DE3519466A1 - DEVICE FOR AUTOMATICALLY CONTROLLING THE TEMPERATURE OF AIR, WHICH IS DELIVERED TO THE VEHICLE'S ROOM - Google Patents

Description

DR.-ING. DIPL-PHYS. H. STURIES
PATENT LAWYERS

DIPL-ING. P. EICHLER ο r 1 η / r,>

351946b

BRAHMSSTRASSE 29, 5600 WUPPERTAL 2

Guardini S.p.A., Corso Galileo Ferraris, 24 / A, 10121 Torino (Italy)

Device for automatic temperature control

of air that is supplied to the passenger compartment of a vehicle.

The invention relates to a device for automatically controlling the temperature of air, the passenger compartment of one with a heat engine provided vehicle is supplied, with a hydraulic to a cooling water circuit of the machine connected heat exchanger, and with one the air supplied to the passenger compartment through the heat exchanger pressing conveyor.

Such vehicles are for example with a
Motor vehicles equipped with internal combustion engines. These

have a fan as the air delivery device, with which the air across the heat exchanger and through suitable air nozzles into the interior of the passenger compartment is printed.

The flow rate of the heat exchanger or the Auxiliary cooler can be regulated with a valve, as can the air supplied to the passenger compartment the regulation of the fan and / or can be regulated by regulating the cross section of the air nozzles. However, since the outside temperature and the vehicle speed are variable, temperature fluctuations can occur in the vehicle compartment occur that require constant manual readjustment for temperature control in the passenger compartment make necessary.

The invention is based on the object of the device to improve the type mentioned so that the temperature of the air supplied to the passenger compartment. is automatically controlled to achieve a substantially constant temperature in the passenger compartment, the corresponds to a setpoint and is independent of the working speed the heat engine, the vehicle speed and the outside temperature.

This object is achieved in that there is a valve which is used to regulate the flow rate of the water flowing through the heat exchanger can be controlled by an electric motor and that for measuring the Air temperature in the passenger compartment in relation to a desired setpoint and to accordingly control the Electric motor has an electronic monitoring circuit.

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Refinements and developments of the invention are described in the subclaims.

The invention is illustrated by means of one in the drawing Embodiment explained in more detail. It shows:

Fig. 1 is a schematic representation of the main Elements of the device,

Fig. 2 shows an electrical circuit of an electromotive driven valve of the device,

Figv 3 is a vertical step in the device valve used according to Fig. 1,

Fig. 4 is a plan view of a printed circuit board a shell of FIGS. 2 and

Fig. 5 is an illustration of signals at a specific point in the electrical circuit of Fig. 2 as a function of time.

Fig. 1 shows a known type of heat exchanger 1 which is connected to inlet lines 2 and outlet lines 3 in such a way that the water of the cooling circuit of a heat engine flows through it. Transversely to the heat exchanger is arranged a blower 4 is also of a known type having differently adjustable ■ rotation speed. · On the blower 4 opposite side of the heat exchanger 1 is a heated air-collecting end housing 5 is provided, the channels 6 _r 7 'for forwarding the air having in different areas of the passenger compartment 8 of a motor vehicle.

In the inlet line 2 is to regulate the water flow a unit 10 installed in series, which has a flow-regulating valve 11 and an electric

has niche monitoring and control circuit 12, to which the following is connected:

a first temperature sensor 13 which is arranged in the channel 6 in terms of flow in front of a nozzle 14 which is encompassed by a second channel 15 which leads into the passenger compartment 8,

a second temperature sensor 16, which is in one on one Dashboard 17 arranged hollow body IS attached is, the one provided with holes for air inlet Front cover 19 and a laterally arranged outlet pipe 20, to which a line 21 is connected, which in a starting area 22 of the Channel 15 flows in front of nozzle 14,

and a potentiometer 24 which has an adjuster 25 for setting the desired temperature of the passenger compartment 8 has.

