CN105644294B - The control method of the air suspension apparatus of automobile and the air suspension apparatus of automobile - Google Patents

Abstract

The invention discloses an automobile air suspension device and a control method of the automobile air suspension device, which can prevent a compressor used in the air suspension from being damaged due to overheating. Therefore, according to the air suspension device for automobiles and the control method for air suspension devices for automobiles according to the embodiments of the present invention, whether the compressor is overheated or not is judged by the amount of compressed air discharged from the compressor.

Description

Air suspension device of automobile and control method of air suspension device of automobile

technical field

The present invention relates to an automobile air suspension device and a control method for the automobile air suspension device, and more specifically, relates to an automobile air suspension device equipped with an air suspension and a control method for the automobile air suspension device.

Background technique

Generally speaking, suspensions have limitations in satisfying ride comfort and handling stability at the same time. If the ride quality becomes better, the steering stability will decrease, and if the steering stability becomes better, the ride quality will decrease. The reason for this is as follows. If the spring of the suspension is made soft, it is easy to absorb the impact caused by the irregular road surface and has a good ride feeling. However, the vehicle body becomes unstable to reduce handling stability. On the contrary, if the spring is stiffer, the steering stability will be improved, but the impact transmitted by the road surface cannot be fully absorbed and the ride quality will be reduced. However, conventional coil springs made of steel cannot change the hardness arbitrarily. Therefore, an air spring using air is manufactured. Air springs are easy to control air pressure and can be stiffened or softened as desired. The suspension using this kind of air spring is the air suspension.

The air suspension is composed of the air spring, a compressor for compressing air, and an air tank for storing the air compressed by the compressor and supplying it to the air spring. - electronic control unit) etc. to control the supply and discharge of compressed air, so that the air spring adjusts the height of the vehicle body.

However, if the compressor is driven for a long time, the compressor will be damaged internally due to overheating. In order to prevent this phenomenon, a temperature sensor is installed on the compressor and when the temperature of the compressor exceeds a preset temperature, the drive of the compressor is temporarily stopped.

However, since there is no method of measuring the temperature of the compressor when the temperature sensor fails, a method of minimizing the driving time of the compressor is used in order to prevent damage to the compressor. As mentioned above, if the driving time of the compressor is restricted, the pressure in the air tank will be insufficient, which will lead to the problem that the air spring cannot adjust the height of the vehicle body.

Contents of the invention

(technical problem to be solved)

The technical problem to be solved by the present invention is to provide an automobile air suspension device and a control method of the automobile air suspension device, which can prevent the compressor used in the air suspension from being damaged due to overheating.

However, the object of the present invention is not limited to the matters mentioned above, and other objects not involved will be clearly understood by those skilled in the art from the following description.

(means to solve the problem)

In order to achieve the technical problem, the air suspension device of an automobile according to an embodiment of the present invention includes: a compressor for compressing air; an air tank for storing the compressed air discharged from the compressor; an air spring for receiving air from the air tank receiving the compressed air to adjust the height of the vehicle body; the controller calculates the displacement of the compressed air discharged by the compressor, and if the calculated displacement of the compressed air is below the set value, the compressor is stopped drive.

And, the control method of the air suspension device of the automobile according to the embodiment of the present invention includes: the first step, in order to make the air spring receive the compressed air stored in the air tank and adjust the height of the vehicle body, calculate the And save the compressed air displacement of the compressor of the air tank; the second step, compare the calculated compressed air displacement with the set amount; the third step, if the calculated compressed air discharge If the gas volume is below the set volume, the compressor will be stopped.

The details of other embodiments have been included in the detailed description and drawings.

(effect of invention)

According to the air suspension device of the automobile and the control method of the air suspension device of the automobile according to the embodiment of the present invention, it is judged whether the compressor is overheated or not by using the discharge volume of the compressed air discharged from the compressor, and there is no need to The compressor is provided with a temperature sensor for measuring temperature.

However, the effects of the present invention are not limited to the above-mentioned effects, and other effects that are not involved will be clearly understood by those skilled in the art through the description of the claims.

