JPH0141524B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicle air conditioner.

(Prior Art) In recent years, so-called automatic air conditioners that constantly maintain the temperature inside a vehicle at an optimal temperature have been put into practical use. Such automatic air conditioners use a microcomputer or the like to detect the temperature at several locations inside and outside the vehicle, and constantly control the temperature to the optimum temperature all year round.

Incidentally, even in this type of vehicle air conditioner, each setting can of course be adjusted by manual operation. In other words, if the front window becomes foggy, you can use the mode switch to switch to the differential to remove the fog, or if you just want to warm your feet, you can switch to the heat. .

However, with this type of conventional
Since the mode changeover switch is a lock-on type, for example, if the button operation is incomplete, all the pushbuttons will return to their original state, making it impossible to know which mode they are currently in. There was a problem that if the air conditioner ran out, or in severe cases, the air conditioner would stop working.

(Objective of the Invention) In view of the above, the present invention aims to provide a vehicle air conditioner in which the air conditioner always operates in auto mode even if the switch operation for the most frequently used auto switch is incomplete. That is.

(Structure of the Invention) In order to achieve the above object, the present invention includes a mode changeover switch for selecting an air outlet, and an auto mode in which the air outlet is automatically switched by a control circuit including a computer. The air conditioner for a vehicle is characterized by having a function of operating the auto mode when all of the mode changeover switches are in an off state.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

First, the differences between this example and the original application will be explained. In this example, the configuration of the mode changeover switch 202 is similar to the configuration of the fan changeover switch 203 in the original application.

In other words, when the switches Lo, Mi, and Hi that set the fan air volume are all turned off, the fan changeover switch 203 automatically operates the fan auto regardless of whether the fan auto switch Au, which automatically adjusts the air volume, is on or off. It's becoming like this. Therefore,
In this example, the mode changeover switch 202 has a similar configuration. Note that there is no change in other configurations.

Note that FIG. 6 is a drawing attached for the purpose of simplifying the explanation. However, this is well known, and the main parts of this figure were disclosed in the drawings of the original application.

Next, it will be explained in detail. In Figure 1, 1
1 shows the overall configuration (mainly showing the circuit) of the vehicle air conditioner. This is divided into a control section 2 and an air conditioning section 3. First, the air conditioning section 3 will be explained. However, since this is a well-known circuit, it will be briefly explained here.

In the diagram, B is the battery installed in the vehicle (not shown), FU is the fuse, IS is the ignition switch operated by the ignition key, and HR allows the blower fan to operate only when the ignition switch is turned on. Shows the heater main relay for. Next, CL is the magnetic clutch that controls power transmission to the air conditioner compressor, BM is the blower fan that creates the air flow for air conditioning, FS is the water temperature switch, and AS is the outside air sensor. Further, CV indicates an air outlet switching device having six electromagnetic valves V1 to V6, CO indicates a compressor relay that controls the operation of the air conditioner compressor, and CF indicates the ignition switch IS. Compressor cut relay to release the compressor operation by turning off, PS is the pressure switch, W1 and W2 operate the blower fan at low level when the cooling water temperature is between 30 degrees and 50 degrees. Warm-up relay, MC switches to auto mode when
is a computer that controls each part, and NS is an internal air sensor that detects the temperature inside the vehicle.

The solenoid valves V2, V5, and V6 are dampers DN2 that open and close the air outlet via diaphragms VD2, VD5, and VD6, as shown in FIG. 6 (the circuit shown in FIG. 6 is a well-known circuit). ,DN5,
Each is connected to DN6. The solenoid valves V3 and V4 are connected to the servo diaphragm SD. This servo diaphragm SD is for mechanically moving the servo stroke RV, and this servo diaphragm SD is controlled by turning on and off the solenoid valves V3 and V4 to switch between vent, heat, bi-level, and cool. It is becoming possible to do this.

The servo stroke RV is connected to a slide J made of a conductor, and the conduction state of the conductor DH of the circuit 2d can be selected by moving the slide J.