The electronic monitoring circuit shown in FIG 12 has a first differential amplifier 27, which has a first input 28 to which a terminal of the potentiometer 24 is connected while the other terminal is grounded. The differential amplifier 27 has a second input 29, to which a terminal of the sensor 13 is connected whose other terminal is grounded. There is a series between a positive voltage terminal and earth switched by three resistors 31, 32, 33 and the connection between the resistors 31, 32 is also with connected to input 29 of differential amplifier 27, while the connection between the resistors 32, 33 is connected to a first terminal of the sensor 16, whose other terminal is grounded.

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The output of the differential amplifier 27 is on an input 34 of a differential amplifier 35 is connected, which is a frequency-modulated oscillator and has a further input 36, which has a Capacitor 37 is grounded. Between the first entrance and the output of differential amplifier 35 is a Resistor 38 switched while the output of the amplifier 35 with an input 39 of a differential amplifier 4Ö is connected to a decoupling circuit forms and has a further grounded input 4i. Between the first input and the output of the differential amplifier 4Ö a resistor 42 is connected.

The non-grounded terminals of the sensors 13, 16 are each connected to a first terminal via resistors 43, 44 of a capacitor 45, the other terminal of which grounded through a resistor 46 and connected to an input

47 of a differential amplifier 48 is connected.

The ungrounded one. Terminal of the sensor 13 is also connected to a resistor 50, the other end of which to another input 51 of the differential amplifier

48 connected and grounded through a capacitor 52 is. The non-earthed terminal of the sensor 16 is also connected to the input 51 of the differential amplifier via a resistor 53 48 connected and grounded through the capacitor 52. The output of the differential amplifier. 48 is connected to the input 34 of the differential amplifier 35 via a resistor 54.

The output of the differential amplifier 40 is with connected to the base of an NPN transistor 55, whose The emitter is grounded and its collector is connected to the cathodes of two diodes 57, 58. The anode of the

Diode 57 is electrical with two diametrically opposed to each other opposite and relatively short sectors 60, 61 connected to a first circular path 62. The anode of the diode 58 is connected to a voltage source via a resistor 63 connected for positive voltage, as well as to the base of an NPN transistor.s 64, whose collector is connected to two more diametrically opposite, relatively short sectors 65, - 66 are connected with the same distance between the sectors 60, 61 on the Circular path 62 are arranged. The emitter of transistor 64 is grounded and also to four relatively long sectors 67 connected, which are electrically connected together and arranged on the circular path 62 between the short sectors 60, 61, 65 and 66 isolated from the latter are. Coaxially with the circular path 62 is a second continuous circular path 68 with a smaller radius, which is connected to a first terminal of an electric motor 70 which controls the actuation of the valve 11 in the manner described below, and its other terminal with a voltage source for positive voltage is connected. A brush 71, shown in dashed lines, is on the circular paths 62, 68 hoaxially rotatable, the two scanning arms 72, 73 of different lengths, the first on the circular path 68 grinds, while the second grinds on the circular path 62.

The unit 10 shown in detail in Fig. 3 has two expediently made of plastic Valve housing halves 75, 76 which have a hermetic edge connection 77 produced, for example, by welding own and enclose the valve 11 with its various components still to be described. With the lower Housing half 76 is described in detail below in

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In addition, one containing the monitoring circuit 12 Container 78 connected. This container 78 has areas different depths and an upper rectangular opening which is closed by a cover 79 which is fastened, for example, with screws, not shown is and has integral upper supports 80 on which a holding tab 81 is supported in each case. The retaining tabs 81 are integral with the lower housing half 76 and fastened to the supports 80 with screws 82.

