System and method for detecting and responding to pressure losses in a hydraulic automatic transmission
AssigneeGM Global Technology Operations LLC
InventorsScott E. Mundy, Jill Ann Hampton
Life of this patent
Estimating the term…
Abstract
A control system for a hydraulic automatic transmission includes a fault detection module and a transmission diagnostic module. The fault detection module detects faults of components of the transmission, wherein the faults may indicate low hydraulic fluid pressure in the transmission or failure of one or more of the components. The transmission diagnostic module determines whether the faults are due to low hydraulic pressure based on the detected faults, a predetermined number of faults, and a plurality of conditions.
Claims28
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 pressure
- or the fault in the at least one valve is diagnosed.
A method for controlling a hydraulic automatic transmission, comprising:
- detecting, using a processor, a plurality of faults associated with the transmission;
- and
- in response to detecting at least one fault of the plurality of faults:
- determining, using a processor, whether a number of the plurality of faults is greater than a predetermined number of faults;
- diagnosing, using a processor, a low hydraulic fluid pressure of the transmission if the number of the plurality of faults is greater than the predetermined number of faults;
- diagnosing, using a processor, a fault in at least on valve of the transmission if the number of the plurality of faults is not greater than the predetermined number of faults;
- and
- generating, using a processor, an indication based on whether the low hydraulic fluid pressure or the fault in the at least one valve is diagnosed.
Dependencies are inferred from the claim text.