JP6337913B2 - Vehicle regeneration system - Google Patents

Description

  The technology disclosed herein relates to a regenerative system for a vehicle including a high pressure accumulator that stores oil and gas under pressure.

  Conventionally, as this type of regeneration system, a regeneration system including an oil pump motor having both functions of an oil pump and a hydraulic motor is known. The high pressure accumulator is connected to the low pressure reservoir via an oil pump motor. The high pressure accumulator stores oil pressurized to high pressure, and the low pressure reservoir stores oil pressurized to low pressure.

  In this regenerative system, the power of the drive wheels is input to the oil pump motor when decelerating during downhill traveling or the like. Thereby, the oil pump motor is driven as an oil pump, and the oil in the low pressure reservoir is sent to the high pressure accumulator. As a result, the internal pressure of the high pressure accumulator rises, and the oil pressurized to a higher pressure is accumulated in the high pressure accumulator (deceleration regeneration).

  In addition, when the vehicle starts, oil from the high pressure accumulator flows out toward the low pressure reservoir. The oil pump motor is driven as a hydraulic motor by the discharge pressure of oil from the high pressure accumulator, and the power is output to the drive wheels (powering). As a result, the vehicle is hydraulically driven. And the oil which flowed out from the high pressure accumulator is collected in the low pressure reservoir.

  An example of such a regeneration system is disclosed in Patent Document 1. In addition, as a regenerative system, there is also known a system that regenerates surplus torque of the engine while the vehicle is running by using a low pressure reservoir, an oil pump motor, and a high pressure accumulator similar to those described above.

Japanese Patent Laid-Open No. 10-244858

  However, since the above-described regenerative system has only one high-pressure accumulator, the pressure state of the high-pressure accumulator and the type of energy to be regenerated, that is, whether the regenerative operation is an operation to regenerate braking torque during deceleration or the surplus of the engine Depending on whether the operation is to regenerate torque or the like, it is not possible to perform an advantageous regenerative and power running control by improving fuel efficiency such as increasing the engine operating efficiency or earning an amount of energy that can be regenerated while the vehicle is running. Therefore, there is room for improvement in such a vehicle regeneration system.

  The technology disclosed herein has been made in view of such points, and an object thereof is to provide a vehicle regeneration system that is advantageous in improving fuel efficiency.

  In order to achieve the above object, the technique disclosed herein includes at least two high pressure accumulators having different oil storage capacities, and devised how to use the two high pressure accumulators.

  Specifically, the technology disclosed herein includes an oil pump motor having both functions of an oil pump and a hydraulic motor, a low-pressure reservoir connected via the oil pump motor, and storing oil and gas under pressure. The present invention is directed to a vehicle regeneration system including a high-pressure accumulator, a regenerative operation for causing an oil pump motor to function as an oil pump, and a control device for controlling a power running operation for causing the oil pump motor to function as a hydraulic motor.

The vehicle regeneration system according to the technology of the present disclosure includes, as high pressure accumulators, a first high pressure accumulator having a relatively large oil storage capacity and a second high pressure accumulator having a relatively small oil storage capacity. . The first high pressure accumulator and the second high pressure accumulator are connected via a flow path. Control apparatus, during regenerative operation, depending on the regeneration state, the first mode using only the first high-pressure accumulator, and a second mode using only the second high-pressure accumulator, the first high-pressure accumulator and the second high-pressure At least two modes among the third mode using both of the pressure accumulators are selectively used. In the third mode, the oil stored in the second high pressure accumulator in the second mode is sent to the first high pressure accumulator through the flow path. Here, “the oil storage capacity is relatively large” and “the oil storage capacity is relatively small” means that the oil that can be stored when the oil is supplied at the same pressure by driving the oil pump motor. It means the magnitude when the amount is compared between the first high pressure accumulator and the second high pressure accumulator.

  According to this configuration, at the time of the regenerative operation, at least two modes among the first to third modes described above are selectively used according to the regenerative state. Therefore, in order to increase the engine operation efficiency by switching such a mode. It becomes possible to obtain a necessary engine load, and to efficiently perform fine regeneration and power running execution control that repeatedly performs regenerative operation and power running operation in a relatively short period of time. Thereby, the regeneration system can contribute to further improvement in fuel consumption.

The vehicle regeneration system according to the technology of the present disclosure includes a first high pressure accumulator having a relatively large oil storage capacity and a second high pressure accumulator having a relatively small oil storage capacity as the high pressure accumulator. Is provided. The regeneration system includes a first state in which oil can flow between the oil pump motor and the first high pressure accumulator, and a second state in which oil can flow between the oil pump motor and the second high pressure accumulator. Between the first switching mechanism, the third state in which oil can flow between the first high pressure accumulator and the second high pressure accumulator, and the oil between the first high pressure accumulator and the second high pressure accumulator. further Ru and a second switching mechanism for switching between the fourth state distribution of impossible.

Oil pump motor is connected to the output shaft of the engine. And a control device performs engine output regeneration which regenerates surplus torque of an engine at the time of steady run or acceleration run, and controls the 1st change mechanism and the 2nd change mechanism according to the regeneration state at the time of the engine output regeneration The first mode using only the first high pressure accumulator, the second mode using only the second high pressure accumulator, and the third mode using both the first high pressure accumulator and the second high pressure accumulator, operating efficiency Ru divided have used so as to improve. According to this configuration, it is possible to improve the engine operating efficiency while the vehicle is running and to improve fuel efficiency.

  Specifically, the control device preferably executes the following control.

  That is, the control device sets a target operating point for improving the engine operating efficiency based on the operating state of the engine, and sends the oil to the first high-pressure accumulator at the time of engine output regeneration, thereby reducing the engine operating efficiency at the target operating point. It is determined whether the engine is in the first regeneration state that is achieved, or whether the engine is in the second regeneration state where the engine operating efficiency at the target operating point is not achieved even if oil is sent to the first high pressure accumulator.

  When the control device is in the first regeneration state, the control device performs the regeneration operation in the first mode as the first state by the first switching mechanism. Further, when the control device is in the second regeneration state, the control device sets the second state by the first switching mechanism, and when the pressure of the second high pressure accumulator is less than a predetermined set pressure, The regenerative operation performed in the second mode as the fourth state and the regenerative operation performed in the third mode as the third state by the second switching mechanism when the pressure of the second high pressure accumulator is equal to or higher than a predetermined set pressure. repeat. Here, the “predetermined set pressure” may be a single value or a certain range.

  When there is only one high-pressure accumulator as in the conventional regenerative system, if there is not much oil stored in the high-pressure accumulator and the pressure is in a relatively low regenerative state, the regenerative operation by the engine output is performed. When performing, the engine load required for the oil pump motor functioning as an oil pump to send oil to the high pressure accumulator is small, and the engine output torque consumed by the oil pump motor is relatively small. For this reason, the engine output torque necessary for increasing the engine operating efficiency cannot be obtained, and the engine operating efficiency may be reduced.

  On the other hand, according to the above configuration, when the engine operation efficiency at the target operating point cannot be achieved by the regenerative operation in the first mode, the second high pressure accumulator is maintained in the constant high pressure range while maintaining the pressure of the second high pressure accumulator. Since the regenerative operation in the mode and the regenerative operation in the third mode are repeated, the load required for the oil pump motor to send oil to the first high pressure accumulator as necessary, and the engine output responsible for that load While increasing the torque, oil can be sent to the first high pressure accumulator to accumulate pressure. Thereby, engine operation efficiency can be improved and fuel consumption can be improved. Further, since the pressure of the oil discharged from the oil pump motor is increased as the engine output torque consumed to drive the oil pump motor increases, it is possible to improve the regeneration efficiency of the surplus torque.

The vehicle regeneration system according to the technology of the present disclosure includes a first high pressure accumulator having a relatively large oil storage capacity and a second high pressure accumulator having a relatively small oil storage capacity as the high pressure accumulator. Is provided. The oil pump motor, Ru comprises a first oil pump motor connected to the output shaft of the transmission, and a second oil pump motor connected to the output shaft of the engine. The first high pressure accumulator and the low pressure reservoir are connected via a first oil pump motor. The second high pressure accumulator and the low pressure reservoir are connected via a second oil pump motor. Then, the control device, to run the following control.

That is, the control device is in the first regeneration state in which the deceleration regeneration that regenerates the braking torque during the deceleration traveling is performed, or the engine output regeneration that regenerates the surplus torque of the engine during the steady traveling or the acceleration traveling. Judge whether it is in a regenerative state. In this case, when in the first regenerative state, the first oil pump motor Ri send the oil to the first high-pressure accumulator to function as an oil pump, a regenerative operation in the first mode using the first high-pressure accumulator Do. On the other hand, when in the second regenerative state, the second oil pump motor Ri send the oil to the second high-pressure accumulator to function as an oil pump, performs the regenerative operation in the second mode using the second high-pressure accumulator .

  According to this configuration, since the regenerative operation in the first mode is performed in the deceleration regeneration and the regenerative operation in the second mode is performed in the engine output regeneration, the oil storage capacity is relatively large during the deceleration regeneration. While ensuring the amount of energy that can be regenerated by the regenerative operation with the first high pressure accumulator, the regenerative operation and power running can be performed in a relatively short time using the second high pressure accumulator with a relatively small oil storage capacity during engine output regeneration. It is possible to efficiently perform fine regeneration and power running execution control such as repeated operations. Thereby, the amount of energy that can be regenerated while the vehicle is running can be earned to improve fuel efficiency.

  The second oil pump motor is preferably integrated with the engine.

  As an example of such a second pump motor, the engine has a regenerative cylinder fitted with a piston that can reciprocate in conjunction with the rotational operation of the output shaft of the engine, and the regenerative cylinder and the piston are: The structure which forms the oil chamber connected to a low pressure reservoir and a 2nd high pressure accumulator is mentioned. In this configuration, the second pump motor is configured integrally with the engine including the regenerative cylinder and the piston.

  As a simple configuration including the second oil pump motor, a configuration in which a second oil pump motor is provided separately from the engine, and a power transmission mechanism for transmitting power between the second oil pump motor and the engine is provided. Can be considered. However, in such a configuration, the regenerative system becomes larger as a whole, and compactness is prevented. Further, since power is transferred between the engine and the oil pump motor via the power transmission mechanism, mechanical loss is relatively large, and the regenerative efficiency of surplus torque is impaired by that amount.

  On the other hand, according to the above configuration, since the second oil pump motor is configured integrally with the engine, the regenerative system can be made more compact than when the second oil pump motor is provided separately from the engine. Can be planned. Further, the engine functions as an oil pump when the piston in the regenerative cylinder reciprocates in conjunction with the rotation operation of the output shaft of the engine. Excess torque of the engine is directly converted into hydraulic energy by such reciprocation of the piston. Also, the engine functions as a hydraulic motor by the oil discharged from the second high pressure accumulator being distributed to the oil chamber of the regenerative cylinder and the oil discharge pressure acting on the engine output shaft via the piston. To do. The hydraulic energy of the oil discharged from the second high pressure accumulator is directly converted into output torque by such reciprocation of the piston. From the above, mechanical loss in power transmission during engine output regeneration and power running can be suppressed, and the regeneration efficiency of surplus torque can be improved.

  The regenerative system in which the second oil pump motor exemplified above is integrated with the engine has the following configuration, for example.

