Heating systems – Automatic control – Heat source is a reverse cycle refrigerating system or heat...
Patent
1986-05-15
1988-02-23
Bennet, Henry A.
Heating systems
Automatic control
Heat source is a reverse cycle refrigerating system or heat...
236 21R, G05D 2300
Patent
active
047265140
ABSTRACT:
A heating device, particularly an auxiliary vehicle heating device, in which there are disposed, a first temperature sensor at the inlet, and a second temperature sensor at the outlet of the heating device. The outputs of the two temperature sensors are connected with a circuit, so that the operating condition of the heat exchanger of the heating device can be constantly monitored. For the purpose of early detection of a tendency towards overheating of the heating device, appropriately, the temperature differential between the two temperature sensors is determined, and, based upon a predetermined threshold value, the heating device is turned off, if necessary, in order to prevent resultant damage. The outputs of the temperature sensors can also be integrated with a control unit for the performance of control functions and, based upon different switch points, control operation of the vehicle blower, the heating output, and/or the heat exchanger temperature.
REFERENCES:
patent: 2602591 (1952-07-01), Wilson et al.
patent: 2689932 (1954-09-01), Hornfeck
patent: 3847350 (1974-11-01), Thompson
patent: 4497438 (1985-02-01), Bonne
Bennet Henry A.
Webasto-Werk W. Baier GmbH & Co.
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