ELECTRONICALLY-CONTROLLED PUMPS

An electronically-controlled or Common Rail pump can generate fuel rail pressures of up to 40,000psi

Cornell Diesel Systems explains that this offers a number of benefits over traditional mechanical diesel fuel systems as these high pressures improve the atomisation of the fuel, improving the combustion within the engine.
In addition to the increased fuel pressures, the electronically-controlled system improves the drivability performance, lowers fuel consumption, and provides for quieter and more efficient and emission-friendly engines.

The role of the ECU in the electronic control of pumps
Common Rail systems are controlled electronically, giving many more options for control and monitoring. An electronically controlled system has an electronic control unit (ECU), monitoring what the engine is doing using a number of sensors, and supplies the precise amount of fuel to the engine. The engine ECU – through its sensors – also monitors engine speed and load, and alters the fuel injection rate to deliver the right amount of power as it is needed.
Mechanical fuel systems use a more direct approach with a rotary or inline pump providing individual fuel bursts – one for each cylinder. This is normally controlled through a mechanical linkage to the timing or gears that opens the injectors and controls the fuel pressures.

Electronic Pump Servicing
Cornell Diesel Systems says it services a range of electronically-controlled pumps, including the Bosch VP44 (pictured).
It explains that the VP44 fuel pump is an electronic rotary pump that delivers a precise amount of fuel flow rate and electronic timing for the diesel engine. All of Cornell Diesel Systems’ exchange VP44 pumps are reportedly rebuilt using only genuine parts for the replacement of components and are tested and electronically calibrated on an authorised Bosch test bench. They also come with a full 12-month warranty.
Cornell Diesel Systems says it ensures its highly trained and experienced technicians are experts when it comes to service and repair of electronic common rail diesel systems. It says its technicians only use OEM parts and test to the highest OEM guidelines.
As the highest level of cleanliness is required when working with this technology, it says all electronic and fuel components are carefully handled and assembled within a pressurised pump room to maintain cleanliness to OEM standards.
Further, it says all of its electronic common rail pumps go through an extensive test process to verify any damage or fuel contaminant, with the technician conducting the following checks:
• Visible checks for damage
• Resistance check
• Partial break down to examine internal components and check for fuel contamination

For more information from Cornell Diesel Systems, email sales@cornells.com.au or call 03 9267 8800.