JPS58161609A - Car height adjusting device of car air suspension - Google Patents

Abstract

PURPOSE:To maintain the car height properly on a smooth road and a rough road by constituting a car height sensor provided in an air seal section in an air suspension with a car height sensor for the smooth road and a car height sensor for the rough road so as to switch them for use. CONSTITUTION:A car height sensor 9 consisting of a magnet 8 fitted to the upper end of the cylinder 11 of an expansion member 1 and three magnetic sensitive switches 91-93 is provided in the air seal section of an air suspension. Said switches 91-93 are arranged at a predetermined distance in the expansion direction of the expansion member 1, and a low standard car height range (a) is set between switches 91, 92 and a high standard car height range (b) is set between switches 92, 93. On/off signals of individual switches 91-93 are fed to a car height control circuit through a transfer switch 10, and the intake valve and discharge valve of the intake/discharge system of the air seal section 2 are opened or closed based on these signals so as to adjust the car height automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle height adjustment device for an air suspension for an automobile.

In the case of an air suspension that utilizes the volumetric elasticity of the air sealed inside as a single-wheel suspension system for a car, the vehicle height is raised by supplying air from the outside to the air sealed part of the air suspension. Vehicle height can be lowered by discharging the enclosed air to the outside.

Therefore, a vehicle height sensor consisting of a combination of a bar magnet and a plurality of magnetic sensors that operate in response to the magnetism of the bar magnet is installed inside the air enclosure of the air suspension. It detects whether the relative height position is within the standard vehicle height range, and automatically adjusts the vehicle height by supplying or discharging air into the air-filled part of the air suspension based on the signal from the vehicle height sensor. Devices for adjusting vehicle height within the standard vehicle height range have already been developed (for example, Japanese Patent Laid-Open No. 54-120129, Japanese Patent Laid-Open No. 54-120).
No. 150 (2%) (Kokai No. 54-120151).

On the other hand, the vehicle height of a car is:
It is desirable to make it as low as possible, but if the vehicle height is low, vibrations above and below the vehicle body when driving on rough roads may cause #I to be installed on the vehicle body or under the floor. There is a risk that the equipment WA may be grounded and damaged.

In order to deal with the above problems, in cars using air suspension, when driving on good roads, the vehicle height is lowered to improve driving stability, and when driving on bad roads, the vehicle height is raised to keep the vehicle body, etc. on the ground. When trying to control the vehicle height to prevent this, the vehicle height sensor disclosed in the above-mentioned prior art cannot handle the situation.

The present invention uses a vehicle height sensor manufactured by 411, which is a combination of a vehicle height sensor that uses a low vehicle height as a reference vehicle height and a vehicle height sensor that uses a high vehicle height as a reference vehicle height. On good roads, the low vehicle height sensor automatically controls the vehicle height at a low reference vehicle height, and on rough roads, the sensor switches to the high vehicle height sensor to lower the vehicle height to the standard vehicle height. It is designed to be controlled at ^.

The present invention will be explained below with reference to heavy-duty examples.

In FIG. 1, 1 consists of a cylindrical body 11 that is attached to the wheel support member side of a suspension vehicle, for example, and a rod 12 that is slidably fitted into the cylindrical body 11 and whose upper end is attached to the vehicle body. The telescopic member 1 has a lower tank 4 provided on the cylindrical body 11 on its outer periphery. rod 12
Upper tank attached to 5. An air-tight air sealing section 2 is formed by a diaphragm 6 made of a flexible member that air-tightly connects the lower tank 4 and the upper tank 5. Reference numeral 3 indicates the supply and exhaust of the air sealing section in orange, and 7 indicates a bump stopper.

Inside the air enclosure 2 of the air suspension configured as described above, there is a vehicle height suspension 9 consisting of a magnet 8 and a magnetically sensitive member such as a reed switch that operates in response to the magnetism of the magnet 8. are attached to the relatively movable two-member cylindrical body 11gm and the rod 12 side of the extension member 1 so as to be close to and opposite to each other.

