Cummins explains how engine sensors work, from pressure and temperature to NOx monitoring

Cummins describes the network of sensors and control units as the nerves and brain of an engine system. Sensors collect information and feed data to control units, which compare that data against optimal operating parameters and can signal actuators to adjust a component as needed. The company gives the example of checking exhaust manifold output to confirm whether fuel timing is working effectively, with actuators able to course correct if it is not.

Sensors optimize vehicle performance whatever the powertrain, Cummins says, whether diesel, natural gas, fuel cells or batteries. On commercial vehicles they monitor pressure, temperature, emissions, fluid quality, airflow and engine speed, providing real-time data that helps electronic control systems improve performance, reliability, fuel efficiency and emissions compliance. The company notes that while customers may know a sensor by its function, the technology inside can vary significantly with the application, supplier design and operating environment.

The sensor array differs by fuel source, depending on the conditions an engine must monitor, the environment the sensors work in, and the accuracy or functionality required. Cummins cites one example: natural gas engines need oxygen sensors, while diesel engines require NOx sensors. Regulations have also expanded the sensor types powertrains need, particularly around aftertreatment and onboard diagnostics.

Cummins says sensors do more than monitor performance: they generate the data that lets control systems make real-time decisions, support onboard diagnostics and help technicians spot potential issues before they grow. This connected approach matters more as the industry moves toward software-defined, data-driven vehicle systems, with inputs on temperature, pressure, vibration, resistance, fluid condition and emissions building a clearer picture of real-world engine performance. That insight supports more precise controls, improved serviceability, stronger prognostics and continued progress in reliability, efficiency and emissions performance. Cummins engineers work closely with suppliers to define rigorous specifications for sensor quality, durability and performance so sensors can survive demanding environments over the life of the engine.