Control method for hybrid vehicle and control device for hybrid vehicle

A control method for a hybrid vehicle comprising an engine with an engine throttle, a power generator that charges a battery using power of the engine, an electric motor that drives a driving wheel by electric power of the battery, and a particulate filter that collects particulate matter contained in exhaust gas from the engine, the control method comprising:

• controlling a motoring operation of rotating the engine at a first speed by the power generator to supply air to the particulate filter, by supplying electric power from the battery to the power generator, which comprises:
• upon determining that (i) particulate matter of a first predetermined amount or more is accumulated in the particulate filter and (ii) no brake negative pressure request has been made, performing the motoring operation with a throttle opening of the engine throttle in a first state,
• upon determining that (i) particulate matter of a first predetermined amount or more is accumulated in the particulate filter and (ii) a brake negative pressure request has been made, performing the motoring operation with the throttle opening of the engine throttle in a second state in which the throttle opening is narrower than in the first state,
• wherein the brake negative pressure request is a request to control the throttle opening of the engine throttle to increase intake negative pressure.