US 7,320,306 B2
Engine revolution controller of working machine
Riyuuhei Tamamoto, Wako (Japan); Tadayuki Yoneyama, Wako (Japan); Makoto Yamamura, Wako (Japan); and Mitsuyoshi Kanai, Wako (Japan)
Assigned to Honda Motor Co., Ltd., Tokyo (Japan)
Appl. No. 10/581,209
PCT Filed Nov. 19, 2004, PCT No. PCT/JP2004/017235
§ 371(c)(1), (2), (4) Date Jun. 01, 2006,
PCT Pub. No. WO2005/054666, PCT Pub. Date Jun. 16, 2005.
Claims priority of application No. 2003-403095 (JP), filed on Dec. 02, 2003.
Prior Publication US 2007/0125341 A1, Jun. 07, 2007
Int. Cl. F02P 5/15 (2006.01); F02D 9/02 (2006.01); F02D 43/00 (2006.01)
U.S. Cl. 123—350  [123/406.23] 3 Claims
OG exemplary drawing
 
1. An engine revolution controller of a working machine in which the engine revolution speed is adjusted by operation of a throttle opening operating device without depending on mechanical governor means to cope with load variation, the engine revolution controller comprising ignition timing determining means which lag the ignition timing of an engine ignition device to suppress the engine revolution speed from further increasing in a region where the engine revolution speed is equal to or higher than a predetermined revolution speed, thereby substantially keeping the predetermined revolution speed without operating the throttle opening operating device with respect to the load variation of the engine;
wherein an upper limit of the throttle opening is limited to a value closer to a close side than a fully opened position.