A first control unit executes a valve stop inertial running including stopping an intake valve and an exhaust valve in a closed state during rotation of an output shaft, stopping supply of fuel to an engine, and setting a clutch in an engaged state to drive pistons of the engine by a rotational force from driving wheels. A second control unit executes a valve operation running including operating the intake valve and the exhaust valve during the rotation of the output shaft, and supplying the fuel to the engine based upon an intake conduit pressure. When a cancellation request is made during execution of the valve stop inertial running, a transient control unit operates the intake valve and the exhaust valve, and controls a throttle valve to an idling opening or less, thereby supplying a negative pressure to an intake passage.

Disclosed are a hybrid electric vehicle and a control method thereof. In particular, the hybrid electric vehicle includes: an engine with a supercharger using exhaust gas; a driving motor; and a controller configured to determine whether entry into an acceleration state accompanied by turbo lag of the engine is expected while the engine operates, increase boost pressure of the supercharger before entering the acceleration state when it is determined that the entry into the acceleration state is expected, and control a torque of the driving motor to offset an engine torque of the engine that is increased to increase the boost pressure.

A control unit detects changes in operation of a powertrain of a heavy-duty vehicle is provided. The control unit obtains information indicating that at least one powertrain sensor signal monitoring sequence is to be performed, and obtains a set of vehicle powertrain operation parameter settings to be applied during the at least one powertrain sensor signal monitoring sequence. The control unit then controls the operation of the powertrain of the heavy-duty vehicle according to the obtained set of vehicle powertrain operation parameter settings for a determined time period. The control unit also determines virtual sensor values based on sensor signals from one or more powertrain sensors, wherein the sensor signals are obtained during said determined time period. Further, the control unit detects a change in the operation of the powertrain of the heavy-duty vehicle in case the determined virtual sensor values indicate a different operation of the powertrain of the heavy-duty vehicle as compared to previously determined virtual sensor values using the same at least one powertrain sensor signal monitoring sequence.