The internal components of the container 78 are with a suitably designed intermediate floor

83 positioned, which in turn is positioning walls

84 and narrow feet 85, which in corresponding Recesses -86 of the housing 78 engage. Between the intermediate floor 83 and the floor of the housing 78 the electric motor 70 supported by projections 87 is arranged, that of a suitable rubber cover 68 is encased and has an output shaft 89 on which sits a gear 90 that - with another gear 91 meshes, which is coaxially and non-rotatably attached to a gear. The gears 91, 92 are between the Intermediate base 83 and the cover 89 are arranged. The gear 92 meshes with a gear 93 which is fixed to a Hub 94 is connected, which is mounted in the intermediate wall 83 and the cover 79 and in its interior a there attached spindle 95 carries over the cover 79 protrudes and protrudes through valve 11: to control this in the manner described below. At the lower end of the spindle 95 is the brush 71 attached, which the circular paths 62 ,. 68 scans which designed as printed circuits of a plate '96: are that of the container 78 with .stützen 97 in place and Position '.halteri, which have upper pins 98, which engage in corresponding holes 99 of the plate 96, as can best be seen from FIG. The plate

is further supported by projections 100 of housing 78 and between plate 96 and the bulkhead 83 are provided with elastic supporting cylinders 101 coaxial with the upper pins 98.

The other circuit elements of that shown in FIG Monitoring circuitry 12 are also housed in this container 78.

The lower housing half 76 has an upper chamber, in which an expediently made of ceramic material disc 102 is arranged, which prevents rotation with the housing half 76 by engagement of a Radial projection in a corresponding recess is connected, and an outer peripheral sealing ring 103 has. The disc 102 has two diametrically opposed to each other opposite through bores 105 which are in communication with an annular chamber 106, which in the lower area of the housing half 76 is present and communicates with the outside via a radial pipe 107 connected to the inlet conduit 2 of Fig. 1 is connected. A further disk 108 is supported on disk 102, which is expediently consists of a similar material and is acted upon by a spring 109, which is with its other End at an inner collar 110 of the upper half of the housing 75 supports .. The disc 108 has a pair of through holes 111, the shape of which can be seen in FIG and the top with a semi-annular chamber 112 communicate, which are in communication with the outside via a radial pipe 113 connected to the inlet duct 1 is connected to receive the inflowing water. The one passing through the housing halves 75, 76 Spindle 95 passes through an axial circular bore 115 of the

Disc 102 and above it has a section 117 of larger cross-section and non-circular profile, that in a corresponding opening 116 is non-circular Profile of the disc 108 is arranged so that both parts 117, 108 are non-rotatably joined together. the Spindle 95, which is provided with a slot at the top, penetrates the inner annular collar 110 from its section 117 and a sealing unit protrudes through the upper housing half 75 119, which is known per se and covered from above by a cap 120, which by not shown screws on an outer upper flange 21 of the upper housing half 75 is arranged. One hydraulic sealing unit 122, - which is similar to the Unit 119 surrounds the spindle 95 in the lower area of the lower half of the housing .76 and is covered from below by a cap 124 with Screws 125 is attached to the bottom of the lower housing half 76.

Fig. 4 shows the plate 96 in an enlarged view with printed circuits. The inner circular path 68 has an inwardly pointing radial projection 126 with connections 127 in order to be able to connect the terminals of the electric motor 70 in accordance with the circuit of FIG. 2. .The 'sectors 60, 61, 65, 66 have corresponding terminals 60 ¹ ', 61 'for connecting the anode of the diode 57 and 65', 66 'for connecting the collector of the transistor 64. The four interposed interconnectors 67 of the circular path 62 are provided with a ground terminal 67 ', which' .also for connecting the emitter of the transistor. 64 ^: dierit. From the representation of the disks 102, 108 in dashed lines in FIG. 4, it can be seen that the openings 105 of the fixed disk 102 correspond in terms of angle to the sectors 60, 61 of the first circular path 62

INSPECTED

are arranged, while the through holes 111 of the rotatable disk 108 is obviously a variable one Angular position with regard to these openings can assume, with them in Fig. 4 accordingly the sectors 65, 66 are arranged so that the valve 11 is closed.

