JP2018122826A - Rotary electric machine unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine unit that is able to restrain an operation so as to prevent both an element temperature and a device temperature from increasing beyond corresponding set-temperatures.SOLUTION: A rotary electric machine unit comprises: a rotary electric machine 21; a plurality of switching elements Sp, Sn for electrically conducting or cutting off the rotary electric machine for each phase; a control device 23 that controls an operation of the rotary electric machine by controlling the plurality of switching elements; a first temperature detecting section that detects a temperature of each switching element as an element temperature; and a second temperature detecting section 29 that detects a temperature of the control device as a device temperature. The control device controls the switching elements so as to prevent the element temperature detected by the first temperature detecting section from becoming higher than an element set-temperature, which is set for each switching element and so as to prevent the device temperature detected by the second temperature detecting section from becoming higher than a device set-temperature, set for the control device.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rotating electrical machine unit.

  Conventionally, a rotating electrical machine incorporating an inverter is known. In a vehicle equipped with this rotating electrical machine, it is assumed that idling stop control is performed in which the engine is automatically restarted when a predetermined restart condition is satisfied while the engine is automatically stopped. In this case, due to the power generation operation of the rotating electrical machine that occurs immediately after the engine is started, a large current flows through the switching element provided in the inverter, and the temperature of the switching element may exceed the allowable level.

  As a countermeasure, the AC generator motor device described in Patent Document 1 includes a temperature detection circuit, and the temperature of a PN junction diode provided in a partial region of a semiconductor circuit (switching element) provided in an inverter, that is, a semiconductor. The temperature of the circuit is detected. The highest temperature among the temperatures of the plurality of semiconductor circuits detected by the temperature detection circuit is set as the inverter temperature, and before the idling stop control is performed, it is determined whether the inverter temperature is equal to or lower than the threshold temperature. Is done. If the inverter temperature exceeds the threshold temperature, the engine automatic stop operation is prohibited. As a result, it is possible to prevent the semiconductor circuit from entering an unacceptable high temperature state when the engine is restarted.

JP 2004-156589 A

  By the way, as the rotating electrical machine, there is known an electromechanical integrated rotating electrical machine that is integrally provided with a control device that controls the rotating electrical machine, in addition to an inverter. In such an electromechanically integrated rotating electrical machine, when the rotating electrical machine operates, the temperature of the control device rises due to heat received from a stator winding provided in the rotating electrical machine or a switching element provided in the inverter. At this time, when the heat capacity of the control device is higher than the heat capacity of the switching element provided in the inverter, the temperature of the control device is less likely to rise but less likely to fall than the switching element. Therefore, even if the technology described in Patent Document 1 is implemented, the temperature of the controller that has risen due to the automatic stop and automatic restart of the engine cannot be lowered sufficiently, and as a result, the idling stop control can be performed. Each time it is implemented, the temperature of the control device will gradually increase, possibly resulting in an unacceptably high temperature state.

  The present invention has been made to solve the above-mentioned problems, and its main purpose is to suppress the operation so that neither the element temperature nor the device temperature becomes higher than the corresponding set temperature. An object of the present invention is to provide a rotating electrical machine unit that can be used.

  According to a first aspect of the present invention, there is provided a rotating electrical machine provided to be able to transmit torque to an engine crankshaft, a plurality of switching elements for energizing and shutting off each phase of the rotating electrical machine, and controlling the plurality of switching elements. Thus, an electro-mechanically integrated rotating electrical machine unit comprising: a control device that controls the operation of the rotating electrical machine; and a first temperature detection unit that detects the temperature of the switching element as an element temperature. A second temperature detection unit configured to detect a temperature as a device temperature, wherein the control device has the element temperature detected by the first temperature detection unit higher than an element set temperature set for the switching element; And the device temperature detected by the second temperature detecting unit is higher than the device set temperature set for the control device. So as to suppress the door, it controls the switching element.

  In an electro-mechanical integrated rotating electrical machine unit in which a control device and a rotating electrical machine are integrally provided, when the rotating electrical machine or the switching element generates heat, the control device receives heat and the temperature of the control device rises. At this time, when the switching element is controlled so that the element temperature, which is the temperature of the switching element, does not become higher than the element setting temperature, it is possible to suppress the element temperature of the switching element from becoming higher than the element setting temperature. There is a possibility that the apparatus temperature of the apparatus becomes higher than the apparatus set temperature.

  As a countermeasure against this, a second temperature detection unit for detecting the device temperature of the control device is provided, the element temperature detected by the first temperature detection unit is suppressed from becoming higher than the element set temperature, and the device temperature is The switching element is controlled so as to prevent the temperature from becoming higher than the device set temperature. Thereby, it can suppress that element temperature and apparatus temperature become higher than the corresponding preset temperature.

  According to a second aspect, in the first aspect, the control device is configured to start from the reference temperature with respect to the element set temperature and a range from the reference temperature set lower than the device set temperature to the element set temperature. Among the element ratio as a ratio occupied by the range from the element temperature and the apparatus ratio as a ratio occupied by the range from the reference temperature to the apparatus temperature with respect to the range from the reference temperature to the apparatus set temperature. The switching element is controlled based on a target ratio that is a higher value.

  By calculating the element ratio and the apparatus ratio, it is possible to grasp how close the current element temperature and the apparatus temperature are to the corresponding set temperatures based on the ratio. In other words, the relationship between the element temperature and the element set temperature and the relationship between the apparatus temperature and the apparatus set temperature can be normalized by a ratio. Therefore, by comparing the calculated element ratio and the apparatus ratio, it is possible to easily determine which of the element temperature and the apparatus temperature is closer to the set temperature. As a result, it is possible to control the temperature of both the element temperature and the apparatus temperature to be suppressed from being higher than the corresponding set temperature by temperature control based on the target ratio. That is, the temperature control by the control device can be simplified.

  In a third aspect based on the second aspect, the control device controls the switching element based on the target ratio on the condition that the target ratio is higher than a common predetermined ratio.

  By setting it as the said structure, the temperature control only in the condition where the object ratio became higher than the common predetermined ratio can be implemented.

  According to a fourth aspect of the present invention, in the second or third aspect of the invention, the rotating electrical machine has a power generation function for generating power by rotating the crankshaft of the engine, and the control device is configured to perform the power generation by the rotating electrical machine. The amount of power generated by the rotating electrical machine is less than the amount of power generated immediately before the target rate becomes higher than the predetermined rate on the condition that the target rate becomes higher than a common predetermined rate during the period The switching element is controlled so that

  By controlling the switching element so that the amount of power generated by the rotating electrical machine is reduced, the amount of heat generated by the switching element and the rotating electrical machine is reduced. Therefore, during the period in which power generation is performed by the rotating electrical machine, the switching element is controlled so that the amount of power generated by the rotating electrical machine is reduced on condition that the target ratio is higher than the predetermined ratio. As a result, it is possible to continue the power generation by the rotating electrical machine while reducing the amount of temperature increase per unit time of the switching element and the control device.

  In a fifth aspect based on any one of the second to fourth aspects, the rotating electrical machine has a torque imparting function for imparting rotational torque to the crankshaft of the engine, and the control device includes the rotating electrical machine. When the rotational torque is applied to the crankshaft, the rotating electrical machine applies the rotational torque to the crankshaft on condition that the target ratio is higher than a common predetermined ratio. The switching element is controlled to stop.

  If the target ratio becomes higher than the predetermined ratio during the period in which the rotational torque is applied to the crankshaft by the rotating electrical machine, temporarily increase the target ratio per unit time. Therefore, it is assumed that the switching element is controlled so that the rotational torque applied to the crankshaft by the rotating electrical machine becomes small. In this case, the rotating electrical machine can apply the rotational torque to the crankshaft even after the target ratio becomes higher than the predetermined ratio. There is a concern that the rotational torque that is generated cannot be satisfied. In this case, it is necessary to carry out control in which the engine outputs rotational torque to the crankshaft so as to compensate for the insufficient rotational torque, and torque control may be complicated. In consideration of this, during the period in which rotational torque is applied to the crankshaft by the rotating electrical machine, the application of rotational torque to the crankshaft by the rotating electrical machine stops on condition that the target ratio is higher than the predetermined ratio. In this way, the switching element is controlled. Thereby, after the target ratio becomes higher than the predetermined ratio, the torque application by the rotating electrical machine is stopped, so that the temperature of the switching element and the control device can be prevented from rising. Further, by stopping the torque application by the rotating electrical machine, torque control is performed only by the output of the engine, and the control can be simplified.

  According to a sixth invention, in any one of the second to fifth inventions, the element set temperature is set as a temperature at which the switching element is assumed to be damaged, and the device set temperature is set when the control device is damaged. Set as an assumed temperature.

  The temperature that is assumed to be damaged differs between the switching element and the control device. Therefore, the switching element and the control device are provided with different set temperatures, so that the temperature of both the switching element and the control device does not become higher than the temperature assumed to be damaged. Can be controlled. Even in this case, it is possible to easily determine which of the element temperature and the apparatus temperature is closer to the set temperature by comparing the calculated element ratio and the apparatus ratio. As a result, it is possible to control the temperature of both the element temperature and the apparatus temperature so as not to become higher than the corresponding set temperature by temperature control based on the target ratio.

  In a seventh aspect based on any one of the second to sixth aspects, the control device transmits the target ratio to an engine control unit that controls the engine.

  According to an eighth aspect of the present invention, there is provided the rotating electrical machine unit (16) according to any one of claims 2 to 7, an engine (42), and a control unit (40) for controlling operations of the engine and the rotating electrical machine unit. And the control unit has an automatic stop / restart function for automatically stopping and restarting the engine, and the rotating electrical machine generates power by rotating the crankshaft of the engine. The vehicle has a function, and the power generation by the rotating electrical machine is performed after the automatic restart is performed by the control unit, wherein the control unit has a target ratio higher than a common predetermined ratio In such a case, the operation of the automatic stop / restart function is prohibited.

  If automatic restart is performed from a state in which the engine is automatically stopped, power generation is performed by the rotating electrical machine after the automatic restart, which may cause a large current to flow through the switching element and a large increase in the element temperature. Further, it is conceivable that the temperature of the control device rises when the rotating electrical machine generates heat during power generation and receives the heat. Therefore, when the target ratio becomes higher than the predetermined ratio, the operation of the automatic stop / restart function is prohibited. Thereby, it can suppress that the temperature of the calculation origin of an object ratio becomes high exceeding the corresponding preset temperature by the electric power generation after an automatic restart of an engine.

