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The problem of fuel consumption decrease in agricultural machinery may be addressed in several ways. One is to equip mobile agricultural machines (tractors, harvesters, sprayers, fertilizer spreaders, etc.) with on-board computers (BC) capable to measure the fuel flow rate, in particular, which will allow to decrease fuel consumption by these machines due to timely control of the technical conditions of the engine and optimization of the machine operation modes from the point of view of fuel consumption. The article describes a family of diaphragm chamber fuel flow transducers (FFT) for on-board computers of mobile agricultural machines, gives their technical characteristics and laboratory and field test results, and recommendations on connecting them to engines of various power specifications.

The main requirements to which the brake system of a vehicle should respond are provision of the standard operation speed and protection features of the control pneumatic drive in case of a malfunction of any of its elements. The article describes a design of modified pneumatic brake drive having improved protection properties in case of damage of a diaphragm of any brake chambers, and methodology of parameter optimization of such drive allowing to create a layout of drive assemblies with the necessary operation speed for MAZ truck-based road trains.

Speed measurement accuracy of computers installed on wheeled tractors, not equipped with radar velocity transducers depends on the following: the rolling radius of the wheel to which the speed sensor is connected; the number of sensor's pulses per revolution; and algorithms used for processing the data that arrives from the speed sensor. The work deals with the effect of static tire characteristics and other factors influencing the speed measurement accuracy of wheeled tractors by means of on-board computers. Recommendations are given aimed at accuracy improvement when measuring tractor speed.

A perspective design technique of on-board computers for mobile agricultural machines is their creation on the basis of standard modules allowing to reduce the designing period, to improve reliability, quality, and also to make operation and modernization of designed systems cheaper. Because modules are made in different standards, there is a problem of choice of modules for a concrete application. The paper considers various problems of application of a PCI bus in on-board computers of mobile agricultural machines. Recommendations on efficient use of the PCI bus are given.

One of major requirements produced to fuel flow transducers installed on mobile agricultural machines with diesel engines is minimum resistance to fuel flow passing through them in order not to exert any influence on operation of the engine. The paper gives a mathematical model of a diaphragm chamber fuel flow transducer, description thereof may be found in SAE paper No. 982048 [1]. Optimization results of the mathematical model of the transducer's design parameters are given.