CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Japanese Patent Application No. 2018-112796 filed Jun. 13, 2018, the disclosure of which is hereby incorporated by reference in its entirety.

TECHNICAL FIELD

The present invention relates to a work evaluation system for carrying out evaluation of a grass mowing work performed by a work vehicle.

BACKGROUND ART

Conventionally, there has been contemplated a system for evaluating an agricultural work performed in a work land. As the technique of this type, one is known from e.g. Patent Document 1 identified below.

Patent Document 1 discloses an agricultural work evaluation system. This agricultural work evaluation system calculates, for each field, a score of an agricultural work, based on agricultural work data of agricultural works performed by an agricultural machine, and then displays such calculated score and/or evaluation set in correspondence with the score, on a display section.

BACKGROUND ART DOCUMENT

Patent Document

Patent Document 1: Japanese Unexamined Patent Application Publication No. 2017-129939.

SUMMARY OF THE INVENTION

Problem to be Solved by Invention

The technique disclosed in Patent Document 1 is explained therein by way of a tractor as an example of the agricultural machine. And, as the agricultural work data, information indicative of a moving distance, a moving speed or a position of the tractor is acquired. More particularly, in case a utility implement is a cultivator for instance, a rotational speed of a rotary unit, a load of the rotor unit, an engine rotational speed, a cultivation depth, a cultivation width, etc. are collected as the agricultural work data. Whereas, in case the implement is a fertilizer distributor, a pesticide sprayer, or a seeder, a spraying (distribution) amount (fertilizer distribution amount, pesticide spraying amount, seed distribution amount) or a spraying width, etc. will be collected as the agricultural work data. However, the agricultural work can also be a grass mowing work for mowing/cutting grass grown in the work land. As the technique disclosed in Patent Document 1 does not take such grass mowing work into consideration, there remains room for improvement.

Then, there is a need for a work evaluation system capable of appropriately evaluating a grass mowing work.

Solution

According to a characterizing feature of a work evaluation system relating to one embodiment of the present invention, there is provided a work evaluation system configured to effect evaluation of a grass mowing work performed by a work vehicle, the system comprising:a state information acquisition section for acquiring vehicle state information indicative of a state of the work vehicle when performing the grass mowing work;a sound data acquisition section for acquiring sound data comprised of collection of sounds around the work vehicle;a foreign object amount calculation section for calculating an amount of foreign objects present in the work land which come into contact with a mowing blade in the course of the grass mowing work; andan evaluation section for evaluating the grass mowing work performed in the work land, based on the vehicle state information and the foreign object amount.

With the above-described characterizing feature, it is possible to automatically effect evaluation or grading of the grass mowing work with using various kinds of information, with clarification of evaluation criteria respecting the quality (good/poor) of the grass mowing work. Further, it becomes also possible to carry out the evaluation appropriately without relaying on experience in the evaluation of the grass mowing work quality. Moreover, in case a worker to perform the grass mowing work differs from a client (user) of the grass mowing work, the user can determine objectively a work rank (skill) of the work, on the basis of the result of evaluation on the worker. In this way, with the inventive work evaluation system, it becomes possible to evaluate a grass mowing work appropriately.

Preferably, the work evaluation system further comprises:an instruction information acquisition section for acquiring instruction information to be inputted to a control unit for controlling a pair of left and right electric motors that drive a pair of left and right driving wheels of the work vehicle;an acceleration information acquisition section for acquiring acceleration information indicative of an acceleration affecting the work vehicle;a terrain condition determination section for determining a condition of the work land based on the instruction information and the acceleration information; anda difficulty calculation section for calculating difficulty of the grass mowing work in the work land, based on the condition of the work land and the foreign object amount.

With the above-described arrangement, it becomes possible to utilize the results of respective detections as “source data” for use in the evaluation or grading of the grass mowing work. Further, with clarification of the evaluation criteria for the difficulty of the work land, the evaluation of difficulty can be effected objectively and automatically, with using the various kinds of information. Moreover, even when the worker and the user (client) of the grass mowing work differ from each other, both the user and the worker can be informed of the difficulty of the work land.

Still preferably:the vehicle state information is at least one of position information indicative of a position of the work vehicle, acceleration information indicative of acceleration affecting the work vehicle, rotational speed information indicative of a rotational speed(s) of the pair of left and right driving wheels of the work vehicle and an electric current value(s) of current(s) flowing in the pair of electric motors for driving the pair of left and right driving wheels; andthe evaluation section effects the evaluation of the grass mowing work, based on the at least one information.

With the above-described arrangement, it becomes possible to utilize the results of respective detections as source data for use in the evaluation or grading of the grass mowing work and/or the determination of the difficulty.

Still preferably, the evaluation section can show the result of evaluation on the grass mowing work in the form of a rank or a score.

With the above-described arrangement, the evaluation of the grass mowing work can be carried out easily and appropriately.

