JPS59231696A - Flash for vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a vehicular flashing device used, for example, to indicate the direction of an automobile. More specifically, the turn signal lights of a car should be activated to flash by operating a flasher switch (in response to an abnormal current caused by a short circuit or the like caused in the wiring connecting the flasher, the direction signal should be activated to indicate the occurrence of the abnormality) This detects by significantly changing the flashing ratio of the lamp. In other words, it significantly shortens the average energization time of overload current to prevent technical accidents due to heat generation, and also shortens the cycle of flashing operation. For example, it relates to a flashing device for a vehicle that can quickly turn on and notify the occurrence of an abnormality.

Conventional techniques and their problems Conventionally, as a method for detecting abnormal currents such as short-circuit currents caused in the wiring connecting automotive flashing devices, and countermeasures thereof, techniques such as those disclosed in Japanese Patent Publication No. 57/9978 have been proposed. It has been known. In other words, if a short circuit current flows through the connection wiring, 7
It was a mechanism that stopped the operation of the lasier circuit, stopped the blinking operation of the turn signal lights, and turned off the power circuit to notify of an abnormality. However, with such conventional vehicle flashing devices, when an overload current flows, the turn signal lights may suddenly stop even while driving, and the vehicle may be forced to continue driving. It had the disadvantage of causing an extremely dangerous situation in emergencies and the like.

Purpose of the present invention When this occurs, the flashing ratio of the direction indicator lights is significantly changed, in other words, the lighting time of the direction indicator lights is significantly shortened in the period in which the direction indicator lights blink, thereby shortening the average energization time of the load current. In addition to preventing the occurrence of secondary injuries caused by heat generation, etc., the number of blinking operations can be significantly accelerated to notify the occurrence of an abnormality, and even though it is not a normal blinking operation, it is possible to It is an object of the present invention to provide a flashing device for a vehicle that is extremely effective in practical use, such as being able to continue driving and thus making it possible to respond to emergency measures that require continuation of driving.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to FIG. 1, which is a preferred embodiment of a vehicle flashing device according to the present invention.

1 is a power source. 2 is a flasher switch. One of the flasher switches 2 is connected to the positive side of the power source 1 via the flasher unit 5fzr, and the other is connected to the left and right direction indicator lights 3 and 4. 5 is a flasher unit. The flasher unit 5 has terminals 5a and 5b connected to the positive and negative electrodes of the power source 1, and a terminal 5C connected to the flasher switch 2. The mechanism of the Fuji Rasha unit 5 is composed of an oscillation circuit section 7 and an overload current detection circuit section 11.

Here, the oscillation circuit section T is configured as follows. One of the coils 8 of the relay that operates intermittently is connected to the positive side of the power supply 1, and the other is connected to the power supply 1 through the second transistor T2.
is connected to the negative pole side of the □The emitter of the first transistor TI is connected to the positive side of the power supply 1, the base is connected to the positive side of the power supply 1 via the resistor R2 connected in parallel and the protective capacitor C2, and the collector is connected to the positive side of the power supply 1. One of the charging/discharging capacitors C is connected to the base of the transistor T1 via R4, and the other is further branched, and one is connected to the coil 8 and the collector of the second transistor T2 via the resistor R1. Ru. The other branched capacitor C1 is the resistor R33' of the overload current detection circuit section 11? : connected to the fifth transistor T through. Furthermore, the base of the first transistor T1 is connected to a terminal 5C connected to the flasher switch 2 via a resistor R3. second transistor T2
Is the base resistor R4? : through the first transistor T
1 collector.

Note that 9 is a protection diode, which is connected in parallel with the coil 8. 10 is a normally open contact of the relay, which is driven by the coil 8. Next, the configuration of the overload current detection circuit section 11 will be explained.

