#11
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Quote:
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
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Richard L aquamist technical support |
#12
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Richard,
I would need HSV to try. I send you and email. Please check. |
#13
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Quote:
Richard
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Richard L aquamist technical support |
#14
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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? ? |
#15
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Quote:
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
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Richard L aquamist technical support |
#16
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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. |
#17
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Quote:
Richard
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Richard L aquamist technical support |
#18
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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. |
#19
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Done some graphs for ceramic atomazers water delivery VS preshure. This is done on SHUREFLOW type pump:
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#20
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Very close to the predicted chart, almost identical.
Richard
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Richard L aquamist technical support |
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