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公开(公告)号：US20210396198A1
公开(公告)日：2021-12-23
申请号：US17466991
申请日：2021-09-03
Applicant: DENSO CORPORATION
Inventor： Hisatoshi SHIBUYA
Abstract: A metering valve supplies fuel to and block fuel from a pressurizing chamber by moving a valve body by switching between energization and de-energization of an electromagnetic unit. An energization control unit performs a valve closing control and a valve opening control to reduce operating sound in one opening and closing period in which the valve body opens and closes. A time control unit controls, on determination that the energizing period of the electromagnetic unit exceeds the upper limit value, a moving speed of the valve body when the valve body moves to a valve closing side, such that the energization period of the electromagnetic unit in the one opening and closing period does not exceed the upper limit value, thereby to cause the energization control unit to perform both the valve closing control and the valve opening control in the one opening and closing period.
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公开(公告)号：US20210348577A1
公开(公告)日：2021-11-11
申请号：US17382655
申请日：2021-07-22
Applicant: DENSO CORPORATION
Inventor： Yuusuke ANDOU , Hisatoshi SHIBUYA , Satoshi MASUDA
Abstract: A control device is included in a fuel injection system. The fuel injection system includes a low pressure pump, a high pressure pump, an accumulator, a fuel injection valve, a relief valve, and a return pipe. The high pressure pump increases a pressure of a fuel discharged from the low pressure pump and discharges high pressure fuel. The accumulator stores the high pressure fuel discharged from the high pressure pump. The relief valve is provided in a high pressure portion provided downstream from the high pressure pump and opens when a high pressure abnormality occurs in the high pressure portion. The return pipe returns the high pressure fuel in the high pressure portion to a low pressure portion provided downstream from the low pressure pump by the relief valve opening.
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