JPS6144901Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a control device for an air conditioner used in an automobile, and in particular relates the opening and closing of an automobile door to the control of the air conditioner.

As a control device for an automobile air conditioner, for example, as shown in Japanese Patent Application Laid-Open No. 56-146416, input signals from a temperature setting device, a sensor inside the car, an outside air sensor, etc. are used as variables and are integrated according to a certain calculation formula. Determine the signal, and based on this comprehensive signal, the rotation speed of the blower,
Controls for the operating conditions of the compressor and the position of the air mixer door are already known.

However, in the past, the overall signal was determined according to a single arithmetic formula, so when a car door was opened to allow someone to get on or off, the response from the sensors inside the car was delayed and the temperature inside the car suddenly dropped to that of the outside air. There was a drawback that the temperature approached, impairing the sense of comfort for the passengers.

The purpose of this invention is to reduce the temperature change inside the vehicle due to the opening and closing of the vehicle door, as described above, and its gist is to detect the opening and closing of the vehicle door, and Means is provided for switching the computation of the overall signal so that the first arithmetic expression is used as the second arithmetic expression when the door is opened, and the second arithmetic expression is compared with the first arithmetic expression. This invention relates to a control device for an air conditioner for an automobile, which increases the influence of the input signal from an outside air sensor. Therefore, when the car door is open, the overall signal is determined by the second calculation formula that increases the influence of the input signal from the outside air sensor, so the deviation from the reference value is smaller than when calculated by the first calculation formula. The above problem can be achieved by, for example, increasing the rate at which the air mix door is moved to the full cool or full heat side.

Embodiments of the present invention will be described below with reference to the drawings.

In Fig. 1, to first explain the outline of an automotive air conditioner, an inside air inlet 2 and an outside air inlet 3 are formed in the form of two branches on the most upstream side of an air conditioning case 1. A switching door 4 is provided, by which the air to be introduced into the air conditioning case 1 is selected between inside air and outside air.

The blower 5 is for sucking air into the air conditioning case 1 and blowing it to the downstream side, and an evaporator 6 and a heater core 7 are provided on the downstream side of the blower 5.

The evaporator 6 constitutes a cooling cycle together with a compressor 8, a condenser 9, a liquid tank 10, and an expansion valve 11.
The heater core 7 is inserted into a hot water cycle in which engine cooling water circulates. The compressor 8
The rotation of the engine is transmitted through an electromagnetic clutch 12.

An air mix door 13 is located in front of the heater core 7.
is provided. This air mix door 13
The actuator 15 adjusts the ratio of air passing through the heater core 7 to air not passing through the heater core 7 depending on its position, and is operated by an actuator 15 in conjunction with a water tap 14 that adjusts the flow rate of hot water to the heater core 7.

The downstream side of the air conditioning case 1 includes an upper outlet 16,
It is divided into a lower air outlet 17 and a defrost air outlet 18 and opens into the vehicle interior, and mode doors 19 and 20 are provided in the divided portions, and each air outlet 16 to 18 that blows air into the vehicle interior is appropriately selected to select a mode. It is now possible to switch.

The control device according to this invention can automatically control three factors, for example, the rotational speed of the blower 5, the driving conditions of the compressor 8, and the position of the air mix door 13, to appropriately maintain and adjust the amount of heat generated by the air supplied into the vehicle interior. The circuit is shown in FIG.

That is, to explain the circuit shown in FIG. 2 with reference to FIG. 1 as well, 21 is the control device main body, 22 is a battery, 23 is an ignition key switch,
When the ignition key switch 23 is closed, power is supplied from the battery 22. 24 is a fan switch, 25 is an air conditioner switch, and 26 is a water temperature switch that detects the water temperature of the hot water circuit.
is composed of an automatic switch 24a, a high-speed switch 24b, and a low-speed switch 24c, and ON-OFF signals from the switch groups 24 to 26 are input to a microcomputer 36. Further, 27 is a temperature setting device that is varied by a temperature setting lever 32, 28 is an in-vehicle sensor that detects the temperature inside the vehicle, 29 is a solar radiation sensor that detects the amount of solar radiation, 30 is an outside air sensor that detects outside air temperature, and 31 is the above-mentioned It is a duct sensor that detects the temperature of the air that has passed through the evaporator 8,
The temperature setting device 27 and each sensor 28 to 31 are connected to a constant voltage circuit 33, and the set or detected temperatures Td, Tr, Ts, Ta, and Tm are input as voltage values to a multiplexer 34, and A/D conversion is performed. The signal is converted into a digital signal via the converter 35 and then input to the microcomputer 29. 37 is a potentiometer for detecting the position of the air mix door 15, and the position signal of the air mix door 15 detected by the potentiometer 37 is also input to the microcomputer 36 via the multiplexer 34 and the A/D converter 35. , the input signal
It is compared with the total signal E determined by Td to Tm, and a drive signal is sent to the air mix door drive circuit 69 to move the actuator 15.

