Vehicle Control Device Shift Mode Memory After Neutral
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Solution Overview
Problem
Drivers face inconvenience in selecting a desired shift change mode after returning from the neutral range (N range) in automatic transmissions, as they need to perform additional operations to change the shift change mode, which complicates the process.
Innovation Solution
A vehicle control device that temporarily stores the selected shift change mode when switching from the power transfer range to the power cut-off range and re-selects it when returning to the power transfer range, allowing the driver to maintain the intended mode without additional operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the shift change mode is predetermined after return from the N range, then the device complexity is reduced, but the ease of operation deteriorates because the driver cannot select the desired shift change mode
Solution Approach 1:
The control device stores the shift change mode selected before entering the N range in advance. When the vehicle returns from the N range, the stored mode is automatically restored without requiring additional driver input, thus maintaining operational convenience while simplifying the control logic
2Adaptability or versatility
If the driver performs additional operations to change the shift change mode after return from the N range, then the adaptability is improved, but the loss of time increases due to extra操作步骤
Solution Approach 1:
The control device automatically restores the previously selected shift change mode when returning from the N range, making the system self-serve the driver's intention without requiring additional operations. This eliminates time loss while maintaining the driver's original mode selection preference
Data Source
AI summary
An ECU executes a program including the steps of changing a target shift stage when a current shift change mode is set to an automatic shift change mode and when a driver has intention to change a shift stage, changing a shift range to an N range when he/she has intention for neutral, maintaining the automatic shift change mode when it is determined that he/she does not have intention for neutral but he/she has intention to switch the shift change mode and when such determination is made for the first time after return from the N range, and switching the shift change mode to a manual shift change mode when such determination is not made for the first time.