Multi-level skip fire
First Claim
Patent Images
1. A method of controlling the operation of an internal combustion engine having a plurality of working chambers to deliver a desired output, wherein each working chamber has at least one intake valve that is cam-actuated and at least one exhaust valve, the method comprising:
- operating the engine in a skip fire manner that skips selected skipped working cycles and fires selected active working cycles to deliver a desired engine output, wherein decisions whether to fire or skip each working cycle are dynamically determined during operation of the engine on a firing opportunity by firing opportunity basis; and
selecting a high or low torque output on the fired working chambers wherein decisions whether to use a high or low torque output are dynamically determined during operation of the engine on a firing opportunity by firing opportunity basis; and
adjusting air charge for the fired working chambers based on whether the high or low torque output was selected on the fired working chambers.
1 Assignment
0 Petitions
Accused Products
Abstract
In one aspect, a method for controlling operation of an internal combustion engine is described. The engine is operated in a skip fire manner such that selected skipped working cycles are skipped and selected active working cycles are fired to deliver a desired engine output. A particular level of torque output is selected for each of the fired working chambers. Various methods, arrangements and systems related to the above method are also described.
-
Citations
27 Claims
-
1. A method of controlling the operation of an internal combustion engine having a plurality of working chambers to deliver a desired output, wherein each working chamber has at least one intake valve that is cam-actuated and at least one exhaust valve, the method comprising:
-
operating the engine in a skip fire manner that skips selected skipped working cycles and fires selected active working cycles to deliver a desired engine output, wherein decisions whether to fire or skip each working cycle are dynamically determined during operation of the engine on a firing opportunity by firing opportunity basis; and selecting a high or low torque output on the fired working chambers wherein decisions whether to use a high or low torque output are dynamically determined during operation of the engine on a firing opportunity by firing opportunity basis; and adjusting air charge for the fired working chambers based on whether the high or low torque output was selected on the fired working chambers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
-
Specification