CA1155676A - System for servicing an electronic engine tester - Google Patents
System for servicing an electronic engine testerInfo
- Publication number
- CA1155676A CA1155676A CA000372290A CA372290A CA1155676A CA 1155676 A CA1155676 A CA 1155676A CA 000372290 A CA000372290 A CA 000372290A CA 372290 A CA372290 A CA 372290A CA 1155676 A CA1155676 A CA 1155676A
- Authority
- CA
- Canada
- Prior art keywords
- display
- calibration
- tester
- improved system
- processor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Testing Of Engines (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
ABSTRACT
In a principal aspect, the present invention is an improved system for servicing an electronic engine tester. The system includes a display actuator, coupled to the processor.
In response thereto, the processor provides a display signal which results in the simultaneous listing, on a single page, of the engine parameters, monitored and analyzed by the tester, the respective processed output signals therefor, and the respective analog input signals therefor. Based upon this display, the operator or serviceman can simultaneously evaluate the raw data signals received by the processor and the corrected and scaled output data signals for each engine parameter, irrespective of test page order. This permits an immediate determination of potential hardware and software problems. In another aspect, the improved service system includes a calibration actuator, coupled to the processor. Responsive to the calibration actuator, the processor provides a calibration signal which results in the display of the calibration constants for each engine parameter monitored and analyzed by the tester. The display includes an identification of the calibration constant and the magnitude thereof. Based upon the magnitude of the calibration constant or constants, the operator can determine whether a potential hardware problem exists.
In a principal aspect, the present invention is an improved system for servicing an electronic engine tester. The system includes a display actuator, coupled to the processor.
In response thereto, the processor provides a display signal which results in the simultaneous listing, on a single page, of the engine parameters, monitored and analyzed by the tester, the respective processed output signals therefor, and the respective analog input signals therefor. Based upon this display, the operator or serviceman can simultaneously evaluate the raw data signals received by the processor and the corrected and scaled output data signals for each engine parameter, irrespective of test page order. This permits an immediate determination of potential hardware and software problems. In another aspect, the improved service system includes a calibration actuator, coupled to the processor. Responsive to the calibration actuator, the processor provides a calibration signal which results in the display of the calibration constants for each engine parameter monitored and analyzed by the tester. The display includes an identification of the calibration constant and the magnitude thereof. Based upon the magnitude of the calibration constant or constants, the operator can determine whether a potential hardware problem exists.
Description
1~55676 BACKGROUND OF THE INVENTION
The present invention relates generally to an electronic engine tester and more particularly to an improved system for servicing such a tester.
Advancement of the electronic engine tester art has been very rapid over the last five years. The sophisticated state of the art is exemplified by United States Letters Patent No. 4,125,894, issued on November 14, 1978 to Sun Electric Corporation, which discloses an automated engine analysis device employing a digital data processor and a cathode ray tube display.
In such a tester, the processor generally receives a series of digital input signals related to engine operation. The digital input sig-nals derive from two sources: digital signals generated by the input system, such as the TACH or RPM signal for the United States patent No. 4,125,894, and analog signals from the input system which are converted prior to receipt by the processor.
The processor responsively provides a series of output signals re-presentative of various engine parameters for display. The actually dis-played engine parameters depend upon the test page selected by the operator of the tester.
In processing the digital input signals, the processor utilizes various calibration constants, or calibration voltages, to manipulate the digital input signals and thereby appropriately calibrate the tester. These calibration constants are used to correct for zero and span drifts, for example. The calibration constants are further used in the algorithms used to compute the final output parameter values.
The tester shown in United States patent No. 4,125,894, is self-calibrating. As such, the calibration constants are adjusted periodically, e.g., ' ~r~
, .: -1-.
' 1 ~5567~
during initialization or by operator order.
SUMMARY OF THE PRESENT INVENTION
In a principal aspect, the present invention is an improved system for servicing an electronic engine tester. The system includes a display actuator, coupled to the processor, In response thereto, the processor provides a display signal which results in the simultaneous listing, on a single page, of the engine parameters, monitored and analyzed by the tester, the respective processed output signals therefor, and the respective analog input signals therefor.
