JP2017135907A - Vehicular control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular control device capable of preventing overheating of high-voltage equipment, such as a rotating electric machine and an inverter, when a plurality of functions using the high-voltage equipment are preformed.SOLUTION: An HCU 10 is mounted to a vehicle 1 that has, as a driving source, a motor generator 4 driven by receiving electric power supply from a high-voltage third power storage device 33 via an inverter 50, and controls a state of the vehicle by using various types of functions using the motor generator. When determining whether one or both of the inverter and the motor generator are in an overheated state, the HCU restricts output from the motor generator and executes part of the provided functions.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicular control device that mounts a rotating electrical machine as a driving power source and executes various functions.

  A vehicle equipped with a rotating electrical machine as a power source has a plurality of functions to be executed according to a driver's request and a vehicle state. The rotating electrical machine is connected to a battery via an inverter.

  The rotating electrical machine has an electric function that functions as a power source using the electric power of the battery and a power generation function that generates power during deceleration and charges the battery.

  If the rotating electrical machine continues to output more than the continuous rating to satisfy all the requirements for multiple functions, the rotating electrical machine and the inverter may overheat.

  Patent Document 1 discloses a control device that prevents input / output exceeding the short-time rating of the battery even if the short-time rated use of a plurality of loads overlaps.

  However, in the configuration of Patent Document 1, in order not to exceed the short-time rating of the battery, only one of a plurality of loads can be used, and the use of the other needs to be abandoned. For this reason, there was a problem that it was not possible to meet the demands on the vehicle side.

JP 2013-135487 A

  Therefore, the present invention provides a vehicle control device capable of preventing overheating of a high voltage device such as a rotating electrical machine or an inverter when a plurality of functions using the high voltage device is performed. It is aimed.

  One aspect of the invention of a vehicle control device that solves the above problems is mounted on a vehicle including a rotating electrical machine that is driven by receiving power supply from a high-voltage battery via an inverter, and uses the rotating electrical machine. A vehicle control device that controls the state of a vehicle by various functions, wherein an overheat determination unit that determines whether one or both of the inverter and the rotating electrical machine are in an overheat state, and the overheat determination unit, A limit control unit that limits an output of the rotating electrical machine and executes a part of the functions when it is determined that one or both of the inverter and the rotating electrical machine are in an overheated state. .

  According to the present invention, since the output of the rotating electrical machine is limited in some of the functions using the high voltage device, the high voltage device such as the rotating electrical machine or the inverter is prevented from overheating. Can do.

FIG. 1 is a diagram showing an example of a hybrid vehicle equipped with a control device according to the first embodiment of the present invention, and is a block diagram showing a schematic overall configuration thereof. FIG. 2 is a block diagram for explaining the functions of the HCU constituting the control device. FIG. 3 is a flowchart illustrating a control process (control method) for limiting the hybrid function. FIG. 4 is a time chart showing the relationship between the temperature of the high-voltage device and the output restriction control of various functions. FIG. 5 is a diagram illustrating an example of a hybrid vehicle equipped with a control device according to the second embodiment of the present invention, and is a flowchart illustrating a control process (control method) for limiting the hybrid function. FIG. 6 is a time chart showing the relationship between the temperature of the high voltage device and the output restriction control of various functions. FIG. 7 is a diagram illustrating an example of a hybrid vehicle equipped with a control device according to the third embodiment of the present invention, and is a flowchart illustrating a control process (control method) for limiting the hybrid function. FIG. 8 is a time chart showing the relationship between the temperature of the high-voltage device and the output restriction control of various functions.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(Basic configuration of the embodiment of the present invention described below)
FIG. 1 and FIG. 2 are common views for explaining the three embodiments of the present invention.

  In FIG. 1, a vehicle 1 is mounted with an internal combustion engine type engine 2 and a motor generator (also referred to as a rotating electric machine) 4 as drive sources, and is driven by rotating drive wheels 5 via a transmission 3. Has been built. That is, the vehicle 1 is also configured as an electric vehicle that travels with the driving force of the motor generator 4.

  The vehicle 1 is equipped with an HCU (Hybrid Control Unit) 10, an ECM (Engine Control Module) 11, and a TCM (Transmission Control Module) 12 as control systems, each of which is stored in advance in a memory. Thus, efficient driving is realized by controlling the driving of the engine 2, the transmission 3 and the motor generator 4.

  Here, in the vehicle 1, a control process in which the HCU 10 is started or stopped according to the operation of the ignition key by the driver detected by the ignition switch 9 is executed, and the HCU 10 comprehensively controls the entire vehicle 1, The ECM 11 controls the engine 2 and the TCM 12 is configured to control the transmission 3.

  The engine 2 is formed with a plurality of cylinders. The engine 2 is configured to perform a series of four strokes including an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke for each cylinder.

  The vehicle 1 has an EV (Electric Vehicle) mode in which the engine 2 is stopped and the vehicle 1 is driven by the driving force of the motor generator 4. The vehicle 1 also has an idling stop function that automatically stops the engine 2 in accordance with a preset stop condition and restarts the engine 2 in accordance with a preset restart condition.

  The engine 2 is connected to an integrated starter generator (ISG) 20 and a starter 21. The ISG 20 is connected to the crankshaft 18 of the engine 2 via a belt 22 or the like. The ISG 20 has a function of an electric motor that starts the engine 2 by rotating by being supplied with electric power, and a function of a generator that converts the rotational force input from the crankshaft 18 into electric power.

  The vehicle 1 includes an ISGCM (Integrated Starter Generator Control Module) 13 as a control system, and the ISGCM 13 controls driving of the ISG 20 according to a control program stored in advance in a memory.

  The ISG 20 functions as an electric motor so as to restart the engine 2 from a stopped state by the idling stop function.

