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Power transmission

  • US 4,744,218 A
  • Filed: 04/08/1986
  • Issued: 05/17/1988
  • Est. Priority Date: 04/08/1986
  • Status: Expired due to Term
First Claim
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1. An electrohydraulic system with distributed control comprisinga plurality of electrohydraulic devices 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 each associated with and dedicated to directly controlling operation at an associated hydraulic device, master control means and means coupling said master control means to all of said device control means for coordinating operation of said device control means and said hydraulic devices controlled thereby,said coupling means comprising a bus common to all of said master and device control means, all of said device control means being constructed for connection to said common bus for individual communication with said master control means,said bus comprising a serial data bus, and each of master and device control means including means for transmitting and receiving data on said bus,said master control means including means for establishing a repetitive time sequence of communication windows and means for communicating with each of said device control means in turn during an associated said window, each said device control means including means for communicating with said master control means only during an associated said window, and means for performing control operation at the associated said device other than during said associated window,each said master and device control means including memory means, means for receiving both address and data information, and means for storing said data information at locations in said memory means indicated by said address information.

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