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'''This page is about how to control an evaporator canister - sometimes called as charcoal purge canister''' The evaporator canister is ment as a temporary storage for gases from the fuel tank, instead of releasing them to atmosphere. A simple valve controlled by GenBoard releases the gases to the intake given some conditions are met. * low RPM * low MAP * warm engine * closed-loop operation * ... ? Maybe with WBO2 closed loop control the condition becomes very simple. Since we haven't seen much research/feedback on this (anyone want to contribute links or experience?) ... I plan to install a solenoid to suck out the evaporator canister from time to time, using the same condition as for the variable intake with MembersPage/MarcellGal/EngineSwap/AirFeed : 1500..3000 RPM, 80..101kPa MAP. Actually planning to use same ECM output (a FET), but different solenoid (the 2 solenoid connected in parallel electronically). google words: ... pages: ... Fero (or someone else), can you collect info about valve control that I believe was collected before but misplaced? Hooked up the scan tool to an 01 civic, here is what I get. *coolant above 70 c *after that, the duty cycle changes based on rpm but it is graduall. *Start car, 30 seconds or so later, approx 10% duty cycle. Leave it at idle, it creeps up to a max of about 30% in about 1 minute. *Slight throttle input jumps to 30% then if maintained, will climb slowly to about 60%. *Full throttle, is 100%. *ON decel, duty cyle is 0% *The more throttle, the more the dutycyle goes up, but it does it slowly, unless the throttle is moved quickly, then it will do a small, quick jump, but creep up the rest of the way to its full amount. I can do more in depth testing if needed. EricN Thanx, very good info. A bit more complex than I thought. Apparently, it tries to avoid sucking the hell out of the canister (or adding extra air at low-load, whatever we call). Also, it changes slowly, so the EGO-correction can follow. Also looking at this here: MembersPage/DavidBlades/FanTest ---- '''See also''' * BoostControl : similar (small solenoid air-) valve is used
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