JPS63489Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle air conditioner, particularly to control of a blower.

In general, an ignition key switch in an automobile can be switched from an OFF position, where power is cut off to various control devices of the automobile, to an accessory position, an ON position, and an engine start position. When switched to the accessory position, voltage is supplied to the display, radio, etc. When switched to the on position, voltage is supplied to the engine's ignition coil, and when switched to the start position, the engine starter is energized. Some recent vehicle air conditioners are designed to drive a blower when the ignition key switch is switched to the accessory position. According to this, outside air can be introduced and blown onto the passenger side in the summer, etc., and a certain degree of cooling sensation can be obtained even when the compressor is stopped.

FIG. 1 shows a known circuit showing an example of the above-mentioned vehicle air conditioner. In the figure, 1 is an ignition key switch, which includes a movable contact 2 that is linked to the ignition key, and a movable contact 2 that is linked to the ignition key. Fixed contacts 3 provided at the positions where 2 stops, that is, the accessory position 3, the on position 4, and the start position 5.
It consists of a, 4a, and 5a. 6 is a blower rotation speed setting switch that constitutes a vehicle air conditioner; 7 is a blower that introduces inside and outside air and blows the introduced air toward the evaporator; 8 is excited by a cooler switch 9 to drive a compressor 10; It is an electromagnetic clutch that is driven. The blower rotation speed setting switch 6 has a movable contact 11 that can be switched by manual or automatic operation, a fixed contact 13 provided at the stop position of the contact 12 provided at the tip of the movable contact 11, that is, a low speed position, A fixed contact 14 provided at a medium speed position, a fixed contact 15 provided at a high speed position, a fixed contact piece 16 provided over a section corresponding to each of the contacts 13, 14, 15, and a movable contact 11. and a contact 17 that is provided and contacts the fixed contact piece 16. Contacts 3a and 4a of the ignition key switch 1 are connected to a fixed contact piece 16 via diodes 18 and 19, respectively. The fixed contact 13 is connected to one end of the blower 7 via a resistor 20 with a relatively large resistance value, the fixed contact 14 is connected to one end of the blower 7 via a resistor 21 with a small resistance value, and the fixed contact 15 is connected directly to one end of the blower 7 via a resistor 21 with a small resistance value. It is connected to one end of the blower 7. The movable contact 11 is grounded via a relay 22, and one end of the contact 23 controlled by the relay 22 is connected to the battery 24 together with the movable contact 2 of the ignition key switch, and the other end is connected to the cooler switch 9, It is grounded via the electromagnetic clutch 8. Further, the other end of the blower 7 is grounded.

In the above configuration, when the movable contact 11 of the blower rotation speed setting switch 6 is switched to the fixed contact 13 in the low speed position while the movable contact 2 of the ignition key switch 1 is in the accessory position 3 or the on position 4, the current is Since the current flows from the battery 24 through the ignition key switch 1, fixed contact 16, movable contact 11, fixed contact 13, resistor 20, and blower 7, the blower 7 is rotated at a low speed by the current flowing through the resistor 20. . Further, when the movable contact 11 is switched to the fixed contact 14 at the medium speed position, a current flows through the blower 7 through the resistor 21 and rotates at the medium speed, and the movable contact 11 is switched to the fixed contact 14 at the high speed position.
5, the blower 7 is rotated at high speed. Further, since current flows from the fixed contact piece 16 to the relay 22 via the movable contact 11, the contact 23 is turned on, and if the cooler switch 9 is on at this time, the electromagnetic clutch 8 is energized. Therefore, when the ignition key switch 2 is switched to the start position 5 and the engine is driven, the rotational force of the engine is transmitted to the compressor 10 via the electromagnetic clutch 8, and the compressor 10 is driven.

