Device and method for decreasing delays in fuel injected internal combustion engines

• US 5,137,000 A
• Filed: 03/29/1991
• Issued: 08/11/1992
• Est. Priority Date: 03/29/1991
• Status: Expired due to Term

• Current Assignee: Cummins Engine Company Incorporated (Cummins Incorporated)
• Original Assignee: Cummins Electronics, Co.
• Inventors: Johnson, Edwin A., Stepper, Mark R.
• Primary Examiner(s): WOLFE JR, WILLIS RAY
• Application Number:
  US07/677,786
• Time in Patent Office: 501 Days
• Field of Search: 123/478, 123/480, 123/486, 123/492, 123/493, 364/431.05
• US Class Current: 123/478
• CPC Class Codes: F02D 41/008 Controlling each cylinder individually
• CPC Class Codes: F02D 41/263 the program execution being modifiable by physical parameters
• CPC Class Codes: F02D 41/34 with means for controlling injection timing or duration
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

An engine control device for electronically controlling fuel injection of an engine is disclosed. The engine control device includes algorithms for instantaneously calculating fueling requirements in accordance with sensory inputs corresponding to engine operating conditions and throttle position. The fueling requirements are instantaneously reflected as modifications of the duration of fueling signals supplied to the fuel injectors, so that instantaneous fueling changes are effected. Fuel is conserved, and engine responsiveness improved in the current or presently occurring fuel injection cycle as a result of the immediate responsiveness of the engine control device operation.

Claims

1. A fuel injection controller for use with a fuel injected multi-cylinder internal combustion engine, said fuel injection controller comprising:

throttle means for producing a throttle signal corresponding to a desired engine power output level;

means for sensing engine position and producing a position signal corresponding with engine camshaft rotational position;

means for sensing engine coolant temperature and producing a temperature signal in response thereto;

means for sensing air pressure of the intake manifold of the engine and producing a pressrue signal in response thereto;

means for supplying fuel to the cylinders of the engine;

said means for supplying including a plurality of fuel signal inputs each corresponding to a cylinder of the engine, said means for supplying responding to signals supplied to said fuel signal inputs and metering fuel to corresponding cylinders of the engine;

circuit means responsive to said throttle signal, said temperature signal, and pressure signal and said engine position signal and producing a fueling signal for each power stroke of each cylinder of the engine, said fueling signals supplied to corresponding one fo said fuel signal inputs;

wherein said circuit means is a microcomputer including RAM, ROM, analog to digital converter means and digital I/O, and wherein said microcomputer calculates a duration time interval corresponding to said fueling signals in accordance with said temperature signal, said pressure signal, and said throttle signal and wherein said microcomputer repeatedly calculates said duration time before the expiration of each of said fueling signals so that the duration of each of said fueling signals is altered immediately in accordance with changes in said temperature signal, said pressure signal, and said throttle signal when neccessary.

2. A device for controlling fuel injection in connection with a mulit-cylinder internal combustion engine, said device comprising:

temperature sensor means for producing a temperature signal corresponding to coolant temperature of the engine;

pressure sensor means for producing a pressure signal corresponding to intake manifold air pressure of the engine;

accelerator sensor means for producing a power signal corresponding to power output desired from the engine in response to actuation of said accelerator sensor means by an operator of the engine;

means for sensing engine position and producing a position signal corresponding to engine camshaft rotational position;

means for sensing engine speed and producing a speed signal in accordance therewith;

a plurality of fuel injectors corresponding one for one with the cylinders of the engine, wherein each of said fuel injectors includes a fueling input and wherein said fuel injectors supply fuel to the corresponding cylinders of the engine in accordance with the duration of signals supplied to said fueling inputs;

a microcomputer including analog to digital converter means for inputting analog signals, digital I/O, ROM and RAM, said microcomputer being responsive to said power signal, said position signal, said temperature signal, said pressure signal and said speed signal, said microcomputer producing a plurality of fueling signals and supplying one of said plurality of fueling signals to a corresponding one of said fueling inputs of said plurality of fuel injectors prior to each power stroke of the corresponding cylinder of the engine, said microcomputer responding to changes in said power signal, said temperature signal, said pressure signal and said speed signal to shorten or lengthen the duration of each of said plurality of fueling signals accordingly before the expiration of each of said plurality of fueling signals;

wherein said microcomputer includes a fuel map in ROM for determining the appropriate duration for each of said plurality of fueling signals in response to said power signal, said temperature signal, said pressure signal, and said speed signal.

