Patent · US Expired

Method and apparatus for determining the injected fuel quantity in internal combustion engines

US4448067A · kind A · utility

2Cited by

3References

16Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Hans-Christian Engelbrecht · Stuttgart, DE
Helmut Kniss · Waiblingen, DE
Wolf Wessel · Oberriexingen, DE

Key dates

Filing date	Sep 22, 1982
Grant date	May 15, 1984
Priority date	—
Expiry date	Sep 22, 2002

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/12
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A method and apparatus for determining the injected fuel quantity in internal combustion engines having self-ignition are proposed. A performance graph is prepared which includes the injected fuel quantity per stroke in accordance with the injection duration, with the rpm as a parameter. In order to avoid a fictive 0 point, the injection duration is shortened by a predetermined period of time and multiplicatively linked with an rpm signal, while linear rpm correction curves having a dependency of the rpm voltage on the injection duration can be assumed. At the output of an integrator by means of a sample and hold circuit, an injection quantity signal is produced whenever the rpm signal (Un) is supplied to the integrator for the integration process and the duration of the integration is determined on the basis of the injection duration signal (SD).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.