The method of measuring angular position of a shaft

 

(57) Abstract:

The invention relates to measuring equipment. The technical result is to increase the reliability of the measurements. The method of measuring the angular position of the shaft lies in the fact that a relatively controlled shaft with a drive gear ring evenly spaced teeth and a few missing, place the sensor generating a signal with a known duty cycle, measure and memorize the current repetition period of the signals from the sensor, generate a marker pulse corresponding to the missing teeth, and angular impulses corresponding to the teeth on the disk, and count the number of rotation pulses generated after the marker pulse, and the number of rotation pulses counted to determine the angular position of the controlled shaft; before the formation of the angular impulses produce the selection and rejection of interference pulses, why in front of each sensor signal at the first stage produces a comparison of the constants of the sensor and amendments, taking into account the maximum possible brake controlled shaft, with respect to the previous repetition period to the current repetition period, the pulse interference is determined either on the ground e is a corresponding repetition period of the sensor signal to the current repetition period of the sensor signal is less than the constant. 5 Il.

The invention relates to measurement techniques, in particular, to the measurement of the angular position of the shaft of the internal combustion engine (ice) with an electronic digital control system.

There is a method of measuring angular position of a shaft of ice (ed. St. USSR N 917708, CL F 02 P 5/08, 1982), namely, that place two pulse sensor relative to the controlled rotating shaft, provided with a disk with a ring gear and a single marker tooth, and the first sensor is placed over the crown, with evenly cut teeth, and the second sensor over a single marker tooth. The measurement of the angular position is produced by counting rotation pulses generated by the first sensor relative to the reference pulse generated by the second sensor.

This method is cumbersome, as it requires two sensors and a corresponding number of links and shapers signals. In addition, this method has a low immunity in terms of impulse noise, such as ignition system of internal combustion engine that causes a failure in the operation of the control system of the engine.

The prototype was taken the way of measuring the angular position of the shaft of the internal combustion engine (ed. St. USSR N 1728642, CL G Nobunaga disk with a ring gear, with evenly cut teeth, and several teeth missing. During the rotation of the shaft sensor generates pulses corresponding to the passage past him to the teeth of the drive controlled shaft. By measuring the current period pulse generated by the sensor, and comparing it with the previous period pulses produce a marker pulse and calculate the angular momenta relative to the marker pulse.

This method also has a low immunity in terms of impulse noise, such as ignition system of the engine.

The technical result of the invention is to increase reliability of measurement angular position of the shaft in terms of impulse noise, such as ignition system of the engine.

This result is achieved in that in the method of measuring the angular position of the shaft, namely, that relatively controlled shaft, provided with a drive gear ring having evenly spaced teeth and a few missed, place the sensor, generating moving during rotation of the shaft tooth signals with a known duty cycle, measure and memorize the current repetition period of the signal of the sensor, form the matter of the teeth on the drive controlled shaft, count the number of rotation pulses generated after the marker pulse is generated after the marker pulse, determine the angular position of the controlled shaft before the formation of angular momenta, make the selection and rejection of interference pulses, for which the front of each sensor signal to the first stage produces a comparison of the constant, which represents the sum of the values of the duty cycle of the signals of the sensor and amendments, taking into account the brake controlled shaft, with respect to the previous repetition period to the current repetition period and pulse interference is determined either at the first stage, if you read zero logic level signal or the second phase, if the ratio of the previous repetition period of the sensor signal to the current repetition period of the sensor signal is less than the constant.

In Fig. 1 shows a structural diagram of a device that implements the inventive method. In Fig. 2 the waveform of the voltage at the output of the shaper sensor signal in the absence of impulse noise. In Fig. 3, the waveform of the voltage at the output of shaper sensor signal in the case of overlapping impulse noise at low signal level. Fig what drove sensor. In Fig. 5 is a structural diagram of the algorithm processing interrupt edge of the sensor signal.

Symbols accepted on the waveform:

Tpprevious memorized the repetition period of the sensor signal;

Tmthe current measured repetition period of the sensor signal;

U the duration of the high signal level,

Upthe pulse duration of the interference.

Duty cycle is defined as the ratio of the repetition period of the signal of the sensor to the duration of the high level signal.

The device for its implementation includes installed on the monitored shaft disk 1 with 58 teeth and two missing, the sensor 2, is placed above the notched disk 1 and connected to the shaper 3 signals of the sensor. The output of the shaper 3 signal sensor connected to the input of an external interrupt of the microprocessor 4, which in turn is connected with the storage device 5, in which is stored a program interrupt. The microprocessor 4 has an output, which displays information about the angular position of the controlled shaft.