Description of drawings

FIG. 1 is a diagram showing an air suspension provided on an automobile according to an embodiment of the present invention,

Fig. 2 is the circuit diagram of Fig. 1,

FIG. 3 is a circuit diagram showing a path where compressed air discharged from a compressor installed in an air suspension of an automobile moves to an air tank according to an embodiment of the present invention,

Fig. 4 is a circuit diagram showing the path where the compressed air stored in the air tank of the air suspension of the automobile moves to the air spring according to an embodiment of the present invention,

Fig. 5 is a control block diagram of a car according to an embodiment of the present invention,

FIG. 6 is a sequence diagram of a control method of an automobile according to an embodiment of the present invention.

Symbol Description

10: Compressor 20: Air Tank

36: Air spring 40: Pressure sensor

70: temperature sensor 80: controller

Detailed ways

The advantages and features of the present invention, as well as the method for achieving them, can be clearly understood by referring to the accompanying drawings and the detailed description of the embodiments. However, the present invention is not limited to the embodiments disclosed below, but can be presented in various forms. The purpose of proposing these embodiments is to make the disclosure of the present invention complete and to fully inform those who have general knowledge in the technical field to which the present invention belongs. The scope of the present invention is defined by the scope of claims. The same reference signs denote the same constituent elements throughout the specification

Hereinafter, an air suspension device for an automobile and a control method for the air suspension device for an automobile according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an air suspension provided in an automobile according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of FIG. 1 .

Referring to Fig. 1 and Fig. 2, the air suspension that is arranged on the automobile according to the embodiment of the present invention comprises: compressor 10, is used for compressing air; Air tank 20, preserves compressed air; Multiple air springs 36, its The height is adjusted according to the pressure of the compressed air stored in the air tank 20, thereby adjusting the height of the vehicle body. A plurality of air springs 36 are arranged to support the vehicle body from the lower side of the vehicle body, and when compressed air is supplied from the air tank 20 , their heights are adjusted so that the height of the vehicle body can be adjusted.

The compressor 10 includes a compressor 12 for compressing air, and a motor 14 for driving the compressor 12 .

The compressor 10 and the air tank 20 are connected through the first flow path 1 , and the plurality of air springs 36 are connected to the first flow path 1 through the second flow path 2 and the adjustment flow path 34 .

The first flow path 1 is connected between the compression unit 12 and the air tank 20 . That is, one end of the first flow path 1 is connected to the compression unit 12 , and the other end is connected to the air tank 20 .

The first flow path 1 is provided with a first on-off valve 21 for opening and closing the first flow path 1 . A single-acting solenoid valve is used as the first on-off valve 21 .

One end of the second flow path 2 is connected to the first flow path 1 corresponding to between the compression unit 12 and the first on-off valve 21 , and the other end is connected to the pressure sensor 40 .

Furthermore, the second flow path is connected to the adjustment flow path 34 . The adjustment flow path 34 is provided in plurality and is connected to a plurality of air springs 36 , respectively. That is, one end of the adjustment flow path 34 is connected to the second flow path 2 , and the other end is connected to the air spring 36 .

The adjustment flow path 34 is provided with an on-off valve 32 for opening and closing the adjustment flow path 34 .

The on-off valve 32 uses a single-acting solenoid valve. Four adjustment channels 34 , on-off valves 32 and air springs 36 are provided.

The four air springs 36 are mounted on the lower arms connected to the wheels of the vehicle respectively, and the upper ends support the vehicle body to absorb shocks and adjust the height of the vehicle body.

The pressure sensor 40 measures the pressure in the circuit formed by the compressor 10 , the air tank 20 , and the air spring 36 . For example, the pressure sensor 40 measures the pressure in the air tank 20 when the first on-off valve 21 is opened, and measures the pressure in the air spring 36 when the on-off valve 32 is opened.

A drying section 50 is provided on the first flowpath 1 between a portion corresponding to one end of the second flowpath 2 connected to the first flowpath 1 and the compression section 12 . The drying unit 50 eliminates moisture in the compressed air flowing through the first flow path 1 .

In addition, a needle valve 60 is provided on the first flow path 1 between a portion corresponding to one end of the first flow path 1 connected to the second flow path 2 and the drying unit 50 . The needle valve 60 decreases the flow rate of the compressed air flowing through the first flow path 1 to increase the speed.

The first flow path 1 is connected to an exhaust flow path 7 for discharging compressed air to the outside. One end of the exhaust flow path 7 is connected to the first flow path 1 corresponding to between the compression part 12 and the drying part 50, and the other end discharges compressed air through the outside. An exhaust hole 7 a that is an end of the exhaust flow path 7 is formed on the outside of the compression unit 12 .

