Synchronization Trigger Control System for Flow Visualization

Format:

Conference/Event

Author/Creator:

Chun, K. S., author.

Conference Name:

SAE International Congress & Exposition (1987-02-23 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1987

Summary:

The use of cinematography or holographic interferometry for dynamic flow visualization in an internal combustion engine requires a control device that globally synchronizes camera and light source timing at a predefined shaft encoder angle. The device is capable of 0.35° resolution for rotational speeds of up to 73 240 rpm. This was achieved by implementing the shaft encoder signal addressed look up table (LUT) and appropriate latches. The developed digital signal processing technique achieves 25 nsec of high speed triggering angle detection by using direct parallel bit comparison of the shaft encoder digital code with a simulated angle reference code, instead of using angle value comparison which involves more complicated computation steps. In order to establish synchronization to an AC reference signal whose magnitude is variant with the rotating speed, a dynamic peak follow-up synchronization technique has been devised. This method scrutinizes the reference signal and provides the right timing within 40 nsec. Two application examples are described

Notes:

Vendor supplied data

Publisher Number:

870450

Access Restriction:

Restricted for use by site license