JP2013184613A - Control device of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device of a vehicle which can make favorable the fuel economy of an internal combustion engine at transition.SOLUTION: A control device (200) of a vehicle (5) comprises a control part which acquires an auxiliary output being an output of an auxiliary output device (30) at transition, estimates an auxiliary output at a time point after a prescribed time has elapsed by using an index indicating that the acquired auxiliary output approximates to which level of a target value of the auxiliary output at the time point after the prescribed time has elapsed rather than an acquired time point being a time point at which the auxiliary output is acquired, controls an internal combustion engine so as to compensate for a difference between a requirement output required to the internal combustion engine (10) and the auxiliary output at the time point after the prescribed time has elapsed by using a change of an output of the internal combustion engine, and controls a transmission so as to have a change gear ratio of the transmission (20) conforming to the output of the internal combustion engine after the output is changed. When the requirement output is changed at the transition, the control part corrects the index on the basis of a change form of the requirement output.

Description

  The present invention relates to a vehicle control device.

  2. Description of the Related Art Conventionally, a vehicle having an internal combustion engine and a transmission (for example, CVT, AT, etc.) capable of controlling a gear ratio by a control device is known. For example, Patent Document 1 discloses a vehicle including a CVT as a transmission. Conventionally, an auxiliary output device that assists the output of an internal combustion engine by driving using waste heat of the internal combustion engine is known. As such an auxiliary output device, for example, Patent Document 2 discloses an output of an internal combustion engine by transmitting the output of an expander that is driven by introduction of steam generated by waste heat of the internal combustion engine to the internal combustion engine. An auxiliary output device for assisting is disclosed.

JP 2010-149696 A JP 2002-115574 A

  An auxiliary output device that assists the output of the internal combustion engine by driving using the waste heat of the internal combustion engine as exemplified in Patent Document 2 and a transmission and the internal combustion engine as exemplified in Patent Document 1 It is considered that the fuel efficiency of the internal combustion engine can be improved. However, in the case of a vehicle equipped with such an internal combustion engine, a transmission, and an auxiliary output device, during a transient time when the absolute value of the increase speed or decrease speed of the required output required by the driver from the internal combustion engine exceeds a reference value. The output change of the auxiliary output device may be delayed with respect to the output change of the internal combustion engine. If the vehicle is not properly controlled during such a transition, it is difficult to improve the fuel efficiency of the internal combustion engine. However, until now, an appropriate control method has not been developed during the transition of a vehicle including such an internal combustion engine, a transmission, and an auxiliary output device. In addition, since the required output may change further during the transition, it is difficult to improve the fuel efficiency of the internal combustion engine unless the vehicle is appropriately controlled in response to the change in the required output during the transient. is there.

  An object of the present invention is to provide a vehicle control device that can improve the fuel efficiency of an internal combustion engine during a transition.

  A vehicle control apparatus according to the present invention includes an internal combustion engine, a transmission connected to the internal combustion engine, and an auxiliary output device that assists the output of the internal combustion engine by driving using waste heat of the internal combustion engine. A control device applied to a vehicle equipped with the output of the auxiliary output device at a transient time when an absolute value of an increase speed or a decrease speed of a required output, which is an output required for the internal combustion engine, exceeds a reference value. An index is used to acquire a certain auxiliary output and indicate how close the acquired auxiliary output is to the target value of the auxiliary output at a time after a predetermined time from the acquisition time that is the time when the auxiliary output is acquired. The auxiliary output at the time after the predetermined time is estimated, and the difference between the required output and the auxiliary output at the time after the predetermined time is compensated by a change in the output of the internal combustion engine. And a control unit that controls the internal combustion engine and controls the transmission so that the transmission gear ratio matches the output of the internal combustion engine after the output is changed. When the required output changes during the transition, the index is corrected based on the change mode of the required output.

  According to the vehicle control device of the present invention, during transition, the auxiliary output at a predetermined time after the time when the auxiliary output is acquired is estimated, and the required output required for the internal combustion engine and the time after the predetermined time are estimated. The difference from the auxiliary output at can be compensated by the change in the output of the internal combustion engine, and the transmission gear ratio can be made to match the output of the internal combustion engine after the output has changed. In addition, when the required output changes during the transition, the change in the required output during the transient is performed by correcting the index used for estimating the auxiliary output at the time after a predetermined time based on the change mode of the required output. Corresponding to the above, it is possible to estimate the auxiliary output at a time point after a predetermined time. As a result, the internal combustion engine and the transmission can be controlled in response to changes in the required output during the transition. Therefore, the vehicle control apparatus according to the present invention can improve the fuel efficiency of the internal combustion engine during the transition.

  In the above configuration, the control unit multiplies a value obtained by multiplying a value obtained by subtracting the index from a predetermined constant by a value obtained by subtracting the auxiliary output at the acquisition time from the target value, at the acquisition time. The auxiliary output at the time after the predetermined time may be estimated by using the value obtained by adding the auxiliary outputs as the auxiliary output at the time after the predetermined time.

  According to this configuration, it is possible to estimate the auxiliary output at the time after the predetermined time by the calculation while preventing the calculation of the auxiliary output at the time after the predetermined time from diverging.

  In the above configuration, when the required output changes during the transition, the control unit changes the required output so that the required output increases as time elapses before the required output changes. In the case of the first change mode in which the required output increases with the passage of time even after the change, or before the change of the required output, the required output decreases with the passage of time, and the required output even after the change of the required output. In the case of the second change mode in which the value decreases with the passage of time, the value of the index is corrected to a smaller value than before the change of the required output, and when the required output changes during the transition, The change mode of the request output is such that the request output increases with time before the change of the request output and after the change of the request output. In the case of the third change mode in which the required output decreases with the passage of time, or before the change of the required output, the required output decreases with the passage of time, and after the change of the required output, the required output becomes with the passage of time. In the case of the increasing fourth change mode, the value of the index may be corrected to a larger value than before the change of the required output.

  In the case of the first change mode and the second change mode, the auxiliary output at the time after the actual predetermined time is an auxiliary output that is an estimation result when the auxiliary output at the time after the predetermined time is estimated using a constant as an index. It is considered that the target value approaches the target value sooner than the control value. In the case of the first change mode and the second change mode, the control unit corrects the value of the index to a small value. Thus, the error between the auxiliary output at the point of time and the auxiliary output at the point of time after the actual predetermined time can be reduced. On the other hand, in the case of the third change mode and the fourth change mode, the auxiliary output at the time after the actual predetermined time is an estimation result when the auxiliary output at the time after the predetermined time is estimated using a constant as an index. The control unit is considered to approach the target value later than the auxiliary output. In the case of the third change mode and the fourth change mode, the control unit corrects the value of the index to a large value. The error between the auxiliary output at the time point after the time and the auxiliary output at the time point after the actual predetermined time can be reduced. Therefore, according to this configuration, it is possible to improve the estimation accuracy of the auxiliary output at a time point after a predetermined time. As a result, the internal combustion engine and the transmission can be controlled based on the auxiliary output at a point in time after a predetermined time with high estimation accuracy, so that the fuel consumption of the internal combustion engine during the transition can be appropriately improved.

  ADVANTAGE OF THE INVENTION According to this invention, the control apparatus of the vehicle which can make the fuel consumption of the internal combustion engine favorable at the time of a transition can be provided.

FIG. 1 is a schematic diagram illustrating a vehicle to which a control device is applied. FIG. 2 is a schematic diagram for explaining the configuration of the turbine, the electromagnetic clutch, and the turbine pulley. FIG. 3 is a schematic diagram showing the relationship between the fuel consumption of the internal combustion engine and the output of the internal combustion engine. FIG. 4 is a diagram illustrating an example of an index correction coefficient map. FIG. 5 is a diagram illustrating an example of a flowchart of control performed by the control device during transition, and illustrates steps S10 to S80. FIG. 6 is a diagram illustrating an example of a flowchart of control performed by the control device during transition, and illustrates steps S90 to S120. FIG. 7 is a diagram illustrating an example of a flowchart of control performed by the control device during a transition, and shows in detail the control performed in step S120 of FIG. FIG. 8 is a diagram illustrating an example of a timing chart of control performed by the control device during transition.

  Hereinafter, modes for carrying out the present invention will be described.

  A vehicle control apparatus 200 according to Embodiment 1 of the present invention will be described. First, the overall configuration of the vehicle 5 to which the control device 200 is applied will be described, and then the details of the control device 200 will be described. FIG. 1 is a schematic diagram showing the vehicle 5. The vehicle 5 includes an internal combustion engine 10, a transmission 20, an auxiliary output device 30, an accelerator 100, various sensors, and a control device 200.

  The internal combustion engine 10 according to the present embodiment is a gasoline engine. However, the type of the internal combustion engine 10 is not limited to this, and may be a diesel engine or other engines. The internal combustion engine 10 includes a cylinder block 11, a cylinder head 12, a piston 13, a connecting rod 14, a crankshaft 15, and a crank pulley 16.

  A cylinder is formed in the cylinder block 11. In this embodiment, the number of cylinders is one. However, the number of cylinders is not limited to this and may be plural. The cylinder head 12 is disposed above the cylinder block 11. In the present embodiment, the upper and lower parts do not necessarily need to coincide with the upper and lower parts in the direction of gravity. For example, the upper and lower sides in the present embodiment may be in the horizontal direction. The piston 13 is disposed in the cylinder. A combustion chamber 17 is formed in a region surrounded by the cylinder block 11, the cylinder head 12, and the piston 13. The combustion chamber 17 is a space for burning an air-fuel mixture (a gas in which air and fuel injected from a fuel injection valve of the internal combustion engine 10 are mixed).

