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HellaSweep - Wiki

HellaSweep

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I recently bought a Garrett GT2256V electronically actuated variable-vane turbocharger. Using some hints from the guys a the superturbodiesel.com forums [link], I wrote an Arduino sketch to control the Hella actuator on this turbo.

Image:Hella-progress.jpg

Image:Hella-actuator.jpg

Contents

video

here's a video of the actuator in action! http://www.youtube.com/watch?v=ENSbcuCAXt0

code

here's the source: http://jason.pepas.com/code/hellasweep/HellaSweep.pde

parts of the program were inspired by Ken Shirriff's excellent article on arduino PWM stuff: http://arcfn.com/2009/07/secrets-of-arduino-pwm.html

hex

here's the hex (compiled for atmega168): http://jason.pepas.com/code/hellasweep/HellaSweep.cpp.hex

Hella PWM interface

the guys at superturbodiesel.com figured out the pinout [link]:

pin 1: 12v
pin 2: GND
pin 4: control (PWM)

The Hella actuator acts much like a servo, interpreting a PWM input signal as a position command. However, the Hella actuator responds only to a narrow frequency band. I used the above code to experimentally determine the limits of this frequency range. The frequency range which worked for me 135 to 146 Hz.

Image:Hella-timing.jpg

Additionally, the guys at superturbodiesel.com discovered that it also only responds to a certain range of duty cycle. My findings pretty much corroborate their's. The actuator doesn't seem to move any lower than a duty cycle of 15%, and above 98% it appears to assume the input has been shorted to 12v.

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