Method for controlling idle stop-and-go system

• US 20050103302A1
• Filed: 11/17/2004
• Published: 05/19/2005
• Est. Priority Date: 11/17/2003
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Inventors: You, Sung Il
• Granted Patent: US 7,080,617 B2
• Time in Patent Office: Days
• US Class Current: 123/179.400
• CPC Class Codes: F02D 2041/1411 using a finite or infinite state machine, automaton or state graph for controlling or modelling
• CPC Class Codes: F02N 11/006 using a plurality of electric motors
• CPC Class Codes: F02N 11/0814 comprising means for controlling automatic idle-start-stop
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A system and method for controlling an idle stop-and-go in which an engine control mode is determined according to states and conditions of an engine, so that load calculation of the engine contact unit can be reduced and the engine and the integrated starter generator can be stably controlled.

Claims

1. A method for controlling an idle stop-and-go system based on one or more engine control modes, wherein the one or more engine control modes comprise:

a starting mode, wherein an engine control unit (ECU) starts an engine by an engine stop release signal received from a starter/generator control unit (SCU);

a normal mode for normally operating the engine; and

an after-run mode, wherein the ECU stops the engine based on an engine stop signal received from the SCU.

2. The method of claim 1, wherein the ECU changes the engine control mode from the starting mode to the normal mode after the engine starts.

3. The method of claim 1, wherein the ECU changes the engine control mode to the after-run mode in the case that an ignition key is turned to an off position or an engine stop signal is received from the SCU at the normal mode.

4. The method of claim 1, wherein the ECU changes the engine control mode to the starting mode in the case that an engine stop releasing signal is received from the SCU at the after-run mode while an ignition key is in an on position.

5. The method of claim 1, wherein the ECU changes the engine control mode to the after-run mode in the case that an ignition key is turned to an off position at the starting mode.

6. The method of claim 1, wherein the ECU changes the engine control mode to the starting mode if an engine speed is less than a predetermined speed for a predetermined period and an error code occurs in the ECU.

7. An engine idle stop-and-go control system, comprising:

an engine control unit,

a starter generator control unit interconnected with the engine control unit;

a starter motor configured for initial engine starting; and

an integrated starter generator controlled by the starter generator control unit, said starter generator configured for engine restarts when engine coolant temperature is higher than a preset threshold temperature;

wherein said engine control unit is programmed with plural operating modes, comprising;

a starting mode wherein the engine control unit starts the engine in response to an engine stop release signal received from the starter generator control unit;

a normal mode for normally operating the engine; and

an after-run mode wherein the engine control unit stops the engine based on an engine stop signal received from the starter generator control unit.

8. The system of claim 7, wherein the engine control unit is programmed to change the engine control mode from the starting mode to the normal mode after the engine starts.

9. The system of claim 7, wherein the engine control unit is programmed to change the engine control mode to the after-run mode in the case that an ignition key is turned to off or an engine stop signal is received from the starter generator control unit while in the normal mode.

10. The system of claim 7, wherein the engine control unit is programmed to change the engine control mode to the starting mode in the case that an engine stop releasing signal is received from the starter generator control unit while in the after-run mode when an ignition key is on.

11. The system of claim 7, wherein the engine control unit is programmed to change the engine control mode to the after-run mode in the case that an ignition key is turned to off while in the starting mode.

12. The system of claim 7, wherein the engine control unit is programmed to change the engine control mode to the starting mode if engine speed is less than a predetermined speed for a predetermined period and an error code occurs in the engine control unit.

13. An engine idle stop-and-go control system, comprising:

an engine control unit; and

a starter generator control unit interconnected with the engine control unit;

wherein said engine control unit is programmed with instructions comprising;

plural operating modes, including a starting mode wherein the engine control unit starts the engine in response to an engine stop release signal received from the starter generator control unit, a normal mode for normally operating the engine, and an after-run mode wherein the engine control unit stops the engine based on an engine stop signal received from the starter generator control unit;

changing the engine control mode from the starting mode to the normal mode after the engine starts;

changing the engine control mode to the after-run mode in the case that an ignition key is turned to off or an engine stop signal is received from the starter generator control unit while in the normal mode;

changing the engine control mode to the starting mode in the case that an engine stop releasing signal is received from the starter generator control unit while in the after-run mode when an ignition key is on;

changing the engine control mode to the after-run mode in the case that an ignition key is turned to off while in the starting mode; and

changing the engine control mode to the starting mode if engine speed is less than a predetermined speed for a predetermined period and an error code occurs in the engine control unit.