YourDyno.com Load control demonstration on water brake

This video shows water brake control using a regulator we call "Load control". It is different from regular PID controllers, and very well suited for water brakes and other non linear brakes.

[@MuhammadSaleem-ls9hv]

Dear Sir,
I hope you will be fine and working well.
We have water brake Dynamometer (Model: Omega 3200 S3, Capacity: 3200KW) of AVL. We are facing following problems in dynamometer during testing and commissioning (Max Load: 12000NM, Max RPM: 2100).
1)    Load stability at low rpm is very less than greater rpm.
2)    Normally load fluctuation is about ±20 NM and sometimes load fluctuates about ± 300NM.
3)    When applied load is nearest/above to 50% load then suddenly load rises about 5-7 KNM within second and dyno loses its control at load.
4)    When suddenly load rises about 5-7 KNM then we set dyno and engine in idle mode (Speed: 500RPM, Load:

[@robertmaier8959]

Sounds to me like a straight proportional controller. PID without the ID.

[@YourDyno]

The gain is a proportional component but it is more complicated than a P controller. A straight proportional controller will have a large RPM error, since it is the RPM error times the Kp that sets the brake %.

[@ProjectoD77]

It would be nice to test a naturally aspirated engine with the different sweep rate to see if the results are the same.

[@robertmaier8959]

@@bigboreracing356 Dude, godzilla just had a stroke trying to read this response.

[@gothicpagan.666]

@@bigboreracing356Bench dyno's are most usefully for bedding a new engine down. To optimise a tune you would need to know the rate of RPM increase when installed in the car, in each gear, and map accordingly.
The materials used to make power (fuel&air) are replenished as is the material for measurement of energy, in this case water. The only variable is heat accumulation, though at 300rpm/Sec, with a reasonable cooling set up that is not an issue.

[@gothicpagan.666]

@@bigboreracing356 That shows up in rate of RPM increase

[@freddykoopmans6985]

the video contains a lot of information. But it tells only how they got the nice measurement and it does not realy explain what happens with the diferent settings and how to recognize the the behavior what each stetting is doing.... increase valus or degreas valus I am coping with sireusus oxiclation...... and i have clue afther this video were to start solving my oxiclation problem in this mode.

[@YourDyno]

Basically Gain sets how "hard" the controller will regulate and Derivative factor sets how much more brake the controller gives when the engine accelerates. A good starting point is Gain = 15 and Derivative factor = 0.02. But best setting varies with the setup. You can also go to the Advanced page and set different ramp rates and gains for different RPM ranges. Contact me at [e-mail], I can help you with the adjustment

[@freddykoopmans6985]

@@YourDyno in some older video's you showed a water pressure valve and a pressure accumulator, are you still using this to get your water supply consistence and om what level does the the water pressure effect the measuring ?

[@YourDyno]

@@freddykoopmans6985 You need regulated pressure, normally achieved by a bypass pressure regulator. In addition to keeping the pressure stable, the bypass regulator lets the water go back to the tank so the pump is not deadheaded when the valve is closed. The accumulator tank is used in some setups but many work well without. If the pressure regulator is far away from the brake then more likely you can benefit of the accumulator tank, since a local accumulator tank effectively reduces the distance you need to accelerate the water