JPS6130409A - Automotive air conditioner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an air conditioner for an automobile, and more particularly to an operating unit brightness adjustment device for an air conditioner for an automobile suitable for improving visibility.

[Background of the invention]

Conventional automotive air conditioning equipment (hereinafter abbreviated as A/C) requires the selection of the intake port, which determines the intake of inside or outside air, the position of the air mix door, which changes the mixing ratio of cold air and hot air, and the compressor FF. change the point. Control of the variable thermostat, selection of the air outlet into the passenger compartment, and selection of the air volume have all been done mechanically using an air conditioning lever installed in the passenger compartment instrument panel. In addition, in recent years, the number of air conditioners (hereinafter referred to as auto A/C) that automatically control these and keep the passenger compartment at the desired temperature has gradually increased. from,
It is composed of a push button or a touch type SW, and the operation by the occupant is inputted to the control circuit as an electric signal. Auto A/(1, with such an operation part,
Unlike those that control each part mechanically, it is not possible to check the operating status of the A/C based on the lever position.
Generally, the operation section is internally illuminated or an LED or the like is provided near each switch to display the operating status of the A/C, and the set temperature and the like are also displayed on an LCD or the like. Also, in the display using these lights.

Normally, it works in conjunction with a vehicle's headlight switch to reduce the brightness when the headlights are turned on at night. Furthermore, some devices have a brightness adjustment mechanism for meters, and can be linked to adjust the brightness.

However, these things can adjust the brightness at night,
The brightness during the daytime is constant, and there is a difference in visibility depending on the presence or absence of solar radiation. In particular, when the solar radiation is strong, the display cannot be clearly seen.

[Purpose of the invention]

An object of the present invention is to provide an air conditioner for an automobile equipped with an A/C or auto A/C operation section that does not impair visibility even in the presence of sunlight.

[Summary of the invention]

The auto A/C is equipped with an outside air sensor, a solar radiation sensor, etc. that correct the control based on outside temperature and solar radiation when controlling the temperature inside the vehicle. The idea was to use this solar radiation sensor to correct the vehicle interior temperature and change the brightness of the panel depending on the presence or absence of solar radiation, or its intensity.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 1 to 7.

FIG. 2 shows a system configuration diagram of the auto A/C. Air introduced from outside or inside the vehicle through the inside/outside air switching door 1 (hereinafter referred to as the intake door) is passed through the blower 2.
The air is blown to the evaporator 3. Temperature control door 3
(hereinafter referred to as the A/M door), the air is separated into hot air that passes through the heater core 5 and is reheated, and cold air that bypasses it. The air is mixed after the heater core to reach an appropriate temperature, and the mode doors 6 and 7 separate the air into The air outlet is determined.

These doors are driven by an actuator 8 that uses engine negative pressure, and the engine negative pressure drives an air valve 9.
By turning it ON-OFF, it is controlled by the output of the control circuit 11. Signals from various sensors 12 (inside air, outside air, blowout, etc.) 1 solar radiation sensor 13, signals such as set temperature from the control panel 14, A/M door position (not shown), etc. are input to the control circuit. In addition to driving the air valve, the fan control amplifier 10 is controlled to change the blower air volume and maintain the inside of the vehicle at a set temperature.

Each switch on the control panel includes the vehicle's light switch 16, illumination control (hereinafter referred to as IL).
A lamp for internal illumination is incorporated, which is linked to 17 (referred to as L).

Next, the circuit configuration will be explained with reference to FIG. The output resistance value of each temperature sensor is converted into a voltage by pull-up resistors R1 to Rn in the control circuit. Solar radiation sensor 1
2 is output voltage Q by the solar radiation sensor amplifier 18.
It is amplified to □. Further, the brightness of the illumination lamp is detected by a duty detection section (details will be described later).

The above three types of analog voltages are connected to a multiplexer (hereinafter referred to as M
PX), the signal is added to an A/D converter (hereinafter referred to as A/D), A/D converted, and input to a microprocessor (hereinafter referred to as μcon). μ
Con is ROM.

So-called 1-chip μ with built-in RAM, clock, etc.
It's a con. In addition, the panels S w, S 1 to Sj are
The light Sw signal, which is the 0N10FF signal of the illumination lamp, is directly input to the μ-con. The above is the input system of the μ controller.

Next is the output system. The lamp with built-in panel SW is driven by amplifying the output of the μcon by output transistors Q□-Q. Driving of the various A/Vs shown in FIG. 2 is similarly performed by amplifying the output of the .mu.converter using output transistors T1 to T.

In addition, a fan control 10 (
A D/A converter (hereinafter referred to as D/A) is provided to generate an output signal to the F/C).

With the above configuration, the overall air conditioner function is as follows. By the driver operating the panel Sw, μ
A command is given to the controller, and based on the command, the μ controller calculates the signals from the temperature sensor and solar radiation sensor. Based on the calculation results, the μ controller determines the output signal to the panel lamp and A/V F/C, and outputs the aforementioned output transistors Q1 to Q m ,
By driving T1 to Ti and D/A, the entire air conditioner function is achieved. Since this function is not directly related to the purpose of the present invention, further explanation will be omitted.

