Fuel injection system comprising a variable flow rate high-pressure pump
First Claim
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1. A fuel injection system for an internal combustion engine, comprising:
- a variable flow rate high-pressure pump having at least one pumping element operable to perform intake and discharge strokes in a reciprocating manner, at an activation frequency that is based on engine revolutions speed, said pumping element having an intake valve in fluid communication with an intake line and a delivery valve in fluid communication with a delivery line;
a throttle device to control a flow rate of the pump including a metering solenoid valve positioned on said intake line to meter the quantity of fuel supplied to said pumping element; and
a control unit in electronic communication with said solenoid valve, the control unit programmed to calculate a number equal to a whole multiple or submultiple of the activation frequency of said pumping element that is multiplied by a factor other than 1, the factor being between 0.90 and 1.10, inclusive. the control unit transmitting a signal to operate said solenoid valve at a frequency equal to the calculated number, during the intake stroke of said pumping element.
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Abstract
An injection system includes a high-pressure pump with at least one pumping element operated in a reciprocating manner by corresponding intake and discharge strokes. Each pumping element is equipped with a corresponding intake valve in communication with an intake line, fed by a low-pressure pump. An on-off solenoid valve is positioned on the intake line of the pump and is controlled by a control unit with a frequency equal to a whole multiple or submultiple of that of the pumping action, multiplied by a factor different from 1 and/or between 0.90 and 1.10, inclusive.
20 Citations
14 Claims
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1. A fuel injection system for an internal combustion engine, comprising:
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a variable flow rate high-pressure pump having at least one pumping element operable to perform intake and discharge strokes in a reciprocating manner, at an activation frequency that is based on engine revolutions speed, said pumping element having an intake valve in fluid communication with an intake line and a delivery valve in fluid communication with a delivery line; a throttle device to control a flow rate of the pump including a metering solenoid valve positioned on said intake line to meter the quantity of fuel supplied to said pumping element; and a control unit in electronic communication with said solenoid valve, the control unit programmed to calculate a number equal to a whole multiple or submultiple of the activation frequency of said pumping element that is multiplied by a factor other than 1, the factor being between 0.90 and 1.10, inclusive. the control unit transmitting a signal to operate said solenoid valve at a frequency equal to the calculated number, during the intake stroke of said pumping element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A fuel injection system for an internal combustion engine, comprising:
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a variable flow rate high-pressure pump having at least one pumping element operated in a reciprocating manner including intake and discharge strokes, said pumping element having an intake valve in fluid communication with an intake line and a delivery valve in fluid communication with a delivery line; a throttle device operatively coupled to the pump to control a flow rate thereof, the throttle device including a metering solenoid valve positioned on said intake line to meter the quantity of fuel fed to said pumping element; and a control unit electrically coupled to said solenoid valve, the control unit configured to calculate a value equal to a whole multiple or submultiple of an activation frequency of said pumping element per a cycle of the engine multiplied by a factor other than one, the factor being between 0.90 and 1.10, inclusive. and to output a signal to control said solenoid valve, at a frequency equal to the calculated value per the cycle of the engine, during the intake phase of said pumping element.
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Specification