2. ‘Multiair’ is an electro-mechanical variable
valve actuation technology which is used to
control air intake in engine by solenoid
valve.
3. Multi air engine is different from other
engines because it consists of solenoid
valve.
A solenoid valve is an
electromechanical technology used for
functioning of valves.
4. Working of solenoid valve
Valve is closed (current not flow) Valve is open (current flow)
6. Lift, timing & duration of valve
opening is varied by controlling
solenoid valves
This is done by ECU when
signals are sent from the
sensors
7. Sensors sense parameters &
send signals to ECU
ECU contains microprocessors
with associated software
This ECU controls the actuators
to work according to
requirements
8. Advantages
Higher torque & power- 10 to 15 %
increase
Reduction in size & weight
Better fuel economy- 7 to 10 %
increase
9. Disadvantages
Opening & closing of valves
requires some power-
Electromechanical- alternator
Current solenoids cannot run at
high rpms;
Hidden cost of microprocessor
& software controls
10. Even though some disadvantages
are present, we can expect
electromechanical valves to replace
the conventional camshaft
technology.
