Method of determining the rough engine run of an internal combus

Details Method of determining the rough engine run of an internal combus Method of determining the rough engine run of an internal combus

1992-03-17

1996-06-11

Raevis, Robert

Measuring and testing

Test stand

For engine

G01M 1500

Patent

active

055244807

DESCRIPTION:

BRIEF SUMMARY
STATE OF THE ART

The invention relates to a method of determining the rough engine run of an internal combustion engine. This is a measure for the irregularities in the angular velocity of the crankshaft caused by fluctuations in energy conversion (from cycle to cycle and between the cylinders of the internal combustion engine). On the one hand, rough engine run is caused by the fact that comparatively great variations may occur during the energy conversion. The variations are based on fluctuations of particle movements, the air ratio, the residual gas percentage, the temperature and the processes during start-up of the combustion process. Spark ignited as well as Diesel internal combustion engines are affected in the same way. In addition to these statistical processes there are systematic deviations or errors which result in an increase in rough engine run. This includes compression, possibly electrical ignition, valve play and measured additions of fuel which may be different for each cylinder of the internal combustion engine and thus influence rough engine run.
German Patent 3,505,440 discloses a method for analyzing the operational state of internal combustion engines equipped with electrical ignition systems wherein the number of revolutions of the internal combustion engine is determined with high time resolution--and thus the rough engine run--by an electronic measurement of the time interval between two successive ignition voltage pulses of different cylinders. Additionally, the ignition pulses of a reference cylinder are detected so as to permit an association of the rough engine run with the individual cylinders of the internal combustion engine.
It is the object of the invention to provide a method for determining the rough engine run of an internal combustion engine without the requirement of a special sensor and suitable for spark ignited as well as Diesel internal combustion engines.


SUMMARY OF THE INVENTION

The above object generally is accomplished according to the invention by 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 signal present at an output of a generator driven by the internal combustion engine or at a load connected to the generator.
The method according to the invention has the initial advantage of easy adaptation. It merely requires a connection to the generator or to a load connected to the generator. Insofar as the internal combustion engine is intended as a vehicle engine, it becomes possible to make a connection, for example, at the cigarette lighter. Since no special sensors are required, the method according to the invention is suitable equally well for determining the rough engine run of spark ignited as well as Diesel internal combustion engines.
Another advantage of the method according to the invention is that the determination of rough engine run is possible with different types of existing generators. Direct current, alternating current and three-phase current generators are suitable, with as well as without rectifiers.
Advantageous features and improvements of the method according to the invention are likewise disclosed.
According to a first embodiment, the rough engine run is determined from a component of a signal Ub which has a long period duration Tm. Times Tm correspond to the interval between every two combustion processes in the internal-combustion engine.
According to a further and preferred embodiment, it is provided that the rough engine run is determined from a component of signal Ub which includes a short period duration Tmn.
This feature has the advantage that the measured values are high in resolution since the generator driven by the internal combustion engine generally rotates at a higher number of revolutions than the internal combustion engine itself. The higher number of revolutions of the generator compared to that of the internal combustion engine and the signal curve Ub which is dependent upon the

REFERENCES:
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patent: 3924457 (1975-12-01), Oshima et al.
patent: 4123935 (1978-11-01), Maringer
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patent: 4924830 (1990-05-01), Abe
patent: 5087881 (1992-02-01), Peacock
Robert Bosch GmbH "Technische Unterrichtung, Generatoren", May 1974, Germany.

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