The suspension system should be able to make the vehicle still have good driving performance when steering at high speed, driving on uneven road surface and sudden acceleration and braking. Many systems adopt overall closed-loop control. The fully active system is very expensive (2500-4000 US dollars), and the hydraulic transmission device used will consume a large part of power and greatly increase the weight. The introduction of these systems does improve the performance of the vehicle, but also greatly increases the cost. Therefore, their application in mass production vehicles is limited. However, many manufacturers have introduced electromagnetic adjustable suspension system. Some of them are installed on the shock absorbers Displacement sensor Many linear accelerometers are used.
The so-called electromagnetic adjustable suspension is a suspension method that uses electromagnetic response to realize the change of vehicle chassis height. It can react in a very short time. To suppress vibration and keep the body stable. Especially in some relatively extreme environments, such as sudden bumps in high-speed driving, the advantages of electromagnetic suspension will be very obvious, and its reaction speed can be 5 times faster than that of traditional suspension.
In terms of system composition, the electromagnetic suspension system is composed of traveling computer, wheel displacement sensor, electromagnetic hydraulic rod and straight tube shock absorber. There is a wheel displacement sensor at the connection between each wheel and the vehicle body. The sensor is connected with the traveling computer, which is connected with the electromagnetic hydraulic rod and the straight cylinder shock absorber. The mystery of electromagnetic shock absorber lies in the electromagnetic oil which acts as damping medium. The electromagnetic fluid is composed of synthetic carbon hydride and fine iron particles. These metal particles will be disorderly distributed in the liquid in the ordinary state, and with the generation of electromagnetic field and the change of magnetic flux, they will be arranged into a certain structure, the viscosity coefficient will also change, and then change the damping. The intensity of electromagnetic field can be controlled only by changing the current. That is to say, the damping coefficient can be controlled only by changing the current.
In fact, this damping process is mainly when the vehicle drives to the bumpy road, causing the wheel to jump, the sensor will quickly send the signal to the control system, the control system will send the corresponding command, the electrical signal will be sent to the electronic coil of each shock absorber, so that the current movement produces magnetic field, under the action of magnetic field, the viscosity of electromagnetic fluid is changed, so as to control the car The purpose of body and shock absorption. And such a complex process is actually only instantaneous. For example, by the time you've read these lines, you've probably done 3000 times. (up to 1000 times per second)
Technical features: advanced technology, rapid response system.
Lack of Technology: high cost, mostly used in luxury models, stability to be tested.
Application models: Audi TT, Cadillac SLS, Cadillac CTS