JPS60206710A - Car height regulating device - Google Patents

Abstract

PURPOSE:To prevent frequent adjustment of the height of a car, by a method wherein, in a car height regulating device for a car, the device is constituted such that the upper and the lower limit of a desired car height are varied by means of an opening and a closing signal from the openable body of a car. CONSTITUTION:When a car is caused to run in a condition in which a trunk is opened, a detecting signal 1 is outputted from a trunk opening detecting means 7a, and the signal 1 is also outputted from an OR circuit 8a. In this case, a signal from a car speed detecting means 15 is 0, and thereby a changeover switch 6f is kept in a primary state. However, when a car is brought to a stop, an output 15 is brought into 1, an AND circuit 8b outputs the signal 1 to changeover the changeover switch 6f as shown by a broken line. This causes connection of a wide lower limit value output means 6c and a wide upper limit value output means 6e with increasing side and decreasing side amplifiers 6h and 6i, resulting in widening of upper and lower limit values. This constitution permits a decrease in frequency of regulation of the height of a car.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is used in the technical field of vehicle height adjustment devices for automobiles, etc., and in particular, adjusts the vehicle height by adjusting the opening/closing state of an opening/closing body provided on a vehicle body. This relates to vehicle height adjustment devices that have been banned.

(Prior Art) Several vehicle height adjustment devices have been known for vehicles such as automobiles. For example, if the height of the vehicle can be adjusted according to the load, load fluctuations will occur due to passengers getting on and off, loading and unloading luggage, refueling, etc. when doors and other openings are open.
There is a problem in that vehicle height adjustment is frequently performed, and the resulting noise causes discomfort.

Incidentally, a vehicle height adjustment device for maintaining a constant vehicle height without depending on the load or the like in a vehicle such as an automobile is well known, for example, from Japanese Patent Publication No. 7891/1983.

(Object of the Invention) In the present invention, in a vehicle height adjustment device for an automobile, etc., the upper and lower limits of the target vehicle height value when adjusting the vehicle height can be varied depending on the opening/closing state of an opening/closing member such as a door provided on the vehicle body. The purpose of the present invention is to provide a vehicle height adjustment device that eliminates frequent vehicle height adjustments.

(Structure of the Invention) This invention provides a vehicle height adjustment device that provides a fluid chamber whose volume can be changed between a vehicle body and an axle, and adjusts the fluid in the fluid chamber to change the volume of the fluid chamber to adjust the vehicle height. In,
An opening/closing body opening/closing detection means for detecting the opening/closing of an opening/closing body provided in the vehicle body so as to be openable and closable, and control capable of manually changing the upper and lower limits of a target vehicle height value by manually inputting an output signal from the opening/closing body opening/closing detection means. 1. A vehicle height adjustment device comprising: a vehicle height adjustment device, wherein the vehicle height is adjusted by the control device.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 3.

In the overall view of FIG. 1, a vehicle body 1 such as an automobile, an axle 2 supported by the vehicle body 1, a fluid chamber 3 whose volume can be changed provided between the vehicle body 1 and the axle 2, and a fluid chamber 3 provided in the fluid chamber 3. A hydraulic pump 4 and an electromagnetic switching valve 5 for supplying hydraulic pressure for mowing,
a control device 6 that controls switching of the electromagnetic switching valve 5 and can change the lower and lower limits of the target vehicle height value during vehicle height adjustment;
Opening/closing body opening/closing detection means 7 for detecting opening/closing of the opening/closing body provided in the vehicle body 1 and inputting the output to the control device 6
A vehicle speed detecting means 15 outputs a high level signal when the vehicle speed is zero, and output signals from the vehicle speed detecting means 15 and from the opening/closing body opening/closing detecting means 7 are input, and the control device 6 detects the target vehicle. A logic circuit 8 is shown which outputs a signal instructing a change in the "1" lower limit of the high value.

In FIG. 2 and FIG. 3, the vehicle 11i1112, the axle 2a which is offset by -1, and the fluid chamber 3 are shown only for one of the four wheels.
A screw (hen 3b) is loosely fitted into the cylinder 3a, and a piston rod 3c with a considerably large diameter is fixed to the piston 3b, passing through one end of the cylinder 3a. 3d'/J<. Also, a stopper 3e is fixedly provided in the middle of the piston rod 3C to be used when the fluid chamber 3 expands.

