JP2016200514A - Rotational speed measuring device, speed changer control system, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotational speed measuring device, a speed changer control system, and a program that can detect the rotational speed of a rotating body which is rotating slowly.SOLUTION: A rotation sensor 4 detects a concavity and/or a convexity of a rotating body 1 and outputs a first signal according to the concavity and/or the convexity. A rotation sensor 5 detects a concavity and/or a convexity of the rotating body 1 and outputs a second signal according to the concavity and/or the convexity. A computer 8 calculates the rotational speed of the rotating body 1 based on the distance between the rotation sensor 4 and the rotation sensor 5 and the phase difference between the first and second signals.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotational speed measurement device, a transmission control system, and a program.

  In a vehicle control device, the rotational speed of a rotating body is measured and used for various controls. For example, in a transmission for a vehicle, the rotational speed of an output shaft is measured to calculate a vehicle speed, which is used for determining a gear position.

  A rotation sensor such as a magnetic sensor is used to detect the rotation speed. The rotation sensor electromagnetically detects uneven edges on the surface of the rotator such as gears and notches, and converts them into electrical signals such as pulse signals according to the characteristics of the sensor and outputs them.

  The output signal of the rotation sensor is input to a measurement computer in order to calculate the rotation speed. The computer calculates the rotational speed from known data such as the tooth width and interval of the gear, the number of teeth, the number of pulses detected by the computer within a predetermined time, and the time interval.

  However, when the rotational speed of the rotating body is reduced, the time from when the rotation sensor detects the convex portion of the gear to when the next convex portion is detected becomes longer, so the time interval of the pulses output by the rotational sensor also becomes longer. . Since the computer calculates the rotational speed from the pulses detected within a certain time and the time interval, the time interval cannot be measured if the pulse time interval exceeds the measurement range of the computer. For this reason, if the rotational speed is below a certain value, the computer cannot calculate the rotational speed, so the rotational speed is determined to be zero.

  As a countermeasure for this, if the measurement time of the computer is lengthened, it is possible to calculate a low rotational speed. However, in order to measure the rotation, both ends of the pulse must be detected, so that the computer measurement time is required more than the actual pulse time interval. Furthermore, there is a problem that the measurement time of the computer and the time until the rotation speed is determined increase or decrease depending on the rotation speed of the rotating body. Since the processing in the computer is controlled on the assumption that the rotation speed is regularly updated, if the calculation end time of the rotation speed changes depending on the rotation speed, the processing in the computer becomes complicated. Therefore, this method is not generally used.

  In addition, as an alternative means of a rotation sensor that cannot detect rotation at low rotation, information of another control unit is also used.

  For example, the transmission may use ABS (Antilock Brake System) vehicle speed information or navigation system position information as an alternative to output shaft rotation.

  However, when using signals from other control units, the information cannot be obtained in real time due to the communication time lag, and the resolution and accuracy of the substitute signal is different from the information at the position where measurement is originally desired. It cannot be used and is only used as reference information.

  As another solution, the rotation speed is estimated from other information that is not dynamically connected to the rotation. For example, the output shaft rotation is estimated from torque information and elapsed time. However, since the referenced signal and the rotational speed are not dynamically connected by a gear or the like, the correlation between the estimated value and the actual rotational speed is low. As a result, the difference from the actual rotational speed becomes large, and this can only be used as reference information.

  Therefore, when the edge of the pulse signal has not been detected, a method has been proposed for estimating the rotational speed during the period in which the edge is not detected from the temporal change in the rotational speed while the edge of the pulse signal is detected. Yes. (For example, see Patent Document 1)

JP 2009-222601 A

  In order for the transmission to reduce fuel consumption and achieve an optimal shift time, a control unit that controls the transmission needs to optimally control the actuator. For this purpose, it is desirable that the transmission control unit be able to grasp the behavior of elements inside the transmission in real time, instead of using alternative means or estimated values.

  The calculation method described in Patent Document 1 estimates the rotation speed at the present time from the change in the rotation speed while the previous edge is detected even if the rotation sensor cannot detect the edge at low rotation. It is. However, since this is an estimated value and not an actual measured value, it cannot be said to be strictly real-time rotational speed information.

  Similarly, even when an alternative signal or another rotation signal is used, it is not a measured value of the rotating body, so this cannot be said to be an accurate rotation speed. In order to grasp the accurate rotation speed, it is ideal to use a value measured directly from the measurement object.

  An object of the present invention is to provide a rotational speed measuring device, a transmission control system, and a program capable of detecting a rotational speed even when the rotation of a rotating body is low.

  In order to achieve the above object, the present invention detects an unevenness of a rotating body, detects a first rotation sensor that outputs a first signal corresponding to the unevenness, detects the unevenness of the rotating body, A second rotation sensor that outputs a second signal corresponding to the unevenness, a distance between the first rotation sensor and the second rotation sensor, and a phase difference between the first signal and the second signal. And a control device having a first calculation unit for calculating the rotation speed of the rotating body.

  According to the present invention, the rotation speed can be detected even when the rotation of the rotating body is low. Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

1 is an overall configuration diagram of a rotational speed measurement device according to a first embodiment of the present invention. Of the entire configuration of the rotational speed measuring apparatus according to the first embodiment of the present invention shown in FIG. FIG. It is the figure which showed the output waveform of the conventional system which measures rotation with one rotation sensor, and its structure. It is the figure which showed the output waveform of the rotation sensor 4 and the rotation sensor 5 which were shown in FIG.1 and FIG.2 in case the gearwheel is rotating at fixed speed. It is a flowchart which shows the process which the computer of the rotational speed measuring device by the 1st Embodiment of this invention performs. It is the figure which showed the output waveform of the rotation sensor 4 and the rotation sensor 5 which were shown in FIG. 1 and FIG. It is a flowchart which shows the process which the computer of the rotational speed measuring device by the 2nd Embodiment of this invention performs. It is the figure which showed each output waveform when the rotation sensor 4 is normal, the sensor 5 fails, and the output value from another device is also normal. It is a schematic block diagram (schematic diagram) of a transmission control system including a transmission provided with a rotational speed measurement device according to the first or second embodiment of the present invention.

  Hereinafter, the configuration and operational effects of the rotational speed measurement device according to the first to second embodiments of the present invention will be described with reference to the drawings. In each figure, the same numerals indicate the same parts.

(First embodiment)
Initially, the rotational speed measuring device by the 1st Embodiment of this invention is demonstrated using FIGS.

  In the present embodiment, a plurality of rotation sensors that detect unevenness on the surface of a rotating body (such as a gear used in a vehicle) are used, and the rotation is detected based on the detection time difference between the plurality of rotation sensors that detect the same edge on the surface of the rotating body. Calculate body rotation speed.

  FIG. 1 is an overall configuration diagram of a rotational speed measuring device 100 according to a first embodiment of the present invention. The rotation speed measuring device 100 mainly includes a rotation sensor 4 (first rotation sensor), a rotation sensor 5 (second rotation sensor), a signal processing circuit 6, and a computer 8 (control device).

  Here, the rotating body 1 is a spur gear as an example. The surface of the gear has a convex portion 2 and a concave portion 3. In this embodiment, there are two rotation sensors (rotation sensor 4 and rotation sensor 5), which are arranged side by side in the rotation direction of the gear.

  The specifications of the rotation sensor 4 and the rotation sensor 5 are the same, and each output signal is converted into a pulse signal by the signal processing circuit 6 and sent to the computer 8 through the signal line 7. In addition, the system which the rotation sensors 4 and 5 detect the unevenness | corrugation of the rotary body 1 is arbitrary, For example, rotation sensors, such as an optical type and an electromagnetic induction type, can be used.

  The computer 8 determines the rising edge and the falling edge from the voltage threshold values of the pulse signals of the rotation sensor 4 and the rotation sensor 5. Further, the computer 8 measures the number of times of each edge by an internal counter function and the interval of each edge by a timer function.

  FIG. 2 shows the positional relationship between the rotation sensor 4 and the rotation sensor 5 and the rotary body 1, the rotation sensor 4 and the rotation of the overall configuration of the rotation speed measuring apparatus 100 according to the first embodiment of the present invention shown in FIG. It is the figure which showed the distance between the axes of the sensor.

