CN113543427B - Flash unit - Google Patents
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- CN113543427B CN113543427B CN202110666877.4A CN202110666877A CN113543427B CN 113543427 B CN113543427 B CN 113543427B CN 202110666877 A CN202110666877 A CN 202110666877A CN 113543427 B CN113543427 B CN 113543427B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/105—Controlling the light source in response to determined parameters
- H05B47/14—Controlling the light source in response to determined parameters by determining electrical parameters of the light source
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
- B60Q1/34—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating change of drive direction
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/20—Responsive to malfunctions or to light source life; for protection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
- Stroboscope Apparatuses (AREA)
Abstract
The invention discloses a flash unit, comprising: the system comprises a main control module, a plurality of switch acquisition modules and a plurality of driving modules; wherein, each drive module includes: the first field effect transistor and the reverse electromotive force prevention module; the main control module is connected with a power supply; one end of each switch acquisition module is connected with a turn light switch, and the other end of each switch acquisition module is connected with the main control module; the grid electrode of the first field effect tube is connected with the main control module, the source electrode of the first field effect tube is connected with the steering lamp, and the drain electrode of the first field effect tube is connected with the power supply; the main control module is used for controlling the conduction of the first field effect tube of the corresponding driving module after the switch acquisition module acquires the closing signal of the turn light switch; after the switch acquisition module acquires a turn-off signal of the turn light switch, the corresponding first field effect tube of the driving module is controlled to be cut off. The invention can avoid the problems of short circuit caused by contact bonding and damage of the flash unit caused by back electromotive force.
Description
Technical Field
The invention relates to the technical field of automobile electric appliances, in particular to a flash unit.
Background
The flash unit is driven by a relay and is called a contact flash unit. Although the cost of the flash unit with the contacts is low, the flash unit with the contacts has an inevitable defect that when the flash unit works, arc discharge must be generated between the contacts, the flash unit works for a long time, the temperature of the contacts rises, and materials between the contacts migrate to cause contact bonding. If short-circuited, the flash unit may be damaged, and in addition, the back electromotive force generated when the load is turned on and off may also damage the flash unit.
Disclosure of Invention
The embodiment of the invention provides a flash unit, which can solve the problem that the existing flash unit is damaged due to contact bonding or back electromotive force.
An embodiment of the present invention provides a flash unit including: the system comprises a main control module, a plurality of switch acquisition modules and a plurality of driving modules; wherein each of the driving modules comprises: the first field effect transistor and the reverse electromotive force prevention module;
the main control module is connected with a power supply;
one end of each switch acquisition module is connected with a steering lamp switch, and the other end of each switch acquisition module is connected with the main control module;
the grid electrode of the first field effect tube is connected with the main control module, the source electrode of the first field effect tube is connected with the steering lamp, and the drain electrode of the first field effect tube is connected with the power supply;
the back electromotive force prevention module includes: the circuit comprises a first resistor, a second resistor, a first diode, a first voltage stabilizing diode and a second field effect transistor; the first end of the first resistor is connected with the power supply, and the second end of the first resistor is connected with the grid electrode of the second field effect transistor; the cathode of the first diode is connected with the steering lamp, and the anode of the first diode is connected with the source electrode of the second field effect transistor; the first end of the second resistor is connected with the source electrode of the second field effect transistor, and the second end of the second resistor is connected with the grid electrode of the second field effect transistor; the anode of the first voltage-stabilizing diode is connected with the source electrode of the second field-effect tube, and the cathode of the first voltage-stabilizing diode is connected with the grid electrode of the second field-effect tube; the drain electrode of the second field effect transistor is grounded;
the main control module is used for controlling the conduction of the first field effect transistor of the corresponding driving module after the switch acquisition module acquires a closing signal of the steering lamp switch; after the switch acquisition module acquires a turn-off signal of the turn light switch, the first field effect transistor of the corresponding driving module is controlled to be cut off.
Further, each of the driving modules further includes: a current detection module; one end of the current detection module is connected with the source electrode of the first field effect transistor, and the other end of the current detection module is connected with the main control module; the current detection module is used for detecting current and transmitting a detected current value to the main control module; and the main control module is used for carrying out fault diagnosis on the steering lamp according to the current value.
Further, the current detection module includes: a third resistor and a fourth resistor; the first end of the third resistor is connected with the source electrode of the first field effect transistor, and the second end of the third resistor is connected with the main control module; and the first end of the fourth resistor is connected with the second end of the third resistor, and the second end of the fourth resistor is grounded.
