Transmission Mode Return Timing Based on Driver Shift Intent
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Solution Overview
Problem
Drivers may feel dissatisfied with the timing of automatic return to automatic transmission mode, as it can occur before the target gear ratio is achieved during manual mode operation, leading to inappropriate switching between transmission modes.
Innovation Solution
A transmission mode control system that includes a control device with a processor and memory, which switches the transmission mode from manual to automatic based on a set switching time and extends this time when specific driver operations are performed, such as brake input or gear ratio changes, to ensure seamless transitions and driver preference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the transmission mode automatically returns to automatic mode after a predetermined time in manual mode, then the transmission mode switching is automated, but the switching may occur before the target gear ratio is achieved, causing driver dissatisfaction
Solution Approach 1:
The control device monitors gear ratio changes and driver operations (brake input, gear ratio changes) during manual mode operation. Based on this feedback, the control device dynamically adjusts the switching time to extend the manual mode duration when needed, ensuring the automatic return occurs at an appropriate timing that matches driver intent rather than using a fixed predetermined time.
2Reliability
If the switching time is extended based on driver operations, then the mode switching timing accuracy is improved, but the control logic complexity increases
Solution Approach 1:
The control device automatically detects driver intent through monitoring operations such as brake input and gear ratio changes during manual mode. The system self-adjusts the switching time based on these detected operations without requiring additional driver input or complex manual calibration, thereby improving timing accuracy while keeping the control logic manageable through rule-based automatic adaptation.
Data Source
AI summary
A transmission mode control system includes a control device that controls a transmission mode of a vehicle and a first input device that accepts a switching operation of switching from an automatic transmission mode to a manual transmission mode. The control device includes a processor and a memory. The processor executes a process including: switching the transmission mode from the manual transmission mode to the automatic transmission mode when a switching time elapses after an operation of the first input device by a driver of the vehicle; and extending the switching time by a set time when the driver performs, within a post-switching determination time after the switching time elapses, a certain operation that causes a gear ratio to change in the same direction as a change of gear ratio when the gear shift is executed in response to the operation by the driver before the switching time elapses.