JPS6253214A - Air conditioner for car - Google Patents

Abstract

PURPOSE:To improve the interchangeability of each specification by permitting a controller for determining the opening degree position of an air mix damper to be used in common in the automatic air conditioning specification and in the manual air conditioning specification by changing the resistors for providing the input signals in the controller. CONSTITUTION:The controller 2 for an automatic air conditioner consists of a temperature setting resistor R1 for providing an aimed car-interior temperature, opening-degree position detection resistor Rpo in which the resistance value varies according to the opening degree of an air mix damper, inside air temperature detection resistor Rr in which the resistance value varies according to the representative car-interior temperature, and an outside air temperature detection resistor Ram in which the resistance value varies according to the representative outside temperature. When the automatic air conditioner is changed to the manual specification in this case, the above-described resistors Rr and Ram are demounted, and a resistance Rc for intermediate adjustment for the air mix damper is connected to the resistor Rpo. In order to suppress the variation of the resistance R1, a resistor RX1 is connected in parallel to the resistor R1. Further, a resistor RY1 is connected in seried with the resistor R1, and correction is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automotive air conditioner (hereinafter referred to as a car air conditioner), and particularly to improving the compatibility between automatic air conditioner specifications and manual air conditioner specifications. □〔
BACKGROUND ART As is well known, air mix type car air conditioners are broadly classified into automatic air conditioners and manual air conditioners.

An automatic air conditioner detects the temperature inside and outside the vehicle interior, the presence or absence of sunlight, etc., and automatically adjusts the opening of the air mix damper using a control device to bring the interior of the vehicle to a target temperature. Therefore, in an automatic air conditioner, the power i is -
Setting the target temperature inside the molding chamber has the advantage that the control device performs feedback control in response to temperature changes inside and outside the vehicle interior, which frees the occupants from the hassle of adjusting the temperature.

On the other hand, with a manual air conditioner, in order to maintain the vehicle interior at the target temperature, the occupants must respond to temperature changes inside and outside the vehicle.
It is necessary to change the opening degree of the air mix damper in some way. For this reason, most manual air conditioners currently use a one-wire type. This method is
The temperature adjustment knob on the control panel installed inside the vehicle and the air mix damper are mechanically connected with a wire.
The opening degree of the air mix damper is adjusted by manually operating the above knob.

In this one-wire type, the air mix damper is moved by the human power of the passenger, so the operation feeling is poor, and this causes trouble in driving, especially when the driver adjusts the temperature. Therefore, recently, Ij Ij who chose to come to Japan! A system has been devised that converts temperature into an electrical signal and operates an actuator in response to this electrical signal to drive an air mix damper. As the L actuator, a negative pressure actuator that adjusts negative pressure by switching a solenoid valve and drives a damper 31-1 based on this negative pressure, and one that uses an electric motor are known.

[Problem that the invention seeks to solve]

By the way, if we look at the current usage of car air conditioners, there are cases where manual air conditioners are changed to automatic air conditioners depending on user requests.

Therefore, in order to be able to switch from the manual specification to the auto specification at low cost and at In speed, it is desired to have as much compatibility between the manual specification and the auto specification as possible.

In order to satisfy such demands, the inventors of the present invention studied the compatibility between the automatic specification and the manual specification, and found the following problems.

First, the control method of the automatic air conditioner will be briefly explained using FIG. 5.

The automatic air conditioner control device 2 includes a setting resistor R1 for giving a target temperature in the vehicle interior, a resistor R2° whose resistance value changes depending on the opening degree of the air mix damper, and a resistor corresponding to the representative temperature in the vehicle interior. Connected are an intrinsic resistance Rr whose value changes and a negative resistance R0 whose resistance value changes depending on the representative temperature outside the vehicle.

Here, when R2=RPO+Rr'' Ram, the control device 2 controls the opening degree of the air mix damper so that the ratio of the resistance R3 and the resistance R2 is constant. In other words, the relationship between the resistance R1 and the resistance R2 is is, R,= ,R,+c ・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・(It is expressed by the formula 11 (a is the slope, C is a constant), and is shown by the real straight line A in Fig. 4. In other words, Fig. 4 , set the resistance R2 to R2゜(
(equivalent to target temperature 20°C) to Rzz (equivalent to target temperature 30°C)
), the air mix damper reaches Max.
From cool (it large cooling position) to Max hot
(maximum heating position), and due to this position change, the value of resistance R1° also changes, and the composite IN, In R+ becomes R
It changes from 1 to Rro.

