JPS63240416A - Height control device - Google Patents

Abstract

PURPOSE:To carry out quick height control in response to a height change when a passenger gets on and off a vehicle, for example, before and after starting of the vehicle, by setting a delay time of height control by a height control device to be short just after selecting an ignition key from off to on position. CONSTITUTION:An energizing control device 220 constituting a part of a height control device 200 receives detection signals from photo sensors 101 and 102 as height detecting means and energizes according to the detection signals a relief valve 300, motor 401, compressor 402, relay 403 and a suspension device 500 as height control means after a predetermined delay time. The height control device 200 further includes a clock pulse generating device 210 as delay time control means, which operates to control the delay time for the energizing control device 220 to be short just after selecting an ignition key of a vehicle from off to on position.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to height control of a vehicle body, and in particular, detects the height of the vehicle body with a vehicle height detector and measures the height of the vehicle body in response to the detected vehicle height. The present invention relates to adjusting the height of a vehicle by controlling a vehicle height adjusting means to maintain the vehicle height within a predetermined range.

(Prior art) In this type of vehicle height adjustment, for example, U.S. Pat.
No. 105,216.

The vehicle height detector detects the vehicle height range, and the signal processing circuit processes the detection signal to obtain a signal that energizes the vehicle height adjustment drive system.
This is given to the vehicle height control circuit, and the vehicle height is adjusted in the drive system.
When it is "high," it reduces the fluid pressure in the suspension system, and when it is "low," it increases the fluid pressure.

Therefore, in order to prevent repeated fluid pressure lowering operations when the detected vehicle height vibrates near the boundary between "medium" and "high", and when the detected vehicle height vibrates near the boundary between "medium" and "low", In order to prevent pressure-up operation, the vehicle height control circuit generally includes one set of rise delay circuits for the vehicle height "high" signal processing system and the vehicle height "low" signal processing system, respectively. The delay time is, for example, about IO seconds.

(Problem to be solved by the invention) If this delay time is short, the number of repetitions of vehicle height adjustment in response to bumps in the road or climbs increases, resulting in poor vehicle height stability and frequent operation of the drive system. If it is long, the duration of the vehicle height deviation will be long, making it difficult to adjust the vehicle height. On the other hand, if a driver gets on the car while parked or stopped and starts driving,
When the driver gets on board and there are passengers, the vehicle height changes depending on the driver and the passenger getting on the vehicle.Furthermore, the change in vehicle height is even greater when loading and unloading luggage before starting the vehicle. It is preferable that high adjustment works.

SUMMARY OF THE INVENTION An object of the present invention is to quickly adjust the vehicle height in response to changes in vehicle height caused by people getting on and off the vehicle or loading and unloading luggage before and after the vehicle starts.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an adjusting means for adjusting the height of the vehicle body with respect to the vehicle;
A vehicle height detection means that generates a signal; and a vehicle height detection means that, in accordance with the signal generated by the vehicle height detection means, adjusts the height of the vehicle body relative to the vehicle to the target range after a delay time from when a change that requires vehicle height adjustment appears in this signal. Said to adjust! ! In a vehicle height adjustment device comprising: a vehicle height biasing control means for energizing a vehicle height biasing means; A delay time adjustment means for determining a short time is provided.

(Function) That is, when the driver gets in the vehicle and turns on the ignition key switch, the vehicle height adjustment delay time is set to be short immediately after that. As a result, if a passenger gets on or off the vehicle or cargo is loaded or unloaded before or after the ignition key switch is turned from off to on, the vehicle height is quickly adjusted to the appropriate range. Even if there are no passengers getting on or off or loading or unloading luggage, the vehicle is normally stopped when the ignition key switch is turned on, so the vehicle height adjustment delay time is set to be short immediately after that, as mentioned above. However, the stability of the vehicle height is not affected.

Therefore, when the ignition key switch is turned on, changes in vehicle height caused by people getting on and off or loading and unloading luggage are quickly responded to and the vehicle height is adjusted to the appropriate range, and the vehicle height is adjusted to the appropriate range immediately after the ignition key switch is turned on. After that, while the vehicle is running, highly stable vehicle height adjustment is performed.