It is a schematic block diagram of the vehicle-mounted power supply system which concerns on this embodiment. It is a schematic block diagram of the rotary electric machine unit which concerns on this embodiment. It is a figure explaining the outline | summary of the temperature control which concerns on this embodiment. It is a control flowchart which the rotary electric machine ECU which concerns on this embodiment implements.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings. FIG. 1 embodies an in-vehicle power supply system that supplies electric power to various devices of a vehicle that travels using an engine 42 (internal combustion engine) as a drive source.

  The on-vehicle power supply system shown in FIG. 1 is a dual power supply system having a lead storage battery 11 and a lithium ion storage battery 12. Each storage battery 11, 12 has a starter 13, various electric loads 14, 15, and a rotating electrical machine unit 16. Power supply to is possible. In addition, each of the storage batteries 11 and 12 can be charged by the rotating electrical machine unit 16. In this system, the lead storage battery 11 and the lithium ion storage battery 12 are connected in parallel to the rotating electrical machine unit 16, and the lead storage battery 11 and the lithium ion storage battery 12 are connected in parallel to the electrical loads 14 and 15. .

  The lead storage battery 11 is a well-known general-purpose storage battery. On the other hand, the lithium ion storage battery 12 is a high-density storage battery that has less power loss during charging / discharging than the lead storage battery 11, and has a high output density and energy density. The lithium ion storage battery 12 may be a storage battery having higher energy efficiency during charging / discharging than the lead storage battery 11. Moreover, the lithium ion storage battery 12 is comprised as an assembled battery which has a some single cell, respectively. These storage batteries 11 and 12 have the same rated voltage, for example, 12V.

  Although the detailed description by illustration is omitted, the lithium ion storage battery 12 is housed in a housing case and configured as a battery unit U integrated with a substrate. The battery unit U has two output terminals P1 and P2, among which the lead storage battery 11, the starter 13 and the electric load 14 are connected to the output terminal P1, and the electric load 15 and the rotating electrical machine unit are connected to the output terminal P2. 16 is connected.

  The electric loads 14 and 15 have different requirements for the voltage of the supplied power supplied from the storage batteries 11 and 12. Among these, the electric load 14 includes a constant voltage required load that is required to be stable so that the voltage of the supplied power is constant or at least fluctuates within a predetermined range. On the other hand, the electric load 15 is a general electric load other than the constant voltage required load. It can be said that the electric load 14 is a protected load. In addition, it can be said that the electric load 14 is a load that does not allow a power supply failure, and the electric load 15 is a load that allows a power supply failure compared to the electric load 14.

  Specific examples of the electric load 14 that is a constant voltage required load include various ECUs such as a navigation device, an audio device, a meter device, and an engine ECU. In this case, by suppressing the voltage fluctuation of the supplied power, it is possible to suppress an unnecessary reset or the like in each of the above devices, and to realize a stable operation. The electric load 14 may include a travel system actuator such as an electric steering device or a brake device. Specific examples of the electric load 15 include a seat heater, a heater for a defroster for a rear window, a headlight, a wiper for a front window, and a blower fan for an air conditioner.

  The rotating electrical machine unit 16 includes a rotating electrical machine 21 as a three-phase AC motor, an inverter 22 as a power converter, and a rotating electrical machine ECU 23 that controls the operation of the rotating electrical machine 21. The rotating electrical machine unit 16 is a generator with a motor function, and is configured as an electromechanical integrated ISG (Integrated Starter Generator).

  Here, the electrical configuration of the rotating electrical machine unit 16 will be described with reference to FIG. The rotary electric machine 21 includes U-phase, V-phase, and W-phase windings 24U, 24V, and 24W as three-phase armature windings, and a field winding 25. The rotating shaft of the rotating electrical machine 21 is drivingly connected to the crankshaft 43 of the engine 42 by a belt 44 (see FIG. 1), and the rotating shaft of the rotating electrical machine 21 is rotated by the rotation of the crankshaft 43. The crankshaft 43 is rotated by the rotation of the rotation shaft 21. That is, the rotating electrical machine unit 16 includes a power generation function that generates power (regenerative power generation) by rotating the crankshaft 43 and the axle, and a power running function that applies rotational torque to the crankshaft 43.

  The inverter 22 converts the AC voltage output from each phase winding 24U, 24V, 24W into a DC voltage and outputs it to the battery unit U. The inverter 22 converts the DC voltage input from the battery unit U into an AC voltage and outputs the AC voltage to the phase windings 24U, 24V, and 24W. The inverter 22 is a bridge circuit having the same number of upper and lower arms as the number of phases of the phase winding, and constitutes a three-phase full-wave rectifier circuit. The inverter 22 constitutes a drive circuit that drives the rotating electrical machine 21 by adjusting the electric power supplied to the rotating electrical machine 21.

