Control apparatus for multi-phase rotary machine and electric power steering system
AssigneeDenso Corporation
InventorTakashi Suzuki
Life of this patent
Estimating the term…
Abstract
A control apparatus for a multi-phase rotary machine includes a control unit and a plurality of power supply systems including respective inverter units. When a short-circuiting failure occurs in one of the systems due to an ON-failure in any one of FETs in an inverter unit of the failure system, the control unit stops driving of the rotary machine by bringing all the FETs in the failure system into the OFF state. The control unit controls FETs of the non-failure system such that a brake torque generated in the failure system is cancelled or the influence of the brake torque exerted on the driving of the motor is reduced.
Claims16
A control apparatus for a multi-phase rotary machine for controlling driving of the multi-phase rotary machine including a plurality of winding sets, each of which is formed of a plurality of windings corresponding to a plurality of phases, respectively, the control apparatus comprising:
- a plurality of inverter units forming a plurality of systems, each of the inverter units having a plurality of legs provided in correspondence to the plurality of phases, each of the legs including a high-side switching element and a low-side switching element;
- and
- a control unit for driving the multi-phase rotary machine by calculating a voltage command value, which is a command value of a voltage applied to each of the windings, and by controlling ON/OFF switching of the high-side switching element and the low-side switching element based on the voltage command value,
- wherein the control unit is configured to
- in a case where a short-circuiting failure occurred between a common bus at a high-side or a low-side of the leg and any one of the phases of the windings even when the high-side switching element and the low-side switching element are controlled to assume the OFF states,
- control all of the high-side switching elements and the low-side switching elements of a failure system into OFF states, respectively,
- continue to drive the multi-phase rotary machine by the legs of a no-failure system, and
- control the high-side switching element and the low-side switching element of each leg in the no-failure system such that an output is cancelled or an influence of the output exerted on the driving of the multi-phase rotary machine is reduced, the output being generated by the short-circuiting failure in the failure system and resistive to driving of the multi-phase rotary machine.
A control apparatus for a multi-phase rotary machine for controlling driving of the multi-phase rotary machine including a plurality of winding sets, each of which is formed of a plurality of windings corresponding to a plurality of phases, respectively, the control apparatus comprising:
- a plurality of inverter units forming a plurality of systems, each of the inverter units having a plurality of legs provided in correspondence to the plurality of phases, each of the legs including a high-side switching element and a low-side switching element;
- and
- a control unit for driving the multi-phase rotary machine by calculating a voltage command value, which is a command value of a voltage applied to each of the windings, and by controlling ON/OFF switching of the high-side switching element and the low-side switching element based on the voltage command value,
- wherein the control unit is configured to
- in a case where a short-circuiting failure occurred between a common bus at a high-side or a low-side of the leg and any one of the phases of the windings even when the high-side switching element and the low-side switching element are controlled to assume the OFF states,
- control both of the high-side switching element and the low-side switching element of the leg of a failure phase or switching elements of no failure among the legs of the failure system into OFF states, respectively,
- continue to drive the multi-phase rotary machine by the leg of a no-failure phase among the legs of the failure system and the legs of the no-failure system, and control the high-side switching element and the low-side switching element of the no-failure system such that an output of the failure system is cancelled or an influence of the output exerted on the driving of the multi-phase rotary machine is reduced, the output being generated by driving the multi-phase rotary machine by the leg of the no-failure phase among the legs of the failure system.
Dependencies are inferred from the claim text.