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Method and apparatus for monitoring a transmission range selector in a hybrid powertrain transmission

  • US 8,209,098 B2
  • Filed: 10/06/2008
  • Issued: 06/26/2012
  • Est. Priority Date: 10/29/2007
  • Status: Active Grant
First Claim
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1. Method to monitor integrity of a signal output from an operator-manipulable transmission range selector for a powertrain system wherein a control module performs the following steps, comprising:

  • determining a range state corresponding to a signal from a range encoder attached to the transmission range selector and determining a direction state corresponding to a signal from a direction encoder attached to the transmission range selector, wherein the range state directly corresponds to a discrete position of the transmission range selector and wherein the direction state corresponds to rotational direction of an output member of the powertrain system;

    determining the discrete position of the transmission range selector based upon the range state and the direction state; and

    performing back rationality to verify the discrete position of the transmission range selector.

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