Heating arrangement for electrically driven vehicles

US4532894A · kind A · utility

Assignee

• Daimler-Benz AG · DE

Inventors

• Helmut Wulf · Esslingen am Neckar, DE
• Friedrich Baehrle · Waiblingen, DE

Key dates

• Filing date: Mar 30, 1984
• Grant date: Aug 6, 1985
• Expiry date: Mar 30, 2004

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01P7/165
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

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.