  The connecting rod 14 is a connecting member that connects the crankshaft 15 and the piston 13. The vertical movement of the piston 13 in the cylinder is transmitted to the crankshaft 15 via the connecting rod 14, and the crankshaft 15 rotates. The crank pulley 16 is connected to the crankshaft 15. When the crankshaft 15 rotates, the crank pulley 16 rotates in synchronization with the crankshaft 15.

  Around the cylinder of the cylinder block 11 is formed a water jacket 18a that is an internal passage through which the refrigerant passes. The cylinder head 12 is also formed with a water jacket 18b, which is an internal passage through which refrigerant passes. The water jackets 18a and 18b according to the present embodiment are connected to each other so that the refrigerant passes through the water jacket 18b after passing through the water jacket 18a. However, the connection mode of the water jackets 18a and 18b is not limited to this. As the refrigerant flows through the water jacket 18a and the water jacket 18b, the internal combustion engine 10 is cooled by the refrigerant. As the refrigerant, a liquid capable of cooling the internal combustion engine 10 such as water or antifreeze can be used. In this embodiment, water is used as an example of the refrigerant.

  The transmission 20 is connected to the crankshaft 15 of the internal combustion engine 10. The transmission 20 is a device that changes the rotation speed of the internal combustion engine 10 to a predetermined rotation speed and transmits the change to an axle (an axis for rotating wheels) of the vehicle 5. As the transmission 20, a transmission whose control gear ratio can be controlled by the control device 200 can be used. In this embodiment, as an example of the transmission 20, a CVT (Continuously Variable Transmission) capable of continuously changing a transmission gear ratio from an input shaft in a stepless manner by a combination of a belt, a chain, and a pulley and transmitting the continuously variable transmission; ) Is used. However, the configuration of the transmission 20 is not limited to this, and instead of the CVT, for example, an AT (Automatic Transmission) capable of changing a gear ratio by a combination of a torque converter and a planetary gear may be used. Good.

  The auxiliary output device 30 is a device that assists the output of the internal combustion engine 10 by driving using the waste heat of the internal combustion engine 10. As long as the device has such a function, the specific configuration of the auxiliary output device 30 is not particularly limited, but in this embodiment, as an example, the output of the internal combustion engine 10 is assisted while forming a Rankine cycle. Use an auxiliary output device. Specifically, the auxiliary output device 30 according to the present embodiment includes a superheater 35, a turbine 40, an electromagnetic clutch 50, a turbine pulley 60, and a belt 65 wound around the turbine pulley 60 and the crank pulley 16. , A condenser 70, a pump 75, a fluid passage 80 and a bypass passage 85 that are passages through which the refrigerant passes, and a three-way valve 90.

  The fluid passage 80 communicates the superheater 35, the turbine 40, the condenser 70, and the pump 75. The upstream side of the fluid passage 80 in the flow direction of the refrigerant from the superheater 35 is connected to the water jacket 18 b of the cylinder head 12, and the downstream side of the fluid passage 80 in the flow direction of the refrigerant from the pump 75 is the water jacket 18 a of the cylinder block 11. Connected to. As a result, in the vehicle 5, the water jacket 18b, the fluid passage 80, and the water jacket 18a constitute a loop-shaped fluid circulation passage through which the refrigerant passes.

  The bypass passage 85 is a passage that guides the refrigerant that has passed through the superheater 35 to the condenser 70 by bypassing the turbine 40. In this embodiment, a three-way valve 90 is disposed in a portion of the fluid passage 80 between the superheater 35 and the turbine 40, and the bypass passage 85 includes the three-way valve 90, the turbine 40 of the fluid passage 80, and the condenser. 70 is connected. The three-way valve 90 has a function as a switching valve for switching the refrigerant introduction destination via the superheater 35 between the turbine 40 and the bypass passage 85.

  The superheater 35 is a device that converts the refrigerant that has passed through the fluid passage 80 and is introduced into the superheater 35 with the waste heat of the internal combustion engine 10 into steam. The superheater 35 according to the present embodiment uses the heat of the exhaust gas of the internal combustion engine 10 as an example of waste heat of the internal combustion engine 10. In this case, at least part of the exhaust discharged from the internal combustion engine 10 is introduced into the superheater 35. The superheater 35 heats the refrigerant into steam by exchanging heat between the heat of the exhaust and the heat of the refrigerant.

  The refrigerant (steam) after passing through the superheater 35 is introduced into the turbine 40 via the fluid passage 80. The turbine 40 is a device that is driven by receiving the energy of the refrigerant vapor introduced into the turbine 40. The steam expands through the turbine 40. That is, the turbine 40 has a function as an expander that is driven by the introduction of steam generated by the waste heat of the internal combustion engine 10. The auxiliary output device 30 may include a device other than the turbine 40 as an expander as long as the device can be driven by the introduction of steam generated by waste heat of the internal combustion engine 10.

  FIG. 2 is a schematic diagram for explaining the configuration of the turbine 40, the electromagnetic clutch 50, and the turbine pulley 60. The turbine 40 includes a turbine case 41, a turbine wheel 42, and an output shaft 43 having one end connected to the turbine wheel 42. The turbine wheel 42 is formed with an introduction port 44 and a discharge port 45. A fluid passage 80 shown in FIG. 1 is connected to the inlet port 44 and the outlet port 45. The refrigerant vapor after passing through the superheater 35 passes through the fluid passage 80, flows into the turbine case 41 from the introduction port 44, and is introduced into the turbine wheel 42. The turbine wheel 42 is a member that rotates by receiving the vapor of the refrigerant. When the turbine wheel 42 rotates, the output shaft 43 connected to the turbine wheel 42 also rotates. The refrigerant vapor after passing through the turbine wheel 42 is discharged from the outlet 45 and introduced into the condenser 70 via the fluid passage 80.

  The electromagnetic clutch 50 includes a coil 51 and a rotor 52. The turbine pulley 60 is coupled to the rotor 52. The control device 200 controls energization of the coil 51 and stop of energization. When the coil 51 is energized, the electromagnetic particles enclosed between the output shaft 43 and the rotor 52 are coupled, and as a result, the output shaft 43 and the rotor 52 are engaged. Thereby, the rotation of the output shaft 43 can be transmitted to the turbine pulley 60 via the rotor 52. As shown in FIG. 1, the belt 65 is wound around the turbine pulley 60 and the crank pulley 16, and as a result, the turbine pulley 60 is connected to the crank pulley 16 via the belt 65. Therefore, when the control device 200 energizes the coil 51, the output shaft 43 of the turbine 40 and the crankshaft 15 of the internal combustion engine 10 are connected via the rotor 52, the turbine pulley 60, the belt 65, and the crank pulley 16. It will be. As a result, the rotation of the turbine wheel 42 is transmitted to the crankshaft 15 of the internal combustion engine 10.

  As described above, the electromagnetic clutch 50, the turbine pulley 60, the belt 65, and the crank pulley 16 according to this embodiment have a function as an output transmission device that transmits the output of the turbine 40 to the crankshaft 15. By transmitting the output of the turbine 40 to the crankshaft 15, the rotation of the crankshaft 15 can be assisted. As a result, the output of the internal combustion engine 10 is assisted.

  As shown in FIG. 1, the condenser 70 is a device that liquefies the vapor component of the refrigerant introduced into the condenser 70 by condensing it. The condenser 70 according to the present embodiment cools the vapor component of the refrigerant by exchanging heat with the atmosphere and changes it to a liquid phase refrigerant. Although the specific kind of the condenser 70 is not specifically limited, A radiator can be used as an example. The pump 75 is a device that is driven by being controlled by the control device 200 and pressure-feeds the refrigerant in the fluid passage 80. The pump 75 according to the present embodiment pumps the refrigerant after passing through the condenser 70 toward the water jacket 18a.

  After the refrigerant of the internal combustion engine 10 is vaporized in the superheater 35, the turbine 40 is driven, and then liquefied in the condenser 70, and then pumped by the pump 75 and returned to the internal combustion engine 10. The superheater 35, the turbine 40, the condenser 70, and the pump 75 form a Rankine cycle.

  The accelerator 100 is a pedal operated by the driver of the vehicle 5. The various sensors are sensors that detect information necessary for the operation of the control device 200. In FIG. 1, a crank position sensor 110, an accelerator position sensor 111, a temperature sensor 112, and a torque sensor 113 are shown as examples of various sensors. The crank position sensor 110 detects the position of the crankshaft 15 of the internal combustion engine 10 and transmits the detection result to the control device 200. Control device 200 acquires the crank angle of internal combustion engine 10 based on the detection result of crank position sensor 110. Further, the control device 200 acquires the rotational speed, torque, output, etc. of the internal combustion engine 10 based on the detection result of the crank position sensor 110.

  The accelerator position sensor 111 detects the position of the accelerator 100 and transmits the detection result to the control device 200. Based on the detection result of the accelerator position sensor 111, the control device 200 acquires the accelerator opening and also acquires a required output that is an output required for the internal combustion engine 10. That is, the accelerator position sensor 111 according to the present embodiment has a function as a required output detection unit that detects a required output required for the internal combustion engine 10. However, as long as the required output required for the internal combustion engine 10 can be detected, the required output detection means is not limited to the accelerator position sensor 111. For example, an air flow meter that detects the flow rate of intake air taken into the internal combustion engine 10 can be used as the required output detection means.

