CN205573742U - Vehicle-mounted electronic ECU system with auto-detection function of brake lamp failure - Google Patents

Abstract

The utility model relates to an on-vehicle electron ECU system with car brake light fault automatic detection function, include: the automatic fault detection unit for the automobile brake lamp and the main processor module are arranged; still include in the car brake light trouble automatic checkout unit: the slave processor module is suitable for converting the fault judgment level into a serial port signal and sending the serial port signal to the master processor module; the main processor module is connected with the central control display module to reflect the working states of the left brake lamp and the right brake lamp; the utility model discloses a circuit structure of low-power consumption has realized all carrying out once detection to the brake lamp when stepping on the brake at every turn, has strong in real-time nature, and good reliability's advantage can in time discover the brake lamp trouble, avoids because the traffic accident that the brake lamp trouble caused.

Description

Vehicle-mounted electronic ECU system with auto-detection function of brake lamp failure

technical field

The utility model belongs to the technical field of automobile electronics, in particular to a vehicle-mounted electronic ECU system.

Background technique

Automobiles have become a means of transportation commonly used in people's daily lives. When an emergency occurs, drivers generally rely on visual signals (such as brake lights) to obtain warnings. Therefore, whether the brake lights are in good condition is one of the main measures to ensure driving safety. At present, the brake lights of most middle and low-end cars do not have an automatic fault detection function. When the brake lights break down, it is difficult for the driver to find out. During normal operation, the warning light automatically lights up to remind the driver to repair and replace the brake light in time, reducing rear-end collision accidents caused by brake light failure.

Utility model content

The purpose of the utility model is to provide an automatic detection unit for brake light failure of automobiles, so as to realize automatic detection of brake lights and feedback faults in time, so as to avoid automobile rear-end collision accidents caused by brake light failures.

In order to solve the above-mentioned technical problems, the utility model provides a vehicle-mounted electronic ECU system with an automatic detection function of a brake light failure of an automobile, comprising: an automatic detection unit for a failure of a brake light of an automobile, and a main processor module; The detection unit also includes: a slave processor module, which is suitable for converting the fault judgment level into a serial port signal and sending it to the main processor module; the main processor module is connected with the central control display module to reflect the left , The working status of the right brake light.

Further, the auto brake light fault automatic detection unit includes: left and right brake light detection modules, the circuit structures of the left and right brake light detection modules are the same, both include: a current detection circuit for detecting the brake light working current, A voltage comparison circuit connected to the current detection circuit, the voltage comparison circuit compares the output level of the current detection circuit with the reference voltage to obtain a fault judgment level, and connects the fault judgment level to the fault display circuit, To reflect the working status of the left and right brake lights.

Further, the current detection circuit includes: a current detection chip, the current input terminal of the current detection chip is connected to the power supply line of the brake light, and the current detection chip converts the obtained brake light working current into a corresponding output level; the voltage The comparison circuit includes: a voltage comparator, the non-inverting terminal of the voltage comparator is connected to the voltage output terminal of the current detection chip, and its inverting terminal is connected to a reference voltage, and the output terminal of the voltage comparator is suitable for driving One indicator light works; when the brake light fails, that is, when the current detection circuit does not detect the working current of the brake light, the output level of the current detection chip is lower than the reference voltage, and the voltage comparator outputs a fault judgment level as a low level, The indicator lights up.

The beneficial effect of the utility model is that the vehicle-mounted electronic ECU system of the utility model realizes a detection of the brake light every time the brake is stepped on through the circuit structure of low power consumption, which has strong real-time performance and good reliability The advantage is that it can detect the failure of the brake light in time and avoid traffic accidents caused by the failure of the brake light.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is the functional block diagram of the vehicle-mounted electronic ECU system of the present utility model;

Fig. 2 is a schematic circuit diagram of the automatic detection unit for brake light failure of the utility model.

detailed description

Now in conjunction with accompanying drawing, the utility model is described in further detail. These drawings are all simplified schematic diagrams, and only schematically illustrate the basic structure of the utility model, so they only show the configurations related to the utility model.

