Method and apparatus for operating a drive unit

Details Method and apparatus for operating a drive unit Method and apparatus for operating a drive unit

1991-04-30

1992-01-14

Nelli, Raymond A.

Internal-combustion engines

Engine speed regulator

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

F02D 3100

Patent

active

050800620

ABSTRACT:
A method for operating a drive unit comprised of an internal combustion engine having a hydraulic aggregate group connected to it. The amount of fuel supplied to the engine in the upper idling speed range is limited by a proportionally acting speed regulator. The power consumption of the hydraulic aggregate group is reduced by a maximum load regulator when the engine is overloaded. Theretofore the hydraulic aggregate group is adjusted toward a lower power consumption after the engine speed drops below an arbitrarily rated RPM which is monitored by the maximum load regulator. In order to facilitate a variable power limitation without the use of a hydraulic power limiter, the working RPM of the maximum load regulation is set at an arbitrary value corresponding to a desired power output between the nominal speed of the engine and the upper idling speed of the engine. In order to reduce the precision imposed on the maintenance of the rated RPM a positive RPM feedback is provided so that the idling control characteristic becomes flatter.

REFERENCES:
patent: 4780827 (1988-10-01), Fujimori et al.
patent: 4785777 (1988-11-01), Hock et al.
patent: 4787352 (1988-11-01), Anderson
patent: 4843553 (1989-06-01), Ohata
patent: 4860707 (1989-08-01), Ohata
patent: 4877003 (1989-10-01), Shimpmura et al.
patent: 4898137 (1990-02-01), Fujita et al.
patent: 4905785 (1990-03-01), Kieffer et al.

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