MXPA97001038A - Method and apparatus for the detection and acquisition of the impulse width of an automot fuel injector - Google Patents

Abstract

The present invention relates to a method and apparatus for detecting and displaying the pulse width of the voltage signal of an automotive fuel injector that includes signal detection circuits for capturing the rising and falling edges of an input signal that It has positive and negative feedback oscillations. Upon detecting an ascending edge or a falling edge of a positive or negative voltage of the input signal, a corresponding programming routine is executed to carry out the method of measuring the pulse width of a pulse of the input signal. The pulse width measured in numerical and / or histogrammic formats is then described

Description

METHOD AND APPARATUS FOR THE DETECTION AND ACQUISITION OF THE IMPULSE WIDTH OF AN AUTOMOTIVE FUEL INJECTOR BACKGROUND OF THE INVENTION FIELD OF THE INVENTION The present invention relates in general to an apparatus for the measurement of electronic signals, and very particularly to a system for detecting and acquiring the pulse width of the voltage signal in an automotive fuel injector. regardless of the type of the fuel injector.

DESCRIPTION OF THE PREVIOUS TECHNIQUE In the field of automotive repair, as well as in other fields, it has long been important to have available instruments for measuring the electrical signals that occur from various products within numerous electrical circuits and signal paths inherent in A car.

