Title:
TRAVELLING SPEED CONTROL DEVICE OF HYDRAULIC DRIVEN VEHICLE
Document Type and Number:
Japanese Patent JP2744706
Kind Code:
B2
Abstract:
PURPOSE: To run a vehicle at a specific speed by deciding a displacement volume at which the flow of a hydraulic pump is made at the maximum value corresponding to a specific speed in the area of the rotation frequency of a motor, and limiting the control displacement volume by this maximum displacement volume.
CONSTITUTION: In a running condition of a vehicle, a function generator 241a receives a pump pressure signal p from a pump pressure sensor 27, and calculates the first displacement volume q1, which is output to a minimum value selection circuit 24c. A function generator 241b receives an engine rotation frequency signal N from an engine rotation frequency sensor 26, and calculates the second displacement volume q2, which is output to the circuit 241c. The circuit 241c selects the smaller side either the displacement volumes q1 or q2, so as to calculate an object displacement volume qi, which is output to a regulator 9. Furthermore, the regulator 9 controls a hydraulic pump 1 depending on the object displacement volume qi, and drives the engine 21.
Inventors:
Kazuhiro Ichimura
Akira Tatsumi
Akira Tatsumi
Application Number:
JP3545091A
Publication Date:
April 28, 1998
Filing Date:
February 05, 1991
Export Citation:
Assignee:
Hitachi Construction Machinery Co., Ltd.
International Classes:
E02F9/22; (IPC1-7): E02F9/22
Attorney, Agent or Firm:
Fuyuki Nagai
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