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A Fuzzy gear shifting strategy for manual transmissions

机译:手动变速器的模糊换挡策略

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Governing parameters in decision making for gear changing of an automated manual transmission are discussed based on two different criteria, namely engine working conditions and driver's intention. By taking into consideration the effects of these parameters, gear shifting strategy is designed with the application of Fuzzy control method. The controller structure is formed in two layers. In the first layer two fuzzy inference modules are used to determine necessary outputs. In second layer a fuzzy inference module makes the decision of shifting by up-shift, downshift or maintain commands. The quality of Fuzzy controller behavior is examined by making use of ADVISOR software. It is shown that at different driving conditions the controller makes correct decisions for gear shifting accounting for dynamical requirements of vehicle. It is also shown that the controller based on both engine state and driver's intention eliminates unnecessary shiftings that are present when the intention is ignored. A micro-trip is designed in which a required speed in the form of a step function is demanded for the vehicle. Starting from rest both strategies change the gear to reach maximum speed more or less in a similar fashion. In deceleration phase, however, large differences are observed between the two strategies. The engine-state strategy is less sensitive to downshift, taking even unnecessary up shift decisions. The state-intention strategy, however, correctly interprets the driver's intention for decreasing speed and utilizes engine brake torque to reduce vehicle speed in a shorter time.
机译:基于两个不同的标准,即发动机的工作条件和驾驶员的意图,讨论了自动变速箱换挡决策中的控制参数。考虑到这些参数的影响,应用模糊控制方法设计了换挡策略。控制器结构分为两层。在第一层中,使用两个模糊推理模块来确定必要的输出。在第二层中,模糊推理模块通过升档,降档或保持命令来决定换档。使用ADVISOR软件检查模糊控制器行为的质量。结果表明,在不同的驾驶条件下,控制器会根据车辆的动态要求做出正确的换挡决策。还表明,基于发动机状态和驾驶员意图的控制器消除了在忽略意图时出现的不必要的换档。设计了一种微行程,其中要求车辆具有阶跃函数形式的所需速度。从静止开始,两种策略都以类似的方式改变齿轮以或多或少地达到最大速度。但是,在减速阶段,两种策略之间存在很大差异。发动机状态策略对降档不敏感,甚至做出不必要的升档决定。但是,状态意图策略可以正确解释驾驶员降低速度的意图,并利用发动机制动扭矩在较短的时间内降低车速。

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