Abstract: A control device 100 for an internal combustion engine includes an in-cylinder oxygen concentration acquisition unit configured to acquire an in-cylinder oxygen concentration, an in-cylinder temperature acquisition unit configured to acquire an in-cylinder temperature, a target in-cylinder temperature acquisition unit configured to acquire a target in-cylinder temperature during main injection based on the in-cylinder oxygen concentration acquired by the in-cylinder oxygen concentration acquisition unit, and an in-cylinder oxygen concentration control unit configured to execute in-cylinder oxygen concentration control for controlling an in-cylinder oxygen concentration during pilot injection performed prior to the main injection based on the difference between the target in-cylinder temperature during the main injection acquired by the target in-cylinder temperature acquisition unit and the in-cylinder temperature acquired by the in-cylinder temperature acquisition unit.

Abstract: A cylinder-to-cylinder variation abnormality detecting device including a rotational fluctuation detecting module that detects a rotational fluctuation among cylinders of a multi-cylinder engine; a rotational fluctuation type abnormality determining module that determines whether a cylinder-to-cylinder variation abnormality is occurring, from the rotational fluctuation; an air-fuel ratio detecting module that detects an air-fuel ratio; an air-fuel ratio fluctuation type abnormality determining module that determines whether the abnormality is occurring, from a fluctuation in the air-fuel ratio; a frequency component type abnormality determining module that detects whether the abnormality is occurring, from a particular frequency component corresponding to one engine combustion cycle; and a cylinder-to-cylinder variation abnormality determination finalizing module that finalizes a determination of the abnormality, if the rotational fluctuation type determining module determines the abnormality and the air-fuel

Abstract: A control system for an engine is provided, which includes an accelerator opening acquiring module for acquiring an accelerator opening, a target acceleration setting module for setting a target acceleration of a vehicle based on the acquired accelerator opening, and an engine control module for adjusting an engine torque to achieve the set target acceleration. By utilizing first to third ranges defined for the accelerator opening and first to third acceleration characteristic maps, the target acceleration setting module selects one of the first to third acceleration characteristic maps according to a range under which the acquired accelerator opening falls among the first to third ranges, and the target acceleration setting module sets the target acceleration corresponding to the acquired accelerator opening based on the selected map.

Abstract: The disclosure includes a system, method and tangible memory for providing a vehicular barometric pressure reading. The system includes a plurality of electronic sensor devices configured to record first barometric pressure data describing a first barometric pressure associated with the vehicle. Each of the electronic sensor devices may record a separate barometric pressure reading associated with the vehicle. The system may further include an onboard vehicle computer that is communicatively coupled to the plurality of electronic sensor devices and programmed to (1) analyze the separate barometric pressure readings to determine, for each of the electronic sensor devices, a confidence factor indicating a confidence in the accuracy of the barometric pressure reading for each of the electronic sensor devices and (2) determine whether to provide a sensor service recommendation based on the confidence factor.

Abstract: Methods and systems are provided for fuel systems including a gaseous fuel. Fuel rail over-pressure may be addressed by temporarily closing a fuel tank valve of the gaseous fuel and initiating diagnostics routines to determine if a pressure regulator is degraded. If the pressure regulator is degraded, one or more fuel system components may be adjusted to enable fuel rail pressure control.

Abstract: An internal combustion engine, wherein an exhaust purification catalyst (13) and a hydrocarbon supply valve (15) are arranged in an engine exhaust passage, the internal combustion engine being provided with a low-pressure exhaust gas recirculation device (LPL) for recirculating exhaust gas downstream of the exhaust air purification catalyst (13). When a lock up clutch (66) in a torque converter (27) should engage, non-sliding engagement of the lock up clutch (66) is prohibited in a case where an exhaust gas recirculation action is performed by the low-pressure exhaust gas recirculation device (LPL) and hydrocarbons are sprayed from the hydrocarbon supply valve (15) at predetermined cycles.

Abstract: A method of determining fuel limits for an engine includes measuring an actual fuel value for the engine and creating a plurality of engine speed points. The method further includes calculating respective static fuel limit points for each of the engine speed points utilizing the actual fuel value. The static fuel limit points define and limit a rated power of the engine.

Abstract: In a liquid ejection control device, an operation unit includes an energy dial for inputting an energy instructing value related to kinetic energy of a pulsed liquid jet ejected from a liquid ejection device, and a repetitive frequency dial for inputting a repetitive frequency instructing value related to the number of times ejection of the pulsed liquid occurs per unit time. In addition, a controller includes a voltage magnitude setting section that sets voltage magnitude of the drive voltage waveform such that the kinetic energy becomes the energy instructing value, based on a rising index value related to rising of the drive voltage waveform and the repetitive frequency instructing value.

