JPS6345363Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device that automatically controls air volume, etc. in an automobile air conditioner.

In general, automotive air conditioners include controls such as an intake switching device that determines the intake ratio of inside and outside air, a blower that determines the air volume, a compressor that determines the circulation of refrigerant in the cooling cycle, and an air mix door that determines the mixing ratio of cold air and hot air. It is known, for example, from JP-A-56-146416, that the number of revolutions of the blower, the on/off temperature of the compressor, and the opening degree of the air mix door are controlled based on the overall signal T. Here, the total signal T
is expressed as T=Tr+αTa+βTs−δTd+a (1), where Tr is the inside temperature detected by the inside temperature sensor, Ta is the outside temperature detected by the outside temperature sensor, and Ts is the amount of solar radiation detected by the solar radiation sensor. The corresponding temperature, Td is the set temperature set by the temperature setting device, a is the correction value adjusted by adjusting means consisting of a variable resistor, α, β, δ are the gains of each sensor or setting device, and the air volume Q FIG. 1 shows specific control characteristics for the total signal T, taking as an example.

In other words, this control characteristic means that the total signal T is the reference value.
It is designed to be symmetrical with respect to the time of To, but in particular, the detected value Tr of the vehicle interior temperature sensor
Depending on the mounting position and type of car, △T will deviate from the true inside temperature Trs, and if it is left unchanged, it will be the standard value.
To shifts to To′. Therefore, the adjustment means is adjusted to increase the correction value a by ΔT=Trs-Tr=To-To' (2) to obtain a comfortable air conditioning feeling and performance.

Regarding the control of the intake switching device, as shown in Japanese Patent Application Laid-Open No. 56-31809, the difference between the set temperature Td from the temperature setting device and the inside temperature Tr from the inside temperature sensor is determined, When this difference is less than a predetermined value and it is determined that the vehicle interior has been sufficiently cooled, the intake switching device is operated to introduce a portion of relatively cold outside air, thereby saving energy by utilizing the outside air. It is known.

However, when the difference between the set temperature Td and the vehicle interior temperature Tr is used for determination in this way, the intake switching is Since the output from the in-vehicle temperature sensor is directly taken in as the temperature signal for activation, the above difference deviates from the true value required (because the correction has not been made), and there is a drawback that accurate judgment cannot be made. .

Therefore, this invention eliminates the conventional drawback of using the output from the vehicle interior temperature sensor as it is when controlling control equipment using the difference between the vehicle interior temperature and the set temperature as a judgment value. It is an object of the present invention to provide a control device for an air conditioner for an automobile that can always accurately control control equipment under the same conditions even if the installation position or the type of automobile changes.

The gist of this invention is, as shown in FIG. Temperature sensor 2
The adjustment means 32 adjusts the difference between the vehicle interior temperature Tr from
determining means 70 for determining a determination value by correcting it with a value b corresponding to the adjustment amount of and comparing this determination value with a predetermined value;
and a control means 80 for controlling the operation of the control equipment according to the determination result of the determination means 70.

Therefore, the judgment value for controlling control devices such as the intake switching device and the blower is determined by the adjustment means 3.
Since the correction is made in accordance with the amount of adjustment in step 2, even if the detected value of the vehicle interior temperature sensor 27 deviates from the actual vehicle interior temperature, it is adjusted in accordance with the correction of the overall signal. Therefore, the above problem can be achieved. It is possible.

Examples of this invention will be described below with reference to the drawings.

An embodiment of this invention is shown in FIG. 3, in which an intake switching device 2 is provided at the most upstream side of an air conditioning duct 1 of an air conditioner for an automobile, and this intake switching device 2 connects an inside air inlet 3 and an outside air inlet. An intake door 5 is arranged at the part where the intake door 4 and the intake door 5 are separated.
The intake door 5 is operated by an actuator 6 to adjust the ratio of inside air to outside air taken into the air conditioning duct 1. In this example, recirculation mode (REC) takes in 100% inside air, refresh mode (FRE) takes in 100% outside air, or 30% outside air.
It is possible to switch to a mix mode (MIX) that incorporates 50% to 50%.