  That is, the engine has a first regeneration cylinder and a second regeneration cylinder as the regeneration cylinder. Also, the regenerative system has a first state in which oil can flow between the oil chamber of the first regenerative cylinder and the low pressure reservoir, and oil cannot flow between the oil chamber of the first regenerative cylinder and the low pressure reservoir. A first switching mechanism that switches between the second state, a third state in which oil can flow between the oil chamber of the first regeneration cylinder and the second high pressure accumulator, and an oil chamber of the first regeneration cylinder; And a second switching mechanism that switches between a fourth state in which oil cannot flow with the second high-pressure accumulator.

  The regeneration system further includes a fifth state in which oil can flow between the oil chamber of the second regeneration cylinder and the low pressure reservoir, and oil cannot flow between the oil chamber of the second regeneration cylinder and the low pressure reservoir. A third switching mechanism for switching between the sixth state, a seventh state in which oil can flow between the oil chamber of the second regeneration cylinder and the second high pressure accumulator, an oil chamber of the second regeneration cylinder, and a second state Oil can flow between the fourth switching mechanism that switches between the eighth state where oil cannot flow between the two high pressure accumulators and the oil chamber of the first regeneration cylinder and the oil chamber of the second regeneration cylinder. A fifth switching mechanism for switching between the ninth state and the tenth state in which oil cannot flow between the oil chamber of the first regeneration cylinder and the oil chamber of the second regeneration cylinder.

  In this case, it is preferable that the reciprocating operation between the piston of the first regeneration cylinder and the piston of the second regeneration cylinder is an opposite operation whose phases are shifted by 180 degrees, and the following control is executed by the control device. .

  That is, the control device sends all the oil discharged from the oil chambers of the first regeneration cylinder and the second regeneration cylinder to the second high pressure accumulator during the regeneration operation in the second mode or the third mode. By controlling the first to fifth switching mechanisms, at least one of the first regenerative operation for regenerating all the hydraulic energy of the oil sent by the second oil pump motor, and the first regenerative cylinder and the second regenerative cylinder By controlling the first to fifth switching mechanisms so that part of the oil discharged from the oil chamber of the regenerative cylinder flows into the oil chamber of the other regenerative cylinder via the circulation passage, the second A second regenerative operation for partially regenerating the hydraulic energy of the oil sent by the oil pump motor is performed.

  According to this configuration, the first regenerative operation for regenerating all the hydraulic energy of the oil sent by the second oil pump motor, and the second regenerative operation for partially regenerating the hydraulic energy of the oil sent by the second oil pump motor. , The load required for the second oil pump motor to send oil to the second high pressure accumulator, and hence the engine output torque that bears the load, can be adjusted, and the engine operating efficiency can be improved.

  Further, the control device causes the first to fifth so as to send all the oil discharged from the oil chambers of the first regeneration cylinder and the second regeneration cylinder to the low pressure reservoir during the power running operation using the second high pressure accumulator. By controlling the switching mechanism, the first power running operation that uses all the hydraulic energy of the oil discharged from the second high pressure accumulator for power running, and the regeneration of at least one of the first regeneration cylinder and the second regeneration cylinder. The second high pressure accumulator by controlling the first to fifth switching mechanisms so that a part of the oil discharged from the oil chamber of the regenerative cylinder flows into the oil chamber of the other regenerative cylinder via the circulation passage. A second power running operation that partially uses hydraulic energy of oil discharged from the container for power running.

  According to this configuration, the first power running operation that uses all the hydraulic energy of the oil discharged from the second high pressure accumulator for power running, and the hydraulic energy of the oil that is discharged from the second high pressure accumulator is partially used for power running. By switching between the second power running operation to be performed, the driving force of the engine obtained by the power running can be adjusted, and the start and the acceleration running suitable for the driving request can be realized.

  According to the regenerative system for a vehicle, it is possible to increase engine operation efficiency and earn an amount of energy that can be regenerated while the vehicle is running, thereby improving fuel efficiency.

It is a conceptual diagram which shows the structure of the regeneration system of the motor vehicle which concerns on Embodiment 1. FIG. It is a conceptual diagram which shows the state at the time of engine output regeneration of the regeneration system which concerns on Embodiment 1. FIG. It is a conceptual diagram which shows the state at the time of the deceleration regeneration of the regeneration system which concerns on Embodiment 1. FIG. It is a conceptual diagram which shows the state at the time of the power running of the regeneration system which concerns on Embodiment 1. FIG. 3 is a functional block diagram of a control device according to Embodiment 1. FIG. It is an image figure of an engine operation efficiency map. It is a flowchart figure which shows an example of control of the regeneration system of the motor vehicle concerning Embodiment 1. It is a conceptual diagram which shows the structure of the regeneration system of the motor vehicle which concerns on Embodiment 2. FIG. It is a conceptual diagram which shows the structure of the engine which concerns on Embodiment 2. FIG. It is a conceptual diagram which shows the cross-sectional structure of the engine in the XX line of FIG. It is the 1st stroke figure at the time of all the output regeneration of the regeneration system concerning Embodiment 2. It is a conceptual diagram which shows the state of the engine in the XII-XII line | wire of FIG. It is the 2nd stroke figure at the time of all the output regeneration of the regeneration system concerning Embodiment 2. It is a conceptual diagram which shows the state of the engine in the XIV-XIV line | wire of FIG. It is the 3rd stroke figure at the time of all the output regeneration of the regeneration system concerning Embodiment 2. It is a conceptual diagram which shows the state of the engine in the XVI-XVI line | wire of FIG. It is the 4th stroke figure at the time of all the output regeneration of the regeneration system concerning Embodiment 2. It is a conceptual diagram which shows the state of the engine in the XVIII-XVIII line of FIG. It is the 5th stroke figure at the time of the partial output regeneration of the regeneration system concerning Embodiment 2. It is a 6th stroke figure at the time of partial output regeneration of the regeneration system concerning Embodiment 2. It is a 1st stroke figure at the time of full load power running of the regeneration system concerning Embodiment 2. It is a conceptual diagram which shows the state of the engine in the XXII-XXII line | wire of FIG. It is a 2nd stroke figure at the time of full load power running of the regeneration system concerning Embodiment 2. It is a conceptual diagram which shows the state of the engine in the XXIV-XXIV line | wire of FIG. It is a 3rd stroke figure at the time of partial load power running of the regeneration system concerning Embodiment 2. It is a 4th stroke figure at the time of partial load power running of the regeneration system concerning Embodiment 2. It is a conceptual diagram which shows the structure of the regeneration system which concerns on other embodiment.

  Hereinafter, exemplary embodiments will be described in detail with reference to the drawings.

Embodiment 1
In the first embodiment, as the high pressure accumulator, a first high pressure accumulator and a second high pressure accumulator having different oil storage capacities are provided, and only the first high pressure accumulator is based on the level of engine operation efficiency depending on the regenerative state. A regenerative system that selectively uses the first mode that uses the second mode, the second mode that uses only the second high-pressure accumulator, and the third mode that uses both the first high-pressure accumulator and the second high-pressure accumulator will be described.

−Regenerative system configuration−
FIG. 1 shows an example of an automobile C as a vehicle using the regeneration system 1 according to the first embodiment. As shown in FIG. 1, the regeneration system 1 includes an engine 3, a first clutch 5, a transmission 7, a differential gear 9, a drive wheel 11, a coupling mechanism 13, a second clutch 15, an oil pump motor 17, a low pressure reservoir 19, 1 high pressure accumulator 21, second high pressure accumulator 23, and control device 25 called VCM (Vehicle Control Module).

  The engine 3 is a reciprocating engine, for example. A throttle 29 is installed in the intake passage 27 of the engine 3. A catalyst device 33 and a muffler 35 are installed in the exhaust passage 31 of the engine 3 in order from the upstream side. The output shaft 4 of the engine 3 is connected to the drive wheels 11 via the first clutch 5, the transmission 7 and the differential gear 9. FIG. 1 shows a state where the vehicle is running with the engine 3 as a power source, and the drive wheels 11 are rotationally driven by the engine 3.

  The oil pump motor 17 is a device having both functions of an oil pump and a hydraulic motor. The first oil inlet / outlet port 17a and the second oil port function as either an oil discharge port or a suction port during regeneration and power running. It has an entrance / exit 17b. As shown in FIG. 1, the rotation shaft of the oil pump motor 17 is connected to the output shaft to the drive wheels 11 via the second clutch 15, the connection mechanism 13, the transmission 7, and the differential gear 9, and the second clutch 15, it is also connected to the output shaft 4 of the engine 3 via the connecting mechanism 13 and the first clutch 5. In FIG. 1, the second clutch 15 is in a disengaged state.

  When the oil pump motor 17 functions as an oil pump, the first oil port 17a functions as a suction port, and the second oil port 17b functions as a discharge port (see FIG. 2). When the oil pump motor 17 functions as a hydraulic motor, the first oil inlet / outlet port 17a functions as a discharge port, and the second oil inlet / outlet port 17b functions as a suction port (see FIG. 3).

  The low pressure reservoir 19 includes a pressure resistant reservoir container 37 and a piston 39 slidably disposed inside the reservoir container 37. The interior of the reservoir container 37 is partitioned into an oil chamber 41 and a gas chamber 43 by a piston 39 in the sliding direction. In the gas chamber 43, for example, low-pressure air having a level of 10 to 30 atm is stored. The oil chamber 41 stores oil pressurized at the same atmospheric pressure level as the air in the gas chamber 43.

  The first high pressure accumulator 21 includes a pressure accumulating container 45 having pressure resistance and a piston 47 slidably disposed inside the pressure accumulating container 45. The inside of the pressure accumulating vessel 45 is partitioned into an oil chamber 49 and a gas chamber 51 in a sliding direction by a piston 47. In the gas chamber 51, for example, high-pressure air having a level of 200 to 400 atmospheres is stored. The oil chamber 49 stores oil pressurized at the same atmospheric pressure level as the air in the gas chamber 51.

  The basic configuration of the second high pressure accumulator 23 is the same as that of the first high pressure accumulator 21. That is, the second high-pressure accumulator 23 includes a pressure-resistant container 53 having pressure resistance and a piston 55 slidably disposed inside the pressure-resistant container 53, and the inside of the heat-resistant container 53 is oil chamber 57 by the piston 55. And a gas chamber 59. In the gas chamber 59, for example, high-pressure air having a level of 200 to 400 atmospheres is stored. The oil chamber 57 stores oil pressurized at the same atmospheric pressure level as the air in the gas chamber 59.

  The oil storage capacity in the first high-pressure accumulator 21 is set to a capacity that is about the same as or slightly less than the oil storage capacity in the low-pressure reservoir 19. The oil storage capacity in the second high pressure accumulator 23 is smaller than the oil storage capacity in the first high pressure accumulator 21, for example, from 1/20 of the oil storage capacity in the first high pressure accumulator 21. The capacity is about one fifth.

  The oil chambers 49 and 57 of the first high-pressure accumulator 21 and the second high-pressure accumulator 23 and the oil chamber 41 of the low-pressure reservoir 19 are respectively connected to the oil pump motor 17 and are connected via the oil pump motor 17. Are connected to each other.

  The low-pressure reservoir 19 and the first high-pressure accumulator 21 are provided with oil outlets 19a and 21a for allowing oil to enter and leave the oil chambers 41 and 49, respectively. Further, the second high pressure accumulator 23 is provided with an oil inlet 23 a for introducing oil into the oil chamber 57 and an oil outlet 23 b for discharging oil from the oil chamber 57.

