Measuring and testing – Test stand – For engine
Patent
1988-01-19
1989-01-24
Myracle, Jerry W.
Measuring and testing
Test stand
For engine
324169, G01M 1500
Patent
active
047993804
ABSTRACT:
An engine rotation speed detecting apparatus comprises circuitry for sensing the state of operation of an engine, circuitry for setting a plurality of respectively different masking periods of time, circuitry for detecting an ignition signal lasting for a period of time longer than any one of the plural masking periods of time thereby detecting an ignition period defined between adjacent ignition signals, and circuitry for computing the rotation speed of the engine on the basis of the detected ignition period, one of the plural masking periods of time being selected according to the result of sensing by the operation state sensing circuitry.
Sakamoto Masahide
Suzuki Toru
Watanabe Akihito
Hitachi , Ltd.
Hitachi Automotibe Engineering
Myracle Jerry W.
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