JPS6338085Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vehicle height sensor structure in an automobile vehicle height adjustment device.

An air suspension is used as a wheel suspension system for an automobile, and the vehicle height is raised by supplying air from the outside to the air-sealed portion of the air suspension, and the vehicle height is lowered by discharging the enclosed air to the outside. In an automobile vehicle height adjustment device that allows for vehicle height adjustment, the vehicle height sensor installed in the air suspension is divided into a low vehicle height sensor that controls vehicle height in a low standard vehicle height range and a vehicle height sensor that controls vehicle height in a high standard vehicle height range. It is configured by a combination of two sets of vehicle height sensors for high vehicle height that perform vehicle height control, and is also provided with a changeover switch that switches between the vehicle height sensors for low vehicle height and high vehicle height. The vehicle height sensor for low vehicle height automatically controls the vehicle height at a low standard vehicle height to improve driving stability, and when driving on rough roads, the vehicle height sensor for high vehicle height is switched to the high standard vehicle height. The applicant has developed a vehicle that automatically controls the height of the vehicle to improve its ability to travel on rough roads.
A patent application is currently pending as Patent Application No. 43410.

In the above-mentioned vehicle height adjustment device, the switch 1 constituting the vehicle height sensor is set to 2 for low vehicle height using two switches SW1 and SW2, and 3 for high vehicle height is used as shown in FIG. as SW3, SW
In the case of a configuration using two switches (4), conventionally a 5-core harness with a common grounding lead e for each switch was used, so two switches were used: one for low vehicle height and one for high vehicle height. As shown in Figure 5, the changeover switch S (usually using a relay) that switches between 3 and 3 is the switch SW1 on the lower side of 2 for low vehicle height and 3 for high vehicle height.
It must have a structure with a contact point for switching the lower switch SW3 of the lower vehicle height, and a contact point for switching the upper switch SW2 of the low vehicle height 2 and the upper switch SW4 of the high vehicle height 3. The disadvantage is that S is large and expensive. In Figures 4 and 5, a, b, c, and d are each switch SW1 to SW4.
4 indicates a control box that outputs a vehicle height up signal or down signal based on the signal from the vehicle height sensor to control the intake and withdrawal of air from the air sealing part of the air suspension. It shows.

As described above, the present invention uses a total of four switches as a vehicle height sensor, two for low vehicle heights and two for high vehicle heights, and by improving the connection configuration of each switch, four harnesses can be used. The number of contacts of the changeover switch is reduced by half compared to the conventional one, in order to simplify the sensor structure, reduce the size, and reduce the cost. An example will be explained.

Fig. 1 shows an example of an air suspension to which the present invention is applied, in which 11 is a cylindrical body 11a whose lower end is attached to the wheel support member side, and a cylindrical body 11a which is slidably fitted into the cylindrical body 11a and whose upper end is attached to the vehicle body. It is a telescopic member consisting of a rod 11b attached to the side, and on the outer periphery of the telescopic member 11 are a lower tank 14 provided on the cylindrical body 11a, an upper tank 15 attached to the rod 11b, and the lower tank 14 and the upper tank 15.
An air-tight air sealing section 12 is formed by a diaphragm 16 and the like that air-tightly connect the two. Then, by supplying air from the supply/exhaust valve 13 into the air sealing part 12, the telescopic member 11 expands to raise the vehicle height, and by discharging air from the supply/exhaust plug 13, the telescopic member 11 contracts. It is now possible to lower the vehicle height.

A vehicle height sensor consisting of a drive magnet 17 fixed to the cylindrical member 11a and a switch assembly 1 attached to the rod 11b is provided in the air enclosure 12, and a signal from the vehicle height sensor is used to control the air enclosure. Air is automatically taken in and out of the section 12 to adjust the vehicle height.

Switch assembly 1 that constitutes the above vehicle height sensor
As shown in Figure 2, there are four magnetically sensitive switches each having bias magnets MG1 to MG4.
It is composed of a combination of SW1 to SW4, and among the four switches SW1 to SW4, SW1 and SW2 are for low vehicle height.
The fact that SW3 and SW4 are 3 for high vehicle height is the same as in the conventional one shown in Fig. 4, but in the present invention, the grounding lead wire is changed to the grounding lead wire e1 of 2 for low vehicle height. Grounding lead wire e2 for high vehicle height 3
The + side lead wires of each switch SW1 to SW4 are made to be common to the lower switch SW1 of 2 for low vehicle height and the lower switch SW3 of 3 for high vehicle height,
Switch SW2 on the upper side of 2 for low vehicle height and 3 for high vehicle height
The upper switch SW4 has a common b, and the harness pulled out from the switch sheath 1 has four cores, a, b, e1, and e2, and is connected from the switch sheath 1 to the control box 4 as shown in FIG. The circuit of the two earthing lead wires e1 and e2 is switched by a changeover switch S provided between the grounding leads e1 and e2.

