JPH0311922B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a car air conditioner control system, particularly to the selection of internal and external air intake and the operation of a dehumidifying cooling system.

The selection of internal/external air intake should be made based on various conditions, but typical examples include switching to internal air to prevent harmful gases from entering from outside the vehicle, and switching to internal air to prevent the entry of high-humidity air inside the vehicle. An example of this is switching to the outside air side for scavenging. However, these two switching conditions sometimes become contradictory. Japanese Patent Publication No. 57-20165 discloses that when two contradictory conditions occur, one of them is selected according to a preset priority order. However, this method is not an essential solution when the air outside the vehicle is contaminated and the humidity inside the vehicle is high.

The present invention has been made in view of the above, and not only prevents contaminated air from entering the vehicle interior, but also automatically operates a dehumidifying cooling device when the interior of the vehicle becomes humid, or To provide a car air conditioner control device that can take measures against humidity by notifying the user of humidity.

In particular, an object of the present invention is to provide a car air conditioner control device that prevents a dehumidifying cooling device from operating inadvertently by respecting the driving mode desired by the occupant in achieving the above object.

For this reason, the present invention includes a gas sensor that generates an electric signal in response to pollution of the air outside the vehicle, and a humidity sensor that generates an electric signal in response to the temperature of the air inside the vehicle. In response, the inside/outside air switching device is activated, and when the outside air of the vehicle is contaminated and the humidity of the interior air is high, the passenger selects and commands the dehumidification cooling device between an automatic operation mode and a stop mode. It is characterized by determining the operating state of the switch, and operating the dehumidifying cooling device if it is in automatic operation mode, and operating a display device to indicate that if it is in stop mode.

The present invention will be described below with reference to embodiments shown in the accompanying drawings. In FIG. 1 showing the overall configuration of this device, the configuration of the air conditioning unit will be explained first. Reference numeral 1 is a ventilation duct placed at the front of the vehicle compartment 8, and the upstream side of the duct is an intake port 1a for the interior air. and an intake port 1b for outside air, and both air intakes are selectively opened and closed by an inside/outside air switching damper 2. 3 is an electric blower that generates an air flow toward the passenger compartment 8 within the ventilation duct 1. Reference numeral 4 denotes an evaporator as a cooling heat exchanger, which together with a compressor 5 driven by an on-vehicle engine and other parts (not shown) constitutes a known dehumidifying cooling device, and cools the air flow passing through the ventilation duct 1. Reference numeral 6 is a heating heat exchanger that circulates cooling water for the vehicle engine using a heater. Reference numeral 7 denotes an air mix damper for temperature adjustment, which adjusts the temperature of the air blown into the passenger compartment by changing the proportion of air cooled by the evaporator 4 and reheated by the heater 6.

Next, the air control system will be described. Reference numeral 9 indicates an internal air sensor that generates an analog electrical signal corresponding to the air temperature in the vehicle interior; 11 indicates a temperature setting device operated by the passenger to set the desired air temperature in the vehicle interior;
A humidity sensor 12 generates an electric signal corresponding to the humidity inside the vehicle interior, and a gas sensor 13 is disposed at the air intake port 1b outside the vehicle interior and generates an electric signal corresponding to the gas concentration.

The electrical signals generated by each of these sensors and temperature setters are converted into digital signals by an analog-to-digital converter 14 and input to a computer 15. The computer 15 is a digital computer called a microcopy computer, and this computer 15 executes arithmetic processing according to a control program preset in an internal memory. The control program generates output signals from the computer 15 to control the operations of the inside/outside air switching damper 2, the electric blower 3, the compressor 5, and the air mix damper 7 based on signals from each sensor, setting device, and a switch described later. generate. The configuration of the microcomputer itself is well known, so we will not discuss it in detail, but the central processing (CPU), program memory (ROM), temporary memory (RAM), timing circuit, input/output circuit, etc. are integrated into a single chip. This is what I did.

