KR101603643B1 - Control appartus and mehtod of flow control valve for high presure fuel pump - Google Patents

Abstract

The present invention relates to a control apparatus and method for a flow control valve for a high-pressure fuel pump, in which an operation cycle of a flow control valve generates a magnetic field to move a plunger provided on a solenoid to a core side to supply a current to the coil to close the flow control valve A hold time for maintaining the closed flow control valve in a closed state and a drop time for opening the flow control valve by reducing a current applied to the coil in an open operation, The controller controls the current applied to the coil so as to attenuate noise and vibration due to the collision between the plunger and the core by adjusting the amount of current applied to the coil of the flow control valve It is possible to attenuate the noise and vibration due to the collision between the plunger and the core during the closing operation of the flow control valve The effect is obtained.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a control apparatus for a high-pressure fuel pump,

The present invention relates to a control apparatus and method for controlling a flow rate control valve for a high-pressure fuel pump, and more particularly, to a control apparatus and method for controlling a flow rate control valve for a high-pressure fuel pump, To a control device and a control method of a flow control valve for a high-pressure fuel pump.

Gasoline Direct Injection type engine technology is being developed to improve fuel efficiency and performance of gasoline engines.

In a conventional gasoline engine, power is generated by a suction / compression / ignition / explosion / exhaust process of an air / fuel mixture, whereas a direct injection gasoline engine sucks and compresses air and injects fuel .

This approach is similar to the compression ignition method of a diesel engine.

Therefore, the direct injection type gasoline engine can realize a high compression ratio exceeding the limit of the compression ratio of a conventional gasoline engine, thereby maximizing fuel economy.

In such a direct injection gasoline engine, fuel pressure becomes a very important factor, and a high-performance high-pressure fuel pump is required for this.

For example, the present applicant has filed and filed a high pressure fuel pump for a direct injection type gasoline engine in many of the following Patent Documents 1 and 2 and the like.

The high-pressure fuel pump for a direct injection type gasoline engine according to the related art is mounted on an engine camshaft, the pump shaft is rotated by the rotation force of the cam, and the piston of the pump is driven by the rotational force to generate a pressure to inject gasoline fuel into the injector .

To this end, a high-pressure fuel pump for direct injection type gasoline engine according to the prior art is provided with a flow control valve for controlling the opening and closing operation of the inlet-side check valve to control the discharge flow rate of the high-pressure fuel pump.

Generally, a solenoid valve that operates in an electromagnetic manner by a coil is applied to the flow control valve.

The solenoid valve is opened in a no-current state, and when a constant voltage is applied to the coil, a magnetic field is generated to close the plunger by linear movement.

Korean Patent Registration No. 10-1171995 (issued on August 8, 2012) Korea Patent Registration No. 10-1182130 (issued on September 12, 2012) Korean Patent Registration No. 10-1361612 (Announcement on February 13, 2014)

However, the solenoid for operating the flow control valve generates vibration and noise due to the impact when the high-pressure fuel pump is driven in the collision between the coil provided on the solenoid and the stopper provided on the inlet-side check valve.

Particularly, since the solenoid generates high-frequency noise while the inlet-side check valve operates in a relatively low-speed section where the engine is relatively quiet, the high-pressure fuel pump according to the related art causes the driver to increase dissatisfaction due to noise.

The high pressure fuel pump for a direct injection type gasoline engine according to the related art has a spring mounting portion provided on the solenoid and is formed as an open type and is coupled to the outside of the body of the high pressure fuel pump so that noise generated during operation is released to the outside of the high pressure fuel pump There was a problem.

In order to solve such a problem, the applicant of the present invention has filed and filed a patent for a flow control valve which minimizes noise and vibration generated during solenoid operation.

However, even when the configuration of Patent Document 3 is applied, there is a limit to completely eliminate the vibration and noise generated in the operation of the actuator.

In addition, the high-pressure fuel pump for the direct injection type gasoline engine according to the prior art has a problem in that when the flow control valve is driven, the current consumption is increased as the solenoid coil is continuously supplied with current and the parts are damaged or damaged due to heat generated in the coil There was a problem.

An object of the present invention is to solve the above problems and provide a control apparatus and method for a flow control valve for a high-pressure fuel pump capable of controlling an amount of current applied to a coil of a flow control valve applied to a high- .

Another object of the present invention is to provide a control apparatus and method for a flow control valve for a high-pressure fuel pump capable of reducing a collision speed between a plunger and a core provided in a flow control valve, .

In order to achieve the above object, in a control apparatus for a flow control valve for a high-pressure fuel pump according to the present invention, an operation cycle of a flow control valve generates a magnetic field to move a plunger provided on a solenoid to a core side, A hold time for holding the closed flow control valve in a closed state, and a current for reducing the current applied to the coil in an open operation to drop the flow control valve, And the current applied to the coil is controlled to attenuate noise and vibration due to collision of the plunger and the core by lowering the operating speed of the plunger during the full-in time.

