Heater for motor vehicles which can be operated on several power settings

US4984736A · kind A · utility

Assignee

• J. Eberspacher · DE

Inventors

• Peter Reiser · Jeffery Road, DE
• Edwin Steiert · Wolfschlugen, DE
• Wolfgang Schaffert · Esslingen am Neckar, DE

Key dates

• Filing date: Jun 9, 1989
• Grant date: Jan 15, 1991
• Expiry date: Jun 9, 2009

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F23N2241/14
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

By temperature gradient detection it is determined for the liquid combustion chamber auxiliary heater for motor vehicles, whether e.g. a flame blow-off has taken place, which has to be interpreted as a malfunction and hwich necessitates the discontinuation of fuel supply. Alternatively, it might merely show the switching from a high setting to a low setting. In the latter case a temperature drop to a lower operation temperature occurs also. However, the temperature drop is not as steep as in the case of a flame blow-off. At certain points in time t.sub.1 the target temperature for a point in time t.sub.2 is calculated by the detected temperature according to a certain algorithm having specific device properties as parameters. At this point in time the calculated target temperature is checked for errors.