JP4075189B2 - Power output device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent oil as the driving source of a transmission from becoming high temperature and the temperature rise of an electric motor. SOLUTION: This power output device 20 is provided with a motor 40 disposed very close to a torque converter 50. When the temperature of oil as the driving source of a transmission 60 reaches a specified temperature or higher, an electric oil pump 72 is driven to feed the oil to a cooling circuit 77 connected to a radiator 35 to cool the oil. At this time, an electric fan 37 is drive by running an engine 30 to increase the cooling effect of the radiator 35. After the oil is cooled, the torque converter 50 housed in the same housing of the transmission 60 is also cooled, and the motor 40 disposed close to this is cooled. Thus, the high temperature of the oil is prevented, and also the temperature rise of the motor 40 is prevented.

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power output device, and more particularly to a power output device including an internal combustion engine and an electric motor.
[0002]
[Prior art]
Conventionally, as this type of power output device, an electric motor is attached between the internal combustion engine and the torque converter to an existing power output device that transmits the power output from the internal combustion engine to the drive shaft via the torque converter and the transmission. There have been proposed ones constructed by attaching a motor between the torque converter and the transmission, and ones constructed by directly attaching the motor to the drive shaft at the rear stage of the transmission. These apparatuses are intended to reduce the development cost and the manufacturing cost by using the unit of the existing power output apparatus as much as possible while aiming at the effective use of energy.
[0003]
[Problems to be solved by the invention]
However, each of these power output devices has the following problems. The configuration in which the electric motor is attached between the torque converter and the transmission has a problem that the existing unit cannot be used because the torque converter and the transmission are separated from each other. In other words, in the existing unit, since the hydraulic system that drives the clutch of the torque converter needs to be integrated with the hydraulic system that drives the clutch of the transmission, etc., the torque converter and the transmission are configured integrally. is there. In addition, in the configuration in which the electric motor is directly attached to the drive shaft, an existing unit can be used. However, considering the case where the drive shaft is driven only by the power output from the electric motor, the motor is driven at low rotation and high torque to high rotation and low. There is a problem that the operation up to the torque is required, and the electric motor becomes larger and the cost required for the electric motor increases. Such a problem does not occur in the configuration in which the electric motor is mounted between the internal combustion engine and the torque converter. However, since the electric motor is adjacent to the torque converter, the temperature of the electric motor is likely to rise, and the electric motor cannot function sufficiently. There was a problem.
[0004]
In order to prevent an increase in the temperature of the motor, there are also proposed ones that cool the motor with lubricating oil or oil as a transmission drive source (Japanese Patent Laid-Open Nos. 5-310048 and 6-38303). However, a cooling pipe for this purpose is required, and an existing unit cannot be used, and a device such as a pump is required.
[0005]
The power output device of the present invention has an object to prevent the temperature of the motor from rising. Another object of the power output apparatus of the present invention is to prevent deterioration due to the working fluid of a fluid power transmission means such as a torque converter becoming hot.
[0006]
[Means for solving the problems and their functions and effects]
The power output apparatus of the present invention employs the following means in order to achieve at least a part of the above object.
[0007]
The power output apparatus of the present invention is
An internal combustion engine that outputs power to the output shaft;
Fluid power transmission means for transmitting the power of the output shaft by fluid;
An electric motor disposed on the output shaft adjacent to the fluid power transmission means, and for outputting power to the output shaft;
Operation control means for controlling the operation of the internal combustion engine and the operation of the electric motor based on the power required for the drive shaft and the drive state of the drive shaft;
A power output device comprising:
Heat exchange means capable of cooling the fluid;
A fluid pumping means for pumping the fluid to the fluid power transmission means and pumping the fluid to the heat exchanging means;
Fluid temperature detection means for detecting the temperature of the fluid;
Fluid pumping control means for controlling the operation of the fluid pumping means based on the detected temperature of the fluid;
It is a summary to provide.
