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US 2016/0097334 A1Published application
Method and system for engine air control
AssigneeFord Global Technologies, LLC
InventorsChris Paul Glugla, Michael Damian Czekala
Life of this patent
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Abstract
Methods and systems are provided for reducing idling torque imbalances between cylinders by actuating a common camshaft to which the cylinders are coupled. The camshaft may be adjusted within camshaft limits during each combustion event of each cylinder. In this way, idling NVH issues may be addressed.
Claims19
A method for adjusting valve timing of an engine, comprising:
- compressing intake air with a compression device, the amount of compression provided to one or more cylinders of the engine varied by a controller;
- operating intake valves of two or more cylinders via a camshaft;
- and
- adjusting, with the controller, the camshaft based on a camshaft limit during engine idle conditions for each combustion event of the two or more cylinders via a hydraulically operated actuator.
1 more element
A method for an engine, comprising:
- during engine idle conditions,
- adjusting a camshaft position of an electrically actuated cam phaser during each combustion event of a first and a second cylinder coupled to a camshaft, the adjusting based on an engine cycle-specific torque variation between the first and second cylinder, an intake valve of the first and second cylinders operated via the camshaft.
An engine system, comprising:
- a direct injection engine including a first and a second cylinder;
- a turbocharger coupled to the engine;
- a camshaft coupled to the first and second cylinder, the camshaft actuated to operate an intake valve of the first and second cylinder;
- and
- a controller with computer readable instructions for,
- during engine idle conditions,
- estimating a torque variation between the first and second cylinder;
- and
- at each engine cycle and for a given engine torque output, adjusting the camshaft to a first position at a first combustion event of the first cylinder and to a second, different position at a second combustion event of the second cylinder to reduce the torque variation, the first and second positions based on each of an engine speed, a firing order of the first and second cylinder, a camshaft limit, and the estimated torque variation.
6 more elements
Dependencies are inferred from the claim text.