Other objects and features of the invention will become apparent from the following description of an embodiment with reference to one drawing.

(Example) Fig. 1 shows a vehicle height detector 10 used in an example of the present invention.
The installation on the vehicle of 0 shows the mode. ly, high detector 100
is fixed to the vehicle body frame IO, one end of a link 20 is connected to its rotating shaft, and the other end of this link 20 is connected to the outer case of the differential gear 30. 40 is an axle.

A cross-sectional view of the vehicle height detector 100 is shown in FIG. 2a. In the vehicle height detector 100, a light shielding plate 105 having an arcuate fold 104 is fixed to the tip of a rotating shaft 103, and a link 20 is fixed to the other end. A printed circuit board 107 is fixed to the base 106, and photosensors 101 and 102 are fixed to this printed circuit board 107.

A cross section taken along the line ■--■ in FIG. 2a is shown in FIGS. 2b to 2d. Note that FIG. 2b shows a state in which the vehicle height is "r high," FIG. 2c shows a state in which the vehicle height is "medium," and FIG. 2d shows a state in which the vehicle height is "low."

The photosensors 101 and 102 are composed of a light emitting diode and a phototransistor as shown in FIG.
is blocked. Photo sensor 101.102 according to vehicle height
The outputs A and B (Figure 3a) are shown in Table 1 below.

FIG. 3a shows an embodiment of the present invention using the vehicle height detector described above. In this embodiment, the vehicle height adjustment control device is
Clock pulse generator 210 and energization control device 22
Consists of 0.

The clock pulse generator 210 includes a delay circuit (resistor Rd and capacitor Cd) for detecting power-on (+Vt) and an inverter IN1. Mono multivibrator MM1 for door closing detection. Pulse oscillator 2111 frequency division counter C011 time limit counter CO2 and gate element O
It is composed of RI, NAI to NA3, etc. In this clock pulse generator 210, when +v1 is applied to the resistor Rd by turning off the ignition key switch, +
Inverter INI makes 1 pulse (plus) when applying v1
will occur. The door switch 50 is opened when the door is closed and closed when the door is opened.If at least one of them is closed (door open), the warning lamp 60 lights up.The mono multivibrator MHI must be input. earth) to H
(positive constant level), that is, the state change from open to closed, generates one pulse (positive), so when one door changes from open to closed, the monomultiple Vibrator MMI outputs one pulse.

The input/output timing of the clock pulse generating bag rri210 is shown in FIG. 3b. Clock pulse generation bag with reference to Figure 3b! ! To explain the operation of 210, when the power supply +Vl is turned on, a voltage is simultaneously applied to each of the circuit elements, and the oscillator 211 operates to generate a pulse f.

This pulse f is applied to the counter Cot, and the counter C
01 applies a pulse with a period twice that of pulse f to the Qo end, a pulse of 8 times the period to the Q2 end, and 16 times the period to the Q3 end.
It generates pulses with twice the period, and continuously outputs these pulses while the power is on, that is, while the ignition key switch is closed. The counter CO2 counts the output pulses of the counter COI Q2, but stops counting up when the Q end reaches a high level H after counting 8 pulses. Then, when the clear input terminal CLR becomes H, the clear state is entered. Therefore, counter C
For O2, after the power is turned on (pulse b) or the vehicle door changes from open to closed, the Q3 terminal is set to L until the COI Q2 terminal output pulse is counted 8 times, and the count of 8 pulses is kept. When finished, the Q3 end becomes H. The output of the Q3 end of the counter CQ2 is a significant signal, and while the output of the Qa end is L, the Nant gate NA2 outputs the inverted pulse h of the pulse of the Qo end of C01, and when the output of the Q3 end becomes H. The Nant gate NAI outputs an inverted pulse g of the pulse at the Q3 end of C01. As a result, as shown in FIG. 3b, the output i of the Nantes gate NA3, that is, the device 21
The output clock pulse of 0 is from power-on and door closing to To (when the Q3 terminal output of counter CO2 is a significant signal (L
) becomes the Qo@ output pulse of the counter COI, and thereafter becomes the output pulse of the Q3 end of the counter COI (with a cycle eight times the output pulse of the Qo end). This output pulse i of the Nant gate NA3 is applied to the energization control device 22
Applied to 0.

