Other

Cummins Inc.

Cummins Engine Company, Inc.

Albert E Sisson

G George Zhu

Martin T Books

Andrew W Osburn

Yue Yun Wang

Dennis O Taylor

Eric K Bradley

Chuan He

Richard E Reisinger

Emma Sweetland

Steven G Smith

A system and method are provided for estimating an instantaneous EGR mass flow rate corresponding to a flow rate of exhaust gas through an exhaust gas recirculation (EGR) conduit fluidly coupled between an exhaust manifold and an intake manifold of an internal combustion engine with an EGR cooler positioned in-line with the EGR conduit. An operating position of the engine is monitored, and the instantaneous EGR mass flow rate is estimated at each of a plurality of fixed increments of the engine position based on EGR cooler outlet temperature, intake manifold pressure and a pressure differential across a flow restriction disposed in-line with the exhaust gas conduit between the EGR cooler and the intake manifold.

System and method for estimating EGR mass flow rates

A system and method for controlling the speed of an engine, or a speed governor, receives an error signal indicative of the difference between the actual engine speed and a commanded engine speed. This error signal is passed through a linear controller that determines a fuel flow rate in units of volume per unit time. The fuel flow rate is a substantially linear function of engine speed, and more specifically engine speed error. The output of the linear controller is fed to a non-linear compensator that determines a fueling command signal as a non-linear function of actual engine speed and fuel flow rate. The speed governor can accurately control engine speeds at low idle conditions. In one embodiment, the non-linear compensator utilizes a three-dimensional table of fueling command values as a function of fuel flow rate and engine speed. In another embodiment, the compensator applies a transfer function utilizing low and high calibration speed values enveloping a low engine speed. In another feature of the invention, a speed sensing system applies a zero order sample and hold to a sensor pulse train to generate a preliminary speed signal. This preliminary speed signal is fed to a software-based first order sample and hold component that calculates an integrated error value, leading to a speed signal value that is substantially free from frequency aliasing.

Engine speed governor having improved low idle speed stability

A system and method for measuring individual cylinder power contribution by cutting out individual cylinders of a multi-cylinder engine and performing a snap-throttle test on the engine. Engine speed versus time data is collected and stored during each snap-throttle test. This data is then used to calculate the power contribution provided by each cylinder using various methods, such as a least squares analysis of the speed data or by an analysis of the kinetic energy of the test engine.

System and method for engine cylinder power diagnosis by cylinder(s)

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Columbus, IN, United States of America

Albert E Sisson