JPH0321820B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a control mechanism for driving equipment in a vehicle air conditioner, for example, a blower for introducing inside and outside air, a mode switching door for setting the air blowing direction, a compressor, and other driving equipment. It is related to the mechanism of

In general, vehicle air conditioners have internal and external air switching doors,
It has driving equipment such as a blower, evaporator, air mix door, heater core, mode switching door, etc., and by controlling these, it is possible to air condition the vehicle interior. Figures 1 and 2 show an example of this vehicle air conditioning system and a control circuit for controlling this system. An internal/external air switching door 4 is provided between the inlet 3 and the internal/external air switching door 4.
is controlled by a motor actuator 5. Air from the inside and outside air inlets 2 and 3 is introduced into the duct 1 by a blower 6, and an evaporator 7, an air mix door 8, a heater core 9, and mode switching doors 10 and 11 are arranged in this order on the downstream side of the blower 6. The evaporator 7 constitutes a cooling cycle with a compressor 12, a condenser 13, a liquid receiver 14, and an expansion valve 15, and rotational force from an engine pulley 16 is transmitted to the compressor 12 via a magnetic clutch 17. The air mix door 8 adjusts the mixing ratio of the cold air from the evaporator 7 and the warm air from the heater core 9, and is controlled by a motor actuator 18. Note that in conjunction with the opening and closing of the air mix door 8, the water tap tank 19 is opened and closed, and the amount of heating of the heater core 9 is adjusted. The mode switching doors 10 and 11 adjust the amount of air blown out from the face outlet 20, the foot outlet 21, and the defrost outlet 22. These doors 10 and 11 are controlled by a motor actuator 23. Ru.

Reference numeral 24 denotes a control circuit, which is configured as shown in FIG.
8, inside and outside air setting device 29, automatic control setting switch 30, outside air temperature sensor 31, inside air temperature sensor 3
2. The vehicle interior temperature can be automatically adjusted by inputting a signal from the evaporator temperature sensor 33, etc., and controlling the motor actuator 5, 18, 23, blower 6, and electromagnetic clutch 17 based on this signal. can.

In FIG. 2, the control circuit 24 is connected to the air volume setting device 3.
A blower control circuit 36 that sets the rotation speed of the motor 49 constituting the blower 6 to, for example, low, medium, or high speed according to the operation amount of the air blower 5; a compressor control circuit 37 that controls the electromagnetic clutch 17 for compressor control; Motor actuator 2 for switching
a mode door control circuit 39 that controls the stop position of the motor 38 that constitutes the motor actuator 3; an inside/outside air switching door control circuit 41 that controls the stop position of the motor 40 that constitutes the motor actuator 5 for switching between inside and outside air; motor actuator 18
The air mix door control circuit 43 and the like are provided to control the motor 42 that constitutes the air mixer door. The compressor control circuit 37 turns off the compressor in the warm air blowing mode and turns on the compressor in the cold air blowing mode. The output signals of "1" or "0" from each output port 39a, b, c, d of the mode door control circuit 39 are sent to each normally closed switch 54.
57 to one input of the motor 38. The other input side of this motor 38 is grounded. The normally closed switch 54 is turned off at the position when the motor 38 switches the mode switching doors 10, 11 to the defrost blowing mode, stopping the motor 38 and maintaining the doors 10, 11 in the defrosting blowing mode. Normally closed switch 55
The motor 38 is turned off at the position when the mode switching doors 10, 11 are switched to the foot blowing mode, and the motor 38 is stopped.
Hold in foot blowout mode. Normally closed switch 5
6, the motor 38 is turned off at the position when the mode switching doors 10, 11 are switched to the bi-level mode, and the motor 38 is stopped;
11 in bilevel mode. The normally closed switch 57 is configured so that the motor 38 is connected to the mode switching door 10,1.
1 is switched to the ventilate mode, the motor 38 is turned off and the motor 38 is stopped, and the doors 10 and 11 are held in the ventilate mode. Therefore, when a signal of "1" is input to any of the normally closed switches 54 to 57, the mode of the mode switching doors 10, 11 is set to the mode corresponding to this normally closed switch 54 to 57. Each output port 41 of the inside/outside air switching door control circuit 41
The "1" or "0" output signals from a, b, and c are supplied to one input side of the motor 40 via each normally closed switch 64-66. motor 4
The other input side of 0 is grounded. The normally closed switch 64 is turned off when the inside/outside air switching door 4 is set to the inside air introduction mode, the normally closed switch 65 is turned off when the door 4 is set to the outside air introduction mode, and the normally closed switch 66 is turned off when the door 4 is set to the outside air introduction mode. 4 is set to a mode that introduces both inside air and outside air. A motor 42 is connected between the output ports 43a and 43b of the air mix door control circuit 43, and a detector 48 detects the opening degree (position) of the air mix door 8 rotated by the motor 42.
The rotational position of the motor 42 is set so that the difference between the output signal from the output terminal 26a of the temperature setting device 26 and the output signal from the output terminal 26a of the temperature setting device 26 becomes zero. That is, the air mix door 8 is adjusted in accordance with the set value of the temperature setting device 26.
The opening degree is controlled.

