Abstract: Described are methods and systems for powering an Otto-cycle engine using gasoline and compressed natural gas (CNG). The Otto-cycle engine can be powered by determining a quantity of the gasoline and a quantity of the CNG to deliver to a cylinder of the engine during an engine cycle such that combustion within the cylinder occurs at a pre-determined air-fuel ratio; delivering the quantity of the gasoline to the cylinder via a gasoline injector and delivering the quantity of the CNG to the cylinder via a CNG injector such that the gasoline and the CNG combust during the same combustion event; and combusting the gasoline and the CNG within the cylinder. Delivering CNG and gasoline to the cylinder using separate injectors allows the quantities of CNG and gasoline to vary in response to engine operating conditions, which allows the fuel mixture to be adjusted to satisfy engine power and emissions criteria.

Abstract: Described are methods and systems for powering an Otto-cycle engine using gasoline and compressed natural gas (CNG). The Otto-cycle engine can be powered by determining a quantity of the gasoline and a quantity of the CNG to deliver to a cylinder of the engine during an engine cycle such that combustion within the cylinder occurs at a pre-determined air-fuel ratio; delivering the quantity of the gasoline to the cylinder via a gasoline injector and delivering the quantity of the CNG to the cylinder via a CNG injector such that the gasoline and the CNG combust during the same combustion event; and combusting the gasoline and the CNG within the cylinder. Delivering CNG and gasoline to the cylinder using separate injectors allows the quantities of CNG and gasoline to vary in response to engine operating conditions, which allows the fuel mixture to be adjusted to satisfy engine power and emissions criteria.

Abstract: A powertrain controller of a vehicle provides fuel injection pulses based on gasoline operation. The pulse widths of the fuel injection pulses are modified with reference to air temperature, engine speed, and exhaust gas oxygen (EGO) content to control fuel injectors for an alternative fuel such as natural gas. The EGO content, based on alternative fuel operation, is detected and compared to a desired air-fuel ratio or desired fuel trims to provide error information that is used to adjust the modification of the pulse widths. In response to the error information, a neural network (as an example) dynamically adjust the pulse widths of the alternative fuel injection based on the weights of measured, detected engine speed, EGO, universal exhaust gas oxygen, or air temperatures. The engine operating on alternative fuel is provided with the proper mixture of alternative fuel and air to respond to various engine loads and meet emission standards.

Abstract: A powertrain controller of a vehicle provides fuel injection pulses based on gasoline operation. The pulse widths of the fuel injection pulses are modified with reference to air temperature, engine speed, and exhaust gas oxygen (EGO) content to control fuel injectors for an alternative fuel such as natural gas. The EGO content, based on alternative fuel operation, is detected and compared to a desired air-fuel ratio or desired fuel trims to provide error information that is used to adjust the modification of the pulse widths. In response to the error information, a neural network (as an example) dynamically adjust the pulse widths of the alternative fuel injection based on the weights of measured, detected engine speed, EGO, universal exhaust gas oxygen, or air temperatures. The engine operating on alternative fuel is provided with the proper mixture of alternative fuel and air to respond to various engine loads and meet emission standards.