Calibration and control strategies for the CNG bi-fuel vehicle are also discussed in this paper. A computer engine simulation model, which is able to predict engine performance, fuel economy, and exhaust emissions, was used to assist mapping and calibration of spark, fuel, and EGR tables, and control of catalyst temperature. The CNG fuel storage technology of the bi-fuel system was validated to the most stringent safety and durability requirements in the industry. This system has been extensively tested and validated for durability, electro magnetic compatibility requirements, crash integrity, corrosion resistance, emissions performance and powertrain performance under extreme environmental conditions and different CNG fuel compositions. The fuel management system is an automatic switching bi-fuel system which is able to control fuel flow rate, spark timing, EGR, and perform OBD-II (On-Board Diagnostics II) on both gasoline and CNG. The converted bi-fuel vehicles use the same engine with modifications for use with gaseous fuels, and the same catalytic converters as the gasoline baseline. A CNG bi-fuel version of the GMC and Chevrolet C2500 pick up trucks was developed as an OEM (Original Equipment Manufacturer) vehicle.
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