JPH10278533A - Height adjustment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain the inclination of car body, and while to adjust the vehicle height in a short time by stopping the operation of one of height adjusting mechanisms close to the target vehicle height when inclination of car body exceeds a degree of the inclination of car body, which gives uncomfortableness to a passenger. SOLUTION: Among three vehicle height adjusting mechanisms, adjusting speed of the mechanism provided in right of a rear wheel, to which a largest share of load is applied, is lowest, and adjusting speed of the mechanism provided in left of the rear wheel, to which the secondary large share of load is applied, is secondary low, and adjusting speed of the mechanism provided in a front wheel, is highest. The vehicle height adjusting mechanism provided in right of the rear wheel, of which adjusting speed is lowest, is always operated, and the preceding adjusting mechanism, of which adjusting speed is highest, and the mechanism, of which adjusting speed is secondary highest, are alternately operated so as to repeat stop and re-operation. At the time of increasing the vehicle height, stop and re-operation of the preceding adjusting mechanism close to the target vehicle height is controlled so as to prevent the inclination of car body and while so as to raise the vehicle height to the target height, vehicle height is increased without giving the uncomfortableness to passenger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle height adjusting device for adjusting a vehicle height to a target vehicle height by using a plurality of vehicle height adjusting mechanisms.

[0002]

2. Description of the Related Art Some large automobiles (vehicles), such as buses, have a structure in which a low-floor vehicle body is used to lower the position of steps used for getting on and off, thereby improving the getting on and off. By the way, this bus has a short distance from the ground to the lower part of the vehicle, so when approaching or passing near a high obstacle, for example, when approaching a curbside road or crossing a curb, Caution must be taken. Therefore, in such a bus, it is considered that the height of the vehicle is increased when necessary to avoid the influence of obstacles and reduce the burden on the driver.

[0003]

In order to increase the vehicle height, a plurality of vehicle height adjusting mechanisms are used to move each part of the vehicle body upward away from the wheels or the axle.
However, cars such as buses are often laid out with heavy parts such as engines and auxiliary equipment concentrated in a part of the vehicle body in order to secure necessary space such as guest rooms, The load shared by the vehicle height adjustment mechanism is different. That is, the adjustment capabilities of the individual vehicle height adjustment mechanisms vary.

For this reason, when the vehicle height adjustment mechanisms are simultaneously operated, the vehicle height adjustment mechanism with the lowest load burden precedes and the vehicle height adjustment mechanism with the next smaller load burden precedes. The adjustment speed varies so as to reach the target vehicle height in order.

In this case, the difference c between the most advanced body part a and the most delayed body part b as shown in FIG. This causes a large inclination of the vehicle body, giving the passengers of the bus an uncomfortable feeling.

Therefore, Japanese Patent Application Laid-Open No. 60-92913 proposes that the vehicle height adjustment mechanisms having a large difference from the target vehicle height be operated one by one sequentially with priority to suppress the inclination at the time of vehicle height adjustment. Has been made.

However, in such vehicle height control, since a plurality of vehicle height adjusting mechanisms are individually operated, there is a problem that it takes a considerably long time until the entire vehicle body is adjusted to the target vehicle height. .

[0008] In particular, in the case of a car such as a bus, it is necessary to complete the height adjustment in as short a time as possible, but this is difficult to cope with. The present invention has been made by focusing on the above circumstances, and its purpose is to suppress the lean of the vehicle body,
It is an object of the present invention to provide a vehicle height adjusting device capable of completing vehicle height adjustment in a short time.

[0009]

According to a first aspect of the present invention, there is provided a vehicle height adjusting device for outputting a vehicle height signal output from each vehicle height detecting means while a plurality of vehicle height adjusting mechanisms are operating. When the output difference between the vehicle and the vehicle exceeds a first predetermined value, for example, a range of the vehicle body inclination which does not cause a passenger to feel uncomfortable, the operation of the vehicle height adjusting mechanism on the side closer to the target vehicle height is temporarily stopped.

[0010] Then, the leaned vehicle body rises toward the target vehicle height while being changed in the direction in which the lean is corrected by the operation of the remaining vehicle height adjusting mechanism. When the output difference between the vehicle height signals is equal to or less than a second predetermined value that is smaller than the first predetermined value, for example, when the posture of the vehicle body returns, the operation of the suspended vehicle height adjusting mechanism resumes, and each vehicle height adjusting mechanism is again activated. To increase the vehicle height.

