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United States Patent (19) 11 Patent Number: 5,610,327 Becker Et Al

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United States Patent (19) 11 Patent Number: 5,610,327 Becker Et Al US005610327A United States Patent (19) 11 Patent Number: 5,610,327 Becker et al. (45) Date of Patent: Mar 11, 1997 (54) KNOCK SENSOR-TRIGGERED TIMING 4,413,508 11/1983 Kawamura et al. LIGHT WITH VISIBLE LASER 4,417,211 11/1983 Ciriacks et al. RETRO-REFLECTING CONTROL 4,423,624 1/1984 Dooley et al. 4,441,360 4/1984 Dooley et al.. 75 Inventors: Thomas P. Becker; Mark A. 4,466,407 8/1984 Aures et al. 4,517,833 5/1985 Wesley ....... ... 73/19 A Hoferitza; Matthew M. Crass, all of 4,713,617 12/1987 Michalski .................................. 73/499 Kenosha, Wis. 4,775,816 10/1988 White et al.. 73) Assignee: Snap-on Technologies, Inc., Crystal 4,890,592 1/1990 Furuyama et al. Lake, Ill. Primary Examiner-Richard Chilcot Assistant Examiner-Eric S. McCall 21 Appl. No.: 486,328 Attorney, Agent, or Firm-Emrich & Dithmar 22 Filed: Jun. 7, 1995 57) ABSTRACT (51) Int. Cl. ............................ F02P 17/00 A diesel timing light includes a flash circuit for flashing a xenon lamp in response to ignition events sensed by a knock 52 U.S. Cl. ... 73/117.3; 73/5; 324/392; sensor. A trigger circuit enables the flash circuit only in the 324/402 presence of an enable signal, which is generated by a sensing 58) Field of Search ........................... 73/5, 35.03, 35.04, circuit immediately before the ignition of the no. 1 cylinder. 73/35.06, 35.09, 117.2, 117.3, 504.01, 514,26, The sensing circuit includes a visible laser source which 514.27; 324/391,392, 401, 402 illuminates a patch of reflective tape on the engine flywheel just ahead of a timing mark corresponding to engine top 56) References Cited dead center. The tape reflects the visible laser light to a U.S. PATENT DOCUMENTS sensor which generates the enable signal. The trigger dis 3,857,086 12/1974 Mooney et al.. ables the flash circuit immediately after the flash triggered 4,079,311 3/1978 Roth. by the first ignition event after the enable signal. LED 4,106,461 8/1978 Giannini. indicators indicate when the photosensor is detecting the 4,128,005 12/1978 Arnston et al. ... 73/117.3 reflected beam and when the knock sensor is detecting 4,185,494 1/1980 Yelke ............. ... 73/119A ignition events. 4,266,427 5/1981 Wesley .................................. 73/119A 4,296,471 10/1981 Goux. 20 Claims, 3 Drawing Sheets U.S. Patent Mar. 11, 1997 Sheet 1 of 3 5,610,327 IF IIL. 1 IF II. 2 U.S. Patent Mar 11, 1997 Sheet 2 of 3 5,610,327 U.S. Patent Mar 11, 1997 Sheet 3 of 3 5,610,327 5,610,327 1. 2 KNOCK SENSOR-TRIGGERED TMING flash circuit for enabling the flash circuit only in the presence LGHT WITH VISIBLE LASER of an enable signal, and a sensing circuit adapted to be RETRO-REFLECTING CONTROL coupled to the engine for sensing that an ignition event of interest is about to occur and responsive to such sensing for BACKGROUND OF THE INVENTION generating the enable signal. Further features of the invention are attained by providing 1. Field of the Invention apparatus for controlling a timing light for use with an The present invention relates to timing lights for moni internal combustion engine which has periodic ignition toring the timing of events in internal combustion engines. events and which includes an accessible member rotatable The invention is particularly concerned with timing lights 10 through an integer number of revolutions during each engine for use with diesel engines. operating cycle and bearing a first indicium which aligns 2. Description of the Prior Art - with a fixed second indicium on the engine once during each High intensity strobe lights, called timing lights, are used revolution of the member, the apparatus comprising: an in conjunction with timing marks or indicia on the block and ignition sensor coupled to the engine for sensing ignition on an adjacent rotating part of an internal combustion engine 5 events, a first light source, a flash circuit coupled to the for timing the ignition of the no. 1 cylinder. In spark-ignited ignition sensor and to the first light source for producing a engines, the timing light is triggered by the no. 1 spark plug flash of illumination in response to an ignition event, a signal. However, in the case of diesel engines, timing is trigger circuit coupled to the flash circuit for enabling the more difficult, since there is no spark plug from which to flash circuit only in the presence of an enable signal, a obtain the ignition signal. 