Method of controlling continuously variable transmission

Abstract

Abstract PURPOSE:To make it possible to easily exhibit an operating characteristic required by the driver by determining an optimum desired rotational speed among first, second desired rotational speeds and the like in accordance with detection signals from a throttle valve opening degree sensor and a vehicle speed sensor, and by controlling the gear shift operation in accordance with the optimum desired rotational speed. CONSTITUTION:A belt drive type continuously variable transmission 2 is composed of a primary pressure control valve 34 as a speed change control valve, a constant pressure control valve 38, a line pressure control valve 44 and a clutch pressure control valve 52 in a hydraulic circuit, and the valves 34, 44, 52 are controlled by a control section 82 through solenoid valves 42, 50, 58, respectively. In this arrangement, the control section 82 obtains a first desired rotational speed N1 in accordance with a throttle opening degree signal and a second desired rotational speed N2 in accordance with a vehicle speed signal, and determines an optimum desired engine rotational speed N in accordance with these rotational speeds N1, N2 and a rotational speed limiting instruction relating to a shift position. Further, the speed change control solenoid valve 42 is controlled in accordance with the rotational speed N, thereby it is possible to exhibit satisfactory accelerating performance and engine brake effect.

Inventors

• 👤 Sadayuki Hirano
• 👤 Katsuaki Murano
• 👤 Yoshinobu Yamashita
• 👤 Takumi Tatsumi
• 👤 Hiroaki Yamamoto

Bibliographic Details