US 4,656,993 AGranted

Crank angle detecting system for engines

AssigneeNissan Motor Co., Ltd.

InventorsHaruo Yuzawa, Masafumi Nishiyama, Katsuyuki Nakamura, Kazuhiro Ishigami

Life of this patent

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Abstract

A crank angle detecting system for a multicylinder engine includes a disc formed with a large number of slits to detect one-degree crank angular positions and a small number of slits to detect a predetermined piston stroke for each cylinder. Since the widths of a small number of slits are different from each other, it is possible to separately discriminate each cylinder in crank angular position on the basis of the crank angle signals obtained by a large number of slits. In the case where the detecting system is incorporated with a group-ignition system, it is possible to detect a predetermined piston stroke for each cylinder immediately after the engine is started, thus preventing the engine from erroneous ignition.

Claims4

Dependent claims

A crank angle detecting system for a multicylinder engine having at least three cylinders classified as groups, which comprises:

(a) a disc connected for rotation with a crankshaft and formed with a first slit group having a large number of slits for detecting crankshaft angular positions and a second slit group having a small number of slits for detecting each predetermined piston stroke of each of said at least three cylinders, said slits of said second group having at least three widths which are different from each other;
(b) sensing means responsive to said slits on said disc for continuously detecting crankshaft angular positions by sensing said first group of slits and producing crank angle signals corresponding to the slits of said first group and for detecting each predetermined piston stroke of each engine cylinder by sensing said second group of slits and producing piston stroke signals representing said piston strokes, each piston stroke signal having a duration which corresponds to one of said different widths;
and
(c) means for identifying said piston stroke signals based on the duration thereof by counting crank angle signals occurring during the duration of each piston stroke signal and classifying said piston stroke signals based on said counted crank angle signals.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 06/709,665Filed 8 Mar 1985
Priority: JP 59-3718214 Mar 1984
Granted: 14 Apr 1987
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

F02D 41/009
Electrical control of supply of combustible mixture or its constituents: using means for generating position or synchronisation signals
F02D 41/36
Of the low pressure type: with means for controlling distribution
F02P 5/1506
Using one central computing unit: with particular means during starting
F02P 7/073
Of circuit-makers or -breakers, or pick-up devices adapted to sense particular points of the timing cycle: optical pick-up devices