KR100563350B1 - Processing method for signal of rotation number - Google Patents

Abstract

The present invention enables the calculation of the rotational speed based on the rotational speed signal to be executed accurately and stably without the influence of the noise signal, and is affected by the first rotational signal S1 and the noise signal, which are less susceptible to the noise signal. Since the rotation speed is determined using the easy second rotation speed signal S2, the interrupt permission period X1 for each of the first and second rotation speed signals S1, S2 based on the rotation speed calculated from the first rotation speed signal S1. , X2,… YA1, YB1,... Set. Then, using the edge timings of the first pulses generated within these interrupt permission periods as normal interrupt timings, the rotation speeds of the first and second rotational speed signals S1 and S2 are calculated based on the obtained interrupt timing.

Description

PROCESSING METHOD FOR SIGNAL OF ROTATION NUMBER}             

1 is a timing chart showing a method of processing a rotational speed signal according to the present invention;

2 is a flowchart showing a processing program for processing a first rotational speed signal;

3 is a flowchart showing a processing program for processing a second rotational speed signal;

Explanation of symbols for the main parts of the drawings

A (n), B (n), C (n): Interrupt permission period

PA1, PA2, PB1 to PB5: pulse

S1: first rotation speed signal

S2: second revolution signal

X1, X2, YA1, YB1, YA2, YB2, YA3: Interrupt permission period

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of processing a rotation speed signal for processing the rotation speed signal output from the rotation sensor in accordance with the rotation speed of various rotating apparatuses such as an engine so as to accurately detect the rotation speed.

For example, in a vehicular device or the like, in order to detect the rotational speed in a rotating device other than the engine, a rotational sensor is attached to the required rotating device, and a pulse signal whose cycle changes depending on the rotational speed of the rotating device is rotated from the rotating sensor. The rotation speed of the rotating device is determined by outputting as a number signal and electrically detecting the period of the rotation speed signal. Conventionally, although the time interval between the rising edge or the falling edge of each pulse of the above-mentioned rotational speed signal is measured and the rotational speed is determined based on the measured time interval, the noise signal generated from each vehicle device, For example, if the pulse-shaped signal is superimposed on the rotational speed signal by the influence of ignition noise, accurate rotational speed detection cannot be performed. For this reason, for example, in Patent Literature 1, a determination section including a normal pulse portion of the rotation speed signal is provided, and only the edge of the pulse input in the determination section is detected as the engine speed signal for the rotation speed detection. The configuration is disclosed.

[Patent Document 1] Japanese Patent Application Laid-Open No. 7-54703

However, according to the above-described conventional method, the influence of the noise signal outside the determination section can be eliminated, but the problem that the necessary detection operation is confused by the noise signal mixed in the determination section and the detection becomes unstable is solved at least. It is not supposed to be.

An object of the present invention is to provide a method for processing a rotational speed signal that can solve the above-described problem in the prior art.

A feature of the present invention for solving the above problems is the rotation speed is determined by using a first rotational speed signal, which is less susceptible to the noise signal output as a pulse signal, and a second rotational signal that is susceptible to the noise signal, respectively. A method of processing a rotational speed signal, comprising: a calculation step of calculating a rotational speed based on the first rotational speed signal, and to each of the first and second rotational speed signals based on a calculation result obtained in the calculation step. Setting an interrupt permission period with respect to each other; a timing processing step of processing the edge of the first pulse occurring within the interrupt permission period as regular interrupt timing; and based on the interrupt timing obtained in the timing processing step, Calculating a rotational speed for each of the second rotational speed signals The call processing method is proposed.

EMBODIMENT OF THE INVENTION Hereinafter, an example of embodiment of this invention is described in detail with reference to drawings.