Abstract: In a liquid ejection control device, an operation unit includes a momentum dial for inputting a momentum instructing value related to momentum of a pulsed liquid jet ejected from a liquid ejection device, and a repetitive frequency dial for inputting a repetitive frequency instructing value related to the number of times ejection of the pulsed liquid occurs per unit time. In addition, a controller includes a rising frequency setting section that sets a rising frequency as a rising index value related to rising of a drive voltage waveform such that the momentum becomes the momentum instructing value, based on voltage magnitude of the drive voltage waveform and the repetitive frequency instructing value.

Abstract: An engine system with advance detection of detonation and/or pre ignition, the system comprising an engine, operative for propulsion of a vehicle by generating rotational motion, whose rotational velocity over time is monitored; and a detonation and/or pre ignition detector operative to provide an alert for impending detonation and/or pre ignition of the engine, if the rotational velocity fluctuates over time to an extent which is predetermined to be unsafe.

Abstract: In a liquid ejection control device, an operation unit includes an energy dial for inputting an energy instructing value related to kinetic energy of a pulsed liquid jet ejected from a liquid ejection device, and a repetitive frequency dial for inputting a repetitive frequency instructing value related to the number of times ejection of the pulsed liquid occurs per unit time. In addition, a controller includes a rising frequency setting section that sets rising frequency as a rising index value related to rising of a drive voltage waveform such that the kinetic energy becomes the energy instructing value, based on voltage magnitude of the drive voltage waveform and the repetitive frequency instructing value.

Abstract: In a liquid ejection control device, an operation unit includes a momentum dial for inputting a momentum instructing value related to momentum of a pulsed liquid jet ejected from a liquid ejection device, and a repetitive frequency dial for inputting a repetitive frequency instructing value related to the number of times ejection of the pulsed liquid occurs per unit time. In addition, a controller includes a voltage magnitude setting section that sets voltage magnitude of the drive voltage waveform such that the momentum becomes the momentum instructing value, based on a rising index value related to rising of the drive voltage waveform and the repetitive frequency instructing value.

Abstract: A method is provided, comprising: during a first condition, opening a fuel tank isolation valve while maintaining a canister purge valve closed; and indicating degradation of the canister purge valve based on an output of a universal exhaust gas oxygen (UEGO) sensor. The UEGO sensor output will indicate whether any fuel vapor vented from the fuel tank reaches intake through the commanded closed canister purge valve. In this way, canister purge valve degradation may be diagnosed in vehicles that do not include a functional fuel tank pressure sensor or canister vent valve.

Abstract: A method for controlling a hybrid vehicle powertrain, where the powertrain includes a motor and an engine, includes providing a first motor torque in response to an engine start request. The first motor torque cranks the engine through a first compression event. The method additionally includes providing a second motor torque in response to the engine being cranked through the first compression event. The second motor torque is less than the first motor torque.

Abstract: Systems and methods for controlling operation of dual fuel internal combustion engines are disclosed. The control techniques provide for override of a dual fuel mode of operation of the engine by selection of a diesel only fuelling mode in response to one or more operating conditions of the internal combustion engine.

Abstract: A system and attendant structural assembly operative to establish a coordinated mixture of gaseous and distillate fuels for an engine including an electronic control unit (ECU) operative to monitor predetermined engine data determinative of engine fuel requirements and structured to regulate ratios of the gaseous and distillate fuel of an operative fuel mixture for the engine. The system and assembly includes at least one mixing assembly comprising an integrated throttle body and air gas mixer directly connected to one another, wherein the throttle body is disposed in fluid communication with a pressurized gaseous fuel supply and the air gas mixer is disposed in fluid communication with a flow of intake air to a combustion section of the engine. In use, the throttle body is structured to direct a variable gaseous fuel flow directly to the air gas mixer for dispensing into the intake air flow to the combustion section.

Abstract: A system includes a command generator module, a compensation module, and a fraction module. The command generator module generates a first command value and one of activates and deactivates intake and exhaust valves of a first cylinder of an engine based on the first command value. The compensation module generates a compensation value for a second cylinder of the engine based on a response of a model to the first command value. The fraction module determines a target value based on a torque request, the target value corresponding to a fraction of a total number of cylinders of the engine to be activated. The command generator module further: generates a second command value based on the compensation value and a difference between the target value and the first command value; and one of activates and deactivates intake and exhaust valves of the second cylinder based on the second command value.