  The temperature sensor 112 detects the temperature of the refrigerant and transmits the detection result to the control device 200. The control device 200 acquires the temperature of the refrigerant based on the detection result of the temperature sensor 112. Although the temperature sensor 112 according to the present embodiment detects the temperature of the refrigerant in the water jacket 18a, the temperature detection location of the temperature sensor 112 is not limited to this. For example, the temperature sensor 112 may detect the temperature of the refrigerant in the water jacket 18b, or may detect the temperature of the refrigerant in the fluid passage 80.

  The torque sensor 113 detects torque generated by the turbine 40 (specifically, torque of the output shaft 43 of the turbine 40) and transmits the detection result to the control device 200. Based on the detection result of the torque sensor 113, the control device 200 acquires the torque generated by the turbine 40 and also acquires the output generated by the turbine 40. That is, the torque sensor 113 according to the present embodiment has a function as auxiliary output detection means for detecting the output of the auxiliary output device 30. However, the auxiliary output detection means is not limited to the torque sensor 113 as long as the output of the auxiliary output device 30 can be detected.

  The control device 200 includes a control unit that controls the vehicle 5 and a storage unit that stores information necessary for the operation of the control unit. An electronic control unit (Electronic Control Unit) can be used as the control device 200. In the present embodiment, as an example of the control device 200, an electronic control device including a CPU (Central Processing Unit) 201, a ROM (Read Only Memory) 201, and a RAM (Random Access Memory) 203 is used. The function of the control unit is realized by the CPU 201. The function of the storage unit is realized by the ROM 202 and the RAM 203.

  Next, details of the control device 200 will be described. The control unit of the control device 200 according to this embodiment controls the internal combustion engine 10, the auxiliary output device 30, and the transmission 20 in the vehicle 5. First, control of the internal combustion engine 10 by the control unit will be described. The control unit controls the output of the internal combustion engine 10. The specific control method of the output of the internal combustion engine 10 by the control unit is not particularly limited. For example, the control unit can control the output of the internal combustion engine 10 by controlling the fuel injection amount of the internal combustion engine 10. The control of the fuel injection amount can be executed by controlling the output of a fuel pump that supplies fuel to the fuel injection valve of the internal combustion engine 10, for example. The control unit can also control the output of the internal combustion engine 10 by controlling the intake air flow rate of the internal combustion engine 10. The control of the intake flow rate can be executed by controlling the opening of a throttle valve disposed in the intake passage of the internal combustion engine 10, for example. In the following description, as an example, the control unit increases the fuel injection amount of the internal combustion engine 10 when increasing the output of the internal combustion engine 10 and increases the fuel injection amount of the internal combustion engine 10 when decreasing the output of the internal combustion engine 10. It is assumed that the fuel injection amount is reduced.

  Next, control of the auxiliary output device 30 by the control unit will be described. First, the control unit rotates the pump 75. Thereby, the circulation of the refrigerant starts. The control unit controls the three-way valve 90 so that the superheater 35 and the turbine 40 communicate with each other through the fluid passage 80 and the bypass passage 85 is closed when a predetermined auxiliary output device operation start condition is satisfied, The electromagnetic clutch 50 is controlled so that the output of the turbine 40 is transmitted to the crankshaft 15 (specifically, energization of the coil 51 is started). Thereby, the auxiliary output of the internal combustion engine 10 by the auxiliary output device 30 is started. By performing the output assist of the internal combustion engine 10 by the auxiliary output device 30, the fuel efficiency of the internal combustion engine 10 is improved as compared with the case where the output assist of the internal combustion engine 10 is not performed by the auxiliary output device 30.

  The auxiliary output device operation start condition is not particularly limited, but as an example, the condition that the energy of the steam generated by the superheater 35 has become a value sufficient to drive the turbine 40 is used. it can. As an example of this, the control unit according to the present embodiment satisfies the auxiliary output device start operation condition when the amount of steam generated by the superheater 35 is equal to or greater than a predetermined threshold (hereinafter referred to as a first threshold). It is determined that When the amount of steam generated by the superheater 35 is equal to or greater than the first threshold, the turbine 40 can be driven by the steam, and when it is smaller than the first threshold, it is difficult to drive the turbine 40 by the steam. For the first threshold, an appropriate value is obtained in advance and stored in the storage unit.

  In addition, the control part which concerns on a present Example acquires by estimating the quantity of the vapor | steam produced | generated by the superheater 35 based on the output of the internal combustion engine 10. FIG. In this case, the storage unit stores a map in which the amount of steam and the output of the internal combustion engine 10 are associated, and the control unit stores the steam corresponding to the output of the internal combustion engine 10 acquired based on the detection result of the crank position sensor 110. The amount of steam is obtained by extracting the amount of steam from the map. However, the method of acquiring the amount of steam by the control unit is not limited to this. For example, when the vehicle 5 includes a sensor that detects the amount of steam generated by the superheater 35, the control unit may acquire the amount of steam based on the detection result of the sensor.

  When the auxiliary output device operation start condition is not satisfied, the control unit controls the electromagnetic clutch 50 so that the output of the output shaft 43 of the turbine 40 is not transmitted to the crankshaft 15 (specifically, the energization of the coil 51 is stopped). To do). As a result, the output assistance of the internal combustion engine 10 by the auxiliary output device 30 is stopped.

  Further, the control unit controls the three-way valve 90 so that the refrigerant after passing through the superheater 35 flows into the bypass passage 85 and does not flow into the turbine 40 when a predetermined bypass condition is satisfied. Also in this case, since the refrigerant after passing through the superheater 35 bypasses the turbine 40 and flows into the condenser 70, the auxiliary output device 30 stops the output assistance of the internal combustion engine 10. The bypass condition is not particularly limited, but in the present embodiment, as an example, a condition that the amount of steam generated by the superheater 35 is smaller than the first threshold value is used. By using this condition, it is possible to suppress the steam generated by the superheater 35 from being introduced into the turbine 40 even though the amount of steam is smaller than the first threshold and insufficient to drive the turbine 40. When such low energy steam is introduced into the turbine 40, the steam may condense in the turbine 40, and as a result, the rotation of the output shaft 43 may be hindered. Thus, the occurrence of such a problem can be suppressed.

  As another example of the bypass condition, a condition that the amount of steam generated by the superheater 35 is equal to or greater than the second threshold value may be used. A value that is considered to cause damage to the turbine 40 when the amount of steam generated by the superheater 35 is greater than or equal to the second threshold value may be used as the second threshold value. According to this configuration, damage to the turbine 40 can be suppressed. In this case, a condition that the amount of steam generated by the superheater 35 is equal to or greater than the first threshold value and smaller than the second threshold value may be used as the auxiliary output device operation start condition.

  Next, control of the transmission 20 by the control unit will be described. First, the control unit performs the internal combustion engine in a transition time when the absolute value of the increase speed or the decrease speed of the required output required for the internal combustion engine 10 is equal to or greater than a reference value and in a steady time that is a time other than the transient time. The transmission 20 is controlled so that the transmission gear ratio is suitable for the output of 10.

  Here, the output characteristic of the internal combustion engine 10 has a condition that provides the best fuel efficiency. FIG. 3 is a schematic diagram showing the relationship between the fuel consumption of the internal combustion engine 10 and the output of the internal combustion engine 10. The vertical axis in FIG. 3 represents the torque (N · m) of the internal combustion engine, and the horizontal axis represents the rotational speed (rpm) of the internal combustion engine 10. In FIG. 3, a line indicating the same output is illustrated by an iso-output line 300 (dotted line), and a line indicating the same fuel efficiency is illustrated by an iso-fuel consumption line 301 (thin solid line). Is shown by the optimum fuel consumption line 302 (thick solid line). By controlling the output of the internal combustion engine 10 so that the output corresponds to the optimal fuel consumption line 302, the internal combustion engine 10 can be operated in the state where the fuel consumption of the internal combustion engine 10 is the best.

Therefore, the control unit of the control device 200 controls the gear ratio of the transmission 20 so that the fuel consumption of the internal combustion engine 10 is the best when the transmission 20 is controlled. As an example of the control of the transmission 20, the control device 200 according to the present embodiment uses the following method. First, the storage unit of the control device 200 stores in advance a map that defines the rotational speed of the transmission 20 corresponding to the output of the internal combustion engine 10 at which the fuel efficiency of the internal combustion engine 10 is best. As an example of this map, the storage unit stores the map shown in Table 1.

  In Table 1, as the output of the internal combustion engine 10 increases, the rotational speed of the transmission 20 also increases. In addition, the numerical value of Table 1 is an image value of the output of the internal combustion engine 10 and the rotation speed of the transmission 20, and these numerical values do not necessarily have to be actually used. The control unit acquires the output of the internal combustion engine 10 based on the detection result of the crank position sensor 110, and the rotational speed of the transmission 20 corresponding to the acquired output of the internal combustion engine 10 is stored in the storage unit of Table 1. The gear ratio of the transmission 20 is controlled so as to be extracted from the map and to have the extracted rotation speed. In this way, the control device 200 according to the present embodiment controls the gear ratio of the transmission 20 based on the map of Table 1 so that the gear ratio matches the output of the internal combustion engine 10, and thus the internal combustion engine. The fuel consumption of 10 is the best.

