| US 7,353,105 B2 | ||
| Engine control device for construction machinery | ||
| Hisaho Mino, Chiba (Japan); and Nobuyuki Baba, Chiba (Japan) | ||
| Assigned to Sumitomo (SHI) Construction Machinery Manufacturing Co., Ltd., Chiba-Ken (Japan) | ||
| Filed on Sep. 19, 2006, as Appl. No. 11/523,236. | ||
| Claims priority of application No. 2005-374406 (JP), filed on Dec. 27, 2005. | ||
| Prior Publication US 2007/0150166 A1, Jun. 28, 2007 | ||
| Int. Cl. G06F 19/00 (2006.01); F02D 41/00 (2006.01) | ||
| U.S. Cl. 701—110 [123/350] | 4 Claims |
| 1. An engine controlling device for construction machinery for switchably controlling a rotational speed of an engine between
a normal mode in a range of a higher rotational speed and an energy saving mode in a range of a lower rotational speed, comprising:
speed detecting means for detecting vehicle speed;
engine electronic controlling means for controlling the rotational speed of the engine; and
an onboard controller for sending a command signal to the engine electronic controlling means based on a value detected by
the speed detecting means to switch the rotational speed of the engine to either the normal mode or the energy saving mode;
wherein
when vehicle speed is changed by workload in the energy saving mode to be lower than a predetermined range, the on-board controller
commands the engine electronic controlling means to switch the rotational speed of the engine to the normal mode.
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