FR2778739A1 - DEVICE AND METHOD FOR REMOVING AND / OR DISPLAYING DISTURBANCES IN THE OPERATION OF AN ENGINE - Google Patents

Abstract

A signal SM representing a measurement window is formed as a function of a predetermined TR mark and a predetermined edge of the phase signal. An ignition-synchronous phase signal (SZDG) and a correlated phase signal are generated. (SKOR) and we put in relation the signals (STR), (SM), (SZDG) and (SKOR) so that from the signal (SKOR), we recognize the reference frame and by exploitation of plausibility, we recognizes a fault or a synchronization fault.

Description

I State of the Art The present invention relates to a method and a

  device for eliminating and / or displaying disturbances by

  recognition of benchmarks of a vehicle

  tomobile according to which a crankshaft sensor signal with a large number of regular pulses and at least one reference mark formed by the suppression of a pulse and a camshaft phase signal are linked

  to unequivocally recognize the reference frame

  and after recognition of the reference frame, we

  forms from this reference, the TR signals depending on the name-

number of cylinders.

  To determine the position of the piston of a cylinder

  dre of an internal combustion engine, it is usual to de-

  finish both the position of the crankshaft and that of

  the engine camshaft and this continuously. By-

  so many such angular positions, one can get the posi-

  respective tion of a piston. Usually the crankshaft and

  the camshaft has phonic wheels whose over-

  face is provided with a predetermined number of angular markers

  res. The tone wheels are detected using fixed sensors. These sensors provide an output signal processed by the internal combustion engine control unit

  to determine the angular position and form the pulses

  control elements for ignition and injection.

  The tone wheel associated with the crankshaft usually has a large number of marks of the same type with at least one missing mark (interval) serving as reference mark. In an internal combustion engine work cycle, the crankshaft rotates twice and the camshaft once. The crankshaft reference mark thus passes twice. The arrangement of the phonic wheel of the crankshaft and that of the camshaft is nevertheless such that when the reference mark arrives in the signal from the crankshaft sensor, the signal from the camshaft is at the high level.

  and the other at the low level. This allows a syn-

  unequivocal timing, i.e. associating the signal from the crankshaft sensor with the signal from the shaft sensor

  cams and get the piston position. But as, the angular position of the crankshaft and that of the camshaft are essential for the regu-

  With the internal combustion engine, it is known to examine the plausibility of the signals from the crankshaft sensor and those from the camshaft sensor. Document DE-OS 33 07 833 describes a device making it possible to display and / or memorize errors in detecting the angular position of the crankshaft and the camshaft. In this known device, the construction of which corresponds to

  essentially to that described above, in case of deviation from a prescribed order and from the prescribed intervals of the camshaft signal and the crankshaft signal, an error signal is generated and we save it.

  This allows you to know if there is an error and to detect if an error occurs occasionally or frequently. On the other hand, this document does not indicate the elimination of the error when entering the angular position of the crankshaft or

  from the camshaft or from entering the reference marks.

  Advantages of the invention The present invention relates to a device and a method of the type defined above, characterized in that: - a signal SM is formed representing a measurement window in

  function of a predetermined TR mark and a predefined flank

  phase signal finished, - a synchronous phase signal on ignition (SZDG) and a correlated phase signal (SKOR) are generated and the signals (STR), (SM), (SZDG) and (SKOR) so that from the (SKOR) signal, we recognize the

  reference and by exploiting plausibility, we recognize

  a defect or a synchronization defect arises.

  This process and device allow elimination

  reliable disruption to the detection of benchmarks in motor vehicles with where appropriate

  plus fault recognition and display.

  Thus, according to the invention, the disturbances are eliminated.

  bations and detecting faults by forming other signals from those supplied by the crankshaft sensor and the camshaft sensor by forming a signal TR on the one hand

  specific to the cylinder which is used with a predefined side

  signal of the camshaft ends to form a measurement window and on the other hand, a synchronous phase signal is generated at ignition and a correlation phase signal and, starting from these signals, the mark is detected reference and a plausibility check is carried out to display the fault. The synchronous phase signal on ignition and its

  correlation is generated each time by starting a ge-

virtual phase generator.

