阅读说明：本技术 一种用于空气弹簧的车桥上跳主动限位方法及系统 (Axle jump active limiting method and system for air spring ) 是由 孙艳新 陈杰 何云江 李俊 石朝阳 王海庆 贺佳鑫 柴培洋 于 2021-08-27 设计创作，主要内容包括：本发明涉及一种用于空气弹簧的车桥上跳主动限位方法及系统,该方法包括：持续探测空气弹簧内的实时压力值；预设空气弹簧触发主动限位的临界压力值；持续将实时压力值与临界压力值比较,若实时压力值大于或等于临界压力值,则向空气弹簧内充气。该系统包括：压力传感器、控制器、高压气源及高度控制阀；压力传感器与空气弹簧连接；压力传感器与所述控制器电性连接；高压气源通过高度控制阀与空气弹簧内部连接；控制器与高度控制阀电性连接,控制器预设空气弹簧触发主动限位的临界压力值；若实时压力值大于或等于临界压力值,则控制高度控制阀开启充气。本发明提供的用于空气弹簧的车桥上跳主动限位方法及系统,可实现车桥的柔性缓冲限位功能。(The invention relates to an axle jump active limiting method and system for an air spring, wherein the method comprises the following steps: continuously detecting a real-time pressure value in the air spring; presetting a critical pressure value for triggering active limit of an air spring; and continuously comparing the real-time pressure value with the critical pressure value, and if the real-time pressure value is greater than or equal to the critical pressure value, inflating the air spring. The system comprises: the device comprises a pressure sensor, a controller, a high-pressure air source and a height control valve; the pressure sensor is connected with the air spring; the pressure sensor is electrically connected with the controller; the high-pressure air source is connected with the inside of the air spring through the height control valve; the controller is electrically connected with the height control valve and presets a critical pressure value for triggering active limit by the air spring; and if the real-time pressure value is greater than or equal to the critical pressure value, controlling the height control valve to open for inflation. The axle jump active limiting method and system for the air spring provided by the invention can realize the flexible buffering limiting function of the axle.)

1. An axle jump active limiting method for an air spring is characterized by comprising the following steps:

continuously detecting a real-time pressure value in the air spring;

presetting a critical pressure value for triggering active limit of an air spring;

and continuously comparing the real-time pressure value with the critical pressure value, and if the real-time pressure value is greater than or equal to the critical pressure value, inflating the air spring.

2. The method for actively limiting axle jounce for an air spring of claim 1 further comprising:

presetting a safety pressure value of an air spring;

continuously acquiring the real-time pressure value according to a set first time interval;

and comparing each acquired real-time pressure value with the insurance pressure value, and stopping inflating the air spring when the real-time pressure value is greater than or equal to the insurance pressure value.

3. The active limit method for axle jounce for an air spring of claim 2 further comprising:

triggering to synchronously start timing when the air spring is inflated;

and if the real-time pressure value is continuously greater than the standard pressure value of the air spring within a set second time interval, controlling the air spring to deflate until the real-time pressure value is equal to or less than the standard pressure value, and stopping deflating.

4. The active limit method for the axle jounce of an air spring as set forth in claim 2, wherein said fuse pressure value is 5-10Kpa greater than said threshold pressure value.

5. The active method of limiting axle jounce for an air spring of claim 2 wherein said first time interval is 0.5-2s and said second time interval is 1-2 min.

6. An axle jump active limit system for an air spring, comprising: the device comprises a pressure sensor, a controller, a high-pressure air source and a height control valve;

the pressure sensor is connected with the air spring and used for detecting a real-time pressure value in the air spring;

the pressure sensor is electrically connected with the controller and uploads the collected real-time pressure value signal to the controller;

the high-pressure air source is connected with the inside of the air spring through the height control valve;

the controller is electrically connected with the height control valve, and the critical pressure value for triggering active limit by the air spring is preset in the controller; and the controller continuously compares the real-time pressure value with the critical pressure value, and if the real-time pressure value is greater than or equal to the critical pressure value, the controller controls the height control valve to open to inflate the air spring.

7. The active limit system for axle jounce for an air spring of claim 6 further comprising: a deflation valve;

the air release valve is connected with the inside of the air spring and used for releasing air of the air spring;

the controller is electrically connected with the deflation valve and used for controlling the deflation valve to open or close.

8. The active axle jounce limiting system for an air spring of claim 7 wherein said controller comprises:

the signal acquisition unit is used for acquiring a real-time pressure value in the air spring from the pressure sensor;

the data comparison unit is used for presetting a critical pressure value for triggering active limiting of the air spring and a standard pressure value of the air spring by the controller; continuously acquiring the real-time pressure value from the signal acquisition unit, and continuously comparing the real-time pressure value with the critical pressure value and the standard pressure value;

the inflation control unit is used for obtaining a comparison result from the data comparison unit, and controlling the height control valve to open to inflate the air spring if the real-time pressure value is greater than or equal to the critical pressure value;

and the air discharge control unit is used for obtaining a comparison result from the data comparison unit, controlling the air discharge valve to open to discharge air to the air spring if the real-time pressure value is continuously greater than or equal to the standard pressure value within a set time range, and controlling the air discharge valve to stop discharging air until the real-time pressure value is equal to or less than the standard pressure value.

9. The active limit system for axle jounce for an air spring as set forth in claim 7 wherein said pressurized air source has a pressure value of 1000-2000 Kpa.

10. The active limit system for axle jounce for an air spring of claim 7 wherein said controller is a PLC controller.

Technical Field

The invention relates to the technical field of automobile manufacturing, in particular to an axle jump active limiting method and system for an air spring.

Background

At present, the limit of the air spring axle jumping up is generally limited by a passive mechanical buffer block, and can be limited by an internal buffer block and an external buffer block according to an arrangement mode. The traditional mechanical limiting method has the defects of poor limiting and buffering effects and short service life of the rubber block.

Disclosure of Invention

The invention provides an axle jump active limiting method and system for an air spring, aiming at the technical problems of poor limiting and buffering effects and short service life of a rubber block in a mechanical limiting method in the prior art.

The technical scheme for solving the technical problems is as follows:

an axle jump active limiting method for an air spring comprises the following steps:

continuously detecting a real-time pressure value in the air spring;

presetting a critical pressure value for triggering active limit of an air spring;

and continuously comparing the real-time pressure value with the critical pressure value, and if the real-time pressure value is greater than or equal to the critical pressure value, inflating the air spring.

Further, the method also comprises the following steps:

presetting a safety pressure value of an air spring;

continuously acquiring the real-time pressure value according to a set first time interval;

and comparing each acquired real-time pressure value with the insurance pressure value, and stopping inflating the air spring when the real-time pressure value is greater than or equal to the insurance pressure value.

Further, the method also comprises the following steps:

triggering to synchronously start timing when the air spring is inflated;

and if the real-time pressure value is continuously greater than the standard pressure value of the air spring within a set second time interval, controlling the air spring to deflate until the real-time pressure value is equal to or less than the standard pressure value, and stopping deflating.

Further, the safety pressure value is greater than the critical pressure value by 5-10 Kpa.

Further, the first time interval is 0.5-2s, and the second time interval is 1-2 min.

The invention also provides an axle jump active limiting system for the air spring, which comprises: the device comprises a pressure sensor, a controller, a high-pressure air source and a height control valve;

the pressure sensor is connected with the air spring and used for detecting a real-time pressure value in the air spring;

the pressure sensor is electrically connected with the controller and uploads the collected real-time pressure value signal to the controller;

the high-pressure air source is connected with the inside of the air spring through the height control valve;

the controller is electrically connected with the height control valve, and the critical pressure value for triggering active limit by the air spring is preset in the controller; and the controller continuously compares the real-time pressure value with the critical pressure value, and if the real-time pressure value is greater than or equal to the critical pressure value, the controller controls the height control valve to open to inflate the air spring.

Further, the method also comprises the following steps: a deflation valve;

the air release valve is connected with the inside of the air spring and used for releasing air of the air spring;

the controller is electrically connected with the deflation valve and used for controlling the deflation valve to open or close.

Further, the controller includes:

the signal acquisition unit is used for acquiring a real-time pressure value in the air spring from the pressure sensor;

the data comparison unit is used for presetting a critical pressure value for triggering active limiting of the air spring and a standard pressure value of the air spring by the controller; continuously acquiring the real-time pressure value from the signal acquisition unit, and continuously comparing the real-time pressure value with the critical pressure value and the standard pressure value;

the inflation control unit is used for obtaining a comparison result from the data comparison unit, and controlling the height control valve to open to inflate the air spring if the real-time pressure value is greater than or equal to the critical pressure value;

and the air discharge control unit is used for obtaining a comparison result from the data comparison unit, controlling the air discharge valve to open to discharge air to the air spring if the real-time pressure value is continuously greater than or equal to the standard pressure value within a set time range, and controlling the air discharge valve to stop discharging air until the real-time pressure value is equal to or less than the standard pressure value.

