Vehicle driving control device

A vehicle driving control device comprising:

• a wheel speed detector configured to detect respective wheel speeds of front wheels and rear wheels of a four-wheel-drive vehicle;
• and
• a tire chain mounting determination logic unit,
• the tire chain mounting determination logic unit comprising:
• a vehicle body speed detector configured to detect a vehicle body speed of the four-wheel-drive vehicle;
• a front wheel slip ratio calculator configured to calculate a front wheel slip ratio based on the wheel speeds of the front wheels detected by the wheel speed detector and the vehicle body speed detected by the vehicle body speed detector;
• a rear wheel slip ratio calculator configured to calculate a rear wheel slip ratio based on the wheel speeds of the rear wheels detected by the wheel speed detector and the vehicle body speed detected by the vehicle body speed detector, at a same road surface position as a road surface position at which the front wheel slip ratio has been calculated;
• and
• a tire chain mounting determiner configured to determine that tire chains are mounted on the front wheels or the rear wheels which have a lower slip ratio, when a difference between the front wheel slip ratio calculated by the front wheel slip ratio calculator and the rear wheel slip ratio calculated by the rear wheel slip ratio calculator is greater than or equal to a first threshold.