  According to other advantageous characteristics of the invention: - the signal from the crankshaft sensor and that from

  the camshaft phase as well as the formation of

  (STR), (SM), (SZDG) and (SKOR) in the computer of the internal combustion engine control unit which also defines the control signals necessary for the regulation of the internal combustion engine for the image and / or injection, - the synchronous phase signal on ignition (SZDG) and the correlated phase signal (SKOR) are formed by starting a synchronous virtual phase generator on ignition and a virtual phase generator in correlation by the calculation installation of the control device and, - the signals thus generated are processed by reversing the signal of the synchronous virtual phase generator at ignition on arrival of the first reference point TR after the reference point of the crankshaft signal and the signal of the

  virtual phase generator correlated by a decen-

  by the negative flank of the interruption of the genera-

  released phase - the introduction is only done inside a window of

  measurement correlated by the viral phase generator

  synchronous ignition and we reset the

  TR mark which was set after the arrival of the reference mark

  rence, - the measurement window is fixed to start on the mark

  TR before the reference mark of the signal from the speed sensor

  lebrequin and end as soon as possible in the interruption of the phase generator on the negative flank of the phase generator at the latest on the TR reference which follows,

  - for each TR mark after the reference mark, we de-

  shuts the signal (SKOR) in the shift register and uses it for the diagnosis of the phase generator and the

synchronization monitoring.

  It is particularly advantageous to be able to

  continue to use existing facilities for re-

  knowledge of the reference mark or of the angular position of the crankshaft or the camshaft by performing

  additional signal processing.

Drawings

  An exemplary embodiment of the invention is shown

  presented in the drawings and will be described below in more detail. So,

  - Figure 1 shows an already known sensor device ap-

  plied to an internal combustion engine providing the

  necessary for the invention, - Figures 2 to 4 are timing diagrams corresponding to the method and the device according to the invention in the case of undisturbed operation, in the case of disturbances

  EMV and in the event of a synchronization fault.

Description

  Figure 1 shows schematically the components

  of an internal combustion engine necessary for the description

  of the invention. The device of FIG. 1 is for example

  known according to document DE-OS 195 212 77.

  In detail according to Figure 1, a disc

  phonic 10 is integrally connected to the crankshaft 11 of the mo-

  internal combustion tor and its periphery has a large number of angular references 12 of the same type. Next to these similar angular references 12 having the same distance A1, there is a reference reference 13 constituted for example by the

  deletion of two angular marks leading to an in-

angular tervalle A2, enlarged.

  The camshaft of the internal combustion engine bears the reference 15. It is driven in a known manner by the crankshaft 11. The drive is shown diagrammatically by the line of

  link 17. In a sign of engine operation, the

  the crankshaft turns twice and the camshaft once. A phonic disc 14 is connected to the camshaft 15. This disc has for example an angular mark 16. The phonic disc 10 is detected by the crankshaft sensor

  18 and the sound disc 14 by the crankshaft sensor 19.

  The crankshaft sensor 18 also called the speed sensor

  of rotation of the crankshaft provides the signal Si = SKW represented

  sensed in Figures 2 to 4. The camshaft sensor also called camshaft phase sensor provides the signal S2 = SNW. The arrangement of the sound records is such that

  the signals Si, S2 occur so that the reference mark

  rence (interval) of the signal Sl corresponds to a rotation of the crankshaft when the signal S2 is in phase or in the state

  low. While the rotation of the crankshaft also

  responds to the phase or high level of signal S2.

  The processing of signals S1, S2 as well as

  all the processing is done in the

  command 20 of the internal combustion engine. The com-

  mande 20 receives the different sizes by different inputs

  necessary for control and regulation, measured quantities

  rees by the various sensors 21 not shown here.