However, according to the conventional vehicle air conditioner, the electric circuits include a blower control circuit 36, a compressor control circuit 37, and a mode door control circuit 3.
Since various control circuits such as 9 are required, the circuit configuration becomes complicated, and furthermore, when these are constructed from semiconductor elements, there is a risk of malfunction due to thermal effects, external noise, etc. In addition, since hysteresis of each of the above-mentioned sensors and misalignment of the actuator occur, it is necessary to individually adjust the switching point of the mode switching door and the switching point of the blower related to the air mix door, which causes problems such as time-consuming assembly work. The dot was hot.

An object of the present invention is to eliminate the above drawbacks by providing a switching mechanism for mechanically controlling each of the drive devices described above, and will be described in detail below using examples. Note that the same parts as in FIGS. 1 and 2 will be described using the same reference numerals.

The present invention focuses on the fact that the blower, blowout mode, compressor, etc. are controlled in a certain correlation with respect to the operation of the air mix door 8, as shown in FIG. That is,
As shown in FIG. 3d, in the process of rotating the air mix door 8 from the warm air blowing mode (heater mode) side to the cold air blowing mode (cooler mode) side, the rotation speed of the blower 6 changes from high speed to low speed and then again. The blowing mode changes from heater mode, which blows air from the feet, to bilevel mode, which blows air from both the feet and the face, and then to ventilate mode, which blows air from both the feet and the face. , the mode is changed to blowing air from the face direction. Further, the compressor is controlled so that it is turned off in the heater mode and turned on in the cooler mode. Therefore, in the present invention, a movable contact that is interlocked with the air mix door and a fixed contact that faces the movable contact constitute a switching mechanism that controls each drive device, and the output signal of this switching mechanism is used to control the switching mechanism shown in FIG. 3a. , b, and c to eliminate the above drawbacks, and will be explained in detail below using examples.

FIG. 4 shows the internal structure of the actuator 18 that drives the air mix door 8. An output shaft 18a for rotating the air mix door 8 via a link is provided with an output gear 18b consisting of a spur gear. 18b is driven by the motor 42 via an intermediate gear 18c. A movable contact 18f is provided on a substrate 18g provided on the output gear 18b, and this movable contact 18f is
Printed circuit board 18i provided in lower case 18h
The sliding contact 18e printed on the surface side according to the pattern shown in FIG.
A stopper circuit is constituted by e. This stopper circuit cuts off the motor input when the air mix door 8 enters the full cooler mode or full heater mode and comes into contact with the inner wall of the duct, thereby preventing a high load from being applied to the motor 42 and burning out. It is. As shown in FIG. 5, the substrate 18i has a sliding contact 18k constituting a potentiometer for detecting the opening degree of the air mix door 8.
is provided, and the substrate 18 is connected to this sliding contact 18k.
By making contact with a contact (not shown) provided at g, an output signal corresponding to the opening degree of the air mix door can be obtained.

