JP2017027769A - Fuel battery system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel battery system that can acquire the rotational frequencies of a driving motor, a hydrogen pump and an air compressor with high accuracy while suppressing increase of the number of parts and increase of the cost.SOLUTION: In a fuel battery system comprising a hydrogen pump, an air compressor, a driving device for the hydrogen pump and the compressor, a control device for controlling the driving device, and a fuel battery, the driving device includes a driving motor for the hydrogen pump and the compressor, and a power distribution mechanism for distributing the power from the drive motor to the hydrogen pump and the compressor at a predetermined rotational frequency distribution ratio. The control device calculates the rotational frequency of the compressor from the intake flow rate of the compressor and the supplied air pressure from the compressor to the fuel battery. On the basis of the rotational frequency of the compressor, the detection value of any one of the rotational frequency of the driving motor and the rotational frequency of the hydrogen pump, and the rotational frequency distribution ratio of the power distribution mechanism, the control device calculates the rotational frequency of the other of the rotational frequency of the driving motor and the rotational frequency of the hydrogen pump.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a fuel cell system.

  Conventionally, a hydrogen pump that sends an anode gas (hydrogen gas) containing hydrogen to a fuel cell, an air compressor that sends air (cathode gas) to the fuel cell, and a fuel that includes a single drive motor that drives them A fuel cell system having a battery gas supply system is known.

  In the fuel cell system described above, in order to control the rotation of the hydrogen pump and the air compressor by the drive motor, it is necessary to detect the rotation speed of the drive motor, the rotation speed of the hydrogen pump, and the rotation speed of the air compressor as control parameters. is there. These rotational speeds are measured by rotational speed sensors provided at various places.

  Patent Document 1 describes a rotation speed sensor that detects the rotation speed of a rotation detection object such as a compressor impeller. In the rotation speed sensor of Patent Document 1, an eddy current is generated in the rotation detection target, and the rotation speed of the rotation detection object is detected based on the inductance change of the coil used for excitation.

Japanese Unexamined Patent Publication No. 2015-34780

  In the fuel cell system, when the conventional rotational speed sensor represented by Patent Document 1 is installed at various locations of the drive motor, the hydrogen pump, and the air compressor, there is a problem that the number of parts increases and the cost increases. On the other hand, in order to prevent the increase in the number of parts and the cost increase, it is conceivable to substitute measurement parameters such as output current and impedance of the fuel cell as control parameters instead of using the rotation speed as a parameter. However, when such a substitute control parameter is used, there is a concern that the control accuracy is deteriorated or the response is deteriorated.

  The present invention has been made in view of such circumstances, and an object of the present invention is to acquire the rotational speeds of the drive motor, the hydrogen pump, and the air compressor with high accuracy while suppressing an increase in the number of parts and cost. It is an object of the present invention to provide a fuel cell system that can handle the above.

  A fuel cell system according to an aspect of the present invention includes a hydrogen pump, an air compressor, a driving device for the hydrogen pump and the air compressor, a control device for controlling the driving device, and hydrogen gas and air sent from the hydrogen pump. And a fuel cell that generates electricity using air sent from the compressor. The drive device also includes a drive motor that drives the hydrogen pump and the air compressor, and a power distribution mechanism that distributes the power from the drive motor to the hydrogen pump and the air compressor at a predetermined rotation speed distribution ratio. Then, the control device calculates the rotation speed of the air compressor from the intake air flow rate of the air compressor and the supply air pressure that is the pressure of the air supplied from the air compressor to the fuel cell. Further, the drive device determines the drive motor based on the calculated value of the rotation speed of the air compressor, the detected value of the rotation speed of the drive motor or the rotation speed of the hydrogen pump, and the rotation speed distribution ratio of the power distribution mechanism. The other rotation number in the rotation number or the rotation number of the hydrogen pump is calculated.

  According to the fuel cell gas supply system, since the rotation speed of the air compressor can be calculated from the intake air flow rate and supply air pressure of the air compressor, the rotation sensor of the air compressor can be omitted. Then, based on the calculated value of the rotation speed of the air compressor, the rotation speed of the drive motor or the rotation speed of the hydrogen pump, and the rotation speed distribution ratio of the power distribution mechanism, the rotation speed of the drive motor is calculated. Therefore, at least one rotation sensor of the drive motor or the hydrogen pump can be omitted. Therefore, it is possible to prevent an increase in the number of parts and the cost due to the installation of a large number of rotation sensors, and it is possible to acquire the rotation speed, which is the required parameter itself, instead of the above-described substitute parameter. Deterioration of responsiveness is also prevented.

