RU2176742C1 - Tank engine unit pickup increasing device - Google Patents

Abstract

FIELD: mechanical engineering; power unit control devices. SUBSTANCE: device has turbopiston diesel engine with air starting system provided with air bottles pneumatically coupled with step-down pressure regulator. Electropneumatic valve is installed in air system. At maximum fuel delivery microswitch found under pedal closes electric circuit. At this moment solenoid switch of electropneumatic valve operates, and additional air from air bottles is delivered into engine providing sharp increase of its power. When preset maximum supercharging pressure is obtained to which transmitter installed in intake manifold is adjusted, delivery of additional air into engine is stopped. EFFECT: increased pickup under extreme conditions with accelerator of tank in extreme position. 2 cl, 1 dwg

Description

 The invention relates to the field of armored vehicles, in particular to the power plants of tanks.

 A device for increasing the throttle response of a tank power plant is known, comprising a turbo-piston diesel engine with an intake manifold, an air engine start system equipped with an electro-pneumatic valve and an air cylinder pneumatically connected to a reduction gearbox (1).

 In the known device, the problem of increasing throttle response is solved by increasing the fuel supply to the engine cylinders at maximum loads. However, the increase in power in the known device is insufficient and limited by the amount of air supplied to the cylinders. The high pressure air system is only used when starting the engine.

 A device is known for increasing the throttle response of a tank power plant, comprising a turbo-piston diesel engine with an intake manifold, an air engine starting system equipped with an air cylinder pneumatically connected to a reduction gear, an electro-pneumatic valve, an electric boost pressure sensor and a fuel supply pedal (2).

 The disadvantages of the known device are its complexity and low efficiency in transient, transient processes.

 The present invention is to improve the throttle response of the power plant while simplifying the design.

 The problem is solved in that the device is equipped with a micro switch installed under the pedal with the ability to close and provide voltage to the winding of the traction relay of the electro-pneumatic valve, and the boost pressure sensor is equipped with a membrane with normally closed contacts and a spring, while the membrane is installed with the ability to open contacts when the value is exceeded boost pressure to which the spring is adjusted.

 A diagram of the described device is shown in the drawing.

 The device contains air cylinders 1, air filter 2, gear 3, pipelines 4, electro-pneumatic valve 5, intake manifold 6, engine 7, boost pressure sensor 8, membrane 9 with normally closed contacts, spring 10, cover 11 of boost pressure sensor 8, switch 12 located on the dashboard of the driver, the microswitch 13 and the pedal 14 of the fuel supply.

 The proposed device operates as follows. Before starting the movement, the driver turns on the switch 12, thereby preparing the system for operation. In the process of moving the tank, the nature of the engine can be represented by peculiar cycles, including acceleration, steady state and braking. All these cycles can be divided into two groups. The first is the cycles that occur without fail under the influence of the driver on the engine controls. In this case, acceleration always occurs when the engine is running according to an external characteristic, at maximum fuel supply, and deceleration occurs when operating in the braking mode. The second group of cycles is small cycles that occur without the intervention of the driver, with the fuel pedal unchanged. The presence of such cycles is determined by the microroughnesses of the terrain. It should be noted that the most unfavorable, from the point of view of the flow of the working process, is the first group of cycles. Therefore, the main attention will be paid to the consideration of this group of cycles.

 So with a sharp movement by the driver of the fuel pedal 14 of the fuel supply in the direction of increasing the supply, the microswitch 13 located under it closes, while supplying voltage through normally closed contacts of the boost pressure sensor 8 to the winding of the traction relay of the electro-pneumatic valve 5.

 The electro-pneumatic valve 5 is activated and provides air to the intake manifold 6 of the engine 7, making up for the missing amount of air coming from a turbocharger (not shown) during the acceleration period.

 When the air pressure in the intake manifold 6 reaches the set value by which the spring 10 of the boost pressure sensor 8 is adjusted, the membrane 9 will bend under air pressure, overcoming the resistance of the spring 10, and open the normally closed contacts of the sensor 8. At the same time, the winding of the traction relay of the electro-pneumatic valve 5 will be de-energized and the air supply from the cylinders 1 will be stopped regardless of the position of the fuel pedal 14.

 During engine operation, when the boost pressure is greater than the value by which the spring 10 of the boost sensor 8 is adjusted, its contacts will be open, since the membrane 9 will bend under the influence of air pressure and break the electric supply circuit of the electropneumatic valve 5. In this case, even if the mechanic - the driver will close the microswitch 13, air from the cylinders 1 will not be supplied to the intake manifold 6.

 As the engine load increases, the exhaust gas pressure in front of the turbine (not shown) will decrease, the turbocharger speed will decrease, and the boost pressure will become lower. As a result, the spring 10 of the sensor 8 will return the membrane 9 to its original position and close the power supply circuit of the electro-pneumatic valve 5. The electro-pneumatic valve 5 will operate and the air from the cylinders 1 will begin to flow into the intake manifold 6. As the boost pressure builds up, the membrane 9 will bend and open its contacts, turning off the electro-pneumatic valve 5 and stopping the supply of additional air.

 The consumed amount of air from the cylinders 1 will be replenished with a standard compressor (not shown) of the engine.

 Thus, the installation of an additional device in the air launch system allows to increase engine throttle response, its energy and economic indicators, reduce the temperature of exhaust gases in front of the turbine, thereby ensuring its more reliable operation, as well as increasing the dynamic qualities and survivability of the object on the battlefield due to improvement engine throttle response.

 The simplicity of the proposed device will allow you to easily and quickly implement this invention during the modernization of objects of armored vehicles.

Sources of information
1. Object 172M, Technical Description and Operating Instructions, Book Two, Moscow: Military Publishing House, 1975, p. 65-201.

 2. USSR author's certificate N 344150, IPC F 02 D 23/02, publ. 07/07/1972.

Claims (1)

 A device for increasing the throttle response of a power plant of a tank, comprising a turbo-piston diesel engine with an intake manifold, an air engine start system equipped with an air cylinder pneumatically connected to a reduction gear, an electro-pneumatic valve, an electrically connected boost pressure sensor and a fuel supply pedal, characterized in that it equipped with a micro switch mounted under the pedal with the ability to close and provide voltage to the winding of the traction relay of the electro-pneumatic valve, and the charge pressure sensor is equipped with a membrane with normally closed contacts and a spring, while the membrane is installed with the ability to open the contacts when exceeding the value of the boost pressure to which the spring is adjusted.