Fuel injection means for an internal combustion engine of an automobile

• US 4,491,114 A
• Filed: 05/28/1982
• Issued: 01/01/1985
• Est. Priority Date: 04/02/1979
• Status: Expired due to Term

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Asano, Masaharu
• Primary Examiner(s): Lall, Parshotam S.
• Application Number:
  US06/383,276
• Time in Patent Office: 949 Days
• Field of Search: 123/487, 123/490, 123/492, 123/493
• US Class Current: 123/492
• CPC Class Codes: F02D 41/105 using asynchronous injection
• CPC Class Codes: F02D 41/2403 using essentially up/down counters
• CPC Class Codes: F02D 41/32 of the low pressure type F02D41/3082 takes precedence
• CPC Class Codes: F02D 41/345 Controlling injection timing F02D41/365 takes precedence
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A fuel injection means for an internal combustion engine of an automobile is disclosed which comprises a pulse length determination circuit which receives a driving condition signal and develops a signal of a pulse length corresponding to the driving condition, a fuel injection starting signal generator circuit which develops a fuel injection starting signal and a driving signal generator circuit which develops a driving signal of a pulse length corresponding to that of the signal from the pulse length determination circuit. The driving signal thus developed is sent to a fuel injection valve, thereby fuel of a reliably controlled quantity is injected with a reliably controlled timing not only during usual driving condition but also during acceleration.

Claims

1. A fuel injection control system for an internal combustion engine having a fuel injection valve responsive to a fuel injection drive signal, an engine revolution sensor, and an acceleration detector for detecting an acceleration demand, said control system comprising:

an arithmetic circuit responsive to an engine operating condition indicative signal for producing a fuel injection signal having a pulse width representative of the engine operating condition signal;

a drive signal generator responsive to said fuel injection signal for producing said fuel injection drive signal, said drive signal having a pulse width proportional to the pulse width of said fuel injection signal;

a timing signal generator for controlling and activating said drive signal generator, said timing signal generator being responsive to said engine revolution sensor to generate timing signals for activating said drive signal generator periodically and in synchronism with the revolution of the engine, said timing signal generator comprising means, responsive to a detected acceleration demand, for transiently generating an acceleration demanded timing signal for effecting a fuel injection in response to said acceleration demand, said means for transiently generating said acceleration demanded timing signal being operable to count a number of crank reference angle signals generated by said engine revolution sensor after a preceding injection drive signal, and

when the number of said crank reference angle signal counted is less than a predetermined value, to generate, in response to an acceleration demand, said acceleration demanded timing signal in response to a crank reference angle signal generated immediately subsequent to said acceleration demand and to generate subsequent timing signals in response to a predetermined count of crank reference angle signals, and

when the crank reference angle signal count is equal to or more than said predetermined value, to generate said timing signals in response to said predetermined count of crank reference angle signals.

2. A system as claimed in claim 1, wherein said fuel injection drive signal has a predetermined pulse width in response to said acceleration demand.

3. A system as claimed in claim 1, wherein said fuel injection drive signal is generated in synchronism with engine revolution in response to said detected acceleration demand in order to temporarily increase the frequency of fuel injection to increase the amount of the fuel injected in the engine upon said acceleration demand.

4. A system as claimed in claim 1, wherein said drive signal pulse width remains unchanged regardless of the presence of said detected acceleration demand.

5. A system as claimed in claim 1, wherein the acceleration demanded timing signal is produced in response to said detected acceleration demand and in synchronism with said timing signals.

6. A system as claimed in claim 5, wherein the acceleration demanded timing signal is produced immediately after the acceleration demand is detected.

7. A system as claimed in claim 1, wherein the drive signal generator is operable to generate a drive signal having a predetermined pulse width in response to said detected acceleration demand.

8. A system as claimed in claim 1, wherein said fuel injection drive signal has the same pulse width regardless of whether an acceleration demand is detected.

9. The system as set forth in claim 1, wherein said timing control generator is operable to output said acceleration demanded fuel injection timing signal in response to a detected acceleration demand immediately subsequent to said detected acceleration demand and with a pulse width corresponding to that of an immediately preceding fuel injection control signal.

10. The system as set forth in claim 1, wherein said timing control generator is operable to output said acceleration demanded fuel injection timing signal in response to a detected acceleration demand immediately subsequent to said detected acceleration demand wherein said timing signal has a predetermined fixed pulse width.

11. The system as set forth in claim 1, wherein said timing control generator is operable, subsequent to outputting said acceleration demanded timing signal, to return to a normal mode wherein said fuel injection timing signals are generated whenever said crank reference angle signal count equals said predetermined value.

12. The system as set forth in claim 11, wherein said acceleration demand is detected from one of an increasing engine load and change of engine speed.

13. The system as set forth in claim 12, wherein said acceleration demand is detected from a throttle valve angular position.

14. The system as set forth in claim 13, wherein said acceleration demand is produced when said throttle valve open angle increases at a rate beyond a predetermined rate.

15. The system as set forth in claim 11, wherein said acceleration demand is detected from an air flow rate in an air induction system based on said air flow rate increasing at a rate beyond a predetermined rate.

16. The system as set forth in claim 11, wherein said acceleration demand is detected from the fuel injection signal pulse width and is based on said pulse width increasing at a rate beyond a predetermined rate.

17. A fuel injection control system for an internal combustion engine having a fuel injection valve responsive to a fuel injection drive signal, an engine revolution sensor, and an acceleration detector for detecting an acceleration demand, said control system comprising:

an arithmetic circuit responsive to an engine operating condition indicative signal for producing a fuel injection signal having a pulse width representative of the engine operating condition;

a drive signal generator responsive to said fuel injection signal for producing said fuel injection drive signal, said drive signal having a pulse width proportional to the pulse width of said fuel injection signal;

a timing signal generator for controlling and activating said drive signal generator, said timing signal generator being responsive to said engine revolution sensor to generate timing signals for activating said drive signal generator periodically and in synchronism with the revolution of the engine, said timing signal generator including means, responsive to a detected acceleration demand, for transiently generating an acceleration demanded timing signal for effecting fuel injection in response to said acceleration demand, said means for transiently generating said acceleration demanded timing signal being operable to count a number of crank reference angle signals generated after a preceding injection drive signal; and

when the number of said crank reference angle signal counted is less than a predetermined value, to generate, in response to an acceleration demand, said acceleration demanded timing signal in response to a crank reference angle signal occurring immediately subsequent to said acceleration demand and to generate subsequent timing signals in response to a predetermined count of crank reference angle signals, and

when the crank reference angle signal count is equal to or more than said predetermined value, to generate said timing signals in response to said acceleration demand indicative signal and in response to a crank reference angle signals occurring immediately subsequent to said acceleration demand, and thereafter, in response to said predetermined count of crank reference angle signals.

18. A system as claimed in claim 17, wherein said fuel injection drive signal is generated in synchronism with engine revolution in response to said detected acceleration demand in order to temporarily increase the frequency of fuel injection to increase the amount of the fuel injected in the engine upon said acceleration demand.

19. A system as claimed in claim 17, wherein the drive signal generator is operable to generate a fuel injection drive signal having a predetermined pulse width in response to said detected acceleration demand.

20. A system as claimed in claim 17, wherein said drive signal pulse width remains unchanged regardless of the presence of said detected acceleration demand.

21. A system as claimed in claim 17, wherein a pulse of said fuel injection drive signal has a predetermined pulse width in response to said acceleration demand.

22. A system as claimed in claim 17, wherein a pulse of said fuel injection drive signal has the same pulse width regardless of whether the acceleration demand is present.