Cummins Engine Company, Inc.

Cummins Inc.

David A Bolis

Ward R Edwards, Ii

George L Muntean

Michael J Ruth

Stephen M Holl

Daniel D Wilhelm

Gary L Gant

C Edward Morris, Jr

Gary Charles Salemme

Gregory A Weber

David E Shultz

John L Hoehne

Kevin L Vogt

David A Olson

James Hugh Ross

Jeffrey P Seger

Keith L Musser

William A Monette

Lawrence H Becker

Prakash Bedapudi

George E Crane

Budhadeb Mahakul

Alan R Ford

John R Mills

In one embodiment, a system for determining maximum available engine output torque includes an engine speed sensor and a control computer produce a fueling command for fueling an internal combustion engine. The computer is configured to produce a maximum available engine output torque value as a function of the engine speed signal and the fueling command. In an alternate embodiment, the system includes a control computer configured to produce the maximum available engine output torque value as a function of engine speed, at least one engine intake parameter associated an intake manifold coupled to the engine, and an engine exhaust parameter associated with an exhaust gas structure coupled to the engine. In either case, an application control strategy is responsive to the maximum available engine torque value to control an engine-driven accessory as a function thereof.

System and method for determining maximum available engine torque

An engine control system for optimizing a tradeoff between turbocharger lag and production of exhaust emissions including altitude and intake manifold air temperature compensation includes a turbocharger boost sensor, an engine speed sensor, an ambient pressure sensor and an intake manifold air temperature sensor, each providing appropriate sensor signals to a control computer. The control computer is operable to limit fueling signals supplied to the engine fuel system based on turbocharger boost, engine speed, ambient pressure and intake manifold air temperature to thereby optimize a tradeoff between turbocharger lag and production of black smoke and other exhaust emissions while compensating for changes in altitude and intake manifold air temperature. In one preferred embodiment, the control computer includes a fueling table stored therein which maps boost pressure and engine speed values to appropriate fueling values, an altitude correction table stored therein which maps boost pressure and ambient pressure to appropriate fueling correction values and an intake air temperature correction table store therein which maps intake manifold air temperature values to appropriate intake air temperature correction values. The control computer is operable to limit the fueling signals based on the fueling values from the fueling table, the fueling correction values from the altitude correction table and the fueling correction values from the intake air temperature correction table, to thereby maintain a desired tradeoff between turbocharger lag and production of black smoke and other exhaust emissions while compensating for changes in ambient pressure and intake manifold air temperature.

Engine control system for minimizing turbocharger lag including altitude and intake manifold air temperature compensation

A piston for reciprocal movement within a combustion chamber (4) of a compression ignition engine (2) having a fuel injector (20) for forming a fuel injection plume (40) having a relatively deep angle (7.degree. to 40.degree. from a plane perpendicular to the central axis of the combustion chamber) and a piston (8) having a centrally located symmetrical upwardly opening cavity for forming a combustion bowl (30) especially arranged to complement the plume in a manner to maintain very low entrainment of soot in the lubrication oil of the engine and to maintain other engine emissions, e.g., CO and smoke, within acceptable ranges suitable to meet TALuft standards. In particular, the combustion bowl (30) as formed by an upwardly opening cavity formed as a surface of revolution having a centrally raised floor section (42) with relatively large radius of curvature R.sup.1 and an upwardly flared outer bowl section 48 having relatively smaller radius of curvatures R.sub.2. The ratio of R.sub.2 divided by R.sub.1 is greater than 0.14 and less than or equal to 0.32. Other important dimensional relationships would apply.

Deep angle injection nozzle and piston having complementary combustion

A system for controlling fuel flow in an internal combustion engine receives a command specifying a desired fuel flow rate from an electronic control module. The system generates a feedforward estimate of actuator current required to produce the desired flow rate. This estimate is combined with a fueling current offset value generated using a proportional-integral feedback controller. A differential pressure between the fuel rail and cylinder gas is converted, by surface interpolation based on a lookup table, to an estimate of actual fuel flow rate. The difference between this actual fuel flow rate and the desired flow rate is provided to the feedback controller as an error signal. The feedback controller preferably uses different gain values depending on an operating mode of the engine (speed control and torque control modes).

Apparatus and method for accurately controlling fuel injection flow rate

A unit fuel injector is disclosed to be used in a fuel injection system of an internal combustion engine wherein each unit injector is operated independently from one another and in synchronization with the internal combustion engine. Specifically, the unit injector in accordance with the present invention includes a reciprocating plunger assembly within the unit injector that controls fuel metering as well as fuel injection, and a valve device positioned between a minor diameter plunger section and a cup of the unit injector so as to permit fuel flow in one direction for fuel injection and to restrict flow of gases in the opposite direction. The valve device effectively reduces carbon build-up on the injector surfaces and increases injector longevity while reducing maintenance. Moreover, fuel metering is accurately controlled without substantial carboning flow losses.

Unit fuel injector with plunger minor diameter floating sleeve

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Nashville, IN, United States of America

David A Bolis