Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1994-12-15
1995-11-28
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Fuel injection system
F02P 500
Patent
active
054698235
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention relates to a sensor arrangement for rapid cylinder detection in a multi-cylinder internal combustion engine of the generic type of the main claim.
It is known that in a four-stroke internal combustion engine the crankshaft rotates twice per work operation and thus passes through an angle of 720.degree. before a specific cylinder assumes the same working position again. In order to detect the instantaneous position of a specific cylinder, it is therefore not sufficient to determine the angular position of the crankshaft within a revolution, but instead it is necessary to detect whether precisely the first or the second crankshaft revolution is taking place.
For this purpose, it is known, for example from the non prepublished German patent application P 41 41 13, to use, in addition to a crankshaft sensor which senses a disc with a plurality of marks and a reference mark formed by two missing mark, also a camshaft sensor which senses a disc connected to the camshaft. This disc has marks which are of different lengths, are matched to the number of cylinders and bring about in the sensor an output signal which can be used for cylinder identification.
For this cylinder identification, the two output signals are combined in the control device and the cylinder identification is carried out from the sequence thus obtained of high and low phases of different length.
This known arrangement has the disadvantage that a relatively complex evaluation is required and, for an unambiguous cylinder assignment it is necessary to evaluate the sequence of several segments, as a result of which a rapid ignition output is prevented.
A further sensor arrangement for cylinder detection in which a sensor disc which rotates in synchronism with the ignition distributor and is sensed by a detector has a plurality of shutter cutouts is known from the German Offenlegungsschrift DE-A 36 34 587, one of the said shutter cutouts being widened, and a disc which is connected to the crankshaft, has a reference mark and is sensed by a second detector furthermore being present. In this arrangement, under unfavourable circumstances the crankshaft must rotate twice before a cylinder identification is possible.
ADVANTAGES OF THE INVENTION
The sensor arrangement according to the invention for cylinder detection in a multi-cylinder internal combustion engine has, in contrast with the above, the advantage that a simple evaluation is possible and the number of different types of segment on the disc connected to the camshaft is minimal even with a large number of cylinders and, as a result, the different segments are clearly distinguished from one another.
These advantages are achieved in that not only the sequences of marks and segments of the camshaft disc is evaluated, but in addition also the occurrence of the reference mark is tested so that therefore a combination of the signals of camshaft sensor and crankshaft sensor is used for cylinder detection. However, so that such an evaluation is possible, it is necessary to ensure that an unambiguous assignment of crankshaft and camshaft is ensured.
It is particularly advantageous that the length of the high phases and of the low phases can take place by simply counting out the pulses produced by the multiplicity of marks of the crankshaft sensor. Furthermore, it is advantageous that an tunambiguous cylinder assignment can take place with the evaluation of only one segment and thus a rapid ignition output and also a rapid sequential injection in the case of starting is possible. Further advantageous embodiments of the sensor arrangement according to the invention are achieved with the features disclosed in the subclaims.
BRIEF DESCRIPTION OF THE FIGURES
FIG. 1 shows a rough overview of the sensor arrangement according to the invention, in FIGS. 2(A-D) signal characteristics are disclosed which are obtained for sensor discs which are adapted to four, five or six cylinder internal combustion engines.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
In FIG. 1, the most significant e
REFERENCES:
patent: 4941446 (1990-07-01), Denz et al.
patent: 5156125 (1992-10-01), Fukui et al.
patent: 5269274 (1993-12-01), Flaetgen et al.
patent: 5325710 (1994-07-01), Morikawa
patent: 5329904 (1994-07-01), Kokubo et al.
Ott Karl
Strate Joachim
Walter Klaus
Nelli Raymond A.
Robert & Bosch GmbH
Striker Michael J.
LandOfFree
Sensor arrangement for rapid cylinder detection in a multi-cylin does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sensor arrangement for rapid cylinder detection in a multi-cylin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sensor arrangement for rapid cylinder detection in a multi-cylin will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2006180