Method of adaptively controlling individual cylinder fuel injection quantities in electronically controlled diesel engine and device therefor

• US 4,590,907 A
• Filed: 02/22/1985
• Issued: 05/27/1986
• Est. Priority Date: 03/02/1984
• Status: Expired due to Fees

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Matsuno, Kiyotaka, Tsukamoto, Keisuke, Nagase, Masaomi
• Primary Examiner(s): GREENLIEF, MAGDALEN Y
• Application Number:
  US06/704,417
• Time in Patent Office: 459 Days
• Field of Search: 123/357, 123/358, 123/359, 123/419, 123/503
• US Class Current: 123/357
• CPC Class Codes: F02B 1/04 with fuel-air mixture admission into cylinder
• CPC Class Codes: F02B 3/06 with compression ignition compression ignition engines using air or gas for blowing fuel into compressed air in cylinder F02B13/02
• CPC Class Codes: F02D 2200/0406 Intake manifold pressure
• CPC Class Codes: F02D 2200/0606 Fuel temperature
• CPC Class Codes: F02D 41/0085 Balancing of cylinder outputs, e.g. speed, torque or air-fuel ratio
• CPC Class Codes: F02D 41/1498 measuring engine roughness
• CPC Class Codes: F02D 41/408 of the distributing type
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

In effecting individual cylinder fuel injection control in an electronically controlled diesel engine, wherein rpm variations with every explosion cylinder are detected and compared with one another, the increase or decrease in the fuel injection quantity with every cylinder is learned until rpm variations of the respective cylinders become uniform, and a fuel injection quantity control actuator is controlled with every cylinder, so that engine vibrations due to a dispersion in fuel injection quantity between the cylinders can be controlled, an adaptive correction quantity is determined in accordance with an rpm variation deviation obtained from a difference between a mean rpm variation and rpm variations of the respective cylinders, and the engine temperature or the fuel temperature, and the fuel injection quantity control actuator is controlled with every cylinder in accordance with the adaptive correction quantity, to thereby prevent the divergence of the correction quantity.

Claims

1. A method of adaptively controlling individual cylinder fuel injection quantities in an electronically controlled diesel engine, wherein rpm variations of every explosion cylinder are detected from engine speeds and compared with a mean value of the rpm variations of all the cylinders, a correction quantity to be increased or decreased is learned in accordance with an rpm variation deviation or every cylinder until the rpm variations of the cylinders become uniform, and a spill actuator is adjusted for every cylinder, so that engine vibrations due to a dispersion in fuel injection quantity between the cylinders can be reduced, characterized in that said method comprises the steps of:

detecting engine temperature or fuel temperature;

determining an rpm variation deviation from a difference between a mean rpm variation of all the cylinders and the rpm variations of the respective cylinders;

determining an everytime correction quantity in accordance with said rpm variation deviation and said engine temperature or said fuel temperature; and

determining an individual cylinder correction quantity by integrating said everytime correction quantities of every cylinder.

2. A method of adaptively controlling as set forth in claim 1, wherein said engine temperature is regarded as a coolant temperature.

3. A method of adaptively controlling as set forth in claim 1, wherein said fuel temperature is regarded as a fuel temperature in a fuel injection pump.

4. A method of adaptively controlling as set forth in claim 1, wherein said everytime correction quantity is reduced to a small value as said rpm variation deviation becomes smaller, when said engine temperature or said fuel temperature is lower than normal temperature.

5. A method of adaptively controlling as set forth in claim 1, wherein said everytime correction quantity is reduced to a small value as said rpm variation deviation becomes smaller, and a non-sensitive zone to said rpm variation deviation is expanded, when said engine temperature or said fuel temperature is lower than normal temperature.

6. A device for adaptively controlling individual cylinder fuel injection quantities in an electronically controlled diesel engine, wherein said device comprises:

a fuel injection pump including a spill ring and a spill actuator, for controlling fuel injection quantities;

injection nozzles for injecting fuel discharged from a fuel injection pump into combustion chambers;

an accelerator sensor for detecting an accelerator opening;

an engine rotation sensor for detecting an engine speed;

a temperature sensor for detecting engine temperature or fuel temperature; and

a control unit for determining a target injection quantity at least from said accelerator opening and said engine speed, controlling said spill actuator so that fuel of target injection quantity can be discharged from said fuel injection pump, determining an everytime correction quantity in accordance with an rpm variation deviation, obtained from a difference between a mean rpm variation of all the cylinders and the rpm variations of the respective cylinders, and said engine temperature or said fuel temperature so as to eliminate a dispersion in the rpm variation, determining an individual cylinder correction quantity by interating said everytime correction quantities of every cylinder, and controlling said spill actuator for every cylinder in accordance with said individual cylinder correction quantity.

7. A method of adaptively controlling individual cylinder fuel injection quantities in an electronically controlled diesel engine, wherein rpm variations of every explosion cylinder are detected from engine speeds and compared with a mean value of the rpm variations of all the cylinders, a correction quantity to be increased or decreased is learned in accordance with an rpm variation deviation of every cylinder until the rpm variations of the cylinders become uniform, and a spill actuator is controlled with every cylinder, so that engine vibrations due to a dispersion in fuel injection quantity between the cylinders can be reduced, characterized in that said method comprises the steps of:

detecting engine temperature or fuel temperature;

determining the rpm variation deviation from a difference between a mean rpm variation and the rpm variations of the respective cylinders;

determining an rpm variation deviation for the control in accordance with said rpm variation deviation and said engine temperature or said fuel temperature;

determining an everytime correction quantity in accordance with said rpm variation deviation for the control; and

determining an individual cylinder correction quantity by integrating said everytime correction quantities of every cylinder.