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US 10,864,937 B2Granted
Electric power steering apparatus
AssigneeMitsubishi Electric Corporation
InventorsMunenori Yamamoto, Akihiko Mori, Jun Suzumura
Life of this patent
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Abstract
When detecting an abnormality in a portion related to control of an electric motor, a CPU that calculates a control amount for controlling the electric motor calculates a control amount different from a control amount at a normal time so as to continue the control of the electric motor and changes a threshold value for detecting the abnormality to a value different from a value at a normal time.
Claims18
An electric power steering apparatus comprising:
- an electric motor that produces assist torque, based on a steering torque produced by a driver of a vehicle;
- and
- a controller that controls the electric motor,
- wherein the controller includes
- an input circuit to which information to be utilized to control the electric motor is inputted,
- an inverter circuit that supplies an electric current to the electric motor,
- a CPU that calculates a control amount for controlling the electric motor, based on the information inputted to the input circuit, and outputs a command signal based on the control amount, and
- a driving circuit that drives the inverter circuit, based on the command signal outputted from the CPU, and
- wherein the CPU has an abnormality control mode in which, when detecting an abnormality in a portion related to control of the electric motor, the CPU calculates a control amount that is different at least from a control amount at a normal time, in accordance with the portion in which the abnormality has occurred and the contents of the abnormality, and then continues control of the electric motor;
- and when control of the electric motor is continued in the abnormality control mode, a threshold value for detecting the abnormality is changed to a value different from a value at a normal time, in accordance with the contents of the control in the abnormality control mode.
7 more elements
An electric power steering apparatus comprising:
- an electric motor that produces assist torque, based on steering torque produced by a driver of a vehicle;
- and
- a controller that controls the electric motor,
- wherein the electric motor is provided with two sets of armature windings including a first armature winding and a second armature winding that are formed in substantially the same manner,
- wherein the controller is formed of two sets of controllers that are formed in substantially the same manner and that include a first controller formed in such a way as to be capable of independently controlling the first armature winding and a second controller formed in such a way as to be capable of independently controlling the second armature winding,
- wherein each of the first controller and the second controller has
- an input circuit to which information from a plurality of sensors is inputted,
- a driving circuit that generates a driving signal for driving the electric motor,
- an inverter circuit that is controlled by the driving signal, and
- a control circuit provided with a CPU that outputs a command signal for controlling the electric motor to the driving circuit, based on the information inputted to the input circuit, and
- wherein the CPU has an abnormality control mode in which when detecting an abnormality in part of the plurality of sensors, the CPU calculates a control amount that is different at least from a control amount at a normal time, in accordance with the sensor in which the abnormality has occurred and the contents of the abnormality, and then continues control of the electric motor;
- and when control of the electric motor is continued in the abnormality control mode, a threshold value for detecting the abnormality is changed to a value different from a value at a normal time, in accordance with the contents of the control in the abnormality control mode.
9 more elements
Dependencies are inferred from the claim text.