Method and arrangement for a delayed shutoff of control apparatus of an internal combustion engine

US5255642A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Jurgen Pischke · Rutesheim, DE
• Herbert Arnold · Eberdingen, DE

Key dates

• Filing date: Dec 12, 1991
• Grant date: Oct 26, 1993
• Expiry date: Dec 12, 2011

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2200/503
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention is directed to a method for operating control apparatus during delayed shutoff after switching off the ignition of an internal combustion engine. This method protects the battery as far as possible and for this method, three principles are applied individually or in any desired combination but preferably all together. The first principle provides that the delayed-shutoff functions are no longer carried out, as has been conventional, until a fixed pregiven time duration is reached; instead, the functions are either interrupted when values of special variables reach a fixed pregiven threshold or a threshold fixed in dependence upon operating variables in advance of switch-off of the engine is reached. The particular monitored physical variable and the threshold value corresponding thereto are each so selected that, when the actual value reaches the threshold value and accordingly, the delayed-shutoff function is interrupted or not even started, this occurs without essentially influencing the new start capacity of the engine. The second principle provides that delayed-shutoff functions, and especially those which require a high current flow, are not carried out simultane…