  The oil inlet / outlet port 19 a of the low pressure reservoir 19 is connected to the first oil inlet / outlet port 17 a of the oil pump motor 17 via the low pressure side oil passage 61. The oil inlet / outlet port 21 a of the first high pressure accumulator 21 is connected to the oil inlet port 23 a and the oil outlet port 23 b of the second high pressure accumulator 23 and the second oil inlet port 17 b of the oil pump motor 17 through the high pressure side oil passage 63. Connected.

  The high pressure side oil flow path 63 includes a first flow path 65 and a second flow path 67. The first flow path 65 is a flow path that bypasses the second high-pressure accumulator 23, and directly connects the oil inlet / outlet port 21 a of the first high-pressure accumulator 21 and the second oil inlet / outlet port 17 b of the oil pump motor 17. Yes. On the other hand, the second flow path 67 is a flow path that passes through the second high pressure accumulator 23, and connects the oil inlet / outlet port 21a of the first high pressure accumulator 21 and the second oil inlet / outlet port 17b of the oil pump motor 17 to the second high pressure line. The pressure accumulator 23 is connected via an oil chamber 57.

  The second flow path 67 includes a first partial flow path 73 that connects the second oil inlet / outlet port 17b of the oil pump motor 17 and the oil inlet port 23a of the second high pressure accumulator 23, and an oil outlet port 23b of the second high pressure accumulator 23. And a second partial flow path 75 that connects the oil inlet / outlet port 21a of the first high-pressure accumulator 21. The first partial flow path 73 and the second partial flow path 75 are configured to share a part with the first flow path 65. That is, the high-pressure side oil passage 63 is branched into the first passage 65 and the first partial passage 73 on the oil pump motor 17 side, and the first passage 65 and the second portion on the first high-pressure accumulator 21 side. It is branched into a flow path 75.

  A first switching valve 77 is provided at a branch portion between the first flow path 65 and the first partial flow path 73 in the high-pressure side oil flow path 63. The first switching valve 77 includes a first communication state in which a portion on the oil pump motor 17 side and a portion on the first high pressure accumulator 21 side with respect to the first switching valve 77 in the first flow path 65 communicate with each other. The second communication state in which the portion closer to the oil pump motor 17 than the first switching valve 77 and the portion closer to the second high pressure accumulator 23 than the first switching valve 77 and the high pressure side oil passage 63 are blocked. Switch between blocking states.

  A second switching valve 79 is provided at a branch portion between the first flow path 65 and the second partial flow path 75 in the high-pressure side oil flow path 63. The second switching valve 79 has a first communication state in which a portion of the first flow path 65 closer to the oil pump motor 17 than the second switching valve 79 and a portion closer to the first high-pressure accumulator 21 are in communication with each other. A second communication state in which the portion on the second high-pressure accumulator 23 side and the portion on the first high-pressure accumulator 21 side with respect to the second switching valve 79 in the two-part flow passage 75 are communicated, and the high-pressure side oil passage 63. Switch between blocking state and blocking state.

  In addition, open / close valves 81 and 83 are provided at the oil outlets 19 a and 21 a of the low pressure reservoir 19 and the first high pressure accumulator 21, respectively. The open / close valve 81 of the low pressure reservoir 19 allows the oil chamber 41 and the low pressure side oil passage 61 to communicate with each other when in the open state. Further, the open / close valve 83 of the first high pressure accumulator 21 allows the oil chamber 49 and the high pressure side oil flow path 63 to communicate with each other when in the open state. These on-off valves 81 and 83 are normally closed.

  Here, the first switching valve 77, the second switching valve 79, and the on-off valve 83 of the first high pressure accumulator 21 are connected between the oil pump motor 17 and the oil chamber 49 of the first high pressure accumulator 21. A first state is switched between a first state in which oil can flow through the first flow path 65 and a second state in which oil can flow through the first partial flow path 73 between the oil pump motor 17 and the second high-pressure accumulator 23. A switching mechanism is configured.

  The second switching valve 79 and the opening / closing valve 83 of the first high pressure accumulator 21 are a second portion between the oil chamber 49 of the first high pressure accumulator 21 and the oil chamber 57 of the second high pressure accumulator 23. A second switching mechanism is configured to switch between a third state in which oil can flow through the flow path 75 and a fourth state in which oil cannot flow between the oil chambers 49 and 57.

  The oil stored in the oil chambers 41, 49, 57 of the low pressure reservoir 19, the first high pressure accumulator 21 and the second high pressure accumulator 23 is the flow path set by the first switching valve 77 and the second switching valve 79. Accordingly, the oil pump motor 17 is driven to move between the three. Therefore, the amount of oil stored in each of the oil chambers 41, 49, and 57 changes according to the operation of the oil pump motor 17. The volumes of the gas chambers 43, 51, 59 of the low pressure reservoir 19, the first high pressure accumulator 21, and the second high pressure accumulator 23 vary according to the amount of oil stored in the corresponding oil chambers 41, 49, 57. To do.

  That is, in the low pressure reservoir 19, the first high pressure accumulator 21 and the second high pressure accumulator 23, when oil flows into the oil chambers 41, 49, 57, the pistons 39, 47, 55 are moved to the gas chamber 43 along with the inflow. , 51, 59, and the volume of the oil chambers 41, 49, 57 is increased by the sliding, and the volume of the gas chambers 43, 51, 59 is decreased accordingly. Further, when the oil flows out from the oil chambers 41, 49, 57, the pistons 39, 47, 55 slide to the oil chambers 41, 49, 57 side with the outflow, and the sliding of the oil chambers 41, 49, 57 occurs. The volume is reduced, and the volumes of the gas chambers 43, 51, 59 are increased accordingly.

  The control device 25 includes hardware such as a CPU (Central Processing Unit) and a memory, and software such as a control program, and has a function of comprehensively controlling the regenerative operation and power running operation of the automobile C. Yes. For example, drive control of the engine 3 and the oil pump motor 17, connection control of the first clutch 5 and the second clutch 15, open / close control of the open / close valves 81 and 83 of the low pressure reservoir 19 and the first high pressure accumulator 21, and the first switching valve The switching control of the 77 and the second switching valve 79 is performed by the control device 25.

  The car C is provided with various sensors for controlling the regeneration system 1.

  Specifically, the first high pressure accumulator 21 is provided with a first pressure sensor 85 that detects the internal pressure of the gas chamber 51. The second high pressure accumulator 23 is provided with a second pressure sensor 87 that detects the internal pressure of the gas chamber 59. The oil pump motor 17 is provided with a PM discharge amount sensor 89 that detects the flow rate of oil discharged to the high-pressure side oil passage 63 and a PM rotation speed sensor 91 that detects the rotation speed of the oil pump motor 17. . The engine 3 is provided with an engine speed sensor 93 that detects the engine speed. In addition, the automobile C is provided with an accelerator sensor 95, a brake sensor 97, and a vehicle speed sensor 99. The accelerator sensor 95 detects the operation amount (depression amount) of the accelerator pedal. The brake sensor 97 detects the operation amount (depression amount) of the brake pedal.

  While the automobile C is in operation, the detection values of these sensors are output to the control device 25. The control device 25 controls the regenerative system 1 based on these detection values.

-Control of regenerative system-
Next, the operation and control of the regeneration system 1 will be described.

  The regeneration system 1 performs a regeneration operation and a power running operation as basic operations. The regeneration system 1 of the present embodiment performs engine output regeneration and deceleration regeneration as regeneration operations. The regenerative operation and power running operation will be described below with reference to FIGS. FIG. 2 is a conceptual diagram showing a state of the automobile C during regeneration of the engine output. FIG. 3 is a conceptual diagram showing a state of the automobile C during deceleration regeneration. FIG. 4 is a conceptual diagram showing a state of the vehicle C during powering. Here, a case where only the first high-pressure accumulator 21 is used will be described as an example. Therefore, in any of the operations described below, both the first switching valve 77 and the second switching valve 79 are in the first communication state.

<Engine output regeneration>
The control device 25 attempts to drive the engine 3 at an operating point (a target operating point described later) with good engine operating efficiency in response to a driver's driving request (such as an accelerator pedal depression operation) during steady driving or acceleration driving. In some cases, if surplus torque still occurs even when the travel state corresponding to the travel request is realized, engine output regeneration is performed to regenerate the surplus torque. In the engine output regeneration, as shown in FIG. 2, the on-off valves 81 and 83 of the low pressure reservoir 19 and the first high pressure accumulator 21 are opened, and both the first clutch 5 and the second clutch 15 are connected, and the engine 3 A part of the power, that is, surplus torque is input to the oil pump motor 17. Accordingly, the oil pump motor 17 is driven as an oil pump, and the oil in the low pressure reservoir 19 is sent to the first high pressure accumulator 21. As a result, the internal pressure of the first high pressure accumulator 21 rises, and the oil pressurized to a high pressure is accumulated in the first high pressure accumulator 21.

<Deceleration regeneration>
For example, when the accelerator pedal is not depressed or the brake pedal is depressed while the vehicle C is traveling, the control device 25 performs deceleration regeneration that regenerates the braking torque. In the deceleration regeneration, as shown in FIG. 3, the on-off valves 81 and 83 of the low pressure reservoir 19 and the first high pressure accumulator 21 are opened, the first clutch 5 is disengaged and the second clutch 15 is engaged, and the drive wheels 11, that is, braking torque is input to the oil pump motor 17. Accordingly, the oil pump motor 17 is driven as an oil pump, and the oil in the low pressure reservoir 19 is sent to the first high pressure accumulator 21. As a result, the internal pressure of the first high pressure accumulator 21 rises, and the oil pressurized to a high pressure is accumulated in the first high pressure accumulator 21.

<Powering>
The control device 25 executes power running for performing hydraulic traveling when the vehicle C starts, decelerates or accelerates from steady traveling, and further when traveling uphill. In power running, as shown in FIG. 4, the on-off valves 81 and 83 of the low pressure reservoir 19 and the first high pressure accumulator 21 are opened, the first clutch 5 is disengaged and the second clutch 15 is connected, and the first high pressure The oil in the pressure accumulator 21 flows out toward the low pressure reservoir 19. The oil pump motor 17 is driven as a hydraulic motor by the discharge pressure of oil from the first high pressure accumulator 21, and the power is output to the drive wheels 11. As a result, the automobile C is hydraulically driven. The oil that has flowed out of the first high pressure accumulator 21 is collected in the low pressure reservoir 19.

<Functional configuration of control device>
FIG. 5 shows a functional block diagram of the control device 25. As shown in FIG. 5, the control device 25 functionally includes a target operating point setting unit 101, a target PM consumption torque calculation unit 103, a predicted PM consumption torque calculation unit 105, and a storage unit 107 including a memory. Is provided.

  The target operating point setting unit 101 sets a target operating point P2 (combination of engine speed and engine output torque) that improves engine operating efficiency based on the operating state of the engine 3 during engine output regeneration. The target operating point P2 realizes an operating point (hereinafter referred to as “requested operating point”) P1 corresponding to a travel request based on detection values of the accelerator sensor 95 and the vehicle speed sensor 99, that is, a driving state required by the driver. Is set based on the engine speed (hereinafter referred to as “required engine speed”) N1 and the engine output torque (hereinafter referred to as “required engine output torque”) T1 required for the operation.

