The automatic headlight correction device helps to direct the light from the headlights in such a manner as to guarantee the driver excellent visibility and at the same time not to dazzle motorists moving in oncoming vehicles. Of course, such technology is not comparable with matrix headlights of Audi car, but it is also very effective in application. If you’ve already forgotten when your car had any headlights on it, turn it in for recycling. There’s no reason for it to stand in the backyard and get rusty:

The design and principle of operation of the headlight corrector

It is worth noting that the principle of operation of different types of headlight correctors is approximately the same. At the same time, distinguish between automatic and manual adjustment. In the latter version, the location of the headlights is regulated by a special regulator installed inside the car salon, and with the help of its rotation, the driver himself changes the angle of the optics. In the first case, the electronics automatically adjusts everything itself, depending on the car’s seating position. 

Manual headlight corrector

This kind of headlight corrector is installed on many budget cars, so it is familiar to a large number of motorists. As the name implies, the corrector is actuated directly by the driver. To do this, as a rule, you only need to turn the wheel, or as it is also called – rotary switch. Most often used electromechanical actuator headlight corrector, so we will consider it.

The adjusting wheel usually has a digital marking or graphic, which indicates the position of the headlights. Adjustment is made by the driver as necessary, depending on the load of the car and changes in its inclination in the longitudinal direction relative to the center of gravity.

Simply put, if three people sit on the back seat, and four bags of potatoes for the mother-in-law had to be put in the trunk, it is obvious that the back of the car will go down, and the front will rise, because of which the headlights will shine too high and will blind the drivers of oncoming traffic.

To prevent this from happening, you need to turn the knob so that the beam of light goes down.

Turning the knob gives the corresponding command to the gearmotor, which is needed to turn the headlight to a certain angle. In fact, the gearmotor is nothing but a worm gearbox, which is needed to convert the rotary motion of the electric motor (located inside the gearmotor) into a translational motion of the rod, which directly affects the headlamp, changing its angle of inclination.

Structurally, the headlamp is hinged at the top, and the rod holds the lower edge of the headlamp with a ball (resting on a spherical latch). And it is the movement back and forth of the lower part of the headlight, with the unchanged upper attachment point that gives the required change of tilt angle.

Manual headlight corrector is very simple, very reliable and most importantly – a useful device, but which has one very important disadvantage: most drivers forget to use it and blind their colleagues, despite the fact that they have the opportunity not to.

Automatic Headlight Correction System

Automatic headlight corrector is a more advanced technology, because it does not require any action from the driver. Adjustment of the light-shadow boundary occurs automatically on the basis of sensor readings.

Auto headlight corrector can be installed on cars equipped with either halogen or xenon headlights. For xenon it is even obligatory, since this type of headlights emits light of very high intensity, and in the absence of an autocorrector can pose a serious threat to traffic safety.

As for the design of the headlight autocorrector, the following elements can be distinguished:

control unit;

sensors that measure the clearance of the car in different points;

A device that performs the adjustment of headlights (actuator mechanism).

As a rule, the system uses two or three sensors that measure the value of ground clearance. Either one sensor or a pair can be installed at the front. And one sensor is in the back.

Early systems used potentiometric sensors, but they lacked reliability, so they have now been replaced by non-contact angle sensors.

These sensors are based on the Hall effect. Mechanism of operation of the sensor is quite simple.

Structurally, the sensor consists of a rotor (moving part), with permanent magnets built into it, and a stator (stationary part), which, in fact, is a Hall sensor.

The sensor is attached to the bottom, and is connected to the suspension by means of a rod. The change in suspension travel is transmitted via the linkage to the rotor, which rotates, causing a change in magnetic flux, which is picked up by the Hall sensor.

The amount of change in magnetic flux is then calculated by the control unit into the desired angle of rotation of the headlights and a signal is sent to the actuator. In its work, the control unit takes into account not only the angle of the car, but also the speed and the nature of the movement of the car.

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