What is the small square on the windshield?
1 Answers
This is a sunlight sensor. The sunlight sensor is used in vehicles to detect the intensity of light outside the vehicle. The vehicle control system uses the light intensity detected by the sunlight sensor to control the activation and deactivation of the onboard air conditioning system and adjust the airflow. Sunlight sensors are commonly used in air conditioning systems and can also be utilized for time display. Below is an introduction to the sunlight sensor in vehicles: 1. Commonly used in air conditioning systems: By measuring the intensity of the sun's "thermal radiation," the sunlight sensor transmits the collected signal (light intensity signal) to the main control ECU (control unit) or the air conditioning control ECU (depending on the vehicle model). The ECU control unit comprehensively compares, calculates, and evaluates the intensity of sunlight and the ambient (indoor and outdoor) temperature signals to accurately determine a more reasonable indoor environmental temperature (increase or decrease). This allows the control of "airflow speed" (high or low) or "airflow direction" to automatically adjust the air conditioning for optimal thermal comfort. 2. For time display: With the increasing advancement of vehicles, there is a greater emphasis on environmental protection and energy efficiency. The sunlight sensor signal can be converted into a digital circuit signal and then into time (clock). This is a technology that is already in use and will be widely adopted in the future. Currently, it can be found in many mid-range, high-end, and imported vehicle models.
