With Analysis Of Displayed Waveform Patents (Class 324/379)
  • Patent number: 10215112
    Abstract: A method for controlling an internal combustion engine that includes sensing a characteristic of combustion in a cylinder of the engine, generating a combustion characteristic signal from the sensed characteristic, performing a principal component analysis on the combustion characteristic signal and a predetermined combustion characteristic trace to determine first mode coefficients for the combustion characteristic signal and the predetermined combustion characteristic trace, determining a difference between the first mode coefficient of the combustion characteristic signal and the first mode coefficient of the predetermined combustion characteristic trace, and controlling the internal combustion engine based upon the difference.
    Type: Grant
    Filed: September 8, 2017
    Date of Patent: February 26, 2019
    Inventors: Jun-mo Kang, Hejie Lin, Jeffrey A. Morgan
  • Patent number: 9479220
    Abstract: Methods and systems are provided for detection and analysis of abnormalities in a power line communication network of a vehicle. The vehicle includes various vehicle modules. The power line communication network includes power lines designed to carry electric power to the vehicle modules. Each vehicle module includes a power line communication module that is communicatively coupled to at least one of the power lines. The power line communication modules enable the power lines to communicate communication information to and from the vehicle modules. The power line communication modules can communicate pilot signals over the power line communication network. One or more of the power line communication modules includes a reflectometer module configured to perform reflectometry processing on the pilot signals to determine properties of the power line communication network.
    Type: Grant
    Filed: November 24, 2014
    Date of Patent: October 25, 2016
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Timothy D. Julson, Moshe Laifenfeld, Gary W. Taraski
  • Patent number: 9349353
    Abstract: A device and corresponding operational method for storing frequency values to a memory of the device, comprising an internal memory and an external memory, are provided. A frequency value in a memory cell of the internal memory is actualized by an increment or a decrement. After a specific number of increments and decrements in the memory cells of the internal memory, a maximum frequency value of the frequency values stored in the memory cells of the internal memory is determined, and the maximum frequency value is transferred to a corresponding memory cell of the external memory. The memory cell of the internal memory that contains the transferred maximum frequency value is reset. After a period, content of each memory cell of the internal and external memory is read, and each memory cell of the internal and external memory is reset.
    Type: Grant
    Filed: November 28, 2014
    Date of Patent: May 24, 2016
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventors: Michael Reinhold, Bernhard Nitsch
  • Patent number: 9239350
    Abstract: Methods and apparatus are provided for determining an abnormal condition in an electrical system of a vehicle. The apparatus includes a memory for storing data relating to normal voltage transients. The apparatus also includes a computer electrically connectable to the electrical system and in communication with the memory. The computer is configured to sense voltage transients that occur in the electrical system of the vehicle, compare the sensed voltage transients to the stored normal voltage transients, and determine if the sensed voltage transient indicates an abnormal condition in the electrical system of the vehicle.
    Type: Grant
    Filed: February 20, 2013
    Date of Patent: January 19, 2016
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventor: Timothy D. Julson
  • Patent number: 8624577
    Abstract: In one embodiment, a system for identifying a cable path may be provided. The system may include a cable set operable to transmit data, the cable set comprising power delivery wires designed to transmit electrical power. The cable set may also comprise two adapters proximate respective ends of the cable set, the first adapter operable to be coupled to a signal generator operable to transmit electrical power across the power delivery wires. In some embodiments, the cable set may further comprise a circuit coupled to the power delivery wires of the cable set, the circuit operable to receive electrical power from the signal generator and allow at least a portion of the electrical power to continue across the power delivery wires. The cable set may further comprise an indicator coupled to the circuit and operable to emit light when electrical power from the circuit is received at the indicator.
    Type: Grant
    Filed: October 8, 2010
    Date of Patent: January 7, 2014
    Assignee: Raytheon Company
    Inventor: Charles B. Bradley, II
  • Patent number: 8248074
    Abstract: A fault detection method is provided for detecting faults in an injector arrangement. The injector arrangement includes one or more piezoelectric fuel injectors connected in an injector drive circuit, and the injector drive circuit is arranged to control operation of the one or more piezoelectric fuel injectors. The fault detection method includes determining a sample voltage at a sample point in the injector drive circuit at a first sample time. The sample voltage is the voltage on an injector or is related to the voltage on an injector. The method further includes calculating a range of predicted voltages expected at the sample point at a second sample time following the first sample time, and determining the sample voltage at the sample point at the second sample time. The presence of a fault is detected if the sample voltage determined at the sample point at the second sample time is not within the range of predicted voltages.
    Type: Grant
    Filed: October 10, 2008
    Date of Patent: August 21, 2012
    Assignee: Delphi Technologies Holding S.arl
    Inventors: Louisa J. Perryman, Daniel Jeremy Hopley
  • Publication number: 20120081123
    Abstract: The present invention is a Universal Automotive Ignition Pickup Assembly that produces an ignition secondary voltage waveform that can be monitored by an oscilloscope or microprocessor. This is accomplished with a sensing probe that can be capacitive coupled; inductively coupled; or capacitive and inductively coupled at the same time. Due to the ability of a pickup to be capacitive and inductive at the same time, the ignition voltage waveforms are clear and concise from secondary ignition wires to a multitude of different ignition coil types.
    Type: Application
    Filed: October 1, 2010
    Publication date: April 5, 2012
    Inventors: Bernie C. Thompson, Neal R. Pederson
  • Patent number: 8055077
    Abstract: A realtime display compression for a waveform image uses a priority basis for combining groups of pixels when producing a compressed waveform image in order to preserve intensity information. As an example successive lines of data for the waveform image are demultiplexed into line buffers in a circulating manner, the number of line buffers being a function of the maximum desired integer compression ratio. The outputs from the line buffers are aligned and the corresponding pixels are combined according to a desired compression ratio, one output line for each integer compression ratio. The appropriate compressed line is selected as the output line according to the desired compression ratio, with the totality of the output lines forming the compressed waveform image.
    Type: Grant
    Filed: December 2, 2005
    Date of Patent: November 8, 2011
    Assignee: Tektronix, Inc.
    Inventors: Jeff W. Mucha, Robert L. Beasley
  • Patent number: 7142974
    Abstract: Engine measuring equipment for obtaining engine torque regarded as necessary for engine performance assessments for a short time period during a period when engine revolution is under a transient state is disclosed. The engine measuring equipment includes a central control unit for controlling throttle opening degrees due to revolution of the engine and load torque of the dynamometer; a detector connected to an output shaft of the engine, for detecting measurement data including at least revolution and shaft torque of the engine driven by controlling the central control unit; and a signal processing unit for measuring engine torque based on measurement data from the detector. The signal processing unit operates so as to calculate the engine torque based on time series data of the revolution and the shaft torque detected with the detector to measure engine torque from transient state data.
    Type: Grant
    Filed: March 30, 2005
    Date of Patent: November 28, 2006
    Assignee: A&D Company, Limited
    Inventors: Mitsuharu Sugita, Keniti Kondo, Hikaru Furukawa
  • Patent number: 7136780
    Abstract: An abnormality diagnosis apparatus for determining whether abnormality relating to execution of automatic activation has occurred in a timer circuit. An electronic control unit includes a microcomputer for storing a history of execution of automatic activation of a device by a soak timer circuit. The microcomputer determines that an abnormality relating to execution of automatic activation has occurred in the soak timer circuit if an elapsed time measurement and the history stored by the microcomputer do not correspond with each other when a switch is operated to activate the device.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: November 14, 2006
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Osamu Hirashima
  • Patent number: 6873902
    Abstract: Methods and devices for measuring and calculating various kinds of parameters of a running engine are disclosed. A camera may be positioned to capture a plurality of images of a moving component that is being driven by the an engine. From the plurality of images, a velocity of the moving component may be measured, and an acceleration then derived. From the derived acceleration, various parameters of the running engine may be calculated, including but not limited to, number of firing cylinders, rotational rate, and relative cylinder balance. These and other parameters may then be reported, such as through a display screen, to a user. The methods and devices disclosed herein may also generate recommendations for specific kinds of maintenance to an engine based on the results of parameter measurements and calculations, then report those recommendations to a user.
    Type: Grant
    Filed: March 27, 2003
    Date of Patent: March 29, 2005
    Assignee: Snap-On Incorporated
    Inventor: William Welch
  • Patent number: 6861841
    Abstract: A method and apparatus is provided that can accurately display the data from an ignition event. Data from a secondary waveform of the ignition event is collected and stored. The same data can be averaged and sent to a display buffer. A portion of the previously stored data can be retrieved and replace the peak portion of the waveform that has been averaged, thereby displaying a more accurate peak data.
    Type: Grant
    Filed: November 27, 2002
    Date of Patent: March 1, 2005
    Assignee: SPX Corporation
    Inventors: Kurt Raichle, Troy Liebl
  • Patent number: 6844735
    Abstract: An inspection object constructed of an ignition plug and an ignition coil is inserted in an inspection housing that does not have a ground electrode. A voltage generated in the ignition coil is measured while the inspection object is housed in the inspection housing. Electrical discharge does not occur because the ground electrode is not provided. Therefore, the voltage generated in the ignition coil is properly measured for quality inspection of the ignition coil.
