DE2850730C2 - Control unit for heating and air conditioning systems in motor vehicles - Google Patents

Description

f 'Air conditioning is due to the admitted delivery power of the fan of over 80% in addition to the <J switches 10, 11 and 12 of the switch 10' closed. The y excitation coil 6 'picks up and brings the switching contacts 4 If and 5 into their working position. Thus, the heating will be t \ fields 1 and 2 in parallel via the switching contact 5 with; "Electrified The in this parallel circuit gegcn- {■ across the series circuit four times larger POWERFUL * Reception of heating panels 1 and 2 enough that with | large) probability at these extreme weather \ {approximately ratios to a strong inclination fogging \. to keep constricting rear window free. ti lasts the great power of the heating and Klimaanla-% ge, so 8 interrupts the bimetal switch the line I T. the excitation coil 6 'drops out and switches the heating fields 1 and 2 back into the I series with the I switching contacts 4 and 5. If the heating and air conditioning system continues to operate at high output, the bimetal switch 8 I closes the line T again after a certain cooling time. I the, whereby the heating fields 1 and 2 are switched back in parallel for a certain time.

1 sheet of drawings

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Claims (4)

1 2 Switchover to low power, a new patent claim: the heating fields are switched to high power. A particularly simple and reliable switch 1. Control unit for heating and air conditioning systems in ter for this switchover to low and again to motor vehicles, according to patent 26 54 357, thereby 5 high power is a bimetal switch.
characterized that in one of several An embodiment of the invention is explained in more detail with reference to the heating fields (1 and 2) existing rear window drawing, in which a control unit for heating the heating fields (1 and 2) from a certain heating and air conditioning in The setting of the heating or air conditioning systems shown in motor vehicles is high, which also switches a rear window heater from power and under this setting with low ger power can be supplied. An electric heater for a not shown 2. Control device according to claim 1, characterized in the rear window of a motor vehicle contains two heating panels, that the heating fields (1 and 2) with set 1 and 2 each have the same number of filaments 1 ' ter high power after a predetermined time on and 2 ', of which the first heating field 1 on the one hand constantly low power can be switched. 15 with ground and on the other hand via a line 3 with the 3. Control device according to claim 2, characterized in that the second heating field 2 is connected draws that the heating fields (1 and 2) is some time at both ends with switching contacts 4 and 5 one after switching to low power, reconnected to switchover relay 6. The switching contacts 4 and 5 high power can be switched. are connected to a line 7 in the rest position, 4. Control device according to claim 2 and 3, marked 20 or not assigned potential and in the working position marked by a bimetallic switch (8) connected to ground or the line 7 for the circulation,
switching of the heating fields (1 and 2) from high to the excitation coil 6 'of the switching relay 6 is together low power and vice versa men with a bimetal switch 8 in a line T parallel to line 7. Lines 7 and T are with 25 of a line 9 connected to a not shown Ignition switch (15) and thus with the ignition switch closed to the positive pole (+) of the vehicle electrical system leads to The invention relates to an operating device for the lines 7 and T are two switches 10 and 10 ' Heating and air conditioning systems in motor vehicles, arranged according to Pa, the z. B. through a link guide tent 26 54 357. 30 an air volume adjuster to control air ducts The main patent solves the problem of having a general and a fan motor in one heating and cooling unit manual actuation of the rear window home system - not shown - are controlled. the and the rear window auto- switches 10 and 10 'are closed when the fan is switched off to keep fogging-free as possible. A medium or high power consumption in the advanced training engine To this end, there is the object of the present invention and the fan has a medium or large conveying loop therein, a fogging of the rear window even with stung of z. B. 20 or 80% of the maximum delivery extremes To avoid weather conditions. have performance. The invention solves this problem by the characteristic The line 9 contains a switch 11 which, for. B. drawing part of claim 1 contained if a link guide by an air distribution features. 40 lungseinstellgiied to control various air outlets The invention provides an additional connection between - not shown - controlled and closed see the performance of the heating and air conditioning system and that is when the windshield is exposed to air, Rear window heater output. Since with the extreme and one switch 12, which starts from a central setting the heating and air conditioning system of a temperature selector - not shown - ge works with high power and at the same time the 45 is closed Probability of heavy fogging, as a rule, if the blower output is below that for the rear window is particularly high, the closing of the switch 10 means that the automatic activation of the two heating fields is assumed to be 20%, the line 7 is open The heater output in this case too, the rear window fields 1 and 2 are switched off,
kept impact-free. Below the setting for this switch-on 50 If the flow rate of the blower lies between the setting of the heating and air conditioning that is decisive for closing the switches 10 and 10 ', the switching of the heating fields with lower values of 20 and 80% is sufficient the switch 10 closed power usually off to avoid fogging of the hedge, while the switch 10 'is still open. The road safety is so- If the windshield is exposed to air, ie with the 55, the switch 11 is closed by the safe avoidance of fogging, and the temperature rear window increased selector between the central and maximum position in all climatic conditions. stands, ie the switch 12 is closed, the To the load on the electrical system by the rear heating panels 1 and 2 via the line 7 and the switch disk heater To keep it low, a contact 4 can be supplied with power in series In an advantageous further development of the invention, the heating element 60 adjusts the air volume adjuster, the air compressor when switching on with high power according to an advance setting element and the temperature selector given The middle setting of the heating and air conditioning system is switched to low power the. In this case, in the event of a prolonged period, there is a likelihood of fogging Air conditioning operation with high power due to rear window large. The relatively low heating output In this case, however, the unchanged high probability of a star is usually sufficient, the Heckkes If the rear window is misted, a new single pane can be kept mist-free. to guarantee the heating fields with high output. sten, can in an advantageous manner some time after the nissen required high performance of the heating and