Engine control system for construction machine

Details Engine control system for construction machine Engine control system for construction machine

1998-06-09

2000-02-01

Ponomarenko, N.

Prime-mover dynamo plants

Electric control

Engine control

290 40A, 123496, F02M 3900

Patent

active

060206519

ABSTRACT:
A pump controller (40) calculates a pump maximum absorbing horsepower and a pump required horsepower based on an accelerator signal, a pump delivery pressure and an operation signal, determines an engine required horsepower (PN) by selecting minimum one of both horsepower values, and calculates a pump required revolution speed based on the accelerator signal, the operation signal and an engine revolution speed signal to determine an engine required revolution speed (NN). The engine controller (40) determines, from the engine required horsepower (PN), a required-horsepower-referenced target engine revolution speed (NK) at which a fuel consumption rate is minimized, and selects larger one of the engine required revolution speed (NN) and the target engine revolution speed (NK) as an engine target revolution speed (NZ) to control an injected fuel amount and fuel injection timing, thereby controlling an engine torque and an engine output revolution speed. Improved operability and less noise can be achieved, and the fuel consumption rate of an engine can be controlled in an optimum way to reduce the fuel consumption rate.

REFERENCES:
patent: 4558679 (1985-12-01), Koyanagi
patent: 4606313 (1986-08-01), Izumi et al.
patent: 5251440 (1993-10-01), Bong-dong et al.
patent: 5311063 (1994-05-01), Hubler
patent: 5718200 (1998-02-01), Chujo et al.
patent: 5878721 (1999-03-01), Nakamura

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