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In this paper potential causes that lead to a failure are investigated through a digraph analysis utilizing graph theory tools and pseudo boolean expressions. A generic scenario of a multi-layered scheme for fault assessment for a UAV application, illustrates the proposed methodology. The resulting solution is obtained by the use of shortest path algorithms due to the means the problem is posed and...
A finite element model for a domestic car-body is built. Based on the stiffness criterion, the stiffness sensitivity of the whole auto-body structure parts are analyzed under torsion and bending loads. Based on the results, the design of the structure and dimension of the body parts is optimized and the stiffness and sensitivity of the whole body is proved to be more reasonable. The Uniform Design...
100% low floor light rail vehicle (LFLRV) is favored for its small volume, light weight, user-friendly design and its full low floor convenient for all people. 100% LFLRV adopts the structure of independence wheel, which gets rid of the transmission shaft crossing the vehicle in the traditional vehicle, consequently to low the floor. This structure makes the drive control mode obviously differ from...
This article mainly deals with the object oriented online diagnosis system based on analytical redundancy for fuel cell cars. On the basis of the realization of physical modeling language, Using the specific math frame structure and code compilation system, the method transform the analytical redundancy in object-oriented language into real-time operational diagnosis code in embedded object environment...
A dual mechanical port (DMP) machine is a new kind of machine with two rotors. Those in literature can be classified into independent field type, as the fact that there is no effective electromagnetic coupling between different parts in the machine. A new type of DMP machine is presented in this paper, which features as a unified field in the machine. This kind of machine can utilize d-axis current...
The vehicle vibration affects its ride comfort and handling stability. Because the passive suspension has its limitations, many new-type suspensions have emerged as the times require. Active suspension is one of them. The vehicle active suspension based on giant magnetostrictive actuator (GMA) can finish active control of vibration relying on its energy system by actuator, so a good active vibration...
In this paper, a novel model reference adaptive control (MRAC) scheme based on neural network (NN) is proposed for servo system tracking control to achieve high-precision position control. This scheme consists of an MRAC controller and an online NN controller in velocity-loop and a traditional PID controller in position-loop. For reducing influence which arose from modeling error, unknown model dynamics,...
There are many defects in the traditional SPWM inverter, for example, large size, heavy weight, too much noise etc. For these reasons, it canpsilat reach the technical requirements of vehicle hold electrical-source inverter. High frequency inverse technology is used to solve these defects. Dividing inverse process into two parts: DC-DC previa section and SPWM inverse section. The inverterpsilas performance...
A novel flameless electromagnetic heater for the army to heat up ration in field operation is presented in this paper. It uses the hysteresis and eddy current thermal power in the solid iron and the short-circuit current thermal power in the short copper bars to heat up ration. The mathematical model of the flameless heater is given based on the reverse problem of temperature rise and loss in electrical...
The electric vehicle needs the induction motor to run efficiently over the entire speed range, the dynamic torque response should also be good. Based on analyzing vector control and minimum losses control of induction motor, an efficiency optimization strategy of induction motors over wide speed range taking the dynamic torque response into account is presented in the issue. The strategy applies the...
The power train of fuel cell vehicle adopts the hybridization with a fuel cell system and an energy storage system, which can be battery pack or super capacitor pack, in order to improve the fuel economy of the vehicle through regenerative braking and possibly to increase the specific power and to decrease the cost of the power train. The hybrid power train of fuel cell vehicle can be different depending...
In order to improve dynamic performance and reduce switching loss of permanent magnet synchronous motor system in electric vehicle drive, a self-adjusting direct torque control strategy is proposed. Based on the analyses of zero voltage vector in DTC, fuzzy control rules with zero voltage vector are presented to acquire both quick dynamic torque response of PMSM and reduced switching loss of inverter...
This paper presents a novel control scheme for three-level neutral point clamped (NPC) back-to-back converter. The distribution and balance of instantaneous energy for the converter is analyzed, and the direct power control with space vector modulation (DPC_SVM) for front-end rectifier and rotor field oriented control (FOC) for back-end inverter-fed induction motor are adopted respectively. A power...
The EMC design is of vital importance for electronic control modules of high power dc-dc converters to achieve high reliability of fuel cell electric vehicles. This paper focuses on the EMC design of an ARM-based electronic control unit for the high power DC/DC converter. The countermeasures are as diverse as the problems, such as grounding techniques, power lines interference rejection, PCB shielding,...
This paper presents a state-averaged model and an effective control method of a regenerative power storage system to save energy and improve electric network voltage fluctuation in urban railway transit. The regenerative power is stored and then provided to a traction motor by the storage system that consists of an electric double layer capacitors (EDLC) and bi-directional DC/DC converter. We have...
Battery technology is one of the key factors constraining the development of hybrid electric drive system used in all electric combat vehicles (AECV). At present, single energy storage source is very difficult to meet the requirements for both energy and power in AECV. By adopting hybrid energy structure, existing technology can make full use of the advantages of multiple energy and thus enhance the...
Based on the research about the bidirectional buck-boost driver, reasonable projects were proposed to solve the problem that it was hard to recover the braking energy when low speed for super-capacitor electric bus. First, a passive lossless snubber project was designed to reduce the switch loss and protected the switch; the energy during switching transient process was transferred to charge the super-capacitor...
The dual stator winding structure (the power winding and compensating winding) is used to improve the dynamic performance of the induction generator. The constant output voltage of the power winding is kept through the input voltage regulation of the compensating winding. The dual stator induction generator system is controlled by a fuzzy controller for improving dynamic response. The modeling and...
The limitation of most traditional methods of electric vehicle driving data collection is that they depend on techniques which are restricted under finite distance. This paper presents a new data collection and calibration platform based on general packer radio service (GPRS) and INTERNET to collect the driving data of electric vehicles remotely. The platform adopts an in-vehicle device to acquire...
Steering by Wire system is a revolution of steering system structure and function.lt cuts off the mechanical connection between steering wheel and steered wheels ,controls the steering motor to steer front wheels actively so as to improve handling and stabilities and active safety,and controls steering wheel motor to supply the driver with ideal road feel. First, driver-vehicle-road closed loop models...
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