Gm Global Technolgoy Operations, Inc.

Chao F Daniels

Wenbo Wang

Jeffrey M Kaiser

Gary Robert Cygan, Jr

Ronald J Herrin

Jason R Bartak

Tang-Wei Kuo

Layne K Wiggins

Tameem K Assaf

Xiaofeng Yang

Xu Han

Shanshan L Peer

Kristopher J Healey

An engine control system includes: a normalization module configured to normalize, to within a predetermined range of values, a spark timing of an engine and at least one other parameter of the engine, thereby producing a normalized spark timing and at least one normalized other parameter, respectively; a processing module configured to generate a sigmoidal spark timing by applying, to the normalized spark timing, one of (a) a sigmoidal function and a sinusoidal function; and an estimation module configured to estimate a torque output of the engine based on the normalized spark timing and the at least one normalized other parameter using a mathematical model.

Engine torque estimation and control systems and methods

An engine control system of a vehicle includes an estimation module and an actuator module. The estimation module estimates a crankshaft angle where 50 percent of a mass of fuel is burned during a combustion event based on: a combustion speed when a crankshaft of an engine is at a predetermined position during the combustion event; an engine speed; a mass of air per cylinder (APC); a spark timing; and a predetermined spark timing. The actuator module controls an engine actuator based on the crankshaft angle where 50 percent of the mass of fuel is burned during the combustion event.

Fifty percent burn crankshaft angle estimation systems and methods

A system according to the principles of the present disclosure includes a first burn duration module and a spark control module. The first burn duration module determines a first duration of at least a portion of a fuel burn within a cylinder of an engine from a first time when a first predetermined percentage of a mass of fuel within the cylinder is burned to a second time when a second predetermined percentage of the fuel mass is burned. The spark control module controls a spark plug to adjust spark timing of the cylinder based on the first burn duration.

System and method for controlling spark timing based on a duration of a fuel burn within a cylinder in an engine

A parameter determination system includes first and second difference modules, a ratio module, and an M index module. The first difference module determines a first crankshaft angle of a combustion event of an engine, determines a second crankshaft angle of the combustion event of the engine, and determines a first difference between the first and second crankshaft angles. The second difference module determines a third crankshaft angle of the combustion event of the engine, determines a fourth crankshaft angle of the combustion event of the engine, and determines a second difference between the third and fourth crankshaft angles. The ratio module determines a ratio of the first difference to the second difference. The M index module determines an M index value for the Wiebe function based on the ratio and displays the M index value on a display.

M index determination systems and methods for Wiebe functions

A method for operating a spark-ignition internal combustion engine includes controlling spark ignition timing responsive to a combustion charge flame speed corresponding to an engine operating point and a commanded air/fuel ratio associated with an operator torque request.

Method and apparatus for controlling spark timing in an internal combustion engine

A control system and method of controlling operation of an internal combustion engine includes a load determination module that determines an engine load, an equivalence ratio module that determines an equivalence ratio, a correction factor module that generates a correction factor based on the engine load, the equivalence ratio, and the engine speed and an engine operation module that regulates operation of the engine based on the correction factor.

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Superior Township, MI, United States of America

Chao F Daniels