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US 9,868,346 B2Granted
Method for operating a hybrid drive system for a motor vehicle and a hybrid drive device
AssigneeAudi AG
InventorAndreas Petz
Life of this patent
Estimating the term…
Abstract
In a method for operating a hybrid drive device of a motor vehicle, a speed ratio between an electric machine of the hybrid drive device and an output shaft of the hybrid drive device is reduced by a transmission, when a temperature of the electric machine exceeds a first temperature limit value.
Claims16
A method for operating a hybrid drive device of a motor vehicle, comprising:
- reducing a speed ratio between an electric machine of the hybrid drive device and an output shaft of the hybrid drive device by a transmission, when a temperature of the electric machine exceeds a first temperature limit value;
- and
- operating the electric machine during normal operation of the hybrid drive device in one of three ways, a first way in which the electric machine is operated in a driving mode, a second way in which the electric machine is operated in a generator mode, and a third way in which the electric machine is operated in an idle mode, and switching the electric machine to a safety mode in which the electric machine is permitted to operate only in the idle mode, when the temperature exceeds a second temperature limit value.
A hybrid drive device for a motor vehicle, comprising:
- an output shaft;
- an engine;
- an electric machine;
- and
- a transmission configured to operatively connect the engine and the electric machine to the output shaft during travel of the motor vehicle and to reduce a speed ratio between the electric machine and the output shaft, when a temperature of the electric machine exceeds a first temperature limit value, wherein the electric machine is configured for operation during normal operation of the hybrid drive device in one of three ways, a first way in which the electric machine is operated in a driving mode, a second way in which the electric machine is operated in a generator mode, and a third way in which the electric machine is operated in an idle mode, said electric machine being switched to a safety mode in which the electric machine is permitted to operate only in the idle mode, when the temperature exceeds a second temperature limit value.
2 more elements
Dependencies are inferred from the claim text.