Next, the switch section 2 will be explained. The switch section 2 consists of a main switch section 2a and a power servo 2b. The power servo 2b is provided with switching circuits 2e, 2d, and 2f. These circuits 2e, 2d, and 2f consist of a conductor piece DH (shown as a rectangle in the figure) and a slide piece J that slides while contacting the conductor piece DH. This slide piece J is connected to the servo diaphragm SD as shown in FIG. The servo diaphragm SD is controlled by solenoid valves V3 and V4 operated by the computer MC.

On the other hand, a first switch circuit 100 shown in FIG. 2 and a second switch circuit 200 shown in FIG. 3 are built in the main switch section 2a. In the first switch circuit 100 and the second switch circuit 200, the terminals 1 to 9 have the same number, indicating that they are connected to each other, and the terminals a-1,
Terminals b-1 to b-7, terminals e-1 and e-2, and terminals s-1 to s-6 are connectors a and s-6 shown in FIG.
It is connected to the same numbered terminals b, c, d, e, and s.

Next, the first switch circuit 100 and the second switch circuit 200 will be explained.

As shown in FIG. 2, the first switch circuit 100 is mainly composed of an AUTO switch 101, an inside/outside air changeover switch 102, a DEF switch 103, and a temperature setting circuit 104.

The AUTO switch 101 is a switch for setting whether or not to automatically control the temperature in the vehicle interior to the temperature set by the temperature setting circuit 104, and is composed of two circuits and two contact switches 101a and 101b.

The inside/outside air changeover switch 102 is a switch for switching between outside air introduction mode and inside air circulation mode.
It consists of one circuit and one contact switch 102a.

The DEF switch 103 is a switch that operates the cooler and blows out cold air from the defroster and side defroster to clear the fog when the front window becomes foggy.
It consists of contact switches 103a and 103b.

The temperature setting circuit 104 consists of a temperature display section 104a and a temperature setting section 104b. The temperature display section 104a has a digital display 104c made of a light emitting diode, a liquid crystal, etc. as shown in FIG. 4, and a temperature setting dial 104d. There is. This encoder is configured to output a code for directly lighting each segment of the digital display 104c,
By successively rotating the temperature setting dial 104d, the display on the digital display 104c can be changed to, for example,
It can be set to 15 to 30 in 0.5 increments.

The temperature setting section 104b is composed of a variable resistor, and the variable resistor 104b is connected to the encoder. That is, in this example, by turning the temperature setting dial 104d, the display on the digital display 104c changes, and the resistance value of the temperature setting section 104b changes in response to this change.

In addition, the first switch circuit 100 includes diodes D12, D20, D22, resistors R1, R
2, R3 and light emitting diode LED1, LED2,
It has 3 LEDs.

The second switch circuit 200 includes a lighting switch 201 (not shown) for instrument panel lighting, which is turned on and off by a relay RL as shown in FIG.
Switch 10 for changing heat mode
1,103, a mode changeover switch 202 consisting of VE, BL, and HE, a fan changeover switch 203 consisting of switches Hi, Mi, Lo, Au, and OF for changing the strength of the blower fan; The main components are a relay circuit 204 having relays AU, MI, and HI whose operation is controlled by a switch, a relay contact circuit 205 consisting of relay contacts AUa, MIa, and HIa of the relay circuit 204, and an air conditioner switch 206. It is becoming popular as

In this example, the AUTO switch 101 is an automatic reset type push switch, and when this switch 101 is turned on, the other switches VE, BL, 103, and HE are all automatically reset. . That is, by turning on the auto mode, switches 101, VE,
BL, 103, and HE are all turned off.

However, other switches VE, BL, 103,
The HE is configured as a type of switch in which when any one of these four switches is turned on, the other switches that were on until that time are automatically reset.

Also, the switches 101, 103, VE, BL, HE of the mode changeover switch 202, the switches Hi, Mi, Lo, Au, of the fan changeover switch 203,
OF and the air conditioner switch 206 are the switches VE, BL, and BL of the controller 300 shown in FIG.
HE, OF, Au, Lo, Mi, Hi, 101, 103
and 206. In addition, the second switch circuit 200 includes diodes D1 to D7, D1
0, D11, D13, D14, D15, D16,
It has a resistor R4 and a lamp LA2.

