KR101070660B1 - Hybrid air suspension able to easily adjust height of vehicle - Google Patents

Abstract

The present invention relates to a hybrid air suspension that is easy to adjust the height, an air spring that connects between the vehicle body and the wheel, and adjusts the buffer and the height of the vehicle by the flow in and out of the air, the inlet or outflow of air to the air spring The multi-function leveling valve, a link unit for transmitting the height change of the vehicle body to the multi-function leveling valve, a valve drive unit for controlling the air inlet or outlet of the multi-function leveling valve, a suspension control unit for controlling the adjustment operation of the valve drive unit, the multifunction leveling valve By adjusting the air inflow or outflow to the air spring part in response to the change in the height transmitted from the link, not only can the control reliability be improved, but also the height can be adjusted while the vehicle is running, thereby improving the passenger comfort and driving stability. It is easy to apply various convenient modes.

Hybrid, Air Spring, Suspension, Leveling Valve, Valve Body, Spool

Description

Hybrid air suspension able to easily adjust height of vehicle}

The present invention relates to a hybrid air suspension that is easy to adjust the height, and more particularly, by allowing the height of the vehicle body to be quickly adjusted according to the driving state of the vehicle, the ride to improve the ride comfort and to improve the steering safety A hybrid air suspension is easy to adjust.

Suspensions installed in automobiles improve driving comfort by absorbing shocks transmitted from the road surface, or increase tire traction by controlling irregular movement of wheels when driving on uneven roads. To be delivered to.

The basic elements of such a suspension include a shock absorber and a spring mounted between the vehicle body and the wheel. The spring maintains the garage and supports the weight of the vehicle to mitigate the impact the vehicle receives from the ground. The shock absorber damps the up and down reciprocation of the spring so that the tire is always in close contact with the ground. On the other hand, the wheel constitutes the wheel together with the tire.

Here, the suspension using the air spring portion instead of the spring is called an air suspension.

The air suspension includes an air spring portion, an air supply system for supplying air to the air spring portion, and a valve for introducing or discharging air from the air supply system to the air spring portion.

The air suspension may be divided into a mechanical air suspension and an electronic air suspension according to a method of flowing air in and out of the air spring.

In the case of the mechanical air suspension, a lever is connected between the wheel and the leveling valve, and the lever turns the leveling valve on and off according to the change of the vehicle body. Accordingly, air from the air supply system flows into the air spring portion, or air from the air spring portion flows out.

On the other hand, the electronic air suspension receives a signal from various sensors attached to the vehicle body, for example, a vehicle speed sensor, a garage sensor, a steering wheel angular velocity sensor, and the like to operate the solenoid valve. Accordingly, air from the air supply system flows into the air spring portion, or air from the air spring portion flows out.

However, these mechanical air suspensions and electronic air suspensions have the following advantages and disadvantages, respectively.

In the case of a mechanical air suspension, it reacts immediately according to the movement of the vehicle body and flows in and out the air of the air spring, and has high reliability due to the characteristics of mechanical control. However, in the case of the mechanical air suspension, since the garage is set in advance, the garage cannot be adjusted while driving, and only the horizontal leveling of the garage is possible.

On the other hand, in the case of the electronic air suspension, the height can be adjusted while driving by the electronic control, it is easy to adopt various convenient modes. However, due to the characteristics of the electronic control, the reliability is low, and the operation is stopped above a certain limit condition. For example, when the constant angular velocity is over, the operation of the control is stopped or the operation of the control is stopped by the EMI.

Accordingly, there is a need for the development of a suspension that combines the convenience of mechanical control and electronic control to have high reliability, easy adjustment of the vehicle height while driving, and easy adoption of various convenient modes.

Accordingly, an object of the present invention is to provide a hybrid air suspension that is highly reliable, easy to adjust the height while driving, and easy to adjust the height to facilitate the adoption of various convenient modes.

The configuration of the present invention for achieving this object, the air spring portion is installed adjacent to the wheel to cushion the action by the inflow and outflow of air; A multifunctional leveling valve for introducing or discharging air into the air spring part and adjusting the height of the vehicle body by moving in a direction approaching or spaced apart from the vehicle body; A valve driver for moving the multi-function leveling valve in a direction approaching or spaced apart from a vehicle body; And a suspension controller for controlling the operation of the valve driver in response to a signal from the outside.

