公开(公告)号：US20210388791A1

公开(公告)日：2021-12-16

申请号：US17341981

申请日：2021-06-08

Applicant: DENSO CORPORATION

Inventor： Masashi INABA

IPC: F02D41/20

Abstract: An injection control device includes: a boost controller charging a boost capacitor by performing a boost switching control of a boost switch, and supplying a boost power from a battery power source; and a boost voltage monitor monitors a boost voltage. The boost controller measures a number of times of when the boost voltage becomes equal to or higher than a predetermined value due to a boost current flowing into the boost capacitor, causing a jump of the boost voltage during a time between a start and stop of boosting, and determines deterioration of the boost capacitor by comparing the measured number of times (i.e., the number of jumps) with a predetermined number of times.

公开(公告)号：US20210071609A1

公开(公告)日：2021-03-11

申请号：US17014302

申请日：2020-09-08

Applicant: DENSO CORPORATION

Inventor： Masashi INABA ,  Yuusuke SHIMIZU

IPC: F02D41/20 ,  F02D41/30 ,  F02D41/00 ,  F02M51/00

Abstract: An energization instruction switch switches energization instruction signals to instruct energization of fuel injection valves. A first cylinder designation switch designates one of the energization instruction signals to designate a valve closing detection cylinder. A valve closing detection unit monitors downstream voltage of the fuel injection valve to detect occurrence of an inflection point in change of the downstream voltage to detect a valve closing. A second cylinder designation switch designates one of the downstream voltages and designates the valve closing detection cylinder. A valve closing time measuring unit measures a valve closing time, which is from a switching timing of the energization instruction signal from ON to OFF to a valve closing detection timing, for injection of the valve closing detection cylinder. A valve closing time learning unit learns the valve closing time measured by the valve closing time measuring unit.

公开(公告)号：US20200072153A1

公开(公告)日：2020-03-05

申请号：US16529341

申请日：2019-08-01

Applicant: DENSO CORPORATION

Inventor： Masashi INABA

IPC: F02D41/34 ,  F02D41/30

Abstract: An injection control device has a current supply controller controlling a supply of an electric current for opening and closing a fuel injection valve, a current monitor monitoring the electric current supplied to the valve, and a boost controller performing a boost voltage generation control that generates a boost voltage from a power supply voltage by a tuning ON/OFF of a switching element for supplying a peak current to open the valve. When the current supply controller supplies the peak current to the fuel injection valve, the boost controller stops the boost voltage generation control in a stop period that includes a timing when an electric current supply amount takes a threshold value of the peak current.

公开(公告)号：US20190326044A1

公开(公告)日：2019-10-24

申请号：US16382438

申请日：2019-04-12

Applicant: DENSO CORPORATION

Inventor： Masashi INABA ,  Noboru NAGASE ,  Taichi WATANABE

IPC: H01F7/06 ,  F02M51/00

Abstract: An injection control device controls a solenoid in a fuel injection valve. The injection control device includes a transistor on an upstream side of a first power supply path to the solenoid, and a transistor on an upstream side of a second power supply path to the solenoid. The injection control device has another transistor with a body diode arranged in parallel at a position between an upstream terminal of the solenoid and ground. The injection control device also includes a transistor on the downstream side of the first and second power supply paths. A drive controller in the injection control device drives the solenoid to an open position by switching ON the transistor on the downstream side and one of the transistors on the upstream side power supply paths.

公开(公告)号：US20210071610A1

公开(公告)日：2021-03-11

申请号：US17014303

申请日：2020-09-08

Applicant: DENSO CORPORATION

Inventor： Masashi INABA

IPC: F02D41/24 ,  F02D41/20

Abstract: A first switch designates one of energization instruction signals to designate a valve closing detection cylinder. A valve closing detection unit monitors downstream voltages of the fuel injection valves to detect occurrence of an inflection point in change of the downstream voltages and detects valve closing. A second switch designates one of the downstream voltages and designates the valve closing detection cylinder. A stage number designation unit designates a valve closing detection stage number. A valve closing time measuring unit measures a valve closing time, which is from a switching timing at which the energization instruction signal is switched from ON to OFF to a valve closing detection timing of the valve closing, for injection of the valve closing detection stage number of the valve closing detection cylinder. A valve closing time learning unit learns the valve closing time measured by the valve closing time measuring unit.

