JP2022187844A - Power generation system control method and power generation system control device - Google Patents

Abstract

To provide a power generation system control method and a power generation system control device for protecting a power generation system from damage caused by excessive output of a power source.SOLUTION: The power generation system control method is for controlling a power generation system 12 having an engine 17, a generator 18, and a power transmission mechanism 19. In this power generation system control method, an estimated value of damper torque Tdmp^, which is an estimate of damper torque Tdmp generated by the power transmission mechanism 19, is calculated on the basis of a generator torque command value TG2* and a rotation speed ωG, which represents the rotation state of the generator 18. Further, on the basis of the estimated damper torque Tdmp^, a first and/or second protection control is executed as an output control to restrict the output of the engine 17, the generator 18, or both the engine 17 and generator 18.SELECTED DRAWING: Figure 5

Description

The present invention relates to a control method and a control device for a power generation system that generates power by driving a generator with power generated by a power source.

Patent Literature 1 describes a large-scale power generation system used in industrial plants or the like, in which a prime mover and a power generator are connected by a speed reducer and a friction clutch. In this power generation system, slipping of the friction clutch protects the power transmission system and prime mover from excessive torque input.

Japanese Unexamined Patent Application Publication No. 2001-169508

However, when the prime mover, which is the power source of the generator, is connected to the generator via the friction clutch, there is a problem that the power generation system becomes large. For example, a power generation system mounted on an electric vehicle or the like is required to be downsized, and a configuration in which a power source and a generator are almost directly connected may be adopted. And such a small power generation system does not protect the power generation system against excessive power output of the power source. As a result, there is a risk that the power transmission mechanism or the like that connects the power source and the electric motor will be damaged.

SUMMARY OF THE INVENTION An object of the present invention is to provide a power generation system control method and a power generation system control device that protect the power generation system from damage due to excessive output of a power source without requiring a configuration that enlarges the power generation system.

One aspect of the present invention is a power generation system control method for controlling a power generation system having a power source that generates power, a generator that generates power using the power, and a power transmission mechanism that transmits power to the power generator. In this power generation system control method, the transmission mechanism torque estimation, which is an estimated value of the torque generated in the power transmission mechanism, is based on the generator torque command value that commands the torque to be generated by the generator and the rotation state of the generator. value is computed. Output limiting is then performed to limit the output of the power source, the generator, or both the power source and the generator based on the transmission mechanism torque estimate.

According to the present invention, it is possible to provide a power generation system control method and a power generation system control device that protect the power generation system from damage due to excessive output of a power source or the like without requiring a configuration that enlarges the power generation system.

FIG. 1 is an explanatory diagram showing a schematic configuration of an electric vehicle. FIG. 2 is a graph showing power transmission characteristics of the power transmission mechanism. FIG. 3 is a block diagram showing the configuration of the generator controller. FIG. 4 is a block diagram showing the configuration of the generator torque command value calculator. FIG. 5 is a block diagram showing the configuration of the protection control section. FIG. 6 is a block diagram showing the configuration of the engine controller. FIG. 7 is a flow chart showing the action of the power generation system control method. FIG. 8 is a flow chart showing a specific evaluation method of the damper torque estimated value in excessive torque detection. FIG. 9 is a timing chart showing the action of the first protection control that limits the engine torque. FIG. 10 is a timing chart showing the action of the second protection control that limits the generator torque. FIG. 11 is a block diagram showing the configuration of a protection control unit according to the second embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First embodiment]
FIG. 1 is an explanatory diagram showing a schematic configuration of an electric vehicle 100. As shown in FIG. As shown in FIG. 1 , an electric vehicle 100 is a vehicle driven by electric power of a battery 10 and includes a drive motor 11 and a power generation system 12 .

Battery 10 stores electric power for driving each part of electric vehicle 100 . Battery 10 is rechargeable. In this embodiment, the battery 10 is charged with at least the power generated by the power generation system 12 . In this embodiment, the battery 10 is a DC power supply. A DC voltage output by the battery 10 (hereinafter referred to as battery voltage _Vdc ) can be detected.

Drive motor 11 is an electric motor for driving electric vehicle 100 , and generates driving force for electric vehicle 100 using electric power of battery 10 . In this embodiment, the drive motor 11 is a three-phase AC motor.

The drive motor 11 is connected to a drive shaft 14 via a reduction gear 13 and the like. A drive wheel 15 is connected to the drive shaft 14 . Therefore, the torque generated at the output shaft of drive motor 11 generates driving force for electric vehicle 100 at drive wheels 15 via reduction gear 13 and the like. Further, when the electric vehicle 100 decelerates, the drive motor 11 converts the kinetic energy of the electric vehicle 100 into electric energy by so-called regenerative control. A part or all of the electric power obtained during regeneration control can be charged to the battery 10 .

Drive motor 11 is connected to battery 10 via drive inverter 16 . The drive inverter 16 is an inverter for the drive motor 11 , converts the DC power output by the battery 10 into AC power, and supplies the AC power to the drive motor 11 . During regeneration control, the drive inverter 16 converts AC power generated by the drive motor 11 into DC power.

The power generation system 12 is a system that generates power for charging the battery 10 . That is, the electric vehicle 100 of the present embodiment is a so-called series hybrid electric vehicle. The power generation system 12 includes an engine 17 , a power generator 18 and a power transmission mechanism 19 .

The engine 17 is a so-called internal combustion engine and is a power source of the power generation system 12 . That is, the generator 18 generates power using the power generated by the engine 17 . In this embodiment, the power generation system 12 uses the engine 17, which is an internal combustion engine, as a power source.

The generator 18 generates power with the power of the engine 17 . That is, the generator 18 generates power by being rotated by the driving force of the engine 17 . The generator 18 is connected to the battery 10 via the generator inverter 20, and the battery 10 is charged with electric power generated by the power generation. The generator inverter 20 converts AC power generated by the generator 18 into DC power and supplies the DC power to the battery 10 . In addition, the generator inverter 20 can convert the DC power of the battery 10 into AC power and supply it to the generator 18 , so that the generator 18 can be powered and rotated. As a result, the engine 17 is cranked when starting the engine 17 . In addition, the electric power of the battery 10 is consumed by power-running the generator 18 and idling the engine 17 as necessary.

In this embodiment, generator 18 is a three-phase alternator having U, V, and W phases. The detected value of the current flowing through the U phase of the generator 18 is the U phase current Iu. Similarly, the detected value of the current flowing through the V-phase of the generator 18 is the V-phase current Iv, and the detected value of the current flowing through the W-phase of the generator 18 is the W-phase current Iw. Below, the detected value of the current flowing through each phase of the generator 18 may be collectively referred to as three-phase current. The detected value of the d-axis current of the generator 18 is the _d -axis current Id, and the detected value of the q-axis current of the generator 18 is the _q -axis current Iq. The _d -axis current Id and the _q -axis current Iq are detected by transforming the three-phase currents. Hereinafter, the _d -axis current Id and the _q -axis current Iq of the generator 18 may be collectively referred to as _dq -axis currents Id and _Iq . In addition, the detected value of the rotation speed of the generator 18 (hereinafter simply referred to as rotation speed ω _G ) can be detected.

The power transmission mechanism 19 is a mechanism that transmits power generated by the engine 17 to the generator 18 . In the present embodiment, the power transmission mechanism 19 is a so-called damper, which not only transmits the power generated by the engine 17 but also mitigates changes in the power generated by the engine 17 and transmits the power to the generator 18 . In particular, the power transmission mechanism 19 of this embodiment is a so-called torsional damper, which directly connects the output shaft of the engine 17 and the input shaft of the generator 18, and dampens fluctuations in transmitted power by mechanical twist. That is, the power transmission mechanism 19, which is a torsional damper, responds to the power input from the engine 17 and/or the torque generated in the generator 18 for power generation (hereinafter referred to as generator torque _TG (not shown)). By twisting accordingly, fluctuations in power to be transmitted are mitigated. In the present embodiment, a direct connection means a direct mechanical connection that cannot be arbitrarily cut without using other objects (members, mechanisms, etc.).

FIG. 2 is a graph showing power transmission characteristics (torsion spring characteristics) of the power transmission mechanism 19. As shown in FIG. As shown in FIG. 2, when the power transmission mechanism 19 is twisted when transmitting power, a torque corresponding to this twist (hereinafter referred to as damper torque _Tdmp ) is generated. The damper torque T _dmp is proportional to the torsion angle θ _TW as _long as the torsion angle θ _TW is within a predetermined range. That is, if the torsion angle θ _TW is within a predetermined range, the power transmission mechanism 19 can be linearly deformed. Below, the limit torsion angle θ _TW at which a nonlinear response to the input power begins is defined as the linear limit torsion angle θ _TWlim , and the damper torque T _dmp when the torsion angle θ _TW reaches the linear limit torsion angle θ _TWlim is Let the linear limit damper torque be T _dmplim . Therefore, the "predetermined range" within which the power transmission mechanism 19 can be linearly deformed is the range of ± _θTWlim for the torsion angle _θTW and the range ± _Tdmplim for the damper _{torque Tdmp} . The linear limit torsion angle θ _TWlim and the linear limit damper torque T _dmplim are determined in advance by the material, structure, etc. of the power transmission mechanism 19 .

Also, the linear limit damper torque T _dmplim is a limit value of the damper torque T _dmp that is allowable for the power transmission mechanism 19 to function as a damper. Therefore, the linear limit damper _{torque Tdmplim} can also be called the allowable damper torque.

When the damper torque T _dmp generated by the power input to the power transmission mechanism 19 falls within the above-described predetermined range, the power transmission mechanism 19 can transmit the power while mitigating fluctuations in the power. When the damper torque _Tdmp generated by the power input to the power transmission mechanism 19 does not fall within the predetermined range, the power transmission mechanism 19 bottoms out. A bottoming out state means a state in which fluctuations in input power cannot be mitigated. When the power transmission mechanism 19 bottoms out, the input power causes the power transmission mechanism 19 and the like to deform beyond the linear limit torsion angle θ _TWlim . As a result, the power transmission mechanism 19, the engine 17, the generator 18, or their joints may be damaged. Therefore, in the present embodiment, output limitation is performed to limit the output of the engine 17, the generator 18, or both of them so that the damper torque _Tdmp falls within the predetermined range. A specific aspect of the output limitation will be described later in detail.

The electric vehicle 100 includes, in addition to the above-described power generation system 12 and the like, various controllers for controlling travel and the like and controlling the power generation system 12 (see FIG. 1). Specifically, as shown in FIG. 1, it includes a system controller 21, a drive motor controller 22, a battery controller 23, a generator controller 24, and an engine controller 25. FIG. Further, in this embodiment, the system controller 21 includes a power generation control section 26 .

The system controller 21 is a high-level control unit that controls each unit of the electric vehicle 100 using vehicle information. The vehicle information is a parameter representing the operating state of each part that constitutes the electric vehicle 100 . For example, parameters representing the driving state of the electric vehicle 100, such as the accelerator opening Apo, which is the amount of operation of the accelerator pedal by the driver, the vehicle speed V, and the gradient of the road surface on which the electric vehicle 100 is located, are vehicle information. Further, parameters representing the internal state of the electric vehicle 100, such as the SOC (State Of Charge) of the battery 10, the power that can be input and the power that can be output from the battery 10, and the power generated by the power generation system 12, are also vehicle information. For example, the rotation speed ω _G of the generator 18, the d-axis current I _d , the q-axis current I _q , and the like are vehicle information. These are examples of parameters representing the rotation state of the generator 18 . The battery voltage _Vdc is vehicle information. In addition, the actual torque of the engine 17 (hereinafter referred to as engine torque TE), the actual generator _{torque TG ,} etc., can be obtained directly using a sensor or the like, or can be obtained indirectly through calculation using vehicle information. is included in the vehicle information. The system controller 21 can acquire these various types of vehicle information as necessary using sensors (not shown), various types of controllers described above, and the like.

The system controller 21 uses one or more pieces of vehicle information to calculate a driving torque command value. The drive torque command value is a command value representing a target torque (hereinafter referred to as drive torque) that the drive motor 11 should output. Therefore, the system controller 21 operates as a drive torque command value calculation unit that calculates a drive torque command value for driving the electric vehicle 100 . The drive torque command value is input to the drive motor controller 22 . In this embodiment, the system controller 21 calculates the driving torque command value according to the accelerator opening Apo, the vehicle speed V, the SOC of the battery 10, the power that can be input, the power that can be output, the power generated by the generator 18, and the like. .

The system controller 21 uses one or more pieces of vehicle information to calculate the target power generation. The target power generation is a target value of power to be generated by the power generation system 12 to charge the battery 10 and/or supply the drive motor 11 . Therefore, the system controller 21 operates as a target generated power calculation unit that calculates a target generated power regarding power generation in the electric vehicle 100 . The calculated target power generation is input to the power generation control unit 26 .

The power generation control unit 26 controls power generation by the power generation system 12 based on the target power generation. Specifically, the power generation control unit 26 calculates a generator rotation speed command value ω _G ^* and an engine torque command value T _E1 ^* based on the target power generation, and operates the power generation system 12 based on these. The generator rotation speed command value ω _G ^* is a command value (target value) representing the rotation speed that the generator 18 should maintain in order for the power generation system 12 to generate the target generated power. The generator rotation speed command value ω _G ^* is input to the generator controller 24 . The engine torque command value T _E1 ^* is a command value (target value) representing the torque that the engine 17 should output in order for the power generation system 12 to achieve the target power generation. The engine torque command value T _E1 ^* is input to the engine controller 25 . The power generation control unit 26 also monitors the rotation speed ω _G of the generator 18 . Then, when the rotation speed ω _G exceeds a predetermined rotation speed threshold TH _rs (see FIG. 10) and the generator 18 is over-rotated, the power generation control unit 26 stops power generation by the power generation system 12 for safety. Let

In this embodiment, the power generation control unit 26 is provided in the system controller 21, but the power generation control unit 26 is provided independently of the system controller 21 like the generator controller 24 and the engine controller 25. may

The drive motor controller 22 , the battery controller 23 , the generator controller 24 , and the engine controller 25 are subordinate control units that individually control each part of the electric vehicle 100 based on commands from the system controller 21 .

The drive motor controller 22 switches the drive inverter 16 according to the state of the drive motor 11, such as the number of revolutions and voltage, based on the drive torque command value. Thereby, the drive motor controller 22 operates the drive motor 11 so as to generate the drive torque commanded by the system controller 21 .

The battery controller 23 measures the SOC based on the current or voltage that the battery 10 discharges or charges. The measured SOC is output to the system controller 21 . The battery controller 23 also calculates the possible input power and the possible output power of the battery 10 according to the temperature, internal resistance and/or SOC of the battery 10 . The calculation results of the possible input power and the possible output power are output to the system controller 21 .

Generator controller 24 controls the operation of generator 18 . More specifically, the generator controller 24 switches the generator inverter 20 according to the state of the generator 18, such as the rotation speed and voltage, based on the generator rotation speed command value ω _G ^* . As a result, the generator controller 24 operates the generator 18 at a rotation speed for achieving the target power generation. In this embodiment, the generator controller 24 includes a configuration for executing control for protecting the power generation system 12 (hereinafter referred to as protection control). The details of the configuration of the generator controller 24 will be described later.

The engine controller 25 is a power source controller that controls the operation of the engine 17 that is the power source. More specifically, the engine controller 25 adjusts the throttle, ignition timing, and/or fuel injection amount of the engine 17 based on the engine torque command value T _E1 ^* according to signals such as the rotation speed and temperature of the engine 17. adjust. As a result, the engine controller 25 causes the engine 17 to generate power for achieving the target power generation. Signals such as the rotation speed and temperature of the engine 17 are appropriately acquired by a sensor or the like (not shown). In this embodiment, the engine controller 25 includes a configuration for executing control for protecting the power generation system 12 . The details of the configuration of the engine controller 25 will be described later.

The system controller 21, drive motor controller 22, battery controller 23, generator controller 24, and engine controller 25 described above are composed of one or more computers. That is, each of these controllers may partially or wholly include, for example, a central processing unit (CPU), a random access memory (RAM), an input/output interface (I/O interface), and the like. Further, these controllers are programmed to periodically execute the various controls described above in a predetermined control cycle.

In this embodiment, the various controllers described above are described separately, but some or all of these controllers may be configured integrally. For example, the various controllers described above can be implemented in a single computer as a whole. Also, for example, one computer may implement some of the various controllers described above, such as implementing the generator controller 24 and the engine controller 25 in one computer. In other words, the division of various controllers described above is merely for convenience of explanation.

Among the various controllers described above, the generator controller 24 , the engine controller 25 , and the power generation control section 26 are controllers particularly related to control of the power generation system 12 . Therefore, the generator controller 24 , the engine controller 25 , and the power generation control section 26 constitute a power generation system control device 101 that controls the power generation system 12 .

[Configuration of generator controller]
FIG. 3 is a block diagram showing the configuration of the generator controller 24. As shown in FIG. As shown in FIG. 3, the generator controller 24 includes a generator torque command value calculation unit 31, a current command value calculation unit 32, a current control unit 33, a non-interfering control unit 34, a current converter 35, and a voltage conversion A vessel 36 is provided.

A generator torque command value calculation unit 31 calculates a generator torque command value T _G2 ^* for commanding the torque of the generator 18 according to the generator rotation speed command value ω _G ^* and the rotation speed ω _G . The generator torque command value T _G2 ^* is a final command value that commands the generator torque T _G that should be produced by the generator 18 for power generation. Therefore, when limiting the generator torque _TG to protect the power generation system 12, the generator torque command value _TG2 ^* represents the adjusted generator torque _TG . The generator torque command value T _G2 ^* is input to the current command value calculator 32 . Note that the rotation speed ω _G is detected by a rotation speed sensor 37 provided in the generator 18 .

The current command value calculator 32 calculates the _d -axis current command value Id ^* and the _q -axis current command value Iq of the generator 18 using the generator torque command value T _G2 ^* , the rotation speed ω _G , and the battery voltage _Vdc . Calculate ^* . The d-axis current command value I _d ^* is a command value for commanding the d-axis current I _d of the generator 18 in order to realize the generator torque T _G corresponding to the generator torque command value T _G2 ^* . Similarly, the q-axis current command value _Iq ^* is a command value for commanding the _q -axis current Iq of the generator 18 in order to achieve the generator torque _TG . The d-axis current command value I _d ^* and the q-axis current command value I _q ^* are input to the current controller 33 .

