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full explanation fo E-gas(drive by wire) long!
In a previous engine managament system, demands for torque and efficiency
are calculate by separate subsystem such as igniton timing, injection time ,
bosst control, etc.
The interaction between these system has become increasingly complicate as
new demands such as traction and vehicle dynamic control are added to the
system the new motronic ME7.5 is called a torque-based engine management
system. All torque and effiency demands on the system are defineas variables
that are controlled in a central module.
The resulting torque demand is conveted into injection timing, igniton
timing, boost control and individual injector cut-off for traction and
vehicle dynamic control...
The addition of electronic throotle position control allows further
modification of the cylinder charging for improved torque control. This
simplified architecture allows better co-ordinationof additional demans...
In order to meeet the torque demands as quickly as possible, demands for
torque are co-ordinated via two path:
The cylinder charge path control all charge influencing actuators, such as
throttle valve angle and waste-gate...
...The air mass necessary to develop a specific torque is determined by
means of a "calculation model" is amde avaible along the the cylinder
for the most part, long-term torque request are fulfilled along the charge
...The cranksahft-syncronous path control all interaction that occur
simultaneous with the operating cycle of the engine, such as igniton and
...The crankshaft syncronous path is used to set the injection quantity or
cylinder cut-out necessary under the given circumstances and the optimal
...This path is particulary well suited to meeting short term torque
request, which usually have a torque-reducing effect....