JPS62231846A - Electronic turning signal automatic canceler - Google Patents

Abstract

PURPOSE:To unify the formation of a circuit and reduce a cost, simplify adjustment, and secure durability and reliability by using pulse signals corresponding to the rotating direction and rotating amount of a steering handle from a steering angle sensor, and canceling a turn signal. CONSTITUTION:Only a pulse signal in the reverse direction which is generated when steering back a steering handle is made pass through a gate circuit 3a, or 3b, out of pulse signals which are generated by a steering angle sensor 1 in accordance with the rotation of a steering handle. Then, the pulse signal is subjected to wave form shaping by a pulse shaping circuit 5, and sent to a comparison circuit 6. And, the number of the pulse signals is compared with a previously set value and, when the number becomes above the set value, the steering back of the steering handle is judged completed, and a reset signal is outputted. Thereby, the excitation of a turning signal relay 9 is removed, to cancel the flashing of the turning signal 10.

Description

DETAILED DESCRIPTION OF THE INVENTION C. Industrial Application Field The present invention relates to a turn signal auto canceller, and more particularly to an electronic turn signal auto canceler used in automobiles.

[Conventional technology]

In vehicles, there have been various types of turn signal auto cancelers that automatically cancel the activated turn signal before changing direction, and they are broadly divided into mechanical types and electronic types. be able to. The electronic type electrically detects the amount of rotation and return of the handle and uses it as a reference for canceller operation, and is relatively reliable in operation. Because there is no foreign body sensation and no operating noise is generated, it is increasingly being adopted in luxury passenger cars.
933. Japanese Patent Application Publication No. 59-97136, Utility Application Publication No. 59-993
Various types such as 8 have already been proposed.

[Problem that the invention seeks to solve]

Electronic types require a sensor to know the amount of rotation of the handle and whether or not the handle is turned back, but conventional types use dedicated sensors and process signals from specially designed sensors. This was the basis for cancellation. However, since it is a specialized product, the sensor is naturally expensive, and the cost of the entire system is also high, so it is only used in some high-end passenger cars, and its spread to general vehicles has been slow.

Furthermore, the conventional system requires two independent control circuits, one for the right direction and one for the left direction.
The circuit configuration is complex, the cost is high, and adjustments are troublesome.
There were also problems with durability and reliability.

The purpose of this invention is to eliminate the drawbacks of the conventional turn signal auto canceller described above, and utilizes a steering angle sensor widely used in suspension control, seat belt control, etc., and outputs an output from the steering angle sensor. To provide a novel electronic turn signal auto-canceller that uses only the pulse signal generated when the steering wheel is turned back and cancels the flashing of the turn signal light with a single comparison circuit. It is.

[Means for solving problems]

This invention includes a steering angle sensor 1 that outputs pulse signals according to the amount and direction of rotation of the steering wheel, and a pulse signal in the opposite direction that is generated when the steering wheel is turned back in response to a signal from the steering angle sensor 1. When the number of pulse signals inputted from the pair of gate circuits 3a and 3b that only allow signals to pass through and the gate circuits 3a and 3b and sent when the steering wheel is turned back exceeds a preset value. The above-mentioned conventional problems are solved by constructing a turn signal auto-canceller including a comparison circuit 6 which issues a reset signal and cancels the excitation of the turn signal relay t:fX a , =.

[Effect]

Of the pulse signals generated from the steering angle sensor 1 in response to the rotation of the steering wheel, only the pulse signal in the opposite direction generated when the steering wheel is turned back passes through the gate circuit 3a or 3b and is processed in the pulse shaping circuit 5. The waveform is shaped and sent to the comparison circuit 6. The comparator circuit 6 compares the number of pulse signals sent with a preset value, and when the number exceeds this set value, it is determined that the steering wheel has been turned back, and a reset signal is sent. This is to de-energize the turn signal relay and cancel the flashing of the turn signal lamp.

〔Example〕

FIG. 1 is a block diagram of an embodiment of the electronic turn signal auto-canceller according to the present invention, and FIG. 2 is a specific electrical circuit diagram thereof. circuit 2a
, 2b are connected, and a pulse signal generated as the steering wheel rotates is sent to the steering wheel rotational direction detection circuits 2a, 2b, so that the rotational direction is detected. These steering wheel rotation direction detection circuits 2a and 2b use flip-flops, and as shown in FIG. The pulse signal is such that the leftward rotation pulse signal is inputted to the reset input terminal, and the leftward rotational direction detection circuit 2b of the steering wheel rotation direction detects the leftward rotation pulse of the steering angle sensor l to the cent input terminal. A clockwise rotation pulse signal is input to each reset input terminal. In other words, the pair of steering wheel rotation direction detection circuits 2a and 2b separates the pulse signal generated as the steering wheel rotates into clockwise rotation and counterclockwise rotation, and sends them to the next circuit. be. Furthermore, this steering wheel rotation direction detection circuit 2
a.

