Vehicle Acceleration Suppression Device for Dynamic Throttle Control
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Solution Overview
Problem
Existing vehicle acceleration suppression technologies, such as those described in PTL 1, often deteriorate operability when entering a parking lot, as they control the throttle in a deceleration direction regardless of the accelerator operation, leading to reduced parking efficiency and increased risk of acceleration errors.
Innovation Solution
A vehicle acceleration suppression device that adjusts the suppression degree based on the parking frame entering certainty degree, allowing for reduced acceleration suppression in low certainty conditions to maintain operability and increased suppression in high certainty conditions to enhance safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If throttle control is operated in deceleration direction based on vehicle speed when entering parking lot, then acceleration suppression effect is improved, but operability in traveling deteriorates
Solution Approach 1:
The patent applies dynamics by making the acceleration suppression control dynamically adjustable based on the detected parking lot entry state. The control unit varies the degree of throttle suppression according to the confidence level of parking lot detection, enabling the system to adapt between strong suppression when parking is certain and minimal suppression when traveling is intended, thus resolving the contradiction between safety and operability
Solution Approach 2:
The patent changes the control parameter (throttle suppression degree) based on the detected state. When the vehicle speed exceeds a threshold and parking lot entry is detected, the system adjusts the acceleration suppression parameter according to the detected certainty level, allowing flexible control that improves both safety and operability under different conditions
2Reliability
If acceleration suppression control is applied when vehicle speed is high, then safety is improved, but parking efficiency deteriorates
Solution Approach 1:
The system dynamically adjusts the acceleration suppression intensity based on the detected parking lot entry state and vehicle speed. When high-speed entry into parking lot is detected with high certainty, the control is applied safely; when certainty is low, suppression is reduced, thereby maintaining both safety and parking efficiency
3Reliability
If throttle control suppresses acceleration regardless of accelerator operation, then operational error prevention is improved, but driver intent responsiveness deteriorates
Solution Approach 1:
The patent implements feedback by continuously monitoring the accelerator operation state and adjusting the throttle control accordingly. The control unit detects both the accelerator depression amount and the parking lot entry state, then adjusts acceleration suppression based on this feedback, allowing the system to distinguish between intentional acceleration and potential operational errors, thus maintaining both safety and driver intent responsiveness
Data Source
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AI summary
A total certainty factor indicating a total degree of certainty of the parking frame certainty degree and the parking frame entering certainty degree is calculated based on a parking frame certainty degree indicating the degree of certainty that a parking frame is present in a travel direction of a vehicle, and a parking frame entering certainty degree indicating the degree of certainty that the vehicle enters the parking frame. When the total certainty factor is low, acceleration of the vehicle controlled according to an operation amount of an accelerator pedal for instructing a driving force by operation of a driver is suppressed with a low suppression degree, as compared with a case where the total certainty factor is high. Further, the acceleration of the vehicle is suppressed with a lower suppression degree as the vehicle speed of the vehicle is higher.