Further, the pressure value of the high-pressure air source is 1000-2000 Kpa.

Further, the controller is a PLC controller.

The axle jump active limiting method and system for the air spring provided by the invention at least have the following beneficial effects or advantages:

according to the axle jump active limiting method and system for the air spring, provided by the invention, the real-time pressure value in the air spring is continuously detected; presetting a critical pressure value for triggering active limit of an air spring; and continuously comparing the real-time pressure value with the critical pressure value, and if the real-time pressure value is greater than or equal to the critical pressure value, inflating the air spring. The telescopic state of the air spring can be fed back through the pressure value in the air spring, the axle can be judged to jump up when the air spring is compressed to a certain degree, and at the moment, the air spring is rapidly filled with gas through the high-pressure gas source, so that the air spring is prevented from being compressed continuously, and the flexible buffering and limiting function of the axle is realized.

Drawings

FIG. 1 is a schematic structural view of a portion of an axle jump active limit system for an air spring according to an embodiment of the present invention;

fig. 2 is a structural block diagram of an axle jump active limiting system for an air spring according to an embodiment of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below: the system comprises a frame 1, a vehicle axle 2, an air spring 3, a pressure sensor 4, a height control valve 5, a guide arm 6, a controller 7, a signal acquisition unit 71, a data comparison unit 72, an inflation control unit 73, an air release control unit 74 and an air release valve 8.

Detailed Description

The invention provides an axle jump active limiting method and system for an air spring, aiming at the technical problems of poor limiting and buffering effects and short service life of a rubber block in a mechanical limiting method in the prior art.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that terms such as "upper", "lower", "front", "rear", "left", "right", and the like in the embodiments indicate terms of orientation, and are used only for simplifying the positional relationship based on the drawings of the specification, and do not represent that the elements, devices, and the like indicated in the description must operate according to the specific orientation and the defined operation, method, and configuration, and such terms are not to be construed as limiting the present invention.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; may be directly connected or indirectly connected through an intermediate. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in conjunction with specific situations.

First, several terms related to the embodiments of the present invention are explained in order to facilitate better understanding of the embodiments of the present invention. The real-time pressure value is the instantaneous pressure in the air spring and is generally dynamically changed. The critical pressure value is a set fixed pressure value parameter, the air spring corresponding to the critical pressure value is in a compressed state, and the buffer and the limit are required to be intervened at the moment. The safety pressure value is also a set fixed pressure value parameter, the safety pressure value is larger than the critical pressure value, the difference between the safety pressure value and the critical pressure value is the inflation pressure, and the inflation quantity is limited by the safety pressure value. The standard pressure value refers to an air spring pressure value preset when a vehicle leaves a factory or set manually subsequently, and the standard pressure value is usually smaller than a critical pressure value.

Example one

Referring to fig. 1, an embodiment of the present invention provides an axle jump active limiting method for an air spring, including:

and S10, continuously detecting the real-time pressure value in the air spring 3.

The real-time pressure value in the air spring 3 is continuously changed along with the running process of the vehicle, and the step is mainly to dynamically detect the pressure value of the air spring 3 and provide a data base for the subsequent steps.

And S20, presetting a critical pressure value for triggering active limiting by the air spring 3.

The critical pressure value set in this step is a threshold value of the start buffer limit, and the critical pressure value may be set to a specific numerical value or a numerical range.

And S30, continuously comparing the real-time pressure value with the critical pressure value, and if the real-time pressure value is greater than or equal to the critical pressure value, inflating the air spring 3.

The comparison process involved in this step is continuous and needs to be performed every time a real-time pressure value is acquired. When the air spring 3 is inflated, a high-pressure air source is adopted, so that the inflation process can be instantly completed, and the buffer and the limit can be started conveniently.

In order to further control the amount of air charged into the air spring 3 when the buffer limit is started, the embodiment of the invention also comprises the following steps:

and S40, presetting a safety pressure value of the air spring 3.

The safety pressure value is the upper limit of the pressure value in the air spring 3 after the air spring 3 is inflated, and the safety pressure value is greater than the critical pressure value by 5-10 Kpa.

And S50, continuously acquiring a real-time pressure value according to a set first time interval.

For example, the first time interval is set to be 0.5-2s (e.g., 0.5s, 1.2s, or 2s), which should not be too large, and if it is too large, the buffering limit action may be delayed to damage the vehicle; similarly, the time detection should not be set too small, which would increase the computational load and cause data redundancy.

And S60, comparing each acquired real-time pressure value with a safety pressure value, and stopping inflating the air spring 3 when the real-time pressure value is greater than or equal to the safety pressure value.