Reference numeral 17 denotes a compressor drive circuit, which controls energization to an electromagnetic clutch 18 that connects and disconnects the compressor 5 from an engine (not shown) in accordance with an output signal from the microcomputer 15. Reference numeral 19 denotes an operating device for the inside/outside air switching damper 2, which operates the inside/outside air switching damper 2 using an output signal from the microcomputer 15 without electrical-mechanical conversion. Reference numeral 20 denotes an actuating device for the air mix damper 7, which adjusts the position of the air mix damper 7 using an output signal from the microcomputer 15 without electro-mechanical conversion.

Reference numeral 21 is an operation switch operated by the passenger to select the operating mode of the dehumidifying cooling system. and can be commanded. Reference numeral 22 denotes an indicator lamp, which is placed at a suitable location in the vehicle interior, such as an instrument panel, and when lit, indicates that the air outside the vehicle is contaminated and the air inside the vehicle is high in humidity.

FIGS. 2 and 3 particularly show the portion according to the present invention of a series of control programs of the microcomputer 15 in the above configuration, and the operation of the air conditioning unit is controlled in accordance with this control program. When the main switch is turned on, the computer 15 is supplied with power from an on-vehicle battery (not shown) via a stabilized power supply circuit, and executes the input signal condition judgment process shown in FIG. 2 and then the output judgment process shown in FIG. 3.

In the condition determination process shown in FIG. 2, the computer 15 first operates the A-D converter 14 in a signal input step 101 and stores the obtained digital signal in a predetermined location in the RAM.

In the next judgment step 102, the stored output signal Vs of the gas sensor is compared with a predetermined set value Vg, and if Vg-Vs>0, a flag N is set (N=1) in step 103, If Vg-Vs>0, the flag N is reset in step 104 (N=
0) Do. Note that the flag refers to means for specifying a predetermined location in a temporary memory and storing a state by a value stored there. Here, when the flag N is 1, it indicates that the air outside the vehicle is contaminated, and when the flag N is 0, it indicates that the air is not contaminated.

Next, in step 105, the vehicle interior relative humidity Hs at which the window glass begins to fog is calculated as a function of the outside air temperature Ta obtained from the outside air sensor 10 using a predetermined calculation method. In the next judgment step 106, the vehicle interior relative humidity Hr obtained from the humidity sensor 12 is compared with the reference relative humidity Hs calculated above, and if Hr-Hs>0, a flag H is set in step 107 (F=1).
However, if Hr-Hs>0, the flag H is reset (N=0) in step 108. In this case, when the flag H is 1, it indicates that the humidity is so high that the window glass begins to fog up, and when the flag H is 0, it indicates that the humidity is not so high.

In the output determination process shown in FIG. 3, the microcomputer 15 determines the position of the inside/outside air switching damper 2, the activation/stopping of the dehumidifying cooling device, and the display based on the values of the flags N and H and the state of the operation switch 21. Determines whether the lamp is turned on or off and generates an output signal. First, in step 201, it is determined whether the air outside the vehicle is contaminated, and if so (N=1), an output signal is provided to the actuating device 19 to open the inside air intake port in step 202.

Furthermore, in step 203, it is determined whether the humidity inside the vehicle is high, and if so (H=1),
Furthermore, in step 204, the state of the operating switch is determined. If the operation mode of the operation switch is ON mode or automatic operation mode, an output signal is generated to turn off the display lamp 22 in step 208, and an output signal is generated to cause the drive circuit 17 to operate the dehumidifying cooling device in step 209. Grant.

If the operation switch is in the economy mode, an output signal is generated to turn on the display lamp 22 in step 210, and a signal to stop the dehumidifying cooling device is given to the drive circuit 17 in step 211.

