公开(公告)号：US11268468B2

公开(公告)日：2022-03-08

申请号：US17062953

申请日：2020-10-05

Applicant: DENSO CORPORATION

Inventor： Makoto Tanaka ,  Masatake Wada

IPC: F02D41/14

Abstract: An air-fuel ratio control device sets a target air-fuel ratio and performs an air-fuel ratio control based on the target air-fuel ratio for an engine of a spark ignition type. The air-fuel ratio control device includes a lean combustion determination unit that determines whether a lean combustion is performed in the engine at the target air-fuel ratio, the target air-fuel ratio being set leaner than the theoretical air-fuel ratio; a target NOx setting unit that sets a target NOx concentration according to an operation state of the engine; an acquisition unit that acquires an actual NOx concentration detected by using a NOx concentration detection unit in an exhaust passage of the engine; and a correction unit that corrects the target air-fuel ratio based on the target NOx concentration and the actual NOx concentration when determination is made that lean combustion is performed.

公开(公告)号：US11149598B2

公开(公告)日：2021-10-19

申请号：US16751870

申请日：2020-01-24

Applicant: DENSO CORPORATION

Inventor： Masayuki Niwa ,  Makoto Saizen ,  Makoto Tanaka

IPC: F02M51/06 ,  F01L9/20 ,  F02P5/145 ,  F16K31/06 ,  F02D41/40 ,  F01L9/21

Abstract: A fuel injection control device includes an additional energization unit. Concerning an undershoot state caused by a first energization for fuel injection, a return period is an estimated period required for a movable core to return to an initial position from a first energization. An injection interval ranges from the first energization to a second energization that is for a next fuel injection. An allowable period is obtained by subtracting a rise period estimated for the second energization from the return period. The additional energization unit adds an additional energization between the first energization and the second energization when the injection interval is longer than or equal to the allowable period and is shorter than or equal to the return period.

公开(公告)号：US11286873B2

公开(公告)日：2022-03-29

申请号：US17340421

申请日：2021-06-07

Applicant: DENSO CORPORATION

Inventor： Makoto Tanaka ,  Masatake Wada

IPC: F02D41/02 ,  F02D41/20 ,  F02D41/24 ,  F02D41/14

Abstract: A control device includes a drive unit configured to supply electric power to a fuel injection valve to perform valve open drive to supply fuel to a combustion chamber of an internal combustion engine; and a correction unit configured to correct a fuel injection amount of the fuel injection valve. The correction unit is configured to learn the fuel injection amount of the fuel injection valve when NOx purge is performed to reduce and purify the NOx occlusion catalyst.

公开(公告)号：US10718287B2

公开(公告)日：2020-07-21

申请号：US15751272

申请日：2016-08-25

Applicant: DENSO CORPORATION

Inventor： Makoto Tanaka ,  Syohei Fujita

IPC: F02D41/20 ,  F02M51/00 ,  F02M61/10 ,  F02M51/06 ,  F02D41/40 ,  F02D41/34 ,  F02D41/36 ,  F02D45/00 ,  F02D41/14 ,  F16K31/06

Abstract: An injection control device controls a fuel injection valve driven by an electric power. The injection control device includes a current detection unit to detect a driving current supplied to a solenoid of the fuel injection valve, an identification unit to identify a theoretical model of the driving current in a state where a movable core moved by an electromagnetic force generated by the solenoid is at rest, and a state detection unit to detect a state of the movable core. The state detection unit detects the state of the movable core, based on a deviation between the driving current detected by the current detection unit and the theoretical model.

公开(公告)号：US10144435B2

公开(公告)日：2018-12-04

申请号：US15686684

申请日：2017-08-25

Applicant: DENSO CORPORATION

Inventor： Kenji Sogo ,  Takashi Naoi ,  Makoto Tanaka ,  Kazutoshi Shiomi ,  Ichiro Akahori

IPC: B60W50/00

Abstract: An in-vehicle apparatus is provided which is installed in a vehicle including a power supply. The apparatus includes at least one drive circuit that is driven by DC voltage supplied from the power supply, and a positive electrode side line that electrically connects a positive electrode terminal of the power supply and a high-electric potential side electrical path of the drive circuit. A negative electrode terminal of the power supply and a low-electric potential side electrical path of the drive circuit are electrically connected to a body ground of the vehicle. The apparatus includes an auxiliary line that has a first end electrically connected to the positive electrode terminal or the negative electrode terminal and a second end connected to the high-electric potential side electrical path or the body ground, and that is arranged along the positive electrode side line or the body ground.

公开(公告)号：US09970376B2

公开(公告)日：2018-05-15

申请号：US15037447

申请日：2014-11-10

Applicant: DENSO CORPORATION

Inventor： Hiroaki Nagatomo ,  Makoto Tanaka

IPC: F02D41/24 ,  F02D41/20 ,  F02D41/40 ,  F02M51/06

CPC classification number: F02D41/2467 ,  F02D41/20 ,  F02D41/40 ,  F02D2041/2006 ,  F02D2041/2058 ,  F02D2041/2065 ,  F02M51/061 ,  F02M51/0671 ,  F02M51/0685 ,  Y02T10/44

Abstract: A fuel injection controller includes an energization time period calculation portion adapted to calculate an energization time period of a coil responsive to a target injection amount; and a rise control portion adapted to apply a boosted voltage to the coil, along with start of the energization time period, and to raise an current flowing through the coil to a predetermined threshold value. When a range where timing of the current raised to have a peak value at the threshold value appears in accordance with a range of an operating temperature of the coil is defined as a peak appearance range W1, the target injection amount is set such that timing of completion of the energization time period Ti is timing deviated from the peak appearance range W1.

