Estimation method and apparatus of tire dynamic state amount and tire with sensors

An estimation apparatus of a tire dynamic state amount comprising;

• tire deformation amount detection means for measuring the amount of deformation of the tire, installed at two or more positions on almost the same cross-section in the radial direction of the tire at the inner surface of the inner liner portion of a tire tread or between the belt portion and the inner liner portion of the tire;
• a wheel speed sensor for detecting the wheel speed of the tire;
• contact time detection means for detecting the contact time of the tire based on the temporal waveform of the amount of deformation of the tire detected by the tire deformation amount measuring means, or the temporal waveform of a differential value obtained by time differentiating the amount of deformation, or the temporal waveform of an integrated value obtained by time integrating the amount of deformation;
• contact length index calculating means for calculating the indices of contact length from the contact time and the wheel speed detected by the wheel speed sensor;
• means of calculating the average value of the indices of contact length;
• memory means for storing a map showing the relationship between the average value of the indices of contact length and load;
• and
• load estimation means for estimating a load applied to the tire by using the calculated average value of the indices of contact length and the map.

An estimation apparatus of a tire dynamic state amount comprising;

• tire deformation amount detection means for measuring the amount of deformation of the tire, installed at two or more positions on almost the same cross-section in the radial direction of the tire at the inner surface of the inner liner portion of a tire tread or between the belt portion and the inner liner portion of the tire;
• a wheel speed sensor for detecting the wheel speed of the tire;
• means of detecting the time between deformation points outside the contact patch of the tire based on the temporal waveform of the amount of deformation of the tire detected by the tire deformation amount measuring means, the temporal waveform of a differential value obtained by time differentiating the amount of deformation, or the temporal waveform of an integrated value obtained by time integrating the amount of deformation;
• means of calculating the indices of deformation length outside the contact patch from the time between deformation points outside the contact patch and the wheel speed detected by the wheel speed sensor;
• means of calculating the average value of the indices of deformation length outside the contact patch;
• memory means for storing a map showing the relationship between the average value of the indices of deformation length outside the contact patch and load;
• and
• load estimation means for estimating a load applied to the tire by using the calculated average value of the indices of deformation length outside the contact patch and the map.

An estimation apparatus of a tire dynamic state amount comprising;

• tire deformation amount detection means for measuring the amount of deformation of the tire, installed at two or more positions on almost the same cross-section in the radial direction of the tire at the inner surface of the inner liner portion of a tire tread or between the belt portion and the inner liner portion of the tire;
• a wheel speed sensor for detecting the wheel speed of the tire;
• contact time detection means for detecting the contact time of the tire based on the temporal waveform of the amount of deformation of the tire detected by the tire deformation amount measuring means, the temporal waveform of a differential value obtained by time differentiating the amount of deformation, or the temporal waveform of an integrated value obtained by time integrating the amount of deformation;
• contact length index calculating means for calculating the indices of contact length from the contact time and the wheel speed detected by the wheel speed sensor;
• means of calculating the ratio of the indices of contact length;
• memory means for storing a map showing the relationship between the ratio of the indices of contact length and lateral force;
• and
• lateral force estimation means for estimating lateral force generated in the tire by using the ratio of the indices of contact length and the map.

An estimation apparatus of a tire dynamic state amount comprising;

• tire deformation amount detection means for measuring the amount of deformation of the tire, installed at two or more positions on almost the same cross-section in the radial direction of the tire at the inner surface of the inner liner portion of a tire tread or between the belt portion and the inner liner portion of the tire;
• a wheel speed sensor for detecting the wheel speed of the tire;
• means of detecting the time between deformation points outside the contact patch of the tire based on the temporal waveform of the amount of deformation of the tire detected by the tire deformation amount measuring means, the temporal waveform of a differential value obtained by time differentiating the amount of deformation, or the temporal waveform of an integrated value obtained by time integrating the amount of deformation to calculate the indices of deformation length outside the contact patch by multiplying the detected time between deformation points outside the contact patch by the wheel speed;
• means of calculating the ratio of the indices of deformation length outside the contact patch;
• memory means for storing a map showing the relationship between the ratio of the indices of deformation length outside the contact patch and the ratio of the indices of contact length and the camber angle and a correction map for compensating lateral force according to the camber angle;
• and
• lateral force estimation means for estimating lateral force generated in the tire by using the ratio of the indices of deformation length outside the contact patch, the ratio of the indices of contact length and the maps.

