Variable Thresholds for Erroneous Accelerator Operation Detection
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Solution Overview
Problem
Conventional methods for determining erroneous accelerator pedal operation, such as detecting average pedal depression force, lack accuracy due to variable and situational-dependent accelerator operations, particularly in scenarios like parking areas where operations are not unitary.
Innovation Solution
A system utilizing cameras, sonars, wheel speed sensors, and a controller to set variable operation amount and time threshold values based on vehicle speed, road gradient, and accelerator operation time, improving determination accuracy by dynamically adjusting these thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed threshold value for pedal depression force is used to determine erroneous operation, then the determination method is simple, but the accuracy of determination deteriorates because accelerator operations vary by situation
Solution Approach 1:
The patent applies dynamics by making the threshold value variable rather than fixed. The threshold is dynamically adjusted based on vehicle speed, road gradient, and accelerator operation time, allowing the determination system to adapt to different driving situations and improve accuracy without excessive complexity
Solution Approach 2:
The patent changes the parameter of the threshold value from a constant to a variable that depends on multiple factors (vehicle speed, road gradient, operation time). This parameter transformation allows the system to account for situational variations in accelerator operations while maintaining a relatively simple determination framework
2Measurement precision
If variable threshold values based on multiple parameters are used, then the accuracy of erroneous operation determination is improved, but the device complexity increases
Solution Approach 1:
The control device performs multiple functions: it determines erroneous operations, calculates vehicle speed, road gradient, and operation time, and adjusts thresholds accordingly. By integrating these functions into a single multi-functional system, the patent improves accuracy while managing complexity through functional consolidation
Solution Approach 2:
The system uses its own operational data (accelerator operation amount and time) along with vehicle state data to automatically adjust its determination thresholds. This self-adjusting capability improves accuracy without requiring external calibration or complex manual configuration
Data Source
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AI summary
Improved is determination accuracy on whether or not a driver is erroneously performing an accelerator operation instead of a brake operation. A pedal opening degree PPO by a driver and a continuation time Te for which the pedal opening degree PPO is greater than an opening degree threshold value Pth are detected. When the continuation time Te exceeds a time threshold value Tth, it is determined that the driver is erroneously performing an accelerator operation instead of a brake operation. A vehicle speed V of a vehicle, a rising gradient Sr of a road surface, and an accelerator operation time Tp operated by the driver are detected. The opening degree threshold value Pth is made variable in accordance with the vehicle speed V, the rising gradient Sr, and the operation time Tp. The time threshold value Tth is made variable in accordance with the vehicle speed V, the rising gradient Sr, and the operation time Tp.