Gm Global Technolgoy Operations, Inc.

C.r.f. Societa Consortile Per Azioni

Massimiliano Maira

Nando Vennettilli

Christopher E Whitney

Michael Livshiz

Krishnendu Kar

Morena Bruno

Luca Scavone

Francesco Richard

Nando Vennettili

A control system includes an engine speed control module, a fuel control module, and an air control module. The engine speed control module controls an actual speed of an engine based a desired power to be generated by combustion in the engine, wherein the desired power is a product of a desired speed of the engine and a desired torque output of the engine. When operating in a fuel lead mode, the fuel control module controls fuel flow in the engine by adjusting a desired fuel mass for each activated cylinder of the engine based on the desired power. The air control module controls air flow in the engine based on an actual air/fuel ratio of the engine resulting from the desired fuel mass.

Power-based engine speed control

A method and system are provided for controlling a throttle valve and an EGR valve in internal combustion engine. The method includes, the steps of measuring an actual fresh mass air flow value entering the engine, determining an exhaust oxygen concentration set point indicative of the oxygen concentration in the exhaust manifold, calculating an air reference value as a function of the exhaust oxygen concentration set point ([O]) and determining an oxygen concentration feedback value representative of the oxygen concentration in the engine. The method further includes, but is not limited to the steps of obtaining a position information for the throttle valve by comparing the actual fresh mass air flow value and air reference value and obtaining a position information for the EGR valve by comparing the oxygen concentration feedback value and oxygen concentration set point. The method also includes the steps of controlling the throttle valve and the EGR valve according to the position information.

Method for controlling the EGR and the throttle valves in an internal combustion engine

A method for detecting faults in an air system of an internal combustion engine having an intake manifold and an exhaust manifold includes, but is not limited to the steps of measuring an oxygen concentration of the gas flowing in the exhaust manifold, estimating an intake oxygen control value in the intake manifold and estimating an intake oxygen reference value in the intake manifold based on said oxygen concentration of the gas flowing in the exhaust manifold. The method further includes, but is not limited to the steps of calculating an intake deviation value as a difference between the intake oxygen control value and the intake oxygen reference value and verifying if the intake deviation value is greater than a predetermined first threshold.

Method for detecting faults in the air system of internal combustion engines

A method for estimating the oxygen concentration in an internal combustion engine that includes, but is not limited to an intake manifold, an exhaust manifold, an EGR system, a throttle valve, an air mass sensor for measuring a fresh air flow ({dot over (m)}) entering the intake manifold through the throttle valve, and cylinders. The method includes, but is not limited to the steps of estimating the total gas flow ({dot over (m)}) entering the cylinders, calculating the EGR gas flow ({dot over (m)}), calculating the air fraction (f) of the gas flowing in the exhaust manifold, calculating the air mass (m) entering the cylinders based on the air fraction (f) in the exhaust manifold, on the total gas flow ({dot over (m)}) entering the cylinders, on the EGR gas flow ({dot over (m)}) and on the fresh air flow ({dot over (m)}), calculating the total mass (m) in the intake manifold based on the fresh air flow ({dot over (m)}), on the EGR gas flow ({dot over (m)}) and on the total gas flow ({dot over (m)}) entering the cylinders, calculating the air fraction (f) in the intake manifold based on the air mass (m) entering the cylinders and the total mass (m) in the intake manifold, and calculating the oxygen mass concentration ([O]) in the intake manifold based on the air fraction (f) in the intake manifold.

Method for estimating the oxygen concentration in internal combustion engines

In a multi-cylinder internal combustion engine, equipped with an electronically controlled hydraulic system for the variable operation of the engine's inlet valves, an indicator of the differences in the amount of air aspirated by the cylinders of the engine during the respective induction phase is provided and said system controls the various inlet valves of the engine in a differentiated manner, varying the time and/or opening travel for the purpose of minimizing the differences between the amounts of air aspirated by the various cylinders of the engine.

Growing community of inventors

Turin, Italy

Massimiliano Maira