  The distance between the axes of the rotation sensor 4 and the rotation sensor 5 is known and is set to d. The radius of the tooth tip circle from the rotation center 9 of the gear to the tooth tip is r.

  Here, the rotation sensor 4 (first rotation sensor) and the rotation sensor 5 (second rotation sensor) are arranged so as to be parallel to one diameter of the rotating body. Thereby, positioning of the rotation sensors 4 and 5 becomes easy. The rotation sensor 4 (first rotation sensor) and the rotation sensor 5 (second rotation sensor) may be arranged so as to be rotationally symmetric with respect to the center of rotation of the rotating body. Thereby, the detection precision of the unevenness | corrugation of the rotary body 1 improves.

  The distance between the rotation sensor 4 and the rotation sensor 5 is smaller than the width in the circumferential direction (rotation direction) of the convex portion 2 or the concave portion 3 of the rotating body 1. This shortens the time until the rotational speed of the rotating body 1 is calculated using this distance.

  Assuming that the gear 1 rotates to the right, a certain edge of the gear is first detected by the rotation sensor 4 and then detected by the rotation sensor 5. Output pulses of the rotation sensor 4 and the rotation sensor 5 are sent to the computer 8 via the signal processing circuit 6, respectively, where the rotation speed is calculated.

  FIG. 3 is a diagram showing a conventional system for measuring rotation with one rotation sensor and an output waveform of the rotation sensor in the configuration. Assuming that the number of gear teeth is N, the number of pulses detected by the rotation sensor within a predetermined time is n, and the period of the pulse is t, the time required for one rotation of the gear is (N · t) / n. The rotational speed of the gear can be calculated from this equation.

  FIG. 4A is a diagram illustrating output waveforms of the rotation sensor 4 and the rotation sensor 5 illustrated in FIGS. 1 and 2 when the gear is rotating at a constant speed. Here, as shown in FIG. 2, since the gear rotates clockwise in the direction of the arrow, even when the same edge of the gear is detected, a time difference occurs between the rotation sensor 4 and the rotation sensor 5, and the rotation sensor 4 A pulse signal is output before the rotation sensor 5. The time from the rise of the rotation sensor 4 to the rise of the rotation sensor 5 is defined as time t1. The time t1 is calculated by the computer 8 based on the output pulse signals of the rotation sensor 4 and the rotation sensor 5.

  Since the distance between the axes of the rotation sensor 4 and the rotation sensor 5 is d and the tooth tip circle radius is r, the time required for one rotation of the gear is (2π · r · t1) / d. The rotational speed of the gear can be calculated from this equation. A distance d (distance between axes) and a tip circle radius r between the rotation sensor 4 and the rotation sensor 5 are stored in advance in a storage unit (storage device) such as a memory of the computer 8, for example.

  Here, the computer 8 (control device) executes a predetermined program to output the distance between the rotation sensor 4 (first rotation sensor) and the rotation sensor 5 (second rotation sensor) and the rotation sensor 4. Based on the phase difference between the pulse signal (first signal) to be output and the pulse signal (second signal) output from the rotation sensor 5, functions as a first calculation unit that calculates the rotation speed of the rotating body 1. . Thereby, even if rotation of the rotary body 1 is low speed, a rotational speed is detectable.

  The computer 8 functions as a device control unit that controls the in-vehicle device based on the rotational speed of the rotating body 1. Thereby, control of the vehicle-mounted apparatus according to the rotational speed of the rotary body 1 can be performed accurately.

  The time t1 is output from the pulse of the pulse signal (first signal) output from the rotation sensor 4 corresponding to one tooth of the rotating body 1 (gear) and from the rotation sensor 5 corresponding to the one tooth. This corresponds to the pulse phase difference of the pulse signal (second signal).

  Here, the time t1 is a period from the rising edge of the pulse of the first signal corresponding to one tooth of the gear to the rising edge of the pulse of the second signal corresponding to the one tooth. It may be a period from the fall of the pulse of the first signal corresponding to the tooth to the fall of the pulse of the second signal corresponding to the one tooth.

  In the conventional method of measuring the rotation speed with one rotation sensor, time t2 (t5 in the case of a falling edge), time t3, or time t4 is required within a certain period measured by the computer. However, t2 is one time interval from the rising edge to the next rising edge, and a plurality of time intervals are generally used for error reduction.

  In the present embodiment, as shown in FIG. 3, the rotation speed can be calculated using a time t1 shorter than the minimum required time t2 in the conventional method. Since the pulse interval becomes longer at low rotation, the ability to measure time in a shorter period than the conventional method means that measurement at low rotation is possible.

  Similarly, even when the falling edge time t6 is used, measurement at a low rotation speed is possible.

  Furthermore, the detection accuracy can be improved by combining the rotation calculation result by only the time t2 by the rotation sensor 4 and the rotation calculation result by the time t1 and the time t5 measured by the combination of the rotation sensor 4 and the rotation sensor 5. .

  For example, the computer 8 (control device) rotates based on one of the pulse signal (first signal) output from the rotation sensor 4 and the pulse signal (second signal) output from the rotation sensor 5. It functions as a second calculation unit that calculates the rotation speed of the body 1. When the rotation speed of the rotating body 1 calculated by the second calculation unit is equal to or lower than a predetermined threshold value (low speed), the computer 8 determines the distance d between the rotation sensor 4 and the rotation sensor 5 and the first signal and the first signal. Based on the phase difference t1 of the two signals, it functions as a first calculator that calculates the rotational speed of the rotating body 1.

  Next, processing of the computer 8 will be described with reference to FIG. FIG. 4-2 is a flowchart illustrating a process executed by the computer 8 of the rotational speed measurement device 100 according to the first embodiment of the present invention. The computer 8 executes the following process by executing a predetermined program.

  The computer 8 receives the first signal and the second signal corresponding to the unevenness of the rotating body from the rotation sensors 4 and 5, respectively (step S10).

  The computer 8 reads the inter-axis distance d between the rotation sensor 4 and the rotation sensor 5 and the gear tip radius r from the storage unit (step S20).

  The computer 8 calculates the rotational speed of the rotating body using the formula (2π · r · t1) / d (step S30). Specifically, the computer 8 calculates the phase difference t1 between the first signal and the second signal received in step S10. Then, the computer 8 calculates the rotation speed based on the values obtained by substituting the inter-axis distance d and the gear tip radius r of the rotation sensor 4 and the rotation sensor 5 read in step S20 into the above formula.

  As described above, according to the present embodiment, the rotational speed can be detected even when the rotating body 1 rotates at a low speed.

(Modification)
FIG. 5 is a diagram showing output waveforms of the rotation sensor 4 and the rotation sensor 5 shown in FIGS. 1 and 2 when the rotation of the gears is increasing.

  In order to judge the acceleration or deceleration of rotation, in the conventional method, it is necessary to measure t11 and t12 for at least two teeth and compare the magnitudes.

  However, in this method, acceleration / deceleration can be determined by comparing t41 and t42, and detection can be performed in a shorter time than in the past.

  If the time from the fall of the rotation sensor 4 to the fall of the rotation sensor 5 is t51, the rotation (speed) increases when t41 <t51, and the rotation (speed) decreases when t41> t51. In this case as well, it can be detected in a shorter time than before.

  Here, the computer 8 (control device) starts the pulse signal (second signal) output from the rotation sensor 5 corresponding to the rising edge of one pulse of the pulse signal (first signal) output from the rotation sensor 4. Signal) at a first period t41 until the rise of one pulse, and a second period from the fall of the one pulse of the first signal to the fall of the one pulse of the corresponding second signal. It functions as a rotation speed increase / decrease determination unit that determines increase / decrease in the rotation speed of the rotating body based on the period t51. Thereby, increase / decrease in the rotational speed of the rotary body 1 can be determined in a short time.

  The computer 8 may function as a device control unit that controls the in-vehicle device based on the increase / decrease in the rotation speed of the rotating body 1 determined by the rotation speed increase / decrease determination unit. Thereby, the responsiveness of the control according to the increase / decrease in the rotational speed of the rotating body 1 is improved.

