With the rapid evolution of the electric vehicle (EV) industry, torque control has emerged as a critical aspect of EV technology, presenting unique challenges in achieving optimal vehicle performance and efficiency. This paper delves into the challenges of torque control in EVs, particularly during the critical transition phases between driving and braking. We introduce a novel torque filtering control method, meticulously designed to optimise torque rise and fall rates and implement effective torque zero-crossing management. This approach swiftly accommodates the driver's torque requests, while markedly diminishing the impact and noise caused by the reducer gear meshing when the driving and braking conditions switch to each other, thus elevating both vehicle comfort and safety. The method's efficacy was rigorously tested and validated under diverse conditions using a 10-metre pure electric bus, demonstrating notable improvements in vehicle stability and passenger comfort, especially in complex conditions. This research contributes a robust solution to torque control challenges in EVs, marking a significant stride in the technological evolution of electric mobility.

针对某纯电动轻型客车的高压动力系统,分别从主/辅驱系统技术优化及提升高压系统集成度三个方面进行方案改进.经仿真分析,改进方案也满足动力性、经济性指标要求,同时能降本增效.

Hydraulically interconnected suspension (HIS) systems have increasingly drawn attention because of its superiority on improving anti-rollover stability and ride comfort, but due to inevitable inner leakage, the unwanted static tilt of vehicle body caused by the pressure difference between two independent hydraulic circuits limits its application. This tilt problem will greatly reduce the driving safety and even lead to the rollover accident. In this study, a new pressure self-regulating (PSR) device is proposed to address this tilt problem, including its system design, manufacture and experimental validation. The structure and pressure self-regulating principle for this PSR device are introduced in detail first, and the nonlinear model is developed based on mechanical-hydraulic coupling equations. Moreover, the developed model is validated by bench tests; based on this, the parametric analysis is implemented to reveal the impacts of the key parameters of PSR device, including equivalent stiffness and clearance height, on the pressure difference threshold and the time delay. Also, the simulations and experiments from the perspective of the whole vehicle integrated with PSR device are carried out, which demonstrates that PSR device can automatically eliminate the tilt of the vehicle body by balancing the pressure between two hydraulic circuits of HIS system without deteriorating the anti-rollover stability and ride comfort.

Driven by technological innovation and digital evolution, the current automotive industry is standing at the cusp of a transformative era (Liu et al., 2023). As urban centers continue to expand and intensify the demands on transportation networks, the need for solutions to alleviate congestion, boost traffic efficiency, and enhance road safety becomes increasingly urgent. On this occasion, intelligent and connected vehicles, integrating vehicles, infrastructure, and cloud computing, promise a smarter mode of passenger transportation and pave the way for a more interconnected and responsive urban transit ecosystem (Cao et al., 2023). Therefore, traditional passenger buses are on the verge of significant transformation in terms of their functional technologies and operational models. This will bring about a host of benefits such as higher efficiency, better passenger experiences, and safer road environments. This paper provides a comprehensive outlook on intelligent and connected passenger buses (ICPBs), delving into the integrated vehicle-road-cloud platform and highlighting the key technologies that will shape the future bus system. As illustrated in Fig. 1, it showcases the key perspectives on the future of ICPBs.

Variable damping shock absorbers have received extensive attention for their efficient vibration reduction performance, and air springs have also been widely used in high-end commercial vehicles due to their nonlinear stiffness characteristics. This paper presents a novel semi-active cab suspension integrated with an air spring and a variable damping electromagnetic damper (A-EMD). The electromagnetic damper (EMD) prototype was designed, manufactured and tested. Then, due to the interference of nonlinear stiffness characteristics of the air spring with the controller in the subsequent design, the Takagi–Sugeno fuzzy method was adopted to segmentally linearize its nonlinearity, based on which an H∞ state feedback semi-active controller was designed to control the EMD to generate variable damping force. Furthermore, a Luenberger state observer was designed to provide immeasurable state parameters for the controller. Numerical simulations were carried out to validate the effectiveness of the proposed approaches, and the results show that the proposed control strategy can significantly improve the ride comfort of the A-EMD system. The vibration dose value (VDV) acceleration under the bump road and the frequency-weighted acceleration root mean square (FWA-RMS) under the random road decreased by 36.05% and 19.77%, respectively, compared with the passive suspension system.

The authors propose a torque filtering control method for electric vehicles and conduct the vehicle verification,which can quickly respond to driver torque requests and reduce the impact and noise caused by the reducer gear meshing when the driving and braking conditions switch to each other in order to improve the vehicle comfort.

对某城市客车转向机支架进行了强度和刚度分析,然后进行拓扑优化和结构优化设计,轻量化效果较好.

以某8m纯电动客车为研究对象,提出一种新型电制动能量回收方案,并对实施该方案的整车制动平顺性及经济性进行效果验证.

采集不同驾驶特性数据,并分析驾驶特性对车辆能耗的影响,提出兼顾不同驾驶特性以降低车辆能耗的控制策略优化措施.

为解决混合动力汽车AMT并联插电式系统选型与控制难题,文章提出了一种基于道路实际工况的参数计算与动力系统匹配方法,通过道路典型工况下各动力部件工作区间仿真,完成理论计算参数的优化;通过设计与部件效率特性相匹配的系统多模式切换与离合策略,实现系统燃油经济性与行驶平顺性的提升.

根据插电式混合动力城市客车对储能系统较高的性能与使用寿命要求,提出基于超级电容与锂电池构成复合储能系统的解决方案.通过分析与计算,确定复合储能构型及参数,并通过测试验证其使用效果.

With the bus dynamic requirement and the motor output characteristic feature, the peak parameters of motor was attained. The commonly used range of the motor is decided by the actual data which is collected from the running bus in different city. This paper propose that the peak parameters of the motor can be met by the overload capacity in order to reduce the price, weight and dimension.

The paper introduced the principle and structure of range-extended electric vehicles by analyzing the character-istics of the bus conditions,the control strategy design scheme of Range-Extended electric vehicles was put forward.Created model and simulation analysis in Cruise simulation software,the results showed that the Range-Extended electric bus can a-dapt to the bus working conditions,reduce operating costs,and optimized battery operating conditions.

Along with the rapid increasing number of electric / hybrid vehicles, how to manage the vehicles effectively has become a hard work. It's important to collect real-time data for improvement of vehicles next. The paper describes the real-time monitoring of new energy vehicles and data acquisition system, which can achieve electric / hybrid vehicle operation statistics, real-time monitoring and data collection help enterprises to manage the new energy vehicle easily.