JPS63297111A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To improve comfortableness by subtracting the value which is obtained by multiplying the difference between the outside air temperature and a prescribed value by an outside air gain as correction value from the control signal for a temperature controlling device, when the outside air temperature is below the prescribed value. CONSTITUTION:A controller 11 calculates the synthetic signal on the basis of the input information of a solar radiation quantity sensor 43, outside air temperature sensor 44, car compartment temperature sensor 45, and a car compartment temperature setting device 46. While, a prescribed value (a) of the outside air temperature is compared with a prescribed value (b) higher than the value (a). When the detected outside air temperature is between (a) and (b), a blower 16 and an air mixing door 18 are controlled by the calculated synthetic signal. When the detected outside air temperature is <a the value which is obtained by multiplying the value (a - outside air temperature) by each outside air gain is calculated, while if the detected outside air temperature is >b, the value which is obtained by multiplying the value (b - outside air temperature) by the outside air gain is calculated, and correction is performed by subtracting said obtained value from the synthetic signal. A temperature controlling device is controlled by the corrected signal. With each constitution, the comfortable air conditioning is permitted in all seasons.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicle air conditioner that controls the interior of a vehicle to a comfortable temperature even when the outside air temperature is low or high.

(Prior art) Conventional vehicle air conditioners that control vehicle interior temperature include:
For example, i) Japanese Patent Publication No. 59-39334, ii)
) There is one disclosed in Japanese Utility Model Application Publication No. 57-3023.

The device in i) above calculates and calculates control signals for switching between inside and outside air doors and controlling the opening of the mix door based on parameters such as the vehicle interior temperature, outside air temperature, mix door opening, and set temperature. This control signal controls the interior of the vehicle to reach the target temperature. In addition, the above control signal is
It is obtained by multiplying the outside air temperature parameter constituting this by a constant outside air gain, and the characteristic of the vehicle interior temperature Tr is as shown by the solid line A in FIG. 6.

Furthermore, when the outside air temperature is lower or higher than a predetermined temperature, the device of ii) above changes the flavor of the control characteristics by switching the outside air gain of the outside air temperature parameter that constitutes the control signal. The vehicle interior temperature is controlled depending on the season such as winter, and for example, the vehicle interior temperature characteristic when the outside air temperature is low is as shown by the broken line B in FIG. 6. still,
A two-dot chain line C in FIG. 6 indicates an ideal target temperature characteristic.

(Problem to be Solved by the Invention) However, according to the device i) above, since the control signal is composed of an outside air temperature parameter multiplied by a certain outside air gain, the outside air temperature T1 is When the outside temperature is low or below 0°C, the temperature inside the vehicle is controlled to a high temperature that exceeds the upper limit (30°C) of the comfortable temperature range (for example, 0°C to 30°C), as shown in Figure 6. In the summer, when the outside air temperature is higher than 30"C, the temperature may be controlled to a low temperature that exceeds the lower limit of the comfortable temperature. Particularly when the outside air temperature is low, the discomfort of the occupants increases. .

In addition, according to the device mentioned above, the temperature control exceeding the comfortable temperature like the device mentioned in i) is relaxed, but there is a problem that the temperature inside the vehicle varies greatly when the gain is changed, even though the outside air gain is changed. be. For example, if you switch the outside air gain with OoC when the outside air is low.

The characteristics change with a step from point S to point t in FIG. 6, and as a result, the performance changes greatly and the temperature inside the vehicle significantly changes to the low temperature side.

Therefore, the present invention solves the above problem by subtracting the extra correction amount from the control signal at least when the outside air is low, which increases discomfort, and makes it possible to control the inside of the vehicle at a comfortable temperature all season long. The purpose is to provide a vehicle air conditioning system.

(Means for Solving the Problems) The vehicle air conditioner of the present invention includes at least a temperature setting device that arbitrarily sets the vehicle interior temperature, a vehicle interior temperature sensor that detects the vehicle interior temperature, and a vehicle interior temperature sensor that detects the temperature of the outside air. A vehicle air conditioner comprising an outside air temperature sensor that detects the outside air temperature, and a calculation means that calculates a control signal for controlling various temperature control devices such as a mix door based on each of these output signals, A correction means is provided for subtracting from the control signal a calculated value obtained by subtracting the outside air temperature from the set temperature and multiplying the outside air gain when the outside air temperature detected by the sensor is at least below a predetermined set value. The configuration is such that control is performed using output signals from the.

