JPH0764255B2 - Ventilation system for vehicles - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation system for passenger compartments of railway vehicles, for example.

[0002]

2. Description of the Related Art The first prior art is shown in FIG. 2. Description of the Related Art In a vehicle for a Shinkansen or the like, an air supply device 2 that takes in outside air into a passenger compartment 1 that is a passenger compartment, and an exhaust device 3 that exhausts dirty air in the passenger compartment 1 to the outside of the vehicle are provided, and the air supply device 2 is also provided.
An air conditioner 4 is interposed between the room 1 and the cabin 1 to adjust the temperature of the outside air introduced by the air supply device 2. An exhaust device for the toilet may be provided separately. The air supply device 2 and the exhaust device 3 have a configuration in which a fan is driven by a motor. In some cases, the air supply / exhaust devices 2 and 3 are integrated, and one air supply / exhaust fan drives each fan for air supply and exhaust. The supply amount and the exhaust amount are adjusted by the fixed throttle 5 provided at the outlet of the exhaust device 3, and the throttle 5 may be provided on the supply side.

In such a prior art, since the passenger compartment 1 communicates with the outside of the vehicle, when the vehicles travel at high speed in the tunnel or pass each other in the tunnel, the pressure in the passenger compartment, that is, the passenger compartment suddenly changes, Passengers and occupants experience ear discomfort, referred to as "ear ears." It is known that the reason is that when a vehicle travels in a tunnel at high speed or passes each other in the tunnel, the pressure outside the vehicle changes abruptly, and this effect causes the pressure inside the vehicle to change abruptly. ing.

A second prior art technique that solves this problem is shown in FIG. This prior art is similar to the first prior art shown in FIG. 20, and corresponding parts bear the same reference numerals. Further, in this prior art, dampers 6 and 7 as shutoff devices are provided in series with the air supply and exhaust devices 2 and 3, respectively. The dampers 6, 7 are actuators 8, 9
It is driven by and can take a fully open position and a fully closed position. The actuators 8 and 9 are pneumatic cylinders,
It is realized by a combination with an electromagnetic valve that supplies compressed air to the pneumatic cylinder, and the connection state of the electromagnetic valve is switched by a signal from the control circuit 10 to operate the pneumatic cylinder and drive the dampers 6 and 7. Actuator 8, 9
May be a motor or a hydraulic cylinder instead of a pneumatic cylinder. The tunnel sensor 11 detects a tunnel.

When the vehicle is passing through the light section outside the tunnel, the dampers 6 and 7 are in the fully open position, and the passenger compartment 1 is normally ventilated by the air supply device 2 and the exhaust device 3.

When the vehicle enters the tunnel, the tunnel sensor 11 detects it, and the control device 10 controls the tunnel sensor 1
In response to the output of 1, the actuators 8 and 9 are operated,
Set the dampers 6 and 7 to the fully closed position. The fans of the air supply / exhaust devices 2 and 3 are always in operation, and when the dampers 6 and 7 are in the fully closed position, the passenger compartment 1 is shut off from the outside air. When the vehicle enters the tunnel, the pressure outside the vehicle, and hence the pressure inside the vehicle, decreases,
There is a prior art in which a pressure gauge for detecting this pressure is used instead of the tunnel sensor.

In the prior art shown in FIG. 21, even if the vehicles pass each other in the tunnel, the pressure change outside the vehicle does not reach the inside of the vehicle, and therefore the ears of passengers and occupants do not feel uncomfortable. . On the other hand, if the tunnel is long or there are a series of short lighted tunnels, the interior of the passenger compartment 1 will be closed for a long time due to the dampers 6 and 7 being fully closed. This pollutes the air inside the vehicle and causes hygiene problems. The source of contamination is the main carbon dioxide CO _2, according to one calculation, after the deadline, carbon dioxide concentration in about 3 minutes is greater than 2000 ppm.

A third prior art for solving such a problem is configured by providing the dampers 6 and 7 with stoppers so as not to be fully closed in the configuration of FIG. Alternatively, in another prior art, the actuators 8 and 9 are servo-operated so that the dampers 6 and 7 can be held at a narrowed opening before fully closed. In the servo configuration, an opening detector that detects the openings of the dampers 6 and 7 is provided.

In such a third prior art, even when a vehicle in a tunnel passes each other, it is possible to reduce the influence of the pressure fluctuation outside the vehicle on the pressure inside the vehicle, that is, the fluctuation while performing ventilation. In such prior art,
It is necessary to determine the size of the throttle openings of the dampers 6 and 7 so that the vehicle interior pressure does not fluctuate as much as possible and that the vehicle interior air is not contaminated. That is, it is necessary to determine the size of the throttle opening so that the fluctuation of the vehicle interior pressure is below a certain allowable value and the contamination of the vehicle interior air is within the allowable limit. Further, considering that the airtightness of the vehicle is affected by the secular change and the airtightness decreases as the vehicle ages, it is difficult to determine the optimum aperture size.

A fourth prior art for solving the above-mentioned disadvantages of the first and second prior arts is disclosed in, for example, Japanese Patent Laid-Open No. 63-1.
99170. In this prior art, in the passage communicating the inside and outside of the air supply device and exhaust device provided in the passenger compartment,
Arranged pressure relief means having a baffle made of an elastic body,
When the impact pressure of the air outside the vehicle reaches, the baffle blocks the passage and is configured to mitigate the pressure impact from entering the vehicle.

The fourth prior art as described above has an effect of alleviating a sudden pressure change, but cannot prevent a pressure change inside the vehicle with respect to a relatively slow pressure change outside the vehicle. That is, since the passage communicating between the inside and outside of the vehicle cannot be closed against a relatively slow pressure change outside the vehicle such that the baffle plate made of an elastic body is not sufficiently displaced, the outside pressure remains unchanged. Affects vehicle interior pressure. In the case of an older vehicle with a reduced airtightness, the baffle plate made of this elastic body is useless and cannot prevent fluctuations in the vehicle interior pressure.

The above-mentioned first to fourth prior arts are effective to some extent when the speed of the vehicle is not so high. In other words, when the vehicle speed is, for example, about 200 km / h or less, the fluctuation of the pressure outside the vehicle is relatively small, and therefore the fluctuation of the pressure inside the vehicle is not so large. However, in recent years, the speed of vehicles has tended to increase, and for example, TGV in France exceeds 500 km / h, and even in Japan, it is about to exceed 350 km / h on a trial basis. Generally, it is said that the magnitude of the fluctuation of the vehicle exterior pressure is proportional to the square of the vehicle speed. For example, in the case of a vehicle of 350 km / h, the variation value of the vehicle exterior pressure is () as compared with the case of a conventional vehicle of 200 km / h. 350/200) ² = 3.1 times.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the prior art. For example, even in a vehicle traveling at a high speed in a tunnel, the cleanliness of the air inside the vehicle can be improved. To provide a ventilation device for a vehicle that can suppress fluctuations in vehicle interior pressure while suppressing fluctuations in vehicle interior pressure even when airtightness inside the vehicle decreases due to aging of the vehicle. Is.

[0014]

According to the present invention, an air supply passage and an exhaust passage are provided in a vehicle compartment of a vehicle, and an air supply fan 17 for sucking the atmosphere into the vehicle compartment is provided in the air supply passage. An air supply valve 18 is provided in series with the air fan, an exhaust fan 19 for exhausting air in the vehicle compartment is provided in the exhaust passage, and an exhaust valve 20 is provided in series with the exhaust fan and provided in the vehicle compartment of the vehicle. And an in-vehicle pressure sensor 23 for detecting the in-vehicle pressure
And the primary delay circuit 26 to which the output of the in-vehicle pressure sensor 23 is given, and the output of the in-vehicle pressure sensor 23 and the primary delay circuit 2
The first subtraction circuit 29 for obtaining the difference from the output of 6 and the output of the first subtraction circuit 29, and when the output of the first subtraction circuit 29 is zero, the maximum value V31 is derived and the first value When the output of the subtraction circuit 29 is within the first range of the positive and negative first and second predetermined values VA31, VB31; VC31, a smaller value is derived as the output of the first subtraction circuit 29 approaches zero. When the output of the first function generation circuit 31 whose output remains zero outside the range of 1 and the output of the first subtraction circuit 29 and the output of the first subtraction circuit 29 is zero, the absolute value is maximum. If a certain negative maximum value V32 is derived and the output of the first subtraction circuit 29 is within the second range of the positive and negative third and fourth predetermined values VA32, VB32; VC33,
As the output of the first subtraction circuit 29 approaches zero, a negative value whose absolute value is small is derived, and outside the second range, the output of the second function generation circuit 32 whose output remains zero and the in-vehicle pressure sensor 23. A time change rate calculation circuit 34 for differentiating the output;
A second subtraction circuit 36 for obtaining a difference between respective outputs of the function generation circuit 31 and the time change rate calculation circuit 34, and a second function generation circuit 3
2 and the third subtraction path 37 for obtaining the difference between the outputs of the time change rate calculation circuit 34 and the output of the second subtraction circuit 37. When the output of the first function generating circuit 31 is larger than the output, the air supply valve drive means 38, 39b, 47 for decreasing the opening degree, and the third
In response to the output of the subtraction circuit 37, the exhaust valve 20 is driven,
A vehicle characterized by including drive means 39, 41, 52 for increasing the opening when the absolute value of the output of the second function generating circuit 31 is larger than the output of the time change rate calculating circuit 34. It is a ventilator. Further, in the present invention, an atmosphere opening passage communicating with the atmosphere is provided in the vehicle, and an atmosphere opening valve 22 is provided in the atmosphere opening passage, and in response to the outputs of the second and third subtraction circuits 36 and 37, When the air supply valve 18 or the exhaust valve 20 is controlled, the air release valve 22 is fully closed.

[0015]

In the air supply passage provided in the vehicle compartment of the vehicle, the air supply fan 17 and the air supply valve 18 are provided in series, and in the exhaust passage 16 provided in the vehicle compartment, the exhaust fan 19 and the exhaust valve 2 are provided.
0 is provided in series and an in-vehicle pressure sensor 23 for detecting the pressure in the vehicle interior of the vehicle is provided. The time change rate of the in-vehicle pressure, that is, the pressure change rate of the in-vehicle pressure is calculated by the time change rate calculation circuit 34. The air supply valve 18 and the exhaust valve 20 are determined by the outputs of the in-vehicle pressure sensor 23 and the time change rate calculation circuit 34 so as to prevent a person in the vehicle from feeling uncomfortable such as "ear ears". Control each.
In the non-obstructive area where humans do not experience discomfort such as "ear stuffing", the time change rate of the in-vehicle pressure is smaller as the difference between the pressure of the human respiratory system and the pressure that the ear receives from the outside is larger. However, it is known that discomfort is likely to occur. The air supply valve 18 and the exhaust valve 20 are controlled so as not to cause such discomfort.

Further, according to the present invention, the vehicle interior is provided with an atmosphere release passage 21 in which an atmosphere release valve 22 is interposed, and when the air supply valve 18 or the exhaust valve 20 is controlled, the atmosphere release valve 22 is fully closed. The operation of the intake valve 18 and the exhaust valve 20 achieves the discomfort of the person in the vehicle. The atmosphere release valve 22 is also in the fully open state when the air supply valve 18 or the exhaust valve 20 is not controlled, that is, when both are fully open, thereby eliminating the pressure difference between the inside and outside of the vehicle, It eliminates the difference between the pressure in the human respiratory system and the pressure the ear receives from the outside, thus keeping the pressure in the human respiratory system equal to the atmospheric pressure outside the vehicle, which increases the rate of change in vehicle pressure over time. Even if it changes, the person in the vehicle does not feel uncomfortable, that is, the margin can be increased.

Particularly according to the invention, the in-vehicle pressure sensor 23
Is given to the first-order delay circuit 26, the output of this first-order delay circuit 26 is given to the first subtraction circuit 29, and this subtraction circuit 29 is also given the output of the in-vehicle pressure sensor 23. The output of the first subtraction circuit 29 is given to the first and second function generation circuits 31 and 32, and the limit range of the rate of change of the vehicle interior pressure corresponding to the pressure detected by the vehicle interior pressure sensor 23 is the first and second function generation. Determined by the circuits 31, 32, it is thus possible to eliminate gradual fluctuations in the vehicle interior pressure.

Further according to the present invention, the vehicle interior pressure sensor 2
The output of 3 is given to the time change rate calculation circuit 34 to be differentiated, and the output of the time change rate calculation circuit 34 is given to the second and third subtraction circuits 36 and 37 respectively to be calculated. It becomes possible to suppress a large change in the rate of change over time.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall system diagram of an embodiment of the present invention. An air supply passage 15 and an exhaust passage 16 are connected to a passenger compartment 14 of a vehicle 13 such as a railway vehicle. An air supply fan 17 for sucking the atmosphere into the passenger compartment 14 is provided in the passenger air passage 15. An air supply valve 18 is provided in series with the air supply fan 17. The exhaust passage 16 is provided with an exhaust fan 19 for exhausting the air in the passenger compartment 14 to the outside.
An exhaust valve 20 is provided in series with 9. The air supply valve 18 and the exhaust valve 20 are arranged on the upstream side of the air supply fan 17 and the exhaust fan 19, respectively, whereby the fans 17, 1 when the valves 18, 20 are throttled.
The increase of the power of 9 is suppressed, and the energy saving effect is good.

The cabin 14 is also provided with an atmosphere opening passage 21 which communicates with the atmosphere, and an atmosphere opening valve 22 is interposed in the atmosphere opening passage 21. These valves 18, 20, 22
The opening can be adjusted like a damper.

In the passenger compartment 14, an in-vehicle pressure sensor 23 for detecting the pressure in the passenger compartment 14 is provided. These valves 1
8, 20, 22 are driven by actuators 47, 52, 61 shown in FIG. 2 described later. The actuators 47, 52, 61 constitute a servo system, and the valve 1
It includes a detector that detects each opening of 8, 20, and 22, and a servo system that is driven so that the output from the detector matches the opening indicated by the opening command signal. Although a servo motor may be used for the servo system, an induction motor such as a capacitor motor may be used. Instead of the motor, a hydraulic servo valve and a hydraulic cylinder are used to drive the actuator 4
You may comprise 7,52,61. Furthermore, as these actuators 47, 52, 61, a pneumatic actuating valve used for process control, and the valve 1
It may be realized by a positioner that drives 8, 20, 22.

FIG. 2 is a block diagram showing the electrical construction of the embodiment shown in FIG. The output of the in-vehicle pressure sensor 23 is given to the first-order delay circuit 26 via the line 27. This first-order delay circuit 26 has a transfer function of 1 / (1 + TM
• s), where TM is the time constant and s is the Laplace operator. The first-order lag circuit 26 can be configured by an operational amplifier circuit, a capacitor, and a resistor, or may be realized by executing a computer program. This first-order delay circuit 26 has a line 27
When the signal shown in FIG. 3 (1) is input, the output is output to the line 28 with the waveform shown in FIG. 3 (2).

The subtraction circuit 29 subtracts the output of the first-order lag circuit 26 via the line 28 from the output of the vehicle interior pressure sensor 23 via the line 27, and outputs it via the line 30 to 2
It is given to two function generating circuits 31 and 32. Subtraction circuit 29
May be configured by combining an operational amplifier circuit and a resistor, or may be realized by executing a program using a computer.

One of the function generating circuits 31 has the input / output characteristics shown in FIG. The function generating circuit 31 derives the maximum value V31 from the output when the input is zero, that is, when the openings of the valves 18 and 22 are values corresponding to full opening. When the input deviates to the positive or negative, the output decreases linearly in proportion to the range, and the range where the input exceeds VA31 and VB3.
When less than 1, the output remains zero. The other function generating circuit 32 has the input / output characteristics shown in FIG. When the input is zero, a negative value V32 having the maximum absolute value is derived, and when the input deviates to the positive or the negative, the absolute value of the output decreases, and the range where the input exceeds VA32, and VB
In the range below 32, the output remains zero. Such function generating circuits 31 and 32 can be configured by an operational amplifier circuit, a resistor and a diode, or can be realized by executing a program of a computer.

The output derived from the in-vehicle pressure sensor 23 to the line 27 is a time change rate calculating circuit 3 having a differentiating function.
4, the time change rate of the vehicle interior pressure, that is, the pressure change rate is calculated and obtained. Such a circuit 34 is a PID controller D for process control.
It can be composed of (differential) elements. Analog PI
In the case of a D controller, the D element can be configured by an operational amplifier circuit, a resistor, and a capacitor, and achieves a differentiating function only in a certain frequency band determined by the values of the resistor and the capacitor, and in other frequency bands. Does not achieve the differentiation function,
A so-called partial differentiator is configured, and at this time, each value of the resistor and the capacitor may be adjusted so that the frequency band in which the differentiating function is achieved has a value at which the present invention is implemented.
It is also possible to realize the circuit 34 by a program. At this time, the input signals to the circuit 34 at the timing times i and i−1 are x (i) and x (i−1), and the circuit 3
When the output of 4 is Δx (i), Δx (i) = x (i) −x (i−1) (1) That is, the circuit 34 derives the output Δx (i) which is the difference.

The output of the time change rate calculation circuit 34 is the coefficient unit 3
5 and its output magnitude is adjustable. The coefficient unit 35 may be provided in the preceding stage of the time change rate calculation circuit 34.

The subtraction circuit 36 is a function generation circuit 31 on one side.
Change rate calculation circuit 34 from the output of
Is subtracted and given to the PI control circuit 38. Another one
One subtraction circuit 37 subtracts the output of the function generation circuit 32 from the output of the time change rate calculation circuit 34 via the coefficient multiplier 35, and supplies the subtracted output to another PI control circuit 89. The PI control circuits 38 and 89 receive P (proportional) and I of the input signal.
Performs (integration) operation. Such PI control circuits 38, 8
9 may be used for process control, or may be realized by executing a computer program.

The output of one PI control circuit 38 is given to the first and second limiters 39b and 40, and the output of the other one.
The outputs of the two PI control circuits 89 are given to the third and fourth limiters 41 and 42, respectively. First limiter 39b
Has the input / output characteristics shown in FIG. The output increases as the input signal increases from zero, and even if the input signal exceeds a certain fixed value S1 and becomes large, the output signal remains at the upper limit value V39. Second limiter 4
0 has the input / output characteristics shown in FIG. 6 (2), the output is zero when the input is less than the constant value S1, and when the input signal becomes S1 or more, the output increases in proportion to the upper limit value V40.
Leading to.

The third limiter 41 has the input / output characteristics shown in FIG. 7A. When the input signal is less than E1, the output is proportional to the input signal and the output has the upper limit value V41. The fourth limiter 42 has the input / output characteristics shown in FIG. 7 (2). When the input signal is less than E1, the output is zero, and when the input signal is E1 or more, the output has the upper limit value V42.

The outputs of the first and third limiters 39 and 41 are given to actuators 47 and 52, and the actuators 47 and 52 have air supply valves 18 and The exhaust valve 20 is driven.

The outputs of the second and fourth limiters 40 and 42 are given to the signal selection circuit 56. The signal selection circuit 56 derives the smaller signal of the outputs of the limiters 40 and 42 and supplies it to the actuator 61. The specific configuration of the signal selection circuit 56 is shown in FIG. The signal selection circuit 56 includes an operational amplifier circuit 62, diodes 63 and 64, resistors 65 and 66 having the same resistance value,
And 67. The actuator 61 drives the atmosphere opening valve 22 so that the opening degree corresponds to the input voltage.

Prior to the description of the operation of the embodiment of the present invention shown in FIGS. 1 to 8, the cause of the "ear deafening" of a person in the passenger compartment 14 will be described with reference to FIGS. 9 and 10. To do. As shown in FIG. 10, the cause of the “ear twitch” phenomenon is that the pressure difference between the pressure of the human respiratory system and the pressure that the ear receives from the outside, as shown on the horizontal axis of FIG. It is known that the time change rate of the in-vehicle pressure shown on the vertical axis, that is, the pressure change rate is involved. The shaded region below the line 62 is a region where there is no hindrance to "feeling of ear", and the region above the line 62 is an uncomfortable region where discomfort occurs. When the difference between the pressure in the human respiratory system and the pressure the ear receives from the outside is small,
The time change rate of the pressure at which "ear tongue" is felt is large, and when the difference is large, the time change rate of the pressure at which "ear tongue" is felt becomes small. In other words, the phenomenon that causes "ear twitching" is caused by the rate of change in pressure over time, but the unaffected region is the difference between the pressure in the human respiratory system where the pressure change occurs and the pressure received from the outside. Depends on. Therefore, in the non-obstructive area below the line 62 in FIG.
It is necessary to control the exhaust valve 20 and the exhaust valve 20 to control the pressure inside the passenger compartment 14.

FIG. 10 is a diagram for explaining the characteristics of the function generating circuits 31, 32 based on FIG. 9 described above. The horizontal axis of FIG. 10 represents the vehicle interior pressure of the passenger compartment 14, and the vertical axis represents the vehicle interior pressure change speed, that is, the time change rate of the vehicle interior pressure. The lines 63 and 64 are lines corresponding to the line 62 in FIG. 9 in which the phenomenon of “ear twitching” occurs, and in the present invention, in order to prevent unpleasant sensation from occurring, the function generating circuit 31 does not include the line in FIG. 4 is defined in correspondence with the range shown by lines 65 and 66 in FIG. 6, and the characteristic shown in FIG. 5 is defined in the function generating circuit 32 corresponding to lines 67 and 68. In order not to cause "earing" discomfort, the valves 18, 20, 32 are controlled such that there is in-vehicle pressure in the area indicated by lines 65-68.

The operation will be described with reference to FIGS. 11 to 13. As shown by the line 72 in FIG. 11A, the pressure detected by the in-vehicle pressure sensor 23 is a positive pressure,
It is assumed that the pressure inside the vehicle changes in the increasing direction. 1
The output of the next delay circuit 26 is as shown by the line 73 in FIG. 11 (1), and thus the output of the subtraction circuit 29 is as shown in FIG. 11 (2). Therefore, the output waveform of the function generating circuit 31 becomes as shown in FIG. 11C, and the output waveform of the other function generating circuit 32 is a waveform obtained by inverting the waveform of the function generating circuit 31 described above. This is as shown in FIG. 11 (4). The waveform derived from the time change rate calculation circuit 34 through the coefficient unit 35 is as shown in FIG. 11 (5). Room 14
When the time change rate of the vehicle interior pressure of is positive, the time t
From 1 to t2, the air supply valve 18 is fully closed as shown in FIG. 11 (6), at this time, the exhaust valve 20 remains fully open as shown in FIG. The open valve 22 is fully closed as shown in FIG. 11 (8). Thus, the air supply valve 18 is closed to prevent an increase in the vehicle interior pressure, and the atmosphere release valve 22 is closed. At this time, the exhaust valve 20 is arranged to prevent the air in the passenger compartment 14 from being polluted by carbon dioxide gas. Is open to.

In the range of t4 from time t2 to t3,
The pressure in the passenger compartment 14 drops, and at this time, the atmosphere release valve 22
Is fully closed, and the exhaust valve 20 is fully closed, so that the pressure inside the vehicle is prevented from decreasing, and at this time, the air supply valve 18 is opened and the air in the passenger compartment 14 is prevented from being polluted. .
In this way, the increase and decrease of the pressure inside the vehicle are suppressed, and it is possible to prevent the generation of discomfort for the person in the passenger compartment 14 that causes the phenomenon of "ear loss".

Further, as shown in FIG. 12, the fluctuation of the pressure detected by the in-vehicle pressure sensor 23 is shown in FIG.
12 (1), the output of the in-vehicle pressure sensor 23 is as shown in FIG. 12 (1), and the output derived from the subtraction circuit 29 to the line 30 is as shown in FIG. 12 (2). Yes, this allows each function generation circuit 3
The waveforms derived from 1, 32 are shown in FIG.
2 (4). The output derived from the time change rate calculation circuit 34 through the coefficient unit 35 is shown in FIG.
(5) has the waveform shown in FIG.
As shown in FIG. 12 (6), the exhaust valve 20 is
As shown in (7), the atmosphere release valve 22 is also shown in FIG.
It operates as shown in (8). When the pressure increase in the passenger compartment 14 is slight, the opening degree of the air supply valve 18 is only reduced as shown in FIG. 12 (6) and the exhaust valve 20 is not fully closed. The opening is narrowed like 12 (7), and it cannot be fully closed. The atmosphere release valve 22 is shown in FIG.
As indicated by 2 (8), the intake valve 18 and the exhaust valve 20 remain fully closed during the operation.

Further referring to FIG. 13, the pressure in the passenger compartment 14 detected by the in-vehicle pressure sensor 23 is shown in FIG.
A case in which the value is lowered as shown in FIG. Subtraction circuit 2
The output having the waveform shown in FIG. 13 (2) is derived from 0 to the line 30, whereby the function generating circuit 31,
Outputs having waveforms shown in FIGS. 13 (3) and 13 (4) are derived from 32. When the time change rate calculation circuit 34 derives the waveform shown in FIG. 13 (5) through the coefficient unit 35, and when the pressure in the passenger compartment 14 is reduced by this, the air supply valve 18 is shown in FIG. 13 (6). As shown in FIG. 13, the air is taken into the passenger compartment 14 during the period from t5 to t6.
It is narrowed down as shown in (7). Also, from time t6 to t7
When the pressure in the passenger compartment 14 changes in the increasing direction as shown by, the intake valve 18 is throttled as shown in FIG. 13 (6), and the exhaust valve 20 is fully opened as shown in FIG. 13 (7). It is said that When the air supply valve 18 and the exhaust valve 20 are controlled,
The atmosphere release valve 22 is kept in a fully closed state as shown in FIG. 13 (8).

The atmosphere opening valve 22 is kept in the fully opened state when the air supply valve 18 and the exhaust valve 20 are fully opened, whereby the pressure difference between the pressure inside the passenger compartment 14 and the pressure outside the vehicle can be eliminated. Therefore, the vehicle interior pressure in the passenger compartment 14 is made equal to the vehicle exterior pressure, and thus, as described with reference to FIG. 9, when the difference between the pressure of the human respiratory system and the pressure that the ear receives from the outside is small, the vehicle interior pressure is reduced. Even if the rate of change over time is large, it is useful for increasing the margin that causes discomfort for people in the vehicle, such as "ear ears."

As another embodiment of the present invention, the input / output characteristic of the function generating circuit 31 is set to the characteristic shown in FIG. 14 instead of the one shown in FIG. 4, and the output is zero when the input is VC31 or more. To do. The input / output characteristic of the other function generating circuit 32 is the characteristic of FIG. 15 instead of that of FIG. 5, and the output is zero when the input is less than the negative VC33. According to such an embodiment, when the vehicle interior pressure of the passenger compartment 14 is high, the temporal change rate of the vehicle interior pressure is controlled in the negative direction, and the passenger compartment 1
When the vehicle interior pressure of 4 is low, the time change rate of the vehicle interior pressure is controlled in the positive direction. As a result, the in-vehicle pressure is controlled to near zero, which has a high margin of the rate of change of the in-vehicle pressure with
It is possible to prevent the discomfort of "ear ears" from occurring. In this way, it is possible to effectively suppress the occurrence of discomfort when the vehicle runs at high speed, particularly in a long tunnel or a continuous tunnel with a short light section.

FIG. 16 is a block diagram of another embodiment of the present invention. This embodiment is similar to the previous embodiment, and corresponding parts bear the same reference numerals. In the embodiment of FIGS. 1 to 15 described above, the opening degree of the air supply valve 18 and the exhaust valve 20 can be adjusted between fully closed and fully opened. The exhaust valve 20a can operate only in each of the two states of fully closed and fully opened, and this also applies to the atmosphere opening valve 22a. Actuators 47, 5 for these valves 18a, 20a, 22a
2 and 61 are signal generation circuits 3 having hysteresis characteristics
Operated in response to the outputs from 9a, 41a and 85. The signal generating circuit 39a has the characteristics shown in FIG. 17, and the level of the input signal increases when the air supply valve 18a is in the fully closed state, exceeds the value S1 and reaches the value S11, and is fully opened. After that, when the input signal becomes less than S1, it is in the fully closed state. Similarly, as shown in FIG. 18, the exhaust valve 20a is fully opened when the input signal becomes E11 or more from the fully closed state, and once the input signal becomes less than E1 after being fully opened. It will be fully closed. Furthermore, the signal generating circuit 85 is shown in FIG.
As shown in, when the atmosphere release valve 22a is in the fully closed state, the input signal becomes full open when the input signal becomes F11 or more, and when the input signal becomes less than F1 once the full open state occurs. It will be in a closed state. Although such signal generating circuits 39a, 41a, 85 can be realized by using discrete electronic parts, they may be realized by executing a program of a computer.

As still another embodiment of the present invention, when the input signal has a predetermined value, for example, (S1 + S11) / 2 or more, instead of each of the above-mentioned circuits 39a, 41a and 85 having hysteresis characteristics, The signal for fully opening the air supply valve 18a is immediately derived, and once the valve is in the open state, after a predetermined time elapses with the timer from the time when the input signal becomes less than the value (S1 + S11) / 2, the air supply valve 18a is supplied. The air valve 18a can be configured to operate a signal that causes the air valve 18a to be in a fully closed state.

Due to the structure having such a hysteresis characteristic and the structure including the timer described above, the air supply valve 18 is provided.
a, the exhaust valve 20a and the atmosphere opening valve 22a are prevented from being frequently opened and closed, and at the same time, these valves 18
Since a, 20a, and 22a are only fully closed and fully opened operations, and the throttle opening is not changed, the overall configuration can be simplified.

[0043]

As described above, according to the present invention, the air supply fan 17 and the air supply valve 18 are connected in series in the air supply passage connected to the vehicle compartment, and the exhaust gas connected to the vehicle compartment. An exhaust fan 19 and an exhaust valve 20 are provided in series in the passage, and the pressure inside a vehicle compartment such as a passenger compartment is detected by an in-vehicle pressure sensor 23, and the time change rate of the in-vehicle pressure is calculated. Based on the rate of change over time, the air supply valve 18 and the exhaust valve 20 are provided so that people in the vehicle do not feel uncomfortable.
Is controlled, even if the vehicles pass each other at a high speed in the tunnel, the pressure inside the vehicle is prevented from fluctuating due to the influence, which may cause discomfort for passengers and occupants such as “ear deafening”. It is prevented.

Furthermore, according to the present invention, as described above, the vehicle interior pressure sensor 23 detects the vehicle interior pressure and controls the air supply valve 18 and the exhaust valve 20, respectively. Even if the density is reduced, it is possible to prevent the discomfort of a person in the vehicle.

Particularly according to the present invention, the in-vehicle pressure sensor 23
Is given to the first-order delay circuit 26, the output of the first-order delay circuit 26 is given to the first subtraction circuit 29, and the output of the in-vehicle pressure sensor 23 is given to the first subtraction circuit 29. Output of the first and second function generating circuit 3
Since it is applied to the first and the second motors 32 and 32, the excellent effect of being able to remove the gradual fluctuation of the vehicle interior pressure is achieved.

Further, as described above, in the present invention, the output of the in-vehicle pressure sensor 23 is given to the time change rate calculation circuit 34, and the output of the time change rate calculation circuit 34 is supplied to the second and third subtraction circuits 36 and 37. Given that the detection result of the time change rate of the vehicle interior pressure is configured to be negatively fed back,
It is possible to suppress a large change in the rate of change over time of the vehicle interior pressure.

Furthermore, such a structure according to the present invention is simple and can be realized at low cost.

[Brief description of drawings]

FIG. 1 is an overall system diagram of an embodiment of the present invention.

FIG. 2 is a block diagram showing an electrical configuration of an embodiment of the present invention.

FIG. 3 is a diagram for explaining the operation of the first-order delay circuit 26.

FIG. 4 is a diagram showing an input / output characteristic of a function generating circuit 31.

FIG. 5 is a graph showing input / output characteristics of the function generating circuit 32.

FIG. 6 is a diagram showing input / output characteristics of first and second limiters 39 and 40.

FIG. 7 is a diagram showing input / output characteristics of third and fourth limiters 41 and 42.

8 is an electric circuit diagram showing a specific configuration of a signal selection circuit 56. FIG.

FIG. 9: A region where there is no hindrance and a discomfort that does not cause the phenomenon of “ear twitching” depending on the difference between the pressure of the human respiratory system and the pressure that the ear receives from the outside and the time change rate of the vehicle interior pressure It is a graph which shows the uncomfortable area which produces.

10 is a diagram for explaining the characteristics of the function generating circuits 31 and 32 based on the line 62 shown in FIG.

FIG. 11 is a waveform diagram for explaining an operation when the vehicle interior pressure of the passenger compartment 14 greatly increases.

FIG. 12 is a waveform diagram for explaining the operation when the vehicle interior pressure of the passenger compartment 14 slightly increases.

FIG. 13 is a waveform diagram for explaining the operation when the vehicle interior pressure in the passenger compartment 14 decreases.

FIG. 14 is a diagram showing an input / output characteristic of a function generating circuit 31 according to another embodiment of the present invention.

FIG. 15 is a diagram showing characteristics of a function generating circuit 32 according to another embodiment of the present invention.

FIG. 16 is a block diagram showing an electrical configuration of still another embodiment of the present invention.

FIG. 17 is a diagram showing input / output characteristics of the signal generating circuit 39a.

FIG. 18 is a diagram showing input / output characteristics of the signal generating circuit 41a.

19 is a diagram showing input / output characteristics of the signal generating circuit 85. FIG.

FIG. 20 is a diagram showing a prior art.

FIG. 21 is a diagram showing another prior art.

[Explanation of symbols]

 13 Vehicle 14 Guest Room 15 Air Supply Passage 16 Exhaust Passage 17 Air Supply Fan 18 Air Supply Valve 19 Exhaust Fan 20 Exhaust Valve 21 Atmosphere Release Passage 22 Atmosphere Release Valve 23 Vehicle Pressure Sensor 26 Primary Delay Circuit 31, 32 Function Generation Circuit 34 Hours Change rate calculation circuit 35 Coefficient circuit 38,89 PI control circuit 39 First limiter 40 Second limiter 41 Third limiter 42 Fourth limiter 47,52,61 Actuator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Fumihito Kimura Inventor Fumihito Kimura 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries Ltd. Kobe factory inspector Manji Mizutani (56) References 168560 (JP, A) Actual development 1-142365 (JP, U)

Claims (2)

[Claims] 1. A supply fan and an exhaust passage are provided in a vehicle compartment of a vehicle, and the supply fan 1 sucks the atmosphere into the vehicle compartment in the supply passage.
7, an air supply valve 18 is provided in series with the air supply fan, an exhaust fan 19 for exhausting air in the vehicle compartment is provided in the exhaust passage, and an exhaust valve 20 is provided in series with the exhaust fan. An in-vehicle pressure sensor 23, which is provided in the vehicle interior of the vehicle to detect the in-vehicle pressure, a first-order delay circuit 26 to which the output of the in-vehicle pressure sensor 23 is given, and an in-vehicle pressure sensor
3 for determining the difference between the output of the third delay circuit 26 and the output of the first-order delay circuit 26
In response to the outputs of the subtraction circuit 29 and the first subtraction circuit 29, when the output of the first subtraction circuit 29 is zero, the maximum value V3
1 and the output of the first subtraction circuit 29 has positive and negative first and second predetermined values VA31, VB31; VC.
Within the first range of 31, a smaller value is derived as the output of the first subtraction circuit 29 approaches zero, and outside the first range, the output remains at zero. In response to the output of the subtraction circuit 29, the first subtraction circuit 29
When the output of is zero, the negative maximum value V32 having the maximum absolute value is derived, and the output of the first subtraction circuit 29 has positive and negative third and fourth predetermined values VA32, VB32;
Within the second range of the VC 33, a negative value having a smaller absolute value is derived as the output of the first subtraction circuit 29 approaches zero, and outside the second range, the output remains zero. 32, a time change rate calculation circuit 34 that differentiates the output of the in-vehicle pressure sensor 23, a second subtraction circuit 36 that obtains the difference between the outputs of the first function generation circuit 31 and the time change rate calculation circuit 34, and a second In response to the output of the third subtraction path 37 and the second subtraction circuit 37 for obtaining the difference between the outputs of the function generation circuit 32 and the time change rate calculation circuit 34, the air supply valve 18 is driven to calculate the time change rate. The first function generating circuit 3 rather than the output of the circuit 34
When the output of 1 is large, the exhaust valve 20 is driven in response to the outputs of the air supply valve driving means 38, 39b, 47 for decreasing the opening and the third subtraction circuit 37, and the time change rate calculation circuit 34 is operated.
When the absolute value of the output of the second function generating circuit 31 is larger than the output of, the driving means 3 of the exhaust valve 20 for increasing the opening degree
A vehicle ventilation device comprising: 9, 41, 52. 2. An atmosphere opening passage communicating with the atmosphere is provided inside the vehicle, and an atmosphere opening valve 22 is provided in the atmosphere opening passage, and in response to the outputs of the second and third subtraction circuits 36, 37, The vehicle ventilation device according to claim 1, further comprising means for fully closing the atmosphere release valve 22 when controlling the air supply valve 18 or the exhaust valve 20.