基于转速控制的柴油机动态特性建模与仿真

Modelling and Simulation of Diesel Engine Dynamic Characteristics Based on Speed Control

为了仿真柴油机动态特性,建立了基于转速控制的柴油机模型.基于台架稳态试验数据计算得到柴油机扭矩MAP图,并通过动态修正方法获得柴油机动态扭矩;划分了柴油机运行状态,采用基于油量的控制方法,分别设计了全负荷、部分负荷和限速工况下的控制策略;在Matlab/Simulink环境下建立了柴油机仿真模型,集成传动相关总成建立整车动力学模型,并进行了两种工况仿真,仿真与试验结果表明:模型设计合理,有效模拟了柴油机稳态及瞬态工况;所提出的建模方法解决了在有限试验数据下的发动机动态特性建模问题,研究结果可为快速建立柴油机动态性能预测模型提供参考.

A diesel model based on speed control was established to simulate the dynamic characteristics of engine.The diesel engine dynamic torque was obtained through dynamic modifying the diesel engine torque MAP,which was calculated based on the data get from steady-state bench test.According to the diesel operating state,the control strategies of full-load,partial-load and speed-limit conditions were designed based on the fuel consumption control.A diesel engine simulation model established in Matlab/Simulink environment was integrated with correlative transmission assemblies to constitute a vehicle dynamic model.And then,diesel engine simulations were carried out in two working conditions.The simulation and experiment results show that,the established model is accurate and effective for the simulation of engine in steady state and transient conditions,and the modeling approach proposed can solve the problem of high-precision modeling in limited test data.This research can provide a reference for quickly predicting the dynamic performance of the diesel engine.