A system and method for generating microwaves for microwave enhanced combustion (MEC) input to an MEC antenna of an internal combustion engine. The system uses a directional coupler to deliver the MEC input signal to the MEC antenna and to receive a reflected power signal from the MEC antenna. A first feedback path determines a desired frequency, based on the reflected power and using an impedance-matching controller that matches the reflected power to a desired frequency value. A second feedback path determines a power correction term. An open loop path determines a feedforward power term, as well as timing, for the MEC input signal, based on various engine conditions. The feedforward power term is corrected with the power correction term.

An engine idling control method for a construction machine includes setting, by an E-ECU, an initial engine RPM as a starting mode (S mode) by receiving a signal from a V-ECU at the time of an engine startup; receiving, by the E-ECU, a first instruction via an engine speed control switch in a state other than an automatic idle mode; activating the automatic idle mode when the first instruction is not input to a machine during a certain time period, and setting the engine RPM as the starting mode (S mode); deactivating the automatic idle mode when a second instruction is input to the machine via the engine speed control switch while the automatic idle mode is activated; and calculating, by the V-ECU, an actual torque required for a pump for starting the machine according to the second instruction when the automatic idle mode is deactivated, and sending the actual torque to the E-ECU.

Controlling a waste heat recovery system includes determining a difference in temperature (sensed T) between a working fluid (15) downstream of a first evaporator (16) and a working fluid (15) downstream of a second evaporator (20) wherein the first evaporator (16) and the second evaporator (20) are in parallel. Each receives engine exhaust gas and working fluid. At least a first valve (84) is selectively actuated to regulate flow of the working fluid into the first evaporator (16) and the second evaporator (20) responsive to the difference in temperature (sensed T). The first valve (84) regulates a flow of the working fluid into the first evaporator (16) and a second valve (86) regulates a flow of the working fluid into the second evaporator (20). A first feedforward signal (157) is generated for control of the first valve (84) based at least in part on the difference in temperature (sensed T).

A control device (10) for a supercharging system for supplying compressed intake air to an engine (6) includes: an engine controller (10A) including an engine signal input part (10A1) and an engine control part (10A2) configured to control an operational state of the engine and to compute a target boost pressure of a supercharger (4); and a turbo controller (10B2) including a turbo signal input part (10B1) and a turbo control part (10B2) configured to compute a margin of the supercharger. The control device is configured to compute a target boost-pressure corrected value by correcting the target boost pressure in accordance with a magnitude of the margin computed by the turbo control part, and to control a boost-pressure control unit (12) so that the boost pressure of the supercharger reaches the target boost-pressure corrected value.

A method for controlling a dual fuel engine system includes determining a gas flow target for an internal combustion engine of the dual fuel engine system, where the gas flow target is based on a gas power target of the internal combustion engine, a thermal efficiency estimate of the internal combustion engine, and a lower heating value (LHV) within the internal combustion engine. The method also includes adjusting the gas flow target based on at least one of a measured gas temperature or a measured gas injector pressure and determining at least one base gas injector command based on the adjusted gas flow target, a gas substitution rate estimate, and a gas substitution rate target. The method further includes determining, based on the at least one base gas injector command, a gas injector command for at least one engine bank.

Techniques for setting a boost target for a turbocharged engine comprise (i) operating the engine in a scavenging mode such that opening of intake and exhaust valves of cylinders of the engine overlap and (ii) while transitioning the engine in/out of the scavenging mode: determining an engine torque request, creating a torque reserve by setting independent targets for throttle inlet pressure (TIP) and intake manifold absolute pressure (MAP), determining a target TIP based on a target total air charge, engine speed, and a previously-determined target engine volumetric efficiency (VE), controlling a wastegate valve based on the target TIP, determining a target MAP based on the engine torque request, and controlling a throttle valve based on the target MAP. During steady-state scavenging operation, the controller calculates a conventional target TIP based on the engine torque request and controls the wastegate valve based on the conventionally calculated target TIP.

To provide a controller and a control method for an internal combustion engine capable of calculating a target value of controlled variable of internal combustion engine which realizes the target torque, while reducing the number of calculations using a torque characteristics function. A controller and a control method for an internal combustion engine calculates ignition sample numbers of ignition corresponding torques corresponding to the respective ignition sample numbers of ignition timings, by using a torque characteristics function relationship in which a relationship between driving condition and output torque is preliminarily set; and calculates an ignition torque approximated curve approximating a relationship between the ignition sample numbers of the ignition timings and the ignition sample numbers of the ignition corresponding torques; and calculates a target ignition timing corresponding to the target torque.

A two-stage air charging system for an internal combustion engine with mixed exhaust gas recirculation includes a high pressure exhaust gas recirculation loop, a low pressure exhaust gas recirculation loop, an air throttle system, a turbo air charging system, and an electric air charging system. A method to control the system includes monitoring desired operating target commands and operating parameters. Feedback control signals are determined based upon the monitored desired operating target commands and the monitored operating parameters. The two-stage air charging system is controlled based on system control commands for each of the high pressure exhaust gas recirculation loop, the low pressure exhaust gas recirculation loop, the air throttle system, the turbo air charging system and the electric air charging system.

Systems and methods are described for mitigating vehicle vibration through the control of a variable spring absorber that is part of a powertrain that includes the engine. In some such embodiments, an absorption frequency of the variable spring absorber is tuned in a feed forward manner based at least in part on the current engine speed and a factor indicative of the minimum repeating firing sequence cycle length associated with the current effective firing fraction (which in many implementations may be the denominator of the firing fraction).

An engine speed control system for an internal combustion engine includes a throttle, and a sensor that monitors a parameter indicative of pressure or density of fuel and air in an inlet manifold of the engine. The electronic control unit is coupled with the throttle and the sensor and structured to calculate a target mass flow through the throttle, a feedforward control term based on the target mass flow, and a feedforward control term based on data produced by the sensor. The electronic control unit is further structured to vary a position of the throttle based on the feedforward and feedback control terms to adjust a mass flow through the throttle toward the target mass flow. The control system is applicable in throttle governed as well as fuel governed systems.