  Specifically, the target operating point P2 is set using an engine operating efficiency map. The engine operation efficiency map is stored in the storage unit 107 in advance. In this engine operation efficiency map, engine operation efficiency according to the engine speed and engine output torque is defined. FIG. 6 shows an image diagram of the engine operation efficiency map. A plurality of solid lines L shown in FIG. 6 are iso-efficiency lines and indicate operating points having the same engine operating efficiency. The target operating point setting unit 101 compares the required engine speed N1 and the required engine output torque T1 with the engine operating efficiency map, and the engine operating efficiency is higher than the required operating point at the same engine speed N2 as the required engine speed N1. The operating point at the engine output torque (hereinafter referred to as “target engine output torque”) T2 is set as the target operating point P2.

  The engine operating efficiency map is unique to each engine 3 and is obtained in advance by actual measurement or the like. Therefore, the engine operation efficiency map shown in FIG. 6 is merely an example, and may have different characteristics depending on the engine 3.

  The target PM consumption torque calculation unit 103 is an engine load required to drive the oil pump motor 17 necessary for operating the engine 3 at the target operating point P2, that is, an engine output torque TAR (consumption required by the oil pump motor 17). Hereinafter, “target PM consumption torque TAR” is calculated. This target PM consumption torque TAR is calculated by subtracting the required engine output torque T1 from the target engine output torque T2 (TAR = T2-T1).

  The predicted PM consumption torque calculation unit 105 calculates an engine output torque (hereinafter referred to as “predicted PM consumption torque”) TPM consumed by the oil pump motor 17 when engine output regeneration is performed via the first flow path 65. To do. This predicted PM consumption torque TPM is calculated based on the oil discharge flow rate (hereinafter referred to as “predicted oil discharge flow rate”) discharged by the oil pump motor 17 when engine output regeneration is performed at the target engine speed N2. The The predicted oil discharge flow rate is calculated based on the detection value of the first pressure sensor 85.

  The control device 25 sets the first flow path through which oil can flow in the high-pressure side oil flow path 63 according to the regenerative state determined based on the target PM consumption torque TAR and the predicted PM consumption torque TPM described above during the regenerative operation. The first mode using only the first high-pressure accumulator 21, the second mode using only the second high-pressure accumulator 23, the first high-pressure accumulator 21 and the second mode are switched between the channel 65 and the second channel 67. The third mode using both of the high pressure accumulators 23 is selectively used.

  The regenerative control by the control device 25 will be described below with an example with reference to FIG. FIG. 7 is a flowchart showing an example of control of the regeneration system 1 according to the present embodiment.

  In the regenerative control, as shown in FIG. 7, first, in step ST001, the control device 25 determines whether or not a regenerative command has been issued. The regenerative command is used when surplus torque is generated when the operation state of the engine 3 corresponding to the travel request is realized at the target operating point P2 when oil can be added to the oil chamber 49 of the first high pressure accumulator 21. This is issued when the accelerator pedal is not depressed or the brake pedal is depressed.

  This regeneration command includes information on whether the command is for engine output regeneration or the command for deceleration regeneration. If the regeneration command is not issued in step ST001, step ST001 is performed again. That is, step ST001 is repeatedly performed until a regeneration command is issued. If the regeneration command has been issued, the process proceeds to step ST002.

  In step ST002, control device 25 determines whether or not the regenerative operation executed by the regenerative command is engine output regeneration. This determination is made based on whether or not the regeneration command is a command for engine output regeneration. At this time, if the regeneration command is a command for engine output regeneration, it is determined that the regenerative operation to be performed is engine output regeneration, and the process proceeds to step ST003. If the regeneration command is not a command for engine output regeneration, that is, a command for deceleration regeneration, it is determined that the regeneration operation to be performed is deceleration regeneration, and the process proceeds to step ST010.

  In Step ST003, the control device 25 performs the engine operation efficiency at the target operating point P2 set by the target operating point setting unit 101 when the engine output regeneration is performed via the first flow path 65 (hereinafter referred to as “high engine operation”). It is determined whether the engine is in a first regenerative state where the efficiency is achieved) or in a second regenerative state where high engine operating efficiency is not achieved. Whether or not high engine operating efficiency is achieved is determined by whether or not the predicted PM consumption torque TPM exceeds the target PM consumption torque TAR.

  Specifically, when the predicted PM consumption torque TPM is equal to or greater than the target PM consumption torque TAR, the engine output torque T2 necessary for realizing the operation of the engine 3 at the target operating point P2 can be obtained. It is determined that the engine is in the first regeneration state in which high engine operation efficiency is achieved. In this case, the process proceeds to step ST004. In addition, when the predicted PM consumption torque TPM is smaller than the target PM consumption torque TAR, the engine output torque T2 required to realize the operation of the engine 3 at the target operating point P2 cannot be obtained. It determines with it being in the 2nd regeneration state in which efficiency is not achieved. In this case, the process proceeds to step ST005.

  In step ST004, the control device 25 switches the high-pressure side oil passage 63 to the first passage 65 by setting both the first switching valve 77 and the second switching valve 79 to the first communication state. Thus, the oil pump motor 17 and the oil chamber 49 of the first high-pressure accumulator 21 are in direct communication with each other via the first flow path 65 so that oil can flow between them (first state). ). In this state, the pressure of the oil stored in the oil chamber 49 of the first high-pressure accumulator 21 is applied as a load to the oil pump motor 17, and the oil sent by the oil pump motor 17 in the regenerative operation against the pressure. It flows into the oil chamber 49 of the first high pressure accumulator 21. Thus, the regeneration operation in the first mode is performed. When step ST004 is completed, the process proceeds to step ST009.

  In step ST005, the control apparatus 25 switches the high pressure side oil flow path 63 to the 2nd flow path 67 by making the 1st switching valve 77 into a 2nd connection state. As a result, the oil pump motor 17 and the oil chamber 57 of the second high-pressure accumulator 23 are communicated with each other via the first partial flow path 73 so that oil can flow between them (second state). It is said. In this state, the pressure of the oil stored in the oil chamber 57 of the second high pressure accumulator 23 is applied as a load to the oil pump motor 17, and the oil pump motor 17 (functions as an oil pump) is regenerated against the pressure. ) Is sent to the oil chamber 57 of the second high-pressure accumulator 23.

  Subsequent steps ST006, ST007, and ST008 are performed by maintaining the oil stored in the oil chamber 57 of the second high pressure accumulator 23 while maintaining the pressure of the gas chamber 59 of the second high pressure accumulator 23 in a predetermined high pressure region. This is a step for moving to the oil chamber 51 of the first high-pressure accumulator 21.

  In step ST006, the control device 25 determines whether or not the pressure in the gas chamber 59 of the second high pressure accumulator 23, that is, the detected value of the second pressure sensor 87 is equal to or higher than a predetermined set pressure. For example, one value is set as the predetermined set pressure. In this step ST006, when the detected value of the second pressure sensor 87 is less than the predetermined set pressure, it is determined that the pressure in the gas chamber 59 of the second high pressure accumulator 23 needs to be increased, and the process proceeds to step ST007. On the other hand, if the detected value of the second pressure sensor 87 is equal to or higher than the predetermined set pressure, it is determined that the pressure in the gas chamber 59 of the second high pressure accumulator 23 needs to be lowered, and the process proceeds to step ST008.

  In step ST007, the control device 25 puts the second switching valve 79 into a shut-off state while keeping the first switching valve 77 in the second communication state. As a result, the oil cannot flow through the oil chamber 49 of the first high pressure accumulator 21 and the oil chamber 57 of the second high pressure accumulator 23, that is, in the second partial flow path 75 (fourth state). The oil sent by the oil pump motor 17 in the regenerative operation flows into the oil chamber 57 of the second high-pressure accumulator 23 but is stored without being discharged. Thus, the regeneration operation in the second mode is performed. When oil flows into the oil chamber 57 of the second high pressure accumulator 23 by the regenerative operation in the second mode, the pressure in the gas chamber 59 of the second high pressure accumulator 23 is increased accordingly. When step ST007 is completed, the process proceeds to step ST009.

  In step ST008, the control device 25 sets the first switching valve 77 to the shut-off state and sets the second switching valve 79 to the second communication state. As a result, the oil can flow between the oil chamber 49 of the first high-pressure accumulator 21 and the oil chamber 57 of the second high-pressure accumulator 23 (third state). The oil stored in the oil chamber 57 is sent into the oil chamber 49 of the first high-pressure accumulator 21 through the second partial flow path 75. Thus, the regeneration operation in the third mode is performed. When oil flows out from the oil chamber 57 of the second high-pressure accumulator 23 by the regenerative operation in the third mode, the pressure in the gas chamber 59 of the second high-pressure accumulator 23 decreases by that amount. When step ST008 ends, the process proceeds to step ST009.

  In step ST010, when performing deceleration regeneration via the first flow path 65, the control device 25 can obtain the braking force according to the detected value of the brake sensor 97, that is, to obtain the required braking force. It is determined whether or not the required operation efficiency of the oil pump motor 17 (hereinafter referred to as “high PM operation efficiency”) is achieved, or whether the second regeneration state where high PM operation efficiency is not achieved. To do. Whether or not the high PM operation efficiency is achieved is determined based on detection values of the first pressure sensor 85, the engine speed sensor 93, the vehicle speed sensor 99, and the like.

  At this time, when the high PM operation efficiency is not achieved, the process proceeds to step ST005, and the subsequent steps described above are performed. When high PM operation efficiency is achieved, the process proceeds to step ST011, and the high-pressure side oil flow path 63 is switched to the first flow path 65 as in step ST004. As a result, the pressure of the oil stored in the oil chamber 49 of the first high-pressure accumulator 21 is applied as a load to the oil pump motor 17, and the oil sent by the oil pump motor 17 in the regenerative operation against the pressure is the first. 1 flows into the oil chamber 49 of the high pressure accumulator 21. When step ST011 is completed, the process proceeds to step ST009.

  In step ST009, the control device 25 determines whether or not the regeneration command is continued. At this time, if it is determined that the regeneration command is continuing, the process returns to step ST002 and the subsequent steps are repeated. If it is determined that the regeneration command is not continued, the process returns.

  According to the above regeneration control, in the case of the first regeneration state in which high engine operation efficiency is achieved in engine output regeneration and in the case of the first regeneration state in which high PM operation efficiency is achieved in deceleration output regeneration. The regenerative operation is performed in the first mode. Further, when the engine is in the second regeneration state where high engine operation efficiency is not achieved in the engine output regeneration and in the second regeneration state where high PM operation efficiency is not achieved in the deceleration output regeneration, the regeneration operation performed in the second mode. And the regenerative operation performed in the third mode are repeated.

-Effect of Embodiment 1-
According to the regenerative system 1 according to the first embodiment, when the engine operation efficiency at the target operating point P2 cannot be achieved by the regenerative operation in the first mode, the pressure of the second high pressure accumulator 23 is maintained in a constant high pressure range. However, since the regenerative operation in the second mode and the regenerative operation in the third mode are repeated, the load required for the oil pump motor 17 to send oil to the first high pressure accumulator 21 as required, and thus The engine output torque that bears the load can be increased. Thereby, engine operation efficiency can be improved and fuel consumption can be improved. Further, as the engine output torque consumed to drive the oil pump motor 17 increases, the pressure of the oil discharged from the oil pump motor 17 is also increased, so that the regeneration efficiency of surplus torque can be improved. .

<< Embodiment 2 of the Invention >>
In the second embodiment, as the high pressure accumulator, the first high pressure accumulator and the second high pressure accumulator having different oil storage capacities are provided, and only the first high pressure accumulator is used for deceleration regeneration and engine output regeneration. The regenerative system 1 that selectively uses the mode and the second mode that uses only the second high-pressure accumulator will be described.

−Regenerative system configuration−
In FIG. 8, the conceptual diagram of a structure of the regeneration system 1 which concerns on this Embodiment 2 is shown. In addition, in this Embodiment 2, the same code | symbol is attached | subjected about the same structure location as the regeneration system 1 of the said Embodiment 1, and the detailed description is the description of the said Embodiment 1 based on FIGS. I will omit it and omit it.

  The regenerative system 1 includes an engine 3, a clutch 6, a transmission 7, a differential gear 9, a drive wheel 11, an oil pump motor 17 as a first oil pump motor, a low pressure reservoir 19, a first high pressure accumulator 21, and a second high pressure accumulator. 23, a control device 25, and the like.

  The output shaft 4 of the engine 3 is connected to the drive wheels 11 via a clutch 6, a transmission 7, an oil pump motor 17, and a differential gear 9. The engine 3 of the present embodiment also has the function of an oil pump motor and constitutes a second oil pump motor.

  The oil pump motor 17 is provided between the transmission 7 and the drive wheel 11. The rotation shaft of the oil pump motor 17 is connected to the drive wheels 11 via the differential gear 9. The oil pump motor 17 includes an oil circulation mechanism (not shown) that circulates oil inside when the regenerative operation (deceleration regeneration) is not performed.

  The oil inlet / outlet port 19 a of the low pressure reservoir 19 is connected to the first oil inlet / outlet port 17 a of the oil pump motor 17 via the low pressure side oil passage 61. The oil inlet / outlet port 19 a of the low pressure reservoir 19 is also connected to the engine 3 via the low pressure side oil passage 61. The oil inlet / outlet port 21 a of the first high pressure accumulator 21 is connected to the second oil inlet / outlet port 17 b of the oil pump motor 17 via the first high pressure side oil passage 109.

  The second high-pressure accumulator 23 is provided with an oil inlet / outlet 23 c for allowing oil to enter and exit from the oil chamber 59. The oil inlet / outlet port 23 c of the second high pressure accumulator 23 is connected to the engine 3 via the second high pressure side oil passage 111. That is, the oil chamber 41 of the low pressure reservoir 19 and the oil chamber 57 of the second high pressure accumulator 23 are connected via the engine 3. An open / close valve 24 is provided at the oil inlet / outlet port 23 c of the second high pressure accumulator 23.

  The oil storage capacity in the first high-pressure accumulator 21 is set to be slightly smaller than the oil storage capacity in the low-pressure reservoir 19. The oil storage capacity in the second high pressure accumulator 23 is smaller than the oil storage capacity in the first high pressure accumulator 21, for example, from one fifth of the oil storage capacity in the first high pressure accumulator 21. The capacity is about a half.

  FIG. 9 shows a conceptual diagram of the configuration of the engine 3, and FIG. 10 shows a conceptual diagram of a cross-sectional configuration of the engine 3 along the line XX of FIG. As shown in FIGS. 9 and 10, the engine 3 includes a first combustion cylinder 113a, a second combustion cylinder 113b, a first regeneration cylinder 115a, and a second regeneration cylinder 115b. The first combustion cylinder 113 a and the second combustion cylinder 113 b, and the first regeneration cylinder 115 a and the second regeneration cylinder 115 b are alternately arranged in the longitudinal direction of the output shaft 4 of the engine 3.

  Inside the first combustion cylinder 113a, the second combustion cylinder 113b, the first regeneration cylinder 115a, and the second regeneration cylinder 115b, a piston that can reciprocate in conjunction with the rotational operation of the output shaft 4 of the engine 3 117 is inserted in each. The first combustion cylinder 113a and the second combustion cylinder 113b and the piston 117 inside them form a combustion chamber 119 in which the air-fuel mixture is combusted. On the other hand, the first regeneration cylinder 115a and the second regeneration cylinder 115b, and the piston 117 inside them, form an oil chamber 121 for sucking and discharging oil.

  The reciprocating operation of the piston 117 of the first combustion cylinder 113a and the piston 117 of the second combustion cylinder 113b is the same operation, and moves up and down simultaneously in conjunction with the rotation of the output shaft 4 of the engine 3. . The first fuel cylinder 113a and the second combustion cylinder 113b are different in the phase of the combustion cycle including the intake stroke, the compression stroke, the combustion stroke, and the exhaust stroke by 180 degrees.

  The reciprocating operation of the piston 117 of the first regenerating cylinder 115a and the piston 117 of the second regenerating cylinder 115b is an opposite operation in which the phases of the reciprocating cycle are shifted by 180 degrees, and the output shaft 4 of the engine 3 When one piston 117 rises in conjunction with the rotation of the other piston 117, the other piston 117 descends. In the present embodiment, the piston 117 of the second regeneration cylinder 115b moves up and down simultaneously with both the pistons 117 of the first combustion cylinder 113a and the second combustion cylinder 113b.

  In the engine 3, an intake port 123 and an exhaust port 125 are formed for each of the first combustion cylinder 113a and the second combustion cylinder 113b, and openings on the combustion chamber 119 side of the intake port 123 and the exhaust port 125 are formed. An intake valve 127 and an exhaust valve 129 that open and close are provided. The intake valve 127 and the exhaust valve 129 are reciprocally driven so as to open and close the intake port 123 and the exhaust port 125 at predetermined timings in conjunction with the output shaft 4 of the engine 3.

  Further, the engine 3 is provided with a first oil port 131 and a second oil port 133 for each of the first regeneration cylinder 115a and the second regeneration cylinder 115b. Each first oil port 131 of the first regeneration cylinder 115 a and the second regeneration cylinder 115 b is connected to the low pressure side oil passage 61. Each second oil port 133 of the first regeneration cylinder 115 a and the second regeneration cylinder 115 b is connected to the second high pressure side oil flow path 111.

  The portion on the engine 3 side in the low-pressure side oil flow path 61 branches into a first branch path 61a and a second branch path 61b. The first branch path 61a is connected to an opening of the first oil port 131 of the first regeneration cylinder 115a facing the outside of the engine 3. The second branch path 61b is connected to an opening of the first oil port 131 of the second regeneration cylinder 115b that faces the outside of the engine 3.

  A first on-off valve 135 is provided on the first branch path 61a, and a second on-off valve 136 is provided on the second branch path 61b. The first on-off valve 135 is switched between an open state that allows oil to flow in the first branch path 61a and a closed state that disables oil flow in the first branch path 61a. The second on-off valve 136 is switched between an open state in which oil can flow through the second branch path 61b and a closed state in which oil cannot flow through the second branch path 61b.

  A portion of the second high-pressure side oil passage 111 on the engine 3 side branches into a first branch passage 111a and a second branch passage 111b. The first branch path 111a is connected to an opening of the second oil port 133 of the first regeneration cylinder 115a that faces the outside of the engine 3. The second branch path 111b is connected to the opening of the second oil port 133 of the second regeneration cylinder 115b facing the outside of the engine 3.

  A third on-off valve 137 is provided on the first branch path 111a, and a fourth on-off valve 138 is provided on the second branch path 111b. The third on-off valve 137 is switched between an open state that allows oil to flow through the first branch path 111a and a closed state that disables oil flow through the first branch path 111a. The fourth on-off valve 138 is switched between an open state that allows oil to flow through the second branch passage 111b and a closed state that disables oil flow through the second branch passage 111b.

  The engine 3 is further provided with a circulation channel 139 through which oil flows between the oil chamber 121 of the first regeneration cylinder 115a and the oil chamber 121 of the second regeneration cylinder 115b. The circulation channel 139 includes a first circulation channel 141 and a second circulation channel 143. The first circulation channel 141 and the second circulation channel 143 are configured to be partially shared.

  The first circulation channel 141 connects the first oil port 131 of the first regeneration cylinder 115a and the second oil port 133 of the second regeneration cylinder 115b. The second circulation channel 143 connects the second oil port 133 of the first regeneration cylinder 115a and the first oil port 131 of the second regeneration cylinder 115b.

  A first switching valve 145 is provided at a connection portion between the first oil port 131 and the first circulation passage 141 of the first regeneration cylinder 115a. The first switching valve 145 includes a first communication state in which the oil chamber 121 of the first regeneration cylinder 115a and the first branch passage 61a of the low-pressure side oil passage 61 are communicated with each other via the first oil port 131; The second communication state in which the oil chamber 121 of the first regeneration cylinder 115a and the first circulation channel 141 are communicated with each other through a part of the first oil port 131 is switched.

  A second switching valve 147 is provided at a connection portion between the second oil port 133 and the second circulation channel 143 of the first regeneration cylinder 115a. The second switching valve 147 has a first communication state in which the oil chamber 121 of the first regeneration cylinder 115a and the first branch passage 111a of the second high-pressure side oil passage 111 are communicated via the second oil port 133. The second communication state in which the oil chamber 121 of the first regeneration cylinder 115a and the second circulation channel 143 are communicated with each other via a part of the second oil port 133 is switched.

  A third switching valve 149 is provided at a connection portion between the first oil port 131 and the second circulation channel 143 of the second regeneration cylinder 115b. The third switching valve 149 has a first communication state in which the oil chamber 121 of the second regeneration cylinder 115b and the second branch passage 61b of the low-pressure side oil passage 61 communicate with each other via the first oil port 131, and The second communication state in which the oil chamber 121 of the second regeneration cylinder 115b and the second circulation channel 143 are communicated with each other via a part of the first oil port 131 is switched.

  A fourth switching valve 151 is provided at a connection portion between the second oil port 133 and the first circulation passage 141 of the second regeneration cylinder 115b. The fourth switching valve 151 has a first communication state in which the oil chamber 121 of the second regeneration cylinder 115b and the second branch passage 111b of the second high-pressure side oil passage 111 are communicated via the second oil port 133. Then, the second communication state in which the oil chamber 121 of the second regeneration cylinder 115b and the first circulation channel 141 are communicated with each other via a part of the second oil port 133 is switched.

  The first on-off valve 135 and the first switching valve 145 include a first state in which oil can flow between the oil chamber 121 of the first regeneration cylinder 115a and the low pressure reservoir 19, and an oil chamber of the first regeneration cylinder 115a. A first switching mechanism that switches between a second state in which oil cannot flow between 121 and the low-pressure reservoir 19 is configured.

  The third on-off valve 137 and the second switching valve 147 are in a third state in which oil can flow between the oil chamber 121 of the first regeneration cylinder 115a and the second high pressure accumulator 23, and the first regeneration cylinder 115a. The 2nd switching mechanism which switches between the oil chamber 121 and the 4th state in which oil cannot circulate between the 2nd high pressure accumulator 23 is comprised.

  The second on-off valve 136 and the third switching valve 149 are in a fifth state in which oil can flow between the oil chamber 121 of the second regeneration cylinder 115b and the low pressure reservoir 19, and the oil chamber of the second regeneration cylinder 115a. A third switching mechanism is configured to switch between a sixth state in which oil cannot flow between 121 and the low pressure reservoir 19.

  The fourth on-off valve 138 and the fourth switching valve 151 include a seventh state in which oil can flow between the oil chamber 121 of the second regeneration cylinder 115b and the second high pressure accumulator 23, and a second regeneration cylinder 115b. The fourth switching mechanism is configured to switch between the oil chamber 121 and the second high pressure accumulator 23 and the eighth state in which oil cannot flow.