  The starter 21 includes a motor and a pinion gear (not shown). The starter 21 rotates the crankshaft 18 by rotating the motor to give the engine 2 a starting torque. As described above, the engine 2 is started by the starter 21 and restarted by the ISG 20 from the stop state by the idling stop function.

  The transmission 3 shifts and transmits the driving torque output from the engine 2, and rotates the driving wheels 5 via a drive shaft (axle) 23. The transmission 3 includes a rotation speed (the number of rotations) of the drive shaft 23 of each of the left and right drive wheels 5 and a clutch 26 constituted by a normally-meshing type transmission mechanism 25 composed of a parallel shaft gear mechanism, a normally closed dry clutch. ) And an actuator (not shown).

  The transmission 3 is configured as a so-called AMT (Automated Manual Transmission), and a speed change in a speed change mechanism 25 driven by an actuator according to detection information of a vehicle speed sensor 75 that detects a rotation speed (rotation speed) of the drive shaft 23. The stage is switched and the clutch 26 is engaged / disengaged. The differential mechanism 27 receives the power output by the speed change mechanism 25 and transmits it to the left and right drive shafts 23.

  The motor generator 4 is connected to the differential mechanism 27 via a power transmission mechanism 28 such as a chain. The motor generator 4 functions as an electric motor.

  Thus, the vehicle 1 is constructed in a parallel hybrid system that can use the power of both the engine 2 and the motor generator 4 for driving the vehicle, and the power output by at least one of the engine 2 and the motor generator 4. It comes to run by.

  The motor generator 4 also functions as a generator, and generates power when the vehicle 1 travels at a reduced speed.

  Here, the motor generator 4 has a structure that is directly connected to the drive shaft 23 via a differential mechanism 27 and a power transmission mechanism 28, and rotates at the same time when the drive wheels 5 rotate. The motor generator 4 may be connected to any part of the power transmission path from the engine 2 to the drive wheel 5 so as to be able to transmit power, and is not necessarily connected to the differential mechanism 27.

  Further, the vehicle 1 includes a first power storage device 30, a low voltage power pack 32 including a second power storage device 31, a high voltage power pack 34 including a third power storage device 33, a high voltage cable 35, and a low voltage cable. 36.

  The first power storage device 30, the second power storage device 31, and the third power storage device 33 are composed of rechargeable secondary batteries. The second power storage device 31 is a power storage device that can store higher power and higher energy density than the first power storage device 30. The second power storage device 31 can be charged in a shorter time than the first power storage device 30. The first power storage device 30 and the second power storage device 31 are low voltage batteries in which the number of cells and the like are set so as to generate an output voltage of about 12V. In this embodiment, the 1st electrical storage apparatus 30 consists of lead batteries, and the 2nd electrical storage apparatus 31 consists of lithium ion batteries. The second power storage device 31 may be a nickel hydride storage battery.

  The third power storage device 33 constitutes a high voltage battery by setting the number of cells and the like so as to generate a higher voltage than the first power storage device 30 and the second power storage device 31, and for example, an output of 100V Generate voltage. The 3rd electrical storage apparatus 33 consists of a lithium ion battery, for example. The third power storage device 33 may be a nickel hydride storage battery.

  The high voltage power pack 34 includes an inverter 50, an INVCM 14, and a high voltage BMS 16 in addition to the third power storage device 33, and is formed in a high voltage circuit. The high voltage power pack 34 is connected to the motor generator 4 via a high voltage cable 35 so that electric power can be supplied.

  The vehicle 1 is provided with a general load 37 and a protected load 38 as electric loads. The general load 37 and the protected load 38 are electric loads other than the starter 21 and the ISG 20.

  The protected load 38 is an electric load that always requires a stable power supply. The protected load 38 includes, for example, a stability control device 38A that prevents a side slip of the vehicle 1, an electric power steering control device 38B that electrically assists an operating force of a steering wheel (not shown), and a headlight 38C. . The protected load 38 also includes instrument panel lamps and meters (not shown) and a car navigation system.

  The general load 37 is an electric load that is temporarily used without requiring stable power supply as compared with the protected load 38. The general load 37 includes, for example, a wiper (not shown) and an electric cooling fan that blows cooling air to the engine 2.

  The low voltage power pack 32 includes switches 40 and 41 and a low voltage BMS 15 in addition to the second power storage device 31. First power storage device 30 and second power storage device 31 are connected to starter 21, ISG 20, general load 37 as an electrical load, and protected load 38 via low voltage cable 36 so as to be able to supply power. Yes. The first power storage device 30 and the second power storage device 31 are electrically connected in parallel to the protected load 38.

  The switch 40 is provided in the low voltage cable 36 between the second power storage device 31 and the protected load 38. The switch 41 is provided in the low voltage cable 36 between the first power storage device 30 and the protected load 38.

  The vehicle 1 includes an INVCM (Invertor Control Module) 14, a low voltage BMS (Battery Management System) 15, and a high voltage BMS 16 as a control system, each of which is an inverter according to a control program stored in advance in a memory. 50 drive and charging / discharging of the 1st electrical storage apparatus 30, the 2nd electrical storage apparatus 31, and the 3rd electrical storage apparatus 33 are controlled.

  The INVCM 14 controls the inverter 50 to mutually convert AC power applied to the high voltage cable 35 and DC power applied to the third power storage device 33. For example, when powering the motor generator 4, the INVCM 14 converts the DC power discharged by the third power storage device 33 into AC power by the inverter 50 and supplies the AC power to the motor generator 4. Further, when regenerating motor generator 4, INVCM 14 converts AC power generated by motor generator 4 into DC power by inverter 50 and charges third power storage device 33.

