CN210652983U - Vehicle-mounted electronic reversing detection control circuit - Google Patents
Vehicle-mounted electronic reversing detection control circuit Download PDFInfo
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- CN210652983U CN210652983U CN201921839936.8U CN201921839936U CN210652983U CN 210652983 U CN210652983 U CN 210652983U CN 201921839936 U CN201921839936 U CN 201921839936U CN 210652983 U CN210652983 U CN 210652983U
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Abstract
The utility model provides a vehicle-mounted electron detection control circuit that backs a car, including connect in the detection line of backing a car of the line of backing a car with connect in the host computer of the detection line of backing a car, the output of the detection line of backing a car is connected with first circuit and second circuit, by first circuit to host computer output state signal that backs a car when the detection line that backs a car outputs the high level, by second circuit to host computer output state signal that backs a car when the detection line that backs a car outputs the low level, when the detection line output suspension that backs a car, the host computer detects the non state signal that backs a car. The utility model discloses a this circuit can improve the vehicle-mounted multimedia and to the motor vehicle of different grade type compatibility of detecting of backing a car, makes the car of vehicle-mounted multimedia system adaptation in all high-low levels.
Description
Technical Field
The utility model belongs to the technical field of the car, especially, relate to a vehicle-mounted electronic detection control circuit that backs a car.
Background
The current market motor vehicle type is various, and many motor vehicle types all have the image of backing a car or the silence function of backing a car, and on-vehicle multimedia judges whether current motor vehicle is in the state of backing a car through the level state on the detection motor vehicle's the line of backing a car. However, when the motor vehicle reversing detection line is in a reversing state at present, the output of some motor vehicle reversing detection lines is H level, and the output of some motor vehicles reversing detection lines is L level when the motor vehicles are in the reversing state. Therefore, the vehicle-mounted multimedia is required to distinguish and design hardware designs of different motor vehicle reversing detection circuits, and the circuit compatibility of the multimedia is greatly reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the above-mentioned problem, a vehicle-mounted electronic detection control circuit that backs a car is provided.
In order to achieve the above purpose, the utility model adopts the following technical proposal:
the utility model provides a vehicle-mounted electronic detection control circuit that backs a car, including connect in the detection line of backing a car of the line of backing a car with connect in the host computer of detection line of backing a car, the output of the detection line of backing a car is connected with first circuit and second circuit, by first circuit to host computer output state signal of backing a car when the detection line of backing a car outputs the high level, by second circuit to host computer output state signal of backing a car when the detection line of backing a car outputs the low level, when the detection line output of backing a car hangs empty, the host computer receives the state signal of not backing.
In the vehicle-mounted electronic reverse detection control circuit, the first circuit includes a high level switch tube driven by a high level, the high level switch tube is connected with a level conversion circuit, the level conversion circuit is connected to the host, and when the high level switch tube is turned on, the level conversion circuit outputs a first level state to the host.
In the vehicle-mounted electronic reverse detection control circuit, the second circuit includes a low level switch tube driven by a low level, the low level switch tube is connected to the level conversion circuit, when the low level switch tube is turned on, the level conversion circuit outputs a first level state to the host, and when both the high level switch tube and the low level switch tube are turned off, the level conversion circuit outputs a second level state to the host.
In the vehicle-mounted electronic reverse detection control circuit, the first level state is a low level, and the second level state is a high level.
In the vehicle-mounted electronic reverse detection control circuit, the level conversion circuit includes a third triode, a base of the third triode is connected to the low level switch tube and the high level switch tube respectively, a collector of the third triode is connected to the host, a common end of the collector and the host is connected to a power supply end through a pull-up resistor, and an emitter of the third triode is connected to a ground end.
In the vehicle-mounted electronic reversing detection control circuit, the third triode is an NPN triode, and is turned on when a high level is input to a base electrode of the third triode, so that the level conversion circuit outputs a low level to the host, and otherwise, outputs a high level to the host.
In the vehicle-mounted electronic reversing detection control circuit, the high-level switch tube includes a first triode, the first triode is an NPN triode, a base of the first triode is connected to the reversing detection line, a collector of the first triode is connected to the power supply end, and an emitter of the first triode is connected to a base of the third triode.
In the vehicle-mounted electronic reversing detection control circuit, the low-level switch tube comprises a second triode, the second triode is a PNP triode, a base of the second triode is connected to the reversing detection line, an emitter of the second triode is connected to the power supply end, and a collector of the second triode is connected to a base of a third triode.
In the vehicle-mounted electronic reverse detection control circuit, a 5.6V voltage regulator tube is connected between the base electrode of the first triode and the grounding end.
In the vehicle-mounted electronic reversing detection control circuit, the base of the first triode is connected to the reversing detection line through a first diode, and the base of the second triode is connected to the reversing detection line through a second diode.
