The method of stabilization of minimum specific fuel consumption of the internal combustion engine and device for its implementation

 

(57) Abstract:

Use: machines and machine units with internal combustion engines equipped with manual transmission and continuously variable variator speed. The essence of the invention: method of stabilization of minimum specific fuel consumption of the internal combustion engine (ice) and the device for its implementation at a given position of the fuel injection body set the rotation speed of the engine corresponding to the minimum fuel consumption, compare the measured value with the set, the difference signal controls the variable speed, forming the desired mechanical characteristics, while the measured speed is compared with the value of the permissible deviation of this parameter from the set, above which produces the control signal transmission. The invention eliminates the work of the internal combustion engine in transient conditions. 2 S. p. f-crystals. 2 Il.

The invention relates to the use of internal combustion engines in cars and machinery units for various purposes, in particular, is intended for use in vehicles equipped with a gearbox with stupas is ptx2">

A known way to increase the efficiency of the machine, which consists in adjusting the speed of the vehicle when changing traction [1, Fig. H. 8] the Disadvantage of this method is the need to have a transmission with a large number of gears and a complex system of automatic activation of the corresponding transmission depending on the load mode.

There is a method of automatic control of transmission [1, Fig. H. 10] (transfer of Levin), supporting the transmission with high efficiency. However, this method requires freewheel, which limits the use of the transmission and is a disadvantage.

The known device and method of increasing the fuel efficiency of vehicles with diesel engine [2] consists in the fact that in addition to using all-mode regulator frequency of rotation affecting the position of the slats of the fuel pump, measure the torque on a shaft connecting the flywheel of the diesel engine with a pump wheel of the torque Converter (GT), produces an electrical signal proportional to the torque on the crankshaft, which affects solenoide in its essence is the closest to the proposed and adopted for the prototype. A significant disadvantage of the prototype is the need to control the position of the fuel injection of the working body when the load changes on the crankshaft.

The purpose of the invention, the reduction of specific fuel consumption and optimization of operation mode of the internal combustion engine on a vehicle equipped with a manual transmission and the option with the stepless change speed under variable load condition.

The goal when using the proposed method is achieved by changing the load on the shaft gearbox transmitted to the output shaft of the variator (for example, turbine shaft GT) is changed and the speed of the input shaft of the variator (pump shaft GT), which is fixed by the speed sensor, output speed sensor is compared with a reference signal determined by the installed position of the fuel injection of the working body, a differential signal is amplified to the required size, is fed to the control input of the variator (reactor GT), thereby altering the mechanical characteristics, bringing about its inversely proportional speed from the moment of resistance, stabilished to the device stabilization mode of the internal combustion engine equipped with a relay element (two-threshold comparator with hysteresis) associated with their outputs through amplifiers to the input of the control gear. The input signal to the comparator is the frequency deviation of rotation of the pump shaft GT from a given significant value when regulating the ability of the variator (GT) have been exhausted and the change in the value of the moment of resistance cannot be compensated for by changing the mechanical characteristics of the variator while maintaining constant the speed of the pump shaft. In this case, the deviation of the rotational speed is fed to the input of the relay element, causing its actuation, the output amplified signal is fed to the control mechanism of the transmission, causing the change of the gear ratio of a transmission (by inclusion), resulting thereby in compliance with the drag torque and the torque delivered by the internal combustion engine with the minimum specific fuel consumption.

The proposed solution differs from the prototype in that it comprises a speed sensor pump shaft GT, the CPA device is military speed at a predetermined value, and the first input of the comparison of the desired and the measured frequency of rotation is connected to the output of the speed sensor, the second input of the comparator connected to the output fuel injection of the working body, the output of the comparator of the frequency of rotation is connected to the input of the amplifier, which is loaded on the controlled reactor GT, at the same time the output compare frequency of rotation connected to the first input of the relay element, to the second input of which is filed with the maximum allowable deviation value, the outputs of the relay element connected to the inputs of amplifiers, loaded to the inputs of the control device of a transmission ratio of the gearbox.

The principal distinguishing feature of the proposed method is that the stabilization of the mode of operation of the engine unlike the prototype is not due to the controlling influence on the fuel injection working body, and by automatic control of the transmission elements.

These differences allow to draw a conclusion on the conformity of the proposed technical solution the criterion of "novelty". The features distinguishing the claimed technical solution from the prototype have been identified in other technical solutions in the study of this, see the "significant differences".

The proposed method is implemented by the device block diagram is shown in Fig. 1. In Fig. 2 shows: 1 external characteristics M=f(), 2 regulatory branch characteristics M=f(w), 3 regulatory branch characteristics g=f(w), 4 external characteristics g=f(w), where M and w, respectively, the torque on the shaft and the engine speed, g the specific fuel consumption of the engine.

The device (Fig. 1) contains the unit 1 fuel supply body with the output signal h, the inverter 2 of the fuel injection position of the body in the reference signal angular frequency of rotation of the output shaft of the internal combustion engine compares the device 3 with the output signal Dw=ass-2, transformer 4 of the reference signal in the control signal h1reactor GT 5 with the sensor 6 speed with the output signal w2, relay element 7.1 compares the value with the limit value DwCRConverter 7.2 signal = -CRin the control signal transmission 9.

The device operates as follows.

With the help of block 1 is set to a certain position of the fuel injection of the working body (TPRO) (choke in the carburetor of the internal combustion engine system that sets the spring tension Seregin the treatment, who sets the specifiedassthe rotational speed of the motor shaft, which is provided close to the minimum specific fuel consumption (see Fig. 2).

When the rotational speed of the pump shaft GT 5 is equal to a specified, is set to a certain position of the controlled reactor of the torque Converter. Changing moment MS(t), transmitted from the transmission 9 on GT 5, causes a change in the rotation frequency1the pump shaft. Change 1fixed sensor 6 and a signal2comes in box 3 comparison.

In the case of the error signalsassand2the signal input to the amplifier 4, which is produced by the control action of h1passed at a controlled reactor GT 5, the rotation of the blades of the reactor changes the mechanical characteristics of the GT, which ensures the removal of the pump wheel at a given frequency w1rotation.

If there is a significant change in the level of the input variable MS1(t) and controlling functions of GT have been exhausted, there is unregulated frequency change1. As soon as the specified value exceeds the tolerance valueCRin the operation of the switch.1 and 8.2 provide a corresponding gear change, making changes the signal level MS2(t), which is the range where the regulated value1.

The proposed method and device provide optimization of internal combustion engines, namely, that govern GT and transmission at a constant position of the fuel injection of the working body, so that is ice on part of the regulatory branch of the high-speed characteristics determined by size (Fig. 2), where the specific fuel consumption is close to the minimum, and the frequency of rotation of the pump shaft, and, consequently, motor quasi-permanent. The latter eliminates the need to work on ice uneconomical transient conditions in the continuously changing moment of resistance.

1. The method of stabilization of minimum specific fuel consumption of the internal combustion engine by the automatic regulation of the mode of its work on the basis of the feedback element of the transmission, characterized in that at a given position of the fuel injection of the working body set the rotation speed of the engine corresponding to the minimum specific fuel consumption, measure the frequency of rotation of the shaft while changing the external money fed to the control input of a stepless variable speed, change its mechanical characteristics, aligning them to mind inversely related to the frequency of rotation of the output shaft of the variator from the moment of resistance, while the measured value of the rotational speed of the input shaft of the variator (motor shaft) is compared with the permissible deviations of this parameter from the set above which produce a signal that causes it to shift the transmission, and lead the magnitude of the moment of resistance to a range which provides continuously variable control of frequency of rotation of the output shaft of the variator.

2. The device stabilization of minimum specific fuel consumption of the internal combustion engine, fuel injection containing a working body, equipped with automatic control system with feedback from the element transmission, manual transmission and a CVT with stepless speed control, characterized in that it further provided with a Converter fuel injection position of the working body in the reference signal of the engine speed, the speed sensor input shaft of the variator (motor shaft), the comparator frequency rotations is a means of comparing the difference of rotation speed with a valid, inverter control mechanism, the gearbox shift, and the output of the comparator frequency of rotation of the motor shaft with the set associated with transducer frequency difference of rotation in the signal control mechanism that modifies the mechanical characteristics of the variator, and to the first input of the comparator differential speeds with the maximum, the output of which is connected to the input of the signal Converter comparison in the control signal transmission.

 

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