Based on the mechanism of secondary couple caused by cardan joint, this paper analyzes the reasons for the secondary couple and second-order vibration of a 4WD driveline resulting from cardan joint excitation. According to test results, the paper analyzes the influence parameters, including variation of propeller shafts' angle, selection of joint type, input torque of propeller shaft, and rigid body modes of rear axle, on the second-order vibration. Finally, the paper provides the control methods to reduce the second-order vibration caused by the cardan joints.Keywords Cardan joint Á Second-order vibration Á 4WD Á Rigid body mode of axle Á ODS
IntroductionCurrently, the four-wheel drive (4WD) system is widely used in sports utility vehicle (SUV) due to the increasing demand of fuel efficiency and dynamic performance by customers. Generally, there are two kinds of 4WD systems, one based on the front wheel drive (FWD) system and the other based on the rear wheel drive (RWD) system. The FWD system has been more and more popular. The customers and manufacturers have already paid more and more attention to the noise, vibration, and harshness (NVH) problems caused by the driveline of 4WD vehicle.
Based on the relationship between the motor torque of each side and electric current when the electric vehicle turns, this article puts forward a control scheme of electronic differential which is used to regulate current and control torque, according to the micro electric vehicle with a double-wheel motor driven. In addition, the article makes detailed analysis for the electronic differential control process.
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