Benzine and derv photograph are compared, petrolic boiling point is low, easy aerification, and the spontaneous combustion temperature of derv is low.
Diesel engine is used compress airy method to raise air temperature, the spontaneous combustion that makes air temperature exceeds derv checks, at this moment again gush enters sparge of derv, derv and air compound at the same time him ignition burns. Er of German surname a place of strategic importance thought up this method to obtain patent, so diesel engine calls Di Sai Er engine again.
Compare with gasoline engine photograph, the advantage of diesel engine is petty gain of case of bavin oil price, economy is good, and it does not have ignition system, trouble is so less.
But diesel engine because actuating pressure is great, the requirement has higher structural intensity and stiffness about the spare parts each, diesel engine is so more cumbersome, volume is larger; Demand of production precision of the gush oil pump of diesel engine and nozzle is high, cost is so higher; Additional, diesel engine work is tough, oscillatory noise is big; Derv evaporates not easily, difficulty starts when winter cold car.
So, gasoline engine basically equips in present car.