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US 8,751,122 B2Granted
Method for checking an emergency condition in a transmission system
AssigneeZF Friedrichshafen AG
InventorsJorg Arnold, Michael Sohler, Klaus Steinhauser, Thilo Schmidt
Life of this patent
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Abstract
A method of monitoring an emergency condition in an automatic transmission, with which, by comparing a theoretical with an actual rotational speed, measured on the transmission input side, overlap of the activated emergency condition, with a gear engagement process called for during the normal condition, is prevented.
Claims12
A method of monitoring an emergency condition in an automatic transmission, the method comprising the steps of:
- comparing a theoretical and an actual rotational speed that is measured on a transmission input side, and
- preventing an overlap of the activated emergency condition, with a gear engagement process called for during normal condition, depending on the comparison.
A method of detecting an emergency condition in an automatic transmission of a vehicle, the method comprising the steps of:
- monitoring actual turbine rotational speeds of a torque converter on an input side of the automatic transmission;
- comparing the actual turbine rotational speed of the torque converter with stored theoretical turbine rotational speeds of the torque converter;
- recognizing a fault condition when the actual turbine rotational speed of the torque converter deviates from the stored theoretical turbine rotational speeds of the torque converter;
- and
- preventing an overlap of emergency operation of the automatic transmission and a gear engagement process, during normal operation of the automatic transmission, when the fault condition is recognized.
2 more elements
Dependencies are inferred from the claim text.