Further, the number of the switch acquisition modules is 3, and the switch acquisition modules are respectively a first switch acquisition module, a second switch acquisition module and a third switch acquisition module; the number of the driving modules is 4, and the driving modules are respectively a first driving module, a second driving module, a third driving module and a fourth driving module;
one end of the first switch acquisition module is connected with a left turn light switch, and the other end of the first switch acquisition module is connected with the main control module;
one end of the second switch acquisition module is connected with the right turn light switch, and the other end of the second switch acquisition module is connected with the main control module;
one end of the third switch acquisition module is connected with an electric lock ON gear switch, and the third switch acquisition module is connected with the main control module;
the first field effect tube of the first driving module is connected with a left steering lamp of the trailer;
the first field effect tube of the second driving module is connected with a right steering lamp of the trailer;
the first field effect tube of the third driving module is connected with a left steering lamp of the main vehicle;
and a first field effect tube of the fourth driving module is connected with a right steering lamp of the main vehicle.
Further, the device also comprises a power supply module; the main control module is connected with the power supply through the power supply module;
the first output control module and the second driving module further comprise a detection module power supply control module; the detection module power supply control module is connected with the corresponding current detection module, the main control module and the power supply module;
the main control module is used for controlling the power supply control modules in the first driving module and the second driving module to supply power to the corresponding current detection modules when the first switch acquisition module acquires an open signal of the left steering lamp switch, the second switch acquisition module acquires an open signal of the right steering lamp switch and the third switch acquisition module acquires a close signal of the electric lock ON-gear switch, so that the current detection modules in the first driving module and the second driving module perform current detection and transmit the detected trailer steering lamp current value to the main control module; the trailer steering lamp current values comprise a first trailer left steering lamp current value and a first trailer right steering lamp current value; and after receiving the current value of the steering lamp of the trailer, the main control module judges the connection fault of the electric circuit of the trailer and the main vehicle when any one of the current value of the left steering lamp of the trailer and the current value of the right steering lamp of the first trailer is smaller than a first preset current value.
Further, each of the detection modules includes: the circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first triode, a second triode and a first capacitor;
the first end of the fifth resistor is connected with the main control module, and the second end of the fifth resistor is connected with the base electrode of the first triode;
the first end of the sixth resistor is connected with the base electrode of the first triode, and the second end of the sixth resistor is grounded;
an emitting electrode of the first triode is grounded, and a collector electrode of the first triode is connected with the second end of the eighth resistor; the first end of the eighth resistor is connected with the base electrode of the second triode;
a first end of the seventh resistor is connected with an emitting electrode of the second triode, and a second end of the seventh resistor is connected with a base electrode of the second triode;
the emitter of the second triode is also connected with the power supply module, and the collector of the second triode is connected with the first end of the first capacitor; the second end of the first capacitor is grounded;
and the first end of the ninth resistor is connected with the collector of the second triode, and the second end of the ninth resistor is connected with the corresponding current detection module.
Further, the main control module is configured to perform fault diagnosis on the working state of the turn signal lamp according to the current value, specifically:
when the first switch acquisition module acquires a closing signal of the left steering lamp switch, the second switch acquisition module acquires an opening signal of the right steering lamp switch and the third switch acquisition module acquires a closing signal of the electric lock ON gear switch, the power supply control module in the first driving module is controlled to stop supplying power to the current detection module in the first driving module, and the first field effect transistors in the first driving module and the third driving module are controlled to be switched ON, so that the current detection modules in the first driving module and the third driving module perform current detection and transmit the detected current value of the left steering lamp to the main control module; wherein the left turn light current value comprises a second trailer left turn light current value and a main vehicle left turn light current value; after receiving the left steering lamp current value, the main control module carries out fault diagnosis on the trailer left steering lamp and the main vehicle left steering lamp according to the second trailer left steering lamp current value and the main vehicle left steering lamp current value;
when the first switch acquisition module acquires an open signal of the left steering lamp switch, the second switch acquisition module acquires a close signal of the right steering lamp switch and the third switch acquisition module acquires a close signal of the electric lock ON gear switch, the power supply control module in the second driving module is controlled to stop supplying power to the current detection module in the second driving module, and the first field effect transistors in the second driving module and the fourth driving module are controlled to be switched ON, so that the current detection modules in the second driving module and the fourth driving module perform current detection and transmit the detected value of the right steering lamp current to the main control module; wherein the right turn light current value comprises a second trailer right turn light current value and a main vehicle right turn light current value; and after receiving the right steering lamp current value, the main control module carries out fault diagnosis on the trailer right steering lamp and the main vehicle right steering lamp according to the second trailer right steering lamp current value and the main vehicle right steering lamp current value.
