JP2018033298A - Stop control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stop control system which can impart brake torque to an engine up to a region in which a rotational speed of the engine is lower during the stop control of the engine.SOLUTION: A stop control system comprises an engine (10) for generating a drive force by the combustion of fuel, and rotating electric machine modules (20, 60) having rotating electric machines (21, 69) which can generate power by the drive force of the engine, and a power supply (30) which is charged by the power supplied by the rotating electric machine modules. The stop control system performs control for stopping the engine. In the stop control system, a closed circuit is formed in which induction currents generated at the rotating electric machines flow without bypassing the power supply after the combustion of the fuel by the engine is stopped.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stop control system that performs control to stop an engine.

  Conventionally, so-called idling stop control is known in which an engine is automatically stopped when a predetermined automatic stop condition is satisfied. According to this control, it is possible to improve the fuel consumption reduction effect of the engine.

  However, even if the fuel supply to the engine is stopped because a predetermined automatic stop condition is satisfied, the engine does not stop immediately, but stops after idling according to inertia. For this reason, the time from when the fuel supply to the engine is stopped until the engine is completely stopped becomes longer, the fuel remaining in the intake port is reduced, and the initial explosion at the time of restart is delayed. There is a possibility that problems such as deterioration of startability may occur.

  As a countermeasure, in Patent Document 1, when the engine is automatically stopped due to the establishment of the automatic stop condition, control is performed so that the motor provided in the hybrid vehicle is in a power generation operation. A load is applied to the engine by the power generation operation of the motor, and the rotational speed of the engine can be rapidly lowered, so that the engine can be stopped quickly.

Japanese Patent No. 3,909,641

  By the way, Patent Document 1 describes that the power generation operation of the motor is stopped when the rotational speed of the engine becomes substantially zero. However, if the rotational speed of the engine decreases and the generated voltage of the motor becomes less than the voltage of the power source provided in the vehicle, the motor may not be able to perform the power generation operation. In this case, the motor cannot give a braking torque to the engine and cannot stop the engine quickly. Even if the power generation operation of the motor can be carried out, it is considered that the braking torque applied to the engine by the motor is small, and there is a possibility that the time until the engine stops completely becomes long.

  The present invention has been made to solve the above-described problems, and a main object of the present invention is to apply braking torque to the engine to a region where the engine rotational speed is lower during engine stop control. It is to provide a stop control system.

  1st invention is charged with the electric power supplied by the engine which generate | occur | produces driving force by combustion of fuel, the rotary electric machine module which has the rotary electric machine which can generate electric power with the drive force of the engine, and the rotary electric machine module A stop control system for executing control to stop the engine, and after the combustion of the fuel by the engine is stopped, an induced current generated in the rotating electrical machine does not pass through the power source. A closed circuit that flows is formed.

  In order to realize a quick stop of the engine, there is a case where after the combustion of fuel by the engine is stopped, power generation by the rotating electrical machine is performed and a braking torque of the rotating electrical machine is applied to the engine. The magnitude of the induced electromotive voltage generated in the rotating electrical machine depends on the engine speed. For this reason, if the induced electromotive voltage generated in the rotating electrical machine becomes lower than the voltage of the power supply due to a decrease in the rotational speed of the engine, the induced current generated in the rotating electrical machine cannot flow to the power supply, and power generation by the rotating electrical machine cannot be performed. There is a fear. In this case, the rotating electrical machine cannot apply a braking torque to the engine and cannot quickly stop the engine. Even if the rotating electrical machine can generate power, the braking torque applied to the engine by the rotating electrical machine is considered to be small, and there is a possibility that the time until the engine is completely stopped may be increased.

  As a countermeasure, in this stop control system, a closed circuit is formed in which the induced current generated in the rotating electrical machine flows without going through the power source after the combustion of fuel by the engine is stopped. As a result, even if the induced electromotive voltage generated in the rotating electrical machine is lower than the voltage of the power source due to a decrease in the rotational speed of the engine, the induced electrical current generated in the rotating electrical machine flows in the formed closed circuit. A braking torque can be applied to. That is, the braking torque can be applied to the engine up to a region where the rotational speed of the engine is lower, so that the engine can be stopped quickly. Further, in a system that automatically stops and restarts the engine, the engine restart timing can be advanced with the rapid engine stop. Therefore, the restartability of the engine can be improved.

  According to a second invention, in the first invention, the rotating electrical machine includes a field winding and a current adjusting unit that adjusts a magnitude of a current flowing through the field winding, and the current adjusting unit includes: In the period in which the closed circuit is formed, the magnitude of the current flowing through the field winding is adjusted so that the braking torque applied to the engine does not become larger than a predetermined torque.

  When this control is performed with the engine rotating at a high speed, the amount of braking torque applied to the engine is larger than when no closed circuit is formed because the closed circuit is formed without going through the power supply. It will be a thing. For this reason, in a configuration in which the engine and the rotating electrical machine are driven and connected by a belt or the like, for example, when the present control is performed with the engine speed being high, the magnitude of the braking torque applied to the engine is excessively large. Thus, it is conceivable that so-called “belt squealing” occurs in which abnormal noise is generated from the belt. As a countermeasure, during the period in which the closed circuit is formed, the adjustment unit adjusts the magnitude of the current flowing in the field winding so that the braking torque applied to the engine does not exceed a predetermined torque. Thereby, the magnitude of the braking torque applied to the engine can be adjusted to be smaller than the predetermined torque, and the occurrence of problems such as “belt squealing” can be suppressed.

  According to a third invention, in the first or second invention, the rotating electrical machine includes an armature winding, and an induced current adjusting unit that adjusts an average current magnitude of the induced current flowing through the armature winding. The induced current adjustment unit is configured to obtain an average current of the induced current that flows through the armature winding so that the braking torque applied to the engine does not become larger than a predetermined torque during the period in which the closed circuit is formed. It is characterized by adjusting the size.

  As another method for controlling the braking torque applied to the engine so as not to be larger than the predetermined torque, the average current magnitude of the induced current flowing through the armature winding may be adjusted. As a result, the magnitude of the induced current generated in the multiphase rotating electrical machine can be limited, and as a result, the braking torque applied to the engine can be suppressed from becoming larger than the predetermined torque.

  According to a fourth invention, in the invention according to any one of the first to third inventions, when the rotation speed of the engine is higher than a predetermined rotation speed after the combustion of the fuel by the engine is stopped, the rotating electric machine generates electric power. The closed circuit is formed when the rotational speed of the engine is lower than the predetermined rotational speed.

  When the rotating electrical machine is charged without forming a closed circuit, the magnitude of the braking torque applied to the engine depends on the magnitude of the induced current generated in the rotating electrical machine. In a situation where the rotational speed of the engine is higher than a predetermined rotational speed, it is considered that the braking torque applied to the engine is sufficiently large even if the power source is charged by the electric power supplied by the rotating electrical machine. For this reason, when the rotational speed of the engine is higher than the predetermined rotational speed, it is possible to apply a braking torque to the engine and charge the power source by causing the rotating electrical machine to generate power.

  On the other hand, when the rotational speed of the engine is lower than the predetermined rotational speed, the magnitude of the induced current generated in the rotating electrical machine by power generation is also small, and accordingly the magnitude of the braking torque applied to the engine by the rotating electrical machine is very small. It is thought that it becomes. Therefore, when the rotational speed of the engine is lower than the predetermined rotational speed, a closed circuit that does not pass through the power source is formed. As a result, the induced current generated in the rotating electrical machine is not reduced, and as a result, the braking torque applied to the engine by the rotating electrical machine can be suppressed from becoming smaller.

