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A system includes a controller operable to communicate with at least one sensor and an engine. The controller responds to one or more signals received from the sensor and influences engine operation based on determined engine operation threshold limits and information regarding a first fuel and a se

A system includes a controller operable to communicate with at least one sensor and an engine. The controller responds to one or more signals received from the sensor and influences engine operation based on determined engine operation threshold limits and information regarding a first fuel and a second, different fuel. The controller is configured to change or maintain engine operation based on the one or more signals compared to the threshold limits, and to change or maintain an engine fuel supply to control specific fuel consumption of at least one of the first and second fuels and to achieve values for the one or more signals in a determined range relative to the threshold limits. The one or more signals indicate an exhaust emissions parameter or at least one of pre-turbine temperature, fuel injection pressure, turbocharger rotational speed, peak firing pressure, rate of pressure rise, or knock intensity.

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1. A system, comprising: a controller operable to communicate with at least one sensor and with an engine, and thereby to control operation of the engine, wherein the engine is operable with a first fuel and a second fuel, the first fuel and the second fuel not being the same type of fuel;wherein th

1. A system, comprising: a controller operable to communicate with at least one sensor and with an engine, and thereby to control operation of the engine, wherein the engine is operable with a first fuel and a second fuel, the first fuel and the second fuel not being the same type of fuel;wherein the controller is configured to change or maintain the engine operation based on information regarding the first fuel and the second fuel, and further based on one or more signals received from the at least one sensor compared to determined engine operation threshold limits, and the controller is configured to change or maintain an engine fuel supply to control specific fuel consumption of at least one of the first fuel or the second fuel and to achieve values for the one or more signals in a determined range relative to the engine operation threshold limits,wherein the one or more signals indicate at least one of an exhaust emissions parameter or one or more of: a pre-turbine temperature, a fuel injection pressure, a turbocharger rotational speed, a peak firing pressure, a rate of pressure rise, or a knock intensity. 2. The system of claim 1, wherein the controller is operable to change a fuel flow rate to the engine of the first fuel relative to the second fuel, and thereby to change a fuel ratio of the first fuel relative to the second fuel. 3. The system of claim 1, wherein the exhaust emissions parameter is based on at least one exhaust component comprising nitrogen oxide, particulate matter, hydrocarbon, or carbon monoxide. 4. The system of claim 1, wherein the engine operation threshold limits include a pre-turbine temperature threshold limit. 5. The system of claim 1, wherein the engine operation threshold limits include a fuel injection pressure threshold limit. 6. The system of claim 1, wherein the engine operation threshold limits include a turbocharger rotational speed threshold limit. 7. The system of claim 6, wherein the controller is operable to derate the engine, decrease engine speed, or decrease a manifold air pressure in response to a sensed measurement that a turbocharger rotational speed is greater than the turbocharger rotational speed limit. 8. The system of claim 1, wherein the engine operation threshold limits include a peak firing pressure threshold limit. 9. The system of claim 8, wherein the controller is operable to at least one of advance fuel injection timing or decrease engine speed if a peak firing pressure is not greater than the peak firing pressure limit. 10. The system of claim 8, wherein the controller is operable to at least one of retard fuel injection timing or increase engine speed if the peak firing pressure is greater than the peak firing pressure limit. 11. The system of claim 1, wherein the engine operation threshold limits include a rate of pressure rise threshold limit. 12. The system of claim 1, wherein the knock intensity is inferred by a pressure trace or measured by a knock sensor. 13. The system of claim 1, wherein the first fuel comprises diesel fuel and the second fuel comprises natural gas. 14. The system of claim 1, wherein the controller is operable to control for the first fuel, the second fuel, or for both the first and second fuels supplied to the engine at least one of: fuel injection timing, fuel supply pressure, fuel supply temperature, fuel supply rate, or a ratio of the first fuel to the second fuel. 15. The system of claim 1, wherein the controller is operable to control at least one of manifold air pressure or engine speed in response to the one or more signals received from the at least one sensor during combustion of at least one of the first fuel or the second fuel. 16. The system of claim 1, wherein the controller is operable to vary one or more of fuel injection timing, fuel supply pressure, fuel supply temperature, fuel ratio, manifold air pressure, engine speed, or EGR rate. 17. The system of claim 1, wherein the controller is operable to change or maintain the engine operation as the one or more signals are compared to the engine operation threshold limits, and the controller is configured to change or maintain the engine fuel supply to achieve values for the one or more signals received from the at least one sensor in a determined range relative to the engine operation threshold limits and to reduce specific fuel consumption of one or more different fuels of the at least first fuel and second fuel. 18. The system of claim 1, wherein the controller is operable to supply simultaneously to the engine two or more of a plurality of fuels, the plurality of fuels including the first fuel and the second fuel, so that the engine operation is maintained below a peak firing pressure limit and a turbocharger rotational speed limit, and engine operation further is based on one or more of the rate of pressure rise, the knock intensity, the pre-turbine temperature, or a maximum fuel injection pressure to be within determined, corresponding engine operational threshold limits, and thereby to reduce the total specific fuel consumption. 19. The system of claim 1, wherein the one or more signals indicate the knock intensity. 20. The system of claim 19, wherein the controller is operable to vary one or more of fuel injection timing, fuel supply pressure, fuel supply temperature, fuel ratio, manifold air pressure, engine speed, or EGR rate. 21. The system of claim 19, wherein the controller is operable to control for the first fuel, the second fuel, or for both the first and second fuels supplied to the engine at least one of: fuel injection timing, fuel supply pressure, fuel supply temperature, fuel supply rate, or a ratio of the first fuel to the second fuel. 22. A system, comprising: an engine operable with a first fuel and a second fuel, the first fuel and the second fuel not being the same type of fuel;at least one sensor;a controller operable to communicate with the at least one sensor and to control the engine;wherein the controller is configured to change or maintain operation of the engine based on information regarding the first fuel and the second fuel, and further based on one or more signals received from the at least one sensor compared to determined engine operation threshold limits, and the controller is configured to change or maintain an engine fuel supply to control specific fuel consumption of at least one of the first fuel or the second fuel and to achieve values for the one or more signals in a determined range relative to the engine operation threshold limits,wherein the one or more signals indicate at least one of an exhaust emissions parameter or one or more of: a pre-turbine temperature, a fuel injection pressure, a turbocharger rotational speed, a peak firing pressure, a rate of pressure rise, or a knock intensity. 23. A vehicle comprising the system of claim 22, wherein the engine is a diesel engine.