For example, as shown in FIG. 2, the vehicle height sensor 9 has a structure in which magnetically sensitive switches 59A, S1, 92, and fig are arranged at a predetermined distance in the direction of expansion and contraction of the expansion and contraction member 1, and the above-mentioned switch 91 and The lower reference vehicle height range 6 is between the middle switch s2 and the lower reference vehicle height range 6, and the lower reference vehicle height range is between the middle switch 92 and the lower switch 93.

The on/off signals of the switches 91, 92, and 93 are input to a vehicle height control device (not shown), respectively.
Based on the signal, the vehicle height control circuit supplies air to the air filling section 2.
#It is set to automatically adjust the vehicle height by controlling the opening and closing of the air supply valve and exhaust valve of the air system, but each switch 91
, 92 and 93 are provided with a changeover switch 10 as shown in FIG.
It is possible to switch between a state in which only the signals 92 and 93 are input, and a state in which only the signals 92 and 93 are input.

With the above configuration, by keeping the changeover switch 10 in the 11-line state when driving on a good road, only the magnetically sensitive switch 91 and the S20 line are input to the vehicle height control device (not shown), and the switches 81 and 92 are Vehicle height control is performed in the low reference vehicle height range α by the vehicle height sensor A for low vehicle height, and driving stability can be improved.

When driving on a rough road, the change-over switch 10 is switched as shown by the broken line either manually by the driver or by a rough road signal from the emergency decision device.

Then, only the signals from the magnetically sensitive switches 92 and 93 are input to the vehicle height control device, and the vehicle height is controlled in the high reference vehicle height range by the high commercial vehicle height sensor B, which is made up of the switches 92 and s3. This prevents grounding accidents such as floor parts and under-floor parts.

FIG. 4 shows another embodiment of the present invention, in which magnetically sensitive switches are arranged at predetermined intervals in the direction of expansion and contraction of the 4gA expansion and contraction member 1, and the upper 2f(2) 91 and 92 are The vehicle height sensor A is for low vehicle heights, and the lower 2@93 and 94 are vehicle height sensors B for high vehicle heights. Switching between low vehicle height and high vehicle height B is shown in Figure 5. Such a changeover switch 10
It was designed to be carried out at

In the examples shown in FIGS. 4 and 5, when driving on a good road, the selector switch 10 is set so that switches 91 and 92 are turned on as shown by the solid line, and the vehicle height signal for low vehicle height and the vehicle height signal for sensor A are set. is input to a vehicle height control device (not shown), and based on the signal, the vehicle height is controlled within the low reference vehicle height range a to improve driving stability. Switches 93 and 94 are automatically turned on and switches 91 and 92 are turned on as shown by the broken lines when the changeover switch 10 is turned on.
is switched off, and only the vehicle height signal from high vehicle height sensor B is input to the vehicle height control device, which controls the vehicle height within the standard vehicle height range and prevents the vehicle body or underfloor parts from coming into contact with the ground. This is to prevent accidents.

In each of the above-mentioned embodiments, when the changeover switch 10 is automatically controlled to change over, the sudden conclusion determination device may determine that the road is rough when the vertical acceleration of the vehicle body exceeds a predetermined value, and switch the changeover switch 10. Using a vertical acceleration sensor that issues a switching signal for the switch 10, or a vertical acceleration sensor and a gear position sensor that detects the gear position of the transmission, the problem occurs when the vertical acceleration exceeds a predetermined value and the gear position is at a low gear other than the highest gear. A device that detects a road and issues a switching signal, or a combination of an acceleration sensor, a gear position sensor, and a vehicle speed sensor to detect a rough road when the vertical acceleration is above a predetermined value, the gear position is low, and the vehicle speed is below a predetermined value. Alternatively, in the embodiment shown in FIG. 2, a medium magnetically sensitive switch 820 can detect the frequency of on and off operations within a predetermined period of time and keep the frequency constant. If the on/off frequency is less than a predetermined value, it is determined that the road is bad and a switching signal is issued for the changeover switch 10, and if the on/off frequency is less than a predetermined value, it is determined that the road is good and the changeover switch is returned to its original position. good.