Note that the controller 300 shown in FIG. 4 is provided in an instrument panel or the like of a vehicle (not shown). And the switch indicating AUTO
Au is a switch for automatically adjusting the strength of the fan, and AUTO switch 101 is an auto mode switch for automatically changing the state of each part to maintain the set temperature.

Next, the action and effect will be explained. In the following explanation, a function that automatically shifts to the AUTO mode when all switches VE, BL, HE, 101, and 103 of the mode changeover switch 202 are turned off will be explained. The state of each part when part 3 is set arbitrarily will be explained, and then from this state mode changeover switch 2 will be explained.
02 switch VE, BL, HE, 101, 103
automatically set to AUTO when all are turned off.
This section describes the function that transitions to mode.

Note that the auto mode in the following description includes automatic adjustment of the temperature inside the vehicle interior and automatic adjustment of the air blowing position, but here, automatic adjustment of the air blowing position will be mainly explained.

First, it is assumed that the air conditioner is initially set in the following state. That is, the mode is
It is assumed that Bilevel is set, fan is set to auto, and inside/outside air is set to shy. The settings of each switch of the controller 300 in this state are as follows. That is, the DEF switch 103 is turned off, and the inside/outside air changeover switch 102 is turned off.
is on, but AUTO switch 101 is off. In addition, a mode changeover switch 202
Then the switch BL is turned on (so the mode is
Bilevel), air conditioner switch 206
is turned off, and the switch OF of the fan changeover switch 203 is pressed. (Therefore, the fan is set to auto.) Therefore, in the above setting state, the first
Switch circuit 100 and second switch circuit 200
Each switch in is set as shown by the solid line in the figure.

Note that the above setting state is hereinafter referred to as manual mode. Here, I would like to give a preliminary explanation about the difference in control between manual mode and auto mode. In auto mode, current is applied to the solenoid valve via the power servo 2b (more precisely, the conductor piece DH in the power servo 2b). The manual mode is a circuit configuration for allowing current to flow through the solenoid valve without passing through the power servo 2b (more precisely, the conductor piece DH within the power servo 2b). In the following explanation, the manual mode will first be explained.

Next, specific current paths and operating conditions will be explained.

First, the fan changeover switch 203
OF is turned on, but the switches Au, Lo,
Since Mi and Hi are all turned off, the blower fan BM operates in auto mode.

In other words, when switches Au, Lo, Mi, and Hi are all turned off, switches a,
b and c turn on and auto relay AU operates. Then, its normally open contact AUa turns on.

On the other hand, the normally open contact AUa communicates with the terminal s-3, and the terminal s-3 in FIG. 1 communicates with the terminal c-2 of the connector C via the warm-up relay W2. From this terminal c-2, terminals c-1, c-3, d-1, d Since this terminal is connected to either terminal 1, 3, 5, or 6 of the blower resistor BR, the blower motor BM is operated. (The other side of the normally open contact AUa is connected to the ground through the terminal s-1.) Thus, the blower fan BM operates in auto mode via the current circuit as described above.

Note that since the air conditioner switch 206 is turned off, the air conditioner (not shown) (automatic air conditioner) does not operate.

Next, to explain the operating paths of the solenoid valves V2, V5, and V6, one contact a of the switch BL in FIG. 3 is connected to the terminal b-5 in FIG. 1 via the terminal b-5.
Since it is connected to the terminal b-9 of the power servo 2b, it is connected to the diodes D1, D2 and the terminal D-
6, D-8 leads to solenoid valves V2 and V6. The other side of the same solenoid valves V2 and V6 is connected to the connector CN.
It communicates via terminal 6 of No. 1 to an ignition switch IS connected to the positive side of battery B.

On the other hand, the other contact b of the switch BL is connected to the terminal 4 in FIG. 2 via the terminal 4 in FIG.
It communicates with terminal 1 via contacts a and c of AUTO switch 101. This terminal 1 is terminal 1 in Figure 3.
Since the terminal 1 is connected to the terminal s-1,
through the terminal s-1 in FIG.
1 to earth E. Now, solenoid valve V2
The current path for operating V6 has been determined.

