Angular velocity/angular acceleration calculator, torque...

Details Angular velocity/angular acceleration calculator, torque... Angular velocity/angular acceleration calculator, torque...

2011-06-14

2011-06-14

Kirkland, III, Freddie (Department: 2855)

Measuring and testing

Internal combustion engine or related engine system or...

Engine speed

C073S114150, C073S114240

Reexamination Certificate

active

07958779

ABSTRACT:
An angular velocity/angular acceleration calculator of the crankshaft in an internal combustion engine includes a crank angle detection device, a crank angle correction device, and an angular velocity/angular acceleration calculation device. The crank angle detection device detects a crank angle in the internal combustion engine and a time at the crank angle. The crank angle correction device corrects the crank angle and the time thus detected to an equiangular crank angle and a time corresponding thereto. The angular velocity/angular acceleration calculation device calculates an angular velocity and an angular acceleration of the crankshaft by converting a function of the time with respect to the crank angle that are corrected by the crank angle correction device so as to be regarded as a periodic function, and utilizing the discrete Fourier transform of the converted function.

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patent: 6873930 (2005-03-01), Hirn
patent: 7530261 (2009-05-01), Walters
patent: 2005-61371 (2005-03-01), None

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