Endocrine Composite Skyhook-Groundhook Control of Electromagnetic Linear Hybrid Active Suspension

Abstract

In order to effectively improve vehicle riding comfort, handling stability, and realize vibration energy recovery, a new kind of electromagnetic linear hybrid active suspension (EMLHAS) integrated with linear motor and solenoid valve shock absorber is put forward. Firstly, for the analysis of the suspension performance, a quarter dynamic model of EMLHAS is established. At the same time, the mathematical models of a linear motor, including the active state and energy-regenerative state, are found. The correctness of mathematical models for the linear motor in the active and energy-regenerative states is verified by means of characteristic tests. Moreover, the velocity characteristic tests of solenoid valve shock absorber are carried out to determine its mathematical polynomial model in the semiactive state. Then, a new kind of multimode endocrine composite skyhook-groundhook control strategy is proposed. The suspension motion is divided into four modes according to the driving conditions of the vehicle. An endocrine control with long feedback and short feedback is combined with the skyhook-groundhook control. The control laws of the skyhook-groundhook controller and endocrine controller are, respectively, designed. Finally, the simulation analysis of suspension dynamic performance and energy-regenerative characteristic is done. The results show the control effect of endocrine composite skyhook-groundhook control is better than that of skyhook-groundhook control, which improves vehicle riding comfort and handling stability. Moreover, part of vibration energy is recovered.

Active Fault‐Tolerant Control Based on the Fault of Electromagnetic Hybrid Active Suspension

“…e structural of EMLHAS system is shown in Figure 1 [26], which includes EMLHAS actuator (composed of linear motor and solenoid valve shock absorber in series), hydraulic damper, coil spring, controller, power module circuit, super capacitor, acceleration sensor etc. e working modes of the EMLHAS can be divided into three modes, which are energy regenerative state, semi-active state and active state.…”

“…e structure of EMLHAS actuator is shown in Figure 2 [26], which mainly includes upper ear, permanent magnet(PM), throttle, solenoid valve shock absorber, piston, hydraulic oil, etc. EMLHAS's linear motor and solenoid valve shock absorber work in different states according to different working modes.…”

“…Two-phase static coordinate changes and two-phase rotation coordinate changes are carried out successively. e space vector relationship of the three coordinate systems is shown in Figure 4 [26].…”

“…After analysis, there is a nonlinear relationship between the damping force, the suspension speed, and the input current of solenoid valve damper. According to the least square method, the correlation expression between the damping force and suspension speed is determined as follows [26]:…”

A Novel Endocrine Composite Fuzzy Control Strategy of Electromagnetic Hybrid Suspension

“…The endocrine composite fuzzy control strategy is based on the mechanism of hormone feedback regulation [30][31]. The endocrine hormone regulating system makes up of the hypothalamus, pituitary and endocrine glands.…”