Starter-generator

FIELD: automotive industry.

SUBSTANCE: starter-generator comprises two-phase rectifying inductive machine with electromagnetic asymmetry, transistor commutator made of the minimum number of switches. The main winding of each of two phases is connected with the power source through a transistor of the inverter. Each recuperating winding of two phases is connected with the power source through a diode of inverter.

EFFECT: simplified structure and reduced losses.

3 dwg

 

The present invention relates to electrical transport and is intended for use in automotive, aircraft and shipbuilding, stand-alone voltage generators, devices for testing internal combustion engines (ice) and other to start the internal combustion engine and generating electric power for the needs of the on-Board electrical network.

Known starter-generator, collector containing a DC motor, mechanical transmission and alternator with rectifier and the field winding on the rotor, is connected through slip rings to the control unit of the generator voltage, and mechanically connected to the shaft of the internal combustion engine through a belt drive, the rotor commutator motor in the mode of his starter is mechanically linked with the flywheel shaft of the internal combustion engine (UTC VE Electrical cars. - M., Transport, 1995. - 303 S.).

The disadvantages of this device are high design complexity, due to the presence of two electric machines, mechanical gearbox, belt drive and flywheel, large energy losses due to friction in the mechanical transmission, limited lifetime pinion gear of the starter with the flywheel of the internal combustion engine, low securely the th elements mainly, belt transmission connecting the shaft of the internal combustion engine with a generator and a DC motor with brush-collector node.

Known starters-generators containing asynchronous machine, the conclusions of the three-phase windings which are connected with the conclusions of the three-phase pulse width modulation voltage, control inputs connected with the output of the automatic control unit, and electroepitaxy input via optional Converter direct current connected to the terminals of the battery, the shaft of the asynchronous machine is connected through gearing to the shaft of the internal combustion engine (Patent RF №2173020, 2001, IPC NR 9/44; F02N 11/04. RF patent №2150602, 2000, IPC F02N 11/04). In such starters-generators use one of the asynchronous electrical machine is operating in motor mode when starting the internal combustion engine and generator during operation of the engine.

The disadvantages of such devices are the complexity of the power supply circuits of an induction motor, containing a three-phase inverter and an additional DC-to-DC, and large energy losses and voltage. The current from the battery to the motor windings flows through three series-connected transistor key (two keys inverter and the key additional DC-to-DC). When the voltage of the batteries transport is rest 12...27 and In high current mode starter power losses on these items commensurate with the capacity of starter.

Known technical solutions the closest the result achieved by the proposed device is a starter-generator for internal combustion engines, containing a valve-induction machine, the rotor of which is mechanically connected to the crankshaft of the internal combustion engine and the position sensor, power switch, sensors phase currents, switch to the "starter-generator, and the control unit, the input of which is connected to the outputs of the position sensor, sensors phase currents and switch to the "starter-generator, and outputs connected to control inputs of the power switch (Fahimi Century, Emadi A., Sepe R.B. A Switched Reluctance Machine-Based Starter/Alternator for More Electric Cars / IEEE Transactions on energy conversion / Vol.19, No 1, March 2004. - P.116-124).

The disadvantages of this device are the complexity of the power supply circuits of the switched-reluctance motor (when using three-phase motor diagram contains six transistors and six diodes, and using four of the engine's eight transistors and eight diodes), as well as large energy losses and voltage in transistor switches and diodes. When battery voltage 12...27 and In high current mode starter power losses on these items commensurate with the capacity of starter.

The purpose of the invention is to simplify the design of the device and a decrease in the er energy management system elements.

This objective is achieved in that in a starter-generator for internal combustion engines, containing a valve-induction machine, the rotor of which is mechanically connected to the crankshaft of the internal combustion engine and the position sensor, power switch, sensors currents, switch to the "starter-generator, and the control unit, the input of which is connected to the outputs of the position sensor, sensors currents and switch to the "starter-generator, and outputs connected to control inputs of the power switch, optionally switched-reluctance machine is made of two-phase electromagnetic asymmetry, each phase contains two windings, the primary and recuperation, power switch contains four transistor switch and four diode, the beginning of the two main windings are connected together and through the first current sensor connected to the positive terminal of the battery, and the ends respectively through the first and second transistor switches are connected with the negative terminal of the battery, the two ends of the recuperation of the windings are connected together and through a second current sensor connected to the positive terminal of the battery, and start over, respectively, the first and second diodes connected to the negative terminal of the battery, the end of the first primary winding through sequentially connect the installed third diode and the third transistor switch is connected to the positive terminal of the battery, the end of the second primary winding is connected through serially connected to the fourth diode and the fourth transistor switch to the positive terminal of the battery.

