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:
Jul. 29, 2003
Filed:
Mar. 24, 2000
Xin Zeng, Auburn Hills, MI (US);
Gregory Alan Major, Beverly Hills, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
An apparatus for heating the interior compartment of a vehicle, the apparatus has a primary heating system, a secondary heating system and an operating system. The primary heating system receives and circulates an engine coolant through a heater core. The secondary heating system receives and circulates a gas, the secondary heating system heats the gas and circulates the heated gas through a heat exchanger. The operating system for operating the heating systems, the operating system receives a plurality of inputs and in response to the inputs the operating system determines which of the heating systems is to be activated in response to a heating request. The operating system also determines whether or not to deactivate one or both of the heating systems.