Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1997-02-03
1998-10-20
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Fuel injection system
731173, 123419, 123436, 123479, 701111, F02D 4134
Patent
active
058231668
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on an apparatus for recognizing the cylinders in a multi-cylinder internal combustion engines.
In multi-cylinder internal combustion engines with a crankshaft and a camshaft, the engine control unit, as a function of the detected position of the crankshaft or camshaft, calculates the instant at which fuel is to be injected for which cylinder, and when ignition is to be tripped in which cylinder. It is conventional to ascertain the angular position of the crankshaft with the aid of a sensor that scans the crankshaft, or a disk connected to it, with a characteristic surface, for instance with many identical angle markers and one reference marker.
Since during one operating cycle the crankshaft rotates twice while the camshaft rotates only once, the phase relationship of the engine cannot be determined unambiguously from the crankshaft sensor signal alone; it is therefore usual to ascertain the camshaft position as well, with the aid of its own sensor, a so-called phase sensor, with a single marker, for instance, on one of the disks associated with the camshaft, which when this marker moves past the sensor generates a voltage pulse in the sensor.
With the aid of such an arrangement, which is described for instance in German Published, Unexamined Patent Application DE-OS 42 30 616, synchronization between the crankshaft and camshaft can be accomplished in a four-stroke internal combustion engine; it is then possible, by evaluating the two signals of the crankshaft and camshaft sensor, to perform an unambiguous cylinder recognition.
An apparatus for cylinder recognition in multi-cylinder internal combustion engines that does not require its own phase sensor is known from Published, Unexamined German Patent Application DE-OS 41 22 786. In this apparatus, after the engine is started, injections into a cylinder are tripped at certain angular positions; initially, no notice is taken as to whether the crankshaft is in its first or in its second revolution in one operating cycle. The reaction of the engine to this injection, or in other words the change in rpm resulting from the injection, is observed, and as a function of the rpm change it is learned which revolution the crankshaft is currently involved in, and whether the injection was done at the correct rotary angle.
SUMMARY OF THE INVENTION
In keeping with these objects, one feature of present invention resides, briefly stated, in an apparatus for cylinder recognition in an internal combustion engine, which is designed so that after the engine is turned on, the course of the rpm or a variable dependent on this course, is ascertained over at least one operating cycle of the engine and stored in the memory, and the next time the engine is turned on, on the rpm course, is ascertained again and compared with the memorized rpm course, for detecting cylinder-characteristic rpm fluctuations and therefore for cylinder identification.
The apparatus according to the invention for cylinder recognition in a multi-cylinder internal combustion engine, has the advantage that no phase signal is needed for cylinder recognition, and that it is possible not only to detect which revolution the crankshaft is involved in at that moment but also that an unambiguous cylinder recognition is possible directly.
These advantages are attained by performing a very precise analysis of the course of rpm, and by detecting fluctuations in engine rpm and individual cylinder rpm, even in normal operation, and using them for unambiguous cylinder identification.
It is especially advantageous that for each internal combustion engine, a cylinder-specific rpm distribution can be stored in a memory, and by comparing the measured rpm distribution with the stored rpm distribution, it can be learned immediately which cylinder is at its top dead center at that moment.
It is also advantageous that the apparatus according to the invention can also be used in combination with rundown detection and can then be used to monitor the current phase relation asce
REFERENCES:
patent: 4616617 (1986-10-01), Geiger et al.
patent: 5329904 (1994-07-01), Kokubo et al.
patent: 5377537 (1995-01-01), James
patent: 5447143 (1995-09-01), Ott et al.
"Patent Abstracts of Japan", vol. 9, No. 198 (M-404), Abstract of JP-60-62665, Aug. 1985.
Entenmann Robert
Ries-Muller Klaus
Argenbright Tony M.
Robert & Bosch GmbH
Striker Michael J.
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