  The low voltage BMS 15 controls charging / discharging of the second power storage device 31 and power supply to the protected load 38 by controlling opening and closing of the switches 40 and 41. When the engine 2 is stopped due to idling stop, the low voltage BMS 15 is stabilized to the protected load 38 from the high power and high energy density second power storage device 31 by closing the switch 40 and opening the switch 41. It is designed to supply power.

  When the engine 2 is started by the starter 21 and when the engine 2 stopped by the idling stop control is restarted by the ISG 20, the low voltage BMS 15 opens the switch 41 and opens the switch 41. Electric power is supplied from the power storage device 30 to the starter 21 or the ISG 20. When the switch 40 is closed and the switch 41 is opened, power is also supplied from the first power storage device 30 to the general load 37.

  The high voltage BMS 16 manages the state such as the remaining capacity of the third power storage device 33. The high voltage BMS 16 controls the HCU 10 based on a speed sensor 76 that detects the rotation speed (rotation speed) of the motor generator 4 so as to cooperate with the INVCM 14 so that the motor generator 4 can be driven efficiently. It has become.

  As described above, the first power storage device 30 supplies at least electric power to the starter 21, the ISG 20, and the general load 37 as a starting device that starts the engine 2. The second power storage device 31 supplies power to the protected load 38.

  In the second power storage device 31, the switches 40 and 41 are controlled by the low voltage BMS 15 so as to supply power to the protected load 38 for which stable power supply is always required.

  As described above, the low voltage BMS 15 is protected while taking into consideration the charging state (remaining charge amount) of the first power storage device 30 and the second power storage device 31, and the operation requests to the general load 37 and the protected load 38. Prioritizing stable operation of the load 38, the switches 40 and 41 are appropriately controlled.

  Here, the vehicle 1 is laid with CAN communication lines 48 and 49 for forming an in-vehicle LAN (Local Area Network) conforming to a standard such as CAN (Controller Area Network). The HCU 10 is connected to the INVCM 14 and the high voltage BMS 16 by a CAN communication line 48. The HCU 10, the INVCM 14 and the high voltage BMS 16 mutually transmit and receive signals such as control signals via the CAN communication line 48. The HCU 10 is connected to the ECM 11, the TCM 12, the ISGCM 13, and the low voltage BMS 15 by a CAN communication line 49. The HCU 10, ECM 11, TCM 12, ISGCM 13, and low voltage BMS 15 mutually transmit and receive signals such as control signals via the CAN communication line 49.

  The vehicle 1 drives at least one of the engine 2 and the motor generator 4 and is equipped with various functions that are executed according to the driver's request and the state of the vehicle.

  The HCU 10 cooperates with the ECM 11, the TCM 12, the ISGCM 13, the INVCM 14, the low voltage BMS 15, and the high voltage BMS 16 on the basis of various sensor information for detecting the state of the vehicle 1, so that the engine 2 and the motor generator 4 One or both of them are operated to execute various functions.

Here, various functions will be specifically described.
The “sliding prevention function 10A (function for ensuring vehicle safety)” is a function that uses the output of the motor generator 4 to prevent the vehicle 1 from moving backward on an uphill road or the like. This slip-down prevention function is executed using a known control method.

  The “starting performance improvement function 10B (drivability improvement function)” is a function that uses the output of the motor generator 4 when the vehicle 1 is started or when traveling at an extremely low speed (creep traveling). This function is intended to improve starting performance or vehicle comfort.

  The “intermediate drive assist function 10C (drivability improvement function)” is an acceleration travel state that does not correspond to the start performance improvement function of the vehicle 1, and the amount of change based on the driving force requested by the driver is a certain amount or more (excluding full-open acceleration) This function assists acceleration using the output of the motor generator 4 in some cases. This function is aimed at increasing product power by improving running performance (acceleration performance).

  The “gap filling function 10D (drivability improvement function)” is a function that uses the output of the motor generator 4 to fill a period (gap) during which the engine power is not transmitted due to the engagement of the clutch 26 when the vehicle 1 is shifted. It is. This function is aimed at improving acceleration performance at the time of shifting and improving vehicle comfort at the time of shifting.

  The “power assist function 10E (drivability improvement function)” is a function that uses the output of the motor generator 4 when the vehicle 1 is fully opened. This function is aimed at increasing product power by improving running performance (acceleration performance).

  The “brake regeneration function 10F (fuel efficiency improvement function)” is a function that uses the motor generator 4 as a generator when the vehicle 1 is decelerating. If this function is used, the state of charge of the power storage device for driving can be improved, which leads to a reduction in fuel consumption of the engine.

  That is, as shown in FIG. 2, the HCU 10 executes a control program stored in the memory 10M, and according to detection information from various sensors and various parameters, the ECM 11, the TCM 12, the ISGCM 13, the INVCM 14, the low voltage BMS 15, and the high voltage By collaborating in cooperation with the BMS 16, a sliding prevention function 10A, a start performance improvement function 10B, an intermediate drive assist function 10C, a gap filling function 10D, a power assist function 10E, and a brake regeneration function 10F that constitute various functions are provided. Run.

  As described above, the various functions 10 </ b> A to 10 </ b> F executed by the HCU 10 are functions that use the motor generator 4.

  By the way, the motor generator 4 and the inverter 50 interposed in the exchange of electric power between the motor generator and the third power storage device 33 generate heat by a driving load corresponding to the electric energy. For this reason, temperature sensors 77 and 78 are provided in motor generator 4 and inverter 50, respectively. The HCU 10 and the INVCM 14 use these two temperature sensors to perform temperature management so as not to exceed a preset use temperature. A temperature sensor 79 is provided in the third power storage device 33 and is temperature-controlled by the high voltage BMS 16.

