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CTIS Summary

 Basic Components


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 control switches.


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 construction..

Wire Harness

The interconnecting wire harness provides the communication between the controller and the power manifold.

Wheel Valves

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.

System Operation

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.

System Features

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.

Aire Brake Priority

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.

Run Flat Mode

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.

Black Out Mode

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.

Fail Safe 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.

Air Pressure Check

The System can be set to check or adjust the tire pressure at predetermined intervals from 5 minutes to 95 minutes.

Extended Seal Life

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 life.


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