Based upon this display, the operator or serviceman can simultaneously evaluate the raw data signals received by the processor and the corrected and scaled output data signals for each engine parameter, irrespective of test page order. This permits an immediate determination of potential hardware and software problems.
; For example, assume the processor monitors water temperature, TEMP.
. .
If the digital input signal for TEMP is zero then the problem is conceivably in the hardware, such as the TEMP transducer. Conversely, if the digital input TEMP signal is present and within an acceptable range, yet the displayed TEMP
is unreasonable, then a potential software problem exists.
In another aspect, the improved service system includes a calibration actuator, coupled to the processor. Responsive to the calibration actuator, the processor provides a calibration signal which results in the display of the cali-bration constants for each engine parameter monitored and analyzed by the :
tester. The display includes an identification of the calibration constant and the magnitude thereof. Based upon the magnitude of the calibration constant or constants, the operator can determine whether a potential hardware problem exists .
Thus it is an object of the present invention to provide an improved system for servicing an electronic engine tester. Another object is an improved service system wherein potential hardware and software problems are distin-`~ ~ 30 guishable. Still another object is an improved service system which substan-. - 2 -1 ~5567~
tially reduces service time.
A more particular object of the present invention is an improved service system for an engine tester wherein the engine parameters, monitored and analyzed by the tester, are simultaneously displayable on a service page. Yet another object is an improved service system wherein the processed output signal and the raw data input signal for each engine parameter are simultaneously displayed, whereby the operator can evaluate the digital and analog data acquisition channels.
Still another object of the present invention is an improved service system for an electronic engine tester wherein the calibration constants, utilized by the tester, are controllably displayed. It is also an object to provide an improved service system wherein the calibration constants for each engine parameter are automatically sequentially displayed.
Broadly stated, according to the invention, there is provided in an engine tester of the type including processor means for receiving a set of analog-based digital input signals representing a conversion of analog input signals and for providing a set of output signals representative of a set of engine parameters analyzed by said tester, said output signals being based upon said analog-based digital input signals, and display means for displaying said output signals, an improved system for servicing said tester comprising, in combination:
display actuator means for producing a display intexrupt signal and initiating a display mode of operation; said processor means, in response to said display interrupt signal, providing a display signal representative of said engine parameters analyzed by said tester, said output signals therefor, and said analog input signals therefor; said display means responsively displaying on a single service page, a listing of said engine parameters, said output signals, and said analog input signals.
: `
; - 3 -; B
::.
1~55676 The invention will now be described in greater detail with reference to the accompanying drawings, in which:
Figure 1 is a schematic block diagram of an electronic engine tester incorporating a preferred embodiment of the present invention; and Figures 2a to 2e represent a flow chart illustrating operation of the preferred embodiment of Figure 1.
Referring to Figures 1 and 2a to 2e, a preferred embodiment of the present invention is shown as an improved system 10 for servicing an electronic engine tester, generally designated 12. Such a tester 12 is described, in detail, in United States Patent No. 4,125,894, and generally includes input means 14 for producing analog and digital signals indicating or representing engine operation, conversion means 16 for converting the analog signals into digital input . .
:....
~ . .
,.....
, ,1 ;
';; s - 3a -."' ~, . . . ~
1 ~567~
signals, processor means 18 for ~rocessing the digital input signals and re-sponsively producing output signals representative of engine parameters, and display means 20 for displaying the output signals.
More particularly, the ioput means 14 includes a series of Eront end interfaces, designated 1, 2...N. The interface 1, such as a signal pre-processor, provides a first set of digital input signals directly to the pro-ccssor means 18. Ihe outputs oF the remaining front end interfaces 2-N are analog rcpresontations of various engine parameters.
I`he conversion means 16 includes an analog multiplexer, a variable gain ampliEier and an analog-to-digital converter, interconnected as shown.
Through the conversion means 16, the analog representations of engine param~
eters are converted to digital representations for receipt by the processor means 18.
The processor means 18 coordinates the operation of the input means 14 and conversion msans 16. The processor means 18 controls range selection on the front end interfaces, controls the analog representation selection in the analog multiplexer, and controls the gain of the amplifier. The proces-sor means 18 also reads the digital voltage information from the front end in-terface 1 and the converter. The processor means 18 includes a RAM and a ROM.
As amply described in the above referenced patent, the display of the output signals generally includes an identification of the engine param-eter, the units of the engine parameter, and the numeric value thereof. Thus, ; a typical display is:
As fllso described in the above referenced patent, and as well known in the art, the processor means 18 manipulates the digital input signals re-lated to each engine parameter by one or more calibration constants. The cal-ibration constants are utilized to substantially minimize the effect of drift within the components of the tester 12 and to effect zeroing.
';
,'' .
.
1 ~55t~7~
The system 10 includes display actuator means 22 for initiating a display mode of operation and calibration actuator means 24 for initiating a calibration mode. As shown, the display actuator means 22 is connected to the processor means 18 and provides a display interrupt signal when actuated.
This display interrupt signal is assigned a high priority by the processor means 18.
In this preferred embodiment, the display actuator means 22 is manu-ally actuated by the operator of the tester 12. Preferably, the display actuator means 22 includes a switch mechanism (not shown) inconspicuously mounted within the chassis of the tester 1 2 to substantially avoid inadvertent actuation.
In response to the display actuator means 22, the processor means 18 terminates activity, except for updating of the output signals. The processor means 18 also responsively provides a display signal to the display means 20.
The display means 20 displays, in this preferred embodiment, a listing of the engine parameters monitored and analyzed by the tester 12, the value of the processed output signals, the units thereof, e. g., volts or amperes or RPM, ; and the value of the analog input signal, I ., the raw data signal, if any. The .
display for a typical display signal is shown below:
;~i; SERVICE DISPLAY
;` DWELL 38. 6 %
TIMING 8. 2 DEG
VACUUM 15. 2 "HG 3. 127 HC 987 PPM 2. 508 CO 0.39% 1.634 AMPS 3. 5 AMPS 0. 278 VOLTS 0. 0 VOLTS 0. 000 OHMS 5. 7K OHMS 4. 782 DIST RES 0. 22 VOLTS 2. 391 BATTERY 11. 3 VOLTS 5. 642 LINE VOLT127 VOLTS 5. 236 TEMP 73 C 3. 647 Taking "TEMP" as an example, "TEMP" is the engine parameter iden-tification for water temperature. The present output signal, i. e., the present .: .
water temperature, is "73 C" and the present value of the analog input signal ,, ;. :, , :
~ ,....
1 ~567~
is "3. 647" volts. Preferably, the engine parameters, and the units thereof, listed in the display mode are stored in the ROM of the processor means 18.
No input signal is shown for "TACH" "DWELL" and "TIMING". This is due to the fact these digital input signals are derived from digital signals provided by front end interface 1 of the input means 14.
- With this display, the operator can simultaneously view the digital and analog acquisition channels for the engine parameters analyzed by the tester 12 and thereby evaluate the tester 12 and its performance characteristics.
This display is particularly significant and helpful for quality control during production, as the display immediately shows any major malfunction in the tester 12. In the field, this display is helpful in that the serviceman can antic-ipate and correct potential problems, thereby avoiding a future service call and corresponding downtime.
The calibration actuator means 24 is also manually activated, prefer-ably by a two-button control 26. The buttons 28, 30 are labeled "#" and "HOLD"
in the commercial embodiment of the present invention.
In response to depression of the "#" button Z8, and corresponding ini-tiation of the calibration mode, the processor means 18 isolates or selects and updates a single, predetermined engine parameter on the display. In this pre-ferred embodiment, the initially selected engine parameter is the first listed parameter of the display mode and is designated by a cursor "~>" at the left thereof.
When the cursor "~" designates a purely digital parameter, such as "TACH" or an analog parameter which does not have a related calibration con-stant to be updated, then the display remains the same, except for updating.
When the cursor ">" designates an analog parameter which requires the update of a calibration constant, then the processor means 18 places control ; signals along a conductor bus 17 to set up predetermined calibration conditions.
The set up calibration conditions yield analog voltages which are readable by . .:"
5 ~ 7 ~
CPU 18 to update the calibration constants which are displayed and internally stored. Where update of more than one calibration constant is required, the constants are displayed successively, one-at-a-time, on the line that the cursor . , .
is designating.
