Multicylinder petrol engine with variable actuation of the valves
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02B-015/00
F01L-001/34
출원번호
US-0783298
(2007-04-06)
등록번호
US-RE43486
(2012-06-26)
우선권정보
IT-TO2001A1187 (2001-12-18)
발명자
/ 주소
Doria, Vittorio
Lucatello, Marco
출원인 / 주소
C.R.F. Societa Consortile per Azioni
대리인 / 주소
Nixon & Vanderhye P.C.
인용정보
피인용 횟수 :
1인용 특허 :
7
초록▼
A multicylinder petrol engine is provided with a hydraulic system for variable actuation of the valves, which enables easy control of operation of the engine according to different strategies. The engines according to the invention is, in particular, able to operate with a variable engine displaceme
A multicylinder petrol engine is provided with a hydraulic system for variable actuation of the valves, which enables easy control of operation of the engine according to different strategies. The engines according to the invention is, in particular, able to operate with a variable engine displacement in a modular way via the exclusion of selected cylinders, to control combustion by adjustment of the effective compression ration, and to control re-circulation of the exhaust gases at intake, in order to achieve low levels of consumption and reduced harmful exhaust emissions.
대표청구항▼
1. A multicylinder petrol engine, comprising: at least one intake valve and at least one exhaust valve for each cylinder, each valve being provided with respective elastic return means, which push the valve towards a closed position for controlling respective intake and exhaust pipes; andat least on
1. A multicylinder petrol engine, comprising: at least one intake valve and at least one exhaust valve for each cylinder, each valve being provided with respective elastic return means, which push the valve towards a closed position for controlling respective intake and exhaust pipes; andat least one camshaft, for actuating the intake valves and exhaust valves of the engine cylinders by means of respective tappets;in which each intake valve is controlled by the respective tappet against the action of the elastic return means by interposition of hydraulic means that include a pressurized fluid chamber;said pressurized fluid chamber being designed to be connected by means of a solenoid valve to an exhaust channel in order to uncouple the valve from the respective tappet and bring about fast closing of the valve as a result of the respective elastic return means;electronic control means for controlling each solenoid valve so as to vary the time and the stroke of opening of the respective intake valve according to one or more operating parameters of the engine;wherein said engine comprises second electronic control means for keeping the exhaust valves of pre-set engine cylinders closed, and in that said electronic control means are pre-arranged for keeping the intake valves of selected cylinders of the engine closed, simultaneously with the activation of the means for keeping the exhaust valves closed, so as to inhibit operation of said selected cylinders. 2. The engine according to claim 1, wherein said engine has an even number of cylinders and in that said electronic control means are pre-arranged for deactivating one half of the engine cylinders. 3. The engine according to claim 1, wherein said engine has an odd number of cylinders and said electronic control means are pre-arranged for deactivating, by turns, all the cylinders of the engine in such a way as to maintain the uniformity of staggering between the individual combustion phases. 4. The engine according to claim 1, wherein said electronic control means are pre-arranged for adjusting the effective compression ratio of the engine by anticipating closing of the intake valve prior to bottom dead centre and by retarding closing of the intake valve to exceed the angel of maximum volumetric efficiency of the engine. 5. The engine according to claim 1, wherein the cam of the camshaft of the engine, which controls each intake valve, has a profile such as to tend to bring about opening of said intake valve not only during the conventional opening phase within the normal operating cycle of the engine, but also in at least one additional phase of the cycle, and in that said electronic control means are pre-arranged for enabling said second opening of the intake valve during the exhausts phase, so as to obtain an induction into the combustion chamber of the hot gases that have flowed into the intake pipe during the subsequent induction phase. 