Method for controlling of valve timing of continuous variable valve duration engine

Patent metadata

Field	Value
Publication number	US-10443514-B2
Application number	US-201615258043-A
Country	US
Kind code	B2
Filing date	Sep 7, 2016
Priority date	Dec 11, 2015
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

The method for controlling valve timing for a turbo engine includes: classifying control regions depending on an engine speed and an engine load; applying a maximum duration to an intake valve and applying a long duration to an exhaust valve in a first control region; applying the maximum duration to the intake and applying the long duration to the exhaust valve in a second control region; applying the long duration to the exhaust valve and advancing an intake valve closing (IVC) timing in the third control region; applying a short duration to the exhaust valve and controlling the IVC timing in the fourth control region; controlling a wide open throttle valve (WOT) and applying the short duration to the exhaust valve in the fifth control region; controlling a WOT and controlling the IVC timing by applying the long duration to the exhaust valve in the sixth control region.

First claim

What is claimed is:

1. A method for controlling valve timing of a turbo engine provided with a continuous variable valve duration (CVVD) device and a continuous variable valve timing (CVVT) device disposed on an intake valve side, and provided with a two-stage variable valve duration (VVD) device and a continuous variable valve timing (CVVT) device disposed on an exhaust valve side, the method comprising:
classifying, by a controller, a plurality of control regions depending on an engine speed and an engine load,
wherein the plurality of control regions comprises:
a first control region determined by the controller when the engine load is less than a first predetermined load,
a second control region determined by the controller when the engine load is greater than or equal to the first predetermined load and less than a second predetermined load,
a third control region determined by the controller when the engine load is greater than or equal to the second predetermined load and less than a third predetermined load,
a fourth control region when the engine load is greater than or equal to the second predetermined load and the engine speed is greater than or equal to a first predetermined speed and less than a second predetermined speed,
a fifth control region when the engine load is greater than or equal to the third predetermined load and the engine speed is less than the first predetermined speed, and
a sixth control region when the engine load is greater than or equal to the third predetermined load and the engine speed is greater than or equal to the second predetermined speed;

applying, by the controller, a maximum duration to an intake valve and applying a first duration to an exhaust valve to control a valve overlap between the exhaust valve and the intake valve in the first control region;
applying, by the controller, the maximum duration to the intake valve and applying the first duration to the exhaust valve so as to control a control overlap according to an engine load in the second control region;
applying, by the controller, the first duration to the exhaust valve and advancing an intake valve closing (IVC) timing in the third control region;
applying, by the controller, a second duration to the exhaust valve and controlling the intake valve closing (IVC) timing close to a bottom dead center in the fourth control region, wherein the second duration is set to be shorter than the first duration;
controlling, by the controller, a wide open throttle valve (WOT) and applying the second duration to the exhaust valve to generate scavenging in the fifth control region; and
controlling, by the controller, a wide open throttle valve (WOT) and controlling the intake valve closing (IVC) timing by applying the first duration to the exhaust valve so as to reduce a knocking in the sixth control region.

2. The method of claim 1 , wherein, when the first control region is determined, the controller controls an intake valve opening (IVO) timing, the intake valve closing (IVC) timing, and an exhaust valve opening (EVO) to be fixed and an exhaust valve closing (EVC) timing to be set up at a maximum value within sustainable combustion stability.

3. The method of claim 1 , wherein, when the second control region is determined, the controller controls an exhaust valve closing (EVC) timing to be retard as the engine load is increased so as to increase the valve overlap, and after when the engine load is greater than or equal to a predetermined reference load, the controller controls the exhaust valve closing (EVC) timing to be advanced to decrease the valve overlap.

4. The method of claim 1 , wherein, when the third control region is determined, the controller advances the intake valve closing (IVC) timing close to a bottom dead center when the engine speed is less than a predetermined reference speed, the controller advances the intake valve closing (IVC) timing to after the bottom dead center when the engine speed is greater than or equal to the predetermined reference speed.

5. The method of claim 1 , wherein, when the fourth control region is determined, the controller controls an intake valve opening (IVO) timing and an exhaust valve closing (EVC) to approach at a top dead center so as to reduce the valve overlap.

6. The method of claim 1 , wherein, when the fifth control region is determined, the controller advances an intake valve opening (IVO) timing to before a top dead center to generate the scavenging and controls the intake valve closing (IVC) timing to after the bottom dead center.

7. The method of claim 1 , wherein, when the fifth control region is determined, the controller retards an exhaust valve opening (EVO) timing to after a bottom dead center so as to reduce interference of exhaust and controls an exhaust valve closing (EVC) timing to after a top dead center to maintain a catalyst temperature.

8. The method of claim 1 , wherein, when the sixth control region is determined, the controller advances an exhaust valve opening (EVO) timing to before a bottom dead center to inhibit an exhaust pumping and to lower boost pressure, and the controller controls an exhaust valve closing (EVC) timing to be close to a top dead center.

9. A system for controlling valve timing of a continuous variable valve duration engine provided with a turbo charger, the system comprising:
a data detector configured to detect data related to a running state of a vehicle;
a camshaft position sensor configured to detect a position of a camshaft;
an intake continuous variable valve duration (CVVD) device configured to control an opening time of an intake valve of the engine;
an exhaust two-stage variable valve duration (VVD) device configured to control an opening time of an exhaust valve of the engine;
an intake continuous variable valve timing (CVVT) device configured to control an opening and closing timing of the intake valve of the engine;
an exhaust continuous variable valve timing (CVVT) device configured to control an opening and closing timing of the exhaust valve of the engine; and
a controller configured to classify a plurality of control regions depending on an engine speed and an engine load based on signals from the data detector and camshaft position sensor, and configured to control the intake CVVD and CVVT devices, and the exhaust two-stage VVD and CVVT devices according to the plurality of control regions,
wherein the plurality of control regions comprises:
a first control region determined by the controller when the engine load is less than a first predetermined load,
a second control region determined by the controller when the engine load is greater than or equal to the first predetermined load and less than a second predetermined load,
a third control region determined by the controller when the engine load is greater than or equal to the second predetermined load and less than a third predetermined load,
a fourth region determined by the controller when the engine load is greater than or equal to the second predetermined load and the engine speed is greater than or equal to a first predetermined speed and less than a second predetermined speed,
a fifth region determined by the controller when the engine load is greater than or equal to the third predetermined load and the engine speed is less than the first predetermined speed, and
a sixth region when the engine load is greater than or equal to the third predetermined load and the engine speed is greater than or equal to the second predetermined speed, and

wherein the controller applies a maximum duration to the intake valve and applies a first duration to the exhaust valve to limit a valve overlap in the first control region, applies the maximum duration to the i

Assignees

• Hyundai Motor Co Ltd

Inventors

• Ryu In Sang
• Ha Kyoung Pyo
• Son You Sang
• Kwon Kiyoung

Classifications

• F02D2200/101

  Engine speed · CPC title

• F01L1/053

  overhead type · CPC title

• F02D13/0215 Primary

  changing the valve timing only · CPC title

• B60W10/06

  including control of combustion engines · CPC title

• F02D2041/002

  by simultaneous control of throttle and variable valve actuation · CPC title