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As one of automotive engine's important working states, idle-speed has much relation to the engine's fuel consumption and exhaust-gas pollution level. Effective idle speed control (ISC) can improve fuel economy and reduce exhaust emissions, the principal operation of ISC is to uphold the actual engine speed very close to the set point value when any disturbance is added. Automotive engines are typical...
Hybrid electric vehicle use internal combustion engine (ICE) and electrical power, so it has the advantages of strong power, low fuel consumption, low emissions and so on. The research object of this paper is the single-axle parallel hybrid electric bus. In this paper, a hybrid electric vehicle model including vehicle dynamics system, motor system, engine system, battery system, clutch and energy...
This paper explores the design, analysis and simulation of a high speed disk-type (axial flux) permanent magnet (AFPM) synchronous motor. This motor has rated power 0.5 hp at speed of 60,000 rpm used in some special industrial applications. The design of high speed AFPM motor is performed using analytical relations, and sizing of various components including dimensions, magnetic specifications and...
With the aim of improving the shift quality of Hydro-Mechanical Continuously Variable Transmission (HMCVT) of tracked vehicle in turning conditions, with the research object of HMCVT of tracked vehicle, after analysis of the transmission structure and its working principle, and combining the working characteristics of the tracked vehicle in agriculture, the simulation model of the shift process of...
In this work an optimized fuzzy logic control strategy for Hybrid Electric Vehicle energy management is proposed. The dynamic programming algorithm is applied to obtain the optimal power distribution between engine and motor for a given driving cycle. The dynamic programming solution is also utilized for the design of the fuzzy control strategy and acts as benchmarks for comparison. The proposed strategy...
The traditional methods of dynamic modeling for the simulation of hydro-mechanical continuously variable transmission (HMCVT) are cumbersome and complex. The physical simulation models of engine, hydraulic speed regulating mechanism, mechanical speed regulating mechanism and the load were established based on Simscape, and the dynamic characteristics of the components were analyzed in the paper. The...
This paper focuses on methodology of optimization of the torque split and gear shift points in any drive cycle for Hybrid Electric vehicle. The methodology evaluates objective parameter defined at each and every operating point for Internal Combustion Engine (ICE) and electric motor-generator (E-machine) for all possible torque split and gear shift combinations at a particular instant and finally...
This paper presents the methodology and utility of an HEV plant model using Matlab-Simulink for testing the HCU (Hybrid control Unit) logics in dSPACE Hardware-in-loop environment. It also describes how requirements related to Hybrid Controller testing are addressed using the subject plant model. It further discuss about the requirements for Inputs to hybrid controller that are modeled in close loop...
In this paper, control strategy of a plug-in 4 wheel drive car is researched. According to torque request of the car, the steady work state is classified into 10 modes, which consists of 7 drive modes and 3 brake modes. Besides, torque distribution strategy among the power components which realizes basic energy management and torque coordination control which aims at reducing shock extent when mode...
The friction coefficient identification of dry clutch is a precondition for precise model-based dry clutch control. Recursive Least Square with forgetting factors is adopted to identify the friction coefficient of dry clutch during vehicle starting-up process. Because the accuracy of the engine damp coefficient affects friction coefficient identification of the clutch, it is necessary to identify...
Wide-spread use of the model-based design process in automotive powertrain system development is increasing the need for accurate dynamic models. Model-based design inherently requires these models to be rapidly producible and easily verifiable. The High Level Modeling (HLM) approach and corresponding High Level Modeling Tool (HLMT) have been developed in response to these necessities. In this work,...
Conventional engine based vehicles inevitably have complicated structures due to lots of elements. Because of this characteristic, research, development, and also marketing are mainly conducted by the conglomerate, like GM, BMW, Honda, and Hyundai motors, etc. But environmental pollution and fuel exhaustion by the stated vehicle increase the necessity of EV(Electric Vehicle) as a representative of...
Plug-in hybrid electric vehicles (PHEVs) have two energy inputs, the petroleum fuel and electric energy from the utility grid. Due to the different operation costs, the energy management has significant effects on the fuel economy. In this paper, an energy management strategy, stemmed from the AER-focused and blended strategy, is developed. It features the “smart” utilization of the stored electric...
Control problem is investigated for dry clutch engagement process during a standing start in AMT vehicles. Based on the control-oriented simplified driveline dynamic model under consideration of parametric uncertainties of the driveline due to the mechanical wear and tear, the elastic deformation of shaft and so on, an adaptive tracking control strategy is examined paying particular attention to the...
Vehicle energy-saving is important to relieve source shortage and protect environment. This article mainly discusses the control of parallel hydraulic hybrid heavy vehicle (PHHHV), which uses hydraulic components to recycle the brake energy. Through analyzing the two power sources and two brake systems in the PHHHVs, the control rules have been brought out. By logic threshold value control strategy,...
To CVT-based hybrid electric vehicle, this paper proposed a new algorithm for the motor torque. The algorithm can realize smoothness of mode switching from pure electric mode to the engine operating mode. In the CVT speed ratio computing fuction, this algorithm obtain engine pseudo-target speed according to speed and throttle opening. According to the engine output characteristics and throttle opening...
In this paper, the controller is proposed for vehicle start-up process by using Model Predictive Control (MPC) strategy, which considers the state and input variables (engine speed ωe, clutch friction torque Tc and engine torque Te) constraints in the problem formulation. The contradictive requirements of less friction loss and less driveline shock are included in the objective function. The proposed...
Study on the friction torque of diesel engine is quite important to the transient fuel control. For the complexity of the system, there is no effective model the friction torque. After further study on the diesel engine, the friction torque is divided into several components and different model was built for each component. The model is used for multi-cylinder, four stroke engine. In order to prove...
Based on the vehicle kinematical theory, the relationship between road speed and driving resistance of a vehicle with the speed and torque of an engine was analyzed, then, the speed and torque of the powertrain system corresponding to driving cycle was obtained. Numerical models of ICE, ISG, battery and transmission were established. According to backward-facing approach, fuel consumption of HEV with...
A control strategy for mild hybrid electric vehicle was put forward, which was mainly composed of torque distribution and energy management algorithm. The model of control strategy was constructed on the platform of Matlab/Simulink, joined with CRUISE. The co-simulation and analysis was carried on. Consequently, the control strategy and energy management algorithm could be manifested to meet the demands...
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