The multi-function leveling valve, the valve body for flowing air into or out of the air spring portion; And a fixing member disposed adjacent to the valve body to fix the valve body to the vehicle body to be movable.

The valve drive unit, the drive motor is installed in the fixed member capable of forward and backward driving; A pinion installed on the shaft of the drive motor; It may include; a rack installed to engage with the pinion on one outer wall of the valve body.

And at least one sensor installed in the vehicle body to sense at least one of a speed, a height, and a direction of the vehicle body, wherein the suspension controller is configured to perform forward and reverse driving of the driving motor according to a detection result from the sensor. Can be controlled.

The suspension controller may control forward and reverse driving of the driving motor in accordance with the selection of the occupant through the user interface unit.

The valve body is provided with an air inflow pipe communicating with the air spring, an inflow pipe communicating with an air tank for supplying air to the air spring, and an outflow pipe connected with the outside air; In the valve body, a spool for communicating the air outflow pipe with the inflow pipe or the outflow pipe may be mounted to enable linear movement.

The spool is connected to the axle by a lever and a link, and may move in the valve body according to the height variation of the vehicle body to supply or discharge air to the air spring part.

When the height of the vehicle body increases, the spool may move upward in the valve body, and the air outlet pipe and the outlet pipe may be connected to discharge air from the air spring into the air.

When the height of the vehicle body is lowered, the spool may move downward in the valve body, and the air outlet pipe and the inlet pipe may be connected to allow air from the air tank to flow into the air spring part.

When the height of the vehicle body is lowered, the suspension control unit drives the drive motor to move the valve body upward, and when the height of the vehicle body increases, the suspension controller drives the drive motor to move the valve body downward. You can.

When the valve body moves upward, the air outlet pipe and the inlet pipe are connected, so that air from the air tank flows into the air spring portion, and when the valve body moves downward, the air outlet pipe and the outlet pipe Connected, air from the air spring portion may be discharged into the air.

As described above, according to the present invention, by controlling the air inflow and outflow of the air spring portion during the driving of the vehicle, and electronically controlled, not only can the control reliability be improved, but also the height can be adjusted while the vehicle is running. Therefore, the ride comfort and running stability of the occupant can be improved, and various convenient modes can be easily applied.

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

1 is a block diagram of a vehicle having a hybrid air suspension according to an embodiment of the present invention.

The hybrid air suspension includes an air spring unit 50, a multifunctional leveling valve 30, a valve drive unit 40, an air supply system 20, a suspension control unit 10 (HASCU: Hybrid Air Suspension Control Unit), and a link unit. (60). The hybrid air suspension can mechanically level the vehicle body in response to a change in height of the vehicle during driving, and at the same time, the garage can be adjusted electronically according to a signal input from the sensor unit 7 or the occupant.

In FIG. 1, a schematic configuration of a vehicle having the hybrid air suspension is illustrated. In addition to the hybrid air suspension, the vehicle further includes a user interface unit 5 and a sensor unit 7.

The user interface unit 5 is for the passenger including the driver to select various convenient modes or to display the driving state according to the result detected by the sensor unit 7. The user interface 5 may be provided in various forms, may be provided as an LCD display device that can input and output information, or may be provided using a plurality of input buttons or rotary switches.

The user interface unit 5 according to an embodiment of the present invention is provided with an operation button or an input screen for adjusting the height of the vehicle body. For example, the user interface unit 5 is provided with a button or an input screen for selecting the off-road mode to raise the garage when driving on a dirt road.

The sensor unit 7 includes a height sensor, a vehicle speed sensor, a steering wheel angular velocity sensor, a throttle position sensor, a gravity sensor, or the like. The garage sensor is installed at two rear wheels and one front wheel of the vehicle to detect the position of the body 1 and the axle. The vehicle speed sensor detects the driving speed of the vehicle, and the steering wheel angular velocity sensor is installed on the steering shaft to detect the operating speed of the steering wheel to generate a cornering signal. The throttle position sensor detects a sudden deceleration or a rapid acceleration state, and the gravity sensor measures the bounce of the vehicle body 1 to determine the unevenness of the road surface.

