JPH03271021A - Air cleaner for automobile - Google Patents

Abstract

PURPOSE:To prevent using up of a battery due to power consumption of a gas sensor, by providing a ripple detecting circuit to detect ripple voltage overlapped on an electric power source at rotation of an engine on a sensor part, and supplying current to the gas sensor by the output. CONSTITUTION:While an engine is on between B, G terminals of a battery 6, a ripple is generated corresponding to the rotating speed of a generator interlocked with the engine, and when the engine is off, voltage of the battery 6 without ripple is generated. The ripple is detected with a ripple detecting circuit 8, the output is input to a first control circuit 2, the circuit 2 supplies current to a gas sensor 1 during input the on-signal of the engine, the output is taken in to perform a computing process, and infrared rays are transmitted from a transmitting circuit 5 at prescribed intervals. When the circuit 8 outputs a signal indicating an engine stop, the transmission of the infrared ray signal is stopped after a prescribed time, and the current supply to the sensor 1 is stopped to reduce a current consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an air purifier that is used in the cabin of an automobile and has the function of detecting dirt in the cabin as a gas concentration using a gas sensor and automatically controlling the operation. .

Conventional technology In recent years, as automobiles have become more sophisticated, an increasing number of automobiles are equipped with air purifiers.At the same time, in order to improve the self-driving function of air purifiers, a sensor section that detects indoor dirt has been installed on the device itself. In recent years, the detection device has been removably attached to a device, and a signal transmitting section has been installed on the detection device, and the device itself can receive the signal and operate automatically.

Conventionally, this type of air cleaner has generally had a configuration as shown in Japanese Patent Application Laid-Open No. 63-39609. The configuration will be explained below with reference to FIG.

As shown in the figure, the device main body 16 is supplied with power from a power source 17 via a power plug 18, and includes a control circuit section 2o that controls the operation of an electric blower 19, and a sensor section 21 provided separately.
A receiving circuit receiving a signal from the controller and a control circuit section 2
0 receives the output of the receiving circuit 22 and the output of the operating circuit 23. The sensor section 21 is connected to the power supply 2
4, a sensor 25, and a signal transmitter 26 that outputs the output of the sensor 26 as a signal to the receiving circuit 22, and a signal superimposed on the power supply line. Signals are transmitted between the device main body 16 and the sensor section 21 through the A-i or infrared signal B path.

Problems to be Solved by the Invention Although it is extremely easy to deploy conventional air purifiers for use in automobiles, the power source for automobiles is a battery compared to the commercial power source for household use, and when the air purifier is stopped There is a problem that the battery will run out if the current is passed for a long time, and there are many obstacles in the case and inside the vehicle, making it difficult for the signal from the sensor to reach the device itself.Furthermore, the current sensor has a low current consumption. However, there was a problem that no ordinary dry cell battery could be used for long periods of time, and that constant signal transmission was not possible.

The present invention is intended to solve the above-mentioned problems, and a first object thereof is to prevent the battery from dying due to power consumption in the gas sensor by energizing the gas sensor only when the engine is rotating.

The second purpose is to prevent the battery from dying by energizing the gas sensor when the ACC switch is on, under the supervision of the user. Furthermore, a third purpose is to provide a function to prevent the battery from dying on the device main body side.

Means for Solving the Problems In order to achieve the above-mentioned first object, the present invention provides a gas sensor that detects dirt in a vehicle interior as a gas concentration, and a first control that converts the output of this gas sensor into a pulsed driving signal. a sensor unit having a circuit and a transmitting circuit that converts the output of the first control circuit into an infrared signal; and a second control circuit that receives the infrared signal of the sensor unit and controls the operation of the electric blower. The sensor section has a ripple detection circuit that detects a ripple voltage superimposed on the power supply when the engine is rotating, and the first control circuit is configured to control the output of the ripple detection circuit according to the output of the ripple detection circuit. The first means of solving the problem is to supply electricity to the In order to achieve the second objective, in addition to the first problem solving means, the sensor section is configured to detect that the ACC switch is turned on, instead of the ripple detection circuit.
The second means for solving the problem is that the first control circuit has a CC detection circuit, and the first control circuit is configured to energize the exhaust gas sensor based on the output of the ACC detection circuit. Furthermore, in order to achieve the third objective, in addition to the first or second problem solving means described above, a second control circuit of the main body of the device is configured to control the electric blower when there is no infrared signal from the sensor section for a predetermined period of time or more. The third solution to the problem is to stop the operation.

