Full Width Deformable Barrier (FWDB) finite element model is established according to the standard of EEVC-WG15, calibrated using the Transport Research Laboratory (TRL) trolley experiment method, and the Moving Progressive Deformable Barrier (MPDB) finite element model that has been calibrated and verified is used to build the MPDB and FWDB crash models of cars and SUVs respectively for the frontal collision compatibility study of vehicles. Compatibility evaluation indexes of MPDB and FWDB models are calculated, the analysis results show that the current MPDB conditions have some limitations on the evaluation of structural compatibility of vehicles, and cannot evaluate the role of the primary energy absorbing structure in the vertical and horizontal directions, and need to be combined with the compatibility evaluation indexes of FWDB conditions, VSI and HSI, to conduct an analysis in order to evaluate the frontal collision compatibility of the vehicle in a more comprehensive way.

A study was conducted on the collision safety of passengers with “zero gravity” seats at different deployment angles. Firstly, a frontal collision model of the vehicle is established, and the seat angles were adjusted to standard posture, zero gravity sitting posture, and the backrest angle was adjusted to three different postures of 120°, 150°, and 180° based on the standard posture. Then, two collision speed curves of 40 km/h and 56 km/h were applied to the model, respectively. Simulation comparison shows that the injury values of the occupant's head, neck, and chest are the smallest in the standard posture. The injury values of the occupant's head and neck are the largest in the zero-gravity posture. The risk of chest injury increases with the increase of posture angle. The chest undergoes compression deformation, and the lungs are most susceptible to contusion, followed by the liver and spleen. The increase in the inclination angle of the passengers increases the risk of severe diving and “secondary collision” of the lower limbs.

To weaken the vibration and noise of automotive synchronous motors, this paper proposes a combined rotor slotting design scheme and electromagnetic noise forward optimization design method. Firstly, the mechanism of electromagnetic vibration noise is explored, then based on Maxwell tensor method and finite element method, the time-space distribution characteristics of radial electromagnetic force wave are studied, and the main electromagnetic force harmonic components causing electromagnetic noise are determined. Secondly, an improved design scheme of combined rotor slotting is proposed, and the optimal solution of structural parameters of slotting scheme is determined by combining the optimal prediction meta-model and strength Pareto evolutionary algorithm. Finally, the electromagnetic simulation model of the motor is established, and its line back electromotive force, cogging torque and output torque are compared and evaluated. The results show that the rotor slotting design can effectively suppress the spatial 0-order 12f electromagnetic force harmonic amplitude, improve the back EMF waveform, reduce the cogging torque and torque ripple, and thus reduce the vibration noise. Compared with the original prototype, the harmonic amplitude of the 0-order 12f electromagnetic force is weakened by 81.51%, the torque ripple is reduced by 44.98%.

By summarizing the laws, regulations and standards formulated in China and foreign countries during the development of intelligent and connected vehicles, this paper sorted out the standardization construction system of intelligent and connected vehicles, which included 4 parts: admission, term definition, testing system and accident liability of intelligent and connected vehicles. Through the interpretation of standards, the understanding of the evolution of relevant laws and regulations in the process of the transformation of traditional vehicles to intelligent and connected vehicles was deepened, the technical requirements and social problems faced by the current intelligent and connected vehicle industry were clarified.

In order to improve the active safety of three-axle vehicle under special driving conditions, an all-wheel steering control strategy combining feedforward control and feedback control is proposed. Firstly, considering the nonlinear mechanical properties of tires and the difference of vertical stiffness of each axle, a nine-degree-of-freedom three-axle vehicle dynamics model is established, and the tire cornering stiffness in the reference model is dynamically corrected in real time based on Newton interpolation method. On the basis of this model, a zero-centroid sideslip angle proportional feedforward control based on Ackerman principle is proposed to cooperate with the front wheel steering feedback controller based on Nonsingular Fast Terminal Sliding Mode (NFTSM) and the middle and rear wheel steering feedback controller based on Fuzzy PID to form an all-wheel steering control strategy. Finally, the vehicle is simulated and verified under the condition of fish hook and double lane change. The results show that the designed all-wheel steering control system improves the vehicle's trajectory tracking performance by 34% and lateral stability by 26% over the feedforward control strategy.

