Abstract: A direct fuel injector is positioned to provide better fuel atomization within the combustion chamber. The direct fuel injector is disposed between an intake manifold and a cylinder head assembly thereby eliminating the need for additional fuel delivery conduits, thus decreasing the size of the engine and lowering the production costs of the outboard motor. The direct fuel injector position permits immediate air/fuel mixture adjustments allowing improved acceleration enrichment and lean stratified charge operation. The direct fuel injector position and routing of induction system components allows for compact placement of auxiliary components. The integrated direct fuel injector position enables the operator to enjoy compact engine design, improved engine performance and increased fuel efficiency.

Abstract: An engine includes a throttling device configured for both mechanical and electrical control. For example, the throttling device can include a throttle cable connection assembly configured to allow a throttle valve shaft of the throttling device to be controlled by movement of throttle cables and an electronic control section configured to allow the throttle valve to be moved by an electronic actuator. The throttling device can include a connector member configured to selectively engage and disengage the mechanical control section from the throttle valve shaft so as to allow the electrical control section to adjust the throttle valve shaft without resistance from the mechanical control section. The engine can also include a switch for indicating to an electronic controller whether or not the mechanical control section is engaged with a throttle valve shaft.

Abstract: A marine drive has a propulsion device. A transmission is coupled with the propulsion device. A shift mechanism moves the transmission between a first position in which the propulsion device is set to a first mode and a second position in which the propulsion device is set to a second mode. The shift mechanism has a shift unit movable between a first shift position and a second shift position. The transmission moves to the first position while the shift unit moves toward the first shift position, and moves to the second position while the shift unit moves toward the second shift position. An electrically operable shift actuator is supported by the drive body. The shift actuator has an actuating member that preferably is detachably coupled with the shift unit.

Abstract: A direct fuel injector is positioned to provide better fuel atomization within the combustion chamber. The direct fuel injector is disposed between an intake manifold and a cylinder head assembly thereby eliminating the need for additional fuel delivery conduits, thus decreasing the size of the engine and lowering the production costs of the outboard motor. The direct fuel injector position permits immediate air/fuel mixture adjustments allowing improved acceleration enrichment and lean stratified charge operation. The direct fuel injector position and routing of induction system components allows for compact placement of auxiliary components. The integrated direct fuel injector position enables the operator to enjoy compact engine design, improved engine performance and increased fuel efficiency.

Abstract: An exhaust system for an internal combustion engine of an outboard motor is provided. The exhaust system provides dual exhaust passages, simplifying the engine's construction and reducing manufacturing costs, while optimizing engine performance. The exhaust system includes exhaust ports having equal lengths that avoid differential pressure losses across cylinders. The arrangement of the exhaust passages enables a cowling to have a tapered aerodynamic design.

Abstract: A valve cam mechanism for a four-cycle engine includes an improved construction. The engine includes at least one camshaft having cam lobes to activate at least one of an intake valve and an exhaust valve. The camshaft defines an aperture next to at least one of the cam lobes. The aperture extends generally normal to an axis of the camshaft. A decompression mechanism is provided for manual starting of the engine. The decompression mechanism includes a shaft extending through the aperture. An actuator is affixed to the shaft for pivotal movement about an axis of the shaft. The actuator has a first section arranged to hold the intake or exhaust valve in an open position when the actuator exists in an initial position. A second section is arranged to initially retain the actuator in the initial position and to release the actuator from the initial position when the camshaft rotates. The shaft is rigidly supported by an inner surface of the aperture in part.

Abstract: A semiconductor test system is capable of generating timing edges in the same direction having a time interval smaller than a reference clock cycle. The semiconductor test system includes a waveform memory for storing edge data which defines edges of a test signal waveform, a timing generator for generating timing data and a timing pulse for each test cycle, a wave formatter for generating a set signal and a reset signal for producing the test signal waveform in response to the timing data and the timing pulse, and a virtual timing generator for detecting a relationship between previous edge data and current edge data from the waveform memory and removing the current edge data when the current edge data is the same as the previous edge data and allocating the current edge data to a time position where there is an actual change of edge in the test signal waveform.

Abstract: A valve cam mechanism for a four-cycle engine includes an improved construction. The engine includes at least one camshaft having cam lobes to activate at least one of an intake valve and an exhaust valve. The camshaft defines an aperture next to at least one of the cam lobes. The aperture extends generally normal to an axis of the camshaft. A decompression mechanism is provided for manual starting of the engine. The decompression mechanism includes a shaft extending through the aperture. An actuator is affixed to the shaft for pivotal movement about an axis of the shaft. The actuator has a first section arranged to hold the intake or exhaust valve in an open position when the actuator exists in an initial position. A second section is arranged to initially retain the actuator in the initial position and to release the actuator from the initial position when the camshaft rotates. The shaft is rigidly supported by an inner surface of the aperture in part.

Abstract: A direct injected, internal combustion engine combustion chamber configuration that employs a shrouded arrangement for the intake valve seat so as to generate a tumble motion under at least some running conditions. This is accomplished by a shrouding of the intake valve in such a way that the flow direction effects a tumbling motion and also so that the air flow does not adversely affect the flow from the injector nozzle.

