Transmission control default operation
AssigneeCaterpillar Inc.
InventorsRandall M. Mitchell, Ashok Kajjam, Alan L. Stahl
Life of this patent
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Abstract
A diagnostic system is provided for responding to a fault condition in a transmission having an electronic control including diagnostics for both electrical and mechanical failures, said diagnostics indicating the affected clutch and the type of failure. The diagnostic system includes a processor for selecting a first table of available gears in response to the affected clutch and a first subset of electrical and mechanical failure types being diagnosed and for selecting a second table of available gears in response to the affected clutch and a second subset of electrical and mechanical failure types being diagnosed.
Claims19
An apparatus for responding to a fault condition in a transmission having an electronic control including diagnostics for both electrical and mechanical failures, said diagnostics indicating the affected clutch and the type of failure, comprising:
- means for selecting a first group of available gears in response to the affected clutch and a first subset of failure types being diagnosed;
- means for selecting a second group of available gears in response to the affected clutch and a second subset of failure types being diagnosed;
- and
- means for providing one of said first and second groups of available gears for control of the transmission.
An apparatus for responding to a fault condition in a transmission having an electronic control including diagnostics for both electrical and mechanical failures, said diagnostics indicating the affected clutch and the type of failure, comprising:
- means for receiving one or more diagnostic signals and a selected gear signal;
- means for determining whether the selected gear is available in response to said one or more diagnostic signals;
- means for maintaining operation of said transmission in response to the selected gear being available;
- and
- means for deactivating all clutch control solenoids in response to the selected gear being unavailable.
A method for responding to a fault condition in a transmission having an electronic control including diagnostics for both electrical and mechanical failures, said diagnostics indicating the affected clutch and the type of failure, comprising the steps of:
- selecting a first group of available gears in response to the affected clutch and a first subset of failure types being diagnosed;
- selecting a second group of available gears in response to the affected clutch and a second subset of failure types being diagnosed;
- and
- providing one of said first and second groups of available gears for control of the transmission.
A method for responding to a fault condition in a transmission having an electronic control including diagnostics for both electrical and mechanical failures, said diagnostics indicating the affected clutch and the type of failure, comprising the steps of:
- receiving one or more diagnostic signals and a selected gear signal;
- determining whether the selected gear is available in response to said one or more diagnostic signals;
- maintaining operation of said transmission in response to the selected gear being available;
- and
- deactivating all clutch control solenoids in response to the selected gear being unavailable.
Dependencies are inferred from the claim text.