Abstract: Early detection of an abnormality in a vehicle speed detection system. A continuously variable transmission (CVT) has an input shaft connected to an engine and an output shaft connected to a rear wheel. A change-gear ratio between the input and output shafts is electronically controlled. The vehicle speed detection system outputs a vehicle speed signal. An electronic control unit (ECU) detects an abnormality in the vehicle speed detection system based on at least one of a rotational speed of the engine, a rotational speed of the input shaft, and a rotational speed of the output shaft, as well as based on the vehicle speed signal outputted from the vehicle speed detection system.

Abstract: A continuously-variable-transmission control device having high control response and stability, reduced processing load on a control device and V-belt wear recognition. The width of the V-belt is calculated on the basis of a position of the primary sheave, a length of the V-belt, a distance between the sheaves, an angle of the sheave, and a change gear ratio during idling, and the calculated belt width is stored. The control device performs a feed-forward control on the starter in which it corrects the target position of the primary sheave on the basis of the belt width, and then controls the sheave position so as to reach the corrected target position. When the calculated belt width becomes equal to or smaller than a predetermined threshold, the control device issues an alarm that alerts the driver to replace the V-belt.

Abstract: Early detection of an abnormality in a vehicle speed detection system. A continuously variable transmission (CVT) has an input shaft connected to an engine and an output shaft connected to a rear wheel. A change-gear ratio between the input and output shafts is electronically controlled. The vehicle speed detection system outputs a vehicle speed signal. An electronic control unit (ECU) detects an abnormality in the vehicle speed detection system based on at least one of a rotational speed of the engine, a rotational speed of the input shaft, and a rotational speed of the output shaft, as well as based on the vehicle speed signal outputted from the vehicle speed detection system.

Abstract: A continuously-variable-transmission control device having high control response and stability, reduced processing load on a control device and V-belt wear recognition. The width of the V-belt is calculated on the basis of a position of the primary sheave, a length of the V-belt, a distance between the sheaves, an angle of the sheave, and a change gear ratio during idling, and the calculated belt width is stored. The control device performs a feed-forward control on the starter in which it corrects the target position of the primary sheave on the basis of the belt width, and then controls the sheave position so as to reach the corrected target position. When the calculated belt width becomes equal to or smaller than a predetermined threshold, the control device issues an alarm that alerts the driver to replace the V-belt.