(Function) However, if the outside temperature is higher than the predetermined set value,
The vehicle interior temperature is controlled by the control signal calculated by the calculation means, while when the outside air temperature is below a predetermined set value, it is controlled by the output signal calculated by the correction means. This is obtained as the characteristic shown by the dotted chain line C. Therefore, even if the outside temperature falls below the set value, the temperature inside the vehicle is controlled without exceeding the upper limit of the comfortable temperature inside the vehicle.

(Example) An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows an automotive character adjustment device 10, and FIG. 2 shows a schematic configuration of its control circuit 11. First, the air conditioner 10 will be described. The most upstream side of the tact 12 is equipped with an intake door 15 that switches between an inside air population 13 and an outside air population 14. Inside this tact 12, blowers 16 are installed sequentially from the upstream side.
, evaporator 17, mix door 18, heater core 1
A vent outlet 21 , a defroster outlet 22 , and a foot outlet 23 are provided on the most downstream side of the duct 12 and communicate with the vehicle interior 20 . These vent outlets 2
1 and the defroster outlet 22 are switched by a switching door 24 for mote switching, and the foot outlet 23 is switched by a switching door 25.
It is opened and closed by

The intake door 15 is driven by a motor actuator 33 to switch intake between outside air and mold room air. The air blower fi 16 is operated by the drive circuit 35 and sucks and introduces air into the tactile chamber 12 through the intake door 15. The evaporator 17 includes a compressor 26 that compresses and circulates the cold tofu, a condenser 27, and a receiver tank 28.
, and the expansion valve 29 constitute a cooler 30. This cooling a30 is driven by a pulley 31 to which power from an engine 41 is transmitted via a magnetic clutch 32. The air introduced by the blower 16 passes through the evaporator 17 and is cooled.

Also, engine cooling water is passed through the heater core 19, thereby heating the air that has passed through the evaporator 17. The ratio of air passing through this heater core 19 is set by the opening degree of the mix door 18.
is driven by a motor actuator 37. Each switching door 24, 25 for mode switching is driven by a motor actuator 39, and includes a vent outlet 21, a defroster outlet 22, and a defroster outlet 22. The heat outlet 23 is selected and conditioned air is sent into the vehicle interior 20.

Further, the opening degree of the mix door 18 is 0. The potentiometer 42 detects the intensity of solar radiation (
1t, an outside air temperature sensor 44 that detects the outside air temperature ta, a vehicle interior temperature sensor 45 that detects the vehicle interior temperature tr, and a vehicle interior 20 at a predetermined temperature tD.
These output signals are input to the control circuit 11 via an A/D converter 47.

The control circuit 11 is composed of a microcomputer having an I10 board, a CPU, a memory, etc. This microcomputer is used to calculate a total signal (control signal) 1 as shown in FIG.
A correction means 11b is configured to perform correction calculations. In the wave calculation means 11a, the total signal T is calculated based on each input data ts, ta, t, . The correction means 11b determines whether the detection signal ta from the outside air temperature sensor 44 is outside a predetermined range, and corrects the total signal T only if it is outside the predetermined range.

Then, the total signal from the calculation means 11a or the correction stage 1
The output signal from 1b controls the drive circuit 34 to switch the intake door 15, controls the drive circuit 36 to operate the cooling a 30 via the magnetic clutch 32, or controls the drive circuit 38 to switch the intake door 18. , control the drive circuit 40 to switch each switching door 24 and 25 to set the blowout mode, and
The configuration is such that the blower drive circuit 36 controls the amount of air blown by the blower 16.

Next, the calculation process of the overall signal of the air conditioner will be explained based on the flowchart shown in FIG. In addition, P, ~P, in the figure
indicates each step.

First, in step P, each sensor 43°44.4
Each detection signal from 1. ,1., tr and the output signal t of the temperature setting device 46. is loaded. Step P2 is
In the first correction stage 11a, each L2 signal t, ta, t
Using r and to, a total signal T for controlling various air conditioners is calculated according to the following formula.

T"t, +KA"t, +Ks't, Ko"t.

However, KA and Ks indicate their respective gains, and KA
, ta are correction terms based on the outside temperature.

Next, in step P3, the correction means 11b determines whether the outside air temperature ta is smaller than a predetermined value a, and in step P4, it is determined whether the outside air temperature ta is larger than a predetermined value a. That is, if the outside air temperature ta or the predetermined (1a a and b
It is determined whether or not it is within a predetermined range. The above predetermined value a
Alternatively, as shown in FIG. 4, the temperature is set to, for example, 0° C., and a predetermined temperature is set to, for example, 300° C.

