Methods and system for improving response of a hybrid vehicle
AssigneeFord Global Technologies, LLC
InventorsJeffrey Allen Doering, Gregory Patrick McConville, Chris Paul Glugla
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Abstract
Systems and methods for operating a driveline of a hybrid vehicle are disclosed. In one example, an engine may enter or stay in one of two cylinder modes in response to a request to a negative torque capacity of an electric machine being insufficient to provide a desired driveline braking torque. One cylinder mode operates cylinders with cylinder valves held closed and without fuel being injected to the cylinders while the other cylinder mode operates cylinders with valves that open and close without fuel being injected to the cylinders.
Claims16
A driveline operating method, comprising:
- ceasing fuel delivery to all engine cylinders and adjusting an actual total number of engine cylinders with operating poppet valves and an actual total number of engine cylinders with deactivated poppet valves in response to a driveline braking torque during vehicle deceleration via a controller;
- and
- ceasing to rotate an engine in response to a vehicle in which the engine operates not being in a sport mode and an electric machine having torque capacity to provide the driveline braking torque.
A driveline operating method, comprising:
- rotating an engine and holding poppet valves of a cylinder of the engine closed over a first engine cycle in response to a vehicle operating in a sport mode and an electric machine having torque capacity to provide a driveline braking torque;
- and
- stopping engine rotation in response to the vehicle not operating in the sport mode and the electric machine having torque capacity to provide the driveline braking torque.
A driveline operating method, comprising:
- ceasing fuel delivery to all engine cylinders and adjusting an actual total number of engine cylinders with operating poppet valves and an actual total number of engine cylinders with deactivated poppet valves in response to a driveline braking torque during vehicle deceleration via a controller;
- rotating an engine in response to the driveline braking torque;
- and
- starting the engine to rotate the engine in response to the driveline braking torque and a lack of negative torque capacity of an electric machine to provide the driveline braking torque.
Dependencies are inferred from the claim text.