JP6323359B2 - Hybrid car - Google Patents

Description

  The present invention relates to a hybrid vehicle, and more particularly, to a hybrid vehicle including an engine, a generator, a battery, and an external power feeding device.

  Conventionally, as this type of hybrid vehicle, a vehicle including an engine, an MG (Motor Generator), a battery, and a power converter has been proposed (see, for example, Patent Document 1). The MG generates power using power from the engine and exchanges power with the battery. The power converter converts DC power of a power line connecting the MG and the battery into AC power, and supplies the AC power to an external device connected to the outlet. In this hybrid vehicle, when the remaining capacity of the battery is equal to or less than a threshold value while the vehicle is stopped, forced charging is performed to generate power by the MG using the power from the engine to charge the battery. When the power supply mode in which power is supplied to the external device by the power converter is selected and the battery input limit upper limit value is less than the threshold value, power supply to the external device by the power converter is limited (reduction of power supply power or Stop power supply). Thereby, it can suppress that the state with the low remaining capacity of a battery continues over a long time.

JP2013-183525A

  In the above-described hybrid vehicle, when the power supply mode is selected while the vehicle is stopped, the remaining battery capacity is likely to decrease during no-load operation or when the engine is stopped, compared to when the power supply mode is not selected. For this reason, when the engine is loaded and the battery is charged, the smaller the battery charge ratio, the greater the power output from the engine.If the engine is unloaded or stopped when the power supply mode is stopped, the engine When the engine is operated under load, the output from the engine and thus the charging power of the battery tends to increase. In general, when a battery has a small remaining capacity (storage ratio) or a large amount of charge power (charge current), deterioration is likely to be accelerated. It is thought that it is easy to be promoted.

  The main purpose of the hybrid vehicle of the present invention is to suppress the deterioration of the battery when power is supplied to an external device.

  The hybrid vehicle of the present invention employs the following means in order to achieve the main object described above.

The hybrid vehicle of the present invention
Engine,
A generator that generates power using power from the engine;
A battery that exchanges power via the generator and a power line;
An external power supply device for performing external power supply for supplying power from the power line to an external device;
Request power setting means for setting the required power in a tendency to increase as the storage ratio of the battery decreases as the vehicle stops,
When the required power reaches a first threshold value or more while the vehicle is stopped, the engine is stopped, or during no-load operation, the engine is loaded on the basis of the required power and the power from the engine is used. The engine and the generator are controlled to generate power by the generator, and the engine is shut down when the required power reaches a second threshold value that is equal to or lower than the first threshold value during load operation of the engine. Or control means for controlling the engine so as to be operated without load;
A hybrid vehicle comprising:
The control means is means for reducing the second threshold value when the external power feeding is performed by the external power feeding device during the stop as compared with when the external power feeding is not performed by the external power feeding device. is there,
It is characterized by that.

  In the hybrid vehicle of the present invention, the required power is set so as to increase as the battery storage ratio decreases while the vehicle is stopped. When the required power reaches the first threshold value or more during engine stoppage or no-load operation, the engine is loaded on the basis of the required power and the generator generates power using the power from the engine. And controls the engine and generator. Further, when the required power reaches less than the second threshold value that is equal to or less than the first threshold value during engine load operation, the engine is controlled such that the engine is stopped or no-load operation is performed. In such a configuration, when the vehicle is stopped and the external power supply (supplying power from the power line to the external device) is performed by the external power supply device, the second power supply is compared to the case where the external power supply is not performed. Reduce the threshold. This makes it easier to continue the engine load operation when the external power supply is performed, compared to the case where the second threshold value is set to a uniform value regardless of whether or not the external power supply is performed. It is possible to suppress a reduction in the power storage ratio of the engine, and it is possible to suppress an increase in required power when the engine is loaded. As a result, when external power feeding is performed, it is possible to suppress an increase in charging power (charging current) of the battery, and it is possible to suppress deterioration of the battery.

  In such a hybrid vehicle of the present invention, the control means, when the external power feeding is performed by the external power feeding device during the stop, compared to when the external power feeding is not performed by the external power feeding device, It is good also as what is a means to make the said 1st threshold value and the said 2nd threshold value small. By doing so, in addition to facilitating the continued load operation of the engine during external power feeding, it is possible to facilitate the load operation of the engine while the engine is stopped or during no-load operation.

  In the hybrid vehicle of the present invention, when the temperature of the battery exceeds a predetermined temperature, the control means reduces the allowable input power of the battery as compared to when the temperature of the battery is equal to or lower than the predetermined temperature. And the control means, when the external power feeding is performed by the external power feeding device while the vehicle is stopped, when the allowable input power of the battery becomes smaller than a predetermined power, It is good also as a means to restrict | limit. In the hybrid vehicle of the present invention, as described above, when external power feeding is being performed while the vehicle is stopped, the second threshold value is made smaller than when no external power feeding is performed, so that external power feeding is performed. In addition, the battery storage ratio is suppressed from decreasing and the required power is increased when the engine is loaded, so that the battery temperature increase is suppressed and the external power supply is restricted from being restricted. be able to.

  Furthermore, in the hybrid vehicle of the present invention, the control means is configured to request the power supply according to a charge / discharge request power of the battery based on the power storage ratio when the external power supply device does not perform the external power supply while the vehicle is stopped. When power is set and the external power feeding is performed by the external power feeding device, the power demand may be a means for setting the required power according to the charge / discharge required power and the power of the external power feeding.

1 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 20 as an embodiment of the present invention. It is explanatory drawing which shows an example of the relationship between battery temperature Tb of the battery 50, and basic input / output restrictions Wintmp, Wouttmp. It is explanatory drawing which shows an example of the relationship between the electrical storage ratio SOC of the battery 50, and the correction coefficients kin and kout. It is a flowchart which shows an example of the control routine at the time of parking performed by HVECU70 of an Example. It is explanatory drawing which shows an example of the relationship between the electrical storage ratio SOC of the battery 50, and charging / discharging request | requirement power Pb *. It is a flowchart which shows an example of the threshold value setting routine performed by HVECU70 of an Example.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a configuration diagram showing an outline of the configuration of a hybrid vehicle 20 as an embodiment of the present invention. As shown in the figure, the hybrid vehicle 20 of the embodiment includes an engine 22, a planetary gear 30, motors MG1 and MG2, inverters 41 and 42, a battery 50, an external power supply device 60, a hybrid electronic control unit (hereinafter referred to as a hybrid electronic control unit). , “HVECU”) 70.

  The engine 22 is configured as an internal combustion engine that outputs power using gasoline or light oil as a fuel. The operation of the engine 22 is controlled by an engine electronic control unit (hereinafter referred to as “engine ECU”) 24.

  Although not shown, the engine ECU 24 is configured as a microprocessor centered on a CPU, and includes a ROM for storing a processing program, a RAM for temporarily storing data, an input / output port, and a communication port in addition to the CPU. . Signals from various sensors necessary for controlling the operation of the engine 22 are input to the engine ECU 24 from an input port. Examples of signals from various sensors include the following. A crank angle θcr from a crank position sensor 23 that detects the rotational position of the crankshaft 26 of the engine 22. The throttle opening TH from the throttle valve position sensor that detects the throttle valve position. Various control signals for controlling the operation of the engine 22 are output from the engine ECU 24 through an output port. Examples of various control signals include the following. Control signal to the fuel injection valve. Control signal to the throttle motor that adjusts the throttle valve position. Control signal to the ignition coil integrated with the igniter. The engine ECU 24 is connected to the HVECU 70 via a communication port. The engine ECU 24 controls the operation of the engine 22 by a control signal from the HVECU 70. Further, the engine ECU 24 outputs data relating to the operating state of the engine 22 to the HVECU 70 as necessary. The engine ECU 24 calculates the rotation speed of the crankshaft 26, that is, the rotation speed Ne of the engine 22 based on the crank angle θcr from the crank position sensor 23.

  The planetary gear 30 is configured as a single pinion type planetary gear mechanism. The sun gear of planetary gear 30 is connected to the rotor of motor MG1. The ring gear of the planetary gear 30 is connected to a drive shaft 36 that is coupled to the drive wheels 38 a and 38 b via a differential gear 37. A crankshaft 26 of the engine 22 is connected to the carrier of the planetary gear 30.

  The motor MG1 is configured as a synchronous generator motor, for example. As described above, the motor MG1 has a rotor connected to the sun gear of the planetary gear 30. The motor MG2 is configured as, for example, a synchronous generator motor. The motor MG2 has a rotor connected to the drive shaft 36. The inverters 41 and 42 are connected to the power line 54 together with the battery 50. The motors MG1 and MG2 are driven to rotate by switching control of a plurality of switching elements (not shown) of the inverters 41 and 42 by a motor electronic control unit (hereinafter referred to as “motor ECU”) 40.

  Although not shown, the motor ECU 40 is configured as a microprocessor centered on a CPU, and includes a ROM for storing a processing program, a RAM for temporarily storing data, an input / output port, and a communication port in addition to the CPU. . Signals from various sensors necessary for driving and controlling the motors MG1, MG2 are input to the motor ECU 40 via the input port. Examples of signals from various sensors include the following. Rotation positions θm1 and θm2 from rotation position detection sensors 43 and 44 that detect the rotation positions of the rotors of the motors MG1 and MG2. Phase current from a current sensor that detects current flowing in each phase of motors MG1 and MG2. The motor ECU 40 outputs a switching control signal to a switching element (not shown) of the inverters 41 and 42 through an output port. The motor ECU 40 is connected to the HVECU 70 via a communication port. The motor ECU 40 controls driving of the motors MG1 and MG2 by a control signal from the HVECU 70. In addition, motor ECU 40 outputs data relating to the driving state of motors MG1 and MG2 to HVECU 70 as necessary. The motor ECU 40 calculates the rotational speeds Nm1, Nm2 of the motors MG1, MG2 based on the rotational positions θm1, θm2 of the rotors of the motors MG1, MG2 from the rotational position detection sensors 43, 44.

  The battery 50 is configured as a lithium ion secondary battery. The lithium ion secondary battery has a characteristic that deterioration is more easily promoted as the storage ratio SOC during charging is lower and the charging power (charging current) is larger. As described above, the battery 50 is connected to the power line 54 together with the inverters 41 and 42. The battery 50 is managed by a battery electronic control unit (hereinafter referred to as “battery ECU”) 52.

  Although not shown, the battery ECU 52 is configured as a microprocessor centered on a CPU, and includes a ROM for storing a processing program, a RAM for temporarily storing data, an input / output port, and a communication port in addition to the CPU. . Signals from various sensors necessary for managing the battery 50 are input to the battery ECU 52 via the input port. Examples of signals from various sensors include the following. The battery voltage Vb from the voltage sensor 51a installed between the terminals of the battery 50. Battery current Ib from the current sensor 51b attached to the output terminal of the battery 50 (a positive value when discharging from the battery 50). The battery temperature Tb from the temperature sensor 51c attached to the battery 50. The battery ECU 52 is connected to the HVECU 70 via a communication port. The battery ECU 52 outputs data relating to the state of the battery 50 to the HVECU 70 as necessary. The battery ECU 52 calculates the storage ratio SOC based on the integrated value of the battery current Ib from the current sensor 51b. The storage ratio SOC is a ratio of the capacity of power that can be discharged from the battery 50 to the total capacity of the battery 50. Further, the battery ECU 52 calculates the input / output limits Win, Wout based on the calculated storage ratio SOC and the battery temperature Tb from the temperature sensor 51c. The input / output limits Win and Wout are the maximum allowable power that may charge / discharge the battery 50.

  The input / output limits Win and Wout of the battery 50 can be set as follows. First, based on the battery temperature Tb of the battery 50, basic input / output limits Wintmp, Wouttmp are set as basic values of the input / output limits Win, Wout. An example of the relationship between the battery temperature Tb of the battery 50 and the basic input / output limits Wintmp, Wouttmp is shown in FIG. Subsequently, correction coefficients kin and kout are set based on the storage ratio SOC of the battery 50. An example of the relationship between the storage ratio SOC of the battery 50 and the correction coefficients kin and kout is shown in FIG. Then, the basic input / output limits Wintmp, Wouttmp are multiplied by the correction coefficients kin, kout to calculate the input / output limits Win, Wout.

  As shown in FIG. 2, the basic input / output limits Wintmp, Wouttmp are set as follows. In the basic input / output limits Wintmp and Wouttmp, predetermined power (−W1) and W1 are set in a region where the battery temperature Tb is equal to or lower than a predetermined temperature Tb1 (for example, 45 ° C., 50 ° C., 55 ° C., etc.). Further, in the basic input / output limits Wintmp and Wouttmp, in the region where the battery temperature Tb is higher than the predetermined temperature Tb1, the absolute value decreases from the predetermined power W1 toward the value 0 and becomes constant at the value 0 as the battery temperature Tb increases. Is set.

  As shown in FIG. 3, the correction coefficients kin and kout are set as follows. The correction coefficient kin is set to a value of 1 in a region where the storage ratio SOC is equal to or less than a predetermined ratio Shi1 (for example, 78%, 80%, 82%, etc.). Further, the correction coefficient kin is set to a value that becomes smaller from the value 1 toward the value 0 and becomes constant at the value 0 as the power storage ratio SOC increases in a region where the power storage ratio SOC is larger than the predetermined ratio Shi1. The correction coefficient kout is set to a value of 1 in a region where the power storage rate SOC is equal to or higher than a predetermined rate Slo1 (for example, 28%, 30%, 32%, etc.). In addition, the correction coefficient kout is set to a value that decreases from the value 1 toward the value 0 and becomes constant at the value 0 as the power storage rate SOC decreases in a region where the power storage rate SOC is less than the predetermined rate Slo1.

  Therefore, the input limit Win is a value (−W1) in a region where the battery temperature Tb is equal to or lower than the predetermined temperature Tb1 and the power storage rate SOC is equal to or lower than the predetermined rate Shi1. Further, the input limit Win decreases as the battery temperature Tb increases in a region where the battery temperature Tb is higher than the predetermined temperature Tb1 or as the storage rate SOC increases in a region where the power storage rate SOC is higher than the predetermined rate Shi1. The output limit Wout is a value W1 in a region where the battery temperature Tb is equal to or lower than the predetermined temperature Tb1 and the storage rate SOC is equal to or higher than the predetermined rate Slo1. Further, the output limit Wout decreases as the battery temperature Tb increases in a region where the battery temperature Tb is higher than the predetermined temperature Tb1 or as the storage rate SOC decreases in a region where it is smaller than the predetermined rate Slo1.

