Luo Yutao

Study on a new split type of HEV powertrains

To remedy the imperfection of the existing power-split type of multi-energy powertrain based on a planetary mechanism for HEV (Hybrid Electric Vehicle), and to increase the power transmittability, efficiency and variable speed range of the CVT (Continuously variable transmission) used with it, a new power-split type of HEV powertrain is here put forward and studied. The working principle of this type of mechatronic assembly is analysed in detail and general and key points for its design and realisation are also discussed. Its technical features and applied perspective are thus revealed.

The rectangular fluctuation control of improved direct torque controlled permanent magnet synchronous machines based on RBF network

In order to solve to the problem of serious torque and flux ripple in motor direct torque control, an amendatory direct torque control method based on the radial basis function neural network technology was presented in this paper. This method can reduce the torque and flux ripple in static run and enhance the performance of low speed. The simulation experimental results indicate that this method may be feasible alternative and high robust capabilities.

REAL-TIME OPTIMIZATION SUPERVISORY CONTROL OF HEV POWERTRAIN

Considering a charge-sustaining PHEV (Parallel Hybrid Electric Vehicle) as an object, the corresponding mechanical and battery constraint functions are established. For real-time controlling, the global criterion is replaced with a real-time one , and a general scheme of real-time power assigning and speed ratio optimizing are given.Based on the math models related to HEVs powertrain, a MATLAB/Simulink simulation platform was built up to calculate ideal tables of power distribution among powertrain elements and the corresponding gear shifts which will be stored into the HEVs onboard supervisory controller. Validity and real time responsibility of the instantaneous optimization control strategy are proved by simulations with typical driving cycles, revealing worthy of the strategy.

Hybrid excitation timing system of Electromagnetic Continuously Variable Transmission

Air-gap magnetic field of electromagnetic continuously variable transmission (EMCVT) is composed by permanent magnet and electromagnetic excitation winding. FEM is adopted to study the three-dimensional airgap magnetic field based on mathematical model. The trust deduced of air-gap magnetic field from FEM is verifield been adjusted by the theoretic prototype. The study shows the magnetic field of EMCVT is high and flexible. The hybrid excitation EMCVT has advantages of permanent magnet electromotor and electromagnetic excitation electromotor, and overcome the shortcoming of them.

Internal Model Control of PM Synchronous Motor Based on RBF Network optimized by Genetic Algorithm

An internal model control method which is based on RBF network optimized by genetic algorithm is proposed to control the speed of the permanent magnet synchronous motor in this paper. As genetic algorithm is a global search and optimization algorithm which simulates the genetic and long-term evolvement process of biology. By the optimization of genetic algorithm, the optimal structure and parameters of the RBF network are achieved and the optimized RBF network is applied into the speed loop internal model control of the permanent magnet synchronous motor. Simulation results show that the proposed internal model controller can overcome the influence caused by nonlinear factor and time varying parameters, and provides the high-performance dynamic characteristics.

A Kind of Thought-The-Ground Hybrid Four-Wheel Drive System

For eliminating the defects of existing hybrid electric vehicle (HEV) powertrains when applied to four-wheel drive vehicles, a novel electro-mechanical driving axle combined through-the-ground hybrid four-wheel drive system is propounded. Through an integrated control strategy between electro-mechanical driving axles, the two axles can drive the vehicle respectively. The functions of differential drive and regeneration are fulfilled by an anti-direction bi-rotor motor (ADBRM) mounted into the electric driving axle. According to the operating principle of the new system, a Matlab/Simulink based simulation platform for the four-mass model and the ADBRM has been constructed. Finally, the simulation results demonstrate some transient output characteristics of the ADBRM in both curve following and slip cases. This output characteristics is much like that of a differential gear, therefore, the feasibility of a differential gearless powertrain is proved by the application of an ADBRM.

Four wheel driving hybrid system based on dual-rotor electric motor

The existing hybrid driving systems are studied.One kind of hybrid four wheel driving system is brought forward that is based on dual-rotor elecuic motor.This system is com- posed of mechanical transaxle and electric transaxle.By syn- thetically controlling of the two transaxles,the vehicle can be driven by either one or both of the two transaxles.The electric transaxle is composed of one dual-rotor electric motor and re- ducer and rotation direction exchange devices.It has the ability of driving,differencing and energy feedback.On the basis of performance theory of the dual-rotor electric motor,the mathe- matic model is established.Furthermore,the simulations of load mutation and swerve are carried out.Taking some sport utility vehicle as an example,the comparison simulation between pro- totype and novel type vehicle is done on the Matlab/Simulation calculating platform.The simulating results show that the driv- ing performance of the novel vehicle is also the same as the prototype vehicle and the fuel economy is better than the pro- totype vehicle.The fuel consumption of the novel vehicle is 10.58% and 21.87% less than the prototype vehicle per 100 km based on the highway and city running cycle.