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公开(公告)号：US20220252033A1
公开(公告)日：2022-08-11
申请号：US17486422
申请日：2021-09-27
发明人： Kiseon Sim , Dongwon Jung , Won Gyu Kim , Jin Oh Song , Soo Hyung Woo
摘要： An ignition coil control system may include a first ignition coil including a primary coil and a secondary coil; a first switch that selectively electrically-connects the primary coil of the first ignition coil; a second ignition coil including a primary coil and a secondary coil; a second switch that selectively electrically-connects the primary coil of the second ignition coil; a pair of electrodes generating spark discharge by a discharge current generated in the first ignition coil and the second ignition coil; and an ignition controller that controls spark discharge of the pair of electrodes by adjusting an amount and a duration of the discharge current of the first ignition coil and the second ignition coil by turning the first switch and the second switch on or off according to a single pulse signal having a constant voltage including different voltages transmitted from an engine control unit (ECU).
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公开(公告)号：US20220010762A1
公开(公告)日：2022-01-13
申请号：US17293735
申请日：2019-12-23
申请人： Hitachi Astemo, Ltd.
发明人： Kazuhiro ORYOJI , Yoshihiko AKAGI , Hidefumi IWAKI
摘要： Due to changes in a flow of an air-fuel mixture in a cylinder, reliable ignition due to spark discharge may not be possible. Therefore, an ignition control unit 24 includes a secondary voltage calculation unit 31 that calculates an average value of a secondary voltage generated on a secondary side of an ignition coil, an irregular flow ratio calculation unit 32 that calculates a ratio of cycles in which the average value of the secondary voltage is equal to or less than a set average value with respect to a cycle of the internal combustion engine in a predetermined period as an irregular flow ratio indicating that the flow of the air-fuel mixture in the cylinder is irregular, and an ignition operation amount correction unit 37 that corrects an ignition operation amount so that the irregular flow ratio is equal to or less than the set ratio value that is the target to be reached of the irregular flow ratio.
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公开(公告)号：US20210123408A1
公开(公告)日：2021-04-29
申请号：US17055271
申请日：2019-02-08
摘要： An ignition coil control device includes: an energization control unit that controls to energize an ignition coil by first energization control and second energization control shorter in energization time than the first energization control; a cruise area determination unit that determines that a driving area of a vehicle is located in a cruise area on the basis of a throttle opening and an engine speed; and an integration counter that is incremented every predetermined time when the first energization control is being executed in the cruise area and is decremented every predetermined time in other cases. When a counter value of the integration counter reaches an upper limit value, a cooling process of switching from the first energization control to the second energization control is executed. Such ignition coil control device can appropriately switch energization time while preventing excessive heating of an ignition coil without using a current sensor.
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公开(公告)号：US10907607B2
公开(公告)日：2021-02-02
申请号：US16513984
申请日：2019-07-17
发明人： Yasuhiro Nodake
摘要： A current control circuit for an ignition system (i.e., igniter current limiter) is disclosed. The current control circuit can reduce a coil current over a soft shut down (SSD) period using an insulated gate bipolar transistor (IGBT) that is controlled by a negative feedback loop, which controls the current limit of the IGBT according to a SSD profile. In order to prevent an unwanted current rise during the soft shut down period, the current control circuit compares a gate voltage of the IGBT to a reference signal and based on the comparison can enable the SSD profile to include a fast ramp. The fast ramp quickly lowers the current limit of the IGBT so that the coil current equals the current limit and can be controlled by the negative feedback loop.
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公开(公告)号：US20200340441A1
公开(公告)日：2020-10-29
申请号：US16513984
申请日：2019-07-17
发明人： Yasuhiro NODAKE
IPC分类号： F02P11/06 , H03K17/082 , F02P3/045 , F02P3/055 , F02D41/22
摘要： A current control circuit for an ignition system (i.e., igniter current limiter) is disclosed. The current control circuit can reduce a coil current over a soft shut down (SSD) period using an insulated gate bipolar transistor (IGBT) that is controlled by a negative feedback loop, which controls the current limit of the IGBT according to a SSD profile. In order to prevent an unwanted current rise during the soft shut down period, the current control circuit compares a gate voltage of the IGBT to a reference signal and based on the comparison can enable the SSD profile to include a fast ramp. The fast ramp quickly lowers the current limit of the IGBT so that the coil current equals the current limit and can be controlled by the negative feedback loop.
