Vehicle Park-Lock Control for Key-Off Neutral Parking Adjustment
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Solution Overview
Problem
Existing vehicle park lock mechanisms automatically activate when shifting from N-range to P-range during key-off operation, preventing unintentional vehicle movement but making it inconvenient for parking space adjustments, as the park lock mechanism remains active even when not needed.
Innovation Solution
A vehicle park lock control method that allows operators to select whether to activate the park lock mechanism in response to key-off operations when in the N-range position, enabling reliable restriction or avoidance of vehicle movement by activating the park lock mechanism only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the park lock mechanism is activated in response to key-off operation when in the N-range position, then the vehicle is prevented from unintentionally moving while parked, but it becomes impossible to push and move the vehicle for parking space adjustment
Solution Approach 1:
The system dynamically adjusts the park lock activation behavior based on the selected range position. When P-range is selected, the park lock activates on key-off to prevent unintentional movement. When N-range is selected, the park lock remains inactive allowing manual pushing. This dynamic adaptation resolves the contradiction by making the system behavior flexible rather than fixed.
Solution Approach 2:
The system changes the operational parameter of the park lock mechanism based on the range selector position. The key-off operation triggers different outcomes depending on whether P-range or N-range is selected, effectively using parameter change (range position) to control the park lock activation state and resolve the contradiction between safety and maneuverability.
2Reliability
If the park lock mechanism is always activated on key-off in N-range position, then vehicle safety is improved, but operational flexibility is reduced
Solution Approach 1:
The system transitions from a static always-activate behavior to a dynamic conditional behavior. The park lock activation is now determined by the real-time range selector position, allowing the system to adapt between safety-critical scenarios (P-range) and flexibility-needed scenarios (N-range).
Data Source
AI summary
A vehicle park lock control method is presented with range positions including a P-range position and an N-range position in each of which a driving force is prevented from being transmitted to a driving wheel of a vehicle. A park lock mechanism is activated when in the P-range position. An operator is allowed to select whether or not to cause the park lock mechanism to be activated in response to key-off operation when in the N-range position. In response to continuous shifting of a range selector to one or more specific ones of the range positions, the park lock mechanism is prevented from being activated in response to key-off operation when in the N-range position.