Abstract:
Ein Zündsteuerungssystem ist auf eine Verbrennungsmaschine angewendet, die eine Zündspule, ein Schaltelement (12) und einen Messungserfassungsteil (14) hat, der mindestens entweder eine Primärspannung, eine Sekundärspannung oder einen Sekundärstrom erfasst. Die Zündspule hat eine Primärspule (11A) und eine Sekundärspule (11B). Das Schaltelement führt eine Leitung und eine Unterbrechung des Primärstroms zu der Primärspule durch. Das Zündsteuerungssystem hat eine Primärstromsteuerungseinheit (15, 20), die bei der Zündkerze eine Funkenentladung erzeugt, indem der Primärstrom durch die Primärspule gelassen wird, und eine Unterbrechung des Primärstroms durchgeführt wird, und einen Entladungskurzschlussbestimmungsteil (15), der basierend auf einem gemessenen Wert eine Erzeugung eines Entladungskurzschließens bestimmt. Die Primärstromsteuerungseinheit erzeugt die Funkenentladung wieder, wenn ein Entladungskurzschließen auftritt.
Abstract:
Eine Zündvorrichtung für eine Verbrennungsmaschine, die mit einer Zündspule (10) und einer Zündkerze (30) versehen ist. Eine ECU (20) ermöglicht einen Betrieb einer Mehrzahl von kontinuierlichen Entladungen bei der Zündkerze (30) und erfasst ferner eine Strömungsgeschwindigkeit einer verbrennbaren Luft/Kraftstoff-Mischung. Bei einer ersten Entladung beendet eine Versorgung mit einem Primärstrom (I1) die erste Entladung, wobei Energie in der Zündspule (10) verbleibt, von einer Auslösung der Zündung bis zu einer Auslösung der Zündkerze (30), wenn die erfasste Strömungsgeschwindigkeit eine vorbestimmte erste Schwelle überschreitet. Eine zweite Entladung wird danach durch Abschalten des Primärstroms (I1) durchgeführt.
Abstract:
Eine Zündkerze 1 weist eine Mittelelektrode 4 und eine Masseelektrode 5 auf, die einander gegenüber liegen, und bewirken, dass durch Anlegen einer Spannung zwischen der Mittelelektrode 4 und der Masseelektrode 5 eine Funkenentladung stattfindet. Weiterhin weist die Mittelelektrode 4 ein stabförmiges Haupt-Chipelement 10, das an einem distalen Ende derselben durch Schweißen über einen Verschmelzungsabschnitt 12 angeordnet ist, und ein ringförmiges Neben-Chipelement 11 auf, das den Verschmelzungsabschnitt 12 umgibt. Wenn folglich eine von der Mittelelektrode 4 stattfindende Funkenentladung auf die stromabwärtige Seite durch den Einfluss einer Gasströmung in einem Zylinder einer Verbrennungsmaschine geblasen wird, kann verhindert werden, dass in dem Verschmelzungsabschnitt 12 ein Kathodenpunkt gebildet wird, da der Verschmelzungsabschnitt 12 durch das Neben-Chipelement 11 umgeben und somit geschützt ist. Folglich kann die Abnutzung der Mittelelektrode 4 verhindert werden, wodurch sich die Lebensdauer der Zündkerze 1 verlängert.
Abstract:
PROBLEM TO BE SOLVED: To provide a simply structured spark plug for an internal combustion engine, capable of securing stable ignitability regardless of a mounting attitude to the internal combustion engine.SOLUTION: A spark plug 1 has a cylindrical housing 2, a cylindrical insulator 3 held on the inside of the housing 2, a center electrode 4 held on the inside of the insulator 3 so that a tip part 41 thereof protrudes, a grounding electrode 5 protruding toward the tip side from a tip part 21 of the housing 2 and forming a spark discharge gap G between itself and the center electrode 4, a confronting projection 23 protruding to the tip side from the tip part 21 of the housing 2 at a position opposite to the grounding electrode 5 with the center electrode 4 held between, an electrode side air guiding projection 22 protruding to the tip side from the tip part 21 of the housing 2 at a position nearer to the grounding electrode 5 than to the confronting projection 23, and a confronting air guiding projection 24 protruding to the tip side from the tip part 21 of the housing 2 at a position nearer to the confronting projection 23 than to the grounding electrode 5.