To address the challenges in the communication between infrastructure and vehicles in intelligent transportation systems, this paper applies the Intelligent Reflecting Surface (IRS) to the intelligent transportation system based on visible light transmission, and deeply analyzes its channel transmission model and the influence of road infrastructure parameters. By modeling the Non-Line-of-Sight (NLOS) channel between the infrastructure and vehicles,the transmission performance of signals in the NLOS channel is analyzed. The closed-form analytical solutions of the system performance are derived for the bit error rate, downtime probability, and block error rate of the IRS-assisted NLOS communication. The impact of the compound pointing error on the bit error rate, downtime probability, and block error rate of the IRS-assisted NLOS communication system is analyzed. The bit error rate performance under M-ary Phase Shift Key (MPSK) modulation and traditional key control modulation is also analyzed. The experimental results show that under the IRS-assisted NLOS transmission condition, when the link follows the double-Rayleigh distribution or the Rayleigh-Rice combined distribution, increasing the distance between the transceiver devices and the height of the street lamp will increase the bit error rate. Increasing the downtime threshold can increase the downtime probability. Increasing the number of transmitted bit blocks can improve the block error rate. MPSK modulation can reduce the system bit error rate more rapidly, and the performance is enhanced as the modulation order increases. After considering the pointing error to the system, its bit error rate, downtime probability and block error rate all increase. The proposed scheme can effectively enhance system communication performance.

To investigate the impact of full-touch screen infotainment system response speed on car-following safety, this paper conducts human-machine interaction experiments using real car-following videos in an in-vehicle cockpit simulator. Data are collected from 25 participants under 2 vehicle speeds and 3 response speed conditions during both static and dynamic car-following scenarios. The visual distraction data are analyzed to reveal correlations between system response speed and car-following safety risks. Results demonstrate that as response time increases from 0 to 800 ms, the Total Time Spent on Screen (TTS), Glance-to-Screen Count (GSC), and Single Operation Time (SOT) exhibit nonlinear gradually growth with decelerating rates. Specifically, at 80 km/h, when response time increases from 0 to 400 ms, the TTS, GSC, and SOT increase by 17.83%, 19.74%, and 28.72% respectively, while the smaller increments of 10.97%, 12.89%, and 18.06%. When preceding vehicles braked at a 3 s time headway, the minimum following distance decreases by 14.5 m (80 km/h) and 12.78 m (100 km/h) as response time extends from 0 to 800 ms. Simulation results across 3 time headway levels confirm that slower system response significantly increases both collision probability and severity. These findings provide theoretical foundations for designing safer full-touch HMI systems, highlighting the critical role of optimizing response speed in mitigating driving risks.

Based on the vehicle-vehicle oblique collision accident scenario caused by cooperative obstacle avoidance, this paper analyzes the displacement response and occupant injury. 2 variables are selected, namely the barrier residual vehicle speed and the collision overlap rate: 4 types of barrier vehicle speeds and 3 types of collision overlap rates are set respectively. The displacement phenomenon of occupants caused by cooperative obstacle avoidance and occupants injuries during the collision process are analyzed; the active pre-tensioning seat belt is matched and its restraint effect on the displaced occupants is analyzed. The results show that cooperative obstacle avoidance can cause obvious lateral displacement of the occupants, reducing the protective effect of the basic restraint system, especially for right-leaning seated occupants, the seat belt has completely detached from the occupants' shoulders. From the analysis results of the test matrix, the occupant will suffer the highest comprehensive damage when the collision overlap rate is about 30%. The restraint system equipped with active seat belt has good restraint effect on the displacement movement of the occupants during the cooperative obstacle avoidance process. The lateral displacement of the occupants is significantly reduced, and the comprehensive injury risk of the occupants decreases, whereas there is still a high risk of injury to the occupants' heads in the collision condition with a 50% overlap rate.

To address the issue of front brake low-frequency squeal of passenger car, a mathematical model and multi-condition matrix of stability analysis of braking system were established, and stability of the braking system was analyzed with complex mode simulation. The results show that the unstable mode appears in the system under 1 830 Hz, which is in good agreement with the vehicle brake squeal test results. Components and their modal contribution analysis method were used to analyze the unstable mode. The results show that the first torsional mode of the caliper and the first bending mode of the pad are the biggest contributors to the unstable mode. The brake caliper and pad were optimized. The results show that the 1 830 Hz unstable mode becomes stable after the caliper structure is strengthened, the system stability is improved after the pad material and structure adjustment, whereas it is still in the unstable interval, and the squeal is difficult to remove, which is consistent with the experimental results, and the subjective evaluation result is acceptable.

Aiming at the issues of low high-speed tracking accuracy and weak robustness in the trajectory tracking control of distributed electric drive bearing platforms, a hierarchical lateral motion control strategy based on desired front wheel angle tracking is designed. Taking the distributed electric drive bearing platform as the research object, a comprehensive dynamic model integrating rubber wheels, vehicle body, and electric drive modules is constructed based on the dynamic analysis of each subsystem and the interaction relationship between the wheels and the ground. By constructing a hierarchical motion control strategy with upper-level Model Predictive Control (MPC) trajectory tracking and lower-level steering motor angle control, high-precision control of the platform’s lateral position can be achieved. A holistic dynamic simulation model of the bearing platform is built using Simulink. The simulation results show that the lateral motion control strategy designed in this research can achieve multi-scenario trajectory tracking with high precision at various speeds. Compared with the sliding mode controller, the control accuracy of this strategy is improved by 33%, and the control stability is significantly enhanced.