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Automatic Air Suspension System Training Platform

Nov 12, 2021


Basic Introduction

Generally speaking, models equipped with air-type adjustable suspension are equipped with ground distance sensors near the front and rear wheels. According to the output signal of the ground distance sensor, the trip computer will determine the height change of the vehicle and then control the air compression. The engine and exhaust valve make the spring automatically compress or extend, thereby reducing or increasing the ground clearance of the chassis to increase the stability of the high-speed vehicle body or the passability of complex road conditions. 

Background

Since its birth in the mid-nineteenth century, air suspension has experienced a century of development. It has experienced “pneumatic spring-airbag compound suspension → semi-active air suspension → central charge and discharge suspension (ie ECAS electronically controlled air suspension). System)" and many other changes. It was not used in trucks, buses, cars and railway cars until the 1950s. At present, almost all foreign high-end buses use air suspension, and the proportion of heavy-duty trucks using air suspension has reached more than 80%, and the application of air suspension in light vehicles is also rapidly increasing. Some cars are also gradually installing air suspension, such as Lincoln in the United States, Benz300SE and Benz600 in Germany, etc. In some special vehicles (such as instrument vehicles, ambulances, special military vehicles and container transport vehicles that require high shock resistance), the use of air suspension is almost the only option. While my country is still in its infancy, air suspension systems are only used in some luxury passenger cars and a small number of heavy goods vehicles and trailers. In the 1991 Gulf War, the air suspension was composed of fine sand and soft sand because Kuwait was full of desert. The U.S. Army’s Hummer is equipped with a central inflation and deflation system, that is, an air suspension; the tire pressure is reduced to increase the friction between the tires and the ground. This prevents tire skidding in the desert, and reduces the tire pressure on snowy roads. The friction of tires will increase like in the desert. This is the disadvantage of hydraulic suspension. Air suspension and hydraulic suspension have their own advantages. Air suspension can reduce tire pressure and skid resistance, hydraulic suspension can reach high speeds, and can run across mountains and rivers are their respective advantages.

Function

Generally speaking, models equipped with air-type adjustable suspension are equipped with ground distance sensors near the front and rear wheels. According to the output signal of the ground distance sensor, the trip computer will determine the height change of the vehicle and then control the air compression. The engine and exhaust valve make the spring automatically compress or extend, thereby reducing or increasing the ground clearance of the chassis to increase the stability of the high-speed vehicle body or the passability of complex road conditions. In daily adjustments, the air suspension will have several states. 1. Maintain state. When the vehicle is lifted by the lifter and leaves the ground, the air suspension system will close the relevant solenoid valve, and the computer will memorize the height of the vehicle to keep the vehicle at the original height after landing: 2. Normal state, that is, the engine is running. During driving, if the vehicle height changes beyond a certain range, the air suspension system will adjust the vehicle height at regular intervals: 3. Wake up state. When the air suspension system is awakened by the remote control key, door switch or luggage compartment lid switch, the system will check the vehicle height through the vehicle level sensor. If the height of the vehicle is lower than the normal height to a certain extent, the air tank will provide pressure to raise the vehicle to the normal height. At the same time, the air suspension can adjust the hardness of the shock absorber, including three states of soft, normal and hard (also marked as comfortable, normal, and sports three modes, etc.), and the driver can use the control buttons in the car. control.

Of course, compared with traditional suspension, due to the more complicated structure of air-type adjustable suspension, the probability and frequency of failure will be higher than that of coil spring suspension system. Air is used as the power source for adjusting the height of the chassis. Tightness is also a problem. In addition, if the height of the chassis is frequently adjusted, it may cause local overheating of the air pump system, which will greatly shorten the service life of the air pump. Of course, with the continuous improvement of the technical level, many problems have been solved well, and at the same time, the application of car models has become more and more extensive.