The controller is a digital electronic circuit which controls the total process
of pressure adjustment. It can be mounted on the dash panel to provide the vehicle operator easy access to the
The power manifold is a cluster of solenoid valves, one each for inflation, deflation
and quick exhaust for rapid pressure drop. It can be mounted inside or outside the cab because of its water tight
The interconnecting wire harness provides the communication between the controller
and the power manifold.
The wheel valves provide a controlled passage for air to go in and out of the
tires and isolate each tire at the end of the pressure adjustment cycle. The wheel valves have no electrical connections
and are operated by the available air pressure regulated by the power manifold through hoses. Tires can also be
inflated manually, independent of the CTIS. The manual inflation valves are readily accessible to the operator.
The controller panel features a two digit LED display for pressure readout. The
panel has an on/off switch and four terrain select push button membrane switches. In an overspeed condition of
the vehicle, a red LED light flashes to warn the operator.
After the ignition switch in ON, the operator can initiate the tire pressure change
at any time by pressing the appropriate button. The LED display will show the pressure set point momentarily and
then blink with the rise/fall in pressure as the operator's commands are executed The Manifold directs the air
in and out of the tires through wheel valves. The wheel valve design allows isolation of each tire to prevent simultaneous
leak down of all the tires. The modular manifold construction incorporates three solenoid operated valves, one
each for inflation and deflation; and the third for quick exhaust and shut off.
The CMASI Central Tire Inflation System is manufactured in our modern facility
in Walnut, California, USA. Every system is functionally tested (100%) in a simulated operational environment prior
to its shipment.
CTI power is interrupted if the vehicle air supply pressure falls below 90 PSI.
This allows the rest of the air pressure to be available for safe operation of the air breaks.
In this mode of operation, the air is continuously supplied to a flat tire from
the system. Also known as the limp home capability, the flat tire is continuously inflated which otherwise may
come off the wheel rim and be lost on the road.
After the flat is repaired and the CTI is turned on in normal mode of operation,
the replacement tire will fill automatically to the desired system pressure.
All LEDs in this system have a wave length of less than 640 n.m. and are undetectable
by the infrared devices. Moreover, all the LEDs on the control panel can be turned off along with all other vehicle
lighting in case of black-out mode operation.
This CTI System has a built in automatic system shut down. If the loss of air
pressure occurs due to failure, all air lines are depressurized, causing shut off of the wheel valves and the CTI
operation is terminated.
The System can be set to check or adjust the tire pressure at predetermined intervals
from 5 minutes to 95 minutes.
The axle passage seals are under pressure only when Central Tire Inflation System
is inflating, deflating or checking tire pressure, thus minimizing seal wear. Axle seals need not be continuously
pressurized because of the provision of wheel valves that shut off and isolate each tire at the end of the pressure
adjustment cycle. This permits the depressurization of seals and interconnecting lines and in turn extends seal
AN OPTIMUM SYSTEM CONFIGURATION RECOMMENDATION FOR YOUR VEHICLE
[Corporate Profile] [CTIS Overview] [CTIS Specs]
[Application Approval Form]
[CMA Site Photos]
Copy protected 2002, by CM Automotive
Systems, Inc., Walnut, CA- 91789. All rights reserved.
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