Therefore, the inventors of the present invention have developed resistors R, , R for detecting internal and external air temperatures.
, , by connecting a fixed resistor R0 to the resistor RPO as shown in FIG. 5, it was thought that this controller could be used as a manual air conditioner.

Adjust the resistance R, <7) value to 11 (anti-R + key 41i).
'When the temperature is 1 degree and 25 degrees Celsius, the air mix damper reaches its maximum.
It is only necessary to select an intermediate point between cool and Max hot.

However, upon further study by the inventors, we found that although the midpoint position of the damper can be adjusted, the position of the straight line A in Figure 4 may vary depending on the vehicle equipped with the car air conditioner.

As shown in Figure 2, it was discovered that the problem was that the air conditioner was not able to be controlled accurately, unlike when it was first used for automatic air conditioners.

In other words, when the slope is too large, as in the case of straight line A, the control area moves from CA to C1,l, and becomes narrower than the automatic control area 1. Therefore, by slightly changing the value of the setting resistance R, the Air Nox damper can be set to Max hot.

Max becomes cool.

Also, if the slope is too small, such as a straight line, the operating range of the air mix damper will shift from M to M, which will be smaller than the auto specification. Therefore, even if the value of the set resistance R2 is changed to a large value, for example, to a value corresponding to the target temperature 20'C, a problem occurs in that the air mix damper does not operate to the Maxcoo1 position.

The present invention has been made for the purpose of solving the above two problems and increasing the compatibility between automatic air conditioner specifications and manual air conditioner specifications.

[Means for solving problems]

In order to achieve the above object, the present invention provides an air mix damper that is disposed in the middle of a duct that sends air into a vehicle interior, and that adjusts temperature by changing the proportion of cold air and hot air. An opening position detection resistor whose electrical resistance value changes according to the opening degree of the damper, a setting resistor whose electrical resistance value changes according to the target temperature inside the vehicle, and a vehicle A control device for controlling the opening degree of the air mix damper so that the ratio of the resistance value of the opening position detection resistor to the resistance value of the setting resistor is constant in order to bring the indoor temperature to a target temperature. In the device, in the case of an automatic air conditioner specification, an inside/outside air sensor whose electric resistance changes according to temperature changes inside and outside the vehicle is connected to the opening position detection resistor or the setting resistance, and in the case of a manual air conditioner specification, the air A technical means is adopted in which the operating intermediate position adjustment resistor of the mix damper and the operating range adjustment resistor of the air mix damper are connected.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 shows the overall configuration of a car air conditioner with automatic air conditioner specifications. In FIG. 1, in a duct 8 for introducing air blown by a blower 2o into the vehicle interior 1, there is an evaporator 7 of a refrigeration cycle, a heater core 6 whose heat source is engine cooling water, and a side of this heater core 6. An air mix damper 9 is provided to adjust the distribution of the airflow passing through the bypass passage and the heater core. This air mix damper 9 is driven by the negative pressure actuator 4. Inside the negative pressure actuator 4, there is a diaphragm 4a that is displaced in response to negative pressure;
A spring 4b is provided that biases the damper 9 in a direction opposite to this direction of displacement, and adjusts the opening degree of the damper 9 according to the magnitude of the pressure supplied by the pipe 40. The pressure introduction part 3 of the pipe 40 branches into two parts, one 40a is connected to the atmosphere, and the other 40b is supplied with negative pressure from the engine intake manifold, both of which are connected to the solenoid valve 3a.
, 3b are provided. This solenoid valve 3a.

3b receives a command from the control device 2 and performs an air operation.

The damper 9 is turned on and off to drive it to the target position, and the necessary pressure is supplied to the negative pressure actuator 4.

The automatic air conditioner control device 2 includes a temperature setting resistor R1 for providing a target temperature in the vehicle interior, an opening position detection resistor R1° whose resistance value changes depending on the opening degree of the air mix damper, and a representative temperature in the vehicle interior. An inside temperature detection resistor Rr whose resistance value changes according to the temperature outside the vehicle and an outside temperature detection resistor R whose resistance value changes according to the representative temperature outside the vehicle are connected. Here, R2=RPO+r? If r +Rm+e, the control bag W2 is connected to the resistor R1 and the resistor R as described above.
The opening degree of the air mix damper 9 is controlled so that the ratio with 2 is constant.

In other words, the connection relationship between the resistors R1 and R2 and the control device in the case of an automatic air conditioner specification is shown in FIG. 5 described in -1-.

Next, a case will be described in which the automatic air conditioner specification having the above configuration is changed to the manual air conditioner specification.

First, a case will be described in which a line having characteristic 11, which is not shown in line A in FIG. 4, is corrected to line A.

