Because diesel engine combustion and exhaust emissions are different from gasoline engines, many new technical terms appear in the introduction of diesel vehicles and diesel vehicles are named for such as Jetta SDI and Bora 1.9TDI. SDI means naturally aspirated direct injection diesel engine, the use of Germany's Bosch (BOSCH) company's electronic control fuel distribution pump. For example, FAW-Volkswagen Jetta 1.9GDF uses a 1.9-liter SDI engine with a compression ratio of 19.00, exhaust emission meets Euro III standards, and a fuel economy of 4.6 km / km at a speed of 90 km. Users actually use less than 5.5L of fuel / 100km. TDI means turbocharged direct injection, more than a turbocharger SDI, Bosch pump nozzle for fuel supply technology, injection pressure up to 1870bar. Such as FAW - Volkswagen launched Polaris 1.9TDI engine, the compression ratio of 19.00, the turbocharger with adjustable vane, at any speed can produce the required inflation pressure, the performance greatly improved than the traditional turbocharger. Exhaust emissions meet the European III standards, 90 kilometers of constant fuel consumption 5.5L / 100km, the actual fuel consumption of users is less than 6.3L / 100km. Pump nozzle injection technology to increase injection pressure, diesel and air mixture more fully burn more thoroughly, while the use of oxidation-type catalytic reactor, greatly reducing the carbon oxide and nitrogen oxide emissions. However, the pressure of diesel oil in the high-pressure tubing fluctuates with the speed of the vehicle, which can easily lead to the vibration of the engine and cause more noise. High-pressure common rail injection system is based on direct injection technology, pre-injection technology and electronic control technology based on a new injection system. It can spray pressure and injection process completely separate from each other, through the common rail to achieve precise control of the oil pressure, high pressure pipe pressure and the engine speed has nothing to do. Therefore, high-pressure common rail injection system through the optimization of fuel injection control diesel engine to make it more fully burned, harmful emissions, noise and cold start performance have been greatly improved. However, common rail fuel injection pressure is lower than the pump nozzle system, generally only reached about 1600bar. Because diesel engine combustion and exhaust emissions are different from gasoline engines, many new technical terms appear in the introduction of diesel vehicles and diesel vehicles are named for such as Jetta SDI and Bora 1.9TDI. SDI means naturally aspirated direct injection diesel engine, the use of Germany's Bosch (BOSCH) company's electronic control fuel distribution pump. For example, FAW-Volkswagen Jetta 1.9GDF uses a 1.9-liter SDI engine with a compression ratio of 19.00, exhaust emission meets Euro III standards, and a fuel economy of 4.6 km / km at a speed of 90 km. Users actually use less than 5.5L of fuel / 100km. TDI means turbocharged direct injection, more than a turbocharger SDI, Bosch pump nozzle for fuel supply technology, injection pressure up to 1870bar. Such as FAW - Volkswagen launched Polaris 1.9TDI engine, the compression ratio of 19.00, the turbocharger with adjustable vane, at any speed can produce the required inflation pressure, the performance greatly improved than the traditional turbocharger. Exhaust emissions meet the European III standards, 90 kilometers of constant fuel consumption 5.5L / 100km, the actual fuel consumption of users is less than 6.3L / 100km. Pump nozzle injection technology to increase injection pressure, diesel and air mixture more fully burn more thoroughly, while the use of oxidation-type catalytic reactor, greatly reducing the carbon oxide and nitrogen oxide emissions. However, the pressure of diesel oil in the high-pressure tubing fluctuates with the speed of the vehicle, which can easily lead to the vibration of the engine and cause more noise. High-pressure common rail injection system is based on direct injection technology, pre-injection technology and electronic control technology based on a new injection system. It can spray pressure and injection process completely separate from each other, through the common rail to achieve precise control of the oil pressure, high pressure pipe pressure and the engine speed has nothing to do. Therefore, high-pressure common rail injection system through the optimization of fuel injection control diesel engine to make it more fully burned, harmful emissions, noise and cold start performance have been greatly improved. However, common rail fuel injection pressure is lower than the pump nozzle system, generally only reached about 1600bar.