Monitoring device

A monitoring system configured to monitor a vehicle that travels through unattended operation using an electric motor as a power source, comprising:

• a camera that captures an image;
• a selection unit configured to:
• select which one of a first method and a second method to use to acquire a speed of the vehicle according to a status about the speed of the vehicle, the first method acquiring the speed of the vehicle using a detection value from a vehicle speed sensor that makes an output in synchronization with rotation of a wheel of the vehicle the second method of acquiring the speed of the vehicle using information about a rotational speed of the electric motor provided in the vehicle,
• select the first method if a predetermined condition indicating that a reliability degree of the detection value from the vehicle speed sensor is equal to or higher than a predetermined value is met, and
• select the second method if the predetermined condition is not met, and
• a speed acquisition unit configured to acquire the speed of the vehicle using the first method or the second method selected by the selection unit;
• a communication device mounted outside the vehicle that periodically receives the detection value from the vehicle speed sensor and the rotational speed of the electric motor from the vehicle;
• and
• a processor mounted in the vehicle that is configured to:
• if the first method is selected, set a control value for controlling the unattended operation of the vehicle that includes at least a target value for acceleration of the vehicle, and drive the vehicle based on the first control value, and
• if the second method is selected, set a control value for controlling the unattended operation of the vehicle that includes at least a target value for the speed of the vehicle, and drive the vehicle based on the second control value, and
• wherein the vehicle is configured to travel in a factory in which a plurality of manufacturing processes is executed in order to manufacture the vehicle,
• wherein the predetermined condition includes a travel speed of the vehicle being not limited in a present manufacturing process for the vehicle,
• wherein the monitoring system acquires a position of the vehicle by detecting an outer shape of the vehicle from the image, calculates coordinates of measurement points of the vehicle, and converts the calculated coordinates into coordinates in a global coordinate system, and
• wherein the outer shape of the vehicle included in the image is detected by inputting the image into a machine learning model and obtaining the outer shape from the machine learning model.