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公开(公告)号：US20200291915A1
公开(公告)日：2020-09-17
申请号：US16355033
申请日：2019-03-15
申请人： Caterpillar Inc.
发明人： James J. Cress
摘要： An ignition system for an internal combustion engine includes an ignition coil forming a part of a primary circuit and a secondary circuit, a power source to supply power to the ignition coil, and a controller to determine whether the ignition coil is a recognized ignition coil based on a measured risetime and a measured current level in the primary circuit, the measured current level being lower than that required to create a breakdown voltage of the ignition coil.
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公开(公告)号：US10697383B2
公开(公告)日：2020-06-30
申请号：US15520178
申请日：2015-09-04
发明人： Shinji Nakagawa , Toshio Hori
IPC分类号： F02D41/00 , F02P9/00 , F02D41/14 , F02P5/15 , F02D37/02 , F02D43/00 , F02D19/02 , F02D19/10 , F02D41/28 , F02P3/045 , F02P5/152 , F02D21/08
摘要： The present invention suppresses the worsening of stability due to a variation in EGR amounts between cylinders in a spark ignition engine. An engine control device for controlling a spark ignition engine equipped with an EGR means for recirculating exhaust gas in a combustion chamber and an air-fuel-ratio detection means for detecting the air-fuel ratio in each cylinder, the engine control device being characterized by being equipped with a means for changing the parameters for ignition control of a rich cylinder, when the air-fuel ratio of cylinders varies and there are richer cylinders and leaner cylinders relative to a prescribed air-fuel ratio during the execution of exhaust gas recirculation by the EGR means.
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公开(公告)号：US10519922B2
公开(公告)日：2019-12-31
申请号：US16156567
申请日：2018-10-10
发明人： Justin Cartwright , Kirk Pulay
摘要： Methods and systems are provided for determining an ignition coil dwell time based on an estimated ignition coil temperature. In one example, a method may include estimating the ignition coil temperature based on heat transfer between engine and the ignition coil, heat transfer between ambient and the ignition coil, and internal resistive heating of the ignition coil.
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公开(公告)号：US10138862B2
公开(公告)日：2018-11-27
申请号：US15359395
申请日：2016-11-22
发明人： Justin Cartwright , Kirk Pulay
摘要： Methods and systems are provided for determining an ignition coil dwell time based on an estimated ignition coil temperature. In one example, a method may include estimating the ignition coil temperature based on heat transfer between engine and the ignition coil, heat transfer between ambient and the ignition coil, and internal resistive heating of the ignition coil.
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公开(公告)号：US09957946B2
公开(公告)日：2018-05-01
申请号：US15468424
申请日：2017-03-24
申请人： DENSO CORPORATION
发明人： Shota Kinoshita , Akimitsu Sugiura , Kaori Doi , Fumiaki Aoki
IPC分类号： F02P3/00 , F02P13/00 , H05H1/46 , F02P3/05 , F02P9/00 , F02P15/10 , F02P3/045 , F02P15/00 , F02P17/12 , H05H1/52
CPC分类号： F02P13/00 , F02P3/0456 , F02P3/05 , F02P3/053 , F02P9/002 , F02P15/005 , F02P15/10 , F02P17/12 , H05H1/46 , H05H1/52
摘要： An ignition device includes a spark plug, a measurement value detector, an electrical breakdown determiner, an AC voltage applying section, and a first changing section. The measurement value detector includes primary and secondary coils, and detects at least one measurement value among an ignition coil, a primary current, a primary voltage, a secondary current, and a secondary voltage. The electrical breakdown determiner determines whether a discharge has become an electrical breakdown state based on the measurement value. The AC voltage applying section applies an AC voltage of a first predetermined frequency that causes voltage resonance to the primary coil. The first changing section changes the frequency of the AC voltage to a second predetermined frequency that can maintain the electrical breakdown state and is lower in frequency than the first predetermined frequency when it is determined that the discharge has become the electrical breakdown state.
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