  The various functions 10A to 10F can be executed in a state where the continuous rated current of the motor generator 4 and the inverter 50 is exceeded in order to return the effect to the driver as much as possible. For this reason, if each function continues to be executed in a state where the continuous rated current of the motor generator 4 and the inverter 50 is exceeded, the temperature of the motor generator 4 and the inverter 50 will rise and reach the upper limit of the use temperature.

  The HCU 10 manages the temperature rise of the motor generator 4 and the inverter 50 due to the execution of these various functions 10A to 10F, and performs control so as not to exceed the upper limit of the use temperature.

  In order to realize the control that does not exceed the operating temperature, the temperature of the motor generator 4 and the inverter 50 that can be continuously executed even if the continuous rated current is exceeded for each function or for each group after the various functions are grouped. (In the following description, described as an overheat threshold) is set in advance. This overheat threshold is set to at least two or more according to the importance of various functions.

  That is, in the case where two overheat thresholds are set as an example, a function having a low overheat threshold reaches the threshold earlier than a function having a high overheat threshold. For this reason, a function having a low overheat threshold is faster than a function having a high overheat threshold, and a control exceeding the continuous rated current (in the following description, referred to as normal control) to a control below the continuous rated current (explained below) Is described as output restriction control). In other words, a function having a low overheat threshold executes the output restriction control in preference to a function having a high overheat threshold.

  Furthermore, in the value of the overheat threshold, when the temperature rises by executing the normal control and reaches the overheat threshold, the temperature at which the output restriction control is started (in the following description, described as the start temperature), The temperature is reduced by executing the output restriction control, and is configured to be a temperature when returning to the normal control (in the following description, described as a return temperature).

  Moreover, it is comprised by three embodiment by the difference in the method of setting an overheat threshold. The first embodiment is an example in which the overheat threshold (both the start temperature and the return temperature) are different for each of the above-described six various functions. The second embodiment is an example in which the overheat threshold (both the start temperature and the return temperature) of the sliding prevention function 10A and the other five functions (10B to 10F) are different among the six various functions. The third embodiment is an example in which the start temperature of the overheat threshold is set differently for each of the six functions, and the return temperature of the overheat threshold is set to the same temperature for all the six functions.

  The set values of the overheat threshold values of the three embodiments described above are all stored in the storage device 10M in the HCU 10.

  The HCU 10 compares the value detected by the temperature sensors 77 and 78 with the start temperature of the overheat threshold, and if the temperature detected by any of the temperature sensors 77 and 78 is higher than the start temperature of the overheat threshold, the high voltage device An overheat determination unit 10j that determines that (the motor generator 4, the inverter 50) is overheated is provided.

  Further, the HCU 10 includes a limit control unit 10r that instructs output limit control of a high-voltage device when the overheat determination unit 10j determines that the overheat is overheated.

(First embodiment of the present invention)
The first embodiment is an example in which the overheat threshold (both the start temperature and the return temperature) are different for each of the six various functions. That is, the overheat thresholds (start temperature and return temperature) of each of the six functions including the slip prevention function 10A, the start performance improvement function 10B, the intermediate drive assist function 10C, the gap filling function 10D, the power assist function 10E, and the brake regeneration function 10F. Both) are different.

  The output restriction control in the case of overheating in the first embodiment will be described with reference to the flowchart of FIG. 3 and the time chart showing the relationship between the temperature of the high voltage device and the output restriction control of various functions in FIG.

  In FIG. 3, the HCU 10 determines whether or not various functions 10A to 10F using the motor generator are executed (step S111).

  When it is determined in step S111 that the various functions 10A to 10F using the motor generator are not executed, the HCU 10 ends the flowchart of FIG.

  When it is determined in step S111 that the various functions 10A to 10F using the motor generator are being executed, the HCU 10 detects the high voltage device detected by the temperature sensors 77 and 78 of the high voltage device (motor generator 4, inverter 50). The temperature T is acquired (step S112).

  Next, the HCU 10 determines whether or not the temperature T of the high-voltage device is higher than the start temperature T11f of the function 10F (Step S113).

  When it is determined in step S113 that the temperature T of the high-voltage device is higher than the start temperature T11f of the function 10F, the function 10F is executed after changing the motor generator control state from the normal control to the output restriction control in which the output is reduced. (Step S114).

  If it is determined in step S113 that the temperature T of the high-voltage device is equal to or lower than the start temperature T11f of the function 10F, the high-voltage device is not in an overheated state and continues normal control.

  Next, the HCU 10 determines whether or not the temperature T of the high-voltage device is higher than the start temperature T11e of the function 10E in order to determine whether or not there is a further temperature increase by executing various functions (step S115).

When it is determined in step S115 that the temperature T of the high-voltage device is higher than the start temperature T11e of the function 10E, the function 10E executes after changing the motor generator control state from the normal control to the output restriction control in which the output is reduced. (Step S116). Thereby, the functions using the output restriction control are 10F and 10E.
If it is determined in step S115 that the temperature T of the high-voltage device is equal to or lower than the start temperature T11e of the function 10E, only the function 10F returns to the state where the output restriction control is performed.

  Next, the HCU 10 determines whether or not the temperature T of the high-voltage device is higher than the start temperature T11d of the function 10D in order to determine whether or not there is a further temperature increase by executing various functions (step S117).

  When it is determined in step S117 that the temperature T of the high-voltage device is higher than the start temperature T11d of the function 10D, the function 10D executes after changing the motor generator control state from the normal control to the output restriction control with the output reduced. (Step S118). Thereby, the functions using the output restriction control are 10F, 10E, and 10D.

  If it is determined in step S117 that the temperature T of the high-voltage device is equal to or lower than the start temperature T11d of the function 10D, the functions 10E and 10F return to the state where the output restriction control is performed.