The energizing control device 220 includes a Noah gate NR1, a counter C
O3, AND gate Al, A2 and inverter IN2
The vehicle height detection signals A and B of the vehicle height detector 100 are applied to the NOR gate NRI, and the signals A and B are applied to the AND gates A1 and A2, respectively.

These signals change depending on the vehicle height as shown in Table 1. Counter CO3 is clear while its clear input is at H. Since the NOR gate NRI outputs the inversion of the logical sum of A and B (inversion of A+B), Table 1 is also referred to.

Counter CO3 is cleared when the vehicle height is "medium".

When the vehicle height becomes r high J (A=H) or "low J (B=H)", the clock pulse i starts counting, and is cleared when the vehicle height returns to "medium". When the counter CO3 counts eight clock pulses i, the Q3 terminal changes from L to H, the output of the inverter IN2 changes from H to L, and the count is stopped. AND gate Al has signal A and Q3 terminal output,
Since the signal B and the Q3 terminal output are applied to the AND gate A2, when the vehicle height changes from "r medium" to "r high" and remains at "r high", the clock pulse i is changed from "r high" to 8.
At the time when the count is counted, the output of the AND gate A1 changes from L to the vehicle height lowering instruction level H, which opens the relief valve 300, lowers the air pressure in the air chamber of the suspension system 500, and lowers the vehicle height. When the signal A changes from H (r high') to L (r low'), the counter CO3 is cleared, so both of the AND gates A1 become L, and the relief valve 300 is closed.

When the vehicle height changes from "Medium" to "Low J (B=H)" and remains at "Low", Tarotku Pulse i changes from "Low".
When eight counts have been made, the output of AND gate A2 changes from L to vehicle height raising instruction level H, which closes the motor support relay 1103 and rotates the motor 401.
The air compressor 402 is driven, and the suspension system 500
The air pressure in the air chamber increases and the vehicle height increases. Signal B is ■
” to L (vehicle height “low”), the counter CO3 is cleared, so both 5-AND gates A2 become L, relay 7I03 opens and compressor 402 stops.

As described above, the clock pulse generator 21O provides the energizing control device 220 with short-period pulses during To from power-on or door closing, and thereafter, long-period pulses with eight times the period as clock pulses i. .

When the vehicle height changes from "medium" to "r high" or "r low", the energization control device 220 applies a clock pulse i as long as the vehicle height continues to be "r high" or "r low".
Since the vehicle height lowering instruction signal or vehicle height increasing instruction signal is output after the delay time Td of 8 counts, the delay time Tds after turning on the power or between door closing and connection To and the delay time Tdr after To elapses. teeth.

Tds/Tdr: 1/8, and if the delay time Tdr during driving is, for example, 8 seconds, immediately after the power is turned on or the door is closed, when the vehicle height becomes "high" or "low", Tds = 1 second later. Control to set the vehicle height to ``R Medium'' is started, and the vehicle height is automatically adjusted to the appropriate value range ``R Medium'' much faster than before.

FIG. 4 shows a vehicle height adjustment control device 200 according to another embodiment of the present invention.
In the embodiment shown in FIG. In the timer 250, the counter CO2 starts counting pulses f in response to turning on the power or closing the door, and when it counts 64 pulses, the output at the terminal Q6 becomes . One pulse is generated at the Q2 terminal of the counter COI every 8 cycles of f, and when the counter CO2 counts 8 Q2 output pulses, the output at the Q3 terminal becomes H, so even in the embodiment shown in FIG. , the Q6 terminal of counter CO2 becomes a significant signal (L) during To (Fig. 3h) after the power is turned on or the door is closed.In the 6-energization control device 220, counter CO3 counts pulses f, and during To The output of the Q4 end of the counter CO3 is applied to the output of the Q7 end after To, and the output of the Q7 end is applied to the AND gate Al, A2, and inverter IN2. During To, the delay time Tds is the count time of 16 pulses f. Next door.

