Patents Assigned to SEM AB
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Patent number: 11560869Abstract: An electronic circuit (101) for controlling a spark of a spark plug (SP1) in a capacitor discharge ignition system (100) for a combustion engine. The electronic circuit (101) comprises an ignition coil (110) dimensioned and configured to provide current to the spark plug (SP1), an ignition capacitor (C1) dimensioned and configured to supply energy to the primary winding (L1), an voltage source (130) dimensioned and configured to supply energy to at least one of the ignition capacitor (C1) and the primary winding (L1), a first switch (SW1) connected to the first primary terminal (TL1) and the first source terminal (TS1), a second switch (SW2) connected to the second capacitor terminal (TC2) and the second source terminal (TS2), and a third switch (SW3) connected to the second capacitor terminal (TC2) and the first source terminal (TS1). A capacitor discharge ignition system (100) including the electronic circuit (101) and a combustion engine including the capacitor discharge ignition system (100).Type: GrantFiled: December 22, 2021Date of Patent: January 24, 2023Assignee: SEM ABInventors: Jörgen Bengtsson, Bert Gustafsson, Johan Eklund, Tomas Karlsson, Lars Svensson
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Publication number: 20220099062Abstract: A magneto ignition system for battery less hand-held combustion engines includes a claw generator with a stationary circular power coil winding enclosed by two iron claw halves and with a rotating flywheel magnet ring with multiple magnetic poles. The stationary circular coil winding includes a trigger coil with a stationary coil winding arranged in a plane orthogonal to the stationary circular power coil winding. The magneto ignition system further includes an engine control module ECM for establishment of appropriate ignition timing, and an ignition coil module ICM. The stationary circular power coil winding may provide the electrical power supply to both the ignition timing module ECM and the ignition coil module ICM.Type: ApplicationFiled: November 22, 2019Publication date: March 31, 2022Applicant: SEM ABInventors: Jörgen BENGTSSON, Bert GUSTAFSSON, Lars SVENSSON
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Patent number: 11225939Abstract: The present invention relates to a spark plug extension body connecting an ignition coil with a spark plug for a spark ignited internal combustion engine, as well as a method for providing such a spark plug extension body for reduction of partial electrical discharges in the spark plug extension body. In conventional spark plug extensions are coil springs used as electrical conductor against the spark plug terminal and/or ignition coil terminal. These coil springs cause Corona effects and short circuiting requiring replacement of the spark plug extension. With the invention the entire electrical conductor (CRu, 64, CRL) is in a rod like form and at least both ends (CRu, CRL) of the electrical conductor (CRu, 64, CRL) are made as a monolith in a flexible and electrically conducting polymeric material, preferably electrically conducting rubber.Type: GrantFiled: June 12, 2018Date of Patent: January 18, 2022Assignee: SEM ABInventors: Jorgen Bengtsson, Bert Gustafsson, Mats Andren
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Publication number: 20210180555Abstract: The invention relates to an improved ignition system for spark ignited combustion engines. According to the invention the voltage over a coil winding 6P on the primary side of the ignition coil is regulated to a sufficiently low voltage level during timed periods of the ignition cycle, such that at least one function out of three in total, i.e. prevention of premature spark-on-make, or spark suppression after onset of ignition, or improved frequency response between primary and secondary side of the ignition coil after end of ignition, is obtained. When applied in an inductive ignition system a differential amplifier (8) may be connected over the primary winding 6P regulating a control switch 2CS via a drive unit (9). The invention is preferably implemented in ignition systems with ion sense circuitry 5C,5R on the secondary side of the ignition coil, and implementing all three functions.Type: ApplicationFiled: August 30, 2019Publication date: June 17, 2021Applicant: SEM ABInventors: Patrik ALRIKSSON, Jörgen BENGTSSON
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Patent number: 10989160Abstract: A method for extracting characterizing features from an ion current trace retrieved from spark plugs of cylinders of an internal combustion engine, comprises the steps of: i. dividing the ion current signal into crank angle subintervals; 5 ii. calculating a measure of ion current in each crank angle subinterval; and iii. Performing a calculation on the measure of ion currents from different subintervals such that the result of the calculation is dimension free. Further it relates to a method of monitoring combustion processes where a plurality of ion current signals from a number of spark plugs (4A, 4B) are 10 retrieved and used in combination.Type: GrantFiled: March 22, 2019Date of Patent: April 27, 2021Assignee: SEM ABInventor: Jakob Angeby
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Publication number: 20200003582Abstract: The invention relates to an inductive position sensor, comprising: a first part with a cylindrical coil winding (14) having a longitudinal direction, a second part with a soft magnetic plunger core (20). The invention also relates to the soft magnetic plunger core and a magnetic shield around said cylindrical coil winding for said inductive position sensor. According to the invention is the soft magnetic plunger core as well as the magnetic shield hollow, preferably with circular cross-section, and made from electrical steel or soft iron sheet material.Type: ApplicationFiled: February 16, 2018Publication date: January 2, 2020Applicant: SEM ABInventor: Jörgen BENGTSSON