Among the sensors included in the sensor unit 7, the vehicle speed sensor may use a three-axis acceleration sensor that can measure the acceleration in the vertical direction, left and right, front and rear direction of the vehicle.

Hereinafter, the configuration of the hybrid air suspension will be described.

The air spring 50 of the hybrid air suspension adjusts the vehicle's height by inflowing or outflowing air, and is installed at each shock absorber adjacent to each front wheel and the rear wheel. That is, four air springs 50 are installed in one vehicle.

The air supply system 20 supplies air introduced into the air spring unit 50, compresses the air, an air tank storing the compressed air, and supplies air to each air spring unit 50. Include plumbing for supply. Here, the compressor compresses the air according to the operation control from the suspension control unit 10 and provides the air to the air tank. The piping is connected to the multifunctional leveling valve 30, through which air from the air tank is provided to the multifunctional leveling valve 30. This air supply system 20 is not shown in the drawings because it is a configuration well known to those skilled in the art.

2a to 2c show the configuration of the multi-function leveling valve according to an embodiment of the present invention. 2A to 2C, the multifunctional leveling valve may be configured as, for example, a valve body 231, and may be configured in a general shape.

The multifunctional leveling valve includes an air spring 50, an air outlet pipe 234 through which air flows in, an air supply system 20, an inlet pipe 232b through which air flows in, and an outlet pipe 232a.

Here, the air inlet pipe 234 may be connected to the air inlet pipe 232b or the air outlet pipe 232a according to the vertical movement of the spool 235. When the air inlet pipe 234 is connected to the air inlet pipe 232b to supply air to the air spring unit 50, when connected to the air outlet pipe 232a to remove the air from the air spring unit 50 To me.

FIG. 2A illustrates a state in which the air outlet pipe 234, the air outlet pipe 232a, and the air inlet pipe 232b are not connected to each other so that air is not removed or supplied from the air spring 50. As the air spool 235 and the air inlet pipe 232b are connected by the lowering of the spool 235, the air is supplied to the air spring unit 50, and FIG. 2C shows the rising of the spool 235. By this, the air inflow pipe 234 and the air outflow pipe 232a are connected, and each state which removes air from the air spring part 50 is shown.

In addition, the air outflow pipe 234 here is connected to the air inflow pipe 232b not only by the vertical movement of the spool 235 but also by the vertical movement of the valve body 231 as described above. 232a). When the air inlet pipe 234 is connected to the air inlet pipe 232b to supply air to the air spring unit 50, when connected to the air outlet pipe 232a to remove the air from the air spring unit 50 To me.

FIG. 2A illustrates a state in which the air outlet pipe 234, the air outlet pipe 232a, and the air inlet pipe 232b are not connected to each other so that air is not removed or supplied from the air spring 50. The air outlet inlet pipe 234 and the air inlet pipe 232b are connected to each other by the rising of the valve body 231 to show a state in which the air is supplied to the air spring unit 50, and FIG. 2C is a view of the valve body 231. The air outflow pipe 234 and the air outflow pipe 232a are connected by the lowering, and each state shows the removal of air from the air spring part 50.

As shown in FIG. 3, the multifunction leveling valve 30 is disposed adjacent to the valve body 31 and the valve body 31 for introducing or discharging air into the air spring unit 50 and the valve body 31. ) Is fixed to the vehicle body (1) to include a fixing member (33).

The valve body 31 is formed to be generally long on one side, and openings for inflow and outflow of air are formed on both sides of the long side along the longitudinal direction. Here, the one side side toward the air spring unit 50 is connected to the air spring unit 50 to inlet air into the air spring unit 50 or to discharge air from the air spring unit 50 to the air outlet pipe 34 ) Is formed, and on the other side, an inflow pipe 32b connected to the pipe of the air supply system 20 and an outflow pipe 32a connected to the outside air are formed. The inlet pipe 32b and the outlet pipe 32a are formed to be spaced apart by a predetermined width, and the air outlet pipe 34 is formed at a position corresponding between the inlet pipe 32b and the outlet pipe 32a.

