System and method of controlling engine provided with dual continuously variable valve duration device

Patent metadata

Field	Value
Publication number	US-10823090-B2
Application number	US-201916511900-A
Country	US
Kind code	B2
Filing date	Jul 15, 2019
Priority date	Dec 4, 2018
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

A system of controlling an engine includes: an engine including a combustion chamber, an intake valve, an ignition switch, and an exhaust valve; a dual continuously variable valve duration device to adjust an intake duration of the intake valve and an exhaust duration of the exhaust valve; and a controller for adjusting an ignition timing of the ignition switch, the intake duration, and the exhaust duration based on a driving condition of the vehicle. In particular, until the temperature of the exhaust gas reaches a predetermined temperature after the engine starts, the controller sets the ignition timing to an ignition timing within a predetermined ignition timing range, sets the intake duration of the intake valve to an intake duration within a predetermined intake duration range, and increases the exhaust duration of the exhaust valve to a limit exhaust duration according to the set intake duration.

First claim

What is claimed is:

1. A system of controlling an engine provided with a dual continuously variable valve duration device, the system comprising:
the engine including:
a combustion chamber,
an intake valve configured to selectively supply air or a mixture of air and fuel to the combustion chamber,
an ignition switch provided in the combustion chamber, and
an exhaust valve configured to selectively discharge exhaust gas in the combustion chamber to an outside of the combustion chamber;

a dual continuously variable valve duration device configured to adjust an intake duration of the intake valve and an exhaust duration of the exhaust valve; and
a controller configured to adjust an ignition timing of the ignition switch, the intake duration, and the exhaust duration based on a driving condition of the vehicle, and
wherein until a temperature of the exhaust gas reaches at a predetermined temperature after the engine starts,
the controller is configured to:
set the ignition timing of the ignition switch to an ignition timing within a predetermined ignition timing range,
set the intake duration of the intake valve to an intake duration within a predetermined intake duration range, and
increase the exhaust duration of the exhaust valve to a limit exhaust duration determined based on the intake duration set by the controller.

2. The system of claim 1 , wherein before the controller adjusts the ignition timing, the intake duration and the exhaust duration, the controller is configured to determine an optimum ignition timing based on a target exhaust temperature of the exhaust gas and to set the ignition timing to be the optimum ignition timing, and the controller is configured to increase the exhaust duration to an optimum exhaust duration determined based on the target exhaust temperature and the optimum ignition timing.

3. The system of claim 2 , wherein after the temperature of the exhaust gas reaches the predetermined temperature,
the controller sets the ignition timing of the ignition switch to an ignition timing within the predetermined ignition timing range,
sets the intake duration of the intake valve to an intake duration within the predetermined intake duration range, and
increases the exhaust duration to the limit exhaust duration based on the set intake duration.

4. The system of claim 3 , wherein after the temperature of the exhaust gas reaches at the predetermined temperature,
the controller sets the ignition timing of the ignition switch to the optimum ignition timing for exhaust gas reduction,
sets the intake duration of the intake valve to an intake duration within the predetermined intake duration range, and
increases the exhaust duration of the exhaust valve to the optimum exhaust duration based on the target exhaust temperature and the set intake duration.

5. The system of claim 3 , wherein until the temperature of the exhaust gas reaches at the predetermined temperature, when a drive (D) range or a reverse (R) range of a gear shift lever is detected or an accelerator pedal is depressed,
the controller sets the ignition timing to an ignition timing within the predetermined ignition timing range,
sets the intake duration of the intake valve to an intake duration within the predetermined intake duration range, and
increases the exhaust duration to the optimum exhaust duration based on the target exhaust temperature and the set intake duration.

6. The system of claim 1 , further comprising: a three way catalyst configured to purify hydrocarbons, carbon monoxide, and nitrogen oxides contained in the exhaust gas downstream of the engine.

7. A method of controlling an engine provided with a dual continuously variable valve duration device, wherein the engine includes an intake valve, an ignition switch, and an exhaust valve, and the dual continuously variable valve duration device configured to adjust an intake duration of the intake valve and an exhaust duration of the exhaust valve,
the method comprising:
setting, by a controller, an ignition timing of an ignition switch of the engine to an optimum ignition timing based on a target exhaust temperature of exhaust gas when the engine is started;
setting, by the controller, the intake duration of the intake valve to an intake duration within a predetermined intake duration range; and
increasing, by the controller, the exhaust duration of the exhaust valve to an optimum exhaust duration based on the target exhaust temperature and the set intake duration.

8. The method of claim 7 , further comprising:
determining, by the controller, whether a temperature of the exhaust gas reaches a first set temperature;
setting, by the controller, the ignition timing of an ignition switch to an ignition timing within a predetermined ignition timing range when the temperature of the exhaust gas reaches at the first set temperature;
setting, by the controller, the intake duration of the intake valve to an intake duration within the predetermined intake duration range; and
increasing, by the controller, the exhaust duration to a limit exhaust duration according to the set intake duration.

9. The method of claim 8 , further comprising:
determining, by the controller, a location of a gear shift lever and an operation of an accelerator pedal;
when the gear shift lever is in a drive (D) range or a reverse (R) range, or the accelerator pedal is depressed,
setting, by the controller, the ignition timing of the ignition switch to an ignition timing within the predetermined ignition timing range;
setting, by the controller, the intake duration of the intake valve to an intake duration within the predetermined intake duration range; and
increasing, by the controller, the exhaust duration of the exhaust valve to the optimum exhaust duration based on the target exhaust temperature and the set intake duration.

10. The method of claim 9 , further comprising:
when the gear shift lever is not detected in the D range or the R range, and the accelerator pedal is not depressed,
determining, by the controller, whether the temperature of the exhaust gas is equal to or higher than a second set temperature;
when the temperature of the exhaust gas is equal to or higher than the second set temperature,
setting, by the controller, the ignition timing of the ignition switch to an ignition timing within the predetermined ignition timing range;
setting, by the controller, the intake duration of the intake valve to an intake duration within the predetermined intake duration range; and
increasing, by the controller, the exhaust duration of the exhaust valve to the optimum exhaust duration based on the set target exhaust temperature and the set intake duration.

11. A system of controlling an engine, wherein the engine includes a combustion chamber, an intake valve selectively supplying air or a mixture of air and fuel to the combustion chamber, an ignition switch arranged in the combustion chamber, an exhaust valve selectively discharging exhaust gas, and a dual continuously variable valve duration device to adjust an intake duration of the intake valve and an exhaust duration of the exhaust valve, the system comprising:
a controller configured to adjust an ignition timing of the ignition switch, the intake duration, and the exhaust duration based on a driving condition of the vehicle, and
wherein until a temperature of the exhaust gas reaches at a predetermined temperature after the engine starts,
the controller is configured to:
set the ignition timing of the ignition switch to an ignition timing within a predetermined ignition timing range,
set the intake duration of the intake valve to an intake duration within a predetermined

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Choung Jin Woo
• Kwon Kiyoung

Classifications

• F01L13/0015 Primary

  for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque · CPC title

• F02D2200/602

  Pedal position · CPC title

• F02D41/0225

  in relation with the gear ratio or shift lever position · CPC title

• F01N3/101

  Three-way catalysts · CPC title

• F01N2900/1404

  Exhaust gas temperature · CPC title