System and method for preventing stochastic pre-ignition
View Patent ↗A system according to the principles of the present disclosure includes a stochastic pre-ignition module and a fuel control module. The stochastic pre-ignition module determines whether operating conditions of an engine satisfy predetermined criteria associated with stochastic pre-ignition. The fuel control module enriches an air/fuel ratio of the engine when the engine operating conditions satisfy the predetermined criteria.
1. A system comprising:
a stochastic pre-ignition module that determines whether an operating condition of an engine satisfies predetermined criteria associated with stochastic pre-ignition, wherein the engine operating condition includes at least one of a speed of the engine and a load on the engine, and wherein the engine operating condition satisfies the predetermined criteria when at least one of:
the engine speed is greater than a first speed; and
the engine load is greater than a first load; and
a fuel control module that enriches an air/fuel ratio of the engine when the engine operating condition satisfy the predetermined criteria.
2. The system of claim 1 wherein the fuel control module enriches the air/fuel ratio of the engine when the engine operating condition satisfies the predetermined criteria for a first period.
3. The system of claim 1 wherein the engine operating condition includes the engine speed.
4. The system of claim 1 wherein the engine operating condition includes the engine load.
5. The system of claim 4 wherein the engine load is greater than the first load when a pressure within an intake manifold of the engine is greater than a first pressure.
6. The system of claim 1 wherein the fuel control module adjusts the air/fuel ratio to a first air/fuel ratio within a range between 10 to 1 and 12 to 1when the engine operating condition satisfies the predetermined criteria.
7. The system of claim 1 wherein the fuel control module executes N fuel injection pulses for each combustion event in the engine when the engine operating condition satisfies the predetermined criteria, wherein N is an integer greater than one.
8. The system of claim 1 wherein the fuel control module advances fuel injection timing in the engine when the engine operating condition satisfies the predetermined criteria.
9. The system of claim 8 wherein the fuel control module advances the fuel injection timing by an amount corresponding to an amount of crankshaft rotation in the engine that is between 40 degrees and 50 degrees.
10. The system of claim 1 wherein:
the stochastic pre-ignition module determines that the engine operating condition satisfies the predetermined criteria when the engine speed and the engine load are within predetermined ranges; and
the fuel control module executes N fuel injection pulses for each combustion event in the engine and advances fuel injection timing in the engine when the engine operating condition satisfies the predetermined criteria, wherein N is an integer greater than one.
11. A method comprising:
determining whether an operating condition of an engine satisfy predetermined criteria associated with stochastic pre-ignition, wherein the engine operating condition includes at least one of a speed of the engine and a load on the engine, and wherein the engine operating condition satisfies the predetermined criteria when at least one of:
the engine speed is greater than a first speed; and
the engine load is greater than a first load; and
enriching an air/fuel ratio of the engine when the engine operating condition satisfy the predetermined criteria.
12. The method of claim 11 further comprising enriching the air/fuel ratio of the engine when the engine operating condition satisfies the predetermined criteria for a first period.
13. The method of claim 12 wherein the engine operating condition includes the engine speed.
14. The method of claim 13 wherein the engine operating condition includes the engine load.
15. The method of claim 14 wherein the engine load is greater than the first load when a pressure within an intake manifold of the engine is greater than a first pressure.
16. The method of claim 11 further comprising adjusting the air/fuel ratio to a first air/fuel ratio within a range between 10 to 1 and 12 to 1 when the engine operating condition satisfies the predetermined criteria.
17. The method of claim 11 further comprising executing N fuel injection pulses for each combustion event in the engine when the engine operating condition satisfies the predetermined criteria, wherein N is an integer greater than one.
18. The method of claim 11 further comprising advancing fuel injection timing in the engine when the engine operating condition satisfies the predetermined criteria.
19. The method of claim 18 further comprising advancing the fuel injection timing by an amount corresponding to an amount of crankshaft rotation in the engine that is between 40 degrees and 50 degrees.
20. The method of claim 11 further comprising:
determining that the engine operating condition satisfies the predetermined criteria when the engine speed the engine load are within predetermined ranges; and
executing N fuel injection pulses for each combustion event in the engine and advances fuel injection timing in the engine when the engine operating condition satisfies the predetermined criteria, wherein N is an integer greater than one.