6. A multicylinder petrol engine that can use gasoline or diesel fuel, comprising: at least one intake valve and at least one exhaust valve for each cylinder, each valve being provided with respective elastic return means, which push the valve towards a closed position for controlling respective intake and exhaust pipes;at least one camshaft, for actuating the intake valves and exhaust valves of the engine cylinders by means of respective tappets;wherein each intake valve is controlled by the respective tappet against the action of the aforesaid elastic return means by interposition of hydraulic means that include a pressurized fluid chamber;said pressurized fluid chamber being designed to be connected by means of a solenoid valve to an exhaust channel in order to uncouple the valve from the respective tappet and bring about fast closing of the valve as a result of the respective elastic return means;electronic control means for controlling each solenoid valve so as to vary the time and the stroke of opening of the respective intake valve according to one or more operating parameters of the engine;said engine comprises electronic control means in pre-arranged fashion for adjusting the effective compression ratio of the engine by anticipating closing of the intake valve prior to bottom dead centre or by retarding closing of the intake valve to exceed the angle of maximum volumetric efficiency of the engine;said electronic control means being adapted for a second control function for adjusting the effective compression ratio in order to control combustion;wherein said engine comprises second electronic control means for keeping the exhaust valves of pre-set engine cylinders closed, and in that said electronic control means are pre-arranged for keeping the intake valves of selected cylinders of the engine closed, simultaneously with the activation of the means for keeping the exhaust valves closed, so as to inhibit operation of said selected cylinders. 7. The engine according to claim 6, wherein said engine has at least two intake valves for each cylinder, and in that said electronic control means are pre-arranged such that each intake valve may undergo three adjustments: (1) retarded opening, (2) anticipated closing, and (3) retarded opening plus anticipated closing, so that the aforesaid three possible basic adjustments can be combined together in various flexible ways, giving rise to different modes of valve management which are chosen according to the desired adjustments in terms of pumping, turbulence inside the combustion chamber, and motions inside the combustion chamber. 8. The engine according to claim 7, wherein said electronic control means are pre-arranged for carrying out one or more of the following strategies of control of the intake valves of each cylinder: anticipated closing of both intake valves with the same valve lifts; anticipated closing of the intake valves with different valve lifts; alternate anticipated closing of the intake valves, opening just one valve per engine cycle alternately; retarded opening of both intake valves with the same valve lifts; retarded opening of the intake valves with different valve lifts; alternate retarded opening of the intake valves, opening just one valve per engine cycle alternately; retarded opening of one valve and anticipated closing of the other valve; retarded opening and anticipated closing on each of the two valves with the same valve lifts; retarded opening and anticipated closing on each of the two valves with different valve lifts; and retarded opening/anticipated closing on each valve, opening, however, just one valve per engine cycle alternately. 9. The engine according to claim 6, wherein said engine comprises second electronic control means for keeping the exhaust valves of pre-set engine cylinders closed, and in that said electronic control means are pre-arranged for keeping the intake valves of selected cylinders of the engine closed, simultaneously with the activation of the aforesaid means for keeping the exhaust valves closed, so as to inhibit operation of said selected cylinders. 10. The engine according to claim 9, wherein said engine has an even number of cylinders and in that said electronic control means are pre-arranged for deactivating one half of the engine cylinders. 11. The engine according to claim 9, wherein said engine has an odd number of cylinders and in that said electronic control means are pre-arranged for deactivating, by turns, all the cylinders of the engine in such a way as to maintain the uniformity of staggering between the individual combustion phases, thus obtaining an eight-stroke operating cycle. 12. The engine according to claim 9, wherein the cam of the camshaft of the engine, which controls each intake valve, has a profile such as to tend to bring about opening of said intake valve not only during the conventional opening phase within the normal operating cycle of the engine, but also in at least one additional phase of the cycle, and in that said electronic control means are pre-arranged for enabling said second opening of the intake valve during the exhaust phase, so as to obtain an induction into the combustion chamber of the hot gases that have flowed into the intake pipe during the subsequent induction phase in order to obtain an internal EGR.
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이 특허에 인용된 특허 (7)
Nimura, Hiroyoshi; Takemoto, Yoshiharu; Kasahara, Koji; Yamamoto, Toshiaki; Takemoto, Takashi; Hashimoto, Kazunari, Compound electromagnetic valve, high pressure pump and apparatus for controlling high pressure pump.
Lucatello, Marco; Borean, Fabio, Internal combustion engine with cylinders that can be de-activated, with exhaust gas recirculation by variable control of the intake valves, and method for controlling an internal combustion engine.
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