Method of correction of angular error of absolute angular position sensor

FIELD: methods of correction of angular error of absolute angular position sensor recording angular position of first shaft whose rotary motion is interrelated with rotation of second shaft.

SUBSTANCE: proposed method may be used for determination of angular position of internal combustion engine camshaft. Angular position sensor is just absolute angular position sensor. First angular position of second shaft is recorded during complete revolution of first shaft and angular position of first shaft is determined on basis of measurement. Then, respective output magnitude of absolute angular position sensor is compared with respective angular position of first shaft at retained misalignment obtained in the course of comparison. Then, each output magnitude of absolute angular position sensor is corrected for respective retained magnitude.

EFFECT: possibility of compensating angular error of absolute angular position sensor.

4 cl, 4 dwg

 

The present invention relates to a method of correction of the angular error of the sensor absolute angular position, recording the angular position of the first shaft, the rotary motion of which is connected with the rotation of the second shaft.

This method is used primarily for determining the angular position of a shaft of the internal combustion engine (ice). So nizheprilagaemuyu in the invention method is considered as an example with respect to ice.

In order to ensure reliable operation of modern engine management systems must continuously be registered with high accuracy rotational speed and angular position of the crankshaft and camshafts. To determine the frequency of rotation of the crankshaft, as is known, apply a pulse sensor with a rotating synchronously with a crankshaft gear drive, which has sixty-minus two angular marks and which is scanned by the specified sensor. As such a sensor typically use an inductive sensor, a magnetoresistive sensor or a Hall sensor.

To obtain complete information about the current working cycle of the engine is necessary to determine the absolute angular position of the camshaft.

In modern systems, engine management ug the TV position of the camshaft is logged prosegment. For this purpose, use a special disk that rotates synchronously with the camshaft and has, for example, the four corner marks and which is scanned by the corresponding sensor. Level issued from the sensor output signal is changed several times during one revolution of the camshaft. In this way accurate information about the current angular position of the camshaft can only get during the passage past the sensor of the boundaries between segments, i.e. during the passage past the sensor of those parts of the disk, where it changes the level of the output signal of this sensor. In the angular interval between the boundaries between segments information about the exact angular position of the shaft is missing.

Continuous determination of the angular position of a shaft enables optimized engine management system, because the control unit in this case at any time there is information about the current angular position of the shaft. Thus, there is a possibility to increase the reliability of the existing engine control systems and, if necessary, to extend the functionality of such systems.

For example, a continuous determination of the angular position of a shaft allows you to quickly diagnose the speed sensor or even quickly and with anicello easy to diagnose directly probe the absolute angular position, putting the control on the accuracy of its signal. In addition there is the ability to reliably and relatively easy to determine the angular position of the camshaft at the time of engine start. It also creates an opportunity with high reliability to determine the time of the stop or kill the engine and reduce the frequency of rotation of the shaft below the nominal, to determine the direction of rotation and speed up the synchronization of the processes occurring when the engine is started, with the aim to ease the start of the engine. In addition, it becomes possible to improve the operation of the engine failure speed sensor and directly start the engine only using sensor absolute angular position.

From the application DE 19722016 A1 is known a sensor absolute angular position, which allows you to continuously determine the angular position of the camshaft. The operation of this known sensor absolute angular position based on a combination of Hall effect and magnetoresistive effect. To this end, in this known sensor absolute angular position are two of the sensing element, one of which is based on the Hall effect, and another on the magnetoresistive effect. Issued both sensor signals are combined with each other.

Such known the th sensor of the absolute angular position allows you to determine the angular position of the camshaft with the results of measurements, which is only slightly dependent on temperature and pressure, and at the same time with high resolution. This gauge allows you to accurately determine the angular position throughout the range of changes of angle equal to 360°, so you can use it to measure the absolute angular position of a shaft of the engine.

Despite the fact that using this known sensor absolute angular position, you can create the engine management system, which provides a more easy and quick start of the engine, thereby reducing the load on the battery, starter and generator and thereby reduce the size of these nodes, and which is due to the reliable recognition of the direction of rotation avoids reverse outbreaks in the intake manifold, which in turn allows, for example, to reduce the technical requirements to the intake pipe and the throttle valve of the engine. The disadvantage of this known sensor, however, is that he is hardly able to provide the required accuracy of determining the angular position of a shaft with an angular error of less than approximately one or two degrees of the angle of rotation of this shaft. This drawback is mainly due to variation in mechanical properties due to errors in the Assembly and installation of the sensor, with the variation of mechanical parameters due to errors in Assembly and installation of the magnet, with the magnetic field inhomogeneity, with the shaft a certain roundness, and with a certain variation of the electrical and mechanical parameters of the detector element.

