摘要:
[Problem] An object of the present invention is to provide a power state diagnosis method and a power state diagnosis apparatus that pass and increase not only a d-axis current but also a q-axis current to a current value that a steering behavior does not occur to perform a diagnosis in the vector control of a motor, and determine that a power supply degraded, that the power supply is normal and that the diagnosis is not completed without giving an uncomfortable feeling to a driver, detecting a timing that there is not a driver, and needing to comprise a plurality of actuators. [Means for solving the problem] The present invention is a power state diagnosis method that diagnoses a power state of a vehicle which comprises an electrical control system supplied from a power supply and a motor controlled by a vector control method, comprising: gradually increasing a d-axis current to a current value that a steering behavior does not occur and applying the d-axis current, concurrently gradually increasing a q-axis current that is a rectangular-wave with positive and negative directions to the current value and applying the q-axis current, and determining degradation of the power supply when a Voltage value of the power supply is equal to or less than a power supply threshold and a given period of time T1 elapses.
摘要:
A control method for an electric power steering system is provided. The method includes providing a power steering control signal (48); providing a disturbance cancel command (50); varying at least one filter based on a frequency of the disturbance cancel command (50); applying the at least one varied filter to the disturbance cancel command (50) to generate a compensation signal; applying the compensation signal to the power steering control signal (48) to generate a compensated control signal (54); and controlling the power steering system based on the compensated control signal (54).
摘要:
A diagnostic system and method for an electric power steering system are provided. The diagnostic system includes a first microprocessor that determines a first relative position value indicating the relative rotational position of the rotatable shaft at the first time based on the signals from first and second position sensors. A second microprocessor determines a second relative position value indicating the relative rotational position of the rotatable shaft at the first time based on the signals from third and fourth position sensors. The first microprocessor determines whether the first relative position value is an acceptable value based on a difference between the first relative position value and the second relative position value.
摘要:
An angular velocity estimate (ωe) used in motor control of an electric power steering is obtained as follows. In a first state period during which the motor substantially stops its rotation, a resistance calculation unit (52) calculates a motor resistance value (Rc) on the basis of a detected value (Vm) of motor voltage and a detected value (Im) of motor current. An average calculation unit (53) obtains an average value (Rav) of the calculated resistance values (Rc) in a retained period. A current-resistance characteristic that associates motor current with motor resistance is held in a characteristic holding unit (55), and a characteristic updating unit (54) updates the current-resistance characteristic on the basis of the average value (Rav). An estimate calculation unit (56) calculates the angular velocity estimate (ωe) on the basis of the detected value (Vm) of motor voltage, the detected value (Im) of motor current and a motor resistance value (Rm) obtained from the current-resistance characteristic.
摘要:
In einer Hüfskraftlenkung (26) eines Kraftfahrzeugs (20) kann ein Elektromotor an seine Leistungsgrenze geraten, insbesondere wenn zusätzlich eine Überlagerungslenkung in dem Kraftfahrzeug (10) vorgesehen ist. Vorgestellt wird ein Verfahren, demgemäß eine Drehzahlreserve (Δn a , -Δn b ) ermittelt wird, und zwar aus der tatsächlich von dem Elektromotor aufgebrachten Leistung, einer insbesondere situativ ermittelten maximal möglichen Leistung und der ermittelten aktuellen Drehzahl. In Abhängigkeit von der so ermittelten Drehzahlreserve können andere Systeme reagieren, zum Beispiel kann die Überlagerungslenkung betrieblich angepasst werden.
摘要:
A system and a method for determining an absolute position of a motor shaft (42) in an electric power steering system (24) during an ignition off state are provided. The system includes a microprocessor (66) that energizes first and second position sensors (60,62) to generate first and second signals, respectively, at a first time, and third and fourth signals, respectively, at a second time. The microprocessor (66) determines a first relative position value based on the first and second signals, and a second relative position value based on the third and fourth signals. The microprocessor (66) determines an amount of relative rotation of the shaft (42) during the ignition off state based on the first and second relative position values, and determines a current absolute position value based on a previously stored absolute position value and the amount of relative rotation of the rotatable shaft (42).