Method for detecting cylinder air amount introduced into cylinder of internal combustion engine with exhaust gas recirculation system and for controlling fuel injection

• US 5,205,260 A
• Filed: 04/08/1992
• Issued: 04/27/1993
• Est. Priority Date: 04/10/1991
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Takahashi, Shinsuke, Shioya, Makoto, Sekozawa, Teruji
• Primary Examiner(s): WOLFE JR, WILLIS RAY
• Application Number:
  US07/865,338
• Time in Patent Office: 384 Days
• Field of Search: 123/478, 123/480, 123/486, 123/492, 123/494, 123/571, 73/118.2, 364/510
• US Class Current: 123/494
• CPC Class Codes: F02B 2075/027 four
• CPC Class Codes: F02D 2041/0017 by simultaneous control of throttle and exhaust gas recirculation
• CPC Class Codes: F02D 2041/1431 the system including an input-output delay
• CPC Class Codes: F02D 2200/0402 the parameter being determined by using a model of the engine intake or its components
• CPC Class Codes: F02D 2200/0408 Estimation of intake manifold pressure
• CPC Class Codes: F02D 41/0072 Estimating, calculating or determining the EGR rate, amount or flow sensors in EGR systems F02M26/45
• CPC Class Codes: F02D 41/008 Controlling each cylinder individually
• CPC Class Codes: F02D 41/047 Taking into account fuel evaporation or wall wetting; special correction after fuel cut-off F02D41/126
• CPC Class Codes: F02D 41/1401 characterised by the control or regulation method F02D41/1473, F02D41/1477 take precedence
• CPC Class Codes: F02D 41/18 by measuring intake air flow
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A method for controlling an internal combustion engine employing an exhaust gas recirculation system wherein a fuel injection amount is controlled corresponding to a calculated cylinder air mass flow rate and the method comprises the steps of: deriving a flow rate of a recirculated exhaust gas flowing into an induction passage of the engine; predicting a partial pressure of the exhaust gas within the induction passage on the basis of the flow rate of the recirculated exhaust gas; and deriving the cylinder air mass flow rate on the basis of the predicted value of the partial pressure of the recirculated exhaust gas. The method can also be applied to a system employing a parameter representative of fuel transfer characteristics derived by using measured values of parameters including an internal pressure in an induction passage of the engine, and the fuel injection amount is controlled depending upon the parameter representative of the fuel transfer characteristics, with the method comprising the steps of: deriving flow rates of the intake air and the recirculated exhaust gas introduced into the induction passage; predicting a total pressure in the induction passage on the basis of the intake air mass flow rate and the recirculated exhaust gas flow rae flowing in the induction passage; and deriving a parameter representative of fuel transfer characteristics in the induction passage on the basis of predetermined parameters including the total pressure.

Claims

1. In an electronic engine control system for an internal combustion engine, in which a cylinder air mass flow rate to be actually introduced into an engine cylinder is calculated using measured value of a parameter associated with engine operating condition, and a fuel injection amount is controlled corresponding to the calculated cylinder air mass flow rate, a method for calculating the cylinder air mass flow rate comprising the steps of:

deriving a mass flow rate of a recirculated exhaust gas flowing into an induction passage of the engine, said engine having an exhaust gas recirculation system;

estimating a partial pressure of the exhaust gas within said induction passage on the basis of said mass flow rate of the recirculated exhaust gas; and

deriving said cylinder air mass flow rate on the basis of the estimated value of the partial pressure of the recirculated exhaust gas.

2. In an electronic engine control system for an internal combustion engine, in which a cylinder air mass flow rate to be actually introduced into an engine cylinder is calculated using measured value of a parameter associated with engine operating condition, and a fuel injection amount is controlled corresponding to the calculated cylinder air mass flow rate, a method for calculating the cylinder air mass flow rate comprising the steps of:

deriving a mass flow rate of a recirculated exhaust gas flowing into an induction passage of the engine, said engine having an exhaust gas recirculation system;

estimating an amount of the recirculated exhaust gas mass flow rate introduced into the engine cylinder on the basis of said mass flow rate of the recirculated exhaust gas; and

deriving said cylinder air mass flow rate on the basis of the estimated value of the recirculated exhaust gas mass flow rate introduced into the engine cylinder.

