Abstract: An automatic transmission includes an input member, a planetary gear mechanism, a plurality of engagement mechanisms, an output member, a control unit, and a switching mechanism. The control unit is able to perform a backward preparation mode (step 3) which enables the rpm of an element fixed by the switching mechanism to be predetermined rpm or less by bringing the engagement mechanism into a connected state or a fixed state when the shift position is switched from a forward range to a backward range (step 1). The control unit switches the switching mechanism from a reverse-rotation preventing state to the fixed state (step 7) after the rpm of the element becomes the predetermined rpm or less (step 5) by performing the backward preparation mode.

Abstract: An automatic transmission controller for controlling an automatic transmission includes an idling reduction controller, an idling-reduction-control permission determiner, and an engagement controller. The idling-reduction-control permission determiner is configured to determine whether or not to permit an idling reduction control. The engagement controller, in a case where the idling-reduction-control permission determiner permits the idling reduction control, is configured to allow rotation of an input shaft of an automatic transmission, and in a case where an output shaft of the automatic transmission is rotated by a wheel of a vehicle in a rotational direction such that the vehicle moves backward, is configured to set a plurality of engagement mechanisms including at least a mechanical engagement mechanism so as to fix the output shaft of the automatic transmission to a casing of the automatic transmission or so as to prevent the vehicle from moving backward.

Abstract: An automatic transmission includes an input member, a planetary gear set, a plurality of engagement mechanisms, an output member, a shift position detecting unit, an input rotational speed detecting unit, a control unit, and a switching mechanism. When a shift position is changed from a forward drive range to a reverse drive range, the control unit performs a reverse preparation mode in which a rotational speed of an element to be fixed by the switching mechanism is lower than or equal to a predetermined speed by setting an engagement mechanism in one of a connection mode and a fixed mode. Upon performing the reverse preparation mode, the control unit engages the engagement mechanism that connects the element fixed by the switching mechanism to the input member and, thereafter, engages the engagement mechanism that makes the rotational speed of the input member lower than or equal to the predetermined speed.

Abstract: An automatic transmission includes engagement mechanisms whose engagement states among the engagement mechanisms are changeable to achieve each of shift stages of the automatic transmission, a detector, and a determination device. The detector is configured to detect the engagement states of the engagement mechanisms. The determination device is configured to determine that abnormality has occurred in a case where the engagement states detected by the detector do not match a predetermined engagement state.

Abstract: An automatic transmission includes an input member, a planetary gear mechanism, a plurality of engagement mechanisms, an output member, a shift position detector, an input rotational speed detector, a controller, and a switching mechanism. The controller is configured to set the switching mechanism in a reverse-rotation prevention state when a shift position is set in a forward movement range and configured to set the switching mechanism in a fixed state when the shift position is set in a backward movement range. The controller is configured to control the plurality of engagement mechanisms so that the input member is capable of rotating and rotation of the output member is prevented in a case in which a vehicle is moving backward, the shift position is switched from the backward movement range to the forward movement range, and a vehicle speed is greater than or equal to a first predetermined speed.

Abstract: An automatic transmission controller for controlling an automatic transmission includes a neutral controller which is configured to perform neutral control, a neutral control permission determiner, and an engagement controller. The automatic transmission includes a plurality of planetary gear mechanisms and a plurality of engagement mechanisms. One of the plurality of engagement mechanisms is a mechanical engagement mechanism. The engagement controller is configured to allow rotation of an input shaft of the automatic transmission in a case where the neutral control determiner permits the neutral control and configured to set the plurality of engagement mechanisms including at least the mechanical engagement mechanism so as to fix an output shaft of the automatic transmission to a casing of the automatic transmission in a case where the output shaft of the automatic transmission is rotated by a wheel of a vehicle in a rotational direction such that the vehicle moves backward.

Abstract: An automatic transmission controller for controlling an automatic transmission includes an idling reduction controller, an idling-reduction-control permission determiner, and an engagement controller. The idling-reduction-control permission determiner is configured to determine whether or not to permit an idling reduction control. The engagement controller, in a case where the idling-reduction-control permission determiner permits the idling reduction control, is configured to allow rotation of an input shaft of an automatic transmission, and in a case where an output shaft of the automatic transmission is rotated by a wheel of a vehicle in a rotational direction such that the vehicle moves backward, is configured to set a plurality of engagement mechanisms including at least a mechanical engagement mechanism so as to fix the output shaft of the automatic transmission to a casing of the automatic transmission or so as to prevent the vehicle from moving backward.

Abstract: An automatic transmission includes an input member, a planetary gear mechanism, a plurality of engagement mechanisms, an output member, a shift position detector, an input rotational speed detector, a controller, and a switching mechanism. The controller is configured to set the switching mechanism in a reverse-rotation prevention state when a shift position is set in a forward movement range and configured to set the switching mechanism in a fixed state when the shift position is set in a backward movement range. The controller is configured to control the plurality of engagement mechanisms so that the input member is capable of rotating and rotation of the output member is prevented in a case in which a vehicle is moving backward, the shift position is switched from the backward movement range to the forward movement range, and a vehicle speed is greater than or equal to a first predetermined speed.

Abstract: An automatic transmission includes an input member, a planetary gear set, a plurality of engagement mechanisms, an output member, a shift position detecting unit, an input rotational speed detecting unit, a control unit, and a switching mechanism. When a shift position is changed from a forward drive range to a reverse drive range, the control unit performs a reverse preparation mode in which a rotational speed of an element to be fixed by the switching mechanism is lower than or equal to a predetermined speed by setting an engagement mechanism in one of a connection mode and a fixed mode. Upon performing the reverse preparation mode, the control unit engages the engagement mechanism that connects the element fixed by the switching mechanism to the input member and, thereafter, engages the engagement mechanism that makes the rotational speed of the input member lower than or equal to the predetermined speed.

Abstract: An automatic transmission includes an input member, a planetary gear mechanism, a plurality of engagement mechanisms, an output member, a control unit, and a switching mechanism. The control unit is able to perform a backward preparation mode (step 3) which enables the rpm of an element fixed by the switching mechanism to be predetermined rpm or less by bringing the engagement mechanism into a connected state or a fixed state when the shift position is switched from a forward range to a backward range (step 1). The control unit switches the switching mechanism from a reverse-rotation preventing state to the fixed state (step 7) after the rpm of the element becomes the predetermined rpm or less (step 5) by performing the backward preparation mode.