The current control unit 33 controls the generator 18 by so-called current control. Specifically, the current control unit 33 uses the d-axis current command value I _d ^* , the q-axis current command value I _q ^* , the d-axis current I _d , the q-axis current I _q , and the rotation speed ω _G , the d-axis voltage command value V _d ^* and the q-axis voltage command value V _q ^* of the generator 18 are calculated. The d-axis voltage command value V _d ^* is a command value for commanding the d-axis voltage V _d of the generator 18 in order to achieve the generator torque T _G . Similarly, the q-axis voltage command value V _q ^* is a command value for commanding the q-axis voltage V _q of the generator 18 in order to achieve the generator torque _TG . The d-axis voltage command value V _d ^* is input to the voltage converter 36 after the non-interfering voltage is subtracted from the d-axis voltage by the subtractor 38 . The d-axis voltage command value V _d ^* obtained by subtracting the decoupling voltage from the d-axis voltage is the final d-axis voltage command value for the generator 18 (hereinafter referred to as the d-axis final voltage command value V′ _d ^* ). be. The q-axis voltage command value V _q ^* is input to the voltage converter 36 after the decoupling voltage is subtracted from the q-axis voltage by the subtractor 39 . The q-axis voltage command value V _q ^* obtained by subtracting the decoupling voltage from the q-axis voltage is the final q-axis voltage command value for the generator 18 (hereinafter referred to as the q-axis final voltage command value V′ _q ^* ). be. Hereinafter, the d-axis final voltage command value _V'd ^* and the _q -axis final voltage command value V'q ^* may be collectively referred to as dq-axis final voltage command values _V'd ^* and _V'q ^* .

The non-interacting control unit 34 uses the _d -axis current Id and the _q -axis current Iq to calculate the non-interacting voltage control voltage. Decoupling refers to reducing voltage drop due to interference between the d-axis and the q-axis. A decoupling voltage is an adjustment value for decoupling the d-axis voltage and the q-axis voltage, and is calculated for each of the d-axis and the q-axis. These non-coupling voltages are subtracted from the d-axis voltage command value V _d ^* and the q-axis voltage command value V _q ^* in the subtraction units 38 and 39, respectively, as described above.

The current converter 35 converts the three-phase currents _Iu , Iv, _Iw into _dq -axis currents _Id , _Iq . Three-phase currents I _u , I _v , and I _w are detected by current sensor 40 provided between generator inverter 20 and generator 18 . In this embodiment, the _U -phase current Iu and the _V -phase current Iv are detected, and the current converter 35 calculates the _W -phase current Iw. The dq-axis currents I _d and I _q are input to the current command value calculation unit 32 and the non-interacting control unit 34 as described above.

The voltage converter 36 calculates voltage command values (three-phase voltage command values) _Vu ^* , _Vv *, _Vw ^* for each phase of UVW from the dq-axis final voltage command values _V'd ^* , _V'q ^{* .} do. These three-phase voltage command values V _u ^* , V _v ^* , V _w ^* are input to the generator inverter 20 . In response to these, the generator inverter 20 applies the U-phase voltage V _u , the V-phase voltage V _v , and the W-phase voltage V _w to each phase of the generator 18 . As a result, the generator 18 is driven with the generator torque T _G2 corresponding to the generator torque command value T _G2 ^* .

FIG. 4 is a block diagram showing the configuration of the generator torque command value calculator 31. As shown in FIG. As shown in FIG. 4 , the generator torque command value calculator 31 includes a rotation speed controller 41 and a protection controller 42 .

The rotation speed control unit 41 controls the actual rotation speed ω _{G of the generator 18 and the generator rotation speed command value so that the actual rotation speed ω G of} the generator 18 follows the generator rotation speed command value ω _G ^* . A generator torque command value T _G1 ^* is calculated based on ω _G ^* . The generator torque command value T _G1 ^* is a command value that commands the torque to be generated by the generator 18 in order to realize the generator rotation speed command value ω _G ^* . However, the generator torque command value T _G1 ^* calculated by the rotation speed control unit 41 is an ideal value or a provisional value calculated without considering protection of the power generation system 12 . The generator torque command value T _G1 ^* is input to the protection control section 42 . The rotation speed control unit 41 calculates a generator torque command value T _G1 ^* by, for example, PI control (Proportional-Integral control).

Note that the relationship between the generator torque command value T _G1 ^* calculated by the rotation speed control unit 41 and the above-described generator torque command value T _G2 ^* finally output by the generator torque command value calculation unit 31 In other words, the generator torque command value T _G1 ^* is the first generator torque command value. Also, the generator torque command value T _G2 ^* is the second generator torque command value. Also, since the generator torque command value T _G1 ^* is a torque command value determined by rotation speed control, it may be called a rotation speed control torque command value.

The protection control unit 42 calculates a generator torque command value T _G2 ^* based on the generator torque command value T _G1 ^* calculated by the rotation speed control unit 41 and the actual rotation speed ω _G of the generator 18. do. This generator torque command value T _G2 ^* becomes the final command value output by the generator torque command value calculation unit 31 . The generator torque command value T _G2 ^* is transmitted to the controlled object 43 . As a result, the generator 18 operates at a predetermined generator torque T _G corresponding to the generator torque command value T _G2 ^* . A controlled object 43 is a configuration from the current command value calculation unit 32 to the generator 18 (see FIG. 3).

A torque transmission characteristic 44 of the controlled object 43 as a whole is represented by a predetermined transmission characteristic Gp(s). However, this transmission characteristic Gp(s) represents an ideal transmission characteristic excluding the damper torque T _dmp input from the power transmission mechanism 19 . Therefore, the transfer characteristic Gp(s) is predetermined by specific configurations of the generator controller 24, the generator inverter 20, and the generator 18. FIG. Further, when the damper torque T _dmp is generated in the power transmission mechanism 19 , the damper torque T _dmp is added as a disturbance to the generator torque command value T _G2 ^* transmitted to the controlled object 43 . Note that "s" is the Laplacian operator.

The protection control unit 42 imposes restrictions to protect the power generation system 12 as necessary when calculating the final generator torque command value T _G2 ^* as described above. That is, the final generator torque command value T _G2 ^* can be obtained by correcting the generator torque command value T _G1 ^* when it is necessary to limit the generator torque T _G in order to protect the power generation system 12. , to calculate the final generator torque command value T _G2 ^* . On the other hand, when it is not necessary to limit the generator torque _TG in order to protect the power generation system 12, the protection control unit 42 directly converts the generator torque command value _TG1 ^* calculated by the rotation speed control unit 41 into the final Output as a generator torque command value T _G2 ^* . Thereby, the protection control unit 42 protects the power generation system 12 .

In addition, even when the protection control unit 42 does not limit the generator torque _TG to protect the power generation system 12, the protection control unit 42 protects the power generation system 12 by another method as necessary. In the protection control when the generator torque _TG is not limited, the engine torque _TE is limited. Protection control in which the engine torque _{TE is limited is called first protection control, and protection control in which the generator torque TG is} limited is called second protection control.

In this embodiment, when it is necessary to protect the power generation system 12, the first protection control is first executed to limit the engine torque _TE . After that, the second protection control is executed when it is necessary to further limit the generator torque _TG . That is, in the protection control of the power generation system 12 of this embodiment, the second protection control in which the generator torque _TG is limited is an auxiliary protection control.

[Protective control of power generation system]
The specific configurations of the protection control section 42 and the engine controller 25 will be described in detail below, particularly the portions related to the protection control.

FIG. 5 is a block diagram showing the configuration of the protection control section 42. As shown in FIG. As shown in FIG. 5 , the protection control section 42 includes a transmission mechanism torque estimation section 51 , an excessive torque detection section 52 and a generator torque limit calculation section 53 .

The transmission mechanism torque estimator 51 is a disturbance observer for the generator torque _TG , and estimates the disturbance acting on the generator torque _TG . In the power generation system 12, the torque generated in the power transmission mechanism 19 (hereinafter referred to as transmission mechanism torque) is not incorporated in advance into the transmission characteristic Gp(s). This is because the transmission mechanism torque fluctuates according to the input power and behaves differently according to the operating conditions of the power generation system 12 . Therefore, in the power generation system 12, the transmission mechanism torque acts as a disturbance on the generator torque _TG . In this embodiment, since the power transmission mechanism 19 is a damper, the damper torque _Tdmp is the transmission mechanism torque and acts as a disturbance on the generator torque _TG . Therefore, in the present embodiment, the transmission mechanism torque estimator 51 estimates the damper torque _Tdmp . Hereinafter, the estimated value of the damper torque T _dmp that acts as a disturbance will be referred to as a damper torque estimated value T _dmp ̂.

More specifically, the transmission mechanism torque estimator 51 includes a low-pass filter 54 , a calculator 55 and a subtractor 56 .

The low-pass filter 54 acquires the generator torque command value T _G2 ^* output by the generator torque limit calculation unit 53 and smoothes it. The generator torque command value T _G2 ^* processed by the low-pass filter 54 is input to the subtractor 56 . The characteristics of the low-pass filter 54 are represented by transfer characteristics H(s).

The calculation unit 55 uses the rotation speed ω _G of the generator 18 to back-calculate the amount equivalent to the torque command value. The calculation unit 55 is represented by the transfer characteristic H(s)/Gp(s) using the low-pass filter (H(s)) and the inverse characteristic of the transfer characteristic Gp(s). The amount equivalent to the torque command value output by the calculation unit 55 is input to the subtraction unit 56 .

The subtraction unit 56 calculates the deviation between the torque command value equivalent calculated from the rotation speed ω _G and the smoothed generator torque command value T _G2 ^* . This deviation represents the disturbance added in the process of transmitting the generator torque command value T _G2 ^* to the generator 18 . This disturbance is the damper torque T _dmp as described above. Therefore, the deviation output by the subtractor 56 is the estimated value of the damper torque T _dmp , that is, the estimated damper torque value T _dmp ̂. The damper torque estimated value T _dmp ^ is input to the excessive torque detection section 52 and the generator torque limit calculation section 53 . In this embodiment, the subtractor 56 calculates the damper torque estimated value T _dmp ̂ by subtracting the generator torque command value T _G2 ^* from the torque command value equivalent.