  Next, the HCU 10 determines whether or not the temperature T of the high-voltage device is higher than the start temperature T11c of the function 10C in order to determine whether or not there is a further temperature rise by executing various functions (step S119).

  If it is determined in step S119 that the temperature T of the high-voltage device is higher than the start temperature T11c of the function 10C, the function 10C is executed after changing the motor generator control state from the normal control to the output restriction control in which the output is reduced. (Step S120). Thereby, the functions using the output restriction control are 10F, 10E, 10D, and 10C.

  When it is determined in step S119 that the temperature T of the high-voltage device is equal to or lower than the start temperature T11c of the function 10C, the functions 10D, 10E, and 10F return to the state where the output restriction control is performed.

  Next, the HCU 10 determines whether or not the temperature T of the high-voltage device is higher than the start temperature T11b of the function 10B in order to determine whether or not there is a further temperature increase by executing various functions (step S121).

  When it is determined in step S121 that the temperature T of the high-voltage device is higher than the start temperature T11b of the function 10B, the function 10B is executed after changing the motor generator control state from the normal control to the output restriction control in which the output is reduced. (Step S122). Thereby, the functions using the output restriction control are 10F, 10E, 10D, 10C, and 10B.

  If it is determined in step S121 that the temperature T of the high-voltage device is equal to or lower than the start temperature T11b of the function 10B, the functions 10C, 10D, 10E, and 10F return to the state where the output restriction control is performed.

  Next, the HCU 10 determines whether or not the temperature T of the high-voltage device is higher than the start temperature T11a of the function 10A in order to determine whether or not there is a further temperature increase by executing various functions (step S123).

  When it is determined in step S123 that the temperature T of the high-voltage device is higher than the start temperature T11a of the function 10A, the function 10A is executed after changing the motor generator control state from the normal control to the output restriction control in which the output is reduced. (Step S124). As a result, functions using the output restriction control are 10F, 10E, 10D, 10C, 10B, and 10A.

  If it is determined in step S123 that the temperature T of the high-voltage device is equal to or lower than the start temperature T11a of the function 10A, the functions 10B, 10C, 10D, 10E, and 10F are returned to the state where the output restriction control is performed.

  By executing step 124, all the functions 10A to 10F are changed to output restriction control. After that, when the temperature of the high voltage device is lowered, the normal control is restored in order.

Step S125 and subsequent steps relate to return control.
When it is determined in step S125 that the temperature T of the high-voltage device is lower than the return temperature T12a of the function 10A, the function 10A is executed after returning the motor generator control state from the output restriction control to the normal control (step S126). ). Thereby, the functions using the output restriction control are 10F, 10E, 10D, 10C, and 10B.

  If it is determined in step S125 that the temperature T of the high-voltage device is equal to or higher than the return temperature T12a of the function 10A, the state where all the functions 10A to 10F are changed to the output restriction control is continued, assuming that the overheating state is still continued. .

  When it is determined in step S127 that the temperature T of the high-voltage device is lower than the return temperature T12b of the function 10B, the function 10B is executed after returning the motor generator control state from the output restriction control to the normal control (step S128). ). Thereby, the functions using the output restriction control are 10F, 10E, 10D, and 10C.

  If it is determined in step S127 that the temperature T of the high-voltage device is equal to or higher than the return temperature T12b of the function 10B, the state where the functions 10B to 10F are changed to the output restriction control is continued assuming that the overheating state is still continued.

  When it is determined in step S129 that the temperature T of the high-voltage device is lower than the return temperature T12c of the function 10C, the function 10C is executed after returning the motor generator control state from the output restriction control to the normal control (step S130). ). Thereby, the functions using the output restriction control are 10F, 10E, and 10D.

  If it is determined in step S129 that the temperature T of the high voltage device is equal to or higher than the return temperature T12c of the function 10C, the state where the functions 10C to 10F are changed to the output restriction control is continued, assuming that the overheating state is still continued.

  If it is determined in step S131 that the temperature T of the high-voltage device is lower than the return temperature T12d of the function 10D, the function 10D is executed after returning the motor generator control state from the output restriction control to the normal control (step S132). ). Thereby, the functions using the output restriction control are 10F and 10E.

  If it is determined in step S131 that the temperature T of the high-voltage device is equal to or higher than the return temperature T12d of the function 10D, the state where the functions 10D to 10F are changed to the output restriction control is continued, assuming that the overheating state is still continued.

  If it is determined in step S133 that the temperature T of the high-voltage device is lower than the return temperature T12e of the function 10E, the function 10E is executed after returning the motor generator control state from the output restriction control to the normal control (step S134). ). Thereby, the function using the output restriction control is 10F.

  If it is determined in step S133 that the temperature T of the high-voltage device is equal to or higher than the return temperature T12e of the function 10E, the state where the functions 10E to 10F are changed to the output restriction control is continued, assuming that the overheating state is still continued.

  When it is determined in step S135 that the temperature T of the high-voltage device is lower than the return temperature T12f of the function 10F, the function 10F is executed after returning the motor generator control state from the output restriction control to the normal control (step S136). ). Thereby, all functions are executed using the normal control, and the flowchart of FIG. 3 ends.

  If it is determined in step S135 that the temperature T of the high-voltage device is equal to or higher than the return temperature T12f of the function 10F, the state where the function 10F is changed to the output restriction control is continued, assuming that the overheating state is still continued.

  In FIG. 4, the output restriction control of the function 10F is first executed (time f1) due to the temperature rise of the high-voltage device. If the temperature rise does not stop even after executing this output restriction, the function 10E (time e1), function 10D (time d1), function 10C (time c1), function 10B (time b1), The output restriction control is executed in the order of 10A (time a1). The temperature increase is suppressed by the output restriction control of the six various functions (10A to 10F), and the temperature starts to decrease. When the temperature falls below T12a, the output restriction control of the function 10A is canceled and the normal control is resumed. Further, the output restriction control is canceled in the order of the function 10B, the function 10C, the function 10B, and the function 10A as the temperature decreases, and the normal control is restored.

