Process for operating a motor vehicle heating system and motor v

Details Process for operating a motor vehicle heating system and motor v Process for operating a motor vehicle heating system and motor v

1989-12-11

1991-05-14

Bennett, Henry A.

Heating systems

Automatic control

Heat source is a reverse cycle refrigerating system or heat...

237 123B, 237 123C, B60H 102

Patent

active

050149105

ABSTRACT:
A motor vehicle heating system which is provided in a motor vehicle coolant circuit containing a motor vehicle engine, a motor vehicle heater with a heat exchanger and an associated blower, and a fuel operated heating device that is independent of the motor vehicle engine and is connected upstream from the motor vehicle heater, and a process for operating such a motor vehicle heating system, by which the motor vehicle engine in the motor vehicle coolant circuit is heated first to a temperature which is low yet facilitates its starting, and then the coolant is heated so that the motor vehicle heater can provide heat quickly. Until a first predetermined temperature of the coolant is reached, the coolant, is circulated in the complete motor vehicle coolant circuit. Then, the coolant, while bypassing the motor vehicle engine and the motor vehicle heater, is circulated between the intake and the outlet of the fuel operated heating device, until a second predetermined temperature is reached, at which point, the bypass connecting the intake and outlet of the heating device is opened. After reaching and exceeding the second predetermined temperature, the coolant is the, again, gradually circulated in a controlled manner in the complete motor vehicle coolant circuit as the bypass is gradually closed until its final closed position.

REFERENCES:
patent: 4892248 (1990-01-01), Robin et al.

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