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首页> 外文会议>International Conference on Ecological Vehicles and Renewable Energies >Influence of the final drive ratio on the consumption of passenger cars under real driving conditions
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Influence of the final drive ratio on the consumption of passenger cars under real driving conditions

机译：在实际驾驶条件下，最终传动比对乘用车消耗的影响

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The predetermined gear shift points in the type approval test for the European Union (NEDC - New European Driving Cycle) influence the technical design of today's vehicles with manual transmission significantly. Most manufacturers select a long total gear ratio to achieve fuel savings by down speeding. The effects of the final drive ratio on improving fuel consumption in real customer driving, and subjectively perceivable longitudinal dynamics have hardly been considered so far. This paper studies the effect of varying the final drive of a vehicle on its fuel consumption and the driving experience in daily driving. Therefore we analyze two vehicles with different drive trains (Diesel and Gasoline) firstly with their initial and secondly with a modified final drive by applying (a) legally stipulated driving cycles, a aggregated daily driving cycle and (b) constant driving on a chassis dynamometer as well as (c) real driving situations. We quantify the impact of varying the final drive ratios on the fuel consumption in several driving cycles: the NEDC, the Worldwide Harmonized Light-Duty Vehicles Test Procedure (WLTC) and a highly dynamic driving cycle (HDDC), which corresponds to more dynamic driving behavior. Thus this HDDC comprises various route profiles depending on the driver type (city driver, commuter, long-distance driver). Additionally we carried out constantly driving phases at different velocities utilizing a chassis dynamometer to quantify consumption influences. Real driving situations complement these chassis dynamometer testing and enables evaluation of the effects of a higher final drive on the longitudinal driving dynamics in an objective (driving maneuvers) and a subjective manner (comprehensive volunteer study). The final drive has a large influence on the consumption in the NEDC for vehicles with a manual transmission. Real drivers on the other hand, only have a very small consumption advantage with a long total gear ratio. The real consumption effects are clearly better represented by the WLTP. Besides, through the use of shorter final drives the customer-relevant driving dynamics can be significantly improved.
机译：欧盟（NEDC-新欧洲行驶周期）型式认可试验中的预定换挡点会极大地影响当今带有手动变速箱的车辆的技术设计。大多数制造商选择较长的总齿轮比，以通过降低速度来节省燃油。到目前为止，几乎没有考虑过最终传动比对改善实际客户驾驶中的油耗的影响以及主观上可感知的纵向动力学。本文研究了改变车辆的最终驾驶对其燃料消耗和日常驾驶驾驶体验的影响。因此，我们通过应用（a）合法规定的驾驶周期，合计的每日驾驶周期和（b）在底盘测功机上持续驾驶，来分析两种具有不同传动系（柴油和汽油）的车辆的初始传动，其次是经过修改的最终传动。以及（c）实际驾驶情况。我们量化了在几个行驶周期中改变最终传动比对油耗的影响：NEDC，全球协调轻型车辆测试程序（WLTC）和高动态行驶周期（HDDC），这对应于更动态的行驶行为。因此，此HDDC包含各种路线配置文件，具体取决于驾驶员类型（城市驾驶员，通勤者，长途驾驶员）。此外，我们利用底盘测功机以不同的速度不断进行驱动阶段，以量化消耗影响。实际驾驶情况是对这些底盘测功机测试的补充，并能够客观地（驾驶操作）和主观方式（全面的志愿者研究）评估更高的最终驾驶对纵向驾驶动态的影响。对于带手动变速箱的车辆，终传动对NEDC的消耗有很大影响。另一方面，真正的驾驶员在总传动比长的情况下仅具有非常小的消耗优势。 WLTP可以更好地代表实际消费效果。此外，通过使用较短的主减速器，可以显着改善与客户相关的驾驶动态。

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