With 435 hp and 900 Nm of
torque, the new Audi SQ7 TDI is the most powerful diesel SUV on the market. It
also leads the competition in numerous other technical fields. Its newly
developed 4.0 TDI engine features a world first: An electric powered compressor
gives the SQ7 TDI outstanding off-the-line performance. Yet it consumes on
average 7.4 litres of fuel per 100 kilometres.
“Following the launch of the
successful SQ5, we are now also applying the concept of a diesel- engined S
model to the Q7 model line. So equipped, the SQ7 TDI with a V8 TDI engine
achieves the consumption figures of a six-cylinder. The new technology solution
of the electric powered compressor in the SQ7 TDI is a world first in the
competitive environment, with which Audi once again underscores its claim
Vorsprung durch Technik,” said Dr. Stefan Knirsch, Member of the Board of Management of Audi AG
for Technical Development.
The 4.0 TDI has been newly
developed from the ground up. It
combines best-in-class performance with low consumption and guarantees maximum
dynamics. The V8 engine has a displacement of 3,956 cc. The two exhaust-gas
turbochargers are activated selectively according to the concept of sequential
charging, since exhaust gas only flows through one turbocharger at low and
intermediate load. The second turbine is
only activated at higher loads. An electric powered compressor (EPC) augments
the work of the two turbochargers, particularly in the lower engine speed
range, providing for extremely dynamic off-the-line performance.
With 435 hp and 900 Nm of torque between 1000 and 3250 rpm, the SUV sets new
benchmarks in the segment. It accelerates from 0 to 100 kmph in 4.8
seconds; top speed is 250 kmph (governed).
Forced induction concept and electrical system: Electric powered
compressor (EPC) and 48-volt subsystem
The electric powered
compressor is a world first in a production vehicle. This EPC strongly supports
the 4.0 TDI engine when starting off and accelerating from low load for pure
dynamics with no turbo lag. It is placed in the air path downstream of the
intercooler, close to the engine. Because the EPC does not require any
exhaust-gas energy to develop boost, it can be used at any time, thus making it
the solution for the traditional weaknesses of the classic exhaust-gas
turbocharger. With this technology, turbo lag is history. The EPC provides the
engine the boost energy needed for the dynamic delivery of power in less than
250 milliseconds. Driven by a compact electric motor, its compressor wheel
spins up to 70,000 revolutions per minute. The 4.0 TDI thus develops its
immense power with no perceptible lag: It is available immediately upon
depressing the accelerator. That is a major plus, particularly when starting
The Audi valvelift system
(AVS) is also making its debut in a diesel model from Audi. The inlet and
exhaust cam shafts each have two cam contours per valve. On the
inlet side, one
cam contour supports
starting off in conjunction with
the EPC, while the other optimizes cylinder filling and thus power at high
engine speeds. The AVS system on the exhaust side enables activation of the
second exhaust-gas turbocharger. The
sequential charging system controls the
turbochargers so that only
one turbocharger is used
at low engine speeds. The second is activated additionally at
higher loads and engine speeds. The customer benefits from very good torque
delivery and dynamic response across the entire engine speed range.
The exhaust streams from the
two exhaust valves are hermetically separated, with each driving one of the two
turbochargers. In the lower engine speed range, one valve per cylinder remains
closed, so that the full exhaust stream flows to the active turbocharger. When load and engine speed increase, the AVS opens
the second exhaust valves. This
directs flow to and activates the second exhaust-gas turbocharger. The engine
achieves its maximum output in this biturbo mode. The switching by the AVS enables fast and
precise activation of the second exhaust-gas turbine.
Source: Audi AG
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