Operation control system for internal combustion engines at and after starting

• US 4,987,871 A
• Filed: 02/03/1989
• Issued: 01/29/1991
• Est. Priority Date: 02/07/1988
• Status: Expired due to Term

• Current Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Original Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Inventors: Nishikawa, Takafumi
• Primary Examiner(s): Dolinar, Andrew M.
• Application Number:
  US07/306,825
• Time in Patent Office: 725 Days
• Field of Search: 123/362, 123/179 A, 123/179 G, 123/179 L, 123/588, 123/491
• US Class Current: 123/362
• CPC Class Codes: F02D 41/061 the corrections being time dependent

Abstract

An operation control system for internal combustion engines at and after starting has an engine temperature sensor, a control valve for controlling the amount of intake air to be supplied to the engine, and a valve opening determining device responsive to an output from the engine temperature sensor for determining the opening of the control valve. The valve opening determining device sets the opening of the control valve at the start of the engine to a value such that the intake air amount is smaller as the engine temperature is lower. A fuel amount determining device is responsive to the output from the engine temperature sensor for determining the amount of fuel to be supplied to the engine at starting. A correction value determining device is responsive to the opening of a throttle valve of the engine for determining a correction value for the fuel amount in such a manner as to increase the fuel amount at a larger rate as the throttle opening is larger. A valve opening progressive increase device progressively increases the opening of the control valve after the start of the engine. A valve opening progressive decrease device progressively decreases the opening of same after the engine rotational speed reaches a predetermined value after the start of the engine.

Claims

1. In a system for controlling the operation of an internal combustion engine having an intake passage, including temperature sensor means for sensing a temperature of said engine, control valve means for controlling an amount of intake air supplied into said intake passage of said engine, valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said engine, and valve actuator means responsive to an output from said valve opening determining means for controlling said control valve means,

the improvement including starting period detecting means for detecting whether or not a starting state of said engine has lasted over a predetermined period of time and intake air amount correcting means for correcting the amount of intake air to a larger value after said predetermined period of time has elapsed, said predetermined period of time being set to a shorter value as the temperature of said engine is lower,

wherein said valve opening determining means sets the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower.

2. A system for controlling the operation of an internal combustion engine having an intake passage, including temperature sensor means for sensing a temperature of said engine, control valve means for controlling an amount of intake air supplied into said intake passage of said engine, valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said engine, said valve opening determining means setting the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower,

valve actuator means responsive to an output from said valve opening determining means for controlling said control valve means,

a throttle valve arranged in said intake passage, the system including fuel amount determining means responsive to the output from said temperature sensor means for determining an amount of fuel to be supplied to said engine at the start of same, fuel supply means for supplying said engine with the amount of fuel determined by said fuel amount determining means, second valve opening sensor means for sensing the opening of said throttle valve, correction value determining means responsive to an output from said second valve opening sensor means for determining a correction value for the amount of fuel, said correction value determining means determining said correction value so as to increase the amount of fuel at a larger rate as the opening of said throttle valve is larger, correcting means for correcting the amount of fuel based on the determined correction value,

starting period detecting means for detecting whether or not a starting state of said engine has lasted over a predetermined period of time, and intake air amount correcting means for correcting the amount of intake air to a larger value after said predetermined period of time has elapsed,

said predetermined period of time being set to a shorter value as the temperature of said engine is lower.

3. In a system for controlling the operation of an internal combustion engine having an intake passage, including temperature sensor means for sensing a temperature of said engine, control valve means for controlling an amount of intake air supplied into said intake passage of said engine, valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said engine, and valve actuator means responsive to an output from said valve opening determining means for controlling said control valve means,

the improvement wherein said valve opening determining means sets the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower, and wherein said system includes third valve opening determining means responsive to the output from said temperature sensor means for determining the opening of said control valve after the start of said control valve after the start of said engine, upper limit value setting means responsive to the output from said temperature sensor means for setting an upper limit value of the opening of said control valve after the start of said engine, and valve opening progressive increase means for progressively increasing the opening of said control valve determined by said third valve opening determining means to the set upper limit value.

5. A system as claimed in claim 3 or 4, wherein said third valve opening determining means sets the opening of said control valve to a smaller value as the temperature of said engine is lower.

6. A system as claimed in claim 3 or 4, wherein said upper limit value of the opening of said control valve is set to a larger value as the temperature of said engine is lower.

7. A system as claimed in claim 3 or 4, wherein said valve opening progressive increase means progressively increases the opening of said control valve at a smaller rate as the temperature of said engine is lower.

