| 摘要 |
PROBLEM TO BE SOLVED: To precisely measure moment of inertia of an engine without affected by loss due to a profile of engine rotational speed variation and without extremely changing the rotational speed of the engine. SOLUTION: The rotational speed of the engine 1 is made approximately constant by an engine control part 11, and output torque of a dynamometer is excited and controlled by a normal distribution random number signal as a torque command of a dynamometer control part 12. A detection part 13 records data of axial torque T<SB>tm</SB>generated at a coupling shaft 4 in the excitation control and the rotational speedω<SB>dy</SB>of the dynamometer for a prescribed time. An operation unit 14 estimates a transfer function with the axial torque T<SB>tm</SB>as an input and the rotational speed of the dynamometer or the rotational speed of the engine as an output from the data, acquires a gain characteristic (ω, g) of a gain g with respect to the angular frequencyωfrom the transfer function, and acquires the moment of inertia of the engine from the gain characteristic by an operation. The excitation control may be performed by a sine wave. COPYRIGHT: (C)2007,JPO&INPIT
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