FIG. 1 is a schematic configuration diagram of a fuel cell system according to an embodiment of the present invention. FIG. 2 is a diagram illustrating the configuration of the fuel cell gas supply system according to the embodiment of the present invention. FIG. 3 is a flowchart showing a flow of calculating the rotation speeds of the air compressor and the hydrogen pump. FIG. 4 is a diagram illustrating an example of a compressor map. FIG. 5 is a diagram illustrating an example of a collinear diagram of the planetary gear mechanism.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram illustrating a configuration of a vehicle fuel cell system 100 according to an embodiment of the present invention.

  As illustrated, the fuel cell system 100 includes a fuel cell 10, a hydrogen supply source 12, a fuel cell gas supply system 1, a controller 22, an intake flow rate detection sensor 90, and an air pressure sensor 92. ing.

  The fuel cell 10 is configured as a fuel cell stack formed by stacking a plurality of fuel cells, for example. The fuel cell 10 receives supply of anode gas (hydrogen gas) and cathode gas (air), and generates electric power necessary for traveling of the vehicle. This generated power is used by, for example, various auxiliary machines (not shown) and wheel driving motors that operate the fuel cell system 100 in a starting state.

  The hydrogen supply source 12 is a supply source that supplies anode gas to the fuel cell 10 and is configured as a gas storage container that stores the anode gas in a high-pressure state. The supply amount of the anode gas from the hydrogen supply source 12 to the fuel cell 10 is adjusted by an anode gas pressure regulating valve (not shown) provided in the anode gas supply passage 30.

  An ejector 31 is disposed in the anode gas supply passage 30. The ejector 31 increases the speed of the anode gas supplied from the hydrogen supply source 12 by a throttle unit (not shown) in the ejector 31 so that the entrapping force acts on the anode gas flowing through the circulating anode gas supply channel 34.

  The fuel cell gas supply system 1 includes a hydrogen pump 14, an air compressor 16, and a drive device 18.

  The hydrogen pump 14 takes in the anode off-gas discharged without being consumed in the fuel cell 10 through the anode off-gas circulation passage 32 and supplies it to the anode gas supply passage 30 through the circulation anode gas supply passage 34. That is, the hydrogen pump 14 circulates the anode gas with respect to the fuel cell 10.

  The air compressor 16 sucks outside air and pumps the air to the fuel cell 10 via the cathode gas supply passage 36. The cathode gas supply passage 36 is provided with a gas filter for trapping foreign matter in the air discharged from the air compressor 16 and a gas cooler for cooling the cathode gas, if necessary.

  The driving device 18 is a device that drives the hydrogen pump 14 and the air compressor 16. Details of the configuration of the driving device 18 will be described later.

  A hydrogen pump side clutch 21 is provided between the driving device 18 and the hydrogen pump 14. Further, a compressor side clutch 23 is provided between the driving device 18 and the air compressor 16. Thus, transmission / non-transmission of power from the drive unit 18 to the hydrogen pump 14 and the air compressor 16 can be switched by engaging / disengaging the hydrogen pump side clutch 21 and the compressor side clutch 23, respectively.

  The controller 22 includes a microcomputer having input / output means such as an I / O port, calculation / control means such as an MPU, and storage means such as a memory, and is based on the target rotational speed of the hydrogen pump 14 and the air compressor 16. Various controls in the fuel cell system 100 such as rotation speed control are performed. Further, the controller 22 performs control related to engagement / disconnection of the hydrogen pump side clutch 21 and the compressor side clutch 23 and braking of the compressor input shaft brake 43, the servo brake mechanism 72, and the hydrogen pump input shaft brake 82.

The intake flow rate detection sensor 90 is provided at the outside air intake port of the air compressor 16 and detects the flow rate of the air sucked into the air compressor 16 from the outside air, and this detected value (hereinafter also referred to as the intake flow rate detected value Q _int ). Is output to the controller 22. The air pressure sensor 92 is provided in the cathode gas supply passage 36 and detects the pressure of the compressed air supplied from the air compressor 16 to the fuel cell 10, and this detected value (hereinafter also referred to as a supplied air pressure detected value _Ppro ). ) To the controller 22.

  FIG. 2 is a diagram illustrating the configuration of the fuel cell gas supply system 1.

