Boots – shoes – and leggings
Patent
1996-10-03
1999-03-16
Ruggiero, Joseph
Boots, shoes, and leggings
395287, G06F 1900, G06F 1300
Patent
active
058838007
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention can be used for hydraulic components intended to be used as building elements for mobile hydraulic equipment. As examples of hydraulic components, mention can be made of hydraulic valves, control levers, hydraulic cylinders, hydraulic motors etc. In one exemplary embodiment, a hydraulic valve is controlled with a control lever equipment and the valve effects oil flow or oil pressure depending on the control. Such control systems can be included in forest machinery in which the hydraulics can be used for timber loading, control etc. Other examples are mining machinery, and various types of other loading machines, e.g. trucks with buckets, pallet lifters etc. Further examples are working baskets, lifting machines, agricultural machinery, and mining equipment etc.
In the equipment user is made of the standardized CAN system (Controller Area Network) as a control and monitoring system. The CAN system includes a number of nodes or modules which can communicate with one another via a two-wire or a several wire bus connection in the control and monitoring system, which is characterized by series communication on the bus communication. The module can comprise master and slave modules. Reference is also made, quite generally, to inter alia said standard with the designation ISO 11898.
BACKGROUND OF THE INVENTION
State of The Art
It is already known to use the CAN system in connection with vehicles and mobile equipment. From the publication dated 30-03-1994 from Honeywell Micro Switch Division, it is known to provide a special program in the system in order, after restarting in the system, to make the various modules work with a bit speed fixed by or in the system. Among other things, a special NOOP message is transmitted on the bus connection upon restarting. A special elimination bit in this connection is initiated in a control register in the system, which causes the transmitter in question to terminate its message, irrespective of whether acknowledgement is received or not. The master module must subsequently check whether there is a NOOP acknowledgement on the connection. If no such acknowledgement appears on the connection, the master module repeats the check. If the acknowledgement exists, the module takes this as confirmation that the connection is in operation, whereupon other nodes can adjust themselves to the correct bit speed or corresponding parameters.
It is possible, in a conventional manner, to prevent the CAN circuit from carrying out transmission on the bus connection in association with the restarting. This can take place, e.g., by the output in question from the CAN circuit being programmed to make this possible. In this manner, the CAN circuit can be made to listen to the bus without the CAN circuit transmitting an error message or acknowledgement bit on the bus connection in question. When the CAN circuit receives a message, this takes place at a bit speed which can be set with certain parameters and which can be adjusted to make possible reception of the bit speed applicable in the system. In this manner, the CAN circuit can communicate on the connection without disrupting or corrupting the communication on the connection by working with incorrect parameters/bit speed. It is to be noted in this case that the rules of the CAN system state that one priority field in the CAN system may not be used by two modules simultaneously. In order to avoid an error message if two or more modules are transmitting simultaneously, this must be counteracted with the aid of rules in the software and programs of the CAN system (cf. above).
SUMMARY OF THE INVENTION
Each special arrangement in the system programming complicates the system and its application. There is a need to utilize the basic principles for the CAN system and to make these work in situations which were not presupposed from the outset by the original system builders of the CAN system. The invention solves this problem, among others, and proposes that the modules or the nodes themselves are made to appear exact
REFERENCES:
patent: 4468738 (1984-08-01), Hansen et al.
patent: 5246039 (1993-09-01), Frediksson
patent: 5323324 (1994-06-01), Fredriksson
patent: 5446846 (1995-08-01), Lennartsson
Uusljarvi et al., Introducing Distribution Control In Mobile Machines Based On Hydraulic Actuators, Mechatronics, vol. 4, No. 2, pp. 139-157, 1994.
Parker Hannifin AB
Ruggiero Joseph
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