KR101339218B1 - Apparatus for controlling height of vehicle - Google Patents

Abstract

Provided is a vehicle height control apparatus that can adjust the height of the vehicle as needed by adjusting the lever ratio by improving some of the components provided in the suspension of the vehicle. The garage control device of the vehicle is provided with a knuckle on which wheels are mounted, a lower arm connecting the knuckle and the vehicle body from the lower side, an upper arm connecting the knuckle and the vehicle body, and a vehicle between the lower arm and the vehicle body. The vehicle is interposed in the garage direction and is driven as an external force is supplied, and includes a garage adjustment unit for adjusting the vehicle's height. As the garage control unit is driven, the lever ratio between the lower arm and the body is adjusted to adjust the vehicle's height.

Vehicle, garage, control, lever ratio

Description

Garage control device of vehicle {APPARATUS FOR CONTROLLING HEIGHT OF VEHICLE}

The present invention relates to a control apparatus of a vehicle, and more particularly to a vehicle height control apparatus of a vehicle.

In general, the suspension of the vehicle is a device that connects the axle and the vehicle body so as not to directly transmit the vibration or shock received from the road surface to the vehicle body while the vehicle is running. The suspension system absorbs vibrations or shocks transmitted from the road surface, thereby preventing damage to the vehicle body and improving riding comfort, thereby enabling comfortable driving.

On the other hand, the vehicle needs to adjust the height of the vehicle to prevent damage to the vehicle body due to the road surface. For example, if the road on which the vehicle is driven is an uneven road, the garage needs to be increased, and when driving on a flat road such as a highway, the garage needs to be lowered to reduce air resistance.

By improving a part of the components provided in the suspension of the vehicle by adjusting the lever ratio to provide a vehicle height control device that can adjust the height of the vehicle as needed.

The garage control device of the vehicle is provided with a knuckle on which wheels are mounted, a lower arm connecting the knuckle and the vehicle body from the lower side, an upper arm connecting the knuckle and the vehicle body, and a vehicle between the lower arm and the vehicle body. The vehicle is interposed in the garage direction and is driven as an external force is supplied, and includes a garage adjustment unit for adjusting the vehicle's height. As the garage control unit is driven, the lever ratio between the lower arm and the body is adjusted to adjust the vehicle's height.

The garage adjustment part is the upper side is disposed on the vehicle body side to maintain a rotatable state, the lower side is a first member formed to be inclined with a predetermined inclination, the lower side is disposed on the lower arm side to maintain a rotatable state, the upper side is the first member The second member is formed to be inclined with a predetermined slope corresponding to the lower side of the, and is interposed between the first member and the second member is pressed or restored in accordance with the transmission of the external force, interlocked with the rotation of the first member and the second member It may include an elastic member.

The first member extends in the longitudinal direction from the inclined portion having the inclined surface inclined at a predetermined angle, the inclined portion in the longitudinal direction, the projection portion is fitted into the elastic member, and extends in the longitudinal direction on both sides of the inclined portion, the mounting state of the elastic member It may include a locking portion for supporting.

The elastic member may be made of a compression coil spring.

The lever ratio may consist of a / b.

Here, a is the distance from the connection point of the body and the lower arm to the intersection point where the center line in the load (F) direction of the elastic member meets the lower arm, and b is the connection point between the body and the lower arm to the connection point of the knuckle and the lower arm. Means the distance.

The second member may be formed in the same shape as the first member.

A first rotating member interposed between the first member and the vehicle body and coupled to the first member to make the first member rotatable from the vehicle body, the gear member transmitting the rotational force to the first member as the external force is transmitted; It may further include a second rotating member interposed between the second member and the lower arm to make the second member rotatable from the lower arm.

The gear member may be composed of a pinion gear coupled to the outer surface of the first member.

The control unit may further include a rack gear meshing with the pinion gear, a driving unit for supplying driving force to the rack gear, and a control operation for adjusting a vehicle height by supplying a driving control signal corresponding to the driving unit.

And a garage sensor for detecting a garage of the vehicle and generating a corresponding garage signal. The controller analyzes the garage signal input from the garage sensor and compares it with a preset garage value. The first driving control signal may be supplied to control a height of the vehicle, and if the vehicle height is high, the second driving control signal may be supplied to the driver to lower the height of the vehicle.

