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:
Aug. 06, 1985
Filed:
Mar. 30, 1984
Helmut Wulf, Ostfildern, DE;
Friedrich Baehrle, Kernen-Rommelshausen, DE;
Daimler-Benz Aktiengesellschaft, Stuttgart, DE;
Abstract
A heating system for a dual-mode vehicle, such as a bus equipped with both electrical and internal combustion engine drive systems, is provided with an electrically powered heat exchanger and an auxiliary fuel heater serially connected in the engine cooling water flow line. The electric heat exchanger provides a non-polluting source of heat for the vehicle's interior within electrified portions of the drive route. The auxiliary heater supplies heat when the vehicle is standing (i.e., parked) with the engine shut off in non-electrified portions of the route. An electric water pump is also connected in series with the electric and fuel heaters. During periods of electric drive operation, the electric heater is activated when the engine cooling water temperature falls below a predetermined level even if no heat is required for the vehicle interior. The electric heater prevents the engine from cooling off and, thus, improves exhaust gas characteristics, from an environmental viewpoint, when the engine is re-started.