Example 1

As shown in Figure 1, a kind of vehicle-mounted electronic ECU system with auto brake light fault automatic detection function of the present utility model comprises: automobile brake light fault automatic detection unit, main processor module; Described automobile brake light fault automatic detection The unit also includes: a slave processor module, which is suitable for converting the fault judgment level into a serial port signal and sending it to the main processor module; the main processor module is connected with the central control display module to reflect the Working status of the right brake light.

The auto brake light fault automatic detection unit includes: left and right brake light detection modules, the left and right brake light detection modules are adapted to detect and respond to the working status of the left and right brake lights when the brake is stepped on.

The circuit structures of the left and right brake light detection modules are the same and both include: a current detection circuit for detecting the working current of the brake light, a voltage comparison circuit connected to the current detection circuit, and the voltage comparison circuit converts the output of the current detection circuit The level is compared with the reference voltage to obtain the fault judgment level, and the fault judgment level is connected to the fault display circuit to reflect the working status of the left and right brake lights.

As shown in Figure 2, specifically, the current detection circuit includes: a current detection chip, the current input end of the current detection chip is connected to the power supply line of the brake light, and the current detection chip converts the obtained brake light working current into a corresponding Output level; the voltage comparison circuit includes: a voltage comparator, the non-inverting end of the voltage comparator is connected to the voltage output end of the current detection chip, and its inverting end is connected to a reference voltage, and the output end of the voltage comparator It is suitable for driving an indicator light in the fault display circuit; when the brake light fails, that is, when the current detection circuit does not detect the brake light working current, the output level of the current detection chip is lower than the reference voltage, and the voltage comparator outputs a fault judgment When the level is low, the indicator lights up.

Further, the current detection chip is for example but not limited to the current detection chip ACS712, the reference voltage is for example but not limited to 2.6V; and the indicator light is for example but not limited to light-emitting diodes (LED1 and LED2).

Moreover, the auto brake light failure automatic detection unit is suitable for taking power from the vehicle battery, which includes a 5V voltage stabilizing module, such as but not limited to a 5V voltage stabilizing module composed of 7805.

On the basis of Embodiment 1, the working principle of the auto brake light fault automatic detection unit of the present invention will be described in detail.

(1) The left and right brake lights are normal, step on the brake S1, the two brake lights are on, the current passes through the left current detection chip U2 and the right current detection chip U3, the voltage output pin 7 of the two chips is 2.8V, the left voltage comparator U4 and The inverting input terminal of the right voltage comparator U4A is 2.6V, the non-inverting input terminal > the inverting input terminal, the output of the left voltage comparator U4 and the right voltage comparator U4A are both high level, and the light-emitting diodes LED1 and LED2 are off.

(2) One of the two brake lights is damaged (for example, the left brake light is broken). Because the left brake light is broken, when the brake S1 is stepped on, there is no current at the IP+ and IP- terminals of the left current detection chip U2, and its voltage output is 2.5 V, the inverting input terminal of the voltage comparator U4 is 2.6V, the positive input terminal is smaller than the inverting input terminal, the output of the voltage comparator U4 is low level, the red light-emitting diode LED1 is lit, indicating that the left brake light is broken, and it needs to be turned on in time Maintenance and replacement; the right current detection chip U3 current detection chip IP+, IP- has current, its voltage output is 2.8V, and the inverting input terminal of the voltage comparator U4A is 2.6V, so the positive phase input terminal of the voltage comparator U4A is greater than the negative phase input terminal. phase input terminal, the output of the voltage comparator U4A is high level, and the red light-emitting diode LED2 is off.

(3) Both brake lights are broken. When the brake S1 is stepped on, the IP+ and IP- of the left current detection chip U2 and the right current detection chip U3 have no current, and their voltage output is 2.5V. The voltage comparator U4 and the voltage comparator The inverting input terminal of U4A is 2.6V, so the positive-phase input terminals of the two voltage comparators are smaller than the inverting input terminals. Therefore, the two voltage comparators light up the two red light-emitting diodes, indicating that the two brake lights are broken. Replace it in time.

