Thermal resistor type air flow measuring apparatus
US6672146B1 · kind B1 · utility
5Cited by
7References
21Claims
0Family size
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Key dates
| Filing date | Aug 4, 2000 |
| Grant date | Jan 6, 2004 |
| Priority date | — |
| Expiry date | Dec 31, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/696
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
To correct properly the error of the thermal resistor type air flow measuring apparatus caused by the pulsation in the intake pipe in detecting the air flow of the internal combustion engine, a thermal resistor is placed in a passage inside the auxiliary air passage into which the reverse flow hardly flows directly and the error caused by the reverse flow is prevented. The existence of the reverse flow is judged by the ratio of the amplitude to the mean value using the maximum value, the minimum value and the mean value of the forward air flow waveform, and the error caused by the increase of the forward air flow is corrected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.