Abstract: A fuel injection system operates under a predetermined substantially constant pump speed and creates multi-pressure levels by diverting the fuel flow. Fuel pressure can be switched from one steady pressure level to another level on-demand instantly. This superimposes and overlaps typical fuel injection events in the linear operating ranges under different pressure levels, significantly increasing the fuel injection dynamic range. The dynamic range is further increased when another predetermined constant pump speed is assigned. Thus, the system saves fuel and reduces exhaust emission in city driving when gas pedal is released including idle. The same system can instantly deliver additional fuel on-demand for extra power beyond engine rating producing a sport-car-like performance.

Abstract: A fuel injection system operates under a substantially constant pump speed and creates multi-pressure levels by diverting the fuel flow. Fuel pressure can be switched from one steady pressure level to another level on-demand instantly. This superimposes and overlaps typical fuel injection events in the linear operating ranges under different pressure levels, significantly increasing the fuel injection dynamic range. Lower fuel injection when idle or during city driving reduces fuel consumption per mile traveled and reduces exhaust emission that causes smog in metropolitan areas. The system delivers additional power to the engine instantly at peak load on-demand, reduces idle speed with the engine running smoothly, does not change fuel tank temperature, and may enhance the life of the fuel pump.

Abstract: A multi-ink jet printer contains n nozzle orifices, which are aligned in one or two nozzle orifice arrays with its axis (or axes) substantially parallel to the relative print direction. All print droplets generated from nozzle orifices are individually charged and are deflected under a common deflection electric field substantially perpendicular to the relative print direction. All nozzle orifices may be individual single jets, or may be formed on an orifice plate sharing the same ink system, same stimulation, same deflection electrodes and the same ink collector. Using the interlacing schemes described in this teaching, the said multi-ink jet printer can print marks, characters, or graphics on receiving medium at n times the print speed of a single jet printer and still maintaining excellent print quality.