Honda Motor Co., Ltd.

Riyuuhei Tamamoto

Makoto Yamamura

Mitsuyoshi Kanai

Tadayuki Yoneyama

In an engine which starts using a recoil starter, ignition chance during inertia rotation is not missed. If the engineis rotated by the recoil starter, output of a power generator which is directly connected to the engineis increased, and a CPUis reset at timing t. At timing t, if pulse Pis input from a revolution number sensorto the CPU, the CPUoutputs first ignition instructions when predetermined time Tis elapsed (t). At timing t, second pulse Pis input. At that time point, since the CPUis normally operated, ignition timing is obtained from an ignition timing mapin accordance with the revolution number calculated by a time interval between the pulses Pand P, and the ignition instructions are output at timing tin accordance with the ignition timing. Thereafter, the ignition timing is determined using the ignition timing map

Engine starting apparatus

In an engine of a working machine having no governor mechanism, the engine revolution speed is controlled such that the revolution speed can stably be maintained irrespective of the variation in load without adjusting the throttle opening to exploit the full potential of the engine. Since an enginedoes not have the governor mechanism, an operator adjusts the throttle opening and controls the engine revolution speed. A map in which ignition timing (amount of angle of lead) is set by means of functions of the engine revolution speed is stored in an ignition timing map. The mapis set such that the engine revolution speed is equal to or higher than a value to be controlled (e.g. 7000 rpm), and the ignition timing is lagged as compared with a case in which the engine revolution speed is lower than the value to be controlled.

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Wako, Japan

Riyuuhei Tamamoto