Modern engines require that both intake

Modern engines require that both intake and exhaust camshaft timing be adjusted in real-time to meet emissions and performance standards, so vehicle producers use mechanical tools known as cam phasers or reflectors to make this adjustment. A cam phaser changes intake camshaft timing using an angle-changing mechanism attached to its camshaft, while another mechanism known as trigger wheels on this mechanism varies its position while transmitting camshaft role comments signals back to an onboard controller for control purposes.

A basic cam phaser uses a variable cam lobe with variable shapes along its length, where one end features a shorter duration and reduced lift profile, and the other has a longer duration and higher lift profile. Shifting this area changes valve opening/closing profiles accordingly.

An advanced system consists of two closely spaced parallel camshafts connected by pivoting cam-followers that span both shafts. A phasing mechanism allows each cam to change its angular position relative to a belt-driven pulley by desired intake or exhaust valve duration by altering the spacing between lobes to move through an approximate 100-crankshaft-degree range.

An ideal Camshaft Phase Regulater consists of a vane-type device with a coil spring subject to torsional compression or extension, with one end connected to a camshaft cover plate or backplate and another connected directly to its cavity and phaser rotor via its second end. It features an offset-neutralizing bias tang 48 which engages bore 52 or slot 54 of its phaser rotor for compensated hydraulic operation and rapid response when demanded by demand to advance camshaft duration.

An engine control module uses a process known as camshaft pulse counting to calculate and select an optimal camshaft segment perspective, then divides that by crankshaft rotational speed to arrive at its camshaft phase angle value. Once finalized, this result is sent via the PWM output channel on the low-side driver board to control the oil control valve solenoid that controls the camshaft section.

The application will filter the cam/crank signal to produce meaningful measurements of cam phaser position, convert this into an offset angle concerning fixed crank angle, and send that duty cycle onto a low-side driver board that controls VVT solenoid for output use in changing intake and exhaust camshafts accordingly and improve engine performance as well as gas mileage. For optimal results, adjust VVT solenoid settings accordingly for best results; optimal adjustment should not exceed values either extreme.