In order to achieve the above object, a control method of a flow control valve for a high-pressure fuel pump according to the present invention is characterized in that an operation cycle of the flow control valve generates a magnetic field to move the plunger provided on the solenoid to the core side, In time for supplying and holding a current to the coil so as to close the valve, a hold time for maintaining the closed flow control valve in the closed state, and a current applied to the coil in the open operation, And the current applied to the coil is controlled so as to attenuate noise and vibration due to collision between the plunger and the core by lowering the operating speed of the plunger during the full-in time.

As described above, according to the control apparatus and method for controlling the flow rate control valve for a high-pressure fuel pump according to the present invention, the amount of current applied to the coil of the flow rate control valve can be adjusted to prevent collision between the plunger and the core It is possible to attenuate the noise and vibration caused by the vibration.

That is, according to the present invention, when the current applied to the coil reaches the peak current value in the closing operation of the inlet-side check valve, the peak current value is maintained until the closing operation is completed, and when the closing operation is completed, It can be held down.

Therefore, according to the present invention, the operation speed of the plunger provided in the flow control valve is reduced, and the noise and vibration due to the collision between the plunger and the core can be minimized.

1 is a block diagram of a fuel supply system to which a control device for a flow control valve for a high-pressure fuel pump according to a first embodiment of the present invention is applied;
2 is a perspective view of a high-pressure fuel pump applied to the first embodiment of the present invention,
3 is a cross-sectional view of the flow control valve shown in Fig. 2,
4 is a timing chart illustrating a control operation of the flow control valve,
5 is a timing chart illustrating a control operation of the flow control valve for a high-pressure fuel pump according to the second embodiment of the present invention,
6 is a timing chart illustrating a control operation of the flow control valve for a high-pressure fuel pump according to the third embodiment of the present invention,
FIG. 7 is a flowchart for explaining steps of controlling a flow rate control valve for a high-pressure fuel pump according to a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A control device and a control method of a flow control valve for a high-pressure fuel pump according to a preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

Hereinafter, for ease of explanation, the flow control valve provided in the high-pressure fuel pump for direct injection type gasoline engine will be described.

However, it should be noted that the present invention is not necessarily limited to the direct injection type gasoline engine, but may be applied to various types of internal combustion engines, such as a direct injection type LPG engine, in which various fuels are directly pressurized and injected into the combustion chamber .

[First Embodiment]

1 is a block diagram of a fuel supply system to which a control device for a flow control valve for a high-pressure fuel pump according to a preferred embodiment of the present invention is applied.

1, a fuel supply system to which a control apparatus 10 for a flow control valve for a high-pressure fuel pump according to a preferred embodiment of the present invention is applied includes a fuel supply system for injecting gasoline fuel filled in the fuel tank 11 into the engine 15, A high-pressure fuel pump 20 for pressurizing the fuel supplied from the fuel pump 12 to a predetermined high pressure, a delivery pipe 13 for filling the fuel pressurized at a high pressure, An injector 14 for injecting high-pressure fuel into the delivery pipes 13 directly to the respective combustion chambers of the engine 15, a pressure sensor 16 for sensing the pressure of the fuel filled in the delivery pipe 13, And a control unit 17 that controls the driving of the fuel pump 12, the high-pressure fuel pump 20, and the injector 14 based on the target RPM of the engine 15. [

The control device for the control valve for the high-pressure fuel pump according to the present invention is not limited to the configuration of the fuel supply system as described above. The control device for the high-pressure fuel pump may be a pressure regulator for controlling the pressure of the fuel, It should be noted that various components such as a fuel recovery line (R) or a bypass line for recovering the remaining fuel that has been injected into the engine among the supplied fuel to the fuel tank (12) and the fuel flow path may be further provided.

The delivery pipe 13 is provided with a pressure sensor 16 for sensing the pressure of the fuel filled in the delivery pipe 13 and the control unit 17 controls the pressure of the fuel detected by the pressure sensor 16, The operation of the fuel pump 12 and the high-pressure fuel pump 20 can be controlled.

The control unit 17 communicates with the main control unit (not shown) of the vehicle and controls the fuel pump 12, the high-pressure fuel pump 20, and the injector 14 in accordance with the received target RPM. Unit (Electronic Control Unit).

Of course, the control unit 17 may be provided as a separate control unit communicably connected to the electronic control unit.

The configuration and operation of the control unit 17 will be described in detail below with reference to FIG.

Next, the configuration of the high-pressure fuel pump according to the preferred embodiment of the present invention will be described in detail with reference to FIGS. 2 and 3. FIG.

