Pulsed electric machine control
AssigneeTula eTechnology, Inc.
InventorPaul Carvell
Life of this patent
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Abstract
A variety of methods, controllers and electric machine systems are described that facilitate pulsed control of electric machines to improve the energy efficiency of the electric machine when conditions warrant. Selected transitions between pulsing output levels are controlled to provide a cubic or higher order transition torque profile. In various implementations, cubic, quintic or higher order transition profiles are use. The use of such transition torque profiles can improve NVH characteristics of the electric machine while providing energy efficient pulse transitions.
Claims21
A method of controlling operation of an electric machine, the method comprising:
- directing pulsed operation of the electric machine to deliver a requested average output, wherein the pulsed operation causes the electric machine to alternate between a first output level that is greater than the requested average output and a second output level that is less than the requested average output;
- and
- controlling selected transitions from the first output level to the second output level, or the second output level to the first output level using a cubic or higher order transition profile.
A method of controlling operation of an electric machine, the method comprising:
- directing pulsed operation of the electric machine to deliver a requested average output, wherein the pulsed operation causes the electric machine to alternate between a first output level that is greater than the requested average output and a second output level that is less than the requested average output;
- and
- controlling selected transitions between the output levels using a quintic or higher order transition profile.
An electric machine controller arranged to direct operation of a power converter that controls an electric machine, the electric machine controller comprising:
- a pulsing decision module that determines when pulsed operation of the electric machine is desirable and when continuous operation of the electric machine is desirable to deliver a requested average output;
- and
- a pulse controller that directs the pulsed operation of the electric machine when the pulsing decision module determines that the pulsed operation of the electric machine is desirable, wherein the pulsed operation causes the electric machine to alternate between a first output level that is greater than the requested average output and a second output level that is less than the requested average output, the pulse controller including a transition profile generator that controls transitions from the second output level to the first output level using a cubic or higher order transition profile.
A method of controlling operation of an electric machine, the method comprising:
- directing pulsed operation of the electric machine to deliver a requested average output, wherein the pulsed operation causes the electric machine to alternate between a first output level that is greater than the requested average output and a second output level that is less than the requested average output;
- and
- controlling transitions from the second output level to the first output level using an S-shaped commanded torque transition profile.
A method of controlling operation of an electric machine, the method comprising:
- directing pulsed operation of the electric machine to deliver a requested average output, wherein the pulsed operation causes the electric machine to alternate between a first output level that is greater than the requested average output and a second output level that is less than the requested average output;
- and
- controlling selected transitions between the output levels using a cubic or higher order transition profile, wherein transition from the first output level to the second output level are controlled in accordance with a first transition profile and transition from the second output level to the first output level are controlled in accordance with a second transition profile that is different than the first profile, both the first and second transition profiles being cubic or higher order transition profiles.
Dependencies are inferred from the claim text.