Fuel-injection system for an internal-combustion engine
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02M-063/00
F02M-037/04
출원번호
US-0617629
(2006-12-28)
등록번호
US-7395812
(2008-07-08)
우선권정보
EP-06425394(2006-06-09)
발명자
/ 주소
Ricco,Mario
Gorgoglione,Adriano
Ricco,Raffaele
Stucchi,Sergio
출원인 / 주소
C.R.F. Societa Consortile per Azioni
대리인 / 주소
Ostrolenk, Faber, Gerb & Soffen, LLP
인용정보
피인용 횟수 :
2인용 특허 :
25
초록▼
The injection system comprises a high-pressure pump (7) with variable flowrate, having a number of pumping elements (18) actuated with reciprocating motion and provided each with a corresponding intake valve (22). An accumulation volume (28) is supplied with fuel at low pressure from an intake pipe
The injection system comprises a high-pressure pump (7) with variable flowrate, having a number of pumping elements (18) actuated with reciprocating motion and provided each with a corresponding intake valve (22). An accumulation volume (28) is supplied with fuel at low pressure from an intake pipe (10) of the pump (7) through a solenoid valve (31) controlled as a function of the operating conditions of the engine (2). The accumulation volume (28) is in communication with the intake valves (22) through corresponding outlet holes (29), and the solenoid valve (31) is provided with nebulizer holes (36) such as to generate corresponding jets of fuel, each directed towards at least one of said outlet holes (29).
대표청구항▼
The invention claimed is: 1. A fuel-injection system for an internal-combustion engine, comprising a high-pressure pump (7) with variable flowrate, having a number of pumping elements (18) actuated with reciprocating motion through intake and delivery strokes, each of said pumping elements (18) bei
The invention claimed is: 1. A fuel-injection system for an internal-combustion engine, comprising a high-pressure pump (7) with variable flowrate, having a number of pumping elements (18) actuated with reciprocating motion through intake and delivery strokes, each of said pumping elements (18) being provided with a corresponding intake valve (22); said system being characterized in that a volume for accumulation (28) of fuel at low pressure is supplied by an intake pipe (10) of said pump (7) through a solenoid valve (31), said accumulation volume (28) being in communication with said intake valves (22) through corresponding outlet holes (29), said solenoid valve (31) being such as to generate corresponding jets of fuel, each directed towards at least one of said outlet holes (29). 2. The injection system according to claim 1, characterized in that each of said jets of fuel is generated by a corresponding nebulizer hole (36) of said solenoid valve (31). 3. The injection system according to claim 1, characterized in that said solenoid valve (31) is constituted by an electromagnetic-control injector (32) for injection of fuel at low pressure. 4. The injection system according to claim 2, in which said pump (7) is provided with a number of pumping elements (18) set in line, said system being characterized in that said solenoid valve (31) has an equal number of nebulizer holes (36) for generating said jets, each jet being directed towards the corresponding outlet hole (29) of said accumulation volume (28). 5. The injection system according to claim 4, in which said pump (7) is provided with two pumping elements (18, 18a), said system being characterized in that said solenoid valve (31) has two nebulizer holes (36), said accumulation volume (28) being set between said pumping elements (18) and having two outlet holes (29), said intake valves (22) and said outlet holes (29) being arranged in positions specular to one another. 6. The injection system according to claim 5, characterized in that the nebulizer holes (36) of said solenoid valve (36) and said outlet holes (29) are arranged in such a way that said jets form an angle smaller than 180�� with respect to one another. 7. The injection system according to claim 5, characterized in that said intake valves (22) and said outlet holes (36) are substantially coaxial, said jets being directed at 180�� with respect to one another. 8. The injection system according to claim 4, in which said pump (7) is provided with three pumping elements (18) arranged in a star configuration and actuated by a common eccentric cam, said system being characterized in that said accumulation volume (28) is substantially coaxial with the usual rotation axis of said eccentric cam and is in communication with the intake valves of said pumping elements through corresponding pipes. 9. The injection system according to claim 8, characterized in that the nebulizer holes (36) of said solenoid valve (31) and said outlet holes (29) are arranged in such a way that said jets form an angle smaller than 120�� with respect to one another. 10. The injection system according to claim 4, in which said pump (7) is provided with four pumping elements (18), said system being characterized in that said solenoid valve (31) is provided with four nebulizer holes (36) and said accumulation volume (28) is provided with four corresponding outlet holes (29), said nebulizer holes (36) and said outlet holes (29) being arranged in such a way that said jets are directed each towards the corresponding outlet holes (29). 11. The injection system according to claim 4, in which said pump (7) is provided with four pumping elements (18) divided into two sets each formed by two pumping elements (18), said system being characterized in that, for each pumping element (18), said accumulation volume (28) is provided with a corresponding outlet hole (29), said solenoid valve (31) being provided with a nebulizer hole (36) for each of said sets of pumping elements (18), said nebulizer holes (36) being arranged so as to generate each a corresponding jet of fuel directed towards the outlet holes (29) of said accumulation volume (28) of the corresponding set of pumping elements (18). 12. The injection system according to any one of the preceding claims, characterized in that said solenoid valve (31) is controlled asynchronously with respect to said intake strokes as a function of the operating conditions of the engine by a control unit (14), by means of control signals (A, C) modulated in frequency and/or in duty-cycle as a function of the operating conditions of the engine (2). 13. The injection system according to claim 12, characterized in that said control unit (14) is designed to control said solenoid valve (31) by means of control signals having a frequency correlated to the speed of rotation of said pump and/or having a variable duty-cycle. 14. The injection system according to claim 13, characterized in that said control unit (14) is designed to control said solenoid valve (31) by means of control signals (A) of constant duration, said control signals (A) being emitted with variable frequency. 15. The injection system according to claim 14, characterized in that said frequency is lower than the maximum frequency of the intake strokes of said pump (7). 16. The injection system according to claim 12, characterized in that the maximum instantaneous flowrate of fuel through said solenoid valve (31) can be up to 20% more than the maximum instantaneous flowrate of fuel taken in through each of said intake valves (22). 17. The injection system according to claim 16, characterized in that the outlet section of said solenoid valve (31) is such as to deliver a flowrate higher than the mean flowrate of fuel taken in through said intake valves (22). 18. The injection system according to claim 12, characterized in that the duration of each control signal (A, C) is of the order of one thousandth of a second and/or said duty-cycle varies from 2% to 95%.
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이 특허에 인용된 특허 (25)
Kuroda, Akihiro, Common rail type fuel injection system.
Nicola Pacucci IT; Sisto Luigi De Matthaeis IT, Device for regulating the delivery pressure of a pump, for example, for feeding fuel to an internal combustion engine.
Ricco,Mario; De Matthaeis,Sisto Luigi; Ricco,Raffaele; De Michele,Onofrio, High-pressure pump with a device for regulating the flow rate for a fuel-injection system.
Ricco, Mario; De Matthaeis, Sisto Luigi; Ricco, Raffaele; Lepore, Domenico, Accumulation-volume fuel injection system for an internal-combustion engine.
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