JPS6258941B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic turn signal canceling device configured as a practical system.

Automatic turn signal canceling devices have been put to practical use in four-wheeled vehicles and are well known to the general public, but in vehicles such as motorcycles, it is difficult to control the steering angle due to the special driving conditions of the vehicle, such as a bar handle. Because they are small and have the characteristic of banking the vehicle body when changing direction, it is difficult to detect when the change of direction is complete, making it difficult to put them into practical use.

The present applicant has created the present invention in order to effectively solve this problem in view of the practical use of automatic turn signal canceling devices in vehicles such as motorcycles as described above.

It is an object of the present invention to provide a circuit that can detect the heading of a vehicle using a geomagnetic sensor and measure the difference in heading before and after the turn when changing direction, and a signal related to the heading of the vehicle output from the geomagnetic sensor. The present invention is comprised of a circuit that detects the straightness of the vehicle based on the state of change in direction, and cancels the operation of the turn signal on the condition that the azimuth difference is equal to or greater than a set angle and the vehicle becomes straight ahead immediately after changing direction. An object of the present invention is to provide an automatic turn signal canceling device.

Therefore, an object of the present invention is to provide an automatic turn signal canceling device that realizes automatic cancellation of turn signal operation in a vehicle such as a motorcycle, makes driving operations easier for the driver, and can be used not only for motorcycles but also for vehicles in general. It is located in a place that provides.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

The automatic turn signal canceling device according to the present invention detects each condition and cancels the operation of the turn signal before the direction change, under the condition that the vehicle turns by a predetermined angle or more during a direction change, and the vehicle moves straight ahead immediately after the turn. It is designed to cancel the operation.

Therefore, the sequence of operations in the automatic blinker canceling device is as shown in FIG. That is, the procedure is as follows.

Turn on turn signal switch 1.

Data on the traveling direction of the vehicle immediately before the turn signal switch 1 is turned on is stored from the direction sensor 2 in the control unit 3.

When the vehicle starts turning, the azimuth signal of the vehicle from the azimuth sensor 2 changes, and it is determined whether the turning angle becomes equal to or greater than a preset angle.

Immediately after the turning angle becomes equal to or greater than the set angle and the vehicle moves straight ahead, it detects that the azimuth signal from the azimuth sensor 2 becomes stable and outputs a turn signal cancel signal.

FIG. 2 shows a block diagram of the structure of an automatic turn signal canceling device that performs the above operation. Based on FIG. 2, the structure and operation of the automatic blinker cancel device according to the present invention will be explained in accordance with the flowchart related to one signal shown in FIG.

2 is a direction sensor. The orientation sensor 2 consists of a fluxgate type geomagnetic sensor, and by installing two induction windings 90 degrees apart on a roughly donut-shaped iron core, sinusoidal signals X and Y having a phase difference of 90 degrees are generated. Output. The orientation sensor 2 is attached to a predetermined location on the vehicle, and constantly outputs the traveling orientation of the vehicle using signals X and Y. The signals X and Y detect the traveling direction of the husband's vehicle, but the signal processing circuit described below has two systems, an X system and a Y system, and each system is processed independently, and the signal is processed at the final stage. The configuration is such that the turn signal cancel signal is output using either the X or Y signal that has a large change.

Signals X and Y are amplified by a sensor amplifier 4 and input to an analog data selector 5.

6 and 7 are oscillation circuits, and the oscillation circuit 6 receives signals X and Y in the data selectors 5, 8, 9, and 10.
This is for switching. Also, oscillation circuit 7
is connected to the A/D converter 11 and latch 12 and used for generating sampling pulses, and is also connected to the digital comparator 14 via a frequency divider 13 and used for generating pulses for determining the judgment period. FIG. 5 shows an example of the relationship between the judgment cycle pulse and the sampling pulse.

The analog data selector 5 is operated by the oscillation circuit 6.
The signals X and Y are respectively transmitted to the A/D converter 11 by time division.

