Device and method for controlling purge of vehicle

Patent metadata

Field	Value
Publication number	US-11466630-B2
Application number	US-201916692495-A
Country	US
Kind code	B2
Filing date	Nov 22, 2019
Priority date	Jul 17, 2019
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

A device for controlling purge of a vehicle includes: a state detector detecting state information to control purge of an engine; a controller generating an amount of fuel of each of cylinders of the engine using an amount of air of each cylinder, compensation information, a lambda control value, and an amount of a purge gas of the engine, checking a purge distribution coefficient according to an amount of an intake air for each cylinder when the state information satisfies a control entry condition, generating an amount of redistribution of the purge gas using the amount of the purge gas and the purge distribution coefficient, and generating an injection time for each cylinder using the amount of fuel, a conversion coefficient, and the amount of redistribution of the purge gas; and an injector injecting fuel in each cylinder during the injection time based on control of the controller.

First claim

What is claimed is:

1. A device for controlling purge of an evaporation gas of a fuel tank collected in a canister of a vehicle, the device comprising:
a state detector configured to acquire state information to control purge of an engine of the vehicle;
a controller configured to:
generate an amount of fuel supplied to each of a plurality of cylinders of the engine using an amount of air from each of the plurality of cylinders, compensation information a lambda control value, and an amount of a purge gas of the engine,
check a purge distribution coefficient based on an amount of an intake air for each of the plurality of cylinders and cylinder information that is a number indicating an order of each of the plurality of cylinders when the state information satisfies a control entry condition,
generate an amount of redistribution of the purge gas using the amount of the purge gas and the purge distribution coefficient, and
generate an injection time for each of the plurality of cylinders using the amount of fuel, a conversion coefficient for converting the amount of fuel to the injection time, and the amount of redistribution of the purge gas; and

an injector configured to inject fuel in each of the plurality of cylinders during the injection time based on control of the controller,
wherein the compensation information includes a temperature compensation coefficient, an injector deviation coefficient, a lambda compensation coefficient, or a speed compensation coefficient,
wherein the state information comprises a duty cycle of a purge valve transferring the purge gas and further includes the lambda control value,
wherein the controller is configured to determine that the state information satisfies the control entry condition when the duty cycle of the purge valve is greater than or equal to a first reference value and the lambda control value is less than a second reference value,
wherein the state information further comprises a ratio of a flow amount of the purge gas transferring the purge valve to the amount of air, a number of rotation of the engine, and an engine roughness difference value between the cylinders, and
wherein the controller is configured to determine that the state information satisfies the control entry condition when the ratio of the flow amount of the purge gas to the amount of air is greater than or equal to a third reference value, the number of rotation of the engine is less than a fourth reference value, and the engine roughness difference value between the cylinders is greater than or equal to a fifth reference value.

2. The device of claim 1 , wherein the controller is configured to generate the amount of the purge gas using a flow amount of the purge valve transferring the purge gas and a purge learning concentration value.

3. The device of claim 2 , wherein the controller is configured to generate the purge learning concentration value by performing an integral control using a lambda detection value, a compensation coefficient based on a ratio of the flow amount of the purge valve to the amount of air, and a compensation coefficient based on an amount of fuel of the injector.

4. The device of claim 1 , wherein the engine includes a first cylinder, a second cylinder, a third cylinder, and a fourth cylinder, and
wherein the controller is configured to generate the engine roughness difference value by calculating a difference value between an average value of engine roughness of the fourth cylinder and an average value of engine roughness of one of the first cylinder, the second cylinder, and the third cylinder.

5. The device of claim 1 , wherein the controller is configured to check a setting map matching information of each of the plurality of cylinders and the amount of the intake air with the purge distribution coefficient and to extract the purge distribution coefficient matched to the cylinder information and the amount of the intake air.

6. The device of claim 1 , wherein the controller is configured to generate a lambda distribution coefficient using the lambda control value and the purge distribution coefficient and to generate the injection time using the amount of fuel, the conversion coefficient, the amount of redistribution of the purge gas, and the lambda distribution coefficient.

7. A method for controlling purge of an evaporation gas of a fuel tank collected in a canister of a vehicle, the method comprising:
checking, by a controller, state information;
generating, by the controller, an amount of fuel supplied to each of a plurality of cylinders of the engine using an amount of air from each of the plurality of cylinders, compensation information a lambda control value, and an amount of a purge gas of the engine;
determining, by the controller, whether the state information satisfies a control entry condition;
checking, by the controller, a purge distribution coefficient based on an amount of an intake air for each of the plurality of cylinders and information that is a number indicating an order of each of the plurality of cylinders when the state information satisfies the control entry condition;
generating, by the controller, an amount of redistribution of the purge gas using the amount of the purge gas and the purge distribution coefficient; and
generating, by the controller, an injection time for each of the plurality of cylinders using the amount of fuel, a conversion coefficient for converting the amount of fuel to the injection time, and the amount of redistribution of the purge gas,
wherein the compensation information includes a temperature compensation coefficient, an injector deviation coefficient, a lambda compensation coefficient, or a speed compensation coefficient,
wherein the state information comprises a duty cycle of a purge valve transferring the purge gas and further includes the lambda control value,
wherein the determining whether the state information satisfies the control entry condition comprises:
determining, by the controller, that the state information satisfies the control entry condition when the duty cycle of the purge valve is greater than or equal to a first reference value, and the lambda control value is less than a second reference value, and
wherein the state information further comprises a ratio of a flow amount of the purge gas transferring a purge valve to the amount of air, a number of rotation of the engine, and an engine roughness difference value between the cylinders,
wherein the determining whether the state information satisfies the control entry condition comprises:
determining, by the controller, that the state information satisfies the control entry condition when the ratio of the flow amount of the purge gas to the amount of air is greater than or equal to a third reference value, the number of rotation of the engine is less than a fourth reference value, and the engine roughness difference value between the cylinders is greater than or equal to a fifth reference value.

8. The method of claim 7 , wherein the generating the amount of fuel comprises:
generating, by the controller, the amount of the purge gas using a flow amount of the purge valve transferring the purge gas and a purge learning concentration value; and
generating, by the controller, the amount of fuel using the amount of air of each of the plurality of cylinders, the temperature compensation coefficient, the injector deviation coefficient, the lambda compensation coefficient, or the speed compensation coefficient included in the compensation information, the lambda control value, and the amount of the purge gas.

9. The method of claim 8 , wherein the generating the amount of the purge gas comprises generating, by the controller, the purge learning conce

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Byeon Min
• Bae Howoong

Classifications

• F02D41/14

  Introducing closed-loop corrections · CPC title

• F02D41/1404 Primary

  Fuzzy logic control · CPC title

• F02D41/0045

  Estimating, calculating or determining the purging rate, amount, flow or concentration · CPC title

• F02D41/1498

  measuring engine roughness · CPC title

• F02D2041/1422

  Variable gain or coefficients · CPC title