Delphi Technologies, Inc.

Gm Global Technolgoy Operations, Inc.

Delphi Technologies IP Limited

James F Sinnamon

Mark C Sellnau

James Craig Smith

Wayne Richard Moore

Kevin S Hoyer

Robert J Ewalds

A GDCI engine recirculates exhaust gases to a combustion chamber using desired early injection parameters for a steady state engine operation from a controller. An engine control system detects a load increase relative to the steady state engine operation, and insufficient recirculated exhaust gases to the combustion chamber are delivered in response to the detected load increase as a result of transport delays. A last fuel injection into the combustion chamber during an engine cycle with multiple fuel injections is delayed as compared to the steady state engine operation. Combustion phasing within the combustion chamber is retarded in response to the delayed injection.

GDCI transient EGR error compensation

An estimation apparatus for determining a residual burned gas mass fraction of an internal combustion engine includes a single-cylinder simulator and an optimizer. The residual estimation apparatus does not rely on accurate knowledge of, or calculation of the details of the complex pulsating pressures and flows at the intake and exhaust valves. Instead an iterative approach uses primarily measured cylinder pressure and airflow as driving inputs, to ensure that the simulation states (i.e., pressure, temperature, and composition) of the cylinder gas contents, at the time of intake valve closing, are correct. The burned gas fraction calculated by the engine simulator is then taken as an estimate of that in the actual engine.

System and method for estimating engine internal residual fraction using single-cylinder simulation and measured cylinder pressure

The present invention relates to: self-tuning engine control algorithms using inputs from transducers that measure pressure in the engine cylinders, and from an engine crankshaft rotational position sensor; methods of processing the input signals to 'self-tune' or learn accurate values for a) pressure transducer voltage offset, b) crank position encoder error and c) engine compression ratio; improved pressure-ratio-based algorithms for calculating cylinder heat release fraction as a function of crank angle.

Combustion control in an internal combustion engine

A method for coordinating engine throttle position with camshaft phaser motion during transient engine operation such that desired internal residual dilution is maintained. A dilution model for residual mass fraction and a table of desired dilution values are embedded in the engine control algorithm. The dilution model is applied to calculate the desired throttle and camshaft phaser positions for the next intake event. In a first method, if the throttle is capable of changing the airflow into the engine cylinders faster than the camshaft phasers can respond, the throttle is modulated to maintain desired dilution levels while the phasers are allowed to move as fast as they can. In a second method, if the phaser response faster than the engine intake port airflow response to a throttle position change, the throttle is allowed to move as fast as it can while phaser motion is modulated to maintain desired dilution levels.

Method for control of dilution in engines during variable camshaft phasing

A method for early intake valve closing in an internal combustion engine having a crankshaft and at least one exhaust valve, the crankshaft having a top dead center position and a bottom dead center position, includes the step of determining engine operating load conditions and parameters. One of a plurality of predetermined valve lift profiles, each of which correspond to a respective range of engine operating load conditions and parameters, is selected dependent at least in part upon the engine operating load conditions and parameters. The engine is commanded to operate the engine intake valves according to the selected one of the plurality of predetermined valve lift profiles to thereby optimize fuel economy and reduce emissions at light to moderate engine loads, to improve torque and power at relatively full engine loads, and improve cold start engine operation under cold start engine conditions.

Apparatus and method for early intake valve closing

An improved position control for a solenoid actuated valve, wherein the solenoid is activated based on the combination of a feed-forward component based on a model of the steady state operation of the valve and a closed-loop feedback component that responds to changes in the commanded position and compensates for any inaccuracy in the steady state model. The method involves a valve characterization procedure in which the actual force generated by the solenoid is measured for various combinations of valve position and solenoid current, resulting in a table of coil current in terms of developed force and valve position. In operation, the model is used to estimate the solenoid force required to achieve the commanded valve position under steady state operating conditions, and a controller addresses the table to obtain a feed-forward coil current command as a function of the commanded valve position and the estimated solenoid force. The feed-forward command is combined with a closed-loop feedback coil current command, which in turn, is used to develop a corresponding PWM duty cycle, given the solenoid temperature and the magnitude of the supply voltage.

Model-based position control for a solenoid actuated valve

An exhaust gas recirculation valve control strategy comprised of learning and continuously updating system operating conditions that affect EGR valve control response, and controlling the EGR valve in response to the learned operating conditions for precise, robust EGR valve control. An adaptive base control signal is learned during an engine operating state where no EGR valve movement is needed, such as during engine idle. The base control signal is then continuously applied to the EGR valve, maintaining the valve at an energized level just below the beginning of valve opening. When a desired degree of opening is determined, the change in control signal is made in reference to the base control signal, reducing the magnitude of the resulting control signal change and control gains necessary to initiate valve movement, enabling faster and more stable EGR control. The base control signal is then periodically adjusted in response to fluctuations in predetermined engine parameters, such as system voltage, manifold air pressure, and EGR operating temperature.

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Birmingham, MI, United States of America

James F Sinnamon