PROBLEM TO BE SOLVED: To precisely acquire an operation characteristic being a relationship between a current flowing in a coil of an electromagnetic valve and a pressure difference between a high-pressure side and a low-pressure side at the switching of the opening/closing of the electromagnetic valve.SOLUTION: A current flowing in a coil is controlled by the duty control of a switching part. Then, when the current which actually flows in the coil is made to approximate a first current value and a second current value, a pressure difference at which an electromagnetic valve can be opened and closed is acquired, a first operation characteristic point and a second operation characteristic point are acquired, and an operation characteristic is acquired. In this operation characteristic acquisition device, the current flowing in the coil is made to approximate the first current value in a state that a coil temperature is high, and a duty ratio is higher than a set value Ds. As a result, an average current being an average value of the currents which actually flow in the coil can be precisely acquired, the first operation characteristic point can be precisely acquired, and the operation characteristic can be precisely acquired.SELECTED DRAWING: Figure 10
【課題】電磁弁のコイルに流れる電流と、電磁弁の開閉が切り換わる際の高圧側と低圧側との差圧との関係である作動特性を、高い精度で取得する。【解決手段】コイルに流れる電流は、スイッチング部のデューティ制御により制御される。そして、コイルに実際に流れた電流が第1電流値、第2電流値に近づけられた場合に、電磁弁が開閉させられる差圧が取得され、第1作動特性点、第2作動特性点が取得され、作動特性が取得される。本作動特性取得装置においては、コイルの温度が高く、デューティ比が設定値Dsより大きい状態で、コイルに流れる電流が第1電流値に近づけられる。その結果、コイルに実際に流れた電流の平均値である平均電流を精度よく取得することができ、第1作動特性点を精度よく取得することができ、高い精度で作動特性を取得することができる。【選択図】図10
OPERATION CHARACTERISTIC ACQUISITION DEVICE
作動特性取得装置
2016-05-30
Patent
Elektronische Ressource
Japanisch
IPC: | B60T Bremsanlagen für Fahrzeuge oder Teile davon , VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF |
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