Apparatus for and method of controlling engine RPM in hydraulic

Details Apparatus for and method of controlling engine RPM in hydraulic Apparatus for and method of controlling engine RPM in hydraulic

1995-11-29

1996-12-24

Argenbright, Tony M.

Internal-combustion engines

Engine speed regulator

Having condition responsive means with engine being part of...

123357, F02D 2904

Patent

active

055865364

ABSTRACT:
An apparatus for and a method of controlling the engine RPM in hydraulic construction equipment, being capable of detecting a neutral valve position corresponding to the idle state of the construction equipment and controlling the engine to drive at a low RPM while the construction equipment is in its idle state, thereby achieving a reduced noise generation and reduced fuel consumption. The apparatus includes an engine RPM detecting unit for detecting the RPM of the engine, an engine RPM control unit for controlling the engine RPM, a pressure detecting unit for detecting the pressure in a fluid line connected between a hydraulic pump driven by the engine and main valves for actuating actuators, and a control unit for determining whether every main valve is in its neutral position, through a functional computation for a pressure value detected by the pressure detecting unit with a predetermined reference value, and controlling the engine RPM controlling unit to decrease the engine RPM when every main valve is determined as being in its neutral position.

REFERENCES:
patent: 4779591 (1988-10-01), Tordenmalm
patent: 4955344 (1990-09-01), Tatsumi et al.
patent: 4989567 (1991-02-01), Fujioka

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