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首页> 外文会议>The automobile in the second decade: sharing all energy solutions >FULL VEHICLE MODELLING FOR COLD START CYCLE FUEL ECONOMY AND EMISSIONS PREDICTION
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FULL VEHICLE MODELLING FOR COLD START CYCLE FUEL ECONOMY AND EMISSIONS PREDICTION

机译：冷启动周期燃油经济性和排放预测的整车建模

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The stricter fuel consumption and emission regulations put the worldwide carmakers andrnsuppliers under pressure to develop more efficient vehicle systems. Simulation-based designrnand virtual prototyping can insure greater product performance and quality of both the timernand cost required by traditional build-and-test approach for the vehicle development processrnin general (1).rnNumerical simulation of the fuel consumption and emissions behaviour of an internalrncombustion engine fitted to a vehicle is today an indispensable aid to development (2). Mostrnsimulation concepts use empirical 1-d models to predict fuel economy and emissions forrnhomologation cycles as well as other cycles. In most cases either the simulations are carriedrnunder steady state warm conditions or simplified warm up models are used for predictingrncold/warm transient cycle results which are data driven and the accuracy is not sufficient.rnIn order to improve the accuracy of vehicle simulation under transient conditions and thusrnpredict fuel consumption, consideration of the complete system engine/drivetrain/vehicle isrnneeded. The coupling of otherwise independent simulation programs therefore becomesrnnecessary for the vehicle and engine.rnIn this work, an integrated approach has been undertaken where the cyclic engine model andrncooling circuit model are incorporated into the vehicle simulation model. AVL Boost hasrnbeen used to simulate the engine model and Flowmaster has been used to build the coolingrncircuit model. The vehicle modelling is done in AVL Cruise. In this approach, Cruise is usedrnto provide the load, operating and environmental conditions of the vehicle to the other 1-Drncodes. Cruise is also used to control the execution sequence and the data exchange betweenrnthe different 1-D software packages.rnThe approach enables us to predict the fuel economy and emissions for a cold start cycle.rnWith this transient online calculation more accurate results can be obtained for various enginernand vehicle outputs.
机译：更加严格的燃油消耗和排放法规使全球汽车制造商和供应商承受着开发更高效的车辆系统的压力。基于仿真的设计和虚拟原型可以确保更高的产品性能和质量，同时也可以确保传统的车辆测试过程所需的时间和成本（1）。rn内燃机燃油消耗和排放行为的数值模拟如今，将其安装在车辆上是发展必不可少的辅助工具（2）。大多数模拟概念使用经验的一维模型预测燃料经济性和排放量，以及其他循环。在大多数情况下，要么在稳态暖机条件下进行仿真，要么使用简化的暖机模型来预测冷/暖瞬态循环结果，这些结果由数据驱动且精度不足。因此，预测燃油消耗时，需要考虑整个系统的发动机/动力传动系统/车辆。因此，对于汽车和发动机而言，否则需要独立的仿真程序的耦合。在这项工作中，已经采取了一种集成方法，其中将循环发动机模型和冷却回路模型合并到了车辆仿真模型中。 AVL Boost已用于模拟发动机模型，而Flowmaster已用于建立冷却回路模型。车辆建模是在AVL Cruise中完成的。在这种方法中，使用Cruise来将车辆的负载，运行和环境条件提供给其他1-Drncode。 Cruise还用于控制执行顺序和不同一维软件包之间的数据交换。该方法使我们能够预测冷启动周期的燃油经济性和排放量。通过这种瞬态在线计算，可以获得更准确的结果。各种发动机和车辆输出。

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