Central Tire Inflation System. - Mercedes-Benz

Central Tire Infl ation System.
Mercedes-Benz Military Vehicles.

Central Tire Infl ation System (CTIS) for Off-Road Vehicles.
To improve traction on soft and sandy surfaces, for example, Mercedes-Benz has developed a tire
pressure control system for single-tire, all-wheel-drive vehicles to enhance the outstanding, inherent
off-road characteristics of such trucks.
Reducing the air pressure in the tyres increases the tire
contact area (footprint) and lowers the specifi c ground
pressure. Depending on the ground conditions and tire air
pressure, twice as much traction can be achieved.
Mercedes-Benz all-wheel-drive vehicles fi tted with a tire
infl ation system can traverse even the toughest of terrains –
whether muddy fi elds, desert sand dunes, climbing
grass-covered embankments or fording rivers. The vehicle
tackles obstacles like these easily and safely.
50
40
30
20
10
Traction force in kN
1.5 2 2.5 3.5
Tire pressure in bar
3 bar
2 bar
1 bar
3.2 t 4.7 t 6.3 t
The tire infl ation system not only increases vehicle mobility
and reliability when moving, it also helps to ensure that
a need for vehicle recoveries is avoided as far as possible.
It also prevents unnecessary damage to fi elds. Moreover,
simple adjustments to correct the air pressure ultimately
reduce tire wear.
The Central Tire Infl ation System (CTIS) enables drivers
to adjust the tire pressure while driving to match the
relevant ground conditions. The tires on the front and rear
axles can be regulated together or separately. This option
is not available for the Semi Tire Infl ation System (STIS).
The driver can quickly reduce the air pressure from 7 to
2 bar, for example, and can then increase it again almost
just as quickly. Depending on the version in question, the
pressure of each tire can be monitored via pressure gauges.
The tire infl ation system is also guaranteed to function
reliably across an extreme temperature range: -40°C to
+80°C. Mercedes-Benz vehicles off er various types of tire
pressure control systems.
Central Tire Infl ation System 3

4
Semi Tire Infl ation System (STIS). This system only
allows the tire pressure to be adjusted when the vehicle
is at a standstill. The driver pre-selects the required tire
pressure on a control panel, and then - after the connecting
hoses have been fi tted – adjusts the tire pressure as
required.
Central Tire Infl ation System (CTIS). The control system
switches are mounted within easy reach on the dashboard.
Pressure gauges display the tire pressures separately
for front and rear axles during the infl ation or
defl ation process to enable the driver to adjust the tire
pressure accurately for diff erent load and operating conditions.
The driver can set maximum air pressure levels.
A safety device ensures that these limits are not exceeded.

The driver can continue the journey, even if there is minor
tire damage, because the system can provide a continuous
supply of air. If the tire damage is more severe, however,
the driver can close the blocking valves on the serviceable
tyres. The entire air volume is then sent to the damaged
tire. If the control system malfunctions, the tyres can be
manually supplied by means of additional tire infl ation
valves. The pressure relief system is switched off when
moving, and the tire pressure level is no longer displayed.
Automatic Central Tire Infl ation System (CTIS). This system
allows tire pressures to be set at specifi c values in the
control unit. The driver can then select them to suit the
prevailing ground conditions.
The tire pressure control system is mounted above the
windshield and can be used to pre-select tire pressures for
driving on solid surfaces (roads), on slightly soft surfaces
(off -road) or on particularly soft surfaces (sand and mud).
In emergencies, a special switch can be used to pre-select
a much lower tire pressure to enable a bogged down vehicle
with poor traction to free itself.
A monitoring circuit checks the tire pressure at regular
intervals, with minor air losses automatically rectifi ed. If
the vehicle speed is incompatible with the pre-selected
tire pressure and the driver fails to observe the warning
messages, the pressure is automatically increased. The
system is unpressurised when moving and needs to be
activated when the ground conditions require this.
Central Tire Infl ation System in the Unimog (tirecontrol).
This system constantly shows the front and rear axle tire
pressure levels on the instrument cluster’s LCD display.
Switches also enable the driver to operate the system
while moving. This means that various load and operating
states can be individually accommodated. Pressure losses
in a tire can be compensated during a journey by pumping
in air.
Central Tire Infl ation System 5

Mercedes-Benz has a lot more to offer.
• World’s Leading Truck Manufacturer
• Full Line Military Program (0.5 to > 100.0 t military payload)
• Advanced Vehicle Technologies (focusing on life cycle costs)
• Logistic Support Analysis (LSA)
• Integrated Logistic Support (ILS)
• Logistics Field Service Proven Worldwide
• Established Supplier to Armed Forces Worldwide
• Financially Strong & Reliable Partner
• Financial Services (financing, leasing, fleet management and a great deal more)
For further information please contact your
Mercedes-Benz representative or:
Daimler AG
Special Trucks Division
Mercedes-Benz Military Vehicles
76742 Wörth, Germany
www.mercedes-benz.com/military-vehicles
Central Tire Infl ation System 7

We reserve the right to make modifications to the design and equipment. The data contained in this brochure should be regarded as approximate.
This brochure shows an excerpt of the Mercedes-Benz vehicle range, other specifications according to customer requirements are possible.
Please note that some models and services may not be available in certain countries due to local legislation.
Daimler AG · Special Trucks Division · 76742 Wörth, Germany · 6703.9115.02-00/0508 · Printed in Federal Republic of Germany · Imprimé en République fédérale d’Allemagne.