RU2042849C1 - Method of transforming internal combustion engine of vehicle into air compressor - Google Patents

Abstract

FIELD: engine engineering. SUBSTANCE: air pressure is controlled in the reservoir of a vehicle in operating range between lower and upper limits by changing the number of disconnected cylinders which operate as compressors in response to a signal from the air pressure regulator in the reservoir. The operating control range is separated into intervals, the number of intervals being equal to the number of cylinders to be disconnected. When pressure is in the interval abutting on the upper limit one cylinder operates as a compressor. When the pressure is in the interval abutting on the lower limit all cylinders to be disconnected operate. EFFECT: enhanced efficiency. 6 dwg

Description

 The invention relates to systems for converting the cylinders of the internal combustion engine of a vehicle into a pneumatic compressor.

 A diesel engine is known, the fuel cut off cylinders of which are periodically transferred to the compressor mode with the subsequent supply of compressed air to the tanks.

 The disadvantages of such a conversion scheme are the presence of gas distribution valves with various types of actuators, as well as a complex ramified electric, hydraulic and mechanical actuator controls. In addition, direct and reverse conversion of the cylinders is performed discretely when lowering or increasing above a certain pressure of compressed air in the consumer tanks.

 This technical solution is taken as a prototype.

 The purpose of the invention is to increase efficiency and reduce dynamic loads on engine parts.

 The method of conversion consists in periodically turning off the fuel supply to one or more disconnected cylinders of the internal combustion engine, turning on the compressed air extraction device, and switching the disconnected cylinders in the compressor operating mode. In this case, the air in the disconnected cylinders is compressed and then fed into the tank of the vehicle. After the end of the compressor mode, the fuel supply to the cylinders to be switched off resumes and they are transferred to the internal combustion engine operation mode.

 The method of conversion is to regulate the air pressure in the tank in the operating range between the lower and upper limits by changing the number of disconnected cylinders operating in the compressor mode by the signal of the air pressure regulator in the tank. The working range of regulation is divided into intervals by the number of cylinders to be switched off, and in the interval adjacent to the upper limit, they ensure the operation of one cylinder to be switched off in compressor mode, and in the interval adjacent to the lower limit of all cylinders to be switched off.

In FIG. 1 shows the dependence of the air pumping time of the consumer reservoir in the range between the lower and upper limits of pressure regulation and the number of converted cylinders in a group of 6 cylinders; in FIG. 2 the dependence of the pumping time of the tank on the number of converted cylinders when working on the proposed method; in FIG. 3 conversion of 6 cylinders in a row in the absence of air pressure in the consumer's tank or at a pressure below the minimum control limit; in FIG. 4 conversion of 5 cylinders into a compressor when pressure P _n + Δ P is reached; in FIG. 5 conversion of 1 cylinder upon reaching a pressure P _in - Δ P; in FIG. 6 lack of compressor mode of the cylinders at a pressure of P _in .

 The method of converting ICE is as follows.

If it is necessary to supply compressed air to the vehicle’s consumer’s tank, the fuel supply is periodically shut off and the compressed air devices of the group of convertible cylinders are turned on by a signal from the pressure regulator. The working range between the upper P _in and lower P _{n the} limits of pressure regulation are divided into pressure intervals Δ P, the number n of which is equal to the number of cylinders K of the convertible group:
n is K; P = (P _in -P _n ) / K.

At the initial moment after starting the internal combustion engine and in the absence of compressed air in the vehicle’s consumer’s tank, the pressure in it is P _res = 0 (Fig. 3), the fuel supply to the group of cylinders is turned off and the pressure regulator converts all the cylinders of this group into a compressor: i = K , where i is the number of cylinders currently being converted.

This process continues until the pressure P _n + Δ P is reached. Upon entering the next pressure interval P _n + Δ P, one cylinder of the convertible group is switched off (Fig. 4). In this case, the cylinder can be in two modes: it continues to work without fuel supply, for example, in idle mode and light loads, and in load mode when the fuel supply is turned on.

With a further increase in pressure and entering the next pressure interval, one more cylinder is turned off and so on until the pressure P _res = P _{c is} reached. At this moment (Fig. 6), the last cylinder of the group is turned off and the supply of compressed air to the consumer's tank is stopped.

Conversely, with a decrease in pressure P _rez below P _in and entering the first interval adjacent to the upper limit of the air pressure regulation range, one cylinder P _rez = P _in - Δ R. is converted. Subsequently, the process is the opposite and similar to that considered.

 In the general case, the pressure regulator converts each cylinder separately to the compressor or back to the engine, depending on the required rate of supply of compressed air to the consumer's tank.

The number of converted cylinders i depends on the pressure P _rez at a given time and is determined by the formula
i = (P _in -P _rez ) / P (Fig. 1 and 2).

 The number of cylinders obtained by this formula is rounded up.

 The advantage of this method of converting the internal combustion engine of a vehicle into a pneumatic compressor is the continuity of air supply to the consumer’s reservoir, depending on the pressure in it determined by the pressure interval Δ P. At the same time, diesel fuel consumption and the level of dynamic loads on the internal combustion engine components at the time of cylinder conversion are reduced.

Claims (1)

 METHOD FOR CONVERTING THE INTERNAL COMBUSTION ENGINE OF THE VEHICLE IN A PNEUMATIC COMPRESSOR, which consists in periodically shutting off the fuel supply to one or more disconnected engine cylinders, turning on the compressed air extraction device and putting the disconnected cylinders into the compressor's operating mode, air compression vehicle reservoir, renewing fuel supply to switchable cylinders and putting them into internal engine operation combustion, characterized in that the regulation of the air pressure in the tank in the operating range between the lower and upper limits is carried out by changing the number of disabled cylinders operating in the compressor mode, according to the signal of the air pressure regulator in the tank, the operating range is divided into intervals by the number of disabled cylinders, moreover, in the interval adjacent to the upper limit, ensure the operation of one switchable cylinder in compressor mode, and in the interval adjacent to the lower limit, all are switched off x cylinders.

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