Patent ID: 9650971
Date: 2017-05-16
CPC Classifications: F02D

Claim:
1. A skip fire engine controller for a spark ignition engine having a throttle and a camshaft having a plurality of cams, the skip fire controller comprising: a lookup table embodied in a computer readable media, wherein each entry in the lookup table includes a firing fraction field that stores a firing fraction indicator indicative of a desired firing fraction associated with such entry, wherein the firing fraction indicator does not identify any specific cylinders to fire; a firing fraction determining unit arranged to determine a firing fraction suitable for delivering a requested engine output, wherein the firing fraction determining unit utilizes the lookup table to determine a desired firing fraction, wherein the firing fraction determining unit utilizes at least (i) the requested engine output, and (ii) a current engine speed as indices to select a desired firing fraction; a firing controller arranged to direct firings in a skip fire manner that delivers the desired firing fraction; and a powertrain parameter adjusting module arranged to adjust at least one engine actuator that affects mass air charge (MAC) such that the engine delivers the requested engine output at the desired firing fraction, wherein the at least one engine actuator affects at least one of cam phase, cam lift and throttle position.