Patent ID: 7704052
Filing Date: 2010-04-27
Classification: F04B

Abstract:
1. A method of controlling an air compressor, said air compressor including a tank portion for reserving compressed air used in a pneumatic tool, a compressed air generation portion for generating compressed air and supplying said compressed air to said tank portion, a drive portion including a motor for driving said compressed air generation portion, and a control circuit portion for controlling said drive portion, the method comprising: detecting pressure P of said compressed air reserved in said tank portion; storing a plurality of values indicating different rotational speeds of the motor; calculating a rate ΔP/ΔT between pressure change ΔP and time ΔT; selecting one of the values based on the pressure P of said tank portion and the rate ΔP/ΔT of pressure change; and controlling the rotational speed of said motor in accordance with the selected value.