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

[simple]

Richard,
I would need HSV to try. I send you and email. Please check.

[Richard L]

Originally Posted by simple

Richard,
I would need HSV to try. I send you and email. Please check.

Have got your mail and replied.

Richard

[simple]

Currently looking in to how to drive HSV. Probably will test varying pump speed with conjunction with HSV. Calculation for water delivery will be a nightmare but this is a software guy problem

By the way, Richard, ?peak and hold? drive principle is not suitable as HSV has high resistance. Do you supply them with 3-4Ohm coils suitable for ?peak and hold? ?

[Richard L]

Originally Posted by simple

Currently looking in to how to drive HSV. Probably will test varying pump speed with conjunction with HSV. Calculation for water delivery will be a nightmare but this is a software guy problem

By the way, Richard, ?peak and hold? drive principle is not suitable as HSV has high resistance. Do you supply them with 3-4Ohm coils suitable for ?peak and hold? ?

I would not recommend vary the pressure of pump the AS WELL AS varying the duty cycle of the HSV. The only time when you want to vary the speed/pressure of the pump is to compensate the manifold/water pressure differential.

Life would be a great deal simplier if you deal with a valve-PWM system rather then pump-PWM system. As the early chart show, the relationship between the pump speed and flow in not linear at all. It will definately a nighmere to map/tune the water flow with some consistancey fuel flow. I based on the assumption that the purpose of water is the replace the necessarity of running an over-rich fuel mix and result in better power, cooler potential.


Richard

[simple]

Will consider your advice Richard.
Can I get you to reply to my Email with Proforma invoice?
Thank you!

I really want to get my hands on HSV and see what it can do.

[Richard L]

Originally Posted by simple

Will consider your advice Richard.
Can I get to reply to my Email with Proforma invoice?
Thank you!

I really want to get my hands on HSV and see what it can do.

I have just sent you any email, you omitted for the HSV but instead a standard low-speed on/off valve. Please correct or amend the list I posted.

Richard

[simple]

Thank you Richard, I appricate your time very much.
Order placed, payment arranged. Please let me know when order will get dispatch.
At this stage I cannot do much but wayt for parts to test so I can confirm our electronics configuration circuitry. By the way this is the specs for set up. Anyone's comment welcome :smile:
----------------
WI system specs

General:
System to have rectifier bridge and filter for electronics to prevent reversal of polarity feed and take out possible spikes (voltage regulator 12V for electronics?) and on board fuse. Also to have on board supercap for temporary chip?s memory back up.


User interface:
? UP & DOWN, RIGHT & LEFT, ENTER buttons for menu
? Backlight ON/OFF button
? LCD screen

System Memory:
? MS memory card (of similar)

System inputs:
? Injector duty cycle (two inputs)
? MAP sensor absolute
? MAP sensor differential
? EGT temperature sensor
? Ambient Temperature sensor
? Turbine discharge temperature
? Engine intake temperature
? Engine block temperature
? Knock sensor signal
? Water low sensor(selectable 12/ground/sensor pin)
? Ignition ON (activation)
? Power (12V/15A input)
? Pump power supply interruption ( build-in over pressure sensor)


System outputs:
? Pump voltage control
? HSV duty cycle control (two independent outputs for future use .CPU support? )
? Solenoid ON/OFF control (2 / one for IC spray, one for water flow cut off)
? System programmable output (two / +12/ground)

--------------

Specs to be confirmed as hydrolic hardware get tested.

[simple]

Done some graphs for ceramic atomazers water delivery VS preshure. This is done on SHUREFLOW type pump:

[Richard L]

Very close to the predicted chart, almost identical.

Richard