Control unit and electric power steering equipment having the control unit
A technology of control unit and power conversion, applied in the direction of electric steering mechanism, power steering mechanism, control system, etc.
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no. 1 approach
[0020] refer to figure 1 , the EPS-ECU 1 as a control unit according to the first embodiment drives and controls a motor (M) 20 as a rotary electric machine. The EPS-ECU 1 is used for, for example, an electric power steering (EPS) device of a vehicle that assists a steering operation together with an electric motor 20 . In such a case, EPS-ECU 1 is an electronic control unit for an electric power steering apparatus.
[0021] figure 2 is a diagram schematically showing the overall structure of a steering system 90 including an electric steering device 99 . The electric power steering device 99 includes a torque sensor (TS) 94 . A torque sensor 94 is attached to a steering shaft 92 which is connected to a steering wheel 91 . The torque sensor 94 senses a steering torque input from the steering wheel 91 to the steering shaft 92 by an operator such as a driver of the vehicle.
[0022] A pinion 96 is provided at one end of the steering shaft 92 . The pinion gear 96 is engage...
no. 2 approach
[0107] exist Figure 4 A part of a control device according to a second embodiment of the present disclosure is shown in . In the second embodiment, the structure of the motor 20 as the object to be controlled, the internal structure of the EPS-ECU 1 , and the like are different from those in the first embodiment.
[0108] In the second embodiment, a motor 20 as an object to be controlled by the EPS-ECU 1 includes a winding unit 29 in addition to the winding units 27 and 28 . The winding unit 29 is composed of three windings (not shown) corresponding to the U phase, the V phase, and the W phase, respectively.
[0109] EPS-ECU 1 includes an inverter 33 in addition to inverters 31 and 32 . The inverter 33 has a structure similar to that of the inverters 31 and 32 . The inverter 33 is electrically connected to the winding unit 29 .
[0110] In the present embodiment, at least one of the inverters 31 , 32 , and 33 converts electric power from the main power source 11 and suppl...
no. 3 approach
[0118] exist Figure 5 A part of a control unit according to a third embodiment of the present disclosure is shown in . In the third embodiment, the internal structure of the EPS-ECU 1 such as the connection point of the booster unit 60 is different from the second embodiment.
[0119] In the third embodiment, the first end 601 of the voltage boosting component 60 is electrically connected between the relay 42 and the inverter 32 and is electrically connected between the relay 49 and the inverter 33 . That is, the first end 601 of the step-up component 60 is electrically connected to at least one of the "relays (42, 49) following the excluded relay (41) selected from a plurality of relays (41, 42, 49)" (42 , 49) and the inverter (32 and 33).
[0120] In this embodiment, when the abnormality detection part 511 detects an abnormality of the switching element 62 of the booster part 60, the control part 50 controls to turn off the relays 42 and 49 connected to the first end 601 ...
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