JPS6088617A - Car height adjustment device - Google Patents

Abstract

PURPOSE:To eliminate the need for unrequired car height adjustment and improve fuel consumption and comfortability to drive by determining whether a car has stopped now or not and updating the car height immediately after the car stops as the reference car height when the car has stopped now. CONSTITUTION:Detection signals are input to a microcomputer 1 respectively from car height sensors 2 and 3 and a car speed sensor 4. In addition, the microcomputer 1 periodically makes a process of interruption for the sake of halt time reference car height setting processing by using the input signal of the car speed sensor 4. In other words, either running or halting is determined by a determining means just after stopping. When it is determined to be just after stopping, the car height immediately after the car stop is set to the reference car height through a halt time reference car height setting means. As a result, unrequired car height adjustment such as unrequired car height adjustment operation when the car stops a sloping road can be eliminated and fuel consumption and comfortability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicle height adjustment device that detects the vehicle height of a vehicle and controls the vehicle height so that the vehicle height becomes an appropriate vehicle height.

(Background of the Invention) As a conventional vehicle height adjustment device, for example, Japanese Patent Laid-Open No. 57-14
As disclosed in Japanese Patent No. 4113, there is a device that sequentially detects the vehicle height using a predetermined vehicle height detector and adjusts the vehicle height so that the detected vehicle height approximates a predetermined reference vehicle height.

However, in the above-mentioned conventional vehicle height adjustment device, since the above-mentioned reference vehicle height is fixed, the following disadvantages occur. For example, if the vehicle stops on a slope, the front or rear of the vehicle will be raised due to the vehicle's weight, etc., and the vehicle height will deviate from the standard vehicle height above, making it impossible to adjust the vehicle height. It is done.

However, the vehicle height fluctuation at this time is due to the vehicle stopping on a slope, and this would not have occurred if the vehicle had stopped on a flat road.

Therefore, as described above, if unnecessary vehicle height adjustment is performed when the vehicle is stopped on a slope, fuel consumption increases due to driving the vehicle height adjustment device, so it is necessary to avoid unnecessary vehicle height adjustment operations.

(Objective of the Invention) The present invention has been made in consideration of the above-mentioned circumstances, and its purpose is to eliminate unnecessary vehicle height adjustment operations and improve fuel efficiency and ride comfort. The purpose is to provide a vehicle height adjustment device.

(Summary of the Invention) Hereinafter, the 4f6 configuration of the present invention will be briefly explained using the block diagram shown in FIG.

The vehicle height detection means 100 sequentially detects the vehicle height from the road surface to a predetermined part of the vehicle, and the vehicle height PiI!J adjustment mechanism control means 101 adjusts the detected vehicle height to a predetermined height. Drive control of di high sub-adjustment 111Jf4'IO,2.

On the other hand, if the vehicle has just stopped, or if the immediately after stopping determination means 103 makes a J:C determination, and it is determined that the vehicle has just stopped, stop If,'1 阜tll; iJJ
The height setting means 104 updates and sets the vehicle height J3 immediately after the vehicle stops as the reference vehicle height.

(Description of Embodiments) Hereinafter, embodiments of the vehicle height adjusting device according to the present invention will be described in detail with reference to FIG. 2 and subsequent drawings.

FIG. 2 is a block diagram showing the electrical configuration of an embodiment according to the present invention.

As shown in the figure, this vehicle height adjustment device is constructed using a so-called microcombicoater 1. The vehicle height adjustment control according to the present invention is executed according to the system program.

The input port of the microcomputer 1 receives vehicle height data L+ from two vehicle height detectors 2 and 3.

L2 is input.

The vehicle height detector 2.3 can be configured, for example, by an ultrasonic distance measuring device equipped with an ultrasonic transmitter/receiver. In addition, there are devices configured to detect changes in vehicle height based on the output of a potentiometer installed in the suspension of the vehicle. And the vehicle height detector 2
, 3 are attached to and attached to the front lower surface-side edge portion and the rear lower surface-side edge portion of the vehicle body 6, as shown in FIG.

In the microcomputer 1, 1-recorded vehicle height data Ll,
Based on the power of 12 people, the front car +! 1+J! + (height from the road surface to the front lower surface of the vehicle body 6) JjJ, and rear vehicle height Z (height from the road surface to the rear lower surface of the vehicle body 6) are calculated.

Similarly, the human-powered boat of Micro Combi Coater'l has
When the output of the vehicle speed sensor 4 is inputted, the microcomputer 1 determines whether the vehicle is running or stopped.

On the other hand, a valve opening/closing signal is output from the output boat of the micro combi coater 1, and the driving circuit 5 is driven based on this valve opening/closing signal to control the front and rear valves 9,
10 to adjust the air pressure in the front vehicle height adjustment section 7 and the rear vehicle height adjustment section 8.

FIG. 4 shows the stop I+, +JJJ ill according to the present invention;
It is a flow rF-t- without showing the details of the vehicle height setting process,
This process is periodically interrupted and executed by a timer interrupt.