  Input 22 receives an ignition signal supplied by the farmer

  ignition switch 23, via terminal K115 of the ignition contact. At the output, the control device 20 which

  includes computing and memory means 24, 25 not defined

  cut, ignition and injection signals supplied to non-detailed components of the internal combustion engine. These signals appear on outputs 26, 27 of the

  control 20. The power supply to the control unit

  Mande 20 is provided in the usual way from the bat-

  rie 28 via a switch 29.

  The arrangement described in Figure 1 allows to realize the device and the method according to the invention for

  eliminate and / or display disturbances in the recognition

  of the reference mark. To do this, the signals are processed or formed in the following manner in the control unit. From the timing diagrams of the signals Si, S2, the control device or the computer of this device recognizes the reference mark and forms from there, the marks TR designated as signal S3 = STR. The TR mark is set when the BZM mark has been recognized as well as the predetermined signal level of the S2 signal (low level). The TR mark is set with the second rising edge of the signal Si after the reference mark. After the first reference frame TR associated for example with the cylinder Zyl.1, for each cylinder we form

  other TR marks and the angular interval between marks

  res TR is equal to the angle of rotation of the crankshaft divided by the number of cylinders, or 720 / number of cylinders. The

  formation of the first reference frame TR corresponds to the synchronization

  tion. By synchronization, we recognize the reference frame

  rence (interval) of the crankshaft signal S1 and taking into account the signal S2 (signal from the camshaft phase sensor) the vector of the cylinder is adjusted. We then start a virtual phase generator, synchronous on ignition as well as a phase generator correlated virtually; these

  phase generators should be considered as par-

  program parts of the control unit ECU.

  The virtual phase generator, synchronous at ignition as well as the correlated virtual phase generator, in principle provide a signal which corresponds to the signal from the camshaft phase generator S2. The two signals will however be processed as described below to give the signals S5 = SZDG and S6 = SKOR. The signal from the virtual phase generator, synchronous on ignition is inverted every

  times on the TR mark after the reference mark (inter-

  valley of the crankshaft teeth). The chronogram obtained cor-

corresponds to line S5.

  The signal from the virtual phase generator, corrected

  lé is set to the state by the triggering of the negative edge of the interrupt releasing the phase generator; status reset is only possible with a correlated measurement window on S5. The reset is done on the TR mark

  which appears after the reference mark of the signal Si (in-

  tervalle of teeth of the crankshaft). The measurement window re-

  presented as signal S4 = SM, begins each time on the reference frame TR before the reference frame of the crankshaft signal S1, when the reference frame is awaited by S5. The measurement window ends as soon as possible with the interrupt

  of the phase generator, i.e. at the level of the

  gative of the phase generator signal S2 and at the latest

next TR level.

  At the arrival of each TR mark, after the mark

  of reference, signal S6 is pushed into a register at

  timing implemented in the computer 25 of the

  ordered. This shift register is used in the diag-

  phase generator and synchronization monitoring. In the case of undisturbed operation such

  as shown in figure 2, the content of the decimal register

  the age changes each time for certain TR marks; in the embodiment shown in FIG. 2 of an eight-cylinder engine, the alternation occurs on cylinder 1 and on cylinder 6 spaced apart by a crankshaft angle of 360. Figure 3 gives an example of disturbances

  EMV. In the event of an operational situation tainted by

  EMV turbations, the output signal from the camshaft sensor

  mes may be disturbed and not suitable for prosecution

  signal processing. As the story suggests

  naked from the shift register, it is nevertheless possible to carry out recognition of reference marks because the

  combination of signals S3 (TR marks) S4 (measurement window

  sure) S5 (SZDG) and S6 (SKOR), which are trained with the means

  described in relation to Figure 2, leads to the cor-

  rect of the shift register. The S5 signal changes each time

  at the TR marks which arrive after the reference mark

  As the crankshaft sensor signal reference, the S4 measurement window includes only one pulse which occurs before the reference mark of the crankshaft sensor signal arrives. This pulse produces a switching of the level of the signal S6 which is again switched from the high level to the low level by the reference mark TR of the cylinder 1. Thus, even without the camshaft sensor signal S2 or without the camshaft signal S2 can be used, a recon-

  birth of benchmarks.