The signals X and Y are converted from analog to digital by the A/D converter 11, and then input to the data ROM 15, where the signals are linearized.

One of the linearized signals is latch 12.
is sent to the digital comparator 16 via
The other one is sent to the digital comparator 16 via the subtracter 17. The digital comparator 16 judges the state of change in the signal output from the direction sensor 2, which is determined by the latch 12.
The sampling signal is temporarily stored for each sampling and sent to the digital comparator 16, and the sensor signal outputted from the data ROM 15, which can change at any time, is sent to the digital comparator 16, so that the sampling signal and the signal that changes at any time can be separated. This is done by comparing.
However, a signal that changes from time to time is handled by removing unstable portions in the subtracter 17 according to the set value given by the setter 18, and converting it into a digital quantity related to a stable signal.

By the action of the digital comparator 16,
It is determined whether the signal state detected by the sensor 2 is stable or unstable. That is, when the compared signals are equal, it is assumed that the counter 19 is stable.
If they are not equal, the counter 2 is assumed to be unstable.
The number of times each state occurs is counted to 0.

Then, the digital comparator 14 compares the number of counts counted by the counter 19 and the number of times the counted number of the counter 20 is tripled by the multiplier 21 for each judgment period. When the number of counts of the counter 19 is greater than three times the number of counts of the counter 20, a signal is output to the terminal D indicating that the signal state output from the direction sensor 2 at each judgment cycle is stable.

The straight-line driving condition of the vehicle is determined by the digital comparators 14, 16, counters 19, 20, and multiplier 21 described above.

In the adder 22, the sum of signal data determined to be stable is calculated for each determination period for the signal X and the signal Y. The sum of the signals X and Y is obtained separately in the adder 22, but this
(X) 23, RAM (Y) 24, data selector 9
executed by.

The divider 25 inputs the count of the counter 19 and the sum obtained by the adder 22 for each of the signals X and Y by time division, and determines that the signals X and Y are stable. An average value of the determined signal data is determined. The timing of the operation of the divider 25 is determined by the digital comparator 14.
It is determined by the output of the turn signal switch 1 or the turn-on operation of the turn signal switch 1.

By the functions of the adder 22 and the divider 23, it is possible to obtain the average value ₁ , ₂ or the average azimuth value ₀ of the straight direction direction of the vehicle as shown in the flowchart.

The output of the divider 25 is input to RAMs 26 and 27 via the data selector 10. RAM 26 is for signal X, and RAM 27 is for signal Y. Since the signal processing for signal X and signal Y is the same up to the middle, only the X system will be described.

RAM 26 consists of two RAMs, RAM and RAM. The average value ₁ (or ₀ ) of the straight-ahead direction before the direction change is stored in the RAM, and the average value ₂ of the straight-ahead direction of the vehicle in the straight-ahead state after the direction change is stored in the RAM.

The average value ₁ stored in the RAM is determined by the ON operation of turn signal switch 1.
Data 29 is entered via AND gate 28.
Further, the average value ₂ stored in the RAM is entered into data via the AND gate 30 on the condition that the turn signal switch 1 is turned on and the digital comparator 14 outputs the straight driving condition after the direction change.

In the arithmetic circuit 32, data 29, data 3
The absolute value of the difference between the average values ₁ and ₂ that are equal to 1 is determined, and this value is input to the comparator 33.
The comparator 33 compares | _1-2 |, that is, the turning angle of the vehicle before and after the turn, with a predetermined set angle that can be considered as the end of _the turn. | ₁ -
The comparator 33 outputs an output when ₂ | exceeds the set angle. The set angle is given by the setter 34.

The above has been about signal X, but the same applies to signal Y, and signal processing is performed by AND gates 35, 36, data 37, data 38, arithmetic circuit 39, and comparator 40.

A high level output from at least one of the comparators 33 and 40 enters one input of an AND gate 42 via an OR gate 41.

Looking at the above series of operations in a flowchart, flow _f1 : Detects the straight-ahead state of the vehicle before changing direction, and always changes the direction ₁ to a new one. This is done every judgment cycle, and the data is stored in RAM.

