Vehicle Door Unlatch Timing Control After Lock Sensor Detection
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Solution Overview
Problem
Existing vehicle door opening devices may incorrectly detect the switching of the unlatch switch before the door lock device is fully switched to the unlocked state, leading to the latch mechanism not being transitioned to the unlatched state when the time from user contact with the lock sensor to handle operation is too short.
Innovation Solution
A vehicle door opening device with a first operation member to unlock the door lock device and a second operation member to unlatch the latch mechanism, where the second operation is only allowed to unlatch when a predetermined time has elapsed after the first operation, ensuring synchronized state transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the user quickly pulls the handle grip after touching the lock sensor plate, then the door opening operation is completed faster, but the door lock device may not have switched to the unlocked state yet when the unlatch switch is detected, causing the latch mechanism to fail to unlatch
Solution Approach 1:
The system performs preliminary detection of the first operation (lock sensor plate contact) and prepares the door lock device for unlocking before the second operation (handle pull) is completed. The control device monitors the timing relationship between the two operations and ensures the lock state transitions are properly synchronized before allowing latch unlatching, preventing the reliability issue while maintaining fast operation.
2Reliability
If the system waits for complete state transition before allowing unlatch operation, then switching reliability is improved, but the door opening response time increases
Solution Approach 1:
The control device continuously monitors the operational states of both the door lock device and latch mechanism, and uses this feedback to determine the appropriate timing for allowing unlatch operations. By detecting the first operation on the lock sensor plate and timing the second operation on the handle grip, the system provides real-time feedback control that ensures reliability without requiring excessive waiting time.
Solution Approach 2:
The system dynamically adjusts its control logic based on the timing relationship between the two operations. When the second operation occurs within the predetermined time after the first operation, the system allows the latch to unlatch; otherwise, it maintains the latched state. This dynamic response optimizes both reliability and response time.
3Ease of operation
If the system allows unlatch operation immediately when the second operation member is actuated, then the ease of operation is improved, but incorrect unlatching may occur when the door lock is still in locked state
Solution Approach 1:
The system performs preliminary detection and timing analysis of the first operation (lock sensor contact) before allowing the second operation (handle pull) to trigger unlatching. This preliminary action ensures that the door lock device has had sufficient time to transition to the unlocked state, preventing incorrect unlatching while maintaining ease of operation through intuitive handle design.
Solution Approach 2:
The control device acts as an intermediary between the two operation members, mediating the interaction by detecting the timing relationship between lock sensor contact and handle grip pull. It uses this intermediate detection to determine whether to permit the latch unlatching, preventing incorrect operation while maintaining user convenience.
Data Source
AI summary
A vehicle door opening device includes a lock control device configured to switch a door lock device to an unlocked state when an operation on a first operation member is detected, and a latch control device configured to: when an operation on a second operation member is detected while the door lock device is in the unlocked state, switch the latch mechanism to an unlatched state; when the operation on the second operation member is detected while the door lock device is in a locked state and when the operation on the first operation member is detected, switch the latch mechanism to the unlatched state; and, when the operation on the second operation member is detected while the door lock device is in the locked state and when the operation on the first operation member is not detected, maintain the latch mechanism in a latched state.