JP2016176694A - Rotation detection signal processing device and rotation detection signal processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the number of revolutions of a rotor from being erroneously detected.SOLUTION: A storage unit 41 stores a single pulse cycle that is a lapse time from when a previous pulse signal is inputted each time a pulse signal is inputted. An arithmetic unit 42 divides an arithmetic cycle time by the number of pulse signals inputted within an arithmetic cycle and calculates an average pulse cycle. A determination unit 43 determines which of the maximum value and minimum value of the single pulse cycle and a pulse non-input time from when a pulse signal is last inputted within the arithmetic cycle to when the arithmetic cycle is terminated deviates from the average pulse cycle. A number of revolutions determination unit 44 updates the arithmetic number of revolutions calculated on the basis of the average pulse cycle as the number of revolutions of the rotor when there is no deviation, and maintains the previous number of revolutions of the rotor when there is deviation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotation detection signal processing apparatus and a rotation detection signal processing method suitable for use in detecting the number of rotations of a rotating element of a mechanism for transmitting power rotation.

  For example, in a mechanism that transmits power rotation, such as a driving system of an automobile, it is required to accurately detect the number of rotations of a rotating element (rotating body), and a rotation detecting device that detects the number of rotations of the rotating body has been developed. ing. In such a rotation detection device, it is a problem to prevent erroneous rotation detection due to noise or the like. For example, in Patent Document 1, in a hybrid vehicle, when the engine is stopped and the vehicle is running with a motor output, the rotation detection device is caused by vehicle vibration or noise of a vehicle-mounted control device (motor, generator, etc.). In some cases, a detection signal is output, and this detection signal is erroneously determined to be a regular pulse signal.

  In patent document 1, it is going to solve the subject that the detection of rotation of a rotary body is prohibited at the time of an engine stop, and an erroneous detection signal will be output from a rotation detection apparatus. In other words, the rotation of the rotating body is detected by the detection element, the detection waveform by the detection element is compared with a predetermined reference voltage by the comparator, a pulse signal is generated from the output of the comparator, and the rotation speed is calculated from this pulse signal. In the rotation detection device for detecting the switching element, a switching element for electrically connecting the high side of the detection element and a predetermined low voltage point is provided. When the engine is stopped, the switching element is turned on to detect a waveform detected by the detection element (input voltage). ) Is fixed at a predetermined low voltage level and rotation detection is prohibited.

JP 2003-214905 A

  However, the technique of Patent Document 1 only prevents the rotation detection signal from being erroneously generated due to some cause in a state where the rotation speed detection is not necessary, such as when the engine is stopped. There is a problem that it is impossible to avoid or prevent erroneous detection of the rotation speed due to vibration, noise, or the like in a situation where the rotation speed detection is necessary.

  The present invention was devised to solve the above-described problems, and provides a rotation detection signal processing device and a rotation detection signal processing method capable of preventing erroneous detection of rotation. Objective.

  (1) In order to achieve the above object, the rotation detection signal processing apparatus of the present invention is a detection means (detection) that detects the passage of a detection object (irregularities or slits) having a specific shape formed on a rotating body at regular intervals. A rotation detection signal processing device for processing a detection signal output from the element), a pulse generation means for generating a pulse signal from the detection signal input from the detection element, and a pulse signal generated by the pulse generation means And calculating means for calculating the number of rotations (per unit time) of the rotating body based on the above, the calculating means each time a pulse signal is input, the time elapsed since the previous pulse signal was input Single pulse cycle storage unit that stores the single pulse cycle that is time, and average pulse cycle calculation unit that calculates the average pulse cycle by dividing the calculation cycle time by the number of pulse signals input within the calculation cycle The maximum and minimum values of the single pulse period and the pulse non-input time from when the pulse signal is last input in the calculation period to the end of the calculation period are compared with the average pulse period. A determination unit that determines whether or not there is a deviation between the maximum value, the minimum value, and the pulse non-input time with respect to the average pulse period; and if the determination unit determines that there is no deviation, the calculation is based on the average pulse period. The calculated rotational speed is updated as the rotational speed of the rotating body, and if the determination unit determines that there is a divergence, a rotational speed determining section that maintains the rotational speed of the rotating body in the previous calculation cycle, It is characterized by having.

  (2) The determination unit includes a deviation obtained by subtracting the average pulse period from the maximum value, a deviation obtained by subtracting the minimum value from the average pulse period, and a deviation obtained by subtracting the average pulse period from the pulse non-input time. It is preferable to determine that there is a divergence if any deviation is greater than or equal to the determination reference value, and to determine that there is no divergence if any deviation is less than the determination reference value.

  (3) Alternatively, the determination unit determines a ratio between the maximum value and the average pulse period, a ratio between the minimum value and the average pulse period, and a ratio between the pulse non-input time and the average pulse period. It is preferable to determine that there is a divergence if any ratio is outside the determination range, and to determine that there is no divergence if any ratio is within the determination range, as compared with each determination range.

