To avoid lowering of the work efficiency of an electric tractor under a condition where input/output power of a battery is limited.SOLUTION: An electric tractor comprises a vehicle body, a working machine, an electric motor, a battery, and an inverter for controlling input/output power of the battery. The electric tractor comprises a control device for controlling the inverter. The control device performs limit processing, charge rate calculation processing, and relaxation processing. In the limit processing, when a state of the battery satisfies a predetermined limit condition, the control device controls the inverter so that an input and an output of the battery are limited within a predetermined regulation power range. In the charge rate calculation processing, the control device calculates a charge rate of the battery when it is assumed that the tractor has finished work in a farm field as an estimated charge rate. In the relaxation processing, when the estimated charge rate calculated in the charge rate calculation processing is higher than a first regulation charge rate, the control device widens the regulation power range.SELECTED DRAWING: Figure 5

    【課題】バッテリの入出力電力を制限している状態下において、電動トラクタの作業効率を低下させない。【解決手段】電動トラクタは、車体と、作業機械と、電動モータと、バッテリと、バッテリの入出力電力を制御するインバータと、を備えている。電動トラクタは、インバータを制御対象とする制御装置を備えている。制御装置は、制限処理と、充電率算出処理と、緩和処理と、を実行する。制御装置は、制限処理において、バッテリの状態が予め定められた制限条件を満たしたときに、バッテリの入出力が予め定められた規定電力範囲内に制限されるようにインバータを制御する。制御装置は、充電率算出処理において、圃場内を作業し終えたと仮定したときのバッテリの充電率を、推定充電率として算出する。制御装置は、緩和処理において、充電率算出処理で算出した推定充電率が第1規定充電率よりも大きい場合に、規定電力範囲を広くする。【選択図】図5


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    Title :

    ELECTRIC TRACTOR


    Additional title:

    電動トラクタ


    Contributors:
    SUGO YUKI (author)

    Publication date :

    2023-02-15


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / A01B SOIL WORKING IN AGRICULTURE OR FORESTRY , Bodenbearbeitung in Land- oder Forstwirtschaft / H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung



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