Abstract:
PROBLEM TO BE SOLVED: To prevent a false determination when determining a cylinder having an abnormal ignition plug based on an ion current. SOLUTION: A system detects a spike noise superposed on ion current for each cylinder, and determines a cylinder where an occurring frequency of a spike noise abnormal cycle in which the spike noise occurs frequently becomes greater than a determination threshold value to be a cylinder having an abnormal ignition plug. When an ignition plug of a single-pole or three-pole ground electrode is mounted, the determination process of the cylinder having the abnormal ignition plug is inhibited within a knocking determination section and within a high-speed range where an engine speed is greater then a predetermined speed. On the other hand, when an ignition plug or a creeping discharge plug of a two-pole or four-pole ground electrode where the ground electrodes are provided in 180° symmetry is mounted, the determination process of the cylinder having the abnormal ignition plug is executed similar to the other ranges, even within the knocking determination section and even within the high-speed range without inhibiting the determination process of the cylinder having the abnormal ignition plug. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a spark plug for an internal combustion engine, capable of sufficiently preventing the occurrence of noises when detecting an ion current, while securing normal spark discharge in a spark discharge gap.SOLUTION: The spark plug 1 for the internal combustion engine includes a fitting 2, an insulator 3, a center electrode 4, a main ground electrode 51 forming the spark discharge gap between the center electrode and itself, and a sub ground electrode 52 forming a corona discharge gap between a front end outer peripheral angle portion 311 at an insulator front end 31 and itself. The insulator has a conductive coat formed on at least part of the outer surface opposed to the fitting. The front end outer peripheral angle portion has a curvature radius of 0.5 mm or smaller. A close point 521 of the sub ground electrode is arranged at the side of the front end beyond a front end face 312 of the insulator. G1≤G2, H1≤1.4 mm, and H2≤0.5 mm are satisfied, where H1 is a radial distance between an intersection Q and the close point, H2 is an axial distance, G1 is the size of the spark discharge gap, and G2 is the size of the corona discharge gap.
Abstract:
PROBLEM TO BE SOLVED: To provide a spark plug for an internal combustion engine capable of fully preventing generation of noises at the time of detection of ion current, and to provide a manufacturing method for the spark plug. SOLUTION: The spark plug for the internal combustion engine 1 includes a center electrode 2, an insulator 3 which penetrates and holds the center electrode 2 in the inside, a housing 4 which penetrates and holds the insulator 3 inside, and a ground electrode 5 which is jointed to the housing 4 and forms a spark discharge gap 11 between the center electrode 2. A conducting thin film 61 is formed, on at least a part of the outer circumferential face 31 of the insulator 3 that is opposed to the inner circumferential face 41 of the housing 4. A frame electrode 62, having a thickness larger than the conducting thin film 61, is formed along the direction, having an axial direction component of the spark plug 1. The conducting thin film 61 and the frame electrode 62 are electrically connected to the housing 4. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a spark plug protection cylinder, easily mountable on a spark plug at an appropriate position and easily detachable from the spark plug.SOLUTION: A protection cylinder 1 for a spark plug 6 of an internal combustion engine, including a center electrode 2, an electric porcelain 3 for insulation, an attachment metal fitting 4 having an attachment screw 41 formed on the outer circumference surface and a grounding electrode 5, is detachably disposed on the outer circumference of the attachment screw 41. On the base end side of the attachment screw 41, the attachment metal fitting 4 includes a flange 42 having a large diameter than the attachment screw 41. The protection cylinder 1 includes: a main body cylinder 11 having an inner diameter larger than and including the diameter of the attachment screw 41, and smaller than the diameter of the flange 42; a large-diameter cylinder 12 having an inner diameter larger than and including the diameter of the flange 42; and a step portion 13 formed between the large-diameter cylinder 12 and the main body cylinder 11.
Abstract:
PROBLEM TO BE SOLVED: To provide a spark plug in an internal combustion engine capable of preventing reduction in thermal value and eliminating a crack in an insulator. SOLUTION: The spark plug in the internal combustion engine has a central electrode 2, a cylindrical insulator 3 internally retaining the central electrode 2, and a cylindrical mounting tool 4 internally retaining the insulator 3. The central electrode 2 has a locking unit 22 for determining the axial direction of the central electrode 2 with respect to the insulator 3. The insulator 3 has a locking receiver 32 for receiving the locking unit 22 of the central electrode 2 on the inner wall 311 of an axial hole 31 to pass through the central electrode 2. The inner wall 311 of the axial hole 31 is provided with a parallel portion 34 formed in parallel to the outer side of the central electrode 2 at the farther extremity than the locking receiver 32, and is provided with an expanding radius 35 with a larger clearance to the outer side of the central electrode 2 than to the parallel portion 34 is formed in between the parallel portion 34 and the locking receiver 32. COPYRIGHT: (C)2009,JPO&INPIT