In order to explore the influence of bio-based plasticizers and leather structure on the properties of Polyvinyl Chloride (PVC) leather materials for automobiles, system test and performance test are conducted to find that using suitable eco-friendly bio-based plasticizers for automotive interior PVC leather can meet requirements such as -10 ℃ and 30 000 times folding durability for automotive interior PVC leather materials. PVC leather using environmentally friendly bio-based plasticizers instead of petroleum-based plasticizers has green ecological and skin-friendly comfort properties, and emission of volatile organic compound and aldehyde-ketone substances is significantly lower than that of ordinary PVC leather for automotive interior, which has remarkable low-volatile and environmental protection advantages.

By integrating flexible sensors into automotive seats, steering wheels, and powertrain components, it is possible to monitor the occupants’ physiological indicators (heart rate, respiration) and vehicle health status in real-time. This paper systematically reviews 2 major application scenarios of flexible sensors in intelligent vehicles: environmental perception (e.g., in-cabin gas monitoring) and human-machine interaction (e.g., haptic feedback, intelligent cockpit perception). It further analyzes 3 core technical routes of flexible pressure sensors: nanocomposite-based piezoresistive sensors, porous ionogel-based capacitive sensors, and polymer-based piezoelectric sensors. The study delves into signal transduction mechanisms for each technical route, providing theoretical support for constructing multi-modal perception networks in intelligent vehicles.

Improper handing of the power batteries of New Vnergy vehicle (NEV) throughout the life cycle will cause environment pollution and waste of resources. This paper discusses the current status of environmental protection technology for NEV power battery in terms of current materials selection, recovery systems and policy support. It also explores the development direction of power battery environmental protection technology from 3 aspects of innovation of materials, upgrading of recovery systems and follow-up of support policies.

This paper analyzes and summarizes the impact of China’s natural environment, industrial atmospheric environment and road conditions on the occurrence and acceleration of corrosion in automotive metal materials. The results show that temperature, relative humidity, soil acidity and alkalinity, salt spray in coastal areas, road deicing salt, and industrial atmospheric pollutants are key factors that induce and accelerate the corrosion of vehicle bodies and components. Therefore, in automotive development, rational anti-corrosion design should be made based on these key factors, and corresponding corrosion verification methods should be established to improve the compatibility between the anti-corrosion performance of vehicles and their actual corrosion life, thereby reducing quality issues and cost waste telated to anti-corrosion.

Through the comparative study of different technical routes of aluminum alloy automotive body, this paper proposed the lightweight body solution of “profile frame + cover part” steel-aluminum hybrid heavy truck. Based on the body structure, the material selection, the joining process comparison study and solution formulation were completed, and the CAE software was used to simulate and analyze the modality, stiffness, fatigue and collision performance of the body and all performance indicators meet the product requirements. Compared with the original steel body, the steel and aluminum hybrid heavy duty truck body is 81.5 kg lighter (a decrease of 22.4%), which provides a reference for the subsequent lightweight design and manufacture of heavy duty truck body.

This study systematically investigates the pressure-bearing capacity and failure mechanism of air suspension reservoirs through numerical simulation, burst testing, and theoretical calculation. Based on nonlinear material constitutive relations, numerical simulations reveal that when the cylinder wall thickness increases to 2.3 mm, the maximum equivalent plastic strain reaches 6%, demonstrating sufficient strength to withstand the design pressure of 6 MPa. Burst tests show the actual pressure-bearing of the 2.3 mm thick reservoir reaches 7.29 MPa, with failure consistently occurring at the nozzle-joint area, correlating perfectly with high-stress zones identified in simulations. Fracture surfaces exhibit continuous tearing morphology, confirming typical ductile fracture characteristics. Comparative theoretical calculation indicates the mean diameter formula achieves merely 2.2% deviation from experimental results, significantly outperforming the Faupel formula, thus validating its superiority for burst pressure prediction in thin-walled reservoirs.

Bolt connection is the most commonly used connection technology in automobile industry, its connection failure is a common problem in automobiles, in particular, bolt looseness is the most common problem. Through the research on self-tapping locking bolt, it is found that it has the advantages of high connection reliability, repeated use and low system cost. Through the bolt assembly process development, the difference of torque-clamping force relationship with ordinary bolts was distinguished, the assembly process parameters were determined and reliable bolt connection was realized.

To accumulate experience in the design and manufacturing of lightweight vehicle body connection technologies and enhance the quality of vehicle body mechanical connection processes, this paper summarizes and analyzes lightweight vehicle body mechanical connection technologies such as self-piercing riveting, rivetless connection, hot-melt self-tapping riveting, bolt connection, pull riveting and pressing riveting, and elaborates in detail the process principles, process characteristics, quality control methods and innovative process schemes of each process.

Taking 220 MPa grade ultra-low carbon bake-hardening steels as the research object, this paper compares and aralyzes test steel with Nb single-addition (H220BD-1) and Nb+Ti dual-addition (H220BD-2) systems. Through solid solution carbon calculations and internal friction method determination,the paper explores the influence of solid solution carbon on aging behavior under different composition systems, and combines with microstructure griain size characterization to elucidate the correlation mechanism between grain dimensions and Bake-Hardening (BH) value with aging resistance. Results demonstrate that Ti addition significantly reduces solid solution carbon content, effectively suppressing dynamic carbon segregation during aging. The dual-addition system achieves grain refinement, enhancing strength via Hall-Petch effect while improving aging stability.

This study takes 40 A·h square-shaped ternary lithium-ion battery as the research object to study their gas generation characteristics after thermal runaway, and uses Accelerating Rate Calorimeter (ARC) and thermal runway gas generation performance test equipment dedicated for large capacity lithium-ion batteries to determine parameters like intensity of pressure and temperatures inside the heat & gas generation unit after thermal runway. Gas production process is introduced based on the widely used thermal runaway heat generation model, providing data support for the establishment of battery thermal runway simulation model with composite gas generation characteristics.