Gas Series Engine

Technical Specifications
SDEC's natural gas series engine is a medium and heavy duty engine fuelled by compressed natural gas (CNG) or liquefied natural gas (LNG). It is used for the supporting power of buses, intercity buses and regional transport vehicles, meeting the high performance, low emission and low noise required by the above mentioned vehicles.

Gas Engine SC9DT

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Technical Specification
Power Range: 280-320PS
Model Unit EuroIII 　 EuroIV 　
　 　 SC9DT280Q3 SC9DT320Q3 SC9DT280Q4 SC9DT320Q4
Type 　 6 In-line, 4-Stroke, Water-cooling 　 　 　
Aspiration mm×mm TCI 　 　 　
Bore×Stroke L 114×144 　 　 　
Total Displacement 　 8.8 　 　 　
Rated Power/Rated Speed kW/r/min 206/2200 235/2200 206/2200 235/2200
Mini Fuel Consumption g/Kw.h ≦215 　 　 　
Maximum Torque/Speed N.m/r/min 1120/1300-1400 1250/1300-1400 1120/1300-1400 1250/1300-1400
Noise dB(A) ≦96 　 　 　
Overall Dimension mm Length: 1232 Wide: 715 High: 1056 　 　 　
Weight kg 760 　 　 　

A binary oxidation catalytic converter is used to ensure the emission meets the Euro IV Standard.

SAE J1587 Communication Protocol is used to make the fault diagnosis and vehicle calibration more convenient.

The rotating speed and output power of the engine are automatically regulated. In the case of idle speed, the engine output power is large, making it easier to drive the air-conditioning accessory.

An imported gas device (in mass production with advanced technology and reliable operation) is used to realize single-point injection before the throttle valve, ensuring adequate mixing of fuel and air as well as stable and smooth combustion of each cylinder.

The high-energy ignition module has strong adaptability to changes in battery voltage. The direct ignition method is applied to fully utilize the ignition energy for improving combustion efficiency.

Engine operational parameters collected by electrically controlled unit; pressure and temperature of inlet manifold and natural gas, atmospheric condition, rotating speed, water temperature, etc. accurately control the injection volume of natural gas, and the air-fuel ratio is corrected in close loop based on the measured values from wide-range oxygen sensor.

The basic spare parts are versatile for mass-produced diesel engines, allowing for convenient maintenance.

The inlet pressure is controlled in close loop by the pressurizing exhaust valve. The inlet air is cooled in the process and the combustion temperature and emission is lowered.

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