Furthermore, one end of the communication module is connected with the display module, and the other end of the communication module is connected with the main control module;
the main control module is further used for generating fault prompt information and transmitting the fault prompt information to the display module when the abnormal connection of the electric lines of the trailer and the tractor or the fault of any one steering lamp is judged, so that the display module displays the fault prompt information.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a flash unit, which is driven by a field effect transistor, so that the problem of short circuit caused by contact bonding is avoided, in addition, an anti-reverse electromotive force module is arranged in the flash unit, when reverse electromotive force is generated at the moment of switching on or switching off a steering lamp, a second field effect transistor is in a conducting state, and the reverse electromotive force flows back to the ground through a first diode and a second field effect transistor, so that the absorption of the reverse electromotive force is formed, the flash unit is prevented from being damaged by the reverse electromotive force, and the service life of the flash unit is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of a flash unit according to an embodiment of the present invention.
Fig. 2 is another schematic structural diagram of a flash unit according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of another structure of the flash unit according to an embodiment of the present invention.
Description of reference numerals: the flash unit 1, the driving module 11, the back electromotive force prevention module 111, the current detection module 112, the first driving module 21, the detection module power supply control module 211 of the second driving module, the second driving module 31, the third driving module 41, and the fourth driving module 51.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1: an embodiment of the present invention provides a flash unit 1 including: the system comprises a main control module, a plurality of switch acquisition modules and a plurality of driving modules 11; wherein, each of the driving modules 11 includes: a first field effect transistor T1 and an anti-back emf module 111;
the main control module is connected with a power supply;
one end of each switch acquisition module is connected with a turn light switch, and the other end of each switch acquisition module is connected with the main control module;
the grid electrode of the first field effect transistor T1 is connected with the main control module, the source electrode of the first field effect transistor T1 is connected with a turn light, and the drain electrode of the first field effect transistor T1 is connected with a power supply;
the back electromotive force prevention module 111 includes: a first resistor R1, a second resistor R2, a first diode D1, a first zener diode D2 and a second field effect transistor T2; a first end of the first resistor R1 is connected with the power supply, and a second end of the first resistor R1 is connected with the gate of the second field effect transistor T2; the cathode of the first diode D1 is connected with the turn light, and the anode of the first diode D1 is connected with the source of the second field effect transistor T2; a first end of the second resistor R2 is connected with the source electrode of the second field effect transistor T2, and a second end of the second resistor R2 is connected with the gate electrode of the second field effect transistor T2; the anode of the first voltage-stabilizing diode D2 is connected with the source of the second field effect transistor T2, and the cathode of the first voltage-stabilizing diode D2 is connected with the gate of the second field effect transistor T2; the drain electrode of the second field effect transistor T2 is grounded;
the main control module is configured to control the conduction of the first field effect transistor T1 of the corresponding driving module 11 after the switch acquisition module acquires the turn-on signal of the turn signal switch; after the switch acquisition module acquires the turn-off signal of the turn signal switch, the corresponding first field effect transistor T1 of the driving module 11 is controlled to be turned off.
In the embodiment shown in fig. 1, the power supply is an external battery power supply which supplies power to the flash unit 1; the switch acquisition module transmits a closing signal to the main control module after acquiring the closing signal of the turn signal switch, and the main control module controls the first field effect transistor T1 to be conducted to supply power to the turn signal after receiving the closing signal; after the switch acquisition module acquires the turn-off signal of the turn light switch, the turn-off signal is transmitted to the main control module, and the main control module controls the first field-effect tube T1 to stop supplying power to the turn light after receiving the turn-off signal, so that the control of the turn light is realized. On-off control is carried out through the field effect transistor, and the problem of short circuit caused by contact bonding is avoided.
When the reverse electromotive force is generated at the moment when the turn signal is turned on or off, the second fet T2 in the back electromotive force prevention module 111 is in a conducting state, and the reverse electromotive force flows back to the ground through the first diode D1 and the second fet T2, so that the absorption of the reverse electromotive force is formed, and the flash unit 1 is prevented from being damaged by the reverse electromotive force.