Steps 204 and below and steps 208 to 211 are performed when the air outside the vehicle is contaminated and the humidity inside the vehicle is high.
The dehumidifying cooling device is operated when the operating mode of the dehumidifying cooling device commanded by the occupant is on mode as well as when it is in automatic operation mode,
On the other hand, when economy mode is commanded, it simply means that the indicator lamp is turned on. Thus, if in automatic mode, the dehumidifying cooling system can be activated as needed to prevent the windows from fogging up due to high humidity, and if in economy mode, the operation of the cooling system can be restricted. In accordance with the occupant's intention, the dehumidification/cooling device is not activated, but instead the display lamp 22 is used to indicate to the occupant that he or she should take some countermeasures. Therefore, if the occupant deems it necessary, he or she may set the operating switch to the on mode or automatic operation mode.
Then, when the on mode or automatic operation mode is commanded, the dehumidifying cooling device is activated and the indicator lamp 22 is turned off.

By the way, if it is determined in step 201 that the air outside the vehicle is not contaminated, it is further determined in step 205 whether the air inside the vehicle is high in humidity, and if the air in the vehicle is high in humidity, the system is activated in step 206. An output signal is given to the device 19 to open the outside air intake, and if the humidity is not high, in step 207, the internal and external air intake is determined by a commonly known internal and external air determination program, and output is output to the actuating device 19 accordingly. give a signal. In this way, when the air inside the vehicle is not contaminated and the humidity inside the vehicle is high, outside air intake is selected, and otherwise, inside air or outside air is selected as appropriate.

By the way, check whether the air outside the vehicle is polluted.
Or, if the humidity of the air inside the vehicle is not high, step 212 is processed. step 212
Then, the computer 15 generates an output signal to turn off the indicator lamp 22. Therefore, the indicator lamp 22 lights up to inform the driver that the air outside the vehicle is polluted and the humidity inside the vehicle is high is only when these conditions occur in the economy mode.
Further, step 213 is processed, where the computer 15 determines the operation of the dehumidifying cooling device as appropriate in response to the operating mode. For example, if the operation mode is ON mode, an output signal is given to the drive circuit 17 to activate the dehumidifying cooling device, if it is economy mode, an output signal is given to stop it, and if it is automatic operation mode, an output signal is given to the drive circuit 17 to activate the dehumidifying cooling device. The dehumidifying cooling device is activated according to the flag H shown and other appropriate heat load conditions.
Give an output signal to stop.

By processing the control program in this way, the position of the inside/outside air switching damper 2 and the activation/stopping of the dehumidifying cooling device are controlled according to the degree of contamination of the air outside the vehicle and the humidity of the air inside the vehicle, and further, as necessary. The indicator lamp 22 is turned on and off, and the air conditioner can be operated according to the passenger's will.

In addition, when implementing the present invention, the display lamp 22
Alternatively, a voice message generator or a simple buzzer may be used.

As described above, according to the present invention, the excellent effect of realizing air conditioning control that respects the driver's will is achieved.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention, and FIGS. 2 and 3 are microcomputer 1 in FIG.
5 is a flowchart showing the main part of the control program of No. 5. 1... Ventilation duct, 2... Inside/outside air intake damper (inside/outside air switching device), 4, 5... Evaporator and compressor that constitute the dehumidifying cooling device, 12... Humidity sensor, 13... Gas sensor, 15... Micro Computer (main part of electrical control unit), 2
1... Operation switch, 22... Display lamp (display device).

Claims (1)

[Scope of Claims] 1. An air conditioning unit equipped with a switching device that selects between outside air intake and inside air intake and a dehumidifying cooling device; a gas sensor that generates an electrical signal in response to contamination of air outside the vehicle; and air inside the vehicle. a humidity sensor that generates an electrical signal in response to the humidity of the air; an operating switch that selects and instructs automatic operation mode and stop mode of the dehumidifying cooling device; a display device for a passenger; and the gas sensor, the humidity sensor, and the operating switch. an electrical control unit having an input of the switching device, the dehumidifying cooling device, and a display device connected to the input, the electrical control unit controlling the switching device to introduce inside air in response to contamination of the air outside the vehicle. In response to high humidity inside the vehicle, the switching device is set to introduce outside air, and when the outside air of the vehicle is contaminated and the air inside the vehicle is high humidity, the switching device is set to introduce inside air; A car air conditioner control device configured to operate the dehumidifying cooling device when in the operating mode and to operate the display device when in the stop mode.