4. A system for controlling the operation of an internal combustion engine having an intake passage, including temperature sensor means for sensing a temperature of said engine, control valve means for controlling an amount of intake air supplied into said intake passage of said engine, valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said engine, said valve opening determining means setting the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower, valve actuator means responsive to an output from said valve opening determining means for controlling said control valve means,

a throttle valve arranged in said intake passage, the system including fuel amount determining means responsive to the output form said temperature sensor means for determining an amount of fuel to be supplied to said engine at the start of same, fuel supply means for supplying said engine with the amount of fuel determined by said fuel amount determining means, second valve opening sensor means for sensing the opening of said throttle valve, correction value determining means responsive to an output from said second valve opening sensor means for determining a correction value for the amount of fuel, said correction value determining means determining said correction value so as to increase the amount of fuel at a larger rate as the opening of said throttle valve is larger, and correcting means for correcting the amount of fuel based on the determined correction value, third valve opening determining means responsive to the output from said temperature sensor means for determining the opening of said control valve after the start of said engine, upper limit value setting means responsive to the output from said temperature sensor means for setting an upper limit value of the opening of said control valve after the start of said engine, and valve opening progressive increase means for progressively increasing the opening of said control valve determined by said third valve opening determining means to the set upper limit value.

8. In a system for controlling the operation of an internal combustion engine having an intake passage, including temperature sensor means for sensing a temperature of said engine, control valve means for controlling an amount of intake air supplied into said intake passage of said engine, valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said, engine, and valve actuator means responsive to an output from said valve opening determining means for controlling said control valve means,

the improvement wherein said valve opening determining means sets the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower, and wherein said system includes engine rotational speed setting means responsive to the output from said temperature sensor means for setting a predetermined value of the rotational speed of said engine, third valve opening determining means responsive to the output from said temperature sensor means for determining the opening of said control valve after the start of said engine, and valve opening progressive decrease means for progressively decreasing the opening of said control valve after the rotational speed of said engine reaches said predetermined value.

10. A system as claimed in claim 8 or 9, wherein said engine rotational speed setting means sets said predetermined value to a larger value as the temperature of said engine is lower.

11. A system as claimed in claim 8 or 9, wherein said third valve opening determining means sets the opening of said control valve to a smaller value as the temperature of said engine is lower.

12. A system as claimed in claim 8 or 9, wherein said valve opening progressive decrease means progressively decreases the opening of said control valve at a smaller rate as the temperature of said engine is lower.

9. A system for controlling the operation of an internal combustion engine having an intake passage, including temperature sensor means for sensing a temperature of said engine, control valve means for controlling an amount of intake air supplied into said intake passage of said engine, valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said engine,

said value opening determining means setting the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower,

valve actuator means responsible to an output from said valve opening determining means for controlling said control valve means,

a throttle valve arranged in said intake passage, the system including fuel amount determining means responsive to the output from said temperature sensor means for determining an amount of fuel to be supplied to said engine at the start of same, fuel supply means for supplying said engine with the amount of fuel determined by said fuel amount determining means, second valve opening sensor means for sensing the opening of said throttle valve, correction value determining means responsive to an output from said second valve opening sensor means for determining a correction value for the amount of fuel, said correction value determining means determining said correction value so as to increase the amount of fuel at a larger rate as the opening of said throttle valve is larger, correcting means for correcting the amount of fuel based on the determined correction value,

engine rotational speed setting means responsive to the output from said temperature sensor means for setting a predetermined value of the rotational speed of said engine, third valve opening determining means responsive to the output from said temperature sensor means for determining the opening of said control valve after the start of said engine, and valve opening progressive decrease means for progressively decreasing the opening of said control valve after the rotational speed of said engine reaches said predetermined value.

13. In a system for controlling the operation of an internal combustion engine having an intake passage, including temperature sensor means for sensing a temperature of said engine, control valve means for controlling an amount of intake air supplied into said intake passage of said engine, valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said engine, and valve actuator means responsive to an output from said valve opening determining means for controlling said control valve means,

the improvement wherein said valve opening determining means sets the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower, and wherein said system includes engine rotational speed setting means responsive to the output from said temperature sensor means for setting a predetermined value of the rotational speed of said engine, third valve opening determining means responsive to the output from said temperature sensor means for determining the opening of said control valve after the start of said engine, valve opening progressive increase means for progressively increasing the opening of said control valve determined by said third valve opening determining means, and progressive increase stop means for stopping the progressive increase of the opening of said control valve effected by said valve opening progressive increase means when the rotational speed of said engine reaches said predetermined value.

15. A system as claimed in claim 13 or 14, wherein said engine rotational speed setting means sets said predetermined value to a larger value as the temperature of said engine is lower.

16. A system as claimed in claim 13 or 14, wherein said third valve opening determining means sets the opening of said control valve to a smaller value as the temperature of said engine is lower.

17. A system as claimed in claim 13 or 14, including valve opening progressive decrease means for progressively decreasing the opening of said control valve after said progressive increase stop means stops the progressive increase of the opening of said control valve effected by said valve opening progressive increase means.

18. A system as claimed in claim 13 or 14, wherein said valve opening progressive increase means progressively increases the opening of said control valve at a smaller rate as the temperature of said engine is lower.

