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公开(公告)号：US10367427B2
公开(公告)日：2019-07-30
申请号：US16163937
申请日：2018-10-18
申请人： DENSO CORPORATION
发明人： Shoichi Takemoto , Hideo Naruse
IPC分类号： H03M7/42 , H02M7/48 , H02M1/08 , H02M7/53846 , H02M1/00
摘要： In a resonant inverter device, a main circuit is configured to convert input power supplied from a direct-current (DC) power source into alternating-current (AC) power and supply the AC power to a resonance load as output power, and a controller is configured to control operations of the main circuit. In the controller, a deriver is configured to derive a power loss or circuit efficiency of the main circuit as a conversion loss parameter of the main circuit, and an input power calculator is configured to calculate an increased target output value by increasing the target output value using the conversion loss parameter, as a target value of input power that is input to the main circuit. In the controller, an operation controller is configured to control operations of the main circuit such that the calculated target value of the input power is input to the main circuit.
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公开(公告)号：US10119879B2
公开(公告)日：2018-11-06
申请号：US15498768
申请日：2017-04-27
申请人： DENSO CORPORATION
发明人： Shoichi Takemoto , Shuichi Nakano , Nobuyuki Abe , Kenji Ito
IPC分类号： G01L23/10
摘要： A strain sensor is provided which includes a strain sensor, a first housing, a second housing joined to the first housing, and a pressure measuring mechanism firmly retained between the first housing and the second housing. The pressure measuring mechanism is gripped between a first face of the first housing and a second face of the second housing to measure compressive stress exerted by a cylinder head of an internal combustion engine on the first housing and the second housing. This structure improves the reliability of mechanical strength of the housings and the pressure measuring mechanism and provides flexibility in selecting the type of the pressure measuring mechanism.
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公开(公告)号：US11070147B2
公开(公告)日：2021-07-20
申请号：US16776953
申请日：2020-01-30
申请人： DENSO CORPORATION
发明人： Shoichi Takemoto
IPC分类号： H02M7/48 , H02M7/537 , H02M7/5387
摘要： A resonant inverter apparatus supplies a high AC voltage to a discharge load. In this apparatus, an inverter circuit converts a DC voltage to an AC voltage using a plurality of switching elements. A transformer steps up the AC voltage and generates a high AC voltage. A DC voltage detecting unit detects a value of a DC voltage supplied to the inverter circuit. A control unit generates a driving pulse for performing on/off switching of the switching elements. The switching elements include first and second switching elements. The control unit performs phase angle control of the driving pulse. In response to the detected value of the DC voltage being greater than a reference value, the control unit sets a switching phase angle of the second switching element relative to the first switching element serving as reference, based on the magnitude of the valued of the DC voltage.
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公开(公告)号：US10012558B2
公开(公告)日：2018-07-03
申请号：US15343456
申请日：2016-11-04
申请人： DENSO CORPORATION
发明人： Shoichi Takemoto , Syuichi Nakano , Nobuyuki Abe , Kenji Ito , Takashi Furukawa
CPC分类号： G01L9/008 , F23Q7/001 , F23Q2007/002 , F23Q2007/005 , G01L23/10
摘要： In a combustion pressure sensor, a sensor holder is installed in a housing. The sensor holder has an end contact surface. A load transfer member is installed in the housing. The load transfer member has a contact surface facing the end contact surface of the sensor holder. The contact surface of the load transfer member is in contact with the end contact surface of the sensor holder. One of the contact surface of the load transfer member and the end contact surface of the sensor holder has a concavely curved shape, and the other thereof has a convexly curved shape.
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公开(公告)号：US11614232B2
公开(公告)日：2023-03-28
申请号：US16418112
申请日：2019-05-21
申请人： DENSO CORPORATION
发明人： Shoichi Takemoto , Nobuyuki Abe , Kenji Ito
摘要： On an inner wall surface of a plug hole, an internal thread portion and a seat portion are formed. The seat portion has a tapered seat surface. A glow plug with a combustion pressure sensor includes a housing, a glow heater, a load transfer member, and a pressure detector. The housing has an external thread and a seat facing portion. The seat facing portion has a tapered contact surface in surface contact with the tapered seat surface. A recessed portion recessed to be in non-contact with the seat portion is formed annularly about a central axis of the housing.
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公开(公告)号：US10381807B2
公开(公告)日：2019-08-13
申请号：US16204006
申请日：2018-11-29
申请人： DENSO CORPORATION
发明人： Shoichi Takemoto
摘要： In a discharge generator, a control unit switchably performs a continuous mode and a burst mode based on determination of whether target output power is higher than discharge start power. The burst mode alternately performs a discharge mode and a non-discharge mode. The control unit causes a burst ratio to be set to a value expressed by the following equation b=Po*/Pfs0 where b represents the burst ratio, Po* represents the target output power, and Pfs0 represents the discharge start power. The burst ratio is defined as a ratio of the discharge period to a burst period. The burst period is the sum of the discharge period and the stop period. The control unit causes, in the burst mode, the switch circuit to output, as the output power, the discharge start power during the discharge period.
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公开(公告)号：US10312826B2
公开(公告)日：2019-06-04
申请号：US16135039
申请日：2018-09-19
申请人： DENSO CORPORATION
摘要： In a power conversion apparatus, a controller calculates a duty ratio being a ratio of an on-duration of each of bridge-circuit switches configured by first to fourth switches to a switching period, and outputs a gate signal to each of the bridge-circuit switches. The controller adjusts the duty ratio of each of the bridge-circuit switches such that a switch-current difference becomes closer to a value obtained by multiplying an input-current difference by the predetermined target ratio that is a value greater than 0 and less than 1. The switch-current difference is a difference between a first switch current and a second switch current or a difference between a third switch current and a fourth switch current detected by a switch-current sensor at predetermined timings in the switching period. The input-current difference is a difference between input currents detected by an input-current sensor simultaneously with detection timings of switch currents.
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公开(公告)号：US20190273447A1
公开(公告)日：2019-09-05
申请号：US16288493
申请日：2019-02-28
申请人： DENSO CORPORATION
摘要： In a discharge generator, a switch is connected to a DC power source, and a transformer includes a primary coil connected to the switch, and a secondary coil magnetically coupled to the primary coil and connected to a discharge load. A power measuring unit measures input power supplied from the direct-current power source. A control unit controls on-off switching operations of the switch to thereby convert an input direct-current voltage to an alternating-current voltage. The control unit changes a switching frequency of the on switching operations of the switch while performing an analysis of a frequency characteristic of the input power based on change of the switching frequency. The control unit determines whether the discharge load is a normal state or at least one of predetermined failure modes has occurred in the discharge load in accordance with a result of the analysis of the frequency characteristic of the input power.
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公开(公告)号：US10862403B2
公开(公告)日：2020-12-08
申请号：US16745918
申请日：2020-01-17
申请人： DENSO CORPORATION
摘要： A power inversion apparatus includes a smoothing capacitor, first and second primary coils, a secondary coil, first to fourth switches of bridge circuit switches, a clamp capacitor, and a switch controller. The switch controller calculates a lower-arm duty ratio of each of the first and second switches using a map or a mathematical expression by feed-forward control based on an input voltage. The switch controller outputs a fixed value that is equal to or greater than a maximum value of the lower-arm duty ratio within a variation range of the input voltage as an upper-arm duty ratio of each of the third and fourth switches. The switch controller generates a pulse width modulation signal based on the calculated lower-arm duty ratio and the fixed value of the upper-arm duty ratio, and outputs the pulse width modulation signal to the bridge circuit switches.
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