什么车型有外部EGR？

中文段落：

外部废气再循环（External Exhaust Gas Recirculation，简称EGR）是一种在汽车发动机中广泛应用的环保技术。通过将一部分废气重新引入进气管，与外部新鲜空气混合，再进入气缸进行燃烧，EGR能够降低燃烧温度，从而减少氮氧化物（NOx）的生成。这种技术对于改善汽车尾气排放、降低环境污染具有重要意义。

那么，哪些车型会配备外部EGR系统呢？通常情况下，中大型柴油车以及部分汽油车会采用外部EGR技术。这是因为柴油发动机在高温高压下运行时，容易产生较多的氮氧化物，需要通过EGR技术来减少排放。而部分汽油车，尤其是那些追求高性能的车型，为了提升发动机效率和降低油耗，也会采用EGR技术。

值得注意的是，并非所有车型都适合使用外部EGR。对于一些小型、低功率的发动机，由于废气量较少，采用EGR可能会对发动机性能产生负面影响。因此，在选择车型时，消费者应根据自己的需求和实际使用情况，了解车辆是否配备了外部EGR系统。

英文段落：

External Exhaust Gas Recirculation (EGR) is an extensively used environmental technology in automotive engines. By reintroducing a portion of exhaust gas into the intake manifold, mixing it with fresh air, and then sending it into the cylinders for combustion, EGR can reduce combustion temperatures, thereby decreasing the formation of nitrogen oxides (NOx). This technology is crucial for improving vehicle exhaust emissions and reducing environmental pollution.

So, which vehicles are equipped with an external EGR system? Typically, medium and large diesel vehicles as well as some gasoline vehicles utilize external EGR technology. This is because diesel engines, operating under high temperatures and pressures, tend to produce more nitrogen oxides, which need to be reduced through EGR. On the other hand, some gasoline vehicles, especially those pursuing high performance, also adopt EGR technology to enhance engine efficiency and reduce fuel consumption.

It's worth noting that not all vehicles are suitable for external EGR. For smaller, low-power engines, the use of EGR may have negative impacts on engine performance due to the limited amount of exhaust gas. Therefore, when choosing a vehicle, consumers should consider their needs and actual usage scenarios to understand whether the car is equipped with an external EGR system.