Abstract: A system of analyzing engine performance to assist in the improved control of a dual fuel engine includes measuring devices for measuring parameters including engine load, RPM, fuel injected, air inlet temperature, exhaust temperature, oxygen or carbon dioxide levels in the exhaust gases, at discrete time intervals. An electronic storage device stores the data collected by the measuring devices at each of the discrete time intervals, and analysis apparatus analyzes the stored data to establish a data table for each parameter against each measured engine load and RPM point. Imaging software is provided for presenting the data sets for each parameter as a three dimensional surface plotted against load and RPM.

Abstract: A gas substitution system for a dual fuel diesel engine which monitors load and RPM and the operational state of the engine and vehicle including throttle displacement, cruise control, idle, wheel and engine braking, manual control. Data is collected to establish parameters such as fuel consumption and exhaust emissions for load/RPM pair values and using these to create a table of optimum gas substitution values at each load RPM pair within the range of operational states within which substitution is viable. The system is applicable to: constant engine speed stationary applications (gensets); variable engine speed applications, including mobile plant; automative applications with no existing engine management system; automative applications with a basic existing engine management system; automative applications with an advanced existing engine management system.