JPH0614066B2 - Rotation state detection device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rotation state detection device which is suitable for detecting the rotation state of a kickdown drum or the like in an automobile transmission or the like.

[Conventional technology]

Conventionally, in a vehicle, a pulse generator is installed in the upper part of the transmission, pulses P at equal time intervals as shown in FIG. 4 are generated to detect the rotation speed of the kickdown drum, and various values of the vehicle are detected based on the detected values. Is controlled.

[Problems to be solved by the invention]

By the way, in the case of such a means, since the rotation direction of the kickdown drum cannot be detected, it is not possible to detect the shift state of the automobile (how fast the vehicle is currently driven), and the pulse generator attached to the kickdown drum cannot be detected. However, there is a problem in that it is not possible to carry out a reliable shift control by only using this.

That is, since the forward rotation, the reverse rotation, and the stopped state of the kickdown drum correspond to the respective shift stages of the automobile, the shift state (current shift stage) is detected by detecting the rotation direction of the kickdown drum. However, the detection of the rotation direction is an important problem because reliable gear shift control is performed by an inexpensive device.

The present invention is intended to solve such a problem, and an object of the present invention is to provide a rotation state detection device capable of detecting the rotation direction as well as the rotation speed of a rotating body.

[Means for solving problems]

Therefore, in the rotation state detecting device of the present invention, the rotation detecting body that rotates together with the rotating body and the series of rotation angle intervals having at least three types of predetermined rotation angle intervals that sequentially increase in one rotation direction are repeated. A plurality of signal generating means provided on the surface of the rotation detecting body so as to be formed by the above, and a detection signal is output each time the signal generating means is provided at a position facing the rotation detecting body and passes through the vicinity thereof. Rotation detecting sensor, a time measuring means for receiving a detection signal from the rotation detecting sensor to measure a time from an arbitrary signal generating means to another signal generating means, and an arbitrary receiving a measurement result of the time measuring means. The rotation speed of the rotating body is detected from the time from one signal generating means existing in the rotation interval group to the signal generating means corresponding to the one signal generation means in the next rotation angle interval group Each other among the signal generating means time required for each of the four rotation angles between successive starting from the _{t 1, t 2, t 3} , t 4 required time calculated of the _{t 1, t 2, t 3} , t 4 By comparing adjacent ones, three rotation angle interval time differences t ₂ -t ₁ ,, t ₃ -t ₂ ,, t ₄
-t ₃ is provided with a rotation detecting means for identifying the rotation direction of the rotating body when the number of positives is two or more and when the number of positives is one or less.

[Action]

In the above-described rotation state detecting device of the present invention, in response to the measurement result of the measuring means, one signal generating means of one rotation angle interval group corresponds to the one signal generating means of the next rotation angle interval group. with the detection of the rotational speed of the rotating body from time to means is performed, the time required t ₁ of each of the four rotation angles between successive starting any signal generating means, t _2, t _3, t
₄ is calculated, and adjacent ones of these required times t ₁ , t ₂ , t ₃ , t ₄ are compared, and three rotation angle interval time differences t ₂ -t
_{When 1} , t ₃ -t ₂ , t ₄ -t ₃ has two or more positive numbers, the positive number is 1.
The direction of rotation of the rotating body is identified depending on when the number of rotations is less than or equal to one.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show a rotation state detecting device as an embodiment of the present invention, and FIG. 1 is a schematic view showing the entire configuration thereof, and FIG. (a) and (b) are schematic diagrams showing the pulse, respectively.
The figure is a flow chart showing the arithmetic operation of the computer.

As shown in FIG. 1, a pulse generator 2 as a rotation detecting sensor is attached to a bottomed cylindrical kickdown drum 1 provided in a transmission of an automobile so as to face a peripheral surface of the cylindrical portion. ing.

The kickdown drum 1 is configured to rotate normally, reversely, and stop in correspondence with the shift speed of the automobile, and is configured as a rotating body whose rotational state should be detected.

Further, the kickdown drum 1 is configured as a rotation detecting body, and has a hole 4 as a pulse generating portion for generating a pulse in the pulse generator 2.

The holes 4 are arranged at every required rotation angle with respect to the rotation center of the kickdown drum 1.

The intervals between the holes 4 correspond to three types of rotation angles such that the rotation angle of the kickdown drum 1 is 1: 2: 4, and the intervals corresponding to 1: 2: 4 are. This sequence is repeated.

That is, the pulse generator 2 faces the hole 4 by the rotation of the kickdown drum 1 at every rotation time corresponding to the interval corresponding to 1: 2: 4.

A magnetic flux is formed in the pulse generator 2, and the magnetic flux of the pulse generator 2 changes depending on whether it faces the hole 4 or the circumferential surface of the cylindrical portion of the kickdown drum 1. Since a pulse is generated, a pulse is generated every time the hole 4 and the pulse generator 2 face each other, and a pulse train as shown in FIG. 1 is obtained.