  A fifth invention is applied to a vehicle having an automatic stop function for automatically stopping the engine when a predetermined automatic stop condition is satisfied in any one of the first to fourth inventions, wherein the automatic stop condition is The closed circuit is formed after the fuel has been established and combustion of the fuel by the engine is stopped.

  In a vehicle having an automatic stop function (for example, an idling stop vehicle) that automatically stops the engine when a predetermined automatic stop condition is satisfied, automatic stop and restart frequently occur when turning an intersection or in a traffic jam. Conceivable. In an automatic stop vehicle equipped with this stop control system, the engine can be stopped quickly in such a situation, and the engine can be restarted early. That is, it can be said that it is particularly preferable to apply the stop control system to an automatic stop vehicle.

  In a sixth aspect based on any one of the first to fifth aspects, the rotating electrical machine module is a multiphase rotating electrical machine, and at least some of the phases of the plurality of phases of the multiphase rotating electrical machine are included. A plurality of first switching elements that can be opened and closed so as to be short-circuited, and the first switching element is opened and closed so that at least some of the phases of the plurality of phases of the multiphase rotating electrical machine are short-circuited. The closed circuit is formed by operating.

  Assume that this stop control system is applied to a multiphase rotating electrical machine. In this case, a plurality of first switching elements that can be opened and closed so that at least some of the plurality of phases of the multiphase rotating electrical machine are short-circuited are provided in the multiphase rotating electrical machine. As a result, after the combustion of fuel by the engine is stopped, the first switching element is opened and closed so that at least some of the phases of the plurality of phases of the multiphase rotating electrical machine are short-circuited. Closed circuit can be formed.

  In a seventh aspect based on the sixth aspect, the duty ratio of the first switching element is adjusted so that the braking torque applied to the engine does not become larger than a predetermined torque during the period when the closed circuit is formed. It is characterized by doing.

  As another method for controlling the braking torque applied to the engine so as not to be larger than the predetermined torque, the duty ratio of the first switching element may be adjusted. As a result, the magnitude of the induced current generated in the multiphase rotating electrical machine can be limited, and as a result, the braking torque applied to the engine can be suppressed from becoming larger than the predetermined torque. Moreover, overheating of the first switching element can be suppressed by suppressing an excessively large induced current from flowing through the first switching element.

  According to an eighth invention, in the sixth or seventh invention, after the combustion of the fuel by the engine is stopped, the plurality of first switching elements are opened and closed so that all phases of the multiphase rotating electrical machine are short-circuited. It is characterized by making it.

  By opening / closing the plurality of first switching elements so that all phases of the multiphase rotating electrical machine are short-circuited, fluctuations in braking torque applied to the engine can be reduced.

  According to a ninth invention, in any one of the first to fifth inventions, the rotating electrical machine module is an alternator, and includes a rectifying unit that rectifies the induced current generated by power generation, and is rectified by the rectifying unit. A stop control system configured to cause the induced current to flow to the power source, and a second switching element that opens and closes between the power source and the rectifier unit, and between the second switching element and the rectifier unit. A connection path that bypasses the power source and connects the positive electrode side and the negative electrode side of the rectifier unit, and the connection path includes a third switching element that opens and closes the connection path, and the third switching The closed circuit is formed by closing an element, and the second switching element is opened when the closed circuit is formed.

  In the stop control system configured as described above, a closed circuit in which the induced current generated in the alternator flows through the connection path without passing through the power source can be formed by closing the third switching element. However, in this state, the current flowing from the power source also flows through the connection path. For this reason, when the closed circuit is formed by closing the third switching element, the second switching element is opened. Thereby, the inflow of the electric current from a power supply to a connection path | route can be interrupted | blocked.

  In a tenth aspect based on the ninth aspect, the rectifier, the connection path, and the field winding of the alternator are connected in parallel to the power source, and the connection path includes a resistor. It is characterized by.

  The rectifier, the connection path, and the field winding of the alternator are connected in parallel to the power source. In this case, the magnitude of the voltage applied to the field winding is the same as the magnitude of the voltage applied to the connection path. Such that a sufficient voltage cannot be applied and a sufficient current cannot be supplied to the field winding. In preparation for this, by providing a resistor in the connection path, the voltage applied to the field winding can be increased, and a sufficient current can flow through the field winding. It can be made sufficiently large.

  According to an eleventh aspect of the present invention, in any one of the first to fifth aspects, the rotating electrical machine module includes a three-phase armature winding and a three-phase armature winding in the first system and the second system, respectively. Three switching elements connected in a three-phase bridge, and when forming the closed circuit, in the first system and the second system, three switching elements on the high voltage side of the six switching elements And open the three switching elements on the low voltage side, or open the three switching elements on the high voltage side of the six switching elements and open the three switching elements on the low voltage side in the first system and the second system. One switching element is closed.

  The rotating electrical machine module includes a three-phase armature winding and six switching elements connected to the three-phase armature winding in a three-phase bridge in each of the first system and the second system. In this case, in the first system and the second system, by closing three switching elements on the high voltage side and opening three switching elements on the low voltage side among the six switching elements, a closed circuit is formed in each system. can do. Thereby, a braking torque can be given to an engine in each system | strain, and the thermal load per system (thermal load concerning each switching element) can be reduced. Further, in the first system and the second system, when the three switching elements on the high voltage side among the six switching elements are opened and the three switching elements on the low voltage side are closed, the same effect can be obtained. it can.

  In a twelfth aspect based on any one of the first to fifth aspects, the rotating electrical machine module includes a three-phase armature winding and six switching elements connected to the three-phase armature winding by a three-phase bridge. And when forming the closed circuit, among the six switching elements, a first state in which three switching elements on the high voltage side are closed and three switching elements on the low voltage side are opened, and the high voltage The second state in which the three switching elements on the side are opened and the three switching elements on the low voltage side are closed is alternately switched.

  The rotating electrical machine module includes a three-phase armature winding and six switching elements connected to the three-phase armature winding by a three-phase bridge. In this case, as a first state, a closed circuit can be formed by closing three switching elements on the high voltage side and opening three switching elements on the low voltage side among the six switching elements. As a second state, a closed circuit can be formed by opening three switching elements on the high voltage side and closing three switching elements on the low voltage side among the six switching elements. Then, when forming the closed circuit, the thermal load is distributed to the three switching elements on the high voltage side and the three switching elements on the low voltage side in order to alternately switch between the first state and the second state. Can do.

  In a thirteenth aspect of the present invention based on any one of the first to fifth aspects, the rotating electrical machine module includes a three-phase armature winding and a three-phase armature winding in the first system and the second system, respectively. Three switching elements connected in a three-phase bridge, and when forming the closed circuit, in the first system and the second system, three switching elements on the high voltage side of the six switching elements A first state in which the three switching elements on the low voltage side are closed and the three switching elements on the high voltage side among the six switching elements are opened and the low voltage side is opened in the first system and the second system. The second state in which the three switching elements are closed are alternately switched.