Abstract: An engine system, comprising an externally filled fuel tank with an external fill port; a separator for separation of fuel based on octane level, the separator having a high octane outlet and a low octane outlet; a secondary fuel tank with an amount of fuel located therein and a return line, the secondary fuel tank fluidically coupled to the low octane outlet of the separator and the return line fluidically coupling the externally filled fuel tank to the high octane outlet of the separator or the secondary fuel tank fluidically coupled to the high octane outlet of the separator and the return line fluidically coupling the externally filled fuel tank to the low octane outlet of the separator.

Abstract: Methods and systems are provided for controlling an aspirator shut-off valve in an engine of a hybrid vehicle. One example method includes opening the aspirator shut-off valve following a shut-down command to the engine when engine speed is between a first engine speed and a second engine speed, the first engine speed being lower than an idle speed and the second engine speed occurring before an imminent engine stop. The example method further includes not opening the aspirator shut-off valve between the first engine speed and the second engine speed if an oxygen content of an emission control device is at or near a threshold.

Abstract: A diesel exhaust fluid (DEF) injector assembly is provided for use in an engine exhaust after-treatment system. The DEF injector assembly includes an injector body having a fluid inlet and a fluid outlet that delivers the DEF to an engine exhaust stream. The DEF injector assembly may also include a valve that opens and closes the fluid outlet of the injector body. An exemplary DEF injector assembly further includes an impact structure with an inclined impact surface that disperses and distributes the injected DEF into the engine exhaust stream. Another exemplary DEF injector assembly further includes a shroud that insulates the injector body.

Abstract: A system according to the principles of the present disclosure includes a model predictive control (MPC) module and an actuator module. The MPC module generates predicted parameters based on a model of a subsystem and a set of possible target values. The MPC module generates a cost for the set of possible target values based on the predicted parameters and at least one of weighting values and references values. The MPC module adjusts the at least one of the weighting values and the reference values based on a desired rate of change in an operating condition of the subsystem. The MPC module selects the set of possible target values from multiple sets of possible target values based on the cost. The actuator module adjusts an actuator of the subsystem based on at least one of the target values.

Abstract: Various methods for determining camshaft position based on position indicated by an electric motor controller are provided. In one example, a method comprises: during cranking of an engine, driving a camshaft of the engine by an electric motor controlled by a motor controller which indicates motor position and position of the camshaft; determining one or more engine operating parameters for controlling the engine during the cranking by an engine controller from the indicated cam position; and after the cranking, identifying the cam position from a sensor coupled to the camshaft.

Abstract: A running control device of a vehicle includes an engine with a plurality of cylinders, a clutch connecting/disconnecting a power transmission path between the engine and wheels, a fuel pump transferring fuel toward an injector, and a fuel pressure control device controlling a fuel pressure in a transfer path of the fuel. The running control device of a vehicle performs a neutral inertia running mode performed with the power transmission path between the engine and the wheels disconnected, and a cylinder resting inertia running mode performed by resting at least a part of the cylinders of the engine with the power transmission path between the engine and the wheels connected, the fuel pressure during the neutral inertia running mode being made higher than the fuel pressure during the cylinder resting inertia running mode.

Abstract: Disclosed is a method of injecting natural gas into a diesel fuel engine for combustion with diesel fuel therein. One aspect includes injecting natural gas into an air-stream of an engine air intake or manifold, measuring the percentage of natural gas injected into the airstream or other efficiency gauge, varying the rate of injection of natural gas into the airstream in response to the measured percentage of natural gas therein and injecting the natural gas at a pre-determined rate so as to maintain an natural gas concentration in the air intake stream in the range of 0.6% to 3.0% by volume of natural gas.

Abstract: Vehicle includes an engine, a first rotating electric machine and a control device controlling the rotational speed of the first rotating electric machine such that the rotational speed of the engine matches a target rotational speed. The control device calculates a torque command value of the first rotating electric machine based on an upper limit value of electric power discharged from a power storage device supplying electric power to the first rotating electric machine. The control device calculates the torque command of the first rotating electric machine based on a further restricted value of the upper limit value when a torque restricting condition including simultaneous operation of an accelerator pedal and brake pedal is met.