  (4) The pulse generation unit compares the value of the detection signal with a predetermined reference value, and at least one of a timing when the value of the detection signal exceeds the reference value and a timing when the value of the detection signal falls below the reference value. Preferably, the pulse signal is generated based on the above.

(5) The determination unit, to the computation period, alone when the pulse period T _I only one obtained only is impossible determination, it is determined that no pulse signal when there is no input of the pulse signal, The rotation speed determination unit maintains the rotation speed of the rotating body in the previous control cycle when the determination section determines that the determination is impossible, and sets the rotation speed of the rotating body to 0 when the determination section determines that there is no pulse signal. It is preferable that

  (6) In the rotation detection signal processing method of the present invention, a detection signal output from a detection means (detection element) that detects the passage of a detection object (irregularity or slit) having a specific shape formed on the rotating body at regular intervals. A rotation detection signal processing method for processing, comprising: a pulse generation step for generating a pulse signal from a detection signal input from the detection element; and a unit (unit) of the rotating body based on the pulse signal generated in the pulse generation step. A calculation step for calculating the number of revolutions per time, and each time the pulse signal is input, the calculation step stores a single pulse period that is an elapsed time since the previous pulse signal was input. After the completion of the preset calculation cycle and the single pulse cycle storage step, the average pulse is calculated by dividing the calculation cycle time by the number of pulse signals input within the calculation cycle. An average pulse period calculating step for calculating a period, a maximum value and a minimum value of the single pulse period after the execution of the average pulse period calculating step, and the calculation period from the last pulse signal input in the calculation period A step of determining whether or not there is a deviation between the maximum value, the minimum value, and the pulse non-input time with respect to the average pulse cycle, by comparing the pulse non-input time until the end of the pulse with the average pulse cycle; If it is determined in the determination step that there is no divergence after the determination step, the calculated rotational speed calculated based on the average pulse period is updated as the rotational speed of the rotating body, and the divergence is determined in the determination step. A rotation speed determination step for maintaining the rotation speed of the rotating body in the previous calculation cycle if it is determined that To have.

  According to the present invention, when a pulse signal is input within a calculation cycle, the single pulse cycle is stored. When the calculation cycle is completed, the maximum value and minimum value of the stored single pulse cycle, and finally the pulse signal is stored. The pulse non-input time after input is compared with the calculated average pulse period, and the presence / absence of deviation of the maximum value, minimum value and pulse non-input time with respect to the average pulse period is determined. If it is determined that there is no divergence, it is determined that the pulse signal is normal, the calculated rotational speed calculated based on the average pulse period is updated as the rotational speed of the rotating body, and if it is determined that there is a divergence, the pulse signal Is not normal, and maintains the rotational speed of the rotating body in the previous calculation cycle. In this way, based on the input pulse signal, it is determined whether or not the pulse signal is normal. If the pulse signal is normal, the number of rotations of the rotating body is updated. The latest rotation information can be obtained as much as possible. In addition, when it is determined that the pulse signal is not normal, the calculation rotational speed is not updated as the rotational speed of the rotating body, so that the rotating body is rotated by a pulse signal due to vibration or noise even though the rotating body is not rotating. Thus, erroneous detection of rotation can be prevented.

It is a block diagram which shows the rotation detection signal processing apparatus concerning one Embodiment of this invention. It is a schematic diagram which shows the rotation element of the transmission which is a rotary body suitable for applying the rotation detection signal processing apparatus concerning one Embodiment of this invention. It is a time chart explaining the process by the rotation detection signal processing apparatus concerning one Embodiment of this invention, (a) shows the detection signal of a rotation sensor, (b) shows the produced | generated pulse signal, (c) is The single pulse period T _I , the number of pulse signals n, and the calculation period time CT are shown. It is a time chart which explains concretely processing by a rotation detection signal processing device concerning one embodiment of the present invention, and (a)-(f) shows an example of pulse signal input, respectively. It is a main routine flowchart which shows the rotation detection signal processing method using the rotation detection signal processing apparatus concerning one Embodiment of this invention. It is a subroutine flowchart which shows the rotation detection signal processing method using the rotation detection signal processing apparatus concerning one Embodiment of this invention.

Hereinafter, a rotation detection signal processing apparatus and a rotation detection signal processing method using the same according to an embodiment of the present invention will be described with reference to the drawings.
The rotation detection signal processing apparatus according to the present embodiment can be applied to detection of rotation of various rotating bodies, and the number of rotations (the number of rotations per unit time, i.e. It is also suitable to use for detecting the rotation speed). For example, as shown in FIG. 2, it is one of the rotating elements (rotating bodies) of a continuously variable transmission 3 connected to an engine 1 of an automobile via a forward / reverse switching mechanism 2 including a forward clutch and a reverse brake. It can be used to detect the rotation speed of the primary shaft (input shaft) 3PS.

