Shift Range Control Preventing Drive State During Door Open
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Solution Overview
Problem
In shift-by-wire type transmission systems, there is no effective method to ensure the shift range remains in a non-drive state when the door is open, as mechanical fixation is not possible, leading to potential unintended shifting when the door is still open due to signal delays.
Innovation Solution
A door control system with a shift range control apparatus that includes a drive range control part, a non-drive range control part, and a signal output part, which outputs a shift range signal to a door control apparatus to prevent shifting to a drive range when the door is open, using a delay mechanism and shift lock continuation signal to ensure the shift range remains in a non-drive state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical shift lever fixation method is used, then the shift range can be reliably fixed in a non-drive state when the door is open, but this approach is incompatible with shift-by-wire transmission systems that lack mechanical fixation mechanisms
Solution Approach 1:
The patent replaces the mechanical shift lever fixation system with an electronic control system. The shift-by-wire transmission uses electronic signals instead of mechanical linkages, and the fixation function is achieved through software control logic that monitors door status and prevents shift range changes when the door is open, thereby maintaining reliability while enabling compatibility with modern shift-by-wire systems.
Solution Approach 2:
The patent introduces an intermediary control unit (ECU) that acts as a mediator between the door sensor and the transmission control system. This intermediary processes door status signals and generates appropriate shift range control commands, bridging the gap between mechanical door latching and electronic transmission control without requiring direct mechanical coupling.
2Adaptability or versatility
If electronic control is used to manage shift range without mechanical fixation, then compatibility with shift-by-wire transmission is achieved, but signal delays and manipulation timing issues may cause unintended shifting to drive range
Solution Approach 1:
The patent implements preliminary action by checking the door status signal before allowing any shift range manipulation. The control unit proactively verifies that the door is fully closed and latched before permitting transitions to drive range, preventing unintended shifting caused by signal delays or timing issues. This advance verification ensures reliability while maintaining electronic control flexibility.
Solution Approach 2:
The patent employs feedback mechanisms where the control unit continuously monitors door status signals and transmission shift range signals, and adjusts control commands based on this feedback. When the door is detected as open, the system provides feedback to block shift range changes; when the door is closed, feedback permits normal shifting operations, thereby maintaining reliability through continuous monitoring and adaptive control.
Data Source
AI summary
A door control system with transmission control includes a transmission control apparatus for controlling a shift-by-wire type transmission and a door control apparatus for controlling opening and closing of a door of a vehicle. The door control apparatus outputs a shift lock request to the transmission control apparatus when a door switch is manipulated to open. The door control apparatus checks whether a shift range signal is a non-drive range by setting a delay from the output of the shift lock request. When the shift range is the non-drive range, the door control apparatus opens the door. When the door switch is manipulated to close, the transmission control apparatus does not output the shift lock request and closes the door.