The spool 35 is provided inside the valve body 31, and the air outflow and inflow pipe 34 communicates with the inflow pipe 32b or the outflow pipe 32a as the spool 35 moves. When the spool 35 moves upward, the air outlet pipe 34 and the outlet pipe 32a are connected. When the spool 35 moves downward, the air outlet pipe 34 and the inlet pipe 32b are connected. do.

At this time, when the air outlet pipe 34 communicates with the inlet pipe 32b, the high pressure air from the air tank flows into the valve body 31 through the inlet pipe 32b, and the air in the valve body 31 It enters the air spring part 50 through the air outflow pipe 34. When the air outflow pipe 34 communicates with the outflow pipe 32a, the air from the air spring 50 flows out into the valve body 31 through the air outflow pipe 34, and the air in the valve body 31. Is discharged to the outside through the outlet pipe (32a).

On the other hand, one end of the spool 35 extends to the outside of the valve body 31 and is connected to the axle adjacent to the lower end of the air spring part 50 by the link part 60.

Link portion 60 according to an embodiment of the present invention includes a lever 68 and a link 69, the lever 68 is connected to one end of the spool 35, the link 69 is connected to the axle The lever 68 and the link 69 are interconnected. The rack 36 is formed at one end of the spool 35 along the longitudinal direction of the spool 35, and the pinion 37 engaged with the rack 36 at one end of the lever 68 toward the spool 35. ) Is installed.

Accordingly, in response to the vertical movement of the vehicle body 1, the link 69 moves the lever 68 up and down due to the width change between the vehicle body 1 and the wheel, and the pinion 37 of the lever 68. ) Moves the spool 35 while moving the rack 36 engaged with the pinion 37 up and down. That is, the spool 35 moves immediately in response to the height change of the vehicle body 1 to supply air to the air spring unit 50 or to let air out of the air spring unit 50.

The multi-function leveling valve 30 immediately adjusts the height of the vehicle body 1 when the height of the vehicle body 1 is changed by the operation of the spool 35, in which the multi-function leveling valve 30 It operates so that the distance with the vehicle body 1 is the same, that is, the height of the vehicle body 1 becomes constant with respect to the ground.

The fixing member 33 is disposed between the vehicle body 1 and the valve body 31 to fix the valve body 31 to the vehicle body 1, and at the same time, the valve body 31 is moved up and down with respect to the vehicle body 1. To be moved.

For this purpose, the valve member 40 for driving the valve body 31 forward and backward is provided in the fixing member 33 and the valve body 31. The valve drive unit 40 includes a drive motor (not shown) installed in the fixing member 33 and capable of driving forward and backward, a pinion 41 provided on the shaft of the driving motor (not shown) to the outside of the fixing member 33. And a rack 43 provided to engage the pinion 41 on one outer wall of the valve body 31. Here, of course, other means than the rack 43 and the pinion 41 can be used for driving the valve body 31.

The forward and reverse drive motor (not shown) may move the valve body 31 in the forward or reverse direction by forward or reverse rotation, and a servo motor may be used as the forward and reverse drive motor (not shown).

According to this configuration, when the pinion 41 rotates during the operation of the stationary drive motor (not shown), the valve body 31 moves up and down by the rack 43. Thus, when the valve body 31 moves up and down, it has the same effect as the spool 35 moves.

That is, when the valve body 31 moves upward, the spool 35 moves relatively downward in the valve body 31 (FIG. 2B state), and when the valve body 31 moves downward, the valve In the sieve 31, the spool 35 is moved upwards relatively (FIG. 2C state).

Accordingly, when the valve body 31 moves downward, that is, when the spool 35 moves upward, the air inlet and outlet pipe 34 and the outlet pipe 32a are connected (FIG. 2C), and the valve body is upward. When moving to, i.e., when the spool 35 moves relatively downward, the air outlet pipe 34 and the inlet pipe 32b are connected (FIG. 2B).

