223002896 - E5032 METHANE ENGINE ELECTRONIC MANAGEMENT - DESCRIPTION (BIPOWER, MY 2005)
The petrol supply system is managed by a control unit that also controls both ignition and injection.The methane supply system is managed by another control unit that controls methane injection and the switching logic for the methane/petrol fuel system which takes place automatically or manually, using the special switching button in the dashboard.Both control units are inter-connected by a CAN network.The engine management can be optimised under all operating conditions and with any type of fuel system due to the continuous communication between them.Depending on the signals received from the numerous sensors, the two control units, which share some signals from certain sensors, operate the respective actuators that are connected, managing the following systems:- petrol supply;- methane supply;- air supply;- engine cooling;- fuel vapour recirculation;- control of combustion - Lambda sensors;- control of exhaust with catalytic silencer.The current version of the system also includes the EOBD function (European On Board Diagnosis) - that allows the continuous fault diagnosis of the components for petrol operation correlated with emissions and signals the deterioration of any of these components by switching on the injection/EOBD system warning light (amber).The diagnostic system includes:- the catalytic silencer which, in the case of a malfunction, does not convert the pollutants produced by the engine;- the Lambda sensors (oxygen sensors);- misfire, where the unburnt fuel reaches the catalyzer where the thermal conversion reactions produce a sudden increase in temperature damaging the actual catalyzer.The methane system complements the basic system and the operation of the basic system is not affected in all operating conditions.The specific control unit manages the phased, sequential methane injection and the activation of the (methane) gas cut out solenoid valves in addition to the deactivation of the petrol pump.Injection takes place directly through the operation of the specific methane system injectors.The ignition advance is achieved by sending the basic electronic unit the advance variation to be added to the one for petrol operation.This communication takes place through the CAN network.The methane electronic unit uses the signal from the methane perssure and temperature sensor on the manifold to correct the injection times, thereby controlling the exhaust emissions which are within the current regulations - EOBD -.If the control unit identifies a serious fault (e.g. in the methane injectors) switching to petrol operation is automatic and, at the same time, this is signalled via the instrument panel.If the unit identifies a less serious fault, this is signalled but methane operation continues.All the other engine management functions, including the ignition advance, are left to the basic engine management control unit. | The engine normally runs on methane. If the methane has run out, the system automatically switches to petrol operation and the special warning light comes on. |
 | For starting and after refilling with methane the engine normally runs on petrol for a few seconds to keep the pump, the injectors and the specific ducts working properly. |
| there should be no manual switching from petrol to methane operation and viceversa during starting. |