| 摘要 |
A system and method for controlling ignition timing for an internal combustion engine in which an engine operating range is divided into two ranges, i.e., a first range in which there is no possibility of an erroneous determination of malfunction in a knock detection system for detecting occurrence of engine knocking and a second range outside the first range. The determination of the malfunction in the first range has a higher priority than that in the second range. A fail safe function to cope with malfunctions in the knock detection system is performed over the whole engine operating range. Hence, an erroneous determination of malfunction in the knock detection system made in a low engine load and low engine speed range in which malfunction of the knock detection means is difficult to detect may be corrected or confirmed according to the result of a determination of a malfunction in the knock detection system in the first range. Consequently, the occurrence of engine knocking can properly be suppressed and reduction of engine output performance can be prevented through the whole engine operating range.
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