The exhaust flow path 7 is provided with a second on-off valve 22 for opening and closing the exhaust flow path 7 . The second on-off valve 22 is the same as the first on-off valve 21, and a single-acting solenoid valve can be used, but in this embodiment, a pilot valve operated by air pressure is used.

Therefore, in this embodiment, in order to operate the second on-off valve 22, the third flow path 3 connecting the first flow path 1 and the second on-off valve 22 is also provided. One end of the third flow path 3 is connected to the first flow path 1 corresponding to the portion between the first flow path 1 connected to one end of the second flow path 2 and the needle valve 60, and the other end is connected to the second on-off valve. twenty two.

A third on-off valve 23 for opening and closing the third flow path 3 is provided on the third flow path 3 . As the third on-off valve 23, a single-acting solenoid valve is used.

In addition, the air suspension installed in an automobile according to the embodiment of the present invention further includes a fourth flow path 4 for injecting compressed air into an external object. Here, the external objects are tires, pipes, air cushions and the like. The 4th flow path 4, one end is connected to the exhaust flow path 7 between the part of the first flow path 1 corresponding to one end connected to the exhaust flow path 7 and the second on-off valve 22, and the other end is connected to the exhaust flow path 7 corresponding to the part of the first flow path 1 connected to the exhaust flow path 7 The exhaust flow path 7 between the other end of the exhaust flow path 7 and the second on-off valve 22 .

A fourth on-off valve 24 for opening and closing the fourth flow path 4 is provided on the fourth flow path 4 . Furthermore, the auxiliary flow path 8 is provided in the fourth flow path 4, and when only the first on-off valve 21 is opened, the fourth on-off valve 24 is opened according to the air pressure. One end of the auxiliary flow path 8 is connected to a fourth flow path between a part where one end is connected to the exhaust flow path 7 and the fourth on-off valve 24 , and the other end is connected to the fourth on-off valve 24 .

In addition, the air tank 20 is provided with a fifth flow path 5 . One end of the fifth flow path 5 is connected to the air tank 20, and the other end communicates with the outside. A check valve 25 is provided on the fifth flow path 5 . The check valve 25 opens the fifth flow path 5 when the pressure in the air tank 20 is too high.

FIG. 3 is a circuit diagram showing a path through which compressed air discharged from a compressor provided in an air suspension of an automobile moves to an air tank according to an embodiment of the present invention.

Referring to FIG. 3 , to describe the process of storing the compressed air discharged from the compressor 10 in the air tank 20 , the first on-off valve 21 is opened to open the first flow path 1 while the on-off valve 32 is closed. In this state, when the motor 14 is driven, outside air flows into the compression unit 12 and is compressed by the compression unit 12 .

Thereafter, the compressed air passing through the compression unit 12 is dried by the drying unit 50 , and then moved to the air tank 20 to be stored in the air tank 20 . At this time, a part of the compressed air stored in the air tank 20 reaches the pressure sensor 40 through the second flow path 2 , so that the pressure of the compressed air in the air tank 20 can be measured. Also, when the air pressure in the air tank 20 is too high, the check valve 25 opens the fifth flow path 5 to discharge the compressed air in the air tank 20 to the outside.

FIG. 4 is a circuit diagram showing a path through which compressed air stored in an air tank provided in an air suspension of an automobile moves to an air spring according to an embodiment of the present invention.

Referring to FIG. 4 , the first on-off valve 21 is opened to open the first flow path 1 , and the on-off valve 32 is also opened to open the second flow path 2 and the adjustment flow path 34 . Then, the compressed air stored in the air tank 20 sequentially moves to the first flow path 1 , the second flow path 2 , and the adjustment flow path 34 to be charged in the air spring 36 . At this time, part of the compressed air filled in the air spring 36 reaches the pressure sensor 40 through the second flow path 2 , so that the pressure of the compressed air supplied to the air spring 36 can be measured.

Fig. 5 is a control block diagram of an automobile according to an embodiment of the present invention.

Referring to FIG. 5 , the automobile according to the embodiment of the present invention further includes: a temperature sensor 70 and a controller 80 . The temperature sensor 70 is not provided in the circuit illustrated in FIG. 2 . That is, the temperature sensor 70 may be included in other control parts of the vehicle provided around the circuit, and sense the temperature outside the circuit, that is, the atmosphere, and transmit it to the controller 80 .

