Vehicle travel control device for controlling a running mode of an engine

A running control device of a vehicle having an engine, an alternator generating electricity from rotation of the engine, a battery storing electric power generated by the alternator, a steering wheel operated by a driver, and an electric power steering system assisting a steering operation of the driver by using electric power of the battery,

• the running control device of a vehicle being configured to execute an engine coupling running mode enabling an engine brake running mode performed by coupling the engine and wheels with an engine brake applied by driven rotation of the engine, and an inertia running mode performed with an engine brake force made lower than that of the engine brake running mode, the running control device of a vehicle including a steering angle of the steering wheel as a condition of terminating the inertia running mode,
• the running control device of a vehicle performing a first inertia running mode performed with the rotation of the engine stopped and a second inertia running mode performed with the engine kept rotating as the inertia running mode in accordance with predefined respective execution conditions,
• the first inertia running mode being terminated when the steering angle becomes equal to or greater than a predefined first determination value while the first inertia running mode is performed,
• the second inertia running mode being terminated when the steering angle becomes equal to or greater than a predefined second determination value larger than the first determination value while the second inertia running mode is performed.