Process for operating a motor vehicle heating system and motor vehicle heating system

US5014910A · kind A · utility

Assignee

• Webasto AG Fahrzeugtechnik · DE

Inventors

• Peter Koch · Wulfen, DE
• Peter Waas · Munich, DE
• Franz Neumeyer · Ascholding, DE
• Georg Baechle · Germering, DE

Key dates

• Filing date: Dec 11, 1989
• Grant date: May 14, 1991
• Expiry date: Dec 11, 2009

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60H1/032
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A motor vehicle heating system which is provided in a motor vehicle coolant circuit containing a motor vehicle engine, a motor vehicle heater with a heat exchanger and an associated blower, and a fuel operated heating device that is independent of the motor vehicle engine and is connected upstream from the motor vehicle heater, and a process for operating such a motor vehicle heating system, by which the motor vehicle engine in the motor vehicle coolant circuit is heated first to a temperature which is low yet facilitates its starting, and then the coolant is heated so that the motor vehicle heater can provide heat quickly. Until a first predetermined temperature of the coolant is reached, the coolant, is circulated in the complete motor vehicle coolant circuit. Then, the coolant, while bypassing the motor vehicle engine and the motor vehicle heater, is circulated between the intake and the outlet of the fuel operated heating device, until a second predetermined temperature is reached, at which point, the bypass connecting the intake and outlet of the heating device is opened. After reaching and exceeding the second predetermined temperature, the coolant is the, again, gradually ci…