The new version of GB 13057-2023 Strength of seats and their anchorages of passenger vehicles has been released on September 8,2023,which will be officially implemented on January 1,2024.This paper introduces the background and main content of the revision of this standard.
The paint film orange peel refers to the uneven orange peel defect on the coating surface,which seriously affects the appearance quality of the bus body.This paper discusses the influencing factors of the paint film orange peel,tests from the aspects of the substrate surface roughness,the number of varnish spra-ying ash scraping process,and proposes measures to improve the performance of the coating orange peel ac-cording to the results.
With the continuous increase of electronic equipment for electric vehicles,the problem often hap-pens that the vehicle cannot start due to the lead-acid battery power shortage.This paper presents a scheme of the lead-acid battery recharge based on the power battery controlled by the vehicle controller,describes the system architecture,control software strategy,safety control strategy and real testing data analysis of the scheme in detail.The scheme has a good effect in practical application.
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.
This paper develops an intelligent diagnostic software applied to new energy buses.This software has multiple functions such as data flow monitoring and storage,expert fault diagnosis,and off-line detec-tion,which can effectively improve debugging efficiency,off-line detection efficiency,and after-sales serv-ice efficiency.
In order to realize the hybrid design of structure optimization and material replacement,this paper proposes a steel-plastic integrated front-end module structure.Through the verification with DMU and CAE analysis,the structure is feasible,the total mass is reduced compared with the original body structure of stamping parts,meantime the static and dynamic characteristics are also improved to varying degrees.
Aiming at the cracking phenomenon of the junction box cover plate on a bus direct drive perma-nent magnet synchronous motor in the vibrating bench test,the random vibration simulation analysis and structural optimization design are carried out.By the verification with simulation and test,the new structure of the cover plate meets the strength requirements.
Hydrogen safety has always been a key problem in the safety of hydrogen fuel cell vehicles.This paper designs the hydrogen safety plans based on different aspects,including vehicle control,electrical,and structure to improve the overall safety of hydrogen fuel cell vehicles.
Z-direction height is a difficult problem often occurring in the production process of body-in-white vehicle.This paper uses the fishbone diagram to analyze the Z-direction height problem of front part of the rear under vehicle body,identifies the key influencing factors from the aspects of personnel,ma-chines,materials,methods and environment,and proposes rectification measures to improve product quality and reduce the rework probability.
The authors analyze the operational characteristics of pure electric buses in scenic road condi-tions,design the testing methods for vehicle power performance,braking capacity,and economic perform-ance suitable for scenic mountainous road conditions,and conduct the vehicle testing verification.
Aiming at the bench test scenario where multiple small diameter high-voltage harnesses passing through Hall sensors in parallel,the total current detection accuracy may deviate due to the mutual interfer-ence between high-voltage wires and the influence of shielding layers.The high-voltage junction box with integrated Hall current loop can effectively ensure the current detection accuracy,which takes into account the heat dissipation advantage of using multiple high-voltage lines simultaneously and meanwhile avoids the cost increase caused by the use of new large cross-section high-voltage lines.
Aiming at the problem of poor braking smoothness of electric commercial vehicles after ABS acti-vation on low adhesion roads,this paper designs a braking performance control system based on slip ratio and ABS.The system reduces the probability of ABS activation by adjusting the braking torque before ABS activation.After ABS activation,the braking smoothness is improved by controlling the electric braking can-cellation ratio and coupling the normal state electric braking MAP.
This paper analyzes and optimizes the interior noise caused by the mode of electric drive axle of an extended range vehicle by the combination method of test and simulation.By increasing the mode fre-quency of the electric drive axle to avoid the vehicle sensitive frequency,which the purpose of improving the interior noise is achieved.
NVH simulation analysis can predict the electromagnetic vibration noise characteristics of a motor in the design stage,so as to propose the optimization design scheme of the motor electromagnetic.This pa-per builds the finite element model of a permanent magnet synchronous motor(PMSM),applies reasonable material properties and constraints to perform NVH simulation analysis,and verifies the accuracy of the sim-ulation through the prototype testing.
基于TTC算法设计加速踏板防误踩系统的风险评估模型.为提高防误踩控制系统识别的准确率,引入头部转动角度信号以及车速标准差作为换道超车意图的非误踩表征.最后,基于MAT-LAB/Simulink设计误踩加速踏板时的制动策略,并进行仿真分析.
为提高燃料电池客车经济性,本文分别开发一种基于自适应功率跟随的多挡位滞环控制技术和一种自适应功率预测的动力电池SOC高位均衡技术的燃料电池整车电-电混合能量管理控制策略.将该控制策略应用于中通12 m燃料电池旅游客车,其百公里氢耗最低可至5.2 kg,节能效果明显.
通过OTPA方法识别某车辆在高速行驶时车内出现嗡嗡噪声,结果显示主要贡献来自 4 个转向节.其异常振动来自特定车速下轮毂轴承阶次振动与轮胎声腔振动耦合,通过优化轮辋结构加强轮辋侧向刚度并实车验证,车内嗡嗡声问题得到明显改善.
提出一种纯电动客车定速巡航控制方法.基于MATLAB优化整车控制模型,整车控制器通过采集电机转速信号、踏板信号和定速巡航按钮信号来控制车辆行驶模式和电机请求扭矩值,以实现纯电动客车的定速巡航控制.
