JPH01145217A - Control suspending device in car height adjustment control - Google Patents

Abstract

PURPOSE:To dispose of the wheel slip, etc., by discharging the fluid pressure for a prescribed time and detecting the car height variation when a part of the car height is higher than the high car height region and suspending the car height adjustment control when the car height variation is below a pre scribed threshold value. CONSTITUTION:A control circuit 4 having the high, intermediate, and low car height selecting switches 1-3 connected receives each detection signal of a cars speed sensor 5 and the front/rear and right/left car height sensors 6-9, and outputs the respective control signals into a motor driving relay 10 and the front/rear and right/left fluid pressure control valves 11-14, and a discharge valve 15. Then, a compressor 17 is driven by a motor 16 and each fluid pressure is supplied into the front/rear and right/left suspensions 18-21. In this case, if a prescribed car height detection signal is higher than the high ground clearance region, the discharge valve 15 is opened for a prescribed time, and the car height variation at this time is detected. When the car height variation is smaller than a prescribed threshold value, the 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 in particular, a control stop of vehicle height adjustment control that is characterized by control when a wheel is jacked up or when a wheel comes off the wheel. It is related to the device.

[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 body direction increases, the vehicle body sinks, and when it 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. As an example of this, for example, JP-A-57-1189
One example is the technology published in Publication No. 07.

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 a vehicle height detected by a vehicle height sensor with a target vehicle height and controls the energization of a compressor and a valve means in a direction in which both of them match, the vehicle height control device depending on the vehicle speed. The target vehicle height is set based on the vehicle height.

[Problems to be Solved by the Invention] In the conventional vehicle height adjustment device as described above, an extra high region that is higher than the high vehicle height region where the vehicle height has been increased is set as a judgment for increasing the vehicle height. When the high sensor detected the extra high range, vehicle height adjustment was stopped. Therefore, there is a problem in that when the vehicle height sensor detects the extra high range even while the vehicle is running, the vehicle height adjustment is stopped.

One possible way to solve this problem is to continue control even if the vehicle height sensor detects the extra-high range while the vehicle is running. However, if such a method is adopted, if the wheels are spun while the wheels are being jacked up or the wheels are coming off, the vehicle height control system will determine that the vehicle is moving and each suspension will be controlled to lower the vehicle height. .

If the jack-up is released or the wheels come off in this state, there are problems such as the vehicle body tilting significantly and the suspension bottoming out.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a control stop device for vehicle height adjustment control that stops vehicle height adjustment control when the vehicle is jacked up or the wheels come off.

Means for Solving Problem E] The control and stopping device for vehicle height adjustment control according to the present invention includes a valve means for supplying and controlling fluid pressure of the suspension disposed on each wheel, and a valve means for controlling the supply and discharge of fluid pressure of the suspension disposed on each wheel, and Vehicle height change detection means that performs evacuation for a predetermined period of time when the vehicle height output of a vehicle height sensor disposed on a wheel that detects the height is higher than a high vehicle height region, and detects a vehicle height change at that time; When the output of the vehicle height change detection means is less than a predetermined vehicle height change, the vehicle height adjustment control is stopped.

[Operations] 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. When the vehicle height output of the vehicle height sensor is higher than the high vehicle height range, the valve means for controlling the discharge of fluid pressure from the suspension is opened to perform discharge for a predetermined period of time. At this time, the vehicle height change detection means detects the vehicle height change caused by the discharge for a predetermined time. Under normal conditions, if the fluid pressure is discharged, the vehicle height will be lowered, so when the output of the vehicle height change detection means is greater than a predetermined vehicle height change, vehicle height adjustment control is performed to determine a predetermined high vehicle height region. Choose a higher ride height. However, when the output of the vehicle height change detection means is less than a predetermined vehicle height change, there is no load on the wheels that should lower the vehicle height, for example, the wheels are floating in the air, and even if the vehicle is ejected, the vehicle will not move. It is assumed that the vehicle height is not lowering, and the vehicle height adjustment control is discontinued.

[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 control 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 ECLI. 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 ECLJ, thereby lowering the vehicle height. It is open when the switch is in use, and it is closed in the normal state.