3. The device of claim 2 wherein said engine is a Diesel engine.

4. A fuel injection controller for use with a fuel injected multi-cylinder internal combustion engine, said fuel metering device comprising:

throttle means for producing a throttle signal corresponding to a desired engine power output level;

means for supplying fuel to the cylinders of the engine, said means for supplying including a plurality of fuel signal inputs each corresponding to a cylinder of the engine, said means for supplying responding to signals supplied to said fuel signal inputs and metering fuel to corresponding cylinders of the engine;

circuit means responsive to said throttle signal and producing a fueling signal for each power stroke of each cylinder of the engine, said fueling signals supplied to corresponding ones of said fuel inputs; and

wherein the duration of each of said fueling signals is altered immediately in accordance with changes in said throttle signal.

5. The fuel injection controller of claim 4 wherein said means for supplying fuel are electro-mechanical fuel injectors and said circuit means is a microcomputer including RAM, ROM, analog I/O and digital I/O.

6. The device of claim 4 including:

means for sensing engine position and producing a position signal corresponding with engine camshaft rotational position;

means for sensing engine coolant temperature and producing a temperature signal in response thereto;

means for sensing air pressure of the intake manifold of the engine and producing a pressure signal in response thereto; and

wherein said circuit means is responsive to said temperature signal, said pressure signal, said engine position signal, and said throttle signal in producing said fueling signals.

7. A method of controlling the supply of fuel to an internal combustion engine comprising the steps of:

(1) receiving a fueling request;

(2) determining a fueling requirement based upon said fueling request;

(3) producing a fueling signal for each power stroke of the engine in accordance with said fueling requirement;

(4) continuously repeating steps (1) and (2) and altering the duration of said fueling signal before the expiration thereof.

8. The method of claim 7 including the steps of:

providing a means for sensing coolant temperature;

providing a means for sensing engine camshaft position;

providing a means for sensing air pressure within the intake manifold of the engine; and

wherein steps (2) includes determining a fueling requirement based upon said sensed coolant temperature, said sense camshaft position, said sensed air pressure and said fueling request.

9. The method of claim 8 wherein said fueling request is produced by an accelerator sensor.

10. The method of claim 9 wherein the engine is a multi-cylinder engine and a fueling signal is produced for each cylinder of the engine.

11. A device for controlling fuel injection in connection with a multi-cylinder internal combustion engine, said device comprising:

accelerator sensor means for producing a power signal corresponding to power output desired from the engine in response to actuation of said accelerator sensor means by an operator of the engine;

means for sensing engine position and producing a position signal corresponding to engine camshaft rotational position;

a plurality of fuel injectors corresponding one for one with the cylinders of the engine, wherein each of said fuel injectors includes a fueling input and wherein said fuel injectors supply fuel to the corresponding cylinders of the engine in accordance with the duration of signals supplied to said fueling inputs;

controller means responsive to said power signal and said position signal for supplying signals to each of said fueling inputs of said plurality of fuel injectors, said controller means producing a plurality of fueling signals and supplying one of said plurality of fueling signals to a corresponding one of said plurality of fuel injectors prior to each power stroke of the corresponding cylinder of the engine, said controller means responding to changes in said power signal to shorten or lengthen the duration of each of said plurality of fueling signals accordingly before the expiration of each of said plurality of fueling signals.

12. The device of claim 11 wherein said controller means is a microcomputer including analog to digital converter means, digital I/O, ROM, and RAM.

13. The device of claim 12 including:

temperature sensor means for producing a temperature signal corresponding to coolant temperature of the engine;

pressure sensor means for producing a pressure signal corresponding to intake manifold air pressure of the engine; and

wherein said microcomputer means is responsive to said temperature signal and said pressure signal in addition to said power signal in producing said plurality of fueling signals.

14. The device of claim 11 including:

temperature sensor means for producing a temperature signal corresponding to coolant temperature of the engine;

pressure sensor means for producing a pressure signal corresponding to intake manifold air pressure of the engine; and

wherein said controller means is responsive to said temperature signal and said pressure signal in addition to said power signal in producing said plurality of fueling signals.

15. The device of claim 14 wherein said controller means is a microcomputer including analog to digital converter means for inputting analog signals, digital I/O, ROM and RAM.

16. The device of claim 15 including means for sensing engine speed and producing a speed signal in accordance therewith and wherein said controller means is also responsive to said speed signal in producing said plurality of fueling signals.