Method for evaluating the march of pressure in a combustion chamber
First Claim
1. A method for evaluating a combustion chamber pressure in an internal combustion engine having at least one cylinder pressure sensor, which measures a cylinder pressure, and one crankshaft angle sensor, which outputs a signal representative of a crankshaft position, and one evaluation device, including at least one microprocessor, to which signals of the sensors are supplied, in which the microprocessor, from a course of the combustion chamber pressure as a function of the crankshaft angle position, concludes that at least one of valve control times “
- outlet opens”
, “
outlet closes”
, “
inlet opens”
, “
inlet closes”
exists with respect to the crankshaft angle position, characterized in that measurements are performed during normal engine operation, and incident combustion chamber pressure courses or events which depend on the combustion chamber pressure course and which characterize the valve control times are evaluated.
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Abstract
A method for evaluating the combustion chamber pressure in an internal combustion engine is described, in which the output signal of at least one cylinder pressure sensor and one crankshaft angle sensor is performed by the control unit of the engine. By analysis of the course of combustion chamber pressure over the crankshaft angle, characteristic pressure courses are obtained for certain valve control times. From these characteristic pressure courses, a conclusion can be drawn as to the valve control times “outlet opens”, “outlet closes”, “inlet opens”, and “inlet closes”, referred to the crankshaft angle.
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Citations
15 Claims
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1. A method for evaluating a combustion chamber pressure in an internal combustion engine having at least one cylinder pressure sensor, which measures a cylinder pressure, and one crankshaft angle sensor, which outputs a signal representative of a crankshaft position, and one evaluation device, including at least one microprocessor, to which signals of the sensors are supplied, in which the microprocessor, from a course of the combustion chamber pressure as a function of the crankshaft angle position, concludes that at least one of valve control times “
- outlet opens”
, “
outlet closes”
, “
inlet opens”
, “
inlet closes”
exists with respect to the crankshaft angle position, characterized in that measurements are performed during normal engine operation, and incident combustion chamber pressure courses or events which depend on the combustion chamber pressure course and which characterize the valve control times are evaluated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- outlet opens”
Specification