| 摘要 |
<p>In a power transmission for vehicles having a wet multiple disk clutch and performing the transmission/nontransmission of power by a clutch control device during gear shifting, the half-clutch engagement amount is accurately learned. When the clutch control device for the wet multiple disk clutch starts to learn the engagement amount at the half clutch start point, a clutch piston driven by a hydraulic oil for changing the engagement amount is moved throughout the entire stroke, and immediately after the movement, the half-clutch engagement amount is detected. Since the hydraulic oil present between the friction plates of the wet multiple disk clutch is discharged by the movement of the clutch piston and replaced with a new hydraulic oil, a detection error resulting from a variation in the temperature of the hydraulic oil can be avoided, and the instable operation of the clutch piston due to the static friction with a large resistance can be solved. The engagement amount at the half clutch start point is determined by gradually increasing the engagement amount after disengaging the clutch and detecting a variation in the rotational speed of the clutch input shaft.</p> |
