Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1987-11-23
1989-12-26
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Fuel injection system
123643, F02P 504, F02P 108, F02B 502
Patent
active
048890944
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a method for recognizing the power stroke of a cylinder of an internal combustion engine in particular a four-stroke piston engine having an odd number of cylinders, wherein a signal is generated which is indicative of a fixed crankshaft angle.
In certain types of control in internal combustion engines, in particular in ignition or injection control, recognition of the power stroke of a particular cylinder is necessary. Typically, a transducer is provided for this purpose, which responds to a marking provided on the cam shaft of the engine. However, since the angular accuracy of this transducer is inadequate, primarily because of the mechanical play involved, this transducer signal is linked with a signal of an rpm transducer, which responds to markings on a transducer disk that rotates with the crankshaft.
From U.S. Pat. No. 3,592,178, an electronic ignition system is known in which for regulating the ignition angle and for cylinder recognition, a transducer disk that rotates in synchronism with the rotor of the ignition distributor is used. One transducer is provided for continuous rotational angle information, and a further transducer is provided for cylinder recognition.
SUMMARY OF THE INVENTION
It is the object of the present invention to discover a method for recognizing the power stroke of a cylinder of an internal combustion engine which has the high accuracy of the angular resolution of a transducer system, and the transducer wheel of which is located directly on the crankshaft of the engine.
This object is attained by means of the method according to the invention by generating a second signal which is assigned to the basic frequency of the combustion processes in the engine, and by combining the first and second signals in logic circuits generating a recognition signal.
Advantages of the Invention
The method according to the invention has the particular advantage that it needs only a single transducer. This is advantageous in terms of cost. A further particular advantage is that the operational reliability of the system is increased, because the reduced number of system components reduces the number of possible failures.
Particularly advantageous features of the provision according to the invention are recited in the dependent claims. They are based on the use of physical variables of the engine which undergo a change due to the ongoing operational processes of the engine. The signals of transducers that may already be provided on the engine for other purposes can also be used in the method according to the invention. With the dual utilization of system components enabled thereby, a further particularly advantageous cost reduction for the overall system is possible.
DRAWING
An exemplary embodiment of the invention is shown in the drawing and described in further detail in the ensuing description. FIG. 1 is a signal diagram explaining the mode of operation; and FIG. 2 is a circuit diagram of the exemplary embodiment.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
In the first line of FIG. 1, an ignition sequence Z of an operating five-cylinder internal combustion engine during two crankshaft revolutions is plotted over the crankshaft angle through which rotation has taken place. The ignition sequence of the individual cylinders, 1-2-4-5-3, is also shown. From this, it is clear that from one power stroke of one cylinder to the next, an interval of two crankshaft revolutions is necessary in each case. The illustration in FIG. 1 is fairly accurately representative of the behavior of the engine during quiet idling operation.
In the second line of FIG. 1, a signal SK is shown, which originates in a transducer that responds to a marking provided on a transducer disk that rotates synchronously with the crankshaft. The signal SK accordingly corresponds to a pulse train, which is formed by a train of individual pulses that are emitted upon each complete revolution of the transducer disk.
In the third line of FIG. 1, a signal SM is shown, which is proportional to t
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patent: 4268888 (1981-05-01), Bodig et al.
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patent: 4429365 (1984-01-01), Luckman et al.
patent: 4596227 (1986-06-01), Hashizume
patent: 4656993 (1987-04-01), Yuzawa et al.
Beyer Hans-Ernst
Bonitz Jorg
Entenmann Robert
Forster Siegmar
Knab Rochus
Nelli Raymond A.
Robert & Bosch GmbH
Striker Michael J.
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