The method can be implemented as follows. Place the pulse sensor on a ring gear rigidly connected with the con is th the crown may have, for example, 58 and two missing teeth. In front of the sensor signal to produce a delay time exceeding the duration of the impulse noise, for example, by using a delay line or a timer, and then reads the logic level of the sensor signal.

If the read level is a logical zero, the sensor signal was considered as an obstacle. The impulse noise no action is produced and go into standby mode, the next sensor signal. If you read the logic level is a logic one, then measure the distance between sensor signals, for example, by counting the time from the appearance of the front of this signal, until the front of the next signal the number of pulses of the master oscillator. Make memorizing calculated number of pulses of the master oscillator, for example, in the counter register or the cell random access memory (RAM). Calculate the ratio of the current period following the signals from the sensor to the memory of the previous one. This can be done by dividing the current repetition period in the previous memorized the period, for example, in the arithmetic-logical unit (ALU) or a microprocessor. Make a comparison of the obtained amalina possible braking of the shaft. If the resulting ratio is less than the specified constant, then consider this signal interference, induced, for example, from the ignition system of internal combustion engines, further processing of the stop signal, the measured period not remember and go into standby mode, the next sensor signal. If obtained more of the above constants, the sensor signal is considered valid signal and produce the further development of a marker and/or angular momenta. The formation of the marker pulse is produced, for example, when more than twofold excess of the current repetition period of the signal of the sensor over the previous memorized period. The formation of angular pulses are produced, for example, for each actual sensor signal. Calculate angular momenta, since the formation of the marker pulse, for example, using a software counter, made on the basis of the register cell of RAM or a separate chip. For each angular momentum is produced by which the counter increments, and for each marker pulse produce counter. The number counted by the counter rotation pulses in a given time will indicate the current angular floor shall demonstrate the method was implemented in software in the controller of the control system of internal combustion engines of VAZ-2110.

A device that implements the method works as follows. When the rotation shaft moves the teeth and troughs in front of the sensor 2, which generates the signals. The driver signals of the sensor 3 converts the signals from the sensor 2 in the form acceptable to the microprocessor 4. The pulses from the shaper's output signals of the sensor 3 is fed to the input of an external interrupt of the microprocessor 4.

In the process of generation of pulses by the sensor 2 and transfer them to the shaper 3 sensor signals can be superimposed interference pulses, for example, from the ignition system of internal combustion engines, and thus to the interrupt input of the microprocessor will receive the signal representing the sum of the sensor signals and interference. On the front of this signal, the microprocessor, for example, Siemens 80517, interrupts the main program for processing external interrupts.

The algorithm of processing of this interrupt is shown in Fig. 5 shows the processing steps of the sensor signal by the proposed method. For measuring the repetition period of the sensor signal from the front to the front uses a timer device microprocessor. In this example, the software implementation is not shown, the block in which is formed a marker pulse. the ka with double the previous period, because the marker label (skip two teeth) corresponds to double the repetition period of the signal of the sensor when passing in front of him missing teeth. At the beginning of the algorithm is the delay time characteristic of impulse noise (of the order of several microseconds). The delay may be performed using a counter-timer or run empty commands (NOP commands). After a delay checks the signal level at the input of the interrupt. If the signal level at the input is low, this means that the interrupt was not valid from the sensor signal, and interference from, this is the output of the interrupt processing without storing the current period. If the signal level is high, then calculates the ratio of the previous preset period of Tpto the current measured Tmand compared with a constant (Q + dQ), and if the ratio is smaller, it means that an interrupt has occurred from interference, while the program exits the interrupt processing without storing the current period. The opposite case means that an interrupt has occurred from the actual pulse. Thus remembered the current measured period signal and increments a software counter. After e is the crown. If the number of pulses does not exceed the number of teeth, the normal exit from interrupt. If the counter exceeds the number of teeth, it generates an error message and resynchronization, i.e., the transition to a subroutine initial finding of marker tags (formation marker pulse).

The method of measuring the angular position of the shaft, namely, that relatively controlled shaft, provided with a drive gear ring having evenly spaced teeth and a few missed, place the sensor, generating moving during rotation of the shaft tooth signal with a known duty cycle, measure and memorize the current repetition period of the signals from the sensor, generate a marker pulse corresponding to the missing teeth on the controlled shaft, and the angular momenta corresponding to the teeth on the drive controlled shaft, count the number of rotation pulses generated after the marker pulse, and the number of rotation pulses counted to determine the angular position of the controlled shaft, characterized in that prior to formation of the angular impulses produce selection and discarding noise pulse,provides a sum of the values of the duty cycle of the signals of the sensor and amendments considering the brake controlled shaft, with respect to the previous repetition period to the current repetition period and pulse interference is determined either at the first stage, if you read zero logic level signal or the second phase, if the ratio of the previous repetition period of the sensor signal to the current repetition period of the sensor signal is less than the constant.

 

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