Crowell & Moring LLP
Engine control system for construction machine
To provide an engine control system for a construction machine, which can decrease a consumption of energy to be required for the reduction of an engine lag-down that occurs upon a sudden increase in load, such as upon quick manipulation of a control device, is provided with a load condition detecting unit, a charge amount detecting unit, a boost pressure sensor, and a determination processing unit. The load condition detecting unit includes a manipulation stroke detector for detecting that a control device has been fully manipulated, and also, a first computation unit of a controller. The charge amount detecting unit can detect an amount of charge in a capacitor. The determination processing unit includes a determination processing unit of the controller. The determination processing unit performs processing to feed electric power from the capacitor to an electric motor if, when it has been detected in concomitance with manipulation of the control device by the load condition detecting means that a torque to be absorbed by a pump would exceed an output torque of an engine, a boost pressure detected by the boost pressure sensor is determined to be lower than a predetermined pressure, and moreover, an amount of charge in the capacitor as detected by the charge amount detecting unit is determined to be an amount of charge that can drive the electric motor for a predetermined time.
Hitachi Construction Machinery Co., Ltd.
B B E B B Y B B B Y B Y B E E B B B Y B B
B60W B60W E02F B60L B60W Y02T B60W B60W B60Y Y02T B60K Y02T B60L E02F E02F B60W B60Y B60W Y02T B60L B60W
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Akihiro Yasuo Hidetoshi
Narazaki Okano Satake