JPH01145216A - Control suspending device in car height adjustment control - Google Patents

Abstract

PURPOSE:To obviate the useless repetition of car height adjustment control by calculating the car height difference on the diagonal line of a vehicle and comparing the car height difference with a prescribed threshold car height and suspending the car height adjustment control when the car height difference is over the threshold car height. CONSTITUTION:A control circuit 4 having the high, intermediate, and low car height selecting switches 1-3 connected receives each detection signal of a car speed sensor 5 and the front/rear and right/left car height sensors 6-9. The control circuit 4 outputs each prescribed control signal into a motor driving relay 10 and the front/rear and right/left fluid pressure control valves 11-14. Therefore, a compressor 16 is driven by a motor 15 and each fluid pressure is supplied into the front/rear and right/left suspensions 17-20. In this case, the control circuit 4 calculates the car height difference on the diagonal line of a vehicle, and compares the car height difference with a prescribed threshold car height, and when the car height is over the threshold value, car height adjustment control is suspended.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle height adjustment device, and more particularly to a control stop device for preventing undesirable repetitive control of vehicle height adjustment control.

[Prior Art] Generally, in a vehicle, a suspension is disposed between the axle and the vehicle body in order to prevent vibrations of the axle from being transmitted to the vehicle body. For this reason, when the vehicle weight increases, the vehicle body sinks, and when the vehicle weight becomes lighter, the vehicle body rises. Also, when braking suddenly, the front of the car sinks, the rear of the car sinks when going uphill, and the front of the car sinks when going downhill.

Therefore, conventionally, a vehicle height sensor is installed between the axle and the vehicle body to detect the vehicle height, and the fluid pressure of the suspension is adjusted so that the detected vehicle height is within a set range (for example, US Patent No. 4105216: 1
978 CL 280).

In this type of vehicle height adjustment device, feedback control is performed so that the vehicle height falls within a vehicle height range set in the vehicle from the beginning or within a manually set vehicle height range.

However, when driving a vehicle, it is preferable that the vehicle body be low when traveling at high speeds, and it is preferable that the vehicle body be somewhat high when traveling at low speeds to prevent interference between the vehicle body and the road surface. Therefore,
Vehicle height adjustment devices that adjust vehicle height according to vehicle speed are also provided. For example, the technique disclosed in Japanese Unexamined Patent Publication No. 57-'118907 can be mentioned.

The technology described in the above publication includes a vehicle height sensor that detects the height between the axle and the vehicle body, a compressor that applies fluid pressure to the suspension that supports the vehicle body between the axle and the vehicle body, and a valve that controls fluid pressure within the suspension. means, an automatic vehicle height control device that compares the vehicle height detected by the vehicle height sensor with a target vehicle height and controls the energization of the compressor and valve means in a direction in which both of them match; The target vehicle height is set accordingly.

[Problems to be Solved by the Invention] However, in conventional vehicle height adjustment VC systems, when a wheel runs onto a large step such as a curb, the compressor and valve device are repeatedly energized and the vehicle height is adjusted. There was a problem that the adjustment was not completed.

This problem occurs through the following process.

That is, for example, assuming that the right rear wheel runs over a step, the load on the right rear wheel that ran over the step and the left front wheel located diagonally to the right rear wheel increases, and as a result, the right rear wheel and the vehicle height of the left front wheel decreases. Further, the load on the other wheels, that is, the left rear wheel and the right front wheel, becomes smaller, and the vehicle height of both wheels increases. At this time, the right rear wheel and left front wheel whose vehicle height has been lowered are lowered by the adjustment control operation of the vehicle height adjustment device, and the left rear wheel and right front wheel whose vehicle height has been raised are lowered.

However, when a wheel runs over a step, the inclination of the vehicle body with respect to the road surface increases due to the adjustment control operation of the vehicle height adjustment device described above, and variations in vehicle height for each wheel may not be improved. In such a case, vehicle height adjustment is repeated endlessly, which deteriorates the durability of the suspension.

Another problem is that it gives a sense of uneasiness or discomfort to the occupants sitting in the vehicle body.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a control/stop device for vehicle height adjustment in order to prevent unnecessary repetition of vehicle height adjustment.

