Michael C Putrow, Age 67Franksville, WI

5296869, Mar 22, 1994

May 14, 1993

8/062145

Gary D. Jonker - Kenosha WI
Craig F. Govekar - Gurnee IL
Michael B. Meeker - Kenosha WI
James R. Piehl - Kenosha WI
Michael C. Putrow - Racine WI
John C. Sniegowski - Kenosha WI

Snap-on Tools Corporation - Kenosha WI

G09G 100

345 24

A digital engine analyzer has an oscilloscope display and is controlled by microprocessors operating under menu-driven stored program control. The analyzer receives analog input signals from an engine being analyzed and calculates and display spark plug burn time information derived from a single analog input signal, the data being displayed in both numerical and bar graph form. The measured burn time is the time that the ignition voltage signal is above a predetermined threshold level which is greater than the amplitude of the ringing portion of the ignition voltage signal.

5247287, Sep 21, 1993

Oct 18, 1991

7/779520

Gary D. Jonker - Kenosha WI
Craig F. Govekar - Gurnee IL
Michael B. Meeker - Kenosha WI
James R. Piehl - Kenosha WI
Michael C. Putrow - Racine WI
John C. Sniegowski - Kenosha WI

Snap-on Tools Corporation - Kenosha WI

G09G 500

345134

A digital engine analyzer has an oscilloscope display and is controlled by microprocessors operating under menu-driven stored program control. The analyzer receives analog input signals from an engine being analyzed, digitizes the signals, captures the digital peak ignition voltage values for each cylinder and stores only these values for each cylinder over a number of successive engine cycles, and then simultaneously displays all the stored values for any one cylinder over a number of engine cycles to provide a historical display. Each peak value is stored twice and displayed twice to provide width to the value display and effectively produce a bar graph-type display.

4851833, Jul 25, 1989

Oct 9, 1987

7/089121

Michael C. Putrow - Kenosha WI
Leonard J. Wisneski - Kenosha WI
Craig F. Govekar - Gurnee IL
Gary D. Jonker - Kenosha WI
Gordon Lindhard - Racine WI
Dennis W. Weidenbenner - Union Grove WI
Robert O. Quinn - Wheeling IL

Snap-on Tools Corporation - Kenosha WI

G09G 116

340722

A microprocessor controlled digital engine analyzer receives analog input signals from an engine being analyzed, engine parameter data entered via a keyboard, and function data, selecting one of several operating modes for the analyzer and which information is to be displayed, entered via the keyboard, and displays on a CRT screen the selected information such as cylinder firing order, RPM, Dwell, KV and DC volts, alphanumerically, information such as primary and secondary ignition and voltage, alternator and fuel injector information through the use of continuous waveform patterns, and additional information pertaining to Dwell, KV and Cylinder Shorting through the use of bar graphs. The waveform pattern data derived from the analog input signals is stored in a dual bank waveform memory and read out for display on the CRT screen under hardware control, and address data representing alphanumeric data and screen formats for the various operating modes to be displayed is stored in a dual bank display memory for application to a character generator, a bank switching arrangement being used for both the waveform memory and the display memory to enable the banks of each memory to be alternately written to and read from. A main microprocessor receives and processes analog input signals, other than the waveform pattern signals, and a display microprocessor receives numerical data from the main microprocessor and causes display of the numerical data on the CRT screen.

5245324, Sep 14, 1993

Oct 18, 1991

7/779509

Gary D. Jonker - Kenosha WI
Craig F. Govekar - Gurnee IL
Michael B. Meeker - Kenosha WI
James R. Piehl - Kenosha WI
Michael C. Putrow - Racine WI
John C. Sniegowski - Kenosha WI

Snap-on Tools Corporation - Kenosha WI

G09G 500

345134

A digital engine analyzer has an oscilloscope display and is controlled by microprocessors operating under menu-driven stored program control. The analyzer receives analog input signals from an engine being analyzed. The analyzer is provided with a scanner interface, so that a scanner designed to read data from a vehicle on-board computer, can transfer this data to the analyzer for display on the analyzer oscilloscope. The analyzer processor, when operating in the scanner interface mode, operates under stored program control to reconfigure analyzer keyboard and soft key functions to duplicate scanner control functions, so that the scanner control functions can be effected from the analyzer.

