Automatic temperature and humidity regulation – Miscellaneous – Burner controls with automatic cutoff
Patent
1997-12-19
1999-07-06
Wayner, William
Automatic temperature and humidity regulation
Miscellaneous
Burner controls with automatic cutoff
236 15BD, 431 12, G05D 2300, F23D 512
Patent
active
059188030
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention pertains to the output control of a burner of a heater operated with excess air, especially of an air heater, especially for interior spaces or driver's cabs of motor vehicles, with a plurality of or many power stages, which differ both in terms of the fuel throughput and by the air throughput generated by a controllable blower.
BACKGROUND OF THE INVENTION
A plurality of adjacent power stages can be set in heaters currently used for interior spaces of vehicles, especially the driver's cabs of trucks. In general, a thermostatic monitoring of the room temperature as well as automatic regulation of the heat output are provided, and, depending on the variance of the room temperature, different power stages of the heater are switched on by an automatic unit, or the latter unit performs a changeover between the power stages in order to bring the room temperature to the set value or to maintain it at the set value. If the doors or windows of the vehicle space remain closed for a long time or remain open without change (and not excessively), a final stage, in which a high-low control takes place with more or less rapid change between adjacent power stages and the room temperature remains constant within relatively narrow limits, will become established after a starting phase of variable duration.
At all power stages, the air and fuel throughputs are essentially such that a relative optimum of consumption is obtained with respect to the fuel needed. Different power stages therefore differ regularly in terms of both the fuel throughput and the air throughput and consequently also in terms of the output of the burner blower, which is primarily responsible for the air throughput. For reasons of comfort, the air throughput and the fuel throughput are not changed, in general, abruptly at the time of a changeover between power stages, but a phase of transition of varying duration, during which the values of the air and fuel throughputs are adjusted to the standard values of the power stage currently being set more or less continuously and with a time delay of variable duration, is passed through after a changeover between the power stages. Concerning the output of the blower of the burner, which maintains the air throughput, this means that the blower output is raised or lowered "gradually" during the said phase of transition at the time of a changeover between heating output stages.
The noises of the blower may also be felt to be a nuisance, especially when the driver spends a rather long time in the parked vehicle with the engine not running during the nighttime hours or during prolonged breaks.
SUMMARY AND OBJECTS OF THE INVENTION
The object of the present invention is therefore to ensure a higher level of comfort for heaters of the above-described type.
This object is accomplished according to the present invention by a control or regulation of the fuel throughput being able to be switched on at approximately constant air throughput and/or constant blower output.
The present invention is based on the general idea of also making possible a primarily noise-optimized control or regulation, besides an essentially consumption-optimized control or regulation of the heater. While the values of the air and fuel throughputs in the mode of operation mentioned in the introduction are directed toward a maximum heat output compared with the amount of fuel needed, taking into account at the same time the requirement that exhaust gases with a low pollutant level shall be generated, a constant, usually relatively low blower output can be combined with variable burner throughput in the mode of operation additionally provided according to the present invention, in order to be able to guarantee a variable heat output at constant blower noise. Even though a certain increase in fuel consumption has to be accepted compared with the heat output in this mode of operation, which is designed for increasing comfort, this extra consumption remains rather small and is certainly justified by the
REFERENCES:
patent: 2527430 (1950-10-01), Kniveton
patent: 4585161 (1986-04-01), Kusama et al.
patent: 4613072 (1986-09-01), Kikuchi et al.
patent: 5630408 (1997-05-01), Versluis
WO84/02402 Jun. 1984 PCT, Broach et al.
Pfister Wolfgang
Reiser Peter
J. Eberspacher GmbH & Co.
Wayner William
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