In this step, the comparison process between the real-time pressure value and the safety pressure value is dynamically performed.

Of course, in the process of inflating the air spring 3, the normal function of the air spring 3 is affected by too much air inflated in the air spring 3 inevitably under certain conditions; based on this, the embodiment of the present invention further includes:

and S70, triggering to synchronously start timing when air is filled into the air spring 3.

And S80, if the real-time pressure value is continuously larger than the standard pressure value of the air spring 3 within the set second time interval, controlling the air spring 3 to deflate until the real-time pressure value is equal to or smaller than the standard pressure value, and stopping deflating.

Wherein the second time interval is 1-2min (such as 1min, 1.5min or 2 min). The second time interval can ensure that the vehicle has already spent the current jump-up action, if the pressure is continuously greater than the standard pressure value, the air spring 3 is inflated too much, and the air spring 3 needs to be deflated to ensure the normal operation of the air spring.

Example two

An embodiment of the present invention further provides an axle jump active limit system for an air spring, referring to fig. 1, including: a pressure sensor 4, a controller 7, a high-pressure air source and a height control valve 5. The lower end of an air spring 3 is arranged on a guide arm 6, the upper end of the air spring 3 is connected with a vehicle frame 1, the vehicle frame 1 is connected with an axle 2, and a height control valve 5 is fixed on the vehicle frame 1. The pressure sensor 4 is connected with the air spring 3, and the pressure sensor 4 is used for detecting the real-time pressure value in the air spring 3. Pressure sensor 4 and controller 7 electric connection, pressure sensor 4 uploads the real-time pressure value signal of gathering to controller 7. The high-pressure air source is connected with the interior of the air spring 3 through the height control valve 5, and the pressure value of the high-pressure air source is 1000-2000Kpa (such as 1000Kpa, 1500Kpa or 2000 Kpa). The controller 7 is electrically connected with the height control valve 5, and the controller 7 presets a critical pressure value for triggering active limit by the air spring 3; the controller 7 continuously compares the real-time pressure value with the critical pressure value, and controls the height control valve 5 to open to inflate the air spring 3 if the real-time pressure value is greater than or equal to the critical pressure value.

In order to prevent the normal function of the air spring 3 from being affected by excessive inflation, the embodiment of the invention is further provided with: and a gas release valve 8.

The air release valve 8 is connected with the inside of the air spring 3 and is used for releasing the air of the air spring 3. The controller 7 is electrically connected with the deflation valve and used for controlling the deflation valve 8 to open or close.

The controller 7 is further described below to clarify the control process of the controller 7: referring to fig. 2, the controller 7 adopts a PLC controller 7, which specifically includes: signal acquisition unit 71, data comparison unit 72, inflation control unit 73, deflation control unit 74, and the like.

The signal acquisition unit 71 is used for acquiring the real-time pressure value in the air spring 3 from the pressure sensor 4.

The data comparison unit 72 is used for presetting a critical pressure value for triggering active limiting of the air spring 3 and a standard pressure value of the air spring 3 by the controller 7; the real-time pressure value is continuously obtained from the signal obtaining unit 71, and the real-time pressure value is continuously compared with the critical pressure value and the standard pressure value.

The inflation control unit 73 is configured to obtain a comparison result from the data comparison unit 72, and if the real-time pressure value is greater than or equal to the critical pressure value, control the height control valve 5 to open to inflate the air spring 3.

The deflation control unit 74 is configured to obtain the comparison result from the data comparison unit 72, and if the real-time pressure value is continuously greater than or equal to the standard pressure value within the set time range, control the deflation valve 8 to open for deflation of the air spring 3, and control the deflation valve 8 to stop deflation until the real-time pressure value is equal to or less than the standard pressure value.

The axle jump active limiting method and system for the air spring provided by the embodiment of the invention at least have the following beneficial effects or advantages:

according to the axle jump active limiting method and system for the air spring, provided by the embodiment of the invention, the real-time pressure value in the air spring is continuously detected; presetting a critical pressure value for triggering active limit of an air spring; and continuously comparing the real-time pressure value with the critical pressure value, and if the real-time pressure value is greater than or equal to the critical pressure value, inflating the air spring. The telescopic state of the air spring can be fed back through the pressure value in the air spring, the axle can be judged to jump up when the air spring is compressed to a certain degree, and at the moment, the air spring is rapidly filled with gas through the high-pressure gas source, so that the air spring is prevented from being compressed continuously, and the flexible buffering and limiting function of the axle is realized.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.