Handheld engine-driven working machine
AssigneesYamabiko Corporation, Iida Denki Kogyo Co., Ltd.
InventorsShiro Yamaguchi, Takamasa Otsuji, Kosuke Matsumoto, Hiroyuki Miyaki, Akira Yamazaki
Life of this patent
Estimating the term…
Abstract
An engine-driven working machine includes a controller, which varies a control value of a solenoid valve so as to decrease or increase an opening degree of the solenoid valve when a rotating speed of an engine is within a predetermined high rotating speed range and the rotating speed of the engine is lower or higher than a predetermined rotating speed, respectively. When the control value of the solenoid valve is varied so as to decrease the opening degree of the solenoid valve and corresponds to a predetermined opening degree larger than a fully-closed state, the control value is set to a limitation value.
Claims3
An engine-driven working machine comprising:
- an engine including an electronically controlled carburetor;
- and
- a controller connected to the electronically controlled carburetor;
- wherein the electronically controlled carburetor includes a solenoid valve for adjusting an amount of supplying fuel into the electronically controlled carburetor,
- wherein the controller is programmed to vary a control value of the solenoid valve so as to increase an opening degree of the solenoid valve when a rotating speed of the engine is within a predetermined high rotating speed range and the rotating speed of the engine is higher than a target rotating speed;
- wherein the controller is programmed to vary the control value of the solenoid valve to a control calculation value calculated so as to decrease the opening degree of the solenoid valve, when the rotating speed of the engine is within the predetermined high rotating speed range, the rotating speed of the engine is lower than the target rotating speed, and the control calculation value is nearer a fully-opened state than a single limitation value which corresponds to a predetermined opening degree larger than a fully-closed state, and
- wherein the controller is programmed to set the control value of the solenoid valve to the limitation value when the rotating speed of the engine is within the predetermined high rotating speed range, the rotating speed of the engine is lower than the target rotating speed, and the control calculation value equals to or is nearer the fully-closed state than the limitation value.
Dependencies are inferred from the claim text.