Haldex’s EMS system is a total vehicle management system
designed to manage vehicle energy and transform it simultane-
ously to any function within a vehicle.
inertia energy to fluid energy (available torque) during
braking and implement cycles and simultaneously uses it
for other functions or stores it within a central accumulator.
The vehicle hydraulic circuits are mechanically coupled, but
operate completely independently. The open-loop hydrau-
lics and closed-loop electronics allow precise conversion of
energy, without waste, Haldex said.
In the year since the debut at Bauma, Pizzo said
Haldex has completed its own lab testing in Rockford and
has been able to determine — based on a very specific
roundtrip on-road duty cycle — that fuel savings could be
greater than 45%.
One of the primary advantages Haldex has seen for
EMS is lower fuel consumption. While it places qualifiers all
over the place, as performance is dependent on individual
vehicle duty cycles, fuel savings approaching as much as
50% was seen as possible.
Now, with its own testing and outside modeling, that
number is coming into clearer focus.
Second, modeling done by a major off-highway equip-
ment manufacturer projected fuel savings of more than
35%, based on the specific duty cycle of the single type of
machine it was tested on, Pizzo said.
Further, another major OEM is conducting ongoing
modeling of the EMS system with various-sized rotating
groups. These rotating groups are capable of handling
machines from zero to 100 hp and the larger size up to
500 hp. The technology lends itself to scaleability from
smaller pieces of equipment up to some of the largest
pieces of mobile equipment in the market.
Pizzo said Haldex has also reviewed additional ways to
package the EMS for other types of on-highway, material
handling and off-highway vehicle platforms. dp
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MOBILE HYDRAULICS
Haldex Variable Flow
Oil and Water Engine
Pumps
aldex Concentric will exhibit a pair variable flow
pumps at IFPE 2011, an oil and water pump,
The Haldex Concentric variable flow oil pump (VFP) is
an annulus and rotor design that provides infinitely variable
lubrication for the new generation of engines, reducing fuel
consumption by as much as 4%, the company said.
The VFP design uses two rotor sets to align flow to
demand, reducing power requirement and fuel consumption.
The driving rotor operates in the normal manner while the
position and flow of the second, eccentric rotor is controlled
either mechanically or electronically.
Haldex said both European and U.S. OEMs are working
with Haldex Concentric on variable flow pumps for both
diesel and petrol engines, off-highway, truck and passen-
ger car applications.
Combined with a variable flow water pump, the pumps can
reduce parasitic losses from diesel engines by as much as
5%, depending on the vehicle’s drive cycle.
Also being exhibited at IFPE is the Haldex Concentric vari-
able flow coolant pump, intended primarily for medium- and
heavy-duty commercial vehicles, which like the oil pump,
allows infinite control according to demand. The variable
flow coolant pump increases the rate of engine warmup to
optimum operating temperatures, further improving fuel effi-
ciency, Haldex said, as much as 2% or 5% when combined
with a Haldex Concentric variable oil pump.
Haldex said that by speeding engine warmup and maintain-
ing optimum operating temperatures, a variable coolant pump
can significantly reduce diesel particulate and nitrogen oxide
as well as carbon monoxide and hydrocarbons emissions.
The company also said variable flow pumps reduce hydraulic
and mechanical noise, enhancing the engine NVH profile. dp
A pair of variable flow pumps,
an oil and water pump, are being
shown by Haldex Hydraulics
at IFPE. Both pumps are
designed to help diesel
engine manufacturers
reduce fuel consumption
and exhaust emissions.