  The external power supply device 60 is connected to the power line 54 and an outlet 64 for connecting an external device that is not a component of the vehicle. Although not shown, the external power supply device 60 includes an inverter. The inverter converts the DC power of the power line 54 into AC power having a desired voltage (for example, AC 100V power), and supplies the AC power to an external device connected to the outlet 64. Hereinafter, supplying power from the power line 54 to an external device is referred to as “external power supply”. In this inverter, a plurality of switching elements (not shown) are subjected to switching control by the HVECU 70.

  Although not shown, the HVECU 70 is configured as a microprocessor centered on a CPU, and includes a ROM for storing a processing program, a RAM for temporarily storing data, an input / output port, and a communication port in addition to the CPU. Signals from various sensors are input to the HVECU 70 via input ports. Examples of signals from various sensors include the following. Feed power Ph from the power sensor 62 that detects the feed power of the external feed by the external feed device 60. An ignition signal from the ignition switch 80. A shift position SP from the shift position sensor 82 that detects the operation position of the shift lever 81. Accelerator opening degree Acc from the accelerator pedal position sensor 84 that detects the depression amount of the accelerator pedal 83. The brake pedal position BP from the brake pedal position sensor 86 that detects the amount of depression of the brake pedal 85. Vehicle speed V from the vehicle speed sensor 88. A switching control signal to the switching element of the inverter of the external power supply device 60 is output from the HVECU 70 via the output port. As described above, the HVECU 70 is connected to the engine ECU 24, the motor ECU 40, and the battery ECU 52 via the communication port. The HVECU 70 exchanges various control signals and data with the engine ECU 24, the motor ECU 40, and the battery ECU 52.

  In the hybrid vehicle 20 of the embodiment, the shift position SP detected by the shift position sensor 82 includes a parking position (P position) used during parking, a reverse position (R position) for reverse travel, and a neutral position ( N position) and forward drive position (D position). When the shift position SP is the P position, the driving wheels 38a and 38b are locked by a parking lock mechanism (not shown).

In the hybrid vehicle 20 of the embodiment thus configured, when the shift position SP is the D position or the R position, the required driving force of the drive shaft 36 is set based on the accelerator opening Acc and the vehicle speed V, and the required driving force is set. The engine 22 and the motors MG1 and MG2 are controlled to operate so that the required required power is output to the drive shaft 36. The operation modes of the engine 22 and the motors MG1, MG2 include the following modes (1) to (3).
(1) Torque conversion operation mode: The engine 22 is operated and controlled so that power corresponding to the required power is output from the engine 22, and all of the power output from the engine 22 is transmitted to the planetary gear 30 and the motors MG1 and MG2. Is a mode in which the motors MG1 and MG2 are driven and controlled so that the torque is converted by the motor and the required power is output to the drive shaft.
(2) Charging / discharging operation mode: The engine 22 is operated and controlled so that the power corresponding to the sum of the required power and the power required for charging / discharging the battery 50 is output from the engine 22, and the power output from the engine 22 is also controlled. Is a mode in which the motor MG1 and MG2 are driven and controlled so that the required power is output to the drive shaft 36 after torque conversion is performed by the planetary gear 30 and the motors MG1 and MG2 with charging / discharging of the battery 50. .
(3) Motor operation mode: Mode in which the operation of the engine 22 is stopped and the motor MG2 is driven and controlled so that the required power is output to the drive shaft 36.

  In the hybrid vehicle 20 of the embodiment, the HVECU 70 controls the external power supply device 60 to perform external power supply when the external power supply condition is satisfied. The external power supply condition is satisfied when an external device is connected to the outlet 64 and the shift position SP is at the P position and an external power supply instruction is issued. The external power supply instruction is performed, for example, when a switch for external power supply is turned on by a user. Further, the external power supply is stopped when the battery temperature Tb of the battery 50 rises and the absolute values of the input / output limits Win and Wout of the battery 50 become less than the predetermined power W2 that is equal to or less than the predetermined power W1.

  Next, the operation of the hybrid vehicle 20 of the embodiment thus configured, particularly the operation when the shift position SP is the P position will be described. FIG. 4 is a flowchart illustrating an example of a parking control routine executed by the HVECU 70 of the embodiment. This routine is repeatedly executed when the shift position SP is the P position.