This pulse train is input to the computer 3 and processed in accordance with the flowchart shown in FIG. 3 to calculate the rotation speed and rotation direction of the kickdown drum 1.

The pulses generated in the pulse generator 2 are generated at a time interval of 1: 2: 4 when the kickdown drum 1 is rotated at a constant speed. A continuous increase in two sections for two pulses and a subsequent decrease in one section are repeated.

That is, during reverse rotation, a continuous decrease of two sections for two pulses and a subsequent increase of one section are repeated, and a section in which the time interval continuously increases during forward rotation or reverse rotation. The number and the number of sections in which the time interval decreases continuously are formed so as not to coincide with each other, and the rotation direction of the kickdown drum 1 is detected by detecting the difference between the forward rotation and the reverse rotation. The computer 3 is configured.

Since the rotation state detecting device as one embodiment of the present invention is configured as described above, when the kickdown drum 1 rotates during driving of the automobile, the holes 4 arranged with the interval of 1: 2: 4 are displaced. And sequentially pulse generator 2
To face.

When the pulse generator 2 faces the hole 4, a pulse is generated and input to the computer 3.

The pulse train input to the computer 3 is as shown in FIG. 2 (a) when the kickdown drum 1 is in forward rotation, and as shown in FIG. 2 (b) when it is in reverse rotation.

That is, in the case of forward rotation, the pulse train is repeated at intervals of 1: 2: 4, and in the case of reverse rotation, the pulse train is repeated at intervals of 4: 2: 1.

Such a pulse train is input to the computer 3 and
The calculation is performed according to the flowchart shown in the figure.

That is, when the pulse P ₁ is input to the computer 3,
In step S1, the YES route is taken and step S
At 2, T in the timer is set to 0.

Next, when the pulse P ₂ is input to the computer 3, the YES route is taken in step S3, the elapsed time T of the timer at that time is measured, and T is stored as T ₁ (step S4).

When the pulse P ₃ is input to the computer 3, the YES route is taken in step S5, the timer elapsed time T at that time is measured, and T is stored as T ₂ (step S6).

Further, when the pulse P ₄ is input to the computer 3, the YES route is taken in step S7, the timer elapsed time T at that time is measured, and T is stored as T ₃ (step S8).

Next, when the pulse P ₅ is input to the computer 3, the YES route is taken in step S9, the timer elapsed time T at that time is measured, and T is stored as T ₄ (step S10).

In this state, in step S11, the rotation speed N of the kickdown drum 1 is calculated by N = 60 / P · T ₃ (rpm) P: total number of holes 4/3 by the above formula.

Then, in step S12, the elapsed time between each pulse of the pulse P ₁ to P ₅ is computed by the following equation.

ΔTa = T ₂ −T ₁ ΔTb = T ₃ −T ₂ ΔTc = T ₄ −T _{3 Based on} this calculation result, steps S13 to S19 are executed, and the kickdown drum 1 in step S18 is executed.
Is output from the computer 3 as a result of normal rotation, or the result of reverse rotation of the kickdown drum 1 in step S19.

That is, in the case of forward rotation, the pulses P ₁ and P ₂ are 1:
If it starts from the interval corresponding to 1 of 2: 4, it corresponds to the code (1) shown in FIG. 2 (a), and ΔTa increases from T ₁ and ΔTb increases from ΔTa, so step S13 , The result of step S18 is obtained through the route of step S14, and normal rotation is output.

In the case of forward rotation, the pulses P ₁ and P ₂ are 1:
When it starts from the interval corresponding to 2 or 4 of 2: 4, it corresponds to the code (2) or (3) shown in FIG. 2 (a). Among these, in the case of the code (2), since the elapsed time between pulses increases, decreases, or increases, steps S13 and S1
Forward rotation is output through the route of S4 and S15.

Further, in the case of the code (3), since the elapsed time between pulses is decreasing, increasing, or increasing, forward rotation is output in step S18 through the routes of steps S13, S16, and step S17.

On the other hand, in the case of the reverse rotation of the kickdown drum 1, FIG.
As shown in (b), the code is one of the codes (4), (5), and (6), but in the case of the code (4), the reverse rotation is output through the route of steps S13 and S16 through step S19. .

In the case of the code (5), the reverse rotation is output in step S19 through the routes of steps S13, S16, and S17.

In the case of the code (6), the reverse rotation is output in step S19 through the routes of steps S13, S14 and S15.

In this way, the rotation speed N of the kickdown drum 1
, And either normal or reverse rotation is output from the computer 3.

