Vehicle Shift Control Device for Emergency Stop and Auto-P Prioritization
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Solution Overview
Problem
The existing vehicle shift control devices face challenges in accurately reflecting the user's operational intention, particularly when executing emergency stop processes through successive power switch short-presses, leading to confusion between auto-P actions and emergency stop processes, especially at predetermined vehicle speeds.
Innovation Solution
A vehicle shift control device that switches the vehicle state among running, partial power on, and power off states, prioritizing the parking position switch before transitioning to the emergency stop state, and delaying the emergency stop process by a predetermined time to ensure accurate intention reflection and prevent battery drain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If plural-times of successive power switch short-presses are used to execute emergency stop process, then the emergency stop function is enhanced, but the distinction between auto-P action and emergency stop process becomes difficult
Solution Approach 1:
The system performs preliminary judgment of vehicle speed before executing different operations. When vehicle speed is at or below the predetermined speed, the system executes auto-P action (shifting to parking position). When vehicle speed exceeds the predetermined speed, the system executes emergency stop process. This preliminary speed-based differentiation resolves the ambiguity between the two operations.
Solution Approach 2:
The system changes the execution parameter based on vehicle speed condition. At low speeds (≤ predetermined speed), the power switch operation triggers auto-P action. At high speeds (> predetermined speed), the same power switch operation triggers emergency stop process. This parameter-based differentiation allows the same operation to have different meanings based on the vehicle state.
2Reliability
If vehicle state is compulsorily switched to second state during vehicle running, then emergency stop is achieved, but switching to parking position may not be executed due to state transition
Solution Approach 1:
The system executes the parking position switching action before transitioning to the second state (emergency stop state). By performing the parking position switch preliminarily, the system ensures that this action is completed before the state change that might prevent it from executing.
Solution Approach 2:
The system dynamically adjusts the execution sequence based on the detected vehicle speed. When multiple operations are detected during vehicle running, the system first checks if vehicle speed is at or below the predetermined speed. If yes, it executes auto-P action; if no, it executes emergency stop process. This dynamic adjustment ensures appropriate action sequencing.
3Ease of operation
If power switch operation is performed at predetermined vehicle speed or less, then auto-P action is executed, but battery drain may occur due to premature state transition
Solution Approach 1:
The system executes the parking position switching action before transitioning to the second state (emergency stop state). By performing the parking position switch preliminarily, the system ensures that this action is completed before the state change that might prevent it from executing.
Solution Approach 2:
The system changes the execution parameter based on vehicle speed condition. When vehicle speed is at or below the predetermined speed, the power switch operation triggers auto-P action. When vehicle speed exceeds the predetermined speed, the same power switch operation triggers emergency stop process. This parameter-based differentiation allows the same operation to have different meanings based on the vehicle state.
Data Source
AI summary
It is provided a vehicle shift control device electrically switching a shift position between a parking position and a non-parking position, the vehicle being capable of switching a vehicle state among a first state, a second state and a third state, when an operation for switching the vehicle state is performed in the first state, if a vehicle speed is a predetermined speed or less, switching is executed to the parking position and, after completion of the switching, the vehicle state is switched to the third state, whereas when plural-times of the operations are performed successively during the vehicle running, the vehicle state is compulsorily switched to the second state, and when at least one operation of the plural-times of the operations is performed if the vehicle speed is the predetermined speed or less, switching to the parking position is executed prior to switching to the second state.