Automatic Transmission Control Apparatus for Dynamic Gear Shift Timing
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Solution Overview
Problem
Existing automatic transmission control systems indiscriminately use a fixed time period to switch from manual gear-shift mode to automatic gear-shift mode, failing to consider vehicle driving conditions and driver intentions, which affects convenience and accuracy in gear shifting.
Innovation Solution
A control apparatus that adjusts the time period for maintaining manual gear-shift mode based on driver inputs, gear position, and steering angle, setting shorter times for up-shift operations and longer times for down-shift operations, and pausing timer counting during turns to accurately reflect driver intentions and enhance convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed time period is used to maintain manual gear-shift mode, then the control system is simple, but it cannot accurately reflect driver intentions under different driving conditions
Solution Approach 1:
The patent applies dynamics by making the time period for maintaining manual gear-shift mode variable rather than fixed. The control unit dynamically adjusts the time period based on detected driving conditions (accelerator depression state, steering angle, vehicle speed), allowing the system to adapt to different driver intentions in different contexts while maintaining a relatively simple overall control structure.
Solution Approach 2:
The patent changes the parameter of time period duration based on different driving conditions. Specifically, it extends the time period when the accelerator is depressed or during turns, and shortens it when the accelerator is released, thereby accurately reflecting driver intentions without requiring complex additional hardware.
2Reliability
If the time period for maintaining manual gear-shift mode is extended, then driver intention is better reflected, but the system responds slower to return to automatic mode when needed
Solution Approach 1:
The patent dynamically changes the time period parameter based on real-time driving conditions. When the accelerator is depressed indicating active driving, the time period is extended for reliable manual mode maintenance. When the accelerator is released suggesting passive driving, the time period is shortened for faster response to return to automatic mode, thus balancing reliability and response speed.
Solution Approach 2:
The system uses dynamics to adjust the time period duration according to the driver's operational state. The control unit continuously monitors accelerator depression and steering angle, dynamically extending or shortening the manual mode maintenance period to match the driver's intent, ensuring both reliability and appropriate response speed.
3Measurement precision
If manual gear-shift mode is maintained for a long time, then driver intention is accurately reflected, but unnecessary mode switching occurs during transient operations like turns
Solution Approach 1:
The patent changes the time period parameter based on steering angle detection. When the steering angle exceeds a threshold indicating a turn operation, the time period is extended to prevent premature mode switching during transient operations. When the steering angle is within normal range, the time period returns to standard duration, avoiding unnecessary mode maintenance and ensuring operational convenience.
Solution Approach 2:
The control unit dynamically adjusts the manual mode maintenance period based on real-time steering angle detection. During turns when steering angle is large, the system extends the time period to accurately reflect that the driver may need manual control during the maneuver. During normal driving with small steering angles, the system uses standard timing to maintain ease of operation and avoid unnecessary mode persistence.
Data Source
AI summary
An apparatus for controlling automatic transmission includes: an automatic gear-shift mode for automatically selecting a gear position based on a driving condition of a vehicle; and a manual gear-shift mode for selecting the gear position based on an output of an up-shift instructing unit or a down-shift instructing unit, and sets a predetermined time period for maintaining the manual gear-shift mode when the up-shift instructing unit is operated, to be shorter than the predetermined time period when the down-shift instructing unit is operated, when the gear position is at or higher than a predetermined gear position.