Control method at truck
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United States of America Patent
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-
Feb 1, 2005
Grant Date -
Jan 8, 2004
app pub date -
Jun 3, 2003
filing date -
Jun 5, 2002
priority date (Note) -
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status (Latency Note)
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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.
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