Method of controlling change of travelling mode of hybrid vehicle and control apparatus thereof

• US 10,059,326 B2
• Filed: 02/22/2016
• Issued: 08/28/2018
• Est. Priority Date: 09/03/2015
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Inventors: Kim, Sang Joon, Park, Joonyoung
• Primary Examiner(s): Tran, Khoi H
• Assistant Examiner(s): Nguyen, Robert T
• Application Number:
  US15/049,954
• Publication Number:
  US 20170066431A1
• Time in Patent Office: 918 Days
• CPC Class Codes: B60K 2006/4825 Electric machine connected or connectable to gearbox input shaft
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• 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 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 20/20 Control strategies involving selection of hybrid configuration, e.g. selection between series or parallel configuration
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2510/305 Power absorbed by auxiliaries
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2710/021 Clutch engagement state
• CPC Class Codes: B60W 2710/06 Combustion engines, Gas turbines
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 2710/08 Electric propulsion units
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: B60Y 2200/92 Hybrid vehicles
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y10S 903/904 Component specially adapted for hev
• CPC Class Codes: Y10S 903/93 Conjoint control of different elements

Abstract

A method of controlling a change of a travelling mode of a hybrid vehicle is provided. The method includes calculating, by a controller, system required power required by a device mounted within a hybrid vehicle and calculating a reference power. A travelling mode of the hybrid vehicle is then changed from an electric vehicle (EV) mode to a hybrid electric vehicle (HEV) mode by operating an engine clutch to be connected when the system required power is greater than the reference power. The system required power is a value obtained by adding driver required power and power required by an auxiliary load device of the hybrid vehicle, and the reference power is power when a state of charge (SOC) of the battery providing power to the device of the hybrid vehicle is maintained in a normal region.

Claims

1. A method of controlling a change of a travelling mode of a hybrid vehicle, comprising:

calculating, by a controller, a system required power required by a device mounted within a hybrid vehicle;

calculating, by the controller, a reference power; and

adjusting, by the controller, a travelling mode of the hybrid vehicle from an electric vehicle (EV) mode to a hybrid electric vehicle (HEV) mode by operating an engine clutch disposed between an engine and a driving motor to be coupled when the system required power is greater than the reference power,

wherein the system required power is a value obtained by adding a driver required power and a power required by an auxiliary load device of the hybrid vehicle,

wherein the reference power is power when a state of charge (SOC) of the battery configured to provide power to the device of the hybrid vehicle is maintained in a normal region in which the state of charge of the battery is a first reference value or more and a second reference value or less in order to prevent loss of energy efficiency according to an energy circulation performed by the engine, the battery, and the driving motor, and

wherein the power required by the auxiliary load device is set by a value obtained by multiplying consumed power of the auxiliary load device by a weighting factor, and when the SOC of the battery is lower than a threshold value, the weighting factor is set to be larger than a factor value, and when the SOC of the battery is higher than the threshold value, the weighting factor is set to be smaller than the factor value.

2. The method of claim 1, further comprising:

calculating, by the controller, the driver required power in response to an acceleration pedal engagement amount signal output from an acceleration pedal sensor (APS).

3. The method of claim 1, further comprising:

calculating, by the controller, the driver required power in response to a cruise control request signal.

4. The method of claim 1, wherein the auxiliary load device includes a low voltage direct current-direct current (DC-DC) converter, an air conditioner, or a heater.

5. A method of controlling a change of a travelling mode of a hybrid vehicle, comprising:

calculating, by a controller, a system required power required by a device mounted within a hybrid vehicle;

calculating, by the controller, a reference power; and

adjusting, by the controller, a travelling mode of the hybrid vehicle from an electric vehicle (EV) mode to a hybrid electric vehicle (HEV) mode by operating an engine clutch to be connected when the system required power is greater than the reference power,

wherein the system required power is a value obtained by adding a driver required power and a power required by an auxiliary load device of the hybrid vehicle, and

wherein the calculation of the reference power includes;

setting, by the controller, power when a state of charge (SOC) of a battery configured to provide power to the device of the hybrid vehicle is maintained in a normal region in which the state of charge of the battery is a first reference value or more and a second reference value or less in order to prevent loss of energy efficiency according to an energy circulation performed by the engine, the battery, and the driving motor, as first reference power;

setting, by the controller, power when the SOC of the battery set based on available power of a battery system including the battery is maintained in the normal region as second reference power;

setting, by the controller, power when the SOC of the battery set based on available power of a motor system including the driving motor of the hybrid vehicle configured to receive power from the battery is maintained in the normal region as third reference power; and

setting, by the controller, a minimum value among the first reference power, the second reference power, and the third reference power as the reference power.

6. The method of claim 5, wherein when the SOC of the battery is lower than a threshold value, the first reference power is set to be smaller than a power value, and when the SOC of the battery is higher than the threshold value, the first reference power is set to be larger than the power value.

7. An apparatus for controlling a change of a travelling mode of a hybrid vehicle, comprising:

an acceleration pedal sensor (APS) configured to detect a pedal engagement amount of an acceleration pedal; and

a controller configured to calculate system required power that is a value obtained by adding a driver required power required by a device mounted within a hybrid vehicle and a power required by an auxiliary load device of the hybrid vehicle, and calculate reference power that is power when a state of charge (SOC) of a battery configured to provide power to a system of the hybrid vehicle is maintained in a normal region in which the state of charge of the battery is a first reference value or more and a second reference value or less in order to prevent loss of energy efficiency according to an energy circulation performed by the engine, the battery, and the driving motor,

wherein the controller is configured to adjust a travelling mode of the hybrid vehicle from an electric vehicle (EV) mode to a hybrid electric vehicle (HEV) mode by operating an engine clutch to be connected in response to determining that the system required power is greater than the reference power,

wherein the controller is configured to calculate the driver required power in response to an acceleration pedal engagement amount signal,

wherein the controller is configured to set power when a state of charge (SOC) of a battery configured to provide power to the device of the hybrid vehicle is maintained in the normal region as first reference power,

wherein the controller is configured to set power when the SOC of the battery set based on available power of a battery system including the battery is maintained in the normal region as second reference power,

wherein the controller is configured to set power when the SOC of the battery set based on available power of a motor system including the driving motor of the hybrid vehicle configured to receive power from the battery is maintained in the normal region as third reference power, and

wherein the controller is configured to set a minimum value among the first reference power, the second reference power, and the third reference power as the reference power.

8. The apparatus of claim 7, wherein when the SOC of the battery is lower than a threshold value, the first reference power is set to be smaller than a power value, and when the SOC of the battery is higher than the threshold value, the first reference power is set to be larger than the power value.