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When creating a sensor, you should select its type in accordance with the principle of its operation and the equipment used.

The types of sensors provided in the WemoFleet system are divided into six groups:

  • mileage,
  • digital,
  • gauges,
  • engine,
  • fuel,
  • other.

The sensors from each group are described below.


Mileage

This group includes sensors which are used to determine the travelled distance. 

The name of the sensor

Metrics

Description

Mileage sensor

kilometers (km)

miles (mi)

The sensor shows the distance travelled by the unit. You can use it in the trip detector to detect trips and parkings.

Relative odometer

kilometers (km)

miles (mi)

The sensor which shows the distance travelled by the unit since the last message was received from it. You can use it in the trip detector to detect trips and parkings. 

Digital

This group consists of sensors which can have only two states. For example, on/off, activated/deactivated, and so on. 


The name of the sensor

Metrics

Description

Engine ignition sensor

On/Off or any

The sensor which shows whether the ignition is on or off. You can use it in the trip detector to detect trips and parkings and in mileage and engine hours counters. In addition, you can use the engine ignition sensor to detect fuel thefts at idle. To do this, you should specify the fuel consumption rate at idle in the Consumption, liters per hour field. 

Alarm trigger


The sensor a non-zero value of which allows marking a message as an alarm one (SOS). The messages registered in the system before the creation of the sensor are not marked as alarm ones. 

Private mode

On/Off or any

This sensor is used to determine the trip type (BusinessPrivate).

Real-time motion sensor

On/Off

The sensor which determines the movement state of units in real time. The movement state determined by the sensor is shown on the map and in the work area on the Monitoring tab. To do this, the Replace unit icons with motion state signs option should be enabled in the user settings as well as the Motion state option on the Monitoring tab. The sensor readings can be based on the values of speed, ignition, engine revolutions, etc. As for other sensor types, you can specify an expression parameter and configure validation. 

Custom digital sensor

On/Off or any

This sensor can register two states (on/off, activated/deactivated, etc.).

Gauges

This group contains sensors which are used to measure such values as voltage, weight, acceleration, temperature.

The name of the sensor

Metrics

Description

Voltage sensor

volts
(V)

The sensor which shows the voltage value. For example, this value can be used to determine temperature or the ignition state. 

Weight sensor

tons (t)

pounds (lb)

This sensor is used to detect the weight of transported cargo.

Accelerometer

g

The sensor which is used to determine acceleration along the X, Y, Z axes, which allows detecting a collision, that is, a road traffic accident. 

Temperature sensor

Celsius degrees

(°C)

Fahrenheit degrees

(°F)

The sensor which shows the temperature value or any other parameter. You can use the temperature sensor to analyze received values. See a configuration example.

Temperature coefficient


The coefficient which is used to calculate the fuel level at different temperatures in the tank more precisely. See a configuration example 

Engine

This group includes sensors which are used to measure values associated with the engine operation. 


The name of the sensor 

Metrics

Description

Engine revs sensor

rounds per minute (rpm)

The sensor which shows the frequency of engine revolutions. 

Engine efficiency sensor

any

The sensor which is used to determine the movement coefficient under load, which is used to calculate the fuel consumption. The sensor can function as a reduction coefficient if its values are from 0 to 1. You can specify any unit of measurement for this sensor. 

Absolute engine hours

hours

The sensor which shows the total number of engine hours. 

Relative engine hours

hours

The sensor which shows the number of engine hours, taking into account the work intensity coefficient. See a configuration example.

Fuel

This group consists of sensors which can be used to determine the amount of consumed fuel and the fuel level in the tank. 

The name of the sensor

Metrics

Description

Impulse fuel consumption sensor

liters (l)

gallons (gal)

The sensor shows the accumulated value of impulses. To convert the incoming value into the amount of consumed fuel, the calculation table should be applied. For such sensor type, the calculation table is applied to the difference between two adjacent messages. After sensor creation and adjustment, it is necessary to enable the Calculate fuel consumption by sensor option. Note that if a device sends not an accumulated value of impulses, but the number of impulses between the messages, it is necessary to use instant fuel consumption sensor. 

Absolute fuel consumption sensor

liters (l)

gallons (gal)

The sensor detects fuel consumption over all period of vehicle operation. After sensor creation and adjustment, it is necessary to enable the Calculate fuel consumption by sensor option.

Instant fuel consumption sensor

liters (l)

gallons (gal)

The sensor shows fuel consumed from the previous measure (message). After the sensor creation and adjustment, it is necessary to enable the Calculate fuel consumption by sensor option.

Fuel level sensor

liters (l)

gallons (gal)

The sensor which determines the fuel level in the tank. In the sensor properties, you should enable the Calculate fuel consumption by sensor option. See a configuration example.

Fuel level impulse sensor

liters (l)

gallons (gal)

The sensor which is designed to calculate the amount of fuel in the tank. When calculating the amount, the difference in the values of the impulses from two messages in a row is divided by the time difference between them. 

Other

The name of the sensor

Metrics

Description

Counter sensor

any

The sensor which allows determining the intensity of passenger traffic or the number of certain actions (for example, opening and closing the door). There are several types of such sensors:

  • instant (shows the difference of values between two messages in a row);
  • differential (shows the total number);
  • differential with overflow (2 bytes);
  • switch from ON to OFF (counts the number of deactivations);
  • switch from OFF to ON (counts the number of activations).

You can specify any unit of measurement for this counter.

Custom sensor

any

The sensor which can be configured to measure any value. You can specify any unit of measurement for this sensor. 

Driver assignment


The sensor which can be used to detect the assignment of the driver to the unit. 

Trailer assignment


The sensor which can be used to detect the assignment of the trailer to the unit. 

Passengers sensor


The sensor which can be used to detect when passengers are picked up or set down. 


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