JPH078604B2 - Car air conditioner controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a car air conditioner control device including an inside / outside air introduction switching means and an air flow rate adjusting means.

[Conventional technology]

A car air conditioner control device provided with an inside / outside air introduction switching means and an air flow rate adjusting means is known, and is generally controlled independently by an operating instrument independent of the switching means and the adjusting means or an electric-mechanical actuator. To be done.

[Problems to be solved by the invention]

It is well known that when the switching means is switched from the outside air introduction state to the inside air introduction state, the air flow rate sharply increases due to the difference in ventilation resistance, and conversely, the air flow rate sharply decreases when switching from inside to outside. ing. As a result, there arises a problem that noise is generated when the passenger in the vehicle compartment switches the inside / outside air introduction switching means from the outside air introduction state to the inside air introduction state.

Therefore, in order to solve the above problem, the present invention provides a car air conditioner control device capable of extremely reducing the magnitude of noise generated when switching the inside / outside air introduction switching means from the outside air introduction state to the inside air introduction state. The purpose is to

[Means for solving problems]

Therefore, in order to achieve the above object, the present invention provides an inside / outside air introduction switching means for switching between an inside air introduction state and an outside air introduction state, and a blower for sucking and blowing the inside air or the outside air selected by the inside / outside air introduction switching means. And a blower amount adjusting means for adjusting the blower amount from the blower, and by adjusting the blower amount adjusting means in a direction to increase the operation amount, the blower amount from the blower is increased. In the car air conditioner control device for controlling, when the inside / outside air introduction switching means is switched from the outside air introduction state to the inside air introduction state, at the same time as this switching, the operation amount of the air flow rate adjusting means is set to be larger than the operation amount before the switching. And a blower air amount control means for controlling the blower air amount adjusting means so that this operation amount gradually becomes the operation amount before the switching. The emissions control system has its gist.

[Action]

Ventilation resistance is reduced by switching the inside / outside air introduction switching means from the outside air introduction state to the inside air introduction state, but at this time, the air flow rate control means switches the outside air introduction state from the outside air introduction state to the inside air introduction state. Simultaneously with the operation, the air flow rate adjusting means is controlled so that the operation amount of the air flow rate adjusting means becomes smaller than the operation amount before the switching.

That is, when switching from the outside air introduction state to the inside air introduction state, the amount of blown air that is expected to increase due to the decrease in ventilation resistance should be reduced by the blower from the blower. Since the air volume is small, the increase is offset and the air volume is prevented from rapidly increasing. That is, the noise generated when the inside / outside air introduction switching unit switches from the outside air introduction state to the inside air introduction state becomes extremely small.

Further, the air flow rate control means reduces the operation amount of the air flow rate adjusting means and then controls the air flow rate adjusting means so that this operation amount becomes the operation amount before the switching. It becomes the same as the operation amount before the switching. That is, the amount of air blown from the blower is the same before and after the switching.

〔The invention's effect〕

As described above, in the case of the present invention, the noise generated when switching the inside / outside air introduction switching means from the outside air introduction state to the inside air introduction state becomes extremely small, so that the discomfort caused by the noise at the time of the above-mentioned changeover The inside / outside air introduction can be switched without giving the passenger to the passenger compartment.

Further, in the case of the present invention, since the amount of air blown from the blower before and after the inside / outside air introduction switching is performed is controlled to be equal, the passenger inside the vehicle feels uncomfortable due to the change in the amount of air blown due to the above switching. Air-conditioning control can be performed without this.

〔Example〕

FIG. 1 is an electrical connection diagram showing an embodiment in which the amount of blown air is adjusted. In the figure, reference numeral 10 is a car air conditioner duct, 11
Is a switching damper as an inside / outside air introduction switching means, 12 is a blower, and 13 is its electric motor. When the main switch 14 is turned on, the electric motor 13 is energized via the current control transistor 15 or the resistor 16.

When the transistor 15 is completely off, the motor current flows through the resistor 16 at which time the blower blow rate is minimal and "slow". Transistor
When 15 is current-controlled by the speed control circuit (air flow rate adjusting means) 17, the motor current also changes accordingly, and the air flow rate changes.

The control circuit 18 as the air flow rate control means includes a transistor 15
Is configured to bypass the bias current of (1), and the amount of bypass is changed to change the motor current, thereby changing the amount of blown air.

Reference numeral 19 is a command switch which is interlocked with the switching damper 11 and is turned on when the damper 11 is in the inside air introduction state. In addition, damper 11
May be manually operated or actuated by an electro-mechanical actuator. When the command switch 19 is turned on, the timer circuit 20 closes its contact, and the electric charge of the capacitor 21 charged up to that point is instantaneously discharged via the resistor 22. Therefore, the transistor 23 is turned off and the transistor 24 is turned on. Then, the bias current of the transistor 15 is cut off and turned off. This causes the motor current to flow only through the resistor 16 and causes the blower 12 to operate "low speed".

The contact of the timer 20 is turned off after a set time of about 10 seconds has elapsed. As a result, the capacitor 21 is gradually charged via the resistor 25. Along with this, the bias of the transistor 23 gradually increases, and the load current of the transistor 23 increases accordingly. Furthermore, this allows the transistor 24 to absorb the bias current in the transistor 23, whereby the transistor 15 gradually increases the motor current and finally determines the value of the motor current according to the bias current from the speed control circuit 17. .

Briefly explaining the operation of this device, in the steady state, the blower 12 operates according to the signal of the speed control circuit 17, and if the switching damper 11 is switched from the outside air introduction state to the inside air introduction state, the transistor 15 is activated at that moment. Off and blower 12
Is forced to operate at "slow". Then, after a lapse of a predetermined time, the transistor 15 gradually starts to be turned on, the motor current is increased, and the air flow rate in the steady state is restored.

[Brief description of drawings]

FIG. 1 is an electrical connection diagram showing an embodiment of the present invention. 11 …… Switching damper (inside / outside air introduction switching means), 12 …… Blower, 13 …… Motor, 15 …… Current control transistor, 16 ……
Resistance, 17 ... Speed control circuit (air flow rate adjusting means), 18 ... Control circuit (air flow rate controlling means), 19 ... Command switch.

Claims (1)

[Claims] 1. An inside / outside air introduction switching means for switching between an inside air introduction state and an outside air introduction state, a blower for sucking and blowing inside air or outside air selected by switching of the inside / outside air introduction switching means, and a blower from this blower. A car air conditioner control device for controlling the air flow rate from the blower to increase the air flow rate by adjusting the air flow rate adjusting means to increase the operation amount of the air flow rate adjusting means. When the inside / outside air introduction switching means is switched from the outside air introduction state to the inside air introduction state, at the same time as this switching, the operation amount of the air flow rate adjusting means is made smaller than the operation amount before the switching, and then this operation amount is changed. A car air conditioner control device, comprising: an air flow rate control means for controlling the air flow rate adjusting means so that the operation amount before the switching is gradually obtained.