Compared with the closest similar technical solution proposed device has the following new features:

- switched-reluctance machine is made of two-phase electromagnetic asymmetry, each phase contains two windings, the primary and recuperation;

the power switch contains four transistor switch and four diode;

- the beginning of the two primary windings are connected together and through the first current sensor to the positive terminal of the battery, and the ends respectively through the first and second transistor switches are connected with the negative terminal of the battery, the two ends of the recuperation of the windings are connected together and through a second current sensor connected to the positive terminal of the battery, and start over, respectively, the first and second diodes connected to the negative terminal of the battery, the end of the first primary winding connected in series through the third diode and the third transistor switch is connected to the positive terminal of the battery, the end of the second primary winding is connected through serially connected to the fourth diode and the fourth transistor switch to the positive terminal of the battery.

With edutella, the claimed technical solution to meet the requirement of "novelty".

When implementing the present invention simplifies the design of the starter-generator by simplifying the power section of the system control transistor switch contains the minimum number of keys - 4. The primary winding of each of the two phases is connected to a power source through one transistor of the inverter, and each of the recuperation of the windings of the two phases is attached to a power source through one diode of the inverter,

Therefore, the proposed solution meets the requirement of "positive effect".

For each distinctive feature conducted a search of the known technical solutions in the field of electrical engineering, electric and electric vehicles.

Starters-generators, containing a two-phase switched-reluctance machine with magnetic asymmetry, each phase of which contains two windings, the primary and recovery, and the power switch contains four transistor switch and four diode, the beginning of the two main windings are connected together and through the first current sensor connected to the positive terminal of the battery, and the ends respectively through the first and second transistor switches are connected with the negative terminal of the battery, the two ends of the recuperation of the windings are connected VM is the extent and through a second current sensor connected to the positive terminal of the battery, and the beginning of after, respectively, the first and second diodes connected to the negative terminal of the battery, the end of the first primary winding connected in series through the third diode and the third transistor switch is connected to the positive terminal of the battery, the end of the second primary winding is connected through serially connected to the fourth diode and the fourth transistor switch to the positive terminal of the battery, in the known technical solutions are not found.

Thus, these characteristics provide the claimed technical solution according to the requirement of "substantial differences".

The essence of the invention is illustrated by drawings. Figure 1 shows the functional diagram of the starter-generator, figure 2 shows the timing chart of its operation, starter, figure 3 shows the chart of the operation of the generator. Figure 1 is displayed: 1 - mode switch "starter - generator; 2 - control unit; 3 - power switch, containing the first 4, second 5, third 6 and fourth transistor 7 keys, first 8, second 9, the third 10 and fourth diodes 11, 12 and 13, the first and second sensor currents, 14 two - phase switched-reluctance machine with electromagnetic asymmetry containing the rotor 15, the first core 16 and recuperation 17 winding (phase A), the second core 18 and recuperation the winding 19 (phase In); 20 - position sensor; 21 - the internal combustion engine; 22 - battery.

In the proposed starter-generator switched-reluctance machine 3 is made of a two-phase electromagnetic asymmetry, each phase (a and b) contains two windings - primary (16 and 18) and recuperation (17 and 19), the rotor 15 switched-reluctance machine 14 is mechanically connected to the crankshaft of the internal combustion engine 21 and the position sensor 20, the power switch 3 contains four transistor 4-7 and four diode 8-11, beginning two primary windings 16 and 18 are connected together and through the first current sensor 12 is connected to the positive terminal of the battery 22, and the ends through accordingly, the first 4 and second 5 transistor switches connected to the negative terminal of the battery 22, the ends of the two heat recovery coils 17 and 19 are connected together and through a second current sensor 13 is connected to the positive terminal of the battery 22, and the beginning of after, respectively, the first 8 and second 9 diodes connected to a common terminal of the battery 22, the end of the first primary winding 16 connected in series through the third diode 10 and the third transistor switch 6 is connected to the positive terminal of the battery 22, the end of the second primary winding 18 is connected through serially connected fourth diode 11 and the fourth transistor switch 7 to the positive terminal of battery 22

