In response to the difficulty of silicon-based Insulated Gate Bipolar Transistor (IGBT) in meeting the high power density, low conduction loss and high heat dissipation requirements of electric vehicles, this paper reviews the latest research progress on Silicon Carbide-Metal Oxide Semiconductor Field-Effect Transistor (SiC-MOSFET) for automotive applications. By summarizing the characteristics of SiC-MOSFET in the application scenarios of electric vehicle traction inverters, DC/DC power converters and On-Board Chargers (OBC), this paper analyzes the current technical challenges of SiC-MOSFET in terms of cost, reliability as well as heat dissipation, and explores their future development trends in miniaturization, advanced packaging, multi-chip integration and cost.

In order to calculate power loss of switching power supplies of high-performance chip in automotive centralized domain controller, this article analyzes the on and off processes of Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET), theoretically analyzes and derives formulas for the MOSFET losses of Buck type switching power supplies, and focuses on example calculation and simulation verification of the switch losses. The calculation and simulation results tend to be consistent, which can be used as a reference for hardware design engineers when selecting switch power MOSFETs.

In order to enhance performance of visual perception system object detection model in complex environments such as lighting variations, blur, noise, and occlusion, this study investigates the performance variations of object detection models under different complex scenarios using YOLO 11x and data augmentation techniques. The results indicate that various environmental disturbances have distinct impacts in model perfprmance, with Gaussian noise and motion blur having more pronounced impacts, while brightness adjustments and random occlusions are relatively less disruptive.

In order to improve performance of automatic emergency braking (AEB) system, this article firstly analyzes the data from road traffic accidents, and concludes that the collision frequency and accident fatality rate are higher when the electric two-wheeler drives head-on when the motor vehicle turns left, then summarizes this accident scene as a typical application scenario of AEB system. The PreScan-MATLAB-CarSim active safety simulation test model is built using real vehicle parameters and the technical parameters of the sensor, and the type, number of the sensors and cameras needed and reasonable range of emergency braking parameters are determined by simulation. Finally, driving robot and small-sized bearing robot are employed to build an accident test scene, and the AEB parameter matching and simulation parameter verification are completed. The results show that the parameters can satisfy the requirement of development.

To effectively evaluate the fatigue life of in-wheel-motor-driven electric vehicle steering knuckles, virtual iterative analysis of suspension multi-body dynamics modeling and road spectrum signals is conducted based on the measured road load spectrum, form which the input file of steering knuckles load spectrum is obtained. Fatigue life analysis on the steering knuckle is conducted by combining the inertia release results, material S-N curve and Miner linear cumulative damage criterion, and Fatigue tests are conducted on the steering knuckles for verification. Findings from both simulations and experiments indicate that the primary fatigue risk areas are at the interfaces between the steering tie rod and the lower shock absorber connecting rod. The steering knuckle design satisfies the requirement for a fatigue-free lifespan over a diriveing distance of 16×104 km.

For the additional fuel consumption and pollutant emissions caused by heavy-duty vehicle air conditioning, this paper analyzes the effects of turning on or off air conditioning on fuel consumption and pollutant emissions under different temperature conditions. Dynamometer test is performed based on China Heavy-duty commercial vehicle Test Cycle (CHTC). The test results show that the additional fuel consumption of the air conditioning is about 7% under high temperature, 5% higher than that under normal temperature. The larger the weight of a heavy-duty vehicle, the smaller the impact of the air conditioning system on fuel consumption. Turning on the air conditioning can reduce NO_x emission, and NO_x emission under high temperature is lower than that under normal temperature. Turning on the air conditioning will cause an increase of Particle Number (PN) and CO₂ emissions.