Electronic engine control system
AssigneeDaimlerChrysler AG
InventorsLino Guzella, Charles Robert Koch, Matthias Scherer
Life of this patent
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Abstract
An electronic engine control system for an internal-combustion engine has a computer with programs stored therein and interacts with a sensor system to determine a residual gas fraction in a combustion space of the engine. The engine control system generates a signal value, which correlates with the current residual gas fraction, from a signal value which is generated by the engine control system and which correlates with a current air/fuel mass ratio of a carbureted fuel fed to the combustion space, and from a signal value which is sensed by the sensor system and which correlates with a current air/fuel mass ratio of an exhaust gas discharged from the combustion space after the combustion.
Claims18
An electronic engine control system for an internal-combustion engine which has a computer and a memory with programs filed therein which interact with a sensor system,
- based on a signal value which is generated by the engine control system and which represents an actual current air/fuel mass ratio of a carbureted fuel fed to a combustion space of the engine, and on a signal value sensed by the sensor system which correlates with a current air/fuel mass ratio of an exhaust gas discharged from the combustion space of the engine after a combustion, the engine control system generates a signal value which represents a current exhaust gas mass fraction which together with the carbureted fuel fed to the combustion space, forms a content of the combustion space after a feeding of carbureted fuel and prior to a combustion.
A method of controlling operation of an internal combustion engine having a computer, and a memory and a sensor system associated with the computer, said method comprising:
- said computer determining existence of a substantially steady state operation of said engine, based on signals from said sensor arrangement;
- and
- during existence of a substantially steady state operation of said engine, based on a signal generated by said computer which represents an actual current air/fuel ratio of a mixture input to a combustion chamber of said engine, and on a signal received from the sensor system representing a current air/fuel ratio of an exhaust gas discharged from said combustion chamber, said computer generating a signal which represents a current exhaust gas mass fraction;
- and
- recirculating and mixing a portion of said exhaust gas with said mixture input to said combustion chamber, as a function of said signal which represents a current exhaust gas mass fraction.
An electronic engine control system for an internal combustion engine having a computer, a plurality of sensors for measuring operating parameters of the engine, and a memory encoded with a program which includes steps for:
- said computer determining existence of a substantially steady state operation of said engine, based on signals from said sensor arrangement;
- and
- during existence of a substantially steady state operation of said engine, based on a signal generated by said computer which represents an actual current air/fuel ratio of a mixture input to a combustion chamber of said engine, and on a signal received from the sensor system representing a current air/fuel ratio of an exhaust gas discharged from said combustion chamber, said computer generating a signal which represents a current exhaust gas mass fraction;
- and
- said computer causing a recirculating and mixing a portion of said exhaust gas with said mixture input to said combustion chamber, as a function of said signal which represents a current exhaust gas mass fraction.
A method for controlling operation of an internal combustion engine having a computer, and a memory and a sensor system associated with the computer, said method comprising:
- said computer determining a first signal value which represents an actual current air/fuel ratio of a fuel mixture fed to a combustion space of said engine, based on signals from sensors in said sensor system;
- said computer receiving a second signal value sensed by said sensor system, which second signal is indicative of a current air/fuel mass ratio of an exhaust gas discharged from the combustion space of the engine after a combustion;
- based on said first and second signal values, said computer generating a signal indicative of a current exhaust gas mass fraction which, together with said fuel mixture fed to said combustion space, forms a content of the combustion space prior to a combustion;
- and
- recirculating and mixing a portion of said exhaust gas with said mixture input to said combustion chamber, as a function of said signal which represents a current exhaust gas mass fraction.
Dependencies are inferred from the claim text.