JPH01293213A - Vehicle height adjustment system - Google Patents

Abstract

PURPOSE:To minimize an actuation frequency and reduce a control time by making it a standard that the control to one vehicle height adjustment part is to be continued until the control to the said adjustment part is completed in the control of the pressure supply and discharge device of a supply and discharge control means, and making a simultaneous control only when receiving the other signal the same as the control in operating. CONSTITUTION:A detected vehicle height is inputted in a vehicle height adjustment control device 10 from each vehicle height detection means 2, the necessity of a vehicle height adjustment is judged, and a compressor 3, exhaust valve 4, and supply and discharge valve 5 are controlled. At that time, the control is continued until one vehicle height adjustment is completed, and a next control is made after the control finishes. Provided that when another control received during one control requests the same vehicle height adjustment as the present control, the control for the other vehicle height adjustment request is concurrently made. This constitution enables an actuation frequency to be minimized, and a control time reduced.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention provides a single pressure supply/discharge device for supplying pressure (air supply) or discharging pressure (air exhaust) to at least two or more vehicle height adjustment parts. ), the vehicle height adjustment system can adjust the height of the vehicle, and smooth this adjustment when pressure adjustment requests (air supply requests or exhaust requests) from each vehicle height adjustment part conflict. This invention relates to a vehicle height adjustment system that can be adjusted.

"Prior Art" The prior art is as seen in Japanese Patent Publication No. 62-9045.

Conventional vehicle height adjustment systems use pressure supply means (e.g., compressor, supply/discharge valve) to raise the vehicle height when the vehicle height is outside the standard vehicle height range, and pressure discharge means (for example, a compressor, supply/discharge valve) to lower the vehicle height.
For example, the vehicle height is adjusted by operating either one of the exhaust valve and supply/exhaust valve to displace the vehicle height within a vehicle height reference range.

By the way, if there are multiple vehicle height adjustment parts (for example, front air suspension suspension and rear air suspension), it is unlikely that their vehicle heights will change in the same way. Conflicting changes such as one being higher than the standard vehicle height and the other being lower than the standard vehicle height may occur at the same time. To adjust the vehicle height at this time, one vehicle height adjustment section is exhausted to achieve the standard vehicle height, and the other vehicle height adjustment section is supplied with air to achieve the standard vehicle height. The device cannot make this adjustment at the same time. For this purpose, in the conventional example, a logic circuit serving as a priority determining means is provided.

"Problem to be Solved by the Invention" When the priority determining means in the prior art described above is set to give priority to air supply request control, for example, when the front air suspension is at a high vehicle height and the exhaust 'M' control is already being controlled. has started, and while this front side exhaust control is being executed, the rear air suspension becomes low vehicle height and a rear air supply request occurs. The front side exhaust control is temporarily stopped, and the rear side air intake control is prioritized and controlled until it is completed. Then, after the rear side air intake control is completed, the front side exhaust control is started again. Therefore, in this case, the front side exhaust control has to be started, interrupted, restarted, and completed, resulting in a problem that the number of operations of the exhaust valve, supply/exhaust valve, etc. increases, and the control time becomes long.

When priority is given to exhaust, the same applies to the compressor and supply/discharge valve that supply air.

ri? ! In order to solve the above problems, the present invention provides two or more vehicle height adjustment sections and a single pressure supply that supplies and discharges pressure to each of the vehicle height adjustment sections. a vehicle height detection means for detecting the vehicle height in each of the vehicle height adjustment sections; and a vehicle height detection means for detecting the vehicle height in each of the vehicle height adjustment sections; In a vehicle height adjustment system for a vehicle, which includes a vehicle height adjustment control device that controls a pressure supply/discharge device, the vehicle height adjustment control device receives signals from each of the vehicle height detection means, and detects when the vehicle height is low. A pressure supply signal is received in the case of a high vehicle height, and a pressure discharge signal is received in the case of a high vehicle height. , starts controlling the pressure supply/discharge device for the one vehicle height adjustment section based on the reception of the one signal, and if another signal identical to the one signal is received during the control, the other signal is When the control of the pressure supply/discharge device for the vehicle 11a adjustment section is started and another signal that contradicts the one signal is received, the control of the other vehicle height adjustment section is started after the control for the one vehicle height adjustment section is completed. The present invention is characterized in that it includes a supply/discharge control means for starting control of the pressure supply/discharge device to the adjustment section.