Measurements of parameters such as current, voltage, resistance, signal frequency, etc. They allow a technician in repairs to locate and diagnose the many problems that occur in a vehicle. These parameters are typically measured using available devices ranging from simple voltage meters, current to sophisticated electronic computerized or electronic diagnosis. A signal of particular interest is the voltage signal of a fuel injector, more specifically, the pulse width of the voltage signal as detected in the fuel injector. The fuel injectors of a car receive periodic voltage pulses of a duration such as that specified by the car's computer module. In an operation, the computer module receives an oxygen sensor signal indicating the amount of oxygen remaining after the combustion of the air and fuel mixture. In response to the + signal, the computer module adjusts the amount of fuel to be injected by the injectors by varying the pulse width of the voltage signal sent to the fuel injectors. There are generally two methods of activation for fuel injectors, that controlled on the side of the feed stream and controlled on the side of the earth. Figures 1-Id illustrate four types of controlled pulses on the side of the supply current that can be detected at the voltage terminals of the fuel injector. The ground symbols do look as a reference point for the voltage signals described. In FIG. 1, there is illustrated a pulse 10 of the fuel injector type with access (PFI) consisting of a base pulse 12 and a contouring impulse 14. The vector Ib illustrates a "peak and retention" pulse 16. "or" limited current "consisting of a base pulse 18 and two pulses of con ratsion as indicated by 20 and 22. Figure lc illustrates a modulated pulse 24 with a rupture counter tension consisting of a base pulse 26 immediately followed by two (or more) short brown impulses (28 and 30) and a rupture counter tension 32. In FIG. Id, a modulated pulse 34 with two rupture counter-stresses is constituted by a base pulse 36 followed by a breakthrough contusion pulse 38, two (or more) short-wave impulses (40 and 42) and another pulse. Breaking resistor 44. Note that the breakdown surge impulses are typically much larger than the base impulses and are illustrated with interrupted points to emphasize the voltage differences. Figures 4a-4d illustrate four types of ground side pulse that can be detected in a fuel injector. In the figure, there is an impulse 46 of the PFT type with a base imputation 48 downwards followed by a rupture counter tension 50. In Figure 4b, there is a pulse 5? B "peak and retention" or "limited current" consisting of a base pulse 54 followed by two rupture counter tension pulses (56 and 58). Figure 4c illustrates a modulated pulse 60 with a breakdown counter-tension with a base pulse 62 followed immediately by two (or more) short-wave impulses (64 and 66) and in a break-contact pulse 68. In Figure 4d, a pulse modulated with two rupture counter-stresses 70 is constituted by a base pulse? 7 followed by a rupture counter tension 74, two (or more) shorter impulses (76 and 78) and another impulse rupture counter-tension 00 All the detected breakdown impulse impulses are derived from the operation of the fuel injection injector and are explained in more detail below. The base pulse number "short", especially the modulated injectors (one or two breakdown surges, on the side of the supply current or the grounding side) varies with the duration of the total element of the injector. The duration of the first base pulse (is wider) is relatively fixed, and is the amount of time it takes for the current flowing to the injector to drive the needle. In order to maintain the needle in the actuated state that allows a greater amount of injected fuel, shorter base pulses are produced. The figures of the voltage signals of the modulated injectors (Figures Ie, Id, and 4b) represent the waveforms in a particular pulse width (around 2.5 rns). At a short pulse width (around 2 s), there may be only the shortest pulse; in a longer pulse width (around 5 rns), there may be 6 or 7 short pulses. To summarize, the wider base pulse is generally fixed and the number of shorter base pulses increases or decreases to adjust the total pulse width. During the operation of a controlled injector on the side of the supply current, a positive voltage signal is applied by the vehicle computer module which causes the current to flow through the slicing of the injector to produce a magnetic field that drives the needle to allow the fuel to be injected through the opening of the valve into the combustion chamber of a cylinder. The pulse width of the voltage signal corresponds to the duration or amount of time that the needle remains actuated and therefore the amount of fuel injected into the cylinder. If a high level of oxygen remains after combustion (indicating a "deficient" air and fuel mixture), the oxygen sensor detects and reports such condition to the computer module and the computer module in response increases the width of the impulse of the voltage signal sent to the fuel injector and thereby increases the amount of fuel injected into the cylinder. i the oxygen sensor detects and informs about an inconveniently low level of oxygen (indicates a "rich" air-fuel mixture condition), the computer-a module in response to such condition decreases the duration of the voltage signal to decrease the amount of fuel injected into the cylinder. By diverting the voltage to the injector winding ñfrom the falling edge of the pulse), there is a breakdown counter pulse that generates the magnitude that greatly exceeds the magnitude of the base pulse due to the evanescent magnetic field within the injector. The injectors controlled on the grounding side operate in the same way as the injectors controlled on the side of the supply current, with the difference that it supplies the injectors with a constant voltage through the vehicle's electrical system, and the computer module. supplies or removes a ground connection to the injector to control the flow of current. When a ground connection is supplied to the injector, the needle is operated to allow the fuel to be injected into the <;? l indro. In addition to the signal from the oxylene sensor, the computer module receives other input signals that can cause the computer module to adjust the pulse width of the voltage signal with the fuel injectors in response to the input signals. In this way, by varying the input signal to the computer module which causes the computer module to adjust the pulse width of the voltage signal to the fuel injectors and by observing the voltage signal detected in a fuel injector, the operation of a number of subsystems can be diagnosed for an adequate operation. The measuring systems according to the technique before the observation of the modulation of the voltage pulse width of an injector are difficult to use or imprecise. Such systems include oscilloscopes, digital meters with the capacity to measure the pulse width and digital multimeters with special capacity to measure the pulse width in the fuel injectors. For an oscilloscope, the user must manually synchronize the voltage signal of the injector and measure and manually calculate the start times of the impulse activity in order to obtain the pulse width. This is a time-consuming procedure prone to impulse measurement errors. For the linear meters that have the ability to measure the pulse width, the measured and displayed values are generally incorrect due to the fact that this type of meter typically uses a voltage reference at a single point. The pulse width of a voltage signal in a fuel injector usually consists of one or more base pulses and one or more counter-impulse pulses of inductors. A voltage reference at a single midpoint, either the width of a base pulse or the width of a breakdown voltage impulse but not both, and is therefore unable to correctly detect the true pulse width. Digital millimeters according to the prior art which are distinguished by the ability to measure a pulse width in a fuel injector require the user to first identify whether the injector is a controlled injector on the supply side or controlled side of the connection to ground before connecting the scanner areas of the multimeter to the injector. This additional step must identify the type of injector before using the meter, it impedes efficient diagnosis (and a car and requires the user to have a high level of knowledge of the fuel injector system. The waveform comparisons are used to identify the type of impulse, however, the waveform comparison methods are unable to detect the new types of impulses that can be developed by the manufacturers themselves.

