Discovery 2. Manual — part 603
FRONT SUSPENSION
DESCRIPTION AND OPERATION
60-9
DESCRIPTION AND OPERATION
ACE system component layout
1 Anti-roll bar link
2 Suction hose
3 ACE/PAS reservoir
4 Return pipe
5 ACE pump
6 Pressure pipe
7 Torsion bar - front
8 Actuator hose
9 Actuator hose
10 Actuator
11 Short arm
12 Long arm
13 Anti-roll bar link
14 Isolator and bracket (2 and 4 way) 7 off
15 Pressure transducer
16 Valve block
17 Directional control valve 2 off
18 Pressure control valve
19 Long arm
20 Actuator
21 Anti-roll bar link
22 Torsion bar - rear
23 Short arm
24 ACE ECU
25 Accelerometer - lower
26 Accelerometer - upper
FRONT SUSPENSION
60-10
DESCRIPTION AND OPERATION
ACE system control diagram
1 Upper accelerometer
2 Lower accelerometer
3 Pressure transducer
4 Directional control valve
5 Directional control valve
6 Pressure control valve
7 Instrument pack warning lamp
8 Diagnostic socket
9 Reverse lamp switch
10 SLABS ECU
11 Engine Control Module (ECM)
12 Ignition feed
13 ACE relay
14 Battery supply
15 ACE ECU
M60 0589B
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FRONT SUSPENSION
DESCRIPTION AND OPERATION
60-11
Description - ACE
General
The Active Cornering Enhancement (ACE) system is used to control vehicle roll angles. The following illustrations
show the difference in body roll angle between a conventional 'passive' anti-roll bar and the ACE system.
Conventional 'passive' anti-roll bar
a Direction of travel - Right hand bend
b Body roll
c Axle roll
d Tyre squash
e Coil springs
f Body roll angle
g Axle roll angle
FRONT SUSPENSION
60-12
DESCRIPTION AND OPERATION
ACE system
a Direction of travel - Right hand bend
b Body roll
c Axle roll
d Tyre squash
e Torsion/Anti-roll bar
f Direction of torsion/anti-roll bar twist
g Coil springs
h Body roll angle
i Axle roll angle
j Reduced body roll angle with ACE system
The system is electrically and hydraulically operated with all operations controlled by an ACE ECU located behind the
glovebox in the passenger side footwell. The ACE system comprises front and rear torsion bars and actuators, two
accelerometers, ECU, hydraulic pump, valve block and a fluid reservoir.
The ACE system gives improved vehicle handling and suspension characteristics and is active for both on and off-
road driving. This is achieved by hydraulic actuators applying torque to the front and rear torsion bars in response to
lateral forces sensed by accelerometers. The ACE system prevents body roll with cornering forces of up to 0.4 g. From
0.4 g there is a progressive increase in body roll but significantly lower than a passive system. A passive system will
have a progressive increase in roll angle as soon as cornering forces are applied and will have a higher roll angle than
the ACE system for the same cornering force.
The ACE system can also detect if the vehicle is driven off-road. If off-road conditions are detected the ACE system
operation will be reduced or completely disabled at a speed of 25 mph (40 km/h) or less.
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