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STEERING SYSTEM FOR ARTICULATED VEHICLES

  • US 3,795,285 A
  • Filed: 04/03/1972
  • Issued: 03/05/1974
  • Est. Priority Date: 04/03/1972
  • Status: Expired due to Term
First Claim
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1. A steering system for a vehicle having an articulated body with front and rear body sections coupled together by pivot means providing for articulation of said vehicle about a vertical axis of said pivot means, comprising a source of pressurized fluid, at least one fluid motor coupled between said front and rear body sections of said vehicle for forcing articulation about said pivot axis, an electrically controlled valve means connected between said fluid source and said motor for actuating said motor to articulate said vehicle about said axis, a manually manipulatable operator'"'"''"'"'s steering control, command signal generating means coupled to said operator'"'"''"'"'s steering control for producing an electrical command signal indicative of movement of said steering control, actual articulation signal generating means coupled between said front and rear body sections of said vehicle for producing an electrical signal indicative of the actual articulation of said vehicle, circuit means connected between said command signal generating means and said valve means for causing said valve means to actuate said motor in response to movement of said operator'"'"''"'"'s steering control and having, comparison circuit means connected between said command signal generating means and said actual articulation signal generating means and said electrically controlled means for transmitting an electrical actuating signal to said valve when said command signal differs from said actual articulation signal, and phase shifting means coupled to the feedback path defined by said actual articulation signal generating means and said comparison circuit means for establishing a predetermined phase lag therethough to inhibit fluid mass resonance effects in said steering system.

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