JP2020190209A - Metering device - Google Patents

Abstract

To provide a technology which can easily discharge foreign matters in a metering device together with surplus fuel.SOLUTION: A metering device 40 for metering a fuel flow rate which is pressure-sent from a fuel injection pump comprises a valve seat 42a, a valve member 44, a drive part 68, a movable part 50, and fuel flow passages 214 to 218. Fuel is sucked into a pressurization chamber in a suction stroke in which a plunger is moved in a direction opposite to a pressurization direction in which the fuel in the pressurization chamber is pressurized due to the seat-leaving of the valve member from the valve seat, and the fuel in the pressurization chamber is pressurized by the plunger, and pressure-sent due to the seating of the valve member on the valve seat in a pressure-sending stroke in which the plunger is moved in the pressurization direction. The movable part is changed in a position by being controlled in electricity-carrying to the drive part, and switches the seating of the valve member on the valve seat, and the seat-leaving of the valve member from the valve seat by the change of the position. The fuel flow passages pass at least either of the inside and the outside of the movable part, and are different from one another in inlets and outlets from which surplus fuel is discharged.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a technique for adjusting the pumping amount of a fuel injection pump.

In a fuel injection pump that pressurizes and pumps fuel, a technique for adjusting the pumping amount of the fuel injection pump with a metering device is known.
For example, in Patent Document 1 below, in a solenoid valve used in a metering device, a movable portion that reciprocates by being controlled to energize a coil that is a drive portion, and both sides of the movable portion in the reciprocating movement direction. It is described that a communication passage is provided to communicate with the space of. In the technique described in Patent Document 1, by providing a continuous passage in the movable part, the pressure difference between the spaces on both sides in the reciprocating movement direction of the movable part is reduced, and the responsiveness of the reciprocating movement of the movable part is improved. It is said.

Japanese Patent No. 5857878

However, in the technique described in Patent Document 1, a passage through which excess fuel flows is not formed in one of the spaces on both sides of the movable portion in the reciprocating movement direction other than the continuous passage of the movable portion. Therefore, the surplus fuel flowing into one space from the entrance of the communication passage returns to the other space with the entrance of the communication passage as the exit.

As a result of detailed examination by the inventor, in the configuration of the metering device described in Patent Document 1, excess fuel of the metering device is difficult to be discharged through the moving portion, so that foreign matter inside the metering device is surplus. The problem was found that it is difficult to be discharged together with fuel.

One aspect of the present disclosure is to provide a technique for easily discharging foreign matter inside the metering device together with excess fuel.

The metering device (40, 80, 110) according to one aspect of the present disclosure is a metering device that regulates the flow rate of fuel pumped from the fuel injection pump (20), and includes a valve seat (42a) and a valve. Member (44), drive unit (68), movable unit (50, 90, 120, 130, 140), fuel flow path (214 to 218, 222, 230, 232, 240, 250 to 254, 260, 270, 280) and.

When the valve member is separated from the valve seat, the fuel is sucked into the pressurizing chamber in the suction stroke in which the plunger moves in the direction opposite to the pressurizing direction in which the fuel in the pressurizing chamber is pressurized, and the plunger moves in the pressurizing direction. By sitting on the valve seat in the moving pumping stroke, the fuel in the pressurizing chamber is pressurized by the plunger and pumped.

The position of the movable portion changes by controlling the energization of the drive portion, and the position changes to switch whether the valve member sits on the valve seat or leaves the valve seat.
The fuel flow path passes through at least one of the inside and the outside of the movable part, and the inlet and the outlet from which the surplus fuel is discharged are different.

According to such a configuration, the foreign matter inside the metering device is discharged together with the surplus fuel from the fuel flow path passing through at least one of the inside and the outside of the movable portion. Furthermore, since the inlet and outlet of the fuel flow path from which the surplus fuel is discharged are not the same but different, foreign matter inside the metering device is not returned to the inlet side of the fuel flow path and is combined with the surplus fuel. It is discharged from the outlet of the fuel flow path.

The schematic diagram which shows the structure of the fuel injection pump of 1st Embodiment. The cross-sectional view which shows the metering valve at the time of opening a valve. Sectional drawing which shows the metering valve at the time of valve closing. The cross-sectional view which shows the structure of the movable part. FIG. 4 is a sectional view taken along line VV of FIG. FIG. 4 is a sectional view taken along line VI-VI of FIG. A time chart showing the operation of the metering valve. The schematic diagram which shows the fuel discharge flow path and a rod of 1st Embodiment. IX direction arrow view of FIG. A characteristic diagram showing a change in the flow path area of the fuel discharge flow path when the energization of the metering valve is turned on and off. A characteristic diagram showing a change in the flow path area of the fuel discharge flow path when the duty of energization to the metering valve is controlled. Sectional drawing which shows the desirable structure of a movable core. Sectional drawing which shows desirable structure of a rod. The cross-sectional view which shows the metering valve at the time of opening a valve of 2nd Embodiment. Sectional drawing which shows the metering valve at the time of valve closing. The cross-sectional view which shows the metering valve at the time of opening a valve of 3rd Embodiment. Sectional drawing which shows the metering valve at the time of valve closing. FIG. 3 is a partial cross-sectional view showing the rod of the fourth embodiment. The schematic diagram which shows the fuel discharge flow path and a rod of 5th Embodiment. XX direction arrow view of FIG. A characteristic diagram showing a change in the flow path area of the fuel discharge flow path when the energization of the metering valve is turned on and off. A characteristic diagram showing a change in the flow path area of the fuel discharge flow path when the duty of energization to the metering valve is controlled. The schematic diagram which shows the fuel discharge flow path and a rod of 6th Embodiment. A characteristic diagram showing a change in the flow path area of the fuel discharge flow path when the energization of the metering valve is turned on and off. A characteristic diagram showing a change in the flow path area of the fuel discharge flow path when the duty of energization to the metering valve is controlled. The schematic diagram which shows the fuel discharge flow path and a rod of 7th Embodiment. FIG. 5 is a characteristic diagram showing a relationship between energization of the metering valve of the seventh embodiment and the flow path area of the fuel discharge flow path. The schematic diagram which shows the fuel discharge flow path and a rod of 8th Embodiment. FIG. 5 is a characteristic diagram showing a relationship between energization of the metering valve of the eighth embodiment and the flow path area of the fuel discharge flow path.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
[1. First Embodiment]
[1-1. Constitution]
The fuel supply system 2 of the present embodiment shown in FIG. 1 supplies fuel to, for example, a common rail (not shown) that accumulates fuel to be supplied to a fuel injection valve (not shown). The fuel supply system 2 includes a fuel filter 10, a main tank 12, a sub tank 14, a feed pump 16, a jet pump 18, a fuel injection pump 20, and an ECU 100. ECU is an abbreviation for Electronic Control Unit.