The above-described inventive device operates as follows: The according to FIG 1 in the passenger compartment 8 to be conveyed air is guided to the fan 4 via the heat exchanger 1, and then printed through the channels 6, 1.. The sensor 13 arranged in the duct 6 consequently supplies an electrical signal which depends more or less on the temperature of the heated air flowing into the passenger compartment 8. The sensor in the dashboard 17 supplies an electrical signal which is proportional to the temperature of the air in the passenger compartment 8. The line 21 and its outlet located in front of the nozzle 14 ensure that air is circulated from the passenger compartment 8 through the housing 18 containing the air-circulated sensor 16, the outlet pipe 20 and the line 21 into the channel 15 leading back into the passenger compartment 8, so that the sensor 16 reacts to an equalized value of the air in the passenger compartment 8. The two electrical signals of the sensors 13, 16 are compared in the monitoring circuit 12 with the signal of the reference temperature, which was preselected by a user with the actuator 25 of the potentiometer 24, so that depending on the deviations from the setpoint of the temperature, a corresponding regulation of the Water flow rate through the valve 11 is achieved and therefore a proportional control of the amount of heat supplied to the heat exchanger 1, which this in turn of

air trapped in the housing 5 passes, which then is promoted in the passenger compartment 8.

The electrical signals supplied by the sensors 13, 16 according to FIG. 2 are proportioned in relation to one another by the resistors 31, 32, 33 as a function of the parameters of the various components from which the device is constructed and as a function of the vehicle, in which it is used. These electrical signals are passed on to the input 29 of the differential amplifier 27 and compared with the signal which is present at the input 28 and is generated by the potentiometer 24. The output signal of the differential amplifier 27 depends on the difference 'between the temperature of the passenger compartment 8 and the desired temperature and is fed to the differential amplifier 3 5, which operates as a frequency-modulated oscillator with a variable duty cycle and at its output provides a signal as shown in FIG. 5a, in which the duration of the positive square wave varies within constant time segments of about 5 seconds, delimited by vertical lines. The output of the differential amplifier 35 supplies, via the decoupling circuit containing the differential amplifier 40, a control signal for the transistor 55 shown in FIG the sectors -60, '61 of the outer circular path 6 2 positive voltage at a higher level, while the sectors 65, ¹ '66 are grounded. As a result, the electric motor 70 is supplied with current when the brush 71 - which in the rest position always corresponds to one of the two pairs of sectors 60, 61 or 65, 66 - is arranged

is - is arranged according to the sectors 65, 66, so that the valve 11 is closed according to FIG. For this purpose, the electric motor 70 rotates the spindle 95, the brush 71 and the movable one fixedly connected to it Disc 108 with the gears 90, 91, 92, 93 (Fig. 3), the power supply of the electric motor 70 for that angular range stops in which the arm 73 slides on a sector 67 of the circular path 62. if this arm 73 reaches the sector 60 or 61, the electric motor 70 a, since the sectors 60, 61 with positive voltage are applied. As a result, the conditions for opening the valve 11 are created with the bores 111 above the bores 105 of the fixed disc 102 are arranged. These conditions for opening the valve 111 remain for the entire time from t to t. (Fig. 5a) exist, during which the polarities described of sectors 60, 61 and 65, 66 remain. On the other hand, if the brush 71 is already in one of the Sectors 60, 61 would be in the corresponding position, in which the valve 11 would be open, this open position would remain in place without moving the electric motor 70.

At time t, at which the signal in FIG. 5a becomes positive, the transistor 55 becomes conductive while the transistor 64 is switched off, so that the sectors 60, 61 are now grounded, while the sectors 65, 66 are connected to a positive voltage will. As a result, when the brush 71 is arranged corresponding to the sectors 60, 61, the electric motor 17 is energized, so that the brush 71 is rotated until it is located corresponding to the sectors 65, 66, the movable disk 108 is also rotated accordingly and the valve 11 closes and in this closed position during the tent from t to t _? persists.

