Vehicle speed determination system, stability control system, and saddled vehicle having the same
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorYoshimichi Seki
Life of this patent
Estimating the term…
Abstract
A vehicle speed while curving through steering maneuver is determined. A vehicle speed determination system is applicable to a vehicle having a front wheel and a rear wheel. The system includes: a wheel speed sensor configured to detect a wheel speed Vf of the front wheel; and an arithmetic circuit configured to determine a vehicle speed V(r) at a rear-wheel tangential point, based on a difference in vehicle speed between the front-wheel tangential point and the rear-wheel tangential point which occurs due to a difference between a locus of travel of the front wheel and a locus of travel of the rear wheel, and on the wheel speed Vf of the front wheel.
Claims19
A vehicle speed determination system for a vehicle having a front wheel and a rear wheel, comprising:
- a wheel speed sensor configured to detect a wheel speed of the front wheel;
- and
- an arithmetic circuit configured to determine an expected vehicle speed at a rear-wheel tangential point, based on
- the wheel speed of the front wheel, and
- an expected difference in vehicle speed between a front-wheel tangential point and the rear-wheel tangential point due to a difference between a locus of travel of the front wheel and a locus of travel of the rear wheel,
- wherein the arithmetic circuit determines the expected difference in the vehicle speed between the front-wheel tangential point and the rear-wheel tangential point based on a yaw rate of the vehicle.
A stability control system for a vehicle having a front wheel and a rear wheel, the stability control system comprising:
- a first wheel speed sensor configured to detect a wheel speed of the front wheel;
- a second wheel speed sensor configured to detect a wheel speed of the rear wheel;
- an arithmetic circuit configured to determine a vehicle speed at a front-wheel tangential point and a vehicle speed at a rear-wheel tangential point, based on
- the wheel speed of the front wheel,
- a difference in vehicle speed between the front-wheel tangential point and the rear-wheel tangential point due to a difference between a locus of travel of the front wheel and a locus of travel of the rear wheel;
- and
- a longitudinal force controller configured to adjust an absolute value of a longitudinal force based on the vehicle speeds at the front-wheel tangential point and the rear-wheel tangential point, the longitudinal force being a sum of forces along a front-rear direction of the vehicle acting on the front wheel or the rear wheel.
A vehicle speed determination method for a vehicle having a front wheel and a rear wheel, the method comprising:
- detecting a wheel speed of the front wheel;
- and
- determining an expected vehicle speed at a rear-wheel tangential point, based on
- the wheel speed of the front wheel, and
- an expected difference in vehicle speed between a front-wheel tangential point and the rear-wheel tangential point due to a difference between a locus of travel of the front wheel and a locus of travel of the rear wheel,
- wherein the expected difference in the vehicle speed between the front-wheel tangential point and the rear-wheel tangential point is based on a yaw rate of the vehicle.
Dependencies are inferred from the claim text.