The fuel filter 10 removes foreign matter in the fuel supplied by taking the fuel flow path 200 from the main tank 12 by the electric feed pump 16. The fuel from which foreign matter has been removed by the fuel filter 10 is supplied to the fuel injection pump 20.

The main tank 12 and the sub tank 14 may be so-called saddle-shaped fuel tanks in which the fuel chambers are independent but the tank cases are combined, or the tank cases are installed independently and separately from each other. It may be configured.

The jet pump 18 ejects excess fuel discharged from the fuel supply flow path from the main tank 12 to the fuel injection valve to the main tank 12 via the fuel discharge flow path 202 from a nozzle to generate a negative pressure. The jet pump 18 sucks up the fuel in the sub tank 14 by the generated negative pressure and transfers it to the main tank 12. Excess fuel is discharged from the fuel injection pump 20, the common rail, and the fuel injection valve into the fuel discharge flow path 202.

The fuel injection pump 20 includes an orifice 22, a roller 30, a tappet 32, a plunger 34, a spring 36, a check valve 38, and a metering valve 40.
The orifice 22 determines the maximum flow rate of the surplus fuel discharged from the fuel supplied to the fuel injection pump 20 through the fuel filter 10 by the orifice diameter.

The roller 30, the tappet 32, and the plunger 34 are loaded from the spring 36 toward the cam. The tappet 32 and the plunger 34 reciprocate together with the roller 30 as the roller 30 rotates along the cam profile due to the rotation of the cam (not shown).

When the plunger 34 reciprocates, the fuel sucked into the pressurizing chamber 206 from the fuel flow path 204 passes through the fuel filter 10 is pressurized, and the pressurized fuel is pumped from the check valve 38. The fuel pumped from the check valve 38 is supplied to the common rail through the fuel flow path 208.

The metering valve 40 allows fuel to be sucked from the fuel flow path 204 into the pressurizing chamber 206 by opening the valve, and fuel is sucked from the fuel flow path 204 into the pressurizing chamber 206 by closing the valve. Prohibit that. When the metering valve 40 closes in the pressure feeding stroke in which the plunger 34 moves in the pressurizing direction to pressurize the fuel in the pressurizing chamber 206, the pressurization of the fuel in the pressurizing chamber 206 is started.

The ECU 100 includes a microcomputer having a CPU and a semiconductor memory such as RAM or ROM. The ECU 100 may include one microcomputer or a plurality of microcomputers.

The ECU 100 controls the valve closing timing of the metering valve 40 by controlling the energization of the metering valve 40 to the coil 68 described later. In the pumping stroke, the ECU 100 controls the valve closing timing of the metering valve 40 to regulate the pumping amount of the fuel pumped from the fuel injection pump 20.

Next, the configuration of the metering valve 40 will be described with reference to FIG.
The metering valve 40 includes a valve body 42, a valve member 44, a spring seat 46, a spring 48, a movable portion 50, a valve body 56, a stopper 58, a spring 60, a magnetic member 62, and non-magnetic. It includes a member 64, a fixed core 66, a coil 68, and a yoke 70.

The valve body 42 is formed with a fuel flow path 204 that guides the fuel supplied from the fuel filter 10 to the fuel injection pump 20 to the pressurizing chamber 206. The valve body 42 supports the valve member 44 so as to be reciprocating. Further, the valve body 42 is formed with a valve seat 42a on which the valve member 44 is seated.

When the valve member 44 is seated on the valve seat 42a, the metering valve 40 is closed and the inhalation of fuel from the fuel flow path 204 into the pressurizing chamber 206 is cut off. When the valve member 44 is released from the valve seat 42a, the metering valve 40 is opened and fuel is allowed to be sucked from the fuel flow path 204 into the pressurizing chamber 206.

A plurality of flat surfaces are formed on the outer peripheral surface of the valve member 44 in the circumferential direction along the reciprocating movement direction of the valve member 44. The flat surface portion of the valve member 44 and the inner peripheral surface of the cylindrical valve body 42 provide a plurality of fuel flow paths 210 communicating with the fuel flow path 204 and the fuel space 212 described later in the circumferential direction of the valve member 44. It is formed.

The spring seat 46 is fixed to the valve member 44 by, for example, welding. The spring 48 applies a load to the spring seat 46 in the direction in which the valve member 44 is pressed against the rod 52 of the movable portion 50, which will be described later, that is, in the direction in which the valve member 44 is seated on the valve seat 42a. The spring seat 46 and the spring 48 are housed in the fuel space 212 formed by the valve body 42 and the valve body 56.

The movable portion 50 includes a rod 52 and a movable core 54. The rod 52 is fixed to the movable core 54 by, for example, welding. The movable core 54 is housed in the fuel space 220.

As shown in FIGS. 2 to 6, a plurality of flat surfaces are formed on the outer peripheral surface of the rod 52 in the circumferential direction along the reciprocating movement direction of the rod 52. A plurality of fuel flow paths 214 communicating with the fuel space 212 and the fuel space 220 are formed in the circumferential direction of the rod 52 by the flat surface portion of the rod 52 and the inner peripheral surface of the cylindrical valve body 56.

Further, as shown in FIGS. 2 to 4 and 6, a groove is formed on the outer peripheral surface of the rod 52 to connect the flat surface portions adjacent to each other in the circumferential direction of the rod 52 and the flat surface portions. The groove of the rod 52 and the inner peripheral surface of the valve body 56 form a communication passage 216 that communicates the fuel flow paths 214 and the fuel flow paths 214 that are adjacent to each other in the circumferential direction. The movable core 54 is formed with a plurality of communication passages 222 in the circumferential direction so as to penetrate the movable core 54 in the axial direction.

The valve body 56 supports the rod 52 so as to be reciprocally movable. The valve body 56 is formed with a fuel discharge passage 218 that communicates with the communication passage 216 formed on the rod 52 side in the state shown in FIG. 2 in which the energization of the coil 68 is turned off. The fuel discharge flow path 218 discharges surplus fuel into the fuel discharge flow path 202.

Therefore, in the state shown in FIG. 2 in which the energization of the coil 68 is turned off, the surplus fuel in the metering valve 40 has the fuel flow path 214 as an inlet, the fuel flow path 214, the communication passage 216, and the fuel discharge flow path. It flows in the order of 218, and is discharged with the fuel discharge flow path 218 different from the fuel flow path 214 as an outlet. Therefore, the surplus fuel of the metering valve 40 is discharged to the fuel discharge flow path 202 without the fuel flow returning from the inlet to the outlet or flowing back.