  In addition, the control device 200 further performs the following control process during the transition. Specifically, the control unit acquires the output of the auxiliary output device 30 (hereinafter sometimes referred to as auxiliary output) during the transition. The control unit uses an index indicating how close the auxiliary output is to the target value of the auxiliary output at a time after a predetermined time from the time when the acquired auxiliary output acquires the auxiliary output (hereinafter sometimes referred to as acquisition time). Thus, the auxiliary output at a time point after a predetermined time is estimated. The control unit controls the internal combustion engine 10 so as to compensate for the difference between the requested output and the auxiliary output at the time after a predetermined time by the change in the output of the internal combustion engine 10, and the output of the internal combustion engine 10 after the output has changed. The transmission 20 is controlled so as to obtain a gear ratio suitable for the above.

  When the control unit controls the internal combustion engine 10 so as to compensate for the difference between the required output and the auxiliary output at the time after the predetermined time by the change in the output of the internal combustion engine 10, for example, the auxiliary power at the time when the required output is after the predetermined time. If the output is larger than the output, the difference between the required output and the auxiliary output at a predetermined time point is compensated by increasing the output of the internal combustion engine 10. On the other hand, when the required output is smaller than the auxiliary output at the time after the predetermined time, the difference between the auxiliary output and the required output at the time after the predetermined time is compensated by reducing the output of the internal combustion engine 10.

  Furthermore, when the required output changes during the transition, the control unit corrects the index based on the change mode of the required output. Specifically, the control unit changes the required output when the required output changes during the transition, the required output increases with time before the required output changes, and the required output even after the required output changes. In the first change mode in which the value increases with the passage of time (the value of the demand output is different before and after the change of the demand output), or the demand output decreases with the lapse of time before the demand output changes. In the case of the second change mode in which the required output decreases with the passage of time even after the change of (in addition, the value of the required output is different before and after the change of the required output), the index value is changed before the change of the required output. Compare and correct to a smaller value.

  In addition, when the demand output changes during a transition, the control unit changes the demand output in the manner that the demand output increases with time before the demand output changes, and the demand output changes over time after the demand output changes. In the case of the third change mode that decreases with time, or in the case of the fourth change mode in which the request output decreases with the passage of time before the change of the request output and the request output increases with the passage of time after the change of the request output. The index value is compared with before the change in the required output and corrected to a large value.

  The first change mode is a change mode in which the internal combustion engine 10 is required to be accelerated (that is, the rotational speed is increased) during the transition, and then the internal combustion engine 10 is required to further accelerate. It corresponds to. The second change mode corresponds to a change mode in which the internal combustion engine 10 is required to decelerate (that is, the rotational speed decreases) during the transition, and then the internal combustion engine 10 is required to further decelerate. To do. The third change mode corresponds to a change mode in which the internal combustion engine 10 is required to accelerate during the transition and the internal combustion engine 10 is required to decelerate thereafter. The fourth change mode corresponds to a change mode in which the internal combustion engine 10 is required to decelerate during the transition and then the internal combustion engine 10 is required to accelerate.

  Here, the control unit according to the present embodiment performs the estimation of the auxiliary output at the time point after the predetermined time described above based on the following method. First, the control unit according to the present embodiment calculates the auxiliary output at a time point after a predetermined time from the acquisition time point from the viewpoint of reducing the difference between the auxiliary output at the acquisition time point and the target value within a predetermined time. Therefore, the control unit is obtained by adding the auxiliary output at the acquisition time to the value obtained by multiplying the value obtained by subtracting the index from the predetermined constant by the value obtained by subtracting the auxiliary output at the acquisition time from the target value. The auxiliary output at the time after the predetermined time is estimated by using the obtained value as the auxiliary output at the time after the predetermined time.

More specifically, the control unit estimates the auxiliary output at a time point after a predetermined time by using the auxiliary output calculation formula shown in the following formula (1).
W _J (t _{i + 1} ) = W _J (t _i ) + (W _C (t _i ) −W _J (t _i )) × (A− (α _C (t _i ) + Cz)) (1)

In Expression (1), W _J (t _{i + 1} ) is an auxiliary output at a time point after a predetermined time. W _J (t _i ) is an auxiliary output at the time of acquisition, and the auxiliary output acquired based on the detection result of the torque sensor 113 is used. W _C (t _i ) is a target value of the auxiliary output. As this target value, in this embodiment, the output (auxiliary output) of the auxiliary output device 30 when the output of the auxiliary output device 30 is stabilized after the transition time is used, more specifically, the auxiliary output at the steady state. Is used. Hereinafter, the auxiliary output in the steady state may be referred to as a post-stable auxiliary output.

A is a predetermined constant. The value of the predetermined constant is not particularly limited, but in this embodiment, 1 is used as this constant. (Α _C (t _i ) + Cz) is an index indicating how close the acquired auxiliary output is to the target value of the auxiliary output at a time after a predetermined time from the acquisition time. This index is set to a value smaller than the constant A. Of these indices, α _C (t _i ) is referred to as a delay coefficient. The delay coefficient is also an index indicating how close the acquired auxiliary output is to the target value of the auxiliary output at a point in time after the acquisition point. In the present embodiment, a value extracted from the map is used as the delay coefficient (the details will be described in the description of the flowchart described later). Cz is a coefficient for correcting the index (α _C (t _i )). Cz is referred to as an index correction coefficient.

That is, the expression (1) is obtained by subtracting the index (α _C (t _i ) + Cz) from a predetermined constant (A; 1 in the present embodiment), and the target value of output of the auxiliary output device 30 (after-stable assistance). the value obtained by multiplying the value obtained by subtracting the auxiliary output _(W J _(t i)) at the acquisition time from the output _W C _(t i)), an auxiliary output at acquisition point _(W J _(t i)) This is an auxiliary output calculation formula that stipulates that the value obtained by the addition is used as an auxiliary output at a time point after a predetermined time.

When the required output changes during the transition, the control unit according to the present embodiment changes the index correction coefficient Cz based on the change mode of the required output during the transition, so that (α _C (t _i ) The value of + Cz) (that is, the value of the index) is corrected based on the change mode of the required output.

Specifically, the control unit sets the initial value of the index correction coefficient Cz to zero. When the change mode of the required output during the transition is the first change mode and the second change mode, the control unit adopts a negative value as the value of the index correction coefficient Cz, so that the index value (α _C (T _i ) + Cz) is corrected to a smaller value compared to before the change in the required output. Further, when the change mode of the required output during the transition is the third change mode or the fourth change mode, the control unit adopts a positive value as the index correction coefficient Cz, so that the index value (α _C (t _i ) + Cz) is corrected to a larger value than before the change in the required output.

  The reason for changing the index value as described above is as follows. First, in the case of the first change mode and the second change mode, the auxiliary output at the time after the actual predetermined time is earlier than the auxiliary output at the time after the predetermined time estimated using a constant as an index. It is considered that it approaches the target value (auxiliary output after stabilization). In other words, in an easy-to-understand manner, in the case of the first change mode and the second change mode, it is considered that the auxiliary output at the time point after the actual predetermined time approaches the target value earlier than initially assumed. Therefore, the control unit corrects the value of the index to a small value, thereby reducing the error between the auxiliary output at the estimated time after the predetermined time and the auxiliary output at the actual time after the predetermined time.

  On the other hand, in the third change mode and the fourth change mode, the auxiliary output at the time after the actual predetermined time is slower than the auxiliary output at the time after the predetermined time estimated using a constant as an index. It is considered that it approaches the target value (auxiliary output after stabilization). In other words, in the case of the third change mode and the fourth change mode, it is considered that the auxiliary output at the time point after the actual predetermined time approaches the target value later than originally assumed. The reason for this is that, in the case of the third change mode, when the required output changes from a state where the required output increases with the passage of time to a state where it decreases with the passage of time, the transient transition in the increasing direction works in advance. This is because it is considered that the transitional transition of this occurs with a delay. In the case of the fourth change mode, when the required output changes from a state where the required output decreases with the passage of time to a state where it increases with the passage of time, the transitional transition in the decreasing direction works in advance. This is because it is considered that this occurs with a delay. Therefore, in the case of the third change mode and the fourth change mode, the control unit corrects the value of the index to a large value so that the auxiliary output after the estimated predetermined time and the auxiliary output at the time after the actual predetermined time are The error is reduced. For the above reasons, the control unit changes the index value as described above.

  Note that the control unit according to the present embodiment acquires the index correction coefficient Cz by extracting it from the map. FIG. 4 is a diagram illustrating an example of an index correction coefficient map. In FIG. 4, the index correction coefficient is defined in association with the change mode of the required output. Specifically, the horizontal axis of FIG. 4 indicates the amount of change in requested output (requested output change amount) acquired by the control unit this time, and the vertical axis indicates the amount of change in requested output previously acquired by the control unit. In the map of FIG. 4, a reference line 310a where the value on the horizontal axis indicates zero and a reference line 310b where the value on the vertical axis indicates zero are illustrated by dotted lines.

  In FIG. 4, the region where the horizontal axis value is larger than the reference line 310a and the vertical axis value is larger than the reference line 310b is a region where the index correction coefficient (Cz) corresponding to the first change mode is defined. In the region, the index correction coefficient is set to be negative. An area where the horizontal axis value is smaller than the reference line 310a and the vertical axis value is smaller than the reference line 310b is an area where an index correction coefficient corresponding to the second change mode is defined. In this area, the index correction coefficient is It is set to negative. A region where the horizontal axis value is smaller than the reference line 310a and the vertical axis value is larger than the reference line 310b is a region where an index correction coefficient corresponding to the third change mode is defined. In this region, the index correction coefficient is It is set to positive. A region in which the value on the horizontal axis is larger than that of the reference line 310a and the value on the vertical axis is smaller than that of the reference line 310b is a region in which an index correction coefficient corresponding to the fourth change mode is defined. It is set to positive.

