Method of controlling camshaft phase based on humidity

A method of controlling intake and exhaust cam phase in an internal combustion engine based upon humidity, the method comprising:

• sensing an engine speed and an engine load of the internal combustion engine,
• sensing relative humidity of air delivered to the internal combustion engine,
• utilizing the sensed engine speed, the sensed engine load and the sensed relative humidity in multi-dimensional lookup tables to determine a minimum intake cam phase constraint value and a maximum exhaust cam phase constraint value, and
• decreasing the maximum exhaust cam phase constraint value and increasing the minimum intake cam phase constraint value as the sensed relative humidity increases.

A method of controlling intake and exhaust cam phase in an internal combustion engine, the method comprising:

• providing a torque demand signal based upon an operator input,
• sensing a speed of the internal combustion engine,
• establishing phase angle constraints of an intake cam phaser and phase angle constraints of an exhaust cam phaser based upon the torque demand signal and the engine speed,
• establishing relative humidity of ambient air provided to the internal combustion engine,
• utilizing lookup tables to advance the phase angle constraints of the exhaust cam phaser and retard the phase angle constraints of the intake cam phaser from the established phase angle constraints as the relative humidity increases and retard the phase angle constraints of the exhaust cam phaser and advance the phase angle constraints of the intake cam phaser from the established phase angle constraints as the relative humidity decreases.