As a result, the vehicle height reaches the target vehicle height by repeatedly stopping and restarting the vehicle height adjustment mechanism on the side closer to the target vehicle height while continuing to operate the vehicle height adjustment mechanism on the lower adjustment speed side. Go.

Therefore, the inclination during the adjustment of the vehicle height is suppressed to the minimum, so that it is not necessary to give a passenger or the like a sense of discomfort during the adjustment of the vehicle height. In addition, the vehicle height adjustment mechanism with a slow adjustment speed continues to operate, and the vehicle height adjustment mechanism with a fast adjustment speed only pauses while the vehicle height difference is small, so that the vehicle height adjustment is completed in a short time.

In the vehicle height adjusting device according to the second aspect, once the operation of the vehicle height adjusting mechanism on the side closer to the target vehicle height is paused, the operation is not restarted until the magnitude relationship of the vehicle height is reversed. The suspension period becomes longer.

[0014] This means that as the pause period becomes longer,
Since the operation time after the restart is long, frequent stoppages during the vehicle height adjustment are prevented, and the vehicle height can be further adjusted without discomfort. Moreover, since the vehicle height adjustment mechanism does not repeatedly turn on and off, the durability of the vehicle height adjustment mechanism is also good. In the vehicle height adjusting device according to the third aspect, since the vehicle height detecting means serving as a reference for obtaining the output difference between the vehicle height detecting means can be fixed, the control is simplified.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on a first embodiment shown in FIGS. FIG. 1 is a plan view of an automobile (vehicle), for example, a low-floor type bus to which the vehicle height adjusting device of the present invention is applied, wherein 1 is, for example, a vehicle body, 2 is a front wheel of the vehicle body 1, and 3 is a front wheel. Similarly, the rear wheel 4 is an engine (for driving the rear wheel 3) mounted on one side in the vehicle width direction on the rear side of the vehicle body, for example.

The front wheel 2 and the rear wheel 4 are, for example, an air suspension 5 using an air spring 5a.
Suspended from. The vehicle height adjusting device includes, for example, three vehicle height adjusting mechanisms 10, in which both front wheels 2 of the bus are one system (front of the vehicle body) and each of the left and right wheels of the rear wheel 3 is one system (left and right of the rear of the vehicle body). 20 and 21, these vehicle height adjustment mechanisms 1
The vehicle height is adjusted by supplying air pressure from 0, 20, 21 to, for example, an air tank 6 (air pressure source) mounted on the vehicle body 1 into an air spring 5a for each wheel serving as a vehicle height adjustment unit. Structure is adopted.

Specifically, each of the vehicle height adjustment mechanisms 10, 20,
The device 30 is provided with an improved device that keeps the original vehicle height (the vehicle height brought by the low floor vehicle) constant, and temporarily increases the target vehicle height higher than the original vehicle height (for example, several tens mm higher than the original vehicle height). (Vehicle height).

These vehicle height adjustment mechanisms 10, 20, 21
The same structure is adopted in each case. Among them, for example, the vehicle height adjusting mechanism 10 on the front wheel side (the front part of the vehicle body) will be described. In the drawing, reference numeral 11 denotes a communication passage communicating between the air springs 5a of the left and right wheels. An air path 12 connected to the air tank 6 branches off from the communication path 11.

An air supply valve 13 composed of, for example, an electromagnetic three-way valve, a leveling valve 14 that performs a supply / exhaust operation in response to a change in the original vehicle height of the vehicle body 1 from the upstream side, that is, from the air tank side. (A control device for keeping the original vehicle height constant), an air circuit shutoff valve 15 (made of, for example, an electromagnetic two-way valve) for stopping the operation of the leveling valve 14, and releasing the air pressure in the air spring 5a to the atmosphere. Exhaust valve 16 is provided.

From the air supply valve 13, the exhaust valve 1
6, for example, a bypass passage 17 connected between the connection portion with the communication passage 11 and the exhaust valve 16 extends,
An air circuit capable of forming a vehicle height up mode for raising the vehicle height from the original vehicle height to the target vehicle height, an up vehicle height holding mode for maintaining the target vehicle height, and a vehicle height return mode for returning to the original vehicle height.

That is, in the vehicle height increasing mode, the air circuit shutoff valve 15 is turned on (the levering valve 14 is not functioning), and the air pressure of the air tank 6 is directly increased through the air supply valve 13 and the bypass passage 17. This is a mode in which the air is supplied to the air spring 5a.

