On systems of GPS-monitoring of transport has already been written a lot. Recall that there are four varieties: – autonomous systems operating in real time (online) – autonomous systems operating in offline mode – system with the subscription fee (software and maps are on the client) – a system with the subscription fee (software and maps are at the operator, the so-called WEB-based interface). It is also possible combination options building monitoring systems. All these systems allow the addition of motion control parameters and various sensors, in particular the fuel sensor. Since the theme of economy is now is very serious (and not only in connection with crisis), we dwell on the control of fuel in some detail. The fuel in the GPS-monitoring can be controlled by several methods, which vary in accuracy, price, and that the client receives in the long run. Calculated method. This is the easiest and cheapest method, not requiring any intervention in the fuel system, but at the same time the most inaccurate.
Enough to enter into a computer program standard fuel consumption for a particular vehicle equipped with GPS-controller. The program multiplies the standard rate for mileage according to the satellite system and the result is a fuel consumption over a period of time. Despite the primitive method it is still essentially the exact same calculation carried out on the basis of mileage from the odometer, which can be easily faked. Also note that the data on fuel consumption would be considered not by themselves, and in complex with real mileage car, displayed on the map. That is, the manager will see that all flights are made according to task, at a designated route followed by a machine, whether there had been "left" flights. It should be noted that calculation method does not allow to see the place and time of dressings or drains. Fuel level sensor.
A more accurate method is to connect to onboard GPS-controller, the fuel level sensor. Here are possible options that differ in accuracy and cost. Cheapest way to connect to the standard gauge cars. At the same time as there is no interference with the fuel system. However, the error in this case is large enough (though less than the estimated method): for domestic cars with mechanical float sensors up to 20% for foreign cars 5 10%. Wear sensor at the same time is also relevant. Thus, the connection of the regular fuel sender to GPS-enable the controller to a certain accuracy to monitor fuel consumption and see the actual (time and place), dressings, or drains, if any. Much more accurate is the installation of fuel tank precision electronic level sensor. The most common types, it is capacitive and ultrasonic sensors. They have no moving parts, no wear. Accuracy of these sensors is about the same and amounts to 1-2%, zapravlenoslito. Sensor fuel consumption. There is a group of vehicles, which are characterized by relatively high fuel consumption, while a small movement on the terrain, for example – excavators, bulldozers, loaders. Another group of vehicles has a rate of almost (or completely) independent of speed, for example – additional engine mixer mixer or a refrigerator. In such cases, the fuel control You can use the flow sensor. In contrast to the level sensor, which is installed directly into the tank, these sensors are installed in the rupture fuel system and show no fuel level, and how much fuel is "ate" engine.