  The inverter 22 includes an upper arm switch Sp and a lower arm switch Sn for each phase. In the present embodiment, voltage controlled semiconductor switching elements are used as the switches Sp and Sn, and specifically, N-channel MOSFETs are used. An upper arm diode Dp is connected in antiparallel to the upper arm switch Sp, and a lower arm diode Dn is connected in antiparallel to the lower arm switch Sn.

  An intermediate connection point of the series connection body of the switches Sp and Sn in each phase is connected to one end of each phase winding 24U, 24V, and 24W. Further, a voltage sensor 26 that detects the input / output voltage of the inverter 22 is provided between the high-voltage side path and the low-voltage side path of the inverter 22. In addition, the rotating electrical machine unit 16 is provided with a current sensor 27 that detects a current flowing through each phase winding 24U, 24V, 24W, and a current sensor 28 that detects a current flowing through the field winding 25. The current sensor 27 may be provided between the inverter 22 and each phase winding, or may be provided for each phase between the lower arm switch Sn and the ground line. Detection signals from the sensors 26 to 28 are appropriately input to the rotating electrical machine ECU 23. Although not shown, the rotating electrical machine 21 is provided with a rotation angle sensor that detects angle information of the rotor, and the inverter 22 is provided with a signal processing circuit that processes a signal from the rotation angle sensor. Yes.

  The rotating electrical machine ECU 23 is accommodated in the rotating electrical machine unit 16 and installed on the substrate. The rotating electrical machine ECU 23 is configured by a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like.

  The rotating electrical machine ECU 23 adjusts the excitation current flowing through the field winding 25 by an IC regulator (not shown) inside. Thereby, the power generation voltage (output voltage with respect to the battery unit U) of the rotating electrical machine unit 16 is controlled. In addition, the rotating electrical machine ECU 23 controls the switches Sp and Sn in the inverter 22 after the vehicle starts to travel, thereby causing the rotating electrical machine 21 to apply rotational torque to the crankshaft 43. The rotating electrical machine 21 can apply an initial rotation to the crankshaft 43 when the engine is started, and also has a function as an engine starting device. The rotating electrical machine ECU 23 corresponds to a control device.

  Next, the electrical configuration of the battery unit U will be described. As shown in FIG. 1, in the battery unit U, as an in-unit electric path, an electric path L1 that connects the output terminals P1 and P2, and an electric path L2 that connects a point N1 on the electric path L1 and the lithium ion storage battery 12 And are provided. Among these, the switch 31 is provided in the electrical path L1, and the switch 32 is provided in the electrical path L2. In addition, in terms of an electrical path connecting the lead storage battery 11 and the lithium ion storage battery 12, a switch 31 is provided on the lead storage battery 11 side of the connection point N1 to the rotating electrical machine unit 16, and the lithium ion is connected to the connection point N1. A switch 32 is provided on the storage battery 12 side.

  Each of the switches 31 and 32 includes, for example, 2 × n MOSFETs (semiconductor switching elements) and is connected in series so that the parasitic diodes of the pair of MOSFETs are opposite to each other. When the switches 31 and 32 are turned off, the parasitic diode completely cuts off the current flowing through the path where the switches are provided. As the switches 31 and 32, IGBTs or bipolar transistors can be used instead of MOSFETs.

  In the electrical path L1, a voltage sensor 33 is provided on the P1 side of the switch 31, and a voltage sensor 34 is provided on the P2 side of the switch 31. The voltage sensor 33 detects the terminal voltage of the output terminal P1, and the voltage sensor 34 detects the terminal voltage of the output terminal P2.

  The battery unit U includes a battery ECU 37 that controls on / off (opening / closing) of the switches 31 and 32. The battery ECU 37 is constituted by a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like. The battery ECU 37 controls the on / off of the switches 31 and 32 based on the storage state of each of the storage batteries 11 and 12 and the command value from the engine ECU 40 that is the host controller. Thereby, charging / discharging is implemented using the lead storage battery 11 and the lithium ion storage battery 12 selectively. For example, the battery ECU 37 calculates the SOC (remaining capacity: State Of Charge) of the lithium ion storage battery 12, and sets the charge amount and the discharge amount to the lithium ion storage battery 12 so that the SOC is maintained within a predetermined use range. Control.

  The rotating electrical machine ECU 23 of the rotating electrical machine unit 16 and the battery ECU 37 of the battery unit U are connected to an engine ECU (corresponding to a control unit) 40 as a host controller that manages these ECUs 23 and 37 in an integrated manner. The engine ECU 40 is configured by a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like, and controls the operation of the engine 42 based on each engine operation state and vehicle running state.

  These ECUs 23, 37, and 40 are connected to each other by a communication line 41 that constructs a communication network such as CAN, and can communicate with each other, and bidirectional communication is performed at a predetermined cycle. Thereby, the various data memorize | stored in each ECU23,37,40 can mutually be shared.

  By the way, when the rotary electric machine 21, the inverter 22, and the rotary electric machine ECU 23 are integrally provided as in the rotary electric machine unit 16 according to the present embodiment, when the rotary electric machine 21 and the switches Sp and Sn generate heat, The rotating electrical machine ECU 23 receives heat, and the temperature of the rotating electrical machine ECU 23 rises. At this time, the heat capacity of the rotating electrical machine ECU 23 installed on the substrate tends to be larger than the heat capacity of each of the switches Sp and Sn. In this case, the temperature of the rotating electrical machine ECU 23 is higher than that of each of the switches Sp and Sn. It will be difficult to ascend, but difficult to descend.