When the process shown in the figure is started, first, in step (1), it is determined whether the vehicle is traveling or not. This is a process of reading the output data of the vehicle speed sensor 4 and making a determination based on the read data. If the determination result of step (1) is that the vehicle is running, the process proceeds to step (4), and the pre-stored reference vehicle height for running is set to the reference vehicle height (base semi-front vehicle height H+ + base 11 (rear vehicle height)). Takato 12)
The settings are stored together.

On the other hand, if it is determined in step (1) that the vehicle is stopped, the process proceeds to step (2), where it is determined whether or not the vehicle has just stopped.

The determination as to whether the vehicle has just stopped is determined based on the determination result of step (1) above, and that the vehicle has transitioned from a running state to a stopped state (this is performed using a flag, etc.) Then, a predetermined timer is started from the time when the state of "1 run → stop" is detected (1 - stop), and when the timer time has elapsed, a groove or It becomes.

The above timer time is set to, for example, 2 to 3 seconds,
This is because pitching of the vehicle body generally occurs immediately after the vehicle stops running fj, so it is appropriate to define "immediately after stopping" with a gap between the ribs until this pitching phenomenon disappears.

If it is determined that the vehicle has just stopped, then the process of step (3) is executed, and the vehicle height data L'l, 12 is read from the width detector 2.3 of C1, and the current vehicle height is read. (Front vehicle height fV, + +2 to rear vehicle height) above reference vehicle height (1
11, 1-12> and the settings storage process is executed.

On the other hand, if it is determined that the vehicle has not just stopped, the vehicle height update process is not performed since the vehicle height immediately after the stop has already been set and stored as a reference vehicle height in a previous process.

In this way, in the device of this embodiment, when the vehicle is running, the QjH vehicle height is set and stored as the J1 single vehicle height while the vehicle is running, and when the vehicle is stopped, the vehicle height is set and stored as the J1 vehicle height. A process is performed in which the vehicle height after I is set and stored as the reference vehicle height.

Next, based on the reference vehicle height set as described above, a fifth vehicle height adjustment process is performed to adjust the vehicle height so that the vehicle height detected by the vehicle height detector becomes the reference vehicle height. This will be explained using the flowchart shown in the figure.

When the process shown in the figure is started, it is determined in step (5) whether the front vehicle height control flag F1 is set to "1". ) to (14) are performed, and if NO, determine whether the front vehicle height changes in steps (6) to (9) are correct.
The processing that follows is executed.

In step (6), the vehicle height data L+ detected by the vehicle height detector 2 is read, and 1 is calculated as the front vehicle height;
After storing the calculation result in a predetermined front vehicle height register FR, the front vehicle height value R+ and the standard vehicle height I-1+, which is preset and stored in the process shown in FIG. Calculate the absolute value of the difference (,11+-1-1+ + >,
A process of determining whether or not it is less than a predetermined permissible variation range Δl+1, and determining that front vehicle height adjustment is necessary when the front vehicle height E1 deviates from the above-mentioned permissible range Δ111 and remains in the 1c state for a certain period of time. can't do it.

The above fluctuation tolerance range Δh1 is above I'iL! base) ((vehicle height)
-11 Vehicle height change IJJ f
This is to set the fr capacity range, and this n′I″f5
Even if the vehicle height changes within the range, the vehicle height cannot be adjusted.
By processing it as i, we aim to improve the stability of the vehicle adjustment fee till operation.

Next, if the result of step (6) is YES, it means that the vehicle height change is within the above-mentioned 5'[container box υ1j, so the front vehicle^ adjustment fee 911 is not performed.

On the other hand, if the execution result is NO, step a3 indicates that the vehicle height change exceeds the allowable width Δ111, and the process proceeds to step (8).

In step (8), the clock time of the predetermined timer T1 is set and stored in advance. % is exceeded.

The above reference time is based on the fact that the vehicle height changes instantaneously or temporarily due to unevenness of the road surface, braking, or acceleration of the vehicle, and each time the vehicle height changes, the vehicle height becomes unnecessary. Prevent J adjustment from happening C1,1: J
- It is set for the purpose of

Further, the timer T1 performs a timing operation according to the output of a clock generator within the microcomputer 1,
Each time the execution result of step (6) becomes YES, the time measurement contents are cleared in step <7).

Therefore, when the displacement of the front vehicle height 1 relative to the standard vehicle height 1-11 exceeds the variation r1 range Δl+ + for a period of 11 or more consecutive times, the execution result of step (8) is ,
If YES, that is, it is determined that there is a change in vehicle height, the process proceeds to step (9) and sets "1" to the nfJ vehicle height control flag F1.

In this way, when it is determined in step (8) that there is a change in vehicle height and the front vehicle height flag F1 is set to 1'', in the subsequent processing, the execution result of step (5) is Y.
The process becomes ES and proceeds to step (10), where front vehicle height adjustment control is performed.

In step (10), the vehicle height data L+ from the vehicle height detector 2 is read, nη vehicle height A1 is calculated, and the front vehicle height E1 and +WiKaku1. A size comparison is made with llp vehicle height 1-11.