Abstract: A method for controlling a hybrid vehicle having an engine includes automatically stopping the engine in response to vehicle power demand dropping below currently available electrical power, and automatically starting the engine when vehicle power demand is at a first offset below currently available electrical power to reduce a time delay for starting the engine and increase a currently available vehicle power to move the vehicle up a grade in response to receiving a signal indicating a positive grade. A hybrid vehicle includes an engine, an electric machine, and a controller. The controller is configured to control starting/stopping of the engine in response to a first driver demand when receiving a signal indicative of a road grade angle exceeding a corresponding threshold and in response to a second driver demand otherwise.

Abstract: A catalyst protection device includes: a catalyst provided in an exhaust system of an internal combustion engine; a bed temperature acquisition unit that acquires a bed temperature for each of a plurality of regions of the catalyst distributed in an exhaust gas flow direction; and a fuel injection unit that determines for each of the regions whether an increase in fuel injection amount is required on the basis of the corresponding bed temperature acquired by the bed temperature acquisition unit, that calculates an increase in fuel injection amount for each region and that injects fuel of an amount including the sum of the calculated increase values.

Abstract: When a detected value for detecting a rich imbalance in air-fuel ratio among cylinders, in a state where an intake air amount of an engine falls within a low amount region, is lower than a first threshold corresponding to the intake air amount and is higher than or equal to a second threshold corresponding to the intake air amount, a hybrid electronic control unit controls the engine such that the intake air amount falls within a high amount region, and controls a motor generator such that electric power corresponding to a power increase amount is consumed. When the intake air amount falls within the high amount region, the hybrid electronic control unit detects a rich imbalance in air-fuel ratio among the cylinders by comparing the detected value with a third threshold corresponding to the intake air amount.

Abstract: Methods and devices are described for performing engine diagnostics during skip fire operation of an engine while a vehicle is being driven. Knowledge of the firing sequence is used to determine appropriate times to conduct selected diagnostics and/or to help better interpret sensor inputs or diagnostic results. In one aspect, selected diagnostics are executed when a single cylinder is fired a plurality of times in isolation relative to a sensor used in the diagnosis. In another aspect, selected diagnostics are conducted while the engine is operated using a firing sequence that insures that no cylinders in a first cylinder bank are fired for a plurality of engine cycles while cylinders in a second bank are at least sometimes fired. The described tests can be conducted opportunistically, when conditions are appropriate, or specific firing sequences can be commanded to achieve the desired isolation or skipping of one or more selected cylinders.

Abstract: A control device of a vehicle drive device includes an engine having a supercharger and an automatic transmission outputting power of the engine to drive wheels. When an upshift of the automatic transmission is performed by executing an acceleration operation, if a progress status of a supercharging pressure increase in a supercharger pressure increasing process by the supercharger is a status in an initial period of the increasing process, a supercharging pressure increase degree before start of an inertia phase of the upshift is made smaller than a supercharging pressure increase degree after a predetermined timing subsequent to the start of the inertia phase, while if the progress status of the supercharging pressure increase is a status in an ending period of the increasing process, the supercharging pressure increase degree before the start of the inertia phase is made larger than the supercharging pressure increase degree after the predetermined timing.

Abstract: System and methods for measuring parameters of a battery system using a battery sensing circuit are presented. In certain embodiments, the systems and methods allow a vehicle battery sensing circuit and/or other associated system to measure a compensation parameter. The compensation parameter may be utilized by the battery sensing circuit and/or other associated system in measuring other parameters relating to the battery system including cell voltages.

Abstract: An engine control system for a vehicle includes an air control module and a valve control module. The air control module determines a desired mass of air per cylinder (APC) based on a torque request and selectively increases the desired APC in response to a command to deactivate N cylinders of an engine. The valve control module disables intake and exhaust valves of the N cylinders of the engine in response to the command, determines intake and exhaust valve timing based on the desired APC, and controls camless intake and exhaust valve actuators of M other cylinders based on the intake and exhaust valve timing, respectively. The engine includes Q cylinders, M and N are integers greater than zero, and M plus N equals Q.

Abstract: A control system includes a starter control module, a mode setting module, a fuel pressure control module, and a fuel control module. The starter control module initiates cranking of a spark ignition direct injection (SIDI) engine in response to user actuation of an ignition switch. The mode setting module sets a mode of operation to a cold start mode when an engine coolant temperature is less than a predetermined temperature during the cranking. The fuel pressure control module, in response to the setting of the mode to the cold start mode, determines a target fuel rail pressure. The fuel control module controls fueling during the cranking based on the target fuel rail pressure.

