| 摘要 |
<p>A variator 10 has a pair of races (12, 14, 26, Figure 1) and at least one roller (28, Figure 1) which is arranged to engage both races and to transfer drive from one to the other. A traction control arrangement has a traction control valve 119 which controls the traction load pressure and which is operable in at least two modes: In a first mode, it receives (a) a first pilot pressure signal corresponding to the traction load pressure and (b) a second pilot pressure signal corresponding to the higher of the first and second reaction pressures, and controls the traction load pressure in response to the difference between the first and second signals. In a second mode, it receives (a) a first pilot pressure signal corresponding to the traction load pressure, (b) a second pilot pressure signal corresponding to the higher of the first and second reaction pressures, and (c) a third pilot pressure signal corresponding to the lower of the first and second reaction pressures, and controls the traction load pressure as a function of the first, second and third pilot pressure signals.</p> |