    Type: Grant
    Filed: July 29, 2003
    Date of Patent: January 18, 2005
    Assignee: Denso Corporation
    Inventors: Tetsuya Miwa, Atsuya Mizutani, Hiromi Hiramatsu
  • Patent number: 6789518
    Abstract: In a method and system, the condition of a valve drive, particularly of valve clearance, and the position of at least one valve opening cam of a cam shaft of an internal combustion engine are recorded from processing signals which are generated by at least one impact sound sensor such as an electronic spark sensor. Preferably, at least one characteristic signal sequence is identified from signals generated by the impact sound sensor. The sequence occurs at a particular time during a cycle of the internal combustion engine, and is compared to a stored reference signal. As a result, the condition of a valve drive, e.g. the valve clearance, and/or the position of at least one valve opening cam of the cam shaft can be deduced.
    Type: Grant
    Filed: November 21, 2002
    Date of Patent: September 14, 2004
    Assignee: Bayerische Motoren Werke Aktiengesellschaft
    Inventors: Georg Buhl, Markus Mueller
  • Publication number: 20040113628
    Abstract: An inspection object constructed of an ignition plug and an ignition coil is inserted in an inspection housing that does not have a ground electrode. A voltage generated in the ignition coil is measured while the inspection object is housed in the inspection housing. Electrical discharge does not occur because the ground electrode is not provided. Therefore, the voltage generated in the ignition coil is properly measured for quality inspection of the ignition coil.
    Type: Application
    Filed: July 29, 2003
    Publication date: June 17, 2004
    Inventors: Tetsuya Miwa, Atsuya Mizutani, Hiromi Hiramatsu
  • Publication number: 20040100265
    Abstract: A method and apparatus is provided that can accurately display the data from an ignition event. Data from a secondary waveform of the ignition event is collected and stored. The same data can be averaged and sent to a display buffer. A portion of the previously stored data can be retrieved and replace the peak portion of the waveform that has been averaged, thereby displaying a more accurate peak data.
    Type: Application
    Filed: November 27, 2002
    Publication date: May 27, 2004
    Inventors: Kurt Raichle, Troy Liebl
  • Patent number: 6617857
    Abstract: An engine analyzer senses and displays secondary ignition signals from a DIS engine using a two sets of test leads. The engine analyzer receives the secondary signals from both sets of leads and produces positive and negative peak values for each set of leads during each cylinder firing. Based upon the positive and negative peak values for both sets of leads, during each of the cylinder firings, the engine analyzer selects which lead set and which polarity will be used to supply the secondary voltage signal for each cylinder to be digitized and displayed.
    Type: Grant
    Filed: June 29, 2001
    Date of Patent: September 9, 2003
    Assignee: SPX Corporation
    Inventors: Martin P. Franz, Scott R. Sebastian
  • Patent number: 6531872
    Abstract: A method and an apparatus for diagnosing the Ignition-Off Timer of an internal combustion engine. This invention monitors the initial operation of the Ignition-Off Timer each time it is enabled in order to detect a variety of malfunctions. The malfunctions are detected by comparing the operation of the Ignition-Off Timer to various reference values. Upon diagnosis of the Ignition-Off Timer, its condition is reported to the diagnostic management system, which determines whether and when a malfunction indicator is energized.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: March 11, 2003
    Assignee: General Motors Corporation
    Inventors: Mark D. Carr, Daniel P. Grenn
  • Patent number: 6476611
    Abstract: A circuit for monitoring and diagnosing an oxygen probe provided with a sensitive cell connected between a first and a second signal terminal, and a heating member connected between a battery and a heating terminal; the circuit includes an interface stage and a control unit. The interface stage includes a first resistor connected between a switch which is normally open and a supply line at a known potential and the first signal terminal, a second resistor connected between the first signal terminal and a second signal terminal and a third resistor connected between the second signal terminal and reference potential line. The control unit further includes a first analog-digital converter connected to the first signal terminal and a second analog-digital converter connected to the second signal terminal.
    Type: Grant
    Filed: March 13, 2001
    Date of Patent: November 5, 2002
    Assignee: Magnetic Marelli S.p.A.
    Inventors: Marco Berti, Piero Carbonaro, Daniele Ceccarini, Luca Poggio
  • Patent number: 6426626
    Abstract: A method and apparatus for testing spark plugs and ignition coils. An apparatus includes a power supply for supplying power to an ignition coil to generate a spark across a spark plug. A capture circuit captures an energy signal reflected from the ignition coil in response to the spark. A comparator circuit compares the captured energy signal to a predetermined signal. A method includes the steps of supplying power to an ignition coil to generate a spark across a spark plug, capturing an energy signal reflected from the ignition coil in response to the spark and comparing the captured energy signal to a predetermined signal. The predetermined signal represents one of a distinct group of reflected energy signals which indicate various defects in the coil or plug. Preferably, a match between the captured energy signal and the predetermined signal is used to indicate to the user a defective coil or plug.
    Type: Grant
    Filed: March 29, 1999
    Date of Patent: July 30, 2002
    Assignee: Progressive Tool & Industries Company
    Inventor: Steven F. Kravis
  • Patent number: 6411096
    Abstract: An engine analyzer stores acquired cylinder waveform data in circular buffers respectively associated with the cylinders in accordance with cylinder selection by the user, with each buffer including a plurality of storage cells respectively storing data for individual firing cycles of the associated cylinder, and simultaneously displays the waveform for a, single selected cylinder on one trace of a display screen and waveforms for all cylinders for which data is stored on a second trace, so that data can be acquired and displayed from direct ignition engines with the use of a single pickup lead connected to selected cylinders one cylinder at a time. Various display modes are possible, including a frozen mode in which all stored waveform data may be reviewed and displayed.
    Type: Grant
    Filed: March 6, 1998
    Date of Patent: June 25, 2002
    Assignee: Snap-on Tools Company
    Inventors: Carel C. Anthoni, Tyrone J. Moritz, Yosuf M. Taraki, Dale A. Trsar, Richard H. Sheperd
  • Patent number: 6396278
    Abstract: A hand-held ignition voltage tester for detecting voltage on a spark plug wire in an ignition system, such as a distributorless ignition system. The tester includes a housing, positive and negative power cables and a capacitive probe for capacitively coupling to the spark plug wire. The capacitive probe generates a voltage signal which is representative of the voltage on the spark plug wire. A plurality of voltage level indicators are mounted to the housing to form a bar graph, with each indicator corresponding to a selected voltage level. A measurement circuit is coupled to the power cables and the capacitive probe for activating the voltage level indicators in response to the voltage signal.
    Type: Grant
    Filed: September 10, 1998
    Date of Patent: May 28, 2002
    Inventor: Surender K. Makhija
  • Patent number: 6384606
    Abstract: An ignition coil with an isolated internal lead in proximity to the secondary side can be used in a capacitive discharge ignition system with a microprocessor-based signal-processing module to monitor system performance. The diagnostic lead is fed into a diagnostic signal interface circuit that provides a logic edge to the microprocessor when the spark plug fires. By measuring the time from the firing signal provided by the microprocessor to the logic edge provided by the diagnostic signal interface circuit, the precise energy necessary to fire the plug can be determined. An ignition system that includes an ignition coil with a diagnostic lead can extend spark plug life by automatically adjusting spark energy to minimize wear on the spark plug.
    Type: Grant
    Filed: March 6, 2000
    Date of Patent: May 7, 2002
    Assignee: SN Controls LLC
    Inventor: Stephen H. Nussbaum
  • Publication number: 20010034576
    Abstract: The invention is directed to an improved portable on-board mass emissions measuring system for internal combustion engines. In the preferred embodiment, the system is comprised of an exhaust analyzer (16), at least one sensor (18, 22 or 29) which may be temporarily attached to the engine for sensing parameters of the engine, and a processor (19) programmed to collect and manipulate data from the analyzer and the sensor, whereby the mass emissions of the engine may be calculated. The system may further comprise a display (20) for displaying the mass emissions of the engine and an engine-control interface (21). The sensor may be capable of sensing engine RPM, engine oil temperature, or intake manifold pressure. The exhaust analyzer may be capable of measuring concentrations of the engine exhaust constituents, particulates, aerosols, and gases in the engine emissions.
    Type: Application
    Filed: June 13, 2001
    Publication date: October 25, 2001
    Applicant: Clean Air Technologies International, Inc.
    Inventor: Michal Vojtisek-Lom
  • Patent number: 6018245
    Abstract: A method and apparatus for detecting and displaying automotive fuel injector voltage signal pulse width which includes signal detection circuits for capturing the rising and falling edges of an input signal having positive and negative voltage swings is disclosed. Upon detecting a rising edge or a falling edge of a positive or negative voltage of the input signal, a corresponding software routine is executed to carry out the process of measuring the pulse width of a pulse of the input signal. The measured pulse width is then displayed in numerical and/or histogramic formats.
    Type: Grant
    Filed: June 15, 1998
    Date of Patent: January 25, 2000
    Assignee: Snap-On Technologies, Inc.