Abstract: A method is provided for creating custom control software for a particular propulsion system configuration. Generic control software is provided that is configurable for use with a plurality of different propulsion system configurations. The generic control software is generically designed to control each of the different propulsion systems regardless of their different propulsion system configurations. The generic control software comprises a plurality of programmable arrays (or configuration tables). Information that characterizes a particular propulsion system configuration of the plurality of different propulsion system configurations is input into the programmable arrays to configure the generic control software into custom control software that is customized for use and designed to operate with the particular propulsion system configuration.

Abstract: A controller for a chiller includes processing electronics configured to detect a plurality of surge events. The processing electronics create a surge map by calculating and plotting a point for each detected surge event in an at least two dimensional coordinate system. The surge map is displayed through the use of an electronic display system. The surge map describes at least three conditions of the chiller when the surge event was detected through the use of axis and non-axis representations. The processing electronics are further configured to control at least one setpoint for the chiller using the calculated surge map.

Abstract: A method for adapting a lambda control of an internal combustion engine having an exhaust gas probe disposed in an exhaust gas duct of the internal combustion engine as part of an exhaust gas monitoring system, wherein the adaptation is carried out on the basis of a comparison between a modeled and a measured signal after a predetermined change in the fuel-air ratio of an air-fuel mixture supplied to said internal combustion engine has taken place and wherein the measured signal is an actual value of an output signal of the exhaust gas probe and the modeled signal is a modal value, which is derived from the air-fuel mixture supplied to said internal combustion engine through the use of an exhaust gas model.

Abstract: Provided are a wastegate valve control device for an internal combustion engine and a wastegate valve control method for an internal combustion engine, which are capable of controlling a wastegate valve (WGV) to a desired open/closed state at low cost even when a reference position of the WGV is shifted from a full-closure position of the WGV. When a target WGV opening (control target value) is equal to or smaller than a threshold opening, a given opening is added to or subtracted from the target WGV opening while the WGV is controlled to perform an opening/closing operation based on the target WGV opening. By monitoring a change in throttle upstream pressure or driving current of a WGV actuator, an optimal target WGV opening corresponding to the shift of the reference position with respect to the full-closure position of the WGV is determined.

Abstract: A method for determining a characteristic for a pressure regulating valve of an injection system is described, using which fuel is injected into an internal combustion engine, in which a flow of the fuel which flows through the pressure regulating valve is set to a minimum and a control pressure of the fuel is reduced until the pressure regulating valve is opened, and in which at least one value for the characteristic is formed from a difference between a value for the control pressure, at which the pressure regulating valve opens, and a reference value for the control pressure.

Abstract: A method for operating an internal combustion engine is described, the internal combustion engine including a cylinder having an inlet valve for supplying fresh air from an intake manifold in a controlled manner, an air filling being set in a certain operating mode by predefining a closing point in time of the inlet valve in an intake stroke at a constant intake manifold pressure.

Abstract: A method for controlling the operation of a valve of a fuel injector. The method may include selecting an electrical current waveform from a plurality of selectable electrical current waveforms. The selected electrical current waveform is provided to the valve, which may be operated to control a characteristic of an injection event, such as, for example, fuel pressure, injection timing, and/or fuel mass, among others. The method further includes detecting an aberrant combustion event from the combustion of the injected fuel. If an aberrant combustion event is detected, the electrical current waveform associated with the injection event may be disabled. Additionally, upon detection of an aberrant combustion event, a value corresponding to the number of detected aberrant combustion events is incremented, which may be used to determine whether or not to continue to disable the selected waveform.

Abstract: A method for partial cylinder cutoff is provided. The method comprises operating a multi-cylinder internal combustion engine with applied ignition, in which an odd number n of cylinders is arranged in line, and during partial-load operation when engine load is below threshold, enabling a partial cutoff of the cylinders, the partial cutoff comprising operating each cylinder only intermittently such that each cylinder is fired and cut off in turn at an interval of (2*720° CA)/n.

Abstract: Disclosed is a method for monitoring a fuel injector, the injector including a piezoelectric actuator controlling a valve unit to open or close the injector, the fuel injector including an actuator play. The method includes: measuring a plurality of compensation times of the actuator play during a simulation step preceding an injection for a given plurality of fuel pressures; calculating a parameter representing the current actuator play per the measured compensation times; comparing the parameter representing the calculated current actuator play with a predetermined reference parameter of the actuator play; and transmitting a warning message if the reference parameter is exceeded; the parameter representative of the current actuator play being calculated on the basis of a polynomial function of the measured compensation times. The polynomial order of the polynomial function corresponding to the number of measured compensation times of the actuator play for different fuel pressures.

