Heating apparatus for vehicle

Details Heating apparatus for vehicle Heating apparatus for vehicle

1997-09-24

1998-12-29

Solis, Erick R.

Internal-combustion engines

Engine speed regulator

Idle speed control

1231425R, F02D 4116

Patent

active

058529950

ABSTRACT:
A viscous heater for heating cooling water for cooling a water cooled engine is provided in a cooling water circuit between the engine and a front heater core. Even if a viscous switch is turned on by a viscous ECU to heat a passenger compartment using the viscous heater, a viscous clutch is not immediately turned on when the engine is idling. That is, after a delay control time elapses after increasing an idling rotational speed of the engine to a target rotational speed, the viscous heater is turned on. The target rotational speed which is higher than a normal idling rotational speed is set in such a manner that the higher the cooling water temperature is, the lower the target rotational speed becomes. Thus, even if a large load is applied to the engine by operating the viscous heater when the engine is idling, it can improve fuel economy and prevent an engine stall.

REFERENCES:
patent: 4836164 (1989-06-01), Morozumi et al.
patent: 4883034 (1989-11-01), Yashiki et al.
patent: 4993377 (1991-02-01), Itakura
patent: 5121725 (1992-06-01), Araki
patent: 5235947 (1993-08-01), Watanabe
patent: 5249559 (1993-10-01), Weber et al.
patent: 5265571 (1993-11-01), Sodeno
patent: 5666917 (1997-09-01), Fraser et al.
patent: 5711262 (1998-01-01), Ban et al.

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