The invention relates to a method for controlling the speed of a heat engine (10) of a hybrid vehicle during a manual shift from an all-electric driving mode to a thermal rolling mode on a gear ratio selected by the driver. The vehicle comprises a manual gearbox (12) coupled by a clutch (11) to the engine (10). The method comprises detecting the manual passage on the gear ratio selected by the driver when the clutch (11) is configured in the open state, and in the case of detection of the manual passage, controlling the speed of the engine (10), from the start of the heat engine (10) and at the latest until the configuration of the clutch in the closed state, at a first setpoint controlled by an estimation value of the speed of the primary shaft of the gearbox ( 12).
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