Coolant temperature control system for an internal-combustion engine

US5692460A · kind A · utility

Assignee

• Bayerische Motoren Werke Aktiengesellschaft · DE

Inventors

• Joachim Froeschl · Herrsching am Ammersee, DE
• Gerhart Huemer · Neukeferloh, DE
• Dieter Wittelsberger · Munich, DE
• Wolfgang Schmidt
• Heinz Lemberger · Seßlach, DE
• Guenter Ranzinger · Garching bei München, DE
• Dietmar Franz
• Ralf Weiss · Banteln, DE

Key dates

• Filing date: Jun 7, 1996
• Grant date: Dec 2, 1997
• Expiry date: Jun 7, 2016

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01P2070/04
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A coolant temperature control system for an internal-combustion engine in a motor vehicle having an electrically heatable thermostatic valve whose method of operation can be shifted by electrical heating in the radiator operation direction. Control devices are provided for recognizing a defect of another system in the motor vehicle which controls the coolant flow. When a defect of this other system is recognized, the thermostatic valve is heated. Particularly when a defect is recognized, the heating of the thermostatic valve is controlled such that the coolant temperature is maintained below a preset coolant temperature threshold. Preferably, the recognition of a defect is carried out by means logically monitoring output signals of the other system.