The low vehicle height selection switch LOWSW, the intermediate vehicle height selection switch NORMAL SW, and the high vehicle height selection switch HIGH3W are vehicle height selection switches that select 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. Vehicle body B located between the axle and vehicle body BO
The right front wheel air suspension EFR, which supports the O, 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 CP 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 80 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 80, controls its vehicle height by supplied air pressure. The left front wheel solenoid valve VFL is the left front 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 system ERR, which is located between the axle and the vehicle body BO and supports the vehicle body 80, 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 CP 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 7 are flowcharts for controlling the main program of the control circuit ECLJ 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,
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.
tt). In step S2, an interrupt permission flag is set (set to "1").In step S3, it is determined that the timing for processing has arrived, and when the timing for predetermined processing has arrived, in step S4, the right front wheel height sensor FR is set. → Left rear wheel height sensor RL → Left front wheel height sensor FL → Right rear wheel height sensor RR. Call the data input routine that reads the vehicle height of the four wheels. This data input routine reads the vehicle height of each right front wheel. Sensor FR1 The outputs of the left rear wheel height sensor RL, left front wheel height sensor FL, and right rear wheel height sensor RR are used as serial signals, so the vehicle height of the four wheels is read in rotation. You can also read the vehicle height.

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 FR, 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, right front wheel valve VFR.

The left front wheel solenoid valve VFL, the right rear wheel solenoid valve VRR1, and the left rear wheel solenoid valve VRL are closed, and the drive 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 the vehicle speed data, the input of the low vehicle height selection switch L 0Il13 W or the intermediate vehicle height selection switch N0R) IAL SW or the high vehicle height selection switch HIGH3W, and the maximum and minimum vehicle height sensor values. A predetermined target vehicle height is selected using vehicle speed data, vehicle height selection switch input, and maximum and minimum values of vehicle height sensor values from a target vehicle height map created from road conditions based on differences in vehicle height values.

At step 311, the right front wheel lift request flag is set at step S.
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 ("091"), so in step 315 the calculated vehicle height calculated in step S8 is the target selected in step S10. Determine whether the calculated vehicle height is greater than or equal to the maximum value of the vehicle height. When the calculated vehicle height is greater than or equal to the maximum value of the target vehicle height, a right front wheel elevation request flag is set in step 316 (
(set to “1”). Further, in step S17, it is determined whether the Korean 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 B, set the right front wheel lowering request flag (set it to 1'').

From next time onwards, when the routine from step 311 to step 818 is entered, step 3 will be executed in step S11.
In step 312, the right front wheel raising request flag is set (set to "1") in step 16, and the right front wheel lowering request flag is set in step 818 (set to "1") in step 312. When the front wheel lowering request flag is set (“1”), step S1
In step 3, 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 when climbing over stones on the road surface. , step 314
Then, the right front wheel raise request flag set in step 316 (set to "1") or the right front wheel lower request flag set at step 31B (set to "1") is lowered (set to "Ote").

Further, in step 321, the left front wheel raising request flag is checked, and in step 322, the left front wheel lowering request flag is checked. At the beginning of this routine, the left front wheel up request flag and the left front wheel down request flag are down ("0"), so in step 325 the calculated vehicle height calculated in step S8 is the same as that selected in step S10. Determine whether the target vehicle height is greater than or equal to the maximum value. When the calculated vehicle height is greater than or equal to the maximum value of the target vehicle height, a left front wheel elevation request flag is set in step 326 (set to "1 pa").Furthermore, in step S27, 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 the minimum value of the target vehicle height, a left front wheel lowering request flag is set (set to "1") in step 328.

From next time onwards, when the routine from step 321 to step 828 is entered, step 3 will be executed in step S21.
26, and the left front wheel lowering request flag set in step 32B (setting ``1'') in step 322, the left front wheel raising request flag or the left When the front wheel lowering request flag is set (“1”), step S23
It is determined whether the condition 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. , step 32
4, set in step S26 (“1''
The left front wheel raising request flag (set to "1") and the left front wheel lowering request flag set in step 32B (set to "1 pa") are lowered (set to "0").