BRIEF DESCRIPTION OF THE INVENTION It is therefore an object of the present invention to provide a method and apparatus for detecting and displaying on the screen the pulse width of a voltage signal in a fuel injector where the signal type of the fuel injector is automatically detected. It is another object of the present invention to provide a method and apparatus for detecting and displaying on the screen the imposed width of a voltage signal in a fuel injector where the user is not required to have any knowledge of the type of fuel injector. It is also another object of the present invention to provide a method and apparatus for detecting and displaying on the screen the pulse width of a voltage signal in a fuel injector where it is possible to easily detect new types of impulse without resorting to a waveform corporation or the use of templates. Briefly, the present invention is embodied in the form of a hand held instrument including signal detection circuits for capturing the rising (or preceding) and descending (or following) edges of an input signal having positive voltage oscillations and negative. Transverse an ascending edge or a falling edge of a positive or negative voltage of the input signal, a corresponding programming routine is executed to carry out the procedure of measuring the pulse width of a pulse of the input signal. The pulse width measured in numerical and / or hi-log formats is then displayed on the screen. An important advantage of the present invention is that the type of fuel injector signal is automatically detected. Another advantage of the present invention is that the user is not required to have any knowledge regarding the type of fuel injector. of operating the apparatus that formulates the present invention. Another advantage of the present invention is that the new types of impulse are detected without resorting to the comparison of waveforms or templates. These and other objects and advantages of the present invention will undoubtedly be apparent to aspects in the art after having read the following detailed description of the preferred embodiment illustrated in the various figures of the drawings.

IN THE DRAWINGS the Figures - Id illustrate four types of controlled impulse on the side of the feed stream that can be detected at the voltage terminals of a fuel injector controlled on the side of the feed stream; Figures 2a-2d illustrate the detected base portions of the corresponding input signals represented in the Figures Id; Figures 3a-3d show the inductive breakdown counter-tension portions for the corresponding input waveforms of the Figures-Id; Figures 4a-4d illustrate four types of controlled impulse from the side of the ground connection that can be detected at the terminals of a fuel injector controlled from the grounding side; Figures 5a-5d illustrate the base portions detected for the corresponding input waveforms of Figures? a-4d; Figures 6a-6d show the inductive breakdown voltage sensing portions detected for the corresponding input signals of Figures 4a-4d; Figure 7a shows a single voltage signal PFT controlled on the side of the feed stream with several pulses for several periods as they are detected at the voltage terminals of a fuel njector; Figure 7b represents the base portion of a voltage signal shown in Figure 7a; Figure 7c illustrates the detected breakdown counter voltage portion of the voltage signal shown in Figure 7a; Figure 8 is a block diagram illustrating in general the main operating components of the present invention; Figure 9 is a block diagram illustrating in detail the main functional components of the signal conditioner illustrated in Figure 8; Figures 10a-lOd illustrate the process steps for a voltage-controlled signal on the side of the feed stream; Figures 1-11 illustrate the procedure steps for a voltage-controlled signal on the grounding side; and figure 1? shows a representation of the pulse width detected in numeric and histogrammic formats.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES Referring to Figure 7a, it is shown that a typical PFT voltage signal controlled on the side of the supply current as detected at the fuel injector voltage terminals with several pulses for several periods. The pulses 82, 84 and 86 are in the periods ti, t-3 and t5. The pulses 82, 84 are separated by i period t2 and the pulses 84, 86 are separated by the period t4. In a period of typical impulse such as you. t_3 or 5, the activity time could vary from 2 ms to 3 rns at an engine speed (minimum speed) of 100 RPM. With charged acceleration (high motor load), the uptime typically varies from about 20 rns to about 100 RPM at 200 RPM. The typical time between activities around 100 RPM is around 120 rns (based on a typical four-stroke spark ignition engine). With rapid acceleration, the i is cut after activities to a certain degree. However, the time elapsed between the activities is much greater than the activity time. Using this information and observing the impulses, it is noted that the start of an impulse activity is marked by the presence of a base impulse edge after a period in the minimum regime and the fineness of the impulse activity is marked by the occurrence of a breakthrough counter impulse edge followed by a period at minimum speed.

