JPH0312211A - Control system for on-vehicle air purifier - 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 the Invention The present invention relates to a control device for a vehicle air purifier installed in a vehicle interior.

2. Description of the Related Art A conventional control device for a vehicle-mounted air cleaner generally has a configuration shown in FIG. In FIG. 2, when a switch 2 connected in series to a battery 1 is closed, power is supplied to a control circuit 3, and an output signal from the control circuit 3 turns on a switching element 4 to energize a motor 5. Accordingly, the fan 6 is rotated to let air flow in, and particles such as cigarette smoke are adsorbed onto the filter 7 installed in front of the fan 6, thereby purifying the air inside the vehicle.

Problems to be Solved by the Invention However, in the conventional control device for a car air purifier, the motor 3 always rotates at full speed when the switch 2 is turned on. Since the exhaust air hits the head of the person sitting in the seat, there is a problem that the exhaust air cools the head even more, making the person feel extremely uncomfortable, especially when the temperature inside the vehicle is low, such as in winter. was.

The present invention solves the above-mentioned conventional problems, and aims to provide a control device for a vehicle air cleaner that weakens the exhaust air when the temperature inside the vehicle is low and does not cause discomfort to people in the rear seats. This is the purpose.

Means for Solving the Problems In order to solve the above problems, a control device for a vehicle air cleaner according to the present invention is a vehicle air cleaner that rotates a fan with a motor and cleans incoming air with a filter or the like. A plurality of drive semiconductors are provided to drive the motor with currents of different magnitudes, and a temperature switch is provided to control the motor by switching the plurality of semiconductors at a predetermined temperature.

Effect: With the above configuration, when the temperature inside the vehicle is lower than a predetermined temperature, the temperature switch switches the drive semiconductor to reduce the current flowing to the motor and weaken the exhaust air.
Exhaust air does not hit the heads of people riding in the back seat,
The discomfort caused by the exhaust air is eliminated. Furthermore, when the temperature inside the vehicle is higher than a predetermined temperature, the driving semiconductor is switched by a temperature switch to increase the current flowing through the motor to fully rotate the motor, thereby increasing the air purification effect inside the vehicle. In this way, regardless of the temperature inside the vehicle, no problem will occur even if the air purifier is operated to purify the air inside the vehicle.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a circuit diagram of a control device for a vehicle-mounted air cleaner showing an embodiment of the present invention. In FIG. 1, one end of a switch 12 is connected to the positive end of a car battery 11, and the other end of this switch 12 is connected to one end of a motor 13 and a control circuit 14, respectively. At the other end of the motor 13,
The collector of the first transistor 15 is connected to one end of the limiting resistor 16, and the other end of the limiting resistor 16 is connected to the collector of the second transistor 17. Further, contacts 18a and 18b of a temperature switch 18 are connected to the base terminals of the first transistor 15 and the second transistor 17, respectively. Further, the common terminal 18c of the temperature switch 18 is connected to the output end of the control circuit 14. Here, the operation of the temperature switch 18 is such that when the indoor temperature of the vehicle becomes higher than a predetermined set temperature, it is connected to the contact 18a side, and when it is lower, it is connected to the contact 18b side.

Further, the control circuit 14 is configured to generate a constant voltage at the output terminal when power is supplied. Furthermore, the base resistance 19.2 of the first and second transistor 15.17
The other end of the terminal 0 is connected to the negative terminal of the battery 11.

Further, the fan 21 rotates in synchronization with the rotation of the motor 13. Further, the filter 22 is installed in front of the fan 21.

The operation of the control device for a vehicle-mounted air cleaner configured as described above will be described below.

First, when the indoor temperature of the vehicle is higher than the predetermined set temperature of the temperature switch 18, when the switch 12 is closed, a current is supplied to the control circuit 14, and a voltage is generated at its output terminal. At this time, since the temperature switch 18 is connected to the contact 18a side, the first transistor 15 is on and the second transistor 17 is off. As a result, motor 1
3 is at full rotation, particles of dirty air such as cigarette smoke introduced by the fan 21 are adsorbed by the filter 22, and the air inside the vehicle is purified.

Next, when the indoor temperature of the car is lower than the predetermined set temperature of the temperature switch 18, the temperature switch 18 is connected to the contact TGB side, and when the switch 12 is closed, the second transistor 17 is turned on, and the second transistor 17 is turned on. 1 transistor 15 is turned off. As a result, the current flowing through the motor 13 is as follows: battery 11 → switch 2 → motor 13 → limiting resistor 16 → second transistor 17 → battery 11, and since the current is limited by the limiting resistor 16, the motor 13 rotates at full speed. The motor rotation speed will drop.

As described above, according to this embodiment, when the indoor temperature of the car is higher than the set temperature of the temperature switch 18, the motor 13 is rotated at full speed, and when the indoor temperature of the car is low, the motor rotation speed is reduced to exhaust air. It can weaken the wind.

Effects of the Invention As described above, according to the present invention, since the temperature switch switches the rotation speed of the motor at a predetermined temperature in the vehicle interior, the exhaust air can be weakened when the temperature in the vehicle interior is lower than the predetermined temperature. This eliminates the discomfort caused by the exhaust air hitting the heads of people sitting in the rear seats, and allows the air purifier to operate at all times to clean the interior of the vehicle, regardless of the temperature inside the vehicle. be.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a control device for a vehicle-mounted air cleaner according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional control device for a vehicle-mounted air cleaner. 13...Motor, 15...First transistor, 1
6...Limiting resistor, 17...Second transistor, 1
8...Temperature switch, 21...Fan, 22...
filter.

Claims (1)

[Claims] 1. An on-vehicle air purifier that uses a motor to rotate a fan and purifies incoming air using a filter, etc., wherein a plurality of drive semiconductors are provided to drive the motors with currents of different magnitudes, and the plurality of drive semiconductors are provided. A control device for a vehicle air cleaner, comprising a temperature switch that controls the motor by switching the semiconductor at a predetermined temperature.