Control method for turbocharger

Patent metadata

Field	Value
Publication number	US-10408124-B2
Application number	US-201414527060-A
Country	US
Kind code	B2
Filing date	Oct 29, 2014
Priority date	Dec 3, 2013
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

A control method for a turbocharger system may include controlling opening levels of an intake bypass valve, an exhaust bypass valve, and a throttle valve according to a driving condition of a vehicle by a controller, and executing a series of commands by the controller, including determining whether an engine rpm satisfies a set low/medium speed condition, determining whether an acceleration request condition is satisfied when the engine rpm satisfies the set low/medium speed condition, closing the intake bypass valve, and controlling an opening angle of the exhaust bypass valve according to the acceleration request condition.

First claim

What is claimed is:

1. A control method for a turbocharger system including an engine and a controller, the method comprising:
executing a series of commands by the controller including:
determining whether a detected revolutions per minutes (rpm) of the engine of the turbocharger system satisfies a set low/medium speed condition of the engine;
determining whether an acceleration request condition of the engine is satisfied after the controller determines that the set low/medium speed condition is satisfied;
selectively closing the intake bypass valve; and
controlling an opening angle of the exhaust bypass valve according to the acceleration request condition after the controller determines that the set low/medium speed condition is satisfied,

wherein the turbocharger system further includes:
an intake manifold fluidically-connected to a first side of the engine;
an exhaust manifold fluidically-connected to a second side of the engine;
a first intake line supplying outdoor air to the intake manifold of the engine, wherein the intake bypass valve is mounted on the first intake line;
a turbocharger including a turbine and a compressor;
a second intake line supplying outdoor air to the compressor;
a third intake line connecting the compressor and the first intake line;
the throttle valve controlling, according to the controller, a flow of air supplied from the first intake line and the third intake line;
the intake bypass valve controlling, according to the controller, a flow of air that flows in the first intake line;
a first exhaust line connected to the exhaust manifold by bypassing the turbocharger and exhausting an exhaust gas of the exhaust manifold;
a second exhaust line channeling a portion of the exhaust gas discharged from the exhaust manifold to the first exhaust line through the turbine; and
the exhaust bypass valve mounted on the first exhaust line and controlling, according to the controller, a flow of the exhaust gas discharged from the first exhaust line,
wherein after the controller determines that the set low/medium speed condition is not satisfied, the controller controls both of the exhaust bypass valve and the intake bypass valve in a manner so that the exhaust bypass valve and the intake bypass valve, respectively, are not closed, and
wherein the set low/medium speed condition is satisfied when a current detected rpm of the engine is smaller than a predetermined maximum turbocharger operated engine rpm.

2. The method of claim 1 , wherein the determining whether the acceleration request condition is satisfied, is performed by the controller based on a vehicle operating condition including a request air volume, a request torque, or a request boost pressure.

3. The method of claim 2 , wherein:
if the request air volume is selected,
the request air volume is an air volume requested by the engine, which is calculated from a detected accelerator opening angle, and
when the request air volume is larger than an actual air volume supplied to the engine, the acceleration request condition is satisfied.

4. The method of claim 2 , wherein:
if the request torque is selected,
the request torque is request torque calculated from a detected accelerator opening angle, and
when the request torque is larger than a set maximum natural intake engine torque of engine, the acceleration request condition is satisfied.

5. The method of claim 2 , wherein:
if the request boost pressure is selected,
the request boost pressure is request boost pressure calculated from a detected accelerator opening angle, and
when the request boost pressure is larger than a set maximum natural intake boost pressure of the engine, the acceleration request condition is satisfied.

6. The method of claim 1 , wherein the opening angle of the exhaust bypass valve is determined based on a vehicle operating condition including a request air volume, a request torque, and a request boost pressure.

7. The method of claim 1 , wherein:
after the controlling of the opening angle of the exhaust bypass valve according to the acceleration request condition, the controller determines whether a current request torque is smaller than an engine torque and when the current request torque is smaller than the engine torque, the controller opens the exhaust bypass valve and the intake bypass valve.

8. The method of claim 7 , wherein the controller determines whether the current request torque is smaller than the engine torque within a set time which is delayed after controlling the opening angle of the exhaust bypass valve.

9. The method of claim 1 , further comprising:
before starting the engine, determining whether an ignition key sensor is on by the controller receiving a signal from the ignition key sensor;
before starting the engine, opening the intake bypass valve and the exhaust bypass valve fully when the ignition key sensor is not on;
before starting the engine, verifying positions of the intake and exhaust bypass valves by fully closing the intake and exhaust bypass valves and fully opening the intake and exhaust bypass valves thereafter, when the ignition key sensor is on; and
starting the engine.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Kim Yoon Joo
• Han Seung Kook
• Hwang Il Joong
• Chu Dong Ho
• Park Jong Il
• Han Dong Hee
• Im Hyuk
• Lim Hyun Jun

Classifications

• F02D41/10

  for acceleration · CPC title

• F02B37/18 Primary

  by bypassing exhaust {from the inlet to the outlet of turbine or to the atmosphere} · CPC title

• F02D2200/101

  Engine speed · CPC title

• F02D2250/16

  End position calibration, i.e. calculation or measurement of actuator end positions, e.g. for throttle or its driving actuator · CPC title

• F02D2250/18

  Control of the engine output torque · CPC title