Control system and method for preventing stochastic pre-ignition in an engine

摘要

A control system for an engine includes a spark module and a fuel module. The spark module advances spark timing of a cylinder R degrees past a spark limit for N consecutive cylinder firing events, and retards spark timing of the cylinder past the spark limit for M consecutive cylinder firing events after the N consecutive cylinder firing events. The fuel module supplies a rich fuel-air charge to the cylinder for the M consecutive cylinder firing events. According to the system, R is a real number greater than zero, N and M are integers greater than zero, and the spark limit is a control value used to limit an amount of spark advance to prevent spark-knock. A method for controlling an engine is also provided.

主权项

1. A control system for an engine, comprising:
an initiation module that selectively initiates a stochastic pre-ignition (SPI) process to induce SPI and that generates a request signal indicating initiation of the SPI process to induce SPI; a spark module that, in response to receiving the request signal indicating the initiation of the SPI process to induce SPI, advances spark timing of a cylinder R degrees past a spark limit for N consecutive cylinder firing events, and retards spark timing of said cylinder past said spark limit for M consecutive cylinder firing events after said N consecutive cylinder firing events; and a fuel module that supplies, in response to receiving the request signal indicating the initiation of the SPI process to induce SRI, a rich fuel-air charge to said cylinder for said M consecutive cylinder firing events, wherein R is a real number greater than zero, N and M are integers greater than zero, and said spark limit is a control value used to limit an amount of spark advance to prevent spark-knock.