ANGULAR VELOCITY/ANGULAR ACCELERATION CALCULATOR, TORQUE ESTIMATOR, AND COMBUSTION STATE ESTIMATOR
First Claim
1. An angular velocity/angular acceleration calculator for a crankshaft in an internal combustion engine, the calculator comprising:
- a crank angle detection device that detects a crank angle in said internal combustion engine and a time at said crank angle;
a crank angle correction device that corrects, in accordance with a predetermined crank angle pitch, said crank angle and said time both detected by said crank angle detection device; and
an angular velocity/angular acceleration calculation device that calculates an angular velocity and an angular acceleration of said crankshaft by converting a function of said time with respect to said crank angle corrected by said crank angle correction device so as to be regarded as a periodic function, and utilizing the discrete Fourier transform of said converted function.
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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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Citations
9 Claims
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1. An angular velocity/angular acceleration calculator for a crankshaft in an internal combustion engine, the calculator comprising:
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a crank angle detection device that detects a crank angle in said internal combustion engine and a time at said crank angle; a crank angle correction device that corrects, in accordance with a predetermined crank angle pitch, said crank angle and said time both detected by said crank angle detection device; and an angular velocity/angular acceleration calculation device that calculates an angular velocity and an angular acceleration of said crankshaft by converting a function of said time with respect to said crank angle corrected by said crank angle correction device so as to be regarded as a periodic function, and utilizing the discrete Fourier transform of said converted function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification