KR100643962B1 - Vehicle rollover prevention device using air spring - Google Patents

Abstract

The present invention is to prevent overturning of a vehicle having a support rod mounted on the vehicle body side and a wheel spring mounted on the wheel side, and an air spring consisting of a bellows connected to the support rod and a leveling valve for controlling intake and discharge of air into the bellows. An apparatus comprising: a plurality of angle sensors each mounted on a vehicle body side at a position adjacent to the wheel to sense a degree of inclination of the vehicle body; a vehicle body upward device for lifting the vehicle body by raising the support rod; and the bellows. The leveling valve is controlled according to the height of the vehicle, and when the at least one angle detected by the angle sensor reaches the maximum safety inclination angle of the vehicle, the vehicle is determined to be inclined and mounted on the inclined wheel side so that the vehicle body is in equilibrium. It characterized in that it comprises a control unit for driving the vehicle body upward device. As a result, when the change in the behavior attitude of the large vehicle equipped with the air spring reaches the maximum safety inclination angle (critical inclination angle), it is possible to prevent overturning caused by tilting the vehicle body.

Air spring, angle sensor, rollover protection

Description

Apparatus for preventing of vehicle upset using air spring}

1 is a simplified diagram of an ultra low CNG bus;

2 is a simplified diagram showing the maximum safety inclination angle of the bus,

3 and 4 is a configuration diagram of the rollover prevention device applying the air spring according to the present invention,

5 is a structural diagram of an air spring of a conventional air suspension device;

<Description of Symbols for Major Parts of Drawings>

10: roll over device 11: body

12 bumper stopper 13 pneumatic cylinder

14: bellows 15: stop plate

16: angle sensor 17: weight

18: air tank 19: ECU

20, 21: valve

The present invention relates to a vehicle overturn prevention apparatus, and more particularly to a vehicle overturn prevention apparatus using the air spring of the suspension system of the vehicle.

In general, a suspension system of a vehicle is a device that connects the axle to the vehicle body or frame so as not to directly connect the vibration or shock received from the road surface to the vehicle body while driving, thereby preventing damage to the body and cargo and improving ride comfort. to be. The suspension includes a chassis spring for mitigating impact from the road surface, a shock absorber for controlling the free vibration of the chassis spring to improve ride comfort, and a stabilizer for preventing rolling of the vehicle.

Chassis spring of the vehicle suspension is installed between the vehicle body and the wheels to absorb the shock and vibration of the wheels when the vehicle is driven and not transmit it to the vehicle body. There is an air spring using.

The air spring has the advantage of keeping the height of the car constant, but it requires a device that adjusts the air pressure according to the load and a compressor that outputs compressed air.It is used in large vehicles such as buses because of its complicated structure. do. These air springs have a bellows shape, a bellows type that acts as a spring by changing its internal volume and pressure, and a diaphragm type that inverts a rubber membrane as it expands and contracts. It is divided into the combined type, which is a combination of the bellows type and the diaphragm type.

The structure of a conventional air spring is shown in FIG. The air spring 100 is provided between the vehicle body and the wheels. A support rod 103 on which the bumper stopper 102 is mounted is fixed to the vehicle body, and a bellows 104 accommodating the support rod 103 is mounted on the wheel side. And, the side of the bellows 104 is connected to a leveling valve (not shown) that functions to adjust the internal pressure of the air spring in accordance with the increase or decrease of the load. When the load increases and the bellows height is lower than the prescribed level, the leveling valve is operated so that the compressed air enters the bellows 104 and the bellows 104 expands, thereby extending the height of the vehicle body to become the specified height.

Meanwhile, as shown in FIG. 1, the CNG bus (1) of the ultra low-phase compressed gas (1) has a CNG tank (3), which is a fuel storage device, mounted on the roof, and thus a high load on the roof of the bus together with the weight of the air conditioner (2). This is loaded. In addition, the ultra-low CNG bus has a lower frame weight than the existing vehicle due to the lower interior floor or floor surface than the existing vehicle. Accordingly, the ultra low profile CNG bus satisfies the safety inclination angle (35 degrees), but due to the excessive load on the roof, the risk of overturning is higher than that of other vehicles. In addition, a large vehicle such as an ultra-low-rise CNG bus has a disadvantage in that the inclination of the vehicle body is severe compared to other cars when the suspension is inclined around the roll center (4) due to the use of the air suspension of FIG. 2. have.

However, if one wheel side is inclined while a large vehicle equipped with a heavy load such as an ultra-low CNG bus is located on an inclined surface, it is only necessary to expand the bellows by injecting air into the bellows of the air spring as in the prior art. Is difficult to balance the car body.

Accordingly, the present invention has been made to solve the above problems, to prevent overturning caused by tilting the vehicle body when the change in the behavior attitude of a large vehicle equipped with an air spring reaches the maximum safety inclination angle (critical inclination angle). It is an object of the present invention to provide a vehicle overturn prevention device.

The present invention for achieving the above object, an air spring consisting of a support rod mounted on the vehicle body side and a bellows mounted on the wheel side and connected to the support rod and supply of air to the bellows of the air spring. In the air spring device of a vehicle having a leveling valve for controlling the discharge and
An angle sensor mounted on both side wheel adjacent portions of the vehicle body and detecting an inclination degree of the vehicle body;
A pneumatic cylinder, an air tank, and the cylinder, which are formed of the support rod and mechanically connect the vehicle body and the bellows, and form a closed space pressure-independently from the bellows, and a piston rod moving in the cylinder casing. A vehicle body upward device comprising a pair of valves for controlling the inflow and outflow of air between the casing and the air tank;
The control unit controls the leveling valve according to the height of the bellows, and drives the vehicle body upward device mounted on the inclined wheel side when at least one angle detected by the angle sensor reaches the maximum safety tilt angle of the vehicle. Characterized in that it comprises a.

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Here, one of the pair of valves supplies air to the piston lower space of the pneumatic cylinder in the normal driving state and discharges air from the lower space to the atmosphere in an emergency, and the other valve is the pneumatic pressure in the normal driving state The air in the piston upper space of the cylinder is discharged into the atmosphere and air is supplied to the upper space in an emergency.

A bumper stopper is mounted at an end of the piston rod, and the bumper stopper is accommodated in the bellows to mitigate an impact due to contact between the piston rod and the bellows when the bellows is compressed.

On the other hand, the angle sensor includes a weight perpendicular to the ground, it is effective to detect the tilt angle of the vehicle body by detecting the additional tilt angle.

According to the present invention, when any one side of the vehicle equipped with the air spring is inclined greatly by the load, the air is injected into the bellows of the air spring to expand the bellows, but the balance of the vehicle is not achieved. It is to prevent the vehicle from overturning by lifting the vehicle body using the cylinder.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 and 4 is a block diagram of a vehicle rollover prevention device having an air spring according to the present invention. As shown in FIG. 3, the vehicle rollover prevention apparatus using the air spring is mounted on the vehicle body side at positions adjacent to both wheels, respectively, and includes a plurality of angle sensors 16 and angle sensors 16 for detecting the degree of inclination of the vehicle. A weight (pendulum 17) connected to the ground perpendicular to the ground in the direction of gravity, a vehicle body upward device for raising the vehicle body, and a degree of compression of the air spring and controlling the inclination of the vehicle based on the data received from the angle sensor 16; It is composed of the ECU 19 which is a control unit for determining the true state and operating the vehicle body upward device when the inclination angle of the vehicle body on both the left and right sides reaches the maximum safety inclination angle.

The air spring includes a support rod for supporting the vehicle body, a bellows 14 connected to the support rod and mounted on the wheel, a leveling valve (not shown) for supplying or sucking air to the bellows 14, and the bellows. It consists of an air tank 18 for storing the air supplied to the 14.

According to the present invention, the support rod is composed of a pneumatic cylinder 13 which functions as a vehicle body upward device. Although the bellows 14 is completely compressed by the load of the vehicle, the pneumatic cylinder 13 cannot be extended even with the conventional leveling valve, and thus the vehicle body is moved upward when the vehicle reaches the maximum safety tilt angle. It is designed to lift.

The pneumatic cylinder 13 is mechanically connected between the vehicle body and the bellows 14, but the cylinder casing constituting a closed space independent of the pressure, the piston rod (13a) accommodated in the cylinder casing, the piston The bumper stopper 12 connected to the rod 13a, and the stopper 13b which limits the movement of the piston rod 13a in a cylinder casing. On the other hand, the bellows 14 is accommodated in the stop plate 15 for mitigating the impact due to contact with the bumper stopper 12 when the bellows 14 shrinks.

The pneumatic cylinder 13 is operated by the first valve 20 and the second valve 21 which are connected to the air tank 18, the first valve 20 of the air tank 18 in the normal running state Supplying air to the lower space of the pneumatic cylinder 13 (dividing the lower space and the upper space based on the piston of the piston rod) and to discharge air from the lower space of the pneumatic cylinder 13 to the atmosphere during emergency operation Function At this time, the lower space of the pneumatic cylinder 13 is a closed space independent of the bellows 14 as described above, both of which are pressure-separated spaces in which air does not flow.
In contrast, the second valve 21 discharges air from the upper space of the pneumatic cylinder 13 to the atmosphere in a normal state and supplies air of the air tank 18 to the upper space of the pneumatic cylinder 13 in an emergency operation. .

When the angle sensor 16 is tilted in a horizontal state of the vehicle, the weight 17 receives gravity, so that the weight 17 is inclined with respect to the original initial position. This resistance value is calculated.