As shown in fig. 2, in a preferred embodiment, each of the driving modules 11 further includes: a current detection module 112; one end of the current detection module 112 is connected to the source of the first fet T1, and the other end of the current detection module 112 is connected to the main control module; the current detection module 112 is configured to perform current detection and transmit a detected current value to the main control module; and the main control module is used for carrying out fault diagnosis on the steering lamp according to the current value. Specifically, after receiving the current value, the main control module performs fault diagnosis on the steering lamp according to the current value, determines that the steering lamp is in a short circuit if the specific received current value is greater than a preset short-circuit current value, and determines that the steering lamp is in an open circuit if the received current value is less than a preset open-circuit current value. If a plurality of steering lamps are connected with the first field effect transistor T1, the received current can be compared with a preset lamp current shortage value, and if the received current value is smaller than the preset lamp current shortage value, the phenomenon that partial steering lamps are opened, namely the phenomenon of lamp shortage exists in the plurality of steering lamps connected with the first field effect transistor T1 is indicated.
Preferably, the specific circuit structure of each current detection module 112 is as shown in fig. 2, and includes a third resistor R3 and a fourth resistor R4; a first end of the third resistor R3 is connected with the source electrode of the first field effect transistor T1, and a second end of the third resistor R3 is connected with the master control module; the first end of the fourth resistor R4 is connected with the second end of the third resistor R3, and the second end of the fourth resistor R4 is grounded.
As shown in fig. 3, in a preferred embodiment, the number of the switch acquisition modules is 3, and the switch acquisition modules are respectively a first switch acquisition module, a second switch acquisition module and a third switch acquisition module; the number of the driving modules 11 is 4, and the driving modules are respectively a first driving module 21, a second driving module 31, a third driving module 41 and a fourth driving module 51; one end of the first switch acquisition module is connected with a left turn light switch, and the other end of the first switch acquisition module is connected with the main control module; one end of the second switch acquisition module is connected with the right turn light switch, and the other end of the second switch acquisition module is connected with the main control module; one end of the third switch acquisition module is connected with an electric lock ON gear switch, and the third switch acquisition module is connected with the main control module; the first field effect transistor T1 of the first driving module 21 is connected with a left turn light of a trailer; the first field effect transistor T1 of the second driving module 31 is connected with a trailer right steering lamp; the first field effect transistor T1 of the third driving module 41 is connected with a left turn light of the main vehicle; the first fet T1 of the fourth drive module 51 is connected to the main right turn signal. The on-off of 4 steering lamps (a trailer left steering lamp, a trailer right steering lamp, a main vehicle left steering lamp and a main vehicle right steering lamp) is controlled by the 4-way driving module 11.
In a preferred embodiment, the flash unit 1 further comprises a power supply module; the main control module is connected with the power supply through the power supply module;
the first driving module 21 and the second driving module 31 further comprise a detection module power supply control module; the detection module power supply control module is connected with the corresponding current detection module, the main control module and the power supply module;
the main control module is configured to control the detection module power supply control modules 211 in the first driving module 21 and the second driving module 31 to supply power to the corresponding current detection modules 112 when the first switch acquisition module acquires an off signal of the left turn light switch, the second switch acquisition module acquires an off signal of the right turn light switch, and the third switch acquisition module acquires an ON signal of the electric lock ON switch, so that the current detection modules 112 in the first driving module 21 and the second driving module 31 perform current detection and transmit detected trailer turn lamp current values to the main control module; the trailer steering lamp current values comprise a first trailer left steering lamp current value and a first trailer right steering lamp current value; and after receiving the current value of the steering lamp of the trailer, the main control module judges the connection fault of the electric circuit of the trailer and the main vehicle when any one of the current value of the left steering lamp of the trailer and the current value of the right steering lamp of the first trailer is smaller than a first preset current value. In addition, in this embodiment, a power supply module is added, and the power supply module converts the power supply of the whole vehicle, and converts the power supply (12V or 24V) of the whole vehicle into a 5V power supply to supply power to the main control module and other modules.
It should be noted that fig. 3 only shows specific circuit structures of the current detection module, the anti-back electromotive force module, and the detection module power supply control module in the first driving module, and specific circuit structures of the current detection module, the anti-back electromotive force module, and the detection module power supply control module in the other driving modules are consistent with those of the first driving module.