The output terminals 2b are each connected to a pair of gate circuits 3a.

3b, and pulse signals separated in the left and right direction by the steering wheel rotation direction detection circuits 2a and 2b are sent to gate circuits 3a and 3b, respectively. The gate circuits 3a and 3b are constituted by an AND circuit as shown in FIG. Output signals from the right turn signal switch memory circuit 4a are sent to the circuit 3b, and the right gate ml path 3a receives a pulse signal generated when the steering wheel is rotated to the left. In other words, the leftward gate circuit 3b outputs a pulse signal generated when the steering wheel is rotated to the right, that is, a pulse signal generated when the steering wheel is turned back during a right turn operation. It is designed to allow each pulse signal to pass through when the steering wheel is turned back. Further, the output terminals of the pair of gate circuits 3a and 3b are connected to a common pulse shaping circuit 5, so that the waveform of the pulse signal passing through the gate circuit 3a or 3b is shaped. As shown in FIG. 2, this pulse shaping circuit 5 consists of a differentiating circuit and an integrating circuit, and is used to generate a pulse signal having a constant width. A comparator circuit 6 is connected to this pulse shaping circuit 5, and it judges whether the sent pulse signal exceeds a preset number of pulses, and when it exceeds the set value, it outputs a cent signal. It seems to be emitting.

As shown in FIG. 2, this comparator circuit 6 uses a capacitor 7, stores the sent pulse signal in this capacitor 7, and outputs a reset signal when the pulse signal exceeds a certain value. On the other hand, in the figure, 83 is a right turn signal switch, 8b is a left turn signal switch, and each is a turn signal switch memory circuit 4a.
, 4b are connected to the set input terminals. The turn signal switch memory circuits 4a and 4b are composed of flip-flops, and their reset input terminals are connected to the above-mentioned comparator circuit 6, and the reset signal is sent to the comparator circuit 6.
It looks like it will be sent from.

Further, in the figure, 9a and 9b are a pair of turn signal relays, and the turn signal switch storage circuits 4a and 4b receive signals from the turn signal lamps 10a and 10b.
This is to start and cancel the blinking operation. The figure shows a flasher unit for blinking the turn signal lamps 10a and 10b. Further, reference numeral 12 in the figure is a reset switch, which is connected to the reset input terminals of the turn signal switch storage circuits 4a and 4b, and is manually operated to control the turn signal lamp 10a.

It is now possible to cancel the blinking of 10b.

Next, the operation of this electronic turn signal auto canceller will be explained.

To make a right or left turn in a car, first move the car in the direction you want to turn, following the curvature of the road, turn the steering wheel, and after completing the turn, turn the steering wheel back to return to its original position to complete the series of operations. However, to explain the operation using a right turn as an example, when the right turn signal switch 8a is turned on for a right turn, the right turn signal relay 9a is energized and the right turn signal lamp 10a starts blinking. Start. On the other hand, when the driver starts rotating the steering wheel to the right to make a right turn, the steering angle sensor 1 starts sending a pulse signal generated by the rightward rotation to the steering wheel rotation direction detection circuits 2a and 2b. In this case, the clockwise rotation pulse signal is sent to the reset input terminal of the right steering wheel rotation direction detection circuit 2a and the set input terminal of the left steering wheel rotation direction detection circuit 2b.
The pulse signal for counterclockwise rotation is sent to the set input terminal of the left steering wheel rotation direction detection circuit 2b and the cent input terminal of the right steering wheel rotation direction detection circuit 2b, and a clockwise rotation pulse signal is generated. Then, a pulse signal is output from the right steering wheel rotation direction detection circuit 2a to the gate circuit 3a, but the pulse signal is output to the other input terminal of the right gate circuit 3'a, which is constituted by an AND circuit. Since no signal is being sent, the gate will not open.