  As shown in the figure, the drive device 18 of the fuel cell gas supply system 1 is mainly connected to the drive motor 40, the shifting planetary gear mechanism 42 connected to the driving motor 40, and the shifting planetary gear mechanism 42. And a power distribution planetary gear mechanism 44 as a power distribution mechanism. In the drive device 18, the compressor input shaft 41, which is the input shaft of the compressor 16, extends so as to penetrate through the central portions of the drive motor 40, the transmission planetary gear mechanism 42, and the power distribution planetary gear mechanism 44. . Further, a compressor input shaft brake 43 composed of a wet multi-plate brake or the like that reduces the rotational speed of the compressor input shaft 41 is disposed near the compressor 16 of the drive device 18.

  The drive motor 40 has a cylindrical stator 45 around which a winding (not shown) is wound, and a motor output shaft 46 as a rotor disposed in the center of the cylindrical stator 45. The drive motor 40 is controlled by the inverter 49 based on a command from the controller 22, and is driven by a high-power battery (not shown) provided in the fuel cell system 100, for example. The motor output shaft 46 of the drive motor 40 is provided with a motor rotation speed sensor 51 that detects a motor rotation speed that is the rotation speed of the motor output shaft 46.

  An oil pump 47 is installed on the motor output shaft 46. The oil pump 47 is selectively driven in response to the rotational driving force of the motor output shaft 46, and supplies oil to the motor output shaft 46 to achieve smooth rotation.

  The motor output shaft 46 has a forward rotation one-way clutch 48 engaged on the outer peripheral side of the tip 46a, and a reverse rotation one-way clutch 50 engaged on the inner peripheral side of the tip 46a.

  The forward rotation one-way clutch 48 is a well-known one-way clutch constituted by a sprag type or a cam type, and the motor output shaft 46 is rotated only when the motor output shaft 46 is rotated forward (counterclockwise as viewed from the stator 45). Power is transmitted to the first internal gear 52. That is, the forward rotation one-way clutch 48 does not transmit power from the motor output shaft 46 to the first internal gear 52 when the motor output shaft 46 rotates in the reverse direction (clockwise as viewed from the stator 45).

  The reverse one-way clutch 50 is a known one-way clutch constituted by a sprag type or a cam type, and engages with the inner peripheral surface of the motor output shaft 46 and also with the outer peripheral surface of the compressor input shaft 41. The reverse one-way clutch 50 transmits the power of the motor output shaft 46 to the compressor input shaft 41 only when the motor output shaft 46 is reversely rotated. That is, the reverse one-way clutch 50 does not transmit power from the motor output shaft 46 to the compressor input shaft 41 when the motor output shaft 46 is rotating forward.

  The transmission planetary gear mechanism 42 includes a first internal gear 52 that engages with the forward rotation one-way clutch 48 at an inner peripheral end 52a, and a first planetary gear that engages at the inner peripheral side of the other end 52b of the first internal gear 52. It has a gear 54 and a first sun gear 56 meshed with the inner periphery of the first planetary gear 54.

  The first internal gear 52 follows the rotation of the forward one-way clutch 48 meshed with the inner peripheral side of one end 52a thereof. Accordingly, the power transmitted from the forward one-way clutch 48 to the first internal gear 52 is transmitted to the first planetary gear 54 meshed with the inner peripheral side of the other end 52b of the first internal gear 52.

  The first planetary gear 54 rotates or revolves following the first internal gear 52. The power of the first planetary gear 54 is transmitted to the first sun gear 56 meshed with the first planetary gear 54.

  The first planetary gear 54 is provided with a first planetary carrier 57. Further, the first planetary carrier 57 is provided with a first planetary carrier brake 60 that stops the rotation of the first planetary carrier 57 and stops the revolution of the first planetary gear 54. That is, when the rotation of the first planetary carrier 57 is stopped by the first planetary carrier brake 60, only the rotation of the first planetary gear 54 is allowed.

  In the present embodiment, basically, it is assumed that the speed change planetary gear mechanism 42 is used for increasing the rotation of the motor output shaft 46. In this case, the first planetary carrier brake 60 The rotation of the first planetary carrier 57 is maintained in a fixed state, and only the first planetary gear 54 is allowed to rotate.

  The first sun gear 56 is driven by the rotation and revolution of the first planetary gear 54 meshed with the outer peripheral side thereof. Further, the first sun gear 56 is integrated with a second internal gear 70 of the power distribution planetary gear mechanism 44 described later via the first sun gear shaft 56a. Therefore, the power transmitted from the first planetary gear 54 to the first sun gear 56 is transmitted to the second internal gear 70 via the first sun gear shaft 56a.