公开(公告)号：US10197002B2

公开(公告)日：2019-02-05

申请号：US15501523

申请日：2015-07-14

Applicant: DENSO CORPORATION

Inventor： Makoto Tanaka

IPC: F02D41/00 ,  F02D41/24 ,  F02D41/20 ,  F02M51/06 ,  F02D41/40 ,  F02D41/14

Abstract: An engine includes a fuel injector. The fuel injector includes a valve body and an electromagnetic part that moves by energizing the valve body from a valve-closed position to a valve-open position. The fuel injector injects fuel when the valve body is moved to the valve-open position. In fuel injection, an ECU feeds a pre-charge current smaller than a current for operating the valve body, to the electromagnetic part in a pre-charge period at the beginning of a start of energization, and subsequently feeds a drive current for operating the valve body, to the electromagnetic part. Further, the ECU acquires a current change parameter as a parameter correlated with a speed of a rising change in drive current, and controls the feed of the pre-charge current to the electromagnetic part of the fuel injector, based on the acquired current change parameter.

公开(公告)号：US08745562B2

公开(公告)日：2014-06-03

申请号：US13705229

申请日：2012-12-05

Applicant: Denso Corporation

Inventor： Masashi Inagaki ,  Kouji Ichikawa ,  Makoto Tanaka ,  Hideki Kashiwagi

IPC: G06F17/50

CPC classification number: G06F17/5081 ,  G06F17/5077 ,  G06F2217/82

Abstract: A design method of on-board wiring for a designed circuit includes determining a severity as a crosstalk prevention index for a pair of wires based on a generated noise level of a damaging side wire and a permissible noise level of a damaged side wire. The pair of wires is then assigned a severity class (SC) based on the severity determined. The SC is a pre-defined value range(s) for severity classification. Based on a preset SC specific permissible value list, one or more by-design permissible values belonging to the SC is generated for a design element of the pair of wires. A layout of the pair of wires on a board is constructed based on the by-design permissible value.

Abstract translation: 基于设计电路的车载布线的设计方法，包括基于损坏的侧线的产生的噪声电平和损坏的侧线的容许噪声电平，确定作为一对导线的串扰防止指标的严重性。 然后根据确定的严重程度，分配一对电线的严重等级（SC）。 SC是严重性分类的预定义值范围。 基于预设的SC特定允许值列表，为一对导线的设计元件生成属于SC的一个或多个设计旁容许值。 电路板上的一对导线的布局是根据设计允许值构建的。

公开(公告)号：US10718290B2

公开(公告)日：2020-07-21

申请号：US15745465

申请日：2016-06-14

Applicant: DENSO CORPORATION

Inventor： Naoki Yoshiume ,  Makoto Tanaka ,  Keisuke Yanoto ,  Kosuke Nakano

IPC: F02D41/40 ,  F02D41/20 ,  F02M51/06 ,  F02D41/34 ,  F01N3/36 ,  F02M61/10 ,  F02D41/24 ,  F02D41/14 ,  F02D41/02 ,  F01N3/10

Abstract: A control device for controlling a fuel injection in an internal combustion engine provided with a fuel injection valve has a driving portion supplying an electric power to a terminal of the fuel injection valve so as to drive the fuel injection valve to be opened; a current detecting portion detecting a drive current flowing through the fuel injection valve when the fuel injection valve is driven to be opened; a voltage detecting portion detecting a terminal voltage of the terminal of the fuel injection valve; a correction portion correcting the electric power supplied by the driving portion so that an actual value of the drive current detected by the current detecting portion agrees with a target value; a valve close detecting portion detecting a valve closing timing of the fuel injection valve based on the terminal voltage detected by the voltage detecting portion in a condition where the electric power supplied by the driving portion is corrected by the correction portion.

公开(公告)号：US09890729B2

公开(公告)日：2018-02-13

申请号：US15030442

申请日：2015-02-03

Applicant: DENSO CORPORATION

Inventor： Makoto Tanaka ,  Hiroaki Nagatomo

IPC: F02D41/00 ,  F02D41/20 ,  F02D41/24 ,  F02M45/12 ,  F02D41/40

CPC classification number: F02D41/20 ,  F02D41/247 ,  F02D41/402 ,  F02D2041/2055 ,  F02D2200/0614 ,  F02M45/12

Abstract: A fuel injection control unit includes an injection amount detector and a correction unit. When implementing partial lift injection where a valve closing operation is started after the valve body starts a valve opening operation and before a valve body reaches a maximum valve open position, the injection amount detector detects a physical quantity (valve closing timing) having a correlation with an injection amount. When implementing the partial lift injection, the correction unit corrects an energization time of a fuel injection valve on the basis of a detection value (learning value) that was previously detected by the injection amount detector. An energization time in a small amount region longer than a predetermined time in the partial lift injection is allowed to be corrected on the basis of a value (small amount time detection value) detected in the small amount region by the injection amount detector. On the other hand, an energization time in an extremely small amount region shorter than the predetermined time is prohibited from being corrected on the basis of the above small amount time detection value. As a result, a precision in the injection amount in the partial lift injection is improved.