JPS62163843A - Center position judging method for rotor - Google Patents

Abstract

PURPOSE:To make a wide variety of controls performable in an accurate manner, by making a zero position, staying in succession during a while a vehicle runs more than the specified distance, among zero positions situated at every rotation of a rotor rotating in linkage with steering wheel operation, judge as a rotation center position. CONSTITUTION:A rotational position sensor consists of a rotating disc 1 rotating in linkage with steering wheel operation and photointerrupters 2-4 set up in adjoining to a passing position of a slit 1a and a zero position detecting slit 1b installed in a peripheral edge of the said disc 1 at an equiangular interval. Each pulse signal out of these photointerrupters 2 and 3 is inputted into a counter 6 via an up/down electronic switch 5, while a zero position detecting signal is inputted into an AND gate 9 together with a distance signal. And, a position, staying in succession during a while a vehicle runs more than the specified distance, among zero positions set at every rotation of the rotating disc 1 is judged as a rotational center position, for example, each lighting direction of headlights is controlled by a lamp drive circuit 8.

Description

[Detailed Description of the Invention] Field of Use in the Automotive Industry] The present invention is used to determine the rotation center position of a rotating body that rotates in conjunction with steering of a vehicle, particularly an automobile. This article relates to a preferred method for determining the center position of a rotating body.

[Conventional technology]

Conventionally, in vehicles, especially automobiles, a plurality of slits y are opened at equal angular intervals in a rotary disk that rotates in conjunction with the steering of the traction steering wheel, and two 7-way interrupters are placed adjacent to each other at the positions where these slits pass. It is placed in the same position and performs all types of control in conjunction with the steering wheel.

In other words, the first and second
A pulsed electrical signal having the same waveform but with a phase shift of approximately 90° is generated in the photointerrupter, and this electrical signal is counted to detect the rotational direction and rotational position of the needle.

[Problem that the invention seeks to solve]

However, with conventional rotational position detectors such as this, when the L9 counter/recount causes a miscount 2 due to electrical noise, etc., there is no means to correct the error, and the error accumulates. In order to reduce power consumption, we have developed a method to cut off the supply to the rotational position detector after the ignition switch is turned off. When the ignition switch was turned on, the change in the rotational position of the steering wheel caused errors, which accumulated and resulted in a total of 15 errors.

[Means to solve all problems]

The invention was made in view of this problem, and the predetermined rotational angle position of the rotating body that rotates clockwise and counterclockwise in conjunction with steering wheel steering is defined as flfffi't - the origin position. Of the origin positions located every rotation,
The origin position at which the vehicle remains stopped while the vehicle travels for a predetermined distance or more is determined to be the center position of the rotation of the rotating body in the clockwise and counterclockwise directions.

[For production]

According to the present invention, among the origin positions located at every other rotational axis of the rotating body that rotates in conjunction with steering wheel steering, the origin position is the origin position where the vehicle remains continuously while the vehicle travels for a predetermined distance or more. can be determined as the rotation center position of the rotating body.

[Fire example]

Hereinafter, the method for determining the center position of a rotating body according to the present invention will be explained in detail. FIG. 1 is a block diagram showing one embodiment of this center position determination method.

In the figure, reference numeral 5 indicates an UP/DOWN switch that receives the pulsed electric signal input from the rotational position detection sensor (Fig. 2) and sends out the next processing signal (up signal and down signal) in response to steering wheel steering. The UP/DOW circuit 6 is a processed signal sent out from this UP/DOWN switching circuit 5.
The N counter 7 selects an output terminal (not shown) at a position corresponding to the count f of the counter 6 which is 0, and its level 1rLJMEL-! rHJ decoder, 8 is a headlight (not shown) according to the output state of this decoder T.
A drive circuit that changes the direction of irradiation.

The rotational position detection sensor shown in the second @ is composed of a rotating disk 1 that rotates in conjunction with the steering wheel of the automobile, and photointerrupters 2 to 4 each having a light emitting element and a light receiving element. The photointerrupters 2 and 3 are provided on the outer edge surface of the rotary disk 1 at equal angular intervals and are disposed adjacent to the passage position of the nine-shaped slin tta.

The photointerrupter 2 is designed to generate a pulse-like electrical signal with the same waveform but with a phase shift of approximately 90° by passing through the slit 1a as the rotating disk 1 rotates. This pulse-like 't11. % polarization is U
The signal is input to the P/DOWN switching circuit 5. A slit 1b for detecting the origin position is independently provided at a predetermined rotational angle position on the outer circumferential edge surface of the rotating disk 1. It has become. That is, slit 1
b is the rotational position tlt facing the photo interrupter 4 - this is the origin position of the rotary disk 1, and this origin position is the steering position (hereinafter referred to as the entire steering wheel center) when traveling straight ahead. They are set in correspondence. the law of nature'! 9. At the no-dle center, the rotary disk 1 is located at the origin position shown in the figure (f) (hereinafter referred to as the rotation center of the entire rotating disk). The origin position of the rotary disk 1 is shifted by 360° and detected every time the center knob rotates clockwise or counterclockwise.

