Heating systems – Automatic control – Processes
Patent
1986-05-15
1987-08-11
Bennet, Henry A.
Heating systems
Automatic control
Processes
237 2A, 236 91F, 236 46F, B60H 100
Patent
active
046856161
ABSTRACT:
A process for controlling heat output of a heating device, such as an auxiliary heating device for a vehicle, and a switching arrangement for performing such process. The governing value in controlling the heat output is the temperature gradient with respect to time during heating of a heat exchange medium between two temperature threshold values. The threshold values are empirically determined and prespecified. The operating condition of the heating device is regulated in dependence upon the slope of the temperature gradient which is determined, preferably, based upon the time for heat-up of the heat exchange medium. The heat-up time is measured with the aid of a timer, and the heating time thus measured is compared with predetermined, prespecified values therefor. The temperature gradient of the heat exchange medium is determined by way of a sensing device in the switching arrangement, which is connected with a control unit, and which correspondingly activates the heat output control means of the heating device. The control unit effects control of the heating device units, dependent upon comparative results, which are based on prespecified values for the heating period.
REFERENCES:
patent: 4373662 (1983-02-01), Bassett et al.
patent: 4411385 (1983-10-01), Lamkewitz
patent: 4436064 (1984-03-01), Lamkewitz et al.
Bennet Henry A.
Webasto-Werk W. Baier & Co.
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