Taking the detecting module power supply control module 211 in the first driving module as an example, the detecting module power supply control module includes: a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first transistor T3, a second transistor T4, and a first capacitor C1;
a first end of the fifth resistor R5 is connected to the master control module, and a second end of the fifth resistor R5 is connected to the base of the first transistor T3;
a first end of the sixth resistor R6 is connected to the base of the first transistor T3, and a second end of the sixth resistor R6 is grounded;
the emitter of the first transistor T3 is grounded, and the collector of the first transistor T3 is connected to the second end of the eighth resistor R8; a first end of the eighth resistor R8 is connected with the base of the second triode T4;
a first end of the seventh resistor R7 is connected to the emitter of the second transistor T4, and a second end of the seventh resistor R7 is connected to the base of the second transistor T4;
the emitter of the second transistor T4 is further connected to the power supply module, and the collector of the second transistor T4 is connected to the first end of the first capacitor C1; the second end of the first capacitor C1 is grounded;
a first terminal of the ninth resistor R9 is connected to the collector of the second transistor T4, and a second terminal of the ninth resistor R9 is connected to the corresponding current detection module 112.
In this embodiment, when the electric lock ON switch is closed and the left and right turn signal switches are open, the vehicle is powered ON but the turn signal lamps are not operated, and at this time, the main control module of the flash unit 1 pulls up the potentials of the P31 port and the P32 port, so that the first transistor T3 and the second transistor T4 of the detection module power supply control modules in the first driving module 21 and the second driving module 31 are in a conducting state, and at this time, the current detection modules 112 in the two driving modules 11 are powered by the respective detection module power supply control modules, the current detection modules 112 are in an operating state, the current detection module 112 in the first driving module 21 detects the first left turn signal lamp current value, and then outputs the first trailer left turn signal lamp current value to the main control module through the P21 port, the current detection module 112 in the second driving module 31 detects the first trailer right turn signal lamp current value, and then outputs the first trailer right turn signal lamp current value to the main control module through the P22 port, the main control module compares the current value of the left turn light of the first trailer and the current value of the right turn light of the first trailer with a preset current value (namely the first preset current value), if the current value of the left turn light of the first trailer is smaller than the preset current value, the left turn light of the trailer is open-circuited, if the current value of the right turn light of the first trailer is smaller than the preset current value, the right turn light of the trailer is open-circuited, and whether the left turn light of the trailer or the right turn light of the trailer is open-circuited or not, the abnormal connection of the electrical circuits of the trailer and the (the main vehicle) is judged.
In a preferred embodiment, the main control module is configured to perform fault diagnosis on the working state of the turn signal lamp according to the current value, specifically:
when the first switch acquisition module acquires a closing signal of the left turn light switch, the second switch acquisition module acquires an opening signal of the right turn light switch, and the third switch acquisition module acquires a closing signal of the electric lock ON-gear switch, the detection module power supply control module 211 in the first driving module 21 is controlled to stop supplying power to the current detection module 112 in the first driving module 21, and the first field effect transistors T1 in the first driving module 21 and the third driving module 41 are controlled to be turned ON, so that the current detection modules 112 in the first driving module 21 and the third driving module 41 perform current detection and transmit the detected left turn light current value to the main control module; wherein the left turn light current value comprises a second trailer left turn light current value and a main vehicle left turn light current value; after receiving the left steering lamp current value, the main control module carries out fault diagnosis on the trailer left steering lamp and the main vehicle left steering lamp according to the second trailer left steering lamp current value and the main vehicle left steering lamp current value;
when the first switch acquisition module acquires an open signal of the left turn light switch, the second switch acquisition module acquires a close signal of the right turn light switch, and the third switch acquisition module acquires a close signal of the electric lock ON switch, the detection module power supply control module in the second driving module 31 is controlled to stop supplying power to the current detection module 112 in the second driving module 31, and the first field effect transistors T1 in the second driving module 31 and the fourth driving module 51 are controlled to be turned ON, so that the current detection modules 112 in the second driving module 31 and the fourth driving module 51 perform current detection and transmit the detected right turn light current value to the main control module; wherein the right turn light current value comprises a second trailer right turn light current value and a main vehicle right turn light current value; and after receiving the right turn light current value, the main control module carries out fault diagnosis on the trailer right turn light and the main vehicle right turn light according to the second trailer right turn light current value and the main vehicle right turn light current value.