For example, the engine parameter "HC" has a related calibration con-stant identified as "ZERO". This constant represents a voltage constant utilized by the processor means 18 to zero correct the "HC" digital input signal each time an HC signal is read by CPU 18 via Analog-to-Digital Converter 19.
When the cursor "3" designates "HC" as the engine parameter under in-10 vestigation in the calibration mode, the display of "HC 987 PPM 2. 508" termi-nates and is replaced by the display of "HC ZERO XXX PPM 0. 025", for exam-ple, where XXX may be blanked or a meaningless value. Each calibration con-stant is sequentially displayed on the line of the engine parameter for a predeter-mined time under control of the processor means 18. After full display thereof, the engine parameter is again displayed as in the display mode, and after a pre-determir~d time, the cursor ">" sequences to the next engine parameter. The newly acquired values of the calibration constants are stored in RAM.
Thus, the operator may observe a storing of values for calibration constants, in a slower than normal fashion.
The standard or automatic sequencing in the calibration mode can be modified by the operator using the "#" and "HOLD" buttons 28, 30. Three op-tions are available If the "#" button 28 is depressed, the cursor "~" will move or se-quence to the next line, i. e., the next engine parameter. If the "HOLD"
button is depressed, sequencing is suspended. This allows the operator or serviceman to make any desired adjustments which might cure an uncovered problem. If both the "#" and "HOLD"buttons 28, 30 are depressed, the cursor "~", under control of the processor means 18, moves upwardly to the previ-ously selected parameter. Thus, the sequence means 24 provides quick access : ~ ~5567~
to a potential problem area, thereby decreasing service time.
A single preferred embodiment of the present invention has been de-scribed. It should be understood, however, that the true scope and spirit of the present invention is defined by the following claims, as interpreted in light of the foregoing specification.
The present invention relates generally to an electronic engine tester and more particularly to an improved system for servicing such a tester.
Advancement of the electronic engine tester art has been very rapid over the last five years. The sophisticated state of the art is exemplified by United States Letters Patent No. 4,125,894, issued on November 14, 1978 to Sun Electric Corporation, which discloses an automated engine analysis device employing a digital data processor and a cathode ray tube display.
In such a tester, the processor generally receives a series of digital input signals related to engine operation. The digital input sig-nals derive from two sources: digital signals generated by the input system, such as the TACH or RPM signal for the United States patent No. 4,125,894, and analog signals from the input system which are converted prior to receipt by the processor.
The processor responsively provides a series of output signals re-presentative of various engine parameters for display. The actually dis-played engine parameters depend upon the test page selected by the operator of the tester.
In processing the digital input signals, the processor utilizes various calibration constants, or calibration voltages, to manipulate the digital input signals and thereby appropriately calibrate the tester. These calibration constants are used to correct for zero and span drifts, for example. The calibration constants are further used in the algorithms used to compute the final output parameter values.
The tester shown in United States patent No. 4,125,894, is self-calibrating. As such, the calibration constants are adjusted periodically, e.g., ' ~r~
, .: -1-.
' 1 ~5567~
during initialization or by operator order.
SUMMARY OF THE PRESENT INVENTION
In a principal aspect, the present invention is an improved system for servicing an electronic engine tester. The system includes a display actuator, coupled to the processor, In response thereto, the processor provides a display signal which results in the simultaneous listing, on a single page, of the engine parameters, monitored and analyzed by the tester, the respective processed output signals therefor, and the respective analog input signals therefor.
Based upon this display, the operator or serviceman can simultaneously evaluate the raw data signals received by the processor and the corrected and scaled output data signals for each engine parameter, irrespective of test page order. This permits an immediate determination of potential hardware and software problems.
; For example, assume the processor monitors water temperature, TEMP.
. .
If the digital input signal for TEMP is zero then the problem is conceivably in the hardware, such as the TEMP transducer. Conversely, if the digital input TEMP signal is present and within an acceptable range, yet the displayed TEMP
is unreasonable, then a potential software problem exists.
In another aspect, the improved service system includes a calibration actuator, coupled to the processor. Responsive to the calibration actuator, the processor provides a calibration signal which results in the display of the cali-bration constants for each engine parameter monitored and analyzed by the :
tester. The display includes an identification of the calibration constant and the magnitude thereof. Based upon the magnitude of the calibration constant or constants, the operator can determine whether a potential hardware problem exists .
