Process and device for measuring the variation in internal pressure in the cylinder of a piston engine
First Claim
1. A method of determining the course of a varying internal pressure in a cylinder of a piston engine, in particular a combustion engine of the piston type, comprising the steps of measuring with a first measurement sensor an acceleration, velocity or displacement signal (x(t)), the first measurement sensor being arranged on the outside of the cylinder such that the signal (x(t)) produced by it represents the acceleration, the velocity or the displacement of one or more points on the outside of the cylinder;
- determining initially and only once, a transfer function (H(ω
)) which represents the relationship of the acceleration, velocity or displacement signal (x(t)) to the internal pressure; and
deriving an output signal representing the course of the varying internal pressure in a cylinder of the piston engine thereafter merely from the acceleration, velocity or displacement signal (x(t)) determined by the first measurement sensor arranged on the outside of the cylinder and from the once determined transfer function (H(ω
)) for the piston engine.
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Accused Products
Abstract
In order to determine the course of a varying internal pressure in the cylinder of a piston-type internal combustion engine using measurement sensors which are in interaction with the outside of the cylinder; an acceleration, velocity or displacement signal (X(t)) is produced and a transfer function (H(ω)) between the internal pressure (Y(t)) and the acceleration, velocity or displacement signal (X(t)) is determined once and thereafter an output signal representing the internal pressure is derived only from the acceleration, velocity or displacement signal X(t)) and the transfer function.
39 Citations
18 Claims
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1. A method of determining the course of a varying internal pressure in a cylinder of a piston engine, in particular a combustion engine of the piston type, comprising the steps of measuring with a first measurement sensor an acceleration, velocity or displacement signal (x(t)), the first measurement sensor being arranged on the outside of the cylinder such that the signal (x(t)) produced by it represents the acceleration, the velocity or the displacement of one or more points on the outside of the cylinder;
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determining initially and only once, a transfer function (H(ω
)) which represents the relationship of the acceleration, velocity or displacement signal (x(t)) to the internal pressure; andderiving an output signal representing the course of the varying internal pressure in a cylinder of the piston engine thereafter merely from the acceleration, velocity or displacement signal (x(t)) determined by the first measurement sensor arranged on the outside of the cylinder and from the once determined transfer function (H(ω
)) for the piston engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A device for determining the course of a varying internal pressure in a cylinder of a piston engine, in particular a combustion engine of the piston type, comprising:
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a first measurement sensor arranged on the outside of the cylinder of the piston engine, so that an acceleration, velocity or displacement signal (x(t)) is produced representing the acceleration, the velocity or the displacement of one or more points on the outside of the cylinder, a second measurement sensor for obtaining an internal pressure signal (y(t)) by direct measurement of the internal pressure, first and second transformation circuits for transforming the acceleration, velocity or displacement signal (x(t)) and the internal pressure signal (y(t)) from the time domain into the frequency domain, and a combining circuit for determining the transfer function (H(ω
)) from the output signals of the transformation circuits and a memory for storing the transfer function (H(ω
)). - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification