Deere + Company

Southwest Research Institute

Daniel James Podnar

John Thomas Kubesh

Donald Lee McCaw

Gordon J Bartley

Lee Gene Dodge

James J Cole

Jack A Smith

William Lyle Hartman

John Phillip Latusek

A control system controls a turbo-charged trottled engine. The control system includes a throttle between the compressor and the engine, a wastegate communicated with exhaust upstream and downstream from the turbine, and a control unit for controlling the throttle and the wastegate. The control unit generates a desired air mass value per engine stroke as a function of a desired fuel flow amount and a stored compressor surge characteristic, generates a desired manifold air pressure value as a function of the desired air mass value and sensed engine parameters, and controls the throttle so that actual manifold air pressure matches the desired manifold air pressure. The control unit also generates a desired pressure boost value as a function of the desired manifold pressure value and a stored compressor surge characteristic, and controls the wastegate so that an actual boost pressure matches the desired boost pressure.

Control system and method for turbocharged throttled engine

A system and method of controlling an engine includes sensing a concentration of NOx in exhaust gases produced by the engine and generating a sensed NOx value representative thereof, and controlling an engine control set point as a function of the sensed NOx value. The system also calculates a NOx difference value by subtracting a base NOx value from the sensed NOx value, and if an absolute value of the difference value exceeds a threshold, modifying the set point as a function of the NOx difference value. The method also includes sensing engine RPM, sensing engine manifold absolute pressure (MAP), determining the NOx value as a function of sensed engine RPM and MAP.

Engine control to reduce emissions variability

A method of stoichiometrically operating an internal combustion engine. The engine is equipped with a pre-engine catalyst, which produces syngas from natural gas and air. The engine receives the syngas, as well as natural gas, and recirculated exhaust gas. The amount of syngas and the amount of recirculated exhaust gas are maximized for a desired engine efficiency and NO.sub.x emissions level.

Stoichiometric synthesis, exhaust, and natural-gas combustion engine

The system for controlling the fuel/air mixture supplied to a lean burn engine when operating on natural gas, gasoline, hydrogen, alcohol, propane, butane, diesel or any other fuel as desired. As specific humidity of air supplied to the lean burn engine increases, the oxygen concentration of exhaust gas discharged by the engine for a given equivalence ratio will decrease. Closed loop fuel control systems typically attempt to maintain a constant exhaust gas oxygen concentration. Therefore, the decrease in the exhaust gas oxygen concentration resulting from increased specific humidity will often be improperly attributed to an excessive supply of fuel and the control system will incorrectly reduce the amount of fuel supplied to the engine. Also, the minimum fuel/air equivalence ratio for a lean burn engine to avoid misfiring will increase as specific humidity increases. A relative humidity sensor to allow the control system to provide a more enriched fuel/air mixture at high specific humidity levels. The level of specific humidity may be used to compensate an output signal from a universal exhaust gas oxygen sensor for changing oxygen concentrations at a desired equivalence ratio due to variation in specific humidity specific humidity. As a result, the control system will maintain the desired efficiency, low exhaust emissions and power level for the associated lean burn engine regardless of the specific humidity level of intake air supplied to the lean burn engine.

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San Antonio, TX, United States of America

Daniel James Podnar