Abstract: A control system for an internal combustion engine, wherein in the control system, an in-cylinder oxygen amount is calculated and a compression end temperature, which is a temperature of the pressurized air-fuel mixture, is calculated according to an intake air temperature. A fuel injection parameter is determined according to the compression end temperature, the in-cylinder oxygen amount, and an engine rotational speed. The fuel injector is controlled based on the determined fuel injection parameter. By determining the fuel injection parameter according to the compression end temperature in addition to the in-cylinder oxygen amount, the combustion state is adjusted when the compression end temperature is low, thereby maintaining a stable combustion state.

Abstract: The invention provides methods of providing fuel to an internal combustion engine, fuel systems for an internal combustion engine and a fuel injector for an internal combustion engine. Ammonia may be heated and pressurized to a selected condition and may used as fuel which is supplemented with hydrogen to assist with ignition, flame propagation, and/or combustion speed.

Abstract: The invention provides methods of providing fuel to an internal combustion engine, fuel systems for an internal combustion engine and a fuel injector for an internal combustion engine. Ammonia may be heated and pressurized to a selected condition and may used as fuel which is supplemented with hydrogen to assist with ignition, flame propagation, and/or combustion speed.

Abstract: A control system for an internal combustion engine, wherein in the control system, an in-cylinder oxygen amount is calculated and a compression end temperature, which is a temperature of the pressurized air-fuel mixture, is calculated according to an intake air temperature. A fuel injection parameter is determined according to the compression end temperature, the in-cylinder oxygen amount, and an engine rotational speed. The fuel injector is controlled based on the determined fuel injection parameter. By determining the fuel injection parameter according to the compression end temperature in addition to the in-cylinder oxygen amount, the combustion state is adjusted when the compression end temperature is low, thereby maintaining a stable combustion state.

Abstract: A system and method for modeling and controlling an internal combustion engine having multiple combustion modes. The in-cylinder condition is controlled by gas handling devices through both a feed forward and feedback path. The latter path includes an “in-cylinder condition estimator” and a non-linear controller. Fueling parameters are controlled by engine speed, desired torque, and input from the in-cylinder condition estimator.

Abstract: A method of identifying target outputs, such as emissions levels, for a dynamic system, such as an engine. The engine is run at numerous combinations of input parameters, such as actual settings. At each combination of input parameters, the system is driven to a “quasi-steady” state, rather than waiting for it to reach a steady state. Response data collected at this quasi-steady state is used as the basis for identifying the target outputs and the associated inputs.

Abstract: A method and system for providing data representing crankshaft position. For each rising edge of the crankshaft signal, a position value and a factor value are stored in a look-up table. Cam and crankshaft signals are used to locate an initial crankshaft position. This initial position value is used as a pointer to the look-up table, and incremented with each rising pulse of the crankshaft signal. Data from the table is used to extrapolate crankshaft position from crankshaft signal values to a desired resolution in degree angle units.