Drive control system for work vehicle

摘要

A drive control system for a work vehicle is provided with a power transmission device that drives front wheels and rear wheels, a request determination unit, and a drive mode control unit. The power transmission device has a drive mode switching mechanism that performs drive mode switching between a four-wheel drive mode in which drive power is transmitted to front wheels and rear wheels and a two-wheel drive mode in which drive power is transmitted to only the rear wheels. The request determination unit determines a necessity for an increase in drive power on a contact area of the work vehicle, and outputs an increase request based on the determination result. The drive mode control unit outputs a drive mode switching request for switching to the four-wheel drive mode to the drive mode switching mechanism, in response to output of the increase request.

主权项

1. A drive control system for a work vehicle, comprising:
a power transmission device having a drive mode switching mechanism that performs drive mode switching between a four-wheel drive mode in which drive power is transmitted to front wheels and rear wheels and a two-wheel drive mode in which drive power is transmitted to only the rear wheels; a slip ratio detection unit that calculates a slip ratio with respect to a contact area of wheels that are being driven; an inclination angle detection unit that detects an inclination angle in a front-back direction of the work vehicle; and a drive mode control unit that outputs a drive mode switching request to the drive mode switching mechanism based on the slip ratio detected by the slip ratio detection unit and the inclination angle detected by the inclination angle detection unit, wherein a drive mode switching request for switching to the four-wheel drive mode is output in a case where a slip ratio exceeding a slip ratio threshold set in advance is detected, a drive mode switching request for switching to the two-wheel drive mode is output in a case where a reduction in the slip ratio and a reduction in the inclination angle are detected, and wherein an inclination angle, that is smaller by a predetermined percentage than the inclination angle detected by the inclination angle detection unit at the time of outputting the drive mode switching request for switching to the four-wheel drive mode, is stored as an inclination angle threshold, and wherein when the inclination angle detected by the inclination angle detection unit after switching to the four-wheel drive mode is smaller than the inclination angle threshold, a drive mode switching request for switching from the four-wheel drive mode to the two-wheel drive mode is outputted.