WHEEL DIAMETER VARIATION-DETECTING DEVICE
First Claim
1. A wheel diameter variation-detecting device for detecting variation in diameter between a plurality of wheels of a vehicle, the wheels rotating independently of each other, comprising:
- wheel rotational speed sensors that detect rotational speeds of the wheels, respectively;
variation parameter-calculating means for calculating a variation parameter indicative of variation in diameter between the wheels, using one of the wheels as a reference wheel, based on a result of comparison between a detected rotational speed of the reference wheel and a detected rotational speed of another wheel;
travelled distance-detecting means for detecting a travelled distance of the vehicle; and
variation parameter-learning means for learning the variation parameter based on a value obtained by averaging a plurality of values of the variation parameter obtained before the detected travelled distance reaches a predetermined distance.
1 Assignment
0 Petitions
Accused Products
Abstract
There is provided a wheel diameter variation-detecting device which is capable of properly detecting relative variation in diameter between a plurality of wheels of a vehicle. The wheel diameter variation-detecting device 1 for detecting variation in diameter between a plurality of wheels WFL, WFR, WRL, WRR of a vehicle V which rotate independently of each other detects rotational speeds NFL, NFR, NRL, NRR of the respective wheels WFL, WFR, WRL, WRR, and calculates a variation parameter RDR indicative of variation in diameter between the wheels WFL, WFR, WRL, WRR, using one of the wheels WFL, WFR, WRL, WRR as a reference wheel WRL, based on a result of comparison between the rotational speed NRL, NRR of the reference wheel and that of one of the wheels other than the reference wheel (step 3). Further, the wheel diameter variation-detecting device learns the variation parameter based on a value obtained by averaging a plurality of values of the variation parameter RDR obtained before the detected travelled distance DISSUM reaches a predetermined distance DIS2 (steps 4, 31 to 33, 36, 44).
-
Citations
4 Claims
-
1. A wheel diameter variation-detecting device for detecting variation in diameter between a plurality of wheels of a vehicle, the wheels rotating independently of each other, comprising:
-
wheel rotational speed sensors that detect rotational speeds of the wheels, respectively; variation parameter-calculating means for calculating a variation parameter indicative of variation in diameter between the wheels, using one of the wheels as a reference wheel, based on a result of comparison between a detected rotational speed of the reference wheel and a detected rotational speed of another wheel; travelled distance-detecting means for detecting a travelled distance of the vehicle; and variation parameter-learning means for learning the variation parameter based on a value obtained by averaging a plurality of values of the variation parameter obtained before the detected travelled distance reaches a predetermined distance. - View Dependent Claims (2, 3, 4)
-
Specification