If the front vehicle height II + h < reference vehicle ^H + J, and the height is also small, the process proceeds to step (11), where the front valve drive signal is output, the front valve 9 is heard, and the front vehicle height adjustment section 7 is 1. The front vehicle height increases due to the inflow of compressed air. E is attacked.

Also, if the front vehicle height 1 is larger than the standard front middle height 1-1 + J:, the step advances to step (1/l), a front valve opening instruction signal is output, the front valve 9 is opened, and the front side The compressed air in the vehicle height adjustment section 7 is discharged into the vehicle, thereby controlling the front vehicle height to be lowered.

In this way, when the front vehicle height raising 511 or lowering control is executed and the front vehicle height equals 1 to the reference front vehicle height H1, the process proceeds from step (10) to step (12) and the valve is opened. A closing signal is output, the front valve 9 is closed, and the middle/height adjustment control operation is stopped, and step <13
), the front vehicle height control flag F1 is reset to 1 to store the completion of the front vehicle height adjustment control. With this, in the subsequent processing, step (5) to step (
The process proceeds to step 6) to perform a process of determining whether or not there is a change in the front vehicle height.

Then, steps (15) to (24) are executed in parallel with the front vehicle height change determination and adjustment control process as described above.
) The rear vehicle height change determination and adjustment control processing are executed in the same manner.

In FIG. 5, flag F2 is a rear vehicle height control flag, and has the same function as the front vehicle height control flag F1. Further, G12 is a reference rear vehicle height, which corresponds to the reference front vehicle height H1.

Timer T2 corresponds to the timer T1.

In this way, in the device of this embodiment, by referring to the reference vehicle height immediately after the vehicle stops as the reference vehicle height, for example, when the vehicle is stopped on a slope and the vehicle body is tilted forward or backward, (vehicle height) Adjustment control is performed to eliminate inconveniences such as damage to the lower surface of the vehicle body due to vehicle height fluctuations when the vehicle shifts from this state to flat driving.

In addition, even if the vehicle height slightly exceeds the permissible fluctuation range Δ1)1, if this condition continues to 1 beyond the timer time of ``timer 1'' +, -r2, the vehicle height will be adjusted. However, when the vehicle is running, vibrations during running may cause the OFt timer to become blind.

During the timer time of 1-2, the vehicle height is allowed to fluctuate by Δh.
1, the vehicle height is not adjusted frequently. In addition, when the vehicle comes to a stop, the reference vehicle height is set to the vehicle height immediately after the vehicle stops, so the above fluctuation L'
] Capacity width Δ1) 1 is set centering on the vehicle height after stopping ll', 1 C1 Like the conventional device, stopping
There is no longer a possibility that the vehicle height will greatly deviate from the permissible variation range due to an increase or decrease in the entrance or other items.

On the other hand, the vehicle height adjuster (14) generally has friction, and when adjusting the vehicle height, the effect of the friction is greater when the vehicle is stopped than when the vehicle is running. ]N, there was an inconvenience that when the vehicle height adjustment was performed, the vehicle height adjustment was performed every time the vehicle stopped in order to adjust the deviation due to the friction, but in the device of this embodiment, this problem is solved. The quality of vehicle height adjustment can be improved.

(Effects of the Invention) As explained above in detail, the vehicle height adjustment device of the present invention is configured such that the standard vehicle height is set to the vehicle height immediately after the vehicle is stopped while the vehicle is stopped. By doing this, it is possible to prevent an unnecessary vehicle height adjustment operation from being performed in J5 when the vehicle is stopped on a slope, for example. As a result, fuel consumption is not wasted, and riding comfort can be improved.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a block diagram of the present invention, and FIG. 2 is a block diagram showing the electrical configuration of an embodiment of the vehicle height adjustment device according to the present invention.
Fig. 3 is a plan view showing the arrangement of the vehicle height detector and the vehicle height adjustment mechanism in the vehicle body in the same embodiment device, and Fig. 4 is the stop reference vehicle height setting process actually carried out in the same embodiment device. FIG. 5 is a flowchart showing the details of the vehicle height adjustment process in the device of the embodiment. 100...Vehicle height detection means 101...Vehicle height adjustment mechanism control means 102...
...Vehicle height adjustment! a structure 103...immediately after stop determination means 104...stop opening '11 (mid-height setting means 1,
・・・・・・・・・・・・Microcomputer 2.3・
・・・・・・Vehicle height detector 4・・・・・・・・・Vehicle speed sensor 5・・・・・・
...... Drive circuit 7.8 ... Vehicle height adjustment section 9.10 ... Valve 11 ... Air tank patent applicant Nissan Jidochu Co., Ltd.

Claims (1)

[Scope of Claims] (1) Vehicle height detection means for sequentially detecting the vehicle height at a predetermined portion of the vehicle from the road surface; A vehicle height adjuster 1 that drives and controls a predetermined vehicle height adjustment 111.
7! Immediately after stopping determining means for determining whether or not the vehicle has just stopped; When it is determined that the vehicle has just stopped, the vehicle height value J3 immediately after the vehicle has stopped is determined by the above 1411; ! ;Vehicle height 1 characterized by having a set stage when stopped that is updated as the vehicle height! J adjustment device.