The controller 80 may be an ECU (Electronic Control Unit-Electronic Control Unit) provided on the vehicle, and it can open and close the valves 21 , 22 , 23 , 24 , and 32 . And, the controller 80 may control the driving time of the compressor 10 using the temperature of the atmosphere sensed by the temperature sensor 70 . For example, when the temperature of the atmosphere sensed by the temperature sensor 70 is high, the controller 80 drives the compressor 10 for a short time in order to prevent overheating of the compressor 10; In this case, the compressor 10 is driven for a long time. Preferably, the controller 80 is preset with a set time for driving the compressor 10 according to each temperature of the atmosphere without overheating the compressor 10 .

Furthermore, the controller 80 stops the compressor 10 when the compressor 10 is in an overheated state. In this embodiment, the controller 80 determines that the compressor 10 is overheated and stops the compressor 10 when the discharge volume of the compressed air discharged by the compressor 10 is less than a set volume. If the compressor 10 is overheated, the discharge volume of the compressed air will be reduced, so the controller 80 calculates the discharge volume of the compressed air discharged from the compressor 10, and if the calculated discharge volume of the compressed air is the preset amount Thereafter, it is determined that the compressor 10 is overheated, and the compressor 10 is stopped.

The controller 80, as illustrated in FIG. 3 , uses the compressed air discharged from the compressor 10 to move to the air tank 20, the pressure in the circuit measured by the pressure sensor 40, and the pressure stored in the air tank 20 as illustrated in FIG. 4 . When the compressed air moves to the air spring 36 , at least one of the pressures in the circuit measured by the pressure sensor 40 is used to calculate the discharge volume of the compressed air discharged by the compressor 10 . That is, as illustrated in FIG. 3 , the controller 80 calculates the compressed air discharged from the compressor 10 using the pressure in the circuit measured by the pressure sensor 40 when the first on-off valve 21 is opened and the on-off valve 32 is closed. exhaust volume. 4, when the first on-off valve 21 is open and the on-off valve 32 is open, the controller 80 calculates the compressed air discharged from the compressor 10 using the pressure in the circuit measured by the pressure sensor 40. exhaust volume.

Preferably, the discharge volume of the compressed air discharged by the compressor 10 according to the pressure in the circuit is preset on the controller 80 .

The control method of the automobile according to the embodiment of the present invention constructed as described above will be described below.

FIG. 6 is a sequence diagram of a control method of an automobile according to an embodiment of the present invention.

Referring to FIG. 6 , the controller 80 drives the compressor 10 when the compressed air stored in the air tank 20 is insufficient or the air inside the air spring 20 is insufficient. However, the time during which the compressor 10 is driven without overheating differs depending on the temperature of the atmosphere. Therefore, the controller 80 differently sets the driving time of the compressor 10 according to the temperature of the atmosphere sensed by the temperature sensor 70 .

First, the temperature sensor 70 senses the temperature of the atmosphere (S1). The controller 80 is provided with a set time for driving the compressor 10 without overheating according to the temperature of the atmosphere sensed by the temperature sensor 70 . For example, if the temperature of the atmosphere is 25° C., the time during which the compressor 10 is driven without overheating, that is, the set time is 1 hour, and if the temperature of the atmosphere is 20° C., the time during which the compressor 10 is driven without overheating is the set time. for 2 hours. That is, a plurality of the set times are set on the controller 80, and the controller 80 selects one of the plurality of set times according to the temperature of the atmosphere sensed by the temperature sensor 70 to drive the compressor 10 (S2) . The controller 80 drives the compressor 10 to calculate the driving time of the compressor 10 .

After that, the controller 80 compares the driving time of the compressor 10 with the selected set time to determine whether the driving time of the compressor 10 exceeds the selected set time (S3). If the driving time of the compressor 10 exceeds the selected set time, it is a condition that the compressor 10 may overheat. The controller 80 continues to drive the compressor 10 when the driving time of the compressor 10 does not exceed the selected set time.

And, the controller 80 calculates the discharge volume of the compressed air discharged from the compressor 10 when the driving time of the compressor 10 exceeds the selected set time (S4). The controller 80 calculates the discharge volume of the compressed air discharged from the compressor 10 using the pressure in the circuit measured by the pressure sensor 40 .