Effects of the present invention By using the first problem solving means described above, the gas sensor can be energized only when the engine is rotating and a ripple voltage is superimposed on the power supply, and it is possible to prevent the battery from dying due to energizing the gas sensor. In addition, according to the second problem-solving means, the gas sensor can be energized when the AC controller is turned on, the usage status of the battery is monitored by the user, and the energization is turned off when the battery is up. It can prevent the battery from dying. Furthermore, according to the third problem-solving means, the device main body can detect that the gas sensor is de-energized and the infrared signal is no longer transmitted, thereby preventing the device main body from running out of battery.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the first rotation and FIG.

As shown in the figure, a gas sensor 1 detects dirt in the vehicle interior as a gas concentration, and inputs the output to a first control circuit 2, which operates the electric blower 4 of the device body 3 at high speed. Converts into a pulse-coded operation signal that performs operations such as , slow operation, and stop.

The transmitting circuit 6 converts the output of the first control circuit 2 into an infrared signal and transmits it toward the device main body 3. The gas sensor 1, the first control circuit 2 and the transmitting circuit 5 are connected to the battery 6 B,
It is connected to the G terminal via a stabilized power supply circuit. The ripple detection circuit 8 detects the ripple voltage superimposed on the battery 6 when the automobile engine is rotating, and inputs its output to the first control circuit 2, and the first control circuit 2 detects the ripple voltage. The gas sensor 1 is energized by the output of the detection circuit 8. The gas sensor 1, the first control circuit 2, the transmitting circuit 5, and the ripple detection circuit 8 constitute a sensor section 9. The device body 3 includes an electric blower 4,
It is composed of a receiving circuit 1o, a second control circuit 1'1, a drive circuit 12, and an operation circuit 13.
The second control circuit 11 controls the operation of the electric blower 4 via the drive circuit 12 based on the received infrared signal, and when there is no infrared signal from the sensor section 9 for a predetermined period of time or more, the second control circuit 11 controls the operation of the electric blower 4 based on the received infrared signal. I am trying to stop driving.

The operation circuit 13 is used to switch the operating state of the device main body 3 to manual strong operation, manual weak operation, automatic operation, stop, etc.

The device main body 3 is installed on the rear tray of an automobile, and the sensor section 9 is installed at a position such as the ceiling of the vehicle interior where dirt in the vehicle interior can be detected.

To explain the operation in the above configuration, B of the battery 6,
As shown in Figure 3, between the G11 and the G11j terminals, while the car engine is on, a ripple occurs depending on the rotation speed of the generator that is linked to the engine, and when the engine is turned off, the voltage of the battery 6 becomes the ripple. disappears. This ripple is detected by the ripple detection circuit 8, and its output is input to the first control circuit 2. The first control circuit 2 energizes the gas sensor 1 while the engine-on signal is input, and outputs the ripple. is loaded and processed, and the transmitter circuit 6
As shown in FIG. 4, an infrared signal is transmitted at intervals of a predetermined time α. When the ripple detection circuit 8 outputs a signal indicating that the engine has stopped, it stops transmitting the infrared signal after a predetermined period of time, and also stops power supply to the gas sensor 1 to reduce current consumption. The timing is set to 1 when the engine detects the start of rotation. Note that the first control circuit 2 may stop emitting the infrared signal at the same time as the ripple detection circuit 8 outputs a signal indicating that the engine has stopped.

In this way, the ripple detection circuit 8 that detects the on-state of the engine is provided, and the sensor unit 9 can easily detect the gas concentration in the passenger compartment by using the two power supply wirings that are generally wired inside the vehicle body. It can be installed at any position, does not require maintenance of dry batteries, etc., and can prevent the battery 6 from being damaged.

Next, when the infrared signal from the sensor unit 9 does not continue for a predetermined period of time or more, the second control circuit 11 stops the operation of the electric blower 4, thereby installing a ripple detection circuit or the like inside the device body 3. Even if the stop signal of the infrared signal is overlooked, the stop signal can be safely stopped.

