Apparatus and method of controlling motor for reducing vibration of electric vehicle

• US 9,987,916 B2
• Filed: 11/10/2015
• Issued: 06/05/2018
• Est. Priority Date: 09/10/2015
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Inventors: Cho, Woocheol
• Primary Examiner(s): Black, Thomas G
• Assistant Examiner(s): Kong, Sze-Hon
• Application Number:
  US14/937,608
• Publication Number:
  US 20170072805A1
• Time in Patent Office: 938 Days
• CPC Class Codes: B60K 2006/4825 Electric machine connected or connectable to gearbox input shaft
• CPC Class Codes: B60K 6/26 characterised by the motors or the generators
• CPC Class Codes: B60K 6/387 Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60L 15/2009 for braking
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2270/145 Structure borne vibrations
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: B60L 7/14 for vehicles propelled by ac motors
• CPC Class Codes: B60W 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60W 20/17 for noise reduction
• CPC Class Codes: B60W 2030/206 related or induced by the engine
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: B60W 30/18127 Regenerative braking
• CPC Class Codes: B60W 30/20 : Reducing vibrations in the driveline
• CPC Class Codes: B60Y 2200/92 : Hybrid vehicles
• CPC Class Codes: B60Y 2300/18125 : Regenerative braking
• CPC Class Codes: B60Y 2300/20 : Reducing vibrations in the driveline
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y10S 903/906 : Motor or generator
• CPC Class Codes: Y10S 903/947 : Characterized by control of braking, e.g. blending of regeneration, friction braking

Abstract

An apparatus and a method of controlling a motor are provided for reducing vibration of an electric vehicle that maximize regenerative energy by limiting a vibration reduction torque at a maximum regenerative braking torque region of a motor. The method includes comparing a battery state of charge (SOC) with a predetermined SOC when a regenerative braking of the electric vehicle is required and calculating a size of vibration component of the electric vehicle when the battery SOC is less than the predetermined SOC. Further, the size of vibration component is compared with a first predetermined value and a vibration reduction torque of a driving direction is limited when the size of vibration component is less than the first predetermined value.

Claims

1. A method of controlling a motor for reducing vibration of an electric vehicle, comprising:

comparing, by a controller, a battery state of charge (SOC) with a predetermined SOC when a regenerative braking of the electric vehicle is required;

calculating, by the controller, a size of vibration component of the electric vehicle when the battery SOC is less than the predetermined SOC;

comparing, by the controller, the size of vibration component with a first predetermined value;

limiting, by the controller, a vibration reduction torque of a driving direction when the size of vibration component is less than the first predetermined value;

comparing, by the controller, the size of vibration component with a second predetermined value when the size of vibration component is less than the first predetermined value;

reducing, by the controller, the vibration reduction torque of the driving direction when the size of vibration component is equal to or greater than the second predetermined value; and

limiting, by the controller, the vibration reduction torque of the driving direction when the size of vibration component is less than the second predetermined value.

2. The method of claim 1, further comprising:

maintaining, by the controller, the vibration reduction torque when the battery SOC is equal to or greater than the predetermined SOC.

3. The method of claim 1, further comprising:

maintaining, by the controller, the vibration reduction torque when the size of vibration component is equal to or greater than the first predetermined value.

4. The method of claim 1, wherein the vibration reduction torque of the driving direction is reduced by adjusting a gain of the vibration reduction torque.

5. An apparatus of controlling a motor for reducing vibration of an electric vehicle, comprising:

a driving information detector configured to detect a running state of the electric vehicle and demand information of a driver; and

a controller configured to determine a vibration reduction torque based on a signal from the driving information detector and adjust a motor torque,

wherein the controller is configured to calculate a size of vibration component when a regenerative braking of the electric vehicle is required and a battery state of charge (SOC) is less than a predetermined SOC, and adjust the vibration reduction torque based on comparing the size of vibration component with a first predetermined value, and

wherein the controller is further configured to;

compare the size of vibration component with a second predetermined value when the size of vibration component is less than the first predetermined value;

reduce the vibration reduction torque of a driving direction when the size of vibration component is equal to or greater than the second predetermined value; and

limit the vibration reduction torque of the driving direction when the size of vibration component is less than the second predetermined value.

6. The apparatus of claim 5, wherein the controller is configured to maintain the vibration reduction torque when the battery SOC is equal to or greater than the predetermined SOC.

7. The apparatus of claim 5, wherein the controller is configured to maintain the vibration reduction torque when the size of vibration component is equal to or greater than the first predetermined value.

8. The apparatus of claim 5, wherein the controller is configured to reduce the vibration reduction torque of the driving direction by adjusting a gain of the vibration reduction torque.

9. A non-transitory computer readable medium containing program instructions executed by a controller, the computer readable medium comprising:

program instructions that receive a running state of the electric vehicle and demand information of a driver;

program instructions that determine a vibration reduction torque based on the received information to adjust a motor torque;

program instructions that calculate a size of vibration component when a regenerative braking of the electric vehicle is required and a battery state of charge (SOC) is less than a predetermined SOC;

program instructions that adjust the vibration reduction torque based on comparing the size of vibration component with a first predetermined value;

program instructions that compare the size of vibration component with a second predetermined value when the size of vibration component is less than the first predetermined value;

program instructions that reduce the vibration reduction torque of a driving direction when the size of vibration component is equal to or greater than the second predetermined value; and

program instructions that limit the vibration reduction torque of the driving direction when the size of vibration component is less than the second predetermined value.

10. The non-transitory computer readable medium of claim 9, further comprising:

program instructions that maintain the vibration reduction torque when the battery SOC is equal to or greater than the predetermined SOC.

11. The non-transitory computer readable medium of claim 9, further comprising:

program instructions that maintain the vibration reduction torque when the size of vibration component is equal to or greater than the first predetermined value.

12. The non-transitory computer readable medium of claim 9, further comprising:

program instructions that reduce the vibration reduction torque of the driving direction by adjusting a gain of the vibration reduction torque.