  In the present embodiment, speed ratio information determined based on the number of teeth of the first internal gear 52, the first planetary gear 54, and the first sun gear 56 of the speed change planetary gear mechanism 42 is stored in the storage area of the controller 22. Has been. Here, the transmission ratio information is the ratio of the output rotational speed to the rotational speed of the input to the transmission planetary gear mechanism 42 calculated from the number of teeth of each gear 52, 54, and 56.

  The power distribution planetary gear mechanism 44 meshes with the second internal gear 70 integrated with the first sun gear 56 via the first sun gear shaft 56a and the inner peripheral teeth of the second internal gear 70 as described above. A second planetary gear 74 and a second sun gear 76 meshing with the second planetary gear 74 on the inner peripheral side.

  Since the second internal gear 70 is configured to be integrated via the first sun gear 56 and the first sun gear shaft 56 a as described above, it is driven at the same rotational speed as the first sun gear 56. A servo brake mechanism 72 is arranged on the outer periphery of the second internal gear 70. The servo brake mechanism 72 stops the rotation of the second internal gear 70 as necessary and makes it fixed.

  Since the second planetary gear 74 is meshed with the inner peripheral teeth of the second internal gear 70 as described above, the second planetary gear 74 rotates or revolves following the second internal gear 70. Further, the second planetary gear 74 is supported by the second planetary carrier 78. The second planetary carrier 78 is integrated with the hydrogen pump input shaft 80 of the hydrogen pump 14. Accordingly, the second planetary carrier 78 integrated with the hydrogen pump input shaft 80 is rotated by the revolution of the second planetary gear 74, so that power is transmitted to the hydrogen pump 14.

  Further, the hydrogen pump input shaft 80 is provided with a hydrogen pump input shaft brake 82 and a hydrogen pump side clutch 21. The hydrogen pump input shaft brake 82 is constituted by a multi-plate wet brake, for example, and stops the rotation of the second planetary carrier 78. When the rotation of the second planetary carrier 78 is stopped by the hydrogen pump input shaft brake 82, the power transmitted from the second internal gear 70 to the second planetary gear 74 is not transmitted to the second planetary carrier 78, It is transmitted only to the second sun gear 76 described later. Further, the hydrogen pump side clutch 21 switches between a transmission state and a non-transmission state of power to the hydrogen pump 14 by engagement / disconnection.

  In the present embodiment, the second sun gear 76 is integrally formed at the tip of the compressor input shaft 41 of the air compressor 16 and meshes with the inner peripheral side of the second planetary gear 74. Therefore, the second sun gear 76 rotates following the rotation or revolution of the second planetary gear 74, so that power is transmitted to the air compressor 16 via the compressor input shaft 41. The compressor input shaft 41 is provided with a compressor input shaft brake 43 and a compressor side clutch 23.

  The compressor input shaft brake 43 is constituted by, for example, a multi-plate wet brake, and stops the rotation of the compressor input shaft 41. When the compressor input shaft brake 43 stops the rotation of the compressor input shaft 41, the rotation of the second sun gear 76 is fixed, and the power transmitted from the second internal gear 70 to the second planetary gear 74 described above is The second sun gear 76 is not transmitted, but is transmitted only to the second planetary carrier 78. In the present embodiment, the compressor input shaft brake 43 can continuously adjust the braking force against the rotation of the compressor input shaft 41, and the adjustment from the second planetary gear 74 to the second sun gear 76 can be performed by adjusting the braking force. The power transmission amount and the power transmission amount from the second planetary gear 74 to the second planetary carrier 78 can be arbitrarily adjusted.

  In the present embodiment, the controller 22 causes the drive motor 40 to rotate forward during normal startup of the fuel cell system 100 or during normal operation after startup.

  During normal rotation of the drive motor 40, the power of the motor 40 is supplied from the motor output shaft 46, the normal rotation one-way clutch 48, the first internal gear 52, the first planetary gear 54, the first sun gear 56, the first sun gear shaft 56a, and the second. This is transmitted to the hydrogen pump 14 via the internal gear 70, the second planetary gear 74, the second planetary carrier 78, and the hydrogen pump input shaft 80. On the other hand, the power transmitted to the second planetary gear 74 is also transmitted to the compressor input shaft 41 via the second sun gear 76.