The preferred embodiment of the present invention uses such information, detects and calculates the pulse width, and displays the pulse width detected on a display monitor (liquid crystal display, light emitting diode). Referring now to Figure 8, a generalized block diagram illustrating the subsystems of the preferred embodiment of the present invention includes a signal conditioner 102 for receiving and conditioning the input signal 100, a microcontroller 104 for receiving user signals from? n input device 106 of the user and the conditioned input signals of the signal conditioner 102, and a graphic display device 108 for displaying processed signals that are received from the counter-encoder 104. By developing it in more detail in the figure 9, the signal conditioner 102 is constituted by an adjustment and protection circuit system 110, the compilers 112 and 114, and the filtering and firing circuits 118 and 120. The protection circuit system protects the circuit with a Excessive power of over voltage and the adjustment circuit system adjusts the input voltage to an acceptable level to the system of circu downstream current. A typical acceptable signal level is within the 2.5-volt inas / rnenos scale. The adjusted input signal 101 of the setting and protection circuitry 110 is then evaluated by the analog-to-digital converter 116 to provide digital values for the input to the microcontroller. The digital sample values provide a basis for the microcontroller to determine the voltage oscillation of the adjusted input signal that appears on line 101, and to generate minimum reference voltages at the digital / analog output points. and 124 for the input to the compared 112 in 123 and to the comparator 114 in 125. The reference threshold voltages are typically a positive threshold voltage and a negative one that must exceed the input signal set on the line 101 in order to cause the comparator 112 generates a signal on the lines 113 or the comparator 114 generates a signal on the line 115. More specifically, the comparator 112 detects the adjusted input signal base portion that appears on the line 101. Figures 2a-2d illustrate the detected base portions of the corresponding input signals shown in FIGS. 1-Id, and FIGS. 5a-5d illustrate the base portion detected for the corresponding foundations. input wave patterns of Figures 4a-4dIf, at the same time, Figure 7b represents the base portion of Figure 7a. The comparator 114 detects the inductive portion of the breakdown counter-tension of the adjusted input signal, for example, Figures 3a-3d show the inductive breakdown counter-tension portions for the corresponding input waveforms of the Figures Id, and Figures 6a-6d show the inductive portions of rupture contractors that are detected for the corresponding signals of Figures 4a-4d. Figure 7c illustrates the detected breakdown rate portion of the signal represented by Figure 7a. The signals generated by the comparators are filtered and the signal edges are sharpened by the filtering and firing circuit systems 118 and 120. The signal is then transmitted to the activity entry points 126 and 128 of the microcontroller 104. Note that the Threshold voltages are set only once for a particular input signal. Finally, the microcontroller 104 evaluates the digital values of the receiver sample of the A / A converter Llfi for a certain time, determines whether the voltage signal is a controlled signal from the power supply side or a controlled signal from the side of the ground connection , and sets threshold voltage levels that must exceed the input voltage set on line 101 in order to be detected as an ascending edge (or a falling edge). To identify whether the signal is a voltage signal from the side of the power supply or a voltage signal from the side of the ground connection, the microcontroller checks the digital sample values that represent the adjusted input signal that appears on the line 101. A signal from the power supply side is typically at a voltage close to zero while the injector is off, amounts to the battery voltage of the vehicle when it is on (reflecting the clos) base pulse (s), and it drops to approximately 30 to 40 volts, negative due to the inductive points of the rupture counter tension. The microcontroller can then determine a signal from the power supply side of the observed maximum and minimum voltages (typically +12 volts to approximately -40 volts). Typically, for signals controlled from the grounding side, the observed signal is typically at a vehicle battery voltage while