The excessive torque detection unit 52 detects the excessive damper torque T _dmp using the damper torque estimated value T _dmp ^. “Excessive” with respect to the damper torque T _dmp means that part or all of the power generation system 12 may be damaged. That is, when the engine 17 or the damper torque T _dmp exceeds the permissible value and may damage the power transmission mechanism 19, the generator 18, and/or their connection parts, etc., the damper torque T _dmp is excessive damper torque T _dmp . . For example, in this embodiment, a damper torque T _dmp having a magnitude exceeding the linear limit damper torque T _dmplim (see FIG. 2) can be an excessive damper torque T _dmp . However, even if the damper torque T _dmp temporarily or instantaneously exceeds the linear limit damper torque T _dmplim , there is little risk of damage to the power generation system 12 unless the damper torque T _dmp is extremely large. Also, since the damper torque T _dmp has an oscillatory behavior by its nature, the damper torque T _dmp may momentarily reach the linear limit damper torque T _dmplim even when the power generation system 12 operates continuously and normally. be. Therefore, the excessive torque detection unit 52 detects the excessive damper torque T _dmp by continuous or continuous evaluation based on the transition of the damper torque estimated value T _dmp ̂ without depending on the instantaneous value of the damper torque estimated value T _dmp ̂.

The excessive torque detection unit 52 holds a predetermined damper torque value (hereinafter referred to as damper torque threshold TH _dmp ) for detecting generation of excessive damper torque T _dmp based on the damper torque estimated value T _dmp ^. Then, when it can be evaluated that the estimated damper torque value T _dmp ^ continuously exceeds the damper torque threshold TH _dmp , or when it is predicted that the estimated damper torque value T _dmp ^ continuously exceeds the damper torque threshold TH _dmp , The excessive torque detector 52 detects excessive damper torque _Tdmp . In the present embodiment, the excessive torque detector 52 detects the excessive damper torque T _dmp when the damper torque estimated value T _dmp ^ continuously becomes equal to or greater than the damper torque threshold TH _dmp . A method of evaluating the damper torque estimated value T _dmp ^ for detecting excessive damper torque T _dmp will be described later in detail. The excessive torque detection unit 52 outputs an excessive torque detection flag _FET to the host controller or the like. Protection control of the power generation system 12 is executed according to the excessive torque detection flag _FET . The excessive torque detection flag FET indicates that excessive damper torque T _dmp has been detected or that excessive _{damper torque T dmp has} not been detected.

In this embodiment, the excessive torque detection flag _FET is input to the engine controller 25 as well as to the system controller 21 (power generation control section 26) which is a higher-level controller. The excessive torque detection flag FET is, for example, a flag that is "0" when excessive damper torque _Tdmp is not detected and "1" when excessive damper _{torque Tdmp} is detected.

The above-described excessive torque detection performed by the excessive torque detection section 52 is substantially synonymous with detection of the continuous bottoming out state of the power transmission mechanism 19 .

Also, the damper torque threshold TH _dmp is predetermined by adaptation based on experiments, simulations, or the like. Typically, the damper torque threshold TH _dmp is the linear limit damper torque T _dmplim . The damper torque threshold TH _dmp in this embodiment is equal to the linear limit damper torque T _dmplim . However, the power transmission mechanism 19 has manufacturing variations, that is, manufacturing errors or individual differences. Therefore, the linear limit damper _{torque Tdmplim} also varies according to manufacturing variations. Therefore, when the manufacturing variation of the linear limit damper torque T _dmplim is ±T _MV , the damper torque threshold TH _dmp of the present embodiment is set to the lower limit (T _dmplim −T _MV ) considering this variation. Thus, in the protection control of the present embodiment, the power generation system 12 is protected regardless of individual differences in the power transmission mechanism 19 and the linear limit damper _{torque Tdmplim} .

The generator torque limit calculation unit 53 acquires the generator torque command value T _G1 ^* from the rotation speed control unit 41, and executes a generator torque limit calculation to limit this as necessary. The generator torque limit calculation is a calculation for limiting by correcting the generator torque command value T _G1 ^* so that the damper torque T _dmp does not become an excessive damper torque T _dmp continuously within a range (hereinafter referred to as normal range). is. The generator torque command value T _G1 ^* corrected by the generator torque limit calculation is output as the final generator torque command value T _G2 ^* . Then, when the generator 18 is driven according to the corrected final generator torque command value T _G2 ^* , the generator torque T _G is restricted accordingly, and as a result, the damper torque T _dmp falls within the normal range. . That is, the first protection control that limits the generator torque T _G protects the power generation system 12 from damage due to excessive damper torque T _dmp .

In the present embodiment, the generator torque limit calculation is a calculation for auxiliary second protection control. Therefore, the generator torque limit calculation unit 53 needs to further limit the generator torque _TG after the excessive _damper torque T _dmp is detected and the first protection control for limiting the engine torque TE is executed. At some point, the generator torque limit calculation is executed.

Note that the generator torque limit calculation unit 53 determines whether or not the generator torque _TG needs to be further limited in addition to the first protection control based on the elapsed time after the start of execution of the first protection control. . That is, the generator torque limit calculation unit 53 executes the generator torque limit calculation when an excessive damper torque _Tdmp is still detected even after a certain period of time has elapsed since the start of execution of the first protection control. . The "certain period of time", which is the threshold for comparison with the elapsed time after the start of the execution of the first protection control, is based on experiments, simulations, etc., considering the time that the power generation system 12 can withstand the excessive damper torque T _dmp . Predetermined by adaptation. Hereinafter, the "fixed time" to be compared with the elapsed time after the start of execution of the first protection control is referred to as the elapsed time threshold τ (see FIG. 10).

On the other hand, when the excessive damper torque T _dmp is not detected, or when the damper torque T _dmp is within the normal range due to the first protection control, the generator torque limit calculation unit 53 outputs the torque related to the second protection control to the power generation. Do not perform limit operations. That is, in these cases, the generator torque limit calculation unit 53 does not impose any limitation on the generator torque command value T _G1 ^* acquired from the rotation speed control unit 41, and the final generator torque command value is obtained as it is. Output as the value T _G2 ^* .

Also, the normal range is a range of damper torque T _dmp that is permissible from the viewpoint of protecting the power generation system 12 from damage due to continuation of excessive damper torque T _dmp , and is predetermined by adaptation based on experiments, simulations, or the like. For example, as a result, when the actual generator torque T _G falls within a range of ±several percent (eg ±5%) of the generator torque command value T _G1 ^* calculated by the rotation speed control unit 41, the damper torque T _dmp falls within the normal range.

Therefore, in the generator torque limit calculation of the present embodiment, the generator torque within the normal range determined by the actual generator torque T _G and the generator torque command value T _G1 ^* (hereinafter referred to as normal generator torque T _G1 ) and the difference ΔT _G (not shown) is calculated. Based on this difference ΔT _G , the limit value of the generator torque command value T _G1 ^* is determined. Hereinafter, the limit value for the generator torque command value T _G1 ^* will be referred to as the generator torque limit value _LG .

The generator torque limit value _LG is determined by calculation so as to vary according to the difference ΔT _G. However, the generator torque limit value _LG can be a predetermined constant value. In this embodiment, the generator torque limit value _{LG is a fixed negative value, and is added to the generator torque command value TG1* when the difference ΔT G is} ^equal _to or greater than a predetermined threshold value.

FIG. 6 is a block diagram showing the configuration of the engine controller 25. As shown in FIG. As shown in FIG. 6, an engine torque limit calculator 61 is provided. The engine torque limit calculation unit 61 acquires the engine torque command value T _E1 ^* from the power generation control unit 26, and executes engine torque limit calculation to limit this as necessary. The engine torque limit calculation is a calculation for limiting by correcting the engine torque command value T _E1 ^* so that the damper torque T _dmp is continuously within the normal range. The engine torque command value T _E1 ^* corrected by the engine torque limit calculation is the final torque command value for the engine 17 (hereinafter referred to as engine torque command value T _E2 ^* ). Therefore, the engine controller 25 drives the engine 17 so as to generate the engine torque T _E corresponding to this final engine torque command value T _E2 ^* .

In this embodiment, the engine torque control calculation is a calculation for first protection control that is preferentially executed to protect the power generation system 12 . Therefore, the engine torque limit calculation unit 61 executes engine torque control calculation when an excessive damper torque _Tdmp is detected. On the other hand, when the excessive damper torque _Tdmp is not detected, the engine torque limit calculation unit 61 does not execute the engine torque control calculation related to the first protection control. That is, in this case, the engine torque limit calculation unit 61 uses the engine torque command value T _E1 ^* calculated by the power generation control unit 26 as it is as the final engine torque command value T _E2 ^* to drive the engine 17. . In this way, when the engine 17 is driven according to the corrected final engine torque command value T _E2 ^* , the engine torque T _E is limited accordingly, and as a result, the damper torque T _dmp falls within the normal range. That is, the second protection control that limits the engine torque T _E protects the power generation system 12 from damage due to the excessive damper torque T _dmp .

The normal range of the damper torque _Tdmp in the engine torque limit calculation is the same as the normal range of the damper torque _Tdmp in the generator torque limit calculation. Then, for example, when the actual engine torque T _E falls within a range of ±several percent (eg, ±5%) of the engine torque command value T _E1 ^* calculated by the power generation control unit 26, as a result, the damper torque T _dmp falls within the normal range.

Therefore, in the engine torque limit calculation of the present embodiment, the difference between the actual engine torque T _E and the engine torque within the normal range determined by the engine torque command value T _E1 ^* (hereinafter referred to as normal engine torque T _E1 ) ΔT _E (not shown) is calculated. Based on this difference ΔT _E , the limit value of the engine torque command value T _E1 ^* is determined. Hereinafter, the limit value for this engine torque command value T _E1 ^* will be referred to as an engine torque limit value _LE .

