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Topics - Hminx

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1
Technical support / PMW outputs
« on: December 02, 2024, 12:36:42 AM »
Hi All

I recently prototyped a project using PWM outputs on a T100MD 888  to operate two actuator solenoids on a truck gearbox, this works fine but when I replaced the T100 with an FMD88-10 The PWM outputs would no longer operate correctly. The outputs control two 100amp solid state relays so they aren't overloaded,  I tried another FMD88 with the same result.

Cheers Pete




























2
Technical support / PWM issues
« on: May 28, 2024, 02:25:18 AM »
Hi All
I'd appreciate any thoughts on an issue I'm having with a PWM function on a T100MD that I'm using in the development stage of a project which will shift a truck's AMT type  transmission directly to 5th gear. I need to position the gear selector actuator selector opposite 5th gear gate. I'm trying to reproduce to factory pulse train.
The problem is that the amount of PWM seems to be difficult to control for some reason. When Start contact closes the output 7 pulses at 500 hz 90% PWM but wont turn off when start contacts open and continues with the pulse train

                                                 Start         Clk:.05s                                                                                     cf  1
                                             ----II------------II--------------------------------------------------------------------{dCusF}

Function 1
' set pwm level for side shift function   
 SetPWM 1,A,500

    Function 3               
   if testio (r1) = 1
   then
   A = DM[1]
   else A = DM[2]
   endif
   
 
  if testio (r2) = 0
  then DM[1] = 0
  else DM[1] = 9000
  endif

  if testio (r2) = 0
  then DM[2] = 0
  else DM[2] = 3500
  endif


Not sure if this make sense, I know I've only shown a small part the program

Cheers Pete

3
Technical support / PID control of two contradictory PWM signals
« on: February 19, 2024, 01:08:18 AM »
Hi all

Been a few years since last used trilogi stuff but have a few up coming projects that I plan to use FMD1616-10s. The issue I'm stuck on is
how to control the  speed of an engine powering a large vacuum pump, the input signal uses two PWM signals acting together

   1.        Idle - full throttle           81 - 27 %  PWM     @ 5v  200 Hz
   2.        Idle - full throttle           17 - 73 %  PWM     @ 5v  200 Hz

The  vacuum pump is direct driven at engine speed, 1400 rpm and in this case, the speed signal at this speed is 23 Hz, and scoping the throttle signals while operating the throttle manually indicates signal 1 at about 53% and signal 2 at about 46%.  Ssooo.... what I need to do is work out some method of PID control over two control signals that move in opposite directions.

I would be quite willing to have a crack at sorting out a single channel control but the two opposing signal thing is a bit beyond me so any help would be greatly appreciated

Cheers Pete

Oh by the way, I assure you I'm not a student asking some one to do an assignment I should be doing myself  ;)





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