초록 ▼

A vehicle mounted, spark ignited, internal combustion engine subject to bursts of ringing knock vibration of varying duration corresponding to knock of varying intensity includes apparatus effective to generate pulses in response to the bursts and of corresponding duration. Further apparatus delays

A vehicle mounted, spark ignited, internal combustion engine subject to bursts of ringing knock vibration of varying duration corresponding to knock of varying intensity includes apparatus effective to generate pulses in response to the bursts and of corresponding duration. Further apparatus delays the trailing edge of each pulse by a common predetermined duration to favorably reduce the ratio of the durations of such pulses before application to apparatus effective to control a knock reducing parameter of the engine. The reduced ratio of duration between short and long pulses provides more uniform control over the total range of knock intensity. The engine may also include apparatus to delay the leading edge of each pulse by a common predetermined duration to eliminate short noise pulses and improve the knock signal to noise ratio. If so, this apparatus is inserted prior to the trailing edge delay apparatus and the common predetermined duration of the latter is greater than that of the former.

대표청구항 ▼

In combination: a vehicle mounted, spark ignited internal combustion engine of the type which occasionally exhibits bursts of knock induced engine vibrations, the knock induced vibration bursts being of varying intensity and being characterized by durations varying directly with said intensity; firs

In combination: a vehicle mounted, spark ignited internal combustion engine of the type which occasionally exhibits bursts of knock induced engine vibrations, the knock induced vibration bursts being of varying intensity and being characterized by durations varying directly with said intensity; first means effective to sense the knock induced vibration bursts and generate pulses having durations varying directly with the durations of the bursts; second means effective to lengthen selected ones of the pulses by a common predetermined duration, whereby the ratio of durations between the shorter pulses indicating less intense knock and the longer pulses indicating more intense knock is decreased; and third means effective, at least at some times, to control a knock reducing parameter of said engine in response to the lengthened pulses to limit knock intensity, whereby the reduced ratio of duration between shorter and longer pulses provides more effective control of both less and more intense knock.