In other words, when the valve body 31 moves upward, the spool 35 moves relatively downward, and the air outlet and inlet pipe 34 and the inlet pipe 32b are connected, so that air is introduced into the air spring 50. It is supplied and the vehicle body 1 will become high. On the other hand, when the valve body 31 moves downward, the spool 35 moves upward, and the air outflow pipe 34 and the outflow pipe 32a are connected, so that air flows out of the air spring 50. As a result, the vehicle body 1 is lowered.

Although not shown in the figure, the air outlet pipe 34 and the outlet pipe 32a are connected to the valve body 31 when the spool 35 moves upward, and the air outlet when the spool 35 moves downward. The physical structure necessary for connecting the inlet pipe 34 and the inlet pipe 32b may be provided. In addition, the air outlet pipe 34 and the air spring unit 50 may be connected through a flexible cable.

The suspension control unit 10 can move the valve body 31 of the multifunctional leveling valve 30 up and down according to the signal input from the sensor unit 7 and the signal input from the user interface unit 5. The operation of the valve drive unit 40 is controlled.

That is, the movement of the spool 35 up and down is mechanically operated by the height change of the garage, whereas the movement of the valve body 31 up and down is caused by the operation of the valve driver 40 under the control of the suspension control unit 10. It works.

Accordingly, when there is a difference in the height of the vehicle, the height of the vehicle body 1 is balanced by the vertical movement of the spool 35, and when the height of the vehicle body 1 is artificially increased or decreased, the valve body 31 You can adjust the height by moving the up and down.

That is, if the valve body 31 is artificially moved upward, the garage height becomes high regardless of whether the spool 35 is moved up and down, and if the valve body 31 is artificially moved downward, the spool 35 is moved up and down. Regardless, the garage will be lowered. This is because the vertical movement range of the spool 35 is limited, while the vertical movement range of the valve body 31 is wider than the vertical movement range of the spool. Accordingly, it is possible to artificially adjust the garage by the operation of the valve body 31 regardless of whether the spool 35 is moved.

Hereinafter, the method of artificially raising or lowering the valve body 31 is demonstrated.

First, a case in which the suspension control unit 10 operates according to a signal input from the sensor unit 7 is as follows.

For example, when driving a corner, the steering wheel angular velocity sensor detects the operating speed of the steering wheel to generate a cornering signal. At this time, the vehicle is inclined to the right at the left corner, and the suspension control unit 10 raises the vehicle body 1 on the right side or lowers the vehicle body 1 on the left side, or raises the vehicle body 1 on the right side and The valve driver 40 is operated to lower the vehicle body 1.

When raising the vehicle body 1 on the right side, the suspension control unit 10 rotates the forward and reverse drive motors (not shown) of the valve drive unit 40 adjacent to the front and rear wheels on the right side. Accordingly, when the valve body 31 moves upward, the spool 35 moves downward, and the air outlet pipe 34 and the inlet pipe 32b are connected, so that the air springs 50 of the right front wheel and the rear wheel 50 are connected. Air flows in to) and the vehicle body 1 on the right side rises.

When lowering the vehicle body 1 on the left side, the suspension control unit 10 rotates the forward and reverse drive motors (not shown) of the valve drive unit 40 adjacent to the front and rear wheels on the left side. Accordingly, when the valve body 31 moves downward, the spool 35 moves upward, and the air outlet pipe 34 and the outlet pipe 32a are connected to each other. Air flows out and the vehicle body 1 on the left side descends.

For example, when the vehicle is suddenly braked, the vehicle may lower or increase the vehicle body 1 of the front wheel portion, and the suspension control unit 10 receives a signal from the throttle position sensor and detects it. Then, the suspension control unit 10 may be configured such that the vehicle body 1 of the front wheel portion is made high or the vehicle body 1 of the rear wheel portion is made low, or the vehicle body 1 of the front wheel portion is made high, and the vehicle body 1 of the rear wheel portion is made low. A signal for operating the valve driver 40 is generated. In this case, the suspension controller 10 may control the height of the front wheel portion to be higher than the height of the rear wheel portion.

When the suspension control unit 10 raises the vehicle body 1 of the front wheel portion, the valve drive unit 40 adjacent to the front wheel drives the forward and reverse drive motor (not shown) so that the valve body 31 moves upward. Then, when the valve body 31 moves upward, the spool 35 moves downward, and the air outflow pipe 34 and the inflow pipe 32b are connected, so that air flows into the air spring 50 and the front wheels. The body 1 of the portion rises.