As described above, it is possible to determine whether the rotation is normal or reverse by paying attention to the increase or decrease of the pulse interval, and to compare the adjacent pulse intervals to detect the rotation direction from the time difference of the three rotation angle intervals.

That is, as shown in FIGS. 2 (a) and 2 (b), the time required from the generation of the pulse P _{1 to} the generation of the pulse P ₂ is t ₁ , and the time required from the generation of the pulse P _{2 to} the generation of the pulse P ₃ is Time t ₂ , pulse P ₃
From the occurrence of pulse P ₄ to the time t ₃ , pulse
The time required from the generation of P _{4 to} the generation of pulse P ₅ is t ₄ ,
Comparing those adjacent to each other, three rotation angle interval time differences (t ₂ -t ₁ ), (t ₃ -t ₂ ), (t ₄ -t ₃ ) has two or more “positive” values, and in the case of the reverse rotation of signs (4) to (6), the “positive” value among these three rotation angle interval time differences. Is one or less.

Therefore, calculates the respective duration _{t 1, t 2, t 3} , t 4 of the four rotation angles between successive starting any signal generating means, comparing with each other that adjacent to each other among these required time However, by detecting the number of “positive” of the three rotation angle interval time differences t ₂ −t ₁ , t ₃ −t ₂ , t ₄ −t ₃ , the rotation direction of the rotating body can be identified. .

[Effects of the Invention] As described in detail above, according to the rotation state detection device of the present invention, the rotation detection body that rotates with the rotation body and at least three types of predetermined rotation angles that sequentially increase in one rotation direction. A plurality of signal generating means provided on the surface of the rotation detecting body such that a series of rotation angle intervals having intervals are repeatedly formed, and the signal generating means arranged at a position facing the rotation detecting body. A rotation detection sensor that outputs a detection signal each time when passing through the vicinity, and a time measurement unit that receives a detection signal from the rotation detection sensor and measures the time from any signal generation unit to another signal generation unit, In response to the measurement result of the same time measuring means, from the time from one signal generating means existing in an arbitrary rotation interval group to the signal generating means corresponding to the one signal generating means of the next rotation angle interval group The time required for each of four consecutive rotation angle intervals starting from an arbitrary signal generating means while detecting the rolling speed.
t _1, t _2, t _3, t ₄ required time t ₁ thereof is calculated to, t _2, t _3, t rotation angle interval time difference t ₂ -t ₁ adjacent to each other compared to three from each other of ₄ , t ₃ -t ₂ , t ₄ -t ₃ has a rotation detecting means for discriminating the rotation direction of the rotating body depending on whether the positive number is 2 or more and the positive number is 1 or less. Thus, there is an advantage that the rotation direction as well as the rotation speed of the rotating body can be detected, and there is an effect that the shift state can be easily detected when applied to a transmission of an automobile.

[Brief description of drawings]

1 to 3 show a rotation state detecting device as an embodiment of the present invention, and FIG. 1 is a schematic diagram showing the entire structure thereof.
2 (a) and 2 (b) are schematic diagrams showing the pulse, respectively, FIG. 3 is a flow chart showing the arithmetic operation of the computer, and FIG. 4 shows a pulse train used in the conventional rotation speed detecting device. It is a schematic diagram. 1 ... Kickdown drum which also serves as a rotating body and a rotation detecting body, 2 ... pulse generator as a rotation detecting sensor, 3 ... computer, 4 ... hole as a pulse generating section, P _{1 to} P ₅ ... pulse , S1 to S19 ... Step.

Claims (1)

[Claims] 1. A rotation detection body that rotates together with a rotation body, and a series of rotation angle spacing groups having at least three types of predetermined rotation angle spacing that sequentially increase in one rotation direction are repeatedly formed. A plurality of signal generating means provided on the surface of the rotation detecting body; and a rotation detecting sensor which is arranged at a position facing the rotation detecting body and outputs a detection signal each time the signal generating means passes nearby, A time measuring means for measuring a time from an arbitrary signal generating means to another signal generating means by receiving a detection signal from the rotation detecting sensor,
Rotation of the rotating body from the time from one signal generating means existing in an arbitrary rotation interval group to the signal generating means corresponding to the one signal generating means in the next rotation angle interval group in response to the measurement result of the same time measuring means. While detecting the speed, the required time t ₁ , t ₂ , t ₃ , t ₄ of each of the four continuous rotation angle intervals from the arbitrary signal generating means is calculated, and these required times t ₁ , t ₂ , t ₃ ,
Two adjacent ones of t ₄ are compared with each other, and three rotation angle interval time differences t ₂ -t ₁ , t ₃ -t ₂ , t ₄ -t ₃ are positive when there is more than one and when positive is 1 A rotation state detecting device comprising: a rotation detecting means for identifying a rotation direction of a rotating body at the following time.