In FIG. 5, on the surface of the printed circuit board 18i, there are a blower control sliding contact 70, a mode control sliding contact 71, and a compressor control sliding contact 72 along the outer periphery of the bearing hole 18x of the output shaft 18a. It is formed over sections θ ₁ , θ ₂ , and θ ₃ . The blower control sliding contact 70 is configured as shown in FIG. 6, and in this case, the air mix door 8 moves from the full heater mode side to the full cooler mode side on the substrate 18g of the output gear 18b. In the process, a movable contact 70a that moves within the range θ ₁ is provided, and this movable contact 70a consists of three contacts 70a ₁ , 70a ₂ , and 70a ₃ , and moves along the movement locus of the contact 70a ₁ . A common contact 70b is provided, and the section θ ₁ is
When the air mix door 8 is set to the full heater mode region and the full cooler mode region, the movable contact 70a is located in the section θ ₁ a, and when the opening degree of the air mix door 8 is set to the intermediate position region, the movable contact When _the opening degree of the air mix door 8 is located in an area slightly shifted toward the full heater side or the full cooler side than the intermediate position area, the movable contact 70a is located in the corresponding area θ ₁ b. Separated. In this case, along the movement locus of the contact 70a ₂ , the contact 70c is provided in the range θ ₁ a, the contact 70d is provided in the intermediate θ ₁ c range, and along the movement trajectory of the contact 70a ₃ , the contact 70c is provided in the range θ 1 a. A contact 70e is provided in the range _1b . The common contact 70b is connected to a terminal 70f of the electric circuit shown in FIG.
f is connected to a power supply 70k via a manual switch 70j, a contact 70c is connected to a terminal 70g, and this terminal 70g is grounded via a motor 49, and the contact 70e is connected to a terminal 70h, and this terminal 70h is connected to the motor 49 via a diode 70l and a resistor 70m, and a contact 70d is connected to a terminal 70i, which is connected to a resistor 70m via a diode 70n and a resistor 70o. The above contact point 70
c, 70d, and 70e constitute a first switching contact.

Therefore, according to the above configuration, when the movable contact 70a is assumed to slide from one end of the section θ ₁ to the other end in the process of rotating the air mix door 8 from the full heater mode side to the full cooler mode side. , in the interval θ ₁ a, the contact 70a conducts between the common contact 70b and the contact 70c, so that the current I ₁ flows through the motor 49, and the motor 49 is operated at high speed. Also, in the range of interval θ ₁ b,
Since contact 70a conducts between common contact 70b and contact 70e, current _I2 flows to motor 49, and motor 49 is operated at medium speed. In addition, in the range θ ₁ c, the contact 70a conducts between the common contact 70b and the contact 70d, so the motor 49 has no current.
I ₃ flows, which causes the motor 49 to operate at a low speed. That is, as the air mix door 8 rotates, the common contact 70b moves in the process in which the movable contact 70a interlocked with the rotation moves over the section _θ1 .
The contacts 70c, 70e, and 70d are turned on and off. Thereby, the motor 49 can be automatically controlled in response to the rotational movement of the air mix door 8. Note that the manual switch 70j is controlled by adjusting the air volume setting device 27, and the manual switch 70j is controlled by adjusting the air volume setting device 27.
can be manually set to high speed, medium speed, or low speed, and by operating the automatic control setting switch 30, this manual switch 70j is brought into contact with the automatic control contact 70p, whereby the common contact 7
Current can flow to the 0f side, allowing automatic control.

