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Summary of change:
Vanos - BMW's variable intake / exhaust timing system. My engine uses Single vanos, which only advances the intake cam. From here: http://www.bmwworld.com/technology/vanos.htm Just off idle, the DME energizes a solenoid which allows oil pressure to move that cup gear to advance the cam 12.5 degrees at midrange, and then at about 5000 rpm, it allows it to come back to the original position. Firmware can only handle an off-on situation (not off-on-off). There is no need for firmware changes to support single VANOS, use one of the misc output functions to be active within a certain RPM range, you may have to use the inverted function on the output depending on the logic function of the VANOS solenoid. ---- '''Dual vanos''' changes both of the exhaust and intake cam timing, PWM controlled (not on/off like single vanos). * cam-sync must measure valve-position, with respect to primary trigger (crankshaft) position * target valve-position in function of (RPM, load) * the error signal is used in a software PID controller * the output of the PID controller is called command signal: ** command can drive 1 PWM signal in the suzuki VVTI (we're testing on Suzuki engine first; than on BMW and Mitsubishi). ** BMW needs 2 output PWMs: when command is 50..100%, solenoid A is powered (0..100% duty). When command is 50..0%, solenoid B is powered (0..100%). BMW also needs 2 high current output stages (Beyond stepper current limit. Maybe 2A ? Anyone can measure solenoid resistance ?) '''HIGHSIDE endstages''' (perhaps PNP transistor on heatsink, with diode flyback). * controlling both intake and exhaust valves is theoretically simple, just double everything. ** However, to be able to use a third VR-trigger input (in PS2 keyboard data input, often used for wheelspeed HALL signal), a VR=>HALL is also required in the 4PNP amplifier box.
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