Abstract: A device to accurately identify the wheel position where each tire has a radio wave transmitter installed without special means or operation during application by using a simple and compact configuration. This TPMS has sensor modules 14A, 14B, 14C, 14D on the transmission side equipped by tires 12FL, 12FR, 12RL, 12RR installed on automobile 10 and main device 16 on the receiving side loaded in automobile 10. Main device 16 is comprised of a group of two antennas 18, 20, receiver 22, and display 24. Two antennas 18, 20 are arranged appropriately to receive the radio waves transmitted by each of sensor modules 14A-14D with a phase difference between them.

Abstract: A method for determining whether a tire is in rotation is provided. A measured acceleration is compared to a first threshold after a first timer indicates that a first period has lapsed, and indication that the tire is in rotation is provided if at least one of the measured accelerations is greater than the first threshold. If an absolute difference between consecutive measured accelerations is greater than a second threshold, an indication that the tire is in rotation is also provided. Additionally, the second timer is started if the absolute difference is greater than the second threshold and if a second timer is not running, and indication that the tire is rotating is provided if the absolute difference is less than a predetermined threshold and if the second timer is running.

Abstract: A device to accurately identify the wheel position where each tire has a radio wave transmitter installed without special means or operation during application by using a simple and compact configuration. This TPMS has sensor modules 14A, 14B, 14C, 14D on the transmission side equipped by tires 12FL, 12FR, 12RL, 12RR installed on automobile 10 and main device 16 on the receiving side loaded in automobile 10. Main device 16 is comprised of a group of two antennas 18, 20, receiver 22, and display 24. Two antennas 18, 20 are arranged appropriately to receive the radio waves transmitted by each of sensor modules 14A-14D with a phase difference between them.

Abstract: A method for determining whether a tire is in rotation is provided. A measured acceleration is compared to a first threshold after a first timer indicates that a first period has lapsed, and indication that the tire is in rotation is provided if at least one of the measured accelerations is greater than the first threshold. If an absolute difference between consecutive measured accelerations is greater than a second threshold, an indication that the tire is in rotation is also provided. Additionally, the second timer is started if the absolute difference is greater than the second threshold and if a second timer is not running, and indication that the tire is rotating is provided if the absolute difference is less than a predetermined threshold and if the second timer is running.

Abstract: A sewing machine control circuit is disclosed in which acceleration or deceleration of the machine is effected by the operator in such a way as to gradually increase or decrease motor speed during periods of operator intervention and to maintain whatever speed exists at the time operator intervention ceases. Improved circuitry is utilized to perform these functions.