"Function" In the vehicle height adjustment "M control device, the vehicle height determination means receives a signal from the vehicle height detection means, and when each vehicle height adjustment section is at a low vehicle height, a pressure supply signal is sent to the vehicle height adjustment section. When each vehicle height adjustment section has a high vehicle height, a pressure discharge signal is generated for each vehicle height adjustment section.A supply/discharge control means that individually receives each signal from the vehicle height determination means is provided. Once the control of the pressure supply/discharge device for the first vehicle height adjustment section is started based on the signal, the basic operation is to continue this until the end, and when another signal is received during this control, this is the first signal. is the same, the control of the pressure supply/discharge device for the other vehicle height adjustment section is started without waiting for the completion of the control for the first vehicle height adjustment section, and if this conflicts with the first signal, the After the control for one vehicle height adjustment section is completed, control of the pressure supply/discharge device for the other vehicle height adjustment section is started.

"Example" An example of the present invention will be described based on FIGS. 1 to 4.

FIG. 1 is an overall layout diagram showing an embodiment of a vehicle height adjustment system for a four-wheeled vehicle. FIG. 2 is a system configuration block diagram of an embodiment of the present invention. FIG. 3 is a flowchart showing the control configuration of the supply/discharge control means according to an embodiment of the present invention.

FIG. 4 is a flowchart showing a control configuration in the vehicle height determining means according to an embodiment of the present invention. FIGS. 5(A) to 5(C) are time charts showing the actions of the supply/discharge control means and the vehicle height determination means according to an embodiment of the present invention.

In Figure 1, IF, IF, IR, IR (total 1) are air suspension (vehicle height adjustment section), 2F
, 2R (total number 2) is the vehicle height detection means, 3
is a compressor (pressure supply means), 4 is an exhaust valve (pressure discharge means), and 5F.

5F, 5R, and 5R (total number 5) are supply/discharge valves, 6 is a dryer, and 7 is a pressure pipe.

Here, the compressor 3, exhaust valve 4, and pulp supply/discharge 5 constitute a pressure supply/discharge device for the air suspension 1.

The air suspension 1 is a front air suspension 9 installed on the left and right sides of the front side of the vehicle.
F, and rear air suspensions IR2IR, which are installed on the left and right sides of the rear side of the vehicle. The front air suspension 9 IF and IF and the rear air suspension IR and IR are each paired to adjust the pressure, and the front air suspension I
The pressures of F, IF and rear air suspensions IR, IR are adjusted independently of each other. That is, in this example,
There are two vehicle height adjustment parts: the left and right front air suspensions and the left and right rear air suspensions. The vehicle height detection means 2 is a front vehicle height detection means 2 provided near the right front air suspension IF.
F and a rear vehicle height detection means 2R installed near the right rear air suspension IR, each of which detects the vehicle height of the front air suspension and rear air suspension 9 in a stepwise manner. For example, it is used to detect low vehicle height, standard vehicle height, and high vehicle height, and in reality, it may be provided inside the near suspension ventilator 1, or it may be provided adjacent to the outside of the air suspension 1. You can.

The compressor 3 is composed of a compressor motor 3A composed of an electric motor and an electromagnetic relay 3B. The compressor 3 is driven by a compressor motor 3A and supplies pressure (air) to the air suspension 1 via a pressure pipe 8 in order to increase the vehicle height. The exhaust valve 4 is composed of an electromagnetic solenoid, and is connected from the air suspension 1 to the pressure pipe 8 in order to lower the vehicle height.
This is for discharging pressure to the atmosphere through the

The supply/discharge valve 5 is composed of an electromagnetic solenoid, and is provided with front supply/discharge valves 5F, 5F provided close to the left and right front air suspensions IF, respectively, and to the left and right rear air suspensions IR, IR, respectively. It consists of rear side supply/discharge valves 5R, 5R which are provided in close proximity. The supply and exhaust valve 5 is closed and sealed when the air suspension 9-1 is at the standard vehicle height, and is opened when the air suspension 9-1 is supplied or exhausted.

In FIG. 2, 8 is a battery, 9 is an ignition switch, and 10 is a vehicle height adjustment control device. The battery 8 is installed in a four-wheel vehicle or the like, and the above-mentioned pressure supply/discharge device (compressor 3, exhaust valve 4, and supply/discharge valve 5) is driven by the power supplied from the battery 8.

In addition, by turning on the ignition switch 9,
Electric power from the battery 8 is supplied to a vehicle height adjustment control device 10 and the like.

The vehicle height adjustment control device 10 includes an input interface 10B, RAM10C, ROM10r), and CP TJ10F.
, and an output interface IOF, and is provided with a power supply circuit 10A for stably supplying power from the battery 8 to each of the above-mentioned devices constituting the vehicle height adjustment control device 10.

And input interface IOB, RAMIQC, R
OM10r) and output interface 10F are each CPTJIOF by the system path.

is connected to.

The input interface IOB is connected to the front and rear vehicle height detection means 2, and the vehicle height detection signal consisting of low vehicle height, reference vehicle height, or high vehicle height is input to the front vehicle height signal S1 and the rear vehicle height signal. s2, respectively.

