Method for controlling mild hybrid vehicle

• US 10,322,710 B1
• Filed: 06/20/2018
• Issued: 06/18/2019
• Est. Priority Date: 12/18/2017
• 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: Jang, Hwa Yong
• Primary Examiner(s): Gurari, Erez
• Application Number:
  US16/013,080
• Publication Number:
  US 20190184968A1
• Time in Patent Office: 363 Days
• CPC Class Codes: B60K 2006/268 Electric drive motor starts the engine, i.e. used as starter motor
• CPC Class Codes: B60K 6/24 characterised by the combustion engines
• CPC Class Codes: B60K 6/26 characterised by the motors or the generators
• CPC Class Codes: B60K 6/485 Motor-assist type
• 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 20/10 Controlling the power contribution of each of the prime movers to meet required power demand
• CPC Class Codes: B60W 2050/0045 using databus protocols
• CPC Class Codes: B60W 2510/0633 Turbocharger state
• CPC Class Codes: B60W 2510/0657 Engine torque
• CPC Class Codes: B60W 2510/0676 Engine temperature
• CPC Class Codes: B60W 2510/068 Engine exhaust temperature
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2710/0627 Fuel flow rate
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: B60W 30/1843 Overheating of driveline components B60W30/186 takes precedence
• CPC Class Codes: B60Y 2400/435 Supercharger or turbochargers
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

A method for controlling a mild hybrid vehicle may include determining, by a controller, whether an engine of the mild hybrid vehicle operates based on a demand torque of a driver of the mild hybrid vehicle; determining, by the controller, a torque of a starter-generator of the mild hybrid vehicle that assists a torque of the engine according to the demand torque of the driver based on a temperature of a turbocharger of the mild hybrid vehicle when the engine is operated; and operating, by the controller, the starter-generator to assist the torque of the engine based on the determined torque of the starter-generator.

Claims

1. A method for controlling a mild hybrid vehicle, the method comprising:

determining, by a controller, whether an engine of the mild hybrid vehicle operates based on a demand torque of a driver of the mild hybrid vehicle;

determining, by the controller, a torque of a starter-generator of the mild hybrid vehicle that assists a torque of the engine according to the demand torque of the driver based on a temperature of a turbocharger of the mild hybrid vehicle when the engine is operated; and

operating, by the controller, the starter-generator to assist the torque of the engine based on the determined torque of the starter-generator.

2. The method of claim 1, wherein the torque of the starter-generator increases when the temperature of the turbocharger is increased.

3. The method of claim 1, wherein the determining of the torque of the starter-generator includes:

determining, by the controller, whether a state of charge (SOC) value of a battery that supplies electric power to the starter-generator exceeds a reference value after receiving the temperature of the turbocharger,

wherein the controller is configured to determine the torque of the starter-generator when the SOC value of the battery is determined by the controller to exceed the reference value.

4. The method of claim 3, wherein, when the SOC value of the battery is determined by the controller to be less than or equal to the reference value, the controller is configured to determine that the starter-generator does not assist the torque of the engine and is configured to control the engine to generate a torque corresponding to the demand torque of the driver.

5. The method of claim 3, wherein, when the temperature of the turbocharger is determined by the controller to exceed a temperature at which the turbocharger is burned and the SOC value of the battery is determined by the controller to be less than or equal to the reference value, the controller is configured to prohibit fuel injection to the engine for an operation of the engine to stop the operation of the engine.

6. The method of claim 1, wherein the determining of the torque of the starter-generator includes:

determining, by the controller, whether a state of charge (SOC) value of a battery that supplies electric power to the starter-generator exceeds a reference value after receiving the temperature of the turbocharger and having determined that the received temperature is within a predetermined range,

wherein the controller is configured to determine the torque of the starter-generator when the controller determines that the SOC value of the battery exceeds the reference value.

7. The method of claim 6, wherein, when the SOC value of the battery is determined by the controller to be is less than or equal to the reference value, the controller is configured to determine that the starter-generator does not assist the torque of the engine and is configured to control the engine to generate a torque corresponding to the demand torque of the driver.

8. The method of claim 7, wherein, when the temperature of the turbocharger exceeds a maximum value of the predetermined range, the maximum value at which the turbocharger is burned, and when the SOC value of the battery is determined by the controller to be is less than or equal to the reference value, the controller is configured to prohibit fuel injection to the engine for an operation of the engine to stop the operation of the engine.

9. The method of claim 1, further including:

confirming, by the controller, that a vehicle including the starter-generator is the mild hybrid vehicle when the controller receives a signal corresponding to a first controller area network identification from the starter-generator to which the first controller area network identification is assigned.

10. The method of claim 9, further including:

confirming, by the controller, that the vehicle including the starter-generator is the mild hybrid vehicle including the turbocharger when the controller receives a signal corresponding to a second controller area network identification from the turbocharger to which the second controller area network identification is assigned.