초록 ▼

The injection system comprises a pump designed to send fuel at high pressure to an accumulation volume, for example formed by a common rail, for supplying a plurality of injectors. The pump comprises at least one pumping element actuated with reciprocating motion with a compression stroke at a sinus

The injection system comprises a pump designed to send fuel at high pressure to an accumulation volume, for example formed by a common rail, for supplying a plurality of injectors. The pump comprises at least one pumping element actuated with reciprocating motion with a compression stroke at a sinusoidal speed, in synchronism with each step of fuel injection. The injection system comprises at least one by-pass solenoid valve, which is controlled by a chopper control unit for modulating the delivery of the pumping element by varying both the instant of start and the instant of end of delivery during the compression stroke, in such a way that the delivery is synchronous with the injection phase.

대표청구항 ▼

We claim: 1. A fuel injection system for an engine, the engine including at least one engine cylinder and operating at a variable engine speed, the fueling system comprising:a fuel pump for supplying fuel at high pressure, the fuel pump including at least one pumping element and operating at a speed

We claim: 1. A fuel injection system for an engine, the engine including at least one engine cylinder and operating at a variable engine speed, the fueling system comprising:a fuel pump for supplying fuel at high pressure, the fuel pump including at least one pumping element and operating at a speed that is proportional to the variable engine speed, the at least one pumping element including a compression phase having an instant of start Pi and an instant of end Ps;an accumulation volume in communication with the fuel pump and receiving fuel at high pressure therefrom;a by-pass valve in communication with the fuel pump and the accumulation volume, the by-pass valve operating to intermittently deliver fuel at high pressure from the fuel pump to the accumulation volume, the by-pass valve operating to deliver fuel to the accumulation volume during only a portion of the compression phase such that a fuel delivery instant of start T0 occurs after the compression phase instant of start Pi and a fuel delivery instant of end T1 occurs before the compression phase instant of end Ps; andat least one fuel injector in communication with the accumulation volume and receiving fuel at high pressure therefrom, the at least one fuel injector actuatable independently of the by-pass valve to inject fuel into the engine cylinder during an injection phase that occurs within the compression phase.