  Furthermore, a plurality of boundary lines are shown in the first to fourth change modes in FIG. Specifically, in the region of the first change mode in FIG. 4, boundary lines 311a to 311e are illustrated. In the region of the second change mode, the boundary line 312a to the boundary line 312e are illustrated. In the region of the third change mode, boundary lines 313a to 313e are illustrated. In the region of the fourth change mode, boundary lines 314a to 314e are illustrated.

  In the region of the first change mode in FIG. 4, the absolute value of the index correction coefficient is set larger as it goes above the boundary line 311a, and the absolute value of the index correction coefficient as it goes below the boundary line 311a. Is set small. In the region of the second change mode, the absolute value of the index correction coefficient is set to be smaller as it goes above the boundary line 312a, and the absolute value of the index correction coefficient is set to be higher as it goes below the boundary line 312a. Has been. In the region of the third change mode, the absolute value of the index correction coefficient is set larger as it goes above the boundary line 313a, and the absolute value of the index correction coefficient is set smaller as it goes below the boundary line 313a. Has been. In the region of the fourth change mode, the absolute value of the index correction coefficient is set to be smaller as it goes above the boundary line 314a, and the absolute value of the index correction coefficient is set to be higher as it goes below the boundary line 314a. Has been.

  The storage unit of the control device 200 stores the map shown in FIG. 4 in advance. The control unit acquires the required output change amount during the transition, and acquires the index correction coefficient by extracting the index correction coefficient corresponding to the acquired required output change amount from the map of the storage unit. For example, if the acquired requested output change amount is included in a region between the boundary line 311a and the boundary line 311b of the region corresponding to the first change mode, for example, the control unit Is extracted as an index correction coefficient used in equation (1).

  Next, an example of a flowchart of control performed by the control device 200 according to the present embodiment during transition will be described below. The control content of the control device 200 described above will be specifically described again in the description of the flowchart. 5, 6 and 7 are diagrams showing an example of a flowchart of control performed by the control device 200 during transition. 5 illustrates steps S10 to S80 in the flowchart, and FIG. 6 illustrates steps S90 to S120 of the flowchart. FIG. 7 shows in detail the control performed in step S120 of FIG. The control device 200 repeatedly executes the flowcharts of FIGS. 5, 6, and 7 at predetermined time intervals.

  First, the control unit of the control device 200 determines whether or not the internal combustion engine 10 is in transition (step S10). Specifically, the control unit determines whether or not it is a transitional state by determining whether or not the absolute value of the increase rate or decrease rate of the requested output is equal to or greater than a reference value. More specifically, the control unit determines the absolute value of the change amount per unit time of the accelerator opening obtained based on the detection result of the accelerator position sensor 111 (this corresponds to the absolute value of the increase speed or the decrease speed of the requested output). Is determined), and it is determined whether or not the acquired absolute value is greater than or equal to a reference value, thereby determining whether or not the current state is a transition time. In this case, the storage unit stores in advance a reference value serving as the determination criterion in step S10, and the control unit executes step S10 while referring to the reference value stored in the storage unit.

  When the absolute value of the change amount per unit time of the accelerator opening is smaller than the reference value in step S10, and it is not determined that it is in a transient state (in this case, it corresponds to a steady state), the control unit executes the flowchart. finish. If it is determined in step S10 that the absolute value of the amount of change in the accelerator opening per unit time is greater than or equal to the reference value, the control unit determines whether or not there is output assistance of the auxiliary output device 30. (Step S20). Specifically, in step S20, the control unit determines whether or not the above-described auxiliary output device operation start condition (condition that the amount of steam generated by the superheater 35 is equal to or greater than the first threshold) is satisfied. . When it is determined in step S20 that the auxiliary output device operation start condition is not satisfied and thus it is not determined that there is assistance from the auxiliary output device 30, the control unit ends the execution of the flowchart.

If it is determined in step S20 that the auxiliary output device operation start condition is satisfied and it is determined that there is assistance from the auxiliary output device 30, the control unit obtains a required output required for the internal combustion engine 10 (step S20). S30). In step S30, the control unit according to the present embodiment acquires a requested output using a map. Table 2 is a table showing an example of the map used in step S30. In Table 2, the required output (kW) is defined in association with the accelerator opening (%). Further, the required output increases as the accelerator opening increases. The numerical values in Table 2 are the image values of the accelerator opening and the required output, and it is not necessary to actually use these numerical values.

  The storage unit of the control device 200 stores a map shown in Table 2 in advance. In step S30, the control unit calculates the required output by acquiring the accelerator opening based on the detection result of the accelerator position sensor 111 and extracting the required output corresponding to the acquired accelerator opening from the map of the storage unit. To do. The control unit temporarily stores the request output obtained as a result of this calculation in the storage unit. Further, the storage unit temporarily stores the accelerator opening acquired in step S30. In step S30, the control unit obtains the change amount of the requested output based on the detection result of the accelerator position sensor 111, and temporarily stores the obtained requested output change amount in the storage unit.

Next, the control unit obtains an auxiliary output after stabilization (W _C (t _i ) in the above-described equation (1)) (step S40). Although a predetermined value (constant) can be used as the auxiliary output after stabilization, the control unit according to the present embodiment calculates the auxiliary output after stabilization using the following map.

Table 3 is an example of a first map used when calculating the stabilized auxiliary output. The auxiliary output (kW) in Table 3 is defined in association with the required output (kW) required for the internal combustion engine 10 at the steady state and after the warm-up of the internal combustion engine 10 is completed. Yes. As the required output increases, so does the auxiliary output. The numerical values in Table 3 are the image values of the required output and auxiliary output, and it is not necessary to actually use these numerical values.

Table 4 is an example of a second map used when calculating the post-stable auxiliary output. The temperature correction coefficient in Table 4 is defined in association with the refrigerant temperature (° C.) acquired based on the detection result of the temperature sensor 112. The temperature correction coefficient increases as the refrigerant temperature increases. Note that the numerical values in Table 4 are image values of the refrigerant temperature and the temperature correction coefficient, and it is not necessary to actually use these numerical values.

  The storage unit of the control device 200 stores the maps in Table 3 and Table 4 in advance. The control unit extracts the auxiliary output corresponding to the requested output acquired in step S30 from the map of Table 3, and the temperature correction coefficient corresponding to the refrigerant temperature acquired based on the detection result of the temperature sensor 112 from the map of Table 4. A value obtained by multiplying the auxiliary output extracted from Table 3 by the temperature correction coefficient extracted from Table 4 is acquired as the auxiliary output after stabilization.

  Here, in the warm-up process of the internal combustion engine 10, since the refrigerant temperature and the exhaust gas temperature are low, the temperature of the refrigerant vapor generated by the superheater 35 tends to be low. Therefore, the auxiliary output in the warm-up process tends to be lower than the auxiliary output after the warm-up is completed. Therefore, the control unit according to the present embodiment obtains a value obtained by multiplying the auxiliary output extracted from the map shown in Table 3 by the temperature correction coefficient extracted from the map shown in Table 4 as a post-stabilization auxiliary output, thereby warming up the engine. Considering the decrease in auxiliary output in the process, the stabilized auxiliary output is obtained with high accuracy.

  Next, the control unit determines whether or not the requested output has changed (step S50). Although the specific execution method of step S50 is not particularly limited, the control unit according to the present embodiment acquires the accelerator opening based on the detection result of the accelerator position sensor 111 and the acquisition in step S50. It is determined whether or not the requested output has changed by determining whether or not the accelerator opening that has been changed has changed compared to the accelerator opening acquired in step S30.

  If it is not determined in step S50 that the requested output has changed, the control unit executes step S80 described later. When it is determined in step S50 that the required output has changed, the control unit determines whether or not transient control is being performed (step S60). “Transient control is in progress” means that the control process is performed while the auxiliary output is not stable during the transition. In step S60, the control unit according to the present embodiment acquires the auxiliary output based on the detection result of the torque sensor 113, and based on the acquired auxiliary output and the post-stable auxiliary output acquired in step S40. It is determined whether or not transient control is in progress.

  Specifically, in step S60, the control unit subtracts the auxiliary output acquired based on the detection result of the torque sensor 113 from the post-stable auxiliary output acquired in step S40 (that is, the post-stable auxiliary output minus auxiliary). It is determined whether or not (output) is larger than a predetermined value. The predetermined value can be 0 or more. The storage unit of the control device 200 stores the predetermined value in advance, and the control unit executes step S60 by comparing the value obtained by subtracting the auxiliary output from the stabilized auxiliary output with the predetermined value of the storage unit.

  If it is not determined in step S60 that the value obtained by subtracting the auxiliary output from the stabilized auxiliary output is greater than the predetermined value, and thus it is not determined that the transient control is being performed, the control unit executes step S80 described later. In step S60, when it is determined that the transient control is being performed by determining that the value obtained by subtracting the auxiliary output from the stabilized auxiliary output is greater than the predetermined value, the control unit acquires an index correction coefficient (Cz) ( Step S70).