  The rotating electrical machine module includes a three-phase armature winding and six switching elements connected to the three-phase armature winding in a three-phase bridge in each of the first system and the second system. In this case, as the first state, in the first system and the second system, among the six switching elements, the high voltage side three switching elements are closed and the low voltage side three switching elements are opened. Each can form a closed circuit. Further, as the second state, in the first system and the second system, among the six switching elements, by opening the three switching elements on the high voltage side and closing the three switching elements on the low voltage side, A closed circuit can be formed. And, in forming the closed circuit, in order to switch between the first state and the second state alternately, three switching elements on the high voltage side of each system and three switching elements on the low voltage side of each system, Thermal load can be distributed.

  In a fourteenth aspect based on any one of the first to fifth aspects, the rotating electrical machine module includes a three-phase armature winding and a three-phase armature winding in the first system and the second system, respectively. 6 switching elements connected in a three-phase bridge, and when forming the closed circuit, in the first system, the three switching elements on the high voltage side of the six switching elements are closed and the low voltage Open the three switching elements on the side and open the six switching elements in the second system; open the six switching elements in the first system; and Of the switching elements, the third switching element on the high voltage side is closed, and the second state in which the three switching elements on the low voltage side are opened is alternately switched. The features.

  The rotating electrical machine module includes a three-phase armature winding and six switching elements connected to the three-phase armature winding in a three-phase bridge in each of the first system and the second system. In this case, as the first state, in the first system, the high voltage side of the first system is closed by closing the three switching elements on the high voltage side among the six switching elements and opening the three switching elements on the low voltage side. A closed circuit can be formed. Further, as the second state, in the second system, by closing three switching elements on the high voltage side among the six switching elements and opening three switching elements on the low voltage side, on the high voltage side of the second system A closed circuit can be formed. And when forming a closed circuit, in order to switch a 1st state and a 2nd state alternately, three switching elements of the high voltage side of the 1st system and three switching elements of the high voltage side of the 2nd system, In addition, the heat load can be distributed.

  According to a fifteenth aspect of the invention, in any one of the first to fifth aspects of the invention, the rotating electrical machine module includes a three-phase armature winding and a three-phase armature winding in the first system and the second system, respectively. 6 switching elements connected in a three-phase bridge, and when forming the closed circuit, in the first system, the three switching elements on the high voltage side among the six switching elements are opened and the low voltage A first state in which the three switching elements on the side are closed and the six switching elements are opened in the second system, the six switching elements are opened in the first system, and the six switching elements in the second system Of the switching elements, the second state is alternately switched between the three switching elements on the high voltage side and the three switching elements on the low voltage side being closed. And wherein the door.

  In the fifteenth aspect, in accordance with the fourteenth aspect, the thermal load can be distributed to the three switching elements on the low voltage side of the first system and the three switching elements on the low voltage side of the second system. .

  According to a sixteenth aspect of the invention, in any one of the twelfth to fifteenth aspects, when the rotational speed of the engine periodically becomes a maximum value and a minimum value, the rotation speed becomes the minimum value. The first state and the second state are switched.

  When switching between the first state and the second state, for example, if a dead time for preventing a short circuit between the switching element on the high voltage side and the switching element on the low voltage side is provided, a period in which a closed circuit is not formed occurs. . During the period when the closed circuit is not formed, the braking torque cannot be applied to the engine. By the way, the rotational speed of the engine periodically becomes a maximum value and a minimum value. Then, at a time when the rotational speed of the engine becomes a minimum value, the braking torque applied to the engine by the rotating electrical machine becomes relatively small. In this regard, since the first state and the second state are switched at a time when the rotational speed of the engine becomes the minimum value, the first state and the second state are suppressed while suppressing the influence that the braking torque cannot be applied to the engine. Can be switched. Further, even when the first state and the second state are switched at a time when the engine speed becomes zero, the same effect can be obtained.

  In a seventeenth aspect based on any one of the first to fifth aspects, the rotating electrical machine module includes a three-phase armature winding and a three-phase armature winding in the first system and the second system, respectively. 6 switching elements connected in a three-phase bridge, and when forming the closed circuit, in the first system, the three switching elements on the high voltage side of the six switching elements are closed and the low voltage Open the three switching elements on the side and open the six switching elements in the second system; open the six switching elements in the first system; and A second state in which the three switching elements on the high voltage side among the switching elements are closed and the three switching elements on the low voltage side are opened; Among the six switching elements, a third state in which three switching elements on the high voltage side are opened, three switching elements on the low voltage side are closed, and the six switching elements in the second system are opened; A fourth state in which the six switching elements are opened in the system, and in the second system, among the six switching elements, the three switching elements on the high voltage side are opened and the three switching elements on the low voltage side are closed. And switching in a predetermined order.

  In the seventeenth invention, three switching elements on the high voltage side of the first system energized in the first state, three switching elements on the high voltage side of the second system energized in the second state, and in the third state The thermal load can be distributed to the three switching elements on the low voltage side of the first system to be energized and the three switching elements on the low voltage side of the second system to be energized in the fourth state.

It is a schematic block diagram of the control system which concerns on this embodiment. FIG. 2 is a schematic circuit diagram around a rotating electric machine illustrated in FIG. 1. It is the figure which showed the mode which the rotary electric machine which concerns on this embodiment can implement. It is the figure which showed the change mode of the parameter at the time of making a rotary electric machine implement a generator mode when stopping an engine. It is the figure which showed the change mode of the parameter at the time of making a rotary electric machine implement a brake mode when stopping an engine. FIG. 3 is a circuit diagram illustrating control in the case of forming a closed circuit that does not pass through a battery in the circuit diagram illustrated in FIG. 2. It is the figure which showed the effect which the stop control which concerns on this embodiment brings. It is the circuit diagram which showed another example of control in the case of forming the closed circuit of FIG. It is a schematic circuit diagram around a rotating electrical machine according to another example. It is a schematic circuit diagram around a rotating electrical machine according to another example. It is the circuit diagram which showed the control in the case of forming a closed circuit in 2 systems. It is the circuit diagram which showed another example of control in the case of forming a closed circuit in two systems. It is the circuit diagram which showed the control in the case of forming a closed circuit in 1 system among 2 systems. It is the circuit diagram which showed another example of the control in the case of forming a closed circuit in 1 system among 2 systems. It is the circuit diagram which showed another example of the control in the case of forming a closed circuit in 1 system among 2 systems. It is the circuit diagram which showed another example of the control in the case of forming a closed circuit in 1 system among 2 systems.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. The stop control system according to the present embodiment is mounted on a vehicle including an engine 10 as a travel drive source. In FIG. 1, an engine 10 is a multi-cylinder internal combustion engine driven by combustion of fuel such as gasoline or light oil, and includes a fuel injection valve 50, an ignition device, and the like as is well known.

  A rotating electrical machine module 20 is connected to a rotating shaft (not shown) of the engine 10 via a power transmission unit 16 including a pulley and a belt so as to be able to transmit power. The rotating electrical machine module 20 is mainly driven as an electric motor when driving force is supplied to the engine 10, and is driven as a generator when converting the driving force of the engine 10 into electric power.

  The configuration of the rotating electrical machine module 20 will be described with reference to FIG. In the present embodiment, the rotating electrical machine module 20 is assumed to be an ISG (Integrated Starter Generator). The rotating electrical machine module 20 includes a generator motor 21, a drive circuit 25, and a rotating electrical machine control unit 27. The generator motor 21 is connected to a battery (corresponding to a power source) 30 via a drive circuit 25.

  The generator motor 21 is a three-phase AC motor generator, and the generator motor 21 includes a stator 22 including three-phase armature windings 22a to 22c and a field winding 23a. And a rotor 23. The generator motor 21 further includes an adjusting unit (corresponding to a current adjusting unit) 24, and the adjusting unit 24 applies an exciting current to be supplied to the field winding 23 a included in the rotor 23 based on a command from the rotating electrical machine control unit 27. Adjust the size.

  The drive circuit 25 is an inverter circuit including a plurality of MOSFETs (corresponding to first switching elements) that are switching elements. Specifically, the drive circuit 25 includes MOSFETs 25a to 25f. One end of a U-phase armature winding 22a of the stator 22 is connected to a connection point between the MOSFETs 25a and 25b. One end of a V-phase armature winding 22b of the stator 22 is connected to a connection point of the MOSFETs 25c and 25d. One end of a W-phase armature winding 22c of the stator 22 is connected to a connection point between the MOSFETs 25e and 25f. The other end of the armature winding 22a, the other end of the armature winding 22b, and the other end of the armature winding 22c are connected to each other at a neutral point. The drive circuit 25 further includes a switch control unit 26, and the switch control unit 26 controls the opening / closing operations of the MOSFETs 25a to 25f based on a command from the rotating electrical machine control unit 27.

  The rotating electrical machine control unit 27 is assumed to be a rotating electrical machine ECU, and is configured as a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like. The rotating electrical machine control unit 27 causes the adjusting unit 24 to adjust the excitation current flowing through the field winding 23a. Thereby, the generated voltage generated in the rotating electrical machine module 20 is adjusted. In addition, the rotating electrical machine control unit 27 causes the switch control unit 26 to control the opening / closing operation of the MOSFETs 25a to 25f constituting the drive circuit 25.

  Returning to the description of FIG. In this system, an engine ECU 40 is provided as a main control unit that controls the entire system. The engine ECU 40 is a known electronic control device that includes a microcomputer and the like.

  The engine ECU 40 is electrically connected to a rotating electrical machine control unit 27 provided in the rotating electrical machine module 20 (see FIG. 2), and plays a role of controlling the rotating electrical machine module 20 via the rotating electrical machine control unit 27. As illustrated in FIG. 3, the rotating electrical machine module 20 according to the present embodiment has four functions of a standby mode, a generator mode, a motor mode, and a brake mode. When causing the rotating electrical machine module 20 to execute the standby mode, the switch control unit 26 is controlled via the rotating electrical machine control unit 27 so that the MOSFETs 25a to 25f are all opened. When causing the rotating electrical machine module 20 to execute the motor mode, the switch control unit 26 is controlled to open / close the MOSFETs 25a to 25f via the rotating electrical machine control unit 27 so that the DC power supplied from the battery 30 is three-phased. The three-phase power is supplied to the stator 22. Further, when the rotating electrical machine module 20 performs the generator mode, the switch controller 26 controls the opening / closing operation of the MOSFETs 25 a to 25 f via the rotating electrical machine controller 27, thereby causing the induced current generated in the stator 22. Is supplied to the battery 30 and the battery 30 is charged. The brake mode will be described later.

  As the sensors, an accelerator sensor 42 for detecting an operation amount of an accelerator pedal 41 (hereinafter referred to as an accelerator operation amount) serving as an accelerator operation member, and an operation amount of the brake pedal 43 (hereinafter referred to as a brake operation amount) are used. A brake sensor 44 for detecting, a rotation speed sensor 45 for detecting the rotation speed of the rotation shaft of the engine 10, and the like are provided. Detection signals from these sensors are sequentially input to the engine ECU 40. In addition, although the sensor other than these sensors is also provided in this system, illustration is abbreviate | omitted.

  The engine ECU 40 performs control such as control of the fuel injection amount by the fuel injection valve 50 and ignition control by the ignition device based on the detection result of each sensor.

  Further, the engine ECU 40 performs an idling stop control that causes the engine 10 to automatically stop when a predetermined automatic stop condition is satisfied while the vehicle is traveling. The fuel injection valve 50 is in a state where fuel supply to the engine 10 is stopped (hereinafter referred to as fuel cut) (automatic stop process) or the engine 10 is automatically stopped, When the restart condition is satisfied, the engine 10 is automatically restarted. As the automatic stop condition, for example, the vehicle speed is equal to or lower than a predetermined value, the accelerator operation amount detected by the accelerator sensor 42 is zero (or the brake operation amount detected by the brake sensor 44 is greater than the first predetermined amount). Etc.) are included. Further, the engine restart condition includes, for example, that the accelerator operation amount detected by the accelerator sensor 42 is larger than the second predetermined amount, and that the brake operation amount detected by the brake sensor 44 is zero.

  In the conventional idling stop control, as shown in FIG. 4, when the predetermined automatic stop condition is satisfied, the fuel cut is performed and the combustion of the fuel by the engine 10 is stopped. Power generation was performed, and the braking torque of the rotating electrical machine module 20 was applied to the engine 10 (see time t1). In this case, the magnitude of the braking torque of the rotating electrical machine module 20 applied to the engine 10 depends on the magnitude of the induced current flowing through the stator 22. The magnitude of the induced current flowing in the stator 22 depends on the magnitude of the induced electromotive voltage generated in the stator 22, and the magnitude of the induced electromotive voltage generated in the stator 22 is the high rotational speed of the engine 10. Depends on.

  For this reason, when the induced electromotive voltage generated in the stator 22 is smaller than the voltage of the battery 30, the induced current generated in the rotating electrical machine module 20 cannot flow to the battery 30, and the rotating electrical machine module 20 generates power. It cannot be implemented. Therefore, when the rotational speed of the engine 10 is lower than the threshold value as the rotational speed at which the induced electromotive voltage generated in the stator 22 is smaller than the voltage of the battery 30, the rotating electrical machine module 20 is made to execute the standby mode ( Time t2). Thereby, after the rotational speed of the engine 10 becomes lower than the threshold value, the braking torque of the rotating electrical machine module 20 cannot be applied to the engine 10 (see time t2-t3), and the engine 10 is completely There is a possibility that the time to stop will be longer.

  As a countermeasure against this, as shown in FIG. 3, a brake mode is provided in the rotating electrical machine module 20 as a function for stopping the engine 10 more quickly. As shown in FIG. 5, this brake mode is executed when fuel cut is performed and fuel combustion by the engine 10 is stopped when a predetermined automatic stop condition is satisfied (see time t10). .

  When causing the rotating electrical machine module 20 to execute the brake mode, as shown in FIG. 6, the MOSFETs 25a, 25c, and 25e (upper arm MOSFETs) are controlled to be closed, and the MOSFETs 25b, 25d, and 25f (lower arm MOSFETs) are controlled. ) To the open state, all phases of the stator 22 are short-circuited. As a result, a closed circuit in which the induced current generated in the stator 22 flows without passing through the battery 30 is formed in the drive circuit 25. By carrying out power generation by the rotating electrical machine module 20 in this state, the induced current generated in the stator 22 by power generation flows in the closed circuit. Therefore, the magnitude of the braking torque of the rotating electrical machine module 20 applied to the engine 10 when the rotating electrical machine module 20 performs the brake mode depends on the magnitude of the induced current flowing through the stator 22 in the closed circuit. Become. Therefore, the magnitude of the braking torque applied to the engine 10 (see FIG. 5) when the rotating electrical machine module 20 performs the brake mode is the same as that of the engine 10 when the rotating electrical machine module 20 is performed in the generator mode. Is larger than the magnitude of the braking torque applied to (see FIG. 4).

