关键词: 商用车；混动；车重；估算方法；实车测试

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