Adapter phasor control hold duty cycle system for an engine

An adaptive camshaft phasor control system for an engine comprising:

• memory that stores control hold duty cycle (CHDC) values;
• a camshaft position sensor generating a current camshaft position signal based on position of a camshaft;
• a first comparator that generates a relative camshaft position signal based on said current camshaft position signal and a crankshaft position;
• a second comparator that generates an error signal based on said relative camshaft position signal and a commanded camshaft position signal;
• and
• a control module that:
• determines a CHDC value for a camshaft phasor based on an engine state parameter;
• generates a correction signal based on said error signal;
• adjusts said CHDC value based on said correction signal to generate a commanded duty cycle signal;
• and stores said commanded duty cycle signal in said memory.

A method of operating a camshaft phasor control system comprising:

• determining a control hold duty cycle (CHDC) for a camshaft phasor based on an engine state parameter;
• generating a commanded camshaft position signal;
• determining a current camshaft position relative to a crankshaft;
• generating an error signal based on said commanded camshaft position signal and said current camshaft position;
• generating a correction signal based on said error signal;
• adjusting said CHDC based on said correction signal to generate a commanded duty cycle signal;
• and
• storing said commanded duty cycle signal in memory.