The up-vehicle-height holding mode is a mode in which the air supply valve 13 is turned off to seal the air pressure in the air spring 5a from the up-height-up mode. The vehicle height recovery mode is a mode in which the exhaust valve 16 is turned on to release the air pressure in the air spring 5a from the exhaust valve 16 to the atmosphere from the up vehicle height holding mode.

The control device of the front-wheel-side vehicle height adjustment mechanism 10 is the same as the control device of the other rear-wheel left and right-side vehicle height adjustment mechanisms 20, 21, and further, the vehicle height adjustment mechanism 10, 20, 21.・ Vehicle height sensor 22 provided at the rear (corresponding to vehicle height detection means)
Together with an ECU 23 (for example, a microcomputer, which corresponds to a control means).

When the vehicle height up switch 24 connected to the ECU 23 is turned on, for example,
A function of operating each of the vehicle height adjustment mechanisms 10, 20, and 21 to a preset target vehicle height in the vehicle height up mode, and a function of entering an up vehicle height holding mode when the vehicle reaches the target vehicle height are set. . When the vehicle height up switch 24 is turned off, the ECU 23 informs the ECU 23 of each vehicle height adjustment mechanism 10,
A function for operating the motors 20 and 21 in the vehicle height recovery mode is set.

The present invention is applied to the operation control of the vehicle height adjusting mechanisms 10, 20, 21 in the vehicle height increasing mode, and the vehicle height adjusting mechanisms 10, 20, 21 are corrected while correcting the variation of the adjusting ability. High up can be done.

Here, the bus of this embodiment has, for example, a heavy engine 4 mounted on the rear right side of the vehicle body.
Of the two vehicle height adjustment mechanisms 10, 20, 21, the adjustment speed on the right side of the rear wheel where the load is shared is the slowest, and then the adjustment speed on the left side of the rear wheel where the load is shared is the slowest, and the remaining front wheel side (The front part of the vehicle body) has the fastest adjustment speed (because the load burden is the smallest), so that each vehicle height adjustment mechanism 10, 2
The adjustment performance of 0, 21 varies.

In view of this, the ECU 23 is provided with a function for performing the vehicle height increasing operation in the following manner in consideration of the variation. (1) The vehicle height adjustment mechanism 20 on the right side of the rear wheel, which has the slowest adjustment speed
The output difference from the vehicle height sensor 22 corresponding to the front wheel side vehicle height adjustment mechanism 10 having the fastest adjustment speed is equal to or greater than a predetermined value, based on the output from the vehicle height sensor 22 (front wheel side) corresponding to Above a first vehicle height difference value D1 (first predetermined value) determined from the limit of the vehicle body inclination range that does not cause a passenger to feel uncomfortable, the vehicle height on the front wheel side where the adjustment speed is the fastest. The function of temporarily stopping the operation of the adjustment mechanism 10.

(2) After the stop, a value of the difference where the output difference is smaller than D1, ie, a threshold value for minimizing the body inclination,
For example, the second vehicle height difference value D2 (=
(-D1: second predetermined value) or less, the function of restarting the operation of the front-wheel-side vehicle height adjustment mechanism 20, which has been stopped and has the highest adjustment speed, is resumed.

(3) On the basis of the output from the vehicle height sensor 22 (front wheel side) corresponding to the vehicle height adjusting mechanism 20 on the right rear wheel, which is the slowest adjusting speed, the vehicle on the rear wheel left having the second fastest adjusting speed The output difference from the vehicle height sensor 22 corresponding to the height adjustment mechanism 21 is equal to or greater than a predetermined value, that is, a threshold value for minimizing the vehicle body inclination, for example, a third vehicle height determined from the limit of the vehicle body inclination range that does not give a passenger an uncomfortable feeling. When the difference value becomes equal to or more than the difference value D3 (first predetermined value), the vehicle height adjustment mechanism 2 on the left side of the rear wheel having the second highest adjustment speed
Function to temporarily suspend the operation of 1.

(4) After the pause, the output difference is smaller than D3, that is, a threshold value for minimizing the vehicle body inclination,
For example, the fourth vehicle height difference value D4 (=
(D1: second predetermined value) or less, the function of restarting the operation of the vehicle height adjusting mechanism 21 on the left side of the rear wheel, which is the second fastest adjusting speed, that has been stopped.

