公开(公告)号：US20230387907A1

公开(公告)日：2023-11-30

申请号：US18031173

申请日：2021-09-09

Applicant: Hitachi Astemo, Ltd.

Inventor： Yuta MIFUNE ,  Koichi TSUKIO

IPC: H03K17/16 ,  H03K17/687

CPC classification number: H03K17/162 ,  H03K17/687 ,  H03K2217/0072

Abstract: A high-performance and highly reliable load driving device is provided that can quickly charge an ESD protection capacitor even at the time of load disconnection and complete all diagnoses of the driving system driver within a required time in a load driving device including a diagnosis circuit of a driving system driver and an ESD protection capacitor. A load driving device includes a load; a first switch element connected to the load and configured to control driving of the load; an ESD protection capacitor connected between the load and the first switch element; a charging circuit connected between the load and the first switch element and configured to charge the ESD protection capacitor; and a second switch element connected between the ESD protection capacitor and the charging circuit.

公开(公告)号：US20250146451A1

公开(公告)日：2025-05-08

申请号：US18835914

申请日：2022-11-10

Applicant: Hitachi Astemo, Ltd.

Inventor： Koichi TSUKIO

IPC: F02D41/20

Abstract: Provided is an electronic control device that drives and controls a fuel injection valve, the electronic control device increasing a boost current of a booster circuit only in a scene where boosting energy needs to be increased by short-time boosting, and reducing the boost current of the booster circuit in other scenes. The electronic control device including; a booster circuit; a boost setting controller that holds boost control information of the booster circuit; a boost controller that controls an energizing current of the booster circuit based on a current setting value from the boost setting controller; and a fuel injection circuit that supplies current to a fuel injection valve using voltage generated by the booster circuit, in which the boost setting controller reduces a boost speed of the booster circuit when information on engine temperature is higher than a predetermined value.

公开(公告)号：US20210359600A1

公开(公告)日：2021-11-18

申请号：US17284972

申请日：2019-09-19

Applicant: Hitachi Astemo, Ltd.

Inventor： Yuta MIFUNE ,  Koichi TSUKIO

IPC: H02M3/156 ,  H02H9/00 ,  H03K17/687 ,  F02D41/20 ,  F02D41/04 ,  F02M51/00 ,  B60R16/03

Abstract: A drive circuit is controlled when power is interrupted. When power is turned off, a main power supply is switched to a sub-power supply, and a residual charge of a step-up circuit is lowered to a drive voltage of a drive circuit using a step-down circuit is used as the sub-power supply.

公开(公告)号：US20220412281A1

公开(公告)日：2022-12-29

申请号：US17772968

申请日：2020-10-20

Applicant: HITACHI ASTEMO, LTD.

Inventor： Koichi TSUKIO

IPC: F02D41/20 ,  H03K17/12

Abstract: A large current flowing when energization by normal load drive control is performed at the time of a load short-circuit is prevented. A load drive device 100 includes drive switches 61 and 62 that turn on or off the current supplied from a power source to a load 70, a switch drive circuit 20 that transmits a drive signal to the drive switches 61 and 62 based on a control command from an arithmetic device 10, and a constant current source 40 that supplies the current to the load 70 without passing through the drive switches 61 and 62. Then, the switch drive circuit 20 performs control so as not to turn on either the drive switches 61 or 62 when the voltage between both ends of the load 70 becomes equal to or less than the determination value in a state where the drive switches 61 and 62 are turned off and in a state where the current is supplied from the constant current source 40 to the load 70.

公开(公告)号：US20220034275A1

公开(公告)日：2022-02-03

申请号：US17297314

申请日：2019-11-19

Applicant: Hitachi Astemo, Ltd.

Inventor： Koichi TSUKIO

IPC: F02D41/20 ,  F02D41/06

Abstract: Provided is a load drive device for controlling a fuel injection device for a vehicle engine and capable of checking an operation of the fuel injection device with high reliability without actually injecting fuel before starting the engine. The load drive device includes: a first switching element that is connected to a high-side of a load; a second switching element that is connected to a low-side of the load; a pre-driver circuit that transmits a drive instruction to the first switching element and the second switching element; and an arithmetic device that transmits a control instruction to the pre-driver circuit, in which a first monitor line and the second monitor line are connected to the arithmetic device, the first monitor line monitoring the drive instruction from the pre-driver circuit to the first switching element before starting an engine, and the second monitor line monitoring the drive instruction from the pre-driver circuit to the second switching element, and the pre-driver circuit has a first control mode in which the first switching element is turned off and the drive instruction is transmitted to the second switching element, and a second control mode in which the second switching element is turned off and the drive instruction is transmitted to the first switching element.