JPS61196816A - Ventilation controller for vehicles - Google Patents

Abstract

PURPOSE:To obviate unnecessary selection of a ventilating device as well as to improve reliability ever so high, by emitting a signal commensurate to the specified pollutive degree and driving the ventilating device when air pollution inside a car room to be detected with a gas sensor is the specified level and lasts for more than the specified time long. CONSTITUTION:A fresh-air intake 10 is installed in the sidepiece of a motor bus, and this intake 10 should be free of opening or closing by an on-off operating member 9. Inside a ventilating duct 0 to be connected to this intake 10, there is provided with a ventilating device 1 adjoining to the intake 10, while each of heat exchangers 2 and 3 for cooling and heating. In addition, each of inside and outside air sensors 7 and 8 detecting air pollution is installed in and around a suction port of the ventilating duct 0 and the intake 10. And, when pollution of the outside air to be detected by the outside air sensor 8 is below the specified degree and pollution of the inside air to be detected the inside sensor 7 is above the specified degree and such a state lasts for more than the specified time long, the on-off operating member 9, the ventilating device 1 and an exhauster 6 are all operated according to the pollution degree.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a ventilation system for a vehicle that automatically controls the amount of ventilation according to the degree of pollution of the air inside and outside the vehicle interior, thereby reducing air pollution inside the vehicle interior. Regarding equipment.

[Conventional technology]

Conventionally, for example, Japanese Patent Application Laid-open No. 57-4419 (IPC classification...
・As shown in B60H3100), there is a known device that detects air pollution using a gas sensor and controls the ventilation of the vehicle interior.

[Problem that the invention seeks to solve]

However, if the gas sensor has good sensitivity and responsiveness, it may not be necessary to actually switch the operation of the ventilation system. For example, if a gas sensor is installed in the interior of a bus, if a passenger near the gas sensor accidentally blows cigarette smoke onto the gas sensor, the gas sensor will detect this and the entire interior of the vehicle will be affected.
The ventilation system operates even though the air is not very polluted.

Or, if a gas sensor is installed outside the vehicle and detects dirt in the outside air, it may momentarily detect exhaust gas when a truck passes each other, and the device may stop because it does not match the actual feeling. There is.

In this way, with conventional gas sensors that determine the degree of air contamination, even in the case of a momentary increase in the degree of contamination that has little effect on the air, it is possible to stop the ventilation system from operating, or from the stopped state. There is a possibility that it will switch to operation.

For this reason, the occupant feels uncomfortable when switching the ventilation system so urgently, and unnecessary switching is not desirable for the durability of the ventilation system.

The present invention has been made to solve the above problems.

[Means for solving problems]

Therefore, as shown in FIG. 1, the present invention provides a ventilation means for ventilating the inside of a vehicle, a gas sensor for detecting air pollution, and a system for detecting air pollution detected by the gas sensor at a predetermined level and lasting for a predetermined period of time or more. In this case, a technical means is adopted that includes a discriminating means that outputs a signal corresponding to the predetermined degree of contamination, and a control means that controls the ventilation means based on the signal from the discriminating means.

[For production]

By adopting the above technical means, the gas sensor detects the degree of contamination of the air inside the vehicle (inside air), for example, and when the degree of contamination of the inside air exceeds a predetermined value and this condition continues for a predetermined time, The means outputs a signal according to the dirtiness of the inside air.

As a result, the control means operates the ventilation means according to the degree of contamination, exhausts the dirty air inside the vehicle outside the vehicle, and introduces fresh air from outside the vehicle into the vehicle interior until the degree of contamination of the inside air reaches a predetermined value. Ventilate the vehicle interior until the level has decreased. At this time, the ventilation device may be stopped after a certain period of time has passed since the temperature has decreased to a predetermined value.

Further, when the gas sensor detects, for example, the degree of contamination of the air outside the vehicle (outside air), when the degree of contamination of the outside air is above a certain level and this state continues for a predetermined period of time, the determining means
It is determined that the outside air is contaminated, and in response to this signal, the control means stops the operation of the ventilation means to prevent the dirty outside air from being introduced into the vehicle interior.

〔Effect of the invention〕

Therefore, according to the present invention, the operating state of the ventilation system does not change due to instantaneous fluctuations in the degree of air pollution, so ventilation control can be performed without causing any discomfort to the occupants. Since unnecessary switching is prevented, the reliability of the device can be improved.

〔Example〕

2 and 3 show the arrangement of the components excluding the electrical circuits. Reference numeral 10 denotes an outside air intake port provided on the side of the bus vehicle, and an opening/closing member 9 is provided to open/close this intake port 10 by an actuator 9A. Note that the opening/closing member 9 may not be able to completely block the intake of outside air when the opening/closing member 9 is closed. The intake port 10 constitutes one of the upstream opening ends of the ventilation duct O, and the ventilation duct O is also provided with an opening end for taking in air inside the vehicle. Adjacent to the intake port 10, an air guide device l is provided. The air guide device 1 is made up of a combination of an electric motor and a fan, and by adjusting the rotational speed of the electric motor 1, the amount of air introduced can be adjusted, for example, in steps.

Inside the ventilation duct (O), a cooling heat exchanger 2, a heating heat exchanger 3, and an indoor circulation fan 4, which are known as temperature control units, are arranged. The fan 4 adjusts the amount of air blown by a known electric motor and an air blower ftHJ5 node circuit (not shown). The downstream opening end of ventilation duct 0 is extended to the ceiling of the passenger compartment, and the ventilation system indicated by several white arrows is connected to ventilation duct O.
is formed.

A natural exhaust port (or ventilation port) 5 is provided at an appropriate location that separates the interior of the vehicle from the outside of the vehicle, and an exhaust device that includes an electric motor and a fan and forcibly sends air from the interior of the vehicle to the outside of the vehicle. 6 is provided. The amount of air discharged by each air exhaust device is adjusted according to the rotational speed of the electric motor. As can be seen from the above, the ventilation means includes the actuator 9A, the opening/closing member 9, the air guide device 1, and the air exhaust device 6.

Further, an inside air sensor 7, which may be a known type, is disposed near the intake port in the ventilation duct 0, and detects dirt in the air inside the vehicle interior and generates an electric signal according to the dirtiness. Nearby is an outside air sensor 8, which may be a known type that detects dirt in the air outside the vehicle and generates an electric signal depending on the dirt.
is installed.

FIG. 4 shows the electrical circuit for ventilation control. Electric signals generated by the inside air sensor 7 and the outside air sensor 8 are applied to the microcomputer 14 via amplifier circuits 11.12 and A/D converter 13, respectively.

The microcomputer I4 processes the data provided from the two sensors according to a ventilation control program stored in advance, and sends an output signal based on the processing result to a drive circuit 15 for the actuator 9A and a drive circuit for the air guide device I. 16, and a drive circuit 17 for the exhaust device 6. The drive circuit 15 operates a switch so that the opening/closing member 9 selects a position between an open position and a closed position, and the drive circuit 16 operates, for example, when the air guide device l has a large air guide capacity. The drive circuit 17 operates to select from three levels: , small, and none.
A switch is operated to select whether the exhaust device 6 is activated or deactivated.

To briefly explain the control function of the microcomputer 14 using FIG. 4, when the air outside the vehicle is contaminated by the outside air sensor 8 to a predetermined degree or more and for a predetermined time or more, it outputs a "dirt" signal. and a drive circuit 1 to close the opening/closing member 9 in response to this signal.
a first control means 14B that provides an output signal to the inside air sensor 7; A second determining means 14C that outputs a signal corresponding to the degree of contamination when the degree of contamination continues for a predetermined degree or more, and a second determining means 14C that outputs a signal corresponding to the degree of contamination;
, drive circuits 15, 16.1 for the air guide member 1 and the air exhaust member 6
and a second control means 14D for providing an output signal for controlling each operation of 7.

Note that the microcomputer 14 has a data memory that temporarily stores detection data and data used in the calculation process.
(RAM).

A control program for realizing the above control functions of the microcomputer 14 is shown in FIG. The computer 14 starts executing the program in step 90 by turning on a main switch (not shown). In step 100,
After voltage is applied to the inside/outside air sensor 7.8, the open/close period is stabilized for about 20 seconds until a steady state is reached. When about 20 seconds have elapsed, step 101 is executed. In step lot, the reference value VIMIN of the inside air data and the reference value V, O of the outside air data
MIN and is set to the maximum value F F H that is normally not detected.

In step 102, based on the clock counter processing (not shown),
The process branches to average calculation processes 103 to 111 at timings of 250 ms and 750 ms within one second, and branches to control processes 201 to 208 at timings of O and 500 m5.

In the average calculation process, in step 103, the average value V100 of the outside air data VO input during 4 seconds is calculated, and in step 104, the outside air data reference value V OM is calculated.
Find the difference Δ from IN. The difference Δ is determined to be positive or negative in step 105, and the average value ■100 is the outside air data reference value VOMIN.
If it is smaller than that, in step 107 the outside air data reference value VO
Rewrite to MIN average. This means that the outside air data reference value VOMIN is made to match the lowest outside air data detected. Note that the reason for performing the average calculation is to remove noise from the detected data and stabilize it.

Regarding the inside air data, similar average value calculation and updating of the inside air data reference value VIMIN are performed in steps 108 to 111. However, if the average shyness data 7 is smaller than the reference value VIMIN, in step 110 the reference value VI
MIN is modified in response to the difference Δ in the outside air data. The purpose of this modification is to bring the determination level of the degree of contamination of the inside air closer to the degree of contamination of the outside air, thereby suppressing the change in the feeling of the occupants between the city and the suburbs.

In the control process, in step 201, outside air data ■
The difference S between O and the outside air data reference value VO141N is calculated. The difference S is compared with preset reference differences E and D. The standard differences E and D are such that mode M1 is determined so that the intake port 10 is closed when the degree of pollution of the outside air is greater than expected (SHLIT mode), and the intake port 10 is opened when it is smaller than expected (C'LEAN mode). The comparison result of Q step 201 with hysteresis is shown in step 2.
If it is determined in step 03 that the mode is "5HUT", the process proceeds to step 204, and if it is not the "5HUT" mode, the process proceeds to step 205. Step 20
In step 4, if the state of "5HUT" is longer than the predetermined time TI (for example, several seconds), the process proceeds to step 206, and a command is given to the drive circuit 15 to operate the first actuator 9A and close the opening/closing member IO. be done. Second, a command to stop the air guide device 1 is given to the drive circuit 16, and the third
A command to stop the exhaust device 6 is given to the drive circuit 17. Thus, the interior of the bus vehicle is not ventilated other than natural ventilation.

If the "5HUT" mode has not reached T1 time in step 204, the process returns to step 102.

On the other hand, step 203 is not in the "5HUT" mode. In other words, if it is determined that the outside air is clean and the mode is "CLEAN", the process proceeds to step 205 and the "CLEAN" mode is selected.
`` mode has not reached the predetermined time T2, the process returns to step 102, and if the predetermined time T2 or more has elapsed, the process proceeds to step 207.

In step 207, one of the four ventilation modes M2, Hi, Me, Lo, and 5HUT, is selected and determined in accordance with the difference U between the internal air data Vl and the internal air reference data VININ, and the process proceeds to step 208. In step 208, when any one of the four modes M2 continues for a predetermined time TI (for example, several seconds) or more, a control output signal corresponding to the selected mode is sent to the drive circuits 15 and 1.
Output on 6.17. In that case, each mode is realized as follows.

(1) Hi mode: Opens the opening/closing member 9, operates the wind guide device 1 at high wind guide capacity, and applies a control comb specific force signal to each drive circuit 15 to 17 so as to operate the wind exhaust device 6. .

(2) Me mode: Opening the opening/closing member 9, operating the air guide device 1 with a small air guide capacity, and applying a control comb specific force signal to each drive circuit 15 to 19 so as to operate the air exhaust device 6. .

(31Lo mode - A control output signal is applied to each drive port passage 15 to 17 so as to open the opening/closing member 9, stop the air guide device 1, and further stop the air exhaust device 6.

In each of the above Hi, Me, and Lo modes, when the ventilation fan 4 is operating in the low speed mode, for example, 3
:2:l ratio allows different ventilation volumes to be obtained.

(41S HOT mode - As described above.

As can be seen from the above, in the control flowchart shown in FIG. Discrimination means 1
Steps 207 and 208 correspond to step 4C, and step 208 corresponds to second control means 14D.

Next, the specific control flow of steps 204, 205, and 208 will be explained using the control programs shown in FIGS. 6 to 8.

First, the flow of control in step 204 will be explained with reference to FIG. In step 210, it is determined whether FLAG=1 is set, and if it is l, the process proceeds to step 211, and if it is not 1, the process proceeds to steps 212 and 213.
, 214, the timer T0 built into the microcomputer is reset once, and then the timer T6 is started and FLAG=1 is set. Further, in step 211, timer T is activated. 1 count time is a predetermined time T
Determine whether it has reached 1.

Next, the control in step 205 will be explained using FIG. In step 205, the timer T1. In order to identify it as 1I, another timer T1 and FLAG=2 are set inside the microcomputer 14.

That is, in steps 222, 223, and 224, after setting timer TI +2, To is started,
Set FLAG=2. In step 220, FLA
Determine whether G=2 or not, and if not, step 2
If it is 2, proceed to step 221, Tl4
It is determined whether the count time of 2 has reached a predetermined time T2.

Next, the control in step 209 will be explained in detail with reference to the control flowchart shown in FIG.

In steps 230, 231, 232, and 233, it is determined which mode M2 is selected, and in steps 234, 235, 236, and 237, it is determined whether or not a predetermined time T3 has elapsed in the selected mode. . At this time, when the mote M2 is in Hi mode, using the timer T, 43 built in the microcomputer 14, FLAG=
3 to determine the elapse of the predetermined time T. Similarly, when the mode M2 is Me, Lo, or 5HUT, the timer T is set in steps 235, 236, and 237, respectively. 4+ TM3. TM&+ and FLAG=4.5°6 are set to determine the elapse of a predetermined time T.

Note that each step 234, 235, 236.2
If it is determined in step 37 that the predetermined time has elapsed, the process proceeds to steps 238, 239, 240° 241, respectively, and the second control means 14D outputs Hi and Me.

The drive circuit 15 is set to each mode of Lo and 5HUT.
, 16. The control signal is output to 17.

By executing the above control program in this device, the intrusion of dirty outside air is prevented as mentioned above, and if the outside air is less dirty, the ventilation amount increases according to the dirtiness of the inside air. This reduces the amount of pollution in the air inside the vehicle while preventing temperature-controlled air from being released outside the vehicle.

In addition, when carrying out the present invention, the configuration and function (whether or not to continuously change the capacity) of the opening/closing member, the air guide device, and the air exhaust device are not limited.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the overall configuration of the present invention, and FIGS. 2 and 3 are a schematic longitudinal sectional view and a cross sectional view of a lotus vehicle to which the present invention is applied. FIG. 4 is a block diagram of the electric circuit, and FIGS. 5 to 8 are flowcharts of the control program executed by the computer. l...Air guide device, 6...Air exhaust device, 7...Inside air sensor, 8...Outside air sensor, 9'...Opening/closing member, IO
...Vehicle outdoor air intake, 14...Microcomputer, 14A...First control means, 14B...
Second control means. Figure 1 Figure 2

Claims (1)

[Scope of Claims] Ventilation means for ventilating a vehicle interior; a gas sensor for detecting air pollution; 1. A ventilation control device for a vehicle, comprising: a determining means for outputting a signal according to the degree; and a controlling means for controlling the ventilation means based on the signal from the determining means.