On the other hand, the output interface IOF includes a compressor 3 and an exhaust valve 4 that constitute a pressure supply and discharge device, as well as vehicle height adjustment units IF, IF, IR,
Supply/discharge valves 6F, 6F, and 6R attached to each IR
, 6R are connected to 11 controlled devices. The compressor 3 is driven/stopped based on the 0N10FF signal output as the square supply signal S3 from the output interface IOF! ! 1fl, and the exhaust valve 4 is
The valve opening/closing is controlled based on the ON10F F signal outputted as the pressure discharge signal S4 from the output interface IOF, and the front side supply/discharge valves 5F, 5F and the l/A side supply/discharge valves 5R, 5R are connected to the output interface. IOF
The valve opening/closing control is performed based on the 0N10FF signal outputted as the front side supply/discharge valve opening/closing signal S5 and the rear side supply/discharge valve opening/closing signal S6.

The RAM 10C is provided as a data memory and has a data area M, which will be described later. And data area M
has the following areas, which are designed to store the following data.

■Counter area Mc: When determining the vehicle height, it is time to take in the front vehicle height signal S1 supplied from the front vehicle height detection means 2F, or from the rear vehicle height detection means 2R. This is a counter for measuring whether it is time to take in the rear side vehicle height signal S2, and the counter data C is the update record t.
e will be done.

■Current front vehicle height data area Mhf...Based on the counter data C of the counter area Mr, the newly imported front side vehicle height signal S1 is stored as the current front vehicle height data h. .

■This time rear vehicle height data area Mhr...Based on the counter data C of the counter area Mc, the newly imported rear vehicle height signal S2 is the current rear vehicle height data h,
It will be remembered as.

■Previous front vehicle height data area Mf...When newly capturing the front side vehicle height signal s1 based on the counter data C of the counter area MO, the current front vehicle height data area Mhf that has already been stored in the current front vehicle height data area Mhf. Front side vehicle height signal 31 as front vehicle height data h
is stored as the previous F vehicle height data f.

■Previous rear vehicle height data area Mr...the above counter,
When the rear side vehicle height signal S2 is newly taken in based on the counter data C of the area Me, the rear side vehicle height signal S2 is used as the current rear vehicle height data h1 already stored in the current rear vehicle height data area Mhr. is stored as the previous rear vehicle height data r.

■Front timer area Mtf...front m car st
This is a timer for measuring how long the same vehicle height detection signal is continuously supplied from the detection means 2F as the front side vehicle height signal S1, and timer data Tf is updated and stored.

■Rear timer area Mtr...Rear side vehicle height detection means 2
This is a timer for measuring how long the same vehicle height detection signal is continuously supplied from R as the rear vehicle height signal S2, and timer data Tr is updated and stored.

■Discrimination reference time area Mtc...Is the front vehicle height or the rear vehicle height not instantaneous, but is in a low vehicle height state or high vehicle height state that requires vehicle height adjustment in near suspension vehicle 1? In order to determine, the reference time for continued supply of the low vehicle height or high vehicle height detection signal is the determination reference time data Tc,
This is where it is remembered.

■Front air supply request area Mfi... When the front air suspension IF is in a low vehicle height state and it is necessary to supply compressed air by driving the compressor 3, the front air supply request flag Fi is set and the front air suspension Venge layer IF is in standard vehicle x state or high vehicle height state,
This is a flag area where the front air supply request flag Fi is cleared when there is no need to supply compressed air by driving the compressor 3, and stores whether or not it is necessary to supply compressed air to the front side air suspension IF. By the way.

[Phase] Front m air requirement area Mfo... When the front side air suspension controller IF is in a high vehicle height state and it is necessary to discharge air by opening the exhaust valve 4, the front exhaust requirement flag Fo is set. This is a flag area where the front exhaust request flag Fo is cleared when the front air suspension system IF is in the standard vehicle height state or the low vehicle height state and there is no need to discharge air by opening the exhaust valve 4. This is where it is stored whether or not it is necessary to exhaust air from the Air Suspension Man IF.

■Rear air supply request area M r i...When the rear air suspension system IR is in a low vehicle height state and compressed air needs to be supplied by driving the compressor 3, the rear air supply request flag Ri is set. , front side air suspension 9
This is a flag area where the rear air supply request flag R4 is cleared when the engine IF is in the standard vehicle height state or the high vehicle height state and there is no need to supply compressed air by driving the compressor 3. This is where it is stored whether or not it is necessary to supply compressed air.

■Rear exhaust request area Mro...When the rear air suspension 1 IR is at a high vehicle height and it is necessary to exhaust air by opening the exhaust valve 4, the rear exhaust request flag Ro
is set, the rear air suspension engine IR is in the standard vehicle height state or low vehicle height state, and when there is no need to discharge air by opening the exhaust valve 4, this is the flag area where the rear exhaust request flag Ro is cleared. This is where it is stored whether or not it is necessary to exhaust air from the rear air suspension 3-IR.

