초록 ▼

A number of embodiments of engine spark control systems wherein the engine speed is reduced in response to the sensing of an abnormal or an external condition and wherein the spark timing is altered when the spark is interrupted to preclude the likelihood of backfiring in the exhaust system or firin

A number of embodiments of engine spark control systems wherein the engine speed is reduced in response to the sensing of an abnormal or an external condition and wherein the spark timing is altered when the spark is interrupted to preclude the likelihood of backfiring in the exhaust system or firing back in the induction system. In some embodiments, the sensed condition is an abnormal running condition and in other embodiments the sensed condition is shifting of the transmission. The backfiring and firing back is precluded primarily by advancing the spark from the idle spark advance.

대표청구항 ▼

In a spark control for an internal combustion engine comprising spark timing means for firing a spark plug in accordance with a first spark advance curve in relation to an engine characteristic at a given speed range and a second, different advance curve in relation to said engine characteristic and

In a spark control for an internal combustion engine comprising spark timing means for firing a spark plug in accordance with a first spark advance curve in relation to an engine characteristic at a given speed range and a second, different advance curve in relation to said engine characteristic and within the given speed range, one of said advance curves providing a fixed spark advance and means for selecting which of said advance curves control spark timing within the given speed range.