Control arrangement for internal combustion engine
First Claim
1. In an internal combustion engine having a piston operatively connected with a crankshaft and movably disposed in a cylinder to define a combustion chamber, a control system comprising:
- a sensor for sensing the pressure prevailing in said combustion chamber;
a circuit responsive to the output of said sensor, said circuit comprising;
means for arranging the ignition timing so that pressure due to combustion does not occur during the compression stroke;
means for recording the change in pressure in the combustion chamber which occurs with movement of said piston during said compression stroke;
means for using the recorded data to derive the motoring pressure characteristics which occur during the expansion stroke and thus obtain the motoring pressure characteristics for said compression and expansion strokes irrespective of the presence of combustion pressure being produced during said expansion stroke;
means for computing at least one combustion process parameter using said motoring characteristics; and
means for comparing said at least one combustion process parameter with predetermined data for determining the difference therebetween; and
means responsive to said circuit for controlling an engine control parameter in a manner to eliminate said difference.
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Accused Products
Abstract
The present invention features a control system for controlling the combustion process occurring in the combustion chamber of an internal combustion engine, wherein the exact nature of the combustion pressure generation wave form occurring during a compression and subsequent expansion stroke is determined via determining the nature of the motoring pressure wave during the same compression and expansion strokes and discriminating this form from the actual sensed pressure generation characteristics. The system further permits the effect of various operational parameters such as exhaust gas recirculation, ignition timing, air fuel ratio and the like on the combustion process and therefore on the torque output, fuel consumption and noxious emission levels of the engine, to be predicted and compared with predetermined schedules in order to determine the degree to which adjustment of one or more of the above mentioned operational parameters is necessary to bring the engine performance characteristics into agreement with predetermined requirements.
56 Citations
6 Claims
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1. In an internal combustion engine having a piston operatively connected with a crankshaft and movably disposed in a cylinder to define a combustion chamber, a control system comprising:
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a sensor for sensing the pressure prevailing in said combustion chamber; a circuit responsive to the output of said sensor, said circuit comprising; means for arranging the ignition timing so that pressure due to combustion does not occur during the compression stroke; means for recording the change in pressure in the combustion chamber which occurs with movement of said piston during said compression stroke; means for using the recorded data to derive the motoring pressure characteristics which occur during the expansion stroke and thus obtain the motoring pressure characteristics for said compression and expansion strokes irrespective of the presence of combustion pressure being produced during said expansion stroke; means for computing at least one combustion process parameter using said motoring characteristics; and means for comparing said at least one combustion process parameter with predetermined data for determining the difference therebetween; and means responsive to said circuit for controlling an engine control parameter in a manner to eliminate said difference. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification