Air flow control method based on automobile air suspension system

Abstract

The invention relates to an air flow control method based on an automobile air suspension system, which comprises the following specific steps: S1, acquiring pressure information of each air spring and an air storage tank, and acquiring height information of each air spring; s2, calculating the air quantity in each air spring according to the height and the pressure of the air spring, and calculating the air quantity of the air storage tank according to the pressure and the volume of the air storage tank; s3, adding the air spring air quantity and the air storage tank air quantity to obtain the total air quantity of the system; s4, calculating an ideal gas quantity, a static gas supply threshold value, a dynamic gas supply threshold value, a static exhaust threshold value and a dynamic exhaust threshold value of gas quantity management in real time according to the vehicle load, singly comparing the total gas quantity of the system with the static gas supply threshold value, the dynamic gas supply threshold value, the static exhaust threshold value and the dynamic exhaust threshold value, and judging whether the gas quantity management system is started or not by combining the vehicle speed; by reasonably setting the inflation and deflation threshold values, frequent inflation and deflation of the system are avoided, energy is saved, and the service life of the air pump assembly is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of air suspension systems, and particularly to a gas volume control method based on an automotive air suspension system. Background Art

[0002] An air suspension is a suspension structure that controls the vehicle body height by controlling the pressure of four air springs. The air suspension system consists of four air springs, an air storage tank, an air pump assembly, and connecting pipelines. The air pump assembly can pump the gas in the air storage tank to one or more air springs simultaneously, can also pump the gas in one or more air springs to the air storage tank simultaneously, and can also pump the gas in the atmosphere to the air storage tank. When the vehicle load remains unchanged, the vehicle body will rise by inflating the air springs, and the vehicle body will lower by deflating the air springs. It is common sense that the more gas volume in the system, the better for the suspension to rise, but when the gas volume in the suspension system is too much, it may cause the suspension to fail to lower; the less gas volume in the system, the better for the lowering, but when the gas volume in the suspension system is too little, it may cause the suspension to rise too slowly. Therefore, reasonably controlling the gas volume of the air suspension system has a crucial impact on the performance of the suspension system. In the existing suspension control technology, when the suspension lowers, the gas in the air springs is directly discharged into the atmosphere, and when the suspension rises, the external air is pumped into the air springs by the air pump, resulting in slow rising and lowering speeds of the air springs and long working hours of the air pump, which is not beneficial to the service life of the pump. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a gas volume control method based on an automotive air suspension system, which avoids gas shortage and excess in the system, realizes the optimization of the rising and lowering effects of the air suspension, and by reasonably setting the inflation and deflation thresholds, avoids frequent inflation and deflation of the system, saves energy, and extends the service life of the air pump assembly.

[0004] The technical solution adopted by the present invention to solve its technical problems is: to provide a gas volume control method based on an automotive air suspension system, including the following specific steps:

[0005] S1: Obtain the pressure information of each air spring and the air storage tank, and obtain the height information of each air spring;

[0006] S2: Calculate the gas volume in each air spring according to the height and pressure of the air spring, and calculate the gas volume of the air storage tank according to the pressure and volume of the air storage tank;

[0007] S3: Add the gas volume of the air springs and the gas volume of the air storage tank to obtain the total gas volume of the system;

[0008] S4: Calculate the ideal gas volume, static air replenishment threshold, dynamic air replenishment threshold, static air exhaust threshold, and dynamic air exhaust threshold for gas volume management in real time according to the vehicle load. Compare the total system gas volume with the static air replenishment threshold, dynamic air replenishment threshold, static air exhaust threshold, and dynamic air exhaust threshold individually, and combine with the vehicle speed to determine whether to perform the gas volume management system;

[0009] S5: Execute the gas volume management action to determine whether the actual gas volume of the system reaches the target gas volume.

[0010] If the actual gas volume is less than the static air replenishment threshold in S4, to ensure the normal function of the air suspension, regardless of whether the vehicle is stationary or moving, it is necessary to immediately enter the forced air replenishment mode and pump external air into the air storage tank. During this period, calculate the actual gas volume of the system in real time until the system gas volume is equal to the dynamic air replenishment threshold.

[0011] In S4, when the system gas volume is greater than the static air replenishment threshold and less than the speed-dependent air replenishment threshold and the vehicle speed is greater than the speed-dependent air replenishment threshold, enter the speed-dependent air replenishment mode and pump external air into the air storage tank. During this period, calculate the actual gas volume of the system in real time until the system gas volume is equal to the ideal gas volume. If the vehicle speed is less than the speed-dependent air replenishment vehicle speed threshold during the air replenishment process, the speed-dependent air replenishment mode should be exited and enter the speed-dependent air replenishment mode again after the vehicle speed is greater than the speed-dependent air replenishment vehicle speed threshold.

[0012] In S4, when the system gas volume is greater than the static air exhaust threshold, enter the forced air exhaust mode and discharge the gas in the air storage tank to the external environment. Calculate the real-time gas volume of the system in real time during the air exhaust process until the system gas volume is equal to the ideal gas volume.

[0013] In S4, when the system gas volume is greater than the speed-dependent air exhaust threshold and greater than the static air exhaust threshold and the vehicle speed is greater than the dynamic air exhaust vehicle speed threshold, enter the speed-dependent air exhaust mode. Calculate the actual gas volume of the system in real time during the air exhaust process until the system gas volume is equal to the ideal gas volume.

