Image forming apparatus and method conditionally estimating remaining toner using correction information

An image forming apparatus, to which a toner cartridge is mountable, the image forming apparatus comprising:

• a printer that forms an image on a sheet with a toner;
• a motor that supplies toner from the toner cartridge to the printer;
• a storage that stores correction information regarding correction of a supplied amount of the toner from the toner cartridge and the remaining amount of the toner in the toner cartridge;
• and
• a controller which
• acquires driving information regarding driving of the motor,
• acquires the correction information in accordance with the remaining amount of the toner in the toner cartridge,
• estimates the remaining amount of the toner in the toner cartridge based on the driving information and the correction information when the remaining amount of the toner in the toner cartridge stored in the storage satisfies a predetermined condition regarding the remaining amount, and
• estimates the remaining amount of the toner in the toner cartridge based on the driving information when the remaining amount of the toner in the toner cartridge stored in the storage does not satisfy the predetermined condition.

A method performed by an image forming apparatus, comprising:

• acquiring driving information regarding driving of a motor configured to supply toner from a toner cartridge to a printer;
• acquiring correction information in accordance with a remaining amount of the toner in the toner cartridge;
• estimating the remaining amount of the toner in the toner cartridge based on the driving information and the correction information when the remaining amount of the toner in the toner cartridge stored in a storage satisfies a predetermined condition regarding the remaining amount;
• and
• estimating the remaining amount of the toner in the toner cartridge based on the driving information when the remaining amount of the toner in the toner cartridge stored in the storage does not satisfy the predetermined condition.