At

In the following period, in which the differential amplifier provides 27 different signals, the opening time changes of the valve 11 (t ^ t) with regard to the length of time (^ 't'') · ^This applies similarly for subsequent' periods so that in this way a regulation of the opening time of the valve 11 is achieved for each time segment, depending on the difference between the effective value of the air temperature of the passenger compartment 8 and the desired target value the valve 11 and thus the amount of heat that is taken from the heat exchanger 1 with the air conveyed into the passenger compartment 8.

If the temperature in the passenger compartment 8 is significantly higher than the target temperature, the valve remains continuously closed according to the illustration in FIG. 5b sen. If the temperature of the passenger compartment 8 is significant is less than the setpoint value, the valve 11 remains for a longer or shorter time accordingly the control signal of the transistor 55 for several in Fig. 5c shown periods of time open.

The circuit with the differential amplifier 48 supplies a correction signal to the input 34 of the amplifier 35, depending on the rate of change of the signals supplied by the sensors 13, 16 per unit of time to the inputs 51, 47, respectively get over integrating and differentiating circuits.

According to FIG. 2, the transistor 55 can be a dashed line depicted. Switches 130 are connected in parallel, which can be closed 'if the electronic Control circuit of the transistor 55 fails, so that the

Cathodes of the diodes 57, 58 are grounded and therefore also the sectors 60, '61, while the sectors 65, are applied to positive voltage by the transistor 64 is switched off and therefore the electric motor 70 is acted upon in such a way that the valve 11 is in the closed position moves.

A mechanical adjustment of the movable Disk 108 can be reached by inserting it into the outside via the spindle 95, for example with a upper slot 118 inserted screwdriver adjusted will. ■

The advantages of the device according to the invention are obviously that the temperature set with the aid of the potentiometer 25 is reached in the passenger compartment 8, regardless of the operating speed of the machine, the vehicle speed and the outside temperature. Predetermined limits are, for example - 18 ⁰ C and + 18 ° C. In addition, the passenger compartment of the vehicle is warmed up quickly during a cold start and a quick reaction to temperature changes, which are set with the potentiometer 24. Because of the sequence of opening phases of the valve 11 of approximately 5 seconds each, there is no perceptible fluctuation in the temperature in the foot region of the vehicle users. The presence of an electronically controlled motor to regulate the flow rate of the water through the heat exchanger also offers various advantages, such as low noise, such as the possibility of arranging the unit 10 close to the passenger compartment and the relatively low operating forces for interrupting the flow of water from the inlet line 2 to the heat exchanger 1.

Without departing from the scope of protection of the invention, the device described as an embodiment
be changed in whole or in part, for example
by another valve 11 and a different monitoring circuit 12. The line 21 for flushing the sensor 16 can also be omitted.

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Claims (15)

