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System and method for detecting and responding to pressure losses in a hydraulic automatic transmission

  • US 8,543,279 B2
  • Filed: 03/24/2010
  • Issued: 09/24/2013
  • Est. Priority Date: 11/10/2009
  • Status: Expired due to Fees
First Claim
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1. A control system for a hydraulic automatic transmission, comprising:

  • a fault detection module that detects a plurality of faults associated with the transmission; and

    a transmission diagnostic module that, in response to detecting at least one of the plurality of faults;

    determines whether a number of the plurality of faults is greater than a predetermined number of faults;

    diagnoses a low hydraulic fluid pressure of the transmission if the number of the plurality of faults is greater than the predetermined number of faults;

    diagnoses a fault in at least one valve of the transmission if the number of the plurality of faults is not greater than the predetermined number of faults; and

    generates an indication based on whether the low hydraulic fluid pressureor the fault in the at least one valve is diagnosed.

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