  When the heat capacity of the rotating electrical machine ECU 23 is larger than the heat capacity of the switches Sp and Sn, the element maximum temperature, which is the highest temperature among the temperatures of the switches Sp and Sn (hereinafter referred to as element temperature), is higher than the element set temperature. It is assumed that each of the switches Sp and Sn is controlled so as to suppress the increase of the height. Even if it is possible to suppress the element maximum temperature from becoming higher than the element set temperature by this control, on the other hand, the unit temperature (corresponding to the apparatus temperature) as the temperature of the rotating electrical machine ECU 23 is changed to the unit set temperature (apparatus). It may be higher than the set temperature). That is, when the temperature control for the element maximum temperature is performed, even if the temperature of each of the switches Sp and Sn is sufficiently decreased by stopping energization of each of the switches Sp and Sn, the unit temperature is sufficiently high. It may not decrease. As a result, each time the temperature control for the element maximum temperature is repeated, the unit temperature may gradually rise and exceed the unit set temperature.

  Alternatively, it is assumed that the rotating electrical machine unit 16 is provided with an electrolytic capacitor (not shown), and the electrolytic capacitor supplies power to the inverter 22. In this case, in a situation where the outside air temperature is low, the capacity of the electrolytic capacitor is reduced, and accordingly, the ripple current is excessively increased. As a result, the element maximum temperature of the inverter 22 greatly increases, and a state may occur in which the element temperature exceeds the element maximum temperature while the unit temperature is lower than the unit set temperature. In the present embodiment, the element set temperature is set as a temperature at which the switches Sp and Sn included in the inverter 22 are assumed to be damaged, and the unit set temperature is set as a temperature at which the rotating electrical machine ECU 23 is assumed to be damaged. That is, the element set temperature and the unit set temperature are often set as different values.

  As a countermeasure, the rotating electrical machine unit 16 is provided with an element temperature detection unit (corresponding to the first temperature detection unit) 24 for detecting the element temperature of each of the switches Sp and Sn. The element temperature detection unit 24 is configured as a temperature-sensitive diode in the present embodiment. A constant current flows through the temperature sensitive diode, and the rotating electrical machine ECU 23 acquires the anode-cathode voltage of the temperature sensitive diode, that is, the forward voltage drop, and based on the acquired forward voltage drop. The element temperature of each switch Sp, Sn is acquired.

  The rotating electrical machine ECU 23 is provided with a thermistor (corresponding to the second temperature detection unit) 29. The rotating electrical machine ECU 23 detects the temperature of the rotating electrical machine ECU 23 (hereinafter referred to as a unit temperature) based on the potential of the thermistor. To do. The rotating electrical machine ECU 23 suppresses that the highest element temperature, which is the highest temperature among the plurality of element temperatures acquired from the element temperature detection unit 24, is higher than the element set temperature, and the unit temperature acquired from the thermistor 29 is The switches Sp and Sn are controlled so as to prevent the temperature from becoming higher than the unit set temperature.

  By the way, as one of the temperature controls, a method of comparing the element maximum temperature and the unit temperature and controlling the switches Sp and Sn based on the higher temperature is conceivable. However, as described above, since the element set temperature and the unit set temperature are often set as different values, the difference between the higher temperature and the corresponding set temperature is the setting corresponding to the lower temperature. It is not always less than the difference with temperature. In other words, the lower temperature may reach the corresponding set temperature before the higher temperature reaches the corresponding set temperature.

  In consideration of this point, in this temperature control, from the reference temperature set lower than the element set temperature and the unit set temperature (for example, the lower limit temperature at which the operation of the switch provided in the inverter 22 and the rotating electrical machine ECU 23 can be guaranteed). The ratio of the range from the reference temperature to the element maximum temperature with respect to the element set temperature is calculated as the element ratio. On the other hand, the ratio of the range from the reference temperature to the unit temperature with respect to the range from the reference temperature to the unit set temperature is calculated as a unit ratio (corresponding to the apparatus ratio). And each switch Sp and Sn is controlled based on the object ratio which is a higher value among the element ratio and the unit ratio.

  In the present embodiment, the switches Sp and Sn are controlled based on the target ratio on condition that the target ratio is higher than the common predetermined ratio. The predetermined ratio is set to a ratio at which the temperature at which the target ratio is calculated (for example, the element temperature when the element ratio is higher than the unit ratio) becomes the corresponding set temperature. That is, when expressed as a percentage, the predetermined ratio is set to 100%.

  The detailed control method of each of the switches Sp and Sn that is performed when the target ratio is higher than the common predetermined ratio varies depending on the driving state of the rotating electrical machine 21 at that time.

