Drive control device

A drive control device comprising:

• a processor configured to function as:
• an estimated longitudinal acceleration acquisition part which acquires an estimated longitudinal acceleration of a vehicle based on an estimated driving force of the vehicle and a wheel speed of main drive wheels of the vehicle;
• an estimated lateral acceleration acquisition part which acquires an estimated lateral acceleration of the vehicle;
• an estimated tire load calculation part which calculates an estimated tire load of the main drive wheels based on the estimated longitudinal acceleration acquired by the estimated longitudinal acceleration acquisition part and the estimated lateral acceleration acquired by the estimated lateral acceleration acquisition part;
• and
• a drive mode selection part which selects one of a two-wheel drive mode driven only by the main drive wheels and a four-wheel drive mode driven by both the main drive wheels and auxiliary drive wheels in the vehicle,
• wherein when the estimated tire load calculated by the estimated tire load calculation part is lower than a two-wheel drive threshold value, the drive mode selection part selects the two-wheel drive mode in the vehicle,
• wherein the estimated longitudinal acceleration acquisition part acquires a first longitudinal acceleration of the vehicle calculated from the estimated driving force of the vehicle,
• wherein the estimated longitudinal acceleration acquisition part acquires a second longitudinal acceleration of the vehicle calculated from the wheel speed of main drive wheels of the vehicle,
• wherein the estimated longitudinal acceleration acquisition part compares the first longitudinal acceleration and the second longitudinal acceleration, and acquires a larger value between the first longitudinal acceleration and the second longitudinal acceleration as the estimated longitudinal acceleration.