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首页> 外文会议>EAEC European automotive congress >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：冷启动循环燃料经济性和排放预测的全车造型

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The stricter fuel consumption and emission regulations put the worldwide carmakers and suppliers under pressure to develop more efficient vehicle systems. Simulation-based design and virtual prototyping can insure greater product performance and quality of both the time and cost required by traditional build-and-test approach for the vehicle development process in general (1). Numerical simulation of the fuel consumption and emissions behaviour of an internal combustion engine fitted to a vehicle is today an indispensable aid to development (2). Most simulation concepts use empirical 1-d models to predict fuel economy and emissions for homologation cycles as well as other cycles. In most cases either the simulations are carried under steady state warm conditions or simplified warm up models are used for predicting cold/warm transient cycle results which are data driven and the accuracy is not sufficient. In order to improve the accuracy of vehicle simulation under transient conditions and thus predict fuel consumption, consideration of the complete system engine/drivetrain/vehicle is needed. The coupling of otherwise independent simulation programs therefore becomes necessary for the vehicle and engine. In this work, an integrated approach has been undertaken where the cyclic engine model and cooling circuit model are incorporated into the vehicle simulation model. AVL Boost has been used to simulate the engine model and Flowmaster has been used to build the cooling circuit model. The vehicle modelling is done in AVL Cruise. In this approach, Cruise is used to provide the load, operating and environmental conditions of the vehicle to the other 1-D codes. Cruise is also used to control the execution sequence and the data exchange between the different 1-D software packages. The approach enables us to predict the fuel economy and emissions for a cold start cycle. With this transient online calculation more accurate results can be obtained for various engine and vehicle outputs.
机译：更严格的燃料消耗和排放法规将全球汽车制造商和供应商在压力下进行，以开发更高效的车辆系统。基于仿真的设计和虚拟原型可以确保一般（1）的传统构建和测试方法所需的时间和成本的更大产品和成本（1）。拟合到车辆的内燃机的燃料消耗和排放行为的数值模拟是对发展的不可或缺的辅助（2）。大多数仿真概念使用经验1-D模型来预测燃料经济性和用于同源循环的燃料经济性和排放。在大多数情况下，仿真在稳态温暖条件下携带或简化的预热模型用于预测数据驱动的冷/热瞬态循环结果，并且精度是不够的。为了提高瞬态条件下车辆模拟的准确性，从而预测燃料消耗，需要考虑完整的系统发动机/动力传动装置/车辆。因此，车辆和发动机所必需的偶然的独立模拟程序的耦合。在这项工作中，已经进行了一种综合方法，其中循环发动机模型和冷却电路模型结合到车辆仿真模型中。 AVL Boost已被用于模拟发动机型号，并且FlowMaster已被用于构建冷却电路模型。车辆建模在AVL巡航中完成。在这种方法中，使用巡航来向其他1-D代码提供车辆的负载，操作和环境条件。巡航还用于控制不同1-D软件包之间的执行序列和数据交换。该方法使我们能够预测冷启动周期的燃料经济性和排放。通过这种瞬态在线计算，可以获得更多的精确结果，可以获得各种发动机和车辆输出。

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