Similarly, for the right rear wheel, from step 331 to step 33B, for the left rear wheel, from step S41 to step 34B, 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 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 right front wheel down request flag, the left front wheel up request flag or left front wheel down request flag, and the right rear wheel up request flag, respectively. 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 Both the rear wheel up request flag and the left rear wheel down request flag are down (“091
), the routine starts from repeat step S3.

When any one of the all request flags is set (“1”) in step S50, it is determined in step 351 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 (set to "O") in step 855. Then, in step 356, it is confirmed that the control interruption flag has been lowered, and in step 357, 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 352 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 JH, and when the vehicle height difference stored in the vehicle height difference memory H is smaller than the predetermined threshold vehicle height ΔH, that is, If the vehicle height adjustment is working normally, proceed to step S.
At step 55, the control interruption flag is lowered to "0"), and then, through step 356, the process of the "vehicle height control routine" at step 357 described above is entered.

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 the vehicle height adjustment device performs undesirable control, a control interruption flag is set in step 354. (set as “1”), step 356
In step 358, it is confirmed that the control interruption flag is set, and in step 358, all solenoid valves, namely, right front wheel solenoid valve VFR1 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.

Furthermore, in step 361, from the outputs of the upper right front wheel height sensor R1, the left rear wheel height sensor RL, the left front wheel height sensor FL, and the right rear wheel height sensor RR, it is determined that the detected vehicle height is higher than the high vehicle height region. Determine whether it is in the extra high region. If the detected vehicle height is within the extra high range, it is stored in step 362 that the detected vehicle height is within the extra high range. When the detected vehicle height is not in the extra high range, it is determined in step 363 whether it is stored that the vehicle has entered the extra high range. If the detected vehicle height has never entered the extra-high region, the extra-high region has not been stored in step S62, so it is confirmed in step 374 that the storage of the extra-high region has been cleared, and the passage counter is set in step 375. Then, in step 876, the control interruption flag is lowered to "0"), and the routine starts from repeat step S3.

When it is determined in step S61 from the output of the vehicle height sensor that the detected vehicle height is in the extra high region higher than the high vehicle height region, the extra high region is stored in step S362. Then, in step 364, the exhaust solenoid valve EX and other right front wheel solenoid valves VFR1, left front wheel solenoid valves VFL1, and right rear wheel solenoid valves VRR.

By determining whether one of the left rear wheel solenoid valves VRL is open, it is determined whether exhaust is currently being performed.

At the beginning of this routine, exhaust is not in progress, so in step 365, the predetermined wheel, that is, the right front wheel air suspension EFR.

Right front wheel solenoid valve VFR1 Left front wheel solenoid valve V for left front wheel air suspension EFL, right rear wheel air suspension ERR, left rear wheel air suspension ERL
FL, right rear wheel solenoid valve VRR, left rear wheel solenoid valve VRL, and exhaust solenoid valve EX are opened to lower the fluid pressure of the air suspension of a predetermined wheel.

Thereafter, each time this routine is entered, if exhaust is in progress, an exhaust timer that measures exhaust time is incremented in step S66.

Furthermore, once it is determined in step 361 that the detected vehicle height is in the extra high region higher than the high vehicle height region, then in step 361 the target vehicle height is no longer in the extra high region higher than the high vehicle height region. In this case, through step 363, step 364 and step 36
Enter routine 6.

In step 367, it is determined whether the elapsed time of the exhaust timer that measures the exhaust time is 1 second or more. The routine from step S3 to step 367 is repeated to maintain this state until the elapsed time of the exhaust timer reaches 1 second or more.

When the elapsed time of the exhaust timer reaches 1 second or more, that is, when exhaust continues for 1 second, the exhaust timer is cleared in step S69, and the vehicle height when exhaust continues for 1 second is cleared in step S69. It is determined whether the change is less than the threshold vehicle height change Δh, and if the vehicle height change when exhausting continues for 1 second is greater than the threshold vehicle height change Δh, step 37
In step 4, the setting of the extra high area is canceled, in step 375 the pass counter is cleared, and in step 376
The control interruption flag is lowered (set to "Ome"), and the routine processing starts from repeat step S3.

