A control method of a fuel injection injector may include: detecting a first current which is applied to an injector, detecting a first voltage which is generated in the injector; calculating an opening timing of the injector using a variation characteristic of the first current; and calculating a closing timing of the injector using a variation characteristic of the first voltage. The method may further include: calculating an actual fuel injection amount through an opening duration between the opening timing and the closing timing; and correcting the closing timing or the opening timing of the injector based upon a difference in value between the actual fuel injection amount and a target fuel injection amount.

An electronic carburetor injection system is provided for an internal combustion engine. The electronic carburetor injection system is a standalone, user programmable fuel injection system that delivers additional fuel to the engine whenever a lean fuel/air mixture is delivered by a carburetor. The electronic carburetor injection system includes a fuel injector that delivers liquid fuel in the form of a spray discharge. A plate supports the fuel injector between the carburetor and an intake manifold of the engine. The plate includes an injector port that allows the spray discharge to enter the intake manifold without interfering with operating the carburetor. An engine control unit operates the fuel injector according to signals received from an oxygen sensor that is disposed within an exhaust system of the engine. During operation, the electronic carburetor injection system maintains the fuel/air mixture within a proper range across multiple driving conditions and changing environmental conditions.

An engine operation control apparatus and engine operation control method of a vehicle are provided. The engine operation control apparatus includes a coolant temperature sensor that detects a coolant temperature of a coolant line which passes through an engine. Further, the apparatus includes first and second maps in which corresponding engine operating points are mapped to a vehicle speed, a gear stage, a driver requesting torque, and an electric field load amount of the vehicle. A controller determines a candidate operating point using any one of the first and second maps based on a comparison between the coolant temperature and a predetermined threshold value and determines an optimal operating point of the engine using the candidate operating point.

An engine control system includes a prediction module that, during an exhaust stroke of a first cylinder of an engine, determines a predicted intake manifold pressure at an end of a next intake stroke of a second cylinder following the first cylinder in a firing order of the cylinders. An air per cylinder (APC) module determines a predicted mass of air that will be trapped within the second cylinder at the end of the next intake stroke of the second cylinder based on the predicted intake manifold pressure. A fueling module controls fueling of the second cylinder during the next intake stroke based on the predicted mass of air.

A fuel property detection apparatus detects fuel properties based on cetane number and density of a tested fuel. Tested fuel is examined in terms of ignition timing, and, when the tested fuel has an ignition timing earlier than a threshold, the tested fuel is identified as having a standard cetane number. When the tested fuel has an ignition timing later than the threshold, the tested fuel is identified as having a low cetane number. An advance angle of the ignition timing is increased for yielding a greater ignition timing difference between a light property fuel and a heavy property fuel, and, in such manner, the difference therebetween is detected. When an advancement of the ignition timing is greater than a threshold, the fuel property is identified as heavy, and, when an advancement of the ignition timing is smaller than the threshold, the fuel property is identified as light.

A gaseous fuel supply for an engine at a wellbore can be regulated using a control system. The control system can include a processing device communicatively coupled to one or more sensors to receive a fuel property measurement from the one or more sensors. The fuel property measurement can correspond to a first fuel source of the engine that can be used as the fuel supply for the engine to power an equipment to perform a wellsite operation. Additionally, the processing device can identify a predefined range of the fuel supply that corresponds to a target performance level of the engine. Based on the fuel property measurement, the processing device can determine that the first fuel source is outside of the predefined range. In response, the processing device can provide a second fuel source as the fuel supply. The second fuel source can enable the engine to operate at the target performance level.

A start control device for an engine includes an engine control unit, a motor control unit, and a control unit which controls the engine control unit and the motor control unit, wherein the control unit, when transferring an engine restart control mode from a motoring control state to a fuel combustion control state, executes the transfer via a motor/engine combined control state, and sets the timing of transferring from the motoring control state to the motor/engine combined control state, to a timing at which a crank angle of a cylinder where fuel is combusted first after starting fuel injection reaches a crank angle at which it is estimated that torque is generated by the first combustion of fuel in the cylinder.

A first control unit executes a valve stop inertial running including stopping an intake valve and an exhaust valve in a closed state during rotation of an output shaft, stopping supply of fuel to an engine, and setting a clutch in an engaged state to drive pistons of the engine by a rotational force from driving wheels. A second control unit executes a valve operation running including operating the intake valve and the exhaust valve during the rotation of the output shaft, and supplying the fuel to the engine based upon an intake conduit pressure. When a cancellation request is made during execution of the valve stop inertial running, a transient control unit operates the intake valve and the exhaust valve, and controls a throttle valve to an idling opening or less, thereby supplying a negative pressure to an intake passage.

In a control system for an internal combustion engine that can use a plurality of kinds of fuel including compressed natural gas, the invention prohibits a changeover from CNG to another fuel from being made in a period from a time when CNG is used for the first time after the start of the internal combustion engine to a time when it is determined that properties of CNG do not need to be learned, or a period from the time when CNG is used for the first time after the start of the internal combustion engine to a time when a processing of learning the properties of CNG ends.

A drive system for a vehicle comprises two electrical machines arranged between a combustion engine and an input shaft to a gearbox. The first machine's rotor and the input shaft of the gearbox are each connected to a separate component of a planetary gear. The second electrical machine's rotor is connected with the output shaft of the combustion engine, which is connected with another component of the planetary gear. A first locking means may be moved between a locked position, in which the planetary gear's three components rotate at the same rotational speed, and a release position, allowing for different rotational speeds. A second locking means is moveable between a locked position, in which the output shaft of the combustion engine is locked together with the second machine's rotor and a release position, in which the combustion engine's output shaft is disconnected from the second machine's rotor.