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State of charge catalyst heating strategy

  • US 9,410,458 B2
  • Filed: 10/01/2009
  • Issued: 08/09/2016
  • Est. Priority Date: 10/01/2009
  • Status: Active Grant
First Claim
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1. An engine system, comprising:

  • a heater for heating a catalytic converter in an exhaust system of a vehicle;

    a first electronic circuit configured to receive a parameter associated with a battery in said vehicle and determines a state of charge of said battery based on said parameter; and

    a second electronic circuit configured to;

    activate said heater when said state of charge is less than a first state of charge threshold; and

    determine said first state of charge threshold based on a volume of said catalytic converter and a measured temperature of an engine in said vehicle, wherein said measured temperature is measured during operation of said vehicle when said engine is off and an electric motor in said vehicle is being used to produce drive torque; and

    a third electronic circuit configured to start said engine when said state of charge is less than a second state of charge threshold and said measured temperature of said engine is less than an operating temperature, wherein said second electronic circuit determines at least one of said first and second state of charge thresholds such that sufficient power is available to increase a temperature of said catalytic converter to an activation temperature using said heater and to continue to activate said heater while said measured temperature of said engine is less than said operating temperature.

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