BELT-BASED CONTINUOUSLY VARIABLE TRANSMISSION CONTROL DEVICE AND CONTROL METHOD

摘要

Disclosed are a belt-based continuously variable transmission control device and control method, which can collectively improve energy conservation efficiency and control vehicle vibration by controlling belt slippage, and ensure belt slippage detectability by setting the vibration amplitude according to the transmission gear ratio at which belt slip control is being performed. Comprising a primary pulley (42), a secondary pulley (43) and a belt (44), the transmission gear ratio is controlled by the ratio of the pulley wrap radius of the belt (44) by controlling a primary hydraulic pressure and a secondary hydraulic pressure. The belt-based continuously variable transmission mechanism (4) is equipped with a belt slippage control means (Figure 8), which vibrates a secondary hydraulic pressure, estimates belt slippage by monitoring the phase difference ? between the vibration component included in the actual secondary hydraulic pressure and the vibration component included in the actual transmission gear ratio, and performs control to reduce the actual secondary hydraulic pressure to maintain a specified belt slippage based on the estimate, and with a vibration amplitude setting means (sine wave vibrator 93a), which, when the belt slippage is controlled and the secondary hydraulic pressure is vibrated, compares the vibration amplitude of the secondary hydraulic pressure at a high gear ratio with that at a low gear ratio and reduces it.