Fuel injection control device and method for continuously controlling fuel injection during engine operation based on throttle position

A fuel injection control device for an internal combustion engine for continuously executing correction of a fuel injection amount based on a throttle opening of the engine,

• said fuel injection control device comprising:
• an electronic control unit operatively connected to a plurality of sensors in an internal combustion engine, said plurality of sensors including a throttle position sensor for detecting a throttle opening;
• a throttle opening change detection unit for detecting a change in a throttle opening;
• a basic-injection-use-map stored in a recordable data storage medium for deriving a basic injection amount corresponding to a sensed throttle opening;
• an additional-injection-use map stored in a recordable data storage medium for deriving an additional injection amount corresponding to a change in a sensed throttle opening;
• wherein said fuel injection control device is configured to divide each engine cycle into a predetermined number of stages;
• said predetermined number of stages comprising a first calculation stage, and a second calculation stage provided after the first calculation stage;
• wherein said fuel injection is operated such that:
• said basic injection amount is obtained by applying a throttle opening measured in the first calculation stage to the basic-injection-use map;
• a first injection amount is obtained by applying a change in a throttle opening measured in the first calculation stage to the additional-injection-use map;
• and
• a second injection amount obtained by applying a change in a throttle opening measured in the second calculation stage to the additional-injection-use map;
• wherein
• said first injection amount and said second injection amount are compared with each other;
• when the second additional injection amount is greater than the first additional injection amount, an additional fuel injection with an amount independent from the basic injection amount is performed based on a calculated injection amount obtained by subtracting the first injection amount from the second injection amount;
• and
• when the first additional injection amount is greater than the second additional injection amount, the basic injection amount calculated in the first calculation stage is corrected.

A method of continuously controlling a fuel injection amount based on a throttle opening of an internal combustion engine, wherein each engine cycle during operation of the engine is divided into a predetermined number of stages comprising a first calculation stage, and a second calculation stage provided after said first calculation stage;

• said method comprising the steps of
• a) monitoring a throttle opening using a throttle position sensor;
• b) deriving a basic injection amount corresponding to a sensed throttle opening at said first calculation stage using a basic-injection-use map;
• c) deriving a first additional injection amount corresponding to a change in a throttle opening at said first calculation stage using an additional-injection-use map;
• d) deriving a second additional injection amount corresponding to a change in a throttle opening at said second calculation stage using said additional-injection-use map;
• e) comparing said first additional injection amount and said second additional injection amount;
• f) when the second additional injection amount is greater than the first additional injection amount, applying an additional calculated injection amount obtained by subtracting the first additional injection amount from the second additional injection amount;
• when the first additional injection amount is greater than the second additional injection amount, correcting the basic injection amount;
• and
• g) repeating steps a-f as needed.