Abstract: This invention relates to an event timing apparatus for an internal combustion engine, and more particularly to an improved control arrangement for a fuel injection and ignition arrangement. In accordance with this invention, a timing detecting arrangement is disclosed having a timing correcting circuit for correcting deviations between the actual timing measurements made and the true, desired timing signal required for accurate operation of the fuel injection system. Thus, a fuel injection system and ignition system is provided that is able to provide accurate crank angle timing measurements with reference to which crank chamber pressure and other measurements may be made, in spite of possible manufacturing and/or assembling variations in the timing measuring means. The way in which the manufacturing or assembling of variations are measured is also disclosed.

Abstract: An apparatus for controlling the speed of a direct fuel injected, scavenged two stroke engine comprises engine speed sensing means for determining the speed of revolution of an engine and means for sensing the degree to which the throttle. A comparing device produces a signal corresponding to the difference between the engine speed sensed by the engine speed sensing means and a predetermined engine speed corresponding to the degree of throttle opening. An control device adjusts an engine running parameter based on this difference.

Abstract: An apparatus for controlling the speed of a direct fuel injected, scavenged, two-stroke engine comprises a first sensor for sensing the degree to which the throttle is open, means for sensing whether the intake air amount is in the air-excess range, means for sensing whether the degree to whcih the throttle is open has been substantially constant for a predetermined amount of time, a sensor for sensing the engine revolution speed, means for producing a desired engine revolution speed based on the degree to which the throttle is open, and means for producing a signal coresponding to the difference between the engine revolution speed and the desired engine speed, when the degree to which the throttle is open has been substantially constant for the predetermined amount of time. A control device adjusts an engine running parameter based on this difference, to reduce this difference.

Abstract: This invention relates to a fuel injection apparatus for an internal combustion engine, and more particularly to an improved control arrangement for a fuel injection arrangement. In accordance with the invention, an arrangement is disclosed for determining the mass of air taken into the engine crankcase chamber by calculating an average intake air mass which is based not on pressure measurements taken upon each crankshaft rotation individually, but on the arithmetical mean of such pressure measurements taken during a plurality of crankshaft rotations. Thus, a fuel injection control system is achieved which senses differences in crankcase pressure and which eliminates the effects of abnormal changes in crankcase pressure due to effects other than the amount of air inducted.

Abstract: A number of embodiments of combustion chamber configurations that provide a very shallow height squish area but the head of the piston does not, at its periphery, extend above the cylinder block and into the area where the cylinder head gasket lies.

Abstract: Several embodiments of fuel injection controls for two-cycle crankcase compression internal combustion engines. In each embodiment, the fuel injection is controlled by measuring the amount of air inducted through measurement of the pressure generated in the crankcase. In each embodiment, abnormal pressure variations in the crankcase not due to the amount of air inducted are eliminated by measuring the pressures at predetermined crankshaft angles. In some embodiments, this is done through the use of a valving arrangement and in other embodiments, this is done electronically.