Apparatus and method of controlling an engine

An apparatus for controlling an engine, the apparatus comprising:

• an engine including a cylinder generating power by combustion of fuel;
• a throttle valve configured to adjust a flow rate of intake air supplied to the cylinder;
• a supercharger configured to supply supercharged air to the cylinder;
• an intake valve configured to supply intake air by selectively opening and closing the cylinder;
• a variable valve timing device configured to adjust opening and closing timings of the intake valve;
• a variable valve duration device configured to adjust an opening duration of the intake valve;
• and
• a controller configured to adjust an amount of air inside of the cylinder by fixing an intake valve opening (IVO) timing and adjusting an intake valve closing (IVC) timing through the variable valve timing device and the variable valve duration device in a transition section from a time at which a demanded torque by a driver is input to a time at which the demanded torque is followed by the throttle valve or the supercharger,
• wherein when an amount of change in the demanded torque of the driver is smaller than a set value and a vehicle is in an acceleration state, the controller is configured to increase the amount of air inside the cylinder through the variable valve timing device and the variable valve duration device, and
• wherein:
• when the engine is an Atkinson cycle engine, the controller is configured to:
• decrease an opening duration of the intake valve through the variable valve duration device, and
• advance the intake valve opening and closing timing through the variable valve timing device.

A method of controlling an engine, the method comprising:

• determining, by a controller, whether an amount of change of a demanded torque by a driver is smaller than a set value;
• determining, by the controller, whether a vehicle is in an acceleration state or a deceleration state;
• and
• adjusting, by the controller, an amount of air inside of a cylinder of the engine by fixing an intake valve opening (IVO) timing and adjusting an intake valve closing (IVC) timing through a variable valve timing device and a variable valve duration device in a transition section from a time at which the demanded torque of the driver is input to a time at which the demanded torque of the driver is followed by a throttle valve or a supercharger,
• wherein:
• upon determining that the amount of change in the demanded torque of the driver is smaller than the set value and the vehicle is in the acceleration state, increasing the amount of air inside of the cylinder by controlling the variable valve timing device and the variable valve duration device;
• upon determining that the engine is a Miller cycle engine, increasing an opening duration of the intake valve through the variable valve duration device, and delaying the intake valve opening and closing timing through the variable valve timing device;
• and
• upon determining that the engine is an Atkinson cycle engine, decreasing the opening duration of the intake valve through the variable valve duration device, and advancing the intake valve opening and closing timing through the variable valve timing device.