The stopper 58 is a position shown in FIG. 3 for a rod 52 that moves to the fixed core 66 side together with the movable core 54 by a magnetic attraction force acting between the movable core 54 and the fixed core 66 when the coil 68 is turned on. Stop at. When the rod 52 moves to the fixed core 66 side, the valve member 44 is seated on the valve seat 42a by the load received from the spring 48. When the valve member 44 is seated on the valve seat 42a, the metering valve 40 opens.

When the coil 68 is energized, the moving distance from the state shown in FIG. 2 until the rod 52 comes into contact with the stopper 58 and stops is such that the valve member 44 moves to the valve seat 42a from the state shown in FIG. It is longer than the distance traveled to sit down. Since the valve member 44 and the rod 52 are separate members, the rod 52 reciprocates between the valve member 44 and the rod 52 in the state shown in FIG. 3 in which the energization of the coil 68 is turned on. Possible intervals are formed.

The spring 60 is mounted around the stopper 58, and applies a load to the rod 52 in the direction in which the rod 52 is pressed against the valve member 44, that is, in the direction in which the valve member 44 separates from the valve seat 42a. The load applied by the spring 60 to the rod 52 in the direction in which the valve member 44 is separated from the valve seat 42a is larger than the load applied to the spring seat 46 in the direction in which the valve member 44 is seated on the valve seat 42a.

Therefore, in the state shown in FIG. 2 in which the energization of the coil 68 is turned off and no magnetic attraction force is applied between the movable core 54 and the fixed core 66, the rod is caused by the difference in load between the spring 48 and the spring 60. 52 pushes the valve member 44 in the direction away from the valve seat 42a. As a result, when the valve member 44 leaves the valve seat 42a, the metering valve 40 opens.

The magnetic member 62 and the non-magnetic member 64 cover the outer periphery of the movable core 54. The magnetic member 62 supports the movable core 54 so as to be reciprocally movable. The non-magnetic member 64 is installed between the magnetic member 62 and the fixed core 66 to prevent the magnetic member 62 and the fixed core 66 from being magnetically short-circuited.

The coil 68 covers the outer periphery of the magnetic member 62, the non-magnetic member 64, and the fixed core 66. The yoke 70 covers the outer circumference of the coil 68, and magnetically connects the magnetic member 62 and the fixed core 66.

The magnetic flux generated by the coil 68 when the energization is turned on flows through a magnetic circuit formed by the movable core 54, the magnetic member 62, the fixed core 66, and the yoke 70. Then, as shown in FIG. 3, the load of the spring 60 is caused by the magnetic flux flowing through the magnetic gap between the movable core 54 and the fixed core 66 and the magnetic attraction acting between the movable core 54 and the fixed core 66. The movable core 54 is attracted to the fixed core 66 side against the above.

Further, as shown in FIG. 3, when the energization of the coil 68 is turned on and the movable core 54 is attracted to the fixed core 66 side against the load of the spring 60, the rod 52 moves, and the continuous passage 216 And the fuel discharge flow path 218 are displaced in the axial direction. As a result, the communication between the communication passage 216 and the fuel discharge flow path 218 is cut off, so that the amount of excess fuel discharged from the metering valve 40 through the fuel discharge flow path 218 becomes zero.

[1-2. processing]
Next, the flow rate control process of the surplus fuel discharged from the metering valve 40 by controlling the energization of the metering valve 40 by the ECU 100 will be described.

(1) During normal control As shown in FIG. 7, in the normal energization control, in the normal energization control, the ECU 100 moves the coil 68 in the suction stroke in the direction opposite to the pressurizing direction in which the plunger 34 pressurizes the fuel in the pressurizing chamber 206. The power to the power is turned off. As a result, as shown in FIG. 2, since the valve member 44 is separated from the valve seat 42a, the metering valve 40 is opened.

In this case, even if the movable core 54 is sucked to the fixed core 66 side by turning on the energization of the coil 68 and the rod 52 moves together with the movable core 54, the fuel flow flowing into the pressurizing chamber 206 from the fuel flow path 204 As a result, the valve member 44 is kept in a state of being separated from the valve seat 42a. Therefore, in the suction stroke, the metering valve 40 is opened regardless of whether the energization of the coil 68 is on or off, that is, regardless of the position of the movable portion 50, and the fuel is supplied to the pressurizing chamber 206. Inflows.

That is, in the suction stroke, the ECU 100 controls the length of time for turning on the energization of the coil 68 to change the position of the movable portion 50 without changing the position of the valve member 44, thereby adjusting the metering. The amount of excess fuel discharged from the valve 40 can be controlled.

Further, in the pumping stroke in which the plunger 34 moves in the pressurizing direction to pressurize the fuel in the pressurizing chamber 206, the ECU 100 is coiled at a predetermined timing of the pumping stroke so that the pumping amount required in the current pumping stroke is obtained. Turn on the power to 68.

When the energization of the coil 68 is turned on, the rod 52 moves to the fixed core 66 side together with the movable core 54 and reaches the upper end in contact with the stopper 58, so that the valve member 44 becomes the valve seat 42a due to the load received from the spring 48. Sit down. As a result, the metering valve 40 is closed and the plunger 34 moves in the pressurizing direction, so that the fuel in the pressurizing chamber 206 is pressurized and the pressurized fuel is pumped from the check valve 38.

As shown in FIG. 7, there is a time delay from when the energization of the coil 68 is turned on until the valve member 44 is seated on the valve seat 42a and the metering valve 40 is closed.
When the valve member 44 is seated on the valve seat 42a in the pressure feeding stroke, the force received from the fuel pressure in the pressurizing chamber 206 rather than the load received by the rod 52 from the spring 60 in the valve opening direction even when the energization of the coil 68 is turned off. The force received by the valve member 44 in the valve closing direction is larger than the sum of the load received from the spring 48 and the load received from the spring 48.

Therefore, in the pressure feeding stroke, when the valve member 44 is seated on the valve seat 42a and the metering valve 40 is closed, the energization of the coil 68 may be controlled to be on or off.
That is, when the valve member 44 is seated on the valve seat 42a and the metering valve 40 is closed in the pressure feeding stroke, the ECU 100 controls the length of time for turning on the energization of the coil 68 to control the valve member 44. By changing the position of the movable portion 50 without changing the position, it is possible to control the amount of excess fuel discharged from the metering valve 40.