The characteristics according to the present invention are shown in FIG.

The panel lamp emits light according to instructions from the μ controller, and is controlled by 0N10FF to adjust the brightness. When the night light Sw is turned on, the ON duty of the panel decreases and the lamp becomes dark. At this time, illumination control (hereinafter abbreviated as ILL) is generally used to adjust the brightness of the illumination lamp.
Depending on the ON duty of the panel lamp, the ON duty of the panel lamp is also changed to unify the overall brightness. At this time, the highest ON duty is DUTY 1. When Lie 1 to Sw are OFF (daytime), the ON duty of the panel lamp increases, and the brightness becomes sufficient for sunlight. At this time, the lowest ON duty is DUTY2. As the solar radiation becomes stronger, the ON duty is increased, and in this example, the ON duty is increased to 6.
At 60 kcal/nf-h, it becomes 100%.

Next, means for realizing the above characteristics will be explained with reference to FIGS. 3 and 4. The signals necessary to realize the characteristics shown in Fig. 5 are the light Sw signal indicating 0N10 FF of the light Sw (this is directly input to the μ controller), the ON duty signal of IL'L, and the solar radiation amount signal. It is.

First, the solar radiation amount signal Q1 is obtained by amplifying the output of the solar radiation sensor using a single solar radiation sensor amplifier, and has the characteristics shown in FIG.

Next, the ON duty signal of ILL is connected to the lighting lamp,
It is obtained by clipping the voltage at the connection point of ILL (point in Figure 1) with a clip circuit consisting of Zener diode z1o and resistor R1o, and averaging it with an OR filter (consisting of R11 and C10). . This will be explained with reference to FIG.

When the Zener voltage of the Zener diode z10 is Vz, the output of the clip circuit is clipped between 0 and Vz. In other words, it becomes a square wave having a magnitude of 0 to Vz. This average voltage is . If the time constant of the OR filter is selected to be sufficiently large, for example 100 times, with respect to this square wave synchronization, Q2 will be sufficiently smoothed by the OR filter and will become equal to this average voltage.

In other words This is the characteristic shown in FIG.

We will explain the software that realizes the characteristics shown in Figure 5 using the three types of signals obtained above, the light SW signal, the solar radiation signal QX (hereinafter referred to as Q1), and the ILL ON duty signal (hereinafter referred to as Q2). .

First, the ON duty of the panel lamp is controlled by changing a memory called Duty between 0 and 100. This is when the μ controller turns on the panel lamp D
Uty is referenced and the ON duty of the panel lamp is controlled from 0 to 100% according to the value of 0 to 100.

Next, FIG. 7 shows a flow for changing the duty using the three types of signals.

First, check whether the line Sw signal is ON. If the light SW signal is ON, it is nighttime, and the ON duty of ILL is checked. This is ILLD. Then, as the panel lamp duty: Duty, the maximum duty Duty is I.
Since the proportional distribution using jLD is used, Duty is obtained by multiplying Duty by ILLD, and this routine ends.

Furthermore, if the light Sw signal is OFF, Ql is normalized by Ω□+4+QIL in order to obtain the ratio of solar radiation (with respect to 0 to 660 kcal/al-h). This is expressed as 5UND. This 5UND has a solar radiation of 66
When it is 0 kcal/al-h or more, it becomes 1 or more, so a judgment process is added to clip it at 1 to keep it between 0 and 1. Duty is 10 (L Dut
Similarly, y2 is calculated by adding the proportional distribution of 5UND. Then this routine ends.

The characteristics shown in FIG. 5 are realized by the above software and hardware.

〔Effect of the invention〕

According to this embodiment, the brightness of the internally illuminated operation section and display section of the A/C is automatically controlled depending on the presence or absence of solar radiation or the strength of solar radiation, thereby preventing deterioration of visibility due to solar radiation. At the same time, even when there is no sunlight, it is possible to prevent the display from being too bright, which has the effect of improving visibility.

[Brief explanation of the drawing]

Figure 1 is a circuit configuration diagram of this embodiment, and Figure 2 is an auto A/
A system configuration diagram of C, FIGS. 3 to 6 are diagrams showing the characteristics of this embodiment and characteristics of various signals, and FIG. 7 is a diagram showing the flow of this embodiment. 1... Intake door, 2... Blower motor, 3...
... Evaporator, 4... A/'M door, 5... Heater core, 6.7... Modeded 1.10... Fan control, 11... Control circuit, 15... Control panel, 16...γ) Light Sw, 17...Illumination con soft 1's 70th 30th also L + mouth figure 5 Ki 60 (nightlight) (between the eyebrows) figure 9

Claims (1)

[Claims] 1. In an air conditioner for an automobile, which is equipped with an internally illuminated operation section or display section, a detector that detects the presence or absence of solar radiation, and a brightness adjustment device that adjusts the brightness of the operation section or display section, or both, the operation section Alternatively, an air conditioner for an automobile, characterized in that the brightness of the display part or both is controlled by a brightness adjustment device and also by an output from a solar radiation detector.