Diagram of the starter-generator mode of the starter shown in figure 2, where indicated: LAthe inductance of the primary winding of phase a; LBthe inductance of the main winding phase; Lmin, Lmax- the minimum and maximum values of inductance; uB4uB6uB5uB7- control voltage at the inputs of transistor switches, respectively, 4, 6, 5, 7; i16, i17, i18, i19- current windings respectively 16, 17, 18 and 19; θ - the angle of rotation of the shaft.

The starter-generator mode, the starter works as follows. The mode switch 1 is set To ("starter"). The control unit generates the control pulses for the transistor switches 4, 5, 6 and 7 in accordance with the signals of the position sensor rotor 20 so that the inclusion of transistor corresponding phase occurs at a consistent position of the rotor. Transistor switch 4 (phase A) at 0≤θ≤θ1is open, current from the battery flows through the primary winding 16. The mechanical torque developed by the phase And equal to

because.

When this,

where E is the voltage of the battery;

Δu4- the voltage drop across the open key 4;

r16active resistance is erway primary winding 16.

When θ1≤θ≤θ2transistor switch 4 (phase A) is open, current from the battery flows through the primary winding 16. Thus

;.

While MA>0 andcurrent i16and the moment MAincrease with increasing angle θ.

When θ2≤θ≤θ6the phase And mode current limiting occurs. Transistor switches 4 and 6 (phase A) are switched in accordance with the signals of the control unit 2. When transistor keys 4 and 6 EMF of self-induction phase And is closed through the coil 16, the current sensor 12, the diode 10 and an outdoor transistor 6. Thus

,

where Δu6- the voltage drop across the outdoor transistor 6;

Δu10the voltage drop across the diode 10.

Current i16reduced energyaccumulated in the inductance is converted into mechanical work performed by the engine, and partially dissipated in the active resistance r16winding and transistor 4 key. At this point, MA>0.

When you open transistor key 4 and the closed transistor 6 key processes similar to the processes occurring at θ1≤θ≤θ2.

When θ6≤θȤ θ8transistor switches 4 and 6 are closed, the diode 8 is open. Thus

,

where Δu8the voltage drop across the diode 8.

The recovery current of the first winding i5reduced. When this happens the energy recoverythe inductive storage phase in the battery 22 and, consequently, charging of the battery 22. Current i17recuperation winding decreases, the time

.

When θ8≤θ≤θ9transistor switches 4 and 6 are closed, the diode 8 is open.

Thus

since LA=const;

MA=0;

.

Current i17recuperation winding 17 decreases, the energy stored in the inductor is transferred to the battery 22.

The processes occurring in the phase In similar, but occur with a shift in the angle θ=θ6.

Current sensors 13 and 14 generate signals proportional to the currents of the main and heat recovery coils which are fed to the inputs of the control unit 2. The control unit 2 depending on the values of these signals adjusts the angles of the enable transistor switches and limits the currents of the windings of phases a and b in the maximum power mode.

Figure 3 shows graphs of the starter-GE is erator in generator mode. In this mode, the operation of the device is as follows. The mode switch 1 is set to G ("generator"). The control unit 2 generates the control pulses for the transistor switches 4, 5, 6 and 7 in accordance with the signals of the position sensor rotor 20 so that the inclusion of transistor corresponding phase occurs when the position of the rotor, close to a consensus.

When θ8≤θ≤θ9transistor switch 4 otkrytom i16proceeds from the battery 22 through the current sensor 13, the primary winding of phase a and the transistor switch 4. While LA=const;;

.

The current in the winding 16 increases, thus there is an accumulation of energy in the inductance of the winding of phase a, i.e. the initial excitation of the generator.

When θ9≤θ≤θ10transistor switch 4 is closed, and the transistor switch is open. When this;;. This means that the generator is load on the internal combustion engine. The mechanical energy from the internal combustion engine by reducing the inductance causes an increase of current i16.

When this.

Since the energy in the inductive the second drive is proportional to the value of this inductance and the square of the current, when a linear decrease in inductance is an increase in the current is proportional to the square of the inductance, resulting in energy accumulated in the inductance increases. Due to this, the generator excitation is mainly due to the mechanical energy from the internal combustion engine and only partially at the expense of battery.

When θ10≤θ≤θ12all transistor switches are closed and the diode 8 is open.

When this;;.

The current flowing through the recuperator coil 17 phases And charges the battery. Thus

.

Battery life is due to the energy stored in the inductance, and due to the mechanical work performed by the internal combustion engine.

When θ12≤θ≤θ13all transistor switches are closed.

When this;;;

.

The energy stored in the inductive storage device that provides battery power.

The processes in phase In a similar, but occur with a shift relative to the phase angle θ=θ6.

Thus, the use of starter-General the re for internal combustion engines, containing the switched-reluctance machine, the rotor of which is mechanically connected to the crankshaft of the internal combustion engine and the position sensor, power switch, sensors phase currents, switch to the "starter-generator and the control unit, the input of which is connected to the outputs of the position sensor, sensors phase currents and switch to the "starter-generator, and outputs connected to control inputs of the power switch, optionally a two-phase switched-reluctance machine with magnetic asymmetry, each phase of which contains two windings, the primary and recovery, and the power switch contains four transistor switch and four diode, beginning the two main windings are connected together and through the first current sensor connected to the positive terminal of the battery, and the ends respectively through the first and second transistor switches are connected with the negative terminal of the battery, the two ends of the recuperation of the windings are connected together and through a second current sensor connected to the positive terminal of the battery, and start over, respectively, the first and second diodes connected to the negative terminal of the battery, the end of the first primary winding connected in series through the third diode and the third transistor switch is connected to the positive terminal of the battery, the end vtoro the primary winding is connected through serially connected to the fourth diode and the fourth transistor switch to the positive terminal of the battery, allows to simplify the design of the device and to reduce energy losses in the control system elements.

The use of the proposed solution in cars will increase the efficiency and quality of the starter-generator device.

The starter-generator for internal combustion engines, containing a valve-induction machine, the rotor of which is mechanically connected to the crankshaft of the internal combustion engine and the position sensor, power switch, sensors currents, switch to the "starter-generator and the control unit, the input of which is connected to the outputs of the position sensor, sensors currents and switch to the "starter-generator, and outputs connected to control inputs of the power switch, characterized in that it further switched-reluctance machine is made of two-phase electromagnetic asymmetry, each phase contains two windings, the primary and recovery, power switch contains four transistor switch and four diode, the beginning of the two main windings are connected together and through the first current sensor connected to the positive terminal of the battery, and the ends respectively through the first and second transistor switches are connected with the negative terminal of the battery, the two ends of the recuperation of the windings are connected together and h is cut a second current sensor connected to the positive terminal of the battery, and the beginning of after, respectively, the first and second diodes connected to the negative terminal of the battery, the end of the first primary winding connected in series through the third diode and the third transistor switch is connected to the positive terminal of the battery, the end of the second primary winding is connected through serially connected to the fourth diode and the fourth transistor switch to the positive terminal of the battery.



 

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The invention relates to electrical engineering, namely to the starter-generator devices of vehicles with internal combustion engines (ice)

FIELD: electrical engineering.

SUBSTANCE: invention relates to control systems of starter-generator plants of vehicles powered by internal combustion engines. According to invention, at operation of control system of starter-generator made of base of synchronous machine phase currents are measured and results are converted into rotating orthogonal system of coordinates whose one axis is directed along longitudinal axis of machine. Then actual values of currents are compared with preset values which are formed with due account of signal from accelerator pedal pressed-on sensor. Basing of results of comparing instantaneous signs of phase voltage are determined.

EFFECT: minimization of additional (switching) losses in machine and power converter.

3 cl, 4 dwg

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