In steps P3 and P4, if the outside air temperature ta is within the predetermined ranges a and b, in step P, various temperature control devices such as the blower 16 and the mix door 18 are driven based on the comprehensive signal T; Within a predetermined range between a and b in FIG. 4, normal vehicle interior temperature control is performed.

Further, when the outside air temperature tA is smaller than the predetermined value a in step P3, the correction means 11b performs the calculation 'r, ,=T-Ka (a-1,) in step P, . In step P5, based on the corrected output signal Ta, air is blown: W16 as shown in FIG.
and mix door TST temperature control. Incidentally, in the above, 11 represents the outdoor air gain, which may be the same as the above gain KA. That is, when the outside air temperature is below the predetermined outside temperature, in order to reduce the extra correction H, H based on the outside air temperature 1a of the general Shinsocho, the outside air temperature t, 4 is subtracted from the set temperature a, and the outside air gain is added to this fraction. The output signal Ta is obtained by multiplying by Ka and subtracting this value from the total signal T. As shown in Fig. 4, in the range where the temperature is below the predetermined temperature a, the output signal T is at the northern limit value. An initial correction is made so that C remains constant. Therefore, when the outside air temperature is low, the temperature inside the vehicle is prevented from rising too much, and comfort is maintained.

On the other hand, in step P4, if the outside temperature is 1ift, which is higher than the predetermined value, then in step P7, the correction means 11b performs a calculation such that Tb=T- (t, -b), and in step P5, Based on the output signal Tb, the fifth
As shown in the figure, the temperature of the blower 16, mix door 18, etc. is controlled. In other words, if the temperature is higher than the predetermined temperature,
The output signal Tb is obtained by subtracting the set temperature S from the outside air temperature t, multiplying this value by the outside air gain KA, and subtracting this value from the total signal T. This allows for extra correction based on the outside air temperature. As shown in FIG. 4, in a range where the temperature exceeds a predetermined temperature, the output signal Tb is corrected to reach a ceiling so that the lower limit value d remains constant. Therefore, when the outside temperature is high, the temperature inside the vehicle is prevented from becoming too low.

In this way, by controlling the outside air temperature to a certain limit value when outside the specified range, there is no need for extra correction due to the cabin temperature when the outside air temperature is low or high, so during all seasons, Comfortable temperature control can be expected, and since there is no humidity fluctuation caused by steps during gain switching as in the conventional case, smooth temperature control can be performed.

(Effects of the Invention) As explained above, according to the present invention, when the outside air temperature is at least below a predetermined set value, the calculated value obtained by subtracting the outside air temperature from the set temperature multiplied by the outside air gain is used for normal control. By controlling based on the signal subtracted from the signal, it is possible to prevent the interior of the vehicle from exceeding the upper limit of the comfortable temperature even if the outside temperature is below the set value, thereby eliminating the large temperature fluctuations associated with switching the outside air gain as in the past. Furthermore, it is possible to control the temperature comfortably in all seasons, thereby improving the sense of comfort for the occupants.

[Brief explanation of drawings]

1 to 5 relate to an embodiment of the present invention, in which FIG. 1 is a schematic configuration diagram of an air conditioner, FIG. 2 is a schematic configuration diagram of a control device, and FIG. 3 is a flowchart showing an outline of arithmetic processing. , Fig. 4 is a comprehensive signal characteristic diagram, and Fig. 5 is a diagram of the blower air volume and mi.
FIG. 6 is a characteristic diagram showing conventional temperature control control. 11a... Calculation means 11b... Correction means 16
．． 18...Temperature control device 44...Outside air temperature sensor 45...Interior temperature sensor 46...Temperature setting device a
...predetermined setting value K, ... outside air gain t1.
...Outside temperature T...Control signal T,...
・Output signal patent applicant Chisel Equipment Co., Ltd. Agent Patent attorney Mori
Tadashi Sumigoze (@gut)

Claims (1)

[Claims] At least, a temperature setting device that arbitrarily sets the temperature inside the vehicle, a temperature sensor inside the vehicle that detects the temperature inside the vehicle, an outside temperature sensor that detects the temperature of the outside air, and a mix door etc. based on their respective output signals. In a vehicle air conditioner equipped with a calculation means for calculating control signals for controlling various temperature control devices, when the outside air temperature detected by the outside air temperature sensor is at least below a predetermined set value, the temperature is lowered from the set temperature. An air conditioner for a vehicle, characterized in that a correction means is provided for subtracting from the control signal a calculated value obtained by multiplying a value obtained by subtracting the outside air temperature by an outside air gain, and the air conditioner is controlled by an output signal from the correction means.