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Address

Park Court. 01 Ojijo RD

Nairobi, Kenya

Working Hours

Mon - Sat: 7am - 6pm

sunday: Urgent Appointment

Tire Pressure monitoring System

TPMS Sensors

The Tire Pressure Monitoring System measures and gives feedback of tire pressure of a vehicle. A MIL (Malfunction Indicator Light) will go off on the dashboard instrument panel if one or more tires on a vehicle contains an undesirable amount of air pressure which could lead to unsafe driving conditions. Tire pressure affects steering precision as well as braking of vehicles, one of the two most safety impacting driving parameters. Tire pressure calibration and monitoring is therefore an indispensable responsibility that every driver should take on. Thanks to modern technology, constant monitoring and fault detection can be managed by use of TPMS Sensors in conjunction with the onboard vehicle computer.

Tire air pressure has a direct relation to fuel economy as well. Under-inflated tires result in poor fuel economy as some acceleration power will be dumped to the increased frictional forces between the road and the large surface area it is in contact with. There are two main types of TPMS based on the method used to acquire the information of the tire air pressure.

a picture of a rotating car wheel

Wheel Speed Cotrolled

Indirect TPMS

The Indirect TPMS works in conjunction with the vehicle’s Anti-lock Braking System (ABS) which utilizes wheel speed sensors. The Indirect TPMS calculates the individual tire air pressure based on wheel speeds on even surfaces and while the vehicle maintains uniform linear motion. An under-inflated tire has a smaller diameter and hence a smaller circumference resulting in faster rotation than a correctly pressurized tire. The reverse is true (an overly inflated tire will take longer to complete one full rotation and hence will rotate slower).

Keep in mind that pressure changes in the tire will be affected by weather conditions as well as the thermal differences between the tires and the surface that they are in contact with.

MEMS SENSOR CONROLLED

Direct TPMS

The Direct TPMS utilizes the use of Microelectromechanical Systems (MEMS) modules mounted in each wheel to measure the tire pressure. The MEMS sensor modules are discrete stand-alone systems that can be installed and uninstalled in the wheels. They collect the pressure data individually from each wheel and send it wirelessly to a central controller module that convert the data into useful human readable information either via a display provided with the system or directly to a smartphone app depending on the type, model and make of the system.

Some modules collect other data from the wheel as well such as tire temperature. The tire location on the vehicle is programmed during installation and calibration using the distinct serial numbers contain in each Direct TMPS module. The serial numbers also aid the vehicle computer to recognize and distinguish the data from the Direct TPMS from other data from other systems in the car. The Direct TPMS can be used in conjunction with the Indirect TPMS which might be the default TPMS system that most vehicles are shipped with from the factory.

Address

Park Court. 01 Ojijo RD

Nairobi, Kenya

Working Hours

Mon - Sat: 7am - 6pm

sunday: Urgent Appointment

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