Thus it is an object of the present invention to provide an improved system for servicing an electronic engine tester. Another object is an improved service system wherein potential hardware and software problems are distin-`~ ~ 30 guishable. Still another object is an improved service system which substan-. - 2 -1 ~5567~
tially reduces service time.
A more particular object of the present invention is an improved service system for an engine tester wherein the engine parameters, monitored and analyzed by the tester, are simultaneously displayable on a service page. Yet another object is an improved service system wherein the processed output signal and the raw data input signal for each engine parameter are simultaneously displayed, whereby the operator can evaluate the digital and analog data acquisition channels.
Still another object of the present invention is an improved service system for an electronic engine tester wherein the calibration constants, utilized by the tester, are controllably displayed. It is also an object to provide an improved service system wherein the calibration constants for each engine parameter are automatically sequentially displayed.
Broadly stated, according to the invention, there is provided in an engine tester of the type including processor means for receiving a set of analog-based digital input signals representing a conversion of analog input signals and for providing a set of output signals representative of a set of engine parameters analyzed by said tester, said output signals being based upon said analog-based digital input signals, and display means for displaying said output signals, an improved system for servicing said tester comprising, in combination:
display actuator means for producing a display intexrupt signal and initiating a display mode of operation; said processor means, in response to said display interrupt signal, providing a display signal representative of said engine parameters analyzed by said tester, said output signals therefor, and said analog input signals therefor; said display means responsively displaying on a single service page, a listing of said engine parameters, said output signals, and said analog input signals.
: `
; - 3 -; B
::.
1~55676 The invention will now be described in greater detail with reference to the accompanying drawings, in which:
Figure 1 is a schematic block diagram of an electronic engine tester incorporating a preferred embodiment of the present invention; and Figures 2a to 2e represent a flow chart illustrating operation of the preferred embodiment of Figure 1.
Referring to Figures 1 and 2a to 2e, a preferred embodiment of the present invention is shown as an improved system 10 for servicing an electronic engine tester, generally designated 12. Such a tester 12 is described, in detail, in United States Patent No. 4,125,894, and generally includes input means 14 for producing analog and digital signals indicating or representing engine operation, conversion means 16 for converting the analog signals into digital input . .
:....
~ . .
,.....
, ,1 ;
';; s - 3a -."' ~, . . . ~
1 ~567~
signals, processor means 18 for ~rocessing the digital input signals and re-sponsively producing output signals representative of engine parameters, and display means 20 for displaying the output signals.
More particularly, the ioput means 14 includes a series of Eront end interfaces, designated 1, 2...N. The interface 1, such as a signal pre-processor, provides a first set of digital input signals directly to the pro-ccssor means 18. Ihe outputs oF the remaining front end interfaces 2-N are analog rcpresontations of various engine parameters.
I`he conversion means 16 includes an analog multiplexer, a variable gain ampliEier and an analog-to-digital converter, interconnected as shown.
Through the conversion means 16, the analog representations of engine param~
eters are converted to digital representations for receipt by the processor means 18.
The processor means 18 coordinates the operation of the input means 14 and conversion msans 16. The processor means 18 controls range selection on the front end interfaces, controls the analog representation selection in the analog multiplexer, and controls the gain of the amplifier. The proces-sor means 18 also reads the digital voltage information from the front end in-terface 1 and the converter. The processor means 18 includes a RAM and a ROM.
As amply described in the above referenced patent, the display of the output signals generally includes an identification of the engine param-eter, the units of the engine parameter, and the numeric value thereof. Thus, ; a typical display is:
As fllso described in the above referenced patent, and as well known in the art, the processor means 18 manipulates the digital input signals re-lated to each engine parameter by one or more calibration constants. The cal-ibration constants are utilized to substantially minimize the effect of drift within the components of the tester 12 and to effect zeroing.
';
,'' .
.
1 ~55t~7~
The system 10 includes display actuator means 22 for initiating a display mode of operation and calibration actuator means 24 for initiating a calibration mode. As shown, the display actuator means 22 is connected to the processor means 18 and provides a display interrupt signal when actuated.