■Reference vehicle height determination Reference time area Mtn... Determines whether the front vehicle height or rear vehicle height is not instantaneous and is in a reference vehicle height state that does not require vehicle height adjustment in air suspension 1. Therefore, the reference time for continued supply of the reference vehicle height detection signal is stored as the determination reference time data Tn.

■Air suspension total number area Ma...This is where the total number a of air suspensions 1 that are adjusted independently is stored.In this example, the front air suspension IF and the rear air suspension IF are stored. Suspension IR
Since these are adjusted independently, the total number data a is stored as 2.

[Phase] Compressor operation confirmation area Mi...Is the compressor 3 in the operating state (ON state) or in the stopped state (
OFF status! It is a place to remember what is in the
A compressor operation flag I is set when the engine is in operation, and a compressor operation flag r is cleared when the engine is stopped.

[Phase] Exhaust valve operation confirmation area Mo...Check whether the exhaust valve 4 is in the open state (ON state) or in the closed state (OFF state)
By the way, when the valve is in the open state, the exhaust valve operation flag 0 is set, and when the valve is in the stopped state, the exhaust valve operation flag O is cleared.

O Front supply/exhaust valve operation confirmation area M f v...
It stores whether the front side supply/discharge valve 5F is in an open state (ON state) or a closed state (OFF state), and when the front side supply/discharge valve 5F is in an open state, the front supply/discharge valve operation flag Fv is set. is set, and when the valve is in the closed state, the front supply/discharge valve operation flag Fv is cleared.

[Phase] Rear supply/discharge valve operation confirmation area Mrv: This is where you remember whether the rear supply/discharge valve 5R is in the open state (ON state) or the closed state (OFF state). Rear supply/discharge valve operation flag R when in valve state
v is set and the rear supply/discharge valve operation flag Rv is cleared when the valve is in the closed state.

On the other hand, the ROM 10D is provided as a program memory, and the program stored in the ROM 10D executes the CP IJ 10 F based on the data area M provided in the RAM 10C.

is the compressor 3, exhaust valve 4, supply/discharge valve 5, etc. connected via the output interface 10F.
The configuration is such that the vehicle height determination process and supply/exhaust control process shown in FIGS. 3 and 4 are performed on the GA device.

(1) Vehicle height determination process (interrupt process) In FIG. 4, first, in order to determine whether it is time to take in the front vehicle height or the time to take in the rear vehicle height,
c, reads counter data C from (step 311
). Then, it is determined whether the counter data C is c,=O (step 512). If c=0 then F
The vehicle height is acquired (Step 5TFI), and if c=1, the R vehicle height is acquired (Step 5TRI).

(1-1) Front vehicle height acquisition processing (c = 05c,
= If determined as O, the current front vehicle height data h and the previous front vehicle height data f are stored in the previous front vehicle height data area Mf, and are also supplied from the front side vehicle height detection means 2F via the input interface IOR. Read the front side vehicle height signal S1 to be displayed, and input the vehicle height detection signal consisting of low vehicle height, reference vehicle height, or high vehicle height to the current front vehicle height data area Mhf.
It is set as t@shi (step 5TFI). Then, in order to determine whether or not the front vehicle height data f from the previous time (the front vehicle height capture time immediately before the current front vehicle height capture time) is the same as the front vehicle height data h read this time. , reads the previous front vehicle height data f from the previous front vehicle height data area Mf, reads the current front vehicle height data h from the aforementioned current front vehicle height data area Mhf, and compares the same previous front vehicle height data f and the current front vehicle height. Compare the data hf (step 5IF
2).

If r=h, that is, the previous front vehicle height data f and the current front vehicle height data hf are equal, the front timer data Tf-t- is obtained from the front timer area Mtf.
1, the front timer data Tf is counted up by +1, and the memory is updated (step 5TF3). f≠h1
That is, if the previous front vehicle height data f and the current front vehicle height data h are different, the front timer data Tf in the front timer area Mtf is cleared (step 5IF4), and the process moves to step ST3, which will be described later.

In step 1rF2, if it is determined that f=h, that is, the previous front vehicle height data f and the current front vehicle height data h are equal, the current front vehicle height data h is data indicating a low vehicle height. Determine whether or not (step 5T)
FIO). As a result, if it is determined that the current front vehicle height data h does not indicate a low vehicle height, it is determined whether the current front vehicle height data hf indicates a high vehicle height (
Step 5TF20). As a result, if it is determined that the current front vehicle height data hf does not indicate a low vehicle height, nor does it indicate a sub-vehicle height, but the current front vehicle height data hf indicates the standard vehicle height, Step 5IF3 described below
Move to 0.