  However, when the rotating electrical machine module 20 is caused to execute the brake mode in a state where the rotational speed of the engine 10 is high, the induced current flowing from the stator 22 to the closed circuit becomes excessively large, and accordingly, the rotating electrical machine applied to the engine 10 is increased. There is a possibility that the braking torque of the module 20 becomes excessively large. In this case, it is conceivable that so-called “belt squealing” occurs in which abnormal noise is generated from the belt constituting the power transmission unit 16. As a countermeasure, during the period when the closed circuit is formed, the exciting current that flows through the field winding 23a of the rotor 23 provided in the rotor 23 is adjusted so that the braking torque applied to the engine 10 does not become larger than the predetermined torque. Adjust the size. Thereby, the magnitude of the braking torque applied to the engine 10 can be adjusted to be smaller than the predetermined torque, and occurrence of problems such as “belt squealing” can be suppressed.

  On the other hand, as shown in FIG. 5, even when the rotational speed of the engine 10 is lower than the threshold value, the braking torque of the rotating electrical machine module 20 can be applied to the engine 10 (see time t11-t14). ). At this time, even when the engine 10 reversely rotates at the time of swinging that occurs when the engine 10 stops, the braking torque of the rotating electrical machine module 20 can be applied to the engine 10 (see time t12-t13).

  With this configuration, the present embodiment has the following effects.

  Induction generated in the stator 22 by causing the rotating electrical machine module 20 to execute the brake mode when the fuel cut is performed due to the establishment of the predetermined automatic stop condition and the combustion of the fuel by the engine 10 is stopped. A closed circuit in which current flows without passing through the battery 30 is formed. As a result, even if the rotational speed of the engine 10 decreases and the magnitude of the induced electromotive voltage generated in the stator 22 becomes smaller than the voltage of the battery 30, the induced current generated in the rotating electrical machine module 20 is formed as a closed circuit. Therefore, the rotating electrical machine module 20 can give a braking torque to the engine 10. That is, since it becomes possible to apply a braking torque to the engine 10 to a region where the rotational speed of the engine 10 is lower, the engine 10 can be stopped quickly.

  Actually, when a predetermined automatic stop condition is satisfied, fuel cut is performed, and when the combustion of fuel by the engine 10 is stopped, the result when the rotating electrical machine module 20 is executed in the brake mode is shown in FIG. It is shown. FIG. 7 shows how the rotational speed of the engine 10 changes when the generator mode is implemented in the rotating electrical machine module 20 when the combustion of fuel by the engine 10 is stopped, and the brake mode is implemented in the rotating electrical machine module 20. FIG. 4 shows how the rotational speed of the engine 10 changes when the engine 10 is operated. According to FIG. 7, the degree of decrease in the rotational speed of the engine 10 is greater when the rotating electrical machine module 20 is in the brake mode than when the rotating electrical machine module 20 is in the generator mode. It can be seen that the braking torque applied to the engine 10 is greater when the rotating electrical machine module 20 is in the brake mode. Further, it can be seen that when the rotating electrical machine module 20 is in the brake mode, the swingback generated when the engine 10 stops can be kept small and can be accommodated earlier. This suggests that when the rotating electrical machine module 20 performs the brake mode, braking torque is applied even when the engine 10 rotates in the reverse direction. Due to the above factors, the engine 10 can be stopped earlier when the rotating electrical machine module 20 is in the brake mode than when the rotating electrical machine module 20 is in the generator mode.

  On the other hand, the restart timing of the engine 10 can be advanced with the rapid stop of the engine 10. Therefore, the restartability of the engine 10 can be improved.

  When a conventional rotating electrical machine module applies a braking force to the engine 10, it detects the rotational angle of the rotor and energizes the appropriate phase of the stator armature winding according to the rotational angle of the rotor. There is a need to. In particular, when reverse rotation of the engine 10 is included, it is necessary to reverse the direction of applying torque at the moment of reverse rotation and complicated control is required. In this embodiment, similar effects can be obtained with simpler control. Is possible.

  By opening and closing the MOSFETs 25 a to 25 f so that all phases of the stator 22 are short-circuited, a closed circuit in which the induced current generated in the stator 22 flows without passing through the battery 30 can be formed.

  -The fluctuation of the braking torque applied to the engine 10 can be reduced by opening and closing the MOSFETs 25a to 25f so that all phases of the rotating electrical machine module 20 are short-circuited.

  It is not limited to the description content of the said embodiment, You may change and implement within the range which does not deviate from the meaning of this invention. For example, you may change as follows. Incidentally, the configuration of another example below may be applied individually or in combination to the configuration of the above embodiment.

  In the above embodiment, the drive circuit 25 includes the MOSFETs 25a to 25f. In this regard, an IGBT, a power transistor, a thyristor, a triac, or the like may be used instead of the MOSFET.

  In the above embodiment, the generator motor 21 is a three-phase AC motor generator. In this regard, not only a three-phase AC motor generator, but also a single-phase AC motor generator or a multi-phase AC motor generator may be used.

  In the above embodiment, the rotor 23 includes the field winding 23a. In this regard, the rotor 23 may include a field permanent magnet instead of the field winding 23a. In this case, the generator motor 21 is an embedded magnet synchronous machine (IPMSM), a surface magnet synchronous machine (SPMSM), or the like.

  In the above embodiment, idling stop control is performed when a predetermined automatic stop condition is satisfied while the vehicle is running, and when the combustion of fuel by the engine 10 is stopped, the rotating electrical machine module 20 is caused to execute the brake mode. It was. In this regard, it is not necessary to cause the rotating electrical machine module 20 to execute the brake mode only when the idling stop control is performed. When the automatic stop control other than the idling stop control is performed, the braking mode is performed on the rotating electrical machine module 20. You may let them. As an example of the automatic stop control other than the idling stop control, there is one that automatically stops the engine 10 when the accelerator operation amount becomes 0 regardless of the vehicle speed. Alternatively, the condition for causing the rotating electrical machine module 20 to execute the brake mode need not be limited to the execution of the automatic stop control. For example, when the driver instructs the engine 10 to stop by performing a key-off operation, the rotating electrical machine module 20 The brake mode may be executed.

  In the above embodiment, the closed circuit in which the induced current generated in the stator 22 flows without passing through the battery 30 is formed in the drive circuit 25 by short-circuiting all phases of the stator 22. In this regard, for example, the MOSFETs 25c and 25e are closed and the other MOSFETs 25a, 25b, 25d, and 25f are opened, so that the V phase and the W phase among the phases of the stator 22 are short-circuited. As a result, a closed circuit in which the induced current generated in the stator 22 flows without passing through the battery 30 may be formed.

  In the above embodiment, all the phases of the stator 22 are short-circuited by controlling the upper arm MOSFETs 25a, 25c, and 25e to all closed states and controlling the lower arm MOSFETs 25b, 25d, and 25f to all open states. I was letting. In this regard, as shown in FIG. 8, the upper arm MOSFETs 25a, 25c, and 25e are all controlled to be opened, and the lower arm MOSFETs 25b, 25d, and 25f are all controlled to be closed. You may short-circuit all the phases which 22 has.

