Fuel control device and method for internal combustion engine
US5215062A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1992 |
| Grant date | Jun 1, 1993 |
| Priority date | — |
| Expiry date | Jul 31, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/0408
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In a fuel control device for an internal combustion engine wherein an estimated pressure (Pi) in the engine intake manifold is calculated by digital filtering an output signal from a H/W sensor by making use of a difference equation, an air flow rate (Qc) at the engine cylinder port is estimated based upon a detected engine rotating number (N) and the calculated estimated pressure (Pi) by retrieving a value of air flow rate from a map defined by the engine rotating number (N) and the estimated pressure (Pi) in the engine intake manifold. Then, the fuel quantity (Tp) to be injected is calculated based upon a detected engine rotating number (N) and the estimated air flow rate (Qc) at the engine cylinder port. However during the engine starting period, a learned estimated pressure in the engine intake manifold is used instead of the calculated estimate pressure (Pi) in the engine intake manifold to determined the retrieved estimated air flow rate (Qc). The learned estimated pressure in the engine intake manifold for the engine starting period is obtained by taking in a value of calculated estimated pressure (Pi) in the engine intake manifold immediately after the engine reaches a comp…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.