The utility model has the advantages that: the circuit can improve the compatibility of the vehicle-mounted multimedia to the reversing detection of different types of motor vehicles, so that the vehicle-mounted multimedia system is adaptive to all high and low level automobiles.
Drawings
Fig. 1 is a circuit structure diagram of the vehicle-mounted electronic reverse detection control circuit of the utility model.
Reference numeral first circuit 1; a second circuit 2; a level shift circuit 12.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The embodiment discloses a vehicle-mounted electronic reversing detection control circuit, which comprises a reversing detection line connected to a reversing line and a host connected to the reversing detection line, wherein a detection signal of the reversing detection line is received by one of IO (input/output) ports MCU/IO of the host.
Particularly, an output end BACK-CTL of the reverse detection line is connected with a first circuit 1 and a second circuit 2, when the reverse detection line outputs a high level, the first circuit 1 outputs a reverse state signal to the host, and the part is suitable for a motor vehicle which outputs a high level when the reverse gear is engaged, namely, BACK-H is ON; when the reverse detection line outputs a low level, a reverse state signal is output to the host machine by the second circuit 2, and the part is suitable for outputting a motor vehicle with a low level when the reverse gear is engaged, namely BACK-L is ON; no matter the motor vehicle with high level or low level is output by the backing detection line in the backing state, when the motor vehicle is not in the reverse gear state, the BACK-CTL is in a suspended state, the backing detection line detects that the motor vehicle is not in the backing state, and correspondingly, the host receives a non-backing state signal.
Specifically, the first circuit 1 includes a high-level switch tube driven by a high level, the high-level switch tube is connected to a level shift circuit 12, the level shift circuit 12 is connected to the host, and when the high-level switch tube is turned on, the level shift circuit 12 outputs a first level state to the host. Similarly, the second circuit 2 includes a low level switch tube driven by a low level, the low level switch tube is connected to the level shift circuit 12, when the low level switch tube is turned on, the level shift circuit 12 outputs a first level state to the host, and when both the high level switch tube and the low level switch tube are turned off, the level shift circuit 12 outputs a second level state to the host. The first circuit 1 and the second circuit 2 here each comprise said level shifting circuit 12.
The first level state is a low level, the low level is a reversing state signal, the second level state is a high level, and the high level is a non-reversing state signal.
Specifically, the level shift circuit 12 includes a third transistor Q3, a base of the third transistor Q3 is connected to the low-level switch tube and the high-level switch tube, respectively, a collector of the third transistor Q3 is connected to the host, a common end of the collector and the host is connected to the power supply terminal VCC-5V through a pull-up resistor R6, and an emitter of the third transistor Q3 is connected to the ground terminal GND.
Further, the third transistor Q3 is an NPN transistor with a model 2N3904, and when a high level is input to the base of the third transistor Q3, the third transistor Q3 is turned on, so that the level shift circuit 12 outputs a low level to the host, otherwise, outputs a high level to the host.
Specifically, the high-level switch tube includes a first triode Q1, the first triode Q1 is an NPN triode with a model number of 2N3904, a base of the first triode Q1 is connected to an output terminal BACK-CTL of the reverse detection line, a collector is connected to a power supply terminal VCC-5V, and an emitter is connected to a base of the third triode Q3.
Similarly, the low-level switch tube comprises a second triode Q2, the second triode Q2 is a PNP triode with the model number of 2N3906, the base of the second triode Q2 is connected to the output terminal BACK-CTL of the reverse detection line, the emitter is connected to the power supply terminal VCC-5V, and the collector is connected to the base of the third triode Q3.
Further, the base of the first triode Q1 is connected to the output terminal BACK-CTL of the reverse detection line through a first diode D1, and the base of the second triode Q2 is connected to the output terminal BACK-CTL of the reverse detection line through a second diode D2. The first diode D1 and the second diode D2 are IN4001, the first diode D1 faces the first triode Q1, and the second diode D2 faces the output end BACK-CTL of the reverse detection line.
Preferably, a 5.6V voltage regulator ZD1 is connected between the base of the first transistor Q1 and the ground GND, so that the emitter output is still stable at 5V, and the third transistor Q3 is turned on.
The working principle of the utility model is as follows:
1. the BACK-CTL is an output level (some are high level 12V, some are low level grounding) when the motor vehicle is in reverse gear, and the MCU/IO is a host port (the low level input MCU/IO end is effective).
2. When a low level (grounding) is output during reverse gear, the second triode Q2 is conducted, the third triode Q3 is further conducted, and the MCU/IO end receives a low level signal; when the high level (12V) is connected during reverse gear, the first triode Q1 is conducted, so that the Q3 is conducted, and the MCU/IO end detects the low level.