3. In an electronic engine control system for an internal combustion engine, in which a cylinder air mass flow rate to be actually introduced into an engine cylinder is calculated using measured value of a parameter associated with engine operating condition, and a fuel injection amount is controlled corresponding to the calculated cylinder air mass flow rate, a method for calculating the cylinder air mass flow rate comprising the steps of:

deriving a mass flow rate of a recirculated exhaust gas flowing into an induction passage of the engine, said engine having an exhaust gas recirculation system;

estimating a partial pressure ratio of an intake air and said recirculated exhaust gas in said induction passage on the basis of an intake air mass flow rate and the recirculated exhaust gas mass flow rate flowing into said induction passage; and

deriving the cylinder air mass flow rate on the basis of predetermined parameters including said partial pressure ratio.

4. In an electronic engine control system for an internal combustion engine employing an exhaust gas recirculation system, in which a fuel injection amount is controlled corresponding to measured value of a parameter associated with engine operating condition, a method for calculating the cylinder air mass flow rate comprising the steps of:

deriving mass flow rates of an intake air and a recirculated exhaust gas introduced into an induction passage;

estimating a partial pressure of the intake air in the induction passage on the basis of the intake air mass flow rate flowing into the induction passage of the engine;

estimating a partial pressure of the recirculated exhaust gas in the induction passage on the basis of said mass flow rate of recirculated exhaust gas flowing into the induction passage of the engine; and

deriving the cylinder air mass flow rate on the basis of the estimated value of the partial pressure of the intake air and the estimated value of the partial pressure of the recirculated exhaust gas.

5. In an electronic engine control system for an internal combustion engine employing an exhaust gas recirculation system, in which a fuel injection amount is controlled corresponding to measured value of a parameter associated with engine operating condition, a method for calculating the cylinder air mass flow rate comprising the steps of:

deriving mass flow rates of an intake air and a recirculated exhaust gas introduced into an induction passage;

estimating a partial pressure of the intake air in the induction passage on the basis of the intake air mass flow rate flowing into the induction passage of the engine;

estimating a partial pressure of the recirculated exhaust gas in the induction passage on the basis of said recirculated exhaust gas mass flow rate;

estimating a total pressure of a gas in the induction passage and a partial pressure ratio of the intake air and the exhaust gas on the basis of the estimated value of the partial pressure of the intake air and the estimated value of the partial pressure of the exhaust gas; and

deriving the cylinder air mass flow rate on the basis of said total pressure and said partial pressure ratio.

6. In an electronic engine control system for an internal combustion engine employing an exhaust gas recirculation system, in which a fuel injection amount is controlled corresponding to measured value of a parameter associated with engine operating condition, a method for calculating the cylinder air mass flow rate comprising the steps of:

deriving mass flow rate of a recirculated exhaust gas introduced into an induction passage;

estimating a partial pressure of the recirculated exhaust gas in the induction passage on the basis of said recirculated exhaust gas mass flow rate;

estimating a partial pressure of an intake air on the basis of a measured value of the internal pressure in said induction passage and said partial pressure of the recirculated exhaust gas; and

deriving the cylinder air mass flow rate on the basis of the estimated value of the partial pressure of the intake air and the estimated value of the partial pressure of the recirculated exhaust gas.

7. In an electronic engine control system for an internal combustion engine employing an exhaust gas recirculation system, in which a fuel injection amount is controlled corresponding to measured value of a parameter associated with engine operating condition, a method for calculating the cylinder air mass flow rate comprising the steps of:

deriving mass flow rate of a recirculated exhaust gas introduced into an induction passage;

estimating a partial pressure of the recirculated exhaust gas in the induction passage on the basis of said recirculated exhaust gas mass flow rate;

estimating a partial pressure of an intake air the basis of a measured value of the internal pressure in said induction passage and said partial pressure of the recirculated exhaust gas;

estimating a pressure ratio of the intake air and the recirculated exhaust gas on the basis of the estimated partial pressure of the intake air and the recirculated exhaust gas; and

deriving the cylinder air mass flow rate on the basis of the pressure in said induction passage and the partial pressure ratio.

8. In an electronic engine control system for an internal combustion engine, in which a parameter representative of a fuel transfer characteristics is derived using measured values of parameters of the engine, and a fuel injection amount is controlled depending upon the parameter representative of the fuel transfer characteristics, a method for controlling a fuel injection amount comprising the steps of:

deriving mass flow rates of an intake air and a recirculated exhaust gas introduced into the induction passage;

estimating a total pressure in the induction passage on the basis of the intake air mass flow rate and the recirculated exhaust gas mass flow rate flowing in said induction passage; and

deriving a parameter representative of a fuel transfer characteristics in said induction passage on the basis of predetermined parameters including said total pressure.