However, according to the vehicle air conditioner having such a configuration, the blower rotation speed setting switch 6
For example, the movable contact 11 is the fixed contact 1 at a high speed position.
If the movable contact 2 of the ignition key switch 1 is switched to the accessory position 3 while the ignition key switch 1 is switched to the 5 side, the blower 7 will rotate at high speed, and at this time the battery 24 will not be charged because the engine has not been started yet. Because of this, battery 2
This has the disadvantage that the power of 4 is consumed, which shortens its lifespan. Also, if ignition key switch 1 is in the accessory position, the blower switch is on even though the engine is not rotating, and the cooler switch is on, power will be applied to clutch 8, wasting power. was consumed.

Therefore, the purpose of the present invention is to ensure that the blower always operates at a low rotation speed when the blower rotation speed setting switch is switched to the state where the blower is driven when the ignition key switch is switched to the accessory position. This method eliminates the above-mentioned drawbacks, and will be explained in detail below using examples.

FIG. 2 is a circuit diagram showing an embodiment of the vehicle air conditioner according to the present invention, and the same parts as in FIG. 1 are denoted by the same reference numerals. In this case, the blower rotation speed setting switch 6 is provided with a movable contact 30 that interlocks with the movable contact 11, and the movable contact 31 of the movable contact 30 comes into contact with the movable contact 11 in an area corresponding to the contacts 13, 14, and 15. A fixed contact piece 32 is provided, and this fixed contact piece 32 is connected to the contact point 3a at the accessory position. Contacts 11 and 3 above
0 and are insulated from each other, and the movable contact 1
1 and the fixed contact piece 32 are also insulated. Further, the movable contact 30 is connected to the fixed contact 13 at the low speed position. According to the above configuration, if the movable contact 2 of the ignition key switch 1 is switched to the fixed contact 3a at the accessory position 3, the movable contact 11 is in any of the fixed contact positions 13, 14, and 15. Since the movable contact 30 also contacts the fixed contact piece 32, from the fixed contact 3a on the ignition key switch 1 side, the fixed contact piece 32, the movable contact 30, and the resistor 2
Since current flows to the blower 7 through 0, the blower 7
is always driven at low speed. This reduces power consumption by the blower 7, eliminates the inconvenience of being unable to start the engine due to discharge of the battery 24, and extends the life of the battery 24. Furthermore, when the key switch 1 is in the accessory position, the coil 22 is not energized, so the contact 23 is not turned on, and the electromagnetic clutch 8 is not energized either, thereby saving power.

FIG. 3 is a block diagram showing an embodiment of the vehicle air conditioner according to the present invention configured using a control device such as a microcomputer. The device 40 receives a signal corresponding to the set temperature TD from the temperature setting device 41 and an internal air sensor 42.
A signal corresponding to the vehicle interior temperature tr detected by
A signal corresponding to the outside air temperature ta detected by the outside air sensor 43 and a signal corresponding to the solar radiation temperature ts detected by the solar radiation sensor 44 are input, and this control device 40 receives the above-mentioned vehicle interior temperature tr, outside air temperature ta, and solar radiation temperature. Total signal T obtained by calculating ts
At the same time, the difference F between the set temperature TD and the total signal T is calculated, and based on the magnitude of this calculated value F, the air mix door drive circuit 46 that rotates the air mix door 45 is controlled, and the electromagnetic clutch 8 is controlled. The switching control circuit 47 for on/off control is controlled, and the rotation speed setting circuit 48 for setting the rotation speed of the blower 7 is controlled so that this calculated value F becomes 0, that is, the vehicle interior temperature tr becomes the set temperature TD. Control various devices so that they approach the target.

Further, a signal corresponding to the switching position of the ignition key switch 1 is inputted to the control device 40, and a signal corresponding to the switching position of the blower rotation speed setting switch 6 is also inputted. When the movable contact 2 of the ignition key switch 1 is in the accessory position 3, the control device 40 operates the rotation speed setting circuit regardless of whether the fixed contact 11 of the switch 1 is in any of the fixed contact positions 13, 14, 15, and 50. By controlling 48,
Operate the blower 7 at low speed. On the other hand, when the movable contact 2 is in the ON position 4 and the start position 5, the rotation speed of the blower 7 is set to low speed, medium speed, high speed, or auto according to the switching position of the movable contact 11. In addition, only when the cooler switch 9 is on, the switching control circuit 47 is controlled and the electromagnetic clutch 8 is turned on.
control on/off.

In this embodiment, a voltage detection circuit 49 is provided to detect the voltage of the battery 24, and based on a signal from the voltage detection circuit 49, the blower 7 is rotated when the voltage of the battery 24 is higher than a set level. . When the level is below the set level, the blower 7 is controlled not to rotate. This makes it possible to suppress a drop in voltage due to rotation of the blower 7.

The operation of the vehicle air conditioner having the above configuration will be explained using the flowcharts shown in FIGS. 4 to 6.

First, when the cooler switch 9 is on and the ignition key switch 1 is in the on position or the accessory position, the control device 40 detects this and starts operation. In other words, the vehicle interior temperature tr, the outside temperature
Calculate the total signal T by calculating ta and solar radiation temperature ts,
The difference F between this total signal T and the set temperature TD is calculated, and based on this value F, the opening degree θ of the air mix door 45 is set, the compressor is controlled on and off, and the rotational speed of the blower 7 is set. The compressor is controlled according to the flowchart shown in FIG. That is, it is determined whether the ignition key switch 1 is in the on position or not. If the ignition key switch 1 is not in the on position, it is the accessory position, so the switching circuit 47 is controlled to turn off the compressor, and if it is in the on position, the compressor is It is determined whether or not the is in the on mode, and if it is not in the on mode, the compressor is turned off, and if it is in the on mode, the compressor is turned on. In addition, the above blower 7
The control is performed according to the flowchart shown in FIG. That is, based on the signal from the voltage detection circuit 49, it is determined whether the voltage of the battery 24 is higher than or equal to the set level, and if it is lower than the set level, the blower 7 is activated.
Turn off the battery to extend the life of the battery. If it is above the set level, it is determined whether the ignition key switch 1 is in the on position or not. If it is not in the on position, it is in the accessory position, so the rotation speed of the blower 7 is determined according to the switching position of the blower rotation speed setting switch 6. Rotates at low speed regardless. If the ignition key switch is in the on position, a target value for the blower is determined from the calculated value F, and the blower is rotated at the target rotation speed. Note that when the blower rotation speed setting switch 6 is in the manual operation mode, the control device 40 controls the blower 7 according to the switching position of the blower rotation speed setting switch 6.
Set the rotation speed.

As explained above, according to the vehicle air conditioner according to the present invention, if the blower is set to the driving state when the ignition key switch is in the accessory position, the blower is always operated at a low rotation speed. Power consumption can be reduced and battery voltage drop can be suppressed.
Further, according to the present invention, since the blower is rotated at a low speed, the cooling sensation is not significantly impaired even in summer.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an example of a conventional vehicle air conditioner, FIG. 2 is a circuit diagram showing an embodiment of a vehicle air conditioner according to the present invention, and FIG. 3 is a circuit diagram showing an example of a vehicle air conditioner according to the present invention. Block diagrams showing other embodiments of the device, FIGS. 4 to 6, are flowcharts for explaining the operation of the vehicle air conditioner described in FIG. 3. 1...Ignition key switch, 6...Blower rotation speed setting switch, 7...Blower, 8...
Electromagnetic clutch, 9... Cooler switch, 24...
Battery, 40...control device, 49...voltage detection circuit.

Claims (1)

[Scope of utility model registration request] In an ignition key switch that can be switched between an OFF position, an accessory position that energizes the blower that constitutes the vehicle air conditioner, and an ON position that energizes the engine starter position and all components of the vehicle air conditioner, the key switch is A vehicle air conditioner comprising a control means that detects when the blower is switched to an accessory position, controls a blower rotation speed setting means to set the rotation speed of the blower, and sets the rotation speed of the blower to a low rotation speed. .