Operating Condition

Vehicle stop mode (Idle stop) 

The engine stops idling if the IMA battery is sufficiently charged.

Start running mode (Engine and IMA motor) 

The engine runs on the low lift cam. The IMA motor increases torque.

Slow acceleration mode (Engine only) 

The engine runs on the low lift cam. The IMA motor does not assist.

Low speed cruise mode (IMA motor only) 

The IMA motor runs the vehicle by itself if the IMA battery is sufficiently charged. The intake and exhaust valves pause to reduce valve spring compression and pumping loss.

Acceleration from low speed mode (Engine and IMA motor) 

The engine runs on the low lift cam. The IMA motor increases torque.

High acceleration from low speed mode (Engine and IMA motor) 

The engine runs on the high lift cam. The IMA motor increases torque.

High speed cruise mode (Engine only) 

The engine runs on the low lift cam. The IMA motor does not assist.

Deceleration mode (IMA battery charge) 

The intake and exhaust valves pause and reduce engine braking force. The IMA motor simulates engine braking force by regenerative charging of the IMA battery.