  As a result, rotation of the drive motor 40 due to forward rotation is caused by the shifting planetary gear mechanism 42 constituted by the first internal gear 52, the first planetary gear 54, and the first sun gear 56 via the forward rotation one-way clutch 48. The speed is changed (increased).

In this embodiment, the distribution ratio information of the rotational speed determined based on the number of teeth of the second internal gear 70, the second planetary gear 74, and the second sun gear 76 of the power distribution planetary gear mechanism 44 is obtained from the controller 22. It is stored in the storage area. Here, the rotational speed distribution ratio information is the compressor input shaft 41 with respect to the rotational speed of the input to the power distribution planetary gear mechanism 44 calculated from the number of teeth of each gear 70, 74, and 76. the ratio of the rotational speed of the power output (compressor rotational speed N corresponding to _c) the rotational speed of the power output to the hydrogen pump input shaft 80 (corresponding to the hydrogen pump speed N _h) to.

  In particular, in the present embodiment, the amount of power transmitted to the air compressor 16 can be adjusted by adjusting the braking force of the compressor input shaft brake 43 by the compressor input shaft brake 43. Further, the amount of power transmitted to the hydrogen pump 14 may be adjusted by adjusting the amount of stoppage of the hydrogen pump input shaft 80 by the hydrogen pump input shaft brake 82.

  Therefore, the power transmitted from the second planetary gear 74 to the hydrogen pump 14 through the second planetary carrier 78 and the like by appropriately adjusting the braking force by the compressor input shaft brake 43 and the braking force by the hydrogen pump input shaft brake 82. And the distribution of the rotational speed of the power transmitted from the second planetary gear 74 to the air compressor 16 via the second sun gear 76 and the like can be suitably adjusted.

  For example, when the generated water is frozen in the hydrogen pump 14, the fuel cell system 100 is operated in the “freezing and pulverizing operation mode” in which the drive motor 40 is reversed to pulverize the freezing in the hydrogen pump 14. It may be activated. During the reverse rotation of the drive motor 40, the power of the motor 40 is transmitted to the second sun gear 76 via the motor output shaft 46, the reverse one-way clutch 50, and the compressor input shaft 41. The power transmitted to the second sun gear 76 is transmitted to the hydrogen pump 14 via the second planetary gear 74 and the second planetary carrier 78 (hydrogen pump input shaft 80).

  In the fuel cell gas supply system 1 having the above-described configuration, hydrogen is appropriately controlled according to the operating state of the fuel cell system 100 by controlling the rotation of the drive motor 40 by the controller 22 and the inverter 49 and by distributing power by the planetary gear mechanism 44 for power distribution. The power (rotation speed and torque) transmitted to the pump 14 and the air compressor 16 can be adjusted. Therefore, power can be transmitted to the hydrogen pump 14 and the air compressor 16 by one drive motor 40 without separately providing motors for driving the hydrogen pump 14 and the air compressor 16.

In the fuel cell gas supply system 1, the motor rotation speed detection value N _m is acquired. In addition, the compressor rotation speed N _c of the air compressor 16 and the hydrogen pump rotation speed N _h of the hydrogen pump 14 are It must be detected as a control parameter. However, if a rotation speed sensor is also installed in the air compressor 16 and the hydrogen pump 14 to detect these, there is a concern about an increase in the number of parts and cost. On the other hand, the present inventor has come up with a method capable of acquiring these rotation speeds N _c and N _h without installing a rotation speed sensor in the air compressor 16 and the hydrogen pump 14. Below, the detail is demonstrated.

FIG. 3 is a flowchart for explaining the flow of calculating the compressor rotation speed N _c and the hydrogen pump rotation speed N _{h according} to the present embodiment.

  Furthermore, in the following, it is assumed that the fuel cell system 100 is in operation and the hydrogen pump side clutch 21 and the compressor side clutch 23 are both engaged and the drive motor 40 is rotating forward. For simplicity of explanation, both the compressor input shaft brake 43 and the hydrogen pump input shaft 80 are not braked, and these affect the calculated values of the rotation speeds of the air compressor 16 and the hydrogen pump 14. Make it not exist.

In step S101, the controller 22 obtains the motor rotation speed detection value N _m of the drive motor 40 from the motor rotation sensor 51.

In step S <b> 102, the controller 22 acquires the intake flow rate detection value Q _int of the air compressor 16 from the intake flow rate detection sensor 90.