This time, if it is determined that the front vehicle height data he indicates a low vehicle height in step 5IF10, after clearing the front exhaust request flag Fo that requests different processing from the case of low vehicle height (step 5IFII), In order to determine whether or not the vehicle height continues to be low in the vehicle IF, the determination reference time data Tr is read from the aforementioned front timer data Tf, the determination reference time area Mtr, and the determination reference time area Mtr.

(For example, a value equivalent to 1 Osec) is compared in size (step S T F 12). As a result, when the value of the front timer data Tf reaches Tc, that is, it is determined that the low vehicle height has continued for 10 seconds in the front air suspension IF, the front air supply request area M f i front air supply request flag Fi (Step 5TF13). The value of front timer data Tf is Tc
In other words, the front air suspension IF
If it is determined that the low vehicle height has not continued for 10 seconds or more, the process moves to step 313, which will be described later.

If it is determined that the front vehicle height data h indicates a high vehicle height at step 5TF20, after clearing the front air supply request flag Fi which requests processing different from the case of high vehicle height (step 5TF21), the front side In order to judge whether the high vehicle height continues in the air suspension type IF, the above-mentioned front timer data Tf and the discrimination reference time data Tc read from the discrimination reference time area Mtc.

(For example, a value equivalent to 10 seconds) is compared in size (Step 5TF22). As a result, when the value of the front timer data Tf reaches Tc, that is, when it is determined that the high vehicle height has continued for 10t61S17#1 in the front air suspension engine IF, the front exhaust request flag Fo is set in the front exhaust request area Mfo. Set (Step 5)
IF23). If it is determined that the value of the front timer data Tf does not reach Tc, that is, the high vehicle height does not continue for 10 seconds or more in the front air suspension IF, the process moves to step ST3, which will be described later.

This time, the front vehicle height data h is step 5IF10.2
When the reference vehicle height is determined as 0, the front timer data Tf is used to determine whether the reference vehicle height continues at the front side air suspension IF.
and the discrimination reference time data Tn (for example, a value equivalent to 2 seconds) read from the reference discrimination reference time area Mtn are compared in size (step 5TF30). As a result, when the value of the front timer data Tf reaches Tn, that is, when it is determined that the reference vehicle height has continued for 2 seconds in the front air suspension IF, the front air intake request area and the front exhaust request area Mfo are The air supply request flag Fi and the front exhaust request flag Fo are cleared (step 5JF31).

The value of front timer data Tf has not reached Tn.
That is, if it is determined in the front air suspension IF that the reference vehicle height has not continued for two seconds or more, the process moves to step SI3, which will be described later.

(1-2) Rear vehicle height acquisition process (c=1) (1-1) Each step in the front vehicle height acquisition process and each step in the rear vehicle height acquisition process are completely Therefore, a description of the processing procedure for rear vehicle height import processing will be omitted.

(1-3) Next vehicle height acquisition determination process When the (1-1) front vehicle height acquisition process or (1-2) rear vehicle height acquisition process is completed, the process moves to step Si, and the above-mentioned counter area M c, +1 counter data C
Count up (Stella 7"S I 3). Then, read out the total number data a=2 of the air suspension 9-1 (vehicle height adjustment part) from the air suspension 9-1 total number area Ma, and check whether C≧a=2. Make a judgment as to whether or not (Step 5)
I4).

If counter data C≧2, counter data C is
Clear Step SI 5, and in the next interrupt, perform front vehicle height acquisition processing (c, = 0). If the counter data r, = l, the counter data C is not cleared to 0, and the rear vehicle height acquisition process (c,
= 1).

(2) Front air supply/exhaust control processing (front air suspension IF side) In Fig. 3, first check whether the front air supply request flag Fi is set, that is, the air supply on the front air suspension IF side. It is determined whether a request has occurred (step 5FIO). As a result, if it is determined that the front air supply request flag Fi is cleared, that is, no air supply request is generated on the front side air suspension IF side, the front exhaust request flag F is set.

It is determined whether or not is set, that is, whether or not an exhaust request is generated on the front air suspension IF side (step 5F20).

As a result, if it is determined that the front exhaust request flag Fo is cleared, that is, no exhaust request is generated on the front side air suspension IF side, the process moves to step 5F30, which will be described later.

(2-1) Front air supply request processing In FIG. 3, first, the front air supply request flag Fi
is set in step 5F10, that is, if it is determined that an air supply request is occurring due to the low vehicle height on the front side air suspension IF side, the compressor 3
(Compressor motor 3A) is already 0N10FF, that is, the compressor 3 has already been turned on (operated) due to the air supply request on the front side air suspension ventilation IF side or the rear side air suspension IR side that occurred earlier. In order to determine whether or not the compressor is in operation, the compressor operation flag (■) is read out from the compressor operation confirmation area M+, and it is determined whether or not the compressor operation flag (■) is set and in operation (step 5F11). As a result, if the compressor operation flag ■ is cleared and it is determined that it is in the stopped state, the exhaust valve 4 is already 0N10.
In order to determine whether the exhaust valve 4 is already ON (open) due to the exhaust request on the rear side air suspension or IR side that occurred earlier, the exhaust valve operation is confirmed. The exhaust valve operation flag 0 is read from the area Mo, and it is determined whether the exhaust valve operation flag O is set and the valve is open (step 5F1).
2). The compressor operation flag r is set in step 5 FII, that is, the compressor 3 has already been turned on due to the air supply request from the front air suspension IF side or the rear air suspension engine IR side that occurred earlier.
(operating), step 5F described below.
Move on to 14.

Exhaust valve operation flag O is cleared in step 5F12 (
In other words, the front air suspension IF side or the rear air suspension IR side have both been at the standard vehicle height state, so the exhaust valve 4 is in the closed state and the compressor 3 is not activated. When this occurs, the aforementioned pressure supply signal S3 is output and the compressor 3 (
Operate the compressor motor 3A) and
The fact that the compressor is in operation is memorized by setting (ON) the compressor operation flag (Step 5F1).
3). The exhaust valve operation flag O is set (ON) in step 5F12, that is, the exhaust valve 4 has already been opened due to the exhaust request on the rear air suspension IR side that occurred earlier, and the exhaust valve 4 has already been opened due to the exhaust request on the rear air suspension 9 IR side. If it is determined that the exhaust treatment is still being performed on the side,
Because the exhaust on the rear air suspension 9 IR side (rear exhaust due to R exhaust request) is not stopped, that is, it continues regardless of the air supply request (front air supply request) on the IF side of the front air suspension 9. , step 5RI
Move to O.

After completing steps up to step 5F13, step 5F14
Next, check whether the front supply/discharge valve 6F is already 0N10FF, that is, whether the front supply/discharge valve 6F has already been turned on (opened) due to the pressure adjustment request on the front side near suspension IF side that occurred earlier. In order to determine whether or not the front supply and exhaust valve operation check area M
The front supply and discharge valve operation flag Fv is read from fv, and the front supply and discharge valve operation flag Fν is set (ON).
A determination is made as to whether or not it is true (step 5F14).

As a result, the front supply/discharge valve operation flag Fv is cleared (OFF), that is, the front supply/discharge valve 6F
However, since a new pressure adjustment request has been confirmed this time, if it is determined that there is no pressure adjustment request from the front side air suspension IF side and it is still 0FF (valve closed), the front supply/discharge valve open/close signal S5 is opened. A valve signal is output to turn on the front supply/discharge valve 6F, and the fact that the front supply/discharge valve opening/closing signal S5 is ON is stored by setting (ON) the front supply/discharge valve operation flag Fv (step 5F15). The front supply and discharge valve operation flag Fv is set (ON) in step 5F14, that is, the front supply and discharge valve 6F is set to the front side air suspension q.
If it is determined that the air suspension is already ON (open) due to the pressure adjustment request generated earlier on the air suspension IF side, the process moves to step 5RIO in order to receive the same pressure adjustment request on the rear air suspension IR side.

(2-2) Front exhaust request processing (2-1) Each step in the front air supply request processing and each step in the front exhaust request processing completely correspond to each other as shown in Fig. 3. A description of the procedure for exhaust request processing will be omitted.

(2-3) Front standard vehicle height processing Both the front air supply request flag Fi and the front exhaust request flag Fo are cleared, that is, the front air suspension IF side is already at the standard vehicle height.
If it is determined in step 5F10 and step 5F20 that no pressure adjustment request has occurred for the front side air suspension IF side, the process moves to step 5F30, and the front air suspension request area M f i and the front exhaust request area Mfo are , front air supply request flag Fi1
Both front exhaust request flags Fo are cleared (step 5F30). Next, turn off the front supply/discharge valve opening/closing signal S5 to turn off the front supply/discharge valve 6F.
(closed), and the fact that the front supply and discharge valve 6F is in the closed state is memorized by clearing (OFF) the front supply and discharge valve operation flag Fv in the front supply and discharge valve operation confirmation area Mfv (step 5F31). .

