Method of determining barometric pressure for use in an internal combustion engine
US6430515B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1999 |
| Grant date | Aug 6, 2002 |
| Priority date | — |
| Expiry date | Sep 20, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/704
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method is provided for determining the barometric pressure external to an air intake of an internal combustion engine, comprising the steps of: (a) providing a pressure value indicative of an absolute pressure in the intake manifold of the engine; (b) providing a mass airflow value of the airflow into the engine; (c) characterizing a pressure drop across the intake system based on the mass airflow value; and (d) determining a barometric pressure based on the pressure value and the pressure drop, such that the pressure drop is indicative of the pressure differential between the atmospheric pressure and the pressure in the intake manifold. Furthermore, the determination of the barometric pressure may be triggered when the throttle blade reaches a predetermined throttle threshold position which is a function of the rotational speed of the engine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.