With such a function, in the vehicle height increasing mode, while the vehicle height adjusting mechanism 20 having the slowest adjusting speed continues to operate, the other preceding vehicle height adjusting mechanisms having the fast adjusting speed, specifically, two vehicle height adjusting mechanisms. The height adjustment mechanisms 10 and 21 are operated while being repeatedly paused and restarted so that the height of the bus can reach the target vehicle height quickly and while minimizing the body inclination.

The control at the time of increasing the vehicle height is shown in the flowchart of FIG. In addition, the flowchart of FIG. 2 is a two-channel vehicle height adjustment device in which the contents of the three-channel vehicle height adjustment device are simplified in order to make the contents easily understandable.
For example, it is created on the premise of a device in which a vehicle height adjustment mechanism 10 at the front of the vehicle body and a vehicle height adjustment mechanism 20 (or 21) at the rear of the vehicle body are combined.

Next, according to this flowchart,
The control when the vehicle height is increased will be described. Now, for example, a bus driver turns on the vehicle height up switch 24 (step S1).

Then, the ECU 23 stores the target vehicle height stored in a memory (not shown) (for example, several tens of
(mm target value), a first vehicle height difference value D1 (corresponding to a first predetermined value), and a second vehicle height difference value D2 (= -D1: corresponding to a second predetermined value) are read and set, respectively (step S2). ~ Step S
4).

Next, the vehicle enters the vehicle height increasing mode (step S5). Then, first, the ECU 23 turns on the air supply valve 13, turns on the air circuit cutoff valve 15, and turns off the exhaust valve 16 of each of the vehicle height adjustment mechanisms 10 and 20 (or 21) at the front and rear of the vehicle body.

Thus, the air pressure in the air tank 6 is increased by the air in the air suspension 5 that suspends the axle on the front side of the vehicle body through the air supply valve 13 and the bypass 17 in each of the vehicle height adjustment mechanisms 10, 20 (or 21). The air is supplied to the spring 5a and the air spring 5a of the air suspension 5 which suspends the axle on the rear side of the vehicle body, and lifts the front and rear portions of the vehicle body 1 of the bus.

Next, the ECU 23 sets the vehicle height adjusting mechanism 10 at the front of the vehicle body to the fast adjusting side F, and sets the vehicle height adjusting mechanism 20 (or 21) at the rear of the vehicle body to the slow adjusting side S (S). Step S6). This is because it is known that when the heavy engine 4 is mounted on the rear part of the vehicle body, the rear wheel 3 has a larger load sharing than the front wheel 2 in advance.

Subsequently, the ECU 23 reads the output of the vehicle height sensor 22 for detecting the vehicle height at the front and rear of the vehicle body, and reads the current vehicle front and rear portions which are lifted by the vehicle height adjustment mechanisms 10 and 20 (or 21), respectively. Is detected (step S7).

If the detected vehicle height has not reached the target vehicle height (step S8), the ECU 23 outputs the output of the vehicle height sensor 22 corresponding to the vehicle height detecting mechanism 20 (or 21) which has the slowest adjustment speed. And the vehicle height difference (FS) between the fast and slow sides of the adjustment speed obtained based on
The vehicle height difference value D1 is compared (step S9).

At this time, if the vehicle height difference has not reached the first vehicle height difference value D1, the ECU 23 determines that the vehicle body 1 will not give a passenger an uncomfortable feeling due to the operation of both the vehicle height adjusting mechanisms 10, 20 (21). It is determined that the vehicle is well lifted, and the vehicle body up at the front and rear of the vehicle body is continued as it is.

When the vehicle height difference reaches the first vehicle height difference value D1, the ECU 23 determines that the vehicle body 1 has tilted to a limit within a range that does not give a passenger an uncomfortable feeling, and the vehicle is closer to the target vehicle height, that is, ahead of the target vehicle height. Vehicle height adjustment mechanism 10 on the side of high adjustment speed
Is temporarily stopped (step S10).

During this pause, since the vehicle height adjusting mechanism 10 on the slower adjustment speed is operating, the vehicle body 1 rises toward the target vehicle height while displacing in the direction in which the inclination is corrected. During this time, the ECU 23 reads the outputs of the front and rear vehicle height sensors 22 corresponding to the faster and slower adjustment speeds, and detects the current front and rear vehicle heights (step S11).

If the detected vehicle height has not reached the target vehicle height (step S12), the vehicle height difference (FS) between the fast and slow adjustment speeds and the second vehicle height difference value D2 are calculated. Compare (Step S13).

