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In port injection, it is difficult to control in-cylinder fuel supply of each cycle in a transient state as cold start (in this paper, cold start is defined as several cycles from cranking at low engine temperature). Hence, THC, which is one of regulated emission gases, is likely to increase at cold start. As one of THC emission reduction approaches at cold start, the optimization of fuel injection specifications (including injection position and spray diameter) is expected to reduce THC emission. Setting injection position as downstream position is expected to secure the in-cylinder fuel supply amount at cold start because of small fuel adhesion amount on an intake port wall and a short distance between the injection position and in-cylinder. The position injection contributes to reduction of THC emission due to elimination of misfire.

As for automobile, the mass production period of Electric Vehicle(EV) has begun by the rapid progress of the battery performance. But for EV-Motorcycle(MC), it is limited for the venture companies' releases. The design and evaluation methodologies are not yet established or standardized so far. This paper provides the practical and the experimental examples. To study the feasibility of EV-MC, we developed the prototypes in the present technical and suppliers' parts environments, and evaluated them by the practical view of the MC usage. The developed EV-MC has the equivalent driving performance of the 250cc internal combustion engine(ICE)-MC and a cruising range of 100km in normal use.

Generally, it is thought that control is simpler than an Internal Combustion Engine (ICE)-Motorcycle(MC) as for the Electric Vehicle(EV) type MC. However, there is few characteristic to the ICE-MC to the EV-MC and it cannot get good performance without control for EV-MC. We study the methodology for design and evaluation an EV-MC. In this approach, we developed the prototype EV-MC having manual transmission. In our study, we think that EV-MC having manual transmission is feature in comparison with other general EV-MC. From this feature, we had to develop the function control in addition to standard EV-MC function control. This paper provides a function control for EV-MC having manual transmission. In this paper, we arrange the problem points of EV-MC which put electric propulsion motor and manual transmission together at first. And report the result that studied a method to solve the problem points.