JPS6061320A - Automatic air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To make a comfortable air-conditioning control state securable from the outset of control, by installing a device which calculates a blowoff air quantity on the basis of each output of an operation circuit for a heat load value commensurate to outside temperature and another operation circuit for a room temperature differential for the desired value. CONSTITUTION:Each output of a temperature setting part 28, an outside temperature sensor 24 and a sunbeam sensor 25 is fed to an indoor desired temperature operation circuit 31, while the desired value of car room inside temperature is calculated at a circuit 31, and output of the circuit 31 is fed to a blowoff desired temperature operation circuit 32 togehter with output of a room temperature sensor 23 whereby the desired temperature of blowoff air is calculated at the circuit 32. Likewise, output of the circuit 31 is fed to a door desired opening operation circuit 33 together with output of a blowoff temperature sensor 26, calculating the opening of a cooling and heating air mixed door 10. Output of an outside temperature heat load operation circuit 37 and each output of a car heat load operation circuit 35 and a room temperature differential operation circuit 36 are all fed to an air quantity operation circuit 38, calculating the setting air quantity of a blower 5 via an air quantity control amplifier 21. With this constitution, the desired room temperature of a car is always maintainable.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic air conditioning system for a vehicle, and more particularly to an automatic air conditioning system for a vehicle that controls air conditioning in a vehicle interior by making full use of a microcomputer.

Traditionally, vehicle air conditioning control has been fully automated using microcomputers, including an outside temperature sensor that detects the temperature outside the vehicle, a room temperature sensor that detects the temperature inside the vehicle, and a solar radiation sensor that detects the amount of sunlight entering the vehicle interior. Input data is obtained using the outputs of sensors and the like as air conditioning control elements, and based on this input data, calculations are executed according to a control program of a microcomputer to control the air conditioning system.

By the way, in conventional vehicle air conditioning control, for example, if a passenger tries to start air conditioning control after entering the vehicle interior, at the start, the program is executed to adjust the motor voltage of the blower that blows the air to the outside air temperature. I keep it at maximum no matter what. In other words, when the air conditioning control starts, the volume of the blowing air is extremely high, and even in climate conditions where there is almost no difference between the outside temperature and the inside temperature, the floor will not be covered from the start of the air conditioning control. It is operated in strong winds and high noise conditions.

Such a situation is generally not desirable.1For example, unless the outside temperature is extremely high and the occupants want to be exposed to strong winds, they do not want a sudden change in their sensation.
In addition, it is desired that the interior of the vehicle be maintained in a natural state.

This invention was made by focusing on such conventional problems, and calculates the amount of heat load as appropriate for the amount of air blown into the vehicle interior according to the outside temperature condition, and calculates the heat load based on this. An object of the present invention is to provide an automatic air conditioning control device for a vehicle that can always set a comfortable air conditioning control state from the start of air conditioning control by providing means for calculating the maximum amount of air blown out. In order to achieve this object, the present invention provides various outputs of an outside temperature sensor and a solar radiation sensor that are provided at predetermined locations on the vehicle body to detect the temperature outside the vehicle, and a solar radiation sensor that detects the amount of incident solar radiation, as well as a sensor that sets the room temperature to a desired temperature. By inputting the outputs of the temperature setting parts that obtain the signals as the vehicle interior temperature determining elements, an interior target temperature calculation circuit that calculates the target value of the vehicle interior temperature, and each output of this interior target temperature calculation circuit and the outside temperature sensor are input. The external temperature heat load calculation circuit calculates the heat load adjustment according to the outside air condition based on the received temperature, the output of the indoor target temperature calculation circuit, and the output of the room temperature sensor that detects the temperature inside the car.
an indoor temperature difference calculation circuit that calculates the difference in the vehicle interior temperature at the respective points in time to be input into the target value of the vehicle interior temperature;
The configuration includes an air volume calculation circuit which inputs the output of the indoor temperature difference calculation circuit and calculates the settings of the air to be blown into the vehicle interior.

The present invention will be explained below based on the drawings.

FIG. 1 shows an embodiment of a normal automatic air conditioner to which the present invention is applied, and in the figure, reference numeral 1 denotes a ventilation duct that constitutes a vehicle interior air conditioning system.
-1 is provided with an inside air inlet 2 facing into the vehicle interior and an outside air inlet 3 facing, for example, the cowl top. These inlets 2 and 3 can be opened and closed by an inside/outside air switching door 4, and the introduced air is blown toward an evaporator 6, which constitutes a cooling unit, by a blower 5, which constitutes a blower unit. . Further, a heater core 7 constituting a heater unit is provided on the downstream side of the evaporator 6, and the cold air obtained downstream of the evaporator 6 is divided into the heater core 7 side and the bypass air path 8 side, so that it can be used in the mix chamber 9. A cold/hot air mixing door 1° for mixing cold air and warm air is adjacent to the heater core 7. The mix chamber 9 communicates with the interior of the vehicle, and the communication section includes a differential door 11 facing the tefrosta, a vent door 12 facing the instrument, and a floor door 13 facing the floor. I'm here.