9. In an electronic engine control system for an internal combustion engine, in which a parameter representative of a fuel transfer characteristics is derived using measured values of parameters of the engine, and a fuel injection amount is controlled depending upon the parameter representative of the fuel transfer characteristics, a method for controlling a fuel injection amount comprising the steps of:

deriving mass flow rates of an intake air and a recirculated exhaust gas introduced into the induction passage of the engine having an exhaust gas recirculation system;

estimating a total mass flow rate of a gas flowing into the cylinder on the basis of the intake air mass flow rate and the recirculated exhaust gas mass flow rate flowing into said induction passage; and

deriving a parameter representative of a fuel transfer characteristics in said induction passage on the basis of predetermined parameters including said total mass flow rate.

10. In an electronic engine control system for an internal combustion engine, in which a parameter representative of a fuel transfer characteristics is derived using measured values of parameters of the engine, and a fuel injection amount is controlled depending upon the parameter representative of the fuel transfer characteristics, a method for controlling a fuel injection amount comprising the steps of:

deriving a mass flow rate of a recirculated exhaust gas flowing into the induction passage of the engine, said engine having an exhaust gas recirculation system;

estimating a partial pressure of the recirculated exhaust gas in said induction passage on the basis of the mass flow rate of the recirculated exhaust gas flowing into the induction passage; and

deriving a parameter representative of the fuel transfer characteristics in said induction passage on the basis of predetermined parameters including said estimated partial pressure.

11. In an electronic engine control system for an internal combustion engine, in which a parameter representative of a fuel transfer characteristics is derived using measured values of parameters of the engine, and a fuel injection amount is controlled depending upon the parameter representative of the fuel transfer characteristics, a method for controlling a fuel injection amount comprising the steps of:

deriving a mass flow rate of a recirculated exhaust gas flowing into the induction passage of the engine, said engine having an exhaust gas recirculation system;

estimating an mass flow rate of the recirculated exhaust gas introduced into the engine cylinder on the basis of the mass flow rate of the recirculated exhaust gas flowing into the induction passage; and

deriving a parameter representative of the fuel transfer characteristics in said induction passage on the basis of predetermined parameters including said estimated recirculated exhaust gas mass flow rate introduced into the engine cylinder.

12. In an electronic engine control system for an internal combustion engine employing an exhaust gas recirculation system, in which a fuel injection amount is controlled corresponding to measured value of a parameter associated with engine operating condition, a method for calculating a cylinder air mass flow rate comprising the steps of:

estimating a partial pressure of the intake air in the induction passage on the basis of a measured intake air mass flow rate;

estimating a partial pressure of the recirculated exhaust gas flowing into the induction passage on the basis of a detected value of the internal pressure of said induction passage and said estimated partial pressure of the intake air; and

calculating said cylinder air mass flow rate on the basis of the estimated value of the partial pressure of the intake air and the estimated value of the partial pressure of the recirculated exhaust gas.

13. In an electronic engine control system for an internal combustion engine employing an exhaust gas recirculation system, in which a fuel injection amount is controlled corresponding to measured value of a parameter associated with engine operating condition, a method for calculating a cylinder air mass flow rate comprising the steps of:

detecting intake air mass flow rate and pressure in an induction passage of the engine;

estimating a partial pressure of the intake air in the induction passage on the basis of an intake air mass flow rate;

estimating a partial pressure of the recirculated exhaust gas flowing in the induction passage on the basis of a detected value of the internal pressure of said induction passage and said estimated partial pressure of the intake air; and

deriving a partial pressure ratio on the basis of the estimated value of the partial pressure of the intake air and the estimated value of the partial pressure of the recirculated exhaust gas

calculating said cylinder air mass flow rate on the basis of the measured internal pressure in said induction passage and said partial pressure ratio.

14. In an electronic engine control system for an internal combustion engine, in which a cylinder air mass flow rate to be actually introduced into an engine cylinder is calculated using measured value of a parameter associated with engine operating condition, and a fuel injection amount is controlled corresponding to the calculated cylinder air mass flow rate, a method for calculating a cylinder air mass flow rate comprising the steps of:

detecting intake air mass flow rate and pressure in an induction passage of the engine, said engine having an exhaust gas recirculation system;

estimating a partial pressure of a recirculated exhaust gas in the induction passage on the basis of an intake air mass flow rate and a detected value of the internal pressure in the induction passage; and

deriving said cylinder air mass flow rate on the basis of predetermined parameters including said estimated partial pressure.

