US 5,852,789 A · Engine analyzer with pattern library linked to vehicle ID and display scope configuration

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. The system automatically selects a stored list of patterns corresponding to the vehicle under test and then compares the items in that list one at a time with each of a sequence of search criteria, which criteria may include the particular input pickup lead from which the input waveform is acquired and the sweep selected for the display of that waveform, eliminating from the list any library pattern which fails to meet all the search criteria to produce a set of relevant library patterns which can then be displayed selectively, one-at-time, on the second trace of the scope.

Claims16

Dependent claims

Apparatus for selecting from a library of a plurality of pre-programmed digitized waveform patterns a set of patterns meeting predetermined criteria, said apparatus comprising:

a memory simultaneously storing the library of preprogrammed waveform patterns along with identifying data including a group identifier for each such pattern,
said memory including means for storing lists of groups of the waveform patterns with each list including patterns with the same group identifier criterion, and wherein said criteria include a selected group identifier,
a user-operable switch for selective determining of the criteria, and
a processor coupled to the memory and to the switch and operable under stored program control for automatically comparing the identifying data for the patterns in the library with the criteria and selecting a set of those patterns which meet all the criteria,
said processor including means for initially selecting the list of library patterns having a group identifier corresponding to that of the group identifier criterion, and then comparing the patterns in the list one at-a-time with each of the remaining criteria and eliminating from the list those patterns which fail to meet all the remaining criteria.

2 more elements

Apparatus to permit visual comparison of an analog input waveform pattern from a source with a library of digitized waveform patterns, comprising:

waveform acquisition means for receiving the analog input waveform and digitizing it to produce digitized input waveform data representative of the analog input waveform,
memory means for storing the digitized input waveform data and for storing the library of digitized waveform patterns along with identifying data for each such pattern,
a display device having a dual-trace screen display,
processing means coupled to the memory means and to the display device and operating under stored program control for displaying the stored input waveform data on a first trace of the display device, and
switch means coupled to said processing means for selecting search criteria,
said processing means including means for automatically comparing the selected search criteria with the identifying data for the waveform patterns in the library to select a set of library patterns which meet all the criteria,
said switch means including means cooperating with said processing means for displaying on a second trace of the display device a selected waveform pattern from the set.

4 more elements

Dependencies are inferred from the claim text.

Engine analyzer with pattern library linked to vehicle ID and display scope configuration

Life of this patent

Engine analyzer with pattern library linked to vehicle ID and display scope configuration

Life of this patent

Abstract

Claims16