Here, check whether the rear supply/exhaust valve 6R is already 0N10FF, that is, whether the vehicle height adjustment on the rear air suspension ventilation eIR side, which is being executed based on the same pressure adjustment request, has already been completed. Or, in order to determine whether the vehicle height adjustment process on the rear air suspension IR side based on the same pressure adjustment request is still being executed, check the rear supply and exhaust valve operation from the rear supply and exhaust valve operation confirmation area Mrv. The flag Rv is read and it is determined whether the rear supply/discharge valve operation flag Rv is set (ON) (step 5F32). As a result, if it is determined that the rear supply and exhaust valve operation flag Rv is not cleared (OFF), the pressure supply signal S3 and the pressure discharge signal S4 are turned OFF, and the compressor 3 (compressor motor 3A) and exhaust valve 4 are turned off. OFF, pressure supply signal S
3 and the pressure discharge signal S4 are OFF in the compressor operation confirmation area Mi1 and the exhaust valve operation confirmation area M.
It is memorized by clearing (OFF) the compressor operation flag ■ and the exhaust valve operation flag O of o (step 5F33, step 5F34). When it is determined that the rear supply/exhaust valve operation flag Rv is set (ON) in step 5F32, that is, the vehicle height adjustment on the rear air suspension IR side is still being performed, the rear air suspension valve operation flag Rv is In order to continue the vehicle height adjustment on the side, the process moves to step 5RIO.

(3) Rear air supply and exhaust control processing (rear side air suspension ventilation I)
(R side) (2) Each step in the front supply/discharge control process and each step in the rear supply/discharge control process completely correspond to each other as shown in Figure 3, so the processing procedure for the rear supply/discharge control process The explanation of is omitted.

The operation of the embodiment configured as described above is shown in Fig. 5 (
The explanation will be based on (a) to (c).

FIG. 5(A) shows (Case
) FIG. Figure 5 (b)
1 is a time chart diagram showing the effect of (case ①) described later in one embodiment of the present invention. FIG. 5(C) is a time chart showing the operation of (Case 2), which will be described later, in one embodiment of the present invention.

(Case ■) Case ■ shown in FIG. 5(a) is a case where the front side and rear side require vehicle height adjustment at different times. In this case, in the vehicle height adjustment control device 10, when the supply and exhaust control means receives, for example, a front side pressure signal from the vehicle height determination means, the front air supply request flag Fi, the front supply and discharge valve operation flag Fv, and the compressor operation flag are set. ■
Based on the set of, front side air suspension ventilation IF
This indicates that once the compressor 3 has started driving, it will continue until completion. Incidentally, when the low vehicle height occurs only momentarily, the front air supply request flag Fi is not set.

In other words, the transient low vehicle height is determined to be a low vehicle height that does not require air supply.

(Case ■) Case ■ shown in FIG. 5(b) is a case where the front side and the rear side require the same vehicle height adjustment request at the same time. In this case, in the vehicle height adjustment control device 10, for example, when the front side air supply is being controlled as described in the above (case When received, the rear air supply request flag R
i and the rear air suspension valve operation flag Rν, the rear air suspension 1 IR is activated without waiting for the completion of air supply control for the front air suspension IF, that is, the front air suspension valve operation flag Fν is cleared. Air supply to the vehicle starts by opening the rear supply/discharge valve 5R.

(Case ■) Case ■ shown in FIG. 5(C) is a case where conflicting vehicle height adjustment requests are required for the front side and the rear side at the same time. In this case, in the vehicle height adjustment control device 10,
For example, as described above (Case I), when the front side is under air supply control, when the supply and exhaust control means receives the rear side pressure discharge signal from the vehicle height determination means, the rear exhaust request flag Ro is Based on the set of the exhaust valve operation flag Rv and the exhaust valve operation flag 0, the air supply control for the front air suspension tank IF is completed, that is, the front supply and exhaust valve operation flag Fv and the compressor operation flag ■
Waiting for this to clear, the exhaust valve 4 for the rear air suspension IR will begin to open.

According to this embodiment, as shown in FIG.
It is divided into a pressure adjustment process for the front air suspension vent IF indicated by F34 and a pressure H adjustment process for the rear air suspension IR indicated by 5R10 to 5R34, which further includes step 5FI1.12, step 5F21. 22, Step 5F32, Step 5
RII.

12, steps 5R21, 22, and step 5R32 are provided. Therefore, the pressure regulation request, ie, the pressure supply signal or the pressure discharge signal, is received individually and control of the pressure supply and discharge device is started for whichever one is received first. When other adjustment requests are received during this control, if they are the same, the 1M control received later is started without waiting for the completion of the control started earlier, and if they conflict with each other, the 1M control received later is started. Since the subsequent control is started after waiting for the completion of the control started earlier, it is possible to minimize the number of operations of the pressure supply/discharge device 5 and to shorten the control time. I can do it.

Further, according to this embodiment, as shown in FIG. 4, step 5IFII, step 5IF21, step 5IRII
, step 5TR21 are provided. Therefore, according to the above process, when the pressure adjustment process is performed for one vehicle height adjustment section, the vehicle height detection signal output from the vehicle height detection means provided in one vehicle height adjustment section is If the output of the vehicle height detection signal that requires a pressure adjustment process that is contrary to the pressure adjustment process that is currently being executed changes soon, the output of the vehicle height detection signal that is contradictory to the pressure adjustment process that is currently being executed changes immediately, until the pressure adjustment request is determined based on the changed vehicle height detection signal. It is possible to prevent the pressure adjustment process from being over-executed.

