Control method at truck

Details Control method at truck Control method at truck

2005-02-01

2005-02-01

Look, Edward K. (Department: 3745)

Power plants

Pressure fluid source and motor

With control means for structure storing work driving energy

C060S413000

Reexamination Certificate

active

06848253

ABSTRACT:
Method to control the lowering movement of the lifting cylinder or cylinders (1, 2) of a truck. When a lowering is to take place the pump (5) is started in the pumping direction for increasing the pressure between the pump and a loadholding valve (3, 4) until essentially the pressure has been achieved as in the hydraulic cylinder (1, 2), whereafter the pump with its motor is switched over to regenerative operation, that is the pump works as motor and the motor as generator. The holding valve (3, 4) is opened so that the oil while driving the pump can flow back through this.

REFERENCES:
patent: 3779017 (1973-12-01), Fujisawa et al.
patent: 5579868 (1996-12-01), Pelto-Huikko
patent: 6005360 (1999-12-01), Pace
patent: 6460332 (2002-10-01), Maruta et al.
patent: 6502393 (2003-01-01), Stephenson et al.

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