JPS5685581A - Engine stop protecting device for hydraulic construction equipment - Google Patents
Engine stop protecting device for hydraulic construction equipmentInfo
- Publication number
- JPS5685581A JPS5685581A JP16388879A JP16388879A JPS5685581A JP S5685581 A JPS5685581 A JP S5685581A JP 16388879 A JP16388879 A JP 16388879A JP 16388879 A JP16388879 A JP 16388879A JP S5685581 A JPS5685581 A JP S5685581A
- Authority
- JP
- Japan
- Prior art keywords
- torque
- engine
- signal
- outputted
- flow rates
- 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
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
PURPOSE: To prevent an engine from stopping by a method wherein flow rates and delivery pressures of each hydraulic pump are detected, the torque outputted is calculated arithmetically and flow rates of each hydraulic pump are controlled so that they do not exceed the rated torque.
CONSTITUTION: The comparator 60 compares an input signal E with a set point signal Eo and when E>Eo, signals ea, eb are outputted. The arithmetic circuit 61 outputs an instruction signal for a pump flow rate shown when a torque is over the set point (E>Eo). When the signal is given, the maximum torque Tc that can be given per pump is operated to the rated torque To of an engine EN and a corresponding signal 1c is outputted and on the other hand, contact points 31a, 32a..., 3na are changed over to points 31b, 32b...3nb by the comparator output ea. And, the instruction signal 1c is given to electromagnetic hydrualic servo valves 71W7n and the flow rates of each hydraulic pump PM1WPMn are decreased to a value qc proportional to the instruction signal 1c. Accordingly the torque outputted T of the engine is equal to the rated toreuq To and the engine can be prevented from stopping.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16388879A JPS5685581A (en) | 1979-12-17 | 1979-12-17 | Engine stop protecting device for hydraulic construction equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16388879A JPS5685581A (en) | 1979-12-17 | 1979-12-17 | Engine stop protecting device for hydraulic construction equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5685581A true JPS5685581A (en) | 1981-07-11 |
JPS6332988B2 JPS6332988B2 (en) | 1988-07-04 |
Family
ID=15782698
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16388879A Granted JPS5685581A (en) | 1979-12-17 | 1979-12-17 | Engine stop protecting device for hydraulic construction equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5685581A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59106704A (en) * | 1982-12-09 | 1984-06-20 | Yanmar Diesel Engine Co Ltd | Traveling driving hydraulic circuit |
WO2014168058A1 (en) * | 2013-04-11 | 2014-10-16 | 日立建機株式会社 | Apparatus for driving work machine |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53110102A (en) * | 1977-03-09 | 1978-09-26 | Uchida Yuatsu Kiki Kogyo Kk | Method of controlling output of variable pump |
-
1979
- 1979-12-17 JP JP16388879A patent/JPS5685581A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53110102A (en) * | 1977-03-09 | 1978-09-26 | Uchida Yuatsu Kiki Kogyo Kk | Method of controlling output of variable pump |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59106704A (en) * | 1982-12-09 | 1984-06-20 | Yanmar Diesel Engine Co Ltd | Traveling driving hydraulic circuit |
JPH0124922B2 (en) * | 1982-12-09 | 1989-05-15 | Yanmar Diesel Engine Co | |
WO2014168058A1 (en) * | 2013-04-11 | 2014-10-16 | 日立建機株式会社 | Apparatus for driving work machine |
CN105143685A (en) * | 2013-04-11 | 2015-12-09 | 日立建机株式会社 | Apparatus for driving work machine |
US9506480B2 (en) | 2013-04-11 | 2016-11-29 | Hitachi Construction Machinery Co., Ltd. | Apparatus for driving work machine |
JPWO2014168058A1 (en) * | 2013-04-11 | 2017-02-16 | 日立建機株式会社 | Drive device for work machine |
Also Published As
Publication number | Publication date |
---|---|
JPS6332988B2 (en) | 1988-07-04 |
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