In this way, in both the suction stroke and the pumping stroke, when the energization to the coil 68 is turned on, the movable portion 50 moves in the direction in which the valve member 44 is seated on the valve seat 42a, and the energization to the coil 68 is energized. When turned off, the movable portion 50 moves in the direction in which the valve member 44 separates from the valve seat 42a. Then, in both the suction stroke and the pumping stroke, the discharge amount of the surplus fuel is controlled by controlling the energization of the coil 68.

For example, if it is desired to increase the fuel flow rate flowing through the jet pump 18 and increase the fuel flow rate transferred from the sub tank 14 to the main tank 12 because the remaining fuel amount in the main tank 12 is reduced, the coil 68 is energized. The turn-on time is shortened to increase the flow rate of surplus fuel discharged from the metering valve 40.

On the other hand, when the required pumping amount to the electric feed pump 16 increases, the drive current supplied to the feed pump 16 in order to increase the rotation speed of the feed pump 16 increases, so that the power consumption of the feed pump 16 increases. To do. As the power consumption of the feed pump 16 increases, the fuel consumption increases in order to increase the power generated by the generator.

In order to suppress the increase in the fuel consumption of the feed pump 16, it is desired to suppress the increase in the required pumping amount for the electric feed pump 16 as much as possible. Therefore, it is conceivable to extend the time for turning on the energization of the coil 68 of the metering valve 40 to reduce the amount of excess fuel discharged from the metering valve 40. If the amount of excess fuel discharged from the metering valve 40 is reduced, the required pumping amount to the feed pump 16 is reduced.

Normally, the power consumption of the coil 68 of the metering valve 40 is smaller than the power consumption of the feed pump 16. Therefore, even if the power consumption of the metering valve 40 is increased by lengthening the time for turning on the energization of the coil 68 of the metering valve 40, the reduction amount of the power consumption of the feed pump 16 is larger. .. As a result, the increase in fuel consumption can be suppressed as a whole.

(2) No pressure feed at high speed When the engine is rotating at high speed and the required pressure feed amount to the fuel injection pump 20 is 0, the metering valve 40 is in a state of being opened during the entire period of the pressure feed stroke. .. In this case, it is conceivable to leave the energization of the coil 68 off to increase the amount of surplus fuel discharged.

As a result, the movement of the plunger 34 in the pressurizing direction reduces the fuel flow rate returned to the fuel flow path 204 side, so that the pressure pulsation generated on the low pressure side of the fuel can be reduced.
(3) Pumping at high speed Even if the engine rotates at high speed and the period of the suction stroke is shortened, it is required to suck the fuel of the required flow rate from the fuel flow path 204 into the pressurizing chamber 206. In this case, it is conceivable to turn on the energization of the coil 68 in the suction stroke to reduce the amount of surplus fuel discharged to zero.

As a result, a part of the fuel sucked from the fuel flow path 204 into the pressurizing chamber 206 in the suction stroke is not discharged from the fuel discharge flow path 218, and the fuel pressure on the fuel space 212 side rises. As a result, even if the period of the suction stroke is shortened, the required flow rate of fuel flows from the fuel flow path 204 into the pressurizing chamber 206.

(4) High-load rotation at high speed When the engine rotates at high speed under high load, the temperature of the surplus fuel discharged from the common rail or the engine side rises. In this case, it is conceivable to lengthen the time for turning off the energization of the coil 68 to increase the amount of excess fuel discharged from the metering valve 40.

Normally, the temperature of the surplus fuel discharged from the metering valve 40 is lower than the temperature of the surplus fuel discharged from the common rail or the engine side. Therefore, by increasing the amount of surplus fuel discharged from the metering valve 40, it is possible to suppress an increase in the temperature of the entire surplus fuel.

In the energization control to the coil 68 described above, as shown in FIGS. 8 and 9, when the energization to the coil 68 is off, the movable portion 50 is at the position indicated by the solid line, and thus is from the fuel discharge flow path 218. Excess fuel is discharged. When the coil is energized to 68, the movable portion 50 is at the position indicated by the alternate long and short dash line, so that excess fuel is not discharged from the fuel discharge flow path 218.

8 and 9 schematically show the relationship between switching the energization of the coil 68 on and off and opening and closing the fuel discharge flow path 218 by the movable portion 50, and the actual movable portion 50 And the configuration of the fuel discharge flow path 218 is different.

As shown in FIG. 10, the flow path area 400 of the fuel discharge flow path 218 changes to either 0 or the maximum by switching the energization of the coil to 68 on and off.
On the other hand, as shown in the characteristic 402 shown in FIG. 11, the flow path area of the fuel discharge flow path 218 may be variably controlled by duty-controlling the energization of the coil 68 between 0 and 100%. .. By variably controlling the flow path area of the fuel discharge flow path 218, the amount of fuel discharged from the fuel discharge flow path 218 is variably controlled.

The reciprocating movement position of the movable portion 50 is such that the valve member 44 is seated on the valve seat 42a and the valve member 44 is separated from the valve seat 42a by controlling the energization of the coil 68 on, off, or duty. It changes in both the sitting state and the sitting state.

[1-3. Desirable configuration of the first embodiment]
In the configuration of the first embodiment, when the position of the rod 52 in the rotation direction shifts, the energization of the coil 68 is turned off, and the rod 52 is positioned at the reciprocating movement position where the communication passage 216 and the fuel discharge flow path 218 communicate with each other. Even so, the communication passage 216 and the fuel discharge passage 218 may not communicate with each other, and the surplus fuel may not be discharged.

Therefore, as shown in FIG. 12, a flat surface portion 54a is formed on the outer peripheral surface of the movable core 54, or as shown in FIG. 13, a flat surface portion 52a is formed on the outer peripheral surface of the rod 52 to form the movable portion 50. It is desirable to prevent the rotation of the.

When the flat surface portion 54a is formed on the movable core 54, the flat surface portion 54a is in contact with the flat surface portion 54a at a circumferential position corresponding to the flat surface portion 54a on the inner peripheral surface of the magnetic member 62 that reciprocally supports the movable core 54. The part is formed.

When the flat surface portion 52a is formed on the rod 52, the flat surface portion in contact with the flat surface portion 52a is located at a circumferential position corresponding to the flat surface portion 52a on the inner peripheral surface of the valve body 56 that supports the rod 52 so as to be reciprocally movable. It is formed.

In the first embodiment, the fuel flow path 214, the communication passage 216, and the fuel discharge flow path 218 correspond to fuel flow paths in which the inlet and the outlet from which the surplus fuel is discharged are different. Further, the coil 68 corresponds to the drive unit, and the ECU 100 corresponds to the control unit.

Further, only the metering valve 40 may correspond to the metering device, or the metering valve 40 and the ECU 100 may correspond to the metering device.
[1-4. effect]
According to the first embodiment described above, the following effects can be obtained.

(1a) The surplus fuel of the metering valve 40 passes through a fuel flow path having a different inlet and outlet formed by the fuel flow path 214, the communication passage 216, and the fuel discharge flow path 218, and the fuel flow flows from the inlet to the outlet. It is discharged from the metering valve 40 without returning to or backflowing. Therefore, the foreign matter inside the metering valve 40 does not stay inside the metering valve 40 and is easily discharged from the metering valve 40.

(1b) By controlling the energization of the coil 68, the surplus fuel is discharged from the metering valve 40 through the fuel flow path 214, the communication passage 216, and the fuel discharge flow path 218, so that the surplus fuel is discharged. There is no need to add new parts for this.

(1c) The length of time for turning off or on the energization of the coil 68 during a period not related to the metering control for controlling the valve closing timing of the metering valve 40 and adjusting the pumping amount of the fuel injection pump 20. By controlling the pump, the required amount of surplus fuel can be discharged from the metering valve 40. As the time to turn off the energization of the coil 68 becomes longer, the amount of excess fuel discharged increases.

(1d) When the duty of energization of the coil 68 is controlled, the surplus fuel of the required emission amount can be discharged from the metering valve 40 by setting the duty according to the required emission amount.

[2. Second Embodiment]
[2-1. Differences from the first embodiment]
Since the basic configuration of the second embodiment is the same as that of the first embodiment, the differences will be described below. It should be noted that the same reference numerals as those in the first embodiment indicate substantially the same configuration, and the preceding description will be referred to.

In the second embodiment, the configuration of the fuel flow path for discharging excess fuel from the metering valve is different from the configuration of the fuel flow path of the first embodiment described above.
As shown in FIGS. 14 and 15, in the metering valve 80 of the second embodiment, the rod 92 of the movable portion 90 projects from the movable core 54 to the side where the coil 68 is energized and extends to the moving side. It has a protruding portion 94.

A fuel discharge flow path 230 is formed in the stopper 96 of the spring 60 and the fixed core 66. Further, on the inner peripheral surface of the fixed core 66, a communication passage 232 that communicates the fuel space 220 with the internal space of the fixed core 66 around the protrusion 94 by a groove extending in the axial direction from the opening end on the movable core 54 side. Is formed.

Then, as shown in FIG. 14, when the energization of the coil 68 is off, the rod 92 is separated from the stopper 96 by the load received from the spring 60, so that the surplus fuel of the metering valve 80 enters the fuel flow path 214. Then, the fuel is discharged from the communication passages 222 and 232 to the fuel discharge flow path 202 with the fuel discharge flow path 230 different from the fuel flow path 214 as an outlet.

As shown in FIG. 15, when the coil 68 is energized, the rod 92 moves toward the stopper 96 side together with the movable core 54 and closes the fuel discharge flow path 230 at the end surface of the protrusion 94. Therefore, the surplus fuel is not discharged from the metering valve 80.

In the second embodiment, the fuel flow path 214, the communication passages 222, 232, and the fuel discharge flow path 230 correspond to fuel flow paths in which the inlet and the outlet for discharging the surplus fuel of the metering valve 80 are different.
[2-2. effect]
According to the second embodiment described above, in the effects (1a) to (1c) of the first embodiment described above, the metering valve 40 is replaced with the metering valve 80, and the inlet and outlet from which the surplus fuel is discharged It is possible to obtain the effect of replacing the fuel flow paths having different fuel flow paths with the fuel flow path 214, the communication passages 222, 232, and the fuel discharge flow path 230.

Further, according to the second embodiment, the following effects can be obtained.
(2a) Since the rod 92 closes the fuel discharge flow path 230 at the end surface of the protrusion 94, if the energization of the coil 68 is turned on, the fuel discharge flow path 230 is closed regardless of the position of the rod 92 in the rotational direction. Can be done. Therefore, it is not necessary to process the movable core 54 or the rod 92 to prevent the movable portion 90 from rotating.

[3. Third Embodiment]
[3-1. Differences from the second embodiment]
Since the basic configuration of the third embodiment is the same as that of the second embodiment, the differences will be described below. The same reference numerals as those in the second embodiment indicate the same configuration, and the preceding description will be referred to.

In the second embodiment described above, the rod 92 closes the fuel discharge flow path 230 at the end surface of the protrusion 94 of the rod 92.
On the other hand, in the metering valve 110 of the third embodiment shown in FIGS. 16 and 17, the rod 122 of the movable portion 120 closes the fuel discharge flow path 240 on the outer peripheral side surface of the protruding portion 124 in the second embodiment. Is different from.

Specifically, the rod 122 of the movable portion 120 has a protruding portion 124 protruding from the movable core 54 on the stopper 58 side to which the rod 122 moves when the energization of the coil 68 is turned on. A fuel discharge flow path 240 that can communicate with the space on the stopper 58 side of the protrusion 124 is formed on the fixed core 66, the non-magnetic member 64, and the valve body 56. The communication passage 232 communicates the fuel space 220 with the space on the stopper 58 side of the protrusion 124.

As shown in FIG. 16, when the energization of the coil 68 is off, the rod 122 moves to the valve member 44 side by the load received from the spring 60, so that the fuel discharge flow path 240 is on the stopper 58 side of the protrusion 124. The opening communicating with the space is not closed and is opened by the outer peripheral side surface of the protrusion 124. The fuel space 220 and the space on the stopper 58 side of the protrusion 124 are communicated with each other by a communication passage 232.

Therefore, the surplus fuel of the metering valve 110 is discharged to the fuel discharge flow path 202 with the fuel flow path 214 as the inlet, passing through the communication passages 222 and 232, and the fuel discharge flow path 240 different from the fuel flow path 214 as the outlet. Fuel.

As shown in FIG. 17, when the coil 68 is energized, the rod 122 moves to the fixed core 66 side together with the movable core 54 and closes the fuel discharge flow path 240 on the outer peripheral side surface of the protrusion 124. Therefore, the surplus fuel is not discharged from the metering valve 110.

In the third embodiment, the fuel flow path 214, the communication passages 222, 232, and the fuel discharge flow path 240 correspond to fuel flow paths in which the inlet and the outlet for discharging the surplus fuel of the metering valve 110 are different.
[3-2. effect]
According to the third embodiment described above, the metering valves 40 and 80 are the metering valves 110 in the effects (1a) to (1d) of the first embodiment and the effects (2a) of the second embodiment described above. , The movable portions 50 and 90 are replaced with the movable portion 120, the end surface of the protruding portion 94 is replaced with the outer peripheral side surface of the protruding portion 124, and the fuel discharge flow paths 218 and 230 are replaced with the fuel discharge flow paths 240. Can be done.

