초록 ▼

A transmission incorporating a continuously variable ratio unit connected to further gearing, such that a plurality of regimes are available with synchronous shifting between regimes, is controlled such that to avoid hunting between regimes when the transmission is running at or around the synchrono

A transmission incorporating a continuously variable ratio unit connected to further gearing, such that a plurality of regimes are available with synchronous shifting between regimes, is controlled such that to avoid hunting between regimes when the transmission is running at or around the synchronous ratio, regime and ratio changing beyond the synchronous ratio is inhibited until the optimum ratio for the prevailing operating conditions differs from the synchronous by a predetermined value.

대표청구항 ▼

In a transmission of the type having a continuously variable ratio unit, further gearing, clutch means for operating the transmission in two regimes with synchronous shifting between the regimes, and control means for varying the transmission ratio according to a predetermined control strategy ratio

In a transmission of the type having a continuously variable ratio unit, further gearing, clutch means for operating the transmission in two regimes with synchronous shifting between the regimes, and control means for varying the transmission ratio according to a predetermined control strategy ratio in dependence on load and engine speed, the improvement comprising, means to inhibit regime changing from the synchronous ratio until the synchronous ratio differs from the predetermined control strategy ratio by at least a predetermined value.