At this time, if the vehicle height difference has not reached the second vehicle height difference value D2, the ECU 23 operates the vehicle height adjustment mechanism 20 (or 21) having a low adjustment speed to cause the vehicle body 1 to feel uncomfortable for the passenger. It is determined that the vehicle is well lifted within the range not given, and the vehicle body rearward rearward is continued to be raised.

When the vehicle height difference reaches the second vehicle height difference value D2, the ECU 23 determines that it is time to restart the operation of the vehicle height adjustment mechanism 10 having a high adjustment speed, and suspends operation. The operation of the vehicle height adjustment mechanism 10 is resumed, and the vehicle height is increased again by both the vehicle height adjustment mechanism 10 having a high adjustment speed and the vehicle height adjustment mechanism 20 (or 21) having a low adjustment speed (step). S14).

The routine of steps S7 to S14 is repeatedly performed until the vehicle height reaches the target vehicle height. As a result, the vehicle height of the bus repeats the pause and restart of the vehicle height adjustment mechanism 10 on the side closer to the target vehicle height while continuing to operate the vehicle height adjustment mechanism 20 (or 21) on the slowest adjustment speed side. , To reach the target vehicle height. When the vehicle reaches the target vehicle height, the intake valve 13 is turned off, and the target vehicle height is maintained (step S15).

If a three-channel vehicle height adjustment device is used, the vehicle height adjustment mechanism 2 on the right side of the rear wheel having the slowest adjustment speed indicated by a solid line as shown in the diagram of FIG.
0 always operates as indicated by the solid line, and the vehicle height adjustment mechanism 10 having the fastest adjustment speed and the vehicle height adjustment mechanism 21 having the next highest adjustment speed alternately stop / stop the preceding mechanism as indicated by the dashed line and the broken line. It appears as an operation of repeating resumption. The vehicle height adjustment mechanism 10 having the fastest adjustment speed and the vehicle height adjustment mechanism 21 having the second highest adjustment speed have been described above so as to minimize the vehicle body inclination, that is, to suppress the vehicle body to an inclination that does not give a passenger an uncomfortable feeling. Like the slowest vehicle height adjustment mechanism 2
Pause at the point of difference D1 and D3 with reference to the output of 0, and resume at the point of difference D2 and D4, which is smaller than that.

In this way, when the vehicle height is increased, the suspension / restart control is given to the preceding vehicle height adjustment mechanism 10 (21) on the side closer to the target vehicle height, so that the vehicle body 1 having the original vehicle height prevents the vehicle body from leaning. Since the vehicle height is raised to the target vehicle height, the vehicle height can be increased without giving the passenger a sense of incongruity.

Moreover, the slowest vehicle height adjustment mechanism 20 continues to operate, and the vehicle height adjustment mechanism 10 (21), which has a fast adjustment speed.
Stops only while the vehicle height difference is small, so that the vehicle quickly reaches the target vehicle height.

Therefore, while minimizing the body inclination,
Vehicle height adjustment can be completed in a short time. In particular, if the value of D2 or D4 (the second predetermined value) is different from the value of D1 or D3, the operation of the vehicle height adjusting mechanism 10 (21) is continued until the magnitude relationship of the vehicle height reverses. Since the vehicle is not restarted and the operation time after the restart is lengthened, the frequent vehicle height adjustment mechanism 10 during the vehicle height adjustment is used.
Since the temporary stop of (21) can be prevented, the vehicle height can be further adjusted without discomfort. Moreover, since the vehicle height adjustment mechanism 10 (21) does not repeatedly turn on and off,
The durability of the vehicle height adjusting mechanism 10 (21) can also be improved.

The ECU 23 is adapted to determine D1 to D4 in advance based on the output of the vehicle height sensor 22 corresponding to the vehicle height adjustment mechanism 20 which has the slowest adjustment speed in terms of capability. Height adjustment mechanism 20
Can be fixed, signal processing for control is simplified,
Control becomes simple.

In the first embodiment, an example in which the reference vehicle height adjustment mechanism 20 is specified has been described. However, even when it is not possible to specify which vehicle height adjustment mechanism 10, 20 has a low adjustment speed. The present invention may be applied.

FIGS. 4 and 5 are flowcharts showing an example of this control. That is, the flowchart of FIG. 4 replaces the step S6 of the flowchart of FIG. 2 by replacing the “vehicle height up speed difference extraction” shown in step S20 for specifying a vehicle height adjustment mechanism with a slow adjustment speed. FIG. 5 shows the control of "extraction of vehicle height-up speed difference" which is a subroutine of "1".

