Translated Abstract
Improving fuel economy and reducing emissions are a major challenge that automotive industry faces at present without sacrificing dynamic performance of the vehicle. As a dual-energy vehicles, hybrid vehiclesrelies highly energy control strategy to reduce fuel consumption and emissions.Under the premise of enough dynamic performance, the main goals of the energy control strategy isto optimize the operating characteristics of the engine ,ensure the engine to work in efficient district with the lowest fuel consumption and emissions as much as possible, and make the electric drive system work at maximum efficiencyat the same time. while decelerating, coasting or braking,the car can achieve efficient recovery of braking energy.The recovered energy oftraditional hybrid vehicles is mainly used for car starting, accelerating and driving in pure electric, to save fuel consumption. If the limited energy is used to supplementthose less efficient transient conditions, fuel-efficient rate is better than traditional hybrid vehicles, and the limited energy can save more fuel.For the goal of improving the fuel economy of the engine,this will combine actual engineering development topics, study combustion harsh transient conditions and provide a theoretical basis for the BSG hybrid car HCU-EMS control system development.This paper research contents include:(1) NEDC road cycling were made tests on the drum and record the signal relatedto engine toanalyze vehicle transient operating conditions. Then by analyzing ignition advance angle changes, wecan determine the transient conditionsburning is whether harsh. So we can develop energy control strategyfor combustion harsh transient conditions.(2) Based on knowledge of vehicle dynamics, using software Simulink made the model of car brake energy recovery system.And, simulation of brake energy recovery is made based on the NEDC road cycle. Programs and assumptions were set in accordance with this article, in one NEDC road cycle of 1180s, energy generated by engine was 2043.9Wh, recovery of braking energy by BSG motor was156.41Wh, and brake energy recovery efficiency of BSG motor was 7.65%.(3) According to test and simulation data, motor provided alternative torque to transientconditons on the basis of strategy. These transient conditonsare torque reserved after engine starting,replacement gear on acceleration, isokinetic driving after acceleration, off the oil ondeceleration, idle transition phase, idle taxiing stage and idling stopmotor stage.Statistics on the frequency and timing of various transient conditions were made in the the NEDC road cycle on the same time,engine fuel consumption of the actual process of this part was calculated,and power consumption was calculatedwhen BSG motor provided alternative torque.(4) On basis of the strategy of BSG motor providing electrical torque, through the comparison of saving rate of transient conditions, idle transition phase obtained the highest saving rate, each 1Wh electricity could save 0.66ml fuel. the fuel economy of these transient conditionsrate is higher than the saving rate of normal driving. BSG motor provided alternative torque to transient conditions on one NEDC cycle, saving fuel consumption was 72.9ml. On the entire NEDC cycle car driving Journey was 11.46km, seen in proportion, 100 kilometers 0.636Lfuel was saved, 100 km fuel economy rate was 8%.
Translated Keyword
[Hybrid carsTransient conditionsControl strategiesIgnition timingFuel consumption]
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