Will Depart in...
Started by FredK, April 01, 2013, 02:40:53 PM
0 Members and 1 Guest are viewing this topic.
QuoteJan,the autothrottle system is a closed loop circuit which means that the SIOC permanently checks the actual position of the lever with a target value and activates the dc motor incase of a deviation. So from Software side everything should be perfect. The reason why the levers do not move synchronized at the same time lies within the mechanical setup of the system. The steel cable tension cannot be made the same by 100 percent and the slip clutch setting on the dc motors is also not 100% the same. Maybe also the cheap chinese dc motors show a slightly different acceleration graph when powered on.All these factors contribute to very small timing misalignments for the DC motor activity resulting in slightly different lever movement.With better aligned steel cable tension, better slip clutch adjustment and better motors, the problem could be minimized (at least that would be my starting point to improve the system).Andy
Quote from: FredK on January 12, 2014, 07:23:00 AMHi All -These are some video links demonstrating the operation of my TQ.Regarding the motorized motion of the thrust levers I did make a change in the SIOC script eliminating separate slow and fast speed zones. I am now just using a single speed (slow) across the full range of motion and a null (dead) zone. What I have found is that if the motorized motion of the levers is too fast it will overrun the null zone causing a back-and-forth "hunting" phenomenon. This can be eliminated by widening the null zone but that will be at the expense of synchronized movement for the two levers. So by keeping the lever speed slow you can optimized both paramters. I am using a 15rpm rated high torque motor operating at the lowest possible speed. A 10rpm or even lower speed would probably be even better, but the way it is currently operating meets my satisafaction so I'm not going to bother changing the motors. As you can see from the video the constant slow speed is plenty fast enough. The OC DCMotorsPlus card is continuing to work fine.http://youtu.be/KPF-UHSOye0http://youtu.be/d6DtCHm1MMIFred K
Page created in 0.121 seconds with 33 queries.