Abstract: The compression self-ignition engine fuel injection control device is configured to, during one combustion stroke, perform multiple fuel injections to induce multiple combustions in a cylinder. The fuel injection control device comprises a PCM (70) configured to set an interval between a pre-injection and a main injection in the multiple fuel injections, so as to allow valley regions of a curve indicative of a frequency characteristic of a combustion pressure wave generated by the multiple combustions to fall within respective ranges of a plurality of resonant frequency bands of a structure of an engine body of the engine, wherein the PCM is operable to increase a fuel injection amount of the pre-injection more largely as an engine load becomes lower at the same engine speed.

Abstract: The compression self-ignition engine fuel injection control device is configured to, during one combustion stroke, perform multiple fuel injections to induce multiple combustions in a cylinder. The fuel injection control device comprises a PCM (70) configured to set an interval between temporally-adjacent two of the multiple fuel injections, so as to allow valley regions of a curve indicative of a frequency characteristic of a combustion pressure wave generated by the multiple combustions to fall within respective ranges of a plurality of resonant frequency bands of a structure of an engine body of the engine, wherein the PCM is operable to increase the interval between the temporally-adjacent multiple fuel injections to 1.7±0.1 msec.

Abstract: A fuel injection control apparatus for an engine in which fuel is injected into a cylinder a plurality of times to cause a plurality of combustions is provided, which includes a controller for controlling a time interval of performing the plurality of fuel injections so that a waveform indicating a frequency characteristic of a combustion pressure wave that is produced by each of the plurality of combustions has valley points at frequencies within a plurality of resonant frequency bands of a structural system of the engine, respectively.

Abstract: In order to reduce bending vibration of a connecting rod, a dynamic absorber (50) configured to reduce the bending vibration of the connecting rod (10) is provided on a piston (1).

Abstract: A connecting rod structure includes a connecting rod for coupling a crankshaft to a piston, the connecting rod including a larger end part formed with a shaft insertion hole for the crankshaft, a smaller end part formed with a pin insertion hole for a piston pin which couples the piston to the smaller end part, and a coupling part for coupling the larger end part to the smaller end part; and a dynamic absorber provided to the larger end part for suppressing the piston, the piston pin, and the connecting rod from integrally resonating with respect to the crankshaft. The dynamic absorber includes a fixed part fixed to the larger end part and a supporting part for coupling the fixed part to a mass part and supporting the mass part to be movable in substantially longitudinal directions of the connecting rod with respect to the fixed part.

Abstract: An engine piston structure includes: a piston (1); a connecting rod (10) having a small end part (10a) coupled to the piston (1), and having a large end part (10b) coupled to a crankshaft; a piston pin (2) through which the piston (1) and the small end part (10a) of the connecting rod (10) are coupled together and which has a hollow cross section; and at least one dynamic vibration absorber (20) provided inside the piston pin (2) to reduce resonance of the piston (1), the piston pin (2), and the small end part (10a) of the connecting rod (10) in combination with respect to the large end part (10b) of the connecting rod (10) during a combustion stroke.

Abstract: An optoelectronic combination connector includes a plug unit having an optoelectronic converter and a receptacle unit detachably attached to the plug unit. The plug unit has a fiber securing member with a groove, so that an optical fiber cable connected to the optoelectronic converter is secured to the groove with an adhesive. In the optoelectronic combination connector, the optical fiber cable preferably has an outer cover formed of polyvinylidene fluoride or a fluoro-resin.