Patent · US Expired

Method for monitoring a coolant circuit of an internal combustion engine

US6862518B2 · kind B2 · utility

0Cited by

3References

2Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Juergen Schwabe · Echterdingen, DE
Peter Wiltsch · Riedlingen, DE

Key dates

Filing date	Apr 17, 2002
Grant date	Mar 1, 2005
Priority date	—
Expiry date	Apr 17, 2022

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF01P2031/20
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

In the method of monitoring a cooling fluid circuit of an internal combustion engine with setting a first error signal if a deviation of an actual value of a temperature from a desired value of the temperature exceeds a predetermined amount, a second error signal is set, which indicates a possible lack of antifreeze if a starting temperature is below the freezing point of water, a first error signal was present, the first error signal is no longer present after a predetermined time which is a function of the engine starting temperature and a build-in energy balance exceeds a threshold which is a function of the engine starting temperature.

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