China's auto parts industry is highly fragmented, with a single individual having less funds and weak competitiveness, and it cannot form a strong competitive advantage on its own. At present, China's auto parts industry is still at a relatively low level, with repeated decentralization, low concentration, and single matching. Most of the auto parts companies only provide support for one automaker. They cannot produce scale production and cannot effectively reduce corporate costs. At the same time, the structure of auto parts products is irrational, and there are too few high-tech products and high value-added products, which are mainly concentrated in labor-intensive, low-value-added products. The scale is small, the types of products are large, and the level of specialization is low. Low production efficiency.

At 20°C to 40°C, the NOx mass fraction shows an upward trend, which is due to the reduction of the proportion of premixed combustion in the early stage of combustion, and the highest burst pressure occurs earlier. Intake air temperature from 40 °C to 50 °C, NOx mass fraction showed a downward trend, this is because the combustion reaction time is shortened and the maximum explosion pressure is reduced, and the combustion avoids TDC. More combustion is concentrated in the piston down phase to complete the reason .

In summary, lowering the intake air temperature can effectively reduce soot and NOx emissions. The effects of different intake air temperatures on the combustion of high-density diesel engines were investigated under the condition of 2.6 MPa inlet pressure and 0.3 EGR rate. It was concluded that the combustion mode of high-density diesel engines with low-emission and high thermal efficiency is relatively large. potential. In China's auto parts industry, due to the low market access standards, more and more manufacturers are entering, which in turn leads to a reduction in the distance between price and cost. The specialization of technical equipment and the specialization of the labor force organization promote the improvement of the efficiency of various enterprises within the industrial cluster.

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