CYLINDER DEACTIVATION CONTROL [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)]

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Outline

•  Pumping loss due to intake/exhaust stroke is reduced to improve fuel economy by performing cylinder deactivation control during low engine loads.
•  The cylinder deactivation control stops cylinders 1 and 4, and the torque demanded by the driver is achieved by the output of cylinders 2 and 3.

Block Diagram

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Operation


Cylinder deactivation conditions

Note
•  When the PCM determines that driving the vehicle using 4 cylinders is better for fuel economy even if the following conditions are met, the vehicle is driven using 4 cylinders.

Detection item

Determination conditions
Vehicle speed
20 km/h {12 mph} or more
Driving condition
Not during acceleration/deceleration*1
Engine status
Engine completely warmed up

*1  :Cylinder deactivation is performed only while the vehicle is being driven at a stable vehicle speed.

Switching from driving vehicle using 4 cylinders to 2 cylinders

1.  When switching from driving the vehicle using 4 cylinders to 2 cylinders, the oil pressure is increased to the pressure demanded by the switchable HLA.

2.  To achieve the torque when the vehicle is driven with 4 cylinders using 2 cylinders, the throttle valve opening angle is controlled to assure the intake air amount.

3.  Cylinders 1 and 4 are stopped by (1), and the vehicle is driven using 2 cylinders.

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Switching from driving vehicle using 2 cylinders to 4 cylinders

1.  When switching from driving the vehicle using 2 cylinders to 4 cylinders, the oil pressure supplied to the switchable HLA is decreased.

2.  Use of cylinders 1 and 4 is resumed by (1), and the vehicle is driven using 4 cylinders.

3.  To achieve the torque when the vehicle is driven with 2 cylinders using 4 cylinders, the throttle valve opening angle is controlled to control the intake air amount.

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