In a hybrid vehicle equipped with an engine and a motor that are connected
to a driveshaft linked to an axle via a gear mechanism, on condition that
an output torque of the motor (previous Tm2*) is not lower than a preset
reference output torque Tm2ref (step S190) at a moment of a start
requirement of the engine (steps S130 and S180), the drive control of the
invention starts the engine (step S220). On conditions that the output
torque of the motor (previous Tm2*) is lower than the preset reference
output torque Tm2ref (step S190), that a torque demand Tr* is lower than
a preset reference torque level Tref (step S200), and that a state of
charge SOC of a battery is not lower than a preset reference charge level
Sref (step S210), the drive control keeps the engine at a stop (step
S140), regardless of the start requirement. This arrangement effectively
reduces the potential for backlash or gear rattle in the gear mechanism
due to a torque pulsation applied to the driveshaft at a start of the
engine.