Vehicle machine control method and device and vehicle machine

The invention relates to a vehicle-mounted terminal control method and device and a vehicle-mounted terminal. The method comprises the steps that an air pressure value in the vehicle-mounted terminal is monitored through a sensing device arranged in the vehicle-mounted terminal; according to the change of the air pressure value, whether pressing operation occurs in a designated area on the vehicle-mounted information entertainment product or not is determined, and the designated area is located on a shell of the vehicle-mounted information entertainment product; and in response to determining that the pressing operation occurs in the designated area on the vehicle-mounted device, controlling the vehicle-mounted device to execute a corresponding vehicle-mounted device control instruction. Therefore, the convenience of user experience can be improved, and the situation that the driving risk of the vehicle is increased due to the fact that the user is distracted from vehicle control in the driving process can be