公开(公告)号：US20190323447A1

公开(公告)日：2019-10-24

申请号：US16382388

申请日：2019-04-12

Applicant: DENSO CORPORATION

Inventor： Masashi INABA ,  Noboru NAGASE ,  Taichi WATANABE

IPC: F02D41/36 ,  F02M21/02 ,  F02D41/20 ,  F02D41/24

Abstract: An injection control device controls a solenoid in a fuel injection valve. The injection control device includes a transistor on an upstream side of a first power supply path to the solenoid and a transistor on an upstream side of a second power supply path to the solenoid. The injection control device has another transistor with a body diode arranged in parallel at a position on the first power supply path between the first transistor and an upstream terminal of the solenoid. The injection control device also includes a transistor on the downstream side of the first and second power supply paths. A drive controller in the injection control device drives the solenoid to an open position by switching ON the transistor on the downstream side and the transistor on the upstream side of the first power supply path or the transistor on the upstream side of the second power supply path.

公开(公告)号：US20210372337A1

公开(公告)日：2021-12-02

申请号：US17330698

申请日：2021-05-26

Applicant: DENSO CORPORATION

Inventor： Kouyou YOSHIKAWA ,  Masashi INABA

IPC: F02D41/20 ,  F02M51/06 ,  F02D41/38

Abstract: When injecting fuel from a fuel injection valve by energizing thereof, an energization time correction amount calculator performs an area correction of an electric current flowing in the fuel injection valve, and calculates an energization time correction amount. An injection instruction state determiner determines an inter-cylinder injection instruction interval among cylinders which inject fuel in series or determines an injection instruction overlapping state. An upper guard value setter sets an upper guard value of the energization time correction amount based on the inter-cylinder injection instruction state determined by the injection instruction state determiner.

公开(公告)号：US20210164413A1

公开(公告)日：2021-06-03

申请号：US17104276

申请日：2020-11-25

Applicant: DENSO CORPORATION

Inventor： Masashi INABA

IPC: F02D41/20 ,  F02D41/38

Abstract: An injection control device controls the opening and dosing of a fuel injection valve by performing peak current drive and constant current drive and controls injection of fuel from the fuel injection valve to an internal combustion engine. The injection control device includes a preheat current energization control unit configured to, when a temperature of a solenoid coil of the fuel injection valve prior to starting the internal combustion engine is lower than a predetermined temperature, energize the fuel injection valve with a preheat current having an output density that causes the temperature of the solenoid coil to increase, the preheat current being within a range that maintains the fuel injection valve in a valve closed state, and when the temperature of the solenoid valve increases to or above the predetermined temperature, stop the energization of the fuel injection valve with the preheat current.

公开(公告)号：US20210164412A1

公开(公告)日：2021-06-03

申请号：US17104120

申请日：2020-11-25

Applicant: DENSO CORPORATION

Inventor： Masashi INABA

IPC: F02D41/20 ,  F02D41/40

Abstract: An injection control device controls the opening and dosing of a fuel injection valve by performing peak current drive and constant current drive with respect to the fuel injection valve and controls injection of fuel from the fuel injection valve to an internal combustion engine. The injection control device includes an energization control unit that performs constant current switching control of an energization current to the fuel injection valve. The energization control unit is configured to, when the energization current to the fuel injection valve is to be stopped, controls an energization stop timing of the energization current such that a flyback period is equal to a first predetermined time period.

公开(公告)号：US20190323466A1

公开(公告)日：2019-10-24

申请号：US16382549

申请日：2019-04-12

Applicant: DENSO CORPORATION

Inventor： Masashi INABA ,  Noboru NAGASE ,  Taichi WATANABE

IPC: F02M59/46

Abstract: An injection control device controls a drive of a solenoid in a high pressure pump for pressurizing fuel to an internal combustion engine. The injection control device includes a transistor on an upstream side of a power supply path from a direct current power supply line to the solenoid and a transistor provided on a downstream side of the power supply path. The injection control device further includes a diode at a position between an upstream terminal of the solenoid and ground, a transistor arranged in parallel with the diode, and a drive controller. The drive controller drives the solenoid to an open position by switching ON the transistors on the upstream and downstream sides of the power supply path.