Internal combustion engine ignition timing device

Internal-combustion engines – Charge forming device – Fuel injection system

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123418, F02P 515

Patent

active

051037882

ABSTRACT:
In order to reduce erroneous ignition timing to the maximum possible degree, an arbitrary point is defined between the trailing edge of a basic control pulse and TDC. The ADV at which ignition should occur is determined to be advanced or retarded with respect to the same. If it is found that the ADV is advanced with respect to the arbitrary point where a calculation, which is initiated at the trailing edge of the basic control pulse cannot be completed in time, a time period from the leading edge is derived and a counter started. Alternatively, if a count is not proceeding and a trailing edge is detected, a second time is derived and the counter started. If it is found that the counter is running but the degree of ignition advance is such as to fall between the leading and trailing edges of the basic reference control pulse, the count is stopped and ignition immediately induced.

REFERENCES:
patent: 4298941 (1981-11-01), Furuhashi
patent: 4491121 (1985-01-01), Miura et al.
patent: 4553208 (1985-11-01), Akiyama et al.
patent: 4584978 (1986-04-01), Sasaki et al.
patent: 4586473 (1986-05-01), Nguyen
patent: 4643150 (1987-02-01), Miura et al.
patent: 4665884 (1987-05-01), Yoshida et al.
patent: 4831318 (1989-05-01), Yuasa et al.

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