Fuel injection system comprising a high-pressure variable-delivery pump
AssigneeC.R.F. Societa Consortile per Azioni
InventorsMario Ricco, Sisto De Matthaeis, Onofrio De Michele, Annunziata Satriano
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Abstract
The injection system has a high-pressure pump (7) having at least one pumping element (18) operated reciprocatingly to perform an intake stroke and a delivery stroke. Each pumping element (18) has a corresponding intake valve (25) communicating with an intake conduit (10) supplied by a low-pressure pump (9). The intake conduit (10) is fitted with an on-off solenoid valve (27) controlled by a control unit (16) asynchronously with respect to the intake of each pumping element (18). And the control unit (16) may control the on-off solenoid valve (27) by means of frequency-modulated and/or duty-cycle-modulated control signals (A, C).
Claims15
A fuel injection system of an internal combustion engine, comprising a variable-delivery high-pressure pump having at least one pumping element (18) operating reciprocatingly to perform an intake stroke and a delivery stroke;
- said pumping element (18) having an intake valve (25) communicating with an intake conduit (10), and a delivery valve (30) communicating with a delivery conduit (8);
- and comprising a regulating device (31) for regulating the delivery of said pump (7) and the quantity of fuel supplied to said pumping element (18);
- said regulating device (31) being located along said intake conduit (10);
- characterized in that said regulating device (31) comprises an on-off solenoid valve (27);
- a control unit (16) controlling said on-off solenoid valve (27) asynchronously with respect to said intake stroke.
Dependencies are inferred from the claim text.