公开(公告)号：US4020807A

公开(公告)日：1977-05-03

申请号：US433652

申请日：1974-01-16

申请人： Giorgio Del Zotto ,  Mario Costa

发明人： Giorgio Del Zotto ,  Mario Costa

IPC分类号： F02P5/155 ,  F02P1/00

CPC分类号： F02P5/1556 ,  Y02T10/46

摘要： In order to vary the timing of the ignition of an air/fuel mixture in a cylinder of an internal-combustion engine as a function of engine speed, a flip-flop is set by an engine-controlled switch at a predetermined point t.sub.0 in the cycle, in a position preceding by an angle .alpha..sub.0 the upper-dead-center position of an associated piston, to effect a rapid discharge and to start a slow recharge, at constant rate, of a capacitor C.sub.1 forming part of a time/voltage converter. The maximum voltage attained by this capacitor at the end of a cycle, as a measure of cycle length T, is registered in an ancillary capacitor C.sub.3 as another capacitor C.sub.2, forming part of a voltage/time converter, also begins charging at time t.sub.0 at a rate making the charges of capacitors C.sub.2 and C.sub.3 equal on or before the attainment of the UDC position. This equality is detected by a comparator which thereupon, at a time t.sub.0 +t.sub..gamma., resets the flip-flop to trigger an igniter for the associated cylinder. The charging rate of capacitor C.sub.2 may be modified by one or more sensing circuits responsive to external parameters and/or by one or more threshold circuits upon the charge of capacitor C.sub.1 or C.sub.2 reaching a predetermined level. Capacitors C.sub.2 and C.sub.3 are discharged upon the resetting of the flip-flop, the recharging of capacitor C.sub.3 beginning shortly thereafter.

摘要翻译： 为了改变作为发动机转速的函数的内燃机的气缸中的空气/燃料混合物的点火时间，触发器由发动机控制的开关在预定点t0设定在 循环，在相关联的活塞的上死点位置之前的角度α0的位置，以形成部分时间/电压的电容器C1以恒定速率进行快速放电和慢速再充电 转换器。 作为循环长度T的测量，该电容器在循环结束时获得的最大电压被记录在辅助电容器C3中，作为形成电压/时间转换器的一部分的另一个电容器C2也在时间t0开始充电 在达到UDC位置之前或之前使电容器C2和C3的电荷相等的速率。 这种相等性由比较器检测，因此在时间t0 +tγ，复位触发器以触发关联的气缸的点火器。 当电容器C1或C2的电荷达到预定电平时，电容器C2的充电速率可由响应于外部参数的一个或多个感测电路和/或由一个或多个阈值电路来修改。 电容器C2和C3在触发器复位时被放电，电容器C3在此后不久开始充电。