Because there is no reason to use gasoline.

汽油机效率低，同样质量的汽油（用汽油机）发的电少于同样质量的柴油（用柴油机）汽油价格高，同样体积的汽油价格高于柴油汽油密度低，同样质量的汽油体积略微大于柴油，这点加重了上面这点。柴油易燃，一般大气压下柴油是220度，汽油是427度。

The efficiency of gasoline engine is low. The power generated by gasoline of the same quality (using gasoline engine) is less than that of diesel of the same quality (using diesel engine). The price of gasoline of the same volume is higher than that of diesel. The density of gasoline is low. The volume of gasoline of the same quality is slightly larger than that of diesel, which aggravates the above point. Diesel fuel is flammable. Under general atmospheric pressure, diesel fuel is 220 degrees and gasoline is 427 degrees.

当然，实际上都是高压下燃烧。柴油是并且柴油机是压燃，导致机器的允许工作范围大，不会爆震，不容易熄火（在高温下柴油机甚至可以烧汽油）汽油点火能量低，易挥发不安全，这导致汽油易爆。此外汽油挥发到空气中不环保。注意，安全跟安全不是燃点决定，单一介质不会爆炸，爆炸的都是混合物。镁材很安全，但是镁粉空气混合物就有危险。镁粉的点燃温度是 600 度，但是点火能不大，是240mJ。而汽油的点火能量更低，，不到1mJ。

Of course, they actually burn under high pressure. Diesel is and the diesel engine is compression ignition, which leads to a large allowable working range of the machine, no detonation and not easy to shut down (the diesel engine can even burn gasoline at high temperature). Gasoline has low ignition energy, volatile and unsafe, which leads to gasoline explosion. In addition, the volatilization of gasoline into the air is not environmentally friendly. Note that safety and safety are not determined by the ignition point. A single medium will not explode. What explodes is a mixture. Magnesium is safe, but magnesium powder air mixture is dangerous. The ignition temperature of magnesium powder is 600 degrees, but the ignition energy is small, which is 240mJ. The ignition energy of gasoline is lower, less than 1MJ.

当然，柴油机有个缺点就是笨重，但是，差别没你说的那么大。只要使用环境能够接受这个重量，只能选择柴油机。车用机器跟工业用机器不同的，尤其是发电机组。

Of course, the diesel engine has a disadvantage that it is bulky, but the difference is not as big as you say. As long as the operating environment can accept this weight, only diesel engine can be selected. Automotive machines are different from industrial machines, especially generator sets.

工业用引擎是几乎一直在额定功率下工作的.什么叫额定功率？对于小车来说，就是快到红线转速，油门踩到底，并且还没风吹散热！！！注意，即便你在高速上超速驾驶飙到两百码，也不是工业用及机器个环境，因为你的散热器是靠撞风冷却的散热的。你给我把水箱（散热器）用纸皮挡住飙高速试试！一下就开锅了。

Industrial engines almost always work at rated power. What is rated power? For the car, it is fast to the red line speed, the accelerator is pressed to the end, and there is no wind to dissipate heat!!! Note that even if you drive to 200 yards at high speed, it is not an industrial and machine environment, because your radiator is cooled by the impact wind. You try to block the water tank (radiator) with paper! It'll boil in a minute.

小车的发动机（汽油机）按照规范是不需要也不允许长时间大功率工作的，当然，大车的发动机（柴油机）按照规范需要能够长时间大功率工作。

The trolley engine (gasoline engine) does not need and is not allowed to work at high power for a long time according to the specification. Of course, the crane engine (diesel engine) needs to be able to work at high power for a long time according to the specification.