公开(公告)号：US20180128188A1

公开(公告)日：2018-05-10

申请号：US15571960

申请日：2016-05-07

Applicant: DENSO CORPORATION

Inventor： Yasuo HIRATA

IPC: F02D1/06 ,  F02M59/36 ,  F02M51/04

CPC classification number: F02D1/06 ,  F02D41/3845 ,  F02D41/3854 ,  F02D2001/009 ,  F02D2041/1412 ,  F02D2041/142 ,  F02D2200/0602 ,  F02D2250/31 ,  F02M51/04 ,  F02M59/36

Abstract: A high-pressure pump control device is applied to an internal combustion engine including a high-pressure pump supplied with fuel discharged from a low-pressure pump and an injector supplied with fuel discharged from the high-pressure pump. The high-pressure pump control device includes a prediction unit predicting whether a discharge quantity of the high-pressure pump exceeds a discharge quantity of the low-pressure pump and a restricting unit executing a discharge quantity restriction control to restrict a discharge quantity of the high-pressure pump not to exceed a predetermined value when the prediction unit predicts that a discharge quantity of the high-pressure pump exceeds a discharge quantity of the low-pressure pump.

公开(公告)号：US20140069362A1

公开(公告)日：2014-03-13

申请号：US14079905

申请日：2013-11-14

Applicant: DENSO CORPORATION

Inventor： Yasuo HIRATA

IPC: F01L1/344

CPC classification number: F01L1/344 ,  F01L1/022 ,  F01L1/024 ,  F01L1/352 ,  F01L2001/0537 ,  F01L2800/01 ,  F01L2800/03

Abstract: When a cam shaft phase is changed during engine operation is stopped, a power supply increase control to an electric motor is carried out, according to which a power-supply duty ratio to the electric motor is increased to a predetermined power increase value which is necessary for moving a VVT apparatus during the stop of the engine operation. Then, the power-supply duty ratio is feedback controlled so that an actual changing speed of the cam shaft phase becomes equal to a target changing speed. As a result, the cam shaft phase can be surely changed and operating sound can be reduced by preventing the changing speed of the cam shaft phase from becoming too fast.

Abstract translation: 当在发动机运转期间改变凸轮轴相位时，执行对电动机的电力增加控制，根据该控制，电动机的电力占空比增加到必要的预定功率增加值 用于在发动机操作停止期间移动VVT装置。 然后，反馈控制电源占空比，使得凸轮轴相位的实际变化速度等于目标变化速度。 结果，通过防止凸轮轴相位的变化速度变得太快，可以可靠地改变凸轮轴相位并且可以降低操作声音。

公开(公告)号：US20190195164A1

公开(公告)日：2019-06-27

申请号：US16086114

申请日：2017-03-22

Applicant: DENSO CORPORATION

Inventor： Yasuo HIRATA

IPC: F02D45/00 ,  F02M55/02

Abstract: A control device is applied for an internal combustion engine which is provided with a high-pressure fuel pump driven by a driving shaft of the internal combustion engine to discharge a fuel pressurized in a pressurizing chamber, an accumulator accumulating a high-pressure fuel discharged from the high-pressure fuel pump, and a relief valve which is opened when a fuel pressure in the accumulator is higher than a specified pressure in order to return the fuel in the accumulator to a specified chamber where a fuel has lower pressure than a fuel in the pressurizing chamber. An idle speed of the internal combustion engine is increased to a specified speed when the fuel pressure in the accumulator has been higher than a determination pressure, which is lower than the specified pressure, for a first period or longer.

公开(公告)号：US20180156152A1

公开(公告)日：2018-06-07

申请号：US15567367

申请日：2016-04-04

Applicant: DENSO CORPORATION

Inventor： Takahisa NATORI ,  Tomoyuki TAKAGAWA ,  Hiroshi YAMAGUCHI ,  Yasuo HIRATA

IPC: F02D41/24 ,  F02M65/00 ,  F02M59/36 ,  F02M59/02 ,  F02M51/04

CPC classification number: F02D41/2464 ,  F02D41/20 ,  F02D41/2422 ,  F02D41/3082 ,  F02D41/3845 ,  F02D2041/1409 ,  F02D2041/141 ,  F02D2041/2027 ,  F02D2200/021 ,  F02D2200/023 ,  F02D2200/0602 ,  F02D2200/0606 ,  F02D2200/503 ,  F02M51/04 ,  F02M59/025 ,  F02M59/36 ,  F02M65/005

Abstract: A control device for a high-pressure pump includes: a determination unit, an acquisition unit, and an electric power setting unit. The determination unit determines whether a movable portion of an electromagnetic valve has been moved to a closed position to close the electromagnetic valve when the electromagnetic valve is energized. The acquisition unit acquires, as an electromagnetic-valve response time, a period of time from a start of the energization of the electromagnetic valve until when it is determined that the electromagnetic valve has been closed. The electric power setting unit sets a supply power to the electromagnetic valve by repeating a process in which the supply power to the electromagnetic valve is reduced so as to be smaller than a previous value until the electromagnetic-valve response time reaches a predefined upper limit value.

公开(公告)号：US20130192549A1

公开(公告)日：2013-08-01

申请号：US13750023

申请日：2013-01-25

Applicant: DENSO CORPORATION

Inventor： Hitoshi KATOH ,  Yasuo HIRATA

IPC: F01L1/34

CPC classification number: F01L1/34 ,  F01L1/344 ,  F01L2800/05 ,  F01L2820/032 ,  F02D35/026 ,  F02D2041/001 ,  F02D2041/2086 ,  F02D2200/023 ,  H03K2017/0806

Abstract: A control system for a variable valve timing apparatus that changes a valve timing of an internal combustion engine using a motor which is controlled by operating a switching element includes: an oil temperature estimating portion; a substrate temperature estimating portion; and a current limit controller. The oil temperature estimating portion estimates a temperature of lubricating oil of the engine. The substrate temperature estimating portion estimates a temperature of a substrate to which the switching element is mounted based on the temperature of the lubricating oil. The current limit controller limits a current flowing through the switching element based on the temperature of the substrate in a manner that a temperature of the switching element is restricted from exceeding a predetermined upper limit value.

Abstract translation: 一种可变气门正时装置的控制系统，其使用通过操作开关元件控制的电动机来改变内燃机的气门正时，包括：油温推定部; 基板温度推定部; 和电流限制控制器。 油温推定部估计发动机的润滑油的温度。 基板温度推定部基于润滑油的温度来估计安装有开关元件的基板的温度。 电流限制控制器以限制开关元件的温度超过预定上限值的方式，限制基于基板的温度流过开关元件的电流。