  The various functions using the output control of the motor generator are ranked based on the contents of the functions. Since the set temperature for executing the output limit control of the motor generator is different for each ranked function, even if the temperature of the high-voltage device rises, various functions will not execute the output limit control at the same time. It is possible to minimize the degradation of the vehicle running performance due to the output restriction. In addition, since the number of functions for which output restriction control is executed in stages increases according to the temperature rise (overheating condition), a highly reliable system that makes it difficult for the driver to feel that output restriction is being executed Can be built. Functions that contribute to ranking and vehicle stability improvement (sliding prevention function) have a set temperature at which output restriction control is most difficult to be executed, and thus can contribute to maintaining the reliability of the vehicle.

(Second embodiment of the present invention)
The second embodiment is an example in which six functions are divided into two groups, and the overheat threshold (both the start temperature and the return temperature) are different for each group. That is, the first group includes the slip-down prevention function 10A, and the second group includes the remaining start performance improving function 10B, intermediate drive assist function 10C, gap filling function 10D, power assist function 10E, and brake regeneration function 10F. . The first group and the second group have different overheat threshold values (both the start temperature and the return temperature). The output restriction control in the case of overheating in the second embodiment will be described using the flowchart of FIG. 5 and the time chart showing the relationship between the temperature of the high voltage device and the output restriction control of various functions in FIG.

In FIG. 5, the HCU 10 determines whether or not various functions 10A to 10F using the motor generator are executed (step S211).
If it is determined in step S211 that the various functions 10A to 10F using the motor generator are not executed, the HCU 10 ends the flowchart of FIG.
If it is determined in step S211 that the various functions 10A to 10F using the motor generator are being executed, the HCU 10 detects the high voltage device detected by the temperature sensors 77 and 78 of the high voltage device (motor generator 4, inverter 50). The temperature T is acquired (step S212).

  Next, the HCU 10 determines whether or not the temperature T of the high voltage device is higher than the start temperature T21b of the second group (step S213).

  When it is determined in step S213 that the temperature T of the high voltage device is higher than the start temperature T21b of the second group, the functions 10B to 10F belonging to the second group output the motor generator control state whose output is reduced from the normal control. It is executed after changing to the limit control (step S214).

  If it is determined in step S213 that the temperature T of the high voltage device is equal to or lower than the start temperature T21b of the second group, the normal control is continued because the high voltage device is not overheated.

  Next, the HCU 10 determines whether or not the temperature T of the high-voltage device is higher than the start temperature T21a of the first group in order to determine whether or not there is a further temperature increase by executing various functions (step S215). .

  When it is determined in step S215 that the temperature T of the high-voltage device is higher than the start temperature T21a of the first group, the function belonging to the first group switches the motor generator control state from the normal control to the output limit control in which the output is reduced. It is executed after changing (step S216). As a result, functions using the output restriction control are 10F, 10E, 10D, 10C, 10B, and 10A.

  When it is determined in step S215 that the temperature T of the high voltage device is equal to or lower than the start temperature T21a of the first group, only the second group returns to the state where the output restriction control is performed.

  By executing step 216, all the functions 10A to 10F are changed to the output restriction control. After that, when the temperature of the high voltage device is lowered, the normal control is restored in order.

Step S217 and subsequent steps relate to return control.
If it is determined in step S217 that the temperature T of the high voltage device is lower than the return temperature T22a of the first group, the function belonging to the first group is executed after returning the motor generator control state from the output restriction control to the normal control. (Step S218). Thereby, the functions using the output restriction control are 10F, 10E, 10D, 10C, and 10B.

  If it is determined in step S217 that the temperature T of the high-voltage device is equal to or higher than the return temperature T22a of the first group, the state where all functions 10A to 10F are changed to the output restriction control is continued, assuming that the overheating state is still continued. To do.

  If it is determined in step S219 that the temperature T of the high voltage device is lower than the return temperature T22b of the second group, the second group is executed after returning the motor generator control state from the output restriction control to the normal control ( Step S220). Thereby, all the functions are executed using the normal control, and the flowchart of FIG. 5 ends.

  When it is determined in step S219 that the temperature T of the high voltage device is equal to or higher than the return temperature T22b of the second group, the state where the second group is changed to the output restriction control is continued, assuming that the overheating state is still continued.

  In FIG. 6, the output restriction control of the function belonging to the second group is first executed due to the temperature rise of the high voltage device (time b1). If the temperature rise does not stop even after executing this output restriction, the output restriction of the function belonging to the first group is executed (time a1). Due to the output restriction control of the first group and the second group, the temperature rise is stopped and the temperature starts to fall. When the temperature drops below T22a, the output restriction control of the first group is canceled and the normal control is resumed. Further, when the temperature falls and falls below T22b, the output restriction control of the second group is canceled and the normal control is resumed.

  Of the various functions, only the slip prevention function 10A belonging to the first group can delay the execution of the motor generator output restriction control, so that the normal control of the motor generator can be maintained longer than the other functions. Since it is possible to continue, stable vehicle travel can be realized.

(Third embodiment of the present invention)
The third embodiment is an example in which the start temperature of the overheat threshold is different for each of the six various functions, and the six various functions have the same value for the return temperature of the overheat threshold. The six functions are the same as in the first and second embodiments, such as a sliding prevention function 10A, a start performance improving function 10B, an intermediate drive assist function 10C, a gap filling function 10D, a power assist function 10E, and a brake regeneration function. 10F. The output restriction control in the case of overheating in the third embodiment will be described with reference to the flowchart of FIG. 7 and the time chart showing the relationship between the temperature of the high voltage device and the output restriction control of various functions in FIG.

  In FIG. 7, the HCU 10 determines whether or not various functions 10A to 10F using the motor generator are executed (step S311).

  If it is determined in step S311 that the various functions 10A to 10F using the motor generator are not executed, the HCU 10 ends the flowchart of FIG.

  If it is determined in step S311 that the various functions 10A to 10F using the motor generator are being executed, the HCU 10 detects the high voltage device detected by the temperature sensors 77 and 78 of the high voltage device (motor generator 4, inverter 50). The temperature T is acquired (step S312).

  Next, the HCU 10 determines whether or not the temperature T of the high-voltage device is higher than the start temperature T31f of the function 10F (step S313).

  When it is determined in step S313 that the temperature T of the high-voltage device is higher than the start temperature T31f of the function 10F, the function 10F is executed after changing the motor generator control state from the normal control to the output restriction control in which the output is reduced. (Step S314).

  If it is determined in step S313 that the temperature T of the high voltage device is equal to or lower than the start temperature T31f of the function 10F, the normal control is continued because the high voltage device is not overheated.

  Next, the HCU 10 determines whether or not the temperature T of the high-voltage device is higher than the start temperature T31e of the function 10E in order to determine whether or not there is a further temperature increase by executing various functions (step S315).

  When it is determined in step S315 that the temperature T of the high-voltage device is higher than the start temperature T31e of the function 10E, the function 10E executes after changing the motor generator control state from the normal control to the output restriction control in which the output is reduced. (Step S317). Thereby, the functions using the output restriction control are 10F and 10E.

If it is determined in step S315 that the temperature T of the high voltage device is equal to or lower than the start temperature T11e of the function 10E, the temperature T of the high voltage device is lower than the return temperature T32 in order to determine the degree of decrease in the temperature T of the high voltage device. Whether or not (step S316).
If it is determined in step S316 that the temperature T of the high voltage device is lower than the return temperature T32, all the functions during the output restriction control are returned to the normal control (step S331).

  When it is determined in step S316 that the temperature T of the high-voltage device is equal to or higher than the return temperature T32, only the function 10F returns to the state where the output restriction control is performed.

  Next, the HCU 10 determines whether or not the temperature T of the high-voltage device is higher than the start temperature T31d of the function 10D in order to determine whether or not there is a further temperature increase by executing various functions (step S318).

  When it is determined in step S318 that the temperature T of the high-voltage device is higher than the start temperature T31d of the function 10D, the function 10D executes after changing the motor generator control state from the normal control to the output restriction control with the output reduced. (Step S320). Thereby, the functions using the output restriction control are 10F, 10E, and 10D.

  When it is determined in step S318 that the temperature T of the high voltage device is equal to or lower than the start temperature T31d of the function 10D, the temperature T of the high voltage device is lower than the return temperature T32 in order to determine the degree of decrease in the temperature T of the high voltage device. Whether or not (step S319).

  If it is determined in step S319 that the temperature T of the high-voltage device is lower than the return temperature T32, all functions during the output restriction control are returned to the normal control (step S331).

  If it is determined in step S319 that the temperature T of the high voltage device is equal to or higher than the return temperature T32, the functions 10E and 10F return to the state where the output restriction control is performed.

  Next, the HCU 10 determines whether or not the temperature T of the high-voltage device is higher than the start temperature T31c of the function 10C in order to determine whether or not there is a further temperature increase by executing various functions (step S321).

  When it is determined in step S321 that the temperature T of the high-voltage device is higher than the start temperature T31c of the function 10C, the function 10C is executed after changing the motor generator control state from the normal control to the output restriction control in which the output is reduced. (Step S323). Thereby, the functions using the output restriction control are 10F, 10E, 10D, and 10C.

  If it is determined in step S321 that the temperature T of the high voltage device is equal to or lower than the start temperature T31c of the function 10C, the temperature T of the high voltage device is lower than the return temperature T32 in order to determine the degree of decrease in the temperature T of the high voltage device. Whether or not (step S322).

  If it is determined in step S322 that the temperature T of the high voltage device is lower than the return temperature T32, all the functions during the output restriction control are returned to the normal control (step S331).

  If it is determined in step S322 that the temperature T of the high-voltage device is equal to or higher than the return temperature T32, the functions 10D, 10E, and 10F return to the state where the output restriction control is performed.

  Next, the HCU 10 determines whether or not the temperature T of the high-voltage device is higher than the start temperature T31b of the function 10B in order to determine whether or not there is a further temperature increase by executing various functions (step S324).

  When it is determined in step S324 that the temperature T of the high-voltage device is higher than the start temperature T31b of the function 10B, the function 10B executes after changing the motor generator control state from the normal control to the output restriction control in which the output is reduced. (Step S326). Thereby, the functions using the output restriction control are 10F, 10E, 10D, 10C, and 10B.

  When it is determined in step S324 that the temperature T of the high voltage device is equal to or lower than the start temperature T31b of the function 10B, the temperature T of the high voltage device is lower than the return temperature T32 in order to determine the degree of decrease in the temperature T of the high voltage device. Whether or not (step S325).

  If it is determined in step S325 that the temperature T of the high voltage device is lower than the return temperature T32, all the functions during the output restriction control are returned to the normal control (step S331).

  When it is determined in step S325 that the temperature T of the high-voltage device is equal to or higher than the return temperature T32, the functions 10C, 10D, 10E, and 10F return to the state where the output restriction control is performed.

  Next, the HCU 10 determines whether or not the temperature T of the high-voltage device is higher than the start temperature T31a of the function 10A in order to determine whether or not there is a further temperature increase by executing various functions (step S327).

  When it is determined in step S327 that the temperature T of the high-voltage device is higher than the start temperature T31a of the function 10A, the function 10A is executed after changing the motor generator control state from the normal control to the output restriction control in which the output is reduced. (Step S329). As a result, functions using the output restriction control are 10F, 10E, 10D, 10C, 10B, and 10A.

  If it is determined in step S327 that the temperature T of the high voltage device is equal to or lower than the start temperature T31a of the function 10A, the temperature T of the high voltage device is lower than the return temperature T32 in order to determine the degree of decrease in the temperature T of the high voltage device. Whether or not (step S328).

  If it is determined in step S328 that the temperature T of the high-voltage device is lower than the return temperature T32, all functions during the output restriction control are returned to normal control (step S331).

  If it is determined in step S328 that the temperature T of the high voltage device is equal to or higher than the return temperature T32, the functions 10B, 10C, 10D, 10E, and 10F are returned to the state where the output restriction control is performed.

Step S330 relates to return control.
In step S330, it is determined whether or not the temperature T of the high voltage device is lower than the return temperature T32.

  If it is determined in step S330 that the temperature T of the high-voltage device is lower than the return temperature T32, all functions during the output restriction control are returned to the normal control (step S331).

  As a result, all functions are executed using normal control, and the flowchart of FIG. 7 ends.

  When it is determined in step S330 that the temperature T of the high-voltage device is equal to or higher than the return temperature T32, the functions 10A, 10B, 10C, 10D, 10E, and 10F are returned to the state where the output restriction control is performed.

  In FIG. 8, the output restriction control of the function 10F is first executed due to the temperature rise of the high voltage device (time f1). If the temperature rise does not stop even after executing this output restriction, the function 10E (time e1), function 10D (time d1), function 10C (time c1), function 10B (time b1), The output restriction control is executed in the order of 10A (time a1). The temperature increase is suppressed by the output restriction control of the six various functions (10A to 10F), and the temperature starts to decrease. When the temperature falls below T32a, the output restriction control of all the functions 10A to 10f is canceled and the normal control is resumed.

  The various functions using the output control of the motor generator are ranked based on the contents of the functions. Since the set temperature for executing the output limit control of the motor generator is different for each ranked function, even if the temperature of the high-voltage device rises, various functions will not execute the output limit control at the same time. It is possible to minimize the degradation of the vehicle running performance due to the output restriction. Functions that contribute to ranking and vehicle stability improvement (sliding prevention function) have a set temperature at which output restriction control is most difficult to be executed, and thus can contribute to maintaining the reliability of the vehicle. Since the threshold value when the temperature of the high-voltage device drops and returns to normal control is set to the same value for all the various functions, it can contribute to the realization of vehicle control with quick normal driving performance.

  Here, in the above-described embodiment, the case where the temperatures of the motor generator 4 and the inverter 50 are detected and compared with the restriction start temperature and the restriction release temperature will be described as an example, but the present invention is not limited thereto. For example, the operation time or stop time of the motor generator 4 or the inverter 50 is counted and compared with a map according to the ambient temperature, so that it is possible to determine the possibility of overheating or canceling the fear. Good. Also in this case, the same effect can be obtained.

  Further, in the above-described embodiment, a case where a difference between the restriction start temperature and the restriction release temperature compared with the temperatures of the motor generator 4 and the inverter 50 is described as an example, but the present invention is not limited to this. Since the temperatures of the motor generator 4 and the inverter 50 do not change suddenly, there is little possibility that the restriction and release are repeated in a short time. For this reason, the restriction start temperature and the restriction release temperature may be made the same and compared with the temperatures of the motor generator 4 and the inverter 50.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

1 vehicle (hybrid vehicle)
2 Engine (Internal combustion engine)
4 Motor generator (electric motor, generator, rotating electrical machine, power source)
10 HCU (control device, overheat judgment unit, limit control unit)
10A Slip-off prevention function (function to ensure vehicle safety, hybrid function)
10B Start performance improvement function (drivability improvement function, hybrid function)
10C Intermediate drive assist function (Drivability improvement function, hybrid function)
10D gap filling function (drivability improvement function, hybrid function)
10E Power assist function (Drivability improvement function, Hybrid function)
10F Brake regeneration function (fuel efficiency improvement function, hybrid function)
10j Overheat determination unit 10M Memory (priority holding unit)
10r Limit control unit 14 INVCM
16 High voltage BMS
23 Drive shaft (axle)
27 Differential mechanism 28 Power transmission mechanism 33 Third power storage device (high voltage battery)
34 high voltage power pack 50 inverter 75 vehicle speed sensor 76 speed sensor 77 to 79 temperature sensor

Claims (5)

A vehicle control device that is mounted on a vehicle including a rotating electrical machine that is driven by receiving power supply from a high-voltage battery via an inverter, and that controls the state of the vehicle by various functions using the rotating electrical machine. ,
An overheat determination unit that determines whether one or both of the inverter and the rotating electrical machine is in an overheat state;
Limiting control for limiting the output of the rotating electrical machine and executing a part of the functions when the overheating determining unit determines that one or both of the inverter and the rotating electrical machine are in an overheated state And a vehicle control device.   2. The vehicle control device according to claim 1, wherein the number of the functions for which the output of the rotating electrical machine is restricted by the restriction control unit is increased according to an overheating state.   The vehicle control device according to claim 1, wherein the function initially selected by the restriction control unit is a drivability improving function or an energy consumption reducing function.   The vehicle control device according to any one of claims 1 to 3, wherein a function selected last by the restriction control unit is a function of ensuring safety.   The vehicle control device according to claim 1, wherein the vehicle is a hybrid vehicle in which an internal combustion engine is added to the power source.

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