TRANSMISSION AND CONTROL METHOD OF TRANSMISSION (as amended)

A transmission, comprising:

• a variator capable of continuously changing a speed ratio;
• a stepped transmission mechanism arranged in series with the variator and in which a gear position is switched;
• and
• a controller adapted to control a through speed ratio by controlling the variator and the stepped transmission mechanism and to execute stepped shifting by performing repeatedly a shifting suppression phase and an upshift phase if a stepped upshift shifting condition is satisfied, the through speed ratio being a speed ratio as the entire transmission, a change of the through speed ratio being suppressed in the shifting suppression phase, a change of the through speed ratio of the upshift phase being larger than that of the shifting suppression phase, wherein
• if the stepped shifting is not performed, on the basis of a first gear position switching line where the stepped transmission mechanism is at an n-th gear position and a speed ratio of the variator is a Highest speed ratio, the controller performs shifting from the n-th gear position to an n+1 gear position;
• if the stepped transmission mechanism is at the n-th gear position when the stepped shifting is performed, the controller starts a change from the n-th gear position to the n+1 gear position on the basis of a second gear position switching line, the second gear position switching line being set on a Low side by a change rate or more of a speed ratio in the upshift phase with respect to a Highest speed ratio of the variator at the n-th gear position;
• and
• the change from the n-th gear position to the n+1 gear position of the stepped transmission mechanism is completed before the through speed ratio reaches the Highest speed ratio of the variator.

A control method adapted to control a transmission provided with:

• a variator capable of continuously changing a speed ratio;
• and
• a stepped transmission mechanism arranged in series with the variator and in which a gear position is switched, the control method comprising:
• controlling a through speed ratio by controlling the variator and the stepped transmission mechanism, the through speed ratio being a speed ratio as the entire transmission;
• executing stepped shifting adapted to repeatedly perform a shifting suppression phase and an upshift phase if a stepped upshift shifting condition is satisfied, a change of the through speed ratio being suppressed in the shifting suppression phase, a change of the through speed ratio of the upshift phase being larger than that of the shifting suppression phase;
• if the stepped shifting is not performed, on the basis of a first gear position switching line where the stepped transmission mechanism is at an n-th gear position and a speed ratio of the variator is a Highest speed ratio, performing shifting from the n-th gear position to an n+1 gear position;
• if the stepped transmission mechanism is at the n-th gear position when the stepped shifting is performed, starting a change from the n-th gear position to the n+1 gear position on the basis of a second gear position switching line, the second gear position switching line being set on a Low side by a change rate or more of a speed ratio in the upshift phase with respect to a Highest speed ratio of the variator at the n-th gear position;
• and
• completing the change from the n-th gear position to the n+1 gear position of the stepped transmission mechanism before the through speed ratio reaches the Highest speed ratio of the variator.

A transmission, comprising:

• a variator capable of continuously changing a speed ratio;
• a stepped transmission mechanism arranged in series with the variator and in which a gear position is switched;
• and
• shifting control means for controlling a through speed ratio by controlling the variator and the stepped transmission mechanism and for executing stepped shifting by performing repeatedly a shifting suppression phase and an upshift phase if a stepped upshift shifting condition is satisfied, the through speed ratio being a speed ratio as the entire transmission, a change of the through speed ratio being suppressed in the shifting suppression phase, a change of the through speed ratio of the upshift phase being larger than that of the shifting suppression phase, wherein
• if the stepped shifting is not performed, on the basis of a first gear position switching line where the stepped transmission mechanism is at an n-th gear position and a speed ratio of the variator is a Highest speed ratio, the shifting control means performs shifting from the n-th gear position to an n+1 gear position;
• if the stepped transmission mechanism is at the n-th gear position when the stepped shifting is performed, the shifting control means starts a change from the n-th gear position to the n+1 gear position on the basis of a second gear position switching line, the second gear position switching line being set on a Low side by a change rate or more of a speed ratio in the upshift phase with respect to a Highest speed ratio of the variator at the n-th gear position;
• and
• the change from the n-th gear position to the n+1 gear position of the stepped transmission mechanism is completed before the through speed ratio reaches the Highest speed ratio of the variator.