公开(公告)号：US3927648A

公开(公告)日：1975-12-23

申请号：US47627274

申请日：1974-06-04

Applicant: NIPPON SOKEN

Inventor： KAWAI HISASI ,  IWASE KAZUO

IPC: F02P5/15 ,  G06F7/62 ,  F02P5/08

CPC classification number: G06F7/62 ,  F02P5/15 ,  Y02T10/46

Abstract: There is provided a digital electronic ignition timing control circuit for an internal combustion engine wherein a retard angle from the reference angular position of the engine which corresponds to the number of revolutions of the engine and the vacuum within the engine intake manifold is read out from a predetermined program, the retard angle thus read out is converted, in terms of a frequency which varies with a predetermined functional relationship, into a delay time from the moment at which the rotation of the engine passes the reference angular position, the frequency corresponding to the delay time is counted by a counter, and the expiration of the delay time from the moment of passing the reference angular position is computed in accordance with the count of the counter to determine the timing of the ignition. Thus, the system of this invention is free from deterioration with age, capable of timing the ignition of an engine with very high accuracy, capable of readily obtaining a different ignition timing characteristic by changing the program, is requiring no complicate computing circuitry, eliminates the computing time for an electronic ignition system through the use of a digital system and hence is superior in response characteristic.

Abstract translation: 提供了一种用于内燃机的数字电子点火正时控制电路，其中从发动机的参考角位置的发动机的延迟角对应于发动机的转数和发动机进气歧管内的真空从 将由此读出的延迟角按照预定的功能关系变化的频率转换成从发动机的转动通过参考角位置的时刻起的延迟时间，对应于 通过计数器计数延迟时间，并且根据计数器的计数来计算从通过参考角位置的时刻起的延迟时间的到期以确定点火的定时。 因此，本发明的系统不会因年龄而变差，能够以非常高的精度对发动机的点火进行定时，能够通过改变程序容易地获得不同的点火时间特性，不需要复杂的计算电路，消除了 通过使用数字系统的电子点火系统的计算时间，因此具有优异的响应特性。