The blower 7 is for sucking air into the air conditioning duct 1 and blowing it to the downstream side, and an evaporator 8 and a heater core 9 are provided on the downstream side of the blower 7. Evaporator 8 is compressor 1
0, a condenser 11, a liquid tank 12, and an expansion valve 13 to form a cooling cycle.
This electromagnetic clutch 10a
Drive stop is controlled by intermittent operation. Further, the heater core 9 is configured so that the cooling water of the engine 14 circulates therethrough to heat the air. An air mix door 15 is provided in front of the heater core 9, and the air mix door 15 is operated by an actuator 16.
The ratio of the air sent to the heater core 9 and the air bypassed is adjusted according to the degree of opening of the heater core 9, and the respective airs are mixed later.

The rear end of the air conditioning duct 1 is divided into a defrost outlet 17, a vent outlet 18, and a heat outlet 19, which open into the vehicle interior 20, and mode doors 21 and 22 are provided in the separated parts. The mode doors 21 and 22 are operated by an actuator 23 so that the blowing mode can be switched to a vent mode, a bilevel mode, a heat mode, or a defrost mode.

The actuators 6, 16, 23, the blower 7 and the electromagnetic clutch 10a are controlled by commands from a control unit 24 via drive circuits 25a to 25e, respectively. and,
The control unit 24 receives the set temperature Td from the temperature setting device 26, the inside temperature Tr from the inside temperature sensor 27, and the outside temperature from the outside temperature sensor 28.
Ta, the temperature Ts corresponding to the amount of solar radiation from the solar radiation sensor 29, and the cooling water temperature from the temperature switch 30 provided in the cooling water circulation system of the engine 14.
Tw, the opening degree θ from the potentiometer 31 that detects the opening degree of the air mix door 15, and the adjustment amount from the adjustment means 32 made of, for example, a variable resistor are input, and these input signals are compared and processed,
Control signals are output to the drive circuits 25a to 25e, and the control unit 2
A specific example of No. 4 is shown in FIG.

In FIG. 4, the temperature setting device 26 and each sensor 27 to 29 constitute a series circuit with a resistor 33 to 36, respectively, and the voltages V ₁ to V ₄ generated at their respective connection points are combined and output to an operational amplifier 37. is applied to the inverting input terminal of The non-inverting input terminal of this operational amplifier 37 receives the voltage _V5 generated by the series circuit of the adjustment means 32 and the resistor 38, and the operational amplifier 37 outputs the total signal T expressed by the above equation (1).
An output signal V ₆ corresponding to is sent out.

Further, the control unit includes a multiplexer 39, an A/D converter 40, and a microcomputer 41, and the multiplexer 39 receives a command from the microcomputer 41 and outputs the voltage V 1 corresponding to the set temperature Td, and the voltage V ₁ corresponding to the set temperature Td. Vehicle interior temperature Tr
, _{a voltage V 5 corresponding} to the adjustment amount of the adjustment means 32, a voltage V ₆ corresponding to the total signal T, and a voltage corresponding to the opening degree θ,
The selected analog signal is sent to the A/D converter 40.
The signal is converted into a digital signal and input to the microcomputer 41. Further, an on/off signal corresponding to the cooling water temperature Tw is input to the microcomputer 41, and an example of the blower control and intake switching device control of the microcomputer 41 is shown in the fifth example.
6 and 6, respectively.

First, the blower control will be explained based on FIG. 5. The microcomputer 41 will:
Execution of the control starts from step 50, and each signal is input in the next step 51, and the next step is started.
Proceed to 52. In this step 52, it is determined whether the temperature switch 30 is on or off, and when it is on at a low temperature, the heater core 9 has almost no heating capacity immediately after heating has started, so the process proceeds to step 54 and the air volume Q is set to the lowest "Low". ”. on the other hand,
If it is determined in step 52 that the temperature switch 30 is off, the process proceeds to step 53. In this step 53, the judgment value Td-Tr+b(b
is the value obtained from the _V5 voltage (equivalent to the correction amount of the total signal), and compares the judgment value with a predetermined value. If the judgment value is "B", which has increased to 12 degrees Celsius or more, for example, Since the heating capacity of the heater core 9 is still not sufficient, the process proceeds to step 56 and the air volume Q is set to a medium level of "Med". On the other hand, if the judgment value is "A", which means that the temperature has dropped below 8 DEG C., the process proceeds to step 55, and the air volume Q is controlled according to the pattern shown in FIG. 1 set as a program.

