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US 4,685,616 AGranted
Process and switching means for controlling heat performance in a heating device
AssigneeWebasto-Werk W. Baier GmbH & Co.
InventorFriedrich Stein
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AssigneeWebasto-Werk W. Baier GmbH & Co.
InventorFriedrich Stein
Estimating the term…
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.
Process for controlling heating output of a heating device, particularly for use in vehicles, operating with a heat exchange medium, in which the heat output is controlled in dependence upon a control temperature and predetemined temperature threshold values to produce at least full load high heat output, partial load low heat output and switched off operational states comprising the steps of determining a temperature gradient with respect to time during heating of the heat exchange medium between two of said temperature threshold values and, in dependence upon the slope of the temperature gradient, controlling the operational state of the heating device.
Switching device for controlling the output of a heating device, particularly for use in vehicles, comprising a heat output control means for placing the heating device in at least full load, partial load, and switched-off operational states in dependence upon a control temperature sensed by a temperature sensor in a heat exchange medium of the heating device and based on predetermined temperature threshold values, a sensing device for determining a temperature gradient with respect to time of the heat exchange medium during heating thereof between at least two of said temperature threshold values, a control unit which is connected with the sensing device and which is a means for activating the heat output control means dependent upon a slope of the temperature gradient.
Switching arrangement according to claim 18, further comprising comparator control means, outputs of which are connected with said control unit for comparing the first and second predetermined values with the time period measured by the timer means.
Dependencies are inferred from the claim text.