Measuring and testing – Simulating operating condition – Marine
Reexamination Certificate
2005-12-20
2005-12-20
Gray, David (Department: 2855)
Measuring and testing
Simulating operating condition
Marine
C073S488000, C701S029000, C701S051000
Reexamination Certificate
active
06976388
ABSTRACT:
A condition of impaired speed and torque control of a parallel electrically variable transmission due to factors beyond nominal modeling and estimation errors is diagnosed under low speed operation. The transmission includes at least one electric machine and a motor torque controller for regulating the transmission input speed and output torque. The motor torque controller includes an open-loop control path based on predetermined torques and accelerations and a closed loop control path based on input speed error. The presence of a larger than expected closed-loop correction magnitude, combined with low output speed and one or more other conditions is used to diagnose a condition of potential torque error, in which case the transmission control is altered to prevent unwanted operation.
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patent: 6358173 (2002-03-01), Klemen et al.
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Heap Anthony H.
Hsieh Tung-Ming
Hubbard Gregory A.
Steinmetz Todd M.
Tao Xuefeng T.
DeVries Christopher
General Motors Corporation
Gray David
Kirkland, III Freddie
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