An estimation apparatus of a tire dynamic state amount comprising;

• tire deformation amount detection means for measuring the amount of deformation of the tire, installed at two or more positions on almost the same cross-section in the radial direction of the tire at the inner surface of the inner liner portion of a tire tread or between the belt portion and the inner liner portion of the tire;
• a wheel speed sensor for detecting the wheel speed of the tire;
• contact time detection means for detecting the contact time of the tire based on the temporal waveform of the amount of deformation of the tire detected by the tire deformation amount measuring means, the temporal waveform of a differential value obtained by time differentiating the amount of deformation, or the temporal waveform of an integrated value obtained by time integrating the amount of deformation;
• contact length index calculating means for calculating the indices of contact length from the contact time and the wheel speed detected by the wheel speed sensor;
• means of calculating the difference between the indices of contact length;
• memory means for storing a map showing the relationship between the difference between the indices of contact length and lateral force;
• and
• lateral force estimation means for estimating lateral force generated in the tire by using the difference between the indices of contact length and the map.

An estimation apparatus of a tire dynamic state amount comprising;

• tire deformation amount detection means for measuring the amount of deformation of the tire, installed at two or more positions on almost the same cross-section in the radial direction of the tire at the inner surface of the inner liner portion of a tire tread or between the belt portion and the inner liner portion of the tire;
• a wheel speed sensor for detecting the wheel speed of the tire;
• means of detecting the amount of deformation at deformation points outside the contact patch of the tire based on the temporal waveform of the amount of deformation of the tire detected by the tire deformation amount measuring means, the temporal waveform of a differential value obtained by time differentiating the amount of deformation, or the temporal waveform of an integrated value obtained by time integrating the amount of deformation;
• means of calculating the ratio of the amounts of deformation at deformation points outside the contact patch, which are located before and after the contact patch;
• memory means for storing a map showing the relationship between the ratio of the amounts of deformation at deformation points outside the contact patch and longitudinal force;
• and longitudinal force estimation means for estimating longitudinal forced applied to the tire by using the amount of deformation at deformation points outside the contact patch and the map.

An estimation apparatus of a tire dynamic state amount comprising;

• tire deformation amount detection means for measuring the amount of deformation of the tire, installed at two or more positions on almost the same cross-section in the radial direction of the tire at the inner surface of the inner liner portion of a tire tread or between the belt portion and the inner liner portion of the tire;
• a wheel speed sensor for detecting the wheel speed of the tire;
• means of detecting the time between a deformation point outside the contact patch on the leading edge side of the tire and the contact end on the leading edge side based on the temporal waveform of the amount of deformation of the tire detected by the tire deformation amount measuring means, the temporal waveform of a differential value obtained by time differentiating the amount of deformation, or the temporal waveform of an integrated value obtained by time integrating the amount of deformation;
• means of detecting the time between a deformation point outside the contact patch on the trailing edge side of the tire and the contact end on the trailing edge side;
• means of calculating the length of deformation on the leading edge side and the length of deformation on the trailing edge side by multiplying the time between the deformation point outside the contact patch on the leading edge side of the tire and the contact end on the leading edge side and the time between the deformation point outside the contact patch on the trailing edge side of the tire and the contact end on the trailing edge side by the wheel speed detected by the wheel speed sensor, respectively, to compute the ratio of the length of deformation on the leading edge side to the length of deformation on the trailing edge side;
• memory means for storing a map showing the relationship between the ratio of the length of deformation on the leading edge side to the length of deformation on the trailing edge side and longitudinal force;
• and
• longitudinal force estimation means for estimating longitudinal force applied to the tire by using the ratio of the length of deformation on the leading edge side to the length of deformation on the trailing edge side and the map.