Pressurized fuel injection system for multi-cylinder engines, particularly diesel engines
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02M-041/02
F02M-039/00
출원번호
US-0445091
(1982-11-29)
우선권정보
DE-3148671 (1981-12-09)
발명자
/ 주소
Babitzka Rudolf (Kirschberg DEX)
출원인 / 주소
Robert Bosch GmbH (Stuttgart DEX 03)
인용정보
피인용 횟수 :
19인용 특허 :
5
초록▼
To provide for a compact and readily controlled injection system, so that initiation of fuel injection, and termination thereof can be electrically controlled, and independently of mechanical injection control pressure, and to provide for use of only a single connection line between a fuel supply (3
To provide for a compact and readily controlled injection system, so that initiation of fuel injection, and termination thereof can be electrically controlled, and independently of mechanical injection control pressure, and to provide for use of only a single connection line between a fuel supply (33-36; 32-41) and the respective injection valves (11-14), a piezo-electrically controlled control valve (38, 59) interposed between two each injection valves, which are, each operated by cams (2-5) to provide injection pressure. The injection valves (38, 39) permit communication, or blocking of the respective single lines (30, 31, 39, 40) from the fuel supply lines (32, 41), which will then function both as fuel supply, as well as overflow and drain lines. The cams (25) of paired valves are so arranged and offset that when one of the paired valves is commensing its injection stroke, the other one of the paired valves is moving into its OFF position. Actual injection time is controlled by a piezo-electric-hydraulic servo piston, of substantially larger diameter than the spool (45) of the spool valve injection control valve, to move the spool between communication line closing, or blocking, and communicating positions in accordance with electrical signals applied to the electrical positioning transducer. Thus, the cams mechanically control the longest possible injection stroke, the electrical signals permitting, however, selectively communication with the fuel supply system to provide, as required, selectively fuel supply to the injection valves, or otherflow therefrom when the spool of the valve establishes communication, whereas, when the spool blocks, fuel is being injected through the injection valve.
대표청구항▼
Pressurized fuel injection system for a multi-cylinder internal combustion engine, particularly multi-cylinder diesel engine fuel injection system having a plurality of injection valves (11-14) each injection valve having a valve piston (7-10) operable in a respective valve cylinder (24-27); timed m
Pressurized fuel injection system for a multi-cylinder internal combustion engine, particularly multi-cylinder diesel engine fuel injection system having a plurality of injection valves (11-14) each injection valve having a valve piston (7-10) operable in a respective valve cylinder (24-27); timed mechanical drive means (2-5) coupled (15-23) to a crank shaft (6) of the engine, and to the valve pistons for reciprocating the valve pistons; a fuel supply system (33-37) providing fuel from a tank (36); a connection line (30, 31; 33, 40; 32, 41) from the fuel supply system to the injection valves; and an electrically controlled control valve (38, 42) hydraulically connected into the connection lines between the fuel supply system and the injection valves, wherein, in accordance with the invention the control valve (38, 42) comprises a spool valve having a valve spool (45) moveable between first and second positions, respectively placing the connection lines (30, 31; 39, 40) of at least two injection valves (11, 12; 13, 14) either in open, hydraulically communicating, or closed, hydraulically blocking state; electrically controlled positioning control means (59, 63) moving said valve spool between the respective first and second positions; and wherein the mechanical drive means (2-5) are so coupled to the valve pistons of the at least two injection valves (11, 12; 13, 41) and are, respectively, so timed that during an injection pulse, only one of the valve pistons (7 or 8; 9 or 10) of the at least two injection valves (11, 12; 13, 14) is moved to provide for fuel injection therefrom, the electrically controlled piston control means (59, 63) controlling, respectively, blocking, and unblocking of hydraulic communication between the fuel supply system and the at least two valves, controlled by the electrically controlled positioning control means of the connecting lines to unblocked, or hydraulically communicating state permitting overflow of fuel from the respective valve through the respective communicating lines even during occurance of operation of the mechanical drive means to move the respective piston in a direction to expel fuel from the respective cylinder of the respective valve.
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이 특허에 인용된 특허 (5)
Babitzka Rudolf (Kirchberg DEX) Linder Ernst (Mhlacker DEX), Electrically controlled mechanical positioning device.
Leblanc Jean (Lyons FRX) Pigeroulet Jean (Villeurbanne FRX) Straubel Max (Stuttgart DEX), Fuel injection apparatus for internal combustion engines, in particular for diesel engines.
Leblanc Jean (Lyons FRX) Pigeroulet Jean (Villeurbanne FRX) Straubel Max (Stuttgart DEX) Eckert Konrad (Stuttgart DEX), Fuel injection apparatus for internal combustion engines, in particular for diesel engines.
Tissot Raymond (Genas FRX) Leblanc Jean (Lyons FRX) Pigeroulet Jean (Villeurbanne FRX), Fuel injection apparatus for internal combustion engines, in particular for diesel engines.
Moler, Jeff; Oudshoorn, Mark; Akhavein, R. Glenn; Woozley, Mark; Alexy, Michael, Apparatus having a pair of opposing surfaces driven by a piezoelectric actuator.
Moler, Jeff; Oudshoorn, Mark; Akhavein, R. Glenn; Woozley, Mark; Alexy, Michael, Apparatus having a pair of opposing surfaces driven by a piezoelectric actuator.
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