초록 ▼

In a continuously variable speed transmission having a hydraulic pump, a hydraulic motor, a hydraulic closed circuit hydraulically connecting the pump with the motor, a control apparatus has a slip sensor for detecting slip of the driving wheels and a hydraulic control apparatus for lowering hydraul

In a continuously variable speed transmission having a hydraulic pump, a hydraulic motor, a hydraulic closed circuit hydraulically connecting the pump with the motor, a control apparatus has a slip sensor for detecting slip of the driving wheels and a hydraulic control apparatus for lowering hydraulic pressure in the hydraulic closed circuit in accordance with magnitude of the slip of the wheels in such a way that the driving force of the driving wheels is reduced so as to be less than a slip limit force, the slip of the driving wheels being increased when the driving force applied to the driving wheels exceeds the slip limit force.

대표청구항 ▼

A control apparatus for a continuously variable speed transmission for a vehicle having a hydraulic pump connected to an engine, a hydraulic motor connected to driving wheels, and a hydraulic closed circuit hydraulically connecting said hydraulic pump with said hydraulic motor, said hydraulic closed

A control apparatus for a continuously variable speed transmission for a vehicle having a hydraulic pump connected to an engine, a hydraulic motor connected to driving wheels, and a hydraulic closed circuit hydraulically connecting said hydraulic pump with said hydraulic motor, said hydraulic closed circuit comprising a first hydraulic line through which a delivery port of said pump communicates with a suction port of said motor and a second hydraulic line through which a suction port of said pump communicates with a delivery port of said motor, at least one of said hydraulic pump and said hydraulic motor being a variable displacement type, the control apparatus comprising: a slip detecting means for detecting slip of the driving wheels driven by said hydraulic motor, and hydraulic control means for lowering hydraulic pressure in said hydraulic closed circuit in accordance with a magnitude of the slip detected by said slip detecting means, in such a way that driving force applied to said driving wheels is reduced so as to be less than a slip limit force, the slip of said driving wheels being increased when the driving force applied to said driving wheels exceeds said slip limit force.