[1. Device configuration〕
As shown in FIG. 1, on a rotating body (such as a shaft itself or a circular object that rotates integrally with a shaft) 10, detection objects 11 having a specific shape such as irregularities or slits are formed on the same circumference at regular intervals. ing. In this example, uneven detection objects 11 are formed at regular intervals on the outer periphery of the rotating body 10. Here, a Hall element is used as the rotation sensor (detection means) 20 that detects the rotation of the rotating body 1, and the rotation sensor 20 is disposed with the sensing unit facing the detection target 11.

  The hall element converts the magnetic quantity into an electric quantity (here, voltage) and outputs it. When the convex part of the detection target 11 enters the reaction region of the sensing part, the magnetic quantity increases, and accordingly the output is output accordingly. When the amount of electricity to be increased increases and the concave portion of the detection target 11 enters the reaction region of the sensing unit, the amount of magnetism decreases, so the amount of electricity to be output decreases accordingly. Therefore, the change in the amount of electricity output from the rotation sensor 20 indicates the movement of the detection target 11 with respect to the sensor unit 21.

  The rotation sensor 20 is not limited to a hall element, and other electromagnetic detection means such as an electromagnetic pickup may be used. These electromagnetic detection means have an advantage that they can be detected without using electric power. Further, the rotation sensor 20 is not limited to the electromagnetic type, and other detection means such as an optical type may be used. In this case, for example, a slit is formed at the same radial position of the rotating body 1 as a detection target, and an optical sensor in which a light emitting diode and a photodiode are opposed so that light can pass through the slit is installed. One that detects the transmission of light through the slit and outputs it as a signal is conceivable.

  The rotation detection signal processing device processes a detection signal from the rotation sensor 20, and generates a pulse signal (pulse generation means) 30 that generates a pulse signal from the detection signal of the rotation sensor 20 and a pulse generator 30. A calculation device (calculation means) that determines whether or not the pulse signal is an appropriate signal based on the pulse signal and calculates the number of rotations (per unit time) of the rotating body 10 when the pulse signal is an appropriate signal. 40.

  The pulse generator 30 includes a pulse generation circuit, compares the value (voltage value) of the detection signal of the rotation sensor 20 with a predetermined reference voltage, and increases the voltage value of the detection signal from less than the reference voltage to more than the reference voltage. Then, the signal is raised, and when it decreases from the reference voltage or more to less than the reference voltage, the signal is lowered to generate a pulse signal. For example, when the rotating body 10 is rotating, the voltage value of the detection signal of the rotation sensor 20 periodically rises and falls like a sine curve shown in FIG. If the reference voltage is taken in the middle of the voltage value that rises and falls, the voltage value of the detection signal of the rotation sensor 20 periodically rises and falls around the reference voltage, and as shown in FIG. A signal is generated.

Arithmetic unit 40 is configured to include a variety of interfaces such as a microcomputer, single pulse for calculating and storing the cycle (single pulse period) T _I of each pulse signal from the pulse signal input from the pulse generator 30 a period storage section 41, and the average pulse period calculating section 42 for calculating an average pulse period _{T AV,} the maximum value _{T IMAX} individual pulse period _{T I,} the maximum value of selecting the minimum value _{T IMIN,} the minimum value selecting unit 45, comparing the pulse non-input time calculating unit 46, the maximum value _{T IMAX} individual pulse period _{T I,} and the minimum value _{T IMIN} and pulse non-input time _{T NI,} and an average pulse period _{T AV} which calculates a pulse non-input time _{T NI} Then, the determination unit 43 that determines the presence or absence of the deviation, and the rotation number that determines the rotation number of the rotating body 10 based on the determination of the deviation by the determination unit 43 The determination unit 44 is provided as a functional element (software).

The single pulse cycle storage unit 41 is a single pulse cycle T that is an elapsed time since the previous pulse signal was input every time a pulse signal is input from the pulse generator 30 within a calculation cycle (period of each calculation cycle). _I is calculated and stored. The pulse signal is input when the pulse signal rises (that is, the voltage value of the detection signal increases from less than the reference voltage to the reference voltage or more) and the pulse signal falls (that is, the detection signal The voltage value has decreased from the reference voltage to less than the reference voltage). Note that even if the calculation cycle time (calculation cycle time) CT is the minimum rotation number within the rotation speed range to be detected for the assumed rotating body 10, a plurality of pulse signals are input within the calculation cycle. The time is set in advance.

For example, if it is defined that a pulse signal has been input when the pulse signal falls, as shown in FIG. 3C, the pulse is pulsed at each time point t ₁ , t ₂ , t ₃ , t ₄ when the pulse signal falls. it is determined that the signal has been input, single pulse cycle is the elapsed time from the previous pulse signal of the pulse signal P1, P2, P3, P4 of each time point _{t 1, t 2, t 3} , t 4 is input It calculates and stores the T _I.