  The electric power generation by the rotating electrical machine 21 is required to be carried out continuously when necessary in consideration of power supply to the lead storage battery 11, the lithium ion storage battery 12, and the electric loads 14 and 15. For this reason, as shown in FIG. 3, the power generation amount by the rotating electrical machine 21 is set as the target ratio on the condition that the target ratio is higher than the predetermined ratio during the period in which the power generation is performed by the rotating electrical machine 21. The switches Sp and Sn are controlled so as to be less than the power generation amount immediately before the predetermined ratio is increased. In order to control so that the amount of power generated by the rotating electrical machine 21 is reduced, the energization period of the switches Sp and Sn is controlled to be shorter than the energization period immediately before the target ratio is higher than the predetermined ratio. Thereby, the temperature rise amount per unit time of element temperature becomes small. Accordingly, the amount of power generated by the rotating electrical machine 21 is reduced, and the amount of heat generated by the rotating electrical machine 21 is reduced, so that the temperature increase per unit time of the unit temperature is also reduced. Therefore, in the above-described control, each temperature of the calculation source of the target ratio is maintained at the corresponding set temperature (so that the temperature increase amount per unit time of the temperature of the calculation target of the target ratio is 0). In other words, the switches Sp and Sn may be controlled. With this control, power generation by the rotating electrical machine 21 can be continued.

  In FIG. 3, after the target ratio becomes higher than 100%, the target ratio is calculated as a higher value as the degree of power generation reduction by the rotating electrical machine 21 is larger. For this reason, for example, when the element temperature does not exceed the element set temperature and the predetermined ratio exceeds 100%, but the predetermined ratio exceeds 100%, the element temperature becomes the element set temperature with the power generation amount reduced. It is in a state. In the present embodiment, it is defined that the amount of power generated by the rotating electrical machine 21 becomes 0 when the target ratio becomes 120%.

  On the other hand, if the target ratio becomes higher than the predetermined ratio during the period in which the rotational torque is applied to the crankshaft 43 by the rotating electrical machine 21, the increase in the target ratio per unit time is temporarily increased. It is assumed that the switches Sp and Sn are controlled so that the rotational torque applied to the crankshaft 43 by the rotating electrical machine 21 is reduced so as to be less than the amount. In this case, the rotating electrical machine 21 can apply the rotational torque to the crankshaft 43 even after the target ratio becomes higher than the predetermined ratio. On the other hand, the rotational torque applied to the crankshaft 43 is small. Therefore, there is a concern that the required rotational torque cannot be satisfied. In this case, it is necessary to perform control in which the engine 42 outputs rotational torque to the crankshaft 43 so as to compensate for the insufficient rotational torque, and it is considered that torque control becomes complicated.

  Taking this into consideration, the rotational torque applied to the crankshaft 43 by the rotating electrical machine 21 on the condition that the target ratio is higher than the predetermined ratio during the period in which the rotational torque is applied to the crankshaft 43 by the rotating electrical machine 21. Each of the switches Sp and Sn is controlled so that the application of is stopped (see FIG. 3). More specifically, the energization amount to the rotating electrical machine 21 is determined on the condition that the target ratio is higher than a predetermined ratio during the period in which the rotational torque is applied to the crankshaft 43 by the rotating electrical machine 21. The switches Sp and Sn are controlled so as to be zero. Thereby, after the target ratio becomes higher than the predetermined ratio, the application of torque to the crankshaft 43 by the rotating electrical machine 21 is stopped, and thus the temperature of each of the switches Sp and Sn and the rotating electrical machine ECU 23 is prevented from rising. can do. Further, torque application by the rotating electrical machine 21 is stopped, so that torque control is performed only by the output of the engine 42, and the control can be simplified.

  In the present embodiment, the temperature control shown in FIG. 4 is executed by the rotating electrical machine ECU 23. The temperature control shown in FIG. 4 is repeatedly executed by the rotating electrical machine ECU 23 at a predetermined cycle during the period when the rotating electrical machine ECU 23 is powered on.

  First, in step S100, the element temperatures of the switches Sp and Sn are acquired from the element temperature detector 24, and the unit temperature of the rotating electrical machine ECU 23 is acquired from the thermistor 29. In step S110, the element ratio is calculated based on the highest element maximum temperature among the plurality of element temperatures acquired in step S100. Moreover, a unit ratio is calculated based on the unit temperature acquired in step S100.

  In step S120, it is determined whether the target ratio which is a higher value among the element ratio and the unit ratio calculated in step S110 is higher than a predetermined ratio. When it is determined that the target ratio is not higher than the predetermined ratio (S120: NO), this control is terminated. If it is determined that the target ratio is higher than the predetermined ratio (S120: YES), the process proceeds to step S130.

  In step S130, it is determined whether the rotating electrical machine 21 is generating power. When the rotating electrical machine 21 is generating power (S130: YES), the process proceeds to step S140 so that the power generation amount by the rotating electrical machine 21 is less than the power generation amount immediately before the target ratio is higher than the predetermined ratio. The switches Sp and Sn are controlled. And this control is complete | finished. When the rotating electrical machine 21 is not generating power (S130: NO), the process proceeds to step S150, and the switches Sp and Sn are controlled so that energization to the rotating electrical machine 21 is stopped. And this control is complete | finished.

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

  The temperature assumed to be damaged differs between the switch provided in the inverter 22 and the rotating electrical machine ECU 23. Therefore, by providing different set temperatures for the switch and the rotating electrical machine ECU 23, the temperature of both the switch and the rotating electrical machine ECU 23 is not higher than the temperature assumed to be damaged. Can be controlled.