it is off, drops to a voltage close to zero while it is turned on, and inductive breakdown surges result in maximum points close to 50 to 60 positive volts. The controller is able to determine a grounding side signal by observing the signals that are on the scale from 0 volts to 160 volts. After determining the injector type, the microcontroller * 104 f then an appropriate threshold voltage for the comparator 112 and a threshold voltage for the comparator 114 where each threshold voltage is at a sufficient level to sense the presence of? No edge. If the input signal set on line 101 exceeds any of the threshold voltages, it will cause the corresponding comparator to generate a serial which is then filtered and formed with the system of filtration and trigger circuits 118 or 120. nor crocont roiador then receives the processed signal in the activity input anodes 126 or 128 as a signal activity. The microcontroller, upon receiving the activity signals, identifies an ascending edge or a descending edge and executes the corresponding programming routine represented in the flow diagrams of FIGS. 10a-10d and aIll according to another aspect of the invention. present invention. During the application of the algorithm, two chronographs of countdown, the chronograph l and the chronograph 2, are maintained where the interruption of a chronograph 1 or chronograph 2 is triggered when the corresponding chronograph of the countdown has reached zero. Chronograph 1 is used to determine the end of an activity and chronograph 2 is used to inject the pulse width. The two activity signals are referred to as activity 1 and activity 2 signals in the following description in which activity 1 refers to the base portion of a signal and activity 2 refers to the portion of attenuating the signal. of rupture. The microcontroller, having already determined the input voltage signal as a voltage controlled signal from the side of the power supply or a controlled one from the side of the ground connection, selects the corresponding set of programming routines to process the signals received from the entry points of activities. For a controlled signal from the side of the power source, referring to Figure 10a, the step of IR initialization sets activity 1 and activity 2 in interruption on the rising edges (meaning that only one rising edge will trigger a corresponding pro-ration routine and no action will be taken on the ascending edge), and both chronographs will turn off. Upon receiving an interruption, from the rising edge of activity 1, referring to FIG. 10b, the interruption of activity 1 is again set to fire on a falling edge as indicated at 132. In addition, if chronograph 2 does not it is active (138), activity 2 is set in interruption on the descending edges, initialization is started and the chronograph is operated 2. If chronograph 2 has been active (135), the last registered impression of time for the presence of activity 2 as the pulse width and is transferred to memory for later use. The chronograph 2 is then erased, initialized and restarted. If an interruption of the falling edge of activity 1 is triggered, referring to FIG. 10c, the chronograph 1 is stopped and reloaded to expire at some point in the a future in which no interruptions of activities are expected, and it is again operated as indicated in table 142. Upon receiving a falling edge of activity 2, the routine is executed as shown in figure 10. If chronograph 2 is active, the time of chronograph 2 is recorded as the time imprint of the most recent activity. If chronograph 2 is not active, no action is taken. Note that action is not taken for an interruption of the rising edge of activity 2. In the event that an interruption of chronograph 1 occurs due to the fact that chronograph 1 has counted down to zero, stop chronograph 1 and return to Set activity 1 to shoot above an ascending edge. The presence of an interruption of chronograph 1 indicates that a prescribed amount of time has elapsed without receiving edges of activity 1, and in this way the next rising edge indicates the beginning of a new activity of impulse. In the event of an interruption of chronograph 2 due to the fact that chronograph 2 has counted back to zero, this indicates that the duration of the impulse activity has exceeded the maximum count of the chronograph? an accumulation or reimbursement record is incremented to count the number of times this occurs and the chronograph is again operated. 2. In the preferred embodiment of the invention r, the chronograph is hoisted.

I typically turn to 5 rng and the chronograph is raised 2 I I ?? meat to 21 ro. For a controlled signal on the side of the ground connection, referring to the lia-lid figures, the algorithm is the same as the algorithm for a co-rolled signal on the side of the power supply except that what was separated on it. the rising edges now over the descending edges and what was fired over the descending edges now shoots over the rising edges. The pulse width detected and stored in the memory is processed and displayed on the monitor ,, Referring to Figure 12, the resulting pulse width is displayed either numerically or on a histograph showing the variation of the pulse width over time . As an alternate form of deployment, an average impulse width can be calculated and displayed for a specific time. As it is currently applied, the present invention forms part of a graphical representation instrument, digital multimeter and base of atos diagnostic diagnosis, manufactured by Baleo, a branch of Snap On Incorpora, of San José, California. It will be appreciated, however, that the invention could be formulated with an independent unit or as a component part of another indicator or diagnostic system. Furthermore, although the present invention has been described above in terms of a specific embodiment, it is anticipated that alterations and modifications thereof will undoubtedly become apparent to those skilled in the art. It is therefore intended that the following indications be interpreted to cover all such alterations and modifications as corresponds to the true spirit and purposes of the invention.

Claims (6)

NOVELTY OF THE INVENTION CLAIMS

1. A system for detecting, calculating and displaying the activity time of the pulse activities of variable duration in an input signal, each of the pulse activities having two or more impulses, consisting of: means of adjusting the signals for receiving said input signal and generating therefrom an adjusted input signal having voltage levels within a predetermined voltage scale; many analog-to-digital converters to value-by our said input signal adjusted to generate digital values representative of the same; first comparator means is for comparing said adjusted input signal and a first threshold voltage quantity to generate a first activity signal each time that the first pulse appearing on said adjusted input signal has a voltage magnitude which exceeds said first threshold voltage magnitude, the first activity signal having an anterior edge- and a trailing edge stopping a pulse width corresponding to the pulse width of said first impulse; second comparator means for comparing said signal 77 input signal and a second threshold voltage amount to generate a second activity signal each time a second pulse appearing on said adjusted input signal has a voltage magnitude exceeding said second threshold voltage quantity, the second signal having activity a leading edge and a trailing edge defining a pulse width corresponding to the pulse width of said second pulse; graphic display means; and rni croconter means for receiving said digital values and for determining said first limit voltage quantity as a function of a first magnitude of said digital values, and a second threshold voltage quantity as a function of a second magnitude of said digital values, for receiving the first activity signal and the second activity signal, and pair-inspect the presence of both the first activity signal and the second activity signal, calculating said microcontroller means the activity time of the impulse activity as a function of the presence of the first activity signal and the second activity signal, and transmitting said activity time to such graphic display means for its deployment.

2. A system according to claim 1, further characterized in that said microcontroller means coordinates one or more chronographs to measure the activity time for an impulse activity upon receiving the first activity signal and the second activity signal, each having? N anterior edge and a posterior edge.

3. A system according to claim 2, further characterized in that before the activity time, said initial microcontroller hoists a first chronograph to an inactive state, a second chronograph to an inactive state, having to occur a first interruption to receive the leading edge of a first activity signal, and a second interruption occurring upon receiving the leading edge of a second activity signal.

4. A system in accordance with the rei indication 3, further characterized in that upon receiving said first interruption indicating the reception of the leading edge of a first activity signal, said microcontroller causes said first interruption to occur at the trailing edge of a first sign of activity; if a second chronograph is not active, said microcontroller fi es said second interruption that is to occur upon receiving the leading edge of a second activity signal, and reloads and operates said second chronograph; and if said second chronograph is active, said controller determines a record of elapsed time as the activity time for the pulse activity and reloads and operates said second chronograph.

5. A system according to claim 4, further characterized in that upon receiving said interrupt indicating the receipt of the trailing edge of a first activity signal, said controller reloads and operates said first chronometer, said first chronograph determining the end of the impulse activity by means of of counting reversively from a predetermined amount of time and causing an interruption of the first chronograph to occur when said first chronograph counts down to zero.

