STEUERUNG FUER DAS UEBERSETZUNGSVERHAELTNIS EINES STUFENLOSEN ANTRIEBES.

摘要

A control system for a continuously variable transmission has a spool valve (50) for controlling the transmission ratio by controlling the supply of oil to a cylinder of a drive pulley, to change the transmission ratio. Control of the transmission ratio control valve (50) us determined in response to input and output speeds of the transmission, and engine load, in accordance with the difference between a desired transmission ratio and actual transmission ratio. The desired transmission ratio is determined in relation to a desired speed of input of the transmission, which is itself determined from a look-up table in response to engine load and actual transmission ratio.