    Inventors: Charles N. Villa, Claes Georg Andersson
  • Patent number: 5941926
    Abstract: An engine analyzer has an oscilloscope screen display operable with a fixed-time sweep. The analyzer includes a data acquisition system for digitizing analog input waveforms and a memory for storing the digitized waveform data, the analyzer including sensors for detecting each cylinder firing and the firing of the no. 1 cylinder for identification of the cylinders. A processor includes trigger means for controlling the triggering of the oscilloscope display at a trigger point which corresponds to the firing of a trigger cylinder which is selectable by the user, so that the displayed waveform data begins with the stored data for the selected trigger cylinder. The user can also selectively vary the location of the trigger point on the screen display.
    Type: Grant
    Filed: April 10, 1996
    Date of Patent: August 24, 1999
    Assignee: Snap-on Technologies, Inc.
    Inventors: Yosuf M. Taraki, Dale A. Trsar, Richard H. Shepherd, Tyrone J. Moritz, Mark H. Petersen
  • Patent number: 5933009
    Abstract: An engine analyzing device for an internal combustion engine including a spark generator and means for testing the voltage of the sparks generated for a diagnosis of engine performance, the testing of the sparks generated relating to analysis of the spark voltage wave form from the breakdown voltage, the collapsing field voltage and the duration of the spark pulse or some combination of these.
    Type: Grant
    Filed: May 30, 1996
    Date of Patent: August 3, 1999
    Inventor: William M. Kayser
  • Patent number: 5923161
    Abstract: A measuring device displays waveforms representative of electrical signals and includes a selector, at least one input terminal, and a graphical display. The graphical display is suitable to view a waveform thereon. The measuring device receives an electrical signal from the input terminal and displays a first waveform on the graphical display representative of the electrical signal. The selector is selectable to one of a plurality of positions and the measuring device selects a set of waveform data in response to each of the positions. The measuring device displays a second waveform on the graphical display representative of the waveform data.
    Type: Grant
    Filed: April 14, 1997
    Date of Patent: July 13, 1999
    Assignee: Universal Enterprises, Inc.
    Inventors: Ed Frankovitch, Jr., Robert J. Wieners
  • Patent number: 5898307
    Abstract: An engine analyzer having a dual-trace digital oscilloscope display provides a discrete waveform plot area for each trace and displays in each plot area a cursor array which may selectively include one or two vertical-line cursors which can be selectively moved one at a time horizontally along the plot area. The movements of the two cursor arrays can selectively be either synchronized or unsynchronized. The scope provides alphanumeric indications of the position of each cursor, the waveform value at the point where each cursor intersects the waveform. When two cursors are displayed on a trace the scope provides alphanumeric indications of the distance between the cursors and the difference between the waveform values at the points where the cursors intersect the waveform.
    Type: Grant
    Filed: April 10, 1996
    Date of Patent: April 27, 1999
    Assignee: Snap-on Technologies, Inc.
    Inventors: Yosuf M. Taraki, Dale A. Trsar, Richard H. Shepherd, Tyrone J. Moritz, Mark H. Petersen
  • Patent number: 5852789
    Abstract: An engine analyzer having a dual-trace digital oscilloscope includes a memory for storing a library of digitized waveform patterns, the patterns being stored together with identifying data for each pattern and lists of groups of patterns respectively corresponding to different vehicles and/or engines. The analyzer includes a user interface for inputting identifying information relating to the vehicle under test, a waveform acquisition module and a central processor for cooperation with the memory and the oscilloscope for acquiring, digitizing and storing an analog input waveform from the vehicle engine and displaying it on a first trace of the scope in accordance with selected display parameters.
    Type: Grant
    Filed: April 10, 1996
    Date of Patent: December 22, 1998
    Assignee: Snap-on Technologies, Inc.
    Inventors: Dale A. Trsar, Yosuf M. Taraki, Richard H. Shepherd, Tyrone J. Moritz, Mark H. Petersen
  • Patent number: 5834939
    Abstract: A hand-held ignition voltage tester for detecting voltage on a spark plug wire in an ignition system, such as a distributorless ignition system. The tester includes a housing, positive and negative power cables and a capacitive probe for capacitively coupling to the spark plug wire. The capacitive probe generates a voltage signal which is representative of the voltage on the spark plug wire. A plurality of voltage level indicators are mounted to the housing to form a bar graph, with each indicator corresponding to a selected voltage level. A measurement circuit is coupled to the power cables and the capacitive probe for activating the voltage level indicators in response to the voltage signal.
    Type: Grant
    Filed: October 7, 1996
    Date of Patent: November 10, 1998
    Inventor: Surender K. Makhija
  • Patent number: 5804970
    Abstract: A method and apparatus for detecting and displaying automotive fuel injector voltage signal pulse width which includes signal detection circuits for capturing the rising and falling edges of an input signal having positive and negative voltage swings is disclosed. Upon detecting a rising edge or a falling edge of a positive or negative voltage of the input signal, a corresponding software routine is executed to carry out the process of measuring the pulse width of a pulse of the input signal. The measured pulse width is then displayed in numerical and/or histogramic formats.
