US 8,948,967 B2 · Apparatus and method for detecting conditions of tires for vehicle

Abstract

The present invention relates detecting the conditions of tires for a vehicle. In the present invention, signals are received from a plurality of wheel speed sensors, a reverse gear sensor, and a brake sensor. Errors of the wheel speed sensors are estimated using the received signals, a signal having a corrected error is obtained using the estimated errors, linear interpolation and band-pass filtering processing are performed on the signal, a tire resonant frequency is estimated using the processed signal, tire pressure is estimated based on the estimated resonant frequency, and whether or not to generate an alarm is determined based on the calculated tire pressure. Accordingly, there is an advantage in that whether or not pressure within a tire of a vehicle is abnormal can be determined in a cheap calculation device for a short time using a conventional wheel speed sensor.

Claims17

Dependent claims

An apparatus for detecting conditions of tires for a vehicle, comprising:

a plurality of wheel speed sensors configured to generate signals corresponding to rotation speeds of the tires;
a reverse gear sensor configured to generate a signal when a reverse gear operates;
a brake sensor configured to generate a signal when a brake pedal operates;
a control unit configured to receive the signals from the plurality of wheel speed sensors, the reverse gear sensor, and the brake sensor, calculate a signal error-corrected by estimating an error of a wheel speed sensor, perform linear interpolation and band-pass filtering processing on the calculated signal, estimate a tire resonant frequency, calculate estimated tire pressure based on the estimated resonant frequency, and determine whether or not generate an alarm based on the calculated estimated tire pressure;
and
an alarm device configured to inform a driver of an inappropriate condition of a tire based on the determination of the control unit.

3 more elements

A method for detecting conditions of tires for a vehicle, comprising:

a sensor signal collection step of receiving signals from a plurality of wheel speed sensors and operation sensors mounted on the vehicle and processing the received signals;
a sawtooth angle error estimation step of estimating sawtooth angle errors related to mechanical defects of the wheel speed sensors;
a wheel speed sensor error correction step of calculating a corrected sawtooth time and a corrected angular velocity of each of the wheel speed sensors using the estimated sawtooth angle errors;
a fixed time interpolation step of interpolating an angular velocity at a fixed time interval using the corrected sawtooth time and the corrected angular velocity;
a band-pass filtering step of filtering an interpolated signal in order to remove torsional vibration of a corresponding tire from the interpolated signal;
a frequency analysis step of estimating a vibration resonant frequency of the corresponding tire by counting stationary points from the filtered signal;
a vehicle speed correction step of correcting the vibration resonant frequency that is an output value of the frequency analysis step in order to compensate for an influence of a speed of the vehicle;
and
an alarm determination step of determining conditions of the corresponding tire by calculating pressure within the corresponding tire based on the frequency corrected in the vehicle speed correction step.

6 more elements

Dependencies are inferred from the claim text.

Apparatus and method for detecting conditions of tires for vehicle

Life of this patent

Apparatus and method for detecting conditions of tires for vehicle

Life of this patent

Abstract

Claims17