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1. 发明授权

US11635472B2 Load driving device 有权
公开(公告)号：US11635472B2
公开(公告)日：2023-04-25
申请号：US17054973
申请日：2019-02-14
申请人： HITACHI AUTOMOTIVE SYSTEMS, LTD.
发明人： Yuri Ohara , Yasushi Sugiyama , Takeo Yamashita , Masahiro Doi
IPC分类号： B60W20/00 , G01R31/50 , B60W20/50 , B60W50/02 , H02P29/024
摘要： A load driving device includes a synchronous rectifier circuit having a driving-side switching element and a reflux-side switching element; a driver control circuit controls the synchronous rectifier circuit; and a voltage monitor circuit that monitors whether the voltage of an output terminal of the synchronous rectifier circuit is within a predetermined voltage range; where the driver control circuit, upon receiving a diagnosis command, performs control so that when the driving-side switching element is switched from ON to OFF, the reflux-Side switching element is also switched to OFF; and the voltage monitor circuit detects a normal state when the voltage to be monitored is within a normal level during a period in which both the driving-side switching element and the reflux-side switching element are turned OFF.

2. 发明授权

US11459996B2 Electronic control unit 有权
公开(公告)号：US11459996B2
公开(公告)日：2022-10-04
申请号：US17274228
申请日：2019-08-08
申请人： Hitachi Automotive Systems, Ltd.
发明人： Yuri Ohara , Yasuo Shima , Masahiro Doi , Takeo Yamashita
IPC分类号： H01H47/00 , F02P17/00 , G01R31/00 , H01F7/06
摘要： Provided is an electronic control unit capable of performing a high-accurate failure diagnosis in a short time as an electronic control unit having a failure diagnosis function. A load drive circuit that drives a load, a control circuit that controls the load drive circuit, and a diagnosis circuit that diagnoses an output state of the load drive circuit and outputs a diagnostic result to the control circuit are provided. The diagnosis circuit outputs a diagnosis completion flag indicating whether or not there is a diagnosis opportunity to the control circuit.

3. 发明授权

US11008988B2 Electronic control device and abnormality/normality determination method of electronic control device 有权
公开(公告)号：US11008988B2
公开(公告)日：2021-05-18
申请号：US16487382
申请日：2018-01-29
申请人： HITACHI AUTOMOTIVE SYSTEMS, LTD.
发明人： Yasushi Sugiyama , Atsushi Arata , Yasuo Shima , Masahiro Doi
IPC分类号： F02M51/00 , F02D41/22 , F02M51/06
摘要： An electronic control device has a compact abnormality detection circuit that does not require a complicated circuit, and is capable of suppressing a cost increase when being applied a direct injection injector drive circuit and other drive circuits. A current detection circuit includes a current detection resistor, a differential amplifier, and a current detection unit. The current detected is supplied to the abnormality/normality determination unit. A combined resistance value of a diagnostic current drive circuit and the current detection resistor is higher than an injector drive circuit. A fuel injection signal is input to a logic circuit, and a fuel cut signal is input to a different terminal of the logic circuit. The logic circuit's output terminal is connected to the injector drive circuit's gate. The output signal from a fuel injection signal output unit is supplied via a switch to the diagnostic current drive circuit's gate.

4. 发明授权

US10833688B2 Electronic control device 有权
公开(公告)号：US10833688B2
公开(公告)日：2020-11-10
申请号：US16610321
申请日：2018-04-11
申请人： Hitachi Automotive Systems, Ltd.
发明人： Masahiro Doi , Atsushi Arata
IPC分类号： H03M1/12 , H03M1/06 , G05F1/575
摘要： An inexpensive electronic control device is implemented that enables a power supply voltage supplied to a microcomputer to be varied using a simple method and that enables an identical power supply to be adapted to various microcomputers. A switch is turned on to determine the value of a discrete resistor, and a voltage based on the value of current from a current source and the resistance value of the discrete resistor is caused in an In1 terminal. By an A/D converter, the In1 terminal voltage is subjected to A/D conversion, and a digital code corresponding to the selectively connected discrete resistor is detected. The result of the A/D conversion is saved in a register, and the determination of the resistance value of the discrete resistor performed by the A/D converter is completed. After the completion of the resistance value determination performed by the A/D converter, power supply voltages start activation. The core voltage activates to secure a voltage corresponding to a reference voltage set by the register and thereby a desired power supply is completed.

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