  Specifically, the control unit acquires the index correction coefficient Cz using the map described above with reference to FIG. In this case, the control unit acquires the current requested output change amount based on the detection result of the accelerator position sensor 111. Further, the control unit acquires the requested output change amount acquired in step S30 and stored in the storage unit as the previous requested output change amount. Then, the control unit extracts an index correction coefficient corresponding to the required output change amount from the map (FIG. 4) based on the current required output change amount and the previous required output change amount, and extracts the extracted index correction coefficient. Is temporarily stored in the storage unit.

  The control unit according to the present embodiment attenuates the absolute value of the index correction coefficient every time step S70 is executed. Specifically, when executing step S70 for the second and subsequent times, the control unit acquires in step S70 so that an index correction coefficient smaller than the absolute value of the index correction coefficient acquired in the previous step S70 is obtained. A value obtained by subtracting a predetermined value from the absolute value of the index correction coefficient is acquired as the index correction coefficient. More specifically, for example, when the index correction coefficient acquired when step S70 is executed for the second and subsequent X times is positive, a value obtained by subtracting a predetermined value from the index correction coefficient is used as the index correction coefficient. get. In addition, when the index correction coefficient acquired when step S70 is executed for the second and subsequent X times is negative, the control unit adds a negative sign to a value obtained by subtracting a predetermined value from the absolute value of the index correction coefficient. Things are acquired as index correction factors. As a result, every time the flowchart of FIG. 5 is executed, the absolute value of the index correction coefficient acquired in step S70 gradually decreases. By attenuating the absolute value of the index correction coefficient in this way, the effect on the estimation of the auxiliary output at the point in time after the predetermined time that the previous (previous) required output change will gradually decrease. Can do.

  After step S70, the control unit estimates an auxiliary output at a time point after a predetermined time (step S80). Specifically, the control unit estimates the auxiliary output at a time point after a predetermined time based on the above-described equation (1). In this embodiment, as the predetermined time, the repeated execution time when step S80 is repeatedly executed, that is, the time from the previous execution of step S80 to the current execution is used. However, the predetermined time is not limited to this. For example, as the predetermined time, a predetermined time selected from a multiple of the rotational speed of the CPU 201 of the control device 200 may be used, or another time may be used.

In this embodiment, the delay coefficient (α _C (t _i )) used in Expression (1) is stored in advance in the form of a map in the storage unit. Table 5 is an example of a map of delay coefficients used in this embodiment. The delay coefficient in Table 5 is defined in association with the required output. Specifically, the delay coefficient decreases as the required output increases. In this embodiment, since 1 is used as the predetermined constant A in the equation (1), the delay coefficient is a value smaller than 1. The numerical values in Table 5 are the image values of the required output and the delay coefficient, and it is not necessary to actually use these numerical values.

In step S50, the control unit obtains the delay coefficient (α _C (t _i )) corresponding to the request output obtained in step S30 by extracting it from the map of Table 5, and assists based on the detection result of the torque sensor 113. The output (W _J (t _i )) is acquired, and the after-stable auxiliary output (W _C (t _i )) acquired in step S40 and the index correction coefficient (Cz) acquired in step S70 are used to obtain the equation (1). ) To estimate the auxiliary output (W _J (t _{i + 1} )) after a predetermined time. The auxiliary output (W _J (t _{i + 1} )) at a time point after the estimated predetermined time is temporarily stored in the storage unit. Since the initial value of the index correction coefficient Cz is zero, when the flowchart of FIG. 5 is first executed, a negative determination is made in step S50 and step S80 is executed (that is, the output of the requested output in a transient state). When there is no change), the control unit calculates Equation (1) by substituting zero as the index correction coefficient Cz in Equation (1).

  After step S80, the control unit executes step S90 shown in FIG. In step S <b> 90, the control unit controls the vehicle 5. Specifically, the control unit calculates a difference between the request output acquired in step S30 and the auxiliary output at a time point after a predetermined time obtained in step S80, and the calculated output difference is calculated as the output of the internal combustion engine 10. The internal combustion engine 10 is controlled to compensate for a change (specifically, an increase in output or a decrease in output), and the transmission 20 is controlled so that the gear ratio matches the output of the internal combustion engine 10 after the output change. . Note that when the control unit controls the transmission 20 to have a gear ratio that matches the output of the internal combustion engine 10 after the output change, the control unit sets the rotation speed of the transmission 20 corresponding to the output of the internal combustion engine 10 after the output change. The transmission ratio of the transmission 20 is controlled so as to obtain the rotation speed of the transmission 20 acquired from the map (Table 1) of the storage unit.

  After step S90, the control unit determines whether or not the index correction coefficient Cz is zero (step S100). When the index correction coefficient is zero, it is considered that the state in which the auxiliary output of the auxiliary output device 30 is unstable is completed just after the required output changes during the transition. If it is not determined in step S100 that the index correction coefficient is zero, the control unit ends the execution of the flowchart.

When it is determined in step S100 that the index correction coefficient is zero, the control unit determines that the auxiliary output is the target value of the auxiliary output at the time before the predetermined time based on the auxiliary output at the time before the acquisition time. A second index (hereinafter referred to as an actual delay coefficient (α _J (t _i-1 ))) indicating how close it is to is calculated and obtained (step S110). In the present embodiment, as an example, the actual delay coefficient α _J (t _i-1 ) is acquired using an index calculation formula shown in the following formula (2).
α _J (t _i-1 ) = A-((W _J (t _i ) -W _J (t _i-1 )) / (W _C (t _i-1 ) -W _J (t _i-1 )) (2)

In Expression (2), W _J (t _i-1 ) is an auxiliary output at a time point a predetermined time before the acquisition time point, and is based on the detection result of the torque sensor 113 in the previous execution of the flowchart of FIG. Auxiliary output obtained using W _J (t _i ) is an auxiliary output at the time of acquisition, and the auxiliary output acquired based on the detection result of the torque sensor 113 when the flowchart of FIG. 5 is executed is used. W _C (t _i−1 ) is a post-stabilization auxiliary output at a time point a predetermined time before the acquisition time point, and the value acquired in step S40 at the time of the previous execution of the flowchart of FIG. 5 is used. A is a predetermined constant, and 1 is used in this embodiment. Equation (2) is stored in the storage unit, and the control unit calculates the actual delay coefficient based on equation (2) stored in the storage unit, and temporarily stores the calculated actual delay coefficient in the storage unit. Remember.

In addition, the index calculation formula according to the formula (2) indicates the auxiliary output (W _J (t _i-1 )) at a time before the acquisition time from the auxiliary output (W _J (t _i )) at the acquisition time. The subtracted value is divided by a value obtained by subtracting the auxiliary output (W _J (t _i-1 )) at a time point a predetermined time before the target value of the auxiliary output (after-stable auxiliary output W _C (t _i-1 )). The value obtained by subtracting the value obtained by subtracting from the predetermined constant (A; 1 in this embodiment) is defined as the actual delay coefficient (α _J (t _i-1 )). Yes.

In addition, since the control part which concerns on a present Example is acquiring by extracting the auxiliary output after stabilization from a map (step S40), it is after the stabilization in the time point of predetermined time as a target value of auxiliary output in Formula (2). The auxiliary output (W _C (t _i-1 )), that is, the post-stable auxiliary output acquired when the previous flowchart of FIG. 5 is executed is employed. If the control unit uses a predetermined constant as the auxiliary output after stabilization, this predetermined constant may be used in place of W _C (t _i-1 ) in Equation (2).

  After step S110, the control unit performs an abnormality determination process for acquiring a learned value and determining abnormality of the auxiliary output device 30 (step S120). This learning value is a value used by multiplying the after-stabilization auxiliary output acquired in step S40 when the next flowchart of FIG. 5 is executed. That is, the learning value has a function as a correction coefficient for correcting the target value of auxiliary output (auxiliary output after stabilization). By applying the learning value to the auxiliary output after stabilization, the auxiliary output at the time after the predetermined time acquired in step S80 is corrected by the learning value. Then, the vehicle is controlled in step S90 using the corrected auxiliary output value.

The specific processing content of step S120 is illustrated in FIG. First, the control unit determines that the absolute value of the difference between the actual delay coefficient (α _J (t _i-1 )) acquired in step S110 and the delay coefficient (α _C (t _i )) extracted from the storage unit is the first reference value. It is determined whether it is larger (step S121). Note that the delay coefficient in step S121 is acquired by the control unit extracting from the map in Table 5 of the storage unit. The value of the first reference value is not particularly limited, and is stored in advance in the storage unit.

  If it is not determined in step S121 that the absolute value of the difference between the actual delay coefficient and the delay coefficient is greater than the first reference value, the control unit ends the execution of the flowchart. On the other hand, when it is determined in step S121 that the absolute value of the difference between the actual delay coefficient and the delay coefficient is greater than the first reference value, the control unit determines whether the actual delay coefficient is greater than the delay coefficient (step S121). S122).

  When it is determined in step S122 that the actual delay coefficient is larger than the delay coefficient, the control unit changes the learning value to a smaller value (step S123). On the other hand, if it is not determined in step S122 that the actual delay coefficient is greater than the delay coefficient, the control unit changes the value of the correction coefficient to a larger value (step S124).

  Although the specific method of step S123 and step S124 is not specifically limited, the control part which concerns on a present Example is a predetermined value (henceforth correction | amendment hereafter) from the learning value before execution of step S123 in step S123 as an example. The learning value is changed to a small value by setting a value obtained by subtracting (predetermined value for use) as a new learning value. In step S124, the control unit changes the value of the learning value to a larger value by setting a value obtained by adding the correction predetermined value to the learning value before execution of step S124 as a new learning value. Thus, step S123 and step S124 are processing for updating the learning value to a new learning value.

