Fuel injection device
AssigneeHitachi Automotive Systems, Ltd.
InventorsRyo Kusakabe, Motoyuki Abe, Yoshihito Yasukawa, Noriyuki Maekawa, Takuya Mayuzumi, Tohru Ishikawa
Life of this patent
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Abstract
A drive unit of a fuel injection device includes a driver circuit. The driver circuit opens and closes a valve element of the fuel injection device by supplying a drive current to the fuel injection device. The driver circuit supplies the drive current to open the valve element and sets the drive current to zero in an intermediate lift area. The intermediate lift area is an area is which a lift amount of the valve element is smaller than a maximum target lift amount.
Claims11
A drive unit of a fuel injection device, comprising:
- a driver circuit which opens and closes a valve element of the fuel injection device by supplying a drive current to the fuel injection device, wherein
- the driver circuit supplies the drive current to open the valve element and sets the drive current to zero in an intermediate lift area in which a lift amount of the valve element is smaller than a maximum target lift amount, and
- wherein the driver circuit supplies a first drive current before detecting a valve opening of the valve element and a second drive current after detecting the valve opening, and an increase rate of the second drive current is smaller than the increase rate of the first drive current.
A drive unit of a fuel injection device, comprising:
- a driver circuit which opens and closes a valve element of the fuel injection device by supplying a drive current to the fuel injection device, wherein
- the driver circuit supplies the drive current to open the valve element and sets the drive current to zero in an intermediate lift area in which a lift amount of the valve element is smaller than a maximum target lift amount,
- the driver circuit executes a full lift control that the lift amount of the valve element reaches the maximum target lift amount and a intermediate lift control that the lift amount of the valve element does not reach the maximum target lift amount by setting the drive current to zero in the intermediate lift area, and
- a close delay time is a time from a closing start point at which the valve element starts to be closed until the valve element closes, Td1 is defined as the close delay time in the intermediate lift control, Td2 is defined as the close delay time in the full lift control, and Td1 is shorter than Td2.
Dependencies are inferred from the claim text.