In this case, the resistors R, , R, , are removed and the intermediate adjustment resistor Rc of the air mix damper 9 is connected to the grinding wheel I5RPO. Furthermore, as shown in FIG. 2, a temperature setting resistor R1
In order to suppress the change in , resistor RX is connected in parallel with resistor R,
, connect. Also, since the middle point of the air mix damper 9 shifts due to kneading, ill; is corrected by connecting the claw 1 bar R71 in series to the light R1.

Therefore, if the resistance R1 after correction is R1・, then R1・−1
/ (1/R1+1 /RXI) -1' I? H...
(2) Here, the resistances R23 and R24 shown in FIG. 4 are Rz3=1/ (+/R
2゜+1/Rx+) ”Rye・・・・・・・・・
・・・・・・・・・(Formula 3) %Formula% ・・・・・・・・・・・・・・・(Formula 4) Above R23,
Since R24+ R2□ and R2° are determined by measurement, RXl+ RYI can be determined by combining equations 3 and 4.

Next, a case will be described in which the characteristic shown by double line A in FIG. 4 is corrected to straight line A.

In this case, if the change in resistance R2 is made smaller than the auto air conditioner (type 1), it will be 3L.For this reason, as shown in Fig. The target temperature of the midpoint of mix damper 9 is 25°C.
In order to adjust the voltage, a resistor R7□+RC is connected in series with the resistor Rro.

Therefore, if the resistance R2 after correction is R2・, then Rz・=
1/ (1/RPO+ l/Rxz) +Ry2-1-
1'? (................................... (Formula 5) where the resistance R13 shown in FIG. 4) RI4 is Rrx-
1/(]/R+o+'1/Rxt)4Ryz'+Rc・
・・・・・・・・・・・・・・・(i(6)RI4=1/
(1/R12+l/Rxt)10Rvz+)? .

Since it is determined by (Formula 7), the value of resistance RX2+R't2 can be determined by combining 26.7.

As described above-1-, according to this example, the resistors R,, R,, for detecting the inside air temperature, and the resistors RX1. Rye,
By simply exchanging Rc or RX1+ Rvz, Rc, it is possible to easily change between automatic air conditioner specifications and manual air conditioner specifications. That is, according to this example, the actuator and control device for driving the air mix damper 9 can be shared in both specifications, so that, for example, the specification changeover from manual to automatic can be performed quickly and at low cost.

It goes without saying that the drive actuator for the air mix damper 9 is not limited to the above-mentioned negative pressure type, but may also be an electric motor or the like.

〔Effect of the invention〕

-1- As described above, according to the present invention, the control device that determines the opening position of the air mix damper can be shared between the automatic air conditioner specification and the manual air conditioner specification, and the control device provides an input signal. By just slightly changing the resistors, you can achieve the excellent effect of being able to change between manual and automatic specifications at low cost and quickly without making major changes to the system.

[Brief explanation of drawings]

Figure 1 is a system configuration diagram of the automatic air conditioner specification of the present invention, Figures 2 and 3 are connection tangent diagrams of resistances to the control device 2 of the manual air conditioner specification of the present invention, and Figure 4 is the resistance shown in Figure 5. A characteristic diagram showing the relationship between R+ and Rz, and FIG. 5 is a connection tangent diagram of resistance to the control device 2 of automatic air conditioner specification. 2...Control device, 4...Negative pressure actuator, 9.
・Air mix damper, R1 ・Temperature setting resistor,
R.P. ...Opening position detection resistance, Rr...Inside temperature detection resistance,
R1,...Outside temperature detection resistance + R)ll, RX2・
・・Operating range adjustment resistor, Rye, Rvz, Rc・・
・Operation intermediate position W adjustment resistance.

Claims (1)

[Claims] An air mix damper that is disposed in the middle of a duct that sends air into a vehicle interior and that adjusts the temperature by changing the proportion of cold air and hot air; An opening position detection resistor whose electrical resistance value changes; a setting resistor whose electrical resistance value changes according to the target temperature inside the vehicle; and a control device that controls the opening of the air mix damper so that the ratio of the resistance value of the opening position detection resistor to the resistance value of the setting resistor is constant. In the case of an automatic air conditioner specification, an inside/outside air sensor whose electric resistance changes according to temperature changes inside and outside the vehicle is connected to the resistor or setting resistance, and in the case of a manual air conditioner specification, a resistance for adjusting the intermediate position of the air mix damper is connected. and an air conditioner for an automobile, wherein an operating range adjustment resistor of the air mix damper is connected.