In general, the steering wheel of an automobile can be rotated less than two turns each in a clockwise direction (hereinafter referred to as rightward direction) and in a counterclockwise direction (hereinafter referred to as rightward direction) around the center of the steering wheel. Consequently, the photo interrupter 4 detects a total of three origin positions including the rotation center, and when detecting the origin position, the first
rHJ at one input terminal 9a of the AND gate 9 in the figure.
A level origin position detection signal is input.

The slit 1b for detecting the origin position has a slightly thicker slit shape so that the entire origin position can be detected within a slightly wider range of handle play.

On the other hand, the UP/DOWN switching circuit 5 processes the input pulsed electric signal and sends up and down signals in meters according to the right and left steering amounts of the steering wheel. The UP/DOWN counter 6 is
The count value is up-counted or down-counted by the number of input up signals or down signals. That is, when the rotating disk is at the rotation center position, the count value in the UP/DOWN counter 6 is determined to be zero as a general standard, and when the steering wheel is steered to the right, the count value increases sequentially and when the steering wheel is steered to the left. F: The count value will gradually decrease. The count value sent by the UP/DOWN counter 6 is input to the decoder T, and the direction of illumination of the headlight is linked to the steering wheel steering by the operation of the turn drive circuit 8 based on the output state of the decoder T. It is designed to be controlled.

On the other hand, the input terminal 9b on the other side of the AND gate 9 is connected to a signal sent out as the automobile travels, such as a vehicle speed sensor (
A vehicle speed signal (not shown) sent out is subjected to waveform shaping and then input as a distance signal. During the origin position detection signal generation period, this distance signal passes through an AND gate 9 and is sent to a frequency divider 10. It is set to be entered. and,
When the distance signal input to the branching unit 10 overflows,
A set signal is sent to the S input of the R-S flip-flop circuit 11, and a home position detection signal input to the AND gate 9 is sent to the reset terminal of the flip-flop circuit 11 and the divider 10. It is input in a branched manner, and a reset is applied when the falling edge reaches 9 edges.

The counter 6 is reset when the Q output of the flip-flop circuit 11 reaches the rHJ level.

Next, the operation of the fc device configured in this manner will be explained.

That is, it is assumed that the automobile is now traveling straight ahead, and that the rotary disk 1, which rotates in conjunction with the steering wheel, is at the rotation center position shown in FIG. At this time, U
The count value on the P/DOWN counter 6 should be zero at the moment, but due to the above-mentioned electric Mf6, or after turning off the ignition switch and rotating the handle, etc., the count value deviated from zero by 19. It may be a count value. When this machining deviation nine count value is input to the decoder 7, a problem arises in that the variable operation of the illumination direction of the headlamp controlled by the decoder 7'' is shifted in accordance with the count value.

However, in this embodiment, since the elaborate correction operation described below is quickly performed, it becomes possible to control the irradiation direction of the headlight in conjunction with the steering wheel steering without any trouble.

In other words, it is no exaggeration to say that most of the roads a car travels are straight, and it is not possible to drive a car over a long distance by turning the steering wheel once.

Therefore, the distance No. 1 passing through the AND gate 9 during the generation period of the origin position detection signal at the rightward and leftward one rotation position of the rotating disk is the distance No. 1 passing through the origin position detection signal generation period at the rotation center position. There are also few eccentric engineer 9s. In the inventor's research based on an actual vehicle, it is possible that the vehicle could travel a relatively long distance on a U-turn road or the like with one rotation of the steering wheel, but the distance traveled was less than 30 meters. 19, the origin position Ifk of the rotating disk 1 is rotated to the right and stopped at the 1 rotation position in the left direction, and does not travel more than 30 m in the state of rotation, and the distance signal when passing through the AND gate 9 is the right and left direction. At one rotation position in the left direction, the distance is equivalent to 30 m or less. On the other hand, it is clear that the distance that the rotating disk 1 travels in a state where the origin position is stopped at the rotation center is more than 30 m since most of the traveling path is a straight road.
The distance signal passing through the AND gate 9 is equal to or more than 30 m at the rotation center position. In other words, in this embodiment, when the division ratio of the frequency divider 10 is set to a value corresponding to a travel distance of 30 m, and a distance signal equivalent to 9.30 m or more passes through the AND gate 9, The frequency circuit 10 overflows and the S of the 20717071 circuit 11
A set signal is input to the input. In other words, the period in which a distance signal equivalent to 30 m or more is input to the frequency divider 10 is the period when the origin position of the rotating disk 1 is stopped at the rotation center and travels for 30 m or more and reaches time t. When the flip-flop circuit 11 is in the set state, its Q
An output signal of rHJ level is sent from the output, and the counter 6 is reset. Then, this reset operation is canceled when the falling edge of the origin position detection signal which is branched and inputted to the W input of the flip-flop circuit 11 reaches the 9th edge, and thereafter the counter 6 uses the up signal sent from the UP/DOWN switching circuit 5. and a down signal count of 2 will be performed.