For example, if the pulse signal P2 is input, the elapsed time _T 12 from the input of the previous pulse signal P1 ₍₌ t 2 -t ₁₎ and calculates the stored as a single pulse period _{T I.} Similarly, when the pulse signal P3 is input, the elapsed time T ₂₃ (= t ₃ −t ₂ ) after the previous pulse signal P2 is input, and when the pulse signal P4 is input, the previous pulse signal P3 is The elapsed time T ₃₄ (= t ₄ −t ₃ ) from the input is calculated and stored as a single pulse period T _I. Further, when the pulse signal P1 is input, an elapsed time T ₀₁ (= t ₁ −t ₀ ) from the input of the previous pulse signal P0 before the calculation cycle is calculated, and the single pulse cycle is obtained. It is stored as T _I.

At the end of the calculation cycle, the average pulse cycle calculation unit 42 calculates the average pulse cycle T _AV by dividing the calculation cycle time CT by the number n of pulse signals input within the calculation cycle (T _AV = CT / n). For example, as shown in FIG. 3C, if the number of pulse signals in the calculation cycle is 4, the average pulse cycle _TAV is CT / 4.

Maximum, minimum selection unit 45, when the calculation cycle is completed, selects the maximum value T _IMAX and the minimum value T _IMIN from the single pulse period storage section 41 in the stored individual pulse period T _I . Single pulse period T _I in one operation period is assumed that there exist a plurality of determination by the determination unit 43 if a single pulse period T _I is only one disabled and in this case, the rotation speed determining The unit 44 maintains the rotation speed set in the previous calculation cycle. If there is no single pulse period T _I itself, i.e., if there is no input of the pulse signal determines the rotational speed to zero.

The pulse non-input time calculation unit 46 calculates a pulse non-input time T _NI that is an elapsed time from the last input of a pulse signal within the calculation cycle to the end of the calculation cycle. For example, in the example shown in FIG. 3 (c), the end time elapsed from the time t ₄ when the pulse signal is input to the time t ₅ that the calculation cycle is completed pulse non-input time T _{NI (=} t ₅ -t ₄ )

Judgment unit 43, the maximum value _{T IMAX} and the minimum value _{T IMIN} individual pulse period, a pulse non-input time _{T NI,} compared with the average pulse period _{T AV,} the maximum value _{T IMAX} to the average pulse period _{T AV,} It is determined whether or not there is a deviation between the minimum value T _IMIN and the pulse non-input time T _NI .

Here, the following equation mean deviation obtained by subtracting the average pulse period _{T AV} from the maximum value _{T IMAX} DT1, the average pulse period _T deviation obtained by subtracting the minimum value _{T IMIN} from _AV DT2, and pulse non-input time _{T NI} deviation DT3 obtained by subtracting the pulse period _{T AV} calculated respectively, and compare these deviations DT1~DT3 the determination reference value DT _J, any deviation DT1~DT3 is O and there divergence if exceeds the determination reference value DT _J judgment, it is determined that no deviation if any deviation DT1~DT3 than the determination reference value DT _J.
DT1 ₌ T IMAX _{-T AV}
DT2 ₌ T _{AV -T IMIN}
DT3 ₌ T NI _{-T AV}

And rotor 10 is rotating, in a case where a normal pulse signal is input in response to this, in a calculation period, alone since the pulse period T _I will not change suddenly, average pulse from the maximum value T _IMAX deviation DT1 obtained by subtracting the period _{T AV} shall not deviate from the average pulse period _{T AV} a minimum value _{T IMIN} slightly deviation DT2 obtained by subtracting (hereinafter determination reference value DT _J). Further, as long as the rotating body 10 does not stop within the calculation cycle, the pulse non-input time T _NI is at most around the maximum value T _IMAX and the deviation DT3 is a negative value or a positive value, which is a little (determination criterion). Value DT _J or less) and no deviation. From such a viewpoint, the determination reference value DT _J is set.

FIG. 4 is a time chart showing examples of input of various pulse signals. In this example, the calculation cycle time is 10 ms (= msec). Further, the determination reference value DT _J is set to 0.5 ms, for example.

Example shown in FIG. 4 (a), is seven pulse signals in a certain calculation cycle (n = 7) is input, single pulse period T _I of each pulse signal is both a 1.5 ms, the pulse non-input time T _NI is 0.3 ms. In this case, the average pulse period T _AV is about 1.43 ms, and the maximum value T _IMAX and the minimum value T _IMIN are both 1.5 ms. Maximum value _{T IMAX} and average pulse period _{T AV} deviation between _{DT1 (=} T IMAX _{-T AV)} next to the 0.07Ms, average pulse period _{T AV} and the minimum value _{T IMIN} and deviation _DT2 (= _{T AV -T IMIN)} next is -0.07Ms, deviation between the pulse non-input time _{T NI} and the average pulse period _{T AV DT3 (= T NI -T} AV) becomes -1.13Ms. Therefore, since all of the deviations DT1 to DT3 are equal to or less than the determination reference value DT _J (= 0.5 ms), it is determined that there is no deviation.