  When the parking control routine is executed, the HVECU 70 first inputs the storage ratio SOC of the battery 50 (step S100), and based on the input storage ratio SOC of the battery 50, the charge / discharge required power Pb * of the battery 50 is obtained. (When discharging from the battery 50 is a positive value) is set (step S110).

  Here, as the storage ratio SOC of the battery 50, a value calculated by the battery ECU 52 is input by communication. In the embodiment, the charge / discharge required power Pb * is determined in advance by storing the relationship between the storage ratio SOC of the battery 50 and the charge / discharge request power Pb * in a ROM (not shown) as a map. Then, the corresponding charge / discharge required power Pb * is derived from this map and set. FIG. 5 is an explanatory diagram showing an example of the relationship between the storage ratio SOC of the battery 50 and the required charge / discharge power Pb *. The charge / discharge required power Pb * of the battery 50 is set as follows as shown in the figure. When the storage ratio SOC of the battery 50 is the target ratio SOC * (for example, 55%, 60%, 65%, etc.), the charge / discharge request power Pb * is set to a value of 0. In a region where the storage ratio SOC is larger than the target ratio SOC * and smaller than a predetermined ratio Shi2 (for example, 73%, 75%, 77%, etc.), the charge / discharge required power Pb * increases as the storage ratio SOC increases. A value that tends to increase toward a predetermined power Pdis (for example, +4 kW, +4.5 kW, +5 kW, etc.) is set. The predetermined ratio Shi2 is a value smaller than the above-mentioned predetermined ratio Shi1, and the predetermined power Pdis is a value equal to or less than the above-mentioned predetermined power W1. In the region where the storage ratio SOC is equal to or higher than the predetermined ratio Shi2, the predetermined power Pdis is set as the charge / discharge request power Pb *. In a region where the power storage rate SOC is smaller than the target rate SOC * and larger than a predetermined rate Slo2 (for example, 38%, 40%, 42%, etc.), the charge / discharge required power Pb * decreases as the power storage rate SOC decreases. A value that tends to decrease toward a predetermined power Pch (for example, -4 kW, -4.5 kW, -5 kW, etc.) is set. The predetermined ratio Slo2 is larger than the above-described predetermined ratio Slo1, and the predetermined power Pch is a value equal to or higher than the above-described predetermined power (−W1). In the region where the storage ratio SOC is equal to or less than the predetermined ratio Slo2, the predetermined power Pch is set as the charge / discharge request power Pb *. If the battery 50 is charged / discharged with the charge / discharge required power Pb * set in this way, the storage ratio SOC of the battery 50 can be brought close to the target ratio SOC *.

  Next, it is determined whether or not external power feeding is performed by the external power feeding device 60 (step S120). When it is determined that external power feeding is not performed, a value (-Pb *) obtained by inverting the sign of the charge / discharge required power Pb * of the battery 50 is set as the required power Pe * of the engine 22 (step S130). . On the other hand, when it is determined that the external power supply is being performed, the sum of the value (−Pb *) and the externally supplied power Ph from the power sensor 62 is set as the required power Pe * of the engine 22 (step S1). S140).

  When the required power Pe * is thus set, it is determined whether the engine 22 is under load operation or stopped (step S150), and when it is determined that the engine 22 is stopped, the required power Pe * is compared with a threshold value Pst. (Step S160). Here, the threshold value Pst is used for determining whether to stop the operation of the engine 22 or to start the engine 22 (load operation). In the embodiment, the threshold value Pst is a value set by a threshold setting routine described later. Was used.

  When the required power Pe * is less than the threshold value Pst in step S160, this routine is finished as it is. In this case, the operation stop of the engine 22 is continued.

  When the required power Pe * is greater than or equal to the threshold value Pst in step S160, the engine 22 is started (step S170). Here, the engine 22 is started by cranking the engine 22 by the motor MG1 under the cooperative control of the HVECU 70, the engine ECU 24, and the motor ECU 40, and the rotation speed Ne of the engine 22 is a predetermined rotation speed (for example, 800 rpm, 900 rpm, 1000 rpm). Etc.) When the above is reached, operation control (fuel injection control or ignition control) of the engine 22 is started.

  When the engine 22 is started in this way, the engine 22 and the motor MG1 are controlled using the required power Pe * (step S190), and this routine is finished. In this case, the HVECU 70 sets the target rotational speed Ne * and the target torque Te * of the engine 22 using the required power Pe * and an operation line for efficiently operating the engine 22 (for example, an optimum fuel efficiency operation line). To do. Subsequently, the torque command Tm1 * of the motor MG1 is obtained by the rotational speed feedback control so that the rotational speed Ne of the engine 22 becomes the target rotational speed Ne * within the range of the input / output limits Win and Wout of the battery 50. Set. This torque command Tm1 * is basically a torque in a direction to hold down the rotational speed Ne of the engine 22. Therefore, the motor MG1 basically functions as a generator. When the target rotational speed Ne * and target torque Te * of the engine 22 and the torque command Tm1 * of the motor MG1 are set in this way, the target rotational speed Ne * and target torque Te * of the engine 22 are transmitted to the engine ECU 24 and the motors MG1, MG2 torque commands Tm1 * and Tm2 * are transmitted to the motor ECU 40. When the engine ECU 24 receives the target rotational speed Ne * and the target torque Te * of the engine 22, the intake air of the engine 22 is operated so that the engine 22 is operated based on the received target rotational speed Ne * and the target torque Te *. Perform quantity control, fuel injection control, ignition control, etc. When motor ECU 40 receives torque commands Tm1 * and Tm2 * of motors MG1 and MG2, motor ECU 40 performs switching control of switching elements of inverters 41 and 42 so that motors MG1 and MG2 are driven by torque commands Tm1 * and Tm2 *. .

  By such control, when external power feeding is not performed by the external power feeding device 60, the required power Pe * (= −Pb *) is output from the engine 22, and the electric power corresponding to the required power Pe * is generated by the motor MG1, Electric power generated by motor MG1 is supplied to battery 50. On the other hand, when external power feeding is performed by the external power feeding device 60, the required power Pe * (= −Pb * + Ph) is output from the engine 22 and the electric power corresponding to the required power Pe * is generated by the motor MG1 to generate the motor. The electric power generated by MG1 is supplied to the battery 50 and the external device.

  When the load operation of the engine 22 is started, the next time this routine is executed, it is determined in step S150 that the engine 22 is in the load operation, and the required power Pe * is compared with a threshold value Psp that is smaller than the threshold value Pst. (Step S180). Here, the threshold value Psp is used to determine whether to continue the load operation of the engine 22 or to stop the operation of the engine 22. In the embodiment, the threshold value Psp is set by a threshold setting routine described later in the same manner as the threshold value Pst. A value was assumed to be entered. The threshold value Psp is set to a value smaller than the threshold value Pst in order to suppress frequent start (load operation) and stop of the engine 22.

  When the required power Pe * is equal to or greater than the threshold value Psp in step S180, the engine 22 and the motor MG1 are controlled using the required power Pe * (step S190), and this routine is terminated. In this case, the load operation of the engine 22 is continued.

  When the required power Pe * is less than the threshold value Psp in step S180, the operation of the engine 22 is stopped (step S200), and this routine is terminated. When the operation of the engine 22 is stopped in this way, the next time this routine is executed, it is determined in step S150 that the engine 22 is stopped, and the processing after step S160 is executed as described above.

  Next, processing for setting the thresholds Pst and Psp used in the parking control routine of FIG. 4 will be described. FIG. 6 is a flowchart illustrating an example of a threshold setting routine executed by the HVECU 70 of the embodiment. This routine is executed repeatedly.

  When the threshold setting routine is executed, the HVECU 70 first determines whether or not external power feeding is being performed by the external power feeding device 60 (step S300). When it is determined that the external power supply is not performed, the predetermined value Pst1 is set to the threshold value Pst and the predetermined value Psp1 smaller than the predetermined value Pst1 is set to the threshold value Psp (step S310), and this routine is finished. . On the other hand, when it is determined that external power feeding is being performed, the threshold value Pst is set to a predetermined value Pst2 smaller than the predetermined value Pst1, and the threshold value Psp is set to the predetermined value Psp1 and the predetermined value Psp2 smaller than the predetermined value Pst2. (Step S320), this routine is finished. Here, the predetermined values Pst1, Psp1, Pst2, and Psp2 are positive values equal to or less than values (−Pch) obtained by inverting the sign of the predetermined power Pch (for example, −4 kW, −4.5 kW, −5 kW, and the like). A value is used. For example, 3.5 kW, 4 kW or the like is used as the predetermined value Pst1, a value about 1 kW smaller than the predetermined value Pst1 is used as the predetermined value Psp1, and 2 kW, 2, 5 kW, or the like is used as the predetermined value Pst2. As the predetermined value Psp2, a value about 1 kW smaller than the predetermined value Pst2 is used.

