The development of modern diesel engines is now determined by the limits of toxic exhaust.
The injector is a critical part of the modern injection system. There are two types of injectors: electromagnetic injectors, which allow for injection of 5 parts fuel and piezoelectric injectors, in which the dose can split up to 7 parts. Solenoid-controlled injectors have non-return valves and springs, which causes inertia in its operation. Piezoelectric injectors can be in versions without any springs and non-return valves. Reducing the number and weight of moving parts (up to 75%) reduces the inertia of the injector and allows for greater accuracy and speed of fuel delivery.
The injector opening characteristics are formed so that the maximum stroke is reached in about 200 milliseconds. As a rule, switching times can be shorter and not limited to 200 milliseconds by piezo ceramic dynamics. However, in this case, more power is required in the actuator electronics without noticeable improvement in the combustion process. Closing time from maximum stroke is also about 200 milliseconds. A partial stroke can also be achieved when needed.
Fuel injection diagram in cylinder
Thanks to such electronic regulation it is possible to vary the start, duration and flow of injection, and thus the amount of fuel injected. This gives great precision in terms of both injection flow and reproducibility in all successive duty cycles. For variable engine modes, a very short reaction time that is four times shorter than with an electromagnetic injector is important. This provides the optimum injection flow for all operating modes and loads in terms of engine efficiency and exhaust composition.
Each syringe is precisely calibrated
Peso injection molding techniques are used to achieve speed and precision. Experience so far has shown that a piezo injector can reduce exhaust emissions by up to 20 percent or increase power by 5 to 7 percent. Bosses engineers say the life of the injectors is between 150 and 250 thousand kilometers, when their performance is significantly poor. When changing, it is advisable to change all the injectors.
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