[0014] Beneficial effects: The present invention relates to a gas volume control method based on an automotive air suspension system, which avoids gas shortage and excess gas in the system, realizes the optimization of the air suspension rising and falling effects, and avoids frequent inflation and deflation of the system by reasonably setting the inflation and deflation thresholds, saves energy, and prolongs the service life of the air pump assembly. Brief Description of the Drawings

[0015] Figure 1 is the flow chart of the present invention;

[0016] Figure 2 is the associated line graph between the gas volume and vehicle load of the present invention. Detailed Embodiments

[0017] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0018] An embodiment of the present invention relates to a gas volume control method based on an automotive air suspension system, as Figure 1 - Figure 2 shown, including the following specific steps:

[0019] S1: Obtain the pressure information of each air spring and the air storage tank, and obtain the height information of each air spring;

[0020] S2: Calculate the gas volume in each air spring according to the height and pressure of the air spring, and calculate the gas volume of the air storage tank according to the pressure and volume of the air storage tank;

[0021] S3: Add the gas volume of the air spring and the gas volume of the air storage tank to obtain the total system gas volume;

[0022] S4: Calculate the ideal gas volume, static air replenishment threshold, dynamic air replenishment threshold, static exhaust threshold, and dynamic exhaust threshold of gas volume management in real time according to the vehicle load, and make a single comparison between the total system gas volume and the static air replenishment threshold, dynamic air replenishment threshold, static exhaust threshold, and dynamic exhaust threshold, and combine the vehicle speed to determine whether to perform the gas volume management system;

[0023] S5: Execute the gas volume management action to determine whether the actual gas volume of the system reaches the target gas volume.

[0024] If the actual gas volume in S4 is less than the static air replenishment threshold, in order to ensure the normal function of the air suspension, whether the vehicle is in a stationary state or a moving state, it is necessary to immediately enter the forced air replenishment mode, pump external air to the air storage tank, and calculate the actual gas volume of the system in real time during this period until the system gas volume is equal to the dynamic air replenishment threshold.

[0025] In S4, when the system gas volume is greater than the static air replenishment threshold and less than the speed-dependent air replenishment threshold and the vehicle speed is greater than the speed-dependent air replenishment threshold, enter the speed-dependent air replenishment mode, pump external air into the air storage tank, and calculate the actual gas volume of the system in real time during this period until the system gas volume is equal to the ideal gas volume. If the vehicle speed is less than the speed-dependent air replenishment vehicle speed threshold during the air replenishment process, the speed-dependent air replenishment mode should be exited, and enter the speed-dependent air replenishment mode again after the vehicle speed is greater than the speed-dependent air replenishment vehicle speed threshold.

[0026] In S4, when the system gas volume is greater than the static exhaust threshold, enter the forced exhaust mode, discharge the gas in the air storage tank to the external environment, and calculate the real-time gas volume of the system in real time during the exhaust process until the system gas volume is equal to the ideal gas volume.

[0027] In S4, when the system gas volume is greater than the speed-dependent exhaust threshold, greater than the static exhaust threshold, and the vehicle speed is greater than the dynamic exhaust vehicle speed threshold, the speed-dependent exhaust mode is entered. During the exhaust process, the actual gas volume of the system is calculated in real time until the system gas volume is equal to the ideal gas volume.

Claims

1. A method for controlling air volume based on an automobile air suspension system, characterized in that: The specific steps include: S1: Obtain the pressure information of each air spring and air tank, and obtain the height information of each air spring; S2: Calculate the amount of air in each air spring according to the height and pressure of the air spring, and calculate the amount of air in the air tank according to the pressure and volume of the air tank; S3: Add the air volume of the air spring and the air volume of the air tank to obtain the total air volume of the system; S4: Calculate the ideal gas volume, static gas replenishment threshold, dynamic gas replenishment threshold, static exhaust threshold, and dynamic exhaust threshold of gas volume management in real time according to the vehicle load, compare the total gas volume of the system with the static gas replenishment threshold, dynamic gas replenishment threshold, static exhaust threshold, and dynamic exhaust threshold, and determine whether to implement the gas volume management system in combination with the vehicle speed; S5: Execute gas volume management actions to determine whether the actual gas volume of the system reaches the target gas volume.

2. The air volume control method based on the automobile air suspension system according to claim 1, characterized in that: In S4, if the actual air volume is less than the static air replenishment threshold, in order to ensure the normal function of the air suspension, regardless of whether the vehicle is stationary or in motion, it is necessary to immediately enter the forced air replenishment mode and pump the outside air into the air tank. During this period, the actual air volume of the system is calculated in real time until the system air volume is equal to the dynamic air replenishment threshold.

3. The air volume control method based on the automobile air suspension system according to claim 1, characterized in that: In S4, when the system gas volume is greater than the static gas replenishment threshold and less than the speed-dependent gas replenishment threshold and the vehicle speed is greater than the speed-dependent gas replenishment threshold, the speed-dependent gas replenishment mode is entered, and the outside air is pumped into the gas tank. During this period, the actual system gas volume is calculated in real time until the system gas volume is equal to the ideal gas volume. If the vehicle speed is less than the speed-dependent gas replenishment speed threshold during the gas replenishment process, the speed-dependent gas replenishment mode should be exited and the speed-dependent gas replenishment mode should be entered again after the vehicle speed is greater than the speed-dependent gas replenishment speed threshold.

4. The air volume control method based on the automobile air suspension system according to claim 1, characterized in that: In S4, when the system gas volume is greater than the static exhaust threshold, the system enters the forced exhaust mode and discharges the gas in the gas tank into the external environment. During the exhaust process, the real-time gas volume of the system is calculated in real time until the system gas volume is equal to the ideal gas volume.

5. The air volume control method based on the automobile air suspension system according to claim 1, characterized in that: In S4, when the system gas volume is greater than the speed-dependent exhaust threshold and greater than the static exhaust threshold and the vehicle speed is greater than the dynamic exhaust speed threshold, the speed-dependent exhaust mode is entered, and the actual system gas volume is calculated in real time during the exhaust process until the system gas volume is equal to the ideal gas volume.

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