Abstract: A method of evaluating operability of a gaseous fuel admission valve of an internal combustion engine is disclosed. The method includes operating the internal combustion engine on gaseous fuel by repeatedly actuating the gaseous fuel admission valve. The method further includes measuring a sequence of temporal developments of an electrical operation parameter respectively associated with an actuation of the gaseous fuel admission valve. The sequence includes a first temporal development to be evaluated and a plurality of temporal developments preceding the first temporal development. The method also includes evaluating operability of the gaseous fuel admission valve based on the first temporal development of the measured sequence and at least one of the plurality of preceding temporal developments of the measured sequence.

Abstract: A method of detecting an incomplete combustion, such as a misfire, in an internal combustion engine operating at least partly on a gaseous fuel, includes: receiving pressure data corresponding to a temporal development of a cylinder pressure during a combustion event within a combustion cycle; deriving from the pressure data a combustion energy value of the combustion; determining that the derived combustion energy value is beyond a predetermined combustion-cycle specific combustion threshold level; and associating the combustion event with an incomplete combustion in the combustion cycle.

Abstract: A method for controlling fuel flow in a multi fuel engine during transient events is disclosed. A specified fuel substitution ratio may be used for apportioning multiple fuels available for providing power to the multi fuel engine to provide input power for operating the engine at a desired engine speed. When a transient event occurs, such as a significant change in the desired engine speed or the load on the engine, a transient event fuel substitution ratio may used instead of the specified fuel substitution ratio to achieve a desired engine response to the event. The transient event may be detected based on, for example, the change in input power or engine speed caused by the event. The transient event fuel substitution ratio may be specified, or may be calculated based on a knock limit air fuel ratio or other factors.

Abstract: A method for controlling fuel flow to apportion a plurality of available fuels in a multi fuel engine is disclosed. An input power for operating the multi fuel engine at a desired engine speed is determined at a PI controller, and a fuel flow rate for each of a plurality of available fuels is determined at a fuel apportionment module based on the required input power and a specified fuel substitution ratio for apportioning the plurality of fuels to the multi fuel engine. Fuel flow commands for each of the plurality of fuels are output to corresponding actuators of fluid flow control devices for the fuels to cause the cause the fluid flow control devices to provide the corresponding fuels to the multi fuel engine at the corresponding fuel flow rate.

Abstract: A method for controlling emissions in an engine system including an internal combustion engine and a catalytic converter with oxygen storage capacity. The method includes determining a real time oxygen storage level of the three-way catalytic converter based on a real time exhaust gas flow rate and a real time measured upstream oxygen quantity with respect to the catalytic converter. Further, maintaining an optimal oxygen storage level of the three-way catalytic converter for different types of fuel used in the internal combustion engine.

Abstract: A fuel injection timing management system for a dual fuel engine is configured to determine a first diesel injection timing corresponding to a first mode of operation of the engine system and a second diesel injection timing corresponding to a second mode of operation. Further, determine a direction of change in a mode of operation of the engine system, and selectively perform a change in the diesel injection timing from the first diesel injection timing to the second diesel injection timing at a first rate of transition or a second rate of transition, based on the direction of change in a mode of operation of the engine system.

Abstract: An engine system includes a fuel supply unit configured to supply fuel into a combustion chamber. The engine system includes a fuel supply unit to regulate the supply of fuel into an inlet port via a fuel rail and an air supply unit configured to supply compressed air into the combustion chamber. A control system is configured to receive operating conditions of the engine system. Further, the control system includes a detector component configured to generate a control signal indicative of a start-up condition of an engine system. A switching component of the controller receives the control signal indicative of the start-up condition of the engine system from the detector component and further transmits a fuel supply control signal to the fuel valve based on an air-fuel ratio error signal, and transmit an air supply control signal to the choke valve based on an engine speed error signal.

Abstract: A control system for a dual gaseous and liquid fuel engine includes an electronic controller configured to receive data from a plurality of sensing mechanisms indicative of an error in a plurality of different engine operating parameters. The electronic controller is further configured to determine a highest priority one of the errors, and limit substitution of the gaseous fuel responsive to a normalized value thereof.

Abstract: Controlling a gaseous fuel internal combustion engine includes receiving a signal indicative of a desired state of an operating parameter of the engine dependent upon a fueling rate, and tracking the desired state via adjusting a pressure drop from a gaseous fuel common rail to an intake conduit such that the fueling rate is adjusted toward a fueling accordant with the desired state. The control further includes limiting an error in the tracking via executing the adjustment of the pressure drop responsive to a fluid pressure disturbance within the intake conduit.

Abstract: Controlling intake pressure in an internal combustion engine includes calculating a proportional control term based on a difference between actual and desired intake pressure, determining choke and waste gate position values responsive to the proportional control term, and commanding a change in position of the choke or waste gate responsive to the corresponding position value to adjust actual intake pressure toward desired intake pressure. Related apparatus and control logic is also disclosed.

Abstract: A fuel management system for an engine having a common fuel rail. The fuel management system includes means to regulate air supply and fuel supply. A control unit is provided to determine a maximum allowable fuel mass flow supplied from the fuel rail, based on the air supply and a predetermined air-fuel ratio for the operating parameters of the engine. The control unit calculates an allowable upper limit of rail pressure based on the determined maximum allowable fuel mass flow. The control unit regulates the fuel supply based on the determined allowable upper limit of the rail pressure.

Abstract: The present invention overcomes the inadequacies inherent in the known methods for generating libraries of antibody-encoding polynucleotides by specifically designing the libraries with directed sequence and length diversity.