4 example shown in (b) is the calculation cycle seven pulse signals (n = 7) is input, the single pulse period _{T I} is 1.5ms both from 1.4ms of each pulse signal, 1.6 ms , 1.7 ms, increasing slightly. The pulse non-input time T _NI is 0.2 ms. In this case, the average pulse period T _AV is about 1.43 ms, the maximum value T _IMAX is 1.7 ms, and the minimum value T _IMIN is 1.4 ms. Maximum value _{T IMAX} and average pulse period _{T AV} deviation between _{DT1 (=} T IMAX _{-T AV)} next to the 0.27Ms, average pulse period _{T AV} and the minimum value _{T IMIN} and deviation _DT2 (= _{T AV -T IMIN)} next is 0.03Ms, deviation between the pulse non-input time _{T NI} and the average pulse period _{T AV DT3 (= T NI -T} AV) becomes -1.23Ms. Therefore, since all of the deviations DT1 to DT3 are equal to or less than the determination reference value DT _J (= 0.5 ms), it is determined that there is no deviation.

Example shown in FIG. 4 (c), are two pulse signals a certain calculation cycle (n = 2) is input, single pulse period T _I of each pulse signal is both a 2.5 ms, the pulse non-input time T _NI is 5.3 ms. In this case, the average pulse period T _AV is 5 ms, and the maximum value T _IMAX and the minimum value T _IMIN are both _2.5 ms. Maximum value _{T IMAX} and average pulse period _{T AV} deviation between _{DT1 (=} T IMAX _{-T AV)} next is 2.5 ms, the average pulse period _{T AV} and the minimum value _{T IMIN} and deviation _DT2 (= _{T AV -T IMIN)} next is 2.5 ms, the deviation between the pulse non-input time _{T NI} and the average pulse period _{T AV DT3 (= T NI -T} AV) becomes 0.3 ms. Accordingly, the deviations DT1 and DT2 exceed the determination reference value DT _J (= 0.5 ms), so that it is determined that there is a deviation.

Example shown in FIG. 4 (d) are four pulse signals in a certain calculation cycle (n = 4) is input, single pulse period _{T I} of each pulse signal is 1 ms, 1.5 ms, 1.5 ms, be 6ms The pulse non-input time T _NI is 0.8 ms. In this case, the average pulse period T _AV is _2.5 ms, the maximum value T _IMAX is 6 ms, and the minimum value T _IMIN is 1 ms. Maximum value _{T IMAX} and average pulse period _{T AV} deviation between _{DT1 (=} T IMAX _{-T AV)} next is 3.5 ms, the average pulse period _{T AV} and the minimum value _{T IMIN} and deviation _DT2 (= _{T AV -T IMIN)} It is 1.5ms, and the deviation between the pulse non-input time _{T NI} and the average pulse period _{T AV DT3 (= T NI -T} AV) becomes -1.7Ms. Accordingly, the deviations DT1 and DT2 exceed the determination reference value DT _J (= 0.5 ms), so that it is determined that there is a deviation.

Example shown in FIG. 4 (e), are two pulse signals a certain calculation cycle (n = 3) are input, single pulse period _{T I} of each pulse signal is 20 ms, 3 ms, is 3 ms, the pulse non-input time T _NI is 2 ms. In this case, the average pulse period T _AV is about 3.3 ms, the maximum value T _IMAX is 20 ms, and the minimum value T _IMIN is 3 ms. Maximum value _{T IMAX} and average pulse period _{T AV} deviation between _{DT1 (=} T IMAX _{-T AV)} next is 16.7 ms, the average pulse period _{T AV} and the minimum value _{T IMIN} and deviation _DT2 (= _{T AV -T IMIN)} next is 0.3 ms, the deviation between the pulse non-input time _{T NI} and the average pulse period _{T AV DT3 (= T NI -T} AV) becomes -1.3Ms. Accordingly, the deviations DT1 and DT3 exceed the determination reference value DT _J (= 0.5 ms), so that it is determined that there is a deviation.

Example shown in FIG. 4 (f) is two pulse signals a certain calculation cycle (n = 2) is input, single pulse period _{T I} of each pulse signal is 1.6 ms, a 1.4 ms, pulse non-input The time T _NI is 7.2 ms. In this case, the average pulse period T _AV is 5 ms, the maximum value T _IMAX is 1.6 ms, and the minimum value T _IMIN is 1.4 ms. Maximum value _{T IMAX} and average pulse period _{T AV} and deviation _{DT1 (=} T IMAX _{-T AV)} is -3.4ms next, a deviation between the average pulse period _{T AV} and the minimum value _{T IMIN DT2 (= T AV -T} IMIN ) deviation _{DT3 (=} T NI _{-T AV} of the average pulse period _{T AV} becomes 3.6 ms, the pulse non-input time _{T NI} is) becomes -2.2Ms. Accordingly, the deviations DT2 and DT3 exceed the determination reference value DT _J (= 0.5 ms), so that it is determined that there is a deviation.

