Hot-wire type air flow meter for internal combustion engine
US6752014B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 2000 |
| Grant date | Jun 22, 2004 |
| Priority date | — |
| Expiry date | Sep 1, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/696
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A hot-wire type air flow meter for an internal combustion engine has an exothermic resistor film provided on a thin portion formed on a silicon substrate and a control circuit for controlling a voltage to be applied to the resistor film or a current to be supplied. The resistor film is arranged in a suction pipe of the internal combustion engine and heat is emitted to an air through the resistor film. In the case where a liquid droplet is deposited onto the resistor film, the control circuit controls the applied voltage to a value smaller than a voltage which is applied to the resistor film at the time of measuring a maximum specified measuring range or controls the supply current to a value smaller than a current flowing in the resistor film at the time of measuring the maximum specified measuring range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.