1 is a timing chart showing a method of processing a rotational speed signal according to the present invention. In Fig. 1, (a) is a signal waveform diagram of a first rotational speed signal S1 from a first rotational sensor provided in a housing of a pump for supplying fuel to an internal combustion engine, and (c) is located near an output shaft on the side of the internal combustion engine. It is a signal waveform diagram of the 2nd rotation speed signal S2 from a 2nd rotation sensor. Therefore, the first rotation sensor has a relatively small influence on the noise signal, and the second rotation sensor has a relatively large influence on the noise signal. For this reason, compared with the noise signal superimposed on the 1st rotation speed signal S1, on the condition that there are many noise signals superimposed on the 2nd rotation speed signal S2.

The first rotation speed signal S1 and the second rotation speed signal S2 are transmitted to the microcomputer, and the rotation speed is calculated by measuring the time between predetermined edge timings of each signal pulse. Here, each pulse of the first rotational speed signal S1 and the second rotational speed signal S2 acts as an interrupt pulse for the microcomputer, and the timing of the edge of the pulse is recognized as the interrupt timing, and the interval between the interrupt timings of the respective rotation sensors. The time is measured and the speed is calculated. Here, first, the rotational speed is calculated based on the interrupt timing of the first rotational speed signal S1 which is relatively less affected by the noise signal, and based on the resultant rotational value, the first rotational speed signal S1 and the second The interrupt permission period for each pulse of the rotational speed signal S2 is set.

1 (b) shows the pulses PA2, PA3, ... of the first rotational speed signal S1 which are pulse signals. Interrupt permission periods for X1, X2,... 1 (d) shows each pulse PB1, PB2,... Of the second rotational speed signal S2. Interrupt permission periods for YA1 and YB1, YA2 and YB2,... It represents.

Therefore, when the noise signals are superimposed on the first and second rotational speed signals S1 and S2, interrupts are not permitted for the noise signals generated in the period indicated by the diagonal lines in Figs. 1 (b) and (d), respectively. Becomes out of the processing target, and interrupt permission periods X1, X2,... And YA1, YB1, YA2, YB2,... Only pulses for the calculation of the number of revolutions are taken in each period of.

Among the pulses generated in each interrupt permission period, the edge timing of the pulse generated by the interrupt in the earliest stage is used for the calculation of the rotation speed as the interrupt timing.

In this manner, the pulses used for calculating the rotational speed are pulses generated during the interrupt permission period set according to the rotational speed calculation result based on the first rotational speed signal S1 obtained from the first rotational sensor with less influence of the noise signal. It is to use. As a result, reliable rotational speed calculation can be performed, and since the calculation of the rotational speed is performed by using the interrupt timing by the pulse generated by the interrupt in the earliest, a stable arithmetic operation can be expected.

2 and 3 show a rotational speed signal processing program when the above-described processing is executed by a microcomputer, FIG. 2 is a program for processing the first rotational speed signal S1, and FIG. 3 is a second rotational speed. It is a program for processing the signal S2.

First, FIG. 2 is demonstrated. If an interruption of the first rotational sensor occurs in step 11, it is determined in step 12 whether it is the first interruption of the first rotational sensor. If it is the first interrupt, the determination result in step 12 is " YES ", and step 13 is entered, where the interrupt permission period C (n) = Co of the first rotation sensor is set. The interrupt permission period Co is set to 1000r.p.m. Before the calculation of the rotation speed based on the first rotation speed signal S1. It is set to a substantial period. In step 14, a flag F1 indicating completion of interruption of the first rotation sensor is set, and the process proceeds to step 15. In step 15, interrupt timing TM1 of this interrupt of the 1st rotation sensor is preserve | saved, and execution in this program cycle is complete | finished.

Next, the operation when not the first interrupt is illuminated. In this case, the determination result of step 12 is "no", and the process proceeds to step 16. In step 16, it is determined whether the interrupt is within the range of the interrupt permission period C (n). If the interrupt is not within the range of the interrupt permission period C (n), the determination result of step 16 is "no", and the process proceeds to step 17, where processing for disallowing this interrupt as a noise signal is executed. , Exit as is.

If the discrimination result in step 16 is YES, the flow proceeds to step 18, where the rotation speed is calculated from the time difference between the interrupt timing TM2 of the current interrupt and the previous interrupt timing TM1 stored.

