Diesel Engines and Gasoline Engines

Features of Diesel Engines
Fuel: Diesel light oil
Fuel supply system: High-pressure direct injection into cylinder via fuel pump
Air-fuel mixing: Non-uniform mixing
Ignition system: Compression-induced spontaneous combustion
Compression ratio: 15.5-23
Output control system: Controlled exclusively by fuel injection amount (fixed intake air amount, mixing ratio control)

Combustion
Diesel Engines

In diesel engines, air is drawn into the cylinder and highly compressed, after which fuel is sprayed into the cylinder under high pressure. Ignition occurs spontaneously as a result of the high temperature generated through compression.
Thermal Efficiency
Ratio of heat converted into power against total heat generated during combustion
Diesel Engines Feature High Thermal Efficiency
Thermal Efficiency Ratio=Ratio of heat converted into motive power: 35-42%

CO2 Diesel engines' high thermal efficiency translates into low fuel consumption.
20-40% lower than gasoline engines
Durability
Working life of 300,000 - 1,000,000 km or more
(from car-mounted engine data)
Performance Diesel engines generate flat torque from the low speed range, so diesel vehicles are easy to drive.
Based on in-house data


Features of Gasoline Engines
Fuel: Gasoline
Fuel supply system: Carburetor or low-pressure intake-pipe fuel injection system
Air-fuel mixing: Pre-injection uniform mixing
Ignition system: Spark ignition
Compression ratio: 8-10.5
Output control system: Suction mixture air amount control via throttle valve (fixed mixing ratio)

Combustion

In gasoline engines, air and fuel are mixed in advance and then drawn into the cylinder and compressed. The compressed mixture is ignited by an ignition plug.
Thermal Efficiency
Ratio of heat converted into power against total heat generated during combustion
Thermal Efficiency Ratio=Ratio of heat converted into motive power: 25-30%

CO2 Since gasoline engines have a lower thermal efficiency than diesel engines, their CO2 exhaust amount is correspondingly greater.
Durability Working life of 100,000 - 300,000 km or more
(from car-mounted engine data)
Performance Gasoline engines generate torque during high-speed rotation.
Based on in-house data