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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...
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...
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...
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...
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...
The hybrid electrical vehicle (HEV) has draw researchers' attention recently. This paper mainly discusses the control strategy of HEV based on fuzzy logic. By using this control strategy, the work space and work efficiency of engine are optimized, which play a vital role on improvement of the operation performance of HEV. Meanwhile, the strategy has been applied to optimize the power balance of battery,...
This paper describes a PSIM simulator for the analytical approach of the HEV (Hybrid Electric Vehicle) power train operation. For this research, a series-parallel type HEV (SPHEV) are chosen to apply the Forward-Facing approach simulation method. As the traction power of the series-parallel type HEV can be supplied from both of the ICE (Internal Combustion Engine) and the traction motor, the planetary...
The traction motor of Hybrid Electric Commercial Vehicle(HECV) should have the characteristics such as high power versus weight ratio and very high torque at low speed. So interior permanent-magnet synchronous motor(IPMSM) is suitable for HECV. This paper presents a maximum torque per ampere(MTPA), a field weakening (FW) control and a reduced-order observer of IPMSM for HECV. By using computer simulation,...
A parallel type hybrid-electric bus model is constructed to study hybrid powertrain and its sub-systems. The model is a forward-looking model based on LabVIEW simulation module. The engine, clutch and battery model were specially designed according to the target powertrain. Each part of the model is separately validated by test bench experiment. Part model behavior is compared with that of real target...
The project is a collaboration between the “Polo per la Mobilità Sostenibile” (Pomos) and NOZOMI Motor and it is focused on the hybridization of an off-road vehicle, with 2.2 litres four cylinders petrol engine. The aim is to build an hybrid parallel vehicle with only few simple upgrades. Through these we expect to reduce fuel consumption by 25% and the formation of pollutants. This project provides...
This article firstly describes the principle of control strategy and puts forward a torque-balancing control strategy for the hybrid electric public bus. Based on the designed control strategies, the simulations are carried out and the results are analyzed under different conditions, and the torque-balancing control strategy was improved on the basis of the efficiency-first ideas of the hybrid system...
The aim of this paper is to obtain efficient operation of the components in the series-parallel drivetrain in order to develop an optimal power distribution system. This will be done through the use of efficiency maps of the electric motor and the engine. Based on the information obtained about the speed and torque characteristics, the aim would be to operate the motor and the engine in a defined...
Slipping drive wheels can provide little lateral force, thus when drive wheels are slipping, the front wheel drive vehicles will lose turning ability, while the rear wheel drive vehicles will spin. Compared to the conventional vehicles, HEVs are more easily to slip when driving on slippery road, since the electric motor can provide large drive torque under low speeds. In this paper, the dynamic modeling...
The dual motor powertrain (DMP) configuration is composed of gasoline direct injection (GDI) engine, two motors(one motor connects with input shaft of transmission, namely I-motor, another motor connects with output shaft of transmission, namely II-motor), automatic mechanical transmission (AMT), battery package and hybrid control system. The DMP hybrid system has the functions of engine start/stop...
According to the design requirements, the powertrain dynamic simulation model of an integrated starter/generator (ISG) hybrid electric vehicle (HEV) was established using Simulink. The parallel electric assist control strategy (PEACS) was researched and designed in this paper. The analysis of dynamics performance and fuel economy of the model was carried out under the FTP drive cycle, which can provide...
The intention of the present paper is to draw a reasonable comparison of two different types of electrical machines for use in a parallel hybrid drive train: the induction machine with cage rotor on the one hand, the permanent magnet synchronous machine on the other hand. Both machine types have been designed for application in a mild hybrid vehicle. By dint of simulation models and a total vehicle...
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