Method of estimating gas pressure in an engine exhaust manifold
US6658364B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 2001 |
| Grant date | Dec 2, 2003 |
| Priority date | — |
| Expiry date | May 2, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/703
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An improved method of estimating the gas pressure in the exhaust manifold of an internal combustion engine characterizes the engine exhaust system as a restriction, and estimates the exhaust manifold pressure as the gas pressure upstream of the restriction based on calibrated characteristics of the exhaust system and known characteristics of exhaust gas flow through the exhaust system. The estimation is based on a mathematical model that relates the mass flow of gas through the engine exhaust system to the exhaust manifold pressure (i.e., the upstream pressure), the barometric pressure (i.e., the downstream pressure) and the exhaust manifold gas temperature. An estimate of a pressure ratio across the exhaust system is calibrated based on the model parameters, and the exhaust manifold pressure is determined according to the product of the estimated pressure ratio and the barometric pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.