    Type: Grant
    Filed: February 12, 1996
    Date of Patent: September 8, 1998
    Assignee: Snap-On Technologies, Inc.
    Inventors: Charles N. Villa, Claes Georg Andersson
  • Patent number: 5784284
    Abstract: A data acquisition device permits plotting of cylinder firing cycles, of varying-frequency, on a fixed-plot area of a CRT screen. Each cylinder firing cycle is sampled, at a constant sample rate, and consecutive sets of sample points, each containing a fixed number of sample points, is generated. On the basis of a unique data reduction technique triggered after the collection of each consecutive sample-point set, certain of the sample points considered superfluous are deleted from the set and the remaining appended to a temporary buffer. The sample-points in the temporary buffer further undergo reduction of the sample points when certain conditions occur, such as buffer full, at which time certain ones are discarded and others are kept. At the end of a cylinder firing cycle, the remaining points are further reduced and a final-set is generated, representative of a full cylinder firing waveform, consisting of sample points equal in number to the plot-width of the CRT screen.
    Type: Grant
    Filed: December 29, 1995
    Date of Patent: July 21, 1998
    Assignee: Snap-on Tools Company
    Inventor: Yosuf M. Taraki
  • Patent number: 5778328
    Abstract: An engine analyzer with a digital oscilloscope display includes a processor for controlling the acquisition and display of a high-voltage secondary ignition signal waveform with the use of only a single high-voltage reactive pickup probe, the waveform being displayed with a fixed-time sweep and either auto or signal triggering. The system provides for user selection of the sweep and trigger modes.
    Type: Grant
    Filed: April 10, 1996
    Date of Patent: July 7, 1998
    Assignee: Snap-on Technologies, Inc.
    Inventors: Dale A. Trsar, Richard H. Shepherd, Yosuf M. Taraki, Mark H. Petersen, Tyrone J. Moritz
  • Patent number: 5742276
    Abstract: An engine analyzer has a dual-trace display screen, a waveform acquisition means for obtaining analog waveforms from an associated engine and digitizing them, a memory for storing digitized waveform data and a processor for controlling the operation of the memory and the display. The display is operable in live and freeze modes. The displays on the two traces of the display screen are normally synchronized but, in freeze display mode, the user may selectively deactivate the synchronization.
    Type: Grant
    Filed: April 10, 1996
    Date of Patent: April 21, 1998
    Assignee: Snap-on Technologies, Inc.
    Inventor: Yosuf M. Taraki
  • Patent number: 5719765
    Abstract: A method and apparatus for generating a horizontally-magnified, scrolling drive-trace line on a graphical display screen of an engine analyzer aids a technician in controlling a vehicle's speed over a fixed driving period of successive driving time intervals. Toward this end, an initial drive-trace line is displayed on the screen representing the ideal vehicle speed at which the technician should maintain the vehicle during a first set of successive driving time intervals. A movable iconic marker is displayed on the screen disposed along the displayed initial drive-trace line. The iconic marker is moved horizontally on the screen after each elapsed time interval until the marker reaches a predetermined position along the drive-trace line, after which time the drive trace line is scrolled.
    Type: Grant
    Filed: August 7, 1995
    Date of Patent: February 17, 1998
    Assignee: Snap-on Technologies, Inc.
    Inventor: Jeffrey J. Book
  • Patent number: 5687082
    Abstract: An ignition voltage analysis is performed to provide a combustion diagnosis. A first set of characteristic parameters are provided relating a plurality of spark plug voltage, current or gap impedance waveform signals to a plurality of combustion quality measures. A spark plug voltage, current or gap impedance waveform signal is sampled in real time during a first combustion process. A second set of characteristic parameters are then generated based upon the sampled first spark plug voltage waveform signal. The combustion process is classified as a one of a knocking combustion event, a normal combustion event, a slow burn event, a partial burn event, and a misfire event. The spark plug voltage, current or gap impedance waveform signals are classified according to a statistical closeness to parameters generated by a testing engine operated in each of the above operating modes.