(Second Embodiment)
Next, the rotational speed measuring device 100 according to the second embodiment of the present invention will be described with reference to FIGS. In this embodiment, compared with the first embodiment, when one of the rotation sensor 4 and the rotation sensor 5 is abnormal (failure), the speed of the rotating body 1 is adjusted using the other normal rotation sensor. Detect. FIG. 6 is a flowchart showing processing executed by the computer 8 of the rotational speed measurement device 100 according to the second embodiment of the present invention, and includes alternative processing when the rotation sensor 4 or the rotation sensor 5 is abnormal.

  The abnormality determination uses three rotation signals (the rotation sensor 4, the rotation sensor 5, and another device). In the computer 8, when other device signals are normal and the signal of the rotation sensor 4 is input even though the signal of the rotation sensor 4 is fixed to ON or OFF, the rotation sensor 4 Judge that it is broken. In this case, the computer 8 uses the signal of the rotation sensor 5 to calculate the rotation speed by the conventional method shown in FIG. The same applies when the rotation sensor 5 is out of order.

  When both are normal, the rotation speed is measured by the time difference between the two sensors shown in FIG. On the other hand, if both are abnormal, the rotation speed is substituted with a signal from another device.

  Here, the computer 8 (control device) includes a receiving unit (communication device) that receives an output signal corresponding to the rotational speed of the rotating body 1 from a device different from the own device. In the computer 8, an output signal indicating that the rotating body 1 is rotating is input from another device, a pulse signal (first signal) output from the rotation sensor 4 is a constant value, and the rotation sensor When the pulse signal (second signal) output from 5 includes a pulse corresponding to the unevenness of the rotating body 1, it functions as a failure determination unit that determines that the failure is the first failure.

  The computer 8 receives an output signal indicating that the rotating body 1 is rotating from another device, the first signal is a constant value, and the second signal is a constant value. It also functions as a failure determination unit that determines that it is the second failure.

  The computer 8 calculates a rotational speed of the rotating body 1 based on an output signal from a third calculation unit that calculates the rotational speed of the rotating body 1 based on the second signal or an output signal from another device. It functions as the calculation part. The computer 8 calculates (identifies) the rotational speed of the rotating body from the output signals from other devices, for example, using a map or function indicating the correspondence between the value of the output signal and the rotational speed of the rotating body 1. Thereby, even if the rotation sensor 4 or 5 is abnormal, the rotation speed can be calculated.

  In addition, when it determines with it being a 1st failure, the computer 8 functions as an apparatus control part which controls a vehicle-mounted apparatus based on the rotational speed of the rotary body calculated by the 3rd calculation part. Moreover, when it determines with it being a 2nd failure, the computer 8 functions as an apparatus control part which controls a vehicle-mounted apparatus based on the rotational speed of the rotary body calculated by the 4th calculation part. Thereby, fail safe can be realized.

  FIG. 7 shows the output waveforms of the rotation sensor 4 and the rotation sensor 5 as well as other device signals that can be used to estimate that the gear is rotating as reference information. Here, a state is shown in which the rotation sensor 5 has failed and the signal output has a constant value.

  When the computer 8 outputs a pulse from the rotation sensor 4 and the output waveform of the rotation sensor 5 is fixed to ON or OFF, and the other device is normal and the signal is output, the rotation sensor 4 is normal, It is determined that the rotation sensor 5 has failed. In this case, the computer 8 does not use the output signal of the rotation sensor 5 for calculation of the rotation speed, but calculates the rotation speed only by the output of the rotation sensor 4.

  Conversely, the computer 8 detects an output pulse in the rotation sensor 5, but the output waveform of the rotation sensor 4 is fixed to ON or OFF, and the output value of another device is output (normal and the signal is If the rotation sensor 4 is out, the rotation sensor 4 is determined to be out of order, and the rotation speed is calculated using only the waveform of the rotation sensor 4.

  In this case, calculation of the rotation speed due to the time difference between the rotation sensor 4 and the rotation sensor 5 described above becomes impossible and detection at low rotation is impossible, but the same measurement as the conventional method is possible, so the function as a rotation sensor is It is possible to fulfill.

  As described above, according to the present embodiment, the rotational speed can be detected even when the rotating body 1 rotates at a low speed. Moreover, even if one of the rotation sensors 4 and 5 fails, the rotation speed of the rotating body 1 can be detected.