6. A system in accordance with the claim5, further characterized in that, upon receiving said second interruption indicating receipt of an anterior edge- from a second activity signal, if said second chronograph is active, said controller updates the transcribed time record with said second chronograph. ? .- A system in accordance with the claim 6, further characterized in that, upon receiving said interruption of the first chronograph, said micro-controller means fixes said first interruption so that it occurs upon receiving the leading edge of a first activity signal, which stops said first chronograph. 8. A system according to claim 7 and further comprising a memory unit for storing the activity time of the driving activities. 9. A system in accordance with the claim 13, further characterized in that said microcontroller calculates a mean value of activity time during a specific time from the activity time values in said memory unit and transmits said average value of the activity time to said deployment means. for its deployment. 10. A system in accordance with the claim 1, further characterized in that said first pulse is a base pulse of the pulse activity, and said second pulse is a counter-pulse of rupture of the pulse activity. 11. A system according to claim i and further comprising means of entry for the user operatively connected to said micro-media with a router to specify the input parameters including deployment functional modes. 12. A system according to claim i and further comprising a filtering means by operatively connecting said first comparator means to said controller means to filter the first activity signal before transmitting said first activity signal to said microcontroller means. r-o1ador 13. A system according to claim 1 and further comprising a filtering means operatively connecting said second comparator means to said controller means to fx the second activity signal before transmitting said second activity signal to said half micro control dor. 14. A system in accordance with the claim 1 including a first Schmitt trigger means by operatively connecting said first comparator means to said micro controller means to sharpen the edge of the first activity signal before passing the first activity signal to said micro controller means. 15. A system in accordance with the claim L4 further including a second trigger means Schrnitt operatively connecting said second comparator means to said microcontroller means to sharpen the edge of the second activity signal before transmitting the second activity signal to said microcontroller means. 16. A system according to the rei indication 1, further characterized in that said signal adjustment means includes circuit systems for protection of the circuits to prevent said input signal from damaging the system. 17.- A system in accordance with the rei indication i and that also includes a memory unit to store the activity time of the impulse activities. 18. A method for detecting, calculating and displaying the activity time of the variable duration impulse activities that appear in an input signal, each of the impulse activities having two or more impulses, counting the steps of: a) receiving and adjusting said input signal to a predefined voltage setting; b) value per sample said input signal adjusted to generate digital values representative thereof; c) determining from said digital values a first threshold voltage quantity and a second threshold voltage quantity having predetermined relationships with particular characteristics of said input signal; d) comparing said adjusted input signal and said first threshold voltage quantity and generating a first activity signal each time said adjusted input signal exceeds said first threshold voltage quantity, and comparing said adjusted input signal and said second threshold voltage magnitude for generating a second activity signal each time said adjusted input signal exceeds said second threshold voltage quantity; e) measuring the time of activity of an impulse activity with fusion of the time of the presence of the first activity signal and the second activity signal; and f) take off the activity time. 19. A method according to claim 18, further characterized in that said first activity signal and said second activity signal each have a leading edge and a trailing edge and said step (e) further includes the steps of: i ) initialize a first interruption that must occur when receiving the leading edge of a first activity signal, and a second interruption that must occur when receiving the leading edge of a second activity signal, and put a first chronograph and a second chronograph in inactive states; n) upon receiving the first interruption, which indicates the reception of the leading edge of a first activity signal, putting said first interruption so that it occurs when receiving the trailing edge of a first 2R signal activity, if said second chronograph is not active, put said second interruption so that it occurs upon receiving the trailing edge of a second activity signal, and reload and make-operate said second chronograph, and if said second chronograph is active , storing an elapsed time log as the uptime for the pulse activity, and reloading and operating said second chronograph; ip) upon receiving a first interrupt, indicating receipt of the trailing edge of a first activity signal, reloading and operating the first chronograph to point backward from a preset amount of time, causing said first chronograph that a first interruption of the chronograph occurs when said first chronograph counts down to zero; iv) upon receiving said second interruption, which indicates the reception of a leading edge of a second activity signal, if said second chronograph is active, upon toning said elapsed time record with the time value of said second chronograph; v) upon receiving a first interruption of the chronograph indicating the end of time on said first chronograph, placing said first interruption so that it occurs upon receiving the leading edge of a first signal of activity and stopping said first chronograph; and vi) repeat-said steps n) - v) during a selectable period.