关键词: 应变片；夹紧力；软件标定；无级自动变速器

Abstract: For continuously variable transmission (CVT), steel belt slipping is one of the common forms of failure. To avoid slipping of the steel belt, the clamping force calibration of CVT is an important part of transmission control unit (TCU) software calibration. The clamping force is mainly calculated based on engine torque. In view of the deviation between the torque signal sent by the engine to the TCU of CVT via controller area network (CAN) and the actual torque value transmitted to the clutch, and the CVT is not equipped with a torque sensor acquisition system based on cost consideration to cause calculation deviation of clamping force without the actual engine input torque. In this paper, strain gauges are creatively arranged in CVT to collect actual engine input torque, to support accurate control and calibration of clamping force, and get input torque offset map finally, effectively improving the lifetime of steel belts and the transmission efficiency.

Key words: Strain gauge; Clamping force; Software calibration; Continuously variable transmission