[Means for Solving the Problems] The control and stopping device for vehicle height adjustment control according to the present invention calculates a vehicle height difference between detected vehicle heights using a pair of diagonally located vehicle height sensors of four wheels of a vehicle, and Compare the vehicle height difference with a predetermined threshold vehicle height,
When it is determined from the comparison output that the vehicle height difference is greater than or equal to a predetermined threshold vehicle height, the vehicle height adjustment control is stopped.

[Operation] In the present invention, vehicle height sensors disposed on the four wheels of the vehicle detect the vehicle height between the ground and the vehicle body as the height between the axle and the vehicle body. Then, the vehicle height difference calculation means calculates the vehicle height difference between the vehicle height sensors on the diagonal of the vehicle. for example,
Calculates the vehicle height difference between the detected vehicle height between the right front wheel and the left rear wheel, and between the left front wheel and the right rear wheel.

The vehicle height difference calculated by the vehicle height difference calculation means is input to the comparison means, and the vehicle height difference is compared with a predetermined threshold vehicle height. When the comparison result of the comparison means determines that the vehicle height difference is less than a predetermined threshold vehicle height, the control means performs vehicle height adjustment control according to the output of the vehicle height sensor to adjust the vehicle height to a value that meets the condition. do.

Furthermore, when it is determined that the vehicle height difference is equal to or greater than a predetermined threshold vehicle height based on the output of the comparison means, the vehicle height adjustment control of the control means is stopped.

[Example] Examples of the present invention will now be described.

Fig. 1 is a configuration diagram of a fluid control system and an electric control system of a control stop device for vehicle height adjustment control according to an embodiment of the present invention, and Fig. 2 is a diagram showing a control stop device for vehicle height adjustment control according to an embodiment of the present invention. FIG.

In the figure, the tear-open circuit ECU is composed of a microcomputer, etc., and is program-controlled. The vehicle speed sensor SS is a detector used as a speedometer that detects the traveling speed of the vehicle as the reciprocal of the pulse period.

The compressor CP is a fluid pressure supply source rotated by the motor M, and is driven by controlling the motor drive relay RY with the output of the control circuit ECU. dryer DR
is from the fluid pressure supply source compressor CP to the right front wheel air suspension EFR, the left front wheel air suspension EFL,
Right rear wheel air suspension ERR1 This is to remove the humidity of the fluid supplied to the left rear wheel air suspension ERL. The exhaust solenoid valve EX discharges the fluid pressure of the right front air suspension EFR1, the left front air suspension EFL, the right rear air suspension ERR, and the left rear air suspension ERL using the output of the control circuit ECU, and adjusts the vehicle height. It becomes the same when the voltage drops, and is closed in the normal state.

Low vehicle height selection switch LOWSW, intermediate vehicle height selection switch NORMAL SW, and high vehicle height selection switch HI
GH3W is a vehicle height selection switch that selects three levels of vehicle height.

The right front wheel height sensor FR is a detector that detects the height between the right front wheel axle (not shown) and the vehicle body BO as a predetermined gray code. Between the axle and the vehicle body 80, the vehicle body 8
The right front wheel air suspension EFR, which supports the 0, controls its vehicle height by supplying air pressure. The front right wheel solenoid valve VFR is a valve that controls the supply of fluid pressure from the compressor "jCP" to the front right wheel air suspension EFR.

Further, the left front wheel height sensor FL is a detector that detects the height between the left front wheel axle and the vehicle body BO as a predetermined code. The left front wheel air suspension EFL, which is located between the axle and the vehicle body 80 and supports the vehicle body BO, controls its vehicle height by supplied air pressure. The front left wheel air suspension valve VFL is the front left wheel air suspension EFL.
This valve controls the supply of fluid pressure from the compressor CP to the compressor CP.

Similarly, the right rear wheel height sensor RR is a detector that detects the height between the right rear wheel axle (not shown) and the vehicle body BO as a predetermined code. The right rear wheel air suspension ERR, which is located between the axle and the vehicle body BO and supports the vehicle body BO, controls its vehicle height by supplying air pressure. The right rear wheel solenoid valve VRR is a valve that controls the supply of fluid pressure from the compressor JCP to the right rear wheel air suspension ERR.

