Revolution control apparatus for an internal combustion engine, and internal combustion engine provided with that revolution control apparatus

1. A revolution control apparatus of an internal combustion engine that performs engine revolution feedback control in which an engine revolution of the internal combustion engine, which has a plurality of cylinders, is detected and a fuel injection amount from fuel injection means is controlled so that the detected engine revolution approaches a target revolution, comprising:

revolution calculation and storage means for calculating, from a time that is required for a crank shaft to rotate by a predetermined angle from a compression upper dead center of each cylinder, the engine revolution in an expansion stroke of that cylinder, and storing this in association with that cylinder number; and

revolution feed and feedback revolution calculation means that, in determining the fuel injection amount based on the engine revolution that has been associated with that cylinder number and the target revolution, feeds back a revolution that is obtained by retroactively averaging the stored revolutions from the cylinder immediately prior to the cylinder before the cylinder that is immediately prior as the engine revolution, and calculates a feedback revolution by switching a number of retroactive cylinders according to an operation state of said internal combustion engine so as to control the revolution of the engine,

wherein said revolution feed and feedback revolution calculation means feeds back a revolution that is obtained by averaging the revolution from the cylinder immediately prior to a cylinder before the cylinder that is immediately prior in a case where it has determined that said internal combustion engine is in a steady operation state.

2. A revolution control apparatus of an internal combustion engine that performs engine revolution feedback control in which an engine revolution of the internal combustion engine, which has a plurality of cylinders, is detected and a fuel injection amount from fuel injection means is controlled so that the detected engine revolution approaches a target revolution, comprising:

revolution calculation and storage means for calculating, from a time that is required for a crank shaft to rotate by a predetermined angle from a compression upper dead center of each cylinder, the engine revolution in an expansion stroke of that cylinder, and storing this in association with that cylinder number; and

revolution feed and feedback revolution calculation means that, in determining the fuel injection amount based on the engine revolution that has been associated with that cylinder number and the target revolution, feeds back a revolution that is obtained by retroactively averaging the stored revolutions from the cylinder immediately prior to the cylinder before the cylinder that is immediately prior as the engine revolution, and calculates a feedback revolution by switching a number of retroactive cylinders according to an operation state of said internal combustion engine so as to control the revolution of the engine,

wherein said revolution feed and feedback revolution calculation means switches the number of retroactive cylinders for calculating the average revolution according to an amount of deviation between the target revolution and the engine revolution of the cylinder immediately prior, and reduces the number of retroactive cylinders for calculating the average revolution if the amount of deviation is large and increases the number of retroactive cylinders for calculating the average revolution if the amount of deviation is small.

3. A revolution control apparatus of an internal combustion engine that performs engine revolution feedback control in which an engine revolution of the internal combustion engine, which has a plurality of cylinders, is detected and a fuel injection amount from fuel injection means is controlled so that the detected engine revolution approaches a target revolution, comprising:

revolution calculation and storage means for calculating, from a time that is required for a crank shaft to rotate by a predetermined angle from a compression upper dead center of each cylinder, the engine revolution in an expansion stroke of that cylinder, and storing this in association with that cylinder number; and

revolution feed and feedback revolution calculation means that, in determining the fuel injection amount based on the engine revolution that has been associated with that cylinder number and the target revolution, feeds back a revolution that is obtained by retroactively averaging the stored revolutions from the cylinder immediately prior to the cylinder before the cylinder that is immediately prior as the engine revolution, and calculates a feedback revolution by switching a number of retroactive cylinders according to an operation state of said internal combustion engine so as to control the revolution of the engine,

wherein said revolution feed and feedback revolution calculation means switches the number of retroactive cylinders for calculating the average revolution according to an amount of fluctuation in the engine load, and reduces the number of retroactive cylinders for calculating the average revolution if the amount of fluctuation is large and increases the number of retroactive cylinders for calculating the average revolution if the amount of fluctuation is small.

4. A revolution control apparatus of an internal combustion engine that performs engine revolution feedback control in which an engine revolution of the internal combustion engine, which has a plurality of cylinders, is detected and a fuel injection amount from fuel injection means is controlled so that the detected engine revolution approaches a target revolution, comprising:

revolution calculation and storage means for calculating, from a time that is required for a crank shaft to rotate by a predetermined angle from a compression upper dead center of each cylinder, the engine revolution in an expansion stroke of that cylinder, and storing this in association with that cylinder number; and

revolution feed and feedback revolution calculation means that, in determining the fuel injection amount based on the engine revolution that has been associated with that cylinder number and the target revolution, feeds back a revolution that is obtained by retroactively averaging the stored revolutions from the cylinder immediately prior to the cylinder before the cylinder that is immediately prior as the engine revolution, and calculates a feedback revolution by switching a number of retroactive cylinders according to an operation state of said internal combustion engine so as to control the revolution of the engine,

wherein said revolution feed and feedback revolution calculation means feeds back the revolution that is obtained by retroactively averaging the revolution from the cylinder immediately prior to a cylinder before the cylinder that is immediately prior when operating under a reduced number of cylinders.

5. A revolution control apparatus of an internal combustion engine that performs engine revolution feedback control in which an engine revolution of the internal combustion engine, which has a plurality of cylinders, is detected and a fuel injection amount from fuel injection means is controlled so that the detected engine revolution approaches a target revolution, comprising:

revolution calculation and storage means for calculating, from a time that is required for a crank shaft to rotate by a predetermined angle from a compression upper dead center of each cylinder, the engine revolution in an expansion stroke of that cylinder, and storing this in association with that cylinder number; and

revolution feed and feedback revolution calculation means that, in determining the fuel injection amount based on the engine revolution that has been associated with that cylinder number and the target revolution, feeds back a revolution that is obtained by retroactively averaging the stored revolutions from the cylinder immediately prior to the cylinder before the cylinder that is immediately prior as the engine revolution, and calculates a feedback revolution by switching a number of retroactive cylinders according to an operation state of said internal combustion engine so as to control the revolution of the engine,

wherein said revolution feed and feedback revolution calculation means feeds back the engine revolution of the cylinder immediately prior when the internal combustion engine is idling.

6. A revolution control apparatus of an internal combustion engine that performs engine revolution feedback control in which an engine revolution of the internal combustion engine, which has a plurality of cylinders, is detected and a fuel injection amount from fuel injection means is controlled so that the detected engine revolution approaches a target revolution, comprising:

revolution calculation and storage means for calculating, from a time that is required for a crank shaft to rotate by a predetermined angle from a compression upper dead center of each cylinder, the engine revolution in an expansion stroke of that cylinder, and storing this in association with that cylinder number; and

revolution feed and feedback revolution calculation means that, in determining the fuel injection amount based on the engine revolution that has been associated with that cylinder number and the target revolution, feeds back a revolution that is obtained by retroactively averaging the stored revolutions from the cylinder immediately prior to the cylinder before the cylinder that is immediately prior as the engine revolution, and calculates a feedback revolution by switching a number of retroactive cylinders according to an operation state of said internal combustion engine so as to control the revolution of the engine,

wherein said revolution feed and feedback revolution calculation means switches the number of retroactive cylinders for calculating an average revolution in accordance with an engine load, and

wherein said revolution feed and feedback revolution calculation means feeds back the engine revolution of the cylinder immediately prior during a predetermined load correspond period if it has estimated the fluctuation in the engine load.

7. The revolution control apparatus of an internal combustion engine according to claim 6 ,

wherein said load correspond period can be set freely.

8. An internal combustion engine comprising any one revolution control apparatus according to any one of claims 1 - 4 and 5 - 7 .