The Jaguar XE adopts the latest ZF electric power steering technology. Unlike a
conventional hydraulic or electro-hydraulic steering system, the power assistance is
delivered by an electric motor and not pressurised oil. A torque sensor built into the
steering gear is used to measure the steering effort of the driver and calculate the
assistance needed.
In a standard power steering system, the hydraulic pump has to be driven continuously
to maintain system pressure and allow the system to function. An electric power stering
system doesn’t have this problem, the motor only operates to provide assistance when
required. This results in significantly less energy wasted and less fuel consumed, reducing
overall vehicle CO2 emissions by 3% on petrol engine vehicles and 2% diesel engine
vehicles.
The Power Steering Control Module (PSCM) adapts steering feel according to the setting
of JaguarDrive Control (JDC). In Dynamic Mode, the steering map adjusts to give a sportier
feel; in Winter Mode, on slippery surfaces, it will adapt to give more feel. The level of
steering assist varies to provide more assistance when manoeuvring at low speed, and
more steering feel at high speed.
Electric power steering enables the implementation of Lane Departure Warning (LDW)
and Park Assist functions. A pull/drift (camber) compensation feature helps avoid constant
steering corrections, by reducing the effect of road camber variations. Soft lock stops
provide a cushioned feeling to the driver, avoiding an abrupt feeling as the steering meets
the lock stops. Active return improves the self-centring function of the steering. A parking
torque control function provides consistently light and effortless steering when parking
the vehicle.
Jaguar