Electric Wastegate
Electric Wastegate
Introduction
The Electric Wastegate function within NSP has been created to allow end users the most simple method to implement full functionality with any of the Turbosmart e-WG products. Using our simple drop down menu, any one or two Turbosmart e-WG's can be selected. This will need to be followed by the correct wiring, calibration, and then boost control mapping.
Wiring
Through the navigation tree within NSP, enter the Wiring configuration tab for boost control, and select your wastegate(s) in the Output Type pull down menu. The Wiring node is used to change between regular solenoid based boost control, and electronic wastegate control.
You will now need to select the pins used for Wastegate 1 Drive Motor +, Wastegate 1 Drive Motor -, and Wastegate 1 Position Sensor. By default, when you select your wastegate(s), the default pins will be unassigned as displayed below.
You can select any of the Half Bridge Outputs on the Nexus for the Motor Drive wires, and any of the AVI's for the Position Sensor. By clicking on the Edit icon for each required input/output, assign the relevant pin according to your wiring setup. Here we have assigned HBO1, HBO2, and AVI13 as can be seen.
You may be asked to reset your ECU for these settings to take effect. Upon resetting, there should be no red warnings present in any of the wiring settings within Boost Control. If you have not already configured your Wastegate Temperature Sensor(s), you will find that there will still be a warning for the relevant sensor. This needs to be configured as another AVI pin as displayed below.
Wastegate Temperature is a required input for the Electronic Wastegate control, as the circuitry used for the wastegate position sensor becomes unreliable at temperatures above 150 degrees Celsius. If the wastegate temperature rises above 150 degrees Celsius, the ECU will hold the wastegate in an open position until temperature drops below 140 degrees Celsius.
Here we are using AVI14. We should now have no errors in wiring and be ready to calibrate the wastegate.
NOTE: Pull Up is not required as the Wastegate has its own internal Pull Up.
Calibration
Enter the Electric Wastegate Settings node located as shown below.
Click the reset button for the wastegate needing to be calibrated. The Status should display Uncalibrated for each uncalibrated wastegate. Click on the Calibrate icon and the wastegate will perform its calibration automatically. The process will progress from Step 1 - Limit Calibration, then Step 2 - Dynamics Calibration, then complete. You will be alerted when this process is completed successfully by the two progress bars highlighted green and Finished appearing. The Status should now have changed state to Calibrated as seen below. This wastegate is now ready to be used.
NOTE: The wastegates are calibrated individually, so if two wastegates are being used, this process will need to be repeated for the second wastegate.
Tips & Tuning
Haltech has designed the Electronic Wastegate control strategy to help speed up and simplify the tuning process for the user. Existing boost control strategies can be used with minor adjustments from the tuner, and the tuning process should be familiar to any user who has tuned a closed loop boost control system previously.
When using an Electronic Wastegate, the Boost Control function retains its usual control range of 0 to 100% duty, where 100% will request maximum flow through the turbo, and 0% will request minimum flow through the turbo, just like in a solenoid based pneumatic boost control system. However, when using an Electronic Wastegate as the Output Type, the Boost Control function converts the boost output duty to a target wastegate position while taking into account the differing flow characteristics of the e-WG across varying valve positions. This means the relationship between the Boost Control output duty and the wastegate flow is linear.
Tuners should consider the increased response time of an e-WG when compared to a pneumatic based system, and therefore need to take some slightly different approaches when tuning the Boost Control function. Haltech has provided extended tuning tables for some Boost Control settings such as the Control Offset in order to simplify the tuning process for different Boost Control scenarios.
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