JPH0649433B2 - Electronic turn signal auto canceller - Google Patents

Description

TECHNICAL FIELD The present invention relates to a turn signal auto canceller, and more particularly to an electronic turn signal auto canceller used in an automobile.

[Conventional technology]

In the vehicle, there are various types of turn signal auto cancellers that automatically cancel the turn signal that has been operated before turning, and there are various types of them, which are roughly classified into mechanical type and electronic type. be able to. The electronic type is the one that electrically detects the rotation amount and the return amount of the handle and uses it as the reference for the operation of the canceller, and the operation is relatively reliable, and like the mechanical type, when the handle is operated. Since it has no feeling of foreign matter and does not generate operating noise, it has come to be used in high-end passenger cars and the like. JP-A-57-130835 and JP-A-57-10
7933, Japanese Patent Application No. 59-97136, No. 59-99
Various types such as 38 have already been proposed.

[Problems to be solved by the invention]

In the electronic type, a sensor is required to know the rotation amount and the return amount of the handle, but in the conventional type, all dedicated sensors are used and the signal from the specially designed sensor is processed. It was the standard of cancellation. However, since it is a dedicated product, the sensor naturally has a high price, the cost of the entire system is high, and it is only used in some high-end passenger cars, and its spread to general vehicles has been delayed.

Furthermore, the conventional one requires two independent control circuits for the right-handed system and the left-handed system, which makes the rotation configuration complicated, the cost is high, the adjustment is troublesome, and the durability and reliability are high. There was also a problem with sex.

The present invention is intended to eliminate the drawbacks of the conventional turn signal auto canceller, and utilizes a steering angle sensor widely used for suspension control, seat belt control, etc., and outputs from the steering angle sensor. A new electronic turn signal auto canceller that cancels the blinking of the turn signal light with a single comparison circuit using only the pulse signal generated when the steering wheel is turned back Is.

[Means for solving problems]

The present invention is directed to a steering angle sensor 1 that outputs a pulse signal according to a rotation amount and a rotation direction of a steering wheel, and a reverse pulse generated when the steering wheel is turned back by receiving a signal from the steering angle sensor 1. When the number of pulse signals input from the pair of gate circuits 3a and 3b for passing only signals and the gate circuits 3a and 3b and sent when the steering wheel is turned back exceeds a preset set value. The conventional problem described above is solved by forming a turn signal auto canceller from a comparator circuit 6 which issues a reset signal and deenergizes the turn signal relays 9a and 9b.

[Action]

Among the pulse signals generated from the steering angle sensor 1 according to the rotation of the steering wheel, only the reverse pulse signal generated when the steering wheel is turned back passes through the gate circuit 3a or 3b, and the pulse shaping circuit 5 The waveform is shaped and sent to the comparison circuit 6. Then, the comparison circuit 6 compares the number of pulse signals sent thereto with a preset set value, and when the set value is exceeded, it is determined that the steering wheel steering wheel return has been completed, and the reset signal is output. The signal is emitted to de-energize the turn signal relay and cancel the blinking of the turn signal lamp.

