Jump to content


  • Content Count

  • Joined

  • Last visited

About Scott33

  • Rank

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. True (though I'd use oil temp, not engine temp, in order to compensate for the change in oil viscosity). It'd just be nicer to have pid capabilities available in a generic way. What do you control with that output? Water pump speed, or thermostat heater?
  2. It'd be great if the GP PWM feature could be further expanded to support PID feedback control. So configuration would include things like: 1. Target map (2 or 3d map taking analog or canbus inputs and mapping them to a target value) 2. Current value (which analog input represents the current value) 3. P, I, D parameters 4. PWM frequency (assuming the PID loop is tuning the duty cycle) 5. Base duty cycle (2 or 3d map taking analog or canbus inputs and mapping them to an estimated duty cycle, in order to reduce the error the PID algorithm needs to compensate) I'm sure other parameters could be added too, but that would be a great start. With that, I could control the oil pressure on a BMW N20 engine (it has a solenoid that can be used to change the efficiency of the oil pump so one can reduce oil pressure). Without this the motor falls back to a mechanical fail safe relief valve. If it was feature-ful enough (ability to add extra maps as modifiers, either through addition or multiplication) then you could probably remove Boost Control as a separately defined function and just rely on this instead.
  3. I would like to use a Link G4+ Force GDI to run a BMW N20/N26 engine. The later N20s and all N26s use an electronic wastegate actuator. This is similar to the one in another thread, but since I have specific details to the one in my car I decided to start a new thread. First what I measured: It has a 5-pin connector, with a built in position sensor (using 3 pins - power, signal, ground), and a brushed DC motor (using 2 pins). If I apply voltage one way to the motor, the actuator moves. If I remove the voltage, it stays in position (i.e. there's no return spring). If I reverse the voltage, it moves back. Again when I remove the voltage, it stays in position. I measured the resistance of the motor, and it's 4 ohm. I measured more than 2A when driving it using a dying 12V battery (~10.4V). I see two problems with this: 1. It is more power than the any of the Force outputs can handle, barring the e-throttle drivers (which I need for the e-throttle) 2. It requires a full h-bridge output, not a single output pwm. Am I right that G4+ Force cannot handle this? I am considering building a simple wastegate controller that translates PWM duty cycle of the Boost Control output to a position, and drives the actuator based on that. I already need a helper board to handle valvetronic.
  • Create New...