Fluid Torque Converter Switching for Transmission Shock Control
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Solution Overview
Problem
When a fluid torque converter is locked, inherent gaps between transmission mechanisms cause impacts and shocks during torque direction changes, affecting vehicle smoothness and increasing fuel consumption.
Innovation Solution
A method and device for controlling state switching of the fluid torque converter by accurately recognizing target operating conditions to briefly open and then relock the converter, absorbing shocks and reducing jitter while minimizing fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the fluid torque converter is kept in locked state to improve transmission efficiency and reduce fuel consumption, then fuel economy is improved, but transmission shocks and vehicle jitter occur when torque transmission direction changes
Solution Approach 1:
The control method employs periodic action by temporarily opening the lock-up clutch for a predetermined duration when torque transmission direction change is detected, then reclosing it after the transient shock subsides. This periodic open-close action allows the system to maintain locked state for fuel efficiency while periodically disengaging to absorb transmission shocks, resolving the contradiction between fuel economy and transmission smoothness
Solution Approach 2:
The control unit acts as an intermediary between the locked state requirements and shock absorption needs. By detecting torque transmission direction changes and mediating the lock-up clutch state transitions, the control unit temporarily switches the clutch from locked to unlocked state during direction changes, then returns it to locked state, thereby eliminating transmission shocks while maintaining overall locked operation for fuel efficiency
2Object-affected harmful factors
If the lock-up clutch is opened to absorb transmission shocks, then transmission smoothness is improved, but fuel consumption increases due to loss of mechanical linkage
Solution Approach 1:
The lock-up clutch operates in a periodic manner, maintaining locked state for fuel efficiency and temporarily opening only when torque transmission direction change is detected. This selective periodic opening minimizes the duration of disengagement, thereby reducing fuel consumption impact while still achieving shock absorption and eliminating vehicle jitter during critical moments
Solution Approach 2:
The control method changes the operational parameters of the lock-up clutch dynamically - switching from locked to unlocked state based on detected torque transmission direction changes. This parameter change allows the system to adapt to transient conditions causing vehicle jitter while maintaining the locked parameter for fuel efficiency during normal operation, thus resolving the contradiction between smoothness and fuel consumption
Data Source
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AI summary
Disclosed are a method and device for controlling the state switching of a fluid torque converter, a vehicle and a storage medium, the method comprising: obtaining a target instruction when the torque converter of the vehicle is in a locked state, the target instruction triggering a change in the torque transmission direction of a transmission system of the vehicle; obtaining a state parameter, and determining whether the current vehicle is in a target operating condition according to the state parameter; and if the current vehicle is in the target operating condition, switching the fluid torque converter to an open state, and switching the torque converter back to the locked state after maintaining the open state for a preset period of time. The present disclosure accurately recognizes a target operating condition, controls the hydraulic torque converter to open quickly and briefly under the target operating condition, absorbs the shock caused by the impact of a transmission component when the torque transmission direction of the transmission system is switched, and reduces the vibration of the vehicle. By controlling the fluid torque converter to close again after briefly opening, the fuel consumption is reduced and on the basis of ensuring fuel economy, the driving experience of the user is improved.