Thereafter, the controller 80 compares the calculated compressed air discharge volume with a preset set volume to determine whether the calculated compressed air discharge volume is equal to or less than the set volume ( S5 ).

Thereafter, when the calculated compressed air discharge volume is equal to or less than the set volume, the controller 80 determines that the compressor 10 is overheated and temporarily stops driving the compressor 10 ( S6 ). Of course, the controller 80 ends the logic when the calculated compressed air displacement is greater than the set amount.

As described above, according to the air suspension device of an automobile and the method of controlling the air suspension device of an automobile according to an embodiment of the present invention, when the discharge volume of the compressed air discharged by the compressor 10 is less than or equal to a preset set volume, , it is judged that the compressor 10 is overheated, the drive of the compressor 10 is temporarily stopped, and the compressor 10 is cooled. Therefore, it is unnecessary to attach a sensor for temperature measurement to the compressor 10 to determine whether the compressor 10 is overheated, and to prevent damage to the compressor 10 .

Those with general knowledge in the technical field to which this specification belongs can understand that this specification can be implemented in other specific forms without changing the technical idea or essential features. Therefore, the embodiments described above are illustrative in all respects and not restrictive. The scope of this specification is shown by the scope of the patent claims described later than the above-mentioned detailed description, and all changes or modifications derived from the meaning and scope of the scope of the patent claims and their equivalent concepts are included in the present invention. within the range.

Claims (10)

1. An air suspension device for an automobile, comprising: compressor, compressed air; an air tank, storing the compressed air discharged from the compressor; an air spring that receives compressed air from the air tank to adjust the height of the vehicle body; and The controller calculates the discharge volume of the compressed air discharged by the compressor, and stops the driving of the compressor when the calculated discharge volume of the compressed air is equal to or less than a set volume. 2. The air suspension device of an automobile according to claim 1, It also includes: a pressure sensor for measuring the pressure in the circuit formed by the compressor, the air tank and the air spring, The controller calculates the discharge volume of the compressed air discharged from the compressor by using the pressure in the circuit measured by the pressure sensor. 3. The air suspension device of an automobile according to claim 2, The controller uses the pressure in the circuit measured by the pressure sensor when the compressed air discharged from the compressor moves to the air tank and the compressed air stored in the air tank moves to the air spring At least one of the pressures in the circuit measured at the same time is used to calculate the displacement of the compressed air discharged by the compressor. 4. The air suspension device of an automobile according to claim 1, Also includes: a temperature sensor that senses the temperature of the atmosphere, The controller selects one of a plurality of set times according to the temperature of the atmosphere sensed by the temperature sensor to drive the compressor, if the driving time of the compressor exceeds the selected set time, Calculate the displacement of the compressed air discharged by the compressor. 5. The air suspension device of an automobile according to claim 4, The controller continues to drive the compressor if the driving time of the compressor is equal to or less than the selected set time. 6. A method for controlling an air suspension device of an automobile, comprising: The first step is to adjust the height of the car body in order to make the air spring receive the compressed air stored in the air tank, and calculate the compressed air displacement of the compressor used to compress the air and store it in the air tank; Step 2, comparing the calculated displacement of compressed air with the set volume; and In a third step, if the calculated compressed air discharge volume is equal to or less than the set volume, the compressor is stopped. 7. The control method of the air suspension device of the automobile according to claim 6, In the first step, after measuring the pressure in the circuit composed of the compressor, the air tank, and the air spring, the discharge rate of the compressed air discharged from the compressor is calculated using the measured pressure. quantity. 8. The control method of the air suspension device of the automobile according to claim 7, In the first step, the pressure in the circuit measured by the pressure sensor when the compressed air discharged from the compressor is moved to the air tank, and the compressed air stored in the air tank is moved to the air spring At least one of the pressures in the circuit measured at the same time is used to calculate the displacement of the compressed air discharged by the compressor. 9. The control method of the air suspension device of the automobile according to claim 6, Before the first step, it also includes: a step of sensing atmospheric temperature; and a step of selecting one of multiple set times to drive the compressor according to the sensed atmospheric temperature; In the first step, if the driving time of the compressor exceeds the selected set time, the discharge volume of the compressed air discharged by the compressor is calculated. 10. The control method of the air suspension device of the automobile according to claim 9, In the first step, if the drive time of the compressor is equal to or less than the selected set time, the compressor is continuously driven.