On the other hand, regarding the solenoid valve V5, the solenoid valve V5 is connected via the ignition switch IS, terminal 6 of the connector CN1, and terminal 2 of the combination valve CV.
5, and the other terminal is connected from terminal 1 of combination valve CV to terminal D-7 of connector d, connected to terminal d-3 via diode D3, and from terminal d-3 to terminal D-7 of connector d. It is connected to ground E via terminal b-7 of connector b and terminal a-2 of connector a.

In this way, when the switch BL of the mode changeover switch 202 is turned on through the current path described above, the solenoid valves V2, V5, and V6 are connected between the battery B and the earth E, and the solenoid valves V2, V5, V
6 is activated and the mode becomes Bilevel.

Next, a current path for operating the solenoid valve V7 for switching between inside and outside air will be explained. As mentioned above, terminal b-1 of connector b is connected to terminal 6 of connector CN1.
The positive side is connected to battery B via the ignition switch IS. On the other hand, terminal b-
1 is connected to one terminal of a solenoid valve V7 via a terminal RE2, and the other terminal of the solenoid valve V7 is connected to a second terminal via a terminal RE1 and a terminal 3, as shown in FIG.
It is connected to contact a of the inside/outside air changeover switch 102 shown in the figure. On the other hand, contact b of the changeover switch 102
is connected to terminal 1 through contacts a and c of DEF switch 103, and terminal 1 is connected to terminal s-1 in second switch circuit 200 in FIG. (This terminal s-1 is connected to the ground E shown in FIG. 1.) Therefore, by turning on the inside/outside air changeover switch 102, the solenoid valve V7 is connected between the battery B and the ground E. is activated. (In other words, it switches to indoor air.) Since the light emitting diode LED1 is connected to terminal b-1 via terminal 7 and resistor R4, it lights up when the indoor/outdoor air selection switch 102 is turned on. There is.

Next, the function of automatically operating the auto mode when all the switches of the mode changeover switch 202 are in the OFF state will be explained.

Here, to summarize the following explanation, the explanation here is that when all the mode changeover switches 202 are turned off, what route is taken to connect the power servo 2b (to be precise, the conductor piece DH) to the solenoid valve?
This is an explanation of how current is supplied through.

First, in the above usage condition, the mode is Bilevel,
The fan is set to auto and the inside/outside air is set to shy. And since the mode is Bilevel,
Drivers and others can keep both their feet and their bodies warm.

Next, it is assumed that the bilevel state provides enough warm air and the bilevel switch BL and heater switch HE are turned off. (In this state, switches 101, 103, VE, BL, HE
are all turned off. Therefore, the mode changeover switch 202 shown in FIG. 3 is set to the state shown by the solid line in the drawing. ) Then, the terminal s-1 of the connector S in FIG. 1, which is connected to the ground, passes from the terminal s-1 in FIG. 3 to the terminal 1, and from this terminal 1, the terminal 1 in FIG.
Terminal 1 leads to terminal 4 via switch 103a and switch 101a. And since this terminal 4 leads to terminal 4 in Fig. 3,
Switch HEa, Switch 103c, Switch
It communicates with terminal b-7 via BLa, switch VEa, and switch 101c. And this terminal b-
7 is connected to terminal b-7 in Fig. 1, and terminal b-7 is connected to terminal d-3, so current flows to the solenoid valve via the conductor piece DH of the power servo 2b. will be supplied. Therefore, this activates the auto mode.

Next, automatic mode control by the computer MC after the terminal b-7 is electrically connected to the ground will be explained. (In other words, we will explain how auto mode control is performed by connecting terminal b-7 to the ground and supplying current to the solenoid valve via the conductor piece DH of the power servo 2b.)However, Since this is a well-known control, it will be briefly explained here.

The aforementioned air outlet switching control is always performed no matter what state the mode changeover switch 202 is in. In other words, power servo 2
The movement of the slide piece J of b is always controlled by a servo diaphragm SD controlled by a computer MC.

However, in the manual mode, the current is supplied bypassing the power servo 2b (to be precise, the conductor piece DH and the slide piece J), so the computer MC controls the slide piece J using the servo diaphragm SD. However, the solenoid valve is fixed to the manually set state.

Then, when switching from manual mode to auto mode, power servo 2b (to be exact, conductor piece DH
Since current is supplied to the solenoid valve through the slide piece J) and the slide piece J), switching control of the air outlet is performed by the computer MC.