The vehicle's garage control device adjusts the lever ratio so that when the vehicle is going straight, the vehicle's garage is set low to secure the straight stability, and when the vehicle's garage needs to be kept high, the vehicle's garage can be adjusted high.

In addition, if necessary, such as when turning the vehicle, it is also possible to increase the turning stability by adjusting the left and right of the vehicle differently.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described below. In the specification and drawings, the same reference numerals denote the same elements.

1 is a schematic diagram showing a vehicle height control apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a vehicle height control apparatus according to an exemplary embodiment of the present invention includes a knuckle 10, a lower arm 12, an upper arm 14, a garage adjustment unit 20, a driver 30, and a controller ( 40), the lever ratio between the lower arm 12 and the vehicle body 4 is adjusted as the height adjustment unit 20 is driven to adjust the height of the vehicle.

The lever ratio according to the embodiment of the present invention is made of a / b. Here, a is the distance from the connection point of the vehicle body 4 and the lower arm 12 to the intersection where the center line in the load (F) direction of the elastic member 26 meets the lower arm 12, and b is the vehicle body 4 The distance from the connection point of the lower arm 12 to the connection point of the knuckle 10 and the lower arm 12.

The knuckle 10 is a portion on which the wheel 2 is mounted, as shown in FIG.

The lower arm 12 connects the knuckle 10 and the vehicle body 4 from the lower side.

The upper arm 14 is provided above the lower arm 12 and connects the knuckle 10 and the vehicle body 4.

The garage adjustment unit 20 is interposed between the lower arm 12 and the vehicle body 4 in the garage direction of the vehicle and is driven as an external force is supplied to adjust the garage of the vehicle.

The garage adjustment part 20 includes a first member 22, a second member 24, and an elastic member 26.

The upper side of the first member 22 is disposed on the vehicle body 4 side and maintains a rotatable state. The first member 22 is formed to be inclined at a lower side with a predetermined inclination.

The first member 22 includes an inclined portion 22a, a protrusion 22b, and a locking portion 22c.

The inclined portion 22a has an inclined surface inclined at a predetermined angle.

The protruding portion 22b extends in the longitudinal direction from the inclined surface of the inclined portion 22a and is a portion into which the elastic member 26 is fitted.

The locking portion 22c extends in the longitudinal direction on both sides of the inclined portion 22a and supports the mounting state of the elastic member 26.

The lower side of the second member 24 is disposed on the lower arm 12 side to maintain the rotatable state. The second member 24 is formed to be inclined at an upper side with a predetermined slope corresponding to the lower side of the first member 22. The second member 24 may be formed in the same shape as the first member 22.

If necessary, the second member 24 may be formed to be partially identical to the first member 22. For example, the second member 24 may form the remaining portions in the same manner except for the inclined portion 22a of the first member 22. The second member 24 may be formed in a plane unlike the inclined portion 22a of the first member 22. In this case, the second member 24 serves to support the elastic member 26.

The elastic member 26 is interposed between the first member 22 and the second member 24 to be pressed or restored according to the transmission of external force, and interlocked with the rotation of the first member 22 and the second member 24. do. The elastic member 26 may be made of a compression coil spring.

On the other hand, the vehicle height control apparatus according to an embodiment of the present invention is configured to rotate the first member 22 and the second member 24, the first rotating member 60, the gear member 70, the first 2 further comprises a rotating member (80).

The first rotating member 60 is a portion interposed between the first member 22 and the vehicle body 4 to allow the first member 22 to be rotatable from the vehicle body 4.

The gear member 70 is coupled to one member and transmits rotational force to the first member 22 as the external force is transmitted.

The second rotating member 80 is interposed between the second member 24 and the lower arm 12 to make the second member 24 rotatable from the lower arm 12. The first rotating member 60 and the second rotating member 80 are made of a bearing.

The gear member 70 is composed of a combination of a pinion gear 72 coupled to the outer surface of the first member 22 and a rack gear 74 meshing with the pinion gear 72.

The driving unit 30 supplies a driving force to the rack gear 74. The drive unit 30 may use a hydraulic cylinder or a pneumatic cylinder, it may be made of a motor. If the driving unit 30 is configured to rotate the pinion gear 72 by driving the rack gear 74, it can be configured in various forms through various design changes. Therefore, the drive unit 30 should not be understood to be limited to a hydraulic cylinder, a pneumatic cylinder and a motor.

