Abstract: The present invention provides an improved oil injection lubrication system for two-cycle engines. The system includes a variable output oil pump, the output of which can be varied in relation to the throttle level. The system also includes a solenoid valve unit containing a plurality of solenoid valves that regulate the flow of oil from the oil pump to each cylinder. The electronic control unit sends control signals to the solenoid valve unit to regulate the flow of oil based upon factors relating to the operation of the engine in accordance with a control scheme. The factors may include those that apply to all of the engine's cylinders (i.e., do not vary between the cylinders), such as intake air temperature, atmospheric pressure, battery voltage, engine break-in period, and load frequency among others.

Abstract: Cooling arrangements that cool down fuel injectors exposed to the high temperature combustion in direct injected engines so that no heavy oil components deposit on nozzles of the fuel injectors. A bypass of water flow extends in the proximity of the boss where the fuel injector is inserted to expedite cooling of the fuel injector. A cavity extending toward the boss can replace the bypass or can be additionally provided. The fuel injector boss and a spark plug boss are connected with each other and make a wall that can obstruct water flow. Another bypass is provided to clear water away from a backwater formed at the wall. In case that some heavy oil components deposit on the injector nozzles for some reasons, a control system for controlling the fuel injection is allowed to adjust amounts of the fuel basically in response to the temperature of the injector nozzle.

Abstract: A fuel system for an outboard motor includes a plurality of high-pressure pumps and a conduit circuit with a multi-branched passage connecting the engine's combustion chamber(s) to the fuel supply. At least two sections of the conduit circuit may be connected together at a point downstream of the high-pressure pumps. The high-pressure pumps also may be driven by a common pump drive unit, which may be designed to drive the pumps in a manner providing a generally uniform flow of fuel.

Abstract: The invention provides an improved oil injection lubrication system for two-cycle engines. The system includes a variable output oil pump, the output of which can be varied in relation to the throttle level. The system also includes a solenoid valve unit containing a plurality of solenoid valves that further regulates the flow of oil from the oil pump to each cylinder. An electronic control unit sends control signals to the soleniod valve unit to regulate the flow of oil based upon engine operating conditions in accordance with a controle scheme. The combination of the variable output oil pump and the solenoid valve unit enables the solenoid valves to be activated with a lighter duty cycle, which reduces the amount of power consumed by the solenoid valve unit.

Abstract: A prefilled syringe has a tubular body which has an open front end and an open rear end. A front assembly is mounted on an outer periphery of a front end portion of the tubular body. A finger grip is mounted on an outer periphery of a rear end portion of the tubular body. A front sealing member is provided in the tubular body so as to be disposed forwardly of injection liquid and a rear sealing member is provided in the tubular body so as to be disposed rearwards of the injection liquid. A plunger rod is provided so as to be movable in the tubular body. A temporary stop member temporarily stops the plunger rod through retention of the temporary stop member by the finger grip such that the rear sealing member is temporarily stopped at a predetermined position of the tubular body. A retention canceling member cancels the retention of the temporary stop member by the finger grip without moving the plunger rod.

Abstract: A feed back control system and method for direct injected engines useful in a start up operation that utilizes a fuel pressure condition sensor. At the commencement of cranking, the feed back control system adjusts at least the initiation of fuel injection based upon the output from the fuel pressure condition sensor. This removes a great shift in the fuel pressure between before and after starting of the engine and eventually promotes operator's feeling and also improves exhaust emissions.

Abstract: A fuel supply system is disclosed for a direct injected “V” type engine powering an outboard motor. The fuel supply system includes a pump for supplying fuel from a tank to a vapor separator. An electrical pump delivers fuel from the vapor separator to a mechanical high pressure pump, which delivers fuel under high pressure to a fuel manifold and further to a pair of fuel rails. The fuel rails supply fuel to fuel injectors for delivering fuel to the combustion chambers of the engine. Recesses are formed on a side of each cylinder head and one fuel rail is positioned within each recess. The mechanical high pressure pump is positioned vertically above the uppermost fuel injector so that any fuel vapor within the fuel rails will rise toward the fuel pump. Fuel vapor that accumulates within the high pressure fuel pump is returned to the vapor separator.

Abstract: A control system for a multicylinder direct injection engine determines a control variable for each cylinder based on engine speed and engine load. The control variable can be altered depending upon an operating temperature of each cylinder independently of the others. The operating temperature of each cylinder is monitored through a temperature sensor disposed on the fuel injector nozzle. The cylinders having nozzles operating at a temperature lower than a normal temperature or normal range of temperatures can have the control variable altered to increase the power of that cylinder and the temperature of that cylinder. The cylinders having nozzles operating at a temperature higher than a normal temperature or normal range of temperatures can have the control variable altered to lower the operating temperature of the nozzle.

Abstract: An exhaust catalyst assembly for an outboard motor includes a branched passage connecting the main exhaust passages with a catalyst device. The outboard motor can include various exhaust passages and features for controlling and discharging the flow to and from the catalyst device.

Abstract: A feed back control system and method for direct injected engines useful in a start up operation that utilizes a fuel pressure condition sensor. At the commencement of cranking, the feed back control system adjusts at least the initiation of fuel injection based upon the output from the fuel pressure condition sensor. This removes a great shift in the fuel pressure between before and after starting of the engine and eventually promotes operator's feeling and also improves exhaust emissions.

