Control system and method for preventing stochastic pre-ignition in an engine
First Claim
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.
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Accused Products
Abstract
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.
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Citations
20 Claims
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1. A control system for an engine, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for controlling an engine, comprising:
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selectively initiating a stochastic pre-ignition (SPI) process to induce SPI; generating a request signal indicating initiation of the SPI process to induce SPI; in response to the request signal indicating the initiation of the SPI process to induce SPI, advancing spark timing of a cylinder R degrees past a spark limit for N consecutive cylinder firing events and retarding spark timing of said cylinder past said spark limit for M consecutive cylinder firing events after said N consecutive cylinder firing events; and in response to the request signal indicating the initiation of the SPI process to induce SPI, supplying 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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification