Vehicular air-conditioning apparatus

• US 20060102335A1
• Filed: 10/26/2005
• Published: 05/18/2006
• Est. Priority Date: 10/28/2004
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Fujiki, Tsutomu, Hakamada, Hitoshi
• Granted Patent: US 7,222,667 B2
• Time in Patent Office: Days
• US Class Current: 165/297
• CPC Class Codes: B60H 1/0005 the air being firstly cooled and subsequently heated or vice versa
• CPC Class Codes: B60H 1/034 from the cooling liquid of the propulsion plant and from an electric heating device
• CPC Class Codes: B60H 2001/00128 Electric heaters
• CPC Class Codes: B60H 2001/00164 with more than one by-pass
• CPC Class Codes: G05D 23/1932 to control the temperature of a plurality of spaces

Abstract

A vehicular air-conditioning apparatus includes a hot-water heater and an electric heater provided downstream of the hot-water heater. The apparatus also includes a bypass passage for allowing air-conditioning air flowing past the hot-water heater to bypass the electric heater and a bypass door provided in the bypass passage for opening and closing bypass passage.

Claims

1. A vehicular air-conditioning apparatus comprising:

an air-conditioning duct for allowing passage of air-conditioning air therethrough;

a hot-water heater, disposed within the air-conditioning duct, for heating the air-conditioning air by using engine-cooling water;

an electric heater, disposed downstream of the hot-water heater, for electrically heating the air-conditioning air;

a bypass passage for allowing the air-conditioning air flowing past the hot-water heater to bypass the electric heater; and

a bypass door for selectively opening and closing the bypass passage.

2. The vehicular air-conditioning apparatus according to claim 1, further comprising a controller for controlling the bypass door such that the bypass door is closed only when a mode of discharge of the air-conditioning air from the air-conditioning duct is one of a heater mode and a heater-defroster mode while a target temperature of the air-conditioning air discharged from the air-conditioning duct is equal to or higher than a predetermined temperature or a temperature of the engine-cooling water is equal to or lower than a predetermined temperature.