The blower 5 is driven by a blower motor 14, and the evaporator 6 is operated by a compressor 15, a condenser J6, and an expansion valve 17.
The heater core 7 utilizes the cooling water of the engine 18, and when the water cock 19 is opened, hot water is circulated.

Next, the inside/outside air switching door 4 can be opened and closed by a switching door actuator 20 of a negative pressure drive type, for example, the blower motor 14 is controlled by an air volume control amplifier 21, and the cold/hot air mixing door 10 is driven by a negative pressure drive, for example. The opening degree can be freely adjusted by the type of door opening adjustment actuator 22.

On the other hand, a room temperature sensor 23 for detecting the temperature inside the vehicle is mounted on the ceiling of the vehicle interior, and an outside temperature sensor 24 for detecting the temperature of outside air is mounted outside the vehicle body, for example on the front bumper.
It has been investigated. In addition, a solar radiation sensor 25 for detecting the amount of solar radiation entering the vehicle interior is installed in the cowl top grille, for example, and a blowout temperature sensor 25 is installed in the differential door 11, vent door 12, and floor door 13 to detect the temperature of the blowing air. The sensor 26 is removed and 4=J is removed.

For convenience of explanation, Rakudoor 11. ．． One outlet temperature sensor provided in 12.13 is shown as a representative. In addition, the opening degree is checked near the cooling and heating temperature of 1-710,
A cold/hot air mixing door opening sensor 27 is provided. Since each sensor 23, 24, 25, 26.27 generally has an analog output, this analog output is sent to the microcomputer 30 via the A-D converter 29.
It is now entered into Further, a room temperature setting section 28 is connected to the microcomputer (month), which generates a digital signal for setting the vehicle interior temperature to a desired value.

The aforementioned internal/external air switching door actuator 2o, air volume control amplifier 21, and door opening adjustment actuator 22 are controlled by a microcomputer 3° according to a predetermined air conditioning control program for arithmetic processing. . Figure 2 shows this microcomputer 3.
The outputs of the temperature setting section 28, the outside temperature sensor 24, and the solar radiation sensor 25 are supplied to an indoor target temperature calculation circuit 31, and this circuit 31 calculates the humidity inside the vehicle. The target value of is calculated.

Further, the output of the circuit 31 is supplied together with the output of the room temperature sensor 23 to a blowout target temperature calculation circuit 32.
2, the target temperature of the blowing air is calculated. Further, the output of the indoor target temperature calculation circuit 31 is supplied together with the output of the outlet temperature sensor 26 to a door target opening degree calculation circuit 33, and in this circuit 33, the opening degree of the cool/hot air mixing door 10 is calculated.

Then, in this circuit 31, a target value of the vehicle interior temperature is calculated. Further, the output of the circuit 31 is supplied to the outlet target temperature calculation circuit 32 together with the output of the room temperature sensor 23.
This circuit 32 calculates the target temperature and force of the outlet air. Further, the output of the indoor target temperature calculation circuit 31 is supplied to a target opening calculation circuit 33 together with the output of the outlet temperature sensor 26, and this circuit 33 calculates the opening degree of the cold/hot air mixing door 10. The output of this circuit 33 is supplied to the door opening adjustment actuator 22 via a drive circuit 34.

Note that the drive circuit 34 includes a cold/hot air mixing door opening sensor 27.
The target opening degree of the cold/hot air mixing door 10 and the actual door opening degree are compared and monitored so that the opening degree can always approach the target opening degree.

On the other hand, each output of the temperature setting unit 28, the outside temperature sensor 24, and the solar radiation sensor 25 is supplied to a vehicle thermal load calculation circuit 35, and this circuit 35 calculates the thermal load corresponding to the thermal state of the vehicle at the relevant time. It has become so. Also,
The output of the indoor target temperature calculation circuit 31 is supplied together with the output of the room temperature sensor 23 to the indoor temperature difference calculation circuit 36, and this circuit 36 calculates the difference between the indoor temperature at the relevant point in time and the target indoor temperature. Further, each output of the indoor target temperature calculation circuit 31 and the outside temperature sensor 24 is supplied to an outside temperature heat load calculation circuit 37, which is based on the difference in the outside temperature at the relevant time with respect to the target value of the inside temperature. Calculate the heat load according to the outside air condition. The output of this circuit 37 and the respective outputs of the vehicle heat load calculation circuit 35 and the indoor temperature difference calculation circuit 36 described above are supplied to an air volume calculation circuit 38. The set air volume of the blower 5 is calculated.

Next, the operation of the automatic air conditioner according to the present invention, in particular, the control of the volume of discharged air, will be explained with reference to the flowchart 1 shown in FIG. 3 and the graphs in FIGS. 4 and 5.

For example, when an air conditioning control switch (not shown) is turned on while driving a vehicle and the microcomputer 30 is powered on,
The air conditioning control program is calculated from step 40 to star 1.

Then, in step 41, the temperature setting section 28 inputs the set temperature Ts, and in the next step 42, the outside temperature 1a and the solar radiation RZc are read. Further, in step 43, the target room temperature T is determined based on the input data of the set temperature Ts, the outside temperature Ta, and the amount of solar radiation Zc.
An operation of so is performed. Further, in step 44, a calculation is performed to obtain the difference ΔT between the outside temperature Ta and the target room temperature Tso, while in the next step 45, the inside temperature T
r is read, and in the next step 46, a calculation is performed to obtain the difference Δ1 (==) between the vehicle interior temperature Tr and the target room temperature Tso.

Thus, in step 47, it is determined whether the difference ΔT obtained in step 44 is larger than the difference ΔT1 shown in FIG. And this judgment is 1. ! If the answer is YES, that is, when the outside temperature Ta is extremely low compared to the target room temperature Tso, such as during a severe cold season, and a rapid warm-up is required from the beginning of air conditioning, the procedure shown in step 48 is performed. The motor voltage VM is gradually lowered from the characteristically maximum value VMh+ to the minimum value VM Ill.
Let it change up to. On the other hand, if the result at step 47 is negative, the process moves to step 49 and the difference ΔT? shown in FIG. It is determined whether or not the difference between and ΔT1 is equal to the difference of 6 teeth obtained in step 44. If this result is affirmatively YES, that is, as in the normal winter, the outside temperature Ta and the target room temperature T
If the difference from so is not extremely large, as shown in step 50, the motor voltage VM of the blower 5 has a value VxM(13
The voltage is lowered from VM to reach the minimum value vMm. In other words, the maximum value of the motor voltage VM is at step 47.
lower than that in . Furthermore, the value vM11! (2) changes according to the difference ΔT.

The next steps can be explained in the same way sequentially, including determining whether the difference 6th is between 6th 3 and ΔT2 (step 51), and determining whether the difference 6th is between Δ14 and ΔT3. (step 52), and when the former judgment is YES, the process moves to step 53 and the motor voltage VM is changed from VMM:l to Vv.
When the latter judgment is affirmatively YES, the process proceeds to step 54, and when the latter judgment is negative, the process proceeds to step 55. Here, in step 54, the motor voltage VM is changed from vMMe to V M I
In step 55, the motor voltage VM is changed from VMM2 to vMm. In addition,
Step 53 is a case of 4M where there is almost no difference between the outside temperature Ta and the target room temperature Tso, step 54 is a case where a normal cooling condition is required, and step 55 is a case where normal cooling conditions are required.
In this case, there is a need for sudden cooling, such as under the scorching sun in midsummer.

On the other hand, since the motor voltage VM needs to be changed in response to changes in the vehicle interior temperature Tr, it is necessary to be able to respond in accordance with the characteristics shown in FIG. Therefore, first step 56
In this case, the temperature difference Δ obtained at each step is ΔL1
Determine whether it is greater than or not. This result is positive'/[
If it is ES, the process moves to step 57 and the motor voltage V
Set M to the maximum value Vvh. That is, in this case, the temperature inside the vehicle has risen abnormally by 1. In this case, if the judgment result in step 56 is negative, the process moves to step 58, and it is judged whether the difference Δt is between Δt2 and Δt1, and this result is 17
If the heel is constant S, the process moves to step 59 and the motor voltage VM is set to VMΦ. Note that this voltage VM■ changes depending on the magnitude of the difference Δ. The following steps can also be explained in the same way. That is, in step 60, the difference Δ is ΔL3 and ΔL
2, and if the result is YES, the motor voltage v~1 is set to VM3 as shown in step 61, while the result is negative N.
If it is O, the process moves to step 62 and the difference Δ is Δ
1 and ΔL3; it is determined whether or not there is a value between 1 and ΔL3.