Specifically, when the left turn light switch and the electric lock switch are simultaneously in a closed state, and the right turn light switch is in an open state, the main control module pulls down the potential of the P31 port, the first triode T3 and the second triode T4 of the detection module power supply control module 211 in the first driving module 21 are in a cut-off state, and at this time, the detection module power supply control module 211 in the first driving module 21 stops supplying power to the current detection module 112 in the first driving module 21; meanwhile, the potentials of the ports P11 and P13 of the main control module are pulled high, the first field effect transistors in the first driving module 21 and the third driving module 41 are in a conducting state, at this time, the left turn signal lamp of the trailer and the left turn signal lamp of the main vehicle are in a working state, the current detection modules 112 in the first driving module 21 and the third driving module 41 are also powered by the source electrodes of the corresponding first field effect transistors, the current detection modules 112 of the two modules are also in a working state, at this time, the current detection module 112 of the first driving module 21 detects the current value of the left turn signal lamp of the second trailer, and then the current value of the left turn signal lamp of the second trailer is output to the main control module through the port P21 of the main control module; the current detection module 112 of the third driving module 41 detects the left turn signal current value of the main vehicle, and then the left turn signal current value of the main vehicle is output to the main control module through the port P23 of the main control module; the main control module respectively judges whether the left turn light of the trailer and the left turn light of the main vehicle have faults (short circuit, open circuit and light lack) according to set values, and when the left turn light of the trailer and the left turn light of the main vehicle are in short circuit or open circuit, the output of the left turn light is immediately cut off through the first field effect transistor T1, so that the purpose of protecting the left turn light and the whole vehicle is achieved. For example: after the main control module receives the current value of the left turn light of the main car, if the left turn light of the main car is a single turn light, the current value of the left turn light of the main car is compared with a preset first threshold value, when the current value of the left turn light of the main car is larger than the first threshold value, the left turn light of the main car is judged to be in short circuit, when the current value of the left turn light of the main car is smaller than the second threshold value, the left turn light of the main car is judged to be in open circuit; wherein the first threshold is greater than the second threshold;
if the main car turn light consists of a plurality of turn lights, comparing the current value of the main car left turn light with a preset first threshold value, judging that the main car left turn light is in short circuit when the current value of the main car left turn light is larger than the first threshold value, comparing the current value of the main car left turn light with a preset second threshold value, judging that the main car left turn light is in open circuit when the current value of the main car left turn light is smaller than the second threshold value, comparing the current value of the main car left turn light with a preset third threshold value, and judging that the main car left turn light is in light shortage (namely, a part of the installed turn lights are in open circuit) when the current value of the main car left turn light is smaller than the third threshold value; wherein the first threshold > the third threshold > the second threshold;
when the right turn light switch and the electric lock switch are simultaneously in a closed state and the left turn light switch is in an open state, the main control module pulls down the potential of the P32 port, and at this time, the power supply control module of the detection module of the second driving module 31 stops supplying power to the current detection module 112 in the second driving module 31; meanwhile, the main control pulls the potentials of the ports P12 and P14 high, the first fets T1 in the second drive module 31 and the fourth drive module 51 are in a conducting state, at this time, the right turn light of the trailer and the right turn light of the main vehicle are in a working state, the current detection modules 112 in the second drive module 31 and the fourth drive module 51 are also powered by the source electrodes of the respective corresponding first fets, and the current detection modules 112 of the two modules are also in a working state; at this time, the current detection module 112 of the second driving module 31 detects a right turn light current value of the second trailer, and then outputs the right turn light current value of the second trailer to the main control module through the P22 port of the main control module; the current detection module 112 of the fourth driving module 51 detects the current value of the main vehicle right turn light, and then the current value of the main vehicle right turn light is output to the main control module through the port P24 of the main control module; the main control module respectively judges whether the right turn light of the trailer and the right turn light of the main vehicle have faults (short circuit, open circuit and light shortage) according to set values, and when the left turn light of the trailer and the right turn light of the main vehicle are in short circuit or open circuit, the output of the left turn light is immediately cut off through the first field effect tube T1, so that the purpose of protecting the left turn light and the main vehicle is achieved. The specific fault diagnosis method is the same as the fault diagnosis method for the left turn signal lamp of the main vehicle, and is not described herein again.
In a preferred embodiment, one end of the communication module is connected with the display module, and the other end of the communication module is connected with the main control module; the main control module is further used for generating fault prompt information and transmitting the fault prompt information to the display module when the abnormal connection of the electric lines of the trailer and the tractor or the fault of any one steering lamp is judged, so that the display module displays the fault prompt information.
