BMW 7 Series: ARS Hydraulic Valve Manifold
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Fig. 121: Identifying ARS Hydraulic Valve Manifold Components
INDEX REFERENCE CHART
- Front-axle pressure valve [PVV]
- Rear-axle pressure valve [PVH]
- Switch-position detector [SSE]
- Front-axle pressure sensor [DSV]
- Rear-axle pressure sensor [DSH]
- Failsafe valve [FS]
- Direction valve [RV]
The hydraulic valve block is located on the floor plate of the vehicle behind the front right-hand wheel housing level with the front right-hand door. The hydraulic valve block is connected to a carrier plate bolted to the body.
The hydraulic valve block houses the following valves and sensors:
- 2 pressure valves; 1 for the front suspension and 1 for the rear suspension [these are proportional pressure limiting valves]
- 1 directional control valve
- 1 failsafe valve
- 2 pressure sensors; 1 sensor for the front suspension, 1 sensor for the rear suspension
- Switch-position detector
Tandem Pump
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Fig. 122: Identifying Tandem Pump Components
INDEX REFERENCE CHART
- Radial piston pump (ARS)
- Intake restrictor valve
- Electronic volumetric flow control (EVV) valve
- Vane pump (power steering)
The hydraulic pumps fitted in this model series were based on a modular design principle. Depending on the engine and equipment specification, a suitably dimensioned hydraulic pump is flange-mounted to the engine in the same installation space.
Decisive equipment features for these tandem pumps:
- Basic steering
- Integrated Active Steering (IAL)
- CO2 reduction measures
- Dynamic Drive (ARS)
- Dynamic Drive (ARS) and Integrated Active Steering (IAL)
- Intake restrictor valve
The hydraulic pump driven by the engine's poly-V belt is, on vehicles with Dynamic Drive, invariably a tandem pump, which consists of a radial-piston pump section for ARS and a vane pump section for the power steering.
Radial-piston pump section of the tandem pump
This radial piston pump has 8 pistons in a single row and is designed for a maximum pressure of 210 bar.
When the engine is idling, the pump speed is approximately 750 RPM. At that speed, the radial piston pump section delivers a minimum fluid flow rate of approximately 5.5 l/min at a pressure of approximately 3 bar.
Consequently an adequate fluid flow rate is guaranteed even at idling speed.
At a pump speed of 1450 RPM, the maximum fluid flow rate is limited to approximately 9 l/min.
New feature
As a CO2 reduction measure when driving in a straight line, the fluid flow rate of the radial piston pump is restricted by a restrictor valve on the intake side, thereby substantially reducing the circulation pressure and, therefore, the engine power used to drive the pump. As a result, active control of the intake restrictor valve makes a positive contribution to the CO2 equation.
The Dynamic Drive and hydraulic power steering share a common fluid reservoir and fluid cooler.
READ NEXT:
Vertical Dynamics Control
General Information
When driven vigorously or on an uneven road surface, a vehicle tends to
respond with undesirable body
movements. BMW first developed Vertical Dynamics Control for the E70 and was
Vertical Dynamics Control (VDC)
Control Unit
Fig. 124: Identifying VDM
INDEX REFERENCE CHART
VDM
The location of the VDM control unit is dependent on the country in which the
vehicle is sold.
On left-hand drive vehicles the c
Electronic Ride-Height Control
Function of Air Springs
The various control modes on the F01/F02 are similar to those on other model
series such as the E70:
Fig. 131: EHC Control Mode Flowchart, F01/F02
Control Modes with Single-a
SEE MORE:
Removing And Installing/Replacing Oil Pump (N63)
Notes
IMPORTANT: All adjusting procedures on the chain drive must be observed.
A timing chain which is tensioned too tautly can cause noises in the chain
drive.
A timing chain that is too slack can cause the timing chain to jump.
Risk of damage in oil pump drive.
Necessary preliminary work
DRAI
Evasion Assistant- Warning with evasion support
Display in the instrument cluster
A warning symbol appears in the instrument
cluster and in the Head-up Display if a collision
with a detected vehicle is imminent.
Symbol /Measure
Symbol lights up red: prewarning.
Brake and increase distance.
Symbol flashes red and an
acoustic
signal sounds: acute