The engine torque limit value _LE is determined by calculation so as to vary according to the difference ΔT _E. However, the engine torque limit value _LE can be a predetermined constant value. In this embodiment, the engine torque limit value _{LE is a fixed negative value, and is added to the engine torque command value TE1* when the difference ΔT E is} ^equal _to or greater than a predetermined threshold value.

The operation of the protection control of the power generation system 12 in the electric vehicle 100 configured as described above will be described below.

FIG. 7 is a flow chart showing the action of the power generation system control method. As shown in FIG. 7 , in the power generation system control device 101, in step S101, the transmission mechanism torque estimating unit 51 outputs the vehicle information representing the rotation speed ω G of the generator 18 and the rotation speed ω _G of the generator calculated by the rotation speed control unit 41. Acquire the torque command value T _G1 ^* . Next, in step S102, the transmission mechanism torque estimating unit 51 uses the obtained rotational speed ω _G and generator torque command value T _G1 ^* to calculate the damper torque estimated value T _dmp ̂, which is the estimated value of the transmission mechanism torque. do.

Thereafter, in step S103, the excessive torque detection unit 52 uses the damper torque estimated value T _dmp ̂ to perform excessive torque detection for detecting excessive damper torque T _dmp . As a result of this excessive torque detection, when generation of excessive damper torque _Tdmp is detected, torque limit calculation is executed in step S104. In the present embodiment, the first protection control that limits the engine torque _TE is preferentially executed, so in step S104, the engine torque limit calculation section 61 executes the engine torque limit calculation. As a result, in step S105, the engine 17 is driven while the output is limited so that the engine torque _TE is reduced. As a result, the torque that the engine 17 inputs to the power transmission mechanism 19 is reduced, so that the damper torque T _dmp is reduced to fall within the normal range, and the power generation system 12 is protected from damage due to excessive damper torque T _dmp .

In step S104, when the first protection control for limiting the engine torque TE is executed and a certain period of time has passed, the second protection control for _{limiting the generator torque TG is} executed. That is, in a state where the first protection control has already been executed, the generator torque limit calculation unit 53 additionally executes the generator torque limit calculation in step S104. As a result, in subsequent step S105, the output of the engine 17 is restricted and the output of the generator 18 is restricted. As a result, in a situation where an excessive damper torque T _dmp is still detected after a certain period of time has passed while the first protection control is being executed, the damper torque T _dmp is reduced by limiting the output of the generator 18. further adjusted to fall within the normal range. Therefore, the power generation system 12 is reliably protected from damage due to excessive damper torque _Tdmp .

FIG. 8 is a flowchart showing a specific evaluation method of the damper torque estimated value T _dmp ^ in excessive torque detection. This damper torque estimated value T _dmp ̂ evaluation method is for preventing hunting in which execution and stop of protection control are frequently repeated. Specifically, the damper torque T _dmp and the damper torque estimated value T _dmp ̂ behave oscillatingly due to the nature of the power transmission mechanism 19 . Therefore, when excessive torque is detected based on the instantaneous value of the estimated damper torque value T _dmp ̂, the estimated damper torque value T _dmp ̂ repeatedly crosses over the damper torque threshold TH _dmp , and the execution and stop of the protection control of the power generation system 12 are frequently repeated. A state (so-called hunting) may occur. Therefore, in the excessive torque detection of the present embodiment, this is taken into consideration, and the damper torque estimated value T _dmp ̂ is evaluated by the maximum value within a certain period of time as follows.

As shown in FIG. 8, in excessive torque detection, initial values of various parameters are set in step S201. The parameters for which the initial values are set here are the count number Nc, the instantaneous maximum value, and the constant time maximum value.

The count number Nc is a parameter that stores the number of times the instantaneous maximum value exceeds the damper torque threshold TH _dmp . The initial value of the count number Nc is "0". The excessive torque detection unit 52 counts the number of times the instantaneous maximum value exceeds the damper torque threshold TH _dmp based on the transition of the damper torque estimated value T _dmp ̂, and appropriately updates the count number Nc.

The instantaneous maximum value is a parameter that stores the instantaneous maximum value of the damper torque estimated value T _dmp ^ in a very short period of time. That is, the instantaneous maximum value represents the maximum value of the damper torque estimated value T _dmp ^ in the short term, including fine vibrational fluctuations. Also, there are two types of instantaneous maximum values, the current value and the previous value. Hereinafter, the present value of the instantaneous maximum value is referred to as "M1", and the previous value of the instantaneous maximum value is referred to as "M1p". The initial values of the current maximum value and the previous value of the instantaneous maximum value are both "0". The excessive torque detection unit 52 appropriately updates or maintains the current and previous values of the instantaneous maximum value based on the transition of the damper torque estimated value T _dmp ̂.

The constant time maximum value is a parameter that stores the maximum value of the damper torque estimated value T _dmp ^ in a constant time. Therefore, the constant-time maximum value represents an estimated value of the maximum value (local maximum value) of the damper torque T _dmp over a long period of time without being affected by fine vibrational fluctuations. Further, there are two types of maximum values for a certain period of time: the current value and the previous value. Hereinafter, the current value of the maximum value for the fixed time period is referred to as "M2", and the previous value of the maximum value for the fixed time period M2 is referred to as "M2p". The initial values of the current maximum value and the previous value of the fixed time maximum value are both "0". The “fixed time” referred to here is the time until the count number Nc reaches a predetermined number of times (hereinafter referred to as count threshold TH _cnt ) when the damper torque estimated value T _dmp ^ oscillates near the damper torque threshold TH _dmp . It's time. Therefore, this "fixed time" is predetermined by adaptation based on experiments, simulations, or the like. Also, the “certain period of time” has at least a length sufficient to acquire data for one cycle of the torsional vibration frequency of the power transmission mechanism 19 . Also, the count threshold TH _cnt is predetermined by adaptation. The excessive torque detection unit 52 appropriately updates or maintains the current value and the previous value of the maximum value for a certain period of time based on the transition of the damper torque estimated value T _dmp ̂.

In step S202, the excessive torque detection unit 52 compares the count number Nc with the count threshold TH _cnt . That is, in step S202, it is determined whether or not the damper torque estimated value T _dmp ^ continuously exceeds the damper torque threshold TH _dmp by comparing the count number Nc with the count threshold TH _cnt . Then, when the count number Nc is smaller than the count threshold TH _cnt and it cannot be said that the damper torque estimated value T _dmp ^ continuously exceeds the damper torque threshold TH _dmp , step S203 is executed.

In step S203, the absolute value (|T _dmp ^|) of the damper torque estimated value T _dmp ^ is compared with the previous value M1p of the instantaneous maximum value. Then, when the absolute value of the estimated damper torque value T _dmp ^ exceeds the previous value M1p of the instantaneous maximum value, the absolute value of the estimated damper torque value T _dmp ^ is stored as the current value M1 of the instantaneous maximum value in step S204. On the other hand, when the absolute value of the damper torque estimated value T _dmp ^ is equal to or less than the previous value M1p of the instantaneous maximum value, the previous value M1p of the instantaneous maximum value is input as the current value M1 of the instantaneous maximum value in step S205. Its value is preserved. Thereby, the instantaneous maximum value is updated or maintained according to the transition of the damper torque estimated value T _dmp ^.

Further, in step S206, the previous value M2p of the maximum value for a certain period of time is stored in the current value M2 of the maximum value for a certain period of time, and the value of the maximum value for a certain period of time is maintained. Step S206 is executed when, as determined in step S202, it cannot be said that the damper torque estimated value T _dmp ^ has continuously exceeded the damper torque threshold TH _dmp . Therefore, in step S206, the maximum value is maintained for a certain period of time as described above.

Thereafter, in step S207, the excessive damper torque T _dmp is detected using the current value M2 which is the maximum value for a certain period of time and is maintained. Excessive damper torque T _dmp is detected by comparing current value M2, which is the maximum value for a certain period of time, and damper torque threshold TH _dmp . Specifically, an excessive damper torque T _dmp is detected when the current value M2, which is the maximum value for a certain period of time, is greater than the damper torque threshold TH _dmp .

When the excessive damper torque T _dmp detection process is completed, in step S208, the current value M1 of the momentary maximum value is stored as the previous value M1p. Similarly, the current value M2, which is the maximum value for a certain period of time, is also stored as the previous value M2p.

On the other hand, when it is determined in step S202 that the count number Nc is equal to or greater than the count threshold TH _cnt , step S209 is executed. In step S209, the previous value M1p of the instantaneous maximum value is stored in the current value M2 of the maximum value for a certain period of time. That is, when the count number Nc becomes equal to or greater than the count threshold TH _cnt and the damper torque estimated value T _dmp ^ continuously becomes equal to or greater than the damper torque threshold TH _dmp , the maximum value for a certain period of time is updated using the instantaneous maximum value. .

Next, in step S210, the count number Nc is reset to "0". Further, in step S211, the absolute value of the damper torque estimated value T _dmp ^ is stored as the current value M1 of the instantaneous maximum value. As a result, the current value M1 of the instantaneous maximum value is updated.

After that, in step S207, an excessive damper torque T _dmp ̂ is detected using the updated current value M2 of the maximum value for a certain period of time. Further, in step S208, the current value M1 of the instantaneous maximum value and the current value M2 of the constant time maximum value are stored as the previous values.

As described above, the excessive torque detection unit 52 uses the constant time maximum value of the estimated damper torque value T _dmp ̂ instead of the instantaneous maximum value of the estimated damper torque value T _dmp ̂ to detect the excessive damper torque T _dmp . This prevents hunting in protection control.

