TL960 SERVICE MANUAL
Caterpillar 3126B Product News
Higher Injection Pressures
An intensifier piston in the HEUI injector multiplies hydraulic force on the plunger. By varying hydraulic input pressure, injection pressure can be controlled in a range from 5,000 to 21,000 psi. These high pressures are available at idle as well as high engine speeds. The higher injection pressures improve fuel economy, performance, and emission capabilities.
HEUI System Components
Electronic Control Module (ECM): The ECM is a microprocessor based system which monitors various inputs and sensors from the vehicle and engine as it controls the operation of the entire fuel system. It contains information defining optimum fuel system operational parameters. The ECM also has many more external operational inputs than a mechanical governor such as engine speed, timing, rail pressure, boost pressure, etc. It can determine optimum fuel rate and injection timing for any condition. It sends a precisely controlled signal to energize the injector solenoid.