The communication module is a CAN communication module, the display module is a vehicle instrument, and the main control module CAN be a singlechip; the single chip microcomputer can generate corresponding fault prompt information when detecting that the electric line connection between the trailer and the tractor is abnormal or any one of the steering lamps has a fault, and then the fault prompt information is sent to the vehicle instrument, and a user carries out corresponding processing according to the fault information displayed by the vehicle instrument.
The embodiment of the invention has the following beneficial effects:
1. the field effect tube is adopted to drive the steering lamp, so that the defect that contact bonding is easily caused by adopting a relay scheme can be avoided, and the cost is lower compared with that of adopting a mos intelligent chip;
2. the joint defense back electromotive force module is arranged, so that the back electromotive force generated when the load is switched on and off can be effectively absorbed, and the flash unit is prevented from being damaged by the back electromotive force.
3. The power supply to the current detection module adopts the detection module power supply control module, so that when the non-ON gear is ensured, the current detection module is in a non-working state, the quiescent current is reduced, and the storage battery feed caused by long-time parking of the vehicle is avoided.
4. The current detection module diagnoses the fault of the steering lamp, and when the steering lamp is in short circuit, the output can be timely closed through the field effect transistor, so that the flash unit and other equipment of the whole vehicle are prevented from being damaged.
5. The current detection module diagnoses the fault of the steering lamp and sends the fault to the instrument for displaying through the CAN bus.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (4)
1. A flash unit, comprising: the system comprises a main control module, a plurality of switch acquisition modules and a plurality of driving modules; wherein each of the driving modules comprises: the device comprises a first field effect tube, an anti-reverse electromotive force module, a current detection module and a power supply module;
the main control module is connected with a power supply;
one end of each switch acquisition module is connected with a turn light switch, and the other end of each switch acquisition module is connected with the main control module;
the grid electrode of the first field effect tube is connected with the main control module, the source electrode of the first field effect tube is connected with the steering lamp, and the drain electrode of the first field effect tube is connected with the power supply;
the anti-reverse electromotive force module includes: the circuit comprises a first resistor, a second resistor, a first diode, a first voltage stabilizing diode and a second field effect transistor; the first end of the first resistor is connected with the power supply, and the second end of the first resistor is connected with the grid electrode of the second field effect transistor; the cathode of the first diode is connected with the steering lamp, and the anode of the first diode is connected with the source electrode of the second field effect transistor; the first end of the second resistor is connected with the source electrode of the second field effect transistor, and the second end of the second resistor is connected with the grid electrode of the second field effect transistor; the anode of the first voltage-stabilizing diode is connected with the source electrode of the second field-effect tube, and the cathode of the first voltage-stabilizing diode is connected with the grid electrode of the second field-effect tube; the drain electrode of the second field effect transistor is grounded;
the current detection module includes: a third resistor and a fourth resistor; the first end of the third resistor is connected with the source electrode of the first field effect transistor, and the second end of the third resistor is connected with the main control module; the first end of the fourth resistor is connected with the second end of the third resistor, and the second end of the fourth resistor is grounded; the current detection module is used for detecting current and transmitting a detected current value to the main control module; the main control module is used for controlling the conduction of the first field effect tube of the corresponding driving module after the switch acquisition module acquires the closing signal of the turn light switch; after the switch acquisition module acquires a turn-off signal of the turn light switch, controlling a first field effect tube of a corresponding driving module to be cut off; carrying out fault diagnosis on the steering lamp according to the current value;
the number of the switch acquisition modules is 3, and the switch acquisition modules are respectively a first switch acquisition module, a second switch acquisition module and a third switch acquisition module; the number of the driving modules is 4, and the driving modules are respectively a first driving module, a second driving module, a third driving module and a fourth driving module;
one end of the first switch acquisition module is connected with a left turn light switch, and the other end of the first switch acquisition module is connected with the main control module;
one end of the second switch acquisition module is connected with the right turn light switch, and the other end of the second switch acquisition module is connected with the main control module;
one end of the third switch acquisition module is connected with an electric lock ON gear switch, and the third switch acquisition module is connected with the main control module;
the first field effect tube of the first driving module is connected with a left steering lamp of the trailer;
the first field effect tube of the second driving module is connected with a right steering lamp of the trailer;
the first field effect tube of the third driving module is connected with a left steering lamp of the main vehicle;
the first field effect tube of the fourth driving module is connected with the right steering lamp of the main vehicle;
the main control module is connected with the power supply through the power supply module;
the first driving module and the second driving module further comprise a detection module power supply control module; the detection module power supply control module is connected with the corresponding current detection module, the main control module and the power supply module;
the main control module is used for controlling the power supply control modules in the first driving module and the second driving module to supply power to the corresponding current detection modules when the first switch acquisition module acquires an open signal of the left steering lamp switch, the second switch acquisition module acquires an open signal of the right steering lamp switch and the third switch acquisition module acquires a close signal of the electric lock ON-gear switch, so that the current detection modules in the first driving module and the second driving module perform current detection and transmit the detected trailer steering lamp current value to the main control module; the trailer steering lamp current values comprise a first trailer left steering lamp current value and a first trailer right steering lamp current value; and after receiving the current value of the steering lamp of the trailer, the main control module judges the connection fault of the electric circuit of the trailer and the main vehicle when any one of the current value of the left steering lamp of the trailer and the current value of the right steering lamp of the first trailer is smaller than a first preset current value.
