JPS57195839A - Method to control hydraulic system - Google Patents
Method to control hydraulic systemInfo
- 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
Links
Landscapes
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Fluid-Pressure Circuits (AREA)
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
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5362524U (en) * | 1976-10-26 | 1978-05-26 |
-
1981
- 1981-05-27 JP JP7935281A patent/JPS57195839A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5362524U (en) * | 1976-10-26 | 1978-05-26 |
Cited By (10)
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 |
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