公开(公告)号：US20220103068A1

公开(公告)日：2022-03-31

申请号：US17397109

申请日：2021-08-09

Applicant: Hitachi Astemo, Ltd.

Inventor： Atsushi OGAWA ,  Motoaki KATO ,  Kengo NOMURA

IPC: H02M3/156 ,  H01F7/06 ,  F02M51/06 ,  F02D41/20

Abstract: There is provided a transformation control device of a transformation chopper circuit that transforms an input by turning on and off a current using a switch and outputs the transformed input. The transformation control device controls at least an ON/OFF state of a main switch by acquiring an output voltage of the transformation chopper circuit in a case where the main switch is in an ON state, the main switch being turned on in a case where energy is accumulated in an inductor.

公开(公告)号：US20220099209A1

公开(公告)日：2022-03-31

申请号：US17391568

申请日：2021-08-02

Applicant: Hitachi Astemo, Ltd. ,  Nuvoton Technology Corporation Japan

Inventor： Atsushi OGAWA ,  Motoaki KATO ,  Kengo NOMURA ,  Keisuke KURODA ,  Makoto KAWAJIRI

IPC: F16K31/06 ,  F02D41/20 ,  F02M47/02

Abstract: An electromagnetic valve drive device which supplies a hold current with a prescribed fluctuation range to an electromagnetic coil of an electromagnetic valve after a current peak when a supply of electricity starts has passed includes: a power supplier which intermittently applies a drive voltage to the electromagnetic coil; a detector which detects the hold current; a first comparator which compares a detected current by the detector with a first threshold value; a filter which performs integration processing on an output of the first comparator; a second comparator which compares an output of the filter with a second threshold value to generate an output signal used for generating a control signal for controlling the power supplier; and a control signal generator which generates the control signal for controlling the power supplier based on the output signal of the second comparator, wherein the filter is a count-up/down type digital filter.

公开(公告)号：US20220099042A1

公开(公告)日：2022-03-31

申请号：US17487444

申请日：2021-09-28

Applicant: Hitachi Astemo, Ltd. ,  Nuvoton Technology Corporation Japan

Inventor： Motoaki KATO ,  Atsushi OGAWA ,  Kengo NOMURA ,  Keisuke KURODA

IPC: F02D41/20

Abstract: An electromagnetic valve driving device that drives an electromagnetic valve for injecting a fuel, includes: a first charging route that charges a bootstrap capacitor from a battery without intervention of a boost circuit; a second charging route that charges the bootstrap capacitor from the boost circuit; and a switching control unit that switches a charging route for charging the bootstrap capacitor to the first charging route or the second charging route.