The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 14, 1991
Filed:
Dec. 11, 1989
Peter Koch, Munich, DE;
Peter Waas, Munich, DE;
Franz Neumeyer, Ascholding, DE;
Georg Baechle, Germering, DE;
Webasto AG Fahrzeugtechnik, , DE;
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 circulated in a controlled manner in the complete motor vehicle coolant circuit as the bypass is gradually closed until its final closed position.