New to forum / Custom WI system for AUDI

[Richard L]

Originally Posted by simple

Richard, can you post some specifics for HSV valve.
I wonder how I can drive it. I believe it has 250Hz max operating frequency.
I need to know what signal needed to drive (like square pulse) and what is recommended signal duration to operate it at 1% duty and 99% duty.
What is it? internal resistance, so I can work out power consumption. Also what is it?s inrush current (if know)?

Car specifics as mentioned before:
1.8L Turbocharged motor / 4 cylinder
Four inlet ports/ 3 intake valves per port.

Considering using one HSV to operate two M3 nozzles (mounted in common section of plenum)

The HSV's coil resistance is 13ohms. on time is 2ms and off time is 2ms, overall is 4ms = 250Hz max. cycle rate. I suggest drivng the valve at 30-80Hz

at 30Hz: the maximum duty cycle span is 88%
at 80Hz: the maximum duty cycle span is 68%

You can improve the span by starting your opening pulse at >2ms so the new span becomes:
at 30Hz: maximum span is 94%
at 80Hz: maximum span is 84%

Further improvement of the shutting time can be made by controlling the decay time of the HSV via the clamping of the back emf's peak voltage rise.

It order to achieve 99%, you need to consider using a "peak and hold" circuitry to minimize the residual current left in the coil after switching off.

In practice, I will just run it at 50Hz, starting pulse at 2ms and finish at 18ms - for 0-100% duty cycle control.

Richard