New SI lean burn CNG bus engine

Development program to EU5 EEV emission level

Situation and Objective

• Development programme to meet EU5 EEV emissions level
• Improved driveability compared to earlier CNG bus concepts
• Full electronic engine controls
• Outsourced due to lack of in-house resource

Ricardo Responsibilities

• Concept study and performance simulations
• Combustion system, gas system and boosting system
• Comprehensive engine calibration programme (torque structure based)

Results and Benefits

• Testbed development and calibration completed
• Power and emissions certification achieved
• Ricardo supporting ongoing vehicle integration