Next, the control of the intake switching device will be explained based on FIG.
1 starts executing the control from step 60 in the same way as the blower control, inputs each signal in the next step 61, and proceeds to the next step 62. In this step 62, the judgment value Td-Tr+b (b is
Since Tr is lower than _Td at startup for heating control, Td-(Tr-b) = Td-Tr+b) is determined and the determination value is determined as positive. If the determined value is "B", which is 12 DEG C. or higher, the heating capacity of the heater core 9 is still insufficient, and the process proceeds to step 68 to set the mix mode. On the other hand, if the judgment value is "A", which has decreased to 8℃ or less, the step
Proceed to 63. In step 63, it is determined based on the total signal T whether or not the compressor 10 should be driven. Compressor 1
If it is not in the condition to drive 0, the above step
Since it is determined in step 62 that the heating capacity of the heater core 9 is sufficient, the process advances to step 69 to set the fresh mode. On the other hand, compressor 10
If you are in a state where you should drive the
Proceed to. In this step 64, the outside temperature
Compare Ta with a predetermined value, and if it is determined to be "A", which means that the temperature has dropped below 16 degrees Celsius, the step
Proceed to step 69 and set to fresh mode. on the other hand,
If it is determined as "B" that the outside air temperature has risen to, for example, 21° C. or higher, the process proceeds to the next step 65. In this step 65, the air mix door 15
The opening degree θ of is compared with a predetermined value, and this opening degree θ is, for example,
If the temperature rises to 10° or more and is judged as “B”,
Since it is a non-mix school and does not require that much cooling capacity, proceed to step 68 and set it to mix mode. On the other hand, if the opening degree θ is, for example
If it is judged as "A" where the temperature has decreased to 5 degrees or less, it is time for mask cooling, which requires a large cooling capacity, and the process proceeds to the next step 66. In this step 66, the judgment value Tr-Td-b (b is obtained from the _V5 voltage,
Since Tr is higher than Td at startup for cooling control, in order to make the judgment value positive again, −{Td−(Tr−
b)}=Tr-Td-b) and compare the judgment value with a predetermined value, and if the judgment value is determined to be "A" which has dropped to below 0℃, use relatively cold outside air. There is room to do this, so proceed to step 68 and set the mix mode. On the other hand, if the determination value is determined to be "B", which means that the determination value has increased to 3 DEG C. or higher, for example, the process advances to step 67 and the recirculation mode is set.

Therefore, in blower control, step 53
In the control of the intake switching device, the determination values in steps 62 and 66 are each corrected by the value b corresponding to the adjustment amount of the adjustment means 32, so that accurate control can be achieved. The operation of the microcomputer 41 constitutes the determination means 70 and control means 80 shown in FIG.

As described above, according to this invention, when the difference between the set temperature and the inside temperature of the car is used as a judgment value for controlling control equipment, the output from the inside temperature sensor is not used as is, but the overall signal is corrected. Since the correction is made with a value corresponding to the adjustment amount of the adjustment means, accurate control can be achieved, and even if the adjustment amount of the adjustment means changes due to changes in the type of car, etc., the correction can be made accordingly. Since the judgment value is corrected, all judgments can be made under the same conditions.

[Brief explanation of the drawing]

Fig. 1 is a characteristic diagram showing the characteristics of air volume with respect to the overall signal T, Fig. 2 is a block diagram of this invention, Fig. 3 is a block diagram showing an embodiment of this invention, and Fig. 4 is a control diagram used in the above. A circuit diagram of the unit, FIG. 5 is a flow chart showing the blower control by the microcomputer used in the above, and FIG. 6 is a flow chart showing the control of the intake switching device shown in the above. 2...Intake switching device, 7...Blower, 2
6...Temperature setting device, 27...In-vehicle temperature sensor, 3
2... Adjustment means, 70... Judgment means, 80... Control means.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A temperature setting device, a vehicle interior temperature sensor, an adjusting means, and an amount by which the adjustment means adjusts the difference between the set temperature from the temperature setting device and the vehicle interior temperature from the vehicle interior temperature sensor. The apparatus is characterized by comprising a determination means for correcting the determination value with a value corresponding to the determination value and comparing the determination value with a predetermined value, and a control means for controlling the operation of the control device according to the determination result of the determination means. Automotive air conditioning equipment. 2. The air conditioner for an automobile according to claim 1, wherein the control device is a blower. 3. The air conditioner for an automobile according to claim 1, wherein the control device is an intake switching device.