2. The flash unit of claim 1, wherein each of the detection module power control modules comprises: the circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first triode, a second triode and a first capacitor;
the first end of the fifth resistor is connected with the main control module, and the second end of the fifth resistor is connected with the base electrode of the first triode;
the first end of the sixth resistor is connected with the base electrode of the first triode, and the second end of the sixth resistor is grounded;
an emitting electrode of the first triode is grounded, and a collector electrode of the first triode is connected with the second end of the eighth resistor; the first end of the eighth resistor is connected with the base electrode of the second triode;
a first end of the seventh resistor is connected with an emitting electrode of the second triode, and a second end of the seventh resistor is connected with a base electrode of the second triode;
the emitter of the second triode is also connected with the power supply module, and the collector of the second triode is connected with the first end of the first capacitor; the second end of the first capacitor is grounded;
and the first end of the ninth resistor is connected with the collector of the second triode, and the second end of the ninth resistor is connected with the corresponding current detection module.
3. The flash unit of claim 2, wherein the main control module is configured to perform fault diagnosis on the operating state of the turn signal lamp according to the current value, specifically:
when the first switch acquisition module acquires a closing signal of the left steering lamp switch, the second switch acquisition module acquires an opening signal of the right steering lamp switch and the third switch acquisition module acquires a closing signal of the electric lock ON-gear switch, the power supply control module in the first driving module is controlled to stop supplying power to the current detection module in the first driving module, and the first field effect transistors in the first driving module and the third driving module are controlled to be switched ON, so that the current detection modules in the first driving module and the third driving module perform current detection and transmit the detected left steering lamp current value to the main control module; wherein the left turn light current value comprises a second trailer left turn light current value and a main vehicle left turn light current value; after receiving the left steering lamp current value, the main control module carries out fault diagnosis on the trailer left steering lamp and the main vehicle left steering lamp according to the second trailer left steering lamp current value and the main vehicle left steering lamp current value;
when the first switch acquisition module acquires an open signal of the left steering lamp switch, the second switch acquisition module acquires a close signal of the right steering lamp switch and the third switch acquisition module acquires a close signal of the electric lock ON-gear switch, the power supply control module in the second driving module is controlled to stop supplying power to the current detection module in the second driving module, and the first field effect transistors in the second driving module and the fourth driving module are controlled to be switched ON, so that the current detection modules in the second driving module and the fourth driving module perform current detection and transmit the detected right steering lamp current value to the main control module; wherein the right turn light current values include a second trailer right turn light current value and a master vehicle right turn light current value; and after receiving the right steering lamp current value, the main control module carries out fault diagnosis on the trailer right steering lamp and the main vehicle right steering lamp according to the second trailer right steering lamp current value and the main vehicle right steering lamp current value.
4. The flash unit of claim 3, further comprising a communication module; one end of the communication module is connected with the display module, and the other end of the communication module is connected with the main control module;
the main control module is further used for generating fault prompt information and transmitting the fault prompt information to the display module when the abnormal connection of the electric lines of the trailer and the tractor or the fault of any one steering lamp is judged, so that the display module displays the fault prompt information.
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| CN101229789A (en) * | 2007-09-30 | 2008-07-30 | 厦门金合捷投资控股有限公司 | Automobile steering lamp flashing controller and control method thereof |
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