Method of determining the rough engine run of an internal combustion engine
First Claim
1. A method of determining the rough running of an internal combustion engine, wherein a signal processing arrangement determines the engine rotation of the internal combustion engine from a component of a signal present at a generator driven by the internal combustion engine or at a load connected to the generator, with the signal component having a short period duration and being caused by commutation processes in the generator and wherein a further signal processing arrangement is employed which determines the signal component having the short period duration from commutation oscillations of the signal from a generator configured as an alternating current/three-phase current generator equipped with a rectifier.
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Abstract
A method is proposed for determining the rough engine run of an internal combustion engine (10), wherein a signal processing arrangement (13-19, 30, 50, 51) determines the engine rotation from a signal (Ub) appearing at a generator (11) driven by the internal combustion engine (10) or at a load (12) connected to the generator (11). The signal (Ub) is composed of signal components including long period durations (Tm) and signal components including short period durations (Tmn) which are evaluated separately as well as together in an evaluation unit (15). The signal component including the short period durations (Tmn) can be derived from commutation oscillations (40) which occur within signal Ub if the generator (11) is configured as an alternating current/three-phase current generator and is equipped with rectifiers and phase fan-in.
22 Citations
12 Claims
- 1. A method of determining the rough running of an internal combustion engine, wherein a signal processing arrangement determines the engine rotation of the internal combustion engine from a component of a signal present at a generator driven by the internal combustion engine or at a load connected to the generator, with the signal component having a short period duration and being caused by commutation processes in the generator and wherein a further signal processing arrangement is employed which determines the signal component having the short period duration from commutation oscillations of the signal from a generator configured as an alternating current/three-phase current generator equipped with a rectifier.
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7. In a method of determining the rough running of an internal combustion engine, including determining the engine rotation of the internal combustion engine from a component of a signal present at an output of a generator driven by the internal combustion engine or at a load connected to the generator;
- the improvement wherein the signal component used for said determination is caused by commutative processes in the generator and has a short period duration, the generator is configured as an alternating current/three-phase current generator provided with a rectifier; and
said signal component having the short period duration is determined by detecting groups of commutation oscillations of a different period duration in the signal from the generator. - View Dependent Claims (8, 9, 10, 11, 12)
- the improvement wherein the signal component used for said determination is caused by commutative processes in the generator and has a short period duration, the generator is configured as an alternating current/three-phase current generator provided with a rectifier; and
Specification