  Further, in this embodiment, the learning value is set to take a different value depending on the amount of steam introduced into the turbine 40. As an example of this configuration, the predetermined correction value according to the present embodiment is set to take different values depending on the amount of steam introduced into the turbine 40. Specifically, a plurality of predetermined correction values are set in association with the amount of steam introduced into the turbine 40 so as to take a larger value as the amount of steam introduced into the turbine 40 increases. This will be described with a specific example. As the predetermined correction value, for example, a first predetermined correction value, a second predetermined correction value (> first predetermined correction value), a third predetermined correction value (> second). The storage unit stores three types of predetermined values for correction) in advance. The amount of steam introduced into the turbine 40 is larger in the second correction predetermined value than the first correction predetermined value, and the third correction predetermined value is introduced into the turbine 40 than the second correction predetermined value. The amount of steam generated is set large.

  In this case, in step S123, the control unit acquires the amount of steam introduced into the turbine 40, extracts a predetermined correction value corresponding to the acquired amount of steam introduced into the turbine 40 from the storage unit, and performs step S123. A value obtained by subtracting the predetermined correction value extracted from the learning value before execution of is used as a new learning value. In step S124, the control unit acquires the amount of steam introduced into the turbine 40, extracts a predetermined correction value corresponding to the amount of steam introduced into the turbine 40 from the storage unit, and learns before executing step S124. A value obtained by adding the predetermined correction value extracted to the value is set as a new learning value. After step S123 or step S124, the control unit stores the learning value obtained in step S123 or step S124 in the storage unit in association with the amount of steam introduced into the turbine 40 (step S125). As described above, the control unit classifies and stores the learning values in a state associated with the steam amount.

  Note that the learning value before execution of step S122 is set to 1.0 before the flowchart of FIG. 7 is first executed (that is, the initial value of the learning value is 1.0). By the control processing in step S123 and step S124, the learning value is changed to a smaller value as the actual delay coefficient is larger than the delay coefficient (step S123), and conversely, as the actual delay coefficient is smaller than the delay coefficient. The value is changed to a large value (step S124).

  Here, the fact that the actual delay coefficient becomes large means that the speed of increase or decrease of the output of the auxiliary output device 30 at the time of transition is slow, which indicates the possibility that the absolute value of the auxiliary output after stabilization may decrease. ing. On the contrary, the fact that the actual delay coefficient is small means that the speed of increase or decrease of the output of the auxiliary output device 30 at the time of transition is fast, and this indicates the possibility that the absolute value of the auxiliary output after stabilization may increase. ing. Since the learning value according to the present embodiment is used by multiplying the auxiliary output after stabilization, when the actual delay coefficient is large (in this case, the learning value is small), it is used when the flowchart of FIG. 5 is executed next time. The value of the auxiliary output after stabilization becomes small. As a result, the value of the calculated actual delay coefficient is also reduced, so that the actual delay coefficient gradually approaches the delay coefficient of the storage unit (map value in Table 5), and the actual delay coefficient and the delay coefficient of the storage unit This is repeated until the absolute value of the difference between and becomes the first reference value (step S121).

  On the other hand, when the actual delay coefficient is smaller than the delay coefficient of the storage unit (in this case, the learning value becomes larger), the value of the post-stabilization auxiliary output used at the next execution of the flowchart of FIG. 5 becomes larger. As a result, since the value of the calculated actual delay coefficient also increases, the actual delay coefficient gradually approaches the delay coefficient of the storage unit (map value in Table 5), and the actual delay coefficient and the delay coefficient of the storage unit This is repeated until the absolute value of the difference between and becomes the first reference value (step S121).

  After step S125, the control unit determines whether or not the learning value stored in the storage unit in step S125 is smaller than the second reference value (step S126). In the present embodiment, since there are a plurality of learning values stored in the storage unit in step S125 according to the amount of steam introduced into the turbine 40, in step S126, the control unit is the smallest of all learning values in the storage unit. It is determined whether or not the learning value is smaller than the second reference value.

  When it is determined in step S126 that the learning value is smaller than the second reference value, the control unit determines that there is an abnormality in the auxiliary output device 30 (step S127). On the other hand, when it is not determined in step S126 that the learning value is smaller than the second reference value, the control unit ends the flowchart.

  The specific value of the second reference value is not particularly limited, and is stored in advance in the storage unit. The meaning of steps S126 and S127 will be conceptually described. First, when it is determined in step S126 that the learning value is smaller than the second reference value, the increase rate of the output of the auxiliary output device 30 at the time of transition or This means that the rate of decrease has become significantly slower. In this case, since it is considered that some abnormality has occurred in the auxiliary output device 30, the control unit determines in step S127 that there is an abnormality in the auxiliary output device 30. As described above, the abnormality determination process according to the present embodiment is performed.

  In addition, it is preferable that the vehicle 5 is provided with the alerting | reporting apparatus which alert | reports abnormality to the user of the vehicle 5 (specifically the passenger | crew of the vehicle 5 including a driver | operator). When the vehicle 5 includes the notification device, the control unit controls the notification device so as to further notify the user of the abnormality in step S127. As the notification device, a lamp that notifies the user of an abnormality by lighting or blinking light, a speaker that notifies the user of an abnormality by sound, and the like can be used.

  When the control unit executes the flowchart of FIG. 5 next time, the control unit acquires the steam amount introduced into the turbine 40 in step S40 and the learning value corresponding to the acquired steam amount (this is step S125 of FIG. 7). Is stored in the storage unit) from the storage unit. The control unit acquires the post-stable auxiliary output based on the maps of Tables 3 and 4, and obtains a new post-stable auxiliary output obtained by multiplying the acquired post-stable auxiliary output by the extracted learning value. Is stored in the storage unit.

  In step S80, the control unit estimates an auxiliary output at a time point after a predetermined time by using the corrected auxiliary output after stabilization obtained in step S40. As a result, the auxiliary output at the time after the predetermined time is corrected based on the amount of steam introduced into the turbine 40. In step S90 of FIG. 6, the control unit controls the vehicle 5 based on the auxiliary output at the time after the predetermined time after correction.

  That is, when the absolute value of the difference between the actual delay coefficient and the delay coefficient is larger than the first reference value during the transition (step S121 in FIG. 7), the control unit according to the present embodiment Auxiliary output at a time point after a predetermined time by multiplying a target value of the auxiliary output used in the estimation of the auxiliary output (in this embodiment, the stabilized auxiliary output is used) by a predetermined learning value (correction coefficient). Is corrected (steps S40 and S80 in FIG. 5). Further, the learning value is set to take a different value depending on the amount of steam introduced into the turbine 40 (step S125 in FIG. 7). As a result, the control unit acquires the amount of steam introduced into the turbine 40, extracts a learning value corresponding to the acquired amount of steam from the storage unit, and sets the extracted learning value as a target value (after-stable auxiliary output). Is stored in the storage unit as a new target value (auxiliary output after stabilization), and the auxiliary output at a point in time after a predetermined time is estimated using the new target value, so that it is introduced into the turbine 40. The auxiliary output at the time after a predetermined time is corrected based on the amount of steam (step S80 in FIG. 5). The control unit controls the internal combustion engine 10 and the transmission 20 using the corrected auxiliary output (step S90 in FIG. 6).

  A part of the control performed during the transition described above will be conceptually described with reference to a timing chart. FIG. 8 is a diagram illustrating an example of a timing chart of control performed by the control device 200 during transition. In FIG. 8, in order from the upper side, the accelerator pedal position, the required output, the output of the auxiliary output device 30 (auxiliary output), the output of the internal combustion engine 10, the target rotational speed of the internal combustion engine 10 and the speed ratio of the transmission 20 change over time. Illustrated. Further, in the timing chart of the auxiliary output, the output of the internal combustion engine 10, the target rotational speed of the internal combustion engine 10 and the transmission ratio of the transmission 20, the solid line shows the timing chart at the transient time, and the dotted line shows the timing chart at the steady time. Yes.

  First, the accelerator opening increases rapidly at time A, and then shows a predetermined value until time B. At time B, the value is higher than the value before time A and after time A, it becomes time B. The value is lower than the value between. The required output timing chart is the same shape as the accelerator opening timing chart. According to the process of step S10 in FIG. 5, the control unit determines that the transition is in time A.

  In the auxiliary output timing chart of FIG. 8, the auxiliary output in the steady state indicated by the dotted line corresponds to the stabilized auxiliary output. The auxiliary output at the time of transition starts to rise later than the required output. The auxiliary output decreases after reaching a peak at time B and converges to the auxiliary output at steady state (after-stabilization auxiliary output).

  Here, the control process according to step S80 in FIG. 5 is conceptually described with reference to FIG. In FIG. 8, point a, point b, point c, and point d are shown. When the flowchart of FIG. 5 is first executed, the auxiliary output at point b is estimated based on the auxiliary output at point a in the control process according to step S80. Next, when the flowchart of FIG. 5 is executed, the auxiliary output at the point c is estimated based on the auxiliary output at the point b in the control processing according to step S80. Next, when the flowchart of FIG. 5 is executed, the auxiliary output at the point d is estimated based on the auxiliary output at the point c. Such control processing is repeated until the estimated auxiliary output becomes the auxiliary output after stabilization.

  As described above, by estimating the auxiliary output at the time point after the predetermined time using the equation (1) in step S80, the calculation of the auxiliary output at the time point after the predetermined time is prevented from diverging, and after the predetermined time. The auxiliary output at the time point can be estimated by calculation.

