Control method for hydrostatic type continuously variable...

F - Mech Eng,Light,Heat,Weapons – 16 – H

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F16H 59/24 (2006.01) F16H 59/36 (2006.01) F16H 61/42 (2006.01)

Patent

CA 2316475

An overtop position is to be established in a hydrostatic type continuously variable transmission, and an increase of the maximum speed and the maintenance of power performance are to be made compatible with each other. In a hydrostatic type continuously variable transmission, the angle of inclination of a movable swash plate is controlled in such a manner that a target Ne is calculated from both RC (riding condition) and throttle valve opening, then the target Ne thus calculated is compared with an actual Ne to determine a rotational direction and DUTY of a control motor, and the operation of the control motor is controlled in accordance with the thus-determined data and angle information on the angle of the movable swash plate provided from an angle sensor. In a constant speed vehicular traveling, the change gear ratio is set at TOP ratio and a shift is made to OVERTOP when predetermined overtop control conditions ((1) the current change gear ratio should be at TOP position, (2) the degree opening of a throttle valve should exceed a threshold value determined according to a vehicular speed, and (3) the engine speed should exceed a preset value) are satisfied, thereby increasing the maximum vehicle speed.

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