Needless to say, at this time, the branching device 10 is reset at the 9th edge of the falling edge of the origin position detection signal to prepare for the input of a missing distance signal. On the other hand, when the rotary disk 1 is stopped at the origin position and rotated one rotation in the left direction and travels in a ratio state, the area and gate 9 distance signal passes through when the origin position detection signal is generated. , 30 in this state
The motor does not travel more than m, and the origin position detection signal falls before the branch 1G overflows. As a result, the branching unit 10 is reset at the 9th edge of the falling edge of this signal, and the set signal is not input to the S input of the lag flop circuit 1!11. In other words, the counter 6 is not reset when the rotating disk 1 is rotated to the right and remains at the home position once in the left direction, and at best, the counter 6 is reset only when the home position is stopped at the rotation center position. It is done. That is, the count value of the counter 6 should be zero at the time when the origin position is stopped at the rotation center position.
Even if the counter 6 miscounts, the count value will be corrected appropriately after traveling straight for 30 meters or more, and even if the counter 6 miscounts, the correction will be made appropriately at the true rotation center position of the rotating disk. This makes it possible to control the irradiation direction of the headlights without any trouble in conjunction with the steering wheel.

In addition, in this example, the dividing ratio of the divider 100 was set to a value corresponding to a traveling distance of 30 m, but the distance is not limited to 30 m. It goes without saying that you can set it to any value as long as you are satisfied with the distance that there is no risk of driving under such conditions.

19. In this example, we will explain the correction operation of the counter in a so-called cornering lamp system, which changes the irradiation direction of headlights in conjunction with steering wheel steering. It can also be used to correct counters in other external systems that are controlled in conjunction with steering wheel steering. It goes without saying that it is possible to completely determine the rotation center of a rotating body that rotates in conjunction with steering wheel steering, and that all types of control in the vehicle can be performed based on this determined rotation center, and the value of its use is [Effect of the Invention] As explained above, according to the method for determining the rotation center position of a rotating body according to the present invention, the rotation center position of a rotating body that rotates clockwise and counterclockwise in conjunction with steering wheel steering can be adjusted. The predetermined rotational angle position is defined as the origin position, and among the origin positions that are located every rotation of this rotating body, the origin position where the vehicle remains continuously while traveling for a predetermined distance or more is determined by rotating the rotating body clockwise. Since the error is determined as the center position of rotation in the clockwise direction,
Among the origin positions that are located every other revolution of a rotating body that rotates with a delay in response to steering wheel steering, the origin position where the vehicle remains at rest while the vehicle travels for a predetermined distance or more is determined as the rotation center position of the rotating body. If the predetermined distance at is selected appropriately, it becomes possible to accurately determine the straight steering position of the vehicle in correspondence with the rotation center position of the entire rotating body, and at the time of determining this straight steering position, for example, the rotation It becomes possible to correct the miscount of the counter in the position detection device r.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the method for determining the center position of a rotating body according to the present invention, and FIG. 2 is a schematic diagram showing the rotational position detection sensor used in this method for determining the center position. 1...Rotating disk, 1b...Slit for detecting origin position, 2-4...Photo interrupter, 5" UP/DOWN switching circuit, 6...UP/D
OWN counter, 10... Diverter, 11...-
R-8 flip-flop circuit.

Claims (1)

[Claims] A rotating body that rotates clockwise and counterclockwise in conjunction with steering of a vehicle, and an origin position that detects the origin position of this rotating body every rotation, with a predetermined rotation angle position of this rotating body being the origin position. detecting means, which detects, among the origin positions of each revolution of the rotary body, the origin position where the vehicle remains continuously while traveling for a predetermined distance or more, as the rotation center position of the rotary body in the clockwise and counterclockwise directions; A method for determining the center position of a rotating body, characterized in that the center position of a rotating body is determined as follows.