  As described above, when the external power supply is not performed, the predetermined value Psp1 is set as the threshold value Psp, and when the external power supply is performed, the predetermined value Psp2 smaller than the predetermined value Psp1 is set as the threshold value Psp. Regardless of whether or not the threshold value Psp is set to the predetermined value Psp1, the load operation of the engine 22 can be easily continued when external power feeding is performed. Whether the external power supply is performed by setting the predetermined value Pst1 to the threshold value Pst when the external power supply is not being performed, and setting the predetermined value Pst2 smaller than the predetermined value Pst1 to the threshold value Pst when the external power supply is being performed. Regardless of whether or not the threshold value Pst is set to the predetermined value Pst1, the engine 22 can be easily started during the operation stop of the engine 22 when external power feeding is performed, and the engine 22 is loaded. It can make it easier to drive. When the external power supply is performed, the storage rate SOC of the battery 50 is likely to decrease during the stop of the operation of the engine 22 as compared to when the external power supply is not performed. In this way, the threshold values Pst and Psp are set. As a result, it is possible to suppress a decrease in the storage ratio SOC of the battery 50, and it is possible to suppress an increase in the charge / discharge required power Pb * and thus the required power Pe * when the engine 22 is loaded. As a result, since it is possible to suppress an increase in the charging power (charging current) of the battery 50 when performing external power feeding, it is possible to suppress the deterioration of the battery 50 from being promoted, The temperature rise of the battery 50 can be suppressed. And by suppressing the temperature rise of the battery 50, it is possible to suppress the absolute values of the input / output limits Win and Wout of the battery 50 from being less than the predetermined power W2, and to suppress the external power supply from being stopped. be able to.

  In the hybrid vehicle 20 of the embodiment described above, when external power feeding is not performed, a predetermined value Psp1 is set as the threshold value Psp used for determining whether to continue the load operation of the engine 22 or to stop the operation of the engine 22, When power is being supplied, a predetermined value Psp2 smaller than the predetermined value Psp1 is set as the threshold value Psp. Further, when external power feeding is not performed, a predetermined value Pst1 is set to a threshold value Pst used for determining whether to stop operation of the engine 22 or to start the engine 22 (load operation), and external power feeding is performed. Sometimes, a predetermined value Pst2 smaller than the predetermined value Pst1 is set as the threshold value Pst. As a result, it is possible to suppress a decrease in the storage ratio SOC of the battery 50 during external power feeding, and the required charge / discharge power Pb * and thus the required power Pe * are large when the engine 22 is loaded. It can be suppressed. As a result, when external power feeding is performed, it is possible to suppress the charging power (charging current) of the battery 50 from increasing, and it is possible to suppress the deterioration of the battery 50 from being promoted.

  In the hybrid vehicle 20 of the embodiment, when the required power Pe * reaches less than the threshold value Psp during the load operation of the engine 22, the engine 22 is stopped, and when the required power Pe * reaches the threshold value Pst or more while the engine 22 is stopped. The engine 22 was started and the load operation was started. However, when the required power Pe * reaches less than the threshold value Psp during the load operation of the engine 22, the operation of the engine 22 is shifted from the load operation to the no load operation (idle operation), and the required power during the no load operation of the engine 22 is reached. When Pe * reaches or exceeds the threshold value Pst, the operation of the engine 22 may be shifted from no-load operation to load operation.

  In the hybrid vehicle 20 of the example, the threshold value Psp is set to a value smaller than the threshold value Pst. However, the threshold value Psp may be the same value as the threshold value Pst. In this case, when the external power supply is not performed, both the threshold values Pst and Psp are set to a predetermined value Pst1, and when the external power supply is performed, both the threshold values Pst and Psp are set to a predetermined value Pst2 smaller than the predetermined value Pst1. Also good.

  In the hybrid vehicle 20 of the embodiment, when external power feeding is not performed, the predetermined values Pst1 and Psp1 are set to the threshold values Pst and Psp, respectively, and when external power feeding is performed, the predetermined values Pst1 and Psp1 are respectively set to the threshold values Pst and Psp. Predetermined values Pst2 and Psp2 smaller than those are set. However, the threshold value Pst may be set to the predetermined value Pst1 regardless of whether or not external power feeding is performed. Even in this case, similarly to the embodiment, when the external power supply is not performed, the predetermined value Psp1 is set to the threshold value Psp, and when the external power supply is performed, the predetermined value Psp2 is set to the threshold value Psp. Regardless of whether or not the threshold value Psp is set to the predetermined value Psp1, the load operation of the engine 22 can be easily continued during external power feeding.

  In the hybrid vehicle 20 of the embodiment, when the external power supply is performed when the shift position SP is the P position, the threshold values Pst and Psp are set to values smaller than those when the external power supply is not performed. However, when the shift position SP is at the P position and the external power supply is performed, if the deterioration of the battery 50 is not promoted, the threshold values Pst and Psp are set to the same values as when the external power supply is not performed. It is good. Here, when deterioration of the battery 50 is not promoted, normal conditions are used, such as when the battery temperature Tb is within a predetermined temperature range, or when the number of charge / discharge cycles from the time of shipment from the factory is a predetermined number of times or less. be able to.

  In the hybrid vehicle 20 of the embodiment, the absolute values of the input and output limits Win and Wout of the battery 50 are less than the predetermined power W2 that is equal to or less than the predetermined power W1 when external power feeding is performed when the shift position SP is the P position. When this happens, the external power supply is stopped. However, instead of stopping the external power supply, the power of the external power supply may be reduced to continue the external power supply. Further, the external power supply may not be stopped or the power of the external power supply may not be reduced, that is, the external power supply may not be limited.

  In the hybrid vehicle 20 of the embodiment, when the battery 50 is charged at the shift position SP at the P position and the external power is being supplied, a value obtained by inverting the sign of the charge / discharge required power Pb * of the battery 50 (−Pb *) And the externally supplied power Ph from the power sensor 62 are set to the required power Pe * of the engine 22. However, the required power Pe of the engine 22 is calculated by the following equation (1) using the charge / discharge required power Pb * of the battery 50 and the actual charge / discharge power Pb without using the power supply Ph of the external power supply from the power sensor 62. * May be set. Here, as the actual charge / discharge power Pb of the battery 50, the product of the battery voltage Vb from the voltage sensor 51a and the battery current Ib from the current sensor 51b can be used. Expression (1) is a relational expression in feedback control for canceling the difference between the charge / discharge required power Pb * and the actual charge / discharge power Pb. In equation (1), “kp” is the gain of the proportional term.

  Pe * = − Pb * + kp ・ (Pb * −Pb) (1)

  In the hybrid vehicle 20 of the embodiment, external power feeding is allowed when the shift position SP is the P position. However, external power supply may be allowed regardless of the shift position SP as long as the vehicle is stopped. It can be considered that the vehicle is stopped when the shift position SP is a position other than the P position when the vehicle speed V is 0 and the brake pedal 85 is depressed.

  In the hybrid vehicle 20 of the embodiment, the external power supply condition (the condition that is satisfied when an external device is connected to the outlet 64 and the shift position SP is in the P position and the external power supply is instructed) is satisfied. The external power feeding device 60 is controlled when the power is on. However, external power supply may be automatically performed when the shift position SP is the P position and an external device is connected to the outlet 64. In other words, as a condition for external power supply, it may not be necessary to instruct external power supply.

  In the hybrid vehicle 20 of the embodiment, the battery 50 is configured as a lithium ion secondary battery. However, the battery 50 may be configured as a nickel hydride secondary battery.

  In the embodiment, the configuration of the hybrid vehicle 20 including the engine 22, the planetary gear 30, the motors MG1 and MG2, the battery 50, and the external power supply device 60 has been described. However, an engine, a generator that generates power using power from the engine, a battery that exchanges power via the generator and the power line, and an external power supply device that performs external power supply that supplies power from the power line to external devices The configuration of the other hybrid vehicle may be used.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the engine 22 corresponds to “engine”, the motor MG1 corresponds to “generator”, the battery 50 corresponds to “battery”, the external power supply device 60 corresponds to “external power supply device”, and the HVECU 70 Corresponds to “required power setting means”, and the HVECU 70, the engine ECU 24, and the motor ECU 40 correspond to “control means”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the manufacturing industry of hybrid vehicles.

  20 hybrid vehicle, 22 engine, 23 crank position sensor, 24 engine electronic control unit (engine ECU), 26 crankshaft, 30 planetary gear, 36 drive shaft, 37 differential gear, 38a, 38b drive wheel, 39a, 39b wheel, 40 Motor electronic control unit (motor ECU), 41, 42 Inverter, 43, 44 Rotation position detection sensor, 50 battery, 51a Voltage sensor, 51b Current sensor, 51c Temperature sensor, 52 Battery electronic control unit (battery ECU), 54 Power line, 60 External power supply device, 62 Power sensor, 64 outlet, 70 Electronic control unit for hybrid (HVECU), 80 Ignition switch, 81 Shift lever, 82 Shift positive Sensor, 83 accelerator pedal, 84 accelerator pedal position sensor, 85 brake pedal, 86 brake pedal position sensor, 88 vehicle speed sensor, MG1, MG2 motor.

Claims (1)

Engine,
A generator that generates power using power from the engine;
A battery that exchanges power via the generator and a power line;
An external power supply device for performing external power supply for supplying power from the power line to an external device;
Request power setting means for setting the required power in a tendency to increase as the storage ratio of the battery decreases as the vehicle stops,
When the required power reaches a first threshold value or more while the vehicle is stopped, the engine is stopped, or during no-load operation, the engine is loaded on the basis of the required power and power from the engine The engine and the generator are controlled to generate power by the generator, and the engine is shut down when the required power reaches a second threshold value that is equal to or lower than the first threshold value during load operation of the engine Or control means for controlling the engine so as to be operated without load;
A hybrid vehicle comprising:
The control means is means for reducing the second threshold value when the external power feeding is performed by the external power feeding device during the stop as compared with when the external power feeding is not performed by the external power feeding device. Oh it is,
Further, the control means may be configured such that when the external power feeding is performed by the external power feeding device while the vehicle is stopped, deterioration of the battery is not promoted, and when the external power feeding is not performed by the external power feeding device and Means for making the second threshold the same;
A hybrid vehicle characterized by that.

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