Method of starting a hybrid vehicle

• US 20070113814A1
• Filed: 11/21/2005
• Published: 05/24/2007
• Est. Priority Date: 11/21/2005
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (General Motors Company)
• Inventors: Tamai, Goro, Aldrich, William
• Granted Patent: US 7,267,090 B2
• Time in Patent Office: Days
• US Class Current: 123/179.300
• CPC Class Codes: B60L 2240/445 Temperature
• CPC Class Codes: B60L 2260/56 Temperature prediction, e.g. for pre-cooling
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 58/20 having different nominal voltages
• CPC Class Codes: B60L 58/24 for controlling the temperature of batteries
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• 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 20/10 Controlling the power contribution of each of the prime movers to meet required power demand
• CPC Class Codes: B60W 2510/0676 Engine temperature
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2510/246 Temperature
• CPC Class Codes: B60W 30/192 Mitigating problems related to power-up or power-down of the driveline, e.g. start-up of a cold engine
• CPC Class Codes: F02N 11/006 using a plurality of electric motors
• CPC Class Codes: F02N 11/0866 comprising several power sources, e.g. battery and capacitor or two batteries
• CPC Class Codes: F02N 11/14 Starting of engines by means of electric starters with external current supply F02N11/12 takes precedence
• CPC Class Codes: F02N 2200/063 Battery voltage
• CPC Class Codes: F02N 2200/064 Battery temperature
• 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

Abstract

A method of performing a first start of an internal combustion engine of a hybrid electro-mechanical vehicle includes activating an auxiliary power module prior to the engine starting to direct power stored in a high voltage battery (used for powering the motor/generator(s) on the hybrid vehicle) through the auxiliary power module at a voltage level of a low voltage battery to assist the low voltage battery in powering a starter motor for starting the internal combustion engine.

Claims

1. A method of performing a first start of an internal combustion engine of a hybrid electro-mechanical vehicle having a motor/generator powerable by a high voltage battery characterized by a first voltage and a starter motor for starting the internal combustion engine powerable by a low voltage battery characterized by a second voltage less than the first voltage, the method comprising:

activating an auxiliary power module prior to the engine starting to thereby direct power stored in the high voltage battery through the auxiliary power module at the second voltage to assist the low voltage battery in powering the starter motor.

2. The method of claim 1, wherein said activating step comprises charging the low voltage battery with the power directed through the auxiliary power module.

3. The method of claim 2, wherein said charging the low voltage battery occurs for a predetermined amount of time.

4. The method of claim 3, further comprising:

relaying a signal to attempt key-crank.

5. The method of claim 1, wherein said activating the auxiliary power module step comprises providing the power directed through the auxiliary power module to the starter motor in parallel with power provided by the low voltage battery.

6. The method of claim 1, further comprising:

determining whether key-crank has occurred;

wherein said activating the auxiliary power module step comprises charging the low voltage battery with the power directed through the auxiliary power module if key-crank has not occurred; and

wherein said activating the auxiliary power module step comprises providing the power directed through the auxiliary power module to the starter motor in parallel with power provided by the low voltage battery if key-crank has occurred.

7. The method of claim 1, further comprising:

prior to said activating the auxiliary power module step, monitoring at least one of voltage level of the low voltage battery, temperature of the low voltage battery and temperature of the engine;

after said monitoring step, comparing said at least one of voltage level of the low voltage battery, temperature of the low voltage battery and temperature of the engine with a predetermined voltage level, a first predetermined temperature, and one of said first predetermined temperature and a second predetermined temperature, respectively; and

wherein said activating the auxiliary power module step occurs if said monitored voltage level is less than said predetermined voltage level, said monitored low voltage battery temperature is below said first predetermined temperature or said monitored engine temperature is below said one of said first and said second predetermined temperature.

8. The method of claim 1, further comprising:

prior to said activating the auxiliary power module step, identifying a predetermined series of driver input, wherein said activating step is in response to said identifying step.

9. A method of performing a first start of an internal combustion engine of a hybrid electro-mechanical vehicle having a motor/generator powerable by a high voltage battery characterized by a first voltage and a starter motor for starting the internal combustion engine, the starter motor being powerable by a low voltage battery characterized by a second voltage less than the first voltage, the method comprising:

monitoring at least one of voltage level of the low voltage battery, temperature of the low voltage battery and temperature of the engine;

after said monitoring step, comparing said at least one of voltage level of the low voltage battery, temperature of the low voltage battery and temperature of the engine with a predetermined voltage level, a first predetermined temperature, and one of said first predetermined temperature and a second predetermined temperature, respectively; and

activating an auxiliary power module to thereby direct power stored in the high-voltage battery through the auxiliary power module at the second voltage to assist the low voltage battery in powering the starter motor, wherein said activating the auxiliary power module step occurs if said monitored voltage level is less than said predetermined voltage level, said monitored low voltage battery temperature is less than said first predetermined temperature or said monitored engine temperature is less than said one of said first and said second predetermined temperature.

10. The method of claim 9, further comprising:

determining whether key-crank has occurred;

wherein said activating the auxiliary power module step comprises charging the low voltage battery with the power directed through the auxiliary power module if key-crank has not occurred; and

wherein said activating the auxiliary power module step comprises providing the power directed through the auxiliary power module to the starter motor in parallel with power provided by the low voltage battery if key-crank has occurred.

11. A method of performing a first start of an internal combustion engine of a hybrid electro-mechanical vehicle having a motor/generator powerable by a high voltage battery characterized by a first voltage and a starter motor for starting the internal combustion engine, the starter motor being powerable by a low voltage battery characterized by a second voltage less than the first voltage, the method comprising:

monitoring at least one of voltage level of the low voltage battery, temperature of the low voltage battery and temperature of the engine;

after said monitoring step, comparing said at least one of voltage level of the low voltage battery, temperature of the low voltage battery and temperature of the engine with a predetermined voltage level, a first predetermined temperature, and one of said first predetermined temperature and said second predetermined temperature, respectively; and

activating an auxiliary power module to thereby direct power stored in the high voltage battery through the auxiliary power module at the second voltage to assist the low voltage battery in powering the starter motor, wherein said activating the auxiliary power module step occurs if said monitored voltage level is less than said predetermined voltage level, said monitored low voltage battery temperature is less than said first predetermined temperature or said monitored engine temperature is less than said one of said first and said second predetermined temperature;

determining whether key-crank has occurred;

wherein said activating the auxiliary power module step comprises charging the low voltage battery with the power directed through the auxiliary power module if key-crank has not occurred; and

wherein said activating the auxiliary power module step comprises providing the power directed through the auxiliary power module to the starter motor in parallel with power provided by the low voltage battery if key-crank has occurred.