Fuel property determination system
AssigneeNissan Motor Co., Ltd.
InventorMotohiro Shinzawa
Life of this patent
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Abstract
A fuel property determination system for an internal combustion engine is comprised of a specific gravity detecting section which detects a specific gravity of fuel used in the engine and a fuel property detecting section which detects at least one of a cetane number, an octane number, an evaporation point, a heat of consumption and an aromatics content as a fuel property, on the basis of the specific gravity.
Claims10
A fuel property determination system for an internal combustion engine, comprising:
- an intake air quantity detecting section which detects an intake air quantity;
- a fuel supply quantity detecting section which detects a fuel supply quantity;
- an actual air/fuel ratio detecting section which detects an actual air/fuel ratio;
- a specific gravity detecting section which obtains a specific gravity of fuel used in the engine on the basis of the intake air quantity, the fuel supply quantity, and the actual air/fuel ratio;
- and
- a fuel property detecting section which detects at least one of a cetane number, an octane number, an evaporation point, a heat of consumption and an aromatics content as a fuel property, on the basis of the specific gravity.
A fuel property determination system for an internal combustion engine, comprising:
- a specific gravity detecting section which detects a specific gravity of fuel used in the engine;
- and
- a fuel property detecting section which detects at least one of a cetane number, an octane number, an evaporation point, a heat of consumption and an aromatics content as a fuel property, on the basis of the specific gravity;
- wherein the specific gravity detecting section executes the detection of the specific gravity only when an exhaust gas recirculation to the engine is stopped.
A fuel property determination system for an internal combustion engine, comprising:
- a specific gravity detecting section which detects a specific gravity of fuel used in the engine;
- a fuel property detecting section which detects at least one of a cetane number, an octane number, an evaporation point, a heat of consumption and an aromatics content as a fuel property, on the basis of the specific gravity;
- and
- a fuel injection quantity detecting section which obtains a fuel injection quantity from a fuel injection period and an injection pressure of a fuel injection apparatus of the engine, a fuel injection weight detecting section which obtains a standard fuel injection weight from the fuel injection quantity, an intake air quantity detecting section which detects an intake air quantity, a standard air/fuel ratio obtaining section which obtains a standard air/fuel ratio from the standard fuel injection weight and the intake air quantity, and an actual air/fuel ratio detecting section which detects an actual air/fuel ratio;
- wherein the specific gravity detecting section obtains an actual specific gravity by comparing the standard air/fuel ratio and the actual air/fuel ratio.
A fuel property determination system for an internal combustion engine, comprising:
- first means for obtaining a fuel injection quantity from a fuel injection period and a injection pressure of a fuel injection apparatus of the engine;
- second means for obtaining a standard fuel injection weight from the fuel injection quantity, a standard fuel specific gravity and a fuel temperature;
- third means for obtaining a standard air/fuel ratio from the standard fuel injection weight and an intake air quantity detected by an airflow meter;
- and
- fourth means for obtaining an actual specific gravity by comparing the standard air/fuel ratio and an actual air/fuel ratio detected by an air/fuel ratio sensor.
A method of determining a property of fuel used in an internal combustion engine, comprising:
- detecting an intake air quantity;
- detecting a fuel supply quantity;
- detecting an actual air/fuel ratio;
- obtaining a specific gravity of fuel used in the engine on the basis of the intake air quantity, the fuel supply quantity, and the actual air/fuel ratio;
- and
- detecting at least one of a cetane number, an octane number, an evaporation point, a heat of consumption and an aromatics content as a fuel property, on the basis of the specific gravity.
A fuel property determination system for an internal combustion engine, comprising:
- intake air quantity detecting means for detecting an intake air quantity;
- fuel supply quantity detecting means for detecting a fuel supply quantity;
- actual air/fuel ratio detecting means for detecting an actual air/fuel ratio;
- specific gravity detecting means for obtaining a specific gravity of fuel used in the engine on the basis of the intake air quantity, the fuel supply quantity, and the actual air/fuel ratio;
- and
- fuel property detecting means for detecting at least one of a cetane number, an octane number, an evaporation point, a heat of consumption and an aromatics content as a fuel property, on the basis of the specific gravity.
Dependencies are inferred from the claim text.