Further, the left rear wheel height sensor RL is a detector that detects the height between the left rear wheel axle and the vehicle body BO as a predetermined code. The left rear air suspension ERL, which is located between the axle and the vehicle body BO and supports the vehicle body BO, controls its vehicle height by supplied air pressure. The left rear wheel solenoid valve VRL is the left rear wheel air suspension ERL.
This valve controls the supply of fluid pressure from the compressor CP to the compressor CP.

The control and stop device for vehicle height adjustment control of this embodiment configured as described above is controlled as follows.

3 to 6 are flowcharts for controlling the main program of the control circuit ECU of the control stop device for vehicle height adjustment control according to an embodiment of the present invention.

This program starts control by turning on an ignition switch (not shown).

First, in step S1, the RAM and output port used when executing this program are initialized. At this time, each front right wheel up request flag and right front wheel down request flag,
"O" to lower the left front wheel up request flag, the left front wheel down request flag, the right rear wheel up request flag, the right rear wheel down request flag, the left rear wheel up request flag, and the left rear wheel down request flag.
Set it as to). In step S2, the interrupt permission flag is set to "1". In step S3, it is determined that the processing timing has arrived, and when the predetermined processing timing has arrived, in step S4, the right front wheel height sensor FR → the left rear wheel height sensor RL → the left front wheel height sensor FL → the right rear wheel. Call a data input routine that reads the vehicle height of the four wheels in rotation with the vehicle height sensor RR. This data input routine uses the outputs of the right front wheel height sensor FR, left rear wheel height sensor RL, left front wheel height sensor FL, and right rear wheel height sensor RR as serial signals, so it rotates the four-wheel vehicle. Although the vehicle height is being read, the vehicle height of the four wheels may also be read at the same time.

In step S5, the timing of vehicle speed calculation is determined, and when it is the timing of vehicle speed calculation, in step S6, the pulse period of vehicle speed detection performed by a known interrupt routine, the explanation of which is omitted here, is read out, and the pulse period input from the vehicle speed sensor SS is read out. The vehicle speed is calculated by multiplying the reciprocal of the period by the count. Further, in step S7, it is determined whether it is time to calculate the vehicle height, and when it is the timing to calculate the vehicle height, the vehicle height is calculated in step S8. This vehicle height calculation converts the gray code output of each right front wheel height sensor FR1, left rear wheel height sensor RL, left front wheel height sensor FL, and right rear wheel height sensor RR into binary code,
Stock up on data from the past eight or so times and calculate the average vehicle height.

In step S9, it is determined from the ignition signal or the engine revolution meter whether the engine is currently rotating. When stopped, all solenoid valves, ie, front right wheel solenoid valve VFR.

The front left wheel solenoid valve VFL, the rear right wheel solenoid valve VRR, and the rear left wheel solenoid valve VRL are closed, and the driving of the motor M is brought to a halt state in order to bring the compressor CP to a halt state.

When it is determined in step S9 that the engine is currently rotating, a target vehicle height is selected in step 310.

This target vehicle height is based on vehicle speed data, vehicle height selection switch low vehicle height selection switch L OWS W, intermediate vehicle height selection switch NORMAL SW, or high vehicle height selection switch H
From the target vehicle height map created from the input of IGH3W and the passage conditions based on the maximum and minimum vehicle height sensor values, the vehicle speed data, vehicle height selection switch input, and the maximum and minimum vehicle height sensor values are used. Select the target vehicle height.

In step 811, the right front wheel lift request flag is set, and in step 3
Check the right front wheel lowering request flag at step 12. At the beginning of this routine, the right front wheel up request flag and the right front wheel down request flag are down (“O”), so step 3
In step 15, it is determined whether the estimated vehicle height calculated in step S8 is greater than or equal to the maximum value of the target vehicle height selected in step 310. When the calculated vehicle height is greater than or equal to the maximum target vehicle height, a right front wheel elevation request flag is set in step 316 (“
In step S17, it is determined whether the calculated vehicle height is less than or equal to the minimum value of the target vehicle height.

When the calculated vehicle height is less than or equal to the minimum value of the target vehicle height, step 31
At step 8, the right front wheel lowering request flag is set (set to "1").

