The dem (dynamic engine management) on the Volvo XC90 is a system that helps to improve the vehicle's fuel efficiency, performance, and emissions. It does this by adjusting the engine's timing and fuel injection based on the current driving conditions.
The dem system uses a variety of sensors to monitor the vehicle's performance, including:
* Engine speed
* Intake air temperature
* Coolant temperature
* Vehicle speed
* Transmission gear
Based on the information from these sensors, the dem system makes adjustments to the engine's timing and fuel injection to optimize its performance. For example, the dem system may retard the engine's timing to reduce fuel consumption during highway driving, or advance the timing for improved performance during acceleration.
The dem system also helps to reduce emissions by adjusting the engine's air-fuel ratio to minimize unburned hydrocarbons and nitrogen oxides (NOx).
Overall, the dem system on the Volvo XC90 is a sophisticated technology that helps to improve the vehicle's fuel efficiency, performance, and emissions.
