Air-fuel ratio control method reflecting brake booster inflow flow rate
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorMin-Kyu Won
Life of this patent
Estimating the term…
Abstract
An air-fuel ratio control method reflecting a brake booster inflow flow rate includes: determining a deviation between an actually measured pressure of an intake manifold and a model pressure of the intake manifold is equal to or greater than a predetermined value; determining that the deviation is caused by a brake operation; correcting an intake air amount by reflecting a flow rate flowing into the intake manifold from a brake booster; and performing an air-fuel ratio control based on the corrected intake air amount.
Claims15
An air-fuel ratio control method reflecting a brake booster inflow flow rate, the method comprising:
- measuring, by a manifold absolute pressure (MAP) sensor, an absolute pressure of an intake manifold of a vehicle;
- comparing, by a controller, the measured absolute pressure with a model pressure of the intake manifold calculated based on an intake air amount measured by an air flow sensor;
- determining, by the controller, whether a deviation between the measured absolute pressure and the model pressure of the intake manifold is equal to or greater than a predetermined value;
- determining, by the controller, whether the deviation is caused by a brake operation when the deviation is equal to or greater than the predetermined value;
- correcting, by the controller, the intake air amount based on a rate of a brake inflow flowing into the intake manifold from a brake booster when it is determined that the deviation is caused by the brake operation;
- calculating, by the controller, a cylinder intake air amount based on the corrected intake air amount;
- and
- performing, by the controller, an air-fuel ratio control based on the calculated cylinder intake air amount.
An air-fuel ratio control method reflecting a brake booster inflow flow rate, the method comprising:
- determining, by a controller, whether a deviation between an actually measured pressure of an intake manifold and a model pressure of the intake manifold calculated based on an intake air amount measured by an air flow sensor is equal to or greater than a predetermined value, wherein the actually measured pressure is measured by a manifold absolute pressure (MAP) sensor;
- determining, by the controller, whether the deviation is caused by a brake operation when the deviation has occurred between the actually measured pressure and the model pressure;
- calculating, by the controller, a cylinder intake air amount by using the actually measured pressure of the intake manifold measured by the MAP sensor when it is determined that the deviation is caused by the brake operation;
- and
- performing, by the controller, an air-fuel ratio control based on the calculated cylinder intake air amount.
Dependencies are inferred from the claim text.