SEQUENTIAL INJECTION SYSTEM WITH PULSE OVERLAP

摘要

580-79-0090 SEQUENTIAL INJECTION SYSTEM WITH PULSE OVERLAP A multipoint electronic fuel injection system with overlapping sequential injector actuation is disclosed. A plurality of dual injector driver circuits are provided corresponding to an equivalent number of solenoid fuel injector pairs supplying fuel to an internal combustion engine. The injectors are partitioned into two groups with each pair assigned one injector from each group. By sequentially actuating first members of one group and then members of the other, every injector can be actuated for an extended portion of an injection cycle up to one full engine revolution. A bilevel select signal initiated with the actuation signal is gated to each driver circuit to enable each injector of a pair for one half of the sequencing period. Associated with each driver circuit is an independent pulse generator which is additionally triggered in the sequence. The duration of the pulse width signals from the generators are dependent on the instantaneous engine operating parameters at the time of actuation. Further included is an inhibit feature for each pulse generator operable to extend the pulse width for the duration of time between two actuations. The pulse width is extended by the inhibit feature for cold cranking pulses during starting conditions and for acceleration enrichment pulses. Provision is also made for blanking the pulse width signals to the driver circuits during conditions when the engine may flood.