On the other hand, when the suspension control unit 10 lowers the vehicle body 1 of the rear wheel portion, the valve drive unit 40 installed adjacent to each rear wheel drives the forward and reverse drive motor (not shown) so that the valve body 31 moves downward. Let's do it. Then, when the valve body 31 moves to the lower side, the spool 35 moves upward, and the air outflow pipe 34 and the outflow pipe 32a are connected, so that air flows out of the air spring part 50 so that the rear wheel The vehicle body 1 of the part is lowered.

When the vehicle suddenly brakes in this way, the suspension control unit 10 may adjust the height of the vehicle body 1 at each time of sudden braking, or may adjust the height of the vehicle body 1 only when the speed before the sudden braking is higher than or equal to a certain level. In addition, depending on the selection, during the sudden stop, the height of the vehicle body 1 may not be adjusted by the suspension control unit 10.

The suspension controller 10 may change the height of the vehicle body 1 according to the speed of the vehicle detected by the vehicle speed sensor. When the speed of the vehicle sensed by the vehicle speed sensor is equal to or less than a predetermined schedule, for example, 50 km / h, the suspension control unit 10 may operate the valve driver 40 to raise the vehicle body 1. When the speed of the vehicle sensed by the vehicle speed sensor is greater than or equal to a preset time, for example, 80 km / h, the suspension controller 10 may operate the valve driver 40 to lower the vehicle body 1.

Meanwhile, the case in which the suspension control unit 10 operates according to the signal input from the user interface unit 5 will be described below.

When the user selects the off-road mode indicating the unpaved road through the user interface unit 5, the suspension control unit 10 operates the valve drive unit 40 to raise the vehicle body 1. That is, when the valve drive unit 40 is operated so that the valve body 31 moves upward, the spool 35 moves downward, and the air outflow pipe 34 and the inflow pipe 32b are connected to each other. Air is supplied into 50 so that the vehicle body 1 becomes high.

The operation process of the hybrid air suspension having such a configuration will be described with reference to FIGS. 4 to 6 by classifying into cornering and sudden braking.

When the vehicle travels a corner, as shown in Figs. 4 and 5, the vehicle body 1 is inclined in the opposite direction of the length .. For example, when the length is left to the driving direction, the vehicle body 1 is inclined to the right, and in the case of the air spring 50 mounted adjacent to the right front wheel and the rear wheel, the link 69 and the lever 68 Since the spool 35 is moved downward by the bottom and the air outlet pipe 34 and the inlet pipe 32b are connected, air is introduced into the air spring 50 so that the right part of the vehicle body 1 rises. . As a result, the vehicle body 1 is parallel to the left side and the right side.

However, the driver feels a sense of stability when the vehicle body 1 is inclined to the left at the left corner. Accordingly, when the suspension control unit 10 receives the cornering signal from the steering wheel angular velocity sensor, the suspension control unit 10 injects air into the air springs 50 mounted on the right front wheel and the rear wheel to tilt the vehicle body 1 to the left. The vehicle body 1 is raised or the air is discharged from the air springs 50 mounted on the left front wheel and the rear wheel to lower the vehicle body 1. Alternatively, the right body rise and the left body descend may be simultaneously performed.

 Here, whether to raise the right body 1 or to lower the left body 1 or to simultaneously raise and lower the right body can be determined by the speed of the vehicle.

In order to lower the left vehicle body 1, the suspension control unit 10 rotates the forward and reverse drive motors (not shown) of the valve drive unit 40 adjacent to the left front wheel and the rear wheel. Accordingly, when the valve body 31 moves downward, the spool 35 moves upward, and the air outlet pipe 34 and the outlet pipe 32a are connected to each other. Air flows out and the vehicle body 1 on the left side descends.

When raising the vehicle body 1 on the right side, the suspension control unit 10 rotates the forward and reverse drive motors (not shown) of the valve drive unit 40 adjacent to the front and rear wheels on the right side. Accordingly, when the valve body 31 moves upward, the spool 35 moves downward, and the air outlet pipe 34 and the inlet pipe 32b are connected, so that the air springs 50 of the right front wheel and the rear wheel 50 are connected. Air flows in to) and the vehicle body 1 on the right side rises.

While the vehicle is running, the suspension control unit 10 provides a driving signal of a forward and backward drive motor (not shown) to each valve driver 40 according to the speed of the vehicle input from the speed sensor. That is, the suspension control unit 10 provides the drive signal of the forward and reverse drive motor (not shown) so that the valve body 31 moves downward when the speed is above a certain level, whereby the air outlet pipe 34 and the outlet pipe 32a. ) To communicate with the air to flow out of the air spring (50). As a result, the height of the vehicle body 1 is lowered.

On the contrary, the suspension control unit 10 provides a driving signal to each forward / reverse drive motor (not shown) so that the valve body 31 moves upward when the speed of the vehicle becomes lower than a predetermined speed, thereby inducing the air inlet and outlet pipe 34. The pipe 32b communicates and air is supplied to the air spring part 50. As a result, the height of the vehicle body 1 is increased.

On the other hand, when driving on the unpaved road, the suspension control unit 10 determines that the off-road in accordance with the signal from the gravity sensor, the forward and reverse drive motor (not shown) of each valve drive unit 40 so that the valve body 31 moves upward To provide the driving signal. As a result, when the valve body 31 moves upward, the air outlet pipe 34 and the inlet pipe 32b communicate with each other, thereby supplying air to the air spring unit 50, and the height of the vehicle body 1 is increased. .

When the vehicle suddenly brakes, as shown in FIG. 6, the vehicle body 1 is tilted forward. At this time, when the vehicle body 1 is tilted forward, the occupant's body is also tilted forward, so that the ride comfort is reduced. Accordingly, it is necessary to prevent the vehicle body 1 from tilting forward.

First, when the vehicle body 1 tilts forward, the link 69 connected adjacent to the wheel moves upward, and the spool 35 moves downward by the lever 68. Then, the air outflow pipe 34 and the inflow pipe 32b communicate with each other, the high pressure air from the air tank flows into the valve body 31 through the inflow pipe 32b, and the air in the valve body 31 It enters the air spring part 50 through the air outflow pipe 34. As a result, the front of the vehicle body 1 is raised to the same level as the rear of the vehicle body 1.

At the same time, when the vehicle body 1 tilts forward, the suspension control unit 10 receives a signal from the throttle position sensor and detects it. The suspension controller 10 then raises the front of the vehicle body 1, or lowers the rear of the vehicle body 1, or simultaneously moves the front body of the vehicle body 1 and the rear body lower of the vehicle body 1 simultaneously. Generates a signal.

When raising the front of the vehicle body 1, the suspension control unit 10 drives the forward and reverse drive motor (not shown) so that the valve drive unit 40 adjacent to the front wheel moves the valve body 31 upward. Then, since the valve body 31 moves upward, the spool 35 moves downward, and the air outlet pipe 34 and the inlet pipe 32b are connected, air is introduced into the air spring part 50 so that the front wheel The body 1 of the portion rises.

When the rear of the vehicle body 1 is lowered, the suspension control unit 10 drives the forward and reverse drive motor (not shown) so that the valve driving unit 40 adjacent to the rear wheel moves the valve body 31 downward. Then, the valve body 31 moves downward, the spool 35 moves upward, and the air outlet pipe 34 and the outlet pipe 32a are connected, so that the air flows out of the air spring part 50 so that the vehicle body of the rear wheel part is moved. (1) descends.

As a result, air is supplied to the air spring portion 50 to the front wheels and / or flows out to the air spring portion 50 to the rear wheels, so that the front of the vehicle body 1 and the rear of the vehicle body 1 are at the same level. Since air is supplied again in the raised state, the front of the vehicle body 1 becomes higher than the rear of the vehicle body 1. At this time, the degree of raising the front of the vehicle body 1 is determined according to the speed before rapid braking. That is, the higher the speed before braking, the larger the height of the front of the vehicle body 1 is increased.

