Tire pressure reduction detection device, pressure reduction detection method, and pressure reduction detection program product

Abstract

The invention provides a pressure reduction detection device, a pressure reduction detection method, and a pressure reduction detection program product for a tire capable of appropriately distinguishing coaxial two-wheel pressure reduction and four-wheel pressure reduction. A tire pressure reduction detection device is provided with an acquisition unit, an index calculation unit, a pressure reduction determination unit, a resonance frequency determination unit, and a derivation unit. When the equivalent amount of pressure reduction in the first right tire and the equivalent amount of pressure reduction in the first left tire are both equal to or greater than a predetermined first threshold value and the difference between the equivalent amount of pressure reduction in the first right tire and the equivalent amount of pressure reduction in the first left tire is less than a predetermined second threshold value, the tire pressure reduction control unit controls the tire pressure reduction control unit. The pressure reduction determination unit determines whether or not a second right tire and a second left tire have occurred on the basis of a relative pressure reduction index that compares the rotational speeds of the second right tire and the second left tire attached to a second axle of the vehicle with the rotational speeds of the first right tire and the first left tire among the relative pressure reduction indexes. And reducing pressure.

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