Engine control system and method for hybrid electric vehicle

• US 20040046394A1
• Filed: 12/18/2002
• Published: 03/11/2004
• Est. Priority Date: 09/05/2002
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Inventors: Lim, Han-Seung
• Granted Patent: US 6,885,113 B2
• Time in Patent Office: Days
• US Class Current: 290/40C
• CPC Class Codes: B60K 6/485 Motor-assist type
• CPC Class Codes: B60K 6/54 Transmission for changing ratio
• CPC Class Codes: B60L 15/20 for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
• CPC Class Codes: B60L 2210/20 AC to AC converters
• CPC Class Codes: B60L 2240/445 Temperature
• CPC Class Codes: B60L 2240/486 Operating parameters
• CPC Class Codes: B60L 2240/80 Time limits
• CPC Class Codes: B60L 2260/22 Standstill, e.g. zero speed
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 2510/0676 Engine temperature
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: B60W 2540/06 Ignition switch
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 2540/16 Ratio selector position
• CPC Class Codes: B60W 30/18054 at stand still, e.g. engine in idling state hill holding B60W30/18118
• CPC Class Codes: F02D 41/0225 in relation with the gear ratio or shift lever position
• CPC Class Codes: F02D 41/042 for stopping the engine
• CPC Class Codes: F02N 11/0833 Vehicle conditions F02N11/0822, F02N11/0825 take precedence
• CPC Class Codes: F02N 2200/0802 : Transmission state, e.g. gear ratio or neutral state
• CPC Class Codes: F02N 2300/2011 : Control involving a delay; Control involving a waiting period before engine stop or engine start
• CPC Class Codes: Y02T 10/40 : Engine management systems
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y10S 903/917 : with transmission for changing gear ratio

Abstract

The present invention relates to an engine control system and method for a hybrid electric vehicle. The system includes an engine, a motor mounted to one side of the engine, and a controller receiving one or more signals indicating vehicle operational conditions, and performing control of operations of the engine and motor. The controller is programmed to perform control logic (i.e., the method) that includes determining if predetermined idle stop conditions are satisfied based on the one or more signals; performing control into an idle stop state if the predetermined idle stop conditions are satisfied; and discontinuing idle stop if, following detection of a reverse range On signal, it is determined that the reverse range On signal is maintained for a predetermined time interval.

Claims

1. An engine control method for a hybrid electric vehicle, comprising:

initiating an idle stop state if predetermined idle stop conditions are satisfied;

determining if a present shift range is a reverse R range if idle stop initiated;

determining if the reverse R range is maintained for a predetermined time interval if it is determined the present shift range is the reverse R range; and

disengaging idle stop if the reverse R range is maintained for the predetermined time interval.

2. The method of claim 1, wherein the idle stop conditions include (a) the ignition being in an On state, (b) a hybrid control unit being in a control preparation completion state, (c) an engine temperature being at a temperature equal to or greater than a predetermined temperature, (d) a vehicle speed being at or greater than a first predetermined speed for at least a predetermined time, (e) the vehicle speed being less than or equal to a second predetermined speed, (f) no pressure decrease in a brake booster, (g) a main battery maintaining a state of charge such that the motor can start the engine, (h) a shift range not being in the reverse R range, (i) a brake pedal being depressed, and (j) an accelerator pedal not being depressed.

3. The method of claim 2, further comprising disengaging idle stop if all the idle stop conditions except for the requirement that the shift range not be in the reverse R range are satisfied in the case where the reverse R range is not maintained for the predetermined time interval.

4. An engine control system for a hybrid electric vehicle, comprising:

an engine;

a motor mounted to one side of the engine; and

a controller receiving one or more signals indicating vehicle operational conditions, and performing control of operations of the engine and motor,

wherein the controller is programmed to perform control logic that includes determining if predetermined idle stop conditions are satisfied based on the one or more signals;

performing control into an idle stop state if the predetermined idle stop conditions are satisfied; and

discontinuing idle stop if, following detection of a reverse range On signal, it is determined that the reverse range On signal is maintained for a predetermined time interval.

5. The engine control system of claim 4, wherein the idle stop conditions include (a) the ignition being in an On state, (b) a hybrid control unit being in a control preparation completion state, (c) an engine temperature being at a temperature equal to or greater than a predetermined temperature, (d) a vehicle speed being at or greater than a first predetermined speed for at least a predetermined time, (e) the vehicle speed being less than or equal to a second predetermined speed, (f) no pressure decrease in a brake booster, (g) a main battery maintaining a state of charge such that the motor can start the engine, (h) a shift range not being in the reverse R range, (i) a brake pedal being depressed, and (j) an accelerator pedal not being depressed.

6. The engine control system of claim 5, wherein the control logic programmed into the controller further includes disengaging idle stop if all the idle stop conditions except for the requirement that the shift range not be in the reverse R range are satisfied in the case where the reverse R range is not maintained for the predetermined time interval.

7. An engine control method for an idle stop state in a hybrid electric vehicle, comprising:

determining if a present shift range is a reverse R range;

determining if the reverse R range is maintained for a predetermined time interval if it is determined the present shift range is the reverse R range; and

disengaging idle stop if the reverse R range is maintained for the predetermined time interval.

8. The method of claim 7, wherein the predetermined time interval is between about 100-300 milliseconds.

9. The method of claim 8, wherein said determining if the reverse range is maintained for a predetermined time comprises incrementing a counter and comparing said counter to a predetermined counter value.

10. The method of claim 8, wherein said predetermined time interval is about 200 milliseconds.