Patent · US Expired

Method and apparatus for controlling the operation of an internal combustion engine

US4044236A · kind A · utility

16Cited by

5References

12Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Valerio Bianchi · Biberach an der Riß, DE
Peter Schmidt · Schwieberdingen, DE
Reinhard Latsch · Leinfelden, DE

Key dates

Filing date	Feb 19, 1976
Grant date	Aug 23, 1977
Priority date	—
Expiry date	Feb 19, 1996

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02D2200/1015
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

The operation of an internal combustion engine in the region of its lean-running limit is controlled on the basis of engine roughness as measured by an inductive crankshaft transducer. Its periodic signal gates the counting in a digital down-counter, from a pre-set number, at a frequency proportional to r.p.m. The content of the down counter is counted up or down in a subsequent up-down counter depending on the value of its own most significant bit which indicates the algebraic sign of the phase comparison between the transducer frequency and the r.p.m.-proportional frequency. Two digital integrating stages eliminate effects due to constant engine acceleration. A decoder supplies a control signal to a final control element for fuel, air or exhaust control.

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