Method for diagnosing a failure of an output shaft speed sensor of an automatic transmission for a vehicle
AssigneeHyundai Motor Company
InventorHyuk-Bin Kwon
Life of this patent
Estimating the term…
Abstract
A method and apparatus for diagnosing a failure of an output shaft speed sensor of an automatic transmission is provided, which comprises: determining whether a current transmission is a forward driving range; determining whether a failure criterion exists based on a current gear, an input shaft speed, an output shaft speed, and an engine speed, if the current transmission is the forward driving range; and maintaining the current gear if a downshift criterion exists, or upshifting a gear if a upshift criterion exists, if the failure criterion exists.
Claims31
A method for diagnosing a failure of an output shaft speed sensor of an automatic transmission, comprising:
- determining whether the transmission is in a forward gear;
- determining whether a failure criterion exists based on at least one of a current gear, an input shaft speed, an output shaft speed, or an engine speed, if the transmission is in a forward gear;
- and
- maintaining the current gear if a downshift criterion exists, or upshifting a gear if an upshift criterion exists, if the failure criterion exists.
A system for diagnosing a failure of an output shaft speed sensor of an automatic transmission, comprising:
- an inhibitor switch for detecting what gear the transmission is in;
- an input shaft speed sensor detecting a turbine shaft speed and generating a corresponding signal;
- an output shaft speed sensor detecting an output shaft speed and generating a corresponding signal;
- an engine speed sensor detecting an engine speed and generating a corresponding signal;
- and
- a control unit programmed to execute instructions comprising:
- determining whether the transmission is in a forward gear;
- determining whether a failure criterion exists based on a current gear, an input shaft speed, an output shaft speed, and an engine speed, if the transmission is in a forward gear;
- and
- maintaining the current gear if a downshift criterion exists, or upshifting a gear if a upshift criterion exists, if the failure criterion exists.
A method for diagnosing a failure of an output shaft speed sensor of an automatic transmission, comprising:
- determining whether the transmission is in a forward gear;
- determining whether a failure criterion exists based on the forward gear, an input shaft speed, and an output shaft speed;
- and
- determining that the output shaft speed sensor has failed based on the failure criterion existing.
Dependencies are inferred from the claim text.