Therefore, the pulse signal for clockwise rotation during a right turn is prevented from passing through the gate circuits 3a and 3b. When the steering wheel starts turning back after turning the corner, a pulse signal indicating a leftward rotation is generated, and this pulse signal is sent to the steering wheel rotation direction detection circuit 2b. is inputted to the left gate circuit 3b. Note that the leftward pulse signal is also sent to the right steering wheel rotation direction detection circuit 2a, but since it acts as a reset input in this detection circuit 2a, no output is made from this detection circuit 2a. On the other hand, since a signal is also sent to this gate circuit 3b from the rightward turn signal switch memory circuit 4a, when the rotation of the turn-back starts, it means that the two people have the same power, and the gate opens and a pulse signal is sent to the gate circuit 3b. is sent to the pulse shaping circuit 5. In other words, in the case of a right turn, the pulse signal of counterclockwise rotation at the time of turning back is used, and in the case of a left turn, the pulse signal of clockwise rotation is applied to the gate 3a or 3b, respectively.
It will pass through. The reversal pulse signal that has passed through the gate 3a is waveform-shaped by a pulse shaping circuit 5, adjusted to a pulse of a constant width, and sent to a comparison circuit 6. This comparison circuit 6 is a circuit that compares and determines whether the number of pulse signals that have been sent exceeds a preset number, and when the number of input pulse signals exceeds the set value, a reset signal is issued. . Note that this comparison circuit 6 is preset (the set value is determined based on the number of pulses that corresponds to the amount of rotation of the steering wheel that is normally rotated when turning back. If the input pulse exceeds this set value) As a result, the comparator circuit 6 determines that the switchback has been completed and issues a reset signal.This reset signal is sent to the reset input terminals of the turn signal switch memory circuits 4a and 4b, and the turn signal switch memory The circuit 4a de-energizes the turn signal relay 93 and cancels the flashing of the right turn signal lamp 10a.In the case of a left turn, in the same way, the pulse signals are compared when turning back, the reset signal is output, and the turn signal lamp 10a is turned off. De-energizing signal relay 9b, turn signal lamp 1
The blinking of 0b is canceled.

In addition, even if the number of pulses at the time of switching back does not reach the set value, by operating the reset switch 12, the excitation of the turn signal relay 9a or 9b is canceled and the flashing of the turn signal lamp lOa or 10b is canceled. be able to.

〔Effect of the invention〕

The electronic turn signal auto-canceller according to the present invention has the above-described configuration, and uses a steering angle sensor to electrically detect the direction and amount of rotation of the steering wheel, thereby canceling the turn signal. There is no operating noise like mechanical ones, and there is no risk of malfunction.
Stable functionality can be maintained at all times.

In addition, it uses a steering angle sensor that is widely used for suspension control, seat heel control, etc., and there is no need to use a dedicated sensor, so it can be installed on vehicles at low cost and has extremely high reliability. . Furthermore, unlike conventional devices, there is no need for two independent control circuits for the right direction system and the left direction system, and only one comparison circuit for right and left systems is required, simplifying the circuit and making adjustments easier. It is simple, durable, and reliable, and has great practical effects. In addition, since it electrically cancels the lighting of the turn signal lamp, it is possible to freely select the installation location of each switch and nine types of shapes, allowing for greater freedom in car design. It also has

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of an electronic turn signal auto canceler according to the present invention, and FIG.
The figure is a specific electrical circuit diagram. ■... Steering angle sensor, 2a... Steering wheel rotation direction detection circuit (right), 2b... Steering handle rotation direction detection circuit (left), 3a... Gate circuit (right), 3b...・Gate circuit (left), '4a... Turn signal switch memory circuit (right), 4b... Turn signal switch memory circuit (left), 5... Pulse shaping circuit, 6... Comparison circuit, 7 ...Capacitor, 8
a...Turn signal switch (right), 8b...Turn signal switch (left), 9a...Turn signal relay (right), 9b...Turn signal relay (left), 1oa---Turn Signal lamp (right) 10
b...Turn signal lamp (left), 11...Francher unit, 12...Lise, Tosui, 7,000 or more

Claims (1)

[Claims] A steering angle sensor 1 outputs a pulse signal according to the amount and direction of rotation of the steering wheel, and receives signals from the steering angle sensor 1, and passes only a pulse signal in the opposite direction that is generated when the steering wheel is turned back. a pair of gate circuits 3a, 3b, and the gate circuits 3a, 3b
a comparator circuit 6 that issues a reset signal when the number of pulse signals inputted from and sent when the steering wheel is turned back exceeds a preset value, and releases the excitation of the turn signal relays 9a and 9b; An electronic turn signal auto-canceller characterized by: