Abstract
This paper presents an experimental investigation into the transient torsional response of a powertrain fitted with an automatic transmission under various operating conditions. The powertrain test facility is briefly described along with the development of a wireless torque transducer. A number of tests are performed including engine torque tip-in and 1-2 and 2-3 automatic transmission gearshifts. The transient output torque of the transmission is measured and analysed. We discuss some quantifiers for the system response during torque ramps and torque and inertia phases of gear shifts. Clearance induced impact (clunk) events due to torque reversals are captured in acceleration measurements during engine torque tip-in from engine idle and examined in the time and frequency domain.
Keywords:Powertrain dynamics, driveline dynamics, gear shift quality, clunk, transient response, automotive test rigs