In the next step 19, the next interrupt permission period C (n) for the first rotation sensor is set based on the rotation speed calculation result in step 18. In step 20, interrupt permission periods A (n) and B (n) for the second rotation sensor are set based on the rotation speed calculation result in step 18. This is because, as can be seen from FIG. 1, one cycle of the first rotational speed signal S1 from the first rotational sensor corresponds to two cycles of the second rotational speed signal S2 from the second rotational sensor. That is, at the timing of the generation of the pulse PA1 of the first rotational speed signal S1, the interrupt permission time X1 for the pulse PA2 of the first rotational speed signal S1 is set, and the pulses PB1 and PB2 of the second rotational speed signal S2 are set. The interrupt permission time YA1 and YB1 are set.

In step 15, the interrupt timing TM2 obtained in the current program cycle of the first rotation sensor is saved, and the execution of this program cycle is terminated.

Next, with reference to FIG. 3, the process of the 2nd rotation speed signal S2 from a 2nd rotation sensor is demonstrated.

In step 31, if an interrupt of the second rotation sensor occurs, it is determined in step 32 whether the flag F2 indicating the interrupt of the second rotation sensor has been set. If the flag F2 is not set, the determination result in step 32 is " NO ", and enters step 33, where it is determined whether or not it is within the range of the interrupt permission period A (n) of the second rotation sensor. If the interruption permit period A (n) of the second rotation sensor, the discrimination result of step 33 is YES, and the flow proceeds to step 34. In step 34, the rotation speed based on the second rotation speed signal S2 is calculated from the time difference between the previous interrupt timing of the second rotation speed signal S2 and the current interrupt timing. In the next step 35, a flag F2 indicating completion of interruption of the second rotation sensor is set, and the process proceeds to step 36.

In step 36, the interrupt timing of the second rotation sensor is saved at this time, and execution in the current program cycle is terminated.

If the determination result in step 33 is "NO", then the process proceeds to step 37, where the interrupt processing as a noise signal is executed, and the processing in this program cycle is terminated as it is.

Next, the operation when the flag F2 is set will be described. In this case, the determination result of step 32 is " Yes ", and the procedure proceeds to step 38. In step 38, it is determined whether the interrupt is within the range of the interrupt permission period B (n) of the second rotation sensor. If it is in the range of interrupt permission period B (n) of a 2nd rotation sensor, the determination result of step 38 will be "Yes," and will enter step 39. FIG. In step 39, the rotation speed based on the second rotation speed signal S2 is calculated from the time difference between the previous interrupt timing of the second rotation speed signal S2 and the current interrupt timing. In the next step 40, the setting of the flag F2 is released, and the flow proceeds to step 36. If the determination result in step 38 is "no", then step 37 is entered, and the interrupt signal at that time is disregarded as a noise signal.

According to the processing shown in Figs. 2 and 3, the first rotational speed signal S1 and the second rotational speed are according to the rotational speed calculated based on the first rotational speed signal S1 from the first rotational sensor with less influence of the noise signal. Interrupt permission periods are set for both signals S2, and interrupts to both sensors are allowed only within this interrupt permission period, so that a more reliable rotational speed calculation can be performed than in the prior art. In addition, in each interrupt permission period, since the first edge timing was made into the interrupt timing at that time, arithmetic operation is performed reliably and stably.

According to the present invention, the calculation of the rotation speed can be performed accurately and stably as described above.

Claims (1)

A method of processing a rotational speed signal for determining the rotational speed using a first rotational signal, which is hardly affected by the noise signal output as a pulse signal, and a second rotational signal, which is susceptible to the noise signal, respectively, A calculation step of calculating the rotation speed based on the first rotation speed signal; Setting an interrupt permission period for each of the first and second rotational speed signals based on the operation result obtained in the operation step; A timing processing step of processing an edge of the first pulse occurring within the interrupt permission period as normal interrupt timing; Calculating a rotation speed for each of the first and second rotation speed signals based on the interrupt timing obtained in the timing processing step. A method of processing a speed signal, characterized in that.

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