Patent · US Expired

Device for recirculating exhaust gas in an internal combustion engine

US4594993A · kind A · utility

11Cited by

9References

12Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Gerhard Engel · Stuttgart, DE
Hans-Christian Engelbrecht · Stuttgart, DE
Wolf Wessel · Oberriexingen, DE

Key dates

Filing date	Sep 6, 1983
Grant date	Jun 17, 1986
Priority date	—
Expiry date	Sep 6, 2003

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/40
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

Disclosed is a system for recirculating exhaust gas in an internal combustion engine having an exhaust gas recirculating conduit which is provided with a valve controlled by two solenoid windings. The system includes a control device including a PID regulator having limitations and cooperating with a three-point switching circuit which exhibits a hysteresis and includes a feedback. The energizing signals for the two solenoid windings are limited between a minimum and a maximum value, whereby the minimum value is defined by the operational sensitivity of the exhaust gas recirculating valve.

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