The blower control unit 38 includes a power transistor 39
and a high-speed rotation relay RY _1. When the automatic switch 24a of the fan switch 24 is closed, the overall signal E sent from the microcomputer 36 is converted into a current value via the D/A converter 40. The amplification factor of the power transistor 39 is adjusted to automatically control the rotation of the blower 5. Further, when the high speed switch 24b of the fan switch 24 is closed, the coil 41 of the relay RY ₁ is excited via the buffer 43, the contact 43 of the relay RY ₁ is closed, and the current from the battery 22 is transferred to the power transistor 39. The rotation of the blower 5 is fixed at a high speed. In addition, fan switch 24
When the low speed switch 24c or the hot water switch 26 is closed, the contact 42 of the relay _RY1 is opened, and the amplification factor of the power transistor 39 is limited to a constant value, thereby fixing the rotation of the blower 5 at a low speed.

The compressor control section 44 has a defrost switch 45, and the comparison level for opening and closing the defrost switch 45 is determined by the overall signal E outputted from the microcomputer 36 via the buffer 43, When the temperature of the refrigerant becomes higher than the comparison level, the coil 46 of the relay RY ₂ is energized, the contact 47 of the relay RY ₂ is closed, and the electromagnetic clutch 12 is energized to drive the compressor 8 and vice versa. When the level is lower than the comparison level, driving of the compressor 8 is stopped.

In FIG. 3, the microcomputer 3
The operating characteristics of the blower 5, air mix door 13, and thermoswitch 45 with respect to the comprehensive signal E calculated in _{step 6 are} shown. The higher the speed is, the closer the constant value _E1.E7 is to the reference value K, the lower the speed is, and the lowest speed is in the range _E3 to _E5 , which _is closer to the reference value K. Furthermore, the air mix door 13 is fixed at the full heat position when the overall signal E is below a certain value _E2 , and gradually moves to the full cool side from the certain value _E2 until it exceeds the reference value K and reaches a certain value _E4 . Changes, and is fixed at the full cool position at a certain value E ₄ or higher. Furthermore, the comparison level of the thermoswitch 45 is fixed on the high temperature side when the comprehensive signal E is below the reference value K, and shifts to the low temperature side as it exceeds the reference value K.
It is fixed on the low temperature side at a certain value E ₆ or higher.

The above configuration is almost the same as a conventionally known one, and one of the features of this invention is that it detects the opening and closing of a car door. That is, in this embodiment, a room lamp circuit is used in which a room lamp 48 and a door opening/closing switch 49 are connected in series to a battery 22 via an ignition key switch 23. When the door opening/closing switch 49 turns ON/OFF, the buffer 5
A door opening/closing signal is inputted to the microcomputer 36 via 0.

Then, the microcomputer 36 uses a comprehensive signal E to use the first arithmetic expression f(Ea) when the door is closed, and to use the second arithmetic expression f(Eb) when the door is open.
It is programmed to switch between calculations.

The first calculation formula f(Ea) is: f(Ea)=(Tr-K)+αa(Ta-K) +αm(Tm-β)+αd(Td-K) +αs(Ts-K)+K Second calculation formula f
(Eb) is expressed as f(Eb)=(Tr-K)+αb(Ta-K)+αm(Tm-β)+αd(Td-K)αs(Ts-K)+K.

However, αa, αm, αd, αs, αb, and β are constants, and αb>αa.

Therefore, the second calculation formula f(Eb) is
In comparison with the calculation formula f(Ea), the influence of the input signal Ta of the outside air sensor 30 is large.

In the above configuration, an example of the operation will be explained based on the flowchart shown in FIG.
, it is determined whether the door is open or closed based on the signal input from the buffer 50. When the door is closed, the process advances to step 53, where the overall signal calculation f
(Ea) is performed to determine the overall signal E. Then, in steps 54 to 56, the air mix door 13, blower 5, and compressor 8 are controlled to have the operating characteristics shown in FIG.
Return to 52. On the other hand, if the door is open, the process proceeds to step 57, where the overall signal calculation f(Eb) is performed to determine the overall signal E, and thereafter steps 54 to 54 are performed.
Proceed to step 56 and perform the same processing as when the door is closed.