  Figure 4 shows the workflow

  in case of synchronization error. Signal S5 is at ni-

  high calf when the first TR mark occurs to be

  thus switched to the low level and remains at the low level until

  on arrival of the TR mark of cylinder 6. The signal S5 again goes high with this TR mark. The signal from the measurement window S4 is switched before the reference mark of the crankshaft sensor signal, from low level to high level and after the arrival of the reference mark, the following TR mark returns the signal to low level. These two timing diagrams

  S4, S5 give the virtual phase signal S6, in correlation

  tion, as shown in Figure 4; for this signal, S6

  stays permanently low. This is why, the regis-

  be shift always contains the value zero and during an error recognition, this value which remains unchanged in the shift register, allows to conclude a synchronization fault and start a new synchronization

  or display a fault and shut down the system.

  The process described above, which results in the chr-

  nogram of the various states represented in FIGS. 2 to 4, makes it possible to perform recognition of reference marks which can nevertheless continue to operate for certain disturbances and which, in the event of continued disturbances

  or synchronization error, triggers a cor-

respondent.

Claims (4)

R E V E N D I C A T I ON S   1) Method for eliminating and / or displaying disturbances by recognizing reference marks of a motor vehicle according to which, a crankshaft sensor signal with a large number of regular pulses and at least one reference mark formed by the suppression of a pulse and a camshaft phase signal are linked   to unequivocally recognize the reference frame   and after recognition of the reference frame, we   forms from this reference, the TR signals depending on the name-   number of cylinders, characterized in that - a signal SM is formed representing a measurement window in   function of a predetermined TR mark and a predefined flank   phase signal finished, - a synchronous phase signal on ignition (SZDG) and a correlated phase signal (SKOR) are generated and the signals (STR), (SM), (SZDG) and (SKOR) so that from the (SKOR) signal, we recognize the   reference and by exploiting plausibility, we recognize   nalt a fault or a fault of synchronization.   2) Method according to claim 1, characterized in that the signal from the crankshaft sensor and that of   the camshaft phase as well as the formation of   (STR), (SM), (SZDG) and (SKOR) in the   the internal combustion engine control unit which   also ends the control signals needed to reset   internal combustion engine control for image and / or injection.   3) Method according to any one of claims 1 and 2,   characterized in that - the synchronous ignition phase signal (SZDG) and the correlated phase signal (SKOR) are formed by starting a synchronous ignition phase generator and a correlated virtual phase generator by the installation for calculating the control device and, - the signals thus generated are processed by reversing the signal from the synchronous virtual phase generator on ignition on arrival of the first mark TR after the reference mark of the signal of crankshaft and the signal of the   virtual phase generator correlated by a decen-   by the negative flank of the interruption of the genera-   released phase - the introduction is only done inside a window of   measurement correlated by the viral phase generator   synchronous ignition and we reset the   TR mark which was set after the arrival of the reference mark   rence. 4) Method according to claim 3, characterized in that the measurement window is fixed to start on the mark   TR before the reference mark of the signal from the city sensor   brequin and end as soon as possible in the interruption of the   phase generator on the negative side of the generator   phases at the latest on the following TR reference.    ) Method according to claim 4, characterized in that for each TR mark after the reference mark, the signal (SKOR) is shifted in the shift register and used for the diagnosis of the phase generator and the monitoring synchronization.   6) Device for implementing the method according to one   any of claims 1 to 5,   characterized in that it comprises means for forming a signal representing a measurement window as a function of a predetermined mark and a predetermined flank of the phase signal, - means for generating a phase signal, synchronous with the ignition and a correlated phase signal and a means II] to relate the signals (STR), (SM), (SZDG) (SKOR) to recognize the reference frame and a means   to exploit plausibility to recognize to recognize create a fault.