FIG. 2 is a perspective view of a high-pressure fuel pump applied to a preferred embodiment of the present invention, and FIG. 3 is a cross-sectional view of the flow control valve shown in FIG.

2 and 3, the high-pressure fuel pump 20 includes a body 21 having an inlet side and discharge side openings 211 and 212 formed on a side surface thereof, a body 21 coupled to a lower portion of the body 21, A damper portion 24 coupled to the upper portion of the body 21 and reducing the pulsation of the sucked fuel, and a damper portion 24 coupled to the inlet side opening 211, A flow control valve 30 for opening and closing the inlet-side check valve 40 to control the supply flow rate and the discharge pressure, and a discharge-side check valve 25 coupled to the discharge-side opening 212.

The high-pressure fuel pump 20 is coupled between the body 21 and the cam of the engine camshaft (not shown) so as to be integrated with the suction means 22, converts the rotational motion of the cam into a linear reciprocating motion, And a roller tap portion 26 for transferring the latent image to the developing roller 22, as shown in FIG.

The suction means 22 includes a piston 27 which is moved up and down by a linear reciprocating motion of the roller tappet portion 26, a return spring 28 which provides a restoring force to the piston 27 and a return spring 28 and a piston 27 (Not shown).

The flow rate control valve 30 controls the opening and closing operation of the inlet side check valve 40 by the operation of the solenoid 31 so that the fuel conveyed to the flow rate control valve 30 via the damper portion 24 is returned to the inlet side check To the discharge side check valve (25) through the valve (40).

Accordingly, the flow control valve 30 controls the open / close operation of the inlet-side check valve 25 by the operation of the solenoid 31, thereby controlling the supply flow rate of the fuel supplied to the body 21 of the high- The discharge pressure can be adjusted.

3, the flow control valve 30 includes a solenoid 31 for receiving a current and reciprocatingly moving the plunger 32 provided inside the solenoid 31 and a plunger 32 for controlling the flow of the fuel An inlet side check valve 40 for supplying fuel to the discharge side check valve 25 while preventing back flow and a needle 33 for linearly reciprocating and opening and closing the inlet side check valve 40 by the operation of the solenoid 31, A needle guide 34 for guiding the linear reciprocating movement of the needle 33 and a spring 35 provided inside the solenoid 31 and for providing a restoring force to the needle 33. [

The solenoid 31 has a bobbin 37 wound around the outer circumferential surface of the coil 36, a core 38 provided inside the bobbin 37, and a magnetic field generated by supplying current to the coil 36, The plunger 32 may be formed of a metal.

That is, the flow control valve 30 generates a magnetic field when current is supplied to the coil of the solenoid 31 to move the plunger 32 and the needle 33 toward the core 38 to close the inlet-side check valve 40 The plunger 32 and the needle 33 are moved toward the inlet check valve 40 by the restoring force of the spring 35 and the inlet check valve 40 is opened.

The inlet-side check valve 40 includes a body 41 formed in a cylindrical shape having an opened top surface and formed with a filling space filled with fuel at the center, a transfer chamber 42 for transferring the fuel filled in the filling space to the body 21, A stopper 43 coupled to the lower portion of the body 41 and an elastic spring 43 provided between the stopper 43 and the valve body 42 to provide an elastic force to the valve body 42 44).

1, the control unit 17 generates a control signal for controlling the amount of current applied to the coil 36 of the solenoid 31 according to the pressure sensing signal sensed by the pressure sensing sensor 16, and supplies the control signal to the flow control valve 30 Can be controlled.

That is, the control unit 17 controls the flow rate control valve 30 such that it is applied to the coil 36 of the solenoid 31 to minimize the noise and vibration generated by the collision of the plunger 32 and the core 38 during the closing operation of the flow control valve 30 The operation speed of the plunger 32 can be controlled by controlling the intensity of the magnetic field generated in the coil 36 by adjusting the current by varying the voltage of the power supply.

For this, the control unit 17 compares the target RPM received from the main control unit of the vehicle with the sensing pressure of the fuel sensed by the pressure sensing sensor 16, and the comparison result of the comparison unit 18 And a signal generator 19 for generating a control signal to control the operation of the solenoid 31. [

The signal generating section 19 can adjust the amount of current supplied to the coil 36 of the solenoid 31 by varying the voltage based on the comparison result of the comparing section 18. [

For example, FIG. 4 is a timing chart illustrating a control operation of the flow control valve.

FIG. 4 shows the operation cycle of the flow control valve, the voltage of the control signal generated in the signal generator, the current waveform applied to the coil, and the operation state of the valve.

Fig. 4 illustrates two cycles of opening again after the closing operation in the open state of the flow control valve.

