Method and apparatus for engine monitoring
First Claim
1. A method for testing an internal combustion engine, whereby measurements of a rotation angle velocity that is dependent on a crank angle are continuously implemented and dimensional quantities for speed and torque are identified on a basis of an evaluation thereof, wherein an average oscillation amplitude corresponding to the ignition frequency of a total energy level is used as a dimensional quantity for torque, the total energy level is calculated from a momentary rotational angle velocity and from a momentary moment of inertia which are dependent on the crank angle and take into account a kinetic energy of oscillating masses of said engine.
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Abstract
The invention presented herein makes it possible to construct and operate an engine monitoring apparatus that calculates the engine speed, the engine load and/or engine monitoring quantities basically only from the measurement of an angular velocity curve at the gear rim of an internal combustion engine (optionally, from a plurality of angular velocity curves). The basis is thus simultaneously created for monitoring all other measured quantities within narrow limits that are dependent on load and speed. The invention can also be utilized for control purposes or for measuring power.
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Citations
24 Claims
- 1. A method for testing an internal combustion engine, whereby measurements of a rotation angle velocity that is dependent on a crank angle are continuously implemented and dimensional quantities for speed and torque are identified on a basis of an evaluation thereof, wherein an average oscillation amplitude corresponding to the ignition frequency of a total energy level is used as a dimensional quantity for torque, the total energy level is calculated from a momentary rotational angle velocity and from a momentary moment of inertia which are dependent on the crank angle and take into account a kinetic energy of oscillating masses of said engine.
- 9. A method for testing internal combustion engines, whereby measurements of the rotation angle velocity that is dependent on the crank angle are continuously implemented and dimensional quantities for speed and torque are identified on the basis of the evaluation thereof, wherein an average fluctuation amplitude in an energy level curve that is calculated from a curve of the rotational angle velocity at an ignition frequency is utilized as a dimensional quantity for torque, and wherein the average fluctuation amplitude of the energy level curve at the ignition frequency is identified on the basis of an ordering analysis with an FFT algorithm.
- 17. An apparatus for testing internal combustion engines, comprising a measuring means for identifying a rotational angle speed that is dependent on crank angle and comprising an evaluation unit in communication therewith for calculating quantities for speed and torque, wherein the evaluation unit comprises a means for calculating an average oscillation amplitude corresponding to the ignition frequency of a total energy level, and a means for calculating a total energy level from a momentary rotational angle velocity and from a momentary moment of inertia which are dependent on the crank angle and which take into account a kinetic energy of oscillating masses of said engine, the evaluation unit using the average oscillation amplitude as a dimensional quantity for torque.
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23. A method for testing an internal combustion engine, comprising the steps:
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continuously measuring a rotation angle velocity that is dependent on a crank angle; calculating a total energy level that is calculated from a momentary rotational angle velocity and from a momentary moment of inertia, which are dependent on the crank angle and take into account a kinetic energy of oscillating masses of said engine; determining an average oscillation amplitude corresponding to the ignition frequency in said total energy level; and utilizing said average oscillation amplitude as a quantity for torque. - View Dependent Claims (24)
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Specification