An engine operation control apparatus includes a controller configured to: decide an engine operation time point based on a lookup table in which a learning value that is previously learned is stored when a request to switch to an HEV mode occurs; determine whether to engage an engine clutch by comparing an engine RPM when a speed of an engine is synchronized with a speed of a motor with a first motor RPM; operate the engine at the engine operation time point and control engagement of the engine clutch depending on the determination; and store the engine operation time point based on a second motor RPM at a synchronization completion time point when a learning condition of the engine operation time point is satisfied when the speed of the engine and the motor are synchronized.

Methods and systems are provided for diagnosing a cylinder valve deactivation mechanism in an engine system having cam-actuated valves. Movement of a latch pin of the deactivation mechanism is inferred from an induction current generated by a solenoid coupled to the latch pin, and the inferred movement is used to diagnose operation of cylinder valve deactivation mechanism. The inferred movement and a profile of the induction current is also used to estimate camshaft and crankshaft timing for improved cylinder fuel delivery in the absence of a camshaft sensor.

A control device for a hybrid electric vehicle includes an electronic control unit. The electronic control unit is configured to perform a start-up control of shifting the connection and disconnection clutch to a coupled state at the time of starting the internal combustion engine to rotate the internal combustion engine by the driving torque of the electric motor, and starting the first fuel injection mode using the direct injection injector. The electronic control unit is configured to switch from the first fuel injection mode to a second fuel injection mode for using the port injector prior to an end of the start-up control when the number of times of combustion cycles of the internal combustion engine with the first fuel injection mode reaches a predetermined first target number of times.

A port injection valve injects fuel into an intake passage. A controller increases a base injection amount over a predetermined period after the internal combustion engine is started and gradually decreases an increase correction ratio of the base injection amount. One of two processes, a multiple injection process and a single injection process, is selected in order to inject the increased base injection amount of fuel. The increase correction ratio is set to be a smaller value in the multiple injection process than in the single injection process.

A method of operating a forced induction gaseous-fueled engine includes mixing gaseous-fuel and engine intake air to form a mixture at a fuel mixer. The method includes delivering the mixture to an intake manifold by at least partially bypassing a charge air cooler.

Methods and systems are provided for diagnosing a cylinder valve deactivation mechanism in an engine system having cam-actuated valves. Movement of a latch pin of the deactivation mechanism is inferred from an induction current generated by a solenoid coupled to the latch pin, and the inferred movement is used to diagnose operation of cylinder valve deactivation mechanism. The inferred movement and a profile of the induction current is also used to estimate camshaft and crankshaft timing for improved cylinder fuel delivery in the absence of a camshaft sensor.

An electronic control unit performs a cylinder-by-cylinder correction of a fuel injection amount to cause differences among air-fuel ratios of air-fuel mixture burned in multiple cylinders. In a case in which the cylinder-by-cylinder correction of the fuel injection amount results in a cylinder in which combustion is performed at an air-fuel ratio richer than an output air-fuel ratio, the output air-fuel ratio being an air-fuel ratio at which combustion torque is maximized, the electronic control unit performs a cylinder-by-cylinder correction of ignition timing such that the ignition timing of the cylinder in which combustion is performed at the air-fuel ratio richer than the output air-fuel ratio becomes more advanced than the ignition timing of the other cylinders.

Systems, apparatuses and methods for systematically executing a diagnosis and fault isolation of a failure condition for an engine during a cranking test of the engine. Examples of the failure condition include, but are not limited to, cylinder-by-cylinder compression conditions, excessive blow-by conditions, valve failures, leaks, and/or obstructions of the intake, exhausts, crankcase ventilation, and/or exhaust gas recirculation systems.

An internal combustion engine comprising at least one turbo charger, which comprises a compressor, at least one bypass valve, through which the compressor can be bypassed by at least a partial stream of air or an air-fuel mixture, and a control unit is provided. The control unit is configured to open or closed loop control the bypass valve. As such, the control unit is configured to at least partially open the at least one bypass valve and keep the at least one bypass valve open during a start of the internal combustion engine. The control unit is also configured to keep the at least one bypass valve open until an engine parameter of the internal combustion engine satisfies a predetermined startup criterion.

The present invention relates to a method (100) for cold start optimization of an internal combustion engine (10) comprising: determining (110) a start of an engine preheating device (12); transmitting (115) a selected coolant temperature T.sub.cool.sub._.sub.trans to an engine control unit (14); and adapting (140) the selected coolant temperature T.sub.cool.sub._.sub.trans transmitted to the engine control unit (14) to a current coolant temperature T.sub.coll.sub._.sub.current during a time interval t following the start of the internal combustion engine (10). The present invention further relates to an auxiliary control unit (22) which is configured to execute the method (100).