US 5,726,353 A · System for detecting torque of automatic vehicle transmission and controlling the same based on detected torque

Abstract

The torque detection system for a continuously variable transmission for a vehicle having a dual-mass flywheel connecting an output of an engine mounted on the vehicle to the transmission and a start clutch for engaging/disengaging the transmitted power to the vehicle wheels. The dual-mass flywheel comprises of two flywheel components coupled by a torsion spring. Rotational speeds of the two flywheel components are detected and a phase angle therebetween is then calculated. A torque estimated to be input to the start clutch is determined by retrieving predetermined characteristics defining a static torque set with respect to the phase angle. When the vehicle is braked to stop in engine idling state, the clutch oil pressure is determined based on the calculated torque.

Claims22

Dependent claims

A system for detecting a torque in an automatic transmission mounted on a vehicle having an engine and wheels to be driven by power transmitted from the engine through the transmission;

wherein the improvement comprises:
a) an elastic coupling means connected to an output shaft of the engine;
b) detecting means for detecting a rotational speed input to the elastic coupling means;
c) detecting means for detecting a rotational speed output from the elastic coupling means;
d) a frictional engaging element provided for engaging/disengaging power transmitted from the engine to the wheels;
and
e) torque calculating means for calculating a first torque based on a difference between the detected rotational speeds when the frictional engaging element is in an engaged state and a second torque based on the difference between the detected rotational speeds when the frictional engaging element is in a disengaged state, to calculate a torque estimated to be actually input to the frictional engaging element based on the first torque and the second torque.
wherein said frictional engaging element is controlled to be engaged based upon the calculated torque of the elastic coupling means.

5 more elements

A system for detecting a torque in an automatic transmission mounted on a vehicle having an engine and wheels to be driven by power transmitted from the engine through the transmission;

wherein the improvement comprises:
a) a dual-mass flywheel connected to an output shaft of the engine and having a first flywheel component and a second flywheel component coupled by a torsion spring;
b) detecting means for detecting a rotational speed of the first flywheel component;
c) detecting means for detecting a rotational speed of the second flywheel component;
d) a start clutch provided for engaging/disengaging power transmitted to the wheels from the engine;
and
e) torque calculating means for calculating a first torque based on a difference between the detected rotational speeds when gears are in a driving range and a second torque based on the difference between the detected rotational speeds when the gears are in a no-driving range, to calculate a torque estimated to be actually input to the start clutch based on the first torque and the second torque, wherein the start clutch is controlled to be engaged based upon the calculated torque of the dual-mass flywheel.

4 more elements

Dependencies are inferred from the claim text.

System for detecting torque of automatic vehicle transmission and controlling the same based on detected torque

Life of this patent

System for detecting torque of automatic vehicle transmission and controlling the same based on detected torque

Life of this patent

Abstract

Claims22