Diesel Electronic Unit Injector

The unit injector combines a high-pressure pump and nozzle with a solenoid valve to form compact assembly. As a result, high-pressure lines are no longer necessary and injection can be controlled by the integrated and extremely precise solenoid valve at pressures of up to 2000 bar. Each cylinder has a unit injector fitted between the valves in the cylinder head. The unit injector is used in both passenger cars and commercial vehicles. The Bosch Unit Injector system was first used in the VW Passat TDI in 1998, after which it rapidly found favour within the VW range. With the V10 TDI, VW recently presented what is currently the most powerful diesel engine for use in a car.

Diesel injection pump

Robert Bosch has contributed to Diesel In-Line Fuel-Injection Pumps: Bosch Technical Instruction as an author. Robert Bosch GmbH is ranked among the world's major equipment suppliers. The Bosch experts that make up the editorial team come from the relevant divisions of Bosch and are at the forefront of technical developments in their field. Bosch demonstrates its leading competence in automotive technology through the sheer number of its applications for patents and patented designs. inline pump

The diesel fuel pump is a fairly complex and sturdy mechanism. In fact, it is the most complex diesel engine part. Additionally, a diesel fuel pump must be durable enough that it can withstand the pressure of the compressed air, and the heat of the injection process. The fine mist of fuel needed for the proper ignition must be maintained by the diesel fuel pump under these extreme conditions. Diesel fuel pumps may be located just about anywhere on the engine, depending on the manufacturers design. Much experimentation has been done over the years regarding the most effective placement of the diesel fuel pump. So far it seems that so long as the pump is mounted on the engine, it will effectively deliver fuel to the cylinders. A gasoline fuel pump, on the other hand, may be mounted anywhere in the engine compartment or along the fuel distribution system. Depending on the location and design of the diesel fuel injector pump, pre-combustion chambers, customized induction valves, and other systems are often used in the injection process. These injection enhancers often aid in circulating, or swirling the air inside the cylinder for more efficient combustion. Just as with any engine fuel injection system, diesel fuel pumps are constantly being improved to be more efficient and less costly.