  By calculating the element ratio and unit ratio, it is possible to grasp how close the current element temperature and unit temperature are to the corresponding set temperatures based on the ratio. In other words, the relationship between the element temperature and the element set temperature and the relationship between the unit temperature and the unit set temperature can be normalized by a ratio. Therefore, by comparing the calculated element ratio and unit ratio, it is possible to easily determine which of the element temperature and the unit temperature is closer to the set temperature. As a result, it is possible to suppress both the element temperature and the unit temperature from becoming higher than the corresponding set temperature by temperature control based on the target ratio. That is, the temperature control by the rotating electrical machine ECU 23 can be simplified.

  According to the above configuration, the switches Sp and Sn are controlled based on the target ratio on condition that the target ratio is higher than the predetermined ratio. Thereby, control which suppresses that the temperature of both element temperature and unit temperature becomes higher than the corresponding setting temperature can be implemented only in the situation where the object ratio becomes higher than the predetermined ratio.

  The above embodiment can also be implemented with the following modifications.

  In the above embodiment, the element temperature detection unit 24 is configured by a temperature sensitive diode. In this regard, the element temperature detection unit 24 may be configured by a thermistor instead of the temperature sensitive diode, and the rotating electrical machine ECU 23 may be configured to detect the element temperature of each of the switches Sp and Sn based on the potential of the thermistor. Further, instead of the thermistor 29 provided in the rotating electrical machine ECU 23, a temperature sensitive diode may be provided so that the rotating electrical machine ECU 23 detects the unit temperature of the rotating electrical machine ECU 23 based on the forward voltage drop of the temperature sensitive diode. .

  In the above embodiment, the rotating electrical machine ECU 23 suppresses that the highest element temperature, which is the highest temperature among the plurality of element temperatures detected by the element temperature detection unit 24, is higher than the element set temperature, and the thermistor The switches Sp and Sn are controlled so as to suppress the unit temperature acquired from the unit 29 from becoming higher than the unit set temperature. Regarding this, a switch to be determined is determined in advance among the switches Sp and Sn, the element temperature of the switch is prevented from becoming higher than the element set temperature, and the unit temperature acquired from the thermistor 29 is the unit set temperature. The switches Sp and Sn may be controlled so as to suppress the height from becoming higher.

  In the above-described embodiment, the switches Sp and Sn are controlled based on a higher target ratio among the element ratio and the unit ratio. With respect to this, based on the difference between the element set temperature and the element temperature and the difference between the unit set temperature and the unit temperature, which has the smaller value (hereinafter referred to as a target difference), the switching element is It is good also as a structure to control. In this case, on the condition that the target difference is lower than a predetermined value (for example, set to 0), switching is performed so as to prevent the temperature from which the target difference is calculated from becoming higher than the corresponding set temperature. Control the element.

  In the above embodiment, the element set temperature is set as the temperature at which the switch provided in the inverter 22 is assumed to be damaged, and the unit set temperature is set as the temperature at which the rotating electrical machine ECU 23 is assumed to be damaged. For this, for example, the element set temperature is set lower than a temperature at which the switch provided in the inverter 22 is assumed to be damaged by a predetermined temperature (a margin temperature considering safety), and the unit set temperature is also damaged by the rotating electrical machine ECU 23. Then, it may be set a predetermined temperature lower than the assumed temperature.

  In the above embodiment, the predetermined ratio is set to a ratio at which the temperature at which the target ratio is calculated becomes the corresponding set temperature. In this regard, the predetermined ratio may be set to a ratio at which the temperature at which the target ratio is calculated is a temperature that is lower than the corresponding set temperature by a predetermined temperature.

  In the above embodiment, the rotation of the rotating electrical machine 21 to the crankshaft 43 is performed on the condition that the target ratio is higher than the predetermined ratio during the period in which the rotational torque is applied to the crankshaft 43 by the rotating electrical machine 21. The switches Sp and Sn are controlled so that the application of torque is stopped. In this regard, the rotation applied to the crankshaft 43 by the rotating electrical machine 21 on the condition that the target ratio becomes higher than the predetermined ratio during the period in which the rotating torque is applied to the crankshaft 43 by the rotating electrical machine 21. The switches Sp and Sn may be controlled so that the torque is reduced.

  In the above embodiment, the amount of power generated by the rotating electrical machine 21 is set to be higher than the predetermined rate on the condition that the target rate is higher than the predetermined rate during the period in which power generation is performed by the rotating electrical machine 21. The switches Sp and Sn are controlled so as to be smaller than the power generation amount immediately before. With respect to this, the switches Sp and Sn are set so that the power generation by the rotating electrical machine 21 is stopped on the condition that the target ratio is higher than the predetermined ratio during the period when the power generation is performed by the rotating electrical machine 21. It can also be configured to be controlled.

  In the embodiment described above, the rotating electrical machine ECU 23 controls the switches Sp and Sn based on the target ratio on the condition that the target ratio is higher than the predetermined ratio. In this regard, the rotating electrical machine ECU 23 may be configured to constantly transmit the target ratio to the engine ECU 40 while performing the temperature control. In this case, the engine ECU 40 is based on the target ratio acquired from the rotating electrical machine ECU 23. The operation of the rotating electrical machine 21 is controlled.

