Patent · US Expired

Safety system for internal combustion engines

US4905645A · kind A · utility

6Cited by

4References

4Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Bernhard Bonse · Stuttgart, DE
Werner Fischer · Heimsheim, DE
Gerhard Stumpp · Stuttgart, DE

Key dates

Filing date	Jan 23, 1989
Grant date	Mar 6, 1990
Priority date	—
Expiry date	Jan 23, 2009

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02B3/06
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

To monitor the functioning of a redundant safety fuel shut off valve in a diesel engine, the electric power supply for a controlling device for the fuel quantity adjustor of a fuel injection pipe is decoupled from the power supply for the control of the electromagnetic fuel shut off valve. A relay controlled by a driving switch of the engine has a contact whose opening is time delayed relative to the opening of the driving switch. The relay contact is connected for energizing the controlling device for the fuel quantity adjustor whereas the energization and deenergization of the fuel shut off valve is effected immediately via a decoupling member. When the driving switch is opened and the engine is running during the given time delay interval, an error signal is generated indicating a malfunction of the fuel shut off valve.

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