Automatic Transmission Shift Torque Regulation for Shock Suppression
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Solution Overview
Problem
Existing vehicle gear-shifting control systems experience torque shocks due to undesirable irregularities in the waveform of front-rear G-force, leading to discomfort for the driver, and prolonged gear-shifting times to mitigate these shocks result in a worsening traveling feeling.
Innovation Solution
A vehicle gear-shifting control apparatus that calculates and adjusts the input torque based on relational expressions considering the automatic transmission's inertia, allowing for precise control of gear-shifting time and output torque to minimize torque shocks while maintaining a comfortable driving experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the amount of temporary increase or decrease of AT input torque is increased to suppress torque shock, then torque shock suppression is improved, but undesirable irregularities are created in the AT output torque waveform causing unnecessary fluctuations
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the amount of torque regulation based on the actual gear-shifting time. The control amount is modified according to the relationship between actual gear-shifting time and target gear-shifting time, allowing the system to optimize torque shock suppression while preventing waveform irregularities. This is achieved by changing the torque regulation parameters in real-time based on measured gear-shifting characteristics.
Solution Approach 2:
The patent implements feedback control by measuring the actual gear-shifting time and using this information to adjust the torque regulation amount. The system continuously monitors the gear-shifting process and modifies the AT input torque regulation based on the feedback from actual shifting time measurements, creating a closed-loop control system that prevents undesirable waveform irregularities while suppressing torque shocks.
2Object-affected harmful factors
If gear-shifting time is prolonged to suppress torque shock, then torque shock suppression is improved, but traveling feeling deteriorates
Solution Approach 1:
The patent changes the torque regulation parameters dynamically based on the actual gear-shifting time. By adjusting the torque regulation amount according to the relationship between actual and target gear-shifting times, the system achieves effective torque shock suppression without unnecessarily prolonging gear-shifting time, thereby maintaining good traveling feeling.
Solution Approach 2:
The patent applies dynamics by making the torque regulation amount variable rather than fixed. The control system dynamically adjusts the torque regulation based on real-time gear-shifting conditions and measured actual gear-shifting time, allowing optimal performance across different operating conditions while preventing both torque shocks and deterioration of traveling feeling.
3Device complexity
If torque-regulating control is executed with fixed control amount, then control simplicity is maintained, but inadequate suppression of torque shock occurs under varying engine states
Solution Approach 1:
The patent transforms the fixed torque regulation control into a dynamic control system that automatically adjusts the control amount based on actual gear-shifting time. This dynamic adjustment mechanism ensures reliable torque shock suppression across varying engine states without requiring complex manual intervention or overly complicated control logic.
Solution Approach 2:
The control system performs self-adjustment by automatically modifying the torque regulation amount based on measured actual gear-shifting time. The system serves itself by using its own measurements to optimize its control parameters, eliminating the need for external adjustment mechanisms while maintaining both simplicity and reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively suppresses torque shocks and ensures a smooth gear-shifting process, preventing discomfort to the driver while avoiding prolonged gear-shifting times, thus enhancing the overall traveling feeling.
Implementation Method 1
depending on specifications of the automatic transmission such as inertia in the automatic transmission, undesirable irregularities are created in the AT output torque
Data Source
AI summary
A vehicle gear-shifting control apparatus is equipped with an engine, an automatic transmission, and a controller which changes a shift stage by outputting a gear-shifting signal in accordance with the rotation speed of an input shaft to the automatic transmission. The controller executes a torque-regulating control of temporarily increasing or decreasing an input torque input to the input shaft during a shift-change, and when executing the control, determines whether or not a target increase/decrease amount of the input torque can be realized based on calculation results of a target output torque and a target gear-shifting time, executes the control to realize the target amount when it is determined that the target amount can be realized, and executes the control based on an allowable gear-shifting time set in advance to be longer than the target gear-shifting time when it is determined that the target amount cannot be realized.