The mode control sliding contact 71 is constructed as shown in FIG.
In the process of moving from the full heater mode side to the full cooler mode side, the movable contact 80a, which moves over the interval θ ₂ in conjunction with this, moves the substrate 18
This contact 80a is constructed of contacts 80a ₁ , 80a ₂ , and 80a ₃ , and the common contact 80 is attached to the section θ ₂ in which this contact 80a moves.
b is provided. Further, in the range of the section θ ₂ , there is a contact part 80c which corresponds to the common contact 80b and which controls the mode switching doors 10, 11 when the compressor is on, and a contact part 80c which controls the mode switching door 10 and 11 when the compressor is off. , 11 is formed. The contact portion 80c is
The contact 80a ₂ is provided along the movement trajectory, and the contact 80d is provided along the movement trajectory of the contact 80a ₃ .
c and 80d are heater mode setting contacts 80c ₁ and 80d 1, bi-level mode setting contacts 80c 2 and 80d 2, and ventilate mode setting contacts 80c 1 and 80d ₁ , bi-level mode setting contacts 80c ₂ and 80d ₂ , along the movement trajectory of the contact 80a from the full heater mode side to the full cooler mode side. It is composed of setting contacts 80c ₃ and 80d ₃ . In this case, in the contact portion 80c, the length of the ventilate mode setting contact _80c3 is set to be the longest, and in the contact portion 80d, the length of the heater mode setting contact _80d1 is set to be the longest. In the contact portion 80c, a distance θ ₂ a between the heater mode setting contact 80c ₁ and the bilevel mode setting contact 80c ₂ and a distance θ ₂ between the bilevel mode setting contact 80c ₂ and the ventilate mode setting contact 80c ₃ are determined. b is biased towards the full heater mode side in the section θ ₂ , and in the contact portion 80d, the above-mentioned intervals θ ₂ a and θ ₂ b are biased towards the cooler mode side.
The intervals θ ₂ a and θ ₂ b are used to set the mode switching point. The heater mode setting contact _80c1 is connected to the switch 5 via the normally open contact 80e.
5, and also bi-level mode setting contact 8
0c ₂ is connected to the contact 56 via a normally open contact 80f, and is also connected to the ventilate mode setting contact 8
_0c3 is connected to the switch 5 via a normally open contact 80g.
Connected to 7. Further, the heater mode setting contact 80d ₁ is connected to the switch 55 via the normally closed contact 80h, and the bilevel mode setting contact 80d ₂ is connected to the switch 55 through the normally closed contact 80h.
It is connected to switch 56 via a normally closed contact 80i, and the ventilate mode setting contact _80d3 is connected to switch 57 via a normally closed contact 80j. The contacts 80e to 80j are controlled by a relay 80k which is energized when a control switch 17a for controlling the magnetic clutch 17 is turned on. In addition, common contact 8
A power supply 80l is connected to 0b. The contact portions 80c and 80d constitute a second switching contact.

Therefore, according to the above configuration, when the movable contact 80a moves over the interval θ ₂ in the process of moving the air mix door 8 from the full heater mode side to the full cooler mode side, the switch 17a is turned on and the magnet is turned on. When the clutch 17 is energized and the compressor 12 is in operation, the relay 80k is energized, so the contacts 80e, 80f, and 80g are turned on as shown in the figure, and therefore the movable contact 80a is turned on first.
is the common contact 80b and the heater mode setting contact 80
_c1 , and as a result, input is supplied to the motor 38 via the switch 55, so the inside/outside air switching doors 9, 11 are set to the foot blowing mode. Due to the self-holding function of the motor actuator 23, this setting state is maintained even if the contact 80a corresponds to the interval θ ₂ a, and the movable contact 80
a moves further and bi-level mode setting contact 8
When contacting _0c2 , the common contact 80b and the bilevel mode setting contact _80c2 become conductive, and the motor 38 is connected via the switch 56.
Since the input is supplied to the mode switching door 10,
11 is set to a mode in which air is blown out from both the feet and the face. This setting state is contact 8
It is held even if 0a corresponds to the interval θ ₂ b. Next, when the movable contact 80a contacts the ventilate mode setting contact _80c3 , input is supplied to the motor 38 via the switch 57, so that the ventilate blowing mode is set. Further, when the air mix door 8 moves from the full cooler mode side to the full heater mode side, the blowout mode is maintained at the ventilate mode in the interval θ ₂ b and in the bilevel mode in the interval θ ₂ a.
That is, as shown in FIG. 9b, the modes that are controlled as the air mix door 8 moves are: when the air mix door 8 moves from the heater mode side to the cooler mode side, and when the air mix door 8 moves from the cooler mode side to the heater mode side. A difference corresponding to the intervals θ ₂ a and θ ₂ b occurs at the time of mode switching. By providing such a dead zone region S, even if the position of the air mix door 8 changes at a position corresponding to the region S, the mode switching doors 10 and 11 are frequently switched, resulting in an inconvenient hunting condition. It disappears. Next, when the switch 17e is turned off and the compressor is placed in the stop mode, the relay 80k is deenergized and the contacts 80h to 80j are turned on, so the blowing mode is controlled by the contact section 80d. . In this case, since the sections θ ₂ a and θ ₂ b have been shifted to the full cooler mode side, the mode switching point is shifted to the full cooler mode side as shown in FIG. 9a. In this way, by setting the characteristics as shown in Figure 9a and b, when the compressor is turned on, the ventilate mode region can be widened, and the cold air can be spread over a wide range from the direction of the face. In addition, when the compressor is turned off, the heater mode area can be expanded, allowing warm air to be blown over a wide area and improving the air conditioning control inside the vehicle. can be done.