  6 and 8, the rotating electrical machine module 20 includes armature windings 22a, 22b, and 22c (three-phase armature windings) and MOSFETs 25a to 25c connected to the armature windings 22a, 22b, and 22c in a three-phase bridge. 25f (switching element). Here, as shown in FIG. 6, as the first state, among the MOSFETs 25a to 25f, the upper arm MOSFETs 25a, 25c and 25e (three switching elements on the high voltage side) are closed, and the lower arm MOSFETs 25b, 25d, A closed circuit can be formed by opening 25f (three switching elements on the low voltage side). As shown in FIG. 8, as the second state, among the MOSFETs 25a to 25f, the upper arm MOSFETs 25a, 25c, and 25e are opened, and the lower arm MOSFETs 25b, 25d, and 25f are closed to form a closed circuit. be able to. And when forming a closed circuit, you may switch a 1st state and a 2nd state alternately. Thereby, a thermal load can be distributed to the MOSFETs 25a, 25c, and 25e and the MOSFETs 25b, 25d, and 25f.

  In FIG. 11, the rotating electrical machine module 20 includes armature windings 22a, 22b, and 22c (three) in the drive circuit 25A and the stator 22A (first system) and in the drive circuit 25B and the stator 22B (second system), respectively. Phase armature winding) and MOSFETs 25a to 25f connected to the armature windings 22a, 22b, and 22c in a three-phase bridge. In this case, in the first system and the second system, among the MOSFETs 25a to 25f, the upper arm MOSFETs 25a, 25c, and 25e (three switching elements on the high voltage side) are closed, and the lower arm MOSFETs 25b, 25d, and 25f (low) By opening the three switching elements on the voltage side, a closed circuit can be formed in each system. As a result, braking torque can be applied to the engine 10 in each system, and the thermal load per system (the thermal load applied to each MOSFET 25a to 25f) can be reduced. Further, in the first system and the second system, the same effect can be obtained when the MOSFETs 25a, 25c, 25e of the upper arm among the MOSFETs 25a-25f are opened and the MOSFETs 25b, 25d, 25f of the lower arm are closed. Can do.

  As shown in FIG. 11, as the first state, in the first system and the second system, among the MOSFETs 25a to 25f, the upper arm MOSFETs 25a, 25c, and 25e (three switching elements on the high voltage side) are closed and By opening the side arm MOSFETs 25b, 25d, and 25f (three switching elements on the low voltage side), a closed circuit can be formed in each system. As shown in FIG. 12, as the second state, in the first system and the second system, among the MOSFETs 25a to 25f, the upper arm MOSFETs 25a, 25c, and 25e are opened, and the lower arm MOSFETs 25b, 25d, and 25f are opened. By closing, a closed circuit can be formed in each system. When forming the closed circuit, the thermal load is distributed to the MOSFETs 25a, 25c, 25e of each system and the MOSFETs 25b, 25d, 25f of each system by alternately switching between the first state and the second state. be able to.

  As shown in FIG. 13, as the first state, in the first system (drive circuit 25A and stator 22A), MOSFETs 25a, 25c and 25e (three switching elements on the high voltage side) of the upper arm among MOSFETs 25a to 25f. And the lower arm MOSFETs 25b, 25d, and 25f (three switching elements on the low voltage side) are opened to form a closed circuit on the high voltage side of the first system. At this time, MOSFETs 25a to 25f are opened in the second system (drive circuit 25B and stator 22B). Also, as shown in FIG. 14, in the second system, as the second state, among the MOSFETs 25a to 25f, by closing the upper arm MOSFETs 25a, 25c, and 25e and opening the lower arm MOSFETs 25b, 25d, and 25f, A closed circuit can be formed on the high voltage side of the second system. At this time, the MOSFETs 25a to 25f are opened in the first system. When forming the closed circuit, the first state and the second state are alternately switched, thereby applying a thermal load to the first system MOSFETs 25a, 25c, 25e and the second system MOSFETs 25a, 25c, 25e. Can be dispersed.

  As shown in FIG. 15, as the first state, in the first system (drive circuit 25A and stator 22A), MOSFETs 25a, 25c, and 25e of the upper arm among the MOSFETs 25a to 25f (three switching elements on the high voltage side) Is closed and the lower arm MOSFETs 25b, 25d, and 25f (three switching elements on the low voltage side) are closed, and a closed circuit can be formed on the low voltage side of the first system. At this time, MOSFETs 25a to 25f are opened in the second system (drive circuit 25B and stator 22B). Also, as shown in FIG. 16, in the second state, in the second system, by opening the upper arm MOSFETs 25 a, 25 c, 25 e and closing the lower arm MOSFETs 25 b, 25 d, 25 f in the second system, A closed circuit can be formed on the low voltage side of the second system. At this time, the MOSFETs 25a to 25f are opened in the first system. When forming the closed circuit, the first state and the second state are alternately switched, thereby applying a thermal load to the first system MOSFETs 25b, 25d, and 25f and the second system MOSFETs 25b, 25d, and 25f. Can be dispersed.

  In each of the above examples, when switching between the first state and the second state, for example, the upper arm MOSFETs 25a, 25c, 25e (high voltage side switching elements) and the lower arm MOSFETs 25b, 25d, 25f (low voltage) If a dead time for preventing a short circuit with the switching device on the side is provided, a period in which a closed circuit is not formed occurs. The dead time is a time for which the MOSFETs 25a and 25b are both opened so that the MOSFET 25a and the MOSFET 25b are not short-circuited, for example. During the period when the closed circuit is not formed, the braking torque cannot be applied to the engine 10.

  Incidentally, the rotational speed of the engine 10 periodically becomes a maximum value and a minimum value as shown in FIGS. Then, for example, at a time when the rotational speed of the engine 10 reaches a minimum value as shown at time t11 in FIG. 5, the braking torque applied to the engine 10 by the generator motor 21 (rotating electric machine) is relatively small. In this regard, by switching between the first state and the second state at the time when the rotational speed of the engine 10 becomes the minimum value, the influence that the braking torque cannot be applied to the engine 10 is suppressed, and the first state and the second state are suppressed. You can switch between two states. Further, when the rotational speed of the engine 10 becomes zero, the braking torque applied to the engine 10 by the generator motor 21 is the smallest. For this reason, even if it switches between a 1st state and a 2nd state at the time when the rotational speed of the engine 10 becomes 0, the same effect can be show | played.

  -When forming a closed circuit, you may switch each state (1st-4th state) shown to FIGS. 13-16 in a predetermined order. The predetermined order is arbitrary, but it is necessary to provide a dead time if the order does not include switching between the state of FIG. 13 and the state of FIG. 15 and switching between the state of FIG. 14 and the state of FIG. In addition, the braking torque can be efficiently applied to the engine 10 by the generator motor 21. According to the above control, MOSFETs 25a, 25c, 25e of the first system (drive circuit 25A and stator 22A), MOSFETs 25a, 25c, 25e of the second system (drive circuit 25B and stator 22B), The thermal load can be distributed to the MOSFETs 25b, 25d, and 25f and the second system MOSFETs 25b, 25d, and 25f.

  In the above embodiment, when the predetermined automatic stop condition is satisfied, the fuel cut is performed, and when the combustion of the fuel by the engine 10 is stopped, the rotating electrical machine module 20 is caused to execute the brake mode. In this regard, when the predetermined automatic stop condition is satisfied, the fuel cut is performed, and after the combustion of the fuel by the engine 10 is stopped, the rotational speed of the engine 10 is higher than the predetermined rotational speed. When the generator mode is implemented in the module 20 and the rotational speed of the engine 10 is lower than the predetermined rotational speed, the rotating electrical machine module 20 may be implemented in the brake mode. The predetermined rotation speed is set to a rotation speed higher than the threshold value shown in FIGS.