19. A system as claimed in claim 13 or 14, wherein said valve opening progressive decrease means progressively decreases the opening of said control valve at a smaller rate as the temperature of said engine is lower.

14. A system for controlling the operation of an internal combustion engine having an intake passage, comprising:

temperature sensor means for sensing a temperature of said engine,

control valve means for controlling an amount of intake air supplied into said intake passage of said engine,

valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said engine,

said valve opening determining means setting the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower,

valve actuator means responsive to an output from said valve opening determining means for controlling said control valve means,

a throttle valve arranged in said intake passage,

fuel amount determining means responsive to the output from said temperature sensor means for determining an amount of fuel to be supplied to said engine at the start of same,

fuel supply means for supplying said engine with the amount of fuel determined by said fuel amount determining means,

second valve opening sensor means for sensing the opening of said throttle valve,

correction value determining means responsive to an output from said second valve opening sensor means for determining a correction value for the amount of fuel, said correction value determining means determining said correction value so as to increase the amount of fuel at a larger rate as the opening of said throttle valve is larger,

correcting means for correcting the amount of fuel based on the determined correction value,

engine rotational speed setting means responsive to the output from said temperature sensor means for setting a predetermined value of the rotational speed of said engine,

third valve opening determining means responsive to the output from said temperature sensor means for determining the opening of said control valve after the start of said engine,

valve opening progressive increase means for progressively increasing the opening of said control valve determined by said third valve opening determining means, and

progressive increase stop means for stopping the progressive increase of the opening of said control valve effected by said valve opening progressive increase means when the rotational speed of said engine reaches said predetermined value.

20. In a system for controlling the operation of an internal combustion engine having an intake passage, including temperature sensor means for sensing a temperature of said engine, control valve means for controlling an amount of intake air supplied into said intake passage of said engine, valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said engine, and valve actuator means responsive to an output from said valve opening determining means for controlling said control valve means,

the improvement wherein said valve opening determining means sets the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower, and wherein said system includes third valve opening determining means responsive to the output from said temperature sensor means for determining the opening of said control valve after the start of said engine, upper limit value setting means responsive to the output from said temperature sensor means for setting an upper limit value of the opening of said control valve after the start of said engine, engine rotational speed setting means responsive to the output from said temperature sensor means for setting a predetermined value of the engine rotational speed, valve opening progressive increase means for progressively increasing the valve opening determined by said third valve opening determining means at a rate depending upon the temperature of said engine until the opening of said control valve reaches said upper limit value set by said upper limit value setting means, and valve opening progressive decrease means for progressively decreasing the opening of said control valve after the engine rotational speed reaches said predetermined value.

22. A system as claimed in claim 20 or 21, wherein said third valve opening determining means sets the opening of said control valve to a smaller value as the engine temperature is lower.

23. A system as claimed in claim 20 or 21, wherein said upper limit value of the opening of said control valve is set to a larger value as the engine temperature is lower.

24. A system as claimed in claim 20 or 21, wherein said engine rotational speed setting means sets said predetermined value to a larger value as the temperature of said engine is lower.

25. A system as claimed in claim 20 or 21, wherein said valve opening progressive increase means progressively increases the opening of said control valve at a smaller rate as the temperature of said engine is lower.

26. A system as claimed in claim 20 or 21, wherein said valve opening progressive decrease means progressively decreases the opening of said control valve at a smaller rate as the temperature of said engine is lower.

21. A system for controlling the operation of an internal combustion engine having an intake passage, comprising:

temperature sensor means for sensing a temperature of said engine,

control valve means for controlling an amount of intake air supplied into said intake passage of said engine,

valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said engine,

said valve opening determining means setting the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower,

valve actuator means responsive to an output from said valve opening determining means for controlling said control valve means,

a throttle valve arranged in said intake passage,

fuel amount determining means responsive to the output from said temperature sensor means for determining an amount of fuel to be supplied to said engine at the start of same,

fuel supply means for supplying said engine with the amount of fuel determined by said fuel amount determining means,

second valve opening sensor means for sensing the opening of said throttle valve,

correction value determining means responsive to an output from said second valve opening sensor means for determining a correction value for the amount of fuel, said correction value determining means determining said correction value so as to increase the amount of fuel at a larger rate as the opening of said throttle valve is larger,

correcting means for correcting the amount of fuel based on the determined correction value,

third valve opening determining means responsive to the output from said temperature sensor means for determining the opening of said control valve after the start of said engine,

upper limit value setting means responsive to the output from said temperature sensor means for setting an upper limit value of the opening of said control valve after the start of said engine,

engine rotational speed setting means responsive to the output from said temperature sensor means for setting a predetermined value of the engine rotational speed,

valve opening progressive increase means for progressively increasing the valve opening determined by said third valve opening determining means at a rate depending upon the temperature of said engine until the opening of said control valve reaches said upper limit value set by said upper limit value setting means, and

valve opening progressive decrease means for progressively decreasing the opening of said control valve after the engine rotational speed reaches said predetermined value.