FUEL INJECTION SYNCHRONIZING SYSTEM

• US 3,612,009 A
• Filed: 08/19/1969
• Issued: 10/12/1971
• Est. Priority Date: 08/28/1968
• Status: Expired due to Term

• Current Assignee: Iseji Kamazuka, Kunio Endo
• Original Assignee: Iseji Kamazuka, Kunio Endo
• Inventors: Endo, Kunio, Kamazuka, Iseji
• Primary Examiner(s): Goodridge, Laurence M.
• Application Number:
  US04/851,318
• Time in Patent Office: 784 Days
• Field of Search: 123/32,32E,119
• US Class Current: 123/490
• CPC Class Codes: F02D 41/365 with means for controlling timing and distribution

Abstract

In a fuel injection control apparatus for use with a multicylinder fuel injection-type engine, which gives each fuel injection nozzle-operating solenoid valve an exciting pulse of a duration to satisfy the engine requirement, a fuel injection synchronizing system by which a pulse signal synchronous with the cycle of the engine is produced and the exciting pulse is distributed to each cylinder.

Claims

1. A synchronized fuel injection system for producing and distributing fuel injection exciting pulses which are synchronous with the operation of the cylinders of an internal combustion engine and which have a time duration that is automatically varied by a DC parameter signal representing at least one engineoperating parameter, said system comprising:

first and second switching means, each such means corresponding to a particular cylinder of said engine, means for sequentially and repetitively operating said switching means in synchronism with the operation of said engine, an adding circuit means for providing a composite sum output of uniform pulses, each representing the actuation of either one of said switching means, sawtooth generator means electrically connected to said adding circuit means for producing a sawtooth shaped waveform synchronous with said composite sum output, comparing means electrically connected to said sawtooth generator means for comparing said sawtooth waveform with said DC parameter signal and for providing a timed output pulse in synchronism with said sawtooth waveform and having a time duration that is a predetermined function of said DC parameter signal, bistable distributor means for providing first and second outputs corresponding to the actuation of said first and second switching means respectively, first drive means electrically connected to said comparing means and to said distributor means for providing a first fuel injection valve exciting pulse when both said timed output pulse and said first output are present thereby providing a timed fuel injection signal for the cylinder corresponding to said first switching means, and second drive means electrically connected to said comparing means and to said distributor means for providing a second fuel injection valve exciting pulse when both said timed output pulse and said second output are present thereby providing a timed fuel injection signal for the cylinder corresponding to said second switching means.

2. A fuel injection synchronizing system as defined in claim 1, in which said opening and closing elements include a cam rotated synchronously with the rotation of the engine and breaker points provided each for every cylinder above the path of rotation of said cam and opened and closed by said cam.

3. A synchronized fuel injection system as in claim 1 further comprising:

first and second pulse shaping means electrically connected to said first and second switching means respectively for providing uniformly shaped pulses in response to actuation of the respectively associated switching means.

4. A synchronized fuel injection system wherein:

one set of elements as reciTed in claim 1 comprise a first functional line of control apparatus for controlling fuel injection in first and third cylinders, and another like set of elements comprise a second functional line of control apparatus for controlling fuel injection in second and fourth cylinders, whereby, when the first, second, third and fourth cylinders are sequentially fired in that order, proper overall fuel injection control is maintained even though time overlaps occur at higher engine r.p.m. since only alternately fired cylinders are controlled by a single functional line of control apparatus.

5. A synchronized fuel injection system as in claim 4 further comprising:

pulse-shaping means electrically connected to each switching means for providing uniformly shaped pulses in response to the actuation of its associated switching means.

6. A synchronized fuel injection system as in claim 1 wherein:

said means for sequentially and repetitively operating comprises a permanent magnet mounted for rotation synchronously with the rotation of said engine, and each of said switching means comprise sealed magnetic contacts corresponding to one engine cylinder and mounted adjacent the path of revolution of said permanent magnet whereby said switching means are sequentially and repetitively operated in synchronism with the rotation of said engine.