  When the rotating electrical machine module 20 is charged without forming a closed circuit, the magnitude of the braking torque applied to the engine 10 depends on the magnitude of the induced current flowing through the stator 22. In a situation where the rotational speed of the engine 10 is higher than the predetermined rotational speed, it is considered that the braking torque applied to the engine 10 is sufficiently large even when the battery 30 is charged with the electric power supplied by the stator 22. For this reason, when the rotational speed of the engine 10 is higher than the predetermined rotational speed, it is possible to apply the braking torque to the engine 10 and charge the battery 30 by causing the rotating electrical machine module 20 to execute the generator mode. It becomes.

  On the other hand, in a situation where the rotational speed of the engine 10 is lower than the predetermined rotational speed, the induced electromotive voltage generated in the stator 22 by power generation is also small, and a sufficient induced current cannot flow through the stator 22, and the rotating electrical machine module It is conceivable that 20 cannot apply braking torque to the engine 10. Alternatively, even if the rotating electrical machine module 20 can apply the braking torque to the engine 10, the magnitude is considered to be minute. Therefore, when the rotational speed of the engine 10 is lower than the predetermined rotational speed, the rotating electrical machine module 20 is caused to execute the brake mode. Thereby, the induced current generated in the stator 22 is not reduced, and as a result, it is possible to suppress the braking torque applied to the engine 10 by the rotating electrical machine module 20 from becoming smaller.

  [1] In the above embodiment, the field winding 23a provided in the rotor 23 of the adjusting unit 24 is provided so that the braking torque applied to the engine 10 does not become larger than the predetermined torque during the period in which the closed circuit is formed. The magnitude of the exciting current to flow was adjusted. With respect to this, during the period in which the closed circuit is formed, the time of the closing operation with respect to the cycle of the opening / closing operation is determined for each of the MOSFETs 25a, 25c, and 25e so that the braking torque applied to the engine 10 does not become larger than the predetermined torque. The ratio (duty ratio) is adjusted. As a result, the magnitude of the induced current generated in the stator 22 can be limited, and as a result, the braking torque applied to the engine 10 can be suppressed from becoming larger than the predetermined torque. Moreover, overheating of the MOSFETs 25a, 25c, and 25e can be suppressed by suppressing an excessively large induced current from flowing through the MOSFETs 25a, 25c, and 25e.

  The control for preventing the braking torque to be applied to the engine 10 from becoming larger than the predetermined torque does not need to be carried out independently in the above embodiment and another example described in [1], and is executed in combination. Also good.

  In the above embodiment, the stator 22 includes the three-phase armature windings 22a to 22c, and the rotor 23 includes the field winding 23a. In this regard, the stator 22 may be configured to include a field winding, and the rotor 23 may be configured to include a three-phase armature winding. In this case, during the period when the closed circuit is formed, the magnitude of the induced current flowing through the three-phase armature winding provided in the rotor 23 is such that the braking torque applied to the engine 10 does not become larger than the predetermined torque. Limited. In addition, since the specific method is based on the method described in [1], description is abbreviate | omitted.

  The control for preventing the braking torque to be applied to the engine 10 from becoming larger than the predetermined torque may be omitted. That is, the magnitude of the excitation current flowing through the field winding 23a and the duty ratio of the closing operation of the MOSFETs 25a, 25c, and 25e may be adjusted so that the braking torque applied to the engine 10 is maximized.

  [2] In the above embodiment, the rotating electrical machine module 20 is assumed to be ISG. About this, it is not necessary to restrict to ISG, The alternator 60 which is a generator may be sufficient. A configuration in the case of the alternator 60 is shown in FIG. In this example, the rectifier circuit 61 is a three-phase full-wave rectifier including a diode. A second switching element 62 such as a MOSFET that opens and closes between the battery 30 and the rectifier circuit 61 is provided. A connection path 63 that bypasses the battery 30 and connects the positive electrode side and the negative electrode side of the rectifier circuit 61 is branched between the second switching element 62 and the rectifier circuit 61. A third switching element 64 for opening and closing the connection path 63 is provided. In the stop control system according to this example, the switch control unit 65 performs opening / closing control of the second switching element 62 and the third switching element 64 based on a command from the engine ECU 66.

  In the stop control system according to this alternative example, the closed circuit in which the induced current generated in the stator 67 provided in the rotating electrical machine 60 flows through the connection path 63 without passing through the battery 30 by closing the third switching element 64. Can be formed. However, in this state, the current flowing from the battery 30 also flows through the connection path 63. In order to prevent this, when the closed circuit is formed by closing the third switching element 64, the second switching element 62 is opened. Thereby, the inflow of the current from the battery 30 to the connection path 63 can be blocked. Even with this configuration, the same operations and effects as in the above-described embodiment can be achieved.

  In another example according to [2], the rectifier circuit 61, the connection path 63, and the rotor 68 provided in the rotating electrical machine 60 are connected in parallel to the battery 30. In this circuit, when the third switching element 64 is closed, a closed circuit is formed and when the second switching element 62 is opened, the voltage applied to the field winding 68a of the rotor 68 is reduced. The magnitude and the magnitude of the voltage applied to the connection path 63 are the same. At this time, since only the third switching element 64 is provided in the connection path 63, a sufficient voltage cannot be applied to the field winding 68a, and a sufficient current may not flow through the field winding 68a. As a result, the rotor 68 may not be magnetized.

  As a countermeasure against this, as shown in FIG. 10, a resistor 70 is provided on the negative side of the third switching element 64 in the connection path 63. In the connection path 63, the resistor 70 may be provided on the positive electrode side with respect to the third switching element 64. At this time, if the resistance value of the resistor 70 is large, the voltage applied to the resistor 70 increases (Ohm's law), so the voltage applied to the field winding 68a also increases, and the rotor 68 is It can be magnetized. However, if the resistance value of the resistor 70 is excessively increased, the induced current flowing from the stator 22 to the resistor 70 is decreased (Ohm's law), and the braking torque applied to the engine 10 is considered to be decreased. Therefore, when the closed circuit is formed, the resistance value of the resistor 70 is adjusted so that the voltage applied to the field winding 68 a is lower than the voltage of the battery 30. As a result, it becomes possible to apply a larger braking torque to the engine 10 and to magnetize the rotor 68 than when the rotating electrical machine module 20 is in the generator mode.

  In the above embodiment, the rotating electrical machine module 20 is assumed to be ISG. In this regard, the rotating electrical machine module 20 is not limited to the ISG, and may be provided between the rotating shaft of the engine 10 and the transmission, and may be directly driven by the rotating shaft or directly drive the rotating shaft. Further, the alternator 60 according to another example described in [2] may be an alternator in which the rectifier circuit 61 is configured like the drive circuit 25.

  DESCRIPTION OF SYMBOLS 10 ... Engine, 20 ... Rotary electric machine module, 21 ... Generator motor, 30 ... Battery, 60 ... Alternator.

