JPS6251778B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an automatic turn signal canceling device that combines a circuit that measures changes in the heading of a vehicle and detects a fixed azimuth difference, and a circuit that measures the distance traveled by a vehicle and detects a fixed distance. Regarding.

2. Description of the Related Art Conventionally, it is well known that automobiles having a handle such as a steering wheel are equipped with an automatic turn signal canceling device that automatically turns off the operation of the turn signals after a direction change.

In contrast to the above, equipping a motorcycle with a bar handle with an automatic turn signal canceling device requires technical difficulties due to the structure of the vehicle body and the unique driving method, and at the same time, it is difficult to put it into practical use. It is required that the device be configured for reliable operation.

In view of the above-mentioned technical problem, the present inventor has created the present invention in order to effectively solve the problem.

An object of the present invention is to provide a circuit that detects the traveling direction of a vehicle from time to time using a geomagnetic sensor, measures changes in the traveling direction of the vehicle when changing direction, and detects a constant difference in direction, and a mileage sensor. By configuring a circuit that measures the travel distance of the vehicle when changing direction using a counter or the like and detects a certain distance, a signal for canceling the vehicle is generated when a predetermined difference in direction occurs and the vehicle has traveled a predetermined distance. It is an object of the present invention to provide an automatic blinker canceling device which automatically cancels the output and appropriately cancels the output.

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

FIG. 1 is a block diagram showing the structure of an automatic turn signal canceling device. Reference numeral 1 denotes a geomagnetic sensor for detecting orientation, and a specific example of the geomagnetic sensor 1 is shown in FIG. The geomagnetic sensor 1 is a fluxgate type geomagnetic sensor, and includes an approximately donut-shaped iron core 2 provided with an excitation winding 3 and induction windings 4 and 5. The excitation winding 3 is wound over the entire length of the iron core, and an alternating current is passed through this 3. The induction windings 4, 5 consist of respective integral conducting wires, each having two winding portions. The winding portions are located at approximately equal intervals on the iron core 2. As is clear from the figure, the linear directions A and B connecting the respective winding parts of the winding 4 and the winding 5 are
The windings 4 and 5 are arranged in such a positional relationship that they are perpendicular to each other.

The operation of the fluxgate type geomagnetic sensor 1 will be explained. From the geomagnetic sensor 1, two signals X,
Although Y is obtained, the signal X for the induction winding 4 will be explained. If the iron core 2 is placed in a substantially horizontal plane, for example, in a position where the direction A is the east-west direction, the iron core 2, which is a magnetic material, will have C, C, unless the iron core is in a magnetically saturated state. As shown in D, the geomagnetic field lines pass through. However, when the excitation winding 3 is energized so that the iron core 2 becomes magnetically saturated when a large current is applied, the magnetic force lines C and D
be excluded from the outside. When the excitation winding 3 is no longer energized, the lines of magnetic force pass through again as shown at C and D. Due to the above-described action, when an alternating current with a frequency of 2 is applied to the excitation winding 3, a pulse voltage V of a frequency of 2 is generated at the terminal 6. It is also possible to increase the output by adding a direct current bias to the alternating current to lower the frequency of the voltage V. The magnitude of this pulse voltage changes depending on the amount of magnetic lines of force passing through the iron core 2, and therefore, if we detect the earth's magnetism clockwise starting from the north, we will get the characteristic X as shown in Figure 3. . Here signal X
has already been peak detected by the peak detection circuit provided in the flux gate 1.

The signal Y is also similar to the signal X described above. However, since the positions of the windings of the induction winding 5 are shifted by 90 degrees compared to those of the induction winding 4, the signal Y is generated with a phase shift of 90 degrees compared to the signal X. This relationship is shown in FIG.

As mentioned above, two signals X,
Y is output. The geomagnetic sensor 1 is installed at an appropriate location on the vehicle, and when it is installed, the geomagnetic sensor 1 is placed so that the direction E in FIG. 2 coincides with the front direction of the vehicle. The two signals X, Y
After being amplified, the signal is sent to a circuit 7 which measures the change in the heading of the next stage vehicle when it changes direction and detects a fixed heading difference.

FIG. 4 shows a specific configuration of the circuit 7 for measuring changes in heading. Since the signal processing is the same for signals X and Y, only signal X will be explained. 8
is a sample and hold circuit, which holds and stores the output voltage of the signal X related to the direction of the vehicle before the direction change when the turn signal switch 9 is turned on. 10 is a difference calculation circuit, which calculates the difference between the voltage held in the circuit 8 and the continuously changing voltage of the signal X;
Output this. Since the output of the circuit 8 is the heading of the vehicle before turning, and the signal X is the heading of the vehicle during the turning, the output of the circuit 10 corresponds to the turning angle, that is, the change in heading during the turning. A comparator 11 compares the set value given by the setter 12 and the output of the circuit 10 in terms of magnitude. When the output of the circuit 10 exceeds the set value,
Give output. The set value given by the setter 12 approximately corresponds to the azimuth difference at which the direction change is expected to be completed.

