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Clogged filter detection system and method

  • US 9,429,275 B2
  • Filed: 01/07/2013
  • Issued: 08/30/2016
  • Est. Priority Date: 03/11/2011
  • Status: Active Grant
First Claim
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1. A hydraulic system for a hybrid vehicle, the hybrid vehicle including a motor, said hydraulic system comprising:

  • a sump with a supply of hydraulic fluid;

    a network of valves and conduits;

    pump means for drawing hydraulic fluid from said sump and delivery of said hydraulic fluid to said network;

    a fluid filter positioned in said network;

    a control valve positioned in said network downstream from said fluid filter;

    a primary output conduit connected to said control valve for supplying hydraulic fluid to a primary demand;

    a secondary output conduit connected to said control valve for supplying hydraulic fluid to a secondary demand, wherein said control valve is constructed and arranged to supply hydraulic fluid to said secondary demand only after said primary demand is satisfied; and

    temperature monitoring means for monitoring an internal temperature of said motor and for determining if the fluid flow out of said fluid filter satisfies said primary demand.

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