Abstract:
The present invention relates to a module for actuating fuel injectors and valves an internal combustion engine. The actuation module includes a housing having a high pressure rail and a low pressure rail. A plurality of actuation pistons are disposed in the housing and engage fuel injectors and intake/exhaust valves of the engine. One or more actuating valve assemblies control the flow of hydraulic fluid from the high pressure rail each of the actuation pistons.
Abstract:
In an injection system for an internal combustion engine, having one fuel pump per engine cylinder to be supplied of the engine, the pump being controlled electronically, having an injection nozzle that is provided with a nozzle needle, and having a connecting line between the fuel pump and the injection nozzle, it is an object for the injection course to be freely selectable. To this end, the injection nozzle is provided with an electronically controlled valve, which is capable of controlling the opening of the nozzle needle.
Abstract:
A fuel injection system with a fuel injection valve (15) and a control valve (50), which control valve (50) has a control valve member (54) that can move longitudinally in a control valve bore (52). The control valve member (54) is provided with a control valve sealing surface (55), which cooperates with a control valve seat (56) and thereby controls the connection between a first pressure chamber (57) and a second pressure chamber (58), where the first pressure chamber (57) is connected to a high-pressure accumulation chamber (10). A bore (30) is embodied in a valve body (25) and contains a piston-shaped valve needle (32) whose end oriented toward the combustion chamber controls the opening of at least one injection opening (38) by virtue of the fact that it executes a longitudinal movement due to the impingement of the pressure in a pressure chamber (31); the pressure chamber (31) is connected to the second pressure chamber (58) by means of a supply conduit (28). The first pressure chamber (57) is connected by means of a throttle (72) to a damping chamber (70) that is otherwise closed, as a result of which, pressure oscillations that are produced by the closing of the control valve (50) are rapidly damped (FIG. 1).
Abstract:
A method and system for injecting fuel in at least two different high fuel pressures via injectors into a combustion chamber of an internal combustion engine. The higher fuel pressure being stored in a central pressure reservoir, the lower fuel pressure is generated individually locally for each injector, at all times during the injection event by diversion of the higher fuel pressure. The diversion being activatable or deactivatable via a multi-way valve. To that end, a corresponding fuel injection system with a central pressure reservoir for storing the higher fuel pressure has a local diversion unit for each injector by means of which the lower fuel pressure can be generated dissipatively from the higher fuel pressure, and the local diversion unit has a multi-way valve for activating and deactivating the diversion, respectively. In this way, an improved metering of the lower fuel pressure can be achieved.
Abstract:
A high pressure fuel injection pump includes: a casing; a pump body arranged in the casing, the pump body having a piston and a sleeve reciprocating the piston therein; and a high pressure damper arranged in the casing and communicating with a discharge passage side of the pump body. The pump body and the high pressure damper are coaxially arranged in the casing.
Abstract:
A unitized fuel supply assembly is disclosed including an in-line reciprocating cam driven pump (14) for supplying fuel to an accumulator (12) from which fuel is directed to a plurality of engine cylinders by means of a distributor (16) mounted on the unitized assembly. Dual pump control valves (20) provide fail safe electronic control over the effective pump displacement. One or more injection control valves mounted on the distributor are provided to control injection timing and quantity. The accumulator (12) contains a labyrinth of interconnected chambers (36) which are shaped and positioned to produce a minimum overall package size while providing for easy manufacture.
Abstract:
A fuel system includes an electronically controllable high pressure fuel pump operable to supply high pressure fuel from a lower pressure fuel source to a high pressure fuel collection chamber having a pressure sensor associated therewith. The fuel collection chamber feeds an electronically controllable valve operable to dispense the high pressure fuel to a fuel distribution unit supplying fuel to a number of fuel injectors. A control computer is provided for controlling the high pressure fuel pump and valve in response to requested fueling, engine speed and fuel pressure provided by the pressure sensor. The control computer is normally operable to drive the fuel pump as a function of fuel pressure and a reference pressure, which is based on requested fueling, and to control the valve as a function of commanded fueling, which is a function of engine speed and a reference speed based on requested fueling, and fuel pressure. In a first limp home mode, the control computer is operable to drive the fuel pump as a function of fuel pressure and commanded fueling if abnormal operation of the high pressure fuel pump is detected. In this mode, the valve is controlled only as a function of fuel pressure. In a second limp home mode, the control computer is operable to drive the fuel pump with a predicted fuel pump command based on the fuel command and engine speed, if abnormal operation of the pressure sensor is detected. In this mode, the valve is controlled as a function of the fuel command and the reference pressure or a default pressure.
Abstract:
A priming system for a hydraulically actuated, electronically controlled unit injector fuel systems used on diesel engines and the like includes an accumulator charged at low pressure and in fluid communication with the manifold/rail passages leading to the individual fuel injectors, which passages are pressurized upon engine startup by the system's high pressure pump to actuate the injectors. The accumulator is plumbed into the hydraulic system by one way check valves which isolate the accumulator from the high pressure pump to permit the high pressure pump and the priming system to be located at any convenient position within the vehicle's engine compartment irrespective of their position relative to the manifold/rail passages.
Abstract:
A fuel primer pressure accumulator for an internal combustion engine fuel supply system capable of storing fuel under pressure when the internal combustion engine is stopped. The accumulator has a chamber formed by a casing and a pressure element. The accumulator is connected at a fuel inlet passage to the fuel supply line between the fuel pump and the carburetor. The accumulator is connected at a fuel outlet passage to a primer valve and through the primer valve to at least one fuel primer. A check valve is contained in the fuel inlet passage. The check valve permits the passage of fuel into the chamber when the internal combustion engine is running and restricts the passage of fuel out of the chamber when the internal combustion engine is stopped, thereby trapping fuel in the chamber.
Abstract:
A pressure storage (common rail) fuel injection system for an engine is provided, in which the fuel injection pressure rise response when quickly accelerating the engine is improved, engine output shortage is prevented, engine noise is reduced, and improvement is made with respect to soot generation and exhaust gas particulation. A booster is provided to boost pressurized fuel fed out from a pressure storage with a directional control valve for piston operation. Low pressure fuel injection in which fuel from the pressure storage is fed directly to fuel injection valve for injection, and high pressure fuel injection in which fuel having been boosted by the booster is fed to the fuel injection valve for injection, are switched one over to the other by a directional control valve for fuel injection control.