〔Example〕

FIG. 1 is a block diagram of an embodiment of an electronic turn signal auto canceller according to the present invention, and FIG. 2 is a specific electric circuit diagram thereof. The steering angle sensor 1 detects a pair of left and right steering handle rotation directions. Circuit 2
a and 2b are connected, and a pulse signal generated with the rotation of the steering wheel is sent to the steering wheel rotation direction detection circuits 2a and 2b to detect the rotation direction. The steering wheel rotation direction detection circuits 2a and 2b use flip-flops. As shown in FIG. 2, in the steering wheel rotation direction detection circuit 2a in the right direction, the steering angle sensor 1 rotates in the right direction at the set input terminal. As for the pulse signal, the left rotation pulse signal is inputted to the reset input terminal respectively, and in the left steering wheel rotation direction detection circuit 2b, the left rotation pulse of the steering angle sensor 1 is set to the set input terminal. As for the signal, the right rotation pulse signal is input to the reset input terminal. That is, the pair of steering wheel rotation direction detection circuits 2a and 2b divides the pulse signal generated with the rotation of the steering wheel into right rotation and left rotation, and sends them to the next stage circuit. is there. Further, the output terminals of the steering handle rotation direction detection circuits 2a and 2b are respectively a pair of gate circuits 3.
Pulse signals separated by the steering wheel rotation direction detection circuits 2a and 2b in the left-right direction are connected to the gate circuits 3a and 3b, respectively. The gate circuits 3a and 3b are composed of AND circuits as shown in FIG. 2, and the output signal from the left direction turn signal switch storage circuit 4b, which will be described later, is supplied to the right direction gate circuit 3a. Circuit 3b
The output signals are respectively sent from the right turn signal switch storage circuit 4a to the right gate circuit 3a, and the right gate circuit 3a outputs a pulse signal generated when the steering wheel is rotating to the left, that is, The left gate circuit 3b outputs a pulse signal when the steering handle is turned back during a right turn operation, that is, a pulse signal generated when the steering handle is rotating in the right direction, that is, the steering handle during a left turn operation. The pulse signals at the time of switching back are passed respectively. 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. The pulse shaping circuit 5 is composed of a differentiating circuit and an integrating circuit as shown in FIG. 2 and is for producing a pulse signal having a constant width. A comparison circuit 6 is connected to the pulse shaping circuit 5, and it is determined whether or not the transmitted pulse signal exceeds a preset number of pulses, and when it exceeds a set value, a reset signal is output. It is supposed to be emitted. As shown in FIG. 2, the comparison circuit 6 uses a capacitor 7 to store the pulse signal sent thereto in the capacitor 7 and output a reset signal when the value exceeds a certain value. On the other hand, in the figure, 8a is a right turn signal switch, and 8b is a left turn signal switch, which are respectively connected to the set input terminals of the turn signal switch memory circuits 4a and 4b. The turn signal switch storage circuits 4a and 4b are composed of flip-flops, the reset input terminals are connected to the above-mentioned comparison circuit 6, and the reset signal is sent from the comparison circuit 6. 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 to cancel the start of blinking operation. In the figure, the turn signal lamp 10
It is a flasher unit for blinking a and 10b. Further, reference numeral 12 in the drawing is a reset switch, which is connected to the reset input terminals of the turn signal switch storage circuits 4a and 4b so that the turn signal lamps 10a and 10b can be manually canceled.