Claims (17)

Supplyed by the rotating electrical machine module (20, 60) having an engine (10) that generates a driving force by combustion of fuel, a rotating electrical machine (21, 69) that can generate electric power by the driving force of the engine, and the rotating electrical machine module And a power supply (30) charged by the generated power, and a stop control system for executing control to stop the engine,
A stop control system that forms a closed circuit in which an induced current generated in the rotating electrical machine flows without passing through the power source after combustion of the fuel by the engine is stopped. The rotating electric machine is
Field windings (23a, 68a);
A current adjusting unit (24) for adjusting the magnitude of the current flowing in the field winding;
With
The current adjustment unit adjusts the magnitude of the current flowing through the field winding so that a braking torque applied to the engine does not become larger than a predetermined torque during a period in which the closed circuit is formed. The stop control system according to 1. The rotating electrical machine (21)
Armature windings (22a, 22b, 22c);
An induced current adjusting unit (26) for adjusting the average current magnitude of the induced current flowing through the armature winding;
With
The induced current adjusting unit is configured to increase the average current of the induced current that flows through the armature winding so that a braking torque applied to the engine does not become larger than a predetermined torque during a period in which the closed circuit is formed. The stop control system according to claim 1 or 2, which adjusts the height.   After the combustion of the fuel by the engine is stopped, when the rotational speed of the engine is higher than a predetermined rotational speed, power is generated by the rotating electrical machine, and the rotational speed of the engine is lower than the predetermined rotational speed The stop control system according to claim 1, wherein the closed circuit is formed. When a predetermined automatic stop condition is satisfied, it is applied to a vehicle having an automatic stop function for automatically stopping the engine,
The stop control system according to any one of claims 1 to 4, wherein the closed circuit is formed after the automatic stop condition is satisfied and combustion of the fuel by the engine is stopped. The rotating electrical machine module is a multiphase rotating electrical machine (20),
A plurality of first switching elements (25a to 25f) capable of opening and closing so that at least some of the phases of the multiphase rotating electrical machine are short-circuited;
The closed circuit is formed by opening and closing the first switching element so that at least some of the phases of the multiphase rotating electrical machine are short-circuited. The stop control system according to item 1.   The stop control system according to claim 6, wherein the duty ratio of the first switching element is adjusted so that a braking torque applied to the engine does not become larger than a predetermined torque during a period in which the closed circuit is formed.   The stop control system according to claim 6 or 7, wherein after the combustion of the fuel by the engine is stopped, the plurality of first switching elements are opened and closed so that all phases of the multiphase rotating electrical machine are short-circuited. The rotating electrical machine module (60) is an alternator,
A rectifier (61) for rectifying the induced current generated by power generation;
A stop control system configured such that the induced current rectified by the rectification unit flows to the power source,
A second switching element (62) for opening and closing between the power source and the rectifying unit;
Between the second switching element and the rectifier unit, a connection path (63) that bypasses the power source and connects the positive electrode side and the negative electrode side of the rectifier unit;
With
The connection path includes a third switching element (64) for opening and closing the connection path,
The stop control according to any one of claims 1 to 5, wherein the closed circuit is formed by closing the third switching element, and the second switching element is opened when the closed circuit is formed. system. The rectifying unit, the connection path, and the field winding of the alternator are connected in parallel to the power source,
The stop control system according to claim 9, wherein the connection path includes a resistor (70). The rotating electrical machine module is respectively in the first system and the second system,
Three-phase armature windings (22a, 22b, 22c);
Six switching elements (25a-25f) connected in a three-phase bridge to the three-phase armature winding;
With
When forming the closed circuit, in the first system and the second system, the three switching elements (25a, 25c, 25e) on the high voltage side among the six switching elements are closed and the three on the low voltage side are closed. Open two switching elements (25b, 25d, 25f) or, in the first system and the second system, open three switching elements on the high voltage side of the six switching elements and three on the low voltage side The stop control system according to any one of claims 1 to 5, wherein the switching element is closed. The rotating electrical machine module is
Three-phase armature windings (22a, 22b, 22c);
Six switching elements (25a-25f) connected in a three-phase bridge to the three-phase armature winding;
With
When forming the closed circuit, among the six switching elements, the three switching elements (25a, 25c, 25e) on the high voltage side are closed and the three switching elements (25b, 25d, 25f) on the low voltage side are closed. 6. The first state of opening and the second state of opening the three switching elements on the high voltage side and closing the three switching elements on the low voltage side are switched alternately. Stop control system. The rotating electrical machine module is respectively in the first system and the second system,
Three-phase armature windings (22a, 22b, 22c);
Six switching elements (25a-25f) connected in a three-phase bridge to the three-phase armature winding;
With
When forming the closed circuit, in the first system and the second system, the three switching elements (25a, 25c, 25e) on the high voltage side among the six switching elements are closed and the three on the low voltage side are closed. Two switching elements (25b, 25d, 25f), and in the first system and the second system, among the six switching elements, three switching elements on the high voltage side are opened and the low voltage side is opened. The stop control system according to any one of claims 1 to 5, wherein a second state in which the three switching elements are closed is alternately switched. The rotating electrical machine module is respectively in the first system and the second system,
Three-phase armature windings (22a, 22b, 22c);
Six switching elements (25a-25f) connected in a three-phase bridge to the three-phase armature winding;
With
In forming the closed circuit, in the first system, among the six switching elements, three switching elements (25a, 25c, 25e) on the high voltage side are closed and three switching elements (25b) on the low voltage side are closed. , 25d, 25f) and opening the six switching elements in the second system, opening the six switching elements in the first system, and opening the six switching elements in the second system 2. The second state in which the three switching elements (25 a, 25 c, 25 e) on the high voltage side among the elements are closed and the three switching elements (25 b, 25 d, 25 f) on the low voltage side are opened alternately is switched. The stop control system according to any one of 1 to 5. The rotating electrical machine module is respectively in the first system and the second system,
Three-phase armature windings (22a, 22b, 22c);
Six switching elements (25a-25f) connected in a three-phase bridge to the three-phase armature winding;
With
When the closed circuit is formed, in the first system, among the six switching elements, three switching elements (25a, 25c, 25e) on the high voltage side are opened and three switching elements (25b) on the low voltage side are opened. , 25d, 25f) and opening the six switching elements in the second system, opening the six switching elements in the first system, and opening the six switching elements in the second system 2. The second state in which three switching elements (25 a, 25 c, 25 e) on the high voltage side among the elements are opened and the three switching elements (25 b, 25 d, 25 f) on the low voltage side are closed are alternately switched. The stop control system according to any one of 1 to 5.   16. The switch between the first state and the second state at a time when the rotational speed becomes the minimum value when the rotational speed of the engine periodically becomes a maximum value and a minimum value. The stop control system according to claim 1. The rotating electrical machine module is respectively in the first system and the second system,
Three-phase armature windings (22a, 22b, 22c);
Six switching elements (25a-25f) connected in a three-phase bridge to the three-phase armature winding;
With
In forming the closed circuit, in the first system, among the six switching elements, three switching elements (25a, 25c, 25e) on the high voltage side are closed and three switching elements (25b) on the low voltage side are closed. , 25d, 25f) and opening the six switching elements in the second system, opening the six switching elements in the first system, and opening the six switching elements in the second system A second state in which the three switching elements (25a, 25c, 25e) on the high voltage side among the elements are closed and the three switching elements (25b, 25d, 25f) on the low voltage side are opened; Among the six switching elements, three switching elements on the high voltage side are opened and three switching elements on the low voltage side are opened. A third state of closing and opening the six switching elements in the second system; and opening the six switching elements in the first system; and in the second system, the higher voltage side of the six switching elements. The stop control system according to any one of claims 1 to 5, wherein the third state is switched in a predetermined order to the fourth state in which the three switching elements are opened and the three switching elements on the low voltage side are closed.

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