System and method of securing brake booster negative pressure

Patent metadata

Field	Value
Publication number	US-10975811-B2
Application number	US-201916699908-A
Country	US
Kind code	B2
Filing date	Dec 2, 2019
Priority date	Apr 22, 2019
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

A method of securing brake booster negative pressure is provided. The method includes operating a purge pump that is connected to a canister having evaporation gas absorbed thereon and a brake booster and determining whether the evaporation gas is injected into an intake pipe by the operation of the purge pump. Whether a negative pressure of the brake booster is insufficient is determined and when the evaporation gas is being injected into the intake pipe and the negative pressure is insufficient, a degree of opening of a valve provided in a line connecting the canister and the purge pump is adjusted.

First claim

What is claimed is:

1. A method of securing brake booster negative pressure, comprising:
operating, by a controller, a purge pump connected to a canister having evaporation gas absorbed thereon and a brake booster;
determining, by the controller, whether the evaporation gas is injected into an intake pipe by the operation of the purge pump; and
determining, by the controller, whether a negative pressure of the brake booster is insufficient,
wherein when the evaporation gas is being injected into the intake pipe and the negative pressure is insufficient, a degree of opening of a valve provided in a line connecting the canister and the purge pump is adjusted,
wherein when the negative pressure is insufficient in a state in which the evaporation gas is being injected into the intake pipe and the degree of opening of the valve is adjusted, and operation state of a convenience electronic device mounted to a vehicle is adjusted, and
wherein the convenience electronic device is repeatedly turned on and off at intervals shorter than a particular period of time when or after an operation thereof is stopped for the particular period of time, or the convenience electronic device is repeatedly turned on and off at increasing intervals for the particular period of time after the operation thereof is stopped for the particular period of time.

2. The method of claim 1 , wherein a rotational speed of the purge pump is gradationally adjusted to inject the evaporation gas into the intake pipe at a desired concentration.

3. The method of claim 1 , wherein when the negative pressure is insufficient in a state in which the evaporation gas is being injected into the intake pipe, the degree of opening of the valve is adjusted, and the operation state of the convenience electronic device is adjusted, an operation of an intake valve is adjusted.

4. The method of claim 3 , wherein a closing timing of the intake valve is advanced based on a top dead center, and an opening/closing length of the intake valve protruding to a combustion chamber is decreased.

5. The method of claim 3 , wherein an opening timing of the intake valve is advanced based on a top dead center, and an opening/closing length of the intake valve protruding to a combustion chamber is maintained.

6. The method of claim 3 , wherein when the negative pressure is insufficient in a state in which the evaporation gas is being injected into the intake pipe, the degree of opening of the valve is adjusted, the operation state of the convenience electronic device is adjusted, and the opening/closing timing of the intake valve is adjusted, an ignition timing of a mixture reaching a combustion chamber is adjusted.

7. The method of claim 6 , wherein the ignition timing is advanced based on a top dead center.

8. The method of claim 1 , wherein when the evaporation gas is not being injected into the intake pipe, the degree of opening of the valve provided in the line connecting the canister and the purge pump is adjusted.

9. A system of securing brake booster negative pressure, comprising:
a memory configured to store program instructions; and
a processor configured to execute the program instructions, the program instructions when executed configured to:
operate a purge pump connected to a canister having evaporation gas absorbed thereon and a brake booster;
determine whether the evaporation gas is injected into an intake pipe by the operation of the purge pump; and
determine whether a negative pressure of the brake booster is insufficient,

wherein when the evaporation gas is being injected into the intake pipe and the negative pressure is insufficient, a degree of opening of a valve provided in a line connecting the canister and the purge pump is adjusted,
wherein when the negative pressure is insufficient in a state in which the evaporation gas is being injected into the intake pipe and the degree of opening of the valve is adjusted, and operation state of a convenience electronic device mounted to a vehicle is adjusted, and
wherein the convenience electronic device is repeatedly turned on and off at intervals shorter than a particular period of time when or after an operation thereof is stopped for the particular period of time, or the convenience electronic device is repeatedly turned on and off at increasing intervals for the particular period of time after the operation thereof is stopped for the particular period of time.

10. The system of claim 9 , wherein a rotational speed of the purge pump is gradationally adjusted to inject the evaporation gas into the intake pipe at a desired concentration.

11. The system of claim 9 , wherein when negative pressure is insufficient in a state in which the evaporation gas is being injected into the intake pipe, the degree of opening of the valve is adjusted, and the operation state of the convenience electronic device is adjusted, an operation of an intake valve is adjusted.

12. The system of claim 11 , wherein a closing timing of the intake valve is advanced based on a top dead center, and an opening/closing length of the intake valve protruding to a combustion chamber is decreased.

13. The system of claim 11 , wherein an opening timing of the intake valve is advanced based on a top dead center, and an opening/closing length of the intake valve protruding to a combustion chamber is maintained.

14. The system of claim 11 , wherein when the negative pressure is insufficient in a state in which the evaporation gas is being injected into the intake pipe, the degree of opening of the valve is adjusted, the operation state of the convenience electronic device is adjusted, and the opening/closing timing of the intake valve is adjusted, an ignition timing of a mixture reaching a combustion chamber is adjusted.

15. The system of claim 14 , wherein the ignition timing is advanced based on a top dead center.

16. The system of claim 9 , wherein when the evaporation gas is not being injected into the intake pipe, the degree of opening of the valve provided in the line connecting the canister and the purge pump is adjusted.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Oh Young-Kyu
• Kim Youn-Su
• Park Keum-Jin

Classifications

• F02M25/0854

  Details of the absorption canister · CPC title

• F02D41/004

  Control of the valve or purge actuator, e.g. duty cycle, closed loop control of position · CPC title

• B60T17/02

  Arrangements of pumps or compressors, or control devices therefor · CPC title

• B60T13/52 Primary

  indirect, i.e. vacuum booster units · CPC title

• F02M25/089

  Layout of the fuel vapour installation · CPC title