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In order to improve the vehicle smoothness, the 3-DOF analysis physical and mathematical models of a vehicle and seat air-spring suspension system were established. Based on the linear stochastic optimal control theory (LQG), use the signal of road's output as excitation source to design the optimal law of this feedback control system. Application of MATLAB simulation programming language was designed...
Traffic congestion frequently occurs at main roads in Japan. Traffic congestion causes economic loss and makes energy efficient worse. Therefore untying traffic congestion is required. In Japan, vehicle information and communication system (VICS) is famous for a congestion avoidance system. However, VICS depends on infrastructures. On the other hand, vehicle ad hoc networks (VANETs) are independent...
Like most reliability and risk analyses, a Probabilistic Risk Assessment (PRA) is most effective when it can be used to influence design decisions in a timely manner. However, development of a PRA can be very resource consuming and its development typically lags design milestones, limiting its usefulness to that of a design verification tool. As the case study described in this paper shows, using...
The Safe following distance is closely associated with vehicle braking process. The braking process consists of three stages. The key problem in this research area is to quantitatively describe each stage. In this paper a framework is presented to model the safe following distance by analyzing the braking process. In this framework we focus on the third braking stage, continuous braking stage, where...
In this paper, a fuzzy steering control strategy is presented for the dual-motor electric tracked vehicle. The strategy is devoted to the steering dynamic process; altering the control the dual motors' torque outputs such that the vehicle can answer the driver's steering operation more rapidly. The two inputs of fuzzy algorithm are the driver's steering wheel angel and its differential coefficient,...
In order to provide the dual-motor drive electric tracked vehicle with the capacity of steering when braking, analyzed steering dynamics and mainly researched the characteristic of the turning radius, proposed a torque control strategy for steering in braking process. The motor's brake torque of each side is controlled according to inputs signals from driver's steering wheel and braking footplate...
This paper introduces a new control scheme for active steering of vehicle. An ideal reference model followed by the four-wheel steering (4WS) vehicle is established resulting from the front-wheel steering (FWS) vehicle, and an H∞ optimum controller for the 4WS vehicle is designed based on model following technology. The dynamic simulation is performed to verify control effect of the H∞ controller,...
Electrotic Power Steeritg system is a closed loop cottrolled steeritg system came to use a few years ago. It this paper the performatce of EPS system is studied to geterate assist torque it differett types of drivitg situati ots. As assist torque is depetd ot vehicle velocity atd steeritg w heel's torque, these two are used as cottroller's itput.
In this paper we simulated 24 GHz short range, wide band automotive radar. The simulation was done using matlab. The main objective of this work is to reduce traffic accidents and potential danger that faces the driver and the vehicle as a result of the sudden collision. The model consist of six sensors distributed in different sides of the car, these devices provide exact measurement of distance...
In modern automobiles, the driver's accelerator pedal position is fed to an electronic control unit, which has traditionally interpreted this pedal input as desired throttle angle but can interpret the pedal position in other ways as well. In this paper, we consider three interpretations of pedal position, namely desired throttle angle, desired net engine torque, and desired wheel torque. We design...
The determination of the motor and battery specification is one of the major challenges in the electric vehicle designs, specially considering the different kinds of requirements and specifications in different designs. This paper discusses about a method of simulating a vehicle in given terrains and driver models for extracting the torque, power and battery usage; and hence get the most optimized...
Congested traffic conditions are a daily nuisance of modern life. Reduction of these congestions will lead to a less stressful and healthier commute. Before mitigating solutions can be obtained, the problem needs to be understood and analyzed. Exact solutions based on probability theory and queuing systems are difficult to obtain for even moderately complex systems. Further for complex systems, insight...
Electric Power Steering (EPS) has important significance in improving the auto's dynamic and static performances. This paper deals with the mathematical model and characteristic curves of EPS System. First, the principle and structure of EPS are discussed. Then the characteristics of EPS system are analyzed, including the typical power curves which deal the relationship of the assist torque and the...
This paper proposed a new risk assessment approach based on probability theory and presented corresponding warning strategy for intersection collision avoidance system. Simulation evaluation method was also addressed and evaluation criterions were improved. After an introduction of background and related works of risk assessment for intersection collision avoidance system, a probability model was...
In this paper, it is shown that synthetic images can be used to test specific use cases of a lane tracking algorithm which has been developed by Audi AG. This was achieved by setting up a highly configurable and extendable simulation framework ldquovirtual test driverdquo. The main components are a traffic simulation, visualization and a sensor model which supplies ground truth data about the street...
New driver assistance systems can have consequential effects on traffic flow. Investigative simulations are necessary for the design, optimization and evaluation of these assistance systems. Previous calibration and validation methods utilized either microscopic or macroscopic measurement data.This paper's purpose is to argue that the formerly held calibration and validation perspectives with regard...
Todaypsilas vehicles include a complex network of programmable electronic control units with software components. A vehiclepsilas electric and electronic (EE) architecture has to be modeled in an early design phase to evaluate design alternatives. The tool PREEvision offers possibilities to model EE-architectures considering feature function networks, function networks, component networks as well...
Electric power steering system (EPS) is a new power steering technology for vehicles. It has been used to replace traditional hydraulic power steering system (HPS). In this paper, an optimal control modeling and simulation design is presented for the column assist type EPS system with a brushed motor based on Matlab. Assisted characteristic chart of the system and block diagram of EPS are presented...
Characteristics of clutch engagement at different engagement stages were different, so different control methods were used in different stages. At quick engagement stage proportional control was used. Control system of starting acceleration stage was serious non-linear and it was difficult to establish precise mathematical model, so fuzzy control was adopted. At synchronization engagement stage clutch...
Transport systems play critical role in modern day economies and are prime example of highly dynamic complex systems. Current traffic monitoring systems do not provide timely and granular information which could sufficiently meet system analysis requirements. Simulation augmented with virtual reality (VR) has emerged as an important methodology to model and analyze transport systems. This paper-reports...
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