Tire air pressure detecting device
First Claim
1. A tire air pressure detecting device comprising:
- output means being installed on a vehicle, for outputting a signal including a vibration frequency component of a tire while said vehicle is moving;
extracting means for extracting a resonance frequency component from said signal including said tire vibration frequency component; and
detecting means for detecting a tire air pressure condition based on said resonance frequency component.
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Accused Products
Abstract
It is an object of the present invention to detect a tire air pressure indirectly with high detection precision.
A tire air pressure detecting device includes a speed sensor for outputting a signal corresponding to a rotational speed of a tire, and an electronic control unit which inputs the signal from the speed sensor and performs predetermined arithmetic operations on that signal. The electronic control unit calculates a wheel speed based on the output signal of the speed sensor, performs a frequency analysis for the calculated vehicle speed, and derives a resonance frequency corresponding to the unsprung mass in the vertical and longitudinal directions. The tire air pressure is then detected based on this resonance frequency.
37 Citations
24 Claims
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1. A tire air pressure detecting device comprising:
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output means being installed on a vehicle, for outputting a signal including a vibration frequency component of a tire while said vehicle is moving; extracting means for extracting a resonance frequency component from said signal including said tire vibration frequency component; and detecting means for detecting a tire air pressure condition based on said resonance frequency component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A tire air pressure detecting device comprising:
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output means being installed on a vehicle, for outputting a signal including a vibration frequency component of a tire while said vehicle is moving; extracting means for extracting a resonance frequency component from said output signal; storing means for storing at least a reference value, said reference value being based on a resonance frequency at normal tire air pressure; and detecting means for detecting a tire air pressure condition by comparing said extracted resonance frequency component with said stored reference value. - View Dependent Claims (22, 23)
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24. A tire air pressure detecting device comprising:
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output means being installed on a vehicle, for outputting a signal including a vibration frequency component of a tire while said vehicle is moving; extracting means for extracting a resonance frequency component from said output signal; and detecting means for detecting a tire air pressure condition based on said resonance frequency component of said signal, said detection being made independent of resonance frequency components corresponding to other tires on said vehicle.
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Specification