CONTROL DEVICE FOR HIGH-PRESSURE PUMP

• US 20160186741A1
• Filed: 07/14/2014
• Published: 06/30/2016
• Est. Priority Date: 08/02/2013
• Status: Abandoned Application

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: TAKAGAWA, Tomoyuki, SAKAMOTO, Yuuki
• Application Number:
  US14/909,368
• Publication Number:
  US 20160186741A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F02D 2041/2055 with means for determining actual opening or closing time
• CPC Class Codes: F02D 2041/2058 using information of the actual current value
• CPC Class Codes: F02D 41/3845 by controlling the flow into the common rail, e.g. the amount of fuel pumped
• CPC Class Codes: F02M 59/025 characterised by a single piston
• CPC Class Codes: F02M 59/366 Valves being actuated electrically
• CPC Class Codes: F02M 59/368 Pump inlet valves being closed when actuated
• CPC Class Codes: F02M 59/464 Inlet valves of the check valve type
• CPC Class Codes: F02M 59/466 Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
• CPC Class Codes: F02M 63/0033 Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
• CPC Class Codes: F02M 63/0043 Two-way valves
• CPC Class Codes: F02M 63/0049 Combined valve units, e.g. for controlling pumping chamber and injection valve
• CPC Class Codes: F04B 19/22 of reciprocating-piston type
• CPC Class Codes: F04B 49/065 and making use of computers
• CPC Class Codes: F04B 49/22 by means of valves F04B49/03 takes precedence
• CPC Class Codes: F04B 53/001 Noise damping
• CPC Class Codes: F04B 53/14 Pistons, piston-rods or piston-rod connections
• CPC Class Codes: F04B 53/16 Casings; Cylinders; Cylinder liners or heads; Fluid connections

Abstract

A high-pressure pump includes a plunger and a control valve. 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 a 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. The ECU executes sound reduction control that reduces actuation sound of the high-pressure pump by controlling supply power supplied to the electromagnetic section on the basis of a determination result of the actuation determination in previous energization by the actuation determination section.

Claims

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 a high-pressure pump adjusting a fuel discharge amount of the high-pressure pump by switching between a valve opening and a valve closing of the control valve by the energization control, the control device for a high-pressure pump comprising;

a movement detection section detecting movement of the valve body with respect to a drive command of the control valve;

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; and

an energization control section executing sound reduction control that reduces actuation sound of the high-pressure pump by controlling supply power supplied to the electromagnetic section on the basis of a determination result of the actuation determination in previous energization by the actuation determination section.

2. The control device for a 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 a high-pressure pump according to claim 1, wherein the energization control section executes, as the sound reduction control, power reduction control controlling the supply power with power that is reduced by a predetermined amount from the supply power in the previous energization during later energization than the previous energization in the case where it is determined by the actuation determination section that the high-pressure pump is actuated in the previous energization.

4. The control device for a high-pressure pump according to claim 3, wherein the energization control section prohibits reduction in the supply power by the power reduction control in the case where the supply power is controlled at or near actuation limit power of the high-pressure pump.

5. The control device for a high-pressure pump according to claim 1, wherein the energization control section executes, as the sound reduction control, power increase control for controlling the supply power with power that is increased by a predetermined amount from the supply power in the previous energization during the later energization than the previous energization in the case where it is determined by the actuation determination section that the high-pressure pump is not actuated in the previous energization.

6. The control device for a high-pressure pump according to claim 1, wherein the energization control section executes, as the sound reduction control:

power reduction control for controlling the supply power with power that is reduced by a predetermined amount from the supply power in the previous energization during later energization than the previous energization in the case where it is determined by the actuation determination section that the high-pressure pump is actuated in the previous energization; and

power increase control for controlling the supply power with power that is increased by a predetermined amount from the supply power in the previous energization during the later energization than the previous energization in the case where it is determined by the actuation determination section that the high-pressure pump is not actuated in the previous energization due to execution of the power reduction control.

7. The control device for a high-pressure pump according to claim 1, further comprising

a learning section storing the supply power of time in which it is determined by the actuation determination section that the high-pressure pump is actuated as a learning value of the actuation limit power of the high-pressure pump in the case where a determination result by the actuation determination section differs between the previous energization and the later determination than the previous energization, wherein

the energization control section controls the supply power on the basis of the actuation limit power that is stored by the learning section.

8. The control device for a high-pressure pump according to claim 7, wherein the actuation determination of the high-pressure pump by the actuation determination section is continuously made in a period in which the supply power is controlled on the basis of the actuation limit power that is stored by the learning section.

9. The control device for a high-pressure pump according to claim 1, wherein

as the sound reduction control, the energization control section controls the supply power by setting power that is increased or reduced by a predetermined change amount from the supply power in the previous energization as the supply power in the later energization than the previous energization, and

executes variable control of the change amount in accordance with the supply power.

10. The control device for a high-pressure pump according to claim 9, wherein the change amount is reduced as the supply power becomes low.

11. The control device for a high-pressure pump according to claim 1, wherein

the energization control section controls the supply power in the sound reduction control by increasing or reducing the supply power in the later energization than the previous energization with respect to the supply power in the previous energization, and

the supply power is changed with a period after it is determined by the actuation determination section that the high-pressure pump is not actuated until actuation of the high-pressure pump is detected for multiple times by the actuation determination section as one interval.

12. The control device for a 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

the energization control section controls the supply power by controlling the voltage applied to the electromagnetic section in the sound reduction control.

13. The control device for a 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, 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 the drive command of the control valve on the basis of the supply power; 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.

14. The control device for a high-pressure pump according to claim 1, wherein

the energization control section changes the supply power to an increased side in the later energization than the previous energization in the case where it is determined by the actuation determination section that the high-pressure pump is not actuated in the previous energization, and includes an abnormality diagnosis section executing abnormality diagnosis of the high-pressure pump on the basis of the supply power is provided.