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 control unit 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 the plunger and a core by adjusting an operation speed of a plunger provided in a solenoid upon opening/closing operation of the flow control valve provided in the high-pressure fuel pump based on a target RPM of an engine received from a main control unit of a vehicle and a sensing signal of the pressure sensor;
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 to or disconnected from the flow control valve by an operation of 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.
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
9 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 control unit 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 the plunger and a core by adjusting an operation speed of a plunger provided in a solenoid upon opening/closing operation of the flow control valve provided in the high-pressure fuel pump based on a target RPM of an engine received from a main control unit of a vehicle and a sensing signal of the pressure sensor; 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 to or disconnected from the flow control valve by an operation of 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. - 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, wherein, during a pull-in time of an opening/closing operation cycle of the flow control valve provided in the high-pressure fuel pump, in which a current is supplied 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, a current supplied to the flow control valve is reduced by using a current adjustment unit connected to a rear end of the flow control valve, thereby preventing a noise and a vibration caused by collision between the plunger and a core.
Specification