Similarly to the above, in the embodiment shown in Fig. wJ4, when the vehicle height sensor A for low vehicle height is used, the magnetically sensitive switches 9f, 9
When the frequency of on/off operation of either switch 2 is higher than a predetermined value, it is determined that the road is rough and changeover switch 1 (l) switches from the east line state to the broken line state in Figure 5, increasing the vehicle height. When vehicle height sensor B is used, when the frequency of on/off operation of either switch 93 or 94 is below a predetermined value, it is determined that the road is in good condition and the selector switch 10 is moved from the state shown by the broken line in Figure 5 to the east. K may also be used to switch to the line state.

In this way, if the changeover switch 10 is automatically switched by determining whether the road is good or bad based on the on/off frequency of the magnetically sensitive switch that constitutes the desk sensor, the above-mentioned vertical acceleration sensor, etc. There is no need for any sensors such as gear position sensors and vehicle speed sensors for determining rough roads, which is extremely advantageous in that the structure can be significantly simplified and costs can be significantly reduced.

As described above, according to the original @AK, it is possible to automatically control the vehicle at a low standard vehicle height when driving on a good road, significantly improving driving stability, and at the same time to maintain a high standard vehicle height when driving on a rough road. It is possible to reduce the vehicle height to prevent grounding accidents of the vehicle body or under-floor parts, and it can bring about a great practical effect.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional explanatory view of the main parts of an air suspension showing one embodiment of the present invention, Fig. 2 is a front view of the vehicle height sensor section of Fig. 1, and Fig. 3 is! Figure @2 is an explanatory diagram of the changeover switch section of the vehicle height sensor, Figure @4 is a front view showing another example of the vehicle height sensor section,
FIG. 5 is an explanatory diagram of a changeover switch section of the vehicle height sensor shown in FIG. 4. DESCRIPTION OF SYMBOLS 1... Expandable member, 2... Air enclosure part, 8... Magnet, 9... Vehicle height sensor, 91, 92, s3
, 514... Magnetic sensitive switch, 10... Changeover switch, A... Umbrella back sensor for low vehicle height, B... Close sensor for bulky vehicle height. Above Arm 1 Tuan 3 Figure 52- Beak 4 Kuni 5 l

Claims (2)

[Claims] (1) Equipped with a 5K air suspension that has an air-filled part that seals air inside, and automatically adjusts the vehicle height by controlling the air supply and exhaust of the air-filled part based on the signal from the vehicle height sensor. In automobiles, the above-mentioned vehicle height sensor is divided into two sets: a vehicle height sensor for low vehicle height that controls vehicle height in a low standard vehicle height range, and a vehicle height sensor for high vehicle height that controls vehicle height in a high standard vehicle height range. A vehicle height wj4 adjustment device for an air suspension system for an automobile, characterized in that it is constructed by a combination of the following, and is provided with a changeover switch for switching between the two vehicle height sensors, one for low vehicle height and one for low vehicle height. (2) Equipped with a 5K air suspension that has an air sealed part with air inserted inside it, and automatically adjusts the vehicle height by controlling the air supply and exhaust of the air sealed part based on the signal from the vehicle height sensor. In automobiles, there are two types of vehicle height sensors: a vehicle height sensor for low vehicle height that controls vehicle height in a low standard vehicle height range, and a vehicle height sensor for high vehicle height that controls vehicle height in a high standard vehicle height range. It is constructed by a combination of sets, and is provided with a changeover switch for switching between the two vehicle height sensors for low weight and high vehicle height.
When the on/off frequency of the magnetically sensitive switch, which is a component of the vehicle height sensor, is less than a predetermined value, the selector switch is switched to turn on the vehicle height sensor for low vehicle height, and the magnetically sensitive switch is turned on. , T! that the changeover switch is changed to turn on the vehicle height sensor l1il for high ground height when the off-action release is above a predetermined value. Vehicle height adjustment device for air suspension for automobiles.