If you enter this routine from next time onwards, go to step 31.
1, the right front wheel lift request flag is set in step 316 (set as "1"), and the right front wheel lower request flag is set in step 318 (set as "1") in step 312, and the right front wheel is requested to rise. When the flag or right front wheel lowering request flag is set (“1”),
In step 313, it is determined whether the state continues for a predetermined period of time. If the condition does not continue for the predetermined period of time in step 313, it is assumed that there is no continuous request to raise the vehicle height of the right front wheel due to the driving conditions, and that the request is based on mere noise or data obtained when overcoming unevenness on the road surface. , set in step S16 in step 314 (
The right front wheel raising request flag (set to "1") or the right front wheel lowering request flag set in step 318 (set to "1") is lowered (set to "0").

Further, the left front wheel raising request flag is checked in step S21, and the left front wheel lowering request flag is checked in step S322. At the beginning of this routine, the front left wheel raise request flag and the left front wheel lower request flag are down ("0"), so the calculated vehicle height calculated in step S8 in step 325 is Determine whether the selected target vehicle height is greater than or equal to the maximum value. When the calculated vehicle height exceeds the maximum value of the target vehicle height, a left front wheel elevation request flag is set (set to "1") in step 326. Further, in step S27, it is determined whether the calculated vehicle height is less than or equal to the minimum value of the target vehicle height. When the calculated vehicle height is less than or equal to the minimum target vehicle height (IIf), step 328
Set the left front wheel lowering request flag (set to "1").

When entering this routine from next time onwards, step 32
1, the left front wheel lift request flag is set in step 326 (set to "1"), and the left front wheel lowered request flag is set in step 32B (set as 641 $1) in step 322, and the left front wheel is requested to rise. When the flag or the left front wheel lowering request flag is set ("1"), it is determined in step 323 whether this state continues for a predetermined period of time. If the condition does not continue for the predetermined period of time in step 323, it is assumed that there is no continuous request to raise the vehicle height of the left front wheel due to the driving conditions, and that the request is based on data obtained when overcoming simple noise or unevenness on the road surface. In step 324, the left front wheel upper back request flag set in step 326 (set to "1'") and the left front wheel lowering request flag set in step 328 (set to "1") are lowered ("Opt" is set). do).

Similarly, for the right rear wheel, in steps 331 to 338, and for the left rear wheel, in steps S41 to 348, the right rear wheel rise request flag or the right rear wheel lowering request flag, the left rear wheel rise request flag, or the left rear wheel Raise or lower the wheel lowering request flag.

In this way, the need to change the vehicle height of the four wheels of the vehicle is determined by the right front wheel up request flag or the right front wheel lowering request flag, the left front wheel raising request flag or the left front wheel lowering request flag, and the right rear wheel raising request flag, respectively. flag or right rear wheel lowering request flag,
The information is stored by setting or lowering the left rear wheel up request flag or the left rear wheel down request flag.

Then, in step 350, all request flags are set, that is, right front wheel up request flag, right front wheel down request flag, left front wheel up request flag, left front wheel down request flag, right rear wheel up request flag, right rear wheel down request flag, left When both the rear wheel up request flag and the left rear wheel down request flag are down (“0”), the routine starts from repeat step S3.

When any one of the all request flags is set (“1”) in step 350, it is determined in step S51 whether the current vehicle speed is less than or equal to a predetermined threshold vehicle speed. In this embodiment, the predetermined threshold vehicle speed is set at 7 km/h due to the reliability of the vehicle speed based on the accuracy of the vehicle speed sensor SS. However, the predetermined threshold vehicle speed may be set to a speed that is at or close to stopping. When the current vehicle speed is higher than the predetermined threshold vehicle speed, the control interruption flag is lowered in step 355 (“O1
1). Then, in step S56, it is confirmed that the control interruption flag has been lowered, and in step S57, the "vehicle height control routine" is called, and known vehicle height adjustment control is performed according to the output state specification diagram shown in FIG. .

If it is determined in step 351 that the current vehicle speed is less than or equal to the predetermined threshold vehicle speed, then in step 852 the sum of the right front wheel height sensor FR and the left rear wheel height sensor RL located diagonally of the four wheels of the vehicle, and the left front wheel A diagonal vehicle height difference is calculated from the sum of the vehicle height sensor FL and the right rear wheel height sensor RR, and is stored in the vehicle height difference memory H.