After To has elapsed, the delay time Tdr becomes the count time of 128 pulses f. In the embodiment shown in FIG. 3a, within 10 hours, the Qo end output pulse of the counter Cot (2 pulses f)
The counter CO3 counts the period (double period) and applies the output from the Q3 terminal to the AND gate Al, A2 and the inverter IN2, so the delay time Tds is 2x8 of the pulse f = 16
count time.

Therefore, the predetermined time T in the embodiment shown in FIG. and the delay times Tds, Tdr will be equal to those of the embodiment shown in FIG. 3a if the pulses f have the same period.

Another embodiment of the invention is shown in FIG. 5a.

In this embodiment, the vehicle height adjustment control device 200 is implemented using a one-chip microcomputer (hereinafter referred to as microcomputer) MP.
It is composed of U.

The ROM of the microcomputer U monitors the state of the vehicle height detector 100 and the door switch starting from the moment the power is turned on, and shortens the delay time for a predetermined time after the power is turned on or the door is closed. program data is stored that controls the vehicle height by setting a longer delay time and otherwise setting a longer delay time. The control operation of the microcomputer MPU based on the program data is shown in FIG. 5b. Note that in FIG. 5b, a register refers to one memory area of the RAM of the MPU, and a timer refers to execution of a program timer that counts a set number of clock pulses (or timing pulses). MP with reference to FIG. 5a and FIG. 5b below.
The control operation of U will be explained.

First, the registers and memory contents shown in FIG. 5b are shown in Table 2 below.

When the MPU is powered on, it clears the registers and input/output ports (611=L, 612=L), then reads the input ports 01, 602 and 605, and stores their input states in the input registers. Then, referring to the memory contents of the delay register, the contents of the delay timer register for counting the elapsed time after the power is turned on or when the door is closed are set to 1.
Update memory of the sum added to the delay timer register, compare the contents of the delay timer register with the set value n, and if it is greater than n, store 2 in the delay register and write To=n
Clear the timer register to indicate the progress of tg,
If it is smaller than n, this process is skipped and the vehicle height signal is read from the input register.

If A=H (vehicle height "high"), clear the low register just in case and reset the memory duration time of vehicle height "low"),
Clear output port 12 just in case and compressor 4
02 Set L to stop, update the high register with the sum of the contents of the high register and add 1 to the memory, and then refer to the contents of the delay register and set it to 0 (after the power is turned on or for a predetermined time of door closing To = nt .

), the reference value is set to nds (nds t O=
Tds), and when it is other than 0 (To has elapsed), set the reference value to ndr (ndrt O=Tdr), compare the contents of the high register with the reference value, and determine if the value is greater than the reference value (vehicle height r continues to be greater than Td). did: Td=Tds or Tdr
), set I] in the output port 11, open the relief valve 300, and lower the reference value (vehicle height r height).
(continues below Td), this step is skipped and the timer (to) is turned on.

If B = H (vehicle height "low"), clear the high register just in case and reset the memory duration of "vehicle height r high")
, Clear the output port 11 just in case and set it to L to close the relief valve 300, update the memory by adding 1 to the contents of the low register in the 10 register, and then refer to the contents of the low register and read its contents. When is 0, the reference value is set to nds, and when it is other than 0, the reference value is set to ndr, and the contents of the 1oν register are compared with the reference value and determined to be greater than the reference value (vehicle height "low" continued for Td or more; Td= Tds
or Tdr), the output port 12 is set to H and the compressor 402 is driven, and the vehicle height is smaller than the reference value (vehicle height "
If "low" is less than Td, this step is skipped and the timer (to) is turned on.

If A=L, B=L (vehicle height "medium J"), hjgh.

