Patent ID: 9683468
Date: 2017-06-20
CPC Classifications: F01L,F02D,F02M,F02N,Y02T

Claim:
1. A method of operating a camshaft of an engine in a vehicle, comprising: during a first vehicle drive cycle, only after output from a camshaft sensor is determined to be available and sufficiently accurate including after engine speed exceeds a threshold speed and after cranking of the first vehicle drive cycle, determining a correction based on a difference between a camshaft position indicated by the camshaft sensor and a camshaft position indicated by a motor controller coupled to the camshaft, the first vehicle drive cycle terminated with an engine shutdown; and during a second vehicle drive cycle following the first vehicle drive cycle, cranking the engine from rest, including while the output from the camshaft sensor is determined to be unavailable and insufficiently accurate, and during the cranking, adjusting the camshaft based on a camshaft position indicated by the motor controller and the correction.