Sliding contact 7 for compressor control in Fig. 5
As shown in FIG. 10, No. 2 has a common contact 90a provided over an interval θ ₃ .
The section θ ₃ is divided into sections θ ₃ a and θ ₃ b. The above interval θ ₃ a is approximately 100% when the air mix door 8 rotates from the full cooler mode side to the full heater mode side and the amount of rotation reaches 100%. The range is up to 60% rotation, and the section θ ₃ b is the range up to 10% rotation. A contact 90c is provided over the range θ ₃ a, and a contact 90d is provided over the range θ ₃ b. In this case, the common contact 90a and the contact 90 are located on the movement trajectory of each contact 90b ₁ , 90b ₂ , 90b ₃ of the movable contact 90b provided on the substrate 18g.
c, 90d are located. The above common contact 90a
is connected to terminal 90e ₁ of connector 90e, and contacts 90c and 90d are connected to terminal 90e ₂ of connector 90e via resistors 90f and 90f.
The terminal 90e ₁ is grounded, the terminal 90e ₂ is connected to the inverting input side of an operational amplifier 90g functioning as a comparator, and the reference voltage Vp is supplied to the non-inverting input side of the operational amplifier 90g. still,
A power supply of voltage V is supplied to the inverting input side of the operational amplifier 90g via a resistor 90h. The resistors 90f and 90h are set to have the same low resistance value. The contacts 90c and 90d constitute a third switching contact.

Therefore, according to the above configuration, when the contact 90b is turned on with respect to each of the contacts 90a, 90c, and 90d, the terminal 90 of the connector 90e
Resistors 90f and 90f are connected in parallel to e ₁ and 90e ₂ , and only one resistor 90f is connected when contact 90b is turned on to common contact 90a and contact 90c. In addition, when the contact 90b is turned on only with respect to the common contact 90a, the terminals 90e ₁ and 9
The state is such that no resistor is connected between 0e _{and 2} . Therefore, the voltage Vs supplied to the inverting input side of the operational amplifier 90g is different from the contact 90b to the contact 90a,
When A is in contact with the three contacts 90c and 90d, the voltage is 1/3V, when B is in contact with two contacts, it is 1/2V, and when C is not in contact with either of the contacts 90c and 90d, the voltage is 1/2V. In this way, three types of voltages are supplied. Here, at the above reference voltage Vp, the output of the operational amplifier 90g is H.
When the reference voltage Vup is V>Vup>1/
Set it to 2V, and add a 90g amplifier.
When the output of is at L level, the reference voltage VLP is 1/
By setting 3V<VLP<1/2V, the output of the operational amplifier 90g changes to the movable contact 90b when the air mix door 8 moves from the full cooler mode to the full heater mode as shown in FIG. 11b. becomes the L level when it leaves the contact 90c, and when the air mix door 8 moves to the opposite side, the movable contact 9
When 0b turns on to contact 90d, it inverts from L level to H level, so this causes the first
A dead zone Z can be provided in the relationship between the output signals l ₁ and l ₂ shown in FIGS. 1b and 1c. Therefore,
By controlling the electromagnetic clutch for driving the compressor using such output signals l ₁ and l ₂ , it is possible to improve the feeling and prevent the compressor from hunting.