PATENTANWÄLTE "w H. STURIES .__.. ^ .. ,, V ...- 'DIPL-ING. P. EICHLER J O I 3 4 Ö BRAHMSSTRASSE 39, 5600 WUPPERTAL 2 speech; ■ 1. Device for automatic temperature control of air supplied to the passenger compartment of a vehicle equipped with a heat engine with a heat exchanger hydraulically connected to a cooling water circuit of the machine, and with one pushing the air supplied to the passenger compartment through the heat exchanger Conveyor device, characterized in that there is a valve (11), that to regulate the flow rate of the through the Heat exchanger (1) flowing water from an electric motor (70) is controllable and that for measuring the air temperature in the passenger compartment (8) in relation to a desired setpoint value and an electronic one for controlling the electric motor (70) accordingly Monitoring circuit (12) is present. 2. Device according to claim 1, characterized in that that the valve (11) can be actuated by rotating the electric motor (70). 3. Device according to claim 2, characterized in that that the valve (11) has two opposite and transverse to the water flow arranged disks (102, 108), of which one (102) fixed and the other (108) can be driven by rotating the electric motor (70) and that both disks (102, 108) each have at least have a through hole (105, 111). 4. Apparatus according to claim 3, characterized in that that a control device for controlling a rotation of the drivable Disc (108) with a stop device for stopping the electric motor (70) and thus the Disc (108) in at least two of an opening and positions corresponding to a closed position of the valve (11) are connected to one another. 5. The device according to claim 4, characterized in that the stop device has an angularly attached to the control device brush (71) with two different lengths and on two printed circular paths (62, 68) of different diameters sliding arms (72, 73), of which the first circular path '(68) is uninterrupted and connected via the electric motor' (70) to a terminal of a first polarity, and of which the second circular path (62) .interrupted and first: sections (67) ^: comparatively great length and connected with a terminal of the first polarity of opposite polarity and second sections (60, 61, 65, 66) which are spaced apart and angularly arranged according to the opening and closing positions of the valve (11) and are electrically connected to the monitoring circuit (12) . 6. Apparatus according to claim 4 or 5, characterized g e k e η η ζ e i c h η e t that the control device for controlling the rotation of the drivable Disc "(108) · can be operated by hand .. 7. Device according to one of claims 4'to 6, characterized, that the control device, the electric motor (70) and the stop device are housed in a housing (78) which is mechanically connected to a housing (75, 76) of the valve '(11) assembled is. 8. Device according to one of claims 1 to 7, d adurch marked that the Monitoring circuit (12) a user loaded ' actuatable actuator for generating a first electrical signal as a puncture of the desired Setpoint of the air temperature of the passenger compartment (8) has that sensor (13, 16) for measuring the temperature the air supplied to the passenger compartment '(8) are present, and that a circuit for generating / a control signal for the electric motor (70) is present is. 9. Apparatus according to claim 8, characterized in that en η ζ ei c h η et that the actuator a arranged in the dashboard (17) of the vehicle Has potentiometer (24) '. 10. Apparatus according to claim 8 or 9, d a d u r c h g e k e η η ζ e i c h η e t that a first feeler (16) for measuring the air temperature of the passenger compartment (8) and a second sensor (1'3) are available which is the temperature of the passenger compartment (8) can be fed through a channel (6) from the heat exchanger (1) Able to measure air. _ ₄ _ 351946G 11. The device according to claim 10, characterized g e k e η η ζ ei c h η et that a pipe system (18, 21, 14, 15) to wash around the sensor (16) with the air present in the passenger compartment (8). ■ 12. The apparatus of claim 11, d a d u r c h g ek e η η ζ 'e i c h η e t that an air from the Passenger compartment '(8) deducting from the sensor (16) Line (21) is present, which is in a suction area a nozzle (14) of the air duct (6) leading from the heat exchanger (1) to the passenger compartment (8) flows out. 13. Device according to one of claims 8 to 12, characterized in that the circuit for generating a control signal for the 'electric motor' (70) a comparator (27) for comparing the first electrical setpoint signal with that through the feelers. (13, 16) delivered 'has a third electrical signal to a frequency modulator (35) supplies, which via a circuit (4O) 'a fourth capable of delivering an electrical signal for controlling the electric motor (70) with two alternative levels. 14. The device according to claim 13, characterized ζ e i c h η e t that the input of the frequency modulator (35) in addition to the third electrical signal, a fifth electrical signal the temporal change in the signals of the sensors (13, 16) reägibleri detectors' (4Ö) can be supplied. 15. The device according to claim 13 or 14 ^: or one of claims 6 to: 12 ,. as a result indicates that the output of the Circuit (40) for controlling the Verdreheris and stopping the electric motor (70) for adjustment of the valve (11) in its open and closed position with the two levels of the fourth electrical Signal connected to the second sections (60, 61, 65, 66) of the second circular path '(62)' is. ■