Ford's answers to the NHTSA 6.7 Investigation

The CP4 - concept of a cam drive unit is completely
different to the already launched Common Rail high
pressure pumps of the whole world market. Derived
from the successful distributor pump VP44, a double
cam drives a roller tappet which moves the high
pressure plungers to pressurise the fuel internally. The
whole high pressure area is located in steel heads which
also contain the high pressure element, suction and
check valves. This avoids all internal high pressure
lines, so the housing of the CP4 is designed to be made
of aluminium. The pressurised fuel leaves the pump
through two high pressure lines directly connected to
the rail.


Summarising the CP4 key issues, one leads to

• Maximum high pressure up to 1.800 bar and high
efficiency in the whole pump map, offering the
potential for a further pressure increase.

• Reduced rail pressure ripples achieved by a high
quality for the equal and synchronous delivery
allowing improved metering accuracy of the injectors

• Flexible range of applicability in modern BOSCH
Common Rail Systems with long term
standardisation of the high pressure pump interface to
the engine
The CP4 is engineered as a platform product
offering different market oriented designs. The CP4
platform maintains the optimal scaling of a specific
pump type to the required Common Rail system
functionality for different applications. For example
working with the 3
rd
generation Common Rail System
one obtains the need of high pressure and less quantity
using the Piezo – Inline injector system; vice versa in
case of Common Rail 4
th
generation due to the bigger
quantity amount of the CRI4 while driving the pressure
amplifier at moderate pressure level.