Automatic Manual Transmission Clutch Control Method
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Solution Overview
Problem
Current automatic manual transmissions face challenges in closing the clutch quickly and smoothly, especially in double clutch gearboxes, leading to increased shifting time and torque dispersion, which affects vehicle performance and comfort.
Innovation Solution
A control method that determines a torque target for each clutch during gear shifts, using a combination of closed-loop and open-loop control to manage the clutch actuation, ensuring a smooth and rapid connection between the engine and gearbox sides by adjusting the clutch opening and closing speeds based on speed differences and acceleration targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the clutch is closed very slowly to obtain a smooth connection between rotation speeds, then oscillations in the transmission are avoided, but the time needed to shift gears increases
Solution Approach 1:
The patent applies dynamics by making the clutch closing speed variable rather than constant. The control system dynamically adjusts the clutch closing speed based on real-time monitoring of rotation speed differences between engine side and gearbox side. When the rotation speed difference is large, the clutch closes faster; when the difference approaches zero, the closing speed is reduced to ensure smooth connection, thereby optimizing both shifting time and connection smoothness
Solution Approach 2:
The patent implements feedback control by continuously monitoring the rotation speeds of both clutch sides and using this information to adjust the clutch closing process. The control unit receives feedback on the rotation speed difference and modulates the actuator command accordingly, creating a closed-loop control system that adapts the clutch closing behavior to actual operating conditions
2Productivity
If the clutch closing speed is increased to reduce shifting time, then gear shifting performance improves, but oscillations and vibrations are triggered in the transmission
Solution Approach 1:
The system dynamically adjusts the clutch closing profile based on real-time rotation speed measurements. Rather than using a fixed slow closing speed, the control system optimizes the closing speed at each moment according to the current rotation speed difference, enabling faster overall closing while avoiding violent connections that cause oscillations
Solution Approach 2:
The patent changes the operational parameters of the clutch closing process by adjusting the closing speed as a variable parameter rather than a constant. The control system modifies the actuator command to achieve optimal closing speeds that prevent oscillations while minimizing shifting time, effectively using parameter optimization to resolve the contradiction
3Stability of the object's composition
If torque transmission is controlled at small slip values in an oil bath clutch, then smooth connection is achieved, but the control becomes very complicated due to high dispersion
Solution Approach 1:
The patent replaces complex mechanical torque control mechanisms with a simpler electronic control system. Instead of relying on complex mechanical arrangements to control torque at small slip values, the system uses electronic actuators and control algorithms to achieve smooth torque transmission, thereby reducing overall system complexity while maintaining control precision
Solution Approach 2:
The control system manages torque transmission by dynamically adjusting operational parameters rather than relying on complex mechanical configurations. By changing the actuator command parameters based on rotation speed feedback, the system achieves smooth torque control at small slip values with simpler overall system architecture
Data Source
AI summary
A control method for closing a clutch in an automatic manual transmission during a gear shifting to pass from a current gear to a successive gear; the automatic manual transmission has a gearbox provided with at least one primary shaft and at least one secondary shaft connected to driving wheels, and at least one clutch interposed between the primary shaft of the gearbox and a drive shaft of an engine; the control method includes, during the closing of the clutch, when the rotation speed of an engine side of the clutch is close to the rotation speed of a gearbox side of the clutch, the steps of: determining a speed difference between the rotation speed of the engine side of the clutch and the rotation speed of the gearbox side of the clutch; determining an acceleration target according to the speed difference; and determining a target torque to be transmitted through the clutch according to the acceleration target.