Dynamic Drive Force Control for Erroneous Accelerator Pedal Operation
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Solution Overview
Problem
Conventional driving assistance systems fail to prevent rapid vehicle acceleration when the driver mistakenly operates the accelerator pedal instead of the brake, leading to discomfort due to unintended acceleration when the driver attempts to decelerate.
Innovation Solution
A driving assistance apparatus comprising an accelerator pedal, an accelerator operation amount sensor, and a control unit that determines erroneous operations and adjusts the drive force to prevent rapid acceleration by setting the drive force to a lower 'erroneous operation coping drive force' during repeated accelerator errors, and increases it when the error is resolved, ensuring the vehicle accelerates as intended when the driver intends to do so.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive force suppressing processing is executed for a fixed time period after erroneous operation detection, then the vehicle acceleration is restricted during the erroneous operation, but the driver may panic and erroneously restart the accelerator operation when intending to decelerate
Solution Approach 1:
The prohibition period is made dynamic rather than fixed. The control unit extends the prohibition period when repeated erroneous operations are detected, and shortens or cancels it when legitimate accelerator operations are detected. This dynamic adjustment resolves the contradiction by adapting the restriction duration to the actual driving context, preventing panic-induced erroneous restarts while maintaining driver flexibility for legitimate operations.
Solution Approach 2:
The system continuously monitors accelerator operation patterns and provides feedback to adjust the prohibition period. When the driver performs a legitimate accelerator operation during the prohibition period, the system detects this through the operation amount sensor and cancels the prohibition, providing immediate feedback that resolves the contradiction between preventing erroneous operations and allowing legitimate driver intent.
2Reliability
If the prohibition period is extended to prevent repeated erroneous operations, then rapid acceleration is prevented, but the driver experiences discomfort when legitimate accelerator operations are blocked
Solution Approach 1:
The prohibition period duration is dynamically adjusted based on the detection of repeated erroneous operations. For the first erroneous operation, a standard prohibition period is applied. When repeated erroneous operations are detected within a predetermined time, the prohibition period is extended. This dynamic approach prevents unnecessary blocking of legitimate operations while providing stronger prevention for repeated errors, resolving the contradiction between reliability and driver comfort.
Solution Approach 2:
The system monitors the relationship between the prohibition period and subsequent accelerator operations. When a legitimate operation is detected during an extended prohibition period, the system provides feedback by canceling the prohibition, thereby eliminating driver discomfort while maintaining erroneous operation prevention through the extended period when actually needed.
3Reliability
If the drive force is restricted during erroneous operation period, then vehicle safety is improved, but the vehicle fails to accelerate when the driver intends to accelerate according to intention
Solution Approach 1:
The system continuously monitors accelerator operation amounts during the prohibition period. When the operation amount exceeds a predetermined threshold, indicating legitimate driver intent to accelerate, the system provides feedback by canceling the prohibition period and restoring normal drive force. This resolves the contradiction by maintaining safety during erroneous operations while ensuring productivity when legitimate acceleration is intended.
Data Source
AI summary
A driving assistance apparatus makes a drive force of a vehicle equal to an erroneous operation coping drive force which is smaller than an ordinary drive force in a period from a satisfaction of an erroneous operation start condition which is satisfied when an accelerator pedal is operated erroneously to a satisfaction of an erroneous operation end condition which is satisfied when the erroneous operation has ended. The erroneous operation coping drive force is set to a first drive force if the erroneous operation start condition becomes satisfied after a reoperation determination time point at which a time threshold elapses from when the erroneous operation end condition became last satisfied. Meanwhile, the erroneous operation coping drive force is set to a second drive force which is greater than the first drive force if the erroneous operation start condition becomes satisfied before the reoperation determination time point.