Abstract: Several embodiments of combustion chamber configurations for direct injected engines having a substantial recess in the cylinder head in which the fuel injector is positioned and injects. The injector is arranged so as to be disposed over the exhaust port and to spray toward the auxiliary scavenge port. However, the spray pattern is such that fuel will not impinge upon the cylinder head surface and so that the scavenge flow will direct the fuel away from the cylinder walls and toward the head of the piston for cooling and better vaporization. This also ensures that fuel will not pass out of the exhaust port.

Abstract: A control device and method of injected fuel for a direct cylinder injected, internal combustion engine. The control device primarily increases the fuel amount to a certain amount under the conditions that the engine load is increasing such as an acceleration condition. The device, however, when a quick change of the load increase occurs, reduces the increase amount of the fuel at the first combustion cycle or cycles. Although there may be other controls, the device then gradually increases the fuel amount to the amount until the primary amount at intervals of at least one combustion cycle. The quick change of the load increase is, in one aspect of the invention, defined as that a crankshaft rotational speed is within a predetermined range and the throttle valve opening is larger than a predetermined value.

Abstract: A diagnostic system is provided to aid a technician or engineer in diagnosing an internal combustion engine. The diagnostic system comprises an electronic control unit that is operatively coupled to a data storage device and to one or more engine sensors. The electronic control unit is configured to collect data from the one or more engine sensors and to store that data in the data storage device. A computer is selectively coupled to the data storage device. The computer program is configured to display specific sets of data stored in the data storage device in various formats.

Abstract: An improved fuel supply arrangement for a direct fuel injected engine. In one feature, the fuel supply arrangement comprises a high pressure fuel pump for developing high pressure in fuel, a fuel injector for directly injecting the fuel into combustion chamber of the engine and a flexible conduit for connecting the high pressure fuel pump and the fuel injector. In another feature that is for a multi-cylinder engine, the fuel supply arrangement comprises a high pressure fuel pump for developing high pressure in fuel, a plurality of fuel injectors for directly injecting the fuel into respective combustion chambers of the engine, a fuel supply rail for supplying the fuel from the high pressure fuel pump to the fuel injectors and a flexible conduit for connecting the high pressure fuel pump and the fuel supply rail.

Abstract: A fuel supply system is disclosed for a direct injected “V” type engine powering an outboard motor. The fuel supply system includes a pump for supplying fuel from a tank to a vapor separator. An electrical pump delivers fuel from the vapor separator to a mechanical high pressure pump, which delivers fuel under high pressure to a fuel manifold and further to a pair of fuel rails. The fuel rails supply fuel to fuel injectors for delivering fuel to the combustion chambers of the engine. Recesses are formed on a side of each cylinder head and one fuel rail is positioned within each recess. The mechanical high pressure pump is positioned vertically above the uppermost fuel injector so that any fuel vapor within the fuel rails will rise toward the fuel pump. Fuel vapor that accumulates within the high pressure fuel pump is returned to the vapor separator.

Abstract: An engine fuel injection system including a supply arrangement that includes a pair of conduits for supplying fuel to the plural injectors. The conduits are interrelated with the injectors in such a way that no one conduit supplies fuel to any two fuel injectors that fire simultaneously with or in sequence with each other.

Abstract: A fuel supply system is disclosed for a direct injected “V” type engine powering an outboard motor. The fuel supply system includes a pump for supplying fuel from a tank to a vapor separator. An electrical pump delivers fuel from the vapor separator to a mechanical high pressure pump, which delivers fuel under high pressure to a fuel manifold and further to a pair of fuel rails. The fuel rails supply fuel to fuel injectors for delivering fuel to the combustion chambers of the engine. Recesses are formed on a side of each cylinder head and one fuel rail is positioned within each recess. The mechanical high pressure pump is positioned vertically above the uppermost fuel injector so that any fuel vapor within the fuel rails will rise toward the fuel pump. Fuel vapor that accumulates within the high pressure fuel pump is returned to the vapor separator.

Abstract: An direct injected internal combustion engine includes a catalytic device for cleaning the exhaust gases of the engine. A control system of the engine is configured to adjust at least one of fuel injection timing, fuel injection duration and ignition timing so as to increase the temperature of the exhaust gases entering the catalytic device.

Abstract: A number of embodiments of direct injected V-type outboard motors provided with a very effective fuel supply system wherein the number of components can be significantly reduced as well as the elimination of many of the flexible conduits normally employed. This also permits the fuel system to be assembled as a relatively unitary assembly that can be then affixed to the engine. The arrangement is such that purging of the system from vapors during shutdowns is easily accomplished and the system can be purged without complicated construction. Furthermore, the system can be pressure tested by an arrangement where the low pressure system can bypass the high pressure system when the engine is not operating so as to be pressurized for testing purposes. However, when the high pressure system operates, then the bypass line will be closed by the shunting valve arrangement.

Abstract: A fuel injector mounting construction for an engine includes an improved thrust member. The engine is a direct injected, internal combustion engine. A fuel injector is provided for spraying fuel into a combustion chamber and inserted into an opening formed in a cylinder head. The fuel injector has a contact surface for receiving a loading or thrust force. The contact surface extends about the nozzle of the fuel injector. A seal member is provided for sealing a space between the fuel injector and the opening. The thrust member has a fixing section and a thrust section. A fixing member affixes the thrust member onto the cylinder head at the fixing section and thereby loads the thrust section onto the contact surface to exert a upon the contact surface toward the combustion chamber. At least one of the thrust section and the fixing section has a convex surface.