Method and apparatus for controlling operation of an internal combustion engine

Patent metadata

Field	Value
Publication number	US-10208684-B2
Application number	US-201515557613-A
Country	US
Kind code	B2
Filing date	Mar 13, 2015
Priority date	Mar 13, 2015
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

An internal combustion engine includes a method for operating including, determining, using an accelerator pedal position sensor, an operator request for power and determining an engine operating point based upon the operator request for power. A motored-cylinder temperature is determined based upon the engine operating point, and a knock-limited combustion phasing point is determined based upon the motored-cylinder temperature and the engine operating point. Engine operating parameters associated with achieving the knock-limited combustion phasing point are selected. Operation includes controlling, by a controller, engine control states in response to the engine operating parameters associated with achieving the knock-limited combustion phasing point and the operator request for power.

First claim

The invention claimed is:

1. A method for operating an internal combustion engine, the method comprising:
determining, using an accelerator pedal position sensor, an operator request for power;
determining an engine operating point based upon the operator request for power;
determining a motored-cylinder temperature based upon the engine operating point;
determining a knock-limited combustion phasing point based upon the motored-cylinder temperature and the engine operating point;
selecting engine operating parameters associated with achieving the knock-limited combustion phasing point; and
controlling, by a controller, engine control states in response to the engine operating parameters associated with achieving the knock-limited combustion phasing point and the operator request for power.

2. The method of claim 1 , wherein determining a motored-cylinder temperature based upon the engine operating point comprises determining an in-cylinder compression temperature at a predetermined engine crank angle immediately prior to combustion ignition.

3. The method of claim 1 , wherein determining a knock-limited combustion phasing point based upon the motored-cylinder temperature and the engine operating point comprises determining a knock-limited 50% mass-burn-fraction point that correlates to the motored-cylinder temperature at the engine operating point.

4. The method of claim 1 , wherein determining a knock-limited combustion phasing point based upon the motored-cylinder temperature and the engine operating point comprises selecting a combustion phasing point that achieves a preferred engine operating point responsive to the operator request for power and does not exceed an engine knock limit.

5. The method of claim 4 , wherein selecting a combustion phasing point that achieves a preferred engine operating point responsive to the operator request for power and does not exceed an engine knock limit comprises selecting a combustion phasing point that achieves a minimum specific fuel consumption point responsive to the operator request for power that does not exceed the engine knock limit.

6. The method of claim 1 , wherein controlling, by a controller, engine control states in response to the engine operating parameters associated with achieving the knock-limited combustion phasing point and the operator request for power comprises executing a feedback control scheme to control the engine control states in response to the engine operating parameters associated with achieving the knock-limited combustion phasing point and a desired combustion phasing point.

7. The method of claim 6 , wherein executing the feedback control scheme to control the engine control states in response to the engine operating parameters associated with achieving the knock-limited combustion phasing point and the desired combustion phasing point further comprises controlling the engine control states based upon signal feedback from an air/fuel ratio sensor and a knock sensor.

8. The method of claim 1 , wherein controlling, by a controller, engine control states in response to the engine operating parameters associated with achieving the knock-limited combustion phasing point and the operator request for power comprises executing a feed-forward control scheme to control the engine control states in response to the engine operating parameters associated with achieving the knock-limited combustion phasing point.

9. The method of claim 1 , further comprising evaluating deterioration in engine performance based upon the knock-limited combustion phasing point, the motored-cylinder temperature and the engine operating point.

10. A method for operating an internal combustion engine, the method comprising:
determining a motored-cylinder temperature based upon an engine operating point in response to an operator request for power;
determining a knock-limited combustion phasing point based upon the motored-cylinder temperature;
selecting engine operating parameters associated with achieving the knock-limited combustion phasing point;
controlling, by a controller, engine control states to achieve the engine operating parameters associated with achieving the knock-limited combustion phasing point for the engine operating point that is in response to the operator request for power; and
evaluating, by a controller, deterioration in engine performance based upon the knock-limited combustion phasing point, the motored-cylinder temperature and the engine operating point.

11. The method of claim 10 , wherein determining a motored-cylinder temperature based upon the engine operating point comprises determining an in-cylinder compression temperature at a predetermined engine crank angle immediately prior to combustion ignition.

12. The method of claim 10 , wherein determining a knock-limited combustion phasing point based upon the motored-cylinder temperature and the engine operating point comprises determining a knock-limited 50% mass-burn-fraction point that correlates to the motored-cylinder temperature at the engine operating point.

13. The method of claim 10 , wherein determining a knock-limited combustion phasing point based upon the motored-cylinder temperature and the engine operating point comprises selecting a combustion phasing point that achieves a preferred engine operating point responsive to the operator request for power and does not exceed an engine knock limit.

14. The method of claim 13 , wherein selecting a combustion phasing point that achieves a preferred engine operating point responsive to the operator request for power and does not exceed an engine knock limit comprises selecting a combustion phasing point that achieves a minimum specific fuel consumption point responsive to the operator request for power that does not exceed the engine knock limit.

15. The method of claim 10 , wherein controlling, by a controller, engine control states in response to the engine operating parameters associated with achieving the knock-limited combustion phasing point and the operator request for power comprises executing a feedback control scheme to control the engine control states in response to the engine operating parameters associated with achieving the knock-limited combustion phasing point and a desired combustion phasing point.

16. The method of claim 15 , wherein executing the feedback control scheme to control the engine control states in response to the engine operating parameters associated with achieving the knock-limited combustion phasing point and the desired combustion phasing point further comprises controlling the engine control states based upon signal feedback from an air/fuel ratio sensor and a knock sensor.

17. The method of claim 10 , wherein controlling, by a controller, engine control states in response to the engine operating parameters associated with achieving the knock-limited combustion phasing point and the operator request for power comprises executing a feed-forward control scheme to control the engine control states in response to the engine operating parameters associated with achieving the knock-limited combustion phasing point.

18. An internal combustion engine, comprising:
a multi-cylinder four-stroke internal combustion engine having reciprocating pistons slidably movable in cylinders that define variable volume combustion chambers, a plurality of actuators and a plurality of sensors;
a controller including executable routines, the routines including:
determining a motored-cylinder temperature based upon an engine operating point in response to an operator request f

Assignees

• Gm Global Tech Operations Llc

Inventors

• He Yongsheng
• Liu Jim
• Sun David
• Shibata Jonathan T

Classifications

• F02D2200/602

  Pedal position · CPC title

• F02D35/026

  using an estimation · CPC title

• F02D2200/022

  Estimation of engine temperature · CPC title

• F02D11/105

  characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque · CPC title

• F02D35/028 Primary

  by determining the combustion timing or phasing · CPC title