The integration efficiency and energy density of power batteries are the key factors affecting the improvement of the driving range of electric vehicles. Selecting the appropriate power battery integration technology can not only improve the integration efficiency and energy density of the battery system, but also help reduce the costs of the entire vehicle. Focusing on the development trends of power battery system, this paper summarizes 3 key integration technologies of power battery systems: typical integration, module-free integration, and one piece integration. Elaboration is conducted from the technical realization, advantages and disadvantages, application trends. The conclusion and prospect from elaboration show that the power battery system is accelerating towards the trend of less components and more integration. The breakthrough of power battery system integration technologies will bring the vehicle better power, economy, higher driving range and better user driving experience.

In order to improve the sound quality of vehicle, a new sound system suitable for passenger car is proposed. Based on the finite element analysis theory, the car door panel model is established, and the calculated natural frequency and mode shape of the door panel are utilized as an important input for the improvement of sound system. In order to reduce the influences of mode on sound level, the measures to improve the mode resonance frequency are put forward. Based on the expected level of cockpit space and psychological perception, a 23-speaker system improvement scheme is developed. Finally, the target car prototype after modification is evaluated through subjective evaluation and objective test. Through the comparison of competing cars, the results verify that the above method can significantly improve the sound level of passenger cars, and provide a reference for the improvement of passenger car audio system.

The in-vehicle voice assistant is the first-level entrance for human-computer interaction in the vehicle. The business processing and interaction capabilities of the voice system in comprehensive scenarios greatly affect the user experience. This article elaborates a set of comprehensive evaluation models, which can fully analyze the function points of the vehicle voice system, derive the implementation logic of competing products, and stage evaluations in production. This model includes a set of evaluation use case databases that support the calculation of 103 quantitative indicators, 15 generate non-quantitative indicators and 3 comprehensive indicators. In addition, this model includes full-process indicator analysis tools and other automation tools. In the actual production and application process, the error rate of this model compared with manual evaluation is about 10%, and the automation efficiency is increased by about 70%.

For electrified vehicles (combustion engine, hybrid and pure electric vehicles), transmission efficiency improvement is the main technology route, which is significant to reduce energy consumption of the vehicle. Efficiency improvement strategies are used to reduce the losses in transmission system. This paper takes the high efficiency automatic transmission of FAW Group as an example to explain the source of efficiency loss and the corresponding efficiency improvement technology. First, a brief background of electrified automation is reviewed. Then, key sources of the transmission efficiency loss are discussed. Finally, some key technologies and research trends of high efficiency transmission are given.

Under the circumstances that the price of raw materials and production support materials is still high nowadays, the material quota-cost method is an effective cost management method that can be adopted by passenger car and component companies. This paper mainly starts from the welding and assembly process management of production support materials for passenger car body, outlines the basic principles of the material quota method, the management procedures for production support materials, the formulation of quota specifications and management contradictions, and proposes the reproducible and implementable measures and recommendations by the application of the quota-cost method for production support materials used in welding production lines in order to improve the implementation efficiency and economic benefits in the quota management of production support materials for body in white.

This paper has built a comprehensive evaluation model of intelligent vehicle following function based on thorough analysis and research. Time To Collision (TTC), Time To Headway (THW), the most acceleration (deceleration), speed, the relative distance including longitudinal distance and lateral distance are chosen as evaluation parameters in this model according to test standards and monographs. With the help of Delphi method, the correlation between the evaluation parameters and safety/comfort has been calculated from experts’ advice. Then a comprehensive evaluation index system of intelligent vehicle following function has been set up based on AHP, so as to construct a multi-dimensional evaluation model. This model combines objective safety with subjective experience, which can provide evaluation basis for the comprehensive evaluation of intelligent vehicle following function.

With the demand of consumers for buying the second cars, the requirements for the functionality and comfort of cars have increased, especially for the riding comfort of the seat. The traditional car seat system design does not fully consider the user’s rest situation, resulting in poor riding experience in the later stage. Through the analysis of traditional seat layout design in the early stage, the human-machine layout requirements of zero gravity seats are formulated, and the optimization design parameters of zero gravity seat layout are checked, design and development methodologies are effectively summarized. By optimizing the human-machine parameters of zero gravity seats, more use scenarios of seats are added to protect the health of drivers and passengers, zero gravity seats are successfully applied in the market.

At present, the engines of hydrogen Fuel Cell Vehicles (FCV) can basically achieve the cold start at -30 ℃, and the energy consumption to start FCV at low temperature is lower than that of battery Electric Vehicles (EV). In order to realize the quick start of FCV with low energy consumption, the theory of cold start technologies and a large number of experiments and optimization schemes are summarized This paper conducts research from the aspects of component design and layout, pipeline design, start-up and shot down strategy, purge strategy, cold start fault diagnosis strategy and auxiliary heating, and forms a series of software and hardware solutions conducive to cold start, which are verified by test benches and vehicle tests. Based on engineering applications, this study improves the robustness and the success rate of low temperature cold start of fuel cell engines, and reduces the risk and damage of cold start failure to the system, through structural optimization, strategy development and fault diagnosis and protection mechanism.

Driving experience, safety and health, energy conservation, fuel consumption reduction and increasingly strict automobile safety evaluation indicators put forward higher requirements for product development of Body In White (BIW). Combined with the product development of a high safety (2021 version of C-NCAP 5 stars, 2020 version of C-IASI G evaluation) for SUV, the design and exploration are carried out around the solutions and lightweight technologies for Mobile Progressive Deformable Barrier (MPDB) collision compatibility and 25% offset collision, and an effective solution path is presented. Test results indicate that the solution can meet the requirements of collision compatibility and lightweight.

In order to ensure the output performance, sealing, reliability and service life of the Proton Exchange Membrane Fuel Cell (PEMFC) stack, theoretical calculation and design optimization of the packaging force and packaging structure of the stack are required. By establishing the equivalent stiffness mechanical model and relevant empirical formula of PEMFC stack, the relationships between the contact resistance of Membrane Electrode Assembly (MEA), the porosity of Gas Diffusion Layer (GDL), the sealing and impact resistance of the stack and the packaging force of the stack are studied. For the finite element simulation of the packaging force of the stack, the simulation optimization method based on the equivalent area and equivalent stiffness is studied. Finally, the design method and structure optimization method of the stack packaging structure are elaborated. The results show that based on the equivalent stiffness mechanical model and empirical formula, the theoretical calculation of the packaging force of the stack can be completed in a relatively short time, and the development efficiency is improved. At the same time, the finite element simulation method can be more accurate and intuitive to complete the design and optimization of the packaging force of the stack. Topology optimization and self-compensation calculation method of packaging force are adopted to improve the rationality of packaging structure design.