How to improve vehicle handling? Analytical electromagnetic levitation technology

Today, some models of Ferrari, Audi, Honda and even Land Rover are equipped with MRC suspension. Let's take a look at these models with MRC suspension. Cadillac: Cadillac is the earliest manufacturer of electromagnetic levitation, and there are relatively many models equipped with electromagnetic levitation. At present, both Saiwei sls and Escalade have models equipped with electromagnetic suspension. The latest generation Cadillac models ATS, CTS and XTS, which will be listed in China, will also use electromagnetic suspension on a large scale. Ferrari: As an automobile manufacturer specializing in the production of supercars, many Ferrari models adopt electromagnetic levitation technology. The latest third-generation SCM electromagnetic suspension system gives Ferrari excellent handling performance. Through the knob on the steering wheel, you can manually control the suspension characteristics and show the charm of super running. Audi: The electromagnetic suspension used in Audi cars is called AMR (Audi Magnetic Ride). AMR electromagnetic suspension is now mainly equipped on Audi R8 and Audi TTS. Audi's electromagnetic suspension shock absorber, like Cadillac, is produced by BWI company. Acura: Electromagnetic suspension is not the patent of European and American brands. On the American version of MDX and ZDX, there are models equipped with electromagnetic suspension. Land Rover: 20 12 Aurora has models with electromagnetic suspension, which can automatically adjust the soft and hard comfort of shock absorption according to road conditions. Unfortunately, the function of 20 13 aurora has become optional. ● The basic principle of active electromagnetic suspension The ordinary shock absorber has a sealed cavity with a piston in it. Hydraulic oil is filled in the cavities on both sides of the piston, and the piston is provided with throttling holes. When the piston rod pushes the piston to move in the sealed cavity, the hydraulic oil flows from the high-pressure side to the low-pressure side through the orifice, thus restraining the compression and rebound of the coil spring and realizing the function of vibration reduction. Generally speaking, the damping characteristics of this kind of shock absorber are fixed. The modified shock absorber can adjust the hardness of the suspension shock absorber through the knob at the bottom. Manual operation is required for adjustment, and it is generally impossible to adjust when driving. Therefore, the damping characteristics of this kind of shock absorber can not be adjusted in real time for specific road conditions. The core component of electromagnetic levitation is an electromagnetic levitation shock absorber filled with magnetorheological fluid. The general structure of electromagnetic suspension shock absorber is similar to that of traditional suspension shock absorber. However, magnetorheological fluid is used instead of traditional hydraulic oil in electromagnetic suspension shock absorber. The piston is also provided with a coil. When the coil is energized, a magnetic field can be generated, which changes the properties of the magnetorheological fluid located in the throttle hole, thus changing the "hardness" of the electromagnetic suspension shock absorber. The greater the current through the coil, the harder the suspension. To give you an intuitive understanding of MR fluid, please watch the following video. Demonstration of magnetorheological fluid in Cadillac XTS active electromagnetic suspension ● Performance advantages of active electromagnetic suspension The handling of vehicles using electromagnetic suspension is better than that of ordinary suspension. In vehicle dynamics analysis, the vehicle with electromagnetic suspension has faster steering response and higher speed. However, in the step test of steering wheel angle, the trajectory of the vehicle with electromagnetic suspension is shorter, which shows that the vehicle has better maneuverability. In the vehicle cornering performance test, the electromagnetic suspension adjusts the suspension damping value thousands of times per second to enhance the supporting force of the vehicle suspension when cornering, enhance the lateral grip of the tire and reduce the body roll. In the acceleration test of bumpy road surface, the electromagnetic suspension limits the body jump and makes the tire contact with the ground at all times to obtain a shorter acceleration time of 100 kilometers. Electromagnetic suspension has good performance, but its comfort is improved compared with traditional suspension. Electromagnetic suspension has obvious advantages over traditional suspension in filtering low-frequency vibration of car body and high-frequency road noise. Summary: The car equipped with electromagnetic suspension can dynamically adjust the stiffness of suspension according to road conditions and driving style, and it has higher curve limit and better ground adhesion on bumpy roads. In addition to improving the handling performance of the vehicle, the electromagnetic suspension is superior to the traditional suspension in comfort and filtering the vibration transmitted from the road surface to the vehicle body. With the popularization of Cadillac, the technology of electromagnetic levitation will become more and more popular.