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

To turn the car right or left, first move the car according to the curvature of the road in the direction in which you are going to turn, rotate the steering wheel, turn it back, turn the steering wheel back, and return to the original position, ending a series of operations. However, the operation will be described by taking the case of a right turn as an example. When the right turn signal switch 8a is turned on for the right turn, the right turn signal relay 9a is excited and the right turn signal lamp 10a blinks. Start. On the other hand, when the driver makes a right turn and starts to rotate the steering handle to the right, the steering angle sensor 1 starts sending a pulse signal generated by the rotation to the right to the steering handle rotation direction detection circuits 2a and 2b. In this case, the right rotation pulse signal is input to the reset input terminal of the steering wheel rotation direction detection circuit 2a on the right side and the set input terminal of the steering wheel rotation direction detection circuit 2b on the left side.
The left rotation pulse signal is sent to the set input terminal of the left steering wheel rotation direction detection circuit 2b and the set input terminal of the right steering handle rotation direction detection circuit 2b, respectively, and the right rotation pulse signal is issued. Then, a pulse signal is output from the steering wheel rotation direction detection circuit 2a on the right side toward the gate circuit 3a, but a signal is output to the other input terminal of the gate circuit 3a on the right side configured by an AND circuit. The gate cannot be opened because it has not been sent. Therefore, the right rotation pulse signal at the time of right turn is blocked from passing through the gate circuits 3a and 3b. Then, when the steering wheel is turned back after turning the corner, a pulse signal for leftward rotation is generated, and this pulse signal is sent to the steering wheel rotation direction detection circuit 2b, and this steering wheel rotation direction detection circuit 2b. Is input to the gate circuit 3b on the left side. The pulse signal in the left direction is also sent to the steering wheel rotation direction detection circuit 2a on the right side, but since this detection circuit 2a acts as a reset input, it is not output from this detection circuit 2a. On the other hand, since a signal is also sent to the gate circuit 3b from the right turn signal switch storage circuit 4a, when the rotation for switching back is started, it means that the two inputs are complete, and the gate is opened and the pulse signal is output. Are sent to the pulse shaping circuit 5. That is, in the case of a right turn, the pulse signal for left rotation at the time of switching back and the pulse signal for right rotation in the case of left turn pass through the gate 3a or 3b, respectively. The cutback pulse signal that has passed through the gate 3 a is waveform shaped by the pulse shaping circuit 5, shaped into a pulse having a constant width, and sent to the comparison circuit 6. The comparison circuit 6 is a circuit for comparing and judging whether or not the number of pulse signals sent has exceeded a preset number, and a reset signal is issued when the number of input pulse signals exceeds a set value. . The set value preset in the comparison circuit 6 is determined on the basis of the number of pulses which corresponds to the rotation amount of the steering wheel normally rotated at the time of turning back. When the input pulse exceeds this set value, the comparison circuit 6 judges that the switching back is 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 this turn signal switch memory circuit 4a releases the excitation of the turn signal relay 9a and cancels the blinking of the right turn signal lamp 10a. In the case of a left turn as well, in the same manner as this, comparison of pulse signals at the time of switching back and output of a reset signal, turn signal relay 9
The excitation of b is canceled and the blinking of the turn signal lamp 10b is canceled.

Even when 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 released and the blinking of the turn signal lamp 10a or 10b is canceled. be able to.

〔The invention's effect〕

The electronic turn signal auto canceller according to the present invention has the structure as described above, and electrically detects the rotation direction and the amount of rotation of the steering wheel by the steering angle sensor, thereby canceling the turn signal. There is no operating noise like a mechanical type, there is no danger of malfunction,
A stable function can always be maintained.

In addition, since the steering angle sensor widely used for suspension control, seat belt control, etc. is used and it is not necessary to use a dedicated sensor, it can be mounted on a vehicle at low cost and its reliability is extremely high. Further, unlike the conventional device, it does not require two independent control circuits for the rightward system and the leftward system, and only one comparator circuit for both right and left needs to be provided, and the circuit can be simplified and adjusted. It is simple, durable, and reliable, and has a great practical effect. In addition, since the lighting of the turn signal lamp is electrically canceled, it is possible to freely choose the installation location, shape, type, etc. of each switch, and it is possible to more freely design the automobile. Also has.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of an electronic turn signal auto canceller according to the present invention, and FIG.
The figure is a specific electric circuit diagram thereof. 1 ... Rudder angle sensor, 2a ... Steering wheel rotation direction detection circuit (right), 2b ... Steering wheel 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, 8a ... Turn signal switch (right), 8b
… Turn signal switch (left), 9a… Turn signal relay (right), 9b… Turn signal relay (left),
10a ... turn signal lamp (right), 10b ... turn signal lamp (left), 11 ... flasher unit,
12 ... Reset switch

Claims (1)

[Claims] 1. A steering angle sensor 1 for outputting a pulse signal according to a rotation amount and a rotation direction of a steering wheel, and a reverse direction signal generated when the steering wheel is turned back by receiving a signal from the steering angle sensor 1. The number of pulse signals input from the pair of gate circuits 3a and 3b for passing only pulse signals and the gate circuits 3a and 3b and sent when the steering wheel is turned back exceeds a preset value. An electronic turn signal auto canceller, comprising: a comparator circuit 6 that issues a reset signal when the turn signal relays 9a and 9b are de-energized.