applying aggressive limitation after a predetermined duration, the system avoids unnecessary performance degradation for normal driving maneuvers
Data Source
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AI summary
The present invention concerns an output control device for an internal combustion engine for generating a drive force of a vehicle. The output control device includes a braking request detection sensor for detecting whether or not a braking request operation has been performed, and a controller programmed to calculate a braking operation time from the start of the braking request operation, and limit an output of the internal combustion engine when the braking operation time becomes longer than a predetermined time.