Flow f ₂ : When turn signal switch 1 is turned on
The straight heading immediately before the direction change, which was stored in the RAM, is entered in data 29. However, if the vehicle does not go straight before changing direction, ₀ , which is forcibly determined by flow _f1 , is used.

Flow _f3 : Detects the start of a direction change, then detects the straight-ahead state after the end of the direction change, calculates the straight-ahead direction ₂ , stores it in RAM, and transfers it to data 31.

Flow f ₄ : Calculate the turning angle when changing direction and compare it with the set angle.

It consists of the flow.

Then, flow _f5 : It is determined whether the vehicle is stopped during the direction change.

The system is configured to cancel the turn signal only when the vehicle speed is increasing.

The above process is configured in circuit terms by a comparator 46 having a vehicle speed sensor 43, a counter 44, and a setter 45. These detect that the vehicle speed is above a predetermined value, and The input is configured to cause the input to be input. Therefore, when both inputs of AND gate 42 become high level,
AND gate 42 outputs a high level output, causing output circuit 47 to output a turn signal cancel signal.

In addition, by running flow f ₆ in parallel to flows f ₃ , f ₄ , and f ₅ , when the straight-ahead state at the end of a direction change cannot be detected within a certain time range due to disturbance, etc., the traveling distance of the vehicle can be determined separately. l is measured, and the output circuit 47 outputs a turn signal cancel signal under the condition that l is a certain value or more. This is performed by the output circuit 47 by a comparator 50 having a vehicle speed sensor 43, a counter 48, and a setting device 49.
It is configured so that the signal enters.

FIG. 4 shows the output characteristics of the orientation sensor 2 during a direction change, and also shows the relationship between the stable state, unstable state, and judgment period. Further, FIG. 5 shows an enlarged view of portion G in FIG. 4. This clarifies the relationship between the judgment cycle and the sampling cycle for checking the change state of the output of the orientation sensor 2.

FIG. 6 shows a circuit diagram of an automatic turn signal canceling device according to the present invention constructed using a one-chip CPU. In Figure 6, 52 is
As already mentioned, the CPU, 11 is an A/D converter, 47 is an output circuit, and 1 is a turn signal switch. The signal X is input from a terminal 53, the signal Y is input from a terminal 54, and the pulse regarding the vehicle speed is input from a terminal 55.

As is clear from the above description, according to the present invention,
Detects the vehicle's heading, and accurately cancels turn signal operation immediately after the direction change, provided that the difference in direction at the time of the direction change is greater than a predetermined set angle, and the vehicle is driven straight ahead immediately after the direction change. This has advantages such as making it easier to drive the vehicle.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a flowchart showing the basic operation of the automatic turn signal canceling device, and FIG. 2 is a block diagram showing the specific configuration of the automatic turn signal canceling device.
FIG. 3 is a flowchart for explaining the operation of a specific automatic turn signal cancel device, and FIG. 4 is a diagram for explaining the relationship between the output characteristics of the direction sensor, the operation of the turn signal, and the judgment periodic pulse.
FIG. 5 is an enlarged view of a part of FIG. 4, showing the relationship between the judgment period and the sampling period, and FIG. 6 is a diagram showing a circuit constructed using a one-chip CPU. In the drawings, 1 is a turn signal switch, 2 is a direction sensor, and 3 is a control unit.

Claims (1)

[Claims] 1. A circuit that detects the heading of the vehicle using a geomagnetic sensor and measures the difference in heading before and after the change of direction when changing direction, and a circuit that can detect the heading of the vehicle by using a change state of a signal related to the heading of the vehicle output from the geomagnetic sensor. The present invention is characterized by comprising a circuit for detecting the straightness of the turn signal, and cancels the operation of the turn signal on condition that the azimuth difference is equal to or greater than a set angle and the vehicle is in a straight-line driving state immediately after changing direction. Automatic turn signal cancel device.