The piston 3b is provided with a one-sided valve 3f that allows flow toward the piston rod 3C side and a one-sided valve 3g that allows flow toward the side opposite to the piston rod. These one-way valves 3f and 3g are connected to the piston 3b
Although the tongue piece 31 is provided to open and close the oil passage 3k+ passed through the valve, a one-sided valve having another known configuration may be used. The end 3j of the cylinder 3a on the opposite rod side is attached to the bearing casing 2b of the axle 2, and the tip 3h of the piston rod 3C is attached to the bracket 1a provided integrally with the vehicle body 1. The bracket 1a has a mount 1 to a rubber 1b interposed between the vehicle body 1 side and the receiving portion of the piston rod tip 3h. Furthermore, a stopper 3e is provided on the fluid chamber 3 side of the bracket 1a to stop the cylinder 3a when the fluid chamber 3 is reduced.

The piston rod 3C has an oil passage of 3 m passing through it in its axial direction.
is formed, and a gas spring 9 is connected to this 3m oil path.
is provided. The gas spring 9 has an upper hemispherical shell 9a and a lower hemispherical shell 9b that are airtightly integrated via an O-ring 9C, and an elastic wall 9e is provided on the lower hemispherical shell 9b with a stopper 9d so that the inside of the gas spring 9 can be moved up and down. It is divided airtightly.

A cap 9f for preventing close contact is provided at the lower center of the wall 9c.Thus, the area above the elastic wall 9e in the gas spring 9 is filled with gas, and below the elastic wall 9e, the inside of the lower hemispherical shell 9b becomes the fluid chamber 3. It is filled with hydraulic oil by communicating with the 3m oil passage, and functions as an accumulator.

The hydraulic pump 4 is driven by a motor 4a and pumps hydraulic oil in an oil tank 4b.

As shown in the figure, the electromagnetic switching valve 5 is configured with 3 positions and 4 ports, and the discharge side pipe 10 of the hydraulic pump 4 and the return pipe 11 to the oil tank 4b are connected to the two on the hydraulic source side of the electromagnetic switching valve 5.
The other two ports 1- are connected to oil passages 3 of separate fluid chambers 3 (for example, on the left and right sides of the vehicle body 1).
m and gas spring 9 by a conduit 12.

The opening/closing body opening/closing detection means 7 includes a trunk opening detection means 7a for detecting opening/closing of a trunk (not shown) provided in the vehicle body 1, and a fuel tank inlet (not shown) provided in the vehicle body 1.
Fuel open detection means 7b for detecting opening/closing of (not shown)
and a door open detection means 7c for detecting opening/closing of a door (not shown) provided on the vehicle body 1. Both are configured so that a high level signal outputting a ``1'' in the ``open'' state is output, and a low level signal outputting a ``0'' in the ``closed'' state is output.

The vehicle speed detection means 15 detects the speed v=0 of the vehicle body 1 and
1”, when ■≠0, r
They are each configured to output a low level signal that generates OJ.

Logic circuit 8 includes an OR circuit 8a and an AND circuit 8b. The OR circuit 8a is connected to input the output signals of the trunk open detection means 7a, the fuel open detection means 7b, and the door open detection means 7c, and furthermore, the output signal of the OR circuit 8a is connected to the circuit A1. It is connected as one input of 8b.

The output signal of the vehicle speed detection means 15 is connected as the other input of the circuits 1 to 8b.

Control device? A vehicle height sensor 13 for detecting the vehicle height X and a target vehicle height level output means 14 for outputting a signal indicating the target vehicle height level Xo are provided in association with each other. The control device 6 receives the signal X outputted from the target vehicle height level output means 14. Target level width setting means 6a is provided which can change the upper limit value and lower limit value for. Furthermore, the target level width setting means 6a is provided with a narrow lower limit value output means 6b, a Pope limit value output"-1 stage 6c, a narrow upper limit value output means 6d, and a floor upper limit value output means 6e, all of which are set at the target vehicle height level. It is connected to input the output signal from the output means 14. Then, when the upper and lower limit widths are narrow, the value of half of the width is αl, and when the upper and lower limit widths are wide, the value of half of the width is α2
Then, the output signal of the narrow lower limit value output means 6d is "Xo-
α2'', the output signal of the narrow upper limit value output means 6d is r
+α1", and the output signal of the Pope limit value output means 6c is "Xo-
The output signal of α2j and the floor upper limit value output means 6e is “Xo
10α2” are respectively configured to be hail values. Of course, αl is set to a value smaller than α2, and the value of 2αl (that is, the value of the narrow vehicle height level width) is the value of the appropriate dead zone when automatically controlling the vehicle height during normal running of the vehicle body 1. Set as width. Also 2α2
The value of this invention is that of frequent coilovers! When it is desired to eliminate the load, the width of the dead zone is set to such an extent that the vehicle height adjustment is not performed. Target level width setting means 6
A is further provided with a changeover switch 6f. As shown, the changeover switch 6f has a two-pole, double-throw configuration, and is configured to be switched from the initial state shown in the drawing by inputting a high level signal from the AND circuit 8b to the solenoid 6g. Further, as shown in the figure, the changeover switch 6f is connected to switch between the upper limit value and the lower limit value of each of the output signals 6b to 6e of the upper and lower limit value output means.

The control device 6 includes a vehicle height sensor 13 and a changeover switch 6.
An up-side differential amplifier 6h and a down-side differential amplifier 61 are provided, which input the signal switched by f. The output signal from the selector switch 6f is supplied to the positive input terminal of the upper differential amplifier 6h and the negative input terminal of the lower differential amplifier 61, and the negative input terminal of the lower differential amplifier 6h and The output signals of the vehicle height sensor 13 are connected to the positive input terminals of the lower differential amplifier 61, respectively. Furthermore, the upper side power amplifier 6j "connected to input the output signal of the lower side differential amplifier 6h" and the lower side power amplifier 6h connected to input the output signal of the lower side differential amplifier 61 are connected to input the output signal of the lower side differential amplifier 61. provided. The output of the up-side power amplifier 6j is connected to operate the solenoid 5a of the electromagnetic switching valve 5, and the output of the down-side power amplifier 6h is connected to the down-side solenoid 5b.

Next, the operation of the above embodiment will be described.

When the trunk, fuel, and door of the vehicle body 1 are each closed, the outputs of each of the rank open detection means 7a, the fuel open detection means 7b, and the door open detection means 7c are all "0" as a hail signal. Therefore, due to the well-known action of the OR circuit 8a which inputs these outputs, its output signal becomes a signal representing "1".

On the other hand, when the vehicle body 1 is running, the output signal from the vehicle speed detection means 15 is a signal indicating "0", and therefore the output signal from the AND circuit 8b in this case is a signal indicating "0". Therefore, the changeover switch 6f remains in the initial state shown in the figure, and a signal indicating "r A hail signal is input to rXJ.

As a result, the output signal of the rising side differential amplifier 6h is “Xo−
α1-X" becomes a hail signal. Also, one positive input terminal of the lower differential amplifier 61 receives a signal that injects rXJ, and the other negative input terminal receives "Xo+α
1” is input as a hail signal. As a result, the output signal of the lower differential amplifier 61 becomes r)((xo+α+)J.If X<Xo−α1, then
A high-level signal is output from the up-side differential amplifier 6h, and since X < Xo+α1, of course, a high-level signal is not output from the down-side differential amplifier 61. This high level output signal from the raising side differential amplifier 6h becomes a raising command signal, which is input to the raising side power amplifier 6j, and its output drives the raising side solenoid 5a, and the electromagnetic switching valve 5 is set to the lower side. (In Figure 1, the upper
(left side in the figure). Accordingly, the hydraulic oil discharged from the hydraulic pump 4 is pumped through the discharge side pipe 10 - the electromagnetic switching valve 5 - the pipe 12 - the oil pipe 3m - the inside of the cylinder 3a on the anti-Japanese Rad side - the one-way valve 3f. Ru.

At this time, the same hydraulic pressure acts on the rod side and the anti-rod side of the piston 3b, but since the area on the anti-rod side is larger, an upward force acts on the boston 3b in the figure, and the fluid Chamber 3 expands and hydraulic fluid flows into its increasing internal volume.

In this way, the vehicle body 1 is lifted and the vehicle height X becomes large.