The opening and closing cycle of the flow control valve 30 in the present embodiment is such that current is supplied to the coil 36 so as to generate a magnetic field for moving the plunger 32 toward the core 38 in the closing operation of the flow control valve 30 A hold time to hold the closed flow control valve 30 in a closed state and a drop to decrease the amount of current to open the flow control valve 30, It includes a drop time.

Here, the pull-in time and the hold time are work times to which the voltage of the control signal is applied.

The high pressure fuel pump 20 is configured such that the piston 27 provided in the suction means 22 receives the rotational motion of the cam provided on the camshaft of the engine 15 through the roller tappet 26 and reciprocates linearly , The cycle of each cycle for closing and opening the flow control valve 30 can be changed according to the traveling state of the vehicle, in particular, the RPM of the engine 15. [

The flow control valve 30 opens the inlet side check valve 40 in the descending operation of the piston 27 and sucks the fuel into the filling space inside through the damper portion 24. When the piston 27 ascends, The fuel filled in the filling space can be transferred to the inside of the body 24 while the inlet-side check valve 40 is closed to prevent the back flow of the fuel.

The signal generator 19 generates a control signal of a preset peak voltage value during the peak time and the current applied to the coil 36 is set to a peak current value Ip).

For example, FIG. 4 is a timing chart illustrating a control operation of the flow control valve.

FIG. 4 is a graph showing a voltage of a control signal generated in the signal generating unit with respect to the opening / closing cycle of the flow control valve, a current waveform applied to the coil, and an operational state of the valve.

Fig. 4 illustrates two cycles of opening again after the closing operation in the open state of the flow control valve.

4, the open / close cycle of the flow control valve 30 in the present embodiment generates a magnetic field for moving the plunger 32 toward the core 38 in the closing operation of the flow control valve 30 A pull-in time for supplying and holding current to the coil 36 to maintain the closed flow control valve 30 in a closed state and a hold time for holding the closed flow control valve 30 in a closed state, Lt; RTI ID = 0.0 > drop time. ≪ / RTI >

Here, the pull-in time and the hold time are work times to which the voltage of the control signal is applied.

The full-in time may include a peak time for increasing the current by generating a control signal of a preset peak voltage value and a peak hold time for keeping the current constant.

That is, the signal generator 19 generates the control signal of the peak voltage value preset in advance during the peak time, and the current applied to the coil 36 is the peak current value which is preset according to the slope by the resistance value of the coil 36 (Ip).

The signal generator 19 generates a control signal of a pulse width modulation (PWM) signal having a preset duty value during a peak hold time.

Here, the current applied to the coil 36 can fluctuate near the peak current value Ip according to the control signal in the form of PWM signal, and can maintain the peak current value Ip.

In the present embodiment, the peak current value Ip may be set lower than the maximum current value applied to the coil to close the flow control valve in the prior art.

The signal generator 19 generates a control signal by decreasing the duty value by a predetermined set value during the hold time, and the current applied to the coil 36 is gradually decreased from the peak current value to the preset hold current value .

Here, the duty value of the control signal during the hold time may be reduced by about 1 to 10%.

As described above, the present invention can maintain the peak current value until the closing operation is completed when the current applied to the coil at the closing operation of the inlet-side check valve reaches a peak current value set to a value lower than the maximum current value.

In addition, according to the present invention, when the closing operation is completed, the duty value is constantly decreased during the hold time, and the current applied to the coil can be gradually lowered to the hold current value.

Accordingly, the present invention reduces the amount of current applied to the coil during the closing operation of the flow control valve, thereby minimizing the noise and vibration due to the collision between the plunger and the core provided in the flow control valve.

Further, the present invention minimizes the current consumption due to the continuous increase of the current applied to the coil and prevents the overheat of the solenoid, thereby preventing the component from being damaged or damaged in advance.

The signal generating unit 19 blocks the control signal until the dropping time and the next closing operation and the current applied to the coil 36 falls and is completely shut off until the inlet check valve 40 in the closing operation state is opened .

Accordingly, the maximum feed angle of the fuel can be set to about 45 degrees by combining the hold time and the end angle.

As described above, the present invention can minimize the noise and vibration due to the collision between the plunger and the core during the operation of the high-pressure fuel pump by adjusting the amount of current supplied to the solenoid coil provided in the flow control valve of the high-pressure fuel pump.

Meanwhile, in the present embodiment, the current applied to the coil is raised to the peak current value during the pull-in time, and then decreased to the hold current value during the hold time. However, the present invention is not limited thereto.

