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Old 22-03-2005, 09:03 PM
Richard L Richard L is offline
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Join Date: Oct 2003
Location: England
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I did some work on the in the early 02 devising a feed back system to purge the air out of the water line duringin racing condition but never got further then protoyype stage - the engineer moved to another team and the project was shelved.

The detection of water level in the tank is not as critical since the accuracy of signal from the sensor is not consistent under racing conditions due to the g-force. So the only way forward is monitoring the water line pressure against PWM of the injection valve. The pressure pulse on the line, however small, should have a direct correlation with the opening time of the water injector valve.

In the presence of air, the two signals fall out of sync, a secondary valve will open to purge some of the air out of the system whilst switching the water line to a charged accumulator and keep the water supply going.

The same system can perform the task at start up - normally done manually by a navigator pressing a purging valve when a warning lamp comes on.



The optical detection system is good but complex - as mentioned, you need some smoothing circuitry.
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