20 second light source adapted for directing an incident beam Timing lights for diesel engines have been triggered by of light onto the accessible member, a reflective portion on pressure sensors adapted to mate with the glow plug recep the accessible member disposed so as to be illuminated by tacle of a diesel engine cylinder to sense the pressure the incident beam of light once during each revolution of the member to produce a reflected beam of light, the reflective resulting from combustion in the cylinder. Also, trigger 25 portion being so positioned on the member that it aligns with circuits have been provided for detecting the point in time at the second indicium just prior to alignment of the first which an injector nozzle begins to open to inject fuel into the indicium with the second indicium, and a photosensing cylinder. However, in many cases, the no. 1 cylinder is not circuit coupled to the trigger circuit and disposed in the path readily accessible. of the reflected beam of light for generating the enable signal It is known to utilize a vibration sensor, such as a knock 30 sensor, to detect engine vibrations resulting from the pres in response to the reflected beam of light. sure of cylinder combustion. However, such sensors detect The invention consists of certain novel features and a the ignition events for all cylinders whereas, for purposes of combination of parts hereinafter fully described, illustrated triggering a timing light, only the no. 1 cylinder ignition in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various event is of interest. 35 changes in the details may be made without departing from the spirit, or sacrificing any of the advantages of the present SUMMARY OF THE INVENTION invention. It is a general object of the invention to provide an improved timing light for diesel engines, which avoids the BRIEF DESCRIPTION OF THE DRAWINGS disadvantages of prior timing light arrangements while 40 For the purpose of facilitating an understanding of the affording additional structural and operating advantages. invention, there is illustrated in the accompanying drawings An important feature of the invention is the provision of a preferred embodiment thereof, from an inspection of a diesel timing light which does not require access to the no. which, when considered in connection with the following 1 cylinder. 45 description, the invention, its construction and operation, In connection with the foregoing feature, a further feature and many of its advantages should be readily understood and of the invention is the provision of a diesel timing light of appreciated. the type set forth, which can be usefully triggered by a FIG. 1 is a perspective view of the timing light of the vibration sensor. present invention, shown coupled to a diesel engine illus In connection with the foregoing features, still another 50 trated in phantom; feature of the invention is the provision of a timing light of the type set forth, which is responsive to only vibrations FIG. 2 is an enlarged front end elevational view of the resulting from ignition events in a cylinder of interest. timing light of FIG. 1; Yet another feature of the invention is the provision of a FIG. 3 is a top plan view of the timing light of FIG. 2 and timing light control apparatus which enables the timing light 55 associated cabling shown partially in phantom, and trigger just before the occurrence of an ignition event of FIG. 4 is a schematic circuit diagram of the control circuit interest and disables it immediately after that ignition event. of the timing light of FIG. 1. In connection with the foregoing feature, a further feature of the invention is the provision of an apparatus of the type DESCRIPTION OF THE PREFERRED set forth, which utilizes alight beam reflected from a moving EMBODIMENT part of the engine to enable the timing light. Referring to FIG. 1, there is illustrated a diesel engine 10 Certain ones of these and other features of the invention having a block 11 and a drive shaft 12, to which is mounted are attained by providing in a timing light, which includes a a flywheel 13. Provided on the peripheral surface of the flash circuit for producing a flash of illumination in response 65 flywheel 13 is a timing mark 15. Provided on the block 11 to an ignition event of an internal combustion engine, the adjacent to the flywheel 13 is a series of scale marks 16 for improvement comprising: a trigger circuit coupled to the use in conjunction with the timing mark 15 for monitoring 5,610,327 3 4 engine timing, in a known manner. Typically, the engine 10 to the anode of a diode 57, the cathode of which is coupled will be mounted in a vehicle which is provided with a battery through a capacitor 58 to the other fixed terminal of the 18.
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