Method of controlling clutch for fluid torque converter in...

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

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74/168

F16D 47/02 (2006.01) F16H 61/14 (2006.01) F16H 59/18 (2006.01) F16H 59/44 (2006.01)

Patent

CA 1273505

176/254 ABSTRACT OF THE DISCLOSURE A vehicular transmission having a fluid torque converter of the type in which a clutch is provided for mechanically connect- ing the input and output sides of a fluid torque converter above certain vehicle speeds for improved operation and economy and in which the clutch is operated within a predetermined vehicular speed range by such a relatively low engaging force as to allow slippage of said clutch for minimizing vibration. A control system causes the engaging force of the clutch to be increased more than that which is normally established below a reference valve of small throttle valve opening for providing a braking effect by the engine. The control system also may provide for stopping the increase in engaging force at small throttle valve openings when the r.p.m. of the output side of the fluid torque converter falls below the r.p.m. at the input side, such as during a transition from a steep down- ward slope to a gentle downward slope, or when low oil temperature and high oil viscosity would cause operation too abruptly.

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