Cold Start Compensation

 

The TxW can do cold start compensation. It compensates by increasing the min opening of the throttle. It is more stable than to lift the target RPM’s. It will operate even if idle control is not used.

 

To use cold start control, the unit requires a water temp sensor. Orion2 has a jumper for the pull-up resistor for the water temperature sensor. If you have a standalone sensor, then the jumper must be on. If you want to tap into another sensor, then the jumper must be off. Note that the curve for both sensors is for the 2K NTC resistors.

 

Put the option On for the Water Temperature. Put the calibration value on 100. The water compensation graph will replace the Low Limit Duty Cycle value as idle setting.

 

 

 

With temperature compensation selected, the water graph for fuel will be used as the minimum closing duty cycle with temperature compensation. Note that the graph on the Y-Axis is used from 0 to 100 which means 0% to 100% opening. For a cold engine you can raise the value which will let in more air to compensate for poor fuel burn. This feature can also be used without idle control. See the graph below.

 

 

 

If the Water Temperature setting is off, then there will be no water temperature compensation for cold start. The Idle Control Low Limit Duty Cycle value will be used as idle setting.

 

 

Note that a big part of idle control lies in fuel and timing tuning. See the section in the ECU manual how to compensate for that.