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US 9,174,633 B2Granted
Methods and systems providing driveline braking
AssigneeFord Global Technologies, LLC
InventorsSeung-Hoon Lee, Gregory Michael Pietron, Jeffrey Allen Doering, Alex O'Connor Gibson, Dennis Craig Reed
Life of this patent
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Abstract
Systems and methods for improving operation of a hybrid vehicle are presented. In one example, driveline braking may transition from regenerative braking to engine braking to reduce the possibility of battery degradation.
Claims13
A method for controlling driveline braking in a hybrid vehicle, comprising:
- providing driveline braking via a first electric machine while rotation of an engine internal combustion is stopped;
- and
- starting rotation of the engine after the engine is stopped in response to a battery state of charge exceeding a threshold that is indicative of a fully charged battery, where the starting of rotation of the engine is performed via a second electric machine.
A vehicle system, comprising:
- an internal combustion engine;
- a dual mass flywheel (DMF) including a first side mechanically coupled to the engine;
- a driveline disconnect clutch mechanically including a first side coupled to a second side of the DMF;
- a driveline integrated starter/generator (DISG) including a first side coupled to a second side of the driveline disconnect clutch;
- a starter other than the DISG including a base state where the starter is not engaged to the engine;
- a transmission selectively coupled to the engine via the driveline disconnect clutch;
- and
- a controller including non-transitory instructions executable to automatically stop the engine, provide driveline braking via the DISG while engine rotation is stopped, and rotate a stopped engine via the starter other than the DISG when the DISG is providing driveline braking and when battery state of charge is greater than a threshold level that is indicative of a fully charged battery.
5 more elements
Dependencies are inferred from the claim text.