Fuel pump timing to reduce noise
First Claim
Patent Images
1. An apparatus comprising:
- a driving mechanism;
an internal combustion engine including an engine piston disposed within an engine working chamber and operatively coupled to the driving mechanism; and
a fuel pump including a pump piston disposed within a fuel pump working chamber and operatively coupled to the driving mechanism;
wherein the engine piston and the fuel pump piston are operatively coupled to the driving mechanism such that a noise profile of the internal combustion engine is below a threshold level when a relationship exists between a configuration of the driving mechanism when the engine piston is at a top dead center position within the engine working chamber and a configuration of the driving mechanism when the fuel pump piston is at a top dead center position within the fuel pump working chamber.
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Abstract
One embodiment is a fuel system for an internal combustion engine including a fuel pump having a fuel pump gear operable to drive the fuel pump to pressurize fuel. The fuel pump gear is offset relative to engine top dead center by a predetermined angle to reduce a sound or noise. The offset can be determined by selecting the minimum sound produced over a range of offsets or operating conditions.
29 Citations
24 Claims
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1. An apparatus comprising:
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a driving mechanism; an internal combustion engine including an engine piston disposed within an engine working chamber and operatively coupled to the driving mechanism; and a fuel pump including a pump piston disposed within a fuel pump working chamber and operatively coupled to the driving mechanism; wherein the engine piston and the fuel pump piston are operatively coupled to the driving mechanism such that a noise profile of the internal combustion engine is below a threshold level when a relationship exists between a configuration of the driving mechanism when the engine piston is at a top dead center position within the engine working chamber and a configuration of the driving mechanism when the fuel pump piston is at a top dead center position within the fuel pump working chamber. - View Dependent Claims (2, 3, 4, 5, 6, 23, 24)
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7. An apparatus, comprising:
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an internal combustion engine including an engine working chamber having a top dead center and a fuel pump working chamber having a top dead center, the internal combustion engine also including a noise profile that incorporates measurements made at a variety of different angular biases between the engine working chamber top dead center and the fuel pump working chamber top dead center; and a crank shaft angular bias between the engine working chamber top dead center and the fuel pump working chamber top dead center, the crank shaft angular bias is based upon the noise profile, wherein the internal combustion engine is a turbocharged, in-line six cylinder engine.
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8. A method comprising:
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positioning a fuel pump gear of a fuel pump to have an angular relationship with a crank shaft; operating an engine system including the fuel pump and the crank shaft; measuring a noise produced by the engine system; and changing the angular relationship of the fuel pump gear and the crank shaft based on the measuring. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A method comprising:
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operating an internal combustion engine having a piston; operating a fuel pump coupled to the internal combustion engine; evaluating a sound indication of the internal combustion engine; and setting a fuel pump timing relative to a top dead center of the internal combustion engine based upon the evaluating. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification