ANTI-JERK CONTROL APPARATUS AND METHOD FOR HYBRID ELECTRIC VEHICLE

• US 20110112709A1
• Filed: 09/30/2010
• Published: 05/12/2011
• Est. Priority Date: 11/06/2009
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Kia Corp.)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Kia Corp.)
• Inventors: Ihm, Hyung Bin, Lee, Tae Hoon, Park, Tae Wook, Park, Joon Young
• Granted Patent: US 9,008,941 B2
• Time in Patent Office: Days
• US Class Current: 701/22
• CPC Class Codes: B60K 2006/268 Electric drive motor starts the engine, i.e. used as starter motor
• 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 6/448 Electrical distribution type
• CPC Class Codes: B60K 6/48 Parallel type
• 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: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 2050/0037 Mathematical models of vehicle sub-units
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: B60W 30/19 Improvement of gear change, e.g. by synchronisation or smoothing gear shift
• CPC Class Codes: B60W 30/20 Reducing vibrations in the driveline
• CPC Class Codes: B60W 40/105 Speed
• CPC Class Codes: H02P 6/10 Arrangements for controlling torque ripple, e.g. providing reduced torque ripple
• CPC Class Codes: H02P 7/2855 whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• 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

Abstract

The present invention relates to an anti-jerk control apparatus and method for an Hybrid Electric Vehicle (HEV).

The anti-jerk control apparatus includes a model speed calculation unit for calculating a model speed of the motor in a state in which a vibration of a drive shaft is not considered. A vibration occurrence determination unit detects a speed vibration component while calculating a reference speed difference and an average speed difference from differences between the model speed and an actual speed of the motor, thus determining whether a vibration occurs on the drive shaft. A torque correction value calculation unit calculates a motor torque correction value for anti-jerk required to damp the vibration of the drive shaft, and controls torque of the motor if the vibration occurrence determination unit determines that the vibration occurs on the drive shaft.

Claims

1. An anti-jerk control apparatus for a Hybrid Electric Vehicle (HEV) in which an engine, a motor and an automatic transmission are disposed in a collinear fashion on one shaft and a clutch is disposed between the engine and the motor, comprising:

a model speed calculation unit for calculating a model speed of the motor in a state in which a vibration of a drive shaft is not considered;

a vibration occurrence determination unit for detecting a speed vibration component while calculating a reference speed difference and an average speed difference from differences between the model speed and an actual speed of the motor, thus determining whether a vibration occurs on the drive shaft; and

a torque correction value calculation unit for, if the vibration occurrence determination unit determines that the vibration occurs on the drive shaft, calculating a motor torque correction value for anti-jerk required to damp the vibration of the drive shaft, and controlling torque of the motor.

2. The anti-jerk control apparatus of claim 1, wherein the torque correction value calculation unit controls the torque of the motor using negative feedback control so that the difference between the model speed and the actual speed of the motor becomes 0.

3. An anti-jerk control method for a Hybrid Electric Vehicle (HEV), comprising:

calculating a model speed of a motor in a state in which a vibration of a drive shaft is not considered;

calculating an actual speed of the motor;

obtaining differences between the model speed and the actual speed of the motor, thus calculating a reference speed difference and an average speed difference;

comparing the reference speed difference with the average speed difference, and determining that a vibration of the drive shaft has occurred when a speed vibration component, obtained when the reference speed difference is greater or less than the average speed difference, is detected;

determining a motor torque correction value for anti-jerk required to damp the vibration of the drive shaft; and

controlling torque of the motor using negative feedback control allowing the motor torque correction value for anti-jerk to be applied so that the difference between the model speed and the actual speed of the motor becomes 0.

4. The anti-jerk control method of claim 3, wherein the motor torque correction value for anti-jerk is determined by an equation of [torque correction value=gain*((model speed−

actual speed)−

average speed difference)].

5. The anti-jerk control method of claim 4, wherein the gain is set to different values for cases requiring anti-jerk control, such as clutch releasing, gear changing, tip-in/out, and braking.

6. An anti-jerk control apparatus for a Hybrid Electric Vehicle (HEV) in which an engine, a motor and an automatic transmission are disposed in a collinear fashion on one shaft and a clutch is disposed between the engine and the motor, comprising:

a model speed calculation unit for calculating a model speed of the motor in a state in which a vibration of a drive shaft is not considered;

a vibration occurrence determination unit; and

a torque correction value calculation unit.

7. The anti-jerk control apparatus for a Hybrid Electric Vehicle (HEV) of claim 6, wherein the vibration occurrence determination unit is used for detecting a speed vibration component while calculating a reference speed difference and an average speed difference from differences between the model speed and an actual speed of the motor, thus determining whether a vibration occurs on the drive shaft.

8. The anti-jerk control apparatus for a Hybrid Electric Vehicle (HEV) of claim 6, wherein, if the vibration occurrence determination unit determines that the vibration occurs on the drive shaft, the torque correction value calculation unit calculates a motor torque correction value for anti-jerk required to damp the vibration of the drive shaft, and controls the torque of the motor.