Honda Motor Co., Ltd.

Nobuaki Takeo

Takashi Kato

Atsushi Kurauchi

Mitsuo Muraoka

Satoshi Furuhashi

Akifumi Ikeda

A rotation-speed-calculation-apparatus includes: a detector configured to detect a rotation-angle of an engine; and a CPU and a memory coupled to the CPU. The CPU is configured to perform: calculating an engine-speed each time the detector detects a predetermined-angle based on a time-period required for the engine to rotate the predetermined-angle; and determining whether the engine-speed calculated is in a low-rotation range equal to or lower than a threshold-value or in a high-rotation range over the threshold-value. The CPU is configured to perform: the calculating including: calculating the engine-speed based on a time-period required for the engine to rotate a first-predetermined-angle when it is determined that the engine-speed is in the low-rotation range; and calculating the engine-speed based on a time-period required for the engine to rotate a second-predetermined-angle smaller than the first-predetermined-angle when it is determined that the engine-speed is in the high-rotation range.

Rotation speed calculation apparatus

A control device is provided that can obtain high precision sensor outputs by way of a simple configuration without providing additional components. A control deviceincludes: an internal groundand a power circuit, in which the internal groundis divided into a high-power internal groundprovided inside of a housingon a side of connection part, and a low-power internal groundprovided inside of the housingat a position having an electrical distance from the connection partthat is farther than the ground. The ground of the control targetand the circuitare connected to the ground, the ground of the sensoris connected to a mounting parthaving an electrical distance from the connection partthat is farther than the ground

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Wako, Japan

Nobuaki Takeo