This display interrupt signal is assigned a high priority by the processor means 18.
In this preferred embodiment, the display actuator means 22 is manu-ally actuated by the operator of the tester 12. Preferably, the display actuator means 22 includes a switch mechanism (not shown) inconspicuously mounted within the chassis of the tester 1 2 to substantially avoid inadvertent actuation.
In response to the display actuator means 22, the processor means 18 terminates activity, except for updating of the output signals. The processor means 18 also responsively provides a display signal to the display means 20.
The display means 20 displays, in this preferred embodiment, a listing of the engine parameters monitored and analyzed by the tester 12, the value of the processed output signals, the units thereof, e. g., volts or amperes or RPM, ; and the value of the analog input signal, I ., the raw data signal, if any. The .
display for a typical display signal is shown below:
;~i; SERVICE DISPLAY
;` DWELL 38. 6 %
TIMING 8. 2 DEG
VACUUM 15. 2 "HG 3. 127 HC 987 PPM 2. 508 CO 0.39% 1.634 AMPS 3. 5 AMPS 0. 278 VOLTS 0. 0 VOLTS 0. 000 OHMS 5. 7K OHMS 4. 782 DIST RES 0. 22 VOLTS 2. 391 BATTERY 11. 3 VOLTS 5. 642 LINE VOLT127 VOLTS 5. 236 TEMP 73 C 3. 647 Taking "TEMP" as an example, "TEMP" is the engine parameter iden-tification for water temperature. The present output signal, i. e., the present .: .
water temperature, is "73 C" and the present value of the analog input signal ,, ;. :, , :
~ ,....
1 ~567~
is "3. 647" volts. Preferably, the engine parameters, and the units thereof, listed in the display mode are stored in the ROM of the processor means 18.
No input signal is shown for "TACH" "DWELL" and "TIMING". This is due to the fact these digital input signals are derived from digital signals provided by front end interface 1 of the input means 14.
- With this display, the operator can simultaneously view the digital and analog acquisition channels for the engine parameters analyzed by the tester 12 and thereby evaluate the tester 12 and its performance characteristics.
This display is particularly significant and helpful for quality control during production, as the display immediately shows any major malfunction in the tester 12. In the field, this display is helpful in that the serviceman can antic-ipate and correct potential problems, thereby avoiding a future service call and corresponding downtime.
The calibration actuator means 24 is also manually activated, prefer-ably by a two-button control 26. The buttons 28, 30 are labeled "#" and "HOLD"
in the commercial embodiment of the present invention.
In response to depression of the "#" button Z8, and corresponding ini-tiation of the calibration mode, the processor means 18 isolates or selects and updates a single, predetermined engine parameter on the display. In this pre-ferred embodiment, the initially selected engine parameter is the first listed parameter of the display mode and is designated by a cursor "~>" at the left thereof.
When the cursor "~" designates a purely digital parameter, such as "TACH" or an analog parameter which does not have a related calibration con-stant to be updated, then the display remains the same, except for updating.
When the cursor ">" designates an analog parameter which requires the update of a calibration constant, then the processor means 18 places control ; signals along a conductor bus 17 to set up predetermined calibration conditions.
The set up calibration conditions yield analog voltages which are readable by . .:"
5 ~ 7 ~
CPU 18 to update the calibration constants which are displayed and internally stored. Where update of more than one calibration constant is required, the constants are displayed successively, one-at-a-time, on the line that the cursor . , .
is designating.
For example, the engine parameter "HC" has a related calibration con-stant identified as "ZERO". This constant represents a voltage constant utilized by the processor means 18 to zero correct the "HC" digital input signal each time an HC signal is read by CPU 18 via Analog-to-Digital Converter 19.
When the cursor "3" designates "HC" as the engine parameter under in-10 vestigation in the calibration mode, the display of "HC 987 PPM 2. 508" termi-nates and is replaced by the display of "HC ZERO XXX PPM 0. 025", for exam-ple, where XXX may be blanked or a meaningless value. Each calibration con-stant is sequentially displayed on the line of the engine parameter for a predeter-mined time under control of the processor means 18. After full display thereof, the engine parameter is again displayed as in the display mode, and after a pre-determir~d time, the cursor ">" sequences to the next engine parameter. The newly acquired values of the calibration constants are stored in RAM.