The rotation speed determination unit 44 determines the rotation speed of the rotating body 10 according to the presence or absence of a deviation in the determination unit 43. For example, if the determination unit 43 determines that there is no deviation, the pulse signal is normal in the control cycle. as input to, calculates the rotational speed Rn of the rotor 10 on the basis of the average pulse period T _AV computed in the control cycle, rotational speed is set to the previous operation cycle at the new rotational speed Rn Update.

The calculation of the rotational speed Rn based on the average pulse period T _AV, the number of several or convex portion of the concave portion to be detected 11 number Pn (uneven shape of the pulse signal rotor 10 is entered when one rotation, or , and corresponds to the number of slits) can be calculated from the average pulse period T _AV by the following equation. If the average pulse period TAV is set to a minute unit, the unit of the rotational speed Rn is rpm.
_{Rn = 1 / (T AV ·} Pn)

Further, when the determination unit 43 determines that there is a deviation, the rotation speed determination unit 44 assumes that a pulse signal has been input in error in the control cycle, that is, a normal pulse has not been generated or due to noise or the like. as an abnormal pulse is generated, the average pulse period T _AV computed in the control period are invalid and maintains the rotational speed is set to the previous computation cycle.

[2. Action and effect)
Since the rotation detection signal processing apparatus according to the embodiment of the present invention is configured as described above, the rotation detection signal is processed, for example, as shown in the main flowchart of FIG. 5 and the sub-flowchart of FIG. Note that the flowcharts of FIGS. 5 and 6 are repeatedly executed at an extremely short processing cycle during the operation of the rotation detection signal processing device. Also, the timer count is started with the activation of the rotation detection signal processing device.

  As shown in FIG. 5, the input of the rotation detection signal from the rotation sensor 20 is monitored at an extremely short processing cycle, and it is determined whether or not the rotation detection signal has been input (step S10). When the rotation detection signal is input, the pulse generator 30 generates a pulse signal from the rotation detection signal (step S20).

Then, the counting the number of input pulse signals, the single pulse period storage unit 41, the previous pulse signal each time the pulse signal is input is the time elapsed from the input of the single pulse period T _I Calculate and store (step S30). The timer count value TM is read (step S40). On the other hand, if the rotation detection signal is not input, the process proceeds directly from step S10 to step S40, and the timer count value TM is read.

Thereafter, it is determined whether or not the timer count value TM has reached a threshold value TM0 corresponding to the calculation cycle time CT (step S50). If the timer count value TM does not reach the threshold value TM0, the processing in that processing cycle is terminated. There the other hand, when the timer count value TM reaches the threshold value TM0, determines whether there is a pulse signal (step S51), if there is a pulse signal, to the operation period, the number of single pulse period T _I is 2 or more Whether or not (step S52). If the number of individual pulse period T _I is 2 or more, the process proceeds to step S60 and later, to determine the propriety of the pulse signal, performing the rotation speed of the determination of the rotating body 10.

First, the average pulse period calculation unit 42 calculates the average pulse period T _AV (= CT / n) by dividing the calculation period time CT by the number n of pulse signals counted in step S30 (step S60). Then, the maximum value, a minimum value selection unit 45, selects the maximum value _{T IMAX} and the minimum value _{T IMIN} from the single pulse period storage section 41 in the stored individual pulse period _{T I} (step S70). Further, the pulse non-input time calculator 46 calculates the pulse non-input time T _NI (step S80).

When the average pulse period T _AV , the maximum value T _IMAX and the minimum value T _{IMIN of} the single pulse period T _I , and the pulse non-input time T _NI are obtained in this way, whether the pulse signal is correct or not is determined (step S90).
Correctness determination of the pulse signal, as shown in FIG. 6, the deviation obtained by subtracting the average pulse period _{T AV} from the maximum value _{T IMAX DT1 (= T IMAX -T} AV), the minimum value _{T IMIN} from the average pulse period _{T AV} subtracting deviation _{DT2 (= T AV -T IMIN)} , and pulse non-input time _{T NI} deviation obtained by subtracting the average pulse period _{T AV} from _{DT3 (=} T NI _{-T AV)} is compared with the respective judgment reference value DT _J ( Steps S91 to S93). If the deviations DT1, DT2, and DT3 are all equal to or less than the determination reference value DT _J , the pulse signal is positive (ie, there is no difference between the maximum value T _IMAX , the minimum value T _IMIN, and the pulse non-input time T _NI with respect to the average pulse period T _AV (Normal)) (step S94). On the other hand, if either of the deviation DT1, DT2, DT3 is exceeds the determination reference value DT _J, as the maximum value _{T IMAX,} Departures minimum _{T IMIN} and pulse non-input time _{T NI} there to the average pulse period _{T AV,} pulse The signal is determined to be erroneous (abnormal) (step S95).

