Shift Position Controller Dynamic N-Check Time
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Solution Overview
Problem
Existing shift position switching controllers in electrical drive-by-wire systems face challenges in reducing shift position switch time to the N position while maintaining responsiveness to other positions, as reducing the N position check time can lead to mis-shifts and deteriorated responsiveness.
Innovation Solution
A shift position switching controller that sets the N position check time based on the current shift position and vehicle speed, ensuring the N position signal remains unchanged for a preset time before switching, and adjusts check times dynamically to prevent mis-shifts and maintain responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the N position check time is reduced, then the shift position switch time to N position is reduced, but the responsiveness to other positions (e.g., R position) deteriorates
Solution Approach 1:
The N position check time is made dynamically adjustable based on the current shift position and vehicle speed. When in D position with vehicle speed ≥ 0 km/h, the check time is set to a shorter first value to enable faster switching to N position. When in other positions or at zero speed, a longer second value is used to maintain responsiveness to other position changes. This dynamic adjustment resolves the contradiction by adapting the check time to operational context.
Solution Approach 2:
The patent changes the parameter of N position check time based on operating conditions (current shift position and vehicle speed). By setting different check time values (first value when in D position with speed ≥ 0, second value otherwise), the system optimizes the balance between fast N-position switching and maintained responsiveness to other positions, resolving the technical contradiction.
2Loss of time
If the N position check time is reduced, then the shift position switch time to N position is reduced, but mis-shifts occur
Solution Approach 1:
The check time is dynamically adjusted based on current shift position and vehicle speed. When in D position with vehicle speed ≥ 0 km/h, a shorter first value is used. When in other positions or at zero speed, a longer second value is used. This dynamic adaptation allows fast switching under appropriate conditions while maintaining reliability under conditions where mis-shifts are more likely.
Solution Approach 2:
The patent changes the N position check time parameter based on operating conditions to balance speed and reliability. By setting the check time to a shorter first value when in D position with speed ≥ 0, and a longer second value otherwise, the system achieves fast switching when safe while preventing mis-shifts when conditions are less certain.
Data Source
AI summary
A shift position switching controller determines whether the responsiveness for switching the shift position to an other-than-N position will be affected by a reduction of an N position check time and keeps the N position check time unchanged from a normal value if a current shift position is a D position or if a vehicle speed is equal to or greater than a preset value. Alternatively, the shift position switching controller determines whether the responsiveness of the controller will be affected by reducing the N position check time, and sets the N position check time to a shorter-than-normal value if the current shift position is a D position and the vehicle speed is equal to or greater than the preset value.