(Application example to transmission)
Next, an example of application to a transmission will be described with reference to FIG. FIG. 8 is a schematic configuration diagram (schematic diagram) of a transmission control system 200 including the transmission 11 provided with the rotational speed measuring device 100 according to the first or second embodiment of the present invention.

  The transmission control system 200 mainly includes a transmission 11 and a rotation speed measuring device 100 that change a gear ratio according to the displacement amount of the actuator.

  An input shaft 13 of the transmission 11 is connected to the engine 10. On the other hand, the output shaft 15 of the transmission 11 is connected to the drive shaft 16. As shown in FIG. 2, the rotational speed measuring device 100 is installed in the vicinity of the rotating body 1 (gear) fixed to the output shaft 15 of the transmission 11.

<First issue>
In the conventional transmission, when the rotation of the output shaft is low, the rotation speed of the output shaft cannot be measured, and information on the estimated rotation speed and other control units is used for controlling the transmission. For this reason, there are cases where accurate control of the transmission cannot be performed.

  For example, in a transmission in which the transmission gear ratio, which is the ratio between output shaft rotation and input shaft rotation, continuously changes and the torque transmission element is controlled using a motor or hydraulic pressure, such as a continuously variable transmission, the torque transmission element is Control using the gear ratio. Therefore, it is necessary to accurately measure the input rotation and the output shaft rotation.

  However, in the conventional method of calculating the rotation speed of the output shaft from the pulse signal of one rotation sensor, since the output shaft rotation cannot be calculated in the low speed region, the gear ratio cannot be calculated. Therefore, in the region where the output shaft rotation cannot be calculated, the control amount is calculated by using the output shaft rotation information of another device as a substitute signal or by setting the speed ratio to a constant value. Therefore, the torque transmission element cannot be accurately controlled.

<Second problem>
In the control for determining the start (or end) in the low speed region, conventionally, the number of rotations at which the rotation speed can be detected is used as the determination threshold value. For this reason, the threshold used for determination may not be set to a low speed.

  For example, when detecting a slip while stopping on the way uphill and controlling the hydraulic pressure of the transmission to prevent the slip (hill hold function), other devices such as ABS can I depended on the signal of, or used an acceleration sensor. This is because when the vehicle slides uphill, the rotation of the output shaft of the transmission is extremely low, and the conventional method of calculating the rotation speed of the output shaft from the pulse signal of one rotation sensor cannot detect the rotation speed. .

<Action>
FIG. 8 shows an example of mounting positions of the rotation sensors 4 and 5 for detecting the output shaft rotation (speed) of the transmission. The rotation sensors 4 and 5 in this figure measure the rotation of the gear directly connected to the output shaft rotation of the transmission.

  Depending on the type of transmission, the output shaft may not be measured directly, but the rotation of another shaft meshing with the output shaft by a gear may be measured. The input shaft rotation is engine rotation and is measured directly or using the CAN signal of engine rotation. The transmission gear ratio is obtained from the ratio between the input shaft rotation and the output shaft rotation.

  Further, since the rotation of the output shaft 15 is transmitted to the tire 18 via the drive shaft 16 and the differential gear 17, the vehicle speed can also be obtained by measuring the output shaft rotation.

  Here, the computer 8 (control device) determines the distance between the rotation sensor 4 (first rotation sensor) and the rotation sensor 5 (second rotation sensor) and the pulse signal (first signal) output from the rotation sensor 4. ) And the pulse signal (second signal) output from the rotation sensor 5 functions as a first calculation unit that calculates the rotation speed of the output shaft 15.

  Further, the computer 8 functions as a gear ratio calculation unit that calculates the gear ratio from the ratio of the rotational speeds of the input shaft 13 of the transmission 11 and the output shaft 15 of the transmission 11. The computer 8 functions as an actuator controller that controls the actuator based on the gear ratio calculated by the gear ratio calculator.

  Note that the computer 8 may function as a falling detection unit that detects a vehicle falling from the rotation speed of the output shaft 15 calculated by the first calculation unit. In addition, the computer 8 may function as a shift range changing unit that changes the shift range from the neutral range to the drive range when the vehicle slip is detected and the shift range is the neutral range. .

<Effect>
According to this application example, even when the rotation of the output shaft 15 is low, the rotation (speed) can be accurately measured by the own control unit (transmission control control unit). As a result, fuel efficiency and driving performance are expected to be improved by using an accurate rotational speed for low-speed control.

