JPS57195839A - Method to control hydraulic system - Google Patents

Method to control hydraulic system

Info

Publication number
JPS57195839A
JPS57195839A JP7935281A JP7935281A JPS57195839A JP S57195839 A JPS57195839 A JP S57195839A JP 7935281 A JP7935281 A JP 7935281A JP 7935281 A JP7935281 A JP 7935281A JP S57195839 A JPS57195839 A JP S57195839A
Authority
JP
Japan
Prior art keywords
signal
engine
speed
value
neutral
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP7935281A
Other languages
Japanese (ja)
Other versions
JPS6231176B2 (en
Inventor
Yasuo Tanaka
Yukio Aoyanagi
Junichi Kajiwara
Takao Okochi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP7935281A priority Critical patent/JPS57195839A/en
Publication of JPS57195839A publication Critical patent/JPS57195839A/en
Publication of JPS6231176B2 publication Critical patent/JPS6231176B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To prevent rapid change of engine sound, vibration of vehicle body, etc., in the control of hydraulic system of a construction machine etc., gradually decreasing the engine operation speed to a low RPM when all the operation levers are brought to neutral for the suspension of the operation.
CONSTITUTION: In case loading part 5 such as an actuator directly connected to the engine 1 is being operated with the operation of either one of the operation levers 6, the revolution speed instruction signal NR is set to the signal NR1 through the control device 12, and the revolution speed of the engine 1 will be the value corresponding to the shift of the throttle lever 8. When the operation of the loading part 5 is brought to suspension by bringing all the operation levers 6 to neutral, the control circuit 12c will demand the value of signal NR minus extremely small change of signal ΔNR', in accordance with the processing procedure being stored in the memory circuit 12b. And if the value attains to the low speed RPM instruction signal NRo' the signal NR is set to the signal NRo' and the engine 1 is driven at the low RPM.
COPYRIGHT: (C)1982,JPO&Japio
JP7935281A 1981-05-27 1981-05-27 Method to control hydraulic system Granted JPS57195839A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7935281A JPS57195839A (en) 1981-05-27 1981-05-27 Method to control hydraulic system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7935281A JPS57195839A (en) 1981-05-27 1981-05-27 Method to control hydraulic system

Publications (2)

Publication Number Publication Date
JPS57195839A true JPS57195839A (en) 1982-12-01
JPS6231176B2 JPS6231176B2 (en) 1987-07-07

Family

ID=13687506

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7935281A Granted JPS57195839A (en) 1981-05-27 1981-05-27 Method to control hydraulic system

Country Status (1)

Country Link
JP (1) JPS57195839A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5914939U (en) * 1982-07-20 1984-01-30 愛知車輌株式会社 Automatic engine stop device for aerial work vehicles
JPS59231155A (en) * 1983-06-13 1984-12-25 Komatsu Ltd Apparatus for controlling engine used in construction machine
JPS60157946U (en) * 1984-03-30 1985-10-21 株式会社小松製作所 Engine control device for hydraulically driven vehicles
JPS61132733A (en) * 1984-11-30 1986-06-20 Hitachi Constr Mach Co Ltd Control equipment of motor for driving hydraulic system
JPS61169632A (en) * 1985-01-23 1986-07-31 Sumitomo Heavy Ind Ltd Engine rotation controller for industrial car
JPS61502114A (en) * 1984-05-14 1986-09-25 キヤタピラ−　トラクタ−　コムパニ− Hydrostatic vehicle control device
JPS6334338U (en) * 1986-08-21 1988-03-05
JPS6363223U (en) * 1986-10-14 1988-04-26

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5362524U (en) * 1976-10-26 1978-05-26

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5362524U (en) * 1976-10-26 1978-05-26

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5914939U (en) * 1982-07-20 1984-01-30 愛知車輌株式会社 Automatic engine stop device for aerial work vehicles
JPH0329558Y2 (en) * 1982-07-20 1991-06-24
JPS59231155A (en) * 1983-06-13 1984-12-25 Komatsu Ltd Apparatus for controlling engine used in construction machine
JPS60157946U (en) * 1984-03-30 1985-10-21 株式会社小松製作所 Engine control device for hydraulically driven vehicles
JPS61502114A (en) * 1984-05-14 1986-09-25 キヤタピラ−　トラクタ−　コムパニ− Hydrostatic vehicle control device
JPH0568387B2 (en) * 1984-05-14 1993-09-28 Caterpillar Inc
JPS61132733A (en) * 1984-11-30 1986-06-20 Hitachi Constr Mach Co Ltd Control equipment of motor for driving hydraulic system
JPS61169632A (en) * 1985-01-23 1986-07-31 Sumitomo Heavy Ind Ltd Engine rotation controller for industrial car
JPS6334338U (en) * 1986-08-21 1988-03-05
JPS6363223U (en) * 1986-10-14 1988-04-26

Also Published As

Publication number Publication date
JPS6231176B2 (en) 1987-07-07

Similar Documents

Publication Publication Date Title
JPS5536140A (en) Gear-shift controlling apparatus of automatic transmission
JPS5512264A (en) Revolution rate control method for internal-combustion engine
JPS57195839A (en) Method to control hydraulic system
JPS5618036A (en) Fuel controller
JPS5611518A (en) Control unit for constant speed running for vehicle
JPS5724433A (en) Control method of idle speed
JPS5496628A (en) Controlling system of engine revolution
JPS5644433A (en) Method of adjusting idling revolution speed
JPS5685540A (en) Air-fuel ratio controlling device
JPS55139941A (en) Accelerator of cylinder number control engine
JPS5532968A (en) Engine control system for construction machine
JPS5598630A (en) Control system for controlling revolutional speed of engine during idling operation of the same
JPS5287527A (en) Dash pot
JPS5623565A (en) Method for feedback control of ignition time
JPS55123529A (en) Neutral running control method and device thereof
JPS54100031A (en) Method of driving steering mechanism of car
JPS6456939A (en) Throttle valve controller
JPS55109739A (en) Method of and apparatus for controlling speed at low-speed running
JPS55117045A (en) Vehicle speed control method and device thereof
JPS54158528A (en) Air-fuel ratio controller
JPS5758520A (en) Fuel-cut control for car with automatic transmission
JPS57204357A (en) Speed change controller of gear speed changer for vehicle
JPS57116184A (en) Input restriction unit for hydraulic pump
JPS5639349A (en) Automatic transmission system of electronic control type
JPS57200629A (en) Fuel injection amount controlling device