_FIG . 9 is a timing chart showing the action of the first protection control by limiting the engine torque TE. FIG. 9A shows changes in the excessive torque detection flag _FET . _FIG . 9B shows changes in the torque limit values _LG and LE. FIG. 9(C) shows changes in the engine torque T _E and the engine torque command value T _E2 ^* . FIG. 9D shows changes in the estimated damper torque value T _dmp ^ and the maximum value for a certain period of time (current value M2). FIG. 9(E) shows changes in the generator torque command value T _G2 ^* . FIG. 9(F) shows changes in the rotational speed _ωG . The horizontal axis in each of these charts is time.

As shown in FIG. 9C, time t1 is the start time of power generation by the power generation system 12 . When the engine torque command value T _E2 ^* is generated at time t1, the engine torque T _E increases accordingly. As a result, as shown in FIG. 9( _D ), the damper torque estimated value T _dmp ^ increases as the engine torque TE increases. After that, when the power transmission mechanism 19 approaches the bottoming out state, the damper torque estimated value T _dmp ^ begins to fluctuate, and the maximum value (current value M2) for a certain period of time exceeds the damper torque threshold TH _dmp at time t2. As a result, as shown in FIG. 9A, at time t2, an excessive damper torque _Tdmp is detected and the excessive torque detection flag _FET becomes "1".

When the excessive damper torque _Tdmp is detected at time t2 in this way, the first protection control is started to limit the engine torque _TE . Therefore, as shown in _FIG . 9B, the engine torque limit value LE in the first protection control is generated from time t2. As a result, as shown in FIG. 9C, from time t3, the engine torque command value T _E2 ^* becomes a value limited by correction using the engine torque limit value L _E . Then, the engine torque T _E is reduced following the change in the engine torque command value T _E2 ^* .

Then, as shown in FIGS. 9(E) and 9(F), the generator torque command value T _G2 ^* and the rotation speed ω _G gradually converge while fluctuating. Then, as shown in FIG. 9(D), the damper torque estimated value T _dmp ̂ also gradually converges following these. As a result, at time t4, the damper torque estimated value T _dmp ̂ generally falls below the damper torque threshold TH _dmp , and the power transmission mechanism 19 exits the bottoming out state.

As described above, even when the power transmission mechanism 19 temporarily bottoms out, the power transmission mechanism 19 quickly escapes from the bottoming out state by the first protection control that limits the engine torque _TE . Therefore, according to the control of the power generation system 12 of this embodiment, the power generation system 12 is protected from damage due to excessive damper torque T _dmp .

FIG. 10 is a timing chart showing the action of the second protection control for limiting the generator torque _TG . FIG. 10A shows changes in the excessive torque detection flag _FET . _FIG . 10B shows changes in the torque limit values _LG and LE. FIG. 10(C) shows changes in the engine torque T _E and the engine torque command value T _E2 ^* . FIG. 10D shows changes in the estimated damper torque value T _dmp ^ and the maximum value for a certain period of time (current value M2). FIG. 10(E) shows changes in the generator torque command value T _G2 ^* . FIG. 10(F) shows changes in the rotational speed _ωG . The horizontal axis in each of these charts is time.

As shown in FIG. 10C, time t5 is the start time of power generation by the power generation system 12 . When the engine torque command value T _E2 ^* is generated at time t5, the engine torque T _E increases accordingly. As a result, as shown in FIG. 10( _D ), the damper torque estimated value T _dmp ^ increases as the engine torque TE increases. After that, when the power transmission mechanism 19 approaches the bottoming-out state, the maximum value (current value M2) for a certain period of time exceeds the damper torque threshold TH _dmp at time t6. Further, as shown in FIG. 10A, at time t6, an excessive damper torque _Tdmp is detected and the excessive torque detection flag _FET becomes "1". As a result, the first protection control is executed to limit the engine torque TE, and the engine torque limit value _LE is generated as shown in _FIG . 10(B). Accordingly, the engine torque command value T _E2 ^* is reduced. That is, the behavior of the power generation system 12 up to this point is the same as in the case of FIG.

On the other hand, as shown in FIG. 10( _C ), in this example, due to insufficient engine torque limit value LE or other unforeseen circumstances, even if the first protection control is executed, engine torque _TE is not sufficiently reduced. In this case, as shown in FIG. 10(D), the damper torque estimated value T _dmp ̂ does not converge, and vibratory fluctuation due to the bottoming state continues. Therefore, when a certain period of time (elapsed time threshold value τ) elapses from time t6 when the first protection control is started, the second protection control is additionally started at time t7. As a result, as shown in FIG. 10( _B ), a generator torque limit value LG is generated to limit the generator torque _TG . As a result, as shown in FIG. 10(E), the oscillatory fluctuation of the generator torque command value T _G2 ^* _subsides , and as shown in FIG. Below TH _dmp . As a result, the power transmission mechanism 19 exits from the bottomed state.

However, as shown in FIG. 10(E), the rotational speed ω _G of the generator 18 tends to increase as a whole, although the oscillating fluctuations tend to converge. Then, at time t8, the rotation speed threshold TH _rs is exceeded, and the generator 18 reaches over rotation. Therefore, the power generation system 12 is stopped at time t8.

As described above, in the present embodiment, when the power transmission mechanism 19 reaches the bottoming state and the power transmission mechanism 19 is not cleared from the bottoming state even after the first protection control is executed, the generator torque _TG is The bottomed state of the power transmission mechanism 19 is eliminated by the restricted second protection control. As a result, although the generator 18 over-rotates and power generation by the power generation system 12 is stopped, the power generation system 12 is reliably protected from damage due to the excessive damper torque T _dmp .

As described above, in the control of the power generation system 12 of the present embodiment, the damper torque T _dmp , which is difficult to measure with a sensor or the like, is estimated by calculation, and the estimated value (damper torque estimated value T _dmp ^) is used to calculate the first protection control, or first protection control and second protection control. This protects the power generation system 12 from damage due to excessive damper torque T _dmp .

Note that the example shown in FIG. 10 is substantially the same as the case where the first protection control is not performed. Therefore, in the above-described first embodiment, the second protection control is supplementarily executed as insurance when the excessive damper torque T _dmp is not eliminated by the first protection control, but the second protection control is executed independently. may be In this case also, the power generation system 12 can be protected from damage due to excessive damper torque T _dmp in the manner shown in FIG. 10 in the first embodiment. Moreover, in the first embodiment, both the first protection control and the second protection control are performed, but the first protection control may be performed alone. This is as shown in the example of FIG. Furthermore, contrary to the above-described embodiment, after the second protection control is preferentially performed, the first protection control may be performed secondarily when necessary.

However, when the damper torque T _dmp is kept within the normal range by the first protection control, the rotational speed ω _G of the generator 18 is also stabilized, so it is easy to continue power generation thereafter. On the other hand, when the damper torque T _dmp is kept within the normal range by the second protection control, the rotation speed ω _G of the generator 18 increases, leading to excessive rotation, and the power generation system 12 may be stopped. Therefore, when both the first protection control and the second protection control can be performed, it is preferable to perform at least the first protection control. Then, as in the first embodiment, after executing the first protection control, it is particularly preferable to additionally execute the second protection control when necessary.

Also, the output of the engine 17 and the generator 18 is determined by their torque and rotation speed. Therefore, in the first embodiment, the engine torque _TE is limited as the output limitation of the engine 17 in the first protection control. Further, in the second protection control, the generator torque _TG is limited as the output limitation of the generator 18 . However, this manner of limiting torque is an example of output limitation. Therefore, in the first protection control and/or the second protection control, the number of revolutions or the like may be limited instead of the torque. That is, in the first protection control, the power generation system 12 can be protected from damage due to the excessive damper torque _Tdmp also by limiting the output of the engine 17 by the rotation speed. Similarly, in the second protection control, the power generation system 12 can also be protected from excessive damper torque T _dmp by limiting the output of the generator 18 by the rotation speed.

In addition, in the above-described first embodiment, when both the first protection control for limiting the engine torque TE and the second protection control for _{limiting the generator torque TG are} executed, the generator 18 is overloaded. reaching rotation. However, when both the first protection control and the second protection control are executed, over-rotation of the generator 18 can be prevented, and power generation by the power generation system 12 can be continued. The cause of the overspeed of the generator 18 is that the generator torque _TG is equal to or less than the engine torque _TE , and the engine torque _TE is not suppressed. Therefore, when executing these protection controls at the same time, by limiting the output of the engine 17 and/or the generator 18 so that the engine torque _{TE is less than the generator torque TG ,} the overspeed of the generator 18 is prevented. That is, even when the output of the engine 17 and the generator 18 is restricted by protection control, the engine torque _TE is controlled within a torque range that allows the rotation speed of the generator 18 to be controlled. can be continued. The adjustment of the engine torque TE during the first protection control and the generator torque _TG during the second protection control is performed by _adjusting the engine torque limit value _LE and/or the generator torque limit value _LG , for example. be able to.

[Second embodiment]
In the first embodiment, the damper torque estimated value T _dmp ^ is used as it is in the first protection control and the second protection control, but the damper torque estimated value T _dmp ^ is converted to other parameters and used. may For example, the damper torque estimated value T _dmp ^ is converted to a torsion angle estimated value (hereinafter referred to as a torsion angle estimated value θ _TW ^), and this torsion angle estimated value θ _TW ^ is used instead of the damper torque estimated value T _dmp ^. First protection control and second protection control may be performed.

FIG. 11 is a block diagram showing the configuration of the protection control section 42 according to the second embodiment. As shown in FIG. 11, when the damper torque estimated value T _dmp ̂ is converted into the torsion angle estimated value θ _TW ̂ and used, the protection control unit 42 is provided with a torque-torsion angle conversion unit 201 . Also, the excessive torque detection section 52 in the first embodiment is replaced with an excessive torsion angle detection section 202 .

A torque-torsion angle conversion unit 201 follows the known power transmission characteristics of the power transmission mechanism 19 (see FIG. 2) to calculate a corresponding torsion angle estimate θ _TW ̂ from the damper torque estimate T _dmp ̂. . Also, the excessive torsion angle detection unit 202 detects an excessive damper torque T _dmp or an excessive torsion angle θ _TW using the torsion angle estimated value θ _TW ^ instead of the damper torque estimated value T _dmp ^. The specific calculation manner thereof conforms to the calculation manner of the excessive torque detection section 52 of the first embodiment.

Then, as described above, when the torque-torsion angle conversion unit 201 and the excessive torsion angle detection unit 202 are provided, the generator torque limit calculation unit 53 and the engine torque limit calculation unit 61 are equivalent to the damper torque estimated value T in the first embodiment. Calculations similar to those performed using _dmp ^ are performed using the torsion angle estimate θ _TW ^. As a result, even when the torsion angle estimated value θ _TW ^ is used, the power generation system 12 is protected from damage due to excessive damper torque T _dmp as in the first embodiment.

[Third Embodiment]
In the first and second embodiments, the first protection control and the second protection control are executed when an excessive damper torque T _dmp ^ is detected, and the first protection control and/or the second protection control When the damper torque T _dmp ^ falls within the normal range, the first protection control and the second protection control are finished. However, considering the past record of excessive damper torque T _dmp ̂ once occurring, even if damper torque T _dmp ̂ falls within the normal range by the first protection control and/or the second protection control, excessive damper torque T _dmp In some cases, the situation where ^ is likely to occur continues. In this case, an excessive damper torque T _dmp ̂ is generated immediately after the first protection control and/or the second protection control is finished, and the first protection control and/or the second protection control are repeated again. That is, hunting may occur in the first protection control or the second protection control.

Therefore, when an excessive damper torque T _dmp is detected, it is preferable to continue executing the first protection control and/or the second protection control for a certain period of time even after the damper torque T _dmp falls within the normal range. For example, when an excessive torque detection flag _FET indicating that an excessive damper torque _Tdmp has been detected is input, the power generation control unit 26 controls the generator controller 24 and the engine controller 25 through the first protection control and the second protection control, respectively. Gives an instruction to continue execution of protection control for a certain period of time. This prevents hunting of the first protection control and the second protection control.

The certain period during which the first protection control and the second protection control should be continued to prevent hunting is, for example, one trip period of electric vehicle 100 . The trip period is a period from when electric vehicle 100 starts to when it stops or stops next time. Then, for example, when the ignition switches from off to on, the power generation control unit 26 can cancel the instruction to continue the first protection control and the second protection control. In this way, even if the first protection control or the second protection control is once executed, hunting of these protection controls does not occur, and power generation by the power generation system 12 can be stably continued.

Note that the protection continuation control that continues the protection control as described above is mainly performed by other controllers such as the system controller 21, the power generation control unit 26, the generator controller 24, or the engine controller 25 instead of the power generation control unit 26. It may be performed as

As described above, the power generation system control method according to the above-described embodiments and the like includes the engine 17 as a power source that generates power, the generator 18 that generates power using the power, and the power transmission that transmits the power to the power generator 18. A power generation system control method for controlling a power generation system 12 having a mechanism 19 . In this power generation system control method, a generator torque command value T _G2 ^* that commands the torque (generator torque T _G ) to be generated by the generator 18, a rotation speed ω _G that indicates the rotation state of the generator 18, , a transmission mechanism torque estimated value (damper torque estimated value T _dmp ^), which is an estimated value of the torque (damper torque T _dmp ) generated in the power transmission mechanism 19, is calculated. Then, based on the damper torque estimated value T _dmp ^ that is the transmission mechanism torque estimated value, the output that limits the output of the engine 17 and the generator 18 that are the power sources, or the output of both the engine 17 and the generator 18 that are the power sources As a limitation, the first protection control and/or the second protection control are executed.

Thus, in the power generation system control method according to the above-described embodiments and the like, the control protects the power generation system 12 from damage due to excessive torque of the transmission mechanism. No configuration required. That is, according to the power generation system control method according to the above-described embodiments and the like, the power generation system 12 is protected from damage due to excessive output of the engine 17 or the like, which is the power source, without requiring a configuration that enlarges the power generation system 12. be.

In addition, in the power generation system control method according to the above-described embodiments and the like, the output of at least the engine 17, which is the power source, is restricted based on the damper torque estimated value T _dmp ̂, which is the transmission mechanism torque estimated value. If the power generation system 12 is protected by restricting the output of the engine 17, which is the power source, there is an advantage that power generation can be easily continued thereafter.

The power generation system control method according to the above-described embodiments and the like includes a mode of executing output limitation for at least the generator 18 based on the damper torque estimated value T _dmp ̂, which is the transmission mechanism torque estimated value. If the generator 18 is limited, damage to the power generation system 12 can be prevented at least, even if the power generation system 12 may stop due to over-rotation of the generator 18 . That is, it is possible to prevent a fatal error from occurring in the power generation system 12 .

In the power generation system control method according to the above-described embodiments and the like, the damper torque estimated value T _dmp ^ which is the transmission mechanism torque estimated value is the torque of the generator 18 determined by the generator torque command value T _G2 ^* and the actual torque of the generator 18. It is calculated by the deviation between the torque (torque command value equivalent) determined by the rotation speed. According to this method, the transmission mechanism torque (damper torque T _dmp ), which is difficult to measure with a sensor or the like, can be accurately obtained by calculation. As a result, the first protection control and/or the second protection control, which are the protection controls for the power generation system 12, are properly executed.

In the power generation system control method according to the above-described embodiments and the like, the output limitation of the power source and the like is executed when the damper torque estimated value T _dmp ̂, which is the transmission mechanism torque estimated value, becomes equal to or greater than the predetermined damper torque threshold TH _dmp . According to this method, the bottoming state of the power transmission mechanism 19 can be easily and accurately grasped or predicted. As a result, the first protection control and/or the second protection control, which are the protection controls for the power generation system 12, are properly executed.

In the power generation system control method according to the above-described embodiments and the like, the determination of whether or not the damper torque estimated value T _dmp ̂, which is the transmission mechanism torque estimated value, has reached or exceeded the damper torque threshold value TH _dmp is performed within a predetermined time (fixed time). This is done by comparing the maximum value of the transmission mechanism torque estimate (maximum value for a certain period of time) with the damper torque threshold TH _dmp . When the instantaneous value of the damper torque estimated value T _dmp ^ is used, there are cases where the protection control of the power generation system 12 hunts due to its vibrational fluctuations. Control is executed precisely.

In the power generation system control method according to the above embodiment and the like, the damper torque threshold TH _dmp is set to the linear limit damper torque T _dmplim (allowable damper torque), which is the limit value of the transmission mechanism torque at which the power transmission mechanism 19 can be linearly deformed. A damper torque T _dmp that is greater than or equal to the linear limit damper torque T _dmplim can become an excessive damper torque T _dmp that damages the power generation system 12 . Therefore, by using the linear limit damper _{torque Tdmplim} as a threshold value, it is possible to accurately determine the excessive damper torque _Tdmp . As a result, the protection control of the power generation system 12 is properly executed.

In particular, in the power generation system control method according to the above-described embodiments and the like, when the limit value (linear limit damper torque T _dmplim ) varies due to manufacturing errors in the power transmission mechanism 19, the damper torque threshold TH _dmp is set within the range of variation due to manufacturing errors (±T _MV ) is set to the lower limit (T _dmplim −T _MV ). According to this, even if there is a manufacturing error in the power transmission mechanism 19, the excessive damper torque _Tdmp is detected without being overlooked. Therefore, the protection control of the power generation system 12 is performed more reliably so that the damper torque T _dmp does not continuously exceed the damper torque threshold TH _dmp .

In the power generation system control method according to the above-described embodiments and the like, when the output of both the engine 17 and the generator 18, which are power sources, is limited by the output limitation, the engine torque _TE , which is the torque of the engine 17, which is the power source, is , to be smaller than the generator torque _TG , which is the torque of the generator 18, the output is limited. According to this method, the rotation speed of the generator 18 is suppressed within a controllable range. As a result, power generation by the power generation system 12 can be continued while protecting the power generation system 12 and preventing the generator 18 from over-rotating.

In the power generation system control method according to the above-described embodiments and the like, when the output of both the engine 17 and the generator 18, which are the power sources, is limited by the output limitation, the output of the engine 17, which is the power source, is limited (first protection control). ) is performed, the output limitation (second protection control) for the generator 18 is performed secondarily. According to this method, the protection control of the power generation system 12 is executed in two stages. Therefore, even when the damper torque T _dmp does not converge to the normal range due to the first protection control due to unforeseen circumstances, the second protection control can converge the damper torque _Tdmp to the normal range. Therefore, according to this method, the power generation system 12 is protected more reliably.

In the power generation system control method according to the above embodiments and the like, the power transmission mechanism 19 is, for example, a damper that moderates changes in power (engine torque T _E ) and transmits the power to the power generator 18 . That is, the engine 17 and the generator 18 are directly connected by the power transmission mechanism 19 which is a damper. For this reason, the power generation system 12 can be particularly easily formed in a small size, and can be protected from damage due to excessive damper torque T _dmp .

In the power generation system control method according to the above-described embodiments and the like, the power transmission mechanism 19 is a torsion damper that mitigates fluctuations in the transmitted power (engine torque T _E ) due to torsion. Particularly in the second embodiment, the estimated torsion angle θ _TW ̂, which is the estimated value of the torsion angle θ _TW of the torsional damper, is calculated using the estimated damper torque T _dmp ̂, which is the estimated torque of the transmission mechanism. Output limitation of the engine 17 and the like is performed based on this torsion angle estimated value θ _TW ̂. The estimated torsion angle θ _TW ^ is a parameter that well represents the power transmission characteristics (torsion spring characteristics) of the power transmission mechanism 19, which is a torsion damper. Therefore, by using the torsion angle estimated value θ _TW ̂, it is possible to accurately detect the bottoming state of the power transmission mechanism 19 in the same manner as when the damper torque estimated value T _dmp ̂ is used as it is. As a result, the power generation system 12 can be appropriately protected by the first protection control and/or the second protection control.