3. When the BACK-CTL is not in the reverse gear state, the BACK-CTL is in a floating state, the first triode Q1 and the second triode Q2 are both in a cut-off state, the third triode Q3 is cut off, and the MCU/IO end detects a high level, namely the BACK-CTL is not in the reverse gear state.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the invention or exceeding the scope of the invention as defined in the appended claims, the invention being intended to include direct and indirect connections.
Although the first circuit 1 is used more here; a second circuit 2; level shifter 12, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.
Claims (10)
1. The utility model provides a vehicle-mounted electronic detection control circuit that backs a car, including connect in the detection line of backing a car of the line of backing a car with connect in the host computer of detection line of backing a car, its characterized in that, the output of the detection line of backing a car is connected with first circuit (1) and second circuit (2), by first circuit (1) to host computer output state signal of backing a car when the detection line of backing a car outputs the high level, by second circuit (2) to host computer output state signal of backing a car when the detection line of backing a car outputs the low level, when the detection line output of backing a car hangs empty, the host computer receives the state signal of not backing a.
2. The vehicle-mounted electronic reverse detection control circuit according to claim 1, wherein the first circuit (1) comprises a high level switch tube driven by a high level, the high level switch tube is connected with a level shift circuit (12), the level shift circuit (12) is connected to the host, and when the high level switch tube is turned on, the level shift circuit (12) outputs a first level state to the host.
3. The vehicular electronic reverse detection control circuit according to claim 2, wherein the second circuit (2) comprises a low level switch tube driven by a low level, the low level switch tube is connected to the level shift circuit (12), when the low level switch tube is turned on, the level shift circuit (12) outputs a first level state to the host, and when both the high level switch tube and the low level switch tube are turned off, the level shift circuit (12) outputs a second level state to the host.
4. The vehicle-mounted electronic reverse detection control circuit according to claim 3, wherein the first level state is a low level, and the second level state is a high level.
5. The vehicular electronic reverse detection control circuit according to claim 4, wherein the level conversion circuit (12) comprises a third triode, a base of the third triode is connected to the low level switch tube and the high level switch tube respectively, a collector of the third triode is connected to the host, a common end of the collector and the host is connected to the power supply terminal through a pull-up resistor, and an emitter of the third triode is connected to the ground terminal.
6. The vehicular electronic reverse detection control circuit according to claim 5, wherein the third triode is an NPN triode, and when a high level is input to a base of the third triode, the third triode is turned on, so that the level conversion circuit (12) outputs a low level to the host, otherwise, the level conversion circuit outputs a high level to the host.
7. The vehicle-mounted electronic reverse detection control circuit according to claim 6, wherein the high-level switch tube comprises a first triode, the first triode is an NPN triode, a base of the first triode is connected to the reverse detection line, a collector of the first triode is connected to the power supply terminal, and an emitter of the first triode is connected to a base of the third triode.
8. The vehicular electronic reverse detection control circuit according to claim 7, wherein the low level switch tube comprises a second triode, and the second triode is a PNP triode, a base of the second triode is connected to the reverse detection line, an emitter of the second triode is connected to the power supply terminal, and a collector of the second triode is connected to a base of a third triode.
9. The vehicle-mounted electronic reversing detection control circuit according to claim 8, wherein a 5.6V voltage regulator tube is connected between a base electrode of the first triode and a ground terminal.
10. The vehicle-mounted electronic reverse detection control circuit according to claim 9, wherein a base of the first triode is connected to the reverse detection line through a first diode, and a base of the second triode is connected to the reverse detection line through a second diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921839936.8U CN210652983U (en) | 2019-10-30 | 2019-10-30 | Vehicle-mounted electronic reversing detection control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921839936.8U CN210652983U (en) | 2019-10-30 | 2019-10-30 | Vehicle-mounted electronic reversing detection control circuit |
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| CN210652983U true CN210652983U (en) | 2020-06-02 |
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| CN201921839936.8U Active CN210652983U (en) | 2019-10-30 | 2019-10-30 | Vehicle-mounted electronic reversing detection control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112051463A (en) * | 2020-08-07 | 2020-12-08 | 广州亚美智造科技有限公司 | Vehicle-mounted diagnosis system plug detection circuit and vehicle management system |
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2019
- 2019-10-30 CN CN201921839936.8U patent/CN210652983U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112051463A (en) * | 2020-08-07 | 2020-12-08 | 广州亚美智造科技有限公司 | Vehicle-mounted diagnosis system plug detection circuit and vehicle management system |
| CN112051463B (en) * | 2020-08-07 | 2023-08-11 | 亚美智联数据科技有限公司 | Plug detection circuit of vehicle-mounted diagnosis system and vehicle management system |
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