Automation

Longitudinal Sliding Mode Control

by with No Comment AutomobileElectric Vehicles

Longitudinal Cruise Control of a Car using Sliding Mode Approach

From the last few years, there has occur an increase in number of cars, which has badly affected our transport system and specially traffic on the roads. Traffic congestion and traffic accidents are the major concerns due to an increase in number of vehicles. Many efforts have been made in the last few years to improve safety and comfort in vehicular system. One of present focus is intelligent transport system (ITS) to ensure safety and comfort for the passenger. The main focus of this paper is to control the longitudinal dynamics of a vehicle, which make sure that a safe distance is kept between the leading and following vehicle. The major drawback with the existing control techniques is the inability to perform well in the presence of various parameters, which vary with the variation in the external factors like temperature and etc. This paper focuses on the development of a sliding mode control (SMC) for the longitudinal dynamics of automotive vehicle in a platoon system. System response will be observed in the presence of parametric uncertainty. First order and Second order sliding mode is applied and results are compared by comparing chattering in both the cases.

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Torq

Optimized Genetic Powertrain Controller

by with No Comment AutomobileElectric Vehicles

Genetic algorithms optimized multi-objective controller for an induction machine based electrified powertrain

In electrified powertrain control, meeting the torque demands and ensuring efficient Electrical Machine (EM) operations are two essential but conflicting demands. A multi-objective Linear Parameters Varying (LPV) controller is proposed to address the problem of these conflicting objectives. The synthesis of multi-objective controller is based on the selection of optimal weighting functions optimized by Genetic Algorithm (GA). The effectiveness of the proposed controller is tested and evaluated for an electrified powertrain operating in a standard urban driving cycles. The stability of the proposed Multi-Objective Controller (MOC) is established. The nonlinear simulation of the proposed controller delivers the robust performance and better efficiency of an EV Induction Machine (IM) based electric drive over the entire driving cycle.

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EV

Guidance of air vehicles

by with No Comment AutomobileElectric Vehicles

A sliding mode approach

This paper presents a novel nonlinear guidance scheme for ground track control of aerial vehicles. The proposed guidance logic is derived using the sliding mode control technique, and is particularly suited for unmanned aerial vehicle (UAV) applications. The main objective of the guidance algorithm is to control the lateral track error of the vehicle during flight, and to keep it as small as possible. This is achieved by banking the vehicle, that is, by executing roll maneuvers. The guidance scheme must perform well both for small and large lateral track errors, without saturating the roll angle of the vehicle, which serves as the control input for the guidance algorithm. The limitations of a linear sliding surface for lateral guidance are indicated; a nonlinear sliding surface is thereafter proposed which overcomes these limitations, and also meets the criterion of a good helmsman. Stability of the nonlinear surface is proved using Lyapunov theory; control boundedness is also proved to ensure that the controls are not saturated even for large track errors. The proposed guidance law is implemented on the flight control computer of a scaled YAK-54 UAV and flight results for different scenarios (consisting of both small and large errors) are presented and discussed. The flight test results confirm the effectiveness and robustness of the proposed guidance scheme.

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