Clear both 1oν registers and output portro 11.61
Both clear (relief valve closed, compressor stopped)
and turn on the timer (to).

When the to time limit of the timer (to) is completed (time-over), the process returns to reading the input ports 01, 602, and 605, and repeats the above operation. Therefore, reading of the input port is performed at a period of approximately tQ (sampling period). If the door is opened during this repetition, 1 is stored in the delay register, and if the door is closed when the memory of the delay register is 1 (door is considered open), the delay is stored. Clear the register and set its contents to O. While the content of the delay register is 0, the content of the delay timer register counts up (the content is 1) as described above.
(updated memory of the sum of 0), this period is the same as the sampling period, and is rewritten to a value 2 other than 0 after To=:nt6. therefore.

The contents of the delay register are after the power is turned on or when the door is closed.
)=nt, and is O only during O, when the elapsed time (delay time) reference value becomes a small value nds.

When it is not 0, it is set to a large value ndr, and therefore, after lt power is turned on (within 1:=nto or door closed connection T
Continuously n ds t □ = T within o=ntO
If the vehicle height is equal to or higher than ds, lowering or raising the vehicle height is started after Tds has elapsed. After To has elapsed, the vehicle height will not be lowered or raised unless the vehicle height continues to be "high" or "low" at or above ndrt O=Tdr4.
[Effects of the Invention] As described above, in the present invention, the adjustment means (300, 401 to 403, 500) for adjusting the height of the vehicle body with respect to the vehicle;
Vehicle height detection means (IO) generates a signal according to the height of the vehicle body.
o); In response to the signal generated by the vehicle height detection means (100), the height of the +li body relative to the vehicle is adjusted to the target range after a delay time after a change indicating the need for vehicle height adjustment appears in this signal. The adjustment means (300°401-403)
, 500)
); In response to switching of the vehicle ignition key from OFF to ON, immediately after that, a delay is set to shorten the delay time of the vehicle height energizing control means (220, Ml)U); Time adjustment means (210, 250
, MPU); so that a person (driver.

When boarding/unloading passengers (passengers) or loading/unloading luggage,
The vehicle height is quickly adjusted to the appropriate range. Even if no one is getting in or out, when the ignition key switch is turned on,
Since the vehicle is normally stopped or running at low speed, even if the vehicle height adjustment delay time is set short immediately after that, as described above, the stability of the vehicle height will not be impaired.

Therefore, when the vehicle height changes due to people getting on and off or loading and unloading luggage, the vehicle height is quickly adjusted to the appropriate range immediately after the ignition key switch is turned on, and the vehicle is highly stable while driving. Vehicle height adjustment is performed with a relatively long delay time.

[Brief explanation of the drawing]

FIG. 1 is a side view showing how the vehicle height detector 100 is mounted in an embodiment of the present invention, and FIG. 2a is a sectional view of the vehicle height detector 100. Figures 2b, 2c and 2d show the second
FIG. 3 is a cross-sectional view taken along the line II-n of FIG. a, showing different operating states. FIG. 3a is a block diagram showing an embodiment of the present invention; FIG. 3b is a block diagram showing an embodiment of the present invention;
The figure is a time chart showing the timing of signals of each part. FIG. 4 is a block diagram showing another embodiment of the present invention. FIG. 5a is a block diagram showing still another embodiment of the present invention, and FIG. 5b is a block diagram showing a microcomputer MP shown therein.
3 is a flowchart showing the control operation of U. 10: Body frame 20: Link 30: Differential gear 40: Axle 50: Door switch

Claims (1)

[Claims] Adjustment means for adjusting the height of the vehicle body with respect to the vehicle; vehicle height detection means for generating a signal according to the height of the vehicle body; A vehicle height adjustment device comprising: vehicle height bias control means for biasing the adjustment means so as to adjust the height of the vehicle body relative to the vehicle to a target range after a delay time after a change requiring vehicle height adjustment appears. A vehicle height adjustment device comprising: delay time adjustment means that responds to switching of a vehicle ignition key from off to on and immediately sets the delay time of the vehicle height energization control means to be short.