In the power generation system control methods according to the above-described embodiments and the like, the power generation system 12 is mounted on the electric vehicle 100, which is a vehicle. Then, particularly in the third embodiment, when the output limitation of the engine 17 or the like is started, the output limitation is continued until the electric vehicle 100 stops or stops. This prevents hunting of the protection control, and even if the first protection control or the second protection control is executed, power generation by the power generation system 12 can be stably continued.

The power generation system control device 101 according to the above embodiment and the like includes an engine 17 that is a power source that generates power, a generator 18 that generates power using the power, a power transmission mechanism 19 that transmits the power to the power generator 18, to control a power generation system 12 having The power generation system control device 101 includes a generator torque command value T _G2 ^* that commands the torque (generator torque T _G ) to be generated by the generator 18, a rotation speed ω _G that indicates the rotation state of the generator 18, , a transmission mechanism torque estimation value (damper torque estimation value T _dmp ^), which is an estimation value of the torque transmitted by the power transmission mechanism 19, is calculated. Then, based on the damper torque estimated value T _dmp ^ that is the transmission mechanism torque estimated value, the output that limits the output of the engine 17 and the generator 18 that are the power sources, or the output of both the engine 17 and the generator 18 that are the power sources enforce limits.

As described above, in the power generation system control device 101 according to the above-described embodiments and the like, the power generation system 12 is protected from damage due to excessive torque of the transmission mechanism by control. No configuration is required to allow That is, according to the power generation system control device 101, the power generation system 12 is protected from damage due to excessive output of the engine 17 or the like, which is the power source, without requiring a configuration that enlarges the power generation system 12. FIG.

In particular, the power generation system control device 101 includes a generator controller 24 that controls the operation of the generator 18 and an engine controller 25 that is a power source controller that controls the operation of the engine 17 that is the power source. Then, the generator controller 24 calculates the damper torque estimated value T _dmp ^ which is the transmission torque estimated value. Also, the engine controller 25, which is the power source controller, limits the output of the engine 17, which is the power source, using the damper torque estimated value T _dmp ^ which is the transmission torque estimated value calculated by the generator controller 24. FIG.

Since the estimated damper torque value T _dmp ̂, which is the estimated transmission torque value, can be calculated from the rotational state of the generator 18 and the like, it is preferable that the generator controller 24 computes the estimated transmission torque value as described above. This allows the transmission torque estimate to be determined particularly accurately. As described above, by controlling the engine 17, which is the power source, using the transmission torque estimated value calculated by the generator controller 24, even when the output of the engine 17, which is the power source, is limited, the power generation system 12 can be properly protected.

Although the embodiments of the present invention have been described above, the configurations described in the above embodiments and the like only show a part of application examples of the present invention, and are not intended to limit the technical scope of the present invention.

For example, in the above embodiments and the like, the transmission mechanism torque estimator 51 that calculates the damper torque estimated value T _dmp ^ is provided in the protection controller 42 and integrated with the generator torque command value calculator 31 . That is, the damper torque estimate T _dmp ^ is estimated by the generator controller 24 . However, the transmission mechanism torque estimator 51 may be provided independently of the generator torque command value calculator 31 and the generator controller 24 . For example, a controller for estimating the damper torque estimated value T _dmp ^ may be provided in parallel with the generator controller 24 and the engine controller 25 . Also, the system controller 21 may include a controller that estimates the damper torque estimated value T _dmp ^.

Further, in the above embodiments and the like, the engine controller 25 is provided with the engine torque limit calculation section 61 . Therefore, the engine controller 25 corrects the engine torque command value T _E1 ^* calculated by the power generation control unit 26 to the final engine torque command value T _E2 ^* within the engine controller 25 . However, the engine torque limit calculation section 61 may be provided in the system controller 21 . Also, the power generation control unit 26 may have the function of the engine torque limit calculation unit 61 . In these cases, when executing the first protection control, the system controller 21 or the power generation control unit 26 calculates the final engine torque command value T _E2 ^* for the first protection control. Then, the engine controller 25 acquires the final engine torque command value T _E2 ^* from the beginning, and drives the engine 17 accordingly.

In addition, although the power generation system 12 and the power generation system control device 101 are mounted on the electric vehicle 100 in the above embodiments and the like, the present invention is not limited to this. That is, the power generation system control method and the power generation system control device 101 according to the above-described embodiments and the like are also suitable for the power generation system 12 and the power generation system control device 101 that are not mounted on the electric vehicle 100 . Further, the power generation system control method according to the above-described embodiments and the like is also suitable when the power generation system is mounted on a vehicle other than the electric vehicle 100 .

The power generation system control method according to the above-described embodiments and the like is particularly suitable for a small power generation system 12 in which the engine 17 and the generator 18 are directly connected. and other large power generation systems. In this case, the power generation system becomes relatively large, but the power generation system is protected without slipping the friction clutch by the power generation system control method according to the above embodiment. Therefore, there is an advantage that wear of the friction clutch is reduced.

In addition, in the power generation system control methods according to the above-described embodiments and the like, the rotation speed ω _G of the generator 18 is used as a parameter representing the rotation state of the generator 18, but instead of the rotation speed ω _G Speed, other parameters that are correlated with the number of revolutions, etc. can be used.

12: power generation system, 17: engine, 18: generator, 19: power transmission mechanism, 24: generator controller, 25: engine controller, 26: power generation control unit, 42: protection control unit, 51: transmission mechanism torque estimation unit , 52: excessive torque detection unit, 53: generator torque limit calculation unit, 61: engine torque limit calculation unit, 100: electric vehicle, 101: power generation system control device

Claims (15)

A power generation system control method for controlling a power generation system having a power source that generates power, a generator that generates power using the power, and a power transmission mechanism that transmits the power to the power generator,
A transmission mechanism torque estimation value, which is an estimated value of the transmission mechanism torque generated in the power transmission mechanism, based on a generator torque command value that commands the torque to be generated by the generator and the rotation state of the generator. calculate,
performing power limiting to limit the output of the power source, the generator, or both the power source and the generator based on the transmission mechanism torque estimate;
Power generation system control method. The power generation system control method according to claim 1,
performing the power limitation for at least the power source based on the transmission mechanism torque estimate;
Power generation system control method. The power generation system control method according to claim 1 or 2,
performing the output limitation on at least the generator based on the transmission mechanism torque estimate;
Power generation system control method. The power generation system control method according to any one of claims 1 to 3,
The transmission mechanism torque estimated value is calculated by the deviation between the torque of the generator determined by the generator torque command value and the torque determined by the actual rotation speed of the generator,
Power generation system control method. The power generation system control method according to any one of claims 1 to 4,
The output limitation is executed when the transmission mechanism torque estimated value becomes equal to or greater than a predetermined threshold.
Power generation system control method. The power generation system control method according to claim 5,
Determining whether or not the transmission mechanism torque estimated value is greater than or equal to the threshold is performed by comparing the maximum value of the transmission mechanism torque estimated value within a predetermined time period with the threshold.
Power generation system control method. The power generation system control method according to claim 5 or 6,
The threshold is set to a limit value of the transmission mechanism torque at which the power transmission mechanism can be linearly deformed.
Power generation system control method. The power generation system control method according to claim 7,
When the limit value varies due to manufacturing errors in the power transmission mechanism, the threshold value is set to a lower limit value in the range of variations due to the manufacturing error.
Power generation system control method. The power generation system control method according to any one of claims 1 to 8,
When the output of both the power source and the generator is limited by the output limitation, the output limitation is set so that the torque of the power source becomes smaller than the generator torque, which is the torque of the generator. executed,
Power generation system control method. The power generation system control method according to any one of claims 1 to 9,
When the output of both the power source and the generator is limited by the output limitation, after executing the output limitation of the power source, the output limitation of the generator is performed secondarily.
Power generation system control method. The power generation system control method according to any one of claims 1 to 10,
The power transmission mechanism is a damper that moderates changes in the power and transmits the power to the generator.
Power generation system control method. The power generation system control method according to any one of claims 1 to 11,
The power transmission mechanism is a torsion damper that reduces fluctuations in the power transmitted by torsion,
calculating a torsion angle estimate, which is an estimate of the torsion angle of the torsion damper, using the transmission mechanism torque estimate;
The output limitation is performed based on the torsion angle estimate.
Power generation system control method. The power generation system control method according to any one of claims 1 to 12,
The power generation system is mounted on a vehicle,
Once the output limitation is initiated, the output limitation continues until the vehicle stops or stops.
Power generation system control method. A power generation system control device for controlling a power generation system having a power source that generates power, a generator that generates power using the power, and a power transmission mechanism that transmits the power to the power generator,
Calculating a transmission mechanism torque estimation value, which is an estimated value of the torque transmitted by the power transmission mechanism, based on a generator torque command value that commands the torque to be generated by the generator and the rotation state of the generator. death,
performing power limiting to limit the output of the power source, the generator, or both the power source and the generator based on the transmission mechanism torque estimate;
Power generation system controller. The power generation system control device according to claim 14,
a generator controller that controls the operation of the generator;
a power source controller that controls the operation of the power source;
with
the generator controller computing the transmission mechanism torque estimate;
wherein the power source controller limits the output of the power source using the transmission torque estimate calculated by the generator controller;
Power generation system controller.

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