Method for determining and compensating engine blow-through air

Patent metadata

Field	Value
Publication number	US-9399962-B2
Application number	US-201113293015-A
Country	US
Kind code	B2
Filing date	Nov 9, 2011
Priority date	Nov 9, 2011
Publication date	Jul 26, 2016
Grant date	Jul 26, 2016

Abstract

A method for determining cylinder blow-through air via engine volumetric efficiency is disclosed. In one example, the method provides a way to adjust cylinder blow-through to promote and control a reaction in an exhaust after treatment device. The approach may simplify cylinder blow-through calculations and improve engine emissions via providing improved control of constituents reaching an exhaust after treatment device.

First claim

The invention claimed is:

1. A method of compensating engine cylinder blow-through via a controller, comprising:
sensing via a sensor;
receiving an output of the sensor in to the controller;
estimating a difference between a total cylinder air mass flow curve and a maximum volumetric efficiency curve via the controller; and
adjusting an engine actuator operatively connected to the controller and controlling supply of a combustion constituent to a cylinder in response to the estimated difference.

2. The method of claim 1 , where the total cylinder air mass flow curve characterizes mass flow through the cylinder where air mass charge of the cylinder is greater than at a point where the maximum volumetric efficiency curve and a non-blow-through volumetric efficiency curve intersect.

3. The method of claim 1 , where the engine actuator is a fuel injector, and where the maximum volumetric efficiency curve has a slope based on an effective pushback ratio.

4. The method of claim 1 , where the engine actuator is a turbocharger vane.

5. The method of claim 1 , where the engine actuator is an air inlet throttle.

6. The method of claim 1 , where a difference between a total cylinder air mass regression curve and the maximum volumetric efficiency curve represents an amount of blow-through of the cylinder.

7. The method of claim 1 , where the constituent for combustion is air or fuel.

8. A method of compensating engine cylinder blow-through via a controller, comprising:
sensing via a sensor;
receiving an output of the sensor in to the controller;
estimating a difference between a total cylinder air mass regression curve and a volumetric efficiency curve related to engine volumetric efficiency via the controller; and
adjusting an amount of cylinder air blow-through in response to the estimated difference, to provide a desired exhaust gas constituent mixture to an exhaust after treatment device, via an actuator operatively coupled to the controller.

9. The method of claim 8 , where the amount of blow-through is adjusted via adjusting a turbocharger, and where the total cylinder air mass regression curve has a slope based on an effective pushback ratio.

10. The method of claim 8 , where the amount of cylinder air blow-through is adjusted via adjusting manifold absolute pressure (MAP), via at least one of opening or closing a throttle and adjusting variable valve timing.

11. The method of claim 8 , further comprising increasing an amount of fuel injected to the engine as cylinder blow-through is increased.

12. The method of claim 11 , where the exhaust after treatment device is a particulate filter, and where the engine is a spark ignited engine.

13. A engine operating system, comprising:
an engine;
a turbocharger coupled to the engine;
an exhaust system coupled to the turbocharger;
an actuator;
an exhaust gas after treatment device positioned along a length of the exhaust system; and
a controller, operatively connected to the actuator, including instructions stored in non-transitory memory and executable by a processor of the controller, the controller configured to:
adjust the actuator to control supply of a constituent for combustion to a cylinder of the engine in response to a difference between a total cylinder air mass flow curve and a volumetric efficiency curve, and
adjust cylinder air charge in response to a lower cylinder air charge amount based on determining the volumetric efficiency curve or a non-blow-through volumetric efficiency curve.

14. The engine operating system of claim 13 where the volumetric efficiency curve is a maximum cylinder air charge curve.

15. The engine operating system of claim 14 , further comprising additional instructions to determine an intersection of the volumetric efficiency curve and the non-blow-through volumetric efficiency curve.

16. The engine operating system of claim 15 , where the total cylinder air mass flow curve begins at the intersection and extends to higher cylinder air flows.

17. The engine operating system of claim 13 , where the difference between the total cylinder air mass flow curve and the volumetric efficiency curve represents an amount of cylinder blow-through.

18. The engine operating system of claim 17 , further comprising additional instructions to adjust the amount of cylinder blow-through during regeneration of the exhaust after treatment device.

Assignees

• Hagner Dave G
• Jankovic Mrdjan J
• Chen De-Shiou
• Karnik Amey Y
• Ford Global Tech Llc

Inventors

• Hagner Dave G
• Jankovic Mrdjan J
• Chen De-Shiou
• Karnik Amey Y

Classifications

• F02D2041/001

  for engines with variable valve actuation · CPC title

• F02D13/0261

  Controlling the valve overlap · CPC title

• F02D41/182

  for the control of a fuel injection device · CPC title

• F02B2075/125

  Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber · CPC title

• F02B37/16

  by bypassing charging air · CPC title