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Publication number: 20190219023Abstract: A method for extracting characterizing features from an ion current trace retrieved from spark plugs of cylinders of an internal combustion engine, comprises the steps of: i. dividing the ion current signal into crank angle subintervals; 5 ii. calculating a measure of ion current in each crank angle subinterval; and iii. Performing a calculation on the measure of ion currents from different subintervals such that the result of the calculation is dimension free. Further it relates to a method of monitoring combustion processes where a plurality of ion current signals from a number of spark plugs (4A, 4B) are 10 retrieved and used in combination.Type: ApplicationFiled: March 22, 2019Publication date: July 18, 2019Applicant: SEM ABInventor: Jakob ANGEBY
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Patent number: 10288032Abstract: A method for extracting characterizing features from an ion current trace retrieved from spark plugs of cylinders of an internal combustion engine, comprises the steps of: i. dividing the ion current signal into crank angle subintervals; ii. calculating a measure of ion current in each crank angle subinterval; and iii. Performing a calculation on the measure of ion currents from different subintervals such that the result of the calculation is dimension free. Further it relates to a method of monitoring combustion processes where a plurality of ion current signals from a number of spark plugs (4A, 4B) are retrieved and used in combination.Type: GrantFiled: April 25, 2017Date of Patent: May 14, 2019Assignee: SEM ABInventor: Jakob Angeby
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Patent number: 10164410Abstract: The following invention relates to an ignition coil assembly for an ignition system comprising an ignition coil where said assembly has a main axis and is configured for insertion into and/or removal out of a well associated with an internal combustion engine, wherein the assembly comprises an elongated extension body made of flexible material, said extension body comprising an upper end portion and a lower end portion wherein the extension body is arranged to be transversally bendable in relation to the main axis so that the upper end portion and the lower end portion may assume an angle (?) in relation to each other.Type: GrantFiled: May 14, 2013Date of Patent: December 25, 2018Assignee: SEM ABInventors: Lars-Ake Andersson, Jorgen Bengtsson, Bert Gustafsson
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Patent number: 9945751Abstract: A computer-implemented platform may comprise hardware and software configured to manage an engine using knock intensity data. Knock intensities from a plurality of combustion cycles may be used to estimate a statistical distribution of knock intensities. The distribution of knock intensities may be used to determine a Descriptive Statistic, which may represent a state of tune of the engine. A calculated Descriptive Statistic may be compared to a desired Descriptive Statistic (e.g., that is representative of operation during a desired tune state of the engine). A deviation between the calculated and desired knock intensity distributions (e.g., between the calculated DS and desired DS) may be used to adjust a control parameter of the engine. Adjustment may be engine-wide. Adjustment may be cylinder-by-cylinder.Type: GrantFiled: November 24, 2014Date of Patent: April 17, 2018Assignee: SEM ABInventors: Jakob Olofsson Ängeby, Sven Jörgen Peder Bengtsson
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Patent number: 9945303Abstract: The present invention relates to a method for controlling the performance of an engine, comprising the steps detecting an ion current in the form of a first signal analysing said first signal to determine at least one property determining a knock index based on said first signal and preferably on said at least one property combining said knock index with a plurality of factors related to properties of the engine or the operation of the engine to arrive at a engine index, and comparing said engine index with a sensitivity map of the engine to determine a correction required to improve the operation of the engine, and correcting the operation of the engine in accordance with the correction determined. The invention also relates to a system for controlling the performance of an engine.Type: GrantFiled: May 7, 2014Date of Patent: April 17, 2018Assignee: SEM ABInventor: Jorgen Bengtsson
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Patent number: 9810191Abstract: This invention relates to an engine for a vehicle using alternative fuel, preferably gas, comprising an engine (5) having a spark ignited ignition system (2) wherein said ignition system (2) includes misfire detection by means of a sensor device (4) providing information to a control system (20), connected to or within said ignition system (2), and wherein said combustion includes diluted operation to optimize emissions wherein said sensor device (4) includes an ion sensing measurement means (40) arranged to measure an ion current in said engine (5) and that said ignition system (2) has a built-in function to detect misfiring through an analysis of the ion current of the engine (5) during combustion.Type: GrantFiled: February 11, 2013Date of Patent: November 7, 2017Assignee: SEM ABInventors: Jörgen Bengtsson, Lars-Åke Andersson, Bert Gustafsson
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Publication number: 20170234286Abstract: A method for extracting characterizing features from an ion current trace retrieved from spark plugs of cylinders of an internal combustion engine, comprises the steps of: i. dividing the ion current signal into crank angle subintervals; ii. calculating a measure of ion current in each crank angle subinterval; and iii. Performing a calculation on the measure of ion currents from different subintervals such that the result of the calculation is dimension free. Further it relates to a method of monitoring combustion processes where a plurality of ion current signals from a number of spark plugs (4A, 4B) are retrieved and used in combination.Type: ApplicationFiled: April 25, 2017Publication date: August 17, 2017Applicant: SEM ABInventor: Jakob ANGEBY
