To address the issue of deviation in the estimation of vehicle mass and road gradient by applying the longitudinal dynamics model when there is a lateral component force in the driving process of vehicles, this paper proposes a coupled mass estimation model based on longitudinal-horizontal dynamics and an algorithm for slope estimation. By analyzing the effect of the acceleration phase on mass estimation, the mass estimation trigger condition is set and the recursive least squares method with forgetting factor is used to estimate the vehicle mass, and the kinematic Kalman filter is fused with the kinematic extended Kalman filter to jointly estimate the road slope. The algorithm is validated by Simulink-CarSim joint simulation and real vehicle test. The results show that the error of the mass estimation algorithm based on longitudinal-transverse dynamics is 0.82%, and the error of the fusion slope estimation algorithm is within 3%, which verifies that the algorithm has good accuracy and real-time performance.

The large number of parameters in deep learning models for driver distraction detection makes it difficult to deploy them on embedded devices. To address this issue, this paper proposes a lightweight distracted driving detection algorithm, YOLOv8n-SGC, based on YOLOv8n. First, a lightweight backbone network, ShuffleNetV2, is constructed, and Ghost convolution is introduced to reduce the number of model parameters and computational cost, achieving model lightweighting. Second, a Convolution and Attention Fusion Module (CAFM) is added after the backbone network to fuse global and local features and improve the algorithm’s detection accuracy. The results show that the improved algorithm model has a reduction in parameters and computational cost compared to the benchmark model, a 28.67% reduction in volume, a 41.79% reduction in inference time, and an mAP increase of 1.1 percentage points.

To establish an effective electromagnetic radiation simulation prediction and design capability during the vehicle design phase, this paper investigates the generation mechanism of electromagnetic radiation from power cables in the motor drive system based on electromagnetic wave radiation theory, and proposes a vehicle finite element model for electromagnetic compatibility simulation. An electromagnetic interference model is built to simulate and predict the electromagnetic radiation emitted by the power cables. The accuracy of the model is validated by comparing the simulation results with actual measurement data. Utilizing this simulation model, the cable layout is optimized, thereby reducing the intensity of interior electromagnetic radiation. The findings indicate that this approach can identify the electromagnetic radiation risks associated with high-voltage cable routing during the design phase, thus avoiding costly modifications in the prototype testing stage. Furthermore, this method contributes to shortening the vehicle design and development cycle while reducing testing costs.

To improve driving stability of bus driver in high-speed turning and obstacle avoidance in high speed driving condition, a vehicle model and an electronic control pneumatic system model is firstly established. Then, based on the super twisting algorithm, an additional yaw moment controller is designed for bus anti-rollover. The disturbance term of the system is estimated through a nonlinear disturbance observer, and it is compensated to the controller. Finally, the co-simulation of MATLAB/Simulink, TruckSim and AMESim is carried out. The simulation results show that compared with PID control, the algorithm proposed in this article can reduce the roll angle by 0.2° and 0.7° respectively under steering wheel step conditions and fishinghook conditions.

In order to discover the effects of automotive Continuous Damping Control (CDC) shock absorber solenoid valve on electromagnetic force, the two-dimensional simulation model of CDC shock absorber solenoid valve is established under ANSYS Maxwell environment, and working air gap, material properties, moving iron core radius and other parameters are simulated and analyzed to obtain the relation curve of electromagnetic force of CDC shock absorber solenoid valve with each parameter. The influence of different structural parameters on electromagnetic force of CDC shock absorber solenoid valve is analyzed. The results show that electromagnet properties and moving iron core radius have a great impact on solenoid force and displacement relation curve. The solenoid valve can be optimized by changing related parameters.

In order to analyze the performance of the shifting system and design the parameters of the shifting system parts, the transmission model of shift execution system has been established, and combined with Trapezoidal Back-EMF and square wave control principle of Brushless Direct Current (BLDC) motor, Simulink control model of motor module is established. ADAMS is used to import physical parameteric model, the interactive simulation of motor model and mechanical system is realized through ADAMS interface. Drum fixed torque loading simulation and motor three-ring control principle are applied to analyze system response characteristic and process parameters of the dynamic shifting process. Simulation and test results show that motor torque loading process impacts remarkably system function realization, parts shifting forces and shifting duration. Selecting appropriate parameters of control system and strategy could realize shift process control.

The phase angle lead characteristic and the amplitude attenuation characteristic of the lag network can be used to improve the performance of the lead and lag corrector system. Therefore, for the stability of Electric Power Steering (EPS) system, an optimization scheme based on lead and lag corrector is proposed. Firstly, the state space equation of EPS system is established based on the steering system dynamics theory and the system transfer function is obtained. Secondly, the open loop transfer function is derived based on the system transfer function, and the influence of the lead and lag corrector on the stability of EPS system is analyzed by simulation. Finally, forward development and design are deployed for lead and lag parameters development. The results show that the amplitude margin, phase Angle margin and cutoff frequency of the open loop transfer function after correction are obviously improved compared with that before correction, and the designed lead lag corrector can greatly improve the stability of EPS system.

A three-dimensional simulation model of leaf spring with few piece variable cross-section with crack is established using SolidWorks and ANSYS. The influence laws of crack location, angle, and depth on the stiffness of few leaf spring are explored by analyzing stiffness characteristics of few leaf spring under different crack locations, angles and depths. The results show that the transverse crack has a significant influence on the stiffness of the leaf spring. The closer the crack location is to the 1/3 length of the straight section at the root of the leaf spring, the closer the crack angle is to 90° and the deeper the crack is, the greater the influence is and the smaller the stiffness is. The longitudinal crack has a slight influence on the stiffness of the leaf spring and the variation of the stiffness is small. The stiffness of the leaf spring with crack is slightly bigger than that of the leaf spring without crack in a certain depth range.

Simulation research on automatic transmission shift schedule is carried out based on virtual calibration technology. Firstly, a high-precision engine model, transmission model and physical models of the entire vehicle and its main components are established. The transmission control model is built using known TCU control strategies or directly connected to the TCU controller on the virtual simulation platform. The Hardware-in-the-Loop (HiL) simulation platform is used to conduct TCU calibration related working conditions simulation testing, and the simulation results are compared with experimental data. The research results indicate that this model-based virtual calibration technology can meet the accuracy requirements in the field of shift schedule calibration and can be used to guide vehicle shift schedule calibration, effectively shortening calibration time and improving calibration quality.

In order to optimize the torque fluctuation of the cross-axis universal joint steering system of a certain vehicle model,By extracting the coordinates of key hard points of the steering system in the CATIA three-dimensional digital model of this vehicle model, a simplified simulation model of the steering system is established by using ADAMS/View software.Under the condition of not changing the installation hard points of the steering system, the phase angle of the transmission shaft that can minimize the torque fluctuation of the steering system is obtained through simulation.The results of subjective evaluation and real vehicle verification show that the optimization result of simulation data is consistent with the theoretical calculation result, ensuring the minimum torque fluctuation of the steering system.