EP0244830A2
Expired / Lapsed
EP
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Electronic ignition signal distributor for automobile engine
Assignee: Hitachi Ltd
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Filing: 1987-05-06
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Granted: —
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Expires: 2007-05-06
Abstract
Abstract Disclosed is an electronic ignition signal distributor for automobile engine, in which cylinders of the engine are identified using an ignition sequence counter (5) and basing on a reference position signal and a crank angle signal. The cylinder identity signal is logically ANDED (AND-Gates 6-11) with the distributed ignition position signal before being applied to the ignition device (12-17), thereby preventing the delivery of an active ignition signal in the event of a malfunctioning of the counter or cylinder identifying circuit (3), and ultimately preventing an erroneous ignition of irrelevant cylinders caused by noise or the like.
Inventors
- 👤 Shoji Sasaki
- 👤 Kenji Tabuchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 16:19
CPC Classifications
F; F02; F02P; F02P3/00; F02P3/02; F02P3/04; F02P7/00; F02P7/02; F02P7/03; F02P7/035; F02P11/00; F02P11/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
200 words
An electronic ignition signal distributor for a multi-cylinder engine comprising: a reference position detector (l) coupled to the output shaft of said engine for detecting the position of each cylinder; a crank angle detector (2) coupled to the output shaft of said engine for detecting the rotational angle of said engine; an ignition signal producing means (4) which receives the output signals of said two detectors and produces an ignition signal (4a) by calculating an optimal ignition timing and current conduction time length applied to ignition coils of the cylinders; cylinder signal generating means (3) which produces, from the output signals of said two detectors, a reference cylinder signal (3a) which provides the reference of ignition sequence and cylinder signals (3a-3d) indicative of a cylinder to be ignited; reference cylinder signal distributing means (5) which receives the reference cylinder signal (3a) and ignition signal (4a) and produces ignition position signals (5a-5f); means (20-24) for producing cylinder ignition signals (22a-24a) from the cylinder signals (3a-3d); logical-product means (6-ll) which implement logical-product operations among groups of the ignition position signals (5a-5f), the ignition signal (4a) and the cylinder ignition signals (22a-24a); and ignition circuits (l2-l7) which receive outputs of said logical-product means.
Claim 2
Dependent Claim
200 words
An electronic ignition signal distributor for a multi-cylinder engine comprising: a reference position detector (l) coupled to the output shaft of said engine for detecting the position of each cylinder; a crank angle detector (2) coupled to the output shaft of said engine for detecting the rotational angle of said engine; an ignition signal producing means (4) which receives the output signals of said two detectors and produces an ignition signal (4a) by calculating an optimal ignition timing and current conduction time length applied to ignition coils of the cylinders; cylinder signal generating means (3) which produces, from the output signals of said two detectors, a reference cylinder signal (3a) which provides the reference of ignition sequence and cylinder signals (3a-3d) indicative of a cylinder to be ignited; reference cylinder signal distributing means (5) which receives the reference cylinder signal (3a) and ignition signal (4a) and produces ignition position signals (5a-5f); means (20-24) for producing cylinder ignition signals (22a-24a) from the cylinder signals (3a-3d); logical-product means (6-ll) which implement logical-product operations among groups of the ignition position signals (5a-5f), the ignition signal (4a) and the cylinder ignition signals (22a-24a); and ignition circuits (l2-l7) which receive outputs of said logical-product means.
Claim 3
Dependent Claim
98 words
An ignition signal distributor according to claim l, wherein said reference cylinder signal gener ating means (3) comprises means (3l) which receives the reference position signal (la) and crank angle signal (2a) to define the width of the reference position signal assigned to each cylinder; detecting means (30) which detects the rising edge of the reference position signal to produce a clear signal; and a counter (32) which receives and counts the output of said signal-width detector (3l) in response to an output (30a) of said detecting means (30) to produce the reference cylinder signal and cylinder signals.
Claim 4
Dependent Claim
76 words
An ignition signal distributor according to claim l, wherein said means for producing the cylinder ignition signals (22a-24a) comprises a logical-product means (20) receiving the reference position signal (la) and ignition signal (4a); a flip-flop (2l) which receives the output signal (20a) of the logical-product means (20) to produce a pulse signal; and logical-sum means (22-24) which receive the output signal of said flip-flop (2l) and cylinder signals (3a-3d) to produce the cylinder ignition signals (24a-24a).
Claim 5
Dependent Claim
26 words
An ignition signal distributor according to claim l, wherein the number of said cylinder signals (3a-3d) is smaller than the number of cylinders of said engine.
Claim 6
Dependent Claim
25 words
An ignition signal distributor according to claim l, wherein the number of cylinder signals (3a-3d) is equal to the number of cylinders of said engine.
References Cited (Backward Citations)
No citation records indexed.
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