[Second Embodiment]

5 is a timing chart illustrating a control operation of a flow control valve for a high-pressure fuel pump according to a second embodiment of the present invention

5, in the present embodiment, the opening and closing cycle of the flow control valve 30 generates a magnetic field for moving the plunger 32 toward the core 38 in the closing operation of the flow control valve 30 A pull-in time for supplying and holding current to the coil 36 to maintain the closed flow control valve 30 in a closed state and a hold time for holding the closed flow control valve 30 in a closed state, Lt; RTI ID = 0.0 > drop time. ≪ / RTI >

Wherein the full-in time is a first peak time for increasing a current by generating a control signal of a hold voltage value set to a value lower than a preset peak voltage value, a first peak time for maintaining a current at a hold current value corresponding to the hold voltage value A peak hold time, a second peak time for generating a control signal of the peak voltage value to increase the current, and a second peak hold time for maintaining the current at the peak current value.

That is, the signal generator 19 generates a control signal of a hold voltage value set lower than a preset peak voltage value during the first peak time, and the current applied to the coil 36 is controlled by the resistance value of the coil 36 And rises to a preset hold current value Ih according to the slope.

The signal generator 19 generates a control signal in the form of a PWM signal having a preset duty value during the peak hold time.

Here, the current applied to the coil 36 may vary in the vicinity of the hold current value Ih according to the control signal in the form of a PWM signal, and the hold current value Ip may be maintained.

In the present embodiment, the peak current value Ip is set to be lower than the maximum current value applied to the coil to close the flow control valve in the prior art, and the hold current value Ih is set to a middle value of the peak voltage value Ip Can be set.

The signal generator 19 generates a control signal of a preset peak voltage value during the second peak time and the current applied to the coil 36 is controlled by the peak current value Ip ).

The signal generator 19 generates a PWM (Pulse Width Modulation) signal in the form of a pulse having a preset duty value during the second peak hold time.

Here, the current applied to the coil 36 can fluctuate near the peak current value Ip according to the control signal in the form of PWM signal, and can maintain the peak current value Ip.

The hold time may include a zero duty time for generating a control signal having a duty value of '0' and a hold time for holding a predetermined hold current value.

That is, the signal generating unit 19 generates the control signal of the duty value '0' during the zero duty time, and the current applied to the coil 36 falls.

When the current value reaches a preset hold current value Ih, the signal generating unit 19 generates a control signal having a preset duty value during the hold time, and the current applied to the coil 36 is a hold current (Ih). ≪ / RTI >

Here, the control signal generated during the hold time may have a duty value of about 10 to 20%.

The current applied to the coil 36 may fluctuate around the hold current value Ih.

As described above, according to the present invention, the current applied to the coil during the closing operation of the inlet-side check valve is raised to the peak current value through the hold current value, and when the peak current value is reached, the peak current value is maintained until the closing operation is completed And when the closing operation is completed, it can be held down by the hold current value.

Accordingly, the present invention can minimize the noise and vibration due to the collision between the plunger and the core provided in the flow control valve.

The signal generating unit 19 blocks the control signal until the dropping time and the next closing operation and the current applied to the coil 36 falls and is completely shut off until the inlet check valve 40 in the closing operation state is opened .

Accordingly, the maximum feed angle of the fuel can be set to about 45 degrees by combining the hold time and the end angle.

As described above, the present invention can minimize the noise and vibration due to the collision between the plunger and the core during the operation of the high-pressure fuel pump by adjusting the amount of current supplied to the solenoid coil provided in the flow control valve of the high-pressure fuel pump.

[Third Embodiment]

6 is a timing chart illustrating a control operation of the flow control valve for a high-pressure fuel pump according to the third embodiment of the present invention.

6, in this embodiment, the pull-in time is a peak time for increasing the current by generating a control signal of a hold voltage value set lower than a preset peak voltage value, and a peak for maintaining the current at the hold current value Hold time may be included.

That is, the signal generator 19 generates a control signal of a hold voltage value set lower than a predetermined peak voltage value during the peak time, and the current applied to the coil 36 is a slope due to the resistance value of the coil 36 To the preset hold current value Ih.

The signal generator 19 generates a control signal of a pulse width modulation (PWM) signal having a preset duty value during a peak hold time.

Here, the current applied to the coil 36 may vary in the vicinity of the hold current value Ih according to the control signal in the form of a PWM signal, and the hold current value Ip may be maintained.

In the present embodiment, the peak current value Ip is set to be lower than the maximum current value applied to the coil to close the flow control valve in the prior art, and the hold current value Ih is set to a middle value of the peak voltage value Ip Can be set.

The signal generator 19 generates a control signal having a preset duty value during the hold time and the current applied to the coil 36 can be maintained at the hold current value Ih.

Here, the control signal generated during the hold time may have a duty value of about 10 to 20%.

The current applied to the coil 36 may fluctuate around the hold current value Ih.

As described above, according to the present invention, the current applied to the coil at the closing operation of the inlet-side check valve can be raised to the hold current value to close the inlet-side check valve and maintain the hold current value.

