Patent ID: 10167809

Abstract:
Disclosed are multi-pulse fuel injection systems, control logic for operating such systems, and direct-injection engines having multi-pulse fuel delivery capabilities. A method is disclosed for operating the fuel injection system of an internal combustion engine (ICE) assembly. The method includes a vehicle controller transmitting command signals to the fuel injectors to inject a first pilot quantity of fuel (QP1) and, subsequently, inject a second pilot quantity of fuel (QP2), distinct from QP1, after a first dwell time between QP1 and QP2 during a single combustion cycle of the ICE assembly. The vehicle controller also transmits command signals to the fuel injectors to inject a third pilot quantity of fuel (QP3), greater than QP1 and QP2, after a second dwell time between QP2 and QP3, and then inject a fourth pilot quantity of fuel (QP4), less than QP3, after a third dwell time between QP3 and QP4 during the combustion cycle.