The development, modelling and testing of a novel, fuel-efficient hydraulic hybrid light truck is reported. The vehicle used a Digital Displacement^® pump/motor and a foam-filled hydraulic accumulator in parallel with the existing drivetrain to recover energy from vehicle braking and use this during acceleration. The pump/motor was also used to reduce gear-shift times. The paper describes the development of a mathematical vehicle model and the validation of this model against an extensive testing regime. In testing, the system improved the fuel economy of the vehicle by 23.5% over the JE05 midtown drive cycle. The validated mathematical model was then optimised and used to determine the maximum fuel economy improvement over the diesel baseline vehicle for two representative cycles (JE05 midtown and WLTP). It was found that the hybrid system can improve the fuel economy by 24%–43%, depending on the drive cycle. When this was combined with engine stop-start, the system improved the fuel economy of the vehicle by 29%–95%, depending on the drive cycle.

报告了一种新型、省油的液压混合动力轻型卡车的开发、建模和测试。车辆使用的数字位移^®泵/马达和泡沫填充的液压蓄能器与现有的动力传动系统并联，以从车辆制动中回收能量，并在加速过程中使用它。泵/马达还用于减少换档时间。该论文描述了数学车辆模型的开发以及该模型在广泛的测试制度下的验证。在测试中，该系统在 JE05 市中心驾驶循环中将车辆的燃油经济性提高了 23.5%。然后对经过验证的数学模型进行优化，并用于确定两个代表性循环（JE05 中城和 WLTP）对柴油基准车辆的最大燃油经济性改进。结果表明，混合动力系统可以将燃油经济性提高 24%–43%，具体取决于驱动循环。当这与发动机停止启动相结合时，