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Diagnostic systems for turbocharged engines

  • US 6,785,604 B2
  • Filed: 05/15/2002
  • Issued: 08/31/2004
  • Est. Priority Date: 05/15/2002
  • Status: Expired due to Fees
First Claim
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1. A method for diagnosing operation in a turbocharged engine having an engine control module (ECM) operable to control engine operation in response to data received from a plurality of sensors, the method comprising:

  • storing in a memory data corresponding to;

    a compressor map defining a region of compressor efficiency and compressor speeds during operation; and

    a turbine map defining a region of turbine efficiency and turbine speeds during operation;

    determining a predicted value for an operating parameter measured by a first hardware sensor using data received from at least a second hardware sensor and the at least one of the compressor map and the turbine map;

    determining an actual value for the operating parameter using data received from the first hardware sensor;

    generating an abnormal operation signal if a difference between actual and predicted values exceeds a predetermined amount;

    disabling the first hardware sensor if the difference between the actual and predicted values has exceeded the predetermined amount; and

    controlling operation of an engine based on the predicted value.

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