15. In an electronic engine control system for an internal combustion engine, in which a cylinder air mass flow rate to be actually introduced into an engine cylinder is calculated using measured value of a parameter associated with engine operating condition, and a fuel injection amount is controlled corresponding to the calculated cylinder air mass flow rate, a method for calculating a cylinder air mass flow rate comprising the steps of:

detecting intake air mass flow rate and pressure in an induction passage of the engine, said engine having an exhaust gas recirculation system;

estimating a mass flow rate of a recirculated exhaust gas into the cylinder on the basis of an intake air flow mass rate and a detected value of the internal pressure in the induction passage; and

deriving said cylinder air mass flow rate on the basis of predetermined parameters including said estimated predicted recirculated exhaust gas mass flow rate.

16. In an electronic engine control system for an internal combustion engine, in which a cylinder air mass flow rate to be actually introduced into an engine cylinder is calculated using measured value of a parameter associated with engine operating condition, and a fuel injection amount is controlled corresponding to the calculated cylinder air mass flow rate, a method for calculating a cylinder air mass flow rate comprising the steps of:

detecting intake air mass flow rate and pressure in an induction passage of the engine, said engine having an exhaust gas recirculation system;

estimating a partial pressure ratio of an intake air and a recirculated exhaust gas in the induction passage on the basis of an intake air mass flow rate and a detected value of the internal pressure in the induction passage; and

deriving said cylinder air mass flow rate on the basis of predetermined parameters including said estimated partial pressure ratio.

17. In an electronic engine control system for an internal combustion engine, in which a parameter representative of a fuel transfer characteristics is derived using measured values of parameters of the engine, and a fuel injection amount is controlled depending upon the parameter representative of the fuel transfer characteristics, a method for controlling a fuel injection amount comprising the steps of:

detecting an internal pressure in an induction passage;

deriving a mass flow rate of a recirculated exhaust gas into the induction passage of the engine, said engine having exhaust gas recirculation system;

deriving a total mass flow rate of a gas flowing into the engine cylinder on the basis of a detected internal pressure in the induction passage and the recirculated exhaust gas mass flow rate introduced into the induction passage; and

deriving a parameter representative of said fuel transfer characteristics on the basis of predetermined parameters including the calculated total mass flow rate flowing into the engine cylinder.

18. In an electronic engine control system for an internal combustion engine, in which a parameter representative of a fuel transfer characteristics is derived using measured values of parameters associated with engine operating condition, and a fuel injection amount is controlled depending upon the parameter representative of the fuel transfer characteristics, a method for controlling a fuel injection amount comprising the steps of:

detecting intake air mass flow rate and pressure in an induction passage of the engine, said engine having an exhaust gas recirculation system;

deriving a total mass flow rate of a gas flowing into the engine cylinder on the basis of a detected internal pressure in the induction passage and an intake air mass flow rate; and

deriving a parameter representative of said fuel transfer characteristics on the basis of predetermined parameters including the calculated total mass flow rate flowing into the engine cylinder.

19. In an electronic engine control system for an internal combustion engine, in which a parameter representative of a fuel transfer characteristics is derived using measured values of parameters including an internal pressure in an induction passage of the engine, and a fuel injection amount is controlled depending upon the parameter representative of the fuel transfer characteristics, a method for controlling a fuel injection amount comprising the steps of:

detecting intake air mass flow rate and pressure in an induction passage of the engine, said engine having an exhaust gas recirculation system;

estimating a partial pressure of a recirculated exhaust gas in the induction passage on the basis of a detected internal pressure in the induction passage and an intake air mass flow rate; and

deriving a parameter representative of said fuel transfer characteristics on the basis of predetermined parameters including the estimated partial pressure.

20. In an electronic engine control system for an internal combustion engine, in which a parameter representative of a fuel transfer characteristics is derived using measured values of parameters associated with engine running condition engine, and a fuel injection amount is controlled depending upon the parameter representative of the fuel transfer characteristics, a method for controlling a fuel injection amount comprising the steps of:

detecting intake air mass flow and pressure in an induction passage of the engine, said engine having an exhaust gas recirculation system;

deriving a mass flow rate of a recirculated exhaust gas introduced into the engine cylinder on the basis of a detected internal pressure in the induction passage and an intake air mass flow rate; and

deriving a parameter representative of said fuel transfer characteristics on the basis of predetermined parameters including the calculated recirculated exhaust gas flow rate.