Control system in a vehicle

A control system in a vehicle including at least one pair of driving power transmission members which are engaged with each other with a slack on a driving power transmission path through which a driving power is transmitted from a driving power source to a drive wheel, the control system comprising:

• an input shaft rotational speed detector for detecting a rotational speed of an input shaft located upstream of engaged portions of the driving power transmission members in a direction in which the driving power is transmitted, the engaged portions being engaged with each other with the slack;
• a determiner for determining whether or not the driving power transmission members are in a non-contact state at the engaged portions for a period of time, based on a change rate of the detected input shaft rotational speed, the change rate being with respect to time;
• and
• a controller for controlling the vehicle to reduce a rotational speed difference between the input shaft and an output shaft located downstream of the engaged portions in the direction in which the driving power is transmitted, when the determiner determines that the driving power transmission members are in the non-contact state.