# US 9,518,525 B2 · System and method of controlling fuel injection pressure in an engine having an in-cylinder pressure sensor

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- Number: US 9,518,525 B2
- Document ID: US9518525B2
- Status: Granted
- Kind: B2
- Application number: 14/407,341
- Filed: 2012-06-11
- Published: 2015-05-07
- Granted: 2016-12-13
- Earliest claimed: 2012-06-11
- Assignees: International Engine Intellectual Property Company, LLC
- Applicants: Russell P. Zukouski
- Inventors: Russell P. Zukouski
- Web page: https://patentgrep.com/patent/US9518525B2

## CPC

- F02D 41/30: Controlling fuel injection {(F02D41/182, F02D41/24 take precedence)}
- F02D 15/04: by alteration of volume of compression space without changing piston stroke
- F02D 35/023: {by determining the cylinder pressure}
- F02D 41/0002: {Controlling intake air}
- F02D 41/14: Introducing closed-loop corrections
- F02D 41/3836: {Controlling the fuel pressure}
- F02D 41/1454: {the characteristics being an oxygen content or concentration or the air-fuel ratio}
- F02D 2200/0602: Fuel pressure
- F02D 2250/31: Control of the fuel pressure
- F02D 2250/36: Control for minimising NOx emissions
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)

## Abstract

A method of operating an internal combustion engine is provided. An in-cylinder pressure within a cylinder of the engine is determined. A fuel injection pressure from a fuel injector disposed within the cylinder is determined. A ratio of the in-cylinder pressure within the cylinder and the fuel injection pressure is compared to a stored threshold value. The fuel injection pressure is adjusted based upon the comparison of the ratio of the in-cylinder pressure within the cylinder and the fuel injection pressure to the stored threshold value.

## Claims

### Claim 1

A method of operating an internal combustion engine having a plurality of cylinders, comprising:
providing a pressure sensor within a cylinder of the engine for generating a signal representative of the pressure within the cylinder in which the pressure sensor is disposed;
providing a fuel injector in communication with the cylinder having variable injection pressure capability;
determining a fuel injection pressure of a fuel injector disposed within the cylinder and generating a signal representative of the fuel injection pressure;
a fuel injector controller operatively connected with the pressure sensor and fuel injector for receiving the signals from the pressure sensor representative of the pressure within the cylinder and for receiving the signals representative of the fuel injection pressure:
the fuel injector controller configured to perform a calculation of the ratio of the in-cylinder pressure signals and the fuel injection pressure signals;
providing a database of stored threshold values of the ratio of the in-cylinder pressure signals to fuel injection pressure signals;
the fuel injection controller also configured to operate the injector to inject fuel into the cylinder at a predetermined fuel injection pressure based on a stored threshold value;
the fuel injection controller also configured to compare the ratio of the in-cylinder pressure and the fuel injection pressure; and
the fuel injector controller adjusting the fuel injection pressure based upon the comparison of the ratio of the in-cylinder pressure within the cylinder and the fuel injection pressure to the stored threshold value.