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Engine operation for plug-in hybrid electric vehicle

  • US 9,415,762 B2
  • Filed: 04/05/2012
  • Issued: 08/16/2016
  • Est. Priority Date: 04/05/2012
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • propelling a vehicle with an engine and a motor;

    a first and second charge threshold, the first charge threshold greater than the second charge threshold, andstarting the engine if energy stored in an energy storage device is greater than the first charge threshold when a contaminant amount in engine oil is greater than a contaminant threshold amount, whereinthe contaminant amount is determined based on a number of counted engine starts where engine temperature is less than a temperature threshold, engine stops where engine temperature is less than the temperature threshold, and engine on time.

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