Lockup clutch slipping controlling method for automatic gearbox of vehicle, involves determining corrector coefficient by comparing slipping value and reference slipping value corresponding to nominal engine and turbine speeds

摘要

#CMT# #/CMT# The method involves sending aperture cyclic ratio values as a set point to a hydraulic pressure regulation solenoid valve of a lockup clutch, where an initial value of the ratio values is determined from parameters e.g. engine torque, issued from cartography. The initial value is a normal initial aperture cyclic ratio value corrected by a corrector coefficient. The coefficient is determined by comparing a slipping value (GR) representing slipping values measured during preceding gear shifting and theoretical reference slipping value corresponding to nominal engine and turbine speeds. #CMT#USE : #/CMT# Method for controlling slipping of a lockup clutch of a torque converter during gear shifting of an automatic gearbox in a vehicle. #CMT#ADVANTAGE : #/CMT# The method improves the quality of controlling of the clutch slipping at the starting of the gear shifting by sending the initial set point depending on engine and turbine speeds. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic representation of evolution of engine and turbine speeds during downward gear shifting. '(Drawing include non-English language text)' GR : Slipping value PT : Time period RMM : Measured engine speed RTC : Calculated turbine speed RTM : Measure turbine speed.