[0008]
In this power output apparatus of the present invention, the fluid pressure control means controls the operation of the fluid pressure means based on the temperature of the fluid used in the fluid type power transmission means, thereby controlling the cooling of the fluid heat exchange means. And the temperature of the fluid can be controlled. As a result, overheating of the fluid can be prevented. Here, controlling the temperature of the fluid used in the fluid-type power transmission means corresponds to controlling the temperature of the electric motor disposed adjacent to the fluid-type power transmission means to some extent, and thus prevents overheating of the motor. can do.
[0009]
In such a power output apparatus of the present invention, the fluid pressure control means may be means for driving the fluid pressure supply means when the detected temperature of the fluid is equal to or higher than a predetermined temperature. In this way, the fluid can be prevented from reaching a temperature much higher than a predetermined temperature. In this aspect of the power output apparatus of the present invention, the fluid pressure control means is configured such that even if the detected fluid temperature is less than the predetermined temperature, the rate of change of the detected fluid temperature is not less than the predetermined rate of change. In some cases, it may be a means for driving the fluid pumping means. By doing so, it is possible to cope with a sudden rise in the temperature of the fluid.
[0010]
In the power output apparatus of the present invention, the fluid pressure control means is a means for increasing the flow rate of the fluid pressure-fed to the heat exchange means when the detected temperature of the fluid is equal to or higher than a predetermined temperature. It can also be. In this way, the fluid can be prevented from reaching a temperature much higher than a predetermined temperature. In this aspect of the power output apparatus of the present invention, the fluid pressure control means is configured such that even if the detected fluid temperature is less than the predetermined temperature, the rate of change of the detected fluid temperature is not less than the predetermined rate of change. In some cases, the flow rate of the fluid pumped to the heat exchanging means may be increased. By doing so, it is possible to cope with a sudden rise in the temperature of the fluid.
[0011]
In the power output apparatus of the present invention that drives the fluid pumping means or increases the flow rate of the fluid pumped to the heat exchanger when the temperature of these fluids is equal to or higher than a predetermined temperature, the heat exchange means includes the internal combustion engine A means for cooling the cooling water as well as means for providing a cooling fan that operates in accordance with the operation of the internal combustion engine, wherein the fluid pressure control means has a temperature of the detected fluid equal to or higher than the predetermined temperature. Sometimes, the operation control means can be restricted so as to prohibit the stop of the operation of the internal combustion engine. If it carries out like this, the fan for cooling of a heat exchange means can cool a fluid at an early stage by a drive, and it can control the temperature rise of a fluid type power transmission means and an electric motor. In this aspect of the power output apparatus of the present invention, the fluid pressure control means is configured such that even if the detected fluid temperature is less than the predetermined temperature, the rate of change of the detected fluid temperature is not less than the predetermined rate of change. In some cases, the operation control means may be restricted so as to prohibit the stop of the operation of the internal combustion engine. By doing so, it is possible to cope with a sudden rise in the temperature of the fluid.
[0012]
In the power output apparatus of the present invention in which such heat exchange means is also means for cooling the internal combustion engine, determination means for determining whether the fluid temperature detection means is operating normally, and the fluid temperature detection means by the determination means When it is determined that the engine is not operating normally, an operation restricting means for restricting the operation control means to prohibit the stop of the operation of the internal combustion engine may be provided. By so doing, even when the fluid temperature detecting means is not normal, the cooling fan of the heat exchange means is always driven, so that an increase in the temperature of the fluid can be suppressed.
