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公开(公告)号：US20180026532A1
公开(公告)日：2018-01-25
申请号：US15498690
申请日：2017-04-27
Applicant: DENSO CORPORATION
Inventor： Yuta MIZUNO
IPC: H02M3/156
CPC classification number: H02M3/156 , H02M2003/1555
Abstract: A load driving control apparatus calculates current slopes in an on-period and an off-period in one PWM cycle period, respectively, by using actual currents at a start time point and an end time point of the PWM cycle period as well as two sets of data, as data including a duty ratio corresponding to the actual current values. The data is so determined that the actual current data value of predetermined one of the start time point and the end time point is within a learning area. The duty ratio is calculated based on a difference between a target current value and the actual current value until calculation of the current slopes and is completed. The duty ratio is calculated based on the current slopes, the actual current value at start time point and a target current value after the calculation of the current slopes is completed. Since an actual current change characteristic is calculated based on the actual current values and the duty ratio is calculated based on the current change characteristic, robustness is enhanced.
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公开(公告)号：US20160131248A1
公开(公告)日：2016-05-12
申请号：US14926040
申请日：2015-10-29
Applicant: DENSO CORPORATION
Inventor： Yuta MIZUNO , Fuminori SUZUKI
CPC classification number: F16H61/0021 , F16H61/0202 , F16H61/12 , F16H2059/683 , F16H2061/1208 , F16H2061/1224 , F16H2061/1264
Abstract: An electronic control unit that is used in an automatic transmission to regulate oil circulation. The electronic control unit includes a switcher that supplies an electric current to a linear solenoid, a current detector that detects an actual electric current value of the solenoid, a target current calculator that calculates a target electric current value, a feedback controller that sets a duty ratio to match the actual electric current value to the target electric current value and to generate a Pulse Width Modulation (PWM) signal having the set duty ratio, and a corrector that determines whether a coupled oscillation has occurred by obtaining oil pressure information of the hydraulic circuit and to correct the PWM signal when determining that the vibration has occurred.
Abstract translation: 一种用于自动变速器调节油循环的电子控制单元。 电子控制单元包括向线性电磁线圈提供电流的切换器，检测螺线管的实际电流值的电流检测器，计算目标电流值的目标电流计算器，设定值的反馈控制器 比率以将实际电流值与目标电流值相匹配，并产生具有设定占空比的脉宽调制（PWM）信号，以及校正器，其通过获得液压的油压信息来确定是否发生耦合振荡 并在确定发生振动时校正PWM信号。
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公开(公告)号：US20180328514A1
公开(公告)日：2018-11-15
申请号：US15837094
申请日：2017-12-11
Applicant: DENSO CORPORATION
Inventor： Yuta MIZUNO
CPC classification number: F16K31/002 , F16H61/0021 , F16H61/0251 , F16H2061/0255 , F16K3/24 , F16K31/0675 , H01F7/064 , H01F7/1844 , H01F2007/1888
Abstract: A current control circuit controls a linear solenoid valve provided in an oil pressure circuit to feed back an output oil pressure. The current control circuit includes a PWM signal generation part, a target setting part, a duty ratio setting part and a vibration detection circuit. The target setting part sets a target current value, which is a target value of an excitation current of the linear solenoid valve and periodically varies with a predetermined dither amplitude and a dither period longer than a pulse period of the PWM signal. The self-excited vibration detection part calculates a phase difference between the target current value and an actual current value and detects a presence of self-excited vibration because of a resonance of a feedback of the output oil pressure and driving of the linear solenoid valve in the dither period when the phase difference decreases relative to an increase in the target current value or the phase difference increases relative to a decrease in the dither period.
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