JPS6216842B2 - - Google Patents

Description

[Detailed Description of the Invention] When the amount of solar radiation to the occupants increases, the present invention changes the amount of air blown out according to the pattern of the wind that changes in wind speed (hereinafter referred to as natural wind) that occurs in the natural world. The present invention relates to an air conditioner for a vehicle that does not impair a sense of coolness.

The inventors of the present application determined the opening/closing control amount of the air mix door based on the vehicle interior temperature Ti and the set temperature Ts, and changed the opening degree of the air mix door every unit time according to this control amount to adjust the vehicle interior temperature Ti. We are proposing a device that controls the temperature to match the set temperature Ts.

According to this device, when the air conditioning conditions of the vehicle interior, for example, the amount of solar radiation increases, the temperature of the vehicle interior increases due to the radiant heat.
Even if the temperature rises beyond the set temperature Ts, the increased cabin temperature Ti and the set temperature Ts are detected every unit time to determine the control amount for the air mix door, and the air mix door is driven by this control amount. The outlet air temperature is lowered so that the cabin temperature Ti matches the set temperature Ts.

By the way, in the above device, when the cabin temperature Ti is higher than the set temperature Ts, until the cabin temperature Ti decreases and becomes equal to the set temperature Ts,
In order to enhance the cooling sensation, air volume control has also been considered in which a blower is operated to increase the volume of air blown according to the temperature difference between Ti and Ts.

According to this air volume control, the air volume is increased in accordance with the temperature difference until the cabin temperature Ti matches the set temperature Ts, and when the temperature Ti matches the set temperature Ts, the air volume settles down to a predetermined preset air volume.

However, when the cabin temperature Ti matches the set temperature Ts, if sunlight shines into the cabin and hits the occupants, the sunlight may hit the parts of the vehicle that are exposed to sunlight, such as the face or arms. There is a problem that the cool feeling is lost due to the heat generated by the air.

The present invention has been made in view of the above, and in order to prevent passengers from losing a sense of coolness even when sunlight hits the passenger, when the luminous intensity of sunlight entering the passenger compartment exceeds a predetermined value, the amount of airflow of natural light is reduced. The air volume is changed according to the pattern.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a schematic diagram of an air conditioning unit used in the present invention. First, to explain the configuration, 1 is an intake door that switches between the outside air inlet 2 and the inside air inlet 3, 4 is a blower rotationally driven by a motor 4a, and 5 is an evaporator that cools and dehumidifies the air sent by the blower 4. , 6 is a heater core through which engine cooling water for reheating the cold air from the evaporator 5 is circulated. Further, 7 is an air mix door which determines the temperature of the blown air by changing the mixing ratio of cold air and warm air, and is designed to close the inlet to the heater core 6 during cooling, and open the inlet to the heater core 6 during heating. The air whose mixing ratio has been adjusted by the air mix door 7 is blown into the vehicle interior through a predetermined outlet via an outlet switching device (not shown).

On the other hand, as a drive system for the air mix door 7, a negative pressure actuator 8 is connected via links and rods, and this negative pressure actuator 8 is connected to an electric-pneumatic converter (hereinafter referred to as "electrical/pneumatic converter") 9. Using the air mix door control signal 10 as an input signal, the negative pressure actuator 8 is driven by turning on and off the negative pressure supply.

FIG. 2 is a block diagram showing an embodiment of a control device used to control the air conditioning unit shown in FIG. 1, and a microcomputer is used as the control unit. First, to explain the configuration, 21 is an IC regulator that generates a reference voltage for the power supply or sensor of each circuit section, 22 is a thermistor connected via a resistor 23, etc.
Indoor temperature sensor that detects, 24 is the set temperature
It is a temperature setting device using a potentiometer or the like to set Ts, and the vehicle interior temperature Ti detected by the indoor temperature sensor 22 and the set temperature Ts set by the temperature setting device 24 are input to the A/D converter 25. is converted into a digital signal. Further, 26 is an air conditioner operation switch, which commands to start and stop the air conditioner.

On the other hand, 27 serves as a computer section for controlling the air conditioning, and receives digital signals from the A/S converter 25 and ON/OFF signals from the air conditioner operation switch 26.
28 is an input interface circuit that inputs an off signal into the computer; 28 is an output interface circuit that outputs a control command calculated in the computer to an external circuit; and 29 is a central circuit that generates a predetermined air conditioning control command under program control. A processing unit (hereinafter referred to as "CPU"), 30 is a timer that generates a regular interrupt signal to the CPU 29, and 31 temporarily stores data detected for air conditioning control such as vehicle interior temperature Ti and set temperature Ts. RAM, 3
2 permanently stores the air conditioning control program.
It is a ROM. Furthermore, if the data shown in Figure 6a is obtained as a natural wind speed pattern, the ROM 32 creates a pattern in which the wind speed changes every unit time, as shown in Figure 6b, based on this data. The air volume pattern is fixedly stored in advance as constant data.

Further, as an operating system based on the control command signal from the computer unit outputted through the output interface circuit 28, 33 is an amplifier equipped with a transistor for amplifying and outputting the control command signal. The negative pressure side solenoid 34 and the atmospheric pressure side solenoid 35 of the electric/pneumatic converter 9 for driving the air mix door 7 shown are connected,
Furthermore, the motor 4a of the blower 4, which is rotationally driven under the control of the power transistor 37, is connected.
36 is a battery as a power source.

Furthermore, in order to detect the luminous intensity (intensity) of sunlight entering the vehicle interior, a solar radiation detection device 41 consisting of a solar radiation sensor 39 and an amplifier 40 is provided, and the detection signal detected by the solar radiation detection device 41 is A/S converted. The signal is converted into a digital signal by the device 25, and is temporarily stored in the RAM 31 of the computer section every unit time.

A concrete example of this solar radiation detection device 41 is shown in FIGS. 3 and 4.

The solar radiation detection device shown in FIG.
An electrical signal corresponding to the intensity of the light incident on the base of the phototransistor 43 is obtained, which is amplified by the transistor 44, and an operational amplifier 45 that operates as a voltage follower.
is output as a voltage signal by A/D converter 2.
5, it is converted into a digital signal.

The solar radiation detection device shown in Fig. 4 uses a thermistor 46 as a solar radiation sensor.Similarly, it is installed in an in-store panel, etc., and detects the change in the resistance value of the thermistor 46 due to radiant heat when exposed to sunlight. The luminous intensity of the light is detected, and the operational amplifier 45 outputs a voltage signal corresponding to the change in resistance value as a voltage signal. Note that the thermistor 46 as a solar radiation sensor is desirably black in order to easily absorb radiant heat.

Next, air conditioning control according to the present invention will be explained with reference to the flowchart shown in FIG. Note that the flow of air volume control and the control flow for making the vehicle interior temperature Ti match the set temperature Ts shown in FIG. 5 are stored in advance as a program in the ROM 32 of the computer section.

First, the timer 30 uses 2 CPUs every unit time.
In response to this scheduled interrupt, the CPU 29 determines the control amount of the air mix door 7 based on the cabin temperature Ti and the set temperature Ts, and outputs the control amount to the amplifier 33 via the output interface circuit 28.
By driving the air mix door, Ti and Ts
The negative pressure side solenoid 34 or the atmospheric pressure side solenoid 35 is turned on, and the air mix door 7 is opened and closed by the negative pressure actuator 8 so that the direction in which a blowout air volume matching the amount of air is obtained is obtained.

On the other hand, following the above-mentioned air conditioning control by the scheduled interrupt, the air volume control program shown in FIG. It is compared with a predetermined value, and if it is less than the predetermined value, the process proceeds to block 49 and outputs a motor control command to achieve a predetermined air volume, for example, the air volume selected by the air conditioner operation switch 26. The rotation of 4a does not change, and the amount of air blown also does not change.

However, when it is determined in the determination block 47 that the luminous intensity of the sunlight detected exceeds a predetermined value, the process proceeds to block 48, where an air volume change command is issued based on the air volume pattern shown in FIG. 6b. The power transistor 3 is output via the output interface circuit 28 and the amplifier 33.
By controlling 7, the blower 4 will increase over time.
By changing the rotational speed of the drive motor 4a, a change in air volume close to that of natural air is reproduced in the vehicle interior, so that the cool feeling is not impaired even in the presence of sunlight.

Note that the air volume control in the above embodiment is based on the vehicle interior temperature Ti and the set temperature Ts proposed by the inventors of the present application.
The present invention has been described as an example of a device that detects Ti and Ts every unit time and controls an air mix door so that Ti and Ts match. However, the present invention is not limited to this; Similarly to the above embodiment, when the luminous intensity of sunlight exceeds a predetermined value, the air conditioner uses a control method that controls the air mix door to balance the bridge composed of sensors, temperature setting devices, etc. The blowout air volume can be changed according to the air volume pattern.

As explained above, according to the present invention, the configuration is such that the luminous intensity of sunlight entering the passenger compartment is detected, and when this detected value exceeds a predetermined value, the blowout air volume is adjusted to the natural wind flow pattern. Therefore, even if parts of the human body, such as arms or face, become locally warmed by radiant heat due to exposure to sunlight, even if the cabin temperature is balanced with the set temperature, At this time, the flow of air inside the vehicle changes due to the change in air volume, which increases the heat dissipation effect and provides a cooling sensation, making it possible to provide comfortable air conditioning both during cooling and heating. Effects can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing an example of an air conditioning unit used in the present invention, Fig. 2 is a block diagram showing an example of a control device used in the present invention, and Fig. 3 is an example of a solar radiation detection device. FIG. 4 is a circuit diagram showing another embodiment of the solar radiation detection device, and FIG. 5 is a circuit diagram showing another embodiment of the solar radiation detection device.
The figure is a flowchart showing an example of the air volume control according to the present invention, and FIG. 6 is a graph diagram showing an example of the air volume pattern used in the air volume control of the present invention. DESCRIPTION OF SYMBOLS 1...Intake door, 2...Outside air inlet, 3...Inside air inlet, 4...Blower, 4a...Blower drive motor, 5...Evaporator, 6...Heater core, 7...Air mix door, 8...Negative pressure actuator, 9...
Electricity-air converter, 21...IC regulator, 2
2... Indoor temperature sensor, 24... Temperature setting device, 25
...A/D converter, 26...Air conditioner operation switch,
27...Input interface circuit, 28...Output interface circuit, 29...Central processing unit (CPU), 30...Timer, 31...RAM, 32...
ROM, 33, 40...Amplifier, 34...Negative pressure side solenoid, 35...Atmospheric pressure side solenoid, 36...Battery, 37...Power transistor, 39...Solar radiation sensor, 41...Solar radiation detection device, 42...Optical fiber, 43...Photo transistor, 4
4...transistor, 45...op-amp.

Claims (1)

[Claims] 1. It has a detection means for detecting the luminous intensity of sunlight entering the vehicle interior, and an air volume changing means that changes the blowout air volume according to the natural wind air volume pattern when the luminous intensity detected by the detection means exceeds a predetermined value. A vehicle air conditioner characterized by: