Sensors

AUTOMOTIVE ELECTRONICS DIVISION

BRISK Tábor has been engaged in the development and production of sensors for vehicle aggregates since 1984.

The automotive electronics division is a compact unit, which has a wholly new, modern and unencumbered development and production base.

State-of-the-art procedures are used in the development and manufacture of sensors; project management in direct co-operation with the customer is used.

The entire development and production process is managed according to the strict rules of the ISO/TS 16 949 system and customers‘ specific requirements.

Each product is, in the course of development, subjected to rigorous tests to validate its functionality and reliability.

The automotive electronics division has an excellently equipped laboratory and testing centre.

SENSOR TYPES

1. SPEED SENSING

Using these sensors, it is possible to sense speed and angle of rotary components and position of sliding parts and equipment.

They operate on the principle of measurement of change of the magnetic field.

During the sensing process, a change occurs in the voltage or resistance of the target element and the measured parameter is related to it.

In the sensing of speed and detection of position, inductive, Hall and magnetoresistive sensors are used.

• NDUCTIVE SENSORRS

A. INDUCTIVE SENSORS

Inductive sensors are used for speed sensing and are based on the principle of electric voltage induction in the coil caused by magnetic field change.

These sensors are used for speed and position sensing of the ferromagnetic target wheel or of a mark from magnetically soft material.

The measurement variable of the inductive sensors is output voltage, which is further processed in the control unit.

Inductive sensors are considered as one of the most reliable options and are suitable for a broad range of applications, e.g. pulse sensors.

• HALL SENSORS

B. HALL SENSORS

These sensors are used for speed and position sensing of the ferromagnetic target wheel or of a mark from magnetically soft material on the Hall effect principle.

The basic function of speed sensors is to generate a change in the output signal upon passage of a tooth of the code wheel through the functional axis of the sensor.

This principle ensures quality function in all, including extreme conditions, and makes it possible to achieve the desired shape and accuracy of the output signal.

SENSOR PRINCIPLE

• MAGNETORESISTIVE SENSORS

MAGNETORESISTIVE SENSORS

It is a new trend in sensors utilizing the principle of the magnetoresistance – dependence of electrical resistance of some materials on the magnetic field strength.

When using magnetoresistive chip, a change in the magnetic field results in a change in the resistance on the chip output.

They are used for sensing the position, speed, and for contactless measurement of current.

At present, co-operation on their development is ongoing between the Faculty of Electrical Engineering of Czech Technical University in Prague and the chip manufacturers themselves.

2. POSITION SENSING

Using these sensors, it is possible to measure the distance or displacement (change of position) or simply detect the presence/absence of a specific object (contactless switch).

In the selection of the correct functional principle, it depends mainly on the material of the detected object, switching distance and electric connection.

Position sensors are most commonly used for sensing the movement of the accelerator pedal or the detection of the angle of the throttle.

3. DETECTION LEVEL

This group of sensors can work in connection with several types of monitored substances.

Level switches operate on a principle of measurement of dielectric’s capacitance change. This dielectric is created between the electrode of the switch and vessel with fluid in the case of conductive liquids. In the case of non-conductive liquids the dielectric is created with help of another auxiliary electrode.

The output signal is either switched (level sensor) or linear (detection of level height).

4. TEMPERATURE SENSING

The temperature sensors measure the change in thermistor resistance (element whose resistance varies with temperature).

The output is change of resistance depending on the temperature.

We are able to offer NTC and PTC versions.

We can comply with any characteristic of the sensor, which is based on dependence of resistance on temperature.