If the change in vehicle height when the exhaust is continuously performed for 1 second in step 869 is less than the threshold vehicle height change Δh, step 37
Increment the passing counter by 0. Step 37
1, it is determined whether the value of the passage counter is equal to or greater than the threshold number of times N, and when the vehicle height change when the exhaust is continuously performed for one second is equal to or less than the threshold vehicle height change Δh and becomes equal to or greater than the threshold number of times N, step S72 Clear the passage counter in step 373
A control interruption flag is set (set to "1") at step 356, which is determined next time, and at step 858 all solenoid valves, that is, the right front wheel solenoid valve VFR, are set.
1 Close the left front solenoid valve VFL, the right rear solenoid valve VRR, and the left rear solenoid valve VRL, and stop driving the motor M to stop the compressor CP.

This stopped state occurs when it is determined in step 361 that the target vehicle height is not in the extra high region higher than the high vehicle height region, and furthermore, when it is determined in step 363 that the extra high region has been set and is not maintained. Alternatively, if the change in vehicle height when exhausting continues for T seconds in step 369 is less than the threshold vehicle height change Δh, step 376
When the control interruption flag is lowered (it becomes O$1), it is cleared by '.

As described above, the control and stopping device for vehicle height adjustment control of this embodiment includes the right front wheel height sensor FR and the left rear wheel height sensor RL, which are disposed on the wheels to detect the height between the axle and the vehicle body 80. , vehicle height sensors such as left front wheel height sensor FL, right rear wheel height sensor RR, and right front wheel air suspension EF arranged on each wheel.
R, front left wheel air suspension EFL, right rear air suspension ERR1 right front wheel solenoid valve VFR, which supplies fluid pressure from compressor CP to suspensions such as left rear air suspension ERL, or controls exhaust of fluid pressure from the suspension. The valve means such as the solenoid valve VFL, the right rear wheel solenoid valve VRR, the left rear wheel solenoid valve VRL, and the exhaust solenoid valve EX, and the vehicle height output of the vehicle height sensor are, for example, in an extra high region higher than the high vehicle height region. At this time, a vehicle height change detecting means detects a change in vehicle height at that time from the vehicle height sensor after exhausting the air for a predetermined time, that is, one second, and the output of the vehicle height change detecting means is a threshold vehicle height change, When Jh or less,
It consists of a control stop means for stopping vehicle height adjustment control.

Therefore, the right front wheel height sensor FR1 disposed on the four wheels
Vehicle height sensors such as a left rear wheel height sensor RL, a left front wheel height sensor FL, and a right rear wheel height sensor RR detect the height between the axle and the vehicle body OB as the vehicle height.

When the vehicle height output of the vehicle height sensor is in an extra high region higher than the high vehicle height region, a specific right front wheel air suspension EFR, a specific left front wheel air suspension EFL,
The valve means for controlling the discharge of fluid pressure from suspensions such as the right rear wheel air suspension ERR1 and the left rear wheel air suspension ERL is opened to discharge the fluid pressure for only one second. At this time, a change in vehicle height caused by the exhaust for only one second is detected by a vehicle height change detection means. Under normal conditions, if the fluid pressure is discharged, the vehicle height will be lowered, so when the output of the vehicle height change detection means is larger than the predetermined threshold vehicle height change Δh,
Vehicle height adjustment control selects a vehicle height higher than a predetermined high vehicle height range. However, when the output of the vehicle height change detection means is less than a predetermined threshold vehicle height change Jh, there is no load on the wheels that should lower the vehicle height, for example, the wheels are floating in the air and exhaust is not being performed. It is also assumed that the vehicle height is not lowering, and the vehicle height adjustment control is canceled.

Therefore, vehicle height adjustment control can be stopped when the vehicle is jacked up or the wheels come off, and normal vehicle height adjustment control can be resumed when the jacking up or wheels come off.

