Abstract: Vehicle weight is a key parameter for the effective implementation of the powertrain control strategy in hybrid commercial vehicle, and its estimation accuracy significantly impacts overall fuel economy and ride comfort. The real-time varying driving resistance plays a critical role in the accuracy of vehicle weight estimation, and accurately calculating the dynamic driving resistance is highly challenging. Therefore, this paper proposes a method for estimating vehicle weight without directly computing the dynamic driving resistance. Focusing on a heavy-duty hybrid truck equipped with an 8-speed dedicated hybrid transmission (DHT), a dynamic analysis of the vehicle's shifting process is first conducted, and a mechanical model of the driving system is established to represent both the driving force and dynamic driving resistance. Subsequently, an initial estimation of the vehicle weight is calculated using a continuous iterative optimization approach, and a Kalman filter is applied to refine this initial estimate for convergence. Finally, real vehicle tests are carried out under various loading conditions and multiple real-road scenarios. The results demonstrate that the proposed vehicle weight estimation method can quickly and accurately determine the vehicle weight, with deviations from the actual measured weight consistently remaining within±5%. This approach meets the requirements for the effective implementation of power train control strategies in hybrid commercial vehicle.

Key words: commercial vehicle; hybrid; vehicle weight; estimation method; vehicle test

摘要： 车重是混动商用车动力系统控制策略高效发挥的关键参数之一，其估算精度很大程度 上会影响整车燃油经济性和驾乘舒适性。对车重估算精度起关键作用的就是整车实时变化的 行驶阻力，并且准确计算整车动态行驶阻力的难度很大，因此，文章提出一种利用换挡前后 整车加速度的变化来估算车重的方法。以搭载 8 挡混动专用变速箱（DHT）的混动重卡为研 究对象，首先对车辆动态换挡过程进行动力学分析，建立驱动力和动态行驶阻力的行驶系力 学模型。再次根据持续迭代寻优的方法计算车重原始估算值，并采用卡尔曼滤波方法对原始 估算值进行收敛处理。最后选择不同载重和多种实际道路场景的组合进行实车测试验证。结 果表明，该车重估算方法能够快速的估算出车重值，且估算结果与实际称量车重的偏差基本 稳定在±5%以内，可以满足混动商用车的动力系统控制策略高效发挥的要求。

关键词: 商用车；混动；车重；估算方法；实车测试