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US 10,882,525 B2Granted
Cylinder deactivation control for driveline braking
AssigneeFord Global Technologies, LLC
InventorChris Paul Glugla
Life of this patent
Estimating the term…
Abstract
Systems and methods for operating an engine with deactivating and non-deactivating valves are presented. In one example, an actual total number of deactivated cylinders may be adjusted to control driveline braking. The driveline braking may be controlled in a towing mode, a hill descent mode, and during normal driving conditions.
Claims10
A vehicle operating method, comprising:
- in a non-hill descent mode, operating a first actual total number of cylinders with cylinder poppet valves remaining in closed positions over an engine cycle in response to a desired engine brake torque, and operating a second actual total number of cylinders with cylinder poppet valves opening and closing over the engine cycle in response to the desired engine brake torque, cylinders included in the first actual total number of cylinders and cylinders in the second actual total number of cylinders not combusting air and fuel;
- and
- in a hill descent mode, shifting a transmission to a lower gear and operating a third actual total number of cylinders with cylinder poppet valves remaining in closed positions over the engine cycle in response to the desired engine brake torque, and operating a fourth actual total number of cylinders with cylinder poppet valves opening and closing over the engine cycle in response to the desired engine brake torque, cylinders in the third actual total number of cylinders and cylinders included in the fourth actual total number of cylinders not combusting air and fuel.
A vehicle system, comprising:
- an engine including one or more cylinder poppet valves that may be deactivated;
- and
- a controller including non-transitory executable instructions, which when executed by the controller operate a first group of cylinders with cylinder poppet valves opening and closing during an engine cycle, and operating a second group of cylinders with poppet valves held closed during the engine cycle, cylinders in the first and second groups of cylinders not combusting air and fuel, an actual total number of cylinders in the group of cylinders based on barometric pressure and vehicle operating mode, and increasing an actual total number of cylinders in the second group of cylinders in response to a request to operate in an economy mode.
Dependencies are inferred from the claim text.