For example, when air is being supplied to the rear air suspension vent IR, if the air supply is stopped by unloading luggage from the rear trunk, the vehicle will soon pass the standard vehicle height (about 2 seconds) and the rear vehicle height will be lower than the vehicle's height. When the vehicle height changes from a high vehicle height to a high vehicle height, the vehicle height adjustment system of the present embodiment responds to the rear air supply request based on the above processing so that the output of the rear vehicle height detection means 2R changes from a low vehicle height to a high vehicle height. Since the air supply request is cleared immediately, the air supply request is not executed unnecessarily until the exhaust request is determined based on the high vehicle height (S I R1 → 5IR2 → 5IR3 → 5TRI
O→5IR20→5IR21).

"Effects of the Invention" The present invention provides two or more vehicle height adjustment parts, a single pressure supply/discharge device that supplies and discharges pressure to each of the vehicle height adjustment parts,
vehicle height detection means for detecting the vehicle height in each of the vehicle height adjustment sections; and the pressure supply/discharge device for adjusting each of the vehicle height adjustment sections to a reference vehicle height in response to a signal from each of the vehicle height detection means. In the vehicle height adjustment system in front of the vehicle, the vehicle height adjustment control device receives signals from each of the vehicle height detection means, and detects when the vehicle height is low. is the pressure supply signal, and in the case of high vehicle height, the pressure discharge signal,
A vehicle height determining means generated for each of the vehicle height adjusting sections, and receiving each of the signals from the vehicle height determining means individually, and controlling the pressure supply/discharge to one vehicle height adjusting section based on reception of one signal. If control of the device is started, and during the control, another signal identical to the first signal is received, control of the pressure supply/discharge device for the other vehicle height adjustment parts is started, and the first signal is supply/discharge control means for starting control of the pressure supply/discharge device for another vehicle height adjustment section after the control for the one vehicle height adjustment section is completed when another signal contradicting the signal is received; The supply/discharge means individually receives each signal from the vehicle height determination means, and controls the pressure supply/discharge device for one vehicle height adjustment section based on the one signal. When another signal is received during this control, if it is the same as the one signal, the pressure supply/discharge to the other vehicle height adjustment section is started without waiting for the completion of the control for the one vehicle height adjustment section. When control of the device is started, and if this signal conflicts with the first signal, wait until the control for the first vehicle height adjustment section is completed and then start controlling the pressure supply/discharge device for the other vehicle height adjustment section.
By starting i-control, it is possible to minimize the number of times the pressure supply/discharge device operates and shorten the control time.

[Brief explanation of the drawing]

Fig. 1 is an overall layout diagram showing an embodiment of a vehicle height adjustment system, Fig. 2 is a system configuration block diagram of an embodiment of the present invention, and Fig. 3 is a diagram of the supply/discharge control means of an embodiment of the present invention. FIG. 4 is a flowchart showing the control structure of the vehicle height determination means according to an embodiment of the present invention, and FIGS. FIG. 4 is a time chart diagram showing the actions of the control means and the vehicle height determination means. 1...Air suspension vent tongue (vehicle height adjustment part), 2...
Vehicle height detection means, 3... Compressor, 4... Exhaust valve, 5...
Supply/exhaust valve, 10...Vehicle height adjustment control device.

Claims (1)

[Claims] Two or more vehicle height adjustment sections, a single pressure supply/discharge device that supplies and discharges pressure to each of the vehicle height adjustment sections, and vehicle height detection means that detects the vehicle height in each of the vehicle height adjustment sections. and a vehicle height adjustment control device that receives signals from each of the vehicle height detection means and controls the pressure supply/discharge device in order to set each of the vehicle height adjustment units to the reference vehicle height. In the adjustment system, the vehicle height adjustment control device receives the signals from each of the vehicle height detection means, and outputs a pressure supply signal when the vehicle height is low and a pressure discharge signal when the vehicle height is high. A vehicle height determining means generated for each vehicle height adjusting section; and the pressure supply/discharge device for individually receiving each of the signals from the vehicle height determining means, and based on reception of one signal, the pressure supply/discharge device to one vehicle height adjusting section. start controlling the
During the control, if another signal identical to the one signal is received, control of the pressure supply/discharge device for the other vehicle height adjustment parts is started, and another signal contradicting the one signal is received. and a supply/discharge control means for starting control of the pressure supply/discharge device for the other vehicle height adjustment sections after the control for the one vehicle height adjustment section is completed when the pressure supply/discharge device is received. Vehicle height adjustment system.