When the door is opened in this way, the outside air sensor 30
Since the second arithmetic expression f(Eb) is used, which has a greater influence on Even in this case, the overall signal E increases to, for example, _E6 because the outside temperature is high. Therefore, the air mix door 13 is at the full cool position, the blower 5 is at low to medium speed rotation, and the comparison level of the thermo switch 45 is at the low temperature side.
It is possible to prevent the temperature inside the vehicle from rising rapidly due to the increased cooling capacity and the opening of the door.
Changes in the vehicle interior temperature are detected by the vehicle interior sensor 28, so after the door is opened, the overall signal E will eventually deviate from the reference value K, and similar control will be performed. This does not cause a delay in response.

In FIG. 5, another embodiment of this invention is shown. In the previous embodiment, the calculation of the total signal E is switched within the microcomputer 36, whereas in this embodiment, the operation is switched before the multiplexer 34. A short-circuit switch 58 is provided to short-circuit the in-vehicle sensor input line 59 and the outside air sensor input line 60 of the multiplexer 34. That is, the short-circuit switch 58 is configured to switch between connecting the in-vehicle sensor input line 59 to the in-vehicle sensor 28 or the outside air sensor 30 based on the output from the microcomputer 36.

An example of the operation of this embodiment will be explained based on FIG. 6. First, when the door is opened in step 62 while normal control using the first arithmetic expression f(Ea) is being performed in step 61. If the determination is made, the process proceeds to step 63, where the timer built into the microcomputer 36 is activated for a certain period of time (for example, 5
(on the order of seconds), and normal control continues for a certain period of time. Next, when the process in step 63 is completed, it is determined again in step 64 whether the door is opened or closed. If it is determined that the door is closed, the process returns to step 61, and if it is determined that the door remains open, the process proceeds to step 65. move on. In this step 65, the shorting switch 58 is switched to the outside air sensor 30 side by the output from the microcomputer 36, and the in-vehicle sensor input line 59 is shorted to the outside air sensor input line 60. Therefore, the overall signal E in the microcomputer 36 is
The calculation is performed using the following second calculation formula f(Eb').

f(Eb')=(Ta-K)+αa(Ta-K) +αm(Tm-β)+αd(Td-K) +αs(Ts-K)+K Therefore, as in the previous embodiment, the outside air sensor 3
The influence of the input signal Ta of 0 is large.

Next, in step 66, it is determined again whether the door is open or closed, and when it is determined that the door is closed, the process proceeds to step 67, where timer processing is performed, and the total signal E based on the second arithmetic expression f(Eb') is continued for about 5 seconds, for example. control is performed. And step 6
At step 8, the shorting switch 58 is switched so that the in-vehicle sensor 28 and the outside air sensor 30 become independent, and the process returns to normal control at step 61.

It goes without saying that the above embodiment may also include a timer processing step similar to this embodiment. Further, the above-mentioned automobile doors include a hatchback type rear opening/closing door.

As described above, according to this invention, when the car door is opened, the car air conditioner is controlled using the second calculation formula that increases the influence of the input signal from the outside air sensor. , changes in vehicle interior temperature can be reduced. Therefore, the occupant feels better when opening and closing the door of the automobile, and since there is no sudden change in temperature, the health of the occupant can be protected.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of this invention. Figure 1 is a schematic diagram of the entire automotive air conditioner, Figure 2 is a circuit diagram of the control device, and Figure 3 is the air mix door and blower for general signals. and a characteristic diagram showing the operating characteristics of the thermo switch, Fig. 4 is a flowchart for explaining the action, Fig. 5 is a circuit diagram showing the main part of another embodiment, and Fig. 6 is the same as above. FIG. 3 is a flowchart diagram for explaining the operation of the embodiment. 21...Control device main body, 28...In-vehicle sensor,
30... Outside air sensor, 36... Microcomputer, 49... Door opening/closing switch.

Claims (1)

[Scope of utility model registration request] Means for detecting opening and closing of a door of an automobile and switching the calculation of the overall signal so that a first calculation formula is used when the door is closed and a second calculation formula is used when the door is opened. A control device for an air conditioner for an automobile, wherein the second arithmetic expression has a greater effect on an input signal from an outside air sensor than the first arithmetic expression.