Then, if X o + a 1>X>X o −α1, then the lower side differential amplifier 6
1 does not output a high level signal, therefore, the upper solenoid 5a and the lower solenoid 5b do not operate together, the solenoid switching valve 5 is at the neutral position shown in the figure, and the inflow and outflow of hydraulic oil in the fluid chamber 3 is also prevented. Therefore, the value of vehicle height X remains constant.

Contrary to the above explanation, when X > X o + αJ, as is clear from the explanation of the operation described above, a high level lowering command signal is output from the lowering side differential amplifier 61, and the lowering side solenoid 5b is activated, the electromagnetic switching valve 5 is switched to the lower side (lower side in FIG. 1, right side in FIG. 2), and the pressure oil in the fluid chamber 3 is communicated with the atmosphere through the return pipe 11.

Therefore, the fluid chamber 3 is reduced in size due to the weight of the vehicle body 1, and as the volume inside the fluid chamber 3 is reduced, the hydraulic oil is returned to the oil tank 4b.

Then, as described above, Xo+α1>X>XO−α1
When tb is reached, vehicle height control is stopped.

Next, considering the case where the vehicle body 1 is run with ranks 1 to 1 open, in this case, from the 1 to rank open detection means 7a to r
A hail signal is output from lj, and "1" is also output from the OR circuit 8a.
” is output, but since the output from the vehicle speed detection means 15 is a signal that detects rOJ, the output signal of the AND circuit 8b remains as a signal that indicates “0”, and the pope outputs the previous signal. The effect is similar to the explanation.

However, when the vehicle body 1 is stopped and any one of the opening/closing bodies is open and a signal indicating "1" is output from one of the opening/closing body opening/closing detection means 7, either the OR circuit 8a or the vehicle speed detection means 15 The output also becomes a signal that sends rIJ. Therefore, the output signal of the AND circuit 8b becomes a high level indicating "1", the solenoid 6g is activated, and the changeover switch 6f is switched as shown by the broken line in the figure. In this case, the positive input terminal of the up-side differential amplifier 611 and the negative-side input terminal of the down-side differential amplifier 61 are connected to Xo−
A signal α2 or Xo+α2 is input.

As mentioned above, since α2>αl, X, o+α2
> X > X o -a 2 The range of X is X2
+α1>X>X It is a dog than the range of X of o−α1. As understood from this, the changeover switch 6
The width of the dead zone for vehicle height control by the control device 6 when the vehicle is being switched is considerably large, and vehicle height control is almost always not performed.

The embodiments of the present invention are not limited to the forward bending range; for example, the output signals of the opening/closing body opening/closing detection means and the vehicle speed detection means may be reversed from those of the above-mentioned embodiments, and the logic circuits may also have the same effect. Various modifications are possible, including other configurations.

(Effects of the Invention) The present invention provides a vehicle height adjustment device for an automobile, etc., which includes an opening/closing body opening/closing detection means for detecting opening/closing of an opening/closing body of a vehicle body, and further inputs a force signal of the opening/closing body opening/closing detection means. Since the vehicle is equipped with a control device that can change the upper and lower limits of the target vehicle height, it is necessary to open the opening/closing body of the vehicle to unload cargo, refuel, or get on and off the vehicle. The control device that controls the vehicle height can be deactivated for most of the time when the height changes, and there is no vertical movement of the vehicle body due to frequent activation of the control device, and there is no discomfort due to noise or other noise caused by this. be.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the invention, FIG. 1 is an overall view including a partial longitudinal sectional view, a hydraulic piping diagram, and a block diagram, and FIG. 2 is a main part including a hydraulic piping diagram. The longitudinal sectional view and FIG. 3 are block diagrams.

Claims (1)

[Claims] (1) In a vehicle height adjustment device that includes a fluid chamber whose volume can be changed between the vehicle body and the axle, and adjusts the vehicle height by adjusting the fluid in the fluid chamber and changing the volume of the fluid chamber, the vehicle height adjustment device is configured to open and close the vehicle body. an opening/closing body opening/closing detection means for detecting opening/closing of an opening/closing body provided so as to be open/closed, and a control device capable of changing the upper and lower limits of a target vehicle height value by inputting an output signal from the opening/closing body opening/closing detection means, A vehicle height adjustment device configured to adjust the vehicle height using this control device.