Thus, the operator may observe a storing of values for calibration constants, in a slower than normal fashion.
The standard or automatic sequencing in the calibration mode can be modified by the operator using the "#" and "HOLD" buttons 28, 30. Three op-tions are available If the "#" button 28 is depressed, the cursor "~" will move or se-quence to the next line, i. e., the next engine parameter. If the "HOLD"
button is depressed, sequencing is suspended. This allows the operator or serviceman to make any desired adjustments which might cure an uncovered problem. If both the "#" and "HOLD"buttons 28, 30 are depressed, the cursor "~", under control of the processor means 18, moves upwardly to the previ-ously selected parameter. Thus, the sequence means 24 provides quick access : ~ ~5567~
to a potential problem area, thereby decreasing service time.
A single preferred embodiment of the present invention has been de-scribed. It should be understood, however, that the true scope and spirit of the present invention is defined by the following claims, as interpreted in light of the foregoing specification.
Claims (11)
1. In an engine tester of the type including processor means for re-ceiving a set of analog-based digital input signals representing a conversion of analog input signals and for providing a set of output signals representative of a set of engine parameters analyzed by said tester, said output signals being based upon said analog-based digital input signals, and display means for dis-playing said output signals, an improved system for servicing said tester com-prising" in combination: display actuator means for producing a display inter-rupt signal and initiating a display mode of operation; said processor means, in response to said display interrupt signal, providing a display signal repre-sentative of said engine parameters analyzed by said tester, said output signals therefor, and said analog input signals therefor; said display means responsively displaying, on a single service page, a listing of said engine parameters, said output signals, and said analog input signals.
2. An improved system as claimed in claim 1 wherein processor means updates said output signals and said analog input signals during said display mode.
3. An improved system as claimed in claim 1 further comprising cali-bration actuator means for providing a calibration interrupt signal and initiating a calibration mode of operation, said processor means manipulating said analog-based digital input signals in accordance with a set of calibration constants re-lated to each of said engine parameters analyzed by said tester.
4. An improved system as claimed in claim 3 wherein said processor means, in response to said calibration interrupt signal, controllably selects one of said engine parameters and causes generation of a calibration signal related thereto, said display means responsively displaying said one of said engine parameters, an identification of each of said calibration constants related thereto and the magnitude of each of said calibration signals.
5. An improved system as claimed in claim 4 wherein said display means displays each of said calibration constants for a predetermined period of time.
6. An improved system as claimed in claim 5 wherein each of said calibration constants is singularly displayed.
7. An improved system as claimed in claim 4 wherein said calibration actuator means controls selection of said one of said engine parameters by said processor means.
8. An improved system as claimed in claim 3 wherein said processor means, in response to said calibration interrupt signal, causes generation of a calibration signal representative of said engine parameters and said calibration constants; said display means responsively displaying said engine parameters, an identification of said calibration constants and the magnitude thereof.
9. An improved system as claimed in claim 8 wherein said display means displays each of said identifications and said magnitudes for a predetermined period of time.
10. An improved system as claimed in claim 8 wherein said calibra-tion actuator means further defines control means fo r controlling the sequence of display of said calibration constants.
11. An improved system as claimed in claim 10 wherein said proces-sor means, in response to said control means, selects a predetermined one of said engine parameters for display of said calibration constants related thereto.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14166780A | 1980-04-18 | 1980-04-18 | |
| US141,667 | 1980-04-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1155676A true CA1155676A (en) | 1983-10-25 |
Family
ID=22496677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000372290A Expired CA1155676A (en) | 1980-04-18 | 1981-03-04 | System for servicing an electronic engine tester |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1155676A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT4260U3 (en) * | 2000-12-13 | 2002-12-27 | Avl List Gmbh | METHOD AND PARAMETERIZATION OF A TESTBED OR test field |
-
1981
- 1981-03-04 CA CA000372290A patent/CA1155676A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT4260U3 (en) * | 2000-12-13 | 2002-12-27 | Avl List Gmbh | METHOD AND PARAMETERIZATION OF A TESTBED OR test field |
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