In step S <b> 103, the controller 22 acquires a supply air pressure detection value P _pro of compressed air supplied from the air compressor 16 to the fuel cell 10 from the air pressure sensor 92.

In step S104, the controller 22 determines the compressor speed of the air compressor 16 based on the motor speed detection value N _m , the intake flow rate detection value Q _int , and the supply air pressure detection value P _pro acquired in steps S101 to S103. N _c is calculated.

More specifically, the intake air flow rate detection value Q _int and the supply air pressure detection value P _pro are applied to a known compressor operation characteristic diagram (compressor map) representing the relationship between the flow rate, pressure, and compressor rotation speed, and the compressor rotation speed is applied. _Nc is determined.

FIG. 4 shows an example of a compressor map that matches the characteristics of the air compressor 16. As understood from the figure, when the intake flow rate detection value Q _int and the supply air pressure detection value P _pro are obtained, the intake flow rate detection value Q _int and the supply air pressure detection value P _pro are excluded. If the supply air pressure ratio divided by the atmospheric pressure is applied to the compressor map, the compressor rotational speed _Nc can be obtained.

Returning to FIG. 3, in step S < _b > 105, the controller 22 detects the motor rotation speed detection value N _m acquired in step S < _b > 101, the compressor rotation speed N _c calculated in step S < _b > 104, the gear ratio information of the transmission planetary gear mechanism 42, and the power The hydrogen pump rotation speed N _h is calculated based on the distribution ratio information of the rotation speed of the distribution planetary gear mechanism 44.

Specifically, the controller 22 first refers to the motor rotation speed detection value N _m and the gear ratio information of the planetary gear mechanism 42 for speed change, and starts from the motor output shaft 46 shown in FIG. The rotational speed of the power input to the first internal gear 52 is equal to the rotational speed N _m ′ of the power output to the first sun gear 56 via the first planetary gear 54 (= the power input to the second internal gear 70). Rotational speed) is calculated.

In the present embodiment, since the first planetary carrier 57 is fixed by the first planetary carrier brake 60 as described above, if calculation is performed based on a known speed ratio aspect in the planetary gear mechanism, the first internal gear 52 Is increased by _a factor of Z _c / Z _a and output to the first sun gear 56. However, Z _a means the number of teeth of the first sun gear 56, and Z _c means the number of teeth of the first internal gear 52.

Therefore, power of the driving motor 40, the rotational speed through a change speed planetary gear mechanism 42 is output from the Z _c / Z _a multiplied by a first sun gear 56, the second internal gear 70 of the power distribution planetary gear mechanism 44 Will be input.

Then, the controller 22 calculates the rotation speed N _m ′ of the input power to the power distribution planetary gear mechanism 44, the compressor rotation speed N _c , and the distribution ratio of the rotation speed of the power distribution planetary gear mechanism 44. From the information, the rotational speed of the power output to the second planetary carrier 78 (hydrogen pump input shaft 80), that is, the hydrogen pump rotational speed _Nh is calculated.

In the present embodiment, in particular, the hydrogen pump rotational speed N _h is the distribution ratio information of the rotational speed of the power distribution planetary gear mechanism 44, particularly the number of teeth of the second internal gear 70, the second planetary gear 74, and the second sun gear 76. It is calculated using a collinear diagram of the planetary gear mechanism determined based on the above.

FIG. 5 shows an example of a collinear diagram of a planetary gear mechanism that matches the characteristics of the power distribution planetary gear mechanism 44. As understood from the figure, when the compressor rotation speed N _c (rotation speed of the second sun gear 76) and the rotation speed N _m ′ of the input power (rotation speed of the second internal gear 70) are determined, the hydrogen pump rotation The number N _h (the number of rotations of the second planetary carrier 78) is determined.

  According to the fuel cell system 100 according to the above-described embodiment, the following effects can be obtained.

