Method and system of controlling hybrid electric vehicle for removing residual purge gas

Patent metadata

Field	Value
Publication number	US-11118519-B2
Application number	US-201916524730-A
Country	US
Kind code	B2
Filing date	Jul 29, 2019
Priority date	Nov 30, 2018
Publication date	Sep 14, 2021
Grant date	Sep 14, 2021

Abstract

A method of controlling a hybrid electric vehicle is provided. The method includes determining whether a condition for turning off an engine is satisfied and determining engine clutch disengaging time and residual purge gas consuming time from engine driving status information when the condition is satisfied. Engine clutch-engaged charging control time is determined from the engine clutch disengaging time and the residual purge gas consuming time. The method includes closing a purge control solenoid valve and starting to perform engine clutch-engaged charging control. The engine clutch-engaged charging control is maintained for the determined engine clutch-engaged charging control time and then engine clutch disengaging control is performed for the determined engine clutch disengaging time. The engine is stopped after the engine clutch disengaging control is performed.

First claim

What is claimed is:

1. A system of controlling a hybrid electric vehicle, comprising:
a memory configured to store program instructions; and
a processor configured to execute the program instructions, the program instructions when executed configured to:
determine whether a condition for turning off an engine is satisfied in the hybrid electric vehicle that is equipped with a canister purge system;
determine engine clutch disengaging time and residual purge gas consuming time from engine driving status information when the condition for turning off the engine is satisfied;
determine engine clutch-engaged charging control time from the determined engine clutch disengaging time and the determined residual purge gas consuming time;
close a purge control solenoid valve and starting to perform engine clutch-engaged charging control for charging a battery by operating a motor with a generator that uses output power of the engine;
maintain the engine clutch-engaged charging control for the determined engine clutch-engaged charging control time and then performing engine clutch disengaging control for the determined engine clutch disengaging time; and
stop the engine after the engine clutch disengaging control is performed,
wherein residual purge gas that remains in a purge path between the purge control solenoid valve and the engine is transported into the engine during the engine clutch-engaged charging control and the engine clutch disengaging control and is combusted.

2. The system of claim 1 , wherein the canister purge system is an active purge system in which a pump suctions in purge gas from a canister and discharges the purge gas to an engine intake system.

3. The system of claim 1 , wherein the engine clutch disengaging time is a value determined based on engine torque of the engine driving status information.

4. The system of claim 3 , wherein the engine clutch disengaging time is determined by a map based on the engine torque, and, in the map, the higher value the engine torque has, the longer the engine clutch disengaging time is set to be.

5. The system of claim 1 , wherein the residual purge gas consuming time is a value determined based on the engine torque and engine revolutions per minute of the engine driving status information.

6. The system of claim 5 , wherein the residual purge gas consuming time is determined by the map based on the engine torque and the engine revolutions per minute, and, in the map, under the condition of a same number of the engine revolutions per minute, the higher the torque is, the shorter the residual purge gas consuming time is set to be.

7. The system of claim 6 , wherein in the map, under a condition of the same engine torque, the greater the number of the engine revolutions per minute is, the shorter the residual purge gas consuming time is set to be.

8. The system of claim 1 , wherein the engine clutch-engaged charging control time is determined as time that results from subtracting the determined engine clutch disengaging time from the determined residual purge gas consuming time.

9. The system of claim 1 , wherein the program instructions when executed are further configured to:
determine whether the residual purge gas is present in the purge path between the purge control solenoid valve and the engine using a sensor after the engine clutch-engaged charging control starts; and
perform the engine clutch-engaged charging control and the engine clutch disengaging control in response to determining that the residual purge gas is present in the purge path.

10. A method of controlling a hybrid electric vehicle, comprising:
determining, by a controller, whether a condition for turning off an engine is satisfied in the hybrid electric vehicle that is equipped with a canister purge system;
determining, by the controller, engine clutch disengaging time and residual purge gas consuming time from engine driving status information when the condition for turning off the engine is satisfied;
determining, by the controller, engine clutch-engaged charging control time from the determined engine clutch disengaging time and the determined residual purge gas consuming time;
closing, by the controller, a purge control solenoid valve and starting to perform engine clutch-engaged charging control for charging a battery by operating a motor with a generator that uses output power of the engine;
maintaining, by the controller, the engine clutch-engaged charging control for the determined engine clutch-engaged charging control time and then performing engine clutch disengaging control for the determined engine clutch disengaging time; and
stopping, by the controller, the engine after the engine clutch disengaging control is performed,
wherein residual purge gas that remains in a purge path between the purge control solenoid valve and the engine is transported into the engine during the engine clutch-engaged charging control and the engine clutch disengaging control and is combusted.

11. The method of claim 10 , wherein the canister purge system is an active purge system in which a pump suctions in purge gas from a canister and discharges the purge gas to an engine intake system.

12. The method of claim 10 , wherein the engine clutch disengaging time is a value determined based on engine torque of the engine driving status information.

13. The method of claim 12 , wherein the engine clutch disengaging time is determined by a map based on the engine torque, and, in the map, the higher value the engine torque has, the longer the engine clutch disengaging time is set to be.

14. The method of claim 10 , wherein the residual purge gas consuming time is a value determined based on the engine torque and engine revolutions per minute of the engine driving status information.

15. The method of claim 14 , wherein the residual purge gas consuming time is determined by the map based on the engine torque and the engine revolutions per minute, and, in the map, under the condition of a same number of the engine revolutions per minute, the higher the torque is, the shorter the residual purge gas consuming time is set to be.

16. The method of claim 15 , wherein in the map, under a condition of the same engine torque, the greater the number of the engine revolutions per minute is, the shorter the residual purge gas consuming time is set to be.

17. The method of claim 10 , wherein the engine clutch-engaged charging control time is determined as time that results from subtracting the determined engine clutch disengaging time from the determined residual purge gas consuming time.

18. The method of claim 10 , further comprising:
determining, by the controller, whether the residual purge gas is present in the purge path between the purge control solenoid valve and the engine using a sensor after the engine clutch-engaged charging control starts,
wherein, in response to determining that the residual purge gas is present in the purge path, performing, by the controller, the engine clutch-engaged charging control and the engine clutch disengaging control.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Lee Seung Han
• Park Il Kwon
• Lee Dae Heung
• Cho In Eok
• Seo Jeong Ho

Classifications

• Y02T10/62

  Hybrid vehicles · CPC title

• F02D2200/1002

  Output torque · CPC title

• B60Y2200/92

  Hybrid vehicles · CPC title

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title

• B60K2006/4825

  Electric machine connected or connectable to gearbox input shaft · CPC title