SYSTEM FOR CONTROLLING REVOLUTION FREQUENCY OF PRIME MOVER IN HYDRAULICALLY DRIVEN VEHICLE

Title:

SYSTEM FOR CONTROLLING REVOLUTION FREQUENCY OF PRIME MOVER IN HYDRAULICALLY DRIVEN VEHICLE

Document Type and Number:

WIPO Patent Application WO/1992/014046

Kind Code:

A1

Abstract:

The system comprises a hydraulic pump (1) driven by an engine (21); a hydraulic motor (4) for running, driven by oil discharged from the hydraulic pump (1) during running; an actuator (52) for working, driven by oil discharged from the hydraulic pump (1) during working; a running pedal (6) for controlling a running speed in accordance with a manipulated variable during running; a reduced speed determining means (33) for determining the reduced depression of the running pedal (6); and a revolution frequency controller (33). The revolution frequency controller (33) performs a regular control for increasingly or decreasingly controlling the revolution frequency of the engine in accordance with the depth of the depression of the running pedal (6), and slow-down control for decreasingly controlling the revolution frequency of the engine to match the reduced depth of the depression when the depth of the depression is determined to be reduced. Then, when the revolution frequency of the engine is to be adjusted by the running pedal (6) during working, even if the depth of the depression of the running pedal (6) is reduced, the slow-down control is prohibited.

Inventors:

ICHIMURA KAZUHIRO (JP)
TAMURA SEIJI (JP)
TATSUMI AKIRA (JP)
KIHARA MITSUO (JP)
HOSONO JUNICHI (JP)
ASANO KAZUO (JP)

Application Number:

PCT/JP1992/000115

Publication Date:

August 20, 1992

Filing Date:

February 05, 1992

Export Citation:

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Assignee:

HITACHI CONSTRUCTION MACHINERY (JP)

International Classes:

B60W10/06; B60W30/18; E02F9/22; F02B41/00; F02D29/04; (IPC1-7): B60K41/16; F02D29/04

Foreign References:

JPH02212603A	1990-08-23
JPH03135844A	1991-06-10
JPH0473331A	1992-03-09

Other References: