发明名称 |
Tachometer based on electrical ripple and calibrated by mechanical engine signals |
摘要 |
The tachometer includes a microphone for disposition next to the exhaust of the vehicle and an accelerometer for disposition adjacent to its engine. A selected one of the outputs is connected to an ADC which provides digital samples to a central processing unit. Also, the ripple from the battery is sampled and provided to the CPU. The CPU calculates a constant representing the relationship of the frequencies of the ripple samples and the mechanical samples and responds to the ripple samples and the constant to provide output signals corresponding to the speed of the engine. The speed is displayed.
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申请公布号 |
US5640086(A) |
申请公布日期 |
1997.06.17 |
申请号 |
US19950522750 |
申请日期 |
1995.09.01 |
申请人 |
SUN ELECTRIC DEUTSCHLAND GMBH |
发明人 |
RENTSCH, WOLFGANG;POHL, OLAF |
分类号 |
G01P3/489;F02D41/34;F02D45/00;G01P3/44;G01P3/48;G01P21/02;(IPC1-7):G01P3/48 |
主分类号 |
G01P3/489 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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