Since the weight 17 always maintains the gravity direction by the weight of the weight, when the vehicle is inclined, the weight 17 moves in the gravity direction, thereby changing the resistance value of the angle sensor 16 mounted on each vehicle body of the vehicle. The resistance value is provided to the ECU 19.

If any one of the left and right sides of the vehicle body is determined to be out of the maximum safety inclination angle, the ECU 19 supplies air pressure to the pneumatic cylinder 13 on the inclined wheel side and ascends, thereby raising the vehicle body to be horizontal.

Referring to the operation of the ECU 19 in detail, the ECU 19 receives the angle data of the vehicle according to the resistance value from the angle sensor 16. When the inclination angle of the vehicle reaches 35 degrees or more, which is the maximum safety tilt angle, the ECU 19 determines that the vehicle is in danger of overturning. Then, the ECU 19 determines whether it is left and right according to the resistance value received from the angle sensor 16, and then operates the pneumatic cylinder 13 by turning on and off the first valve 20 and the second valve 21. Let's do it.

The configuration in which the pneumatic cylinder 13 is operated in accordance with the opening and closing of the first valve 20 and the second valve 21 is as follows. In the pneumatic cylinder 13, the piston rod 13a and the cylinder casing are relatively operated by supplying and exhausting air by opening and closing the first valve 20 and the second valve 21. Usually, the first valve 20 is in a state in which air is supplied from the air tank 18 to the lower space of the cylinder 13, and the second valve 21 is in a state of discharging air into the atmosphere.

On the contrary, in the emergency state in which the inclination angle of the vehicle becomes 35 degrees or more, which is the maximum safety inclination angle, and the bumper stopper 12 at the lower end of the piston rod 13a contacts the stop plate 15, the first valve 20 The air in the lower space of the pneumatic cylinder 13 is switched to the state to be discharged into the atmosphere, and the second valve 21 is switched to the state in which air is supplied to the upper space of the pneumatic cylinder 13. As a result, the pneumatic cylinder 13 (exactly the cylinder casing) rises with respect to the piston rod 13a in which the bumper stopper 12 is in contact with the stop plate 15.
Since the vehicle body of the inclined portion is raised by the elevated pneumatic cylinder 13 to maintain the level of the vehicle body.
That is, only the pneumatic pressure applied in the bellows 14 does not lift the inclined vehicle body, but air pressure is applied to the pneumatic cylinder 13 added to the bellows 14, so that the pneumatic pressure applied to the bellows 14 is applied to the vehicle body. The combined force of the pneumatic pressure applied to the pneumatic cylinder 13 is to act, thereby raising the vehicle body.

By this configuration, the pneumatic cylinder is mounted on the air spring used in the air suspension system, and the inclination of either side of the vehicle is detected by the angle sensor, and when the inclination detected by the angle sensor reaches the maximum safety inclination angle, By operating the cylinder and lifting the vehicle body, it is possible to prevent overturning of the vehicle body.

As described above, according to the present invention, when the change in the behavior posture of a large vehicle equipped with the air spring reaches the maximum safety inclination angle (critical inclination angle), it is possible to prevent the vehicle body from tipping over.

Claims (5)

An air spring comprising a support rod mounted on the vehicle body side and a bellows mounted on the wheel side and connected to the support rod, and a leveling valve for controlling supply and discharge of air to the bellows of the air spring. In the air spring device, An angle sensor mounted on both side wheel adjacent portions of the vehicle body and detecting an inclination degree of the vehicle body; A pneumatic cylinder, an air tank, and the cylinder, which are formed of the support rod and mechanically connect the vehicle body and the bellows, and form a closed space pressure-independently from the bellows, and a piston rod moving in the cylinder casing. A vehicle body upward device comprising a pair of valves for controlling the inflow and outflow of air between the casing and the air tank; The control unit controls the leveling valve according to the height of the bellows, and drives the vehicle body upward device mounted on the inclined wheel side when at least one angle detected by the angle sensor reaches the maximum safety tilt angle of the vehicle. Vehicle overturning prevention device using an air spring, comprising a. delete The method of claim 1, One of the pair of valves supplies air to the piston lower space of the pneumatic cylinder in a normal driving state and discharges air from the lower space to the atmosphere in an emergency, The other valve is a vehicle overturn prevention device using an air spring, characterized in that to discharge the air in the upper space of the piston of the pneumatic cylinder in the normal running state to the air and to supply the air to the upper space in case of emergency. The method of claim 1, The angle sensor includes a weight perpendicular to the ground, the vehicle rollover prevention device using an air spring, characterized in that for detecting the inclination angle of the vehicle body by detecting the additional inclination angle. The method of claim 1, A bumper stopper is mounted at an end of the piston rod, and the bumper stopper is accommodated in the bellows.

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