Next, another embodiment of the present invention will be described with reference to FIG. Components having the same configuration as those in the above embodiment are given the same reference numerals and explanations will be omitted.

As shown in the figure, the ACC detection circuit 14 detects the ACC of the vehicle.
It detects that the switch is on (ACC position of the key switch), and the ACC signal line 15
is input, and when the ACC7-switch is turned on, the output thereof is input to the first control circuit 2, and the output is input to the first control circuit 2.
The gas sensor 1 is energized by the output of the ACC detection circuit 14.

To explain the operation in the above configuration, as shown in FIG.
When the CC voltage is applied, the gas sensor 1 is energized and the infrared signal is emitted, and when the ACC voltage is not applied, the gas sensor 1 is energized and the infrared signal is stopped.

When the ACC voltage is applied, the battery 6 is monitored by the user, and the battery 6 can be prevented from draining.

Although this embodiment requires one extra wire, it is effective as a method that does not rely on ripple detection, which varies widely depending on the vehicle. It is also possible to take the power supply itself from the ACC signal line 15, but if the first control circuit 2 is constituted by a microcomputer, there is a problem that the memory in the microcomputer will be lost if the power supply is completely turned off.

Effects of the Invention As is clear from the above embodiments, according to the present invention, the sensor section has a ripple detection circuit that detects the ripple voltage superimposed on the power supply when the engine is rotating, and the first control circuit Since the gas sensor is energized by the output of the ripple detection circuit, power is supplied from the car's battery to the gas sensor, and the signal is transmitted to the device itself using infrared signals, while reducing battery damage due to power consumption in the sensor section. In addition, the sensor unit can be installed in the most effective location using two wires, and the sensor unit can detect when the ACC switch is turned on.
Since the first control circuit is configured to energize the gas sensor according to the output of the ACC detection circuit, it is under the user's supervision when the gas sensor is energized, and it is possible to prevent battery damage. In addition, the detection accuracy of the detection circuit may be lower than that of the ripple detection circuit, and the circuit configuration can be simplified.Furthermore, the second control circuit of the device main body controls the electric blower when there is no infrared signal from the sensor section for a predetermined period of time. Since the operation is stopped, a battery overload prevention mechanism can be easily constructed on the device main body side, and an air cleaner for automobiles having an automatic operation function that effectively utilizes a gas sensor can be provided.

[Brief explanation of drawings]

Fig. 3 is an input voltage waveform diagram of the ripple detection circuit of the air purifier for the same car, Fig. 4 is a diagram of the output signal waveform of the sensor part of the air purifier for the car, Fig. 6 6 is a block circuit diagram of the sensor section of an automobile air cleaner according to another embodiment of the present invention, FIG. 6 is an input voltage waveform diagram of the ACC detection circuit of the automobile air cleaner, and FIG. 7 is a conventional air cleaner. FIG. 2 is a block circuit diagram of the machine. 1... Gas sensor, 2... First control circuit, 3... Equipment body, 4... Electric blower, 5... Transmission Circuit, 6...Battery (power supply), 8...Ripple detection circuit.

Claims (3)

[Claims] (1) It has a gas sensor that detects dirt in the vehicle interior as a gas concentration, a first control circuit that converts the output of this gas sensor into a driving signal, and a transmission circuit that converts the output of this first control circuit into an infrared signal. The device includes a sensor section and a second control circuit that receives an infrared signal from the sensor section and controls the operation of the electric blower, and the sensor section detects ripples that are superimposed on the power supply when the engine is rotating. An air purifier for an automobile, comprising a ripple detection circuit for detecting voltage, wherein the first control circuit energizes the gas sensor based on the output of the ripple detection circuit. (2) The sensor section has an ACC detection circuit that detects that the ACC switch is turned on instead of the ripple detection circuit, and the first control circuit is configured to energize the gas sensor based on the output of the ACC detection circuit. The air cleaner for an automobile according to claim 1, comprising: (3) The air cleaner for an automobile according to claim 1 or 2, wherein the second control circuit of the device body is configured to stop operation of the electric blower when there is no infrared signal from the sensor section for a predetermined period of time or more.