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* Shortcomings of three-cylinder engines With the deep-rooted concept of energy saving and International trade knowledge baseenvironmental protection, three-cylinder engines have attracted much attention for their excellent fuel economy and environmental protection advantages. However, in the process of its continuous wide application, some problems related to its shortcomings have gradually been exposed. This article will introduce the shortcomings of three-cylinder engines, as well as the causes and solutions of these problems. I. Because of its small cylinder diameter and stroke size, the three-cylinder engine has a certain problem of insufficient output power, especially at low speed. Compared with the four-cylinder engine, due to the control of gasoline injection, the torque output of the three-cylinder engine at low speed is smaller, the acceleration is not fast enough, and it is easy to slip, which affects the driving experience and driving safety.Solution: Increase the cylinder diameter and stroke size in the design, increase the displacement and improve the valve opening and valve clearance at low speed, increase the air intake volume, improve the intake efficiency, enhance the low torque output, and improve the acceleration performance by increasing the displacement and improving the cylinder structure and valve system. II. Engine vibration Because the three-cylinder engine needs to complete a cycle in a shorter time than a four-cylinder engine, the rotation speed is faster, which puts forward higher requirements for the overall balance of the engine. Due to the uneven mass distribution of the three-cylinder engine, the jitter and vibration will be stronger, which will affect the stability of the passengers and vehicles in the car. Moreover, the three-cylinder engine is noisy at medium and high speeds, which will reduce the driving experience. Solution: In the process of design and manufacturing, strengthen material selection and matching, and use balance shaft, camshaft balance, double clutch device and other technologies to optimize the durability and balance of the engine.Improve the stability and ride comfort of the vehicle through effective noise reduction processing and the optimized design of the suspension system. III. The unstable three-cylinder engine at startup is prone to obvious shaking and slow response when starting, which increases the risk of driving safety because it is relatively complicated to control gasoline injection. Especially in cold areas, the problem of three-cylinder engines will be more obvious. Solution: Strengthen the management of the engine control system, and provide a more stable and smooth start-up for the vehicle by optimizing the cooperation of software and hardware. IV. The repair and maintenance cost is high. Because the three-cylinder engine adopts relatively new technology, the repair and maintenance cost is relatively high. Because there is often a lack of professional solutions and optimization services for technologies that have just emerged in the market, especially in terms of maintenance and repair. Solution: When purchasing vehicles,We should try to choose brands with experience and strength to ensure proper technical support and services in terms of maintenance. At the same time, vehicle users should also do a good job of maintenance and repair according to the actual situation to reduce the failure rate and basic maintenance costs. In a word, although the three-cylinder engine has the advantages of fuel economy and environmental protection, while creating certain driving experience and driving safety problems, it also requires us to carry out more in-depth consideration and evaluation when selecting and using the vehicle. Through continuous technical optimization and management improvement, it is believed that the future three-cylinder engine will better meet people's travel needs and make greater contributions to environmental protection and development.

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