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An electronic control for determining knocking in an internal combustion engine having an intake injector for injecting fuel into an air intake port and an in-cylinder injector for directly injecting fuel into a combustion chamber. Knocking is determined based on an output signal from a knock sensor

An electronic control for determining knocking in an internal combustion engine having an intake injector for injecting fuel into an air intake port and an in-cylinder injector for directly injecting fuel into a combustion chamber. Knocking is determined based on an output signal from a knock sensor during a knock determination period. The electronic control unit alters the knock determination period in accordance with the ratio of the amount of fuel injected by the two injectors.

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What is claimed is: 1. An apparatus for determining whether or not knocking has occurred in an internal combustion engine, the internal combustion engine including a first injector for directly injecting fuel into a combustion chamber, a second injector for injecting fuel into an intake system, and

What is claimed is: 1. An apparatus for determining whether or not knocking has occurred in an internal combustion engine, the internal combustion engine including a first injector for directly injecting fuel into a combustion chamber, a second injector for injecting fuel into an intake system, and a knock sensor for detecting information relating to knocking and generating an output signal, the apparatus comprising: a knocking determination means for determining whether or not knocking has occurred based on the output signal of the knock sensor during a knock determination period; and an altering means for altering the knock determination period in accordance with a ratio between the amount of fuel the first injector injects and the amount of fuel the second injector injects. 2. The apparatus according to claim 1, wherein the altering means advances the timing the knock determination period starts as the ratio of the fuel the first injector injects increases. 3. The apparatus according to claim 1, wherein the altering means alters the knock determination period in accordance with the period that the first injector injects fuel such that noise generated by operation of the first injector does not overlap with the output signal of the knock sensor during the knock determination period. 4. The apparatus according to claim 3, wherein the altering means sets the knock determination period such that the knock determination period does not overlap with the period that the first injector injects fuel. 5. The apparatus according to claim 1, wherein the altering means alters the knock determination period in accordance with the period that the first injector injects fuel such that noise generated by operation of the first injector constantly overlaps with the output signal of the knock sensor during the knock determination period. 6. The apparatus according to claim 5, wherein the altering means sets the knock determination period such that the period that the first injector injects fuel entirely overlaps with at least part of the knock determination period. 7. An apparatus for determining whether or not knocking has occurred in an internal combustion engine, the internal combustion engine including a first injector for directly injecting fuel into a combustion chamber, a second injector for injecting fuel into an intake system, and a knock sensor for detecting information relating to knocking and generating an output signal, the apparatus comprising: a knocking determination means for comparing the output signal of the knock sensor with a knock determination level to determine whether or not knocking has occurred; and a changing means for changing the knock determination level in accordance with a ratio between the amount of fuel the first injector injects and the amount of fuel the second injector injects. 8. The apparatus according to claim 7, wherein the changing means increases the knock determination level as said ratio increases. 9. The apparatus according to claim 8, wherein the changing means changes the knock determination level such that the knock determination level is greater than a noise level generated by operation of the first injector. 10. An apparatus for determining whether or not knocking has occurred in an internal combustion engine, the internal combustion engine including a first injector for directly injecting fuel into a combustion chamber, a second injector for injecting fuel into an intake system, and a knock sensor for detecting information relating to knocking and generating an output signal, the apparatus comprising: a controller for determining whether or not knocking has occurred based on the output signal of the knock sensor during a knock determination period and for altering the knock determination period in accordance with a ratio between the amount of fuel the first injector injects and the amount of fuel the second injector injects. 11. The apparatus according to claim 10, wherein the controller advances the timing the knock determination period starts as the ratio of the fuel the first injector injects increases. 12. The apparatus according to claim 10, wherein the controller alters the knock determination period in accordance with the period that the first injector injects fuel such that noise generated by operation of the first injector does not overlap with the output signal of the knock sensor during the knock determination period. 13. The apparatus according to claim 12, wherein the controller sets the knock determination period such that the knock determination period does not overlap with the period that the first injector injects fuel. 14. The apparatus according to claim 10, wherein the controller alters the knock determination period in accordance with the period that the first injector injects fuel such that noise generated by operation of the first injector constantly overlaps with the output signal of the knock sensor during the knock determination period. 15. The apparatus according to claim 14, wherein the controller sets the knock determination period such that the period that the first injector injects fuel entirely overlaps with at least part of the knock determination period. 16. An apparatus for determining whether or not knocking has occurred in an internal combustion engine, the internal combustion engine including a first injector for directly injecting fuel into a combustion chamber, a second injector for injecting fuel into an intake system, and a knock sensor for detecting information relating to knocking and generating an output signal, the apparatus comprising: a controller for comparing the output signal of the knock sensor with a knock determination level to determine whether or not knocking has occurred and for changing the knock determination level in accordance with a ratio between the amount of fuel the first injector injects and the amount of fuel the second injector injects. 17. The apparatus according to claim 16, wherein the controller increases the knock determination level as said ratio increases. 18. The apparatus according to claim 17, wherein the controller changes the knock determination level such that the knock determination level is greater than a noise level generated by operation of the first injector.