In the present invention configured as described above, when the changeover switch S is turned on on the earthing lead wire e1 side of the low vehicle height 2 as shown by the dotted line in FIG.
The vehicle height is controlled by SW2 in the low standard vehicle height range, and when the grounding lead wire e2 side of high vehicle height 3 is turned on as shown by the solid line in Figure 3, SW3
and SW4, the vehicle height is controlled within the high standard vehicle height range.

That is, when the changeover switch S is turned on to the low vehicle height 2 side shown by the dotted line, the drive magnet 17 is turned on.
When the vehicle is located below SW1, SW1 is turned on and the fact that the vehicle height is lower than the set value is input to the control box 4, and the control box 4 outputs an output to raise the vehicle height and also drives the vehicle. When magnet 17 is located above SW2, SW2 is turned on, and in response to that signal, control box 4 issues an output to lower the vehicle height, and drive magnet 17 is located between both switches SW1 and SW2. Both switches
Adjust and maintain the vehicle height at the low vehicle height setting with both SW1 and SW2 turned off.

When the changeover switch S is turned on to the high vehicle height 3 side shown by the solid line, the drive magnet 17 is set to SW3.
When the vehicle is located at a lower position, SW3 is turned on, and in response to that signal, control box 4 generates an output to raise the vehicle height, and drive magnet 17
is located above SW4, SW4 turns on, control box 4 outputs an output to lower the vehicle height, and drive magnet 17 switches to SW4.
Both switches SW3, located between SW3 and SW4,
Adjust and maintain the vehicle height at the high vehicle height setting with both SW4 turned off.

In Fig. 2, bias magnets MG1~
4 gives each of the magnetically sensitive switches SW1 to SW4 a magnetic field strength intermediate between the impression value (the strength of the magnetic field that should cause ON operation) and the open value (the strength of the magnetic field that should cause OFF operation). It functions to keep the switch in the on or off state even after the influence of the magnetic force of the drive magnet has diminished.

As described above, according to the present invention, two switches for low vehicle height,
In the combination of a total of 4 switches, 2 for high vehicle height, and a changeover switch for switching between low vehicle height and high vehicle height, the lead wire can be a 4-core harness, which is different from the conventional one. Compared to a 5-core harness,
In addition to simplifying harness routing,
The number of contact points of the changeover switch can be halved compared to the conventional one, and the vehicle height sensor structure itself can be simplified, downsized, and significantly reduced in cost, which can bring great practical effects. be.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the main parts of an air suspension to which the present invention is applied, Figure 2 is a front explanatory view of the switch in Figure 1 and shows an embodiment of the present invention. FIG. 2 is a circuit diagram showing a switching mode using a changeover switch, FIG. 4 is an explanatory front view of a conventional switch, and FIG. 5 is a circuit diagram showing a switching mode using a conventional switch. 1...Switch switch, 2...Switch for low vehicle height, 3...Switch for high vehicle height, 4...Control box, 17...Drive magnet, S...
Changeover switch.

Claims (1)

[Scope of utility model registration request] Using a switch consisting of two low vehicle height switches that control vehicle height in a low standard vehicle height range and two vehicle height switches that perform vehicle height control in a high standard vehicle height range, and In a vehicle height sensor equipped with a switch for switching between a low vehicle height switch and a high vehicle height switch, the grounding lead wire of the two switches for low vehicle height and the grounding lead wire of the two switches for high vehicle height are connected. The grounding lead wire is made independent, and the grounding lead wire on the low vehicle height side and the grounding lead wire on the high vehicle height side are configured to be switched by a switch, and the grounding lead wire on the lower side for low vehicle height The switch and the lower switch for high vehicle height use the same + side lead wire, and the upper switch for low vehicle height and the upper switch for high vehicle height use the same + side lead wire. Vehicle height sensor structure for automotive vehicle height adjustment device.