  Further, since the extremely low output rotation that could not be calculated up to now can be detected, the torque transmission element can be controlled even in a low speed region, for example, when starting from a stop, thereby improving the start performance of the vehicle.

  Further, in the control for determining the start (or end) in the low speed region, the threshold used for the determination can be set to be lower than in the conventional case. Thereby, for example, in the hill hold function, it is possible to detect the start of rotation of the output shaft (or the axle) of the transmission. Therefore, it is possible to shift to the sliding prevention control as soon as possible, and the safety is improved.

  As described above, by using a plurality of rotation sensors, it is possible to detect a low rotation that could not be detected by one.

  In addition, this invention is not limited to above-described embodiment, Various modifications are included. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment. In addition, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  In the above embodiment, the rotation sensors 4 and 5 output a pulse signal via the signal processing circuit 6, but may output a signal such as a sine wave (cosine wave).

  In the above embodiment, the computer 8 calculates the rotational speed of the rotating body 1 (gear) based on the time (2π · r · t1) / d required for one revolution of the gear. The rotational speed may be calculated based on the speed d / t1 when moving by d.

  Further, each of the above-described configurations, functions, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit. Information such as programs, tables, and files for realizing each function can be stored in a recording medium such as a memory.

DESCRIPTION OF SYMBOLS 1 ... Rotating body 2 ... Rotating body surface Convex part 3 ... Rotating body surface Concave part 4 ... Rotation sensor 5 ... Rotation sensor 6 ... Signal processing circuit 7 ... Signal line 8 ... Computer (rotation speed calculation process)
9 ... Gear rotation center 10 ... Engine 11 ... Transmission 13 ... Input shaft 14 ... Rotating body (gear)
DESCRIPTION OF SYMBOLS 15 ... Output shaft 16 ... Drive shaft 17 ... Differential gear 18 ... Tire 100 ... Rotational speed measuring device 200 ... Transmission control system d ... Center distance r of the rotation sensor 4 and the rotation sensor 5 ... Gear tooth tip radius,
t1 ... Detection time difference t2 of the rising edge of the rotation sensor 4 and the rotation sensor 5 ... Detection period t3 of one gear using the rising edge of the rotation sensor 4 ... ON time t4 of the output pulse of the rotation sensor 4 ... Output pulse OFF time t5... Detection period t6 for one gear tooth using the falling edge of the rotation sensor 4... Detection time difference t7 for the falling edge of the rotation sensor 4 and the rotation sensor 5. Detection cycle

Claims (15)