  The control process according to step S90 in FIG. 6 will be conceptually described with reference to FIG. When the required output increases at time A, the increase in the auxiliary output starts to increase with a delay, but the output of the internal combustion engine 10 and the target rotational speed are at time A so as to compensate for the difference between the required output and the auxiliary output. The transmission 20 is also controlled so as to increase rapidly and achieve a gear ratio that matches the output of the internal combustion engine 10.

  Then, the effect of the control apparatus 200 which concerns on a present Example is demonstrated. First, the control unit of the control device 200 acquires the auxiliary output during the transition, and the target value of the auxiliary output at a time after a predetermined time from the acquisition time when the acquired auxiliary output acquires the auxiliary output. An auxiliary output at a point in time after a predetermined time is estimated using an index indicating how close to the predetermined time, and a difference between the required output and the estimated auxiliary output at a point in time after the predetermined time is determined by a change in the output of the internal combustion engine 10. The internal combustion engine 10 is controlled so as to compensate, and the transmission 20 is controlled so that the gear ratio of the transmission 20 matches the output of the internal combustion engine 10 after the output has changed. Further, the control unit corrects the index based on the change mode of the required output when the required output changes during the transition.

  According to the control device 200, the auxiliary output at a time after a predetermined time from the time at which the auxiliary output is acquired is estimated during the transition, and the required output required for the internal combustion engine 10 and the auxiliary output at the time after the predetermined time are obtained. Can be compensated for by the change in the output of the internal combustion engine 10, and the gear ratio of the transmission 20 can be made to match the output of the internal combustion engine 10 after the output has changed. In addition, when the required output changes during the transition, the change in the required output during the transient is performed by correcting the index used for estimating the auxiliary output at the time after a predetermined time based on the change mode of the required output. Corresponding to the above, it is possible to estimate the auxiliary output at a time point after a predetermined time. As a result, the internal combustion engine 10 and the transmission 20 can be controlled in response to changes in the required output during the transition. Therefore, according to the control apparatus 200, the fuel consumption of the internal combustion engine 10 at the time of transition can be improved.

  Further, according to the control device 200, as described above in Expression (1), the control unit obtains the value obtained by subtracting the index from the predetermined constant by the value obtained by subtracting the auxiliary output at the time of acquisition from the target value. Since the auxiliary output at the time after the predetermined time is estimated by adding the auxiliary output at the time of acquisition to the obtained value, the auxiliary output at the time after the predetermined time is estimated. The auxiliary output at the time after the predetermined time can be estimated by the calculation while preventing the calculation of the auxiliary output at the time after the time from diverging.

  In addition, in the case of the first change mode and the second change mode, the control unit of the control device 200 corrects the value of the index to a smaller value than before the change of the required output, and the third change mode and the fourth change mode. In the case of the aspect, the value of the index is corrected to a large value by comparison before the change in the required output. In the case of the first change mode and the second change mode, the auxiliary output at the time after the actual predetermined time is an auxiliary output that is an estimation result when the auxiliary output at the time after the predetermined time is estimated using a constant as an index. Compared to the above, it is considered that the target value approaches the target value sooner. In the case of the first change mode and the second change mode, the control unit corrects the value of the index to a small value. Thus, the error between the auxiliary output at the point of time and the auxiliary output at the point of time after the actual predetermined time can be reduced. On the other hand, in the case of the third change mode and the fourth change mode, the auxiliary output at the time after the actual predetermined time is an estimation result when the auxiliary output at the time after the predetermined time is estimated using a constant as an index. The control unit is considered to approach the target value later than the auxiliary output. In the case of the third change mode and the fourth change mode, the control unit corrects the value of the index to a large value. The error between the auxiliary output at the time point after the time and the auxiliary output at the time point after the actual predetermined time can be reduced. Therefore, according to this configuration, it is possible to improve the estimation accuracy of the auxiliary output at a time point after a predetermined time. As a result, the internal combustion engine 10 and the transmission 20 can be controlled based on the auxiliary output at a time point after a predetermined time with high estimation accuracy, so that the fuel efficiency of the internal combustion engine 10 at the time of transition can be appropriately improved.

  Here, it is considered that when the aging of the auxiliary output device 30 occurs, the output characteristics of the auxiliary output device 30 change. For example, when a secular change occurs, it is conceivable that the increase rate or decrease rate of the output of the auxiliary output device 30 decreases or increases compared to the initial value. As a result, it is considered that the absolute value of the difference between the actual delay coefficient calculated based on the auxiliary output at a time point a predetermined time before the acquisition time point and the delay coefficient stored in the storage unit in advance becomes large. In such a case, when the auxiliary output at the time after the predetermined time estimated by the equation (1) is used for controlling the transmission 20 without correction, an appropriate change considering the secular change of the auxiliary output device 30 is taken into account. As a result of the transmission 20 not being controlled, there is a risk that the fuel efficiency will deteriorate.

  On the other hand, according to the control device 200, as described in FIG. 7, when the absolute value of the difference between the calculated actual delay coefficient and the delay coefficient stored in the storage unit in advance is larger than the predetermined value, the predetermined time is reached. Since the auxiliary output at a later time is corrected, even if the aging has occurred in the auxiliary output device 30, as a result of the aging, the calculated actual delay coefficient and the delay coefficient of the storage unit When the absolute value of the difference between the two becomes larger than the predetermined value, the auxiliary output at the time after the predetermined time can be corrected. Thereby, the transmission 20 can be appropriately controlled in consideration of the secular change of the auxiliary output device 30. As a result, it is possible to suppress deterioration in fuel consumption associated with aging of the auxiliary output device 30.

  In addition, the vehicle 5 to which the control device 200 is applied has, as the auxiliary output device 30, a turbine 40 (expander) that is driven by introduction of steam generated by waste heat of the internal combustion engine 10, and an output of the turbine 40. An auxiliary output device including an output transmission device (specifically, an electromagnetic clutch 50, a turbine pulley 60, a belt 65, and a crank pulley 16) that transmits to the internal combustion engine 10 is used. In this case, although the auxiliary output changes according to the amount of steam introduced into the turbine 40, according to the control device 200, the control unit at a time point after a predetermined time based on the amount of steam introduced into the turbine 40. Since the auxiliary output is corrected, the auxiliary output at a time point after a predetermined time can be corrected with high accuracy. Further, according to the control device 200, the control unit determines whether there is an abnormality in the auxiliary output device 30 based on the comparison result between the learned value and the second reference value. It is possible to determine whether there is an abnormality.

  Note that the control unit according to the present embodiment corrects the auxiliary output at the time after a predetermined time by correcting the value of the auxiliary output after stabilization using the learning value, and thereby the secular change of the auxiliary output device 30 is corrected. Although the control of the transmission 20 is performed in consideration, the correction is limited to the correction of the value of the auxiliary output after stabilization if the transmission 20 can be controlled in consideration of the secular change of the auxiliary output device 30. is not. The correction may be performed at any stage of processing from step S30 to step S90.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. It can be changed.

DESCRIPTION OF SYMBOLS 5 Vehicle 10 Internal combustion engine 20 Transmission 30 Auxiliary output device 35 Superheater 40 Turbine 50 Electromagnetic clutch 60 Turbine pulley 65 Belt 70 Condenser 80 Fluid passage 85 Bypass passage 200 Control device

Claims (3)

A control device applied to a vehicle including an internal combustion engine, a transmission connected to the internal combustion engine, and an auxiliary output device that assists the output of the internal combustion engine by driving using waste heat of the internal combustion engine. And
During the transition in which the absolute value of the increase rate or decrease rate of the required output that is the output required for the internal combustion engine is greater than or equal to a reference value, the auxiliary output that is the output of the auxiliary output device is acquired, and the acquired The auxiliary output at the time after the predetermined time using an index indicating how close to the target value of the auxiliary output at the time after the predetermined time from the acquisition time when the auxiliary output has acquired the auxiliary output. And controlling the internal combustion engine to compensate for the difference between the required output and the auxiliary output at the time after the predetermined time by a change in the output of the internal combustion engine, and the internal combustion engine after the output has changed A control unit that controls the transmission so that the transmission gear ratio matches the output of the transmission;
The control unit further corrects the index based on a change mode of the required output when the required output changes during the transition.   The control unit multiplies the auxiliary output at the acquisition time by a value obtained by multiplying a value obtained by subtracting the index from a predetermined constant by a value obtained by subtracting the auxiliary output at the acquisition time from the target value. The vehicle control device according to claim 1, wherein the auxiliary output at the time after the predetermined time is estimated by using the value obtained by addition as the auxiliary output at the time after the predetermined time. The control unit, when the required output changes during the transition, the change mode of the required output, the change of the required output before the change of the required output, even after the change of the required output In the case of the first change mode in which the request output increases with the passage of time, or before the change of the request output, the request output decreases with the passage of time, and the request output has elapsed even after the change of the request output. In the case of the second change mode that decreases with the correction, the value of the index is corrected to a smaller value compared with the change of the required output,
When the required output changes during the transition, the change mode of the required output is such that the required output increases as time passes before the required output changes, and the required output becomes In the case of the third change mode that decreases with time, or the fourth change mode in which the request output decreases with the passage of time before the change of the request output and the request output increases with the passage of time after the change of the request output. In this case, the control value of the vehicle according to claim 1 or 2, wherein the value of the index is corrected to a larger value compared to before the change of the required output.

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