[4. Fourth Embodiment]
[4-1. Differences from the first embodiment]
Since the basic configuration of the fourth embodiment is the same as that of the first embodiment, the differences will be described below. It should be noted that the same reference numerals as those in the first embodiment indicate the same configuration, and the preceding description will be referred to.

In the first embodiment described above, a fuel flow path 214 and a communication passage 216 for discharging excess fuel are formed between the outer peripheral surface of the rod 52, which is the outer side of the rod 52, and the inner peripheral surface of the valve body 56. Has been done.

On the other hand, the fourth embodiment shown in FIG. 18 is different from the first embodiment in that a fuel flow path 250 for discharging excess fuel is formed inside the rod 132 of the movable portion 130.
The fuel flow path 250 is formed so as to extend in the axial direction of the rod 132, and communicates with the fuel space 212 regardless of the position of the rod 132 in the reciprocating movement direction. Further, the fuel flow path 250 extends radially toward the outer peripheral surface of the rod 132 at a position separated in the axial direction and opens to the outer peripheral surface of the rod 132.

An annular fuel discharge flow path 252 and a fuel discharge flow path 254 that communicate with the fuel discharge flow path 252 and discharge surplus fuel to the fuel discharge flow path 202 are formed on the inner peripheral surface of the valve body 56. ..
When the energization of the coil 68 is off, the rod 132 is in the position shown in FIG. 14, so that the fuel flow path 250 and the fuel discharge flow path 252 communicate with each other regardless of the position of the rod 132 in the rotational direction. Therefore, the surplus fuel of the metering valve 40 is discharged from the fuel discharge flow path 252 to the fuel discharge flow path 202 by using the fuel discharge flow path 254 different from the fuel flow path 250 as an outlet. ..

When the coil 68 is energized, the rod 132 moves from the position shown in FIG. 14 to the fixed core 66 side together with the movable core 54, so that the communication between the fuel flow path 250 and the fuel discharge flow path 252 is made by the rod 132. It is blocked by the outer peripheral surface. Therefore, the surplus fuel of the metering valve 40 is not discharged from the fuel flow path 250 through the fuel discharge flow paths 252 and 254 to the fuel discharge flow path 202.

In the fourth embodiment, the fuel flow path 250 and the fuel discharge flow paths 252 and 254 correspond to fuel flow paths in which the inlet and the outlet for discharging the surplus fuel of the metering valve 40 are different.
[4-2. effect]
According to the fourth embodiment described above, in the effects (1a) to (1d) of the first embodiment described above, the fuel flow path in which the inlet and the outlet from which the surplus fuel is discharged is different from each other is referred to as the fuel flow path 250. The effect of replacing the fuel discharge channels 252 and 254 can be obtained.

Further, according to the fourth embodiment, the following effects can be obtained.
(4a) When the energization of the coil 68 is off, the fuel flow path 250 and the fuel discharge flow path 252 communicate with each other regardless of the position of the rod 132 in the rotational direction, so that the surplus fuel of the metering valve 40 is discharged. be able to. Therefore, it is not necessary to process the rod 132 or the movable core 54 to prevent the movable portion 130 from rotating.

[5. Fifth Embodiment]
[5-1. Differences from the first embodiment]
Since the basic configuration of the fifth embodiment is the same as that of the first embodiment, the differences will be described below. It should be noted that the same reference numerals as those in the first embodiment indicate the same configuration, and the preceding description will be referred to.

In the first embodiment described above, the flow path area of the fuel discharge flow path 218 formed in the valve body 56 is the inside of the valve body 56 and the opening on the inner peripheral surface side of the valve body 56 opened and closed by the rod 52. It is the same as the department.

On the other hand, in the fifth embodiment, as shown in FIGS. 19 and 20, the fuel is larger than the flow path area of the fuel discharge flow path 260 formed inside the valve body that supports the rod 140 so as to be reciprocally movable. The flow path area of the opening 262 in which the discharge flow path 260 opens to the inner peripheral surface side of the valve body is large.

The amount of movement of the rod 140 in the reciprocating movement direction when switching the energization of the coil 68 on and off is the same as that of the rod 52 of the first embodiment.
When the coil 68 is off, the rod 140 is in the position shown by the solid line in FIGS. 19 and 20. When the energization to the coil 68 is off, if the flow path area of the actual opening 262a of the opening 262 not covered by the rod 140 is S1 and the flow path area of the fuel discharge flow path 260 is S2, then S1 ≦ S2. is there. Further, assuming that the flow path area of the fuel discharge flow path 218 of the first embodiment is S0, S0 <S1.

The length of the opening 262 in the direction intersecting the reciprocating movement direction of the rod 140 is set so that S0 <S1 ≦ S2.
When the energization to the coil 68 is off, the flow path area of the actual opening 262a is smaller than the flow path area of the fuel discharge flow path 260, so that the fuel flow rate flowing through the actual opening 262a and the fuel discharge flow path 260 is determined. It is determined by the flow path area of the actual opening 262a. The flow path area of the actual opening 262a is also referred to as the minimum flow path area.

As shown in FIG. 21, since the minimum flow path area 410 when the energization of the coil 68 is off is larger than the flow path area 400 of the fuel discharge flow path 218 of the first embodiment, the metering is performed in the fifth embodiment. The amount of surplus fuel discharged from the valve is larger than the amount of surplus fuel discharged from the metering valve in the first embodiment.

When the coil 68 is energized, the rod 140 moves with the movable core 54 and is in the position shown by the alternate long and short dash line in FIGS. 19 and 20. In this case, since the opening 262 is covered and closed by the rod 140, the excess fuel of the metering valve is not discharged from the fuel discharge flow path 260.

Further, in the fifth embodiment, when the energization of the coil 68 is off, the flow path area of the actual opening 262a of the fuel discharge flow path 260 is the flow path of the opening of the fuel discharge flow path 218 of the first embodiment. Larger than the area. Therefore, when the duty of the coil 68 is controlled instead of being turned on and off, it is easy to variably control the flow path area according to the duty, as shown by the characteristic 412 of FIG.

In the fifth embodiment, the fuel discharge flow path 260 corresponds to a fuel flow path in which the inlet and the outlet for discharging the surplus fuel of the metering valve are different.
[5-2. effect]
According to the fifth embodiment described above, in the effects (1a) to (1d) of the first embodiment described above, the fuel discharge flow path 260 has a fuel flow path in which the inlet and the outlet where the surplus fuel is discharged are different. You can get the effect of replacing with.

Further, according to the fifth embodiment, the following effects can be obtained.
(5a) When the coil 68 is not energized, the flow path area 410 of the fuel flow path for discharging the surplus fuel in the fifth embodiment is the flow path area of the fuel flow path for discharging the surplus fuel in the first embodiment. Greater than 400. Therefore, if the amount of movement of the rod of the movable portion in the reciprocating direction is the same, in the fifth embodiment, more surplus fuel can be discharged from the fuel discharge flow path 260 than in the first embodiment.

(5b) When the energization of the coil 68 is day-controlled, the amount of excess fuel discharged per unit time discharged from the fuel discharge flow path 260 can be easily and variably controlled by duty control.

[6. 6th Embodiment]
[6-1. Differences from the fifth embodiment]
Since the basic configuration of the sixth embodiment is the same as that of the fifth embodiment, the differences will be described below. The same reference numerals as those in the fifth embodiment indicate the same configuration, and the preceding description will be referred to.

In the fifth embodiment described above, when the energization of the coil 68 is turned on, the opening 262 is covered with the rod 140 and closed, so that the surplus fuel of the metering valve is not discharged from the fuel discharge flow path 260.

On the other hand, in the sixth embodiment shown in FIG. 23, when the coil 68 is energized, the actual opening 262b, which is a part of the opening 262 of the fuel discharge flow path 260, is covered with the rod 140. Not closed. Therefore, even if the energization of the coil 68 is turned on, the surplus fuel of the metering valve is discharged from the actual opening 262b through the fuel discharge flow path 260.
In this case, as shown by the minimum flow path area 420 in FIG. 24, the actual opening 262b when the energization of the coil 68 is turned on functions as an orifice that narrows the flow path of the fuel discharge flow path 260.

Further, in the sixth embodiment, the flow path area S0 of the fuel discharge flow path 218 of the first embodiment and the flow path area S1 of the actual opening 262a of the opening 262 when the energization to the coil 68 is off. The relationship between the fuel discharge flow path 260 and the flow path area S2 is S0 <S1 ≦ S2, as in the fifth embodiment and the figure. Therefore, when the duty of energization of the coil 68 is controlled, it is easy to variably control the flow path area according to the duty, as shown by the characteristic 422 of FIG.

[6-2. effect]
According to the sixth embodiment described above, the following effects can be obtained in addition to the effects of the fifth embodiment described above.

(6a) Since the actual opening 262b when the energization of the coil 68 is turned on functions as an orifice that narrows the flow path of the fuel discharge flow path 260, the orifice 22 shown in FIG. 1 is abolished in the first embodiment. be able to.

[7. Seventh Embodiment]
[7-1. Differences from the fifth embodiment]
Since the basic configuration of the seventh embodiment is the same as that of the fifth embodiment, the differences will be described below. The same reference numerals as those in the fifth embodiment indicate the same configuration, and the preceding description will be referred to.

In the fifth embodiment described above, the opening 262 in which the fuel discharge flow path 260 opens on the inner peripheral surface side of the valve body is formed in a rectangular shape.
On the other hand, in the seventh embodiment shown in FIG. 26, the rod 140 moves to the fixed core side 66 side together with the movable core 54 in the opening 272 in which the fuel discharge flow path 270 opens to the inner peripheral surface side of the valve body. It is formed in a trapezoidal shape that tapers according to the situation.

In the seventh embodiment, the flow path area S0 of the fuel discharge flow path 218 of the first embodiment, the flow path area S1 of the actual opening 272a of the opening 272 when the energization to the coil 68 is off, and the fuel discharge. The relationship of the flow path 270 with the flow path area S2 is S0 <S1 ≦ S2.

With such a configuration, as shown in FIG. 27, in the characteristic 430 of the seventh embodiment showing the relationship between the duty for controlling the energization of the coil 68 and the minimum flow path area, the coil is compared with the characteristic 412 of the fifth embodiment. As the duty for energizing 68 increases from 0% to 100% and the minimum flow path area becomes smaller, the rate of decrease in the minimum flow path area decreases.

On the other hand, in the case of the fifth embodiment described above, the reduction rate of the flow path area is constant even if the duty for energizing the coil 68 is increased from 0% to 100% as shown in the characteristic 412 shown in FIG. Is.

In the seventh embodiment, the fuel discharge flow path 270 corresponds to a fuel flow path in which the inlet and the outlet for discharging the surplus fuel of the metering valve are different.
[7-2. effect]
According to the seventh embodiment described above, in the effect of the fifth embodiment described above, the effect of replacing the fuel discharge flow path 260 with the fuel discharge flow path 270 can be obtained.

Further, according to the seventh embodiment, the following effects can be obtained.
(7a) As the duty for energizing the coil 68 increases from 0% to 100% and the minimum flow path area decreases, the rate of decrease in the minimum flow path area decreases, so that the fuel is discharged from the fuel discharge flow path 270. When the amount of surplus fuel discharged is small, the amount of surplus fuel discharged can be duty-controlled with high accuracy.

[8. 8th Embodiment]
[8-1. Differences from the 7th embodiment]
Since the basic configuration of the eighth embodiment is the same as that of the seventh embodiment, the differences will be described below. The same reference numerals as those in the seventh embodiment indicate the same configuration, and the preceding description will be referred to.

In the seventh embodiment described above, the opening 272 in which the fuel discharge flow path 270 opens to the inner peripheral surface side of the valve body is a platform that tapers as the rod 140 moves to the fixed core side 66 side together with the movable core 54. It is formed in a shape.

On the other hand, in the eighth embodiment shown in FIG. 28, the rod 140 moves to the fixed core side 66 side together with the movable core 54 in the opening 282 in which the fuel discharge flow path 280 opens to the inner peripheral surface side of the valve body. It is formed in a trapezoidal shape that becomes thicker according to the tip.

In the eighth embodiment, the flow path area S0 of the fuel discharge flow path 218 of the first embodiment, the flow path area S1 of the actual opening 282a of the opening 282 when the energization to the coil 68 is off, and the fuel discharge. The relationship of the flow path 280 with the flow path area S2 is S0 <S1 ≦ S2.

With such a configuration, as shown in FIG. 29, the characteristic 440 of the eighth embodiment showing the relationship between the duty for controlling the energization of the coil 68 and the minimum flow path area has a duty with respect to the characteristic 412 of the fifth embodiment. Decreases from 100% to 0%, and as the minimum flow path area increases, the rate of increase in the minimum flow path area decreases.