    Type: Grant
    Filed: August 22, 1995
    Date of Patent: November 11, 1997
    Assignee: The Ohio State University
    Inventor: Giorgio Rizzoni
  • Patent number: 5680311
    Abstract: An engine analyzer for plotting engine cylinder firing or spark voltage information, corresponding to distinct points of a cylinder firing waveform, in histograph form to assist in identifying a cylinder-misfire condition. In an illustrative embodiment, two traces are provided. The lower trace depicts a histograph, representative of the firing or spark voltage and engine speed of each cylinder over successive engine cycles. The histograph consists of successive pairs of adjacent, vertical histo-bars, each pair representing voltage and engine speed for a single cylinder. The first histo-bar in each pair represents the spark or firing voltage for a given cylinder and the second histo-bar represents the instantaneous engine speed measured over the duration of the given cylinder. The vertical histo-bar pairs are plotted sequentially from left to right, representing successive cylinder firings.
    Type: Grant
    Filed: December 29, 1995
    Date of Patent: October 21, 1997
    Assignee: Snap-on Tools Company
    Inventors: Dale A. Trsar, Yosuf M. Taraki
  • Patent number: 5675072
    Abstract: To correctly sense combusting conditions of an internal combustion engine, an ion current caused by combustion is detected.
    Type: Grant
    Filed: December 28, 1995
    Date of Patent: October 7, 1997
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yukio Yasuda, Wataru Fukui, Yasuhiro Takahashi
  • Patent number: 5668311
    Abstract: A compression detection apparatus for determining which one of a pair of phase-opposed cylinders is under compression has a capacitive probe coupled to both ends of the secondary winding of an ignition coil servicing both spark plugs of the pair of cylinders. Phase and magnitude of the voltage signal appearing on the capacitive probe line are processed by a single comparator for determining which on of the pair of cylinders is under compression.
    Type: Grant
    Filed: May 8, 1996
    Date of Patent: September 16, 1997
    Assignee: General Motors Corporation
    Inventors: Ronald J. Kiess, Jeff Louis Courter, Mark Albert Paul
  • Patent number: 5668312
    Abstract: A portable apparatus is provided for testing an engine control system of a reciprocating engine. The apparatus includes a processor for generating a simulated waveform of an at least one engine position sensor and a connector for operably coupling the selected waveform to the engine control system.
    Type: Grant
    Filed: July 23, 1996
    Date of Patent: September 16, 1997
    Assignee: Products Research, Inc.
    Inventor: Richard A. Kaman
  • Patent number: 5656770
    Abstract: A method for testing a spark-ignited internal combustion engine is proposed, wherein a pulse-shaped signal derived from the ignition system is made available which signal allocates a pulse (34, 34a, 34b) to each switching process occurring in the ignition system. A first pulse (34) of a pulse group (32, 33) of the signal respectively starts a retriggerable timer (16) which, during its active phase (T.sub.A, T'.sub.A), suppresses the pulses (34a, 34b) of the pulse group (32, 33) following the first pulse (34). The time to be predetermined for the retriggerable timer (16) must be predetermined such that it is longer than the maximum interval (T.sub.1, T.sub.2) between the pulses (34, 34a, 34b) of a pulse group (32, 33). The method according to the invention is particularly suitable for testing a spark-ignited internal combustion engine which is provided with an ignition system comprising a spark band ignition.
    Type: Grant
    Filed: December 26, 1995
    Date of Patent: August 12, 1997
    Assignee: Robert Bosch GmbH
    Inventors: Karl-Heinz Dittmann, Uwe Fischer
  • Patent number: 5644491
    Abstract: An engine monitor includes, in a self-contained preferably sealed unit, a spark sensor, inductively and capacitively coupled through the case to a spark pick up wire, a timer, and a running time detector, responsive to inputs from the spark pick up to provide total running time, job time, and service time metering. Preferably, storage means are included for storing maximum RPM and spark mode data, that is, data indicating the number of firings per RPM for the particular engine, as well as a preset service interval and one or more auxiliary timers.
    Type: Grant
    Filed: January 31, 1994
    Date of Patent: July 1, 1997
    Assignee: SenDEC Corporation
    Inventors: Kenton W. Fiske, Edward G. Reehil, Herbert F. Ley, David L. Sestito
  • Patent number: 5640093
    Abstract: An automotive electronic circuit analyzer that plugs into an automobile's electronic control module is disclosed. The disclosed analyzer includes positive and negative load sensing cells each having a series resistor coupled to an ECM load via the ECM connector and having an LED transistor for conducting current when the ratio between the load and the series resistor exceeds a predetermined value. A regulated power circuit for sinking current from the positive load sensing cells and for supplying current to the negative load sensing cells includes a timing circuit for controlling the active power pulse width so that the LEDs are illuminated with high frequency, short duration power pulses to indicate a shorted load.
    Type: Grant
    Filed: May 23, 1994
    Date of Patent: June 17, 1997
    Assignee: Cardone Industries, Inc.
