To accurately calculate a torque inputted to a transmission without installing a plurality of rotational speed sensors on the same shaft within the transmission.
When the execution conditions of the initial processing, including the condition that the input shaft and the output shaft of the transmission are in a direct connection state (gear ratio is 1) are established (YES in S100), an ECU calculates, based on a pulse signal from an input shaft rotational speed sensor and a pulse signal from an output shaft rotational speed sensor during establishment of the initial conditions, an initial phase difference t indicating a phase difference of both pulse signals when the direct connection state is established and the input torque is zero (S102). When the direct connection state is thereafter held (YES in S104), the ECU calculates a value obtained by subtracting the initial phase difference t from an actual phase difference t of both pulse signals, as a twisted phase difference ta (S106). The ECU calculates an input torque T corresponding to the twisted phase difference ta by using a twist map previously storing the relation between the twisted phase difference and the input torque (S108).
Toshio Morita
Yutaka Horii
Nobuo Arakawa
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