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Closed-loop torque phase control for shifting automatic transmission gear ratios based on friction element load estimation
Closed-loop torque phase control for shifting automatic transmission gear ratios based on friction element load estimation
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机译:基于摩擦元件载荷估算的自动变速齿轮比的闭环转矩相位控制
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摘要
A closed loop shift control apparatus and method based on estimated torque in friction elements controls a torque transfer phase when shifting from a low gear configuration to a high gear configuration for an automatic transmission system. When pressure actuated friction elements are selectively engaged and released to establish torque flow paths in the transmission, estimates of torsional load exerted on the off-going friction element are used to predict the optimal off-going friction element release timing for achieving a consistent shift feel. The estimated torque is preferably calculated by using estimated torque signals generated as a function of speed measurements represented either the engine speed and turbine output speed or transmission output speed and wheel speed under dynamically changing conditions.
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