Abstract: A timing generator for a semiconductor test system having an interleave architecture with no interleave jitters. The timing generator includes a plurality of timing data generators arranged in a parallel fashion and provided with a first clock signal in which each of the timing data generator produces a coarse timing signal and a delay time data based on timing data provided by a test program, a multiplexer provided with a second clock signal having a frequency higher than the first clock signal for receiving the coarse timing signals and delay data in parallel and produces selected one of coarse timing signal and the delay data in series, and a variable delay circuit which receives the coarse timing signal and the delay data from the multiplexer for providing a delay time defined by the delay data to the coarse timing signal.

Abstract: A number of embodiments of variable valve actuating systems wherein the valve is operated selectively by either first or second rocker arms both of which are supported for pivotal movement on the same rocker arm shaft but which are operated by different cams and have different lifts. Only one of the rocker arms directly operates the valve. The lift is changed by selectively coupling the rocker arms for simultaneous operation. A number of variations in locations and valve actuation are disclosed as well as a variable induction system that cooperates with the variable valve actuation to improve the engine performance over a wider range of speeds and loads. The coupling between the rocker arms includes a replaceable adjusting shim.

Abstract: A direct cylinder injected internal combustion engine that is effective to provide a stratified stoichiometric mixture at the spark gap at the time of firing and also a homogenous mixture under high speed high load conditions. This is achieved without specially formed bowls in the head of the piston by creating tumble under low speed and lower load conditions and by spraying on the heads of the intake valves during high speed high load conditions to obtain a homogeneous mixture.

Abstract: A direct injected, internal combustion engine wherein the fuel injector is mounted under the intake passage arrangement in the cylinder head. A cooling jacket is provided in the cylinder head that substantially encircles the injector. Also the water delivery system insures a full flow of water through the injector cooling jacket.

Abstract: A number of embodiments of variable valve actuating systems wherein the valve is operated selectively by either first or second rocker arms both of which are supported for pivotal movement on the same rocker arm shaft but which are operated by different cams and have different lifts. Only one of the rocker arms directly operates the valve. The lift is changed by selectively coupling the rocker arms for simultaneous operation. A number of variations in locations and valve actuation are disclosed as well as a variable induction system that cooperates with the variable valve actuation to improve the engine performance over a wider range of speeds and loads.

Abstract: A fine variable delay circuit includes a buffer having an input connected to a signal input terminal and an output. The buffer has an output impedance and outputs a logical level from the output. The fine variable delay circuit also includes a schmidt trigger buffer having an input connected to the output of the buffer and an output connected to a signal output terminal, a CMOS transistor having a gate and two electrodes, the gate being connected to a connection point between said buffer and said schmidt trigger buffer.

Abstract: An improved air spring arrangement for an internal combustion engine having three valves per cylinder which are disposed in surrounding relationship to a spark plug. The air spring arrangement is formed by a recess formed in the cylinder head that encompasses each of the valve stems and an insert piece that is inserted into this recess and which defines the bores for the respective air chambers. The supply and relief passages for the air chambers are formed in the insert piece by drilled passages which have a V-shaped configuration to provide a more compact assembly and a less complicated cylinder head arrangement.

Abstract: First and second exclusive-OR gates (hereinafter referred to as EXOR gates) are provided, which are both connected at one input side to a delay input terminal. The other input side of the first EXOR gate is grounded and the other input side of the second EXOR gate is connected to a select signal input terminal. A capacitor is connected between the output side of the first EXOR gate and the output side of the second EXOR gate. The output side of the first EXOR gate is connected to a delay output terminal by way of a buffer which outputs logical levels. The buffer has a threshold value and outputs one or the other binary logical level depending on whether the input thereto is above or below a threshold value.

Abstract: The gate of a CMOS transistor formed by a series connection of p-channel and n-channel FETs 21 and 22 is connected to an input terminal 23, and the drain of the CMOS transistor is connected to an output terminal 24. The source of the FET 21 is connected to a positive power supply terminal 20 via parallel-connected switchable resistance elements 37.sub.0, 37.sub.1, 37.sub.2, . . formed by p-channel FETs and having resistance values R.sub.0, R.sub.1, R.sub.2, . . . , respectively. The source of the other FET 22 is connected to a negative power supply terminal 30 via parallel-connected switchable resistance elements 38.sub.0, 38.sub.1, 38.sub.2, . . . formed by n-channel FETs and having resistance values R.sub.0, R.sub.1, R.sub.2, . . . , respectively. Delay setting signals S.sub.0, S.sub.1, . . . are decoded by a decoder 39 and one of more of its output terminals Y.sub.0, Y.sub.1 , . . . go to the high level. The output terminals Y.sub.0, Y.sub.1, Y.sub.2, . . .

Abstract: A plurality of delay stages are connected in cascade, each delay stage having a construction in which either one of a path of a delay element utilizing the propagation delay of a gate array and a path not passing through the delay element is selected by a path selector. Each bit of control data is used to control the path selector of the corresponding delay stages. Composite delays are measured for all combinations of such paths, control data which provides a measured composite delay closest to an intended delay corresponding to each set data is determined and is prestored in a main conversion table. A prediction is made, through calculation, as to a delay for each control data when ambient temperature rises .DELTA.T.degree.C. from a temperature T.sub.

Abstract: A driving system for driving valves and an auxiliary machine has a gear train for transmitting power of an engine from a crankshaft to a drive shaft, a first belt drive device for transmitting the power from the drive shaft to a camshaft of the engine, and a second belt drive device for transmitting the power from the crankshaft to a shaft of an auxiliary machine. The first belt drive device and the second drive device are disposed on a same plane with respect to the crankshaft.