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Patent number: 9651453Abstract: A method for extracting characterizing features from an ion current trace retrieved from spark plugs of cylinders of an internal combustion engine, comprises the steps of: i. dividing the ion current signal into crank angle subintervals; ii. calculating a measure of ion current in each crank angle subinterval; and iii. Performing a calculation on the measure of ion currents from different subintervals such that the result of the calculation is dimension free. Further it relates to a method of monitoring combustion processes where a plurality of ion current signals from a number of spark plugs (4A, 4B) are retrieved and used in combination.Type: GrantFiled: January 30, 2013Date of Patent: May 16, 2017Assignee: SEM ABInventor: Jakob Angeby
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Patent number: 9353723Abstract: The present invention relates to an ignition system (T) for a combustion engine, the internal combustion engine comprising a control system, the ignition system (T) further comprising a power source (30), at least one ignition coil (10, 11, 12) having at least one primary coil (L2, L4, L6) and one secondary coil (L3, L5, L7) for a spark plug (13, 14, 15) and a measurement device (50) for at least one of the parameters spark current, ion current, ignition voltage and primary voltage, said measurement device (50) being adapted to provide measurement signals to said control system for regulating the ignition system (T), the ignition system (T) also comprising means for transforming up voltage and storing energy, and a plurality of switches (S1-S7), said control system being adapted to control said switches (S1-S7), by means of said measuring signal(s), for the supply of adaptive spark energy and/or to control the polarity of the spark.Type: GrantFiled: April 11, 2013Date of Patent: May 31, 2016Assignee: SEM ABInventors: Jorgen Bengtsson, Bert Gustafsson
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Publication number: 20150136098Abstract: The following invention relates to an ignition coil assembly for an ignition system comprising an ignition coil where said assembly has a main axis and is configured for insertion into and/or removal out of a well associated with an internal combustion engine, wherein the assembly comprises an elongated extension body made of flexible material, said extension body comprising an upper end portion and a lower end portion wherein the extension body is arranged to be transversally bendable in relation to the main axis so that the upper end portion and the lower end portion may assume an angle (?) in relation to each other.Type: ApplicationFiled: May 14, 2013Publication date: May 21, 2015Applicant: SEM ABInventors: Lars-Ake Andersson, Jorgen Bengtsson, Bert Gustafsson
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Publication number: 20150032361Abstract: This invention relates to an engine for a vehicle using alternative fuel, preferably gas, comprising an engine (5) having a spark ignited ignition system (2) wherein said ignition system (2) includes misfire detection by means of a sensor device (4) providing information to a control system (20), connected to or within said ignition system (2), and wherein said combustion includes diluted operation to optimize emissions wherein said sensor device (4) includes an ion sensing measurement means (40) arranged to measure an ion current in said engine (5) and that said ignition system (2) has a built-in function to detect misfiring through an analysis of the ion current of the engine (5) during combustion.Type: ApplicationFiled: February 11, 2013Publication date: January 29, 2015Applicant: SEM ABInventors: Jõrgen Bengtsson, Lars-Åke Andersson, Bert Gustafsson
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Patent number: 6814055Abstract: A circuit to achieve a large ignition advance, limitation of speed of revolutions and to prevent backfiring and reverse direction running in a magnetic ignition system that comprises a flywheel with two poles and a two-legged iron core. An ignition transformer (L3/L4), a charging coil (L1) and a triggering coil (L2) that may be connected in antiphase to the charging coil are arranged on the first leg in the direction of rotation of the flywheel. A time-constant circuit (an RC net) and a control switch (T2) are arranged between the charging coil and a main switch (T1) that open/block triggering pulses such that charging takes place one revolution later than triggering. Limitation of the speed of revolutions is achieved with a time constant that can be determined.Type: GrantFiled: November 12, 2002Date of Patent: November 9, 2004Assignee: Sem ABInventors: Johan Kihlberg, Lars-Olof Ottosson
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Patent number: 6766787Abstract: A circuit to achieve a large ignition advance, limitation of speed of revolutions and to prevent backfiring and reverse direction running in a magnetic ignition system comprises a flywheel with two poles and a three-legged iron core. An ignition transformer (L3/L4), a triggering coil (L2) and a charging coil (L1) are arranged on the legs of the core. The triggering coil is arranged either on the first or second leg in the direction of rotation of the flywheel, and the charging coil on the final leg. A time-constant circuit (an RC net) and a control switch (T2) are arranged between the charging coil and a main switch (T1) that opens/blocks triggering pulses whereby limitation in the speed of revolutions is achieved by means of adjustment of the time-constant circuit.Type: GrantFiled: November 22, 2002Date of Patent: July 27, 2004Assignee: Sem ABInventors: Johan Kihlberg, Lars-Olof Ottosson
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Patent number: D726112Type: GrantFiled: November 27, 2013Date of Patent: April 7, 2015Assignee: SEM ABInventors: Lars-Åke Andersson, Jörgen Bengtsson, Bert Gustafsson