  In addition, the first to fourth switching valves 145, 147, 149, 151 are provided between the oil chamber 121 of the first regeneration cylinder 115a and the oil chamber 121 of the second regeneration cylinder 115b via the circulation channel 139. A fifth switching mechanism is configured to switch between a ninth state in which oil can flow and a tenth state in which oil cannot flow between these oil chambers 121.

  In the engine 3 having the above configuration, as will be described in detail later, in the first regeneration cylinder 115a and the second regeneration cylinder 115b, the oil flowing from one of the first oil port 131 and the second oil port 133 is supplied to the other The operation of discharging from this port is performed. Thereby, the engine 3 functions as an oil pump or a hydraulic motor.

-Control of regenerative system-
Next, the operation and control of the regeneration system 1 will be described.

  The regeneration system 1 performs a regeneration operation and a power running operation as basic operations, and performs an engine output regeneration and a deceleration regeneration as the regeneration operations. Only the second high-pressure accumulator 23 is used for engine output regeneration (second mode). On the other hand, only the first high-pressure accumulator 21 is used for deceleration regeneration (first mode). In addition, since the basic operation | movement is the same as that of the said Embodiment 1 about the deceleration regeneration by the regeneration system 1 of this embodiment, the detailed description is abbreviate | omitted. Further, in the engine output regeneration and power running operation in the regeneration system 1 of the present embodiment, both the low-pressure reservoir and the on-off valves 81 and 24 of the second high-pressure accumulator 23 are opened by the control device 25 as in the first embodiment. It is assumed that

<Engine output regeneration>
As in the first embodiment, when the control device 25 tries to drive the engine 3 at an operating point with good engine operating efficiency, the surplus torque is maintained even if the driving state corresponding to the driving request of the driver is realized. Regenerates the engine output when this occurs. The control device 25 performs full output regeneration and partial output regeneration as engine output regeneration. These full output regeneration and partial output regeneration are switched according to the magnitude of the surplus torque.

  The full output regeneration and the partial output regeneration will be described below with reference to FIGS. FIG. 11 is a first stroke diagram during full output regeneration. FIG. 12 is a conceptual diagram showing the state of the engine 3 along the line XII-XII in FIG. FIG. 13 is a second stroke diagram during full power regeneration. FIG. 14 is a conceptual diagram showing the state of the engine 3 along the XIV-XIV line in FIG. 13. FIG. 15 is a third stroke diagram during full output regeneration. FIG. 16 is a conceptual diagram showing the state of the engine 3 along the XVI-XVI line of FIG. FIG. 17 is a fourth stroke diagram during full output regeneration. FIG. 18 is a conceptual diagram showing the state of the engine 3 along the line XVIII-XVIII in FIG. FIG. 19 is a fifth stroke diagram during partial output regeneration. FIG. 20 is a sixth stroke diagram during partial output regeneration.

<All power regeneration>
The all output regeneration is a process for regenerating all the hydraulic energy of oil sent by the oil pump function of the engine 3 at the time of engine output regeneration. The full power regeneration includes a first stroke, a second stroke, a third stroke, and a fourth stroke. In these first to fourth strokes, the first regeneration cylinder 115a and the second regeneration cylinder 115b of the engine 3 and the piston 117 inside thereof function as an oil pump.

  In the first stroke of full power regeneration, as shown in FIGS. 11 and 12, the first combustion cylinder 113a is in the compression stroke, and the second combustion cylinder 113b is in the exhaust stroke. In the first stroke, the control device 25 places the first to fourth switching valves 145, 147, 149, 151 in the first communication state. Then, the control device 25 opens the first on-off valve 135 (first state), closes the second on-off valve 136 (fourth state), and closes the third on-off valve 137 (sixth state). ), The fourth on-off valve is opened (seventh state). In the first stroke, both the oil chambers 121 and the circulation flow path 139 of the first regeneration cylinder 115a and the second regeneration cylinder 115b are shut off (tenth state).

  At this time, since the piston 117 of the first regeneration cylinder 115 moves downward, the oil in the low pressure reservoir 19 flows into the oil chamber 121 of the first regeneration cylinder 115a via the first port 131. On the other hand, since the piston 117 of the second regeneration cylinder 115b moves upward, oil is discharged from the oil chamber 121 of the second regeneration cylinder 115b to the low pressure side oil flow path 111 via the second port 133. The second high pressure accumulator 23 is sent. As a result, the internal pressure of the second high pressure accumulator 23 rises and the pressurized oil is accumulated in the second high pressure accumulator 23.

  In the second stroke of full power regeneration, as shown in FIGS. 13 and 14, the first combustion cylinder 113a is in the combustion stroke and the second combustion cylinder 113b is in the intake stroke. Also in the second stroke, the control device 25 places the first to fourth switching valves 145, 147, 149, 151 in the first communication state. Then, the control device 25 closes the first on-off valve 135 (second state), opens the second on-off valve 136 (third state), and opens the third on-off valve 137 (fifth state). ) And the fourth on-off valve is closed (eighth state). Even in the second stroke, both the oil chambers 121 and the circulation flow path 139 of the first regeneration cylinder 115a and the second regeneration cylinder 115b are shut off (tenth state).

  At this time, since the piston 117 of the first regeneration cylinder 115a is moved upward, oil is discharged from the oil chamber 121 of the first regeneration cylinder 115a to the low pressure side oil passage 111 via the second port 133. And sent to the second high-pressure accumulator 23. As a result, the internal pressure of the second high pressure accumulator 23 rises and the pressurized oil is accumulated in the second high pressure accumulator 23. On the other hand, since the piston 117 of the second regeneration cylinder 115b moves downward, the oil in the low pressure reservoir 19 flows into the oil chamber 121 of the second regeneration cylinder 115b via the first port 131.

  In the third stroke of full power regeneration, as shown in FIGS. 15 and 16, the first combustion cylinder 113a is in the exhaust stroke, and the second combustion cylinder 113b is in the compression stroke. In this third stroke, the control device 25 causes the first to fourth on-off valves 135, 136, 137, 138 and the first to fourth switching valves 145, 147, 149, 151 to be the same as in the first stroke of full output regeneration. State.

  At this time, since the piston 117 of the first regeneration cylinder 115a is moved downward and the piston 117 of the second regeneration cylinder 115b is moved upward, the first regeneration cylinder is the same as in the first stroke of all output regeneration. The oil from the low pressure reservoir 19 flows into the oil chamber 121 of 115a, and the oil is sent from the oil chamber 121 of the second regeneration cylinder 115b to the second high pressure accumulator 23 so that the pressurized oil is second. Accumulated in the high pressure accumulator 23.

  In the fourth stroke of full power regeneration, as shown in FIGS. 17 and 18, the first combustion cylinder 113a is in the intake stroke, and the second combustion cylinder 113b is in the combustion stroke. In this fourth stroke, the control device 25 causes the first to fourth on-off valves 135, 136, 137, 138 and the first to fourth switching valves 145, 147, 149, 151 to be the same as in the second stroke of full output regeneration. State.

  At this time, since the piston 117 of the first regeneration cylinder 115a is moved upward and the piston of the second regeneration cylinder 115b is moved downward, as in the second stroke, the oil chamber 121 of the first regeneration cylinder 115a. Is sent to the second high pressure accumulator 23, and the pressurized oil is accumulated in the second high pressure accumulator 23, and the oil from the low pressure reservoir 19 is put in the oil chamber 121 of the second regeneration cylinder 115b. Inflow.

  When this fourth stroke is completed, the process returns to the first stroke. During the execution of all output regeneration, these first to fourth steps are repeated. By doing so, surplus torque during traveling of the vehicle is accumulated in the second high-pressure accumulator 23 as hydraulic energy.

<Partial output regeneration>
The partial output regeneration is a process for partially regenerating the hydraulic energy of oil sent by the oil pump function of the engine 3 at the time of engine output regeneration. This partial output regeneration includes a fifth stroke and a sixth stroke in addition to the first to fourth strokes of full output regeneration. Also in the fifth and sixth strokes, the first regeneration cylinder 115a and the second regeneration cylinder 115b of the engine 3 and the piston 117 inside thereof function as an oil pump.

  In the fifth stroke of partial output regeneration, as shown in FIG. 19, the first combustion cylinder 113a is in the exhaust stroke and the second combustion cylinder 113b is in the compression stroke, as in the first stroke of full output regeneration. . In the fifth stroke, the control device 25 closes the first to fourth on-off valves 135, 136, 137, and 138, respectively. Then, the control device 25 sets the second switching valve 147 and the third switching valve 149 to the first communication state, and sets the first switching valve 145 and the fourth switching valve 151 to the second communication state (the ninth state). .

  At this time, since the piston 117 of the second regeneration cylinder 115b moves upward, the oil from the oil chamber 121 of the second regeneration cylinder 115b enters the first circulation flow path 141 through a part of the second port 133. Discharged. Further, since the piston 117 of the first regeneration cylinder 115a is moved downward, the oil flowing through the first circulation passage 141 passes through a part of the first port 131 to the oil chamber 121 of the first regeneration cylinder 115a. Inflow. Thus, oil is sent from the oil chamber 121 of the second regeneration cylinder 115b to the oil chamber 121 of the first regeneration cylinder 115a.

  In the sixth stroke of partial output regeneration, as shown in FIG. 20, the first combustion cylinder 113a is in the intake stroke and the second combustion cylinder 113b is in the combustion stroke, as in the fourth stroke of full output regeneration. . Also in the sixth stroke, the control device 25 closes the first to fourth on-off valves 135, 136, 137, and 138, respectively. Then, the control device 25 sets the first switching valve 145 and the fourth switching valve 151 to the first communication state, and sets the second switching valve 147 and the third switching valve 149 to the second communication state (the ninth state). .

  At this time, since the piston 117 of the first regeneration cylinder 115a is moving upward, the oil from the oil chamber 121 of the first regeneration cylinder 115a enters the second circulation flow path 143 via a part of the second port 133. Discharged. Further, since the piston 117 of the second regeneration cylinder 115b moves downward, the oil flowing through the second circulation passage 143 enters the oil chamber 121 of the second regeneration cylinder 115b via a part of the first port 131. Inflow. Thus, oil is sent from the oil chamber 121 of the first regeneration cylinder 115a to the oil chamber 121 of the second regeneration cylinder 115b.

  In the partial output regeneration, the control device 25 performs the fifth stroke and the sixth stroke by appropriately combining the first stroke to the fourth stroke. If the regenerative operation is performed while switching between the partial output regeneration and the full output regeneration as described above, the engine load required to send the oil to the second high-pressure accumulator 23 by the oil pump function of the engine 3, that is, bear the load. The engine output torque can be adjusted to increase the engine operating efficiency.

<Powering>
Moreover, the regeneration system 1 of this Embodiment 2 performs full load power running and partial load power running as power running. These full load power running and partial load power running will be described below with reference to FIGS.

  FIG. 21 is a first stroke diagram during full load power running. FIG. 22 is a conceptual diagram showing the state of the engine 3 along the line XXII-XXII in FIG. FIG. 23 is a second stroke diagram during full load power running. FIG. 24 is a conceptual diagram showing the state of the engine 3 along the line XXIV-XXIV in FIG. FIG. 25 is a third stroke diagram during partial load power running. FIG. 26 is a fourth stroke diagram during partial load power running.

