CN202686095U - A device for automatically turning off the headlights of a car - Google Patents

Abstract

The utility model discloses a device for automatically closing the headlight of an automobile, which comprises a BCM, a headlight of the automobile, a headlight switch and a relay connected between the power supply and the headlight of the automobile, and the device for automatically closing the headlight of the automobile also includes a door lock Detection device, human body detection sensor, ignition switch detection device, headlight switch signal detection device. The utility model aims to provide a device that can automatically turn off the headlights of the car when the driver leaves the car without turning off the headlights during the day or at night, so as to prevent the headlights from exhausting the battery of the car. causing the car to fail to start.

Description

A device for automatically turning off the headlights of a car

technical field

The utility model relates to a device for controlling automobile headlights, in particular to a device capable of automatically closing the automobile headlights.

Background technique

With the development of economy and society and the improvement of people's living standards, cars have entered people's lives. Now more and more people buy cars, and cars will also be popularized in our country in the future. Cars bring convenience to people's travel, but they can also cause us troubles due to various reasons. When we drive to the destination, we turn off the car and leave the car, but due to negligence, we forget to turn off the headlights of the car, so that the battery of the car has been running Supplying power to the headlights will cause the battery to be negatively charged for a long time, and it will not be able to provide normal power for the next time the car is started, or even damage the battery.

China patent authorization announcement number: CN201863761U, authorization announcement date: June 15, 2011, discloses a device for automatically turning off the headlights of a car, the device includes a combination switch, a photosensitive sensor, an on-board computer and a relay, a combination switch and an ignition switch The input end of the car is connected to the output end of the car power supply, the output end of the combination switch, ignition switch and photosensitive sensor is connected to the input end of the on-board computer, the output end of the on-board computer is connected to the input end of the relay, and the output end of the relay is connected to the car headlight. When the driver leaves the car without turning off the headlights during the day, the car can automatically turn off the headlights. But this device also has deficiencies, the photosensitive sensor of this device only when detecting that the surrounding light intensity is lower than the preset value, the car headlights can be turned off, and in some time periods, when the driver leaves the car and forgets to turn off the headlights At this time, the light intensity is greater than the preset value and has not changed for a long time. At this time, the battery of the car will always supply power to the headlights of the car, resulting in serious power consumption of the battery, and even a negative power situation so that it cannot provide power for the next car start. power supply. the

Utility model content

The utility model is to overcome the deficiencies of the prior art and provides a device for automatically turning off the headlights of a car. No matter in the daytime or at night, when the driver leaves the car without turning off the headlights, the car can automatically turn off the headlights. Prevent the headlights from draining the battery of the car, causing the car to fail to start.

In order to achieve the above object, the utility model adopts the following technical solutions:

A device for automatically turning off the headlights of a car, including BCM, headlights, and a headlight switch and a relay connected between the power supply and the headlights of the car, the device for automatically turning off the headlights of the car also includes a door lock detection device, a human body detection device sensor, ignition switch detection device, headlight switch signal detection device, the output ends of the door lock detection device, human body detection sensor, ignition switch detection device, and headlight switch signal detection device are respectively connected to the input ends of the BCM, and the BCM The output end of the relay is connected with the relay, and the human body detection sensor is connected with the BCM. The door lock detection device is used to detect whether the door is closed, the ignition switch detection device is used to detect whether the key is pulled out, the headlight switch signal detection device is used to detect whether the headlights of the car are closed, and the human body detection sensor is used to detect whether there are people in the car. At the same time, the door lock detection device, ignition switch detection device, headlight switch signal detection device, and human body detection sensor send the detection results to BCM in the form of signals. If there is no one in the car, the door is closed, the key is pulled out and the headlights are not turned off, Then the BCM will send a command to the relay, the relay will disconnect the circuit, and the headlights will be turned off.

Preferably, a diode is connected in antiparallel to both ends of the relay. The diode connected in parallel at both ends of the relay acts as a protection. When the relay is disconnected, a counter electromotive force will be generated. This counter electromotive force is several times to dozens of times higher than the voltage of the pen power supply. This counter electromotive force will cause damage to other electrical components. , and a diode connected in antiparallel can absorb the back EMF and protect the circuit from working normally.

Preferably, the human body detection sensor is a weight sensor, which is arranged under the car seat. The weight sensor is used to detect whether there are people in the car, and send the detected information to the BCM. the

Preferably, the human body detection sensor is an infrared sensor, which is arranged on the top of the vehicle body. The infrared sensor is used to detect whether there are people in the car, and send the detected information to the BCM.

Compared with the prior art, the utility model has the following beneficial effects: easy to use, simple to operate, and good reliability. When there is no one in the car and the door is closed and the key is pulled out, if the headlights of the car are on, the car can be automatically turned off. Headlights to prevent the battery from being negatively charged so that the car cannot be started.

Description of drawings

Shown in Fig. 1 is the principle block diagram of the utility model.

In the figure, 1—door lock detection device, 2—ignition switch detection device, 3—human body detection sensor, 4—BCM, 5—relay, 6—headlight switch, 7—headlight switch signal detection device, 8—car headlight Lamp, 9—diode.

Detailed ways

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

A kind of auto headlight device for automatically closing as shown in Figure 1, comprises BCM4, automobile headlight 8, and the headlight switch 6 and relay 5 that are connected between power supply and automobile headlight 8, described automatic closing automobile headlight The device also includes a door lock detection device 1, a human body detection sensor 3, an ignition switch detection device 2, a headlight switch signal detection device 7, and the car door lock detection device 1, a human body detection sensor 3, an ignition switch detection device 2, and a headlight switch The output end of signal detection device 7 is connected with the input end of BCM4 respectively, and the output end of described BCM4 is connected with relay 5, and human body detection sensor 3 is interconnected with BCM4; The two ends of described relay 5 are antiparallel with a diode 9; Described human body detection sensor 3 is a weight sensor, is located at the following of the car seat.

More preferably, the human body detection 3 sensor is an infrared sensor, which is installed in the body of the car.

The relay in the utility model adopts the direct current light relay of 12V.

The working principle of the utility model is: when the car is turned off, the ignition switch detection device detects whether the key is pulled out, the headlight switch signal detection device detects whether the headlight is on, and the car door lock detection device detects whether the car door is closed, and sends the signal to BCM, if the BCM detects that the key is pulled out, the headlights are turned on and the doors are closed, then the BCM activates the seat sensor or infrared sensor to detect whether there is anyone in the car. If there is no one in the car, the seat sensor or infrared sensor will send the information to the BCM , at this time, the BCM sends an instruction to the relay, the relay disconnects the circuit, and the headlights of the car are turned off.

Claims (4)

1. A device for automatically closing the headlights of a car, comprising BCM, headlights, and a headlight switch and a relay connected between the power supply and the headlights of the car, characterized in that: the device for headlights of the car automatically closed also includes a car door Lock detection device, human body detection sensor, ignition switch detection device, headlight switch signal detection device, the output terminals of the door lock detection device, human body detection sensor, ignition switch detection device, headlight switch signal detection device are respectively connected with the input of BCM The terminal is connected, the output terminal of the BCM is connected with the relay, and the human body detection sensor is connected with the BCM. 2. The device for automatically turning off the headlights of an automobile according to claim 1, wherein a diode is connected in antiparallel to both ends of the relay. 3. The device for automatically turning off the headlights of a car according to claim 1, wherein the human body detection sensor is a weight sensor and is arranged under the car seat. 4. The device for automatically turning off the headlights of an automobile according to claim 1, characterized in that: the human body detection sensor is an infrared sensor, which is arranged on the top of the automobile body.

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