    Inventors: Michael T. Murray, Luis F. Rodrigues
  • Patent number: 5623209
    Abstract: In a capacitive discharge ignition system there being a first circuit detecting the voltage across the storage capacitor marking the onset of discharge of the storage capacitor, a second circuit detecting the voltage across the storage capacitor marking the substantially complete discharge of the storage capacitor, a third circuit for measuring the time between the events marked by the first and second circuits, and a fourth circuit for analyzing the measured time to determine conditions in the ignition system.
    Type: Grant
    Filed: December 7, 1995
    Date of Patent: April 22, 1997
    Assignee: Altronic, Inc.
    Inventors: Joseph M. Lepley, Gary A. Kleinfelder
  • Patent number: 5550740
    Abstract: A process and a device for controlling an internal combustion engine in which a control unit is temporarily connected to an external tester via an interface. At least one storage device of the control unit is configured as first and second storage elements. The first storage element is supplied with data corresponding to a signal transmitted from the tester. The second storage element is supplied with data from the control unit. Either the contents of the first storage element or the contents of the second storage element are selected, with the contents of the second storage element being selected when the contents of the first storage element have an unallowable value.
    Type: Grant
    Filed: December 5, 1994
    Date of Patent: August 27, 1996
    Assignee: Robert Bosch GmbH
    Inventors: Dieter Hall, Klaus Sassen
  • Patent number: 5530360
    Abstract: An apparatus for diagnosing the presence and location of faults within a vehicle's electrical system includes a signal generator for generating an a.c. test signal; a switching circuit connected to an interface between the system's ECU and the system's components for selectively and sequentially applying the a.c. test signal into each electrical lead therein; and a first detector connected to the system's common ground for detecting the system's response to the applied signals, thereby obtaining a set of transitory characteristics for the vehicle's electrical system.
    Type: Grant
    Filed: December 9, 1994
    Date of Patent: June 25, 1996
    Assignee: Chrysler Corporation
    Inventors: Robert B. Kerchaert, Leon Brank, Neal G. Stupera, Douglas G. Glondeniz
  • Patent number: 5508617
    Abstract: The current invention is directed to a method of measuring an electric power and in particular to a precise power measurement by measuring a current and a voltage of high-frequency distortion waves. The current power measuring method is based upon a summation of the power values measured for every frequency component of the distortion wave. After being frequency converted in a mixer 5, a voltage is inputted from an input terminal 1 through a voltage amplifier 3 to a vector voltmeter 7. A current is supplied into an input terminal 2, and converted into a voltage signal by a current-to-voltage converter 4. Then, the voltage signal is frequency-converted in a mixer 6, and thereafter inputted into a vector voltmeter 8. The input signals to the mixers 5 and 6 are separated into frequency components by sweeping of a local signal generator 10, which are measured by the vector voltmeters.
    Type: Grant
    Filed: March 16, 1994
    Date of Patent: April 16, 1996
    Assignee: Hewlett-Packard Company
    Inventor: Yasuaki Komatsu
  • Patent number: 5493496
    Abstract: An apparatus for identifying the power stroke of a particular cylinder in a multi-cylinder engine which utilizes a wasted spark electronic distributorless ignition system but lacks a camshaft driven cylinder identification sensor, wherein a single sensor can be placed in a coil pack adjacent to and substantially equidistant from the ignition coil towers. The sensor will produce a signal reflecting the difference in voltage drops between corresponding pairs of spark plugs who share the same coil and which utilizes this signal to determine the power stroke of individual cylinders to produce a resulting synthetic cylinder identification signal. This apparatus can further be used as a permanent on-board sensor, thereby negating the need for a separate camshaft driven sensor, to determine the cylinder identification.
    Type: Grant
    Filed: December 15, 1992
    Date of Patent: February 20, 1996
    Assignee: Ford Motor Company
    Inventors: John V. James, James M. Dosdall
  • Patent number: 5481193
    Abstract: An engine analyzer for an internal combustion engine converts an engine waveform into a digital waveform which is displayed on a monitor. The waveform is converted using two analog-to-digital (A/D) conversion channels. A dedicated A/D control microprocessor is used to control the flow of the digital waveform data between the analog-to-digital conversion channels and a main computer. Waveform data transfer to the main computer is over a dedicated, high speed data bus. A peripheral control microprocessor is used to monitor other engine parameters and shares memory with the A/D control microprocessor.
    Type: Grant
    Filed: February 3, 1992
    Date of Patent: January 2, 1996
    Assignee: SPX Corporation
    Inventors: Steve Mueller, Scott Meyers, Chris Lambach, Glenn Stern, Joseph Cochenet, John T. Werth, III, Carlos E. Rodriguez, John N. Wozniak, John Hintz, Richard W. Hansen, Steve Trottier