  As in the first embodiment, the control device 25 performs power running when the vehicle C starts, decelerates or accelerates from steady travel, or travels uphill. In the power running of the present embodiment, switching between full load power running and partial load power running is performed according to the magnitude of the driving force required for vehicle travel.

<Full load power running>
The full load power running is a process in which all the discharge pressure of oil discharged from the second high pressure accumulator 23 is loaded on the engine 3 and all the hydraulic energy is used for power running. This full load power running includes a first stroke and a second stroke. In these first and second strokes, as shown in FIGS. 21 to 24, the first combustion cylinder 113a and the second combustion cylinder 113b are both deactivated, and the intake valve 127 in both the cylinders 113a and 113b. And the exhaust valve 129 are both opened.

  The first stroke of the full load power running is a stroke in which the piston 117 of the first regeneration cylinder 115a is moved downward and the piston 117 of the second regeneration cylinder 115b is moved upward. In the first stroke, the control device 25 places the first to fourth switching valves 145, 147, 149, 151 in the first communication state. Then, the control device 25 closes the first on-off valve 135 (second state), opens the second on-off valve 136 (third state), and opens the third on-off valve 137 (fifth state). ), The fourth on-off valve 138 is closed (eighth state). In the first stroke, both the oil chambers 121 and the circulation flow path 139 of the first regeneration cylinder 115a and the second regeneration cylinder 115b are shut off (tenth state).

  Then, the pressure of the oil accumulated in the second high pressure accumulator 23 is applied to the piston 117 of the first regeneration cylinder 115a via the second high pressure side oil flow path 111 and the second port 133, and FIG. 21 and FIG. As shown, the oil discharged from the second high pressure accumulator 23 flows into the oil chamber 121 of the first regeneration cylinder 115a. Then, the piston 117 of the first regeneration cylinder 115a is moved downward by the inflow pressure of the oil, and the output shaft 4 of the engine 3 is rotated by the downward movement. The rotation of the output shaft 4 causes the piston 117 of the second regeneration cylinder 115b to move upward, and the upward movement causes the oil chamber 121 of the second regeneration cylinder 115b to pass through the first port 131 and the low pressure side oil passage 61. Oil is sent to the low pressure reservoir 19.

  The second stroke of the full load power running is a stroke in which the piston 117 of the first regeneration cylinder 115a is moved up and the piston 117 of the second regeneration cylinder 115b is moved down. Also in the second stroke, the control device 25 sets the first to fourth switching valves 145, 147, 149, 151 to the first communication state. Then, the control device 25 opens the first on-off valve 135 (first state), closes the second on-off valve 136 (fourth state), and closes the third on-off valve 137 (sixth state). ), The fourth on-off valve 138 is opened (seventh state). Even in the second stroke, both the oil chambers 121 and the circulation flow path 139 of the first regeneration cylinder 115a and the second regeneration cylinder 115b are shut off (tenth state).

  Then, the oil pressure accumulated in the second high-pressure accumulator 23 is applied to the piston 117 of the second regeneration cylinder 115b via the second high-pressure side oil passage 111 and the second port 133, and FIG. 23 and FIG. As shown, the oil discharged from the second high pressure accumulator 23 flows into the oil chamber 121 of the second regeneration cylinder 115b. Then, the piston 117 of the second high-pressure accumulator 23 is moved downward by the inflow pressure of the oil, and the output shaft 4 of the engine 3 is rotated by the downward movement. The rotation of the output shaft 4 causes the piston 117 of the first regeneration cylinder 115a to move upward, and the upward movement causes the low pressure from the oil chamber 121 of the first regeneration cylinder 115a through the first port 131 and the low pressure side oil port 61. Oil is sent to the reservoir 19.

  When this second stroke is completed, the process returns to the first stroke. During the execution of the full load power running, the first stroke and the second stroke are repeated. By doing so, the hydraulic energy accumulated in the second high-pressure accumulator 23 is used for hydraulic traveling of the automobile C.

<Partial load power running>
The partial load power running is a process in which a part of the discharge pressure of oil discharged from the second high pressure accumulator 23 is loaded on the engine 3 and the hydraulic energy is partially used for power running. This partial load power running includes a third stroke and a fourth stroke in addition to the first stroke and the second stroke of the full load power running. Also in these third and fourth strokes, as shown in FIGS. 25 and 26, the first combustion cylinder 113a and the second combustion cylinder 113b are both deactivated, and the intake valve 127 in both the cylinders 113a and 113b. And the exhaust valve 129 are both opened.

  The third stroke of the partial load power running is a stroke of sending oil from the oil chamber 121 of the second regeneration cylinder 115b to the oil chamber 121 of the first regeneration cylinder 115a via the second circulation channel 143. In the third stroke, the control device 25 closes the first to fourth on-off valves 135, 136, 137, and 138, respectively. Then, the control device 25 sets the first switching valve 145 and the fourth switching valve 151 to the first communication state, and sets the second switching valve 147 and the third switching valve 149 to the second communication state (the ninth state). .

  Then, the pressure of the oil accumulated in the second high pressure accumulator 23 is not applied to any piston 117 of the first regeneration cylinder 115a and the second regeneration cylinder 115b, but the output shaft 4 of the engine 3 Due to the rotation due to the inertial force, the piston 117 of the first regeneration cylinder 115a moves downward and the piston 117 of the second regeneration cylinder 115b moves upward. As a result, as shown in FIG. 25, oil is discharged from the oil chamber 121 of the second regeneration cylinder 115b to the first circulation passage 141 through a part of the first port 131, and the discharged oil is discharged. The oil flows into the oil chamber 121 of the first regeneration cylinder 115a through a part of the second port 133. Thus, oil is sent from the oil chamber 121 of the second regeneration cylinder 115b to the oil chamber 121 of the first regeneration cylinder 115a.

  The fourth stroke of the partial load power running is a stroke in which oil is sent from the oil chamber 121 of the first regeneration cylinder 115a to the oil chamber 121 of the second regeneration cylinder 115b via the first circulation channel 141. Also in the fourth stroke, the control device 25 closes the first to fourth on-off valves 135, 136, 137, and 138, respectively. Then, the control device 25 sets the second switching valve 147 and the third switching valve 149 to the first communication state, and sets the first switching valve 145 and the fourth switching valve 151 to the second communication state (the ninth state). .

  Also in the fourth stroke, the pressure of the oil accumulated in the second high pressure accumulator 23 is not applied to any piston 117 of the first regeneration cylinder 115a and the second regeneration cylinder 115b. As a result of the rotation of the output shaft 4 due to the inertial force, the piston 117 of the first regeneration cylinder 115a moves up and the piston 117 of the second regeneration cylinder 115b moves down. As a result, as shown in FIG. 26, oil is discharged from the oil chamber 121 of the first regeneration cylinder 115a to the first circulation channel 141 through a part of the first port 131, and the discharged oil is discharged. It flows into the oil chamber 121 of the second regeneration cylinder 115b through a part of the second port 133. Thus, oil is sent from the oil chamber 121 of the first regeneration cylinder 115a to the oil chamber 121 of the second regeneration cylinder 115b.

  In the partial load power running, the control device 25 performs the third stroke and the fourth stroke in combination with the first stroke and the second stroke as appropriate. If the power running operation is performed while switching between the partial load power running and the full load power running, the driving force of the engine 3 obtained by the power running can be adjusted, and the start and the acceleration running suitable for the driving request can be realized.

-Effect of Embodiment 2-
According to the regenerative system 1 according to the second embodiment, the regenerative operation using only the first high-pressure accumulator 21 is performed during deceleration regeneration, and the regenerative operation using only the second high-pressure accumulator 23 is performed during engine output regeneration. Therefore, at the time of deceleration regeneration, the first high pressure accumulator 21 having a relatively large oil storage capacity secures an energy amount that can be regenerated by the regenerative operation, and at the time of engine output regeneration, the oil storage capacity is relatively small. 2 Using the high-pressure accumulator 23, it is possible to execute fine regeneration and power running control such that regenerative operation and power running operation are repeated in a relatively short period of time. Thereby, the amount of energy that can be regenerated while the vehicle is running can be earned to improve fuel efficiency.

  Further, according to the regenerative system 1 according to the second embodiment, since the oil pump motor is configured integrally with the engine 3, compared to the case where an oil pump motor for regenerating the engine output is provided separately from the engine 3. Therefore, the regenerative system 1 can be made compact.

  In the engine 3 also serving as such an oil pump motor, the surplus torque of the engine 3 is directly converted into hydraulic energy by the reciprocating motion of the piston 117 of the first regeneration cylinder 115a and the second regeneration cylinder 115b, and the second Since the hydraulic energy of the oil discharged from the high pressure accumulator 23 is directly converted into output torque by the reciprocating motion of the pistons 117 of both the regenerative cylinders 115a and 115b, mechanical loss in power transmission during engine output regeneration and power running Can be suppressed, and the regeneration efficiency of surplus torque can be improved.

  As described above, a preferred embodiment has been described as an example of the technique disclosed herein. However, the technology disclosed herein is not limited to this, and can also be applied to embodiments in which changes, replacements, additions, omissions, etc. have been made as appropriate. Moreover, it is also possible to combine each component demonstrated by the said embodiment into a new embodiment. In addition, the constituent elements described in the accompanying drawings and the detailed description may include constituent elements that are not essential for solving the problem. For this reason, it should not be immediately recognized that these non-essential components are essential because they are described in the accompanying drawings and detailed description.

  For example, the following embodiment may be configured as follows.

  In the first embodiment, the first mode in which only the first high pressure accumulator 21 is used based on the level of engine operation efficiency depending on the regenerative state, the second mode in which only the second high pressure accumulator 23 is used, and the first high pressure Although the regenerative system 1 that uses the third mode using both the pressure accumulator 21 and the second high-pressure accumulator 23 has been described, the first mode and the third mode are not limited to this, so that the engine operating efficiency is improved. Only the two modes may be used properly, or only the second mode and the third mode may be used properly.

  In the second embodiment, the regenerative system 1 that selectively uses the first mode in which only the first high-pressure accumulator 21 is used and the second mode in which only the second high-pressure accumulator 23 is used for deceleration regeneration and engine output regeneration is described. However, the present invention is not limited to this, and when the first high-pressure accumulator 21 stores a full amount of oil and cannot perform deceleration regeneration in the first mode beyond that, the clutch 6 is connected to reduce the speed during deceleration traveling. The braking force may be transmitted to the engine 3 and the deceleration regeneration may be performed by sending the oil in the low pressure reservoir 19 to the second high pressure accumulator 23 by the oil pump function of the engine 3.

  In the second embodiment, the first to fourth switching valves 145 to 151 also serve as the first to fifth switching mechanisms, that is, a configuration in which a part of the first to fifth switching mechanisms is shared. Although it gave as an example, it is not restricted to this, The 1st-5th switching mechanism may be comprised by the completely independent separate apparatus and structure.

  In FIG. 27, the partial structure of the regeneration system 1 which concerns on the modification of the said Embodiment 2 is shown. In the second embodiment, the configuration in which the oil pump motor 17 is provided on the drive wheel side of the transmission 7 has been described as an example. However, the present invention is not limited to this, and the regeneration efficiency due to engine output regeneration is more than the regeneration efficiency due to deceleration regeneration. In the case where the oil pump motor 17 is also emphasized, the oil pump motor 17 may be provided between the transmission 7 and the engine 3 as shown in FIG.

  In this case, the clutch includes a clutch 6 that switches the connection state with the output shaft 4 of the engine 3 and a clutch 7a of the transmission 7, and the clutch 6 is disengaged during coasting when a large driving force is not generated. Then, the engine 3 is stopped, and when there is an acceleration request from there, the clutch 7a between the motor and the drive wheels 11 is connected to shift to engine running. By doing so, there is little influence on the vehicle acceleration, and a quick transition to engine running becomes possible. This is particularly effective when the amount of regenerated hydraulic energy is small, and the engine 3 can be started quickly even if it does not contribute significantly to the driving force of the automobile C.

  As described above, the technology disclosed herein is useful for a vehicle regeneration system including a high-pressure accumulator that stores oil and gas under pressure.

DESCRIPTION OF SYMBOLS 1 ... Regenerative system, 3 ... Engine, 4 ... Output shaft, 5 ... 1st clutch, 6 ... Clutch,
7 ... Transmission, 9 ... Differential gear, 11 ... Drive wheels,
13 ... coupling mechanism, 15 ... second clutch, 17 ... oil pump motor,
19 ... Low pressure reservoir, 21 ... First high pressure accumulator, 23 ... Second high pressure accumulator, 24 ... Open / close valve,
25 ... Control device, 27 ... Intake passage, 29 ... Throttle, 31 ... Exhaust passage,
33 ... Catalyst device, 35 ... Muffler, 37 ... Reservoir container, 39 ... Piston,
41 ... Oil chamber, 43 ... Gas chamber, 45 ... Accumulator, 47 ... Piston, 49 ... Oil chamber,
51 ... Gas chamber, 53 ... Pressure vessel, 55 ... Piston, 57 ... Oil chamber, 59 ... Gas chamber,
61 ... Low pressure side oil flow path, 63 ... High pressure side oil flow path, 65 ... First flow path,
67 ... 2nd flow path, 73 ... Inflow branch path, 75 ... Outflow branch path, 77 ... 1st switching valve,
79 ... 2nd switching valve, 81, 83 ... On-off valve, 85 ... 1st pressure sensor,
87 ... second pressure sensor, 89 ... PM discharge amount sensor, 91 ... PM rotational speed sensor,
93 ... Engine speed sensor, 95 ... Accelerator sensor, 97 ... Brake sensor,
99 ... Vehicle speed sensor, 101 ... Target operating point setting unit, 103 ... Target PM consumption torque calculation unit,
105 ... Predicted PM consumption torque calculation unit, 107 ... Storage unit,
109: first high pressure side oil flow path, 111: second high pressure side oil flow path,
113a ... first combustion cylinder, 113b ... second combustion cylinder,
115a ... first regeneration cylinder, 115b ... second regeneration cylinder, 117 ... piston,
119 ... Combustion chamber, 121 ... Oil chamber, 123 ... Intake port, 125 ... Exhaust port,
127 ... Intake valve, 129 ... Exhaust valve, 131 ... First oil port,
133 ... 2nd oil port, 135 ... 1st on-off valve, 136 ... 2nd on-off valve,
137 ... third on-off valve, 138 ... fourth on-off valve, 139 ... circulation flow path,
141 ... 1st circulation flow path, 143 ... 2nd circulation flow path, 145 ... 1st switching valve,
147 ... second switching valve, 149 ... third switching valve, 151 ... fourth switching valve

Claims (8)

An oil pump motor having both functions of an oil pump and a hydraulic motor;
A low pressure reservoir and a high pressure accumulator connected via the oil pump motor and storing oil and gas under pressure;
A regenerative system for a vehicle comprising: a regenerative operation for causing the oil pump motor to function as an oil pump; and a control device for controlling a power running operation for causing the oil pump motor to function as a hydraulic motor,
The high pressure accumulator includes a first high pressure accumulator having a relatively large oil storage capacity, and a second high pressure accumulator having a relatively small oil storage capacity,
The first high pressure accumulator and the second high pressure accumulator are connected via a flow path,
In the regenerative operation, the control device includes a first mode that uses only the first high-pressure accumulator, a second mode that uses only the second high-pressure accumulator, the first high-pressure accumulator, Use at least two modes among the third mode using both of the second high pressure accumulators,
In the third mode, the oil stored in the second high pressure accumulator in the second mode is sent to the first high pressure accumulator through the flow path. . An oil pump motor having both functions of an oil pump and a hydraulic motor;
A low pressure reservoir and a high pressure accumulator connected via the oil pump motor and storing oil and gas under pressure;
A regenerative system for a vehicle comprising: a regenerative operation for causing the oil pump motor to function as an oil pump; and a control device for controlling a power running operation for causing the oil pump motor to function as a hydraulic motor,
The high pressure accumulator includes a first high pressure accumulator having a relatively large oil storage capacity, and a second high pressure accumulator having a relatively small oil storage capacity,
A first state in which oil can flow between the oil pump motor and the first high pressure accumulator; and a second state in which oil can flow between the oil pump motor and the second high pressure accumulator. A first switching mechanism for switching;
A third state in which oil can flow between the first high pressure accumulator and the second high pressure accumulator, and a third state in which oil cannot flow between the first high pressure accumulator and the second high pressure accumulator. A second switching mechanism for switching between the four states;
The oil pump motor is connected to the output shaft of the engine,
The control device performs engine output regeneration that regenerates surplus torque of the engine during steady traveling or acceleration traveling, and controls the first switching mechanism and the second switching mechanism according to the regeneration state during the engine output regeneration. Thus, the first mode using only the first high pressure accumulator, the second mode using only the second high pressure accumulator, and the first mode using both the first high pressure accumulator and the second high pressure accumulator. a third mode, the vehicle regeneration system, wherein the separating have used to improve the engine operating efficiency. In the vehicle regeneration system according to claim 2,
The controller is
Set a target operating point to improve engine operating efficiency based on the operating state of the engine,
During the engine output regeneration, the engine is in a first regeneration state in which the engine operating efficiency at the target operating point is achieved by sending oil to the first high pressure accumulator, or the oil is sent to the first high pressure accumulator. However, it is determined whether the engine is in the second regeneration state where the engine operating efficiency at the target operating point is not achieved,
When in the first regeneration state, the first switching mechanism performs the regeneration operation in the first mode as the first state,
When in the second regenerative state, the second switching mechanism causes the second state to be set to the second state, and when the pressure of the second high pressure accumulator is less than a predetermined set pressure, The regenerative operation performed in the second mode as the fourth state, and the third state performed in the third mode by the second switching mechanism when the pressure of the second high pressure accumulator is equal to or higher than the predetermined set pressure. A vehicle regeneration system characterized by repeating the regeneration operation. An oil pump motor having both functions of an oil pump and a hydraulic motor;
A low pressure reservoir and a high pressure accumulator connected via the oil pump motor and storing oil and gas under pressure;
A regenerative system for a vehicle comprising: a regenerative operation for causing the oil pump motor to function as an oil pump; and a control device for controlling a power running operation for causing the oil pump motor to function as a hydraulic motor,
The high pressure accumulator includes a first high pressure accumulator having a relatively large oil storage capacity, and a second high pressure accumulator having a relatively small oil storage capacity,
The oil pump motor includes a first oil pump motor connected to the output shaft of the transmission, and a second oil pump motor connected to the output shaft of the engine,
The first high pressure accumulator and the low pressure reservoir are connected via the first oil pump motor,
The second high pressure accumulator and the low pressure reservoir are connected via the second oil pump motor,
The controller is
Whether the engine is in a first regeneration state in which deceleration regeneration is performed to regenerate braking torque during deceleration travel, or is in a second regeneration state in which engine output regeneration is performed to regenerate surplus torque of the engine during steady travel or acceleration travel And
Wherein in some cases the first regenerative state, the regenerative operation of the first oil pump motor Ri send oil to the first high-pressure accumulator to function as an oil pump, in the first mode using the first high-pressure accumulator And
Wherein in some cases the second regenerative state, the regenerative operation of the second oil pump motor Ri send oil to the second high-pressure accumulator to function as an oil pump, in the second mode using the second high-pressure accumulator A vehicle regeneration system characterized in that In the vehicle regeneration system according to claim 4,
The engine has a regenerative cylinder fitted with a piston capable of reciprocating in conjunction with the rotation operation of the output shaft,
The regenerative cylinder and the piston form an oil chamber connected to the low pressure reservoir and the second high pressure accumulator,
The second oil pump motor includes the regeneration cylinder and the piston, and is configured integrally with the engine. In the vehicle regeneration system according to claim 5,
The regenerative cylinder has a first regenerative cylinder and a second regenerative cylinder,
A first state where oil can flow between the oil chamber of the first regeneration cylinder and the low pressure reservoir; and a first state where oil cannot flow between the oil chamber of the first regeneration cylinder and the low pressure reservoir. A first switching mechanism for switching between two states;
Between the third state in which oil can flow between the oil chamber of the first regeneration cylinder and the second high pressure accumulator, and between the oil chamber of the first regeneration cylinder and the second high pressure accumulator. A second switching mechanism that switches between a fourth state in which oil cannot flow;
A fifth state in which oil can flow between the oil chamber of the second regeneration cylinder and the low pressure reservoir; and a fifth state in which oil cannot flow between the oil chamber of the second regeneration cylinder and the low pressure reservoir. A third switching mechanism for switching between six states;
A seventh state in which oil can flow between the oil chamber of the second regeneration cylinder and the second high pressure accumulator; and between the oil chamber of the second regeneration cylinder and the second high pressure accumulator. A fourth switching mechanism that switches between an eighth state in which oil cannot flow;
A ninth state in which oil can flow between the oil chamber of the first regeneration cylinder and the oil chamber of the second regeneration cylinder; the oil chamber of the first regeneration cylinder and the second regeneration cylinder; A vehicle regeneration system, further comprising: a fifth switching mechanism that switches between a tenth state in which oil cannot flow with the oil chamber. The vehicle regeneration system according to claim 6,
The reciprocating operation of the piston of the first regenerative cylinder and the piston of the second regenerative cylinder is an opposite operation in which the phases are shifted by 180 degrees,
The control device, during regenerative operation in the second mode,
By controlling the first to fifth switching mechanisms so as to send all the oil discharged from the oil chambers of the first regeneration cylinder and the second regeneration cylinder to the second high pressure accumulator, the oil A first regenerative operation for regenerating all the hydraulic energy of the oil sent by the pump motor;
Part of the oil discharged from the oil chamber of at least one of the first regeneration cylinder and the second regeneration cylinder flows into the oil chamber of the other regeneration cylinder. A vehicle regenerative system that performs a second regenerative operation for partially regenerating hydraulic energy of oil sent by the oil pump motor by controlling a fifth switching mechanism. The vehicle regeneration system according to claim 6,
The reciprocating operation of the piston of the first regenerative cylinder and the piston of the second regenerative cylinder is an opposite operation in which the phases are shifted by 180 degrees,
The control device, during powering operation using the second high-pressure accumulator,
By controlling the first to fifth switching mechanisms so as to send all the oil discharged from the oil chambers of the first regeneration cylinder and the second regeneration cylinder to the low pressure reservoir, the second high pressure accumulation A first power running operation in which all hydraulic energy of oil discharged from the container is used for power running;
Part of the oil discharged from the oil chamber of at least one of the first regeneration cylinder and the second regeneration cylinder flows into the oil chamber of the other regeneration cylinder. A vehicle regenerative system that performs a second power running operation in which hydraulic energy of oil discharged from the second high pressure accumulator is partially used for power running by controlling a fifth switching mechanism.

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