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Turbocharger compressor diagnostic system

  • US 6,298,718 B1
  • Filed: 03/08/2000
  • Issued: 10/09/2001
  • Est. Priority Date: 03/08/2000
  • Status: Expired due to Term
First Claim
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1. For a turbocharged engine having an engine control module operable to control engine operation in response to data received from a plurality of sensors, a method for diagnosing abnormal turbocharger compressor operation, comprising the steps of:

  • storing, in a memory, data corresponding to a compressor operation map defining a region of normal compressor operation between a surge line and a choke line, a surge region outside the surge line and a choke region outside the choke line, the surge line and choke line being defined according to a predetermined relationship between a first and a second compressor operating parameter;

    conducting a rationality test on the data received from selected ones of the plurality of sensors and generating an error signal if one or more of the selected sensors fails the rationality test;

    if all sensors pass the rationality test, generating actual values for the first and second operating parameters from the sensor data; and

    comparing the actual values with the compressor operation map and generating an abnormal operation signal if the actual values fall outside a predetermined relationship with the choke line or the surge line.

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