The controller 40 supplies a driving control signal corresponding to the driving unit 30 to perform a control operation of adjusting the vehicle height. The vehicle garage control apparatus according to the embodiment of the present invention can adjust the height of the garage by adjusting the lever ratio according to the needs of the user.

On the other hand, the vehicle garage control apparatus according to an embodiment of the present invention further includes a garage sensor 50 for detecting the garage of the vehicle to generate a corresponding garage signal. In this case, the controller 40 analyzes the garage signal input from the garage sensor 50 and compares it with a preset garage value. When the garage is low, the controller 40 supplies the first drive control signal to the driver 30 to supply the vehicle. Carry out a control operation to raise the garage height.

In contrast, the controller 40 performs a control operation to lower the vehicle height by supplying a second driving control signal to the driver 30 when the vehicle height is high. That is, as described above, the lever ratio adjusted according to the embodiment of the present invention may be adjusted according to the user's needs, and may be automatically adjusted according to the input of the garage sensor 50 to adjust the height of the garage.

2 and 3 are views illustrating a state in which the lever ratio is changed in a vehicle height control apparatus according to an exemplary embodiment of the present invention, FIG. 2 is a state in which the lever ratio is greatly changed, and FIG. 3 is a state in which the lever ratio is small. Drawing.

The vehicle garage control apparatus according to the embodiment of the present invention is applied to a double wishbone front wheel suspension device.

The double wishbone front suspension includes a lower arm 12, an upper arm 14, and a knuckle 10.

These components are arranged kinematically according to the behavior of the vehicle. Here, the behavior characteristic of the vehicle occurs according to bumps, rebounds or steering. However, since the geometry points that determine the kinematic behavior of the suspension are fixed to the vehicle body 4, the links of the upper arm 14 and the lower arm 12 constituting the double wishbone suspension are also determined. Will be performed.

As described above, the double wish suspension system has a structural limitation that the other motion performance is deteriorated if the geometry points are determined to satisfy the performance of some of the various factors that determine the motor performance of the vehicle at initial setting. .

For example, if the roll center of the vehicle is set high to increase the turning stability of the vehicle, the wheel tread of the vehicle is severely changed due to the bump or rebound of the tire due to the irregular road surface. Will fall out.

On the contrary, if the roll center is set low to secure the straight stability, the roll rigidity is lowered when the vehicle is turning and the turning stability is reduced.

Here, the roll center of the vehicle is a line extending by connecting the connection portion of the knuckle 10 side and the vehicle 4 side of the upper arm 14 installed on the knuckle 10, the knuckle 10 of the lower arm 12 Assume an intersection where a line extending by connecting the side connection portion and the connection portion of the vehicle body 4 side meets. And a straight line from the intersection point to the ground point between the tire and the ground is assumed. The intersection of the straight line and the center line of the vehicle is the roll center. At this time, the height of the roll center and the ground becomes the height of the roll center.

On the other hand, as described above, in the case of the double wishbone suspension system, there is a structural problem that cannot satisfy both the swing stability and the straight stability at the same time.

An embodiment of the present invention is to adjust the height of the vehicle by adjusting the lever ratio between the lower arm 12 and the vehicle body 4 in the double wishbone suspension.

The garage adjustment unit 20 is installed between the lower arm 12 and the vehicle body 4, and the garage adjustment unit 20 adjusts the garage by automatically adjusting the lever ratio according to the rotational direction between the corresponding components. Done.

1 to 3 will be described in the control operation of the vehicle height control apparatus according to an embodiment of the present invention.

First, the controller 40 analyzes the garage signal input from the garage sensor 50 and compares it with a preset garage value. When the garage is low, the controller 40 supplies the first drive control signal to the driver 30 to provide Carry out a control operation to increase the height of the garage.

When the first drive control signal is supplied to the drive unit 30, the rack gear 74 is driven, and the pinion gear 72 meshed with the rack gear 74 rotates. When the pinion gear 72 is rotated, the first member 22 is rotated in the state shown in FIG. The second member 24 also rotates in association with the rotation of the first member 22.

2 shows a case where the lever ratio a1 / b is large, and the garage is relatively high compared to the case where the lever ratio is small. When the lever ratio is large, it means that the load F of the elastic member 26 is large, and since the elastic member 26 is fully functional, it has a relatively high height.

In contrast, the controller 40 performs a control operation to lower the vehicle height by supplying a second driving control signal to the driver 30 when the vehicle height is high.

When the second drive control signal is supplied to the drive unit 30, the rack gear 74 is driven, and the pinion gear 72 meshed with the rack gear 74 rotates. For reference, the pinion gear 72 is rotated in the direction opposite to the rotational direction during the first drive control operation. When the pinion gear 72 is rotated, the first member 22 is rotated in the state shown in FIG. The second member 24 also rotates in association with the rotation of the first member 22.

3 illustrates a case where the lever ratio a2 / b is small, and the garage is relatively low compared to the case where the lever ratio is large. When the lever ratio is small, the load F of the elastic member 26 acts small, so that the elastic member 26 does not function properly and thus has a relatively low height.

The garage control apparatus of the vehicle according to the embodiment of the present invention adjusts the lever ratio to ensure the straight stability by setting the vehicle's garage low when going straight. When the vehicle goes straight, the bump on the roll of the vehicle is reduced, so that the movement of the knuckle 10 becomes small. In this case, since the vehicle maintains the horizontal state, the height of the roll center is constant, thereby increasing the linear stability.

On the other hand, when it is necessary to keep the height of the vehicle high, the height of the vehicle can be adjusted high. If necessary, the vehicle's left and right garages can be adjusted differently.

For example, when turning the vehicle, turning stability may be increased by differently adjusting the left and right garages of the vehicle. When turning the vehicle, it is necessary to adjust the height by appropriately adjusting the lever ratio by the bump stroke of the outer ring to be turned. Accordingly, when the vehicle is turning, the turning stability may be increased by adjusting the height of the garage in the inner direction and adjusting the height of the garage in the outer direction.

1 is a schematic diagram showing a vehicle height control apparatus according to an embodiment of the present invention.

2 is a view showing a state in which the lever ratio is greatly changed according to an embodiment of the present invention.

3 is a view showing a state in which the lever ratio is changed small in accordance with an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

2 ; Wheel 4; Body

10; Knuckle 12; Lower Arm

14; Upset rock 20; Garage Control

22; First member 24; Second member

26; Elastic member 30; Driving part

40; Control unit 50; Height sensor

60; First rotating member 70; Gear member

72; Pinion gear 74; Rack gear

80; Second rotating member

Claims (5)

Knuckles on which wheels are mounted; A lower arm connecting the knuckle and the vehicle body at a lower side thereof; An upper arm provided above the lower arm and connecting the knuckle and the vehicle body; and A height adjustment unit interposed between the lower arm and the vehicle body in a vehicle height direction and driven as an external force is supplied to adjust a lever ratio between the lower arm and the vehicle body to adjust the height of the vehicle; / RTI &gt; The garage adjustment unit A first member having an upper side disposed on the vehicle body to maintain a rotatable state, and a lower side formed to be inclined with a predetermined slope; A second member having a lower side disposed on the lower arm side to maintain a rotatable state, and an upper side formed to be inclined with a predetermined inclination corresponding to the lower side of the first member, and An elastic member interposed between the first member and the second member, the compression coil spring being pressed or restored in response to the transmission of an external force, the elastic member being interlocked with the rotation of the first member and the second member; Garage control device of the vehicle comprising a. The method of claim 1, The first member and the second member An inclined portion having an inclined surface inclined at the predetermined angle; A protrusion extending in the longitudinal direction from the inclined surface of the inclined portion and into which the elastic member is fitted; Hanging portion extending in the longitudinal direction on both sides of the inclined portion, supporting the mounting state of the elastic member Garage control device of the vehicle comprising a. 3. The method of claim 2, And the second member is formed in the same shape as the first member. The method of claim 3, A first rotating member interposed between the first member and the vehicle body to make the first member rotatable from the vehicle body; A gear member coupled to the first member and transmitting rotational force to the first member as an external force is transmitted, and A second rotating member interposed between the second member and the lower arm to make the second member rotatable from the lower arm; Garage control device of the vehicle further comprising. 5. The method of claim 4, The gear member is composed of a pinion gear coupled to the outer surface of the first member and a rack gear meshing with the pinion gear, A drive unit for supplying a driving force to the rack gear, and A control unit for supplying a driving control signal corresponding to the driving unit to perform a control operation for adjusting the height of the vehicle Garage control device of the vehicle further comprising.

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