PROBLEM TO BE SOLVED: To provide a conversion factor acquisition apparatus capable of accurately acquiring a conversion factor.SOLUTION: A conversion factor is a value determined by a dynamic load radius Re and acquired when a learning condition is met. If a vehicle is in the middle of traveling on a good direct road (S21), a braking force and a driving force are not applied to the vehicle (S22, S25 to S27), and a spring constant and a damping coefficient of a suspension are minimum values (S23, S24), then it is determined that the learning condition is met (S28), and the dynamic load radius Re is acquired and the conversion factor is acquired. While the dynamic load radius Re changes with a change in load, the change in load is small as compared with a change in the stroke of the suspension if the spring constant and the damping coefficient of the suspension are the minimum values. Since the dynamic load radius Re is acquired in a state in which the change in load is suppressed as described above, the conversion factor can be accurately acquired.
【課題】換算係数取得装置において、換算係数を正確に取得する。【解決手段】換算係数は、動荷重半径Reで決まる値であり、学習条件が成立すると取得される。良路直進走行中(S21)であって、制動力、駆動力が加えられず(S22,S25〜27)、かつ、サスペンションのばね定数、減衰係数が最小値(S23,24)である場合に学習条件が成立したとされ(S28)て、動荷重半径Reが取得され、換算係数が取得される。動荷重半径Reは荷重の変化に伴って変化するが、サスペンションのばね定数、減衰係数が最小値である場合には、サスペンションのストロークの変化に対する荷重の変化が小さくなる。このように、荷重の変化が抑制された状態で動荷重半径が取得されるため、換算係数を正確に取得することができる。【選択図】 図3
CONVERSION FACTOR ACQUISITION APPARATUS
換算係数取得装置
2015-08-24
Patent
Electronic Resource
Japanese
IPC: | B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / G01P MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION OR SHOCK , Messen der Linear- oder Winkelgeschwindigkeit, der Beschleunigung, der Verzögerung oder des Stoßes / B60T Bremsanlagen für Fahrzeuge oder Teile davon , VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF / F02D CONTROLLING COMBUSTION ENGINES , Steuern oder Regeln von Brennkraftmaschinen |
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