Cummins Inc.

Cummins Ip, Inc.

Cummins Intellectual Property, Inc.

Dhanesh Purekar

Paul A Hayes

Zlatko Ordanic

Matt Reeves

A method is provided for controlling operation of a fueling system including a fuel pump driven by an engine geartrain and a fuel accumulator supplied fuel by the fuel pump, comprising: determining whether an operating parameter of the engine is less than a threshold value; responding to the operating parameter being less than the threshold value by causing an inlet valve of the fuel pump to operate in a 100 percent fill mode, whereby a pumping chamber in the fuel pump is approximately fully filled for at least one pumping cycle; determining whether a fuel pressure in the fuel accumulator is greater than a desired value while the inlet valve is in the 100 percent fill mode; and responding to the fuel pressure being greater than the desired value by activating an outlet valve of the fuel accumulator to drain fuel in the fuel accumulator to a fuel tank.

Dual rail pressure control for engine noise improvement

An oil pressure regulator includes a chamber that extends between an oil supply line and an oil bypass line. The chamber extends from a closed end of the chamber to an open end of the chamber. The regulator includes a plunger that is positioned within the chamber. The plunger is movable within the chamber between a first position preventing oil flow from the oil supply line to the oil bypass line, and a second position allowing oil flow from the oil supply line to the oil bypass line. Also, the regulator includes a compression spring that is positioned within the chamber between the plunger and the closed end. When the plunger is in the first position, the compression spring is in an uncompressed state, and when the plunger is in the second position, the compression spring is in a compressed state.

Oil pressure regulator

This disclosure provides crankshaft damper and tone wheel assembly having a low noise characteristic. The crankshaft damper and tone wheel assembly can provides both damping of vibrations excited in a crankshaft of an internal combustion engine and an indication of the rotational speed or position of the crankshaft. The crankshaft damper including a hub portion and a ring-shaped portion connected to the hub portion by plural spokes, and the ring-shaped portion has an inner circumference that surrounds an area including the hub portion and the plural spokes. The tone wheel includes an annular-shaped portion connected to the crankshaft damper and having an inner diameter, an outer diameter, plural teeth arranged at an equal pitch along the outer diameter, and a same rotational axis as the crankshaft damper. To reduce transmitting noise of vibrations excited in the crankshaft, the annular-shaped portion does not overlap a substantial amount of the area defined by the inner circumference of the ring-shaped portion when viewed along a direction of the rotational axis.

Crankshaft damper and tone wheel assembly having noise reducing configuration

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.

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Columbus, IN, United States of America

Dhanesh Purekar