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.
Claims20
A driveline operating method, comprising:
- ceasing fuel delivery to all engine cylinders and adjusting an actual total number of cylinders of an engine with operating poppet valves and an actual total number of cylinders of the engine with deactivated poppet valves in response to a desired driveline braking torque during vehicle deceleration via a controller.
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 desired 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 desired driveline braking torque.
A system, comprising:
- an engine;
- an electric machine coupled to the engine;
- a transmission coupled to the electric machine;
- and
- a vehicle system controller including executable instructions stored in non-transitory memory to operate engine cylinders with opening and closing valves and without fuel in response to a torque capacity of the electric machine being less than a desired driveline braking torque, and instructions stored in non-transitory memory to operate engine cylinders with closed valves over a plurality of engine cycles and without fuel in response to the torque capacity of the electric machine being greater than the desired driveline braking torque.
Dependencies are inferred from the claim text.