In step 353, it is determined whether the vehicle height difference stored in the vehicle height difference memory H is greater than or equal to a predetermined threshold vehicle height ΔH, and when the vehicle height difference stored in the vehicle height difference memory H is smaller than the predetermined threshold vehicle height, dH, that is, If the vehicle height adjustment is operating normally, the control interruption flag is lowered in step S55 (set to "Ott"), and the process proceeds to step 356 to proceed to the aforementioned "vehicle height control routine" in step 357.

When the vehicle height difference stored in the vehicle height difference memory H in step 353 is greater than or equal to the predetermined threshold vehicle height ΔH, that is, when undesirable repetition of vehicle height adjustment occurs, a control interruption flag is set in step 354 ( In step 356, it is confirmed that the control interruption flag is set, and in step 358, all solenoid valves are set, namely, right front wheel solenoid valve V-FR1, left front wheel solenoid valve VFL, right rear wheel solenoid valve VRR1 left. Rear wheel solenoid valve V
RL is closed, and the drive of the motor M is brought to a halt in order to bring the compressor CP to a halt.

As described above, the control and stop device for vehicle height adjustment control of this embodiment uses the right front wheel vehicle height sensor FR1 disposed on the four wheels of the vehicle that detects the height between the axle and the vehicle body BO. High sensor RL, left front wheel height sensor FL, right rear wheel height sensor R
A vehicle height sensor such as R and the vehicle height sensor on the diagonal of the vehicle, for example, the sum of the output of the right front wheel vehicle height sensor FR and the output of the left rear wheel vehicle height sensor RL and the left front wheel. a vehicle height difference calculation means that calculates the difference between the output of the vehicle height sensor FL and the sum of the output of the vehicle height sensor RR of the right rear wheel; and a vehicle height difference obtained by the vehicle height difference calculation means and a predetermined threshold value. The vehicle height control device is provided with a comparison means for comparing the vehicle height and JH, and a control means for stopping the vehicle height adjustment control when it is determined from the output of the comparison means that the vehicle height difference is greater than a predetermined threshold vehicle height, JH. .

Therefore, vehicle height sensors such as the right front wheel height sensor FR, the left rear wheel height sensor RL, the left front wheel height sensor FL, and the right rear wheel height sensor RR, which are installed on the four wheels of the vehicle, are used to monitor the ground and the vehicle body. A vehicle height between 80 and 80 degrees can be detected as the height between the axle and the vehicle body BO. Using this, the vehicle height difference calculation means calculates the vehicle height difference between a pair of vehicle height sensors on the diagonal of the vehicle, and if the vehicle height of a specific pair of vehicle height sensors on the diagonal is larger than a predetermined value. For example, it can be determined from this that a particular wheel is riding on a curb of a predetermined size. Therefore,
The vehicle height difference calculated by the vehicle height difference calculation means is input to the comparison means, and the vehicle height difference is compared with a predetermined threshold vehicle height ΔH. When the comparison result of the comparing means determines that the vehicle height difference is less than the predetermined threshold vehicle height ΔH, the control means controls the right front wheel height sensor FR1, the left rear wheel height sensor RL, the left front wheel height sensor FL, and the right rear wheel. Vehicle height adjustment control is performed according to the output of a vehicle height sensor such as vehicle height sensor RR, and the vehicle height is set to a value that meets the conditions.

Furthermore, when it is determined that the vehicle height difference is equal to or greater than a predetermined threshold vehicle height, JH, based on the output of the comparison means, the vehicle height adjustment control of the control means is stopped.

Therefore, when the vehicle runs onto a step such as a curb, the vehicle height adjustment control can be stopped, and a situation where a part of the vehicle body 80 is damaged when getting off the curb does not occur.

Moreover, when the vehicle safely steps off the curb, it does not take time to reach a steady state.

In the above-mentioned embodiment, it is determined in step S51 whether a particular wheel is running over a step such as a curb, based on whether the current vehicle speed is below a predetermined threshold vehicle speed, for example, the reliability of the vehicle speed based on the accuracy of the vehicle speed sensor SS, etc. Based on the speed of 7 km/h or less or the output of the vehicle speed sensor SS, it is determined whether the vehicle is stopped or moving close to stopping.

However, when the vehicle is stopped, the determination can be made based on the output of the vehicle speed sensor SS, the ignition signal cycle, or the like. Alternatively, if a width-shifting operation is assumed, the vehicle speed may be limited to a predetermined threshold vehicle speed or less. Alternatively, it is also possible to assume the case of driving on a rough road.

