Sensors

Description:

Description:

Solar Sensor:

Outside Temperature Sensor

The outside temperature sensor is a temperature-sensitive resistor whose resistance varies inversely with temperature. As outside air temperature increases, resistance decreases. As outside air temperature decreases, resistance increases.

The HVAC programmer monitors the outside temperature signal and uses this information to display outside temperature on the heater and A/C control VF display and helps determine command signals.

In-Vehicle Temperature Sensor

The in-vehicle temperature sensor is a temperature-sensitive resistor like the outside temperature sensor. As outside air temperature increases, resistance decreases. As outside air temperature decreases, resistance increases.

A hose connected to the in-vehicle air temperature sensor continually draws passenger compartment air over the sensor, increasing the accuracy of the temperature reading.

The HVAC programmer monitors the in-vehicle temperature signal and uses this information to help determine command signals.

Solar Sensor

The solar sensor is a light-sensitive photo diode that monitors the heat load of the sun on the vehicle. The sensors are located on top of the instrument panel, on either side of the defroster grill, where sunlight can reach the sensors.

As sunlight intensity increases, resistance of the sensor decreases. As sunlight intensity decreases, resistance increases.

The HVAC programmer compares the solar sensor reading to the in-vehicle temperature reading and then determines how much cooling is required to reach and maintain the desired "SET" temperature.