Abstract: A control apparatus for an internal combustion engine including a plurality of combustion chambers and a catalyst that cleans exhaust gases includes a controller configured to execute individual air-fuel ratio control in which an air-fuel ratio of an air-fuel mixture generated in at least one non-specific combustion chamber is controlled such that an average air-fuel ratio of the engine matches a target air-fuel ratio, based on an air-fuel ratio of an air-fuel mixture generated in at least one specific combustion chamber, the controller being configured to execute catalyst temperature increase control in which a temperature of the catalyst is increased, and the controller being configured to prohibit execution of the individual air-fuel ratio control when the catalyst temperature increase control is executed.

Abstract: A control system is provided with a piston TDC (top dead center) position variable mechanism and a valve operational characteristics variable mechanism. An actual distance between the valve and the piston of closest approach is calculated based on the actual operation states of these mechanisms. In addition, a limit distance of closest approach necessary to avoid interference between the valve and the piston is set, and, the piston TDC position variable mechanism and the valve operational characteristics variable mechanism are controlled to be driven to increase the actual distance.

Abstract: A method for operating an internal combustion engine is provided. The internal combustion engine has a compressor for adjusting a charge density in an intake pipe of the internal combustion engine and has an adjusting device, such as a variable valve gear, for adjusting a volumetric efficiency of the internal combustion engine. A dynamic setpoint quantity for the internal combustion engine is determined as a function of a difference between a load demand upon the internal combustion engine and a current load output of the internal combustion engine. The volumetric efficiency and the charge density are adjusted as a function of the dynamic setpoint quantity. An internal combustion engine and a vehicle are also provided.

Abstract: A system and attendant structural assembly operative to establish a coordinated mixture of gaseous and distillate fuels for an engine including an electronic control unit (ECU) operative to monitor predetermined engine data determinative of engine fuel requirements and structured to regulate ratios of the gaseous and distillate fuel of an operative fuel mixture for the engine. The system and assembly includes at least one mixing assembly comprising an integrated throttle body and air gas mixer directly connected to one another, wherein the throttle body is disposed in fluid communication with a pressurized gaseous fuel supply and the air gas mixer is disposed in fluid communication with a flow of intake air to a combustion section of the engine. In use, the throttle body is structured to direct a variable gaseous fuel flow directly to the air gas mixer for dispensing into the intake air flow to the combustion section.

Abstract: Various methods are described for controlling engine operation for an engine having a turbocharger and direction injection. One example method includes performing at least a first and second injection during a cylinder cycle, the first injection generating a lean combustion and the second injection injected after combustion such that it exits the cylinder unburned into the exhaust upstream of a turbine of the turbocharger; and adjusting at least the first injection based on engine speed, where the at least first and second injection are performed responsive to turbocharger speed.

Abstract: Methods and systems are provided for adjusting an engine output delivered in response to an operator pedal actuation based at least on a grade of vehicle travel. During uphill travel, in the presence of headwinds, and/or in the presence of a vehicle payload, the output may be increased while during downhill travel or in the presence of tailwinds, the output may be decreased. In this way, driver fatigue during travel over varying elevations, varying ambient conditions, and varying loads can be reduced.

Abstract: A method of operating an engine is disclosed, which includes determining a peak power condition for the engine, measuring a temperature associated with the engine at said peak power condition, comparing the temperature measured with a previously determined temperature associated with a known peak power condition of the engine, determining an offset value based on the comparison made in step, controlling at least one of an air-fuel mixture delivered to the engine or ignition spark timing based on said offset value. Various engine fuel delivery systems, carburetors, fuel injection and control systems also are disclosed.

Abstract: A compression ignition engine includes a high pressure injector for injecting a liquid fuel into a first combustion cylinder and a low pressure injector for injecting a gaseous fuel into a second combustion cylinder. A controller is coupled to the high pressure injector and the low pressure injector. The controller selects one of a liquid fuel mode and a gaseous fuel mode. If the liquid fuel mode is selected, air is compressed in a first cylinder, the compressed air is transferred to a second cylinder, and the liquid fuel is injected into the second cylinder. If the gaseous fuel mode is selected, air is compressed in the second cylinder, the compressed air is transferred to the first cylinder, and the gaseous fuel is injected into the first cylinder.