FUEL INJECTION SYSTEM COMPRISING A VARIABLE FLOW RATE HIGH-PRESSURE PUMP
First Claim
1. A fuel injection system for an internal combustion engine, comprisinga variable flow rate high-pressure pump having at least one pumping element operated in a reciprocating manner by means of 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 (8);
- 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 fed to said pumping element; and
a control unit able to control said solenoid valve during the intake phase of said pumping element based on operating conditions of the engine, said control unit operating said solenoid valve with a frequency equal to a whole multiple or submultiple of the activation frequency of said pumping element multiplied by a factor other than 1.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
16 Claims
-
1. A fuel injection system for an internal combustion engine, comprising
a variable flow rate high-pressure pump having at least one pumping element operated in a reciprocating manner by means of 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 (8); -
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 fed to said pumping element; and a control unit able to control said solenoid valve during the intake phase of said pumping element based on operating conditions of the engine, said control unit operating said solenoid valve with a frequency equal to a whole multiple or submultiple of the activation frequency of said pumping element multiplied by a factor other than 1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A fuel injection system for an internal combustion engine, comprising:
-
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 configured to control said solenoid valve during the intake phase of said pumping element based on operating conditions of the engine, said control unit operating said solenoid valve with a frequency equal to a whole multiple or submultiple of the activation frequency of said pumping element multiplied by a factor between 0.90 and 1.10, inclusive.
-
Specification