Lubricity estimation device and fuel supply control device
AssigneeDenso Corporation
InventorsAtsunori Okabayashi, Shinya Hoshi
Life of this patent
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Abstract
A lubricity estimation device is applied to a fuel supply system that supplies a fuel to an internal combustion engine, and includes a mixing ratio estimation unit and a lubrication index calculation unit. The mixing ratio estimation unit estimates the mixing ratio of each of plural types of molecular structures included in the fuel. The lubrication index calculation unit calculates a lubrication index, representing the lubricity of an outer peripheral portion S1 of the piston of a fuel pump and an outer peripheral portion of the valve body of a fuel injection valve by the fuel, based on the mixing ratio estimated by the mixing ratio estimation unit.
Claims23
A lubricity estimation device that is applied to a fuel supply system for supplying a fuel to an internal combustion engine, the lubricity estimation device comprising:
- a controller including a computer processor for executing instructions such that the controller is at least configured to
- estimate a mixing ratio of each of plural types of molecular structures contained in the fuel, which is to be supplied to the internal combustion engine;
- calculate a lubrication index, representing lubricity provided to a sliding portion of the fuel supply system by the fuel, based on the estimate of the mixing ratio;
- and
- generate a signal corresponding to the lubrication index to control the fuel supply system.
A fuel supply control device that controls operation of a fuel supply system having a fuel injection valve that injects a fuel to be burned in an internal combustion engine and a fuel pump that pumps the fuel to the fuel injection valve, the fuel supply control device comprising:
- a controller including a computer processor for executing instructions such that the controller is at least configured to
- estimate a mixing ratio of each of plural types of molecular structures contained in the fuel, which is to be supplied to the internal combustion engine;
- calculate a lubrication index, representing lubricity provided to a sliding portion of the fuel supply system by the fuel, based on the estimate of the mixing ratio;
- and
- control the operation of the fuel supply system to reduce the workload of the fuel pump to protect the sliding portion when the lubricity becomes low as indicated by the lubrication index exceeding a predetermined threshold value.
Dependencies are inferred from the claim text.