From the application DE 19750024 A1 known method of compensating errors that occur during installation of gear drive pulse sensor, which initially determine the actual error in the angular positions of at least one label on this toothed disk and at least one label on which is connected with the other shaft of the control or reference toothed disk, after which it the actual variance is compared with a set value of the error and the resulting value, which characterizes the deviation of the actual error from the setpoint mismatch, retain in error of a gear drive pulse sensor. This toothed disk can be connected to the camshaft, and a reference disk with a crankshaft of the engine.

Although this known method and allows to correct the error due to inaccurate mounting of the toothed drive pulse sensor, however this method does not allow to correct error, which is caused by the impact sensor of the absolute angular position of numerous interrelated factors. Thus, in particular, this known method does not allow to correct error, which occurs regardless of the corrected using this method the error of the installation, this error caused by the deviation can be positive or negative.

Based on the foregoing, the present invention was based on the objective to develop a method for correcting the angular error of the sensor of angular position, which would allow almost completely compensate for the angular error of the sensor absolute angular position, with such compensation should be provided in any angular position of the first shaft for full turnover and taking into account all the factors that can lead to errors in the determination of angular position.

This task is solved according to the invention due to the fact that the angular position sensor is an absolute sensor angular position, with the first at least one complete revolution of the first shaft register corresponding to the angular position of the second shaft and on the basis of the obtained measured values determine the corresponding angular position of the first shaft so that the corresponding output value of the sensor absolute angular position is compared with the corresponding angular position of the first shaft is, keeping the value resulting from this comparison of the error, and then each of the calculated respective output values of the sensor absolute angular position adjusted on the corresponding stored value.

According to one preferred options proposed in the invention method repeatedly determine a specific angular positions of the errors, and these errors average, the obtained average values are preserved and used for correction.

Corresponding to a specific angular position error is preferably determined continuously.

Due to the fact that the first at least one complete revolution of the first shaft register corresponding to the angular position of the second shaft and on the basis of the received values to determine the corresponding angular position of the first shaft, creates the opportunity to identify all the errors shown for the full rotation of the shaft. In other words, this approach allows to detect not only errors encountered during the installation of gear drive from the first shaft, and, in addition, all other error in the sensor operation absolute angular position. Thus, in particular, provided according to the invention, the comparison of the corresponding output value of the sensor is absolutely what about the angular position with the respective angular position of the first shaft allows you to identify a mismatch between the actual and the desired angular positions, which, for example, in the beginning made the first full turn of the shaft may have a negative value, and then in the course of further rotation of the shaft to acquire a positive value.

Preserving obtained for each comparison, the value of the error and then correcting each of the respective output values of the sensor absolute angular position corresponding to the stored value, an opportunity to correct the output value of the sensor absolute angular position already on the second turnover of the first shaft. The stored values can be stored in a memory of the control unit and with the engine off, at the next engine start allows you to use these stored values for correcting the output value of the sensor absolute angular position already when making the first shaft of the first turn.

The advantage associated with averaging several values of error is almost completely eliminate the negative impact appears when certain conditions peak values. However, most preferably, as indicated above, to determine the appropriate specific angular positions of the errors continuously, i.e. on each revolution of the shaft.

For the correction of errors in the interval between two discrete meant the s preferable to use the value obtained on the basis of these two values by interpolation. This approach allows you to adjust the output values of the sensor absolute angular position and when the first shaft is in the position in which the sensor is used to determine the angular position of the second shaft does not issue the measuring signal, as, for example, takes place when in front of this sensor is the depression between two teeth of the toothed disk mounted on the second shaft.

Other distinctive features of the present invention is described in more detail below using the example of one specific variants of its implementation with reference to the accompanying drawings on which is shown:

figure 1 - diagram of the device for carrying out the invention method,

figure 2 - diagram of the microcontroller shown in figure 1,

figure 3 - characteristics of the output signal of the sensor absolute angular position and

figure 4 - characteristics of changes amendments to the signal, the characteristic of which is shown in figure 3.