In the eighth embodiment, the fuel discharge flow path 280 corresponds to a fuel flow path in which the inlet and the outlet for discharging the surplus fuel of the metering valve are different.
[8-2. effect]
According to the eighth embodiment described above, in the effect of the fifth embodiment described above, the effect of replacing the fuel discharge flow path 260 with the fuel discharge flow path 280 can be obtained.

Further, according to the eighth embodiment, the following effects can be obtained.
(8a) As the duty for energizing the coil 68 decreases from 100% to 0% and the minimum flow path area increases, the rate of increase in the minimum flow path area decreases, so that the fuel is discharged from the fuel discharge flow path 280. When the amount of surplus fuel discharged is large, the amount of surplus fuel discharged can be duty-controlled with high accuracy.

[9. Other embodiments]
Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above embodiments and can be implemented in various modifications.

(9a) In the above embodiment, by controlling the energization of the coil 68, the reciprocating moving position of the movable portion of the metering valve is changed, and the flow rate of the surplus fuel discharged from the metering valve is controlled.
On the other hand, if the metering valve has a fuel flow path that passes through at least one of the outside and the inside of the movable part and has a different inlet and outlet for discharging surplus fuel, the metering valve Excess fuel of the metering valve may be discharged from the fuel flow path regardless of the reciprocating position of the moving portion.

(9b) In the above embodiment, the movable portion of the metering valve and the valve member are formed of separate members, and the movable portion and the valve member can be moved separately. On the other hand, by changing the reciprocating movement position of the movable part of the metering valve, the flow rate of the surplus fuel discharged from the metering valve may be simply opened and closed in the fuel flow path for discharging the surplus fuel. The movable portion of the metering valve and the valve member may be integrally reciprocated as long as they can be controlled by including them.

(9c) In the first to fifth embodiments, the seventh embodiment, and the eighth embodiment described above, when the energization to the coil 68 is off, excess fuel is discharged from the metering valve to the coil 68. When the power is on, the excess fuel is not discharged from the metering valve.

On the other hand, depending on the relationship between the reciprocating position of the movable part and the position of the opening of the fuel discharge flow path opened and closed by the movable part, when the coil 68 is energized, excess fuel is discharged from the metering valve. However, when the energization of the coil 68 is off, the excess fuel may not be discharged from the metering valve.

(9d) In the above embodiment, a fuel flow path for discharging excess fuel of the metering valve is formed through either the outside or the inside of the movable portion.
On the other hand, a fuel flow path for discharging excess fuel of the metering valve may be formed through both the outside and the inside of the movable portion.

(9e) In the above embodiment, the coil 68 is used as a drive unit for reciprocating the movable unit. On the other hand, when switching whether to discharge excess fuel from the metering valve or not by turning the energization on and off, a piezoelectric element may be used as the drive unit.

(9f) A plurality of functions possessed by one component in the above embodiment may be realized by a plurality of components, or one function possessed by one component may be realized by a plurality of components. .. Further, a plurality of functions possessed by the plurality of components may be realized by one component, or one function realized by the plurality of components may be realized by one component. Further, a part of the configuration of the above embodiment may be omitted. In addition, at least a part of the configuration of the above embodiment may be added or replaced with the configuration of the other above embodiment.

(9g) In addition to the metering device described above, the present disclosure can be realized in various forms such as a system having the metering device as a component.

2: Fuel injection system, 20: Fuel injection pump, 34: Plunger, 40, 80, 110: Metering valve (metering device), 42a: Valve seat, 44: Valve member, 50, 90, 120, 130: Movable Unit, 52, 92, 122, 132, 140: Rod (movable part), 54: Movable core (movable part): 68: Coil (drive unit), 100: ECU (control unit, metering device), 206: Addition Pressure chamber, 214, 250: Fuel flow path, 216, 222, 232: Continuous passage (fuel flow path), 218, 230, 240, 252, 254, 260, 270, 280: Fuel discharge flow path (fuel flow path)

Claims (9)

A metering device (40, 80, 110) that regulates the flow rate of fuel pumped from the fuel injection pump (20).
Valve seat (42a) and
By leaving the valve seat, the fuel is sucked into the pressurizing chamber in the suction stroke in which the plunger (34) moves in the direction opposite to the pressurizing direction for pressurizing the fuel in the pressurizing chamber (206), and the plunger is sucked. The valve member (44), in which the fuel in the pressurizing chamber is pressurized by the plunger and pumped by being seated on the valve seat in the pumping stroke in which the fuel in the pressurizing direction moves.
Drive unit (68) and
The position changes by controlling the energization of the drive unit, and the movable unit (50) that switches whether the valve member sits on the valve seat or leaves the valve seat by changing the position. , 90, 120, 130, 140),
Fuel flow paths (214 to 218, 222, 230, 232, 240, 250 to 254, 260, 270) that pass through at least one of the inside and the outside of the movable portion and have different inlets and outlets from which excess fuel is discharged. 280) and
Metering device. The metering device according to claim 1.
The amount of excess fuel discharged through the fuel flow path is controlled by the change in the position of the movable portion.
Metering device. The metering device according to claim 1 or 2.
The valve member and the movable portion are separate members.
Metering device. The metering device according to claim 3.
The position of the movable portion is controlled by energization of the drive portion regardless of whether the valve member is seated on the valve seat or the valve member is separated from the valve seat. It changes by being done,
Metering device. The metering device according to claim 3 or 4.
In the pressure feeding stroke, the valve member is seated on the valve seat by moving the movable portion when the energization to the drive portion is turned on, and in the suction stroke, the valve is seated regardless of the position of the movable portion. Leave the seat,
Metering device. The metering device according to any one of claims 3 to 5.
When the valve member is seated on the valve seat in the pressure feeding stroke, the valve member is seated on the valve seat until the suction stroke is started, regardless of the energization control to the drive unit.
Metering device. The metering device according to any one of claims 3 to 6.
In both the suction stroke and the pressure feeding stroke, the movable portion moves in the direction in which the valve member is seated on the valve seat when the energization to the drive portion is turned on, and the energization to the drive portion is applied. When turned off, the valve member moves in a direction away from the valve seat.
Metering device. The metering device according to any one of claims 3 to 7.
The flow path area of the fuel flow path changes according to the position of the movable portion.
Metering device. The metering device according to any one of claims 3 to 8.
A control unit (100) for controlling energization of the drive unit is further provided.
The control unit controls the energization of the drive unit in at least one of the suction stroke and the pumping stroke, so that the position of the movable portion can be changed without changing the position of the valve member. Change,
Metering device.

Images