As shown in Figure 2, the automatic detection unit for brake light failure of the automobile has the following advantages

(1) The design of the 5V voltage regulator circuit requires the load current to be in milliampere level (low power consumption), and the load is a resistor divider circuit, which includes: resistor R2, resistor R3, resistor R1, resistor R4, red light-emitting diode LED1, red light-emitting diode Diode LED2; when the two brake lights are normal, the load is a resistor divider circuit, that is, resistor R2 and resistor R3, and its current is 0.24mA; when the left (right) brake light is broken, the load is a resistor divider circuit, that is, resistor R2 , resistor R3, resistor R1, red light-emitting diode LED1, the current is 25mA; when both brake lights are broken, the load is a resistor divider circuit, that is, resistor R2, resistor R3, resistor R1, red light-emitting diode LED1, resistor R4, red The current of the light-emitting diode LED2 is 50mA at this time, so the whole circuit is in a state of low power consumption (the maximum power consumption is less than 250 milliwatts).

(2) The design of the current comparison circuit requires that the resistance connected in series to the circuit must be small so as not to affect the brightness of the brake light. Therefore, a Hall effect current detection chip ACS712 with a range of ±5A is used. The input part of the chip is a piece of wire with a very small resistance. (1.2mΩ).

(3) The design of the voltage comparison circuit requires that when the two brake lights are normal, the corresponding light-emitting diodes will not light up, and they will light up when they are damaged. Therefore, the voltage comparator uses LM339, and its inverting input terminal voltage is designed to be 2.6V.

(4) The fault display circuit design requires that the light-emitting diode is a low-power light-emitting diode. In order to protect the light-emitting diode, the series resistance R4 is 120Ω.

Inspired by the above-mentioned ideal embodiment according to the utility model, and through the above-mentioned description content, relevant staff can completely make various changes and modifications within the scope of not deviating from the technical idea of the utility model. The technical scope of this utility model is not limited to the content in the description, but must be determined according to the scope of the claims.

Claims (3)

1., with a vehicle electronics ECU system for automobile brake lamp automatic failure detection function, its feature exists In, including: braking automobile lamp failure automatic detection unit, main processor modules；

Also include in described braking automobile lamp failure automatic detection unit: from processor module, should be from processor It is that rs 232 serial interface signal sends to main processor modules that module is suitable to breakdown judge level conversion；

Described main processor modules is connected with middle control display module, to react the duty of left and right brake lamp.

Vehicle electronics ECU system the most according to claim 1, it is characterised in that described braking automobile Lamp failure automatic detection unit includes: left and right brake lamp detection module, and the detection of described left and right brake lamp The circuit structure of module is identical, all includes:

For detecting the current detection circuit of brake lamp operating current, the voltage being connected with this current detection circuit Comparison circuit, this voltage comparator circuit by the output level of current detection circuit compared with reference voltage, with Obtain breakdown judge level, and this breakdown judge level is accessed to fault display circuit, to react left and right The duty of brake lamp.

Vehicle electronics ECU system the most according to claim 2, it is characterised in that described current detecting Circuit includes: current detecting chip, the current input terminal of this current detecting chip and the supply line of brake lamp Being connected, the brake lamp operating current of acquisition is converted to corresponding output level by this current detecting chip；

Described voltage comparator circuit includes: voltage comparator, the in-phase end of this voltage comparator and current detecting The voltage output end of chip is connected, and its end of oppisite phase accesses a reference voltage, and the output of this voltage comparator End is suitable to a display lamp job in driving malfunction display circuit；

Working as brake lights failure, when i.e. current detection circuit is not detected by brake lamp operating current, described electric current is examined The output level surveying chip is less than reference voltage, then voltage comparator output breakdown judge level is low level, Display lamp lights.