Sequential multipoint fuel injection.
In fact, it is the engine, that is, the sequential multi-point fuel injection city engine, which is the patent of Volkswagen engine in Germany. This engine is mainly suitable for flat road conditions in cities.
The characteristics are as follows: it has the characteristics of maturity, high efficiency, low speed and high torsion, environmental protection and fuel saving, and the power output of urban road conditions is good.
Mature technology: it is a mature engine technology introduced by Volkswagen for many years and has been popularized.
Low speed and high torque: this is the biggest feature of this engine. The variable cross-sectional area technology of intake pipe is to adjust the length of intake distance with the change of load, so as to improve the torque in low-speed area and maintain high power in high-speed area.
Motivation: the motivation is average, but it is very suitable for urban road conditions, especially for working-class people who drive to and from work.
Economic and environmental protection: even if the power is halved, the fuel consumption of urban road conditions is relatively low, and the fuel consumption per 100 kilometers is only 6.5L (at a constant speed of 90km). The leading technology comes from the E-GAS technology adopted by SMFi engine. Compared with the traditional mechanical throttle, the E-GAS electronic throttle can coordinate and manage the torque demand of all parties in the automobile, make the engine reach the design emission, ensure the fuel consumption and optimize its performance at each working point.
Chery A3
VVT (Variable Valve Timing Technology) Engine Variable Valve Timing Technology (VVT for short) is also one of the popular engine technologies at present. In recent years, it is more and more used in modern cars, distributing intake and exhaust by controlling valves. The valve is driven by the crankshaft of the engine through the camshaft, and the valve timing depends on the rotation angle of the camshaft. In ordinary engines, the opening and closing time of intake valve and exhaust valve is fixed, so it is difficult to meet the working requirements of different engine speeds, and VVT can solve this contradiction. Simply put, changing the opening and closing time of intake valve or exhaust valve can improve the intake charge, increase the charge coefficient and further improve the torque and power of the engine.
DVVT engine is the continuation and development of VVT, which solves the technical problems that VVT engine can't overcome. DVVT is the dual variable valve timing of intake and exhaust, which can be said to be the most advanced form of valve variable timing system technology at present.
DVVT engine adopts the principle similar to VVT engine, and uses a relatively simple hydraulic cam system to realize its function. The difference is that VVT engine can only adjust the intake valve, while DVVT engine can adjust the intake valve and exhaust valve at the same time, which has the excellent characteristics of low speed, high torque, high speed and high power, and is in a leading position in technology. Generally speaking, just like human breathing, we can control "breathing" and "inhaling" rhythmically as needed, and of course it has higher performance than just controlling "inhaling". It is precisely because of this leading position in technology that the parameters of the model equipped with DVVT engine are the largest in its class.
The above is taken from Baidu Encyclopedia.
Personally, I feel that these two engine technologies are neck and neck. If you like popular brands and trust popular quality, choose high 6. If you believe that domestic independent brands support domestic cars, choose A3.