Gas flow measuring apparatus
US4399697A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1981 |
| Grant date | Aug 23, 1983 |
| Priority date | — |
| Expiry date | Mar 24, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/698
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gas flow measuring apparatus for measuring intake air flow for an automobile engine having an electrical heater resistive member, and first and second temperature dependent resistive members. The first resistive member is located so as to be well influenced by heat from the heater resistive member, while the second resistive member is located so as to be little influenced by the same. The measuring apparatus measures a gas flow rate by using an output signal from a voltage dividing circuit as a series circuit of the first and second resistive members. In the gas flow measuring apparatus, a heater film resistive member is deposited on a first support member by an evaporation depositing or printing process, and is further covered with electric insulating material such as glass. The first resistive member is formed on the heat resistive member, with the insulating material interposing therebetween, whereby the close proximity of the heater resistive member to the first resistive member is realized, and the second resistive member is formed on a second support member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.