LPG Stepper Motor
LPG Stepper Motor
A brand new LPG Stepper Motor suitable for the Leonardo or Millennium LPG systems. We have several other types of connectors/adaptors for LPG, so please check our other listings if you require a different type.
For those more technical - How does a Lambda loop system work?
The electronic ECU that controls the LPG system is very basic as there are no injectors to control, in fact the most complex process going on inside the LPG ECU is the Lambda loop. This works in just the same way as on the Petrol ECU controlling fuelling amounts. By having a Lambda sensor in the exhaust system (a Lambda sensor is capable of measuring emissions in the exhaust) the ECU is able to tell if the fuel to air mixture is either too lean or too rich, and will adjust itself accordingly.The ECU is also linked to the throttle potentiometer (throttle sensor) so that it is aware of when you want more from the engine, or are just cruising.
On your petrol ECU the adjustment is made by altering the injector pulse timing, however, this is not possible on the LPG draw-through system, as the engine is drawing LPG vapour through with relation to the amount of air going through its venturi mixer. So, between the mixer and the vapouriser, the ECU has a stepper motor which it can control to alter the amount of LPG vapour which can pass through the LPG pipe.
The stepper motor is an electronic equivalent of an adjustable valve, so the ECU can partially block the LPG vapour pipe when cruising to give better fuel economy, but can also move out of the way to allow the engine to have more fuel when you need to accelerate. Once you have the LPG system fitted, there should be three electrical shut-off solenoids in total. One will be located on the LPG tank, there is another on the OMVL vapouriser supplied with this kit, and the third is a separate solenoid which is mounted in the supply line under the bonnet just before the vapouriser, this one contains a filter as well.
All of these solenoids only become live when the vehicle is switched to, and active on, LPG, therefore, when the vehicle is running on petrol, or the ignition is switched off, the LPG system is effectively dead.
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