Throttle Setup.

After TPS calibration you need to set the throttle control parameters. This is done manually because throttles differ in power requirements. Some use more power to open than others and this is universal firmware to cater for most variations. There may be some throttles that cannot be controlled by this firmware but we will determine that in this process.

The throttle TPS range limits are calculated by the Orion2 automatically during Pedal TPS calibration. This setup procedure will determine opening and closing power required to control the throttle gently. It differs between different throttle manufacturers and must be adjusted for each type. If you load a map from a similar throttle then it should be working.

The Accelerator Pump in the ECU software is used for the throttle adjustments. Click the Fuel Tab. Note that the text in Red is not in the software but only for explanation which blocks to adjust. First zero Duty and Gain settings for both sides.

The throttle will then have no power on it and it should show the resting %.

If you open the throttle by finger completely it should go to 100% and closing completely should indicate 0%. Which means it was calibrated correctly.

Click on the Engine Tab.

This POT or throttle value at resting position of 9% in this case, multiplied by 2.55 should be roughly the same as the Map Teeth value that was calculated by the Orion2. Map Teeth setting is the rest position of the throttle and is a value from 0 to 255 which represent 0 to 100% throttle. Map Teeth = POT * 2.55

This is handy to know later if you want to fine tune erratic movement around the rest position.

To adjust throttle opening and closing duty.

Put the ignition on. Do not start the engine.

Put the TPS graph, Water Temperature and Idle-control off. Also put the Idle Control Low Limit Duty Cycle to 0.

Now press and keep the pedal in completely. Look at the throttle TPS in the real time screen on the POT bar. Now use the arrows of Opening Duty and increase the value till the throttle opens above 95%. Remember this value. Now reduce this value till the throttle close to 5% above the rest position (less than 9 + 5 =14%) Take the average of the two values and set opening duty to that value. In this example 115(to open) + 75(to close) = 190 / 2 = 95. Now release the throttle. If you press the throttle again, it should not open. This means you have determined neutral duty cycle where the throttle will not open or close. It will stay in any position if you press it with your finger while the pedal is pressed. If the difference in open and closing duty cycle are very small, then this neutral zone will not happen. For these throttles you will require different firmware.

Now release the throttle and increase the Closing Duty till the throttle close to 1 or 2 %. Then lower the Closing Duty till the throttle open to 8 %. (About 1% lower than rest position) Take the average of the two values and set closing duty to that value. It should be similar than the opening duty.

To adjust throttle opening and closing gain.

Now press the pedal fully and increase the Opening gain slightly. The throttle should open to about 99%. You may increase the value till you get a fast enough response and the throttle follow the pedal value. If the gain value is too high the throttle will vibrate. It should be around 4.

Now release the pedal and increase the Closing Gain till the throttle is about 1% value. The closing values should be the same value as the opening duty and gain. It should look like the example below.

Now press the pedal slowly so that the throttle read the same as rest point. Take it slowly above the rest point and back. Notice if the throttle shudder excessively on the transition point. If it does vibrate or seem to have a dead band, increase or decrease the Map Teeth and see where the throttle is smooth when it passes the rest point with the least amount of shutter. Save the settings to the device.

Idle setting

This value is the minimum opening for the TxW to control the butterfly. Now you may start the engine and adjust the Low Limit Duty Cycle till the engine idles on its own. Let the engine get up to working temperature and adjust this setting till the engine runs at the desired idle RPM. If you are going to activate Idle control, then let it idle at Idle RPM minus 100. This will allow the TxW to control the idle faster. You may now proceed to idle control setup.

Note that if your throttle requires only one direction of movement then you can skip the closing settings. You may also disconnect TxW Motor Neg2 and TxW Motor Pos2. Look at the difference in wiring diagrams.