In addition, in the present invention, FIGS. 6, 8, and 1
As shown in Figure 0, movable contacts 70a, 80a, 90
By the switching mechanism constituted by b,
Although the present invention has been described as controlling a blower, a mode switching motor, and a compressor, the present invention is not limited thereto, and may include, for example, a display that displays the rotation speed of the blower,
Other drive devices such as an inside/outside air switching door may also be controlled. In other words, the display that displays the rotation speed of the blower may be configured to control the blinking cycle of a specific display based on a control signal for controlling the blower as shown in FIG. Control can be achieved by selecting one of them using the above signal.

As explained above, according to the control mechanism for drive equipment in a vehicle air conditioner according to the present invention, a switching contact is provided along the movement locus of a movable contact linked to an air mix door, and this switching mechanism is used to drive devices other than the air mix door. Since it is equipped with a circuit that provides a certain period of dead zone for the control of the circuit that controls the equipment, there is no need to configure it from an electronic circuit using semiconductor elements, etc. as in the past, and all control functions can be integrated on a single board. By providing fixed contacts, the structure can be simplified, and there is no risk of malfunction due to thermal effects or external noise, increasing the reliability of the control mechanism. Furthermore, the fixed contacts are on the same board. Therefore, positional deviation of each driving device and hysteresis of each control do not occur, and individual adjustment of the switching point of the mode switching door, the switching point of the blower, etc. related to the air mix door is not required.

[Brief explanation of the drawing]

1 and 2 are simplified configuration diagrams and block diagrams showing an example of a control mechanism for drive equipment in a general vehicle air conditioner, and FIG. 3 is a characteristic diagram showing the operation of the vehicle air conditioner, FIG. 4 is a sectional view showing an example of a motor actuator for driving an air mix door, FIG. 5 is a plan view showing an example of a control mechanism for a drive device in a vehicle air conditioner according to the present invention, and FIG. 7 are simplified configuration diagrams and circuit diagrams showing an example of controlling a motor for driving a blower, and FIGS. 8 and 9 a, b, and c are motors for driving a mode switching door. Circuit diagram and characteristic diagram showing an example of the control mechanism of
11 are a circuit diagram and a characteristic diagram showing an embodiment of a control mechanism for controlling a compressor. 18...actuator, 18a...output shaft,
18b... Output gear, 18g... Board, 70...
Sliding contact for blower control, 71... Sliding contact for mode control, 72... Sliding contact for compressor control,
70b, 80b, 90a...Common contact, 70
c, 70d, 70e...first switching contact,
80c, 80d...Second switching contact, 90
c, 90d...Third switching contact.

Claims (1)

[Claims] 1. Blower, inside/outside air switching door, mode switching door,
It is equipped with a drive device such as a compressor, an air mix door that adjusts the mixing ratio of cold air and warm air, and an actuator that drives the air mix door, and the actuator is composed of a motor and a spur gear rotated by the motor. In a vehicle air conditioner comprising an output gear and an output shaft provided on the output gear and rotating the air mix door, a board facing the output gear is provided in the actuator, and the output gear and the board are mutually connected. The surface facing the output gear is divided into sections for at least each of the blower control, mode switching door control, and compressor control along the rotational direction and radial direction of the output gear, and the output gear is divided into sections in each section. Three movable contacts electrically connected to each other in common are provided on each side so as to be spaced apart in the radial direction, and one of the three movable contacts is placed on the surface of the substrate in each of the divided sections. A common contact is always in contact, and the other two are intermittently in contact with each other as the air mix door rotates, and a plurality of switching contacts spaced apart by a set distance are provided, and when the movable contact contacts the switching contact. A blower control circuit, a mode door control circuit, and a compressor control circuit are provided, each of which controls a corresponding drive device other than the air mix door by a signal when the air mixer is separated from the air mixer, and a signal when the air mixer is separated from the air mixer. A control mechanism for drive equipment in a vehicle air conditioner, characterized by having a circuit that provides a certain section dead zone for controlling a switching door and a compressor.