In the fuel cell system 100 according to the present embodiment, the hydrogen pump 14, the air compressor 16, the drive device 18 for the hydrogen pump 14 and the air compressor 16, the controller 22 for controlling the drive device 18, and the hydrogen pump 14 And a fuel cell 10 that generates electricity using the hydrogen gas sent out and the air sent out from the air compressor 16. The drive device 18 is a drive motor 40 that drives the hydrogen pump 14 and the air compressor 16 and power as a power distribution mechanism that distributes the power from the drive motor 40 to the hydrogen pump 14 and the air compressor 16 at a predetermined rotation speed distribution ratio. And a planetary gear mechanism 44 for distribution. Further, the controller 22 as a control device includes an intake air flow rate detection value Q _int that is an intake air flow rate of the air compressor 16 and a supply air pressure that is a pressure of air supplied from the air compressor 16 to the fuel cell 10 (supply air pressure detection value). The compressor rotation speed N _c that is the rotation speed of the air compressor 16 is calculated from P _pro ) (step S105 in FIG. 3). Further, the controller 22 is based on the calculated compressor rotation speed N _c , the motor rotation speed detection value N _m that is a detection value of the rotation speed of the drive motor 40, and the rotation speed distribution ratio of the power distribution planetary gear mechanism 44. Then, the hydrogen pump rotational speed N _h that is the rotational speed of the hydrogen pump 14 is calculated (step S106).

According to this, since the compressor rotation speed N _c can be calculated from the intake flow rate detection value Q _{int of} the air compressor 16 and the supply air pressure detection value P _pro , the rotation sensor provided in the air compressor 16 can be omitted. . Then, the hydrogen pump rotation speed N _h is calculated based on the compressor rotation speed N _c calculated in this way, the motor rotation speed detection value N _m , and the rotation speed distribution ratio of the power distribution planetary gear mechanism 44. The rotation sensor of the hydrogen pump 14 can be omitted. Therefore, it is possible to prevent the increase in the number of parts and the cost due to the installation of a large number of rotation sensors, and it is possible to obtain the rotation speed that is the required parameter itself, not the substitute parameter, so that the control accuracy is reduced and the responsiveness is reduced. Deterioration is also prevented.

In the fuel cell system 100 according to the present embodiment, the power input from the drive motor 40 is shifted between the drive motor 40 and the power distribution planetary gear mechanism 44 and output to the power distribution planetary gear mechanism 44. change speed planetary gear mechanism 42 as a transmission mechanism is provided to the controller 22, the calculation of the above-described hydrogen pump speed N _h, using the gear ratio information of the transmission planetary gear mechanism 42 (step S106).

According to this, the difference between the output rotational speed of the drive motor 40 and the required target rotational speed of the hydrogen pump 14 or the air compressor 16 is suitably compensated by shifting the power of the drive motor 40 with the planetary gear mechanism 42 for shifting. even while, by using the speed change ratio information of the transmission planetary gear mechanism 42, the power after shifting the power of the driving motor 40 from the motor rotation speed detection value N _m (that is, the input power to the power distribution planetary gear mechanism 44) it is possible to determine the rotational speed N _m ', the calculation accuracy of the above hydrogen pump speed N _h is maintained.

  Since the required target rotational speed of the hydrogen pump 14 and the air compressor 16 is generally higher than the output rotational speed of the drive motor 40, the speed change planetary gear mechanism 42 as in the present embodiment. Is preferably used to increase the power of the drive motor 40.

Further, in the fuel cell system 100 according to the present embodiment, the controller 22 applies the intake flow rate detection value Q _int and the supply air pressure detection value P _pro to the compressor operation characteristic diagram (FIG. 4) to determine the compressor rotation speed N _c . Calculate (step S105).

Thereby, calculation of the compressor rotation speed _Nc based on the intake flow rate detection value Q _int and the supply air pressure detection value P _pro can be easily performed using the existing compressor operation characteristic diagram without performing complicated calculation. .

In the fuel cell system 100 according to the present embodiment, the power distribution planetary gear mechanism 44 is constituted by a planetary gear mechanism. Then, the controller 22 determines the rotation speed N _m ′ of the input power to the power distribution planetary gear mechanism 44 obtained from the motor rotation speed detection value N _m of the drive motor 40 and the compressor rotation speed N _c for both the planetary gear mechanism. is applied to the diagram (Fig. 5), it calculates a hydrogen pump speed N _h (step S106).

Thus, the calculation of the rotation speed N _m ′ of the input power to the planetary gear mechanism 44 for power distribution and the rotation speed N _h of the hydrogen pump based on the compressor rotation speed N _c can be performed without performing complicated calculations. This can be done easily using the alignment chart of the mechanism.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

For example, in the present embodiment acquires the motor rotation speed detection value N _m provided motor rotational speed sensor 51 to the drive motor 40 without providing a rotation sensor to the hydrogen pump 14, the motor rotation speed detection value N _m, the compressor The hydrogen pump rotation speed N _h is calculated based on the rotation speed N _c , the transmission gear ratio information of the transmission planetary gear mechanism 42, and the rotation speed distribution ratio information of the power distribution planetary gear mechanism 44.

