汽车燃油经济性及动力性与驾驶性客观评价体系

在传统的汽车燃油经济性和全负荷动力性客观评价基础上引入汽车驾驶性客观评价指标体系,重点阐述了驾驶性评价的4个主要方面,即部分负荷特性、加速踏板感觉、换挡平顺性和瞬态急踩/松加速踏板响应.详细分析了纵向加速度响应曲面、加速踏板-加速度线性度、加速度增益、换挡冲击度、加速度均方根值和振动剂量等驾驶性客观指标,并通过线性相关分析验证客观指标与主观评价的一致性.基于多目标性能平衡,构建了整车级别燃油经济性、动力性与驾驶性综合评价体系.以某6速自动挡柴油车型为例,利用AVL CRUISE软件建立车辆纵向动力学性能计算模型,借助AVL GSP(gear shifting program)工具快速生成最佳燃油经济性换挡策略和兼顾油耗、动力与驾驶性约束的综合性换挡策略,对比分析2种不同换挡策略下的燃油经济性、动力性与驾驶性部分客观评价指标,通过定量分析表明了客观评价体系的有效性和实用性.

Objective Evaluation System of Vehicle Fuel Economy, Performance and Drivability

Based on the traditional objective evaluation of vehicle fuel economy and WOT (wide open throttle) performance, the objective characterization of vehicle drivability were proposed, emphasizing on the four main aspects: POT (partial open throttle) response, accelerator pedal feeling, gear shift smoothness and tip in/tip out transient response characteristics. The objective characterization metrics including longitudinal acceleration response map, accelerator pedal acceleration linearity, acceleration gain, shock, acceleration RMS (root mean square), VDV (vibration dose value), etc. were investigated, and the consistencies of objective indicators and subjective evaluations were verified through correlation analysis. The fuel economy, performance and drivability comprehensive evaluation system was established based on multi objective balance. A diesel vehicle equipped with 6 automatic transmission was studied as an example, the vehicle and powertrain models were created based on AVL CRUISE software, and the economical and comprehensive shift strategies were generated based on AVL GSP (gear shifting program) tool, then the fuel economy, performance and drivability were contrasted and analyzed between different shift strategies, the effectiveness and practicability of the objective evaluation system were illustrated quantitatively.