SU1257263A1 - Method of control of tractor-mounted engine/transmission unit - Google Patents

Abstract

The invention relates to engine building and can be used in electronic automatic control systems. The purpose of the invention is to improve the economic performance of engines. When the engine is operated with microcomputer control and electronic speed control, they set constant power values. The required rotational speed is determined by dividing the reference by the actual torque. At the same time, according to the experimentally determined characteristics, a connection is established between the pressurization, the cycle feed and the rotation frequency 4 sludge. ts: SP yu 05 GS

Description

The invention relates to the field of control of a tractor engine-transmission installation, in particular to the control of a constant power engine.

The purpose of the invention is to improve the economic performance of an electronically controlled engine-transmission unit when operating in a constant mode due to a higher quality of power control, which is ensured by the implementation of a strictly hyperbolic feed cycle versus rotation frequency and maintaining the optimum charge ratio and the fuel cycle value.

FIG. shows a functional diagram of the system, control, operating according to the proposed method; in fig. 2 is a graph of setting power levels Nj, Ng and Nj as a function of time; in fig. 3 - dependence of the rotational frequency on the magnitude of the electrical signal Up at the output of the rake frequency regulator; in fig. 4 - signal dependence on actual torque M.

The specified value of the power Nja in the form of an electrical signal is assigned to the input of the l. 1 and is divisible. The second signal of the electronic regulator 2 of the rotation frequency is applied to the second input of the divider, affecting the fuel generator 3 and determining feed cycle and torque. This signal is a divider.

The dividing frequency setpoint is from the stroke of the divide: 1 is input to the electronic speed controller, the second input of the electro frequency controller is connected to the signal from the speed sensor 4 engine. At the output of the electronic frequency regulator, an electric signal Uo is generated, determined by the power supply: the first cycle feed and affects the fuel system and the engine supercharging control device 5. The input parameters for diesel 6 are the fuel delivery cycle that determines Torque and pressure nad) The defined ti is achieved by the fact that the setpoint is entered into the control system in the form of setpoints of engine power M. The setpoints of frequency 4) of engine rotation are determined in systems Controlling the division of a given Naa power by the value of the actual torque of the moment, which, like the feed cycle, is determined by the electrical signal at the output of the electronic automatic speed controller Up By the formula

M, p - to Up, where k is the proportionality coefficient.

0

The setpoint speed is determined by the formula

and the amount of boost is set to

The national dependence is also dependent on the magnitude of the electrical signal at the output of the electronic automatic control of the rotation frequency and is determined by the formula

P f (Uf)

The type of functional dependence is established experimentally during engine development.

With a constant power, any change in torque on the shaft

5 engine or cyclic fuel supply causes a hyperbolic law to change the set rotational speed. Simultaneously with the change in the cycle feed, the charge is changed, which allows for each load mode to be optimal

0 is a combination of fuel supply and air charge parameters and that allows to improve the quality of regulation in transient conditions such as transition time, the amount of overshoot PIA.

For battery fuel systems, the cycle flow is a function of two parameters — the injection duration and fuel pressure in the battery. At a constant pressure, the fuel cycle flow rate is proportional to the injection duration, which in electronic control systems is determined by the electrical signal at the output of the rotational speed controller Up. Since the torque M is determined by cyclic feed, i.e. the duration of the injection, therefore, is proportional to the electrical signal at the output of the speed controller M KUp.

In the proposed method, the setpoint value of the rotational speed is determined by dividing the setpoint power by the value of the actual torque torque, for which the electrical signal from the output of the rotational speed controller is used, i.e.

Consider the operation of the device implementing the proposed control method, using graphical dependencies relating to the specified power Njafl, rotational frequency OJ, electrical signal at the output of the rotational speed regulator Up, and torque M. three levels of power, Nj, Nj and Nj, are given, N. In 5 depending on time, this is expressed by the graph shown in FIG. 2

Each power value corresponds to its own hyperbola, connecting between so5

0

five

bout the frequency and rotation and the magnitude of the electrical signal at the output of the frequency control U

These dependencies are shown in FIG. 3

FIG. 4 The dependence of U $ on the real torque M. is presented.

The magnitude of the electrical signal at the output of the speed regulator is limited by the minimum and maximum values of Uptnfn and.

Suppose that during operation, the load moment changed from the value of Ma. to the value of Ms, and Md .. In this case, the value of the electrical signal at the output of the regulator will change and will take on the value. In the hyperbole family of FIG. 2, by the hyperbola corresponding to one of the given values of the power N, N or Nj the required value of the frequency a of rotation is determined. The possible values of iJ lie in the region bounded by the dependences of the Ax and U)

If the magnitude of the rotation frequency found from a hyperbolic dependence, for example, the corresponding Nj is less than the minimum acceptable. Then the operator, by moving the pedal or controller, sets the lowest value of the Na NjH power and automatically sets the new value of the rotation frequency.

The electronic speed regulator and divider can be implemented in the control microcomputer, in addition to controlling the rotational speed and power, and other functions associated with the operation of the tractor, and the use of microcomputers allows unifying control systems of various types of engines operating in mode. constant power, where the transition from a control system of one type of engine to a control system of another type of engine is reduced to a programmatic change of the coefficient of proportionality K and introduced nd new functional dependence (Up).

The proposed method of controlling the tractor engine-transmission installation improves the economic performance of the engine-transmission installation due to

higher quality of power control, which is ensured by the implementation of a strictly hyperbolic dependence of the cycle fuel supply on the rotational frequency and maintaining the optimum ratio of the boost and the cycle supply value in transient and steady-state operating conditions.

The use of microcomputers to control the rotational speed and power of the proposed method allows to unify the control systems of various types of engines operating in constant power mode.

Claims (1)

Invention Formula A method of controlling a tractor engine-transmission unit, which consists in determining the actual torque and determining the amount of boost, carried out by the microcomputer while the electronic automatic controller sets the engine speed setpoints, and modifies the electrical signals controlling cyclic fuel supply, characterized in that, in order to improve the economic performance of the engine-transmission unit when operating in the constant power mode, the setpoint is entered into the control system as setpoint values of the engine power, and the setpoint values of the engine rotational speed are determined in the control system by dividing the setpoint power values by the actual torque, which is used as the electrical signal from the output of the electronic automatic speed regulator that determines the amount of cyclic fuel supply at a given time, and the amount of boost is determined depending on an electrical signal at the output of an electronic automatic speed regulator, which determines the cycle fuel supply in accordance with experimentally determined for each type of engine, the dependence of the boost on the magnitude here are cycle feeds.  Vjae lz g one cpas.Z Upmini Vpa 2 Upf 3 Up, Up srig.Z I 1 ma -f  Af Compiled by N. Patrakhaltsev Editor A. RevinTehred I. VeresKorrektor V. But ha Order 4895/29 Circulation 523 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5 Branch PPP "Patent, Uzhgorod, st. Project, 4 4