Control device for high-pressure pump

Patent metadata

Field	Value
Publication number	US-2016186707-A1
Application number	US-201414909343-A
Country	US
Kind code	A1
Filing date	Jul 14, 2014
Priority date	Aug 2, 2013
Publication date	Jun 30, 2016
Grant date	—

Abstract

A high-pressure pump includes a plunger reciprocating in conjunction with rotation of a rotational shaft to be able to change a volume of a pressurizing chamber and a control valve having a first valve body and a second valve body disposed in a fuel suction passage that communicates with the pressurizing chamber and supplies/blocks fuel to/from the pressurizing chamber by displacing the valve body in an axial direction by switching between energization and non-energization of a coil. An ECU adjusts a fuel discharge amount of the high-pressure pump by switching a valve opening and a valve closing of the control valve by the energization control of the coil. The ECU detects movement of the valve body with respect to a drive command of the valve opening or the valve closing of the control valve and executes an actuation determination of the high-pressure pump on the basis of a detection result.

First claim

1 . A control device for a high-pressure pump that is applied to a high-pressure pump including: a plunger that reciprocates in conjunction with rotation of a rotational shaft so as to be able to change a volume of a pressurizing chamber; and a control valve that has a valve body disposed in a fuel suction passage that communicates with the pressurizing chamber and supplies/blocks fuel to/from the pressurizing chamber by displacing the valve body in an axial direction by energization control with respect to an electromagnetic section, and the control device for the high-pressure pump adjusting a fuel discharge amount of the high-pressure pump by switching a valve opening and a valve closing of the control valve by the energization control, the control device for the high-pressure pump comprising:
a movement detection section detecting movement of the valve body with respect to a drive command of the valve opening or the valve closing of the control valve; and an actuation determination section making an actuation determination of the high-pressure pump on the basis of a detection result of the movement detection section.

2 . The control device for the high-pressure pump according to claim 1 , wherein
the movement detection section detects the movement of the valve body with respect to the drive command by detecting at least one of a change in a current flowing through the electromagnetic section, a change in a voltage applied to the electromagnetic section, a displacement amount of the valve body, and a vibration of the control valve.

3 . The control device for the high-pressure pump according to claim 1 , wherein
the movement detection section detects the movement of the valve body with respect to the drive command by detecting the change in the current flowing through the electromagnetic section and, at the time, detects that a switching between an increased tendency and a reduced tendency of the current occurs as the change in the current.

4 . The control device for the high-pressure pump according to claim 3 , wherein
the control valve is closed when the valve body is attracted toward the electromagnetic section during energization of the electromagnetic section, and the movement detection section detects, as the change in the current, that the reduced tendency of the current occurs in a period in which the drive command of the valve closing of the control valve is outputted.

5 . The control device for the high-pressure pump according to claim 3 , wherein
the control valve is closed when the valve body is attracted toward the electromagnetic section during energization of the electromagnetic section, and the movement detection section detects, as the change in the current, that the current is shifted from the reduced tendency to an increase in a period in which the drive command of the valve closing of the control valve is outputted.

6 . The control device for the high-pressure pump according to claim 1 , wherein
an energization operation for the electromagnetic section is performed in duty control, and the movement detection section detects the movement of the valve body with respect to the drive command by detecting the change in the voltage applied to the electromagnetic section, and, at the time, as the change in the voltage, detects that the change in the voltage that is at least equal to a predetermined value occurs separately from a voltage change by the duty control in a period in which the electromagnetic section is energized.

7 . The control device for the high-pressure pump according to claim 1 , wherein
the movement detection section detects the movement of the valve body with respect to the drive command by detecting the change in the voltage applied to the electromagnetic section, and, at the time, detects a change in the voltage in a period from time at which the energization of the electromagnetic section is stopped until a predetermined time elapses.

8 . The control device for the high-pressure pump according to claim 1 , further comprising
a displacement sensor detecting displacement of the valve body, wherein the movement detection section detects the movement of the valve body with respect to the drive command by detecting the displacement of the valve body by the displacement sensor.

9 . The control device for the high-pressure pump according to claim 1 , wherein
the control valve is provided with a movement limiting member limiting the movement of the valve body in the axial direction and a vibration sensor detecting a vibration that is generated when the valve body collides with the movement limiting member is provided, and the movement detection section detects the movement of the valve body with respect to the drive command by detecting the vibration of the control valve by the vibration sensor.

10 . The control device for the high-pressure pump according to claim 1 , the control device for a high-pressure pump energizing the electromagnetic section in a volume reduction stroke for reducing the volume of the pressurizing chamber, and adjusting the fuel discharge amount of the high-pressure pump on the basis of start timing of the energization, the control device for a high-pressure pump further comprising:
a time computation section computing a valve closing required time that is required for the valve body to be displaced to a position at which a supply of the fuel to the pressurizing chamber is blocked from time at which the valve closing of the control valve is commanded on the basis of a detection result of the movement detection section; and a timing computation section computing energization start timing for energizing the electromagnetic section in the volume reduction stroke on the basis of the valve closing required time that is computed by the time computation section.

11 . The control device for the high-pressure pump according to claim 1 , further comprising
an abnormality diagnosis section diagnosing abnormality of the high-pressure pump on the basis of the detection result of the movement detection section.

Assignees

• Denso Corp

Inventors

• Sakamoto Yuuki

Classifications

• F02M59/02 Primary

  of reciprocating-piston {or reciprocating-cylinder} type · CPC title

• F02M59/466

  Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means · CPC title

• F02D2041/2051

  using voltage control · CPC title

• F02D41/3845

  by controlling the flow into the common rail, e.g. the amount of fuel pumped · CPC title

• F02M59/368

  Pump inlet valves being closed when actuated · CPC title