BS ISO 7876-5:2021 pdf download – Fuel injection equipment — Vocabulary Part 5: Common rail fuel injection system
This document establishes a vocabulary for common rail (CR) fuel injection systems for diesel (compression‑ignition) engines and their components. The terms defined in this document are unique to common rail fuel injection systems, terms and definitions relating to other fuel injection systems are found in the other parts of the ISO 7876 series.
2 Normative references
There are no normative references in this document.
3? Terms? and? definitions
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
common rail fuel injection system
common rail injection system
CR fuel injection system
common rail system
high‑pressure fuel injection system, comprised of the high pressure supply pump (3.3), the rail (3.9) or the distribution block (3.10), and the CR injectors (3.5).
Note 1 to entry: It is also characterized by the following features:
— the fuel pressure of a rail (3.9) or a distribution block (3.10) may be varied independently from engine speed and load and is electronically controlled;
— the start and the end of the injections are controlled by an electrical valve at the CR injector (3.5);
— the energy for the injections is supplied to the CR injectors (3.5) from a rail (3.9) or a distribution block (3.10) with highly pressurized fuel;
— The injected fuel is supplied from a rail (3.9) or a distribution block (3.10).
fuel feed pump
low‑pressure pump delivering fuel from the tank via one or several filters to the high‑pressure generating components
high‑pressure storage chamber with the function of supplying the CR injector (3.5) with fuel, and it doesn’t have a long shape
device located between the rail (3.9) or the distribution block (3.10), and each CR injector (3.5) designed to shut off the fuel flow in the pipe if the maximum permitted flow is exceeded
device located between the rail (3.9) or the distribution block (3.10), and each CR injector (3.5) designed to moderate the fuel pressure pulsation in the pipe caused by each injection
Note 1 to entry: This damper may also act as a flow limiter (3.11).
CR pressure sensor
sensor designed to measure the pressure within the rail (3.9) or the distribution block (3.10), providing an electrical signal to the electronic control unit (3.15)
Note 1 to entry: The word “CR” can be omitted providing there can be no misunderstanding.
pressure limiting valve
safety valve designed to limit the operating pressure to the maximum permitted pressure
electronic control unit
device that controls the high-pressure supply pump (3.3), the CR injectors (3.5) and other valves, e.g.
the pressure control valve (3.6), depending on the speed and load of the engine and on other operating conditions (air temperature, coolant temperature, boost pressure, etc.)
fuel injection performed multiple times during a single engine combustion cycle in a controlled state
parts of the multiple injection (3.16) that contribute most to the combustion generating a force to depress the piston
small amount of fuel injection that takes place in a controlled manner before the main injection (3.17),with a clear non‑injection period between the pre‑injection and the main injection
fuel injection that takes place in a controlled manner again after the main injection (3.17), with a clear non‑injection period between the main injection and the post injection.BS ISO 7876-5 pdf download.