Clutch Controller Torque Stabilization Dynamics
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Solution Overview
Problem
Conventional clutch control technologies in semi-automatic vehicles often fail to maintain appropriate torque transmission, leading to riding discomfort due to excessive torque fluctuations during clutch engagement, either causing shocks from sudden torque increases or excessive deceleration from prolonged low torque transmission.
Innovation Solution
A clutch controller system that includes an actuator and a control unit to manage the degree of engagement between the drive-side and driven-side members, using actual and request torque measurements to perform specific control processes, adjusting the engagement based on engine operation ranges to maintain optimal torque transmission and stabilize engine speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the half-clutch state is discontinued early based on rotational speed difference control, then the clutch engagement speed is improved, but torque transmission becomes unstable causing shocks
Solution Approach 1:
The control method dynamically switches between two control modes (first control process based on torque difference, and second control process based on engine torque) depending on the engine operation range. This dynamic adaptation allows the system to optimize clutch engagement speed in certain ranges while maintaining torque transmission stability in others, resolving the contradiction between engagement speed and torque stability.
2Stability of the object's composition
If the half-clutch state is maintained until rotational speed difference is almost zero, then torque transmission stability is improved, but vehicle deceleration becomes excessive
Solution Approach 1:
The system dynamically selects the control process based on engine operation range. In the first operation range, it uses the first control process that prioritizes torque stability. In the second operation range, it switches to the second control process that prevents excessive vehicle deceleration, thus resolving the contradiction between torque stability and vehicle speed maintenance.
3Measurement precision
If the actuator is actuated based on torque difference to approximate request torque, then torque control precision is improved, but engine speed becomes unstable in certain operation ranges
Solution Approach 1:
The control unit dynamically switches control processes based on engine operation range. In the first operation range, it applies the first control process that actuates the actuator based on torque difference for precise torque control. In the second operation range where engine torque increases with engine speed, it switches to the second control process that actuates based on engine torque to maintain engine speed stability, thus resolving the contradiction between torque precision and engine speed stability.
4Stability of the object's composition
If the actuator is actuated such that actual transmission torque approximates engine torque, then engine speed stability is improved, but torque transmission accuracy deteriorates
Solution Approach 1:
The system dynamically selects the appropriate control process based on engine operation range. In the second operation range where engine torque increases with engine speed, it applies the second control process that prioritizes engine speed stability. In the first operation range, it switches to the first control process that prioritizes torque transmission accuracy, thus resolving the contradiction between engine speed stability and torque transmission accuracy.
Data Source
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AI summary
The present invention relates to a vehicle having an engine and a clutch means provided in a torque transmission path, said clutch means comprising an actuator for changing the degree of engagement between a drive-side member and a driven-side member of the clutch, the members being located downstream of the engine in the torque transmission path, and a clutch controller, said clutch controller comprising: an actual torque obtaining section for obtaining torque transmitted from the drive-side member to a downstream mechanism of the torque transmission path as actual transmission torque, the downstream mechanism including the driven-side member; a request torque obtaining section for obtaining torque determined based on an accelerator operation as request transmission torque; an engine torque obtaining section for obtaining torque outputted from the engine as engine torque; and a control unit, said control unit being configured to determine an operation range of the engine, and, based on the determination results, to perform either a first control process or a second control process to actuate the actuator, both control processes being dependent on torque difference.