Transmission Control Device Cornering Gear-Shift Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional transmission control devices for automatic transmissions often require expensive sensors like bank angle sensors or gyroscopes to determine cornering states, which is impractical and costly, and they fail to adapt gear-shift control to varying cornering conditions effectively.
Innovation Solution
A transmission control device that uses a cornering-state judging part, a modified shift-up table generating part, and a gear-shift controlling part to suppress gear shifts during cornering without expensive sensors, by generating a modified shift-up table based on vehicle speed and throttle opening, allowing gear shifts only when safe, and reverting to a reference table when cornering ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If expensive sensors like bank angle sensors or gyroscopes are used to determine cornering states, then the cornering state detection precision is improved, but the device cost and complexity increase
Solution Approach 1:
The patent replaces expensive sensors with inexpensive existing sensors (throttle opening sensor and vehicle speed sensor) that are already part of the transmission control system. By using these readily available sensors to infer cornering state through judgment maps, the system achieves cornering detection without adding costly components, directly resolving the contradiction between detection precision and device complexity
Solution Approach 2:
The patent introduces cornering-state judgment maps as an intermediary mechanism that translates data from existing sensors (throttle opening and vehicle speed) into cornering state information. These judgment maps act as a mediator that enables indirect detection of cornering state without requiring direct measurement sensors, thereby maintaining detection capability while avoiding expensive hardware additions
2Stability of the object's composition
If gear shift is suppressed during cornering to prevent torque fluctuations, then the vehicle stability is improved, but the gear-shift response time increases
Solution Approach 1:
The patent dynamically adjusts gear-shift control based on real-time cornering state detection. When cornering is detected through the judgment maps, gear shift is suppressed to maintain stability. When cornering ends and normal running state is detected, gear shift control is immediately restored. This dynamic adaptation allows the system to optimize between stability and response time based on actual driving conditions
Solution Approach 2:
The patent implements feedback control by continuously monitoring throttle opening and vehicle speed to determine cornering state through judgment maps. Based on this feedback, the system automatically adjusts gear-shift control - suppressing shifts during detected cornering and restoring normal shift control when cornering ends. This closed-loop feedback mechanism ensures stability during cornering while maintaining quick response when conditions change
3Device complexity
If simple inhibition of gear shift is applied during cornering, then the control simplicity is improved, but the adaptability to various cornering states deteriorates
Solution Approach 1:
The patent applies local quality by creating different judgment maps for different cornering scenarios. The system divides running states into acceleration range, cruise range, deceleration range, and throttle-off range, with specific judgment criteria for each. This allows the system to adapt gear-shift suppression control to various cornering states (different vehicle speeds, bank angles, and acceleration conditions) while maintaining relatively simple control logic within each local condition
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Object A transmission control device capable of performing gear-shift suppression control that is according to various cornering states, without using an expensive sensor is provided. Solving Means An ATM control device (18) for an ATM (automatic manual transmission) (16) automatically changing a shift position by use of an actuator includes: a cornering-state judging part (110) judging whether its vehicle has transitioned to a cornering state from a normal running state; a modified shift-up table generating part (130) generating a modified shift-up table when the vehicle is judged to have transitioned to a cornering state, the modified shift-up table making a shift-up more difficult to occur than a reference shift-up table (131) does; and a gear-shift controlling part (100) performing gear-shift control by using the reference shift-up table (131) during the normal running state, whereas performing gear-shift control by using the modified shift-up table instead of the reference shift-up table (131) when the vehicle is judged to have transitioned to a cornering state.