JPH04284811A - Air cleaner for automobile - Google Patents

Abstract

PURPOSE:To prevent malfunction due to rapid changes of environment or disturbances to effect more precise automatic operation control by processing output pollution signal of a gas sensor or a particle sensor and circulation air flow signal corresponding to the output of a speed detector or a set state of an air conditioning system in a fuzzy arithmetic circuit. CONSTITUTION:A fuzzy arithmetic circuit 23 processes, as signals, pollution signals based on the output of a gas sensor 7 or a particle sensor 8 and circulation air flow signals corresponding to the output of a speed detector 21 or a set state of an air conditioning system setting device 22 so that operation capacity is increased as pollution or pollution signals become larger and said capacity is decreased as circulation air flow is large and circulation air flow signals become larger. Therefore, when the output of the sensor 7 or sensor 8 rises, drive output of a motor driven blower 2 to be given to a drive circuit 13 rises, and when signals from the detector 21 indicate that travelling speed is large or outdoor introduction quantity signals from the device 22 indicate that air flow quantity is large, drive output falls down.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cleaner for an automobile that controls the rotational speed of an electric blower depending on the dirt in the air inside the automobile.

0002

[Prior Art] In recent years, air purifiers for automobiles that control the rotational speed of an electric blower depending on the dirt in the air inside the automobile have been developed.
There is a need to drive an electric blower in a state that matches the user's actual experience.

Conventionally, this type of air cleaner has generally had a configuration as shown in FIGS. 6 and 7. The configuration will be explained below.

[0004] As shown in the figure, an air purifier main body 1 has an electric blower 2 built therein, and air taken in through an intake port 3 is filtered (purified) by a filter 4 and then discharged through an exhaust port 5 . A gas sensor 7 for detecting the gas concentration of indoor air and a particle sensor 8 for detecting the particle concentration are provided inside the grill 6 provided on the front surface of the air purifier body 1. The electric blower 2 receives power from a power source 9 and is controlled and driven by a control circuit 10 . The control circuit 10 is a stabilized power supply 1
1, and outputs a drive signal for the electric blower 2 to the drive circuit 13 based on signals from the operation circuit 12, the gas sensor 7, the particle sensor 8, and the operation circuit 12.
and a display circuit 15 that displays the control status.

In the above configuration, the processing of the signals from the gas sensor 7 and the particle sensor 8 by the arithmetic circuit 14 will be explained. As shown in FIG. 8, the outputs from the gas sensor 7 and the particle sensor 8 are often taken out as voltage values. Gas sensor 7
The output voltage VS captures the subsequent amount of change in output based on the output value V1 after the unstable period TS at the beginning of sensor energization, and if the output rises from V1 by a predetermined value VL or more, the electric blower Drive signal to drive circuit 1
Output to 3. Furthermore, even if the air purifier is operated for more than a predetermined time TH with the output voltage decreasing as shown in V2 or increasing as shown in V3, the output voltage VS of the gas sensor 7
If the values do not decrease, the standards are updated to V2 and V3, respectively, and operation is performed. Particle sensor 8 drives electric blower 2 similarly to gas sensor 7 when its output exceeds a predetermined value.

[0006]

[Problems to be Solved by the Invention] In such conventional air cleaners, the output of the gas sensor 7 or particle sensor 8 is regarded as an increased value from the reference value V1, and as shown in Fig. 9, the output increases due to changes in the environment. If the gas concentration stabilizes after reaching a value VLN that is close to and within VL, and at a certain time the gas concentration starts to rise again, the state of the increase value is considered to be less than the increase level VL that is originally desired for starting. When the electric blower 2 starts to be driven, or when the sensor output VS temporarily drops to V4 due to the opening/closing of the door or the influence of the wind as shown in Figure 9, the reference value V1 is updated to V4, and the reference value V1 is updated to V4. There is a problem in that the output returns to its original state when the influence stops, and the sensor output is mistakenly judged as an increase and the sensor operates, and when the car stops at an intersection, surrounding exhaust gas enters the cabin of the car. , the gas concentration increases, and when the vehicle is driven, the gas concentration decreases due to the ventilation effect, resulting in the problem of frequent repeated operation. For this reason, there was a problem in that it did not suit the user's experience.

The present invention solves the above problems by suppressing disturbances to the state detected by the sensor, preventing malfunctions caused by sudden changes in the environment such as exhaust gas and wind, and disturbances, thereby making it easier for the user to use the sensor. The purpose is to drive an electric blower in a state that matches reality.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an electric blower that is built into an air purifier body and sucks indoor air and discharges the purified air, and a drive that drives the electric blower. a circuit, a gas sensor for detecting the gas concentration in the vehicle interior, a particle sensor for detecting the particle concentration in the vehicle interior, a speed detector for detecting the traveling speed of the vehicle, and a setting device for setting the operating state of the vehicle interior air conditioning system. and a fuzzy arithmetic circuit that controls the operation of the drive circuit, and the fuzzy arithmetic circuit receives a dirt signal from the output of the gas sensor or the particle sensor, and a ventilation signal based on the output of the speed detector or the setting state of the air conditioning system. The first problem is that the amount of ventilation is processed as a signal, and the more dirt there is and the bigger the dirt signal, the greater the operating capacity is increased, and the more ventilation and the larger the ventilation amount signal, the smaller the operating capacity is controlled. It is used as a solution.

[0009] Furthermore, the fuzzy arithmetic circuit of the first problem-solving means performs arithmetic processing by lowering the sensitivity of the gas sensor or particle sensor as the frequency of intermittently stopping the vehicle increases. This is the second problem-solving method.

0010

[Operation] The present invention has the above-mentioned first problem solving means.
By predicting the natural ventilation function of the car as it travels and processing information that correlates multiple input signals, it is possible to perform automatic driving more accurately than with control based only on the output of a single sensor, and to better match the user's experience. You can get the operating status.

[0011] Furthermore, according to the second problem-solving means, the sensor sensitivity is reduced as the frequency of driving and stopping of the automobile increases;
This prevents repeated driving and stopping caused by exhaust gas when driving in traffic jams or around town.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. Note that components having the same configuration as those of the conventional example are given the same reference numerals, and description thereof will be omitted.

As shown in the figure, the air purifier main body 16 is installed in the passenger compartment of an automobile, and includes an electric blower 2 and a filter 4. Air taken in through an intake port 17 is filtered through the filter 4, and then air is passed through an exhaust port. Discharge from 18. Sensor case 19
has a built-in gas sensor 7 and a particle sensor 8, detects dirt in the air inside the vehicle, and connects the output to a control circuit 20. The speed detector 21 is a device that detects the traveling speed, such as a speedometer of a car. Air conditioning system setting device 22
This is used to set the operating state of the vehicle's air conditioning system, and is a signal output from the vehicle's air conditioning system that indicates whether or not outside air is being forcibly drawn into the vehicle interior and to what extent.

The fuzzy calculation circuit 23 receives a dirt signal from the output of the gas sensor 7 or the particle sensor 8 and the speed detector 2.
The output of 1 or the ventilation volume signal according to the setting state of the air conditioning system setting device 22 is processed as a signal, and the more dirt there is and the dirt signal is larger, the greater the operating capacity is. We are trying to control it so that its capacity is small. That is, as shown in FIG. 3, the fuzzy calculation circuit 23 calculates the output (a) of the gas sensor 7, the output (b) of the particle sensor 8, the output value (c) of the traveling speed signal from the speed detector 21, and the air conditioning system. The output to the drive circuit 13 is determined by performing a fuzzy operation in which a membership function is appropriately set so that the outside air introduction amount signal (d) from the outside air intake amount signal (d) and the output of the electric blower 2 become as shown in each graph. FIG. 4 is a graph showing the relationship with the output status of the electric blower 2 when (a) + (b) is a dirt signal and (c) + (d) is a ventilation amount signal.

To explain the operation in the above configuration, when the output of the gas sensor 7 or the particle sensor 8 increases, the fuzzy arithmetic circuit 23 determines whether there is a little or a lot of dirt and controls the electric blower 3 to be applied to the drive circuit 13. When the drive output is increased and the signal from the speed detector 21 indicates that the vehicle is traveling at a high speed, the drive output of the electric blower 3 is decreased because the ventilation effect is large, and the outside air introduction amount signal from the air conditioning system is By lowering the drive output as the amount of outside air introduced increases, it is possible to obtain automatic operation that more closely matches the user's experience.