  For example, when the target ratio becomes higher than a threshold value set lower than a predetermined ratio during a period in which rotational torque is applied to the crankshaft 43 by the rotating electrical machine 21, the engine ECU 40 controls the rotating electrical machine ECU 23. Is set smaller than the required torque value immediately before the target ratio becomes higher than the threshold value.

  Alternatively, when the target ratio becomes higher than the threshold during the period in which power generation is performed by the rotating electrical machine 21, the power generation amount of the rotating electrical machine 21 is smaller than the power generation immediately before the target ratio becomes higher than the threshold. Thus, the engine ECU 40 instructs the rotating electrical machine ECU 23.

  By controlling in this way, it is possible to suppress the occurrence frequency of the situation in which the target ratio is higher than the predetermined ratio, and consequently, the frequency of performing the temperature control by the rotating electrical machine ECU 23 can be reduced.

  The engine ECU 40 has an idling stop function for automatically stopping and restarting the engine 42, and the rotating electrical machine ECU 23 generates power by the rotating electrical machine 21 after the engine 42 is automatically restarted. The case where it is the structure to implement is assumed. In this case, it is conceivable that a large current flows through each of the switches Sp and Sn due to power generation performed by the rotating electrical machine 21 after the automatic restart, and the element temperature greatly increases. Further, it is conceivable that the rotating electrical machine 21 generates heat during power generation, and the temperature of the rotating electrical machine ECU 23 rises by receiving the heat. Therefore, the engine ECU 40 prohibits the operation of the idling stop function when the target ratio is higher than the predetermined ratio. Thereby, it can suppress that the temperature of the calculation origin of an object ratio becomes high exceeding the corresponding setting temperature by the electric power generation after the automatic restart of the engine 42.

  DESCRIPTION OF SYMBOLS 16 ... Rotary electric machine unit, 21 ... Rotary electric machine, 23 ... Rotary electric machine ECU, 24 ... Element temperature detection part, 29 ... Unit temperature sensor, 42 ... Engine, 43 ... Crankshaft, Sn ... Lower arm switch, Sp ... Upper arm switch .

Claims (8)

A rotating electrical machine (21) provided to be able to transmit torque to the crankshaft (43) of the engine (42), and a plurality of switching elements (Sp, Sn) for energizing and shutting off each phase of the rotating electrical machine, A control device (23) that controls the operation of the rotating electrical machine by controlling the plurality of switching elements, and a first temperature detection unit (24) that detects the temperature of the switching element as an element temperature. An integrated rotary electric machine unit (16),
A second temperature detector (29) for detecting the temperature of the control device as the device temperature;
The control device suppresses the element temperature detected by the first temperature detection unit from becoming higher than an element set temperature set for the switching element, and is detected by the second temperature detection unit. A rotating electrical machine unit that controls the switching element so as to prevent the device temperature that has been set from becoming higher than a device set temperature set for the control device.   The control device includes an element as a ratio of a range from the reference temperature to the element temperature with respect to the element set temperature and a range from the reference temperature set lower than the device set temperature to the element set temperature. Based on the target ratio that is a higher value among the ratio and the apparatus ratio as the ratio that the range from the reference temperature to the apparatus temperature occupies the range from the reference temperature to the apparatus set temperature, The rotating electrical machine unit according to claim 1, wherein the switching element is controlled.   The rotating electrical machine unit according to claim 2, wherein the control device controls the switching element based on the target ratio on condition that the target ratio is higher than a common predetermined ratio. The rotating electrical machine has a power generation function of generating power by rotation of the crankshaft of the engine,
The control device is configured to calculate the amount of power generated by the rotating electrical machine as long as the target ratio is higher than a common predetermined ratio during the period in which the power generation is performed by the rotating electrical machine. 4. The rotating electrical machine unit according to claim 2, wherein the switching element is controlled to be smaller than the power generation amount immediately before the predetermined ratio is increased. The rotating electrical machine has a torque imparting function for imparting rotational torque to the crankshaft of the engine,
The control device is configured so that the crankshaft by the rotating electrical machine is provided on the condition that the target ratio is higher than a common predetermined ratio during the period in which the rotational torque is applied to the crankshaft by the rotating electrical machine. The rotating electrical machine unit according to any one of claims 2 to 4, wherein the switching element is controlled so as to stop applying the rotational torque to the motor. The element set temperature is set as a temperature at which the switching element is assumed to be damaged,
The rotating electrical machine unit according to any one of claims 2 to 5, wherein the device set temperature is set as a temperature at which the control device is assumed to be damaged.   The rotating electrical machine unit according to any one of claims 2 to 6, wherein the control device transmits the target ratio to an engine control unit (40) that controls the engine. The rotating electrical machine unit (16) according to any one of claims 2 to 7,
An engine (42);
A control unit (40) for controlling the operation of the engine and the rotating electrical machine unit;
The controller has an automatic stop / restart function for automatically stopping and restarting the engine, and the rotating electrical machine has a power generation function for generating power by rotating the crankshaft of the engine. A vehicle in which power generation by the rotating electrical machine is performed after the automatic restart is performed by the control unit,
The control unit prohibits the operation of the automatic stop / restart function when the target ratio is higher than a common predetermined ratio.

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