Next, each current path for each position of the slide piece J will be explained.

First, when the slide piece J is moved by the servo diaphragm SD to the left end of the power servo 2b in FIG. 1 (position indicated by J in the figure), the solenoid valve V2,
Since a current supply path to V5 and V6 is not established, all solenoid valves V2, V5 and V6 are turned off. Therefore, in this state, the mode becomes VENT as shown in FIG. 5 (in the figure, ◯ indicates on and x indicates off).

Next, when the slide piece J is moved by the servo diaphragm SD to the approximate center of the power servo 2b in FIG. 1 (the position indicated by J1 in the figure), the terminal d
-3 is connected to terminal b-7 via slide piece J, terminal d-6 and diode D via diode D2.
1 to terminal d-8, respectively. Therefore, the solenoid valves V2, V5, V6 connected to the terminals d-3, d-6, d-8 are turned on. Therefore, in this state, the mode becomes Bilevel as shown in FIG.

Next, when the slide piece J is moved to the right end of the power servo 2b in FIG. 1 (the position indicated by J2 in the figure) by the servo diaphragm SD, the terminal d-3
are connected to terminal d-6 via diode D2 and to terminal d-8 via diode D1, respectively. Therefore, both the solenoid valves V2 and V6 connected to the terminals d-6 and d-8 are turned on and V
5 is turned off. Therefore, in this state, the mode becomes HEAT as shown in FIG.

In this way, the air outlet is automatically switched and controlled by the slide piece J operated by the servo diaphragm SD.

As mentioned above, in this example, mode changeover switch 2
02 has the same configuration as the fan changeover switch 203,
That is, switches 101, 103, VE, BL,
When all HE is turned off, the auto mode is configured to activate automatically, so when no manual operation is performed, the auto mode automatically activates and the interior of the vehicle is always kept in the optimal air conditioning condition. It is. Therefore, the driver and the like need not pay much attention to the air conditioning, and can therefore concentrate even more on driving.

In this example, the explanation has mainly been given to the control of the air outlet, but it goes without saying that similar control can be performed for automatic adjustment of the temperature in the vehicle interior. Furthermore, if necessary, only the temperature may be controlled.

(Effects of the Invention) In other words, the present invention provides a vehicle air conditioner in which the air conditioner always operates in the auto mode even if the mode changeover switch is incompletely operated. It has the excellent feature of being able to provide

In addition, even if the mode changeover switch is not fully operated, at least an air-conditioned space in the auto mode is ensured, so it has a desirable feature that optimal livability is always ensured with good air conditioning.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an explanatory diagram mainly explaining the overall configuration of the air conditioner using a circuit diagram, FIG. 2 is a circuit diagram showing the first switch circuit, and FIG. Figure 3 is a circuit diagram showing the second switch circuit, Figure 4 is a plan view showing the controller, Figure 5 is an explanatory diagram showing the operating status of each part in each mode, and Figure 6 is a diagram showing the solenoid valve and power supply. FIG. 3 is an explanatory diagram mainly showing a servo and a servo diaphragm. J...Slide piece, DH...Conductor piece, MC...
Computer, BM... blower fan, CV...
Switching device, CL...Magnetic clutch, CO...
Compressor relay, CF...Compressor cut relay, 2a...Main switch section, 2b...Power servo, 103...DEF...Switch, 202
...Mode changeover switch, 203...Fan changeover switch.

Claims (1)

[Claims] 1. A push-button mode that selects four switching modes: a blower fan and air conditioner, a damper for switching the air intake to inside and outside air, and an air outlet consisting of vent, bi-level, heat, and differential. In a vehicle air conditioner equipped with a changeover switch and an auto mode in which the air outlet is automatically switched by a control circuit including a computer, the push-button mode changeover switch corresponds to each of the changeover modes. It consists of four switches,
Each switch has a normally open contact and a normally closed contact, and the normally closed contacts of the four switches are connected in series, and the normally open contact closes when the corresponding switch is turned on, and corresponds to the switch. A contact that activates a function, and the normally closed contact is:
An air conditioner for a vehicle, characterized in that when all of the switches are off, all of the normally closed contacts are conductive in series to supply an input for operating the auto mode.