Measuring and testing – Vehicle chassis – Steering
Reexamination Certificate
1999-08-11
2001-11-13
Dombroske, George (Department: 2855)
Measuring and testing
Vehicle chassis
Steering
C073S115060, C073S116070, C324S402000
Reexamination Certificate
active
06314803
ABSTRACT:
The present invention relates to a method for surveying the operating conditions of an internal combustion engine with spark ignition.
More precisely, the invention is directed to a method for monitoring the compression and ignition thermodynamic cycle in the combustion chamber of an internal combustion engine having an ignition system including an ignition coil whose secondary winding is connected to an electric actuator, typically constituted by a spark plug, adapted to transform an impulse of electric energy into a spark which produces the ignition of the combustion mixture.
Modern electronic control units of internal combustion engines can influence a great number of engine operating parameters for optimising the global behaviour of the engine in terms of power output, reduction of fuel consumption, reduction of pollution, etc. For a correct operation, an electronic control unit must receive precise and reliable information on the engine operating conditions. The pressure in combustion chamber is one of the parameter whose monitoring is most difficult. By monitoring the pressure into the combustion chamber it is possible to obtain important information which permit for instance to determine the presence of anomalous combustion conditions (misfire, knocking, etc.). It is known that internal combustion engines have an optimum efficiency in conditions of incipient knocking. An accurate control of the pressure cycle would permit to get progressively closer to operating condition of incipient knocking without ever reaching conditions of actual knocking.
Known systems for surveying the pressure cycle in the combustion chamber are generally based on the use of one or more pressure sensors. A system based on the direct measure of the pressure in the combustion chamber can be used in a laboratory during experimental tests for calibration of engines but, for reasons of costs, can not be used on engines for series produced motor-vehicles.
The present invention has the object to provide a method for carrying out an accurate diagnosis of the engine operating conditions, with particular respect to the variation of the pressure during the compression and ignition cycle, without using sensors specifically intended for this use.
According to the present invention this object is achieved by a method having the features forming the subject of the main claim.
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Pennese Michele
Rossi Daniele
Dombroske George
Magneti Marelli SpA
Reising Ethington, Barnes, Kisselle, Learman & McCulloch, P.C.
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