Apparatus for measuring air flow in the air intake manifold of an internal combustion engine
US4343183A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 4, 1980 |
| Grant date | Aug 10, 1982 |
| Priority date | — |
| Expiry date | Feb 4, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/698
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for measuring the flow of air through the air intake manifold of an internal combustion engine. A controller regulates current to a bridge circuit having a first temperature-dependent resistor which is disposed in the air flow within the manifold, and whose resistance is a function of the current flow therethrough and the flow rate and temperature of the air. A second fast-responding temperature-dependent resistor, which is disposed in the manifold and supplied with a very small current so that its resistance is essentially a function of the air temperature, provides an air temperature signal which is amplified and/or differentiated and supplied to the controller as a precise correction signal for the bridge diagonal voltage signal which is also an input signal to the controller, so that the current output of the controller is an accurate measure of the air flow.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.