If the result is affirmative YH5, the process moves to step 638 and the motor voltage v is changed to VvO, while if the result is negative, for example, when the temperature inside the vehicle is extremely low, Proceeding to step 64, the motor voltage VM is set to V control 2.

Note that the blowout temperature sensor 26 is provided in each of the differential 1 hair 11, the vent door 12, and the floor door 13, but regardless of the blowout mode, the vent mode in which the vent door 12 is opened, and the pipe in which the vent door 12 and the floor door 13 are opened are the same. The above-mentioned air conditioning control can be carried out even in the case of the level mode, the differential door, and the heater mode in which the floor door 13 is opened.

Further, although the above-described embodiments have been described with respect to a normal air conditioner, the present invention can also be applied to a so-called two-layer air conditioner as shown in FIG. This two-layer air conditioner has a partition wall 70 installed near the heater core 7 constituting the heater unit 1- to form an upper minx chamber 71 and a lower minx chamber 72, thereby separating the upper and lower parts of the vehicle interior. It is intended to separately control air conditioning. Note that another differential door 73 is provided near the partition wall 60, and this differential door 73 is interlocked with the opening/closing operation of the floor door 13. Further, a main cool/hot air mixing door 74 and a sub cool/hot air mixing door 75 are arranged in parallel near the heater core 7, and the sub door 75 opens after the main doors 1 to 774 are half-opened.

Further, a bypass door 76 is provided between the heater core 7 and the partition wall 70. The other configurations are the same as those of the above-mentioned embodiment, so the explanation thereof will be omitted.

As explained above, according to the present invention, the volume of air blown into the vehicle interior can be controlled according to the difference between the outside temperature and the target room temperature, that is, the outside temperature heat load. Even when the temperature is close to the target room temperature, there is no need to blow air at the maximum air volume from the start of air conditioning control, and comfortable air conditioning control can be ensured in a natural state from the beginning. At the same time, in such a case, the air blowing noise from the blower can be kept quiet, so it is possible to avoid causing unnecessary irritation to the occupants due to the noise. Conversely, if the outside temperature is abnormally higher than the target room temperature, for example, the maximum air volume can be ensured from the beginning when air conditioning control is started, so the air conditioning can gradually shift to a natural air conditioning state without causing discomfort to the occupants. .

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an automatic air conditioner according to the present invention, FIG. 2 is a block diagram illustrating one embodiment of a control circuit, and FIG.
The figure is a flowchart explaining an example of a control program for operating an air conditioning system, and FIG. 4 is a graph showing the characteristics of the blower motor voltage with respect to the difference between the outside temperature and the target room temperature.
FIG. 5 is a graph showing the characteristics of the floor motor voltage with respect to the difference between the vehicle interior temperature and the target room temperature, and FIG. 6 is a schematic diagram illustrating the two-layer flow room conditioning system. 23. Room temperature sensor, 24. Outside temperature sensor, 25.
- Solar radiation sensor, 28 - Temperature setting section. 31... Indoor target temperature calculation circuit, 35... Vehicle heat load calculation circuit, 36... Indoor temperature difference calculation circuit, 37... Outside temperature heat load calculation circuit, 38. Air volume calculation circuit. Figure 4 VM Δt=Tr-Ts0 Figure 6

Claims (1)

[Claims] Obtain the outputs of an outside temperature sensor that is attached to a predetermined location on the vehicle body to detect the temperature outside the vehicle, a solar radiation sensor that detects the amount of solar radiation entering the interior of the vehicle, and a signal for setting the room temperature to a desired temperature. an indoor target temperature calculation circuit that calculates a target value of the vehicle interior temperature by inputting the outputs of the temperature setting section as the vehicle interior temperature determining elements; A vehicle heat load calculation circuit that calculates a heat load determined according to the thermal state of the vehicle, and a difference in the vehicle interior temperature at the relevant time point with respect to the target value of the vehicle interior temperature based on the outputs of the indoor target temperature calculation circuit and the room temperature sensor. an indoor temperature difference calculation circuit that calculates the indoor temperature difference calculation circuit; and a heat load according to the outside air condition based on the difference at the point in time that receives each output of the indoor target temperature calculation circuit and the outside air temperature sensor and adjusts the inside temperature to the target value at the time. an outside temperature heat load calculation circuit for calculating, and an air volume calculation circuit for calculating a set air volume of the outlet air in response to each output of the outside temperature heat load calculation circuit, the indoor temperature difference calculation circuit, and the vehicle heat load calculation circuit; An automatic air conditioning system for vehicles characterized by: