Torque Phase Shift Control Based on Clutch Torque Estimation

Abstract

An automatic transmission shift method is presented, in which the torque transfer phase is controlled in closed loop. This is made possible by real-time estimation of the torque transmitted by the off-going and on-coming clutches participating in the shift. Each clutch torque is determined based on measured or estimated input and output shaft torques and accelerations. To illustrate an application of the method, traditional friction elements are used to emulate one-way-clutch function during a power-on upshift.

Hydraulic clutch modeling for automotive control

“…Feedback is not available until the inertia transfer phase, which is sometime within Region 4 after the torque transfer phase completes, and a closed-loop control strategy using speed measurements can be used. In development vehicles, shaft torque sensors can be used to determine the clutch torque capacity, like in [9], which allows for limited feedback points to be used for tuning the model to the physical response.…”

Study on nonlinear dynamics characteristics of dual speed dual clutch transmission system based on bond graph

“…Newton Method [ 4 , 5 ], Lagrange equation [ 6 , 7 ], and bond graph methods [ 8 , 9 ] are often used to build models of transmission systems to transform a physical system into a differential equation. Compared with other methods, the bond graph theory can help researchers gain insights into the changes of multiple state variables in the system under different states reflecting the performance and dynamic characteristics of the system.…”

Unified modelling and control for the power-on gear shift of a planetary transmission

“…However, the timing and coordination control between the oncoming element and the offgoing element for clutch-slipping shifts to achieve a good shift quality are challenges. 3–11…”

“…Since speed-based shift control is incapable of being a closed-loop systen during the torque phase, gear-shift control is unstable because the diesel engine which is fitted to the heavy off-highway vehicle has a response lag in changing work conditions. The gear shift of the AT is performed with two friction elements which are driven by the oil hydraulic pressure, and good coordination between the oncoming element and the offgoing element ensures that the gear shift occurs without power interruption and oscillations; 3–11,15–19 hence, control of the pressure is critical and a closed-loop control strategy based on the pressure of the gear-shift elements is one of the effective ways of achieving a good shift quality. However, because of the cost, the installation and the reliability of the oil pressure sensor, measurement of the oil pressure is unrealistic in the transmission.…”