By the way, the vehicle height difference calculation means for calculating the vehicle height difference between a pair of vehicle height sensors on the diagonal of the vehicle in the above embodiment is a means for determining whether the vehicle has run onto a curb, and is based on the output of the vehicle height sensor of the right front wheel and the left It is calculated based on the difference between the sum of the output of the rear wheel vehicle height sensor and the sum of the output of the left front wheel vehicle height sensor and the right rear wheel vehicle height sensor output, but when implementing the present invention, It is only necessary to use the vehicle height on one diagonal of the vehicle as a reference and calculate the slope of the vehicle height on the other diagonal. However, in particular, according to the calculating means of the above embodiment, it is possible to calculate a large difference in vehicle height between a pair of vehicle height sensors.

[Effects of the Invention] As described above, the control stop device for vehicle height adjustment control of the present invention uses vehicle height sensors disposed on the four wheels of the vehicle that detect the height between the axle and the vehicle body, and the vehicle height sensor that detects the height between the axle and the vehicle body. Compare the vehicle height difference obtained by a vehicle height difference calculation means that calculates the vehicle height difference between a pair of vehicle height sensors on the diagonal with a predetermined threshold vehicle height, and use the comparison output to determine whether the vehicle height difference is the predetermined threshold vehicle height. When it is determined that the above is the case, the vehicle height adjustment control is stopped.

Therefore, when a vehicle runs over a step such as a curb, it is detected by the vehicle height difference meter and stop means that calculates the vehicle height difference between the vehicle height sensor on the diagonal of the vehicle, and the magnitude of the vehicle height difference is detected. When the vehicle height is compared with a predetermined threshold vehicle height and the result is determined to be equal to or higher than the predetermined threshold vehicle height, the vehicle height adjustment control can be stopped. Therefore, a situation where a part of the vehicle body is damaged when getting off a step such as a curb does not occur. Furthermore, since unnecessary control is not performed when the vehicle runs onto a curb, it does not take time to reach a steady state when the vehicle steps off the curb.

Furthermore, the present invention is a control/stop device for vehicle height adjustment control that operates in accordance with the height between the axle and the vehicle body detected by the vehicle height sensor. Therefore, the control/stop device of the present invention can provide the same effect as in the case of a step difference even in vehicle height adjustment control caused by load imbalance.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a fluid control system and an electric control system of a control stop device for vehicle height adjustment control according to an embodiment of the present invention, and Fig. 2 is a diagram showing a control stop device for vehicle height adjustment control according to an embodiment of the present invention. 3 to 6 are flowcharts for main program control of the control circuit of the control stop device for vehicle height adjustment control according to an embodiment of the present invention, and FIG. FIG. 6 is a diagram showing the output state specifications of the control stop device for vehicle height adjustment control of the illustrated embodiment. In the figure, BO: Vehicle body, ECU: Control circuit, SS 2nd speed sensor, FR: Right front wheel height sensor, RL: Left rear wheel height sensor, FL: Left front wheel height sensor, RR: Right rear wheel height sensor. , is. In addition, in the figures, the same reference numerals and the same symbols indicate the same or equivalent parts. Patent applicant Aisin Seiki Co., Ltd.

Claims (2)

[Claims] (1) vehicle height sensors disposed on four wheels that detect the height between the axle and the vehicle body; and vehicle height difference calculation means that calculates the vehicle height difference between a pair of vehicle height sensors diagonally on the vehicle; a comparison means for comparing the vehicle height difference obtained by the vehicle height difference calculation means with a predetermined threshold vehicle height; and a vehicle height adjustment control when the vehicle height difference is determined to be greater than or equal to the predetermined threshold vehicle height based on the output of the comparison means. A control stop device for vehicle height adjustment control, comprising: a control means for stopping the vehicle height adjustment control. (2) The vehicle height difference calculating means for calculating the vehicle height difference between the vehicle height sensors on the diagonal line of the vehicle calculates the sum of the output of the vehicle height sensor of the right front wheel and the output of the vehicle height sensor of the left rear wheel. The control stop device for vehicle height adjustment control according to claim 1, wherein the control is calculated based on the difference between the output of the vehicle height sensor for the left front wheel and the output of the vehicle height sensor for the right rear wheel. .