Regarding signal Y, 13 is a sample hold circuit, 14 is a difference calculation circuit, 15 is a comparator, 1
6 is a setting device.

Regarding the signals X and Y, the output of at least one of the comparators 11 and 15 that significantly produces a voltage difference corresponding to the azimuth difference is taken out as the output of the detection circuit 7 via the OR gate 17.

In FIG. 1, the output of the detection circuit 7 is held by a flip-flop 18, and an AND gate 19
is input.

Reference numeral 20 designates a well-known mileage sensor, and its specific configuration includes, as shown in FIG. 5, a reed switch 20a...
A magnet 22 rotatable in the F direction is attached to a wire 21, and a pulse-like output is obtained by turning on and off the reed switch 20a by the magnet 22. By counting these output pulses with a counter 23, the travel distance is determined. The counter 23 enters the set state by turning on the blinker switch 9, and starts measuring the distance traveled.

The output of the counter 23 is input to a digital comparator 24, which compares the set value given from the setter 25 with the output of the counter 23, and when the output of the counter 23 exceeds the set value, the comparator 24 outputs an output. The output of the comparator 24 is temporarily held in a flip-flop 26.
Input to AND gate 19.

When both inputs of the AND gate 19 become high level, the output of the AND gate 19 becomes a high level, and the high level output of the gate 19 operates the output circuit 27, turns off the turn signal relay 28, and automatically activates the turn signal. to cancel.

As described above, the automatic blinker canceling device according to the present invention also includes a circuit that separately measures the azimuth difference of the vehicle during a turn and the distance traveled by the vehicle. When the driver turns on the turn signal switch 9 before changing direction, sample and hold circuits 8 and 13, flip-flops 18 and 26, counter 23, and output circuit 27 are activated.
is set, and during the direction change, the circuit for measuring the difference in direction of the vehicle and the circuit for measuring the distance traveled by the vehicle are activated at the same time as the turn signal switch 9 starts operating, and the set direction difference and the setting are activated. After detecting the travel distance, that is, after the conditions regarding the azimuth difference and the travel distance are satisfied, a cancel signal is outputted via the AND gate 19.

Next, another embodiment will be described based on FIG.
Elements that are the same as those in the previous embodiment are given the same reference numerals. In this embodiment, the output of the flip-flop 18 is input to the AND gate 29, and the output of the mileage sensor 20 is input to the AND gate 29.
The counter 23 is configured to input the output of the AND gate 29 . Therefore, at the same time as the turn signal switch 9 is turned on, the change in the direction of the vehicle that is first turning is measured, and only when the change in direction exceeds a set value, the counter 23 starts counting and measures the travel distance of the vehicle. When the travel distance of the vehicle exceeds a set value, a signal for canceling the operation of the turn signal is outputted via the comparator 24 and the setting device 25.

As described above, in each of the above embodiments, the distance traveled by the vehicle is measured in addition to the change in the traveling direction of the vehicle during a direction change, and the turn signal is not automatically canceled unless the vehicle has traveled a certain distance. Configured automatic cancellation can be performed.

Furthermore, in the above embodiment, the azimuth difference detection circuit in which the geomagnetic sensor 1 outputs two signals X and Y and detects either voltage difference as an azimuth difference is not limited to this, and the distance detection circuit described above is It can be used in conjunction with orientation difference detection circuits that utilize various types of geomagnetic sensors.

As is clear from the above description, according to the present invention,
In addition to the circuit that measures the change in the heading of the vehicle during a turn and detects a fixed azimuth difference, it also includes a circuit that measures the distance traveled by the vehicle and detects the fixed distance, so the turn signal can be activated at the appropriate time. It has the advantage of being able to perform automatic cancellation.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a block diagram of an automatic turn signal canceling device according to the present invention, FIG. 2 is a perspective view of a geomagnetic sensor, FIG. 3 is a characteristic diagram of the output of the geomagnetic sensor, and FIG. FIG. 4 is a block diagram of a circuit for detecting an azimuth difference, FIG. 5 is a perspective view schematically showing a traveling distance sensor, and FIG. 6 is a diagram similar to FIG. 1 of another embodiment. In the drawing, 1 is a geomagnetic sensor, 7 is a circuit for detecting an azimuth difference, 9 is a turn signal switch, 20 is a mileage sensor, 23 is a counter, and X and Y are signals related to the azimuth.

Claims (1)

[Claims] 1 In addition to a circuit that has a geomagnetic sensor, measures the difference in orientation of the vehicle before and after turning based on the output signal of the geomagnetic sensor, compares the difference in orientation with a set value, and outputs an output when the difference in orientation exceeds the set value. , has a travel distance sensor, and is equipped with a circuit that measures the travel distance of the vehicle when changing direction and outputs an output when the vehicle has traveled a certain distance, and both outputs detect a certain direction difference and a certain distance An automatic turn signal cancel device is characterized in that it outputs a signal to cancel the operation of a turn signal when the vehicle is driven.