In addition, the right front wheel height sensor FR1, the left rear wheel height sensor RL, the left front wheel height sensor FL, which is disposed on the four wheels of the vehicle,
Vehicle height sensor such as right rear wheel vehicle height sensor RR measures the ground and vehicle body 8.
The vehicle height between 0 and 0 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, so that the vehicle height of a specific pair of vehicle height sensors on the diagonal is higher than a predetermined value. If it is large, it can be determined that the vehicle height adjustment device is performing undesirable control. Therefore, the vehicle height difference calculated by the vehicle height difference measuring means is input to the comparison means, and the vehicle height difference is compared with a predetermined threshold vehicle height dH. When the comparison result of the comparison 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 FR, the left rear wheel height sensor RL, the left front wheel height sensor FL, and the right rear wheel height sensor. Wheel height sensor R1 (
Performs vehicle height adjustment control according to the output of vehicle height sensors such as
Set the vehicle height to a value that meets the conditions. Further, when it is determined from the output of the comparison means that the vehicle height difference is greater than or equal to a predetermined threshold vehicle height ΔH, the vehicle height adjustment control of the control means is stopped.

Therefore, when the vehicle runs onto a step such as a curb, or when the load is extremely uneven, the vehicle height adjustment control can be stopped, and the vehicle height adjustment device does not perform undesirable control. Furthermore, when the vehicle gets off a step or when the unevenness of the load is not resolved, it does not take time to reach a steady state.

In addition, in the above embodiment, since an air suspension is used as the suspension that supplies fluid pressure, air is used as the fluid, but when carrying out the present invention, the present invention is not limited to gases such as air. The use of liquids is also possible.

[Effects of the Invention] As described above, the control and stop device for vehicle height adjustment control of the present invention has a valve means for supplying fluid pressure from a compressor to the suspension disposed on each wheel or for controlling discharge of fluid pressure from the suspension. Then, when the vehicle height output of the vehicle height sensor installed on the wheel that detects the height between the axle and the vehicle body is higher than the high vehicle height range, the vehicle is discharged for a predetermined period of time, and the change in vehicle height at that time is detected. and a control stopping means that stops the vehicle height adjustment control when the output of the vehicle height change detection means is equal to or less than a predetermined threshold vehicle height change.

Therefore, the vehicle height is detected by vehicle height sensors disposed on the four wheels, and when the vehicle height output of the vehicle height sensor is higher than the high vehicle height region, the valve means for controlling the discharge of fluid pressure from a specific suspension is activated. The system is opened and discharged for a predetermined period of time. At this time, a change in vehicle height caused by the exhaust for a predetermined period of time is detected by a vehicle height change detection means. When the output of the vehicle height change detection means is less than or equal to a predetermined threshold value of vehicle height change, the vehicle height may be lowered even if the vehicle height is lowered. It is assumed that the vehicle is not lowering, and the vehicle height adjustment control is discontinued. Therefore,
The vehicle height adjustment control can be stopped only when the vehicle is jacked up and the wheels come off, and when the jacking is canceled or the wheels come off, the vehicle height adjustment control can be restarted.

[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. FIGS. 3 to 7 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: Vehicle speed sensor, CP: Compressor, EFR: Right front wheel air suspension, EFL: Left front wheel air suspension, ERR: Right rear wheel air suspension, ERL: Left rear wheel air suspension. , VFR: Right front wheel solenoid valve, VFL: Left front wheel solenoid valve, VRR: Right rear wheel solenoid valve, VRL: Left rear wheel solenoid valve, EX: Exhaust solenoid valve, FR: Right front wheel height sensor, RL: Left rear wheel wheel height sensor; FL: left front wheel height sensor; RR: right rear wheel height sensor. 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 installed on the wheels that detect the height between the axle and the vehicle body, and valves installed on each wheel that supply fluid pressure from the compressor to the suspension or control the discharge of fluid pressure from the suspension. means, vehicle height change detection means for performing exhaust for a predetermined period of time and detecting a change in vehicle height at that time when the vehicle height output of the vehicle height sensor is higher than a high vehicle height region; and the vehicle height change detection means. A control stopping device for vehicle height adjustment control, comprising: control stopping means for stopping vehicle height adjustment control when the output of the vehicle height adjustment control is equal to or less than a predetermined threshold value of vehicle height change. (2) Vehicle height adjustment according to claim 1, wherein the vehicle height change detection means performs the discharge for a predetermined period of time by repeating the discharge a plurality of times and detecting the vehicle height change at that time. Control control stop device.