A first rotation sensor that detects irregularities of the rotating body and outputs a first signal corresponding to the irregularities;
A second rotation sensor that detects the unevenness of the rotating body and outputs a second signal corresponding to the unevenness;
A first calculator that calculates a rotational speed of the rotating body based on a distance between the first rotation sensor and the second rotation sensor and a phase difference between the first signal and the second signal; A control device comprising:
A rotational speed measuring device comprising: The rotational speed measuring device according to claim 1,
The first and second rotation sensors are
The rotational speed measuring device is arranged so as to be parallel to one diameter of the rotating body. The rotational speed measuring device according to claim 1,
The first and second rotation sensors are
The rotational speed measuring device is arranged so as to be rotationally symmetric with respect to the center of rotation of the rotating body. The rotational speed measuring device according to claim 1,
The distance between the first rotation sensor and the second rotation sensor is:
The rotational speed measuring device characterized by being smaller than the circumferential width of the convex portion or concave portion of the rotating body. The rotational speed measuring device according to claim 1,
The controller is
A second calculator that calculates a rotational speed of the rotating body based on one of the first to second signals;
The first calculation unit includes:
When the rotation speed of the rotating body calculated by the second calculation unit is equal to or less than a predetermined threshold, the distance between the first rotation sensor and the second rotation sensor, the first signal, and the second A rotation speed measuring device that calculates a rotation speed of the rotating body based on a phase difference of the signal. The rotational speed measuring device according to claim 1,
The controller is
A rotation speed measurement device comprising: a device control unit that controls an in-vehicle device based on a rotation speed of the rotating body. The rotational speed measurement device according to claim 6,
The first and second signals are pulse signals;
The controller is
A first period from the rising edge of one pulse of the first signal to the rising edge of the corresponding one pulse of the second signal, and the falling edge of the one pulse of the first signal. A rotation speed increase / decrease determination unit that determines increase / decrease in the rotation speed of the rotating body based on a second period until the fall of the one pulse of the second signal corresponding to
The device controller is
A rotational speed measuring device comprising: controlling the in-vehicle device based on increase / decrease in rotational speed of the rotating body determined by the rotational speed increase / decrease determination unit. The rotational speed measurement device according to claim 6,
The first and second signals are pulse signals;
The controller is
A receiving unit that receives an output signal corresponding to a rotation speed of the rotating body from a device different from the control device;
When the output signal indicating that the rotating body is rotating is input, the first signal is a constant value, and the second signal includes a pulse corresponding to the unevenness of the rotating body, A failure determination unit that determines that the failure is a first failure;
A third calculator that calculates the rotational speed of the rotating body based on the second signal;
The device controller is
When it is determined that the first failure has occurred, the in-vehicle device is controlled based on the rotation speed of the rotating body calculated by the third calculation unit. The rotational speed measuring device according to claim 8,
The controller is
A fourth calculator for calculating a rotation speed of the rotating body based on the output signal;
The failure determination unit
When the output signal indicating that the rotating body is rotating is input, the first signal is a constant value, and the second signal is a constant value, it is a second failure. Judgment,
The device controller is
When it is determined that the second failure has occurred, the in-vehicle device is controlled based on the rotation speed of the rotating body calculated by the fourth calculation unit. The rotational speed measuring device according to claim 1,
The rotating body is a gear;
The first and second signals are pulse signals;
The distance between the first rotation sensor and the second rotation sensor is d, the tooth tip circle radius of the gear is r, the pulse of the first signal corresponding to one tooth of the gear and the one tooth. In the case where the phase difference of the corresponding pulse of the second signal is t1,
The first calculation unit includes:
A rotational speed measuring device, wherein the time required for one rotation of the gear is calculated using the formula (2π · r · t1) / d, and the rotational speed of the rotating body is calculated from the calculated time. The rotational speed measuring device according to claim 10,
The phase difference t1 is
A period from a rising edge of the pulse of the first signal corresponding to one tooth of the gear to a rising edge of the pulse of the second signal corresponding to the one tooth; or
Rotational speed measurement characterized by a period from a fall of the pulse of the first signal corresponding to one tooth of the gear to a fall of the pulse of the second signal corresponding to the one tooth apparatus. A transmission that changes the gear ratio according to the amount of displacement of the actuator;
A rotating body fixed to the output shaft of the transmission and having irregularities formed thereon;
A first rotation sensor that detects irregularities of the rotating body and outputs a first signal corresponding to the irregularities;
A second rotation sensor that detects the unevenness of the rotating body and outputs a second signal corresponding to the unevenness;
A first calculation unit for calculating a rotation speed of the output shaft based on a distance between the first rotation sensor and the second rotation sensor and a phase difference between the first signal and the second signal; A gear ratio calculation unit that calculates a gear ratio from a ratio of rotational speeds of the input shaft of the transmission and the output shaft of the transmission, and the actuator is controlled based on the gear ratio calculated by the gear ratio calculation unit A control device having an actuator controller;
A transmission control system comprising: The transmission control system according to claim 12,
The controller is
The transmission control system according to claim 1, further comprising a slip detection unit that detects a slip of the vehicle from the rotation speed of the output shaft calculated by the first calculation unit. The transmission control system according to claim 13,
The controller is
A transmission control system, further comprising: a shift range changing unit that changes the shift range from the neutral range to the drive range when the vehicle slippage is detected and the shift range is the neutral range. Receiving a first signal and a second signal respectively corresponding to the unevenness of the rotating body from the first and second rotation sensors;
Reading a distance between the first rotation sensor and the second rotation sensor from a storage unit;
Calculating a rotation speed of the rotating body based on a distance between the first rotation sensor and the second rotation sensor and a phase difference between the first signal and the second signal;
A program characterized by causing a control device to execute.

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