Method for reducing the thermal load on an automatic transmission for a motor vehicle in emergency operating mode
AssigneeZF Batavia, L.L.C.
InventorsArmin Gierling, Hans-Dieter Hengstler, Helmut Hofstätter
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Abstract
In an automatic transmission for a motor vehicle which is controlled by an electronic transmission control device which continuously exchanges signals with a digital engine electronic system of an internal combustion engine, to reduce the thermal load on the automatic transmission in emergency operating mode, a transmission-independent program module (M1) of the digital engine electronics system presets an admissible maximum engine torque for the emergency operating mode (M_mot_max_not).
Claims18
A method for reducing the thermal load of an automatic transmission for a motor vehicle in an emergency operating mode wherein the automatic transmission is controlled by an electronic transmission control device which continuously exchanges signals with a digital engine electronics system of an internal combustion engine, comprising the steps of:
- monitoring a signal of the electronic transmission control device and the engine electronics system that indicates when the engine and transmission are operating normally, and
- when the signal indicates that one of the engine and transmission are not operating normally, initiating operation in an emergency mode,
- initiating an emergency operation mode of the digital engine electronics system, and
- in the emergency operation mode and from an emergency program module of the digital engine electronics system and independently from the electronic transmission control device and from a transmission-independent program module, generating a preset signal setting an admissible maximum engine torque for the emergency operating mode (M_mot_max_not).
Dependencies are inferred from the claim text.