VEHICLE CONTROL METHOD AND VEHICLE CONTROL DEVICE
An under-floor catalyst (33) has a GPF (41) capable of trapping fine exhaust particles in exhaust air, and a downstream catalyst (42) positioned downstream from the GPF (41). The GPF (41) can be supplied with secondary air. When an internal combustion engine (1) stops during travel a vehicle (1) supplies secondary air to the GPF (41) in which fine exhaust particles have accumulated. At that time the temperature of the GPF (41) is equal to or higher than a prescribed temperature. Thus, the under-floor catalyst (33) is able to control a reduction in the exhaust purification performance when the internal combustion engine (10) starts.