FROM TAME KITTEN TO A FEROCIOUS BEAST
Camshaft Phaser and VVT technology transforms engine timing
Variable Valve Timing (VVT) is a technology introduced a few decades ago. One had to choose between timing their valves for civilized and friendly engine perfomance or one that was ill-mannered, yet powerful. Now with this VVT technology and cam phasers one can have both.
In the beginning, the timing chain controlled cylinder firing and valve opening throughout different road conditions, from idling to full-power up hill. With more and more climate consciousness and fuel economy considerations taking the forefront of engine design, all major car manufacturers are now looking for ways to reduce emissions and increase fuel economy.
Of those competing to come up with their own VVT devise, Hilite International was in the forefront of innovation. Hilite came to SensorData to help in the efforts to measures the torque on the camshaft at cam speeds of 250 to 4000 rpm. FIG XXX A 100Nm inline torque meter was to be developed for this project to be installed between the phaser and cam lobes.
With torque and rotating speed within a good number of SensorData sensors, it was easy propose a model with some minor modifications.
https://www.hilite.com/en/products/engine-products/fastphaser-system
FastPhaser® – An intelligent and compact solution
The intelligent hydraulic circuit of the optional FastPhaser® system allows the oil that returns during adjustment to be used. Increasing the adjustment speed whilst simultaneously reducing oil consumption and improving functional stability when running at idle speed and hot temperatures allows the camshaft adjustment system to be redimensioned. The phaser can be designed in a more compact way, and the functional limits of the hydraulic camshaft adjustment system have been expanded. The FastPhaser® system allows for implementation inside components with little additional effort. By using the system, great improvements can be made in relation to adjustment speeds and oil consumption. In this way, adjustment speeds between 200° Kw/sec and 500° KW/sec can be easily achieved at all operating points with a high degree of controllability, and are implemented in various series applications.
https://www.carparts.com/blog/what-is-a-cam-phaser-plus-symptoms-and-replacement-cost/
Nearly all late-model vehicles are equipped with variable valve timing (VVT). The technology can improve engine performance, reduce emissions, increase fuel economy, or all of the above, depending on the system configuration.
One or more camshaft actuators—also known as camshaft phasers—act as the heart of the VVT system. When conditions are correct, the phasers alter the position of the camshafts to adjust the engine’s valve timing.
In a traditional engine, valve timing (when the valves open and close) is fixed. But with a modern VVT system, the position of the camshaft (s) can be adjusted, thereby altering valve timing. Having this ability can improve engine performance, increase fuel economy, or both.
Several different components work together within a typical VVT system. Most vehicles use a hydraulically-operated phaser (aka actuator) located at the end of the camshaft to change the camshaft’s position and retard or advance valve timing.
An oil control solenoid (often referred to as a VVT solenoid), applies oil pressure to activate the phaser. The PCM controls the VVT solenoids based on input from various sensors.
https://en.wikipedia.org/wiki/Variable_Cam_Timing
Variable Camshaft Timing (VCT) is an automobile variable valve timing technology developed by Ford. It allows for more optimum engine performance, reduced emissions, and increased fuel efficiency compared to engines with fixed camshafts. It uses electronically controlled hydraulic valves that direct high pressure engine oil into the camshaft phaser cavity. These oil control solenoids are bolted into the cylinder heads towards the front of the engine near the camshaft phasers. The powertrain control module (PCM) transmits a signal to the solenoids to move a valve spool that regulates the flow of oil to the phaser cavity. The phaser cavity changes the valve timing by rotating the camshaft slightly from its initial orientation, which results in the camshaft timing being advanced or retarded. The PCM adjusts the camshaft timing depending on factors such as engine load and RPM.
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