Control device for high pressure pump

Patent metadata

Field	Value
Publication number	US-10890176-B2
Application number	US-201515510387-A
Country	US
Kind code	B2
Filing date	Sep 1, 2015
Priority date	Sep 19, 2014
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

A control device includes a plurality of sound reducing parts that is operated individually, when a predetermined condition for operation is met, at each of a plurality of timings when an operating sound is generated as a result of a movement of a valve body, in one open-and-close period, and that reduces the operating sound, at each of the plurality of the timings, by changing a period of energizing an electromagnetic part to an increase side relative to a normal time, an upper limit determination part that determines whether a required period of energizing the electromagnetic part in the one open-and-close period exceeds a predetermined upper limit value, when all the plurality of the sound reducing parts are operated, and a selectively operating part that selects and operates one or more of the plurality of the sound reducing parts to an extent that the required period of energizing does not exceed the upper limit value, when the upper limit determination part has determined that the required period of energizing exceeds the upper limit value.

First claim

The invention claimed is:

1. A control device for a high pressure pump the high pressure pump including a plunger that reciprocates with rotation of a rotating shaft so that a capacity of a pressurization chamber is variable, and a regulating valve having a valve body placed in a fuel suction passage communicating with the pressurization chamber, the regulating valve configured to close the fuel suction passage supplying fuel to the pressurization chamber when an electromagnetic part is in an energized state and configured to open the fuel suction passage shutting off fuel supply to the pressurization chamber when the electromagnetic part is in a non-energized state, as a result of moving the valve body by switching the electromagnetic part between the energized state and the non-energized state, and the regulating valve is further configured to adjust a fuel discharge amount of the high pressure pump by switching the regulating valve between an open state and a closed state, the control device comprising:
a plurality of sound reducing parts that are operated individually, when a predetermined condition for operation of the control device in a sound reducing control mode is met, at each of a plurality of timings when an operating sound is generated as a result of a movement of the valve body, in one open-and-close period in which the valve body makes an opening movement and a closing movement, and that are each configured to reduce an operating sound that is generated as a result of a movement of the valve body, at each of the plurality of the timings, by increasing a required period of energizing the electromagnetic part relative to that in a normal control time;
an upper limit determination part that determines whether the increased required period of energizing the electromagnetic part in the one open-and-close period exceeds a predetermined upper limit value, when all the plurality of the sound reducing parts are operated; and
a selectively operating part configured to operate the plurality of the sound reducing parts in the one open-and-close period, wherein
the selectively operating part:
selects at least one of the plurality of the sound reducing parts according to an order of priority determined in advance on the basis of at least one of an effect of reducing the operating sound or an effect of reducing an energizing period of the electromagnetic part and operates the at least one of the plurality of the sound reducing parts, and
prohibits the remaining one or more of the plurality of the sound reducing parts to an extent that the required period of energizing does not exceed the upper limit value, when the upper limit determination part has determined that the required period of energizing exceeds the upper limit value.

2. The control device for a high pressure pump according to claim 1 , wherein
the selectively operating part selects and operates one or more of the plurality of the sound reducing parts and prohibits the remaining one or more of the plurality of the sound reducing parts, based on efficiency in sound reducing effect in respect to each of the plurality of the sound reducing parts.

3. The control device for a high pressure pump according to claim 1 , wherein
the selectively operating part selects and operates one or more of the plurality of the sound reducing parts and prohibits the remaining one or more of the plurality of the sound reducing parts, based on efficiency in effect of reducing an energizing period in respect to each of the plurality of the sound reducing parts.

4. The control device for a high pressure pump according to claim 1 , further comprising:
an allowance determining part that determines whether the required period of energizing the electromagnetic part in the one open-and-close period exceeds a predetermined upper limit value, when one or more of the plurality of the sound reducing parts is/are operated, wherein
the selectively operating part operates the selected sound reducing part or parts, provided that the allowance determining part has determined that the required period of energizing does not exceed the upper limit value.

5. The control device for a high pressure pump according to claim 1 , wherein
the plurality of the sound reducing parts include a valve-closing-time sound reducing part that reduces the operating sound produced when the regulating valve closes, and a valve-opening-time sound reducing part that reduces the operating sound produced when the regulating valve opens.

6. The control device for a high pressure pump according to claim 1 , wherein
the regulating valve includes a first valve body that allows or shuts off, as the valve body, a flow of fuel in the fuel suction passage, and a second valve body that is placed in such a manner as to be movable in a same direction as a direction of the opening and closing movements of the first valve body, the second valve body causing the first valve body to make the opening and closing movements by abutting and separating from the first valve body due to switching the electromagnetic part between the energized state and the non-energized state, and
the plurality of the sound reducing parts includes
a first sound reducing part that reduces the operating sound at the time of closing the regulating valve, by causing the valve body to move at a slower speed than that in the normal control time,
a second sound reducing part that reduces the operating sound produced when the first and second valve bodies come in contact with each other, and
a third sound reducing part that reduces the operating sound at the time of opening the regulating valve, by causing the valve body to move at a slower speed than that in the normal control time.

7. The control device for a high pressure pump according to claim 1 , wherein
the selectively operating part operates all of the plurality of the sound reducing parts on determination of that upper limit determination part that the required period of energizing is equal to or less than the upper limit value.

8. The control device for a high pressure pump according to claim 7 , wherein
the regulating valve further includes a movable part movable to abut onto and to separate from the valve body to cause the valve body to open and close the fuel suction passage on de-energization and energization of the electromagnetic part.

9. The control device for a high pressure pump according to claim 8 , wherein
the plurality of the sound reducing parts includes a first sound reducing part that sets a voltage duty cycle of the electromagnetic part lower than that of the normal control time in a period after a bottom dead center of the plunger and before a top dead center of the plunger.

10. The control device for a high pressure pump according to claim 9 , wherein
the selectively operating part selects and operates the first sound reducing part and prohibits the remaining one or more of the plurality of the sound reducing parts, based on the order of priority determined on the basis of efficiencies in reducing an energizing period.

11. The control device for a high pressure pump according to claim 8 , wherein
the plurality of the sound reducing parts includes a second sound reducing part that stops energization of the electromagnetic part at a timing which is after a top dead center of the plunger and is later than that in the normal control time.

12. The control device for a high pressure pump according to claim 11 , wherein
the selectively operating part prohibits the second sound reducing part based on efficiency in sound reducing effect.

13. The control device for a high pressure pump according to claim 8 , where

Assignees

• Denso Corp

Inventors

• Fukuda Hiroyuki

Classifications

• F02D41/3845 Primary

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

• F02D2041/2037

  for preventing bouncing of the valve needle · CPC title

• F02M59/368

  Pump inlet valves being closed when actuated · CPC title

• F02D2041/2048

  said control involving a limitation, e.g. applying current or voltage limits · CPC title

• F02D2041/2058

  using information of the actual current value · CPC title