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One of the most important problems of the modern motor transportation enterprise is fast and high-quality detection of malfunctions at cars. At operation of the car there can be hidden malfunctions externally not than not proving, but, being unnoticed, they can lead to serious breakages, and, therefore, to expensive repair.

As it was already noted, it is possible to control this parameter on an exit of value of temperature of cooling liquid for certain admissible maximum and minimum values. For implementation of this control it is possible to use the sensors for measurement of temperature released by the industry, and also patented sensors and devices.

Temperature increase of cooling liquid can be caused by deterioration of liquid due to long operation without its change, at the expense of a layer of scale on internal cavities of a radiator of the cooling system which considerably reduces heat conductivity, due to malfunctions of separate knots of the cooling system (the thermostat, a pomp, etc.), and also at the expense of the lowered level of cooling liquid.

As it was noted above, at decrease in a compression first of all the volume of the karterny gases breaking through gaps in interfaces a piston ring – the piston, a piston ring – the cylinder, the valve – a valve saddle will start increasing sharply. Besides in karterny gases the volume content of oxygen will raise because toplivnovozdushny mix will burn down not completely.

Temperature increase of oil in DVS can be caused by deterioration of oil due to long operation without its change, deterioration of its cooling in a case or in the oil heater, and also due to hit in oil of mechanical impurity during the work of DVS.

In this regard control of temperature of oil in DVS is a necessary condition of reliable and safe operation of the car. At what in this case it is necessary to control only excess of temperature of some level and there is no need to take oil temperature with a bigger accuracy.

As it was already noted it is possible to control this parameter by definition of excess by temperature of oil of a certain value. For control it is possible to use sensors for measurement of temperature used in the previous paragraphs, for example:

For control of existence of a normal compression in tsilinra of DVS it is necessary to know what characteristics of work of DVS will change at decrease in a compression. First of all the volume of the karterny gases breaking through gaps in interfaces a piston ring – the piston, a piston ring – the cylinder, the valve – a valve saddle will start increasing sharply. Besides in karterny gases the volume content of oxygen will raise because toplivno air mix will not burn down completely.

From above told follows that for control of a compression in tsilinra of DVS it is necessary to check at least two parameters: amount of the karterny gases passing through system of ventilation of a case and the content of oxygen in these gases.

Researches showed that reliable, high-precision sensors are necessary for diagnosing of these or those parameters of the car first of all. Thus decision-making in various parameters have to be carried out at once on several signs characterizing on their set of a condition of this or that system in general.