4804921, Feb 14, 1989

Oct 9, 1987

7/089360

Michael C. Putrow - Kenosha WI
Leonard J. Wisneski - Kenosha WI
Craig F. Govekar - Gurnee IL
Gary D. Jonker - Kenosha WI
Gordon Lindhard - Racine WI
Dennis W. Weidenbenner - Union Grove WI
Robert O. Quinn - Wheeling IL

Snap-on Tools Corporation - Kenosha WI

G01R 1342
G01R 1320
G01R 1904

324394

A microprocessor controlled digital engine analyzer receives analog input signals from an engine being analyzed, engine parameter data entered via a keyboard, and function data, selecting one of several operating modes for the analyzer and which information is to be displayed, entered via the keyboard, and displays on a CRT screen the selected information such as cylinder firing order, RPM, Dwell, KV and DC volts, alphanumerically, information such as primary and secondary ignition and voltage, alternator and fuel injector information through the use of continuous waveform patterns, and additional information pertaining to Dwell, KV and Cylinder Shorting through the use of bar graphs. The waveform pattern data derived from the analog input signals is stored in a dual bank waveform memory and read out for display on the CRT screen under hardware control, and address data representing alphanumeric data and screen formats for the various operating modes to be displayed is stored in a dual bank display memory for application to a character generator, a bank switching arrangement being used for both the waveform memory and the display memory to enable the banks of each memory to be alternately written to and read from. A main microprocessor receives and processes analog input signals, other than the waveform pattern signals, and a display microprocessor receives numerical data from the main microprocessor and causes display of the numerical data on the CRT screen.

4849744, Jul 18, 1989

Oct 9, 1987

7/088888

Michael C. Putrow - Kenosha WI
Craig F. Govekar - Gurnee IL

Snap-on-Tools Corporation - Kenosha WI

G09G 116

340721

A microprocessor controlled digital engine analyzer receives analog input signals from an engine being analyzed, engine parameter data entered via a keyboard, and function data, selecting one of several operating modes for the analyzer and which information is to be displayed, entered via the keyboard, and displays on a CRT screen the selected information such as cylinder firing order,RPM, Dwell, KV and DC volts, alphanumerically, information such as primary and secondary ignition and voltage, alternator and fuel injector information through the use of continuous waveform patterns, and additional information pertaining to Dwell, KV and Cylinder Shorting through the use of bar graphs. The waveform pattern data derived form the analog input signals is stored in a dual bank waveform memory and read out for display on the CRT screen under hardware control, and address data representing alphanumeric data and screen formats for the various operating modes to be displayed is stored in a dual bank display memory for application to a character generator, a bank switching arrangement being used for both the waveform memory and the display memory to enable the banks of each memory to be alternately written to and read from. A main microprocessor receives and processes analog input signals, other than the waveform pattern signals, and a display microprocessor receives numerical data from the main microprocessor and causes display of the numerical data on the CRT screen.

D335093, Apr 27, 1993

Sep 23, 1991

7/764392

Robert J. Holmen - Kenosha WI
Larry D. Pacetti - Kenosha WI
Theodore J. Caron - Kenosha WI
Thomas J. Green - West Bend WI
David R. Ellingen - Kenosha WI
Michael C. Putrow - Racine WI
Craig F. Govekar - Gurnee IL

Snap-on Tools Corporation - Kenosha WI

D10 76

5250935, Oct 5, 1993

Sep 24, 1990

7/587357

Gary D. Jonker - Kenosha WI
Craig F. Govekar - Gurnee IL
Michael B. Meeker - Kenosha WI
James R. Piehl - Kenosha WI
Michael C. Putrow - Racine WI
John C. Sniegowski - Kenosha WI

Snap-on Tools Corporation - Kenosha WI

G09G 500

345134

A digital engine analyzer has an oscilloscope display and is controlled by microprocessors operating under menudriven stored program control. The analyzer receives analog input signals from an engine being analyzed. Peak capture circuitry permits the display of a full cylinder period of a waveform, even though it contains very high frequency portions, by selectively switching between normal and high resolution modes. The circuitry samples the analog waveform at a very high rate and selects samples for display at a much slower display rate. The circuitry captures and stores the highest magnitude sample in each cylinder cycle by storing each sample only if its magnitude exceeds that of the previously stored sample. In the normal mode, at each display clock pulse the most recent sample is selected for display, irrespective of its magnitude. In the high resolution mode the stored peak value is selected for display at each display clock pulse.