Patent · US Expired

Safety device for a microcomputer controlled internal combustion

US4587939A · kind A · utility

9Cited by

3References

6Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Herman Hemminger · Asperg, DE
Werner Jundt · Ludwigsburg, DE
Sybille Weller · Oberriexingen, DE
Peter Werner · Wiernsheim, DE

Key dates

Filing date	Oct 25, 1984
Grant date	May 13, 1986
Priority date	—
Expiry date	Oct 25, 2004

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02D2250/12
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A safety device for a controlling unit of an internal combustion engine controlled by a microcomputer includes the following circuits: (a) a source of stabilized voltage which may be subject to fluctuations; (b) a first monitoring circuit responsive to voltage breaks in the voltage source to block the controlling unit for the duration of respective voltage breaks; (c) a second monitoring circuit responsive to the operability of the microcomputer to block the controlling unit for the duration of the resetting time of the microcomputer when a non-operative condition of the microcomputer is detected.

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