Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1989-03-06
1990-02-20
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Fuel injection system
123617, F02P 7067
Patent
active
049016970
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for controlling an internal combustion engine. In devices for controlling an internal combustion engine of a motor vehicle, particularly for controlling the ignition and the like, it is known to use sensor systems for detecting an angular position of a shaft of the internal combustion engine, particularly the crankshaft or the camshaft.
Such systems are constructed e.g. as segment systems in and transmitter disks rotate with the shaft, which are provided at their circumference with a plurality of segments, i.e. elongated marked areas, proportional to the number of cylinders of the internal combustion engine. In the detection of the angular position of the crankshaft, the number of segments amounts to one half of the number of cylinders. In the detection of the angular position of the camshaft the number of segments is identical to the number of cylinders, since the crankshaft rotates at twice the speed of the camshaft, as is known. Every segment is assigned to a cylinder (n) of the internal combustion engine (two cylinders in the detection of the angular position of the crankshaft), and every ignition process is controlled as a function of the passage of a respective segment. In a stationary receiving element, the leading edge of the segment is detected, and the control processes for the internal combustion engine are triggered by a suitable time control over the entire length of the segment. On the other hand, segment systems with segments of equal dimensions have the disadvantage that an assignment, which is sufficient for a high-voltage distribution without the use of a distributor or for a dual-circuit (e.g. eight-cylinder engine) high-voltage distribution, is not possible.
In addition, segment systems are known in which individual segments are divided by a number of teeth and tooth spaces and the signals produced by the teeth and tooth spaces, respectively, are fed to a control circuit. In so doing, the angular position of the shaft is determined by counting the passing teeth and tooth spaces, respectively. This method is costly and requires an additional counting device.
In addition, if only a single tooth space is formed in a segment, there is the risk that the additional trailing edge will trigger an additional ignition.
In all devices mentioned here, at least one revolution is required when starting the internal combustion engine in order to detect an accurate assignment of the marking.
SUMMARY OF THE INVENTION
The object of the invention is a device in which it is possible to assign the ignition pulses for a high-voltage distribution without the use of a distributor or for a dual-circuit high-voltage distribution with a single transmitter while maintaining the two electrical marks at the beginning and end of the segment. The object of the invention is achieved by assigning a permanent magnet to at least one segment as a mark which generates a signal which can be fed to a control circuit. Because of the resulting electric signals (markings), the cylinder groups can be clearly assigned in a high-voltage distribution without the use of a distributor. It is not necessary to change the profile of the segments, so that no cracks can occur as a result of of stresses particularly at high engine output moments.
The total length of the segment having the permanent magnet thereon is equal to that of other segments.
The present invention as to its construction so to its method of operation, together with additional objects and advatnages thereof, will be best understood from the following description of the preferred embodiment with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a basic view of a transmitter disk of the device according to the present invention;
FIGS. 2a, 2b, and 2c show a pulse diagram; and
FIG. 3 shows a circuit diagram according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In FIG. 1, a transmitter disk designated by 1, 1 rotates with a crankshaft or a camsha
REFERENCES:
patent: 4072893 (1978-02-01), Huwyler
patent: 4327687 (1982-05-01), Haubner et al.
patent: 4744343 (1988-05-01), Bisenius et al.
Patent Abstracts of Japan, vol. 5, Nr. 199 (M-102)(871), 17 Dec. 1981, & JP, A, 56118560 (Hitachi Seisakusho K.K.), 17 Sep. 1981.
Patent Abstracts of Japan, vol. 5, Nr. 53 (M-63)(725), 14 Apr. 1981, & JP, A, 569660 (Hitachi Seisakusho K.K.), 31 Jan. 1981.
Argenbright Tony M.
Mates Robert E.
Robert & Bosch GmbH
Striker Michael J.
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