In this way, when the front of the vehicle body 1 is operated to be higher than the rear of the vehicle body 1, the vehicle body 1 that has been inclined forward can be kept parallel in a faster time, and thus the riding comfort can be improved.

Thus, according to this hybrid air suspension, the air inflow and outflow to the air spring part 50 is adjusted by mechanically operating the spool 35 of the multifunctional leveling valve 30 according to the height change of the vehicle body 1. Thereby, by making the overall height level of the vehicle body 1 immediately match with the height change of the vehicle body 1, the reliability of the multifunctional leveling valve 30 can be improved.

In addition, by moving the valve body 31 itself of the multi-function leveling valve 30 in response to a sensor or a passenger's signal, the vehicle body 1 is not adaptively leveled, but more adaptively depending on the running state. The height of 1) can be adjusted in whole or in part. Accordingly, by allowing the height of the vehicle body 1 to be adjusted even during driving by electronic control, it is possible to more effectively correct the inclination or shaking of the vehicle caused by the state of the road, the speed of the vehicle, or the like. In addition, it is easy to apply various convenient modes according to the electronic control.

In the detailed description of the present invention, specific embodiments have been described, but it should be taken as exemplary, and various modifications may be made without departing from the technical spirit of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below, but also by the equivalents of the claims.

1 is a block diagram of a vehicle having a hybrid air suspension according to an embodiment of the present invention;

2a to 2c is a configuration diagram showing the operation of the multi-function leveling valve of the present invention,

3 is a detailed configuration diagram of the air spring and the multi-function leveling valve in the hybrid air suspension of FIG.

Figure 4 is a rear view of the vehicle showing the height change of the vehicle when the vehicle travels the corner,

5 is a view for explaining the operation of the hybrid air suspension when cornering of FIG.

6 is a side view of the vehicle showing the height change of the vehicle during rapid braking and sudden start of the vehicle.

Explanation of symbols on the main parts of the drawings

 1: body 10: suspension control unit

20: air supply system 30: multi-function leveling valve

31 valve body 33 fixing member

35: spool 40: valve drive part

50: air spring portion 60: link portion

Claims (7)

An air spring unit which connects between the vehicle body and the wheel and controls the buffer and the height of the vehicle body by the inflow and outflow of air; A multifunctional leveling valve for introducing or discharging air into the air spring unit; A link unit for transmitting a height change of the vehicle body to the multifunctional leveling valve; A valve driver for controlling air inflow or outflow of the multifunction leveling valve; And, And a suspension controller for controlling an adjustment operation of the valve driver. The multifunctional leveling valve, A valve body including an inlet pipe for introducing air into the air spring part through an air outlet pipe and an outlet pipe for outflowing air from the air spring part; A fixing member disposed adjacent to the valve body and fixed to the vehicle body to move the valve body; And Shanghai in response to the change in the garage delivered from the link portion, by moving the inlet pipe and the outlet pipe up and down by the shanghai dong, so that the one of the inlet pipe and the outlet pipe and the air inlet pipe Hybrid air suspension easy to adjust the height, characterized in that it comprises a spool. The method of claim 1, The link unit mechanically transfers the garage change to the multifunction leveling valve, The multi-functional leveling valve is a hybrid air suspension easy to adjust the height, characterized in that the mechanical in response to the change in the garage inflow or outflow. The method of claim 1, The suspension control unit electronically controls the valve drive unit, The valve drive unit is easy to adjust the height of the hybrid air suspension characterized in that the mechanical adjustment of the air inlet or outlet operation of the multi-function leveling valve. delete The method of claim 1, The valve driving unit, A drive motor installed in the fixed member and capable of forward and reverse driving; A pinion installed on the shaft of the drive motor; And a rack installed to engage the pinion on an outer wall of one side of the valve body. The method of claim 5, And at least one sensor installed in the vehicle body to sense at least one of a speed, a height, and a direction of the vehicle body. The suspension control unit is easy to adjust the height, characterized in that for controlling the forward and reverse drive of the drive motor according to the detection result from the sensor. The method of claim 6, The suspension control unit is a hybrid air suspension easy to adjust the height, characterized in that for controlling the forward and reverse drive of the drive motor according to the selection of the occupant through the user interface.

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