Methods and system for adjusting cylinder air charge of an engine
a technology of air charge and cylinder, which is applied in the direction of electric control, ignition automatic control, machines/engines, etc., can solve the problem that the spark timing of the cylinder may deviate from the desired spark timing
Active Publication Date: 2019-08-22
FORD GLOBAL TECH LLC
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The patent describes a method for improving engine air-fuel control and starting consistently, by adjusting the cylinder air charge estimate based on the previous engine stop and the actual total number of combustion events. This allows for a more accurate estimation of the air in the cylinder and allows for earlier fuel injection, resulting in improved engine air-fuel control and starting consistently regardless of which cylinder is first to fire after a stop.
Problems solved by technology
Further, spark timing for the cylinder may deviate from desired spark timing due to errors in the cylinder air charge estimate.
Method used
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[0013]The present description is related to adjusting cylinder air charge estimates to improve engine starting and air-fuel ratio control during engine starting. Fuel may be injected to an engine in response to two different cylinder air charge estimates for a cylinder cycle. The fuel may be injected in a first fuel pulse that occurs during an intake stroke of a cylinder. Fuel may also be injected in a second fuel pulse that occurs during a compression stroke of the cylinder. The cylinder air charge may be estimated for an engine of the type shown in FIG. 1. Cylinder charge estimates from prior engine starts may be the basis for changing values of cylinder air charge scalars that are a function of first cylinder to fire since engine stop and an actual total number of combustion events since engine stop. FIGS. 3-5 illustrate a method for operating an engine. A portion of an example engine starting sequence is shown in FIG. 6.
[0014]Referring to FIG. 1, internal combustion engine 10, c...
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Systems and methods for operating an internal combustion engine based on output of an intake manifold pressure sensor and output of an in cylinder pressure sensor are described. The systems and methods provide a way of determining cylinder air charge so that a fuel injector has sufficient time to provide a desired amount of fuel to a cylinder during a cycle of the cylinder.
Description
FIELD[0001]The present description relates to methods and a system for determining air charge amounts of an internal combustion engine that includes direct fuel injectors. The methods and systems may be particularly useful for engines that include an intake manifold pressure sensor and one or more cylinder pressure sensors.BACKGROUND AND SUMMARY[0002]An internal combustion engine may include direct fuel injectors for supplying fuel directly to engine cylinders. The direct fuel injectors may be sized so that they may accurately provide either small or large amounts of fuel to a cylinder during a cycle of the cylinder. However, to provide large amounts of fuel to the cylinder to meet driver demand torque, the direct fuel injectors may have to begin injecting fuel before intake valves of the cylinder close so that a desired amount of fuel may be injected to the cylinder. If intake manifold pressure is sampled long before the cylinder's intake valve closes, the intake manifold pressure ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F02D41/18F02D41/06G01F1/88F02P5/04
CPCF02D41/182F02D41/062G01F1/88F02P5/045F02D2200/0406F02D2200/0414F02D2200/0404F02D11/106F02D35/023F02D37/02F02D41/30F02D13/06F02D41/009F02D41/042F02D41/402F02D2041/0092F02D2041/0095F02D2041/389F02D2200/0402F02P5/1506F02P5/1512Y02T10/40
Inventor SURNILLA, GOPICHANDRAGLUGLA, CHRISTOPHERHUBERTS, GARLANRANGA, ADITHYA PRAVARUN RE
Owner FORD GLOBAL TECH LLC