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Power management system for street sweeper

  • US 6,959,466 B2
  • Filed: 09/06/2002
  • Issued: 11/01/2005
  • Est. Priority Date: 09/06/2002
  • Status: Expired due to Fees
First Claim
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1. A street sweeper comprising:

  • a variable speed engine;

    an engine speed sensor coupled to the engine for providing engine speed information to a control unit;

    a hydraulic pump operatively coupled to the engine;

    a sweeping mechanism powered by the hydraulic pump and including a main pickup brush and a debris conveyer;

    a vacuum system including a vacuum fan motor powered by the hydraulic pump, said vacuum system for creating an airflow within the street sweeper;

    an electric proportional valve coupled between the hydraulic pump and the vacuum fan motor, said valve for selectively restricting a flow rate of hydraulic fluid to the vacuum fan motor; and

    the control unit operatively coupled to the engine speed sensor and the proportional valve, said control unit receiving the engine speed information from the engine speed sensor and communicating a control signal to the proportional valve to control the flow rate of hydraulic fluid to the vacuum fan motor as a function of engine speed.

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