However, instead of providing the rotation sensor 51 in the drive motor 40, a rotation sensor may be provided in the hydrogen pump 14 to detect the rotation speed of the hydrogen pump 14. In this case, instead of the above-described step S106, the controller 22 performs power distribution based on the detected value of the rotation speed of the hydrogen pump 14, the compressor rotation speed N _c , and the alignment chart of the planetary gear mechanism shown in FIG. The rotational speed N _m ′ of the input power to the planetary gear mechanism 44 is calculated, and the rotational speed of the motor output shaft 46 (the rotational speed of the drive motor 40) is calculated with reference to the gear ratio information of the shifting planetary gear mechanism 42. The process to do is performed.

Further, the shifting planetary gear mechanism 42 in the above embodiment may be omitted. That is, the forward rotation one-way clutch 48 and the second internal gear 70 are configured as an integral rotation transmission member, and the power transmitted from the drive motor 40 to the forward rotation one-way clutch 48 is transmitted to the second internal gear via the rotation transmission member. It may be input to the lugia 70. In this case, since the rotation speed of the input power to the power distribution planetary gear mechanism 44 matches the rotation speed of the drive motor, it is not necessary to consider the gear ratio information of the transmission planetary gear mechanism 42, and hydrogen The calculation of the pump speed N _h or the speed of the drive motor 40 becomes easier.

  Further, the number of teeth of each internal gear 52, 70, each planetary gear 54, 74, and each sun gear 56, 76 in the transmission planetary gear mechanism 42 or the power distribution planetary gear mechanism 44 is determined in each mode. The speed can be set as appropriate according to the motor speed, the torque required for the hydrogen pump 14 and the air compressor 16, and the speed.

  Further, instead of the shifting planetary gear mechanism 42 of the present embodiment, other existing shifting mechanisms may be used. Furthermore, instead of the power distribution planetary gear mechanism 44, another existing power distribution mechanism may be used.

DESCRIPTION OF SYMBOLS 1 Fuel cell gas supply system 10 Fuel cell 14 Hydrogen pump 16 Air compressor 18 Drive apparatus 22 Controller (control apparatus)
40 drive motor 41 compressor input shaft 42 speed change mechanism 43 compressor input shaft brake 44 power distribution planetary gear mechanism 44
46 Motor output shaft 51 Motor rotation speed sensor 51
80 Hydrogen pump input shaft 90 Intake flow rate detection sensor 92 Air pressure sensor 100 Fuel cell system

Claims (4)

Electricity is generated by a hydrogen pump, an air compressor, a drive device for the hydrogen pump and the air compressor, a control device for controlling the drive device, hydrogen gas sent from the hydrogen pump and air sent from the air compressor A fuel cell system comprising: a fuel cell;
The drive device includes a drive motor that drives the hydrogen pump and the air compressor, and a power distribution mechanism that distributes power from the drive motor to the hydrogen pump and the air compressor at a predetermined rotation speed distribution ratio. And
The control device includes:
Calculating the rotational speed of the air compressor from the intake air flow rate of the air compressor and the supply air pressure which is the pressure of the air supplied from the air compressor to the fuel cell;
Based on the detected value of the rotational speed of the air compressor, the rotational speed of the drive motor or the rotational speed of the hydrogen pump, and the rotational speed distribution ratio of the power distribution mechanism, the rotational speed of the drive motor or the The fuel cell system which calculates the other rotation speed in the rotation speed of a hydrogen pump. The fuel cell system according to claim 1,
Between the drive motor and the power distribution mechanism, there is provided a speed change mechanism that shifts the power input from the drive motor and outputs it to the power distribution mechanism.
The said control apparatus is a fuel cell system which uses the gear ratio information of the said transmission mechanism for calculation of said other rotation speed. The fuel cell system according to claim 1 or 2,
The said control apparatus is a fuel cell system which calculates the rotation speed of the said air compressor by applying the said intake air flow rate and the said supply air pressure to a compressor operation characteristic figure. The fuel cell system according to any one of claims 1 to 3,
The power distribution mechanism is composed of a planetary gear mechanism,
The control device is configured to detect either the rotation speed of the input power to the power distribution mechanism or the detection value of the rotation speed of the hydrogen pump, which is obtained from the detection value of the rotation speed of the drive motor, A fuel cell system for calculating the other rotational speed by applying the rotational speed to a collinear diagram of the planetary gear mechanism.

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