Patent EP0247335A2 successfully refreshed from Google Patents.
EP0247335A2
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EP
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Electrohydrolic system with distributed control
Assignee: Vickers Inc
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Filing: 1987-04-04
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Granted: —
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Expires: 2007-04-04
Abstract
Abstract An electrohydraulic system includes a plurality of electrohydraulic devices (30,32,34,36) individually controlled by microprocessor-based control electronics. The device controllers (30B,32B,34B,36B) are connected in common by a bidirectional serial data bus to a master controller (42) for coordinating operation of the various devices. Internal programming within the master controller (42) establishes a repetitive time-sequence of windows for communications with the various device controllers (30B,32B,34B,36B) for downloading control signals and parameters, and for uploading data indicative of system status and operation. The various device controllers include internal programming for operating the associated hydraulic devices as a function of control signals and parameters received from the master controller (42).
Inventors
- 👤 Thomas L. Edwards
- 👤 Yehia El M. Ibiary
- 👤 Rajamouli Gunda
- 👤 Richard S. Leemhuis
- 👤 Fred H. Phillips
- 👤 Melvin A. Rode
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 16:25
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/414; G05B2219/00; G05B2219/30; G05B2219/33; G05B2219/33337; G05B2219/41; G05B2219/41309
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
142 words
An electrohydraulic system with distributed control comprising a plurality of electrohydraulic devices (30,32,34,36) responsive to electronic control signals for performing hydraulic operations and control means for providing said control signals, said control means including a plurality of individual device control means (30B,32B,34B, 36B) each associated with and dedicated to directly controlling operation at an associated hydraulic device (30,32,34,36), master control means (42) and means coupling said master control means (42) to all of said device control means (30B, 32B,34B,36B) for coordinating operation of said device control means and said hydraulic devices controlled thereby, wherein said coupling means comprises a bus means (44) common at all of said master (42) and device control means (30B,32B,34B,36B), and wherein all of said device control means (30B,32B,34B,36B) are constructed for connection to said common bus means (44) for individual communication with said master control means (42).
Claim 2
Dependent Claim
142 words
An electrohydraulic system with distributed control comprising a plurality of electrohydraulic devices (30,32,34,36) responsive to electronic control signals for performing hydraulic operations and control means for providing said control signals, said control means including a plurality of individual device control means (30B,32B,34B, 36B) each associated with and dedicated to directly controlling operation at an associated hydraulic device (30,32,34,36), master control means (42) and means coupling said master control means (42) to all of said device control means (30B, 32B,34B,36B) for coordinating operation of said device control means and said hydraulic devices controlled thereby, wherein said coupling means comprises a bus means (44) common at all of said master (42) and device control means (30B,32B,34B,36B), and wherein all of said device control means (30B,32B,34B,36B) are constructed for connection to said common bus means (44) for individual communication with said master control means (42).
Claim 3
Dependent Claim
64 words
The system set forth in claim 1 characterized in that each of said device control means includes means (82,88) for establishing a communication address unique from addresses of all other device control means {30B,32B,34B,36B) connected to said bus means (44), said master control means (42) including means (62,64) for communicating with said device control means (30B,32B,34B,36B) individually as a function of associated device addresses.
Claim 4
Dependent Claim
40 words
The system set forth in claim 2 wherein said bus means (44) comprises a serial data bus, and wherein each of master and device control means (42,30B,32B,34B,36B) includes means (66,72,86) for transmitting and receiving data on said bus means (44).
Claim 5
Dependent Claim
90 words
The system set forth in claim 3 wherein each of said master and device control means (42,30B,32B,34B,36B) includes separate transmission and reception ports (TXD,RXD), and wherein said bus means (44) includes first means (ST) connecting said transmission port (TXD) at said master control means (42) in common to said reception ports (RXD) at all of said device control means (30B,32B,34B,36B), and second means (RT) connecting said transmission ports (TXD) at all of said device control means (30B,32B,34B,36B) in common to said reception port (RXD) at said master control means (42).
Claim 6
Dependent Claim
66 words
The system set forth in claim 2,3 or 4 further comprising means (68) for applying electrical power to at least one conductor of said bus means (44), and wherein each of said device control means (30B,32B,34B,36B) includes means for connection to said at least one conductor for receiving electrical power therefrom, electrical power at said device control means being obtained solely from said bus means (44).
Claim 7
Dependent Claim
88 words
The system set forth in claim 1 wherein said master control means (42) includes means (50,62,64) for establishing a repetitive time sequence of communication windows and means (70,74,82) for communicating with each of said device control means in turn during an associated said window, and wherein each said device control means (30B, 32B,34B,36B) includes means (82) for communicating with said master control means (42) only during an associated said window, and means (76,30C,32C,34C) for performing control operations at the associated said device other than during said associated window.
Claim 8
Dependent Claim
20 words
The system set forth in claim 6 wherein each window in said repetitive time sequence is of fixed time duration.
Claim 9
Dependent Claim
17 words
The system set forth in claim 1 wherein one of said hydraulic devices comprises an hydraulic pump
Claim 10
Dependent Claim
56 words
(36), wherein said master control means (42) includes means for establishing a maximum load at said pump, and wherein said device control means includes a pump controller (36B) couples to said pump (36) and responsive to maximum load signals from said master control means (42) for limiting operation at said pump (36) to said maximum load.
Claim 11
Dependent Claim
56 words
(36), wherein said master control means (42) includes means for establishing a maximum load at said pump, and wherein said device control means includes a pump controller (36B) couples to said pump (36) and responsive to maximum load signals from said master control means (42) for limiting operation at said pump (36) to said maximum load.
Claim 12
Dependent Claim
133 words
The system set forth in claim 8 wherein said pump comprises variable displacement pump (36), and wherein said pump controller (36B) includes means for receiving a flow command signal (Q c ) and a speed limit command signal (N L ) from said master controller (42), means (84) for receiving a signal (N) indicative of actual speed at said pump, means responsive to said flow command signal (Q c ) and to said speed-indicating signal (N) for determining pump displacement necessary (Dcf) to satisfy said flow command signal, means responsive to said speed limit command signal (N L ) and to said speed-indicating signal (N) for determining available pump displacement (Dcn), and means for controlling displacement at said pump as a function of the lesser of said necessary displacement and said available displacement.
Claim 13
Dependent Claim
89 words
The system set forth in any of claim 1 to 9, characterized in that said master control means (42) includes a signal input port, in that each of said device control means (30B,32B,34B,36B) includes a signal output port and means (78, 80,98,120) for applying signals to said device output port as a function of operation of the associated said device (30,32, 34,36), and in that said bus means (44) further comprises a second signal bus connecting all of said device output ports in common to said master input port.
Claim 14
Dependent Claim
65 words
The system set forth in claim 10,11 or 12 wherein said bus means (44) further comprises a third bus and means (68) for applying electrical power to said third bus, and wherein each of said device control means (30B,32B,34B,36B) includes means for connection to said third bus for receiving electrical power therefrom, electrical power at said device control means being obtained solely from said buses.
Claim 15
Independent Claim
29 words
The system set forth in any of claims 1 to 11 comprising a master microprocessor (50), which is controlled for system timing by program as contained in appendix A.
Claim 16
Dependent Claim
29 words
The system set forth in any of claim 1 to 11, comprising a master microprocessor (50), which is controlled for serial communication by program as contained in appendix B.
Claim 17
Independent Claim
28 words
The system set forth in any of claims 1 to 11, comprising device microprocessors (70,84) which are controlled for serial communication by program as contained in appendix C.
References Cited (Backward Citations)
No citation records indexed.
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