Apparatus and method for controlling flow control valve for high pressure fuel pump
First Claim
1. An apparatus for controlling a flow control valve for a high-pressure fuel pump, the apparatus comprising:
- a pressure sensor for sensing pressure of fuel filled in a delivery pipe;
a controller for controlling an operation of a flow control valve by controlling a current applied to a coil to attenuate a noise and a vibration caused by collision between a plunger and a core by adjusting an operation speed of the plunger provided in a solenoid upon opening/closing the operation of the flow control valve provided in the high-pressure fuel pump based on a target revolutions per minute (RPM) of an engine received from a main controller of a vehicle and a sensing signal of the pressure sensor;
a power switch for supplying or blocking driving power supplied to the flow control valve based on a control signal of the controller; and
a current adjustment part electrically connected to or disconnected from the flow control valve by an operation of the power switch to reduce a current supplied to the flow control valve when the current adjustment part is connected with the flow control valve,wherein the power switch comprises;
a first switch installed on a power supply line for applying the driving power to the flow control valve from a battery of the vehicle;
a second switch installed between the first switch and a ground potential line; and
a third switch installed between the flow control valve and the ground potential line.
1 Assignment
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Accused Products
Abstract
An apparatus and a method for controlling a flow control valve for a high-pressure fuel pump include: a pressure sensor for fuel in a delivery pipe; a control unit for controlling an operation of a flow control valve by controlling a current applied to a coil; a power switching unit for supplying or blocking driving power supplied to the flow control valve based on a control signal of the control unit; and a current adjustment unit electrically connected/disconnected with the flow control valve by the power switching unit to reduce a current supplied to the flow control valve when the current adjustment unit is connected with the flow control valve. Therefore, a noise and a vibration by collision between the plunger and the core upon closing the flow control valve may be attenuated by adjusting a current amount applied to the coil.
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Citations
8 Claims
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1. An apparatus for controlling a flow control valve for a high-pressure fuel pump, the apparatus comprising:
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a pressure sensor for sensing pressure of fuel filled in a delivery pipe; a controller for controlling an operation of a flow control valve by controlling a current applied to a coil to attenuate a noise and a vibration caused by collision between a plunger and a core by adjusting an operation speed of the plunger provided in a solenoid upon opening/closing the operation of the flow control valve provided in the high-pressure fuel pump based on a target revolutions per minute (RPM) of an engine received from a main controller of a vehicle and a sensing signal of the pressure sensor; a power switch for supplying or blocking driving power supplied to the flow control valve based on a control signal of the controller; and a current adjustment part electrically connected to or disconnected from the flow control valve by an operation of the power switch to reduce a current supplied to the flow control valve when the current adjustment part is connected with the flow control valve, wherein the power switch comprises; a first switch installed on a power supply line for applying the driving power to the flow control valve from a battery of the vehicle; a second switch installed between the first switch and a ground potential line; and a third switch installed between the flow control valve and the ground potential line. - View Dependent Claims (2, 3, 4, 5)
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6. A method of controlling a flow control valve for a high-pressure fuel pump, the method comprising:
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supplying a current to a coil to generate a magnetic field so as to move a plunger provided in a solenoid toward a core to close the flow control valve, during a pull-in time of an opening/closing operation cycle of the flow control valve provided in the high-pressure fuel pump; and reducing the current supplied to the flow control valve by using a current adjustment part connected to a rear end of the flow control valve, thereby preventing a noise and a vibration caused by collision between the plunger and the core, wherein the method further comprises; (a) turning on a first switch installed on a power supply line for applying driving power to the flow control valve from a battery of a vehicle at a starting point of the pull-in time; (b) turning off a second switch installed between the first switch and a ground potential line; and (c) turning off a third switch to remove suction force applied to the plunger when reaching a first preset-time after simultaneously turning on the first switch and the third switch which is installed between the flow control valve and the ground potential line. - View Dependent Claims (7, 8)
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Specification