Accordingly, the present invention can reduce the operation speed of the plunger provided in the run flow control valve, thereby minimizing the noise and vibration due to the collision between the plunger and the core.

The signal generating unit 19 blocks the control signal until the dropping time and the next closing operation and the current applied to the coil 36 falls and is completely shut off until the inlet check valve 40 in the closing operation state is opened .

Accordingly, the maximum feed angle of the fuel can be set to about 45 degrees by combining the hold time and the end angle.

As described above, the present invention can minimize the noise and vibration due to the collision between the plunger and the core during the operation of the high-pressure fuel pump by adjusting the amount of current supplied to the solenoid coil provided in the flow control valve of the high-pressure fuel pump.

Next, a method of controlling a flow control valve for a high-pressure fuel pump according to a preferred embodiment of the present invention will be described in detail with reference to FIG.

FIG. 7 is a flow chart for explaining a stepwise control method of a flow control valve for a high-pressure fuel pump according to a preferred embodiment of the present invention.

When the engine 15 is started by operating the ignition key (not shown) in step S10 of FIG. 7, the piston 27 provided in the high-pressure fuel pump 20 is linearly reciprocated by the rotation of the cam provided on the camshaft The high-pressure fuel pump 20 is driven to start the pumping operation (S10).

Then, the control unit 17 communicates with the main control unit of the vehicle and receives the target RPM of the engine (S12).

The control unit 17 calculates the opening and closing time and the opening and closing time of the flow control valve 30 in accordance with the received target RPM and closes the inlet side check valve 40 in the rising operation of the piston 27, Side control valve 30 to open the side check valve 27 (S14). The control signal for adjusting the amount of current applied to the coil 36 of the flow control valve 30 is generated.

4 to 6, the control unit 17 can generate control signals according to the pull-in time, the hold time, and the drop time for each cycle of the operation of the flow control valve 30. [

Accordingly, by controlling the amount of current applied to the coil to control the operation speed of the plunger, noise and vibration due to collision between the plunger and the core can be minimized.

At this time, the pressure sensing sensor 16 senses the pressure of the fuel filled in the delivery pipe 13 and transmits a sensing signal corresponding to the sensed fuel pressure to the control unit 17 (S16).

Then, the control unit 17 compares the sensed fuel pressure with the fuel pressure corresponding to the target RPM (S18).

If it is determined in step S18 that the detected fuel pressure is different from the fuel pressure corresponding to the target RPM, the control unit 17 adjusts the valve opening / closing timing and opening time (S20) The amount of current to be applied to the transistor is continuously controlled.

On the other hand, if the detected fuel pressure and the fuel pressure corresponding to the target RPM are equal to each other as a result of the comparison in the step S18, the controller 17 maintains the valve opening / closing timing and the opening time.

In step S22, the control unit 17 checks whether or not the ignition key is turned off to stop driving the engine 15, and controls to repeat the steps S12 to S22 until the engine 15 is stopped.

If the driving of the engine 15 is stopped as a result of the inspection in the step S22, the control unit 17 stops driving the control device 10 of the flow control valve 30 and terminates.

Through the above-described process, the present invention adjusts the amount of current applied to the coil of the flow control valve to attenuate the noise and vibration due to the collision between the plunger and the core during the closing operation of the flow control valve.

Although the invention made by the present inventors has been described concretely with reference to the above embodiments, the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

The present invention relates to a control device and a control method of a flow control valve for a high-pressure fuel pump that adjusts an amount of current applied to a coil of a flow control valve to attenuate noise and vibration due to collision between the plunger and the core during closing operation of the flow control valve .

10: Control device of flow control valve for high-pressure fuel pump
11: Fuel tank 12: Fuel pump
13: Delivery pipe 14: Injector
15: Engine 16: Pressure sensor
17: control unit 18:
19: Signal generator 20: High-pressure fuel pump
21: Body 211, 212: Inlet side, Outlet side
22: Suction means 23: Bracket
24: damper part 25: discharge side check valve
26: roller tap portion 27: piston
28: return spring 29: retainer
30: Flow control valve 31: Solenoid
32: plunger 33: needle
34: needle guide 35: spring
36: Coil 37: Bobbin
38: core 40: inlet side check valve
41: body 42: valve body
43: Stopper 44: Elastic spring

Claims (13)

A control device for a flow control valve provided in a high-pressure fuel pump,
A pressure sensing sensor for sensing the pressure of the fuel filled in the delivery pipe and
The operation speed of the plunger provided on the solenoid during the opening and closing operation of the flow control valve is adjusted based on the target RPM of the engine received from the main control unit of the vehicle and the sensing signal of the pressure sensing sensor, And a control unit for controlling driving of the flow control valve by controlling a current applied to the coil so as to attenuate vibration,
The control unit may include a comparator for comparing the pressure of the fuel corresponding to the target RPM with the sensing pressure of the fuel sensed by the pressure sensor,
And a signal generator for generating a control signal by calculating an opening and closing time and an opening and closing time of the flow control valve so as to control the operation of the solenoid according to the comparison result of the comparator,
Wherein the operation cycle of the flow control valve is a full-in time in which a current is supplied to the coil to close the flow control valve by moving a plunger provided in the solenoid to the core side by generating a magnetic field, and maintaining the flow control valve in a closed state And a drop time for opening the flow control valve by reducing the hold time and the current applied to the coil,
The signal generator generates a control signal of a peak voltage value that is preset to increase the current applied to the coil during the peak time by dividing the pull-in time by a peak time and a peak hold time,
Generating a control signal in the form of a PWM control signal having a preset duty value during the peak hold time,
A control signal is generated by decreasing the duty value by a predetermined set value so as to gradually decrease the current applied to the coil during the hold time to a preset hold current value
And controls the current applied to the coil to lower the operating speed of the plunger during the pull-in time so as to attenuate noise and vibration due to collision between the plunger and the core. . delete delete delete A control device for a flow control valve provided in a high-pressure fuel pump,
A pressure sensing sensor for sensing the pressure of the fuel filled in the delivery pipe and
The operation speed of the plunger provided on the solenoid during the opening and closing operation of the flow control valve is adjusted based on the target RPM of the engine received from the main control unit of the vehicle and the sensing signal of the pressure sensing sensor, And a control unit for controlling driving of the flow control valve by controlling a current applied to the coil so as to attenuate vibration,
The control unit may include a comparator for comparing the pressure of the fuel corresponding to the target RPM with the sensing pressure of the fuel sensed by the pressure sensor,
And a signal generator for generating a control signal by calculating an opening and closing time and an opening and closing time of the flow control valve so as to control the operation of the solenoid according to the comparison result of the comparator,
Wherein the operation cycle of the flow control valve is a full-in time in which a current is supplied to the coil to close the flow control valve by moving a plunger provided in the solenoid to the core side by generating a magnetic field, and maintaining the flow control valve in a closed state And a drop time for opening the flow control valve by reducing the hold time and the current applied to the coil,
The signal generator may be configured to increase the pull-in time to a first peak time to increase the current to a preset hold current value, a first peak hold time to maintain the current at the hold current value, A second peak hold time for holding the second peak time and the current at the peak current value, and a control signal of a hold voltage value set to a value lower than a preset peak voltage value for increasing the current during the first peak time And,
Generating a control signal in the form of a PWM signal having a preset duty value during the first peak hold time,
Generating a control signal of the peak voltage value during the second peak time,
Generating a control signal in the form of a PWM signal having a preset duty value during the second peak hold time,
The hold current value is set to a middle value of the peak current value
And controls the current applied to the coil to lower the operating speed of the plunger during the pull-in time so as to attenuate noise and vibration due to collision between the plunger and the core. . 6. The method of claim 5,
The signal generator divides the hold time into a zero duty time and a hold time and generates a control signal having a duty value of '0' to lower the current to a preset hold current value during the zero duty time,
And generates a control signal having a preset duty value to hold the hold current value during the hold time. A control device for a flow control valve provided in a high-pressure fuel pump,
A pressure sensing sensor for sensing the pressure of the fuel filled in the delivery pipe and
The operation speed of the plunger provided on the solenoid during the opening and closing operation of the flow control valve is adjusted based on the target RPM of the engine received from the main control unit of the vehicle and the sensing signal of the pressure sensing sensor, And a control unit for controlling driving of the flow control valve by controlling a current applied to the coil so as to attenuate vibration,
The control unit may include a comparator for comparing the pressure of the fuel corresponding to the target RPM with the sensing pressure of the fuel sensed by the pressure sensor,
And a signal generator for generating a control signal by calculating an opening and closing time and an opening and closing time of the flow control valve so as to control the operation of the solenoid according to the comparison result of the comparator,
Wherein the operation cycle of the flow control valve is a full-in time in which a current is supplied to the coil to close the flow control valve by moving a plunger provided in the solenoid to the core side by generating a magnetic field, and maintaining the flow control valve in a closed state And a drop time for opening the flow control valve by reducing the hold time and the current applied to the coil,
The signal generator divides the pull-in time into a peak time and a peak hold time, generates a control signal of a preset hold voltage value to increase the current to a preset hold current value during the peak time,