The bird is a resistor that detects the overload current by voltage, one is connected to the positive pole of the power supply 1, the other is branched (one to the emitter of the third transistor T3), the other is connected through the normally open contact 10 of the relay. from terminal 5C to flasher switch 2
connected to. R1 is a resistor, one of which is connected to the positive electrode of the power source 1, and the other connected to the base of the third transistor T3 via a diode 12 for temperature correction. The collector of the third transistor T3 is connected via a resistor R8 to the base of the fourth transistor T4, which is further connected via a resistor ReY to a terminal 5b connected to the negative pole of the power supply. Furthermore, a third transistor T
3 is connected to the terminal 5b via a resistor R1o. The collector of the fourth transistor T4 is connected and branched to the base of the fifth transistor T,
One side is resistance Ro'! The other terminal is connected to the positive terminal of the power supply 1 through the protective capacitor C3 and the resistor R1□ connected in parallel to the terminal 5b. T is the fifth transistor, and the collector is connected to the resistor Rxa y as described above.
The emitter is connected to the charging/discharging capacitor C1 of the oscillation circuit section 7 through the terminal 5b, and the emitter is connected to the negative electrode of the power source 1 through the terminal 5b.

Effect of the present invention The operation will be explained based on FIG.

First, a case will be described in which the blinking device is normal without any short-circuit accident or the like. Now, for example, when the flasher switch 2 is turned on by operating it to the left, the base current of the first transistor T1 flows from the positive terminal of the power supply 1 through the terminal 5aY to the resistor R3 and the terminal 5C, T,
is in the ON state.

Therefore, the first transistor TI, the resistor R4, the second
A current flows between the base of the transistor T2 and the second transistor T2 is also turned on. Thus, an exciting current flows through the relay coil 8, the normally open contact 10 is closed, and the direction indicator light 3 is turned on. In addition, the second transistor T2
When T becomes ON, the first transistor T, the capacitor C3, the resistor R1, the second transistor T2, and the terminal 5
Charging current via b, resistor R2, capacitor C1
The capacitor C1 is also charged by the current passing through the resistor R1, the 20th transistor T2, and the terminal 5b. Therefore, while the charging current is flowing, the first transistor T
, and the second transistor T2 are kept in the ON state,
When the first transistor T1 is charged to a predetermined amount with a time constant set by the capacitor C1 and the resistor R, the base current of the first transistor T1 gradually decreases and becomes OFF.

Therefore, the base current of the second transistor T2 is also cut off and it is turned off. As a result, the charging of the capacitor CI is stopped, and the excitation current of the relay coil 8 is also cut off, the relay contact 10 is turned off, and the direction indicator light 3 is turned off. Subsequently, the electric charge charged in the capacitor CI is routed through the resistor R2, the coil 8, the resistor R1, the resistor R3, the terminal 5C, the flasher switch 2, the direction indicator light 3, the power supply 1, the terminal 5a, the coil 8, and the resistor. Discharge occurs via a path via R1. As this discharge progresses, the flow of the discharge of the condenser CI flowing through the resistor R2 gradually decreases, and finally the potential on the base side of the first transistor T falls below the potential of the terminal 5a, so that the first transistor T, The base current flows and turns on, and then the second
The transistor T2 is also turned on, so that an exciting current flows through the coil 8, and the normally open contact 10 is turned on. mosquito(
Then, the direction indicator light 3 is turned on again, and the blinking operation is repeated.

Next, the operation of the overload current detection section 11 will be explained.

When a normal current within a predetermined range is flowing through the current detection resistor R6, the third transistor T is turned on in comparison with the resistor R7 connected to the base side. Therefore, the fourth transistor T4 is also turned on. However, the fifth
Since the potential of the base of the transistor T is low and close to the potential of the negative electrode of the power source 1, no base current flows and the OFF state is maintained. Therefore, the capacitor C of the oscillation circuit section 7
The connection from I to the collector of the fifth transistor T of the overload current detection section 11 via the resistor R13 is interrupted, and no current flows. Thus, when a normal load current is flowing through the resistor R6, the oscillation circuit section 7 operates the direction indicator light 3 in the preset normal intermittent operation as described above.
The flashing operation will be activated.

Next, connect the terminal 5C of the 7 lasher unit 5 to the flasher switch 2, the direction indicator light 3 (or 4), and then the power supply 1.
An abnormal state in which a short circuit occurs before the connection to the negative electrode of the terminal will be explained.

First, if an overcurrent exceeding a preset current value flows through the current detection resistor R6 due to a short circuit, the voltage drop across the resistor ■ (the voltage drop across the 6 terminals will be larger than in the normal case, so the third transistor T3 The potential on the emitter side decreases, no base current flows, and the transistor T3 is turned off.Therefore, the fourth transistor T4 is also turned off, and the fifth transistor T is turned on as the base current flows.
state. In this way, since the resistance value of the combined resistance of the resistor R33 becomes small, only the time to photoelectrically conduct the capacitor CI is shortened. Thus the capacitor CI
The direction indicator lamp 3 or 4, which blinks at the intermittent ratio of the oscillation circuit 7 which operates intermittently, has a lighting time,
In other words, only the time during which the load is energized is shortened, and at the same time, the blinking cycle is accelerated. In this way, the average energization time during which overload current flows is shortened, and a mechanism can be provided that can suppress heat generation and the like caused by the current. In addition, due to overcurrent due to short circuit etc., overcurrent detection circuit section 1
The intermittent ratio of the oscillation circuit section 7 that changes when 1 is activated is set by a time constant approximately determined by the values of the capacitor C1, the resistor R1, and the resistor R13, and can be selected as desired. .

Other embodiments of the invention Another embodiment of the present invention will be explained based on FIG. 2.

13 is an oscillation circuit section that oscillates at a frequency of one foot. 14
is a frequency divider that divides the waveform derived from the oscillation circuit into a desired frequency. Reference numeral 15 denotes an overload current detection circuit section, which, for example, as shown in Fig. 3 (cl), derives a predetermined high-level H signal during normal operation, and outputs a low-level L signal when an abnormal current flows due to a short circuit, etc. 16 is an OR circuit, 17 is a static circuit, and 18 is an amplifier circuit, which amplifies the signal derived from the M circuit 17 and outputs the direction indicator light ( The relay 19 is configured to operate a relay 19 that causes the light (not shown) to blink.

Next, its effect will be explained.

For example, through the frequency divider 14 having a predetermined frequency waveform derived from the oscillation circuit section 13,
As shown in b), signals of waveform Q1 and waveform Q2 are derived, and in addition to these respective signals, overload current detection circuit 1
5, for example, the high level signal H1 derived during normal operation as shown in FIG. For example, during normal operation, the waveforms 1 and 1 of FIG.
is derived, and in the case of an abnormality, a waveform 12 shown in FIG. 3(e) is derived. That is, it has a function that allows the direction indicator light to blink by turning on for 1/2 period in normal times and turning on for 1/4 period in abnormal conditions. In addition, the intermittent ratio of the signal waveform that causes the direction indicator light to blink can be determined by selecting two types of waveforms derived from the frequency divider 14, such that the 1/8 period is in the ON state, or the period is made longer with the same ON time. It has a mechanism that can easily be set as desired, such as reducing the number of flashes of the direction indicator light.

Effects of the present invention (a) When an overload current flows in the wiring of a vehicle flashing device due to a short circuit, etc., the flashing ratio and cycle of the direction indicator light are changed to notify the abnormality, and the flashing operation is caused by an overload current. Since the average energization time of the load current can be shortened, it is possible to provide a flashing device for a vehicle that can prevent abnormal heat generation and the like.

(b) Even if an overcurrent caused by a short circuit caused by wiring, etc. is detected, the blinking operation of the direction indicator light will not be stopped and will continue to blink to indicate an abnormal condition, so if you have no choice but to drive the car in an emergency etc. It is possible to provide a vehicular flashing device that is extremely effective in practical use and can provide a direction indicating function.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram showing an embodiment of a vehicle flashing device according to the present invention. FIG. 2 shows another embodiment of the vehicle flashing device according to the present invention.
FIG. FIG. 3 is a waveform diagram explaining the operation of the embodiment of FIG. 2, where (at and (bl are waveform diagrams derived by the frequency divider), (C
) is a waveform diagram derived by the overcurrent detection circuit, (dl is OR
Waveform diagram derived by the circuit, (el is a waveform diagram derived by the AND circuit. 2... Flasher switch, 5... Flasher -
Unit, 7, 13... Oscillation circuit section, 8... Coil, 11.15... Overcurrent detection circuit section. Mr. Mu Patent Applicant

Claims (1)

[Claims] A flashing device for a vehicle that flashes the vehicle's turn signal lights by operating a flasher switch includes an oscillation circuit that operates intermittently at a predetermined cycle, and a signal that detects overload current that exceeds a preset level. and an overload current detection circuit section that changes the intermittent ratio of the oscillation circuit section to shorten the average energization time of the load current (and also changes the cycle of blinking operation of the direction indicator light). Vehicle flashing device.