This routine will be described. This routine includes a third vehicle height difference D3 for defining the adjustment speed.
Is read (step S21), and the vehicle height at the front and rear of the vehicle body when the vehicle height is increased from the vehicle height sensor 22 until the vehicle height difference between the front of the vehicle body and the rear of the vehicle body can be compared (step S21). S21 to step S24), and thereafter, the magnitude relationship between the read vehicle heights of the front part and the rear part of the vehicle body is compared (step S25), and the vehicle height adjustment mechanism corresponding to the larger vehicle height is adjusted to the side F having the higher adjustment speed. The other vehicle height adjusting mechanism is set to the side S whose adjustment speed is slow (step S2).
6, step S27).

The specification of the vehicle height adjusting mechanism is effective when the load to be shared is unclear or when the vehicle height of the vehicle body is to be increased so as to be affected by the load applied from the outside.

In the above-described embodiment, an example in which the body of the bus is adjusted has been described. However, it is needless to say that the present invention can be applied to a vehicle height adjusting device for adjusting the height of other vehicles. Further, in the above-described embodiment, an example is described in which the present invention is applied to control when the vehicle height is increased, but the present invention can also be applied to control when the vehicle height is decreased.

[0057]

As described above, according to the first aspect of the present invention, when adjusting the vehicle height, the vehicle height adjustment means on the side closer to the target vehicle height is repeatedly deactivated and reactivated to reduce the vehicle body inclination. The vehicle height adjustment can be completed in a short time while suppressing the vehicle height to the minimum.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described in (1), frequent temporary stop during the vehicle height adjustment can be prevented, so that the vehicle height adjustment can be further performed without discomfort. Moreover, since the vehicle height adjustment mechanism does not repeatedly turn on and off, the durability of the vehicle height adjustment mechanism can be improved.

According to the third aspect of the present invention, the first aspect
In addition to the effects of the invention described in (1), since the vehicle height detecting means serving as a reference for obtaining the output difference can be fixed, control can be simplified.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a vehicle height adjustment device according to a first embodiment of the present invention, together with an automobile equipped with the device.

FIG. 2 is a flowchart for explaining control when the vehicle height is increased in the same device.

FIG. 3 is a diagram for explaining a behavior when the vehicle is raised from a source vehicle height to a target vehicle height by the same control.

FIG. 4 is a flowchart for explaining control at the time of increasing the vehicle height, which is a main part of a second embodiment of the present invention.

FIG. 5 is a flowchart for explaining control for specifying a vehicle height adjustment mechanism having a slow reference adjustment speed in the flowchart.

FIG. 6 is a diagram for explaining that the adjustment speed varies when the vehicle height adjustment mechanisms are simultaneously operated to increase the vehicle height due to the difference in the shared loads acting on the plurality of vehicle height adjustment mechanisms.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Body 2 ... Front wheel 3 ... Rear wheel 5a ... Air spring (vehicle height adjustment part) 10, 20, 21 ... Vehicle height adjustment mechanism 22 ... Vehicle height sensor (vehicle height detection means) 23 ... ECU (control means, target vehicle) Height setting means) 24. Vehicle height up switch (target vehicle height setting means).

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshiaki Tateno Mitsubishi Motors Corporation

Claims (3)

[Claims] 1. A plurality of vehicle height adjustment mechanisms provided for each wheel or axle; a plurality of vehicle height detection means provided for each of the plurality of vehicle height adjustment mechanisms; and a target vehicle height for setting a target vehicle height Setting means, and control means for controlling the operation of the vehicle height adjustment mechanism so that the vehicle height at the wheel or axle on which the vehicle height adjustment mechanisms are provided is the target vehicle height set by the target vehicle height setting means. The control means, during the control to the target vehicle height, when the output difference between the vehicle height detection means is equal to or more than a first predetermined value, the control means activates the vehicle height adjustment mechanism on the side closer to the target vehicle height Vehicle height adjustment, wherein when the output difference falls below a second predetermined value smaller than the first set value, the operation of the suspended vehicle height adjustment mechanism is resumed. apparatus. 2. The vehicle height adjusting device according to claim 1, wherein the second predetermined value is a value having a different sign from the first predetermined value. 3. The control unit according to claim 1, wherein the control unit determines the output difference based on an output of a vehicle height detecting unit corresponding to a vehicle height adjusting unit having the slowest adjusting speed. Height adjustment device.