As shown in figure 1, camshaft internal combustion engine 1 includes a probe 2 absolute angular position. On the crankshaft 3 of the internal combustion engine has a sensor 4 angle. Operation of the sensor 2 of the absolute angular position is based on the use of the Hall effect in the combination of the magnetoresistive effect. Sensor 4 angle made in the form of a conventional inductive sensor, passing by him each of the lateral sides of the teeth connected to the crankshaft 3 of the toothed disk 3A emits a corresponding signal.

Output signal 2’ sensor 2 absolute angular position is supplied to the first processing circuit 5. Output signal 4’ of the sensor 4 of the angle of rotation is supplied to the second processing scheme 6. Issued by the first circuit 5 processing the processed signal 2 sensor 2 absolute angular position is fed to the microcontroller 7. Issued by the second circuit 6 processing the processed signal 4’ sensor 4 angle also supplied to the microcontroller 7. The first processing circuit 5, the second scheme 6 processing and the microcontroller 7 are components of the control unit 8.

Then the microcontroller 7, as shown in figure 2, based on the processed output signal 2 sensor 2 absolute angular position, and the processed output signal 4’ sensor 4 angle first in the cascade 9 determines the magnitude of the error between the output signal of the sensor 2 absolute angular position and used as a reference signal the output signal of the sensor 4 angle. Is issued by the first cascade 9 differential signal 9’ enters the storage cascade. Sohraneny is in the memory stage 10 is given forth as an amendment in the form of a corrective signal 10’ in cascade 11 correction. In this cascade of 11 correction is also processed output signal 2' sensor 2 absolute angular position. In this cascade 11 correction processed output signal 2 sensor 2 absolute angular position is adjusted on the learned value of the correction signal 10’. Issued by the cascade 11 correction output signal 11’ largely corresponds to the actual angular position of the camshaft 1.

Figure 3 as an example, shows the characteristic of the processed output signal 2 sensor 2 absolute angular position (DUP) depending on the actual angular position of a shaft (PB) 1. For this comparison as a dashed line shows the characteristic of the output signal of the sensor 2 absolute angular position, which corresponds to the required value of this signal. As shown in figure 3, the variance of the processed output signal 2 sensor 2 absolute angular position is first about plus 30°. In the angular position corresponding to the rotation shaft at an angle of about 150°, the error latch is missing. In the interval from 150° up to about 190° misalignment has a negative value and is approximately minus 30°. In the angular position, it is suitable the rotation shaft at an angle of approximately 290° the mismatch is again reduced to zero, changing the sign to positive, while in the angular position corresponding to one complete turnover of the shaft at an angle of approximately 360°, the error term is again about plus 30°.

Figure 4 shows the characteristic changes of the amendments that are generated in the cascade 11 correction. This amendment is in each moment corresponds to the modulo value of the error output signal of the sensor 2 absolute angular position, but has the opposite sign.

1. Method of correction of the angular error of the sensor (2) angular position, recording the angular position of the first shaft (1), the rotational movement of which is linked to rotation of the second shaft (3), characterized in that the sensor (2) angular position represents the sensor absolute angular position, with the first at least one complete revolution of the first shaft (1) register corresponding to the angular position of the second shaft (3) and based on the obtained measured values to determine the corresponding angular position of the first shaft (1), then the corresponding output value of the sensor (2) absolute angular position is compared with the corresponding angular position of the first shaft (1), keeping the value obtained as a result of this comparison, massoglia the project, and then each of the calculated respective output values of the sensor (2) absolute angular position adjusted on the corresponding stored value.

2. The method according to claim 1, characterized in that repeatedly determine a specific angular positions of the errors, and these errors average, the obtained average values are preserved and used for correction.

3. The method according to claim 2, characterized in that the specific angular position error is determined continuously.

4. The method according to any one of claims 1 to 3, characterized in that for the correction of errors in the interval between two discrete values, use the value obtained on the basis of these two values by interpolation.



 

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FIELD: methods of correction of angular error of absolute angular position sensor recording angular position of first shaft whose rotary motion is interrelated with rotation of second shaft.

SUBSTANCE: proposed method may be used for determination of angular position of internal combustion engine camshaft. Angular position sensor is just absolute angular position sensor. First angular position of second shaft is recorded during complete revolution of first shaft and angular position of first shaft is determined on basis of measurement. Then, respective output magnitude of absolute angular position sensor is compared with respective angular position of first shaft at retained misalignment obtained in the course of comparison. Then, each output magnitude of absolute angular position sensor is corrected for respective retained magnitude.

EFFECT: possibility of compensating angular error of absolute angular position sensor.

4 cl, 4 dwg

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