When this pulse signal is determined to be correct or not, as shown in FIG. 5, depending on whether or not the pulse signal is correct (step S100), if the pulse signal is normally input, the control period is calculated. was calculated rotational speed Rn of the rotor 10 on the basis of the average pulse period T _AV, the new rotational speed Rn _{[= 1 / (T AV · Pn} ) ] in the rotary body was set to the previous operation cycle 10 Is updated (step S110). On the other hand, if the pulse signal is input in error, the rotation speed set in the previous calculation cycle is maintained (step S120).

Then, the average pulse period T _AV , the maximum value T _IMAX and the minimum value T _{IMIN of} the single pulse period T _I , the pulse non-input time T _NI , and the timer value are reset to 0, and a new processing cycle is started. Switching to the calculation cycle, the same processing as described above is performed. Every calculation cycle until the rotation detection signal processing apparatus is stopped, correctness determination of the pulse signal is made, if the pulse signal is normally input, the rotation at the new rotational speed Rn _{[= 1 / (T AV · Pn} ) ] The number of rotations of the body 10 is updated.

The determination unit 43 to the calculation cycle, alone when the pulse period T _I only one obtained only is impossible determination, the process proceeds from step S52 to step S120, the rotation speed determination unit 44 of the previous The rotational speed Rn of the rotating body 10 in the control cycle is maintained. Further, when there is no pulse signal input itself, it is determined that there is no pulse signal, so the process proceeds from step S51 to step S121, and the rotational speed determination unit 44 sets the rotational speed Rn of the rotating body to zero.

In this way, whether or not the pulse signal is normal from the average pulse period T _AV based on the input pulse signal, the maximum value T _IMAX and the minimum value T _{IMIN of} the single pulse period T _I , and the pulse non-input time T _NI. If the pulse signal is normal, the rotation number of the rotating body is updated, so that the latest accurate rotation information can be obtained from the normal pulse signal.

  For example, as shown in FIG. 2, when used for detecting the rotation speed of the primary shaft (input shaft) 3PS of the continuously variable transmission 3 connected to the engine 1 of the automobile via the forward / reverse switching mechanism 2, Even when the forward clutch and the reverse brake of the switching mechanism 2 are separated and stopped, the idling vibration of the engine 1 and the vehicle body vibration resulting therefrom are transmitted to the primary shaft 3PS to generate minute circumferential vibration (rotational vibration). Sometimes. Since the secondary shaft (output shaft) 3SS is connected to the drive wheels, the stopped drive wheels suppress such minute rotational vibration.

  When the primary shaft 3PS generates minute rotational vibration, the detection target 11 facing the sensor unit 21 of the rotation sensor 20 reciprocates slightly to change the magnetic quantity, and this is an electric quantity (here, voltage). Converted to increase or decrease the amount of electricity. When this increase / decrease occurs near the reference voltage, a pulse signal is generated. If this pulse signal is processed as appropriate, the number of rotations of the stopped primary shaft 3PS is calculated. However, since the pulse signal generated by such minute rotational vibration is irregular, in the rotation detection signal processing apparatus and the rotation detection signal processing method according to the present embodiment, it can be determined that the pulse signal is input by mistake. And such false detection is avoided.

  In addition, as described in Patent Document 1, in a hybrid vehicle, when the engine is stopped and the vehicle is running with the motor output, it is caused by vehicle vibration or noise of an in-vehicle control device (motor, generator, etc.). In some cases, an erroneous detection signal is output from the rotation sensor 20, but in this case as well, since the pulse signal is irregular, in the rotation detection signal processing device and the rotation detection signal processing method according to the present embodiment, the pulse signal is irregular. It can be determined that the signal is input in error, and such erroneous detection is avoided.

  In addition, according to the present apparatus and method, it is possible to determine that a normal pulse signal is not input even when an abnormal pulse is generated due to some factor such as noise in a situation where the rotational speed is detected. , Erroneous detection of the rotational speed can be prevented.

[Others]
The embodiment of the present invention has been described above, but the apparatus and method of the present invention are not limited to the above embodiment, and the above embodiment is appropriately modified and implemented without departing from the spirit of the present invention. be able to.

For example, in the embodiment, the deviation DT1, DT2, DT3 although both are determined whether or not the deviation as compared to the common criterion value DT _J a deviation DT1, DT2, respectively individually for each DT3 A determination reference value may be given to determine whether or not there is a deviation.

Further, instead of the deviations DT1, DT2, DT3, the ratio R1 (= T _IMAX / T _AV ) between the maximum value T _IMAX of the single pulse period T _I and the average pulse period T _AV, and the minimum value T of the single pulse period T _I The ratio R2 (= T _IMIN / T _AV ) between _IMIN and the average pulse period T _AV and the ratio R3 (= T _NI / T _AV ) between the pulse non-input time T _NI and the average pulse period are respectively determined within the determination ranges (R01 ~ R02, however, compared to R01 <1,1 <R02), if any of the ratios R1 to R3 is outside the determination range (R01 to R02), it is determined that there is a deviation, and any of the ratios R1 to R3 If it is within the determination range (R01 to R02), it may be determined that there is no deviation. In this case as well, a common determination range may be given to the ratios R1, R2, and R3, but a determination range may be given individually so that determination can be made with high accuracy.

