A control device for an engine includes an ECU. The ECU is configured to: control an actual fuel pressure supplied to a fuel injector to a target fuel pressure; calculate a required energization time required for fuel injection equivalent in amount to a required injection quantity; set a energization time for each injection based on the required energization time; execute a switching processing for switching a manner in which the energization time is set when the required energization time is shorter than a predetermined time; set the required energization time as a set value of the energization time through the switching processing when a deviation between the actual fuel pressure and the target fuel pressure is equal to or larger than a predetermined value; and set the predetermined time as the set value of the energization time when the deviation is less than the predetermined value.

The present disclosure relates to internal combustion engines. The teachings thereof may be embodied in methods and devices for controlling the combustion processes taking place in the cylinders of an internal combustion engine. A method for controlling a combustion process in an internal combustion engine may include: measuring an actual camshaft position; measuring the actual rail pressure; calculating a phase correction value based on the measured actual rail pressure and a mass of fuel to be injected; calculating corrected actual camshaft positions based on the measured actual camshaft position and the respective phase correction value; calculating a mass of air depending on the determined corrected actual camshaft position; and calculating a fuel injection mass based on the mass of air determined for each cylinder.

A method for sensing a closing time of an injector using an artificial neural network may include: sensing, by a controller, a voltage generated by an injector; performing, by the controller, a preprocess to derive an input matrix using variation characteristics of the voltage; and performing, by the controller, a closing time prediction to derive a closing time of the injector by an artificial neural network model including an input layer including the input matrix, a hidden layer, and an output layer.

A method is disclosed of controlling operation of a fuel injector in response to measuring a quantity of fuel injected by the fuel injector from a fuel accumulator to an engine cylinder during operation of a fuel pump that delivers fuel to the accumulator, comprising: determining an average pressure of the fuel accumulator during a first time period before a fuel injection event; predicting a mass of fuel delivered to the fuel accumulator during a pumping event (Q.sub.pump); determining an average pressure of the fuel accumulator during a second time period after the fuel injection event; estimating a leakage of fuel; computing the injected fuel quantity by adding the average pressure during the first time period to Q.sub.pump, and subtracting the average pressure during the second time period and the leakage; and using the computed injected fuel quantity to control operation of the fuel injector.

A control device for an engine, the engine includes an exhaust gas control apparatus that is configured to store NOx and react NOx with a reduction agent. The control device includes an electronic control unit. The electronic control unit is configured to: (i) execute a rich spike control, the rich spike control is a control executed to temporarily change an in-cylinder air-fuel ratio from a leaner air-fuel ratio than the stoichiometric air-fuel ratio to the stoichiometric air-fuel ratio or a richer air-fuel ratio than the stoichiometric air-fuel ratio, and (ii) vary an overlap amount of an intake valve and an exhaust valve such that the overlap amount is less during non-execution of the rich spike control than during execution of the rich spike control, in an operation range where a pressure of the intake port becomes higher than a pressure of the exhaust port.

In control device of an internal combustion engine, for each first period, a calculation unit calculates number of fuel injections within one combustion cycle and fuel injection rate. For first period, a first storage unit stores number of fuel injections and fuel injection rate of calculation unit. For each second period, a reference unit refers to the number of fuel injections and fuel injection rate stored by the first storage unit. A second storage unit stores for an interval, from the start time of the first fuel injection until start of the last fuel injection of at least one combustion cycle, the number of fuel injections and fuel injection rate referred to by reference unit. A control unit controls a fuel injection valve so that fuel is injected in accordance with the number of fuel injections fuel injection rate stored by second storage unit.

A method for engine combustion noise feedback control includes calculating an engine combustion noise target value by a controller. A cylinder pressure is measured after combustion of fuel according to a main injection timing and an amount of pilot fuel based on the calculated engine combustion noise target value. A combustion noise index (CNI) is calculated by converting the measured cylinder pressure into a cylinder pressure level. The feedback pilot injection is controlled in which the CNI is applied to injection variable control while controlling the main injection timing and the amount of pilot fuel.

On the basis of absolute values α and β of variations, before and after actuation of an exhaust brake, of fuel-injection and intake-air amounts, respectively, an exhaust brake is determined to normally operate when the absolute values α and β of the variations of the fuel-injection and intake-air amounts are not less than fuel-injection and intake-air variation thresholds, respectively; the exhaust brake is determined to have failure when the absolute values α and β of the variations of the fuel-injection and intake-air amounts are less than the fuel-injection and intake-air variation thresholds, respectively.

A method for detecting variations between the quantities of fuel injected into cylinders by fuel injection devices and correcting the fuel injection quantity variation while minimizing the computational load on a drive device and the level of performance required of a pressure sensor includes a drive device for fuel injection control, wherein movable valves are driven so that predetermined quantities of fuel are injected by applying, for the duration of a set energization time, a current that will reach an energization current to solenoids of a plurality of fuel injection devices which open/close fuel flow paths. The drive device is characterized in that the set energization time or energization current is corrected on the basis of a pressure detection value from a pressure sensor that is attached to a fuel supply pipe disposed upstream of the plurality of fuel injection devices.

An engine control system controls a work machine including an engine, a fuel injection device that injects fuel into the engine, and a hydraulic pump that is driven by the engine. The rotation state amount specification unit specifies a rotation state amount related to rotation of the engine. The injection amount determination unit determines a fuel injection amount by the fuel injection device based on the rotation state amount.