Generates a control signal in the form of a PWM control signal having a preset duty value during the peak hold time and the hold time,
The hold current value is set to a middle value of a preset peak current value
And controls the current applied to the coil to lower the operating speed of the plunger during the pull-in time so as to attenuate noise and vibration due to collision between the plunger and the core. . A control method for a flow control valve provided in a high-pressure fuel pump,
(a) driving the high-pressure fuel pump by rotating the cam provided on the camshaft when the engine is started,
(b) comparing the pressure of the fuel corresponding to the target RPM of the engine with the pressure of the fuel filled in the delivery pipe, and
(c) calculating an opening / closing time and an opening / closing time of the flow control valve based on a result of the comparison in the step (b); and
(d) controlling an opening and closing operation of the flow control valve based on the result calculated in the step (c)
Wherein the operation cycle of the flow control valve is a full-in time in which a current is supplied to the coil to close the flow control valve by moving a plunger provided in the solenoid to the core side by generating a magnetic field, and maintaining the flow control valve in a closed state And a drop time for opening the flow control valve by reducing the hold time and the current applied to the coil,
The step (d) includes the steps of: (d1) generating a control signal of a peak voltage value that is preset to increase the current during the peak time by dividing the pull-in time by a peak time and a peak hold time,
(d2) generating a control signal in the form of a PWM control signal having a preset duty value during the peak hold time,
(d3) generating a control signal by decreasing the duty value by a preset current value so as to gradually decrease the current to the preset hold current value during the hold time, and
(d4) generating a control signal to interrupt the current applied to the coil during the drop time
And controlling the current applied to the coil to lower the operating speed of the plunger during the pull-in time so as to attenuate noise and vibration due to the collision between the plunger and the core. . delete delete A control method for a flow control valve provided in a high-pressure fuel pump,
(a) driving the high-pressure fuel pump by rotating the cam provided on the camshaft when the engine is started,
(b) comparing the pressure of the fuel corresponding to the target RPM of the engine with the pressure of the fuel filled in the delivery pipe, and
(c) calculating an opening / closing time and an opening / closing time of the flow control valve based on a result of the comparison in the step (b); and
(d) controlling an opening and closing operation of the flow control valve based on the result calculated in the step (c)
Wherein the operation cycle of the flow control valve is a full-in time in which a current is supplied to the coil to close the flow control valve by moving a plunger provided in the solenoid to the core side by generating a magnetic field, and maintaining the flow control valve in a closed state And a drop time for opening the flow control valve by reducing the hold time and the current applied to the coil,
The step (d) includes the steps of: (d5) controlling the pull-in time to a first peak time for increasing the current to a preset hold current value, a first peak hold time for maintaining the current at the hold current value, A second peak time for increasing the current to a current value and a second peak hold time for maintaining the current at the peak current value, and a hold voltage set to a value lower than a peak voltage value preset to increase the current during the first peak time Generating a control signal of a value,
(d6) generating a control signal in the form of a PWM signal having a predetermined duty value during the first peak hold time,
(d7) generating a control signal of the peak voltage value during the second peak time, and
(d8) generating a control signal in the form of a PWM signal having a preset duty value during the second peak hold time,
The hold current value is set to a middle value of the peak current value
And controlling the current applied to the coil to lower the operating speed of the plunger during the pull-in time so as to attenuate noise and vibration due to the collision between the plunger and the core. . 12. The method of claim 11, wherein step (d)
(d9) generating a control signal having a duty value of '0' so as to lower the current to the hold current value during the zero duty time by dividing the hold time into a zero duty time and a holding time,
(d10) generating a control signal of a preset duty value to hold the hold current value during the holding time, and
(d11) generating a control signal to shut off the current applied to the coil during the drop time. A control method for a flow control valve provided in a high-pressure fuel pump,
(a) driving the high-pressure fuel pump by rotating the cam provided on the camshaft when the engine is started,
(b) comparing the pressure of the fuel corresponding to the target RPM of the engine with the pressure of the fuel filled in the delivery pipe, and
(c) calculating an opening / closing time and an opening / closing time of the flow control valve based on a result of the comparison in the step (b); and
(d) controlling an opening and closing operation of the flow control valve based on the result calculated in the step (c)
Wherein the operation cycle of the flow control valve is a full-in time in which a current is supplied to the coil to close the flow control valve by moving a plunger provided in the solenoid to the core side by generating a magnetic field, and maintaining the flow control valve in a closed state And a drop time for opening the flow control valve by reducing the hold time and the current applied to the coil,
The step (d) includes generating a control signal having a preset hold voltage value to increase the current to a predetermined hold current value during the peak time by dividing the pull-in time by a peak time and a peak hold time step,
(d13) generating a control signal in the form of a PWM control signal having a preset duty value during the peak hold time and the hold time, and
(d14) generating a control signal to interrupt the current applied to the coil during said drop time,
The hold current value is set to a middle value of a preset peak current value
And controlling the current applied to the coil to lower the operating speed of the plunger during the pull-in time so as to attenuate noise and vibration due to the collision between the plunger and the core. .

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