In the embodiment, the pulse generator 30 having a pulse generation circuit is used as the pulse generation means. However, the pulse generation means may be a functional element (software) of the arithmetic unit 40 or other computer.
In the embodiment, the rectangular pulse signal is generated by the pulse generating means. However, it may be configured to generate only the rising or falling pulse signal of the rectangular pulse wave.

1 Engine 2 Forward / reverse switching mechanism 3 Continuously variable transmission 3PS Primary shaft (input shaft)
DESCRIPTION OF SYMBOLS 10 Rotating body 11 Detection target 20 Rotation sensor (detection means)
21 sensor part 30 pulse generator (pulse generation means)
40 Arithmetic unit (calculation means)
41 Single pulse cycle storage unit 42 Average pulse cycle calculation unit 43 Judgment unit 44 Speed determination unit 45 Maximum value / minimum value selection unit 46 Pulse non-input time calculation unit

Claims (6)

A rotation detection signal processing apparatus for processing a detection signal output from a detection means for detecting the passage of a detection object of a specific shape formed at a predetermined interval on a rotating body,
Pulse generation means for generating a pulse signal from the detection signal input from the detection element;
Calculation means for calculating the number of rotations of the rotating body based on the pulse signal generated by the pulse generation means,
The computing means is
A single pulse period storage unit that stores a single pulse period that is an elapsed time since the previous pulse signal was input each time a pulse signal is input;
An average pulse period calculation unit that calculates the average pulse period by dividing the calculation period time by the number of pulse signals input within the calculation period;
Comparing the maximum and minimum values of the single pulse period and the pulse non-input time from the last pulse signal input in the calculation period to the end of the calculation period, with the average pulse period, A determination unit for determining whether or not there is a deviation between the maximum value, the minimum value, and the pulse non-input time with respect to the average pulse period;
When the determination unit determines that there is no divergence, the calculation rotation number calculated based on the average pulse period is updated as the rotation number of the rotating body, and when the determination unit determines that there is the divergence, A rotation number determination unit that maintains the rotation number of the rotating body in the calculation cycle of the rotation detection signal processing device. The determination unit determines a deviation obtained by subtracting the average pulse period from the maximum value, a deviation obtained by subtracting the minimum value from the average pulse period, and a deviation obtained by subtracting the average pulse period from the pulse non-input time. The comparison with a reference value determines that there is a deviation if any deviation is greater than or equal to the determination reference value, and determines that there is no deviation if any deviation is less than the determination reference value. The rotation detection signal processing device according to 1. The determination unit compares a ratio between the maximum value and the average pulse period, a ratio between the minimum value and the average pulse period, and a ratio between the pulse non-input time and the average pulse period, respectively, with a determination range. The rotation detection according to claim 1, wherein if any ratio is outside the determination range, it is determined that there is a deviation, and if any ratio is within the determination range, it is determined that there is no deviation. Signal processing device. The pulse generation unit compares the value of the detection signal with a predetermined reference value, and based on at least one of a timing when the value of the detection signal exceeds the reference value and a timing when the value of the detection signal falls below the reference value. The rotation detection signal processing apparatus according to claim 1, wherein the rotation detection signal processing apparatus generates a pulse signal. The determination unit determines that determination is impossible when only one single pulse period is obtained within the calculation period, and determines that there is no pulse signal when no pulse signal is input,
The rotation speed determination unit maintains the rotation speed of the rotating body in the previous control cycle when the determination section determines that the determination is impossible, and sets the rotation speed of the rotating body to 0 when the determination section determines that there is no pulse signal. The rotation detection signal processing device according to any one of claims 1 to 4, wherein A rotation detection signal processing method for processing a detection signal output from a detection means for detecting passage of a detection object having a specific shape formed at a predetermined interval on a rotating body,
A pulse generation step of generating a pulse signal from the detection signal input from the detection element;
A calculation step of calculating the number of rotations of the rotating body based on the pulse signal generated in the pulse generation step,
The calculation step includes:
Each time a pulse signal is input, a single pulse period storage step for storing a single pulse period that is an elapsed time since the previous pulse signal was input;
An average pulse period calculation step for calculating an average pulse period by dividing the calculation period time by the number of pulse signals input within the calculation period after completion of the preset calculation period;
After the execution of the average pulse period calculation step, the maximum value and minimum value of the single pulse period and the pulse non-input time from the last pulse signal input in the calculation period to the end of the calculation period A determination step of determining whether or not there is a divergence between the maximum value, the minimum value, and the pulse non-input time with respect to the average pulse period, as compared with the average pulse period;
If it is determined in the determination step that there is no divergence after the determination step, the calculated rotational speed calculated based on the average pulse period is updated as the rotational speed of the rotating body, and the divergence is determined in the determination step. A rotation number determination step for maintaining the rotation number of the rotator in the previous calculation cycle if it is determined that there is a rotation detection signal processing method.

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