Furthermore, when the signal from the speed detector 21 indicates that running and stopping are repeated, the larger the number of repetitions per unit time is, the more the fuzzy arithmetic circuit 23 performs the processing, as shown in FIG. By automatically setting the sensitivity of the gas sensor 7 to a low value, it is possible to prevent the air purifier from repeatedly stopping its operation due to the influence of exhaust gas when driving in a city or in traffic jams.

[0017]

Effects of the Invention As is clear from the above embodiments, according to the present invention, there is provided an electric blower which is built into the main body of the air purifier and sucks indoor air and discharges purified air, and a drive which drives the electric blower. a circuit, a gas sensor for detecting the gas concentration in the vehicle interior, a particle sensor for detecting the particle concentration in the vehicle interior, a speed detector for detecting the traveling speed of the vehicle, and a setting device for setting the operating state of the vehicle interior air conditioning system. and a fuzzy arithmetic circuit that controls the operation of the drive circuit, and the fuzzy arithmetic circuit receives a dirt signal from the output of the gas sensor or the particle sensor, and a ventilation signal based on the output of the speed detector or the setting state of the air conditioning system. The amount of dirt in the passenger compartment is processed as a signal, and the more dirt there is and the bigger the dirt signal is, the greater the driving ability is increased, and the more ventilation and the larger the ventilation amount signal, the greater the driving ability is controlled. In addition to the signals from the sensor that detects dirt, signals indicating the vehicle's running speed and the operating status of the air conditioning system are input to the air purifier's fuzzy calculation circuit, and the results of processing based on fuzzy theory are used to detect dirt. By determining the operating capacity to be large when the ventilation volume is large and low, and to decrease the operating capacity when there is little dirt and the ventilation volume is large, automatic operation that more closely matches the user's actual experience can be achieved. You can get the action.

Furthermore, the fuzzy arithmetic circuit performs arithmetic processing by lowering the sensitivity of the gas sensor or particle sensor as the frequency of intermittent driving and stopping of the car increases. The more frequently you repeat , the lower the sensitivity of the gas sensor can be automatically set.
It is possible to prevent the air purifier from repeatedly stopping and stopping during city driving or in traffic jams, resulting in a state similar to a malfunction, allowing for better operational control.

[Brief explanation of the drawing]

[Fig. 1] Block circuit diagram of an automobile air cleaner according to an embodiment of the present invention.

[Figure 2] System configuration diagram of the automotive air purifier

[Figure 3
] (a) Diagram showing the membership function of the air purifier for the same car (b) Diagram showing the membership function of the air purifier for the car (c) Diagram showing the membership function of the air purifier for the car ( d) Diagram showing the membership function of the automotive air purifier

[Figure 4] Diagram showing the membership function of the automotive air purifier

[Figure 5] Flowchart of the main parts of the automotive air purifier

[
Figure 6: Perspective view of a conventional air purifier

[Figure 7] Block circuit diagram of the air purifier

[Figure 8] Diagram showing an example of processing of sensor output of the air purifier

[Figure 9] Diagram showing another example of sensor output processing of the air purifier

[Explanation of symbols]

2　Electric blower 7 Gas sensor 8 Particle sensor 13 Drive circuit 16　Air purifier body 21 Speed detector 22 Air conditioning system setting device 23 Fuzzy operation circuit

Claims (2)

[Claims] 1. An electric blower built into an air purifier body that sucks indoor air and discharges purified air; a drive circuit that drives the electric blower; and a gas sensor that detects a gas concentration in a vehicle interior; A particle sensor that detects the particle concentration in the vehicle interior, a speed detector that detects the traveling speed of the vehicle, a setting device that sets the operating state of the vehicle interior air conditioning system, and a fuzzy calculation circuit that controls the operation of the drive circuit. In this case, the fuzzy arithmetic circuit processes a dirt signal from the output of the gas sensor or particle sensor and a ventilation amount signal according to the output of the speed detector or the setting state of the air conditioning system as signals, and when there is a lot of dirt, the dirt signal is An air purifier for an automobile that is controlled so that the larger the ventilation volume, the larger the driving capacity, and the larger the ventilation volume and the larger the ventilation volume signal, the lower the driving performance. 2. The vehicle according to claim 1, wherein the fuzzy arithmetic circuit performs arithmetic processing such that the sensitivity of the gas sensor or particle sensor is lowered as the frequency of intermittent operation and stop of the vehicle increases. air purifier.