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Once properly installed and communication has been established between the tuning laptop and VVTuner, the controls and use will be fairly straight-forward if you’ve even done any tuning before. When you open the VVTuner software, you’ll see a 12×12 advance target table, PID tuning parameters, and system status indicators.
Hello friends, I am to implement Auto Tuning PID control, to control the power applied to Heater to control the temperature. I used PT100 RTD based temperature sensor, which is working very well. A general PI routine, in which I feed the P & I values manually, also is woring very well.
The 12×12 advance target table allows real time adjustment of target advance at any point along the X and Y axis. Engine speed (RPM) is represented along the X-axis while engine load (MAP) is represented along the Y-axis. As both the engine speed and load change, a corresponding cell is targeted in the table. The target cell represents the closest camshaft advance data point for the engine’s current RPM and MAP. The value within the target cell is interpolated (averaged) between the target cell and the cells to its top, top right, and left. To command more camshaft advance, insert a larger number in the cell. To command less advance, insert a smaller number.
Status values displayed along the top of the screen include engine speed (RPM), engine load (MAP), target advance (degrees), current advance (degrees), and the duty cycle of the signal sent to the OCV. Along the status bar at the bottom of the screen, the indicators display serial connection status, engine status, battery voltage, logging status, and VVTuner CCM version.
VVTuner’s advance control implements a closed loop feedback algorithm with PID loop to insure that the amount of advance commanded results in the actual advance. VVTuner constantly monitors the real time target advance value and compares it against the actual value observed by reading the crank and cam position sensors. Any difference between target advance and actual observed values is considered an error. The PID loop will attempt to correct the error. The PID parameters allow real time adjustment of how the error is corrected. PID is comprised of 3 terms:
The idea is to eliminate any advance error as quickly as possible by quickly bringing observed advance to target advance, but slowing down the correction as the error approaches zero such that the target is achieved quickly and without and undershoot, overshoot, or oscillations around the target. The values preprogrammed to VVTuner were found to work well with a standard 2001-2005 Miata VVT motor after extensive research. However, as no two engines are alike, you may need to alter the PID values. Please note that when any of the three parameters are adjusted, the loop is re-initialized and the PID I-value accumulation is reset to its starting point.