[0013]
In the power output apparatus of the present invention, in place of or in addition to the fluid temperature detecting means, the motor output temperature detecting means for detecting the temperature of the electric motor is provided, and the fluid pressure control means is a fluid detected by the fluid temperature detecting means. Instead of or in addition to the above temperature, it may be a means for controlling the fluid pressurizing and pumping means based on the temperature of the electric motor detected by the electric motor temperature detecting means. In this way, the temperature of the fluid can be controlled based on the temperature of the electric motor.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described based on examples. FIG. 1 is a configuration diagram schematically showing a schematic configuration when a power output apparatus 20 according to an embodiment of the present invention is mounted on a vehicle. As shown in the figure, the power output apparatus 20 of the embodiment is roughly an engine 30 that is an internal combustion engine that outputs power to a crankshaft 32, and a rotation that is an output shaft coupled to the crankshaft 32 via a damper 31. A motor 40 that is an electric motor that outputs power to the shaft 33, a torque converter 50 that amplifies torque by the action of a fluid, a transmission 60 that decelerates or increases the rotational speed at a predetermined speed ratio, and controls the entire apparatus. And a hybrid electronic control unit (hereinafter referred to as HVECU) 80.
[0015]
The engine 30 is an internal combustion engine that outputs power using gasoline as fuel, and its operation is controlled by an engine electronic control unit (hereinafter referred to as EGECU) 38. The operation control of the engine 30 by the EGECU 38 is performed by controlling the opening of a throttle valve (not shown) and the opening time of a fuel injection valve (not shown), but details thereof are omitted. The cooling water of the engine 30 passes through the cooling water passage 36 and is cooled by the radiator 35. An electric fan 37 is attached to the radiator 35, and the drive motor 37 a of the electric fan 37 is driven and controlled by the EGECU 38 so as to be driven as the engine 30 is operated.
[0016]
The motor 40 is configured as a synchronous motor generator, and includes a rotor 42 having a plurality of permanent magnets 43 on the outer peripheral surface, and a stator 44 around which a three-phase coil 45 that forms a rotating magnetic field is wound. The operation of the motor 40 is controlled by a motor electronic control unit (hereinafter referred to as MGECU) 46 having an inverter circuit (not shown) therein. The operation control of the motor 40 by the MGECU 46 is performed by sequentially controlling the ON time ratio of each transistor of the inverter circuit connected to the battery 48 to control the current flowing through each coil of the three-phase coil 45. In the embodiment, since the motor 40 is a synchronous motor generator, the battery 48 can be charged by operating the motor 40 as a generator during braking or driving by the engine 30. The MGECU 46 also controls the motor 40 to operate as a generator.
[0017]
The torque converter 50 is a well-known fluid-type torque converter that amplifies torque by the action of circulating oil and transmits the amplified torque to the rear, and a turbine impeller 52 connected to the crankshaft 32 and a turbine liner connected to the transmission 60. 54 and a stator 58 connected to the fixed portion via a one-way clutch 56. The shaft portion of the pump impeller 52 extends, and a mechanical oil pump 70 is attached thereto. A detailed description of the mechanical oil pump 70 will be described later.
[0018]
The transmission 60 has an input shaft connected to the output shaft of the torque converter 50, and decelerates or increases the rotational speed at a predetermined gear ratio. Further, the output shaft of the transmission 60 is connected to a drive shaft 66, and the drive shaft 66 is connected to drive wheels 68 and 69 via a differential gear 67. The transmission 60 of the present embodiment is configured to have five forward speeds and one reverse speed. Specifically, the transmission 60 includes a planetary gear mechanism 62 including a plurality of planetary gears and clutches and brakes, and clutches C1 and C2 that switch forward and backward movement of the vehicle and intermittently transmit and receive power. Here, when the vehicle is advanced, the clutch C1 is engaged and the clutch C2 is disengaged. Conversely, when the vehicle is moved backward, the clutch C1 is disengaged and the clutch C2 is engaged. During neutral or parking, the power transmission is cut off by disengaging the clutches C1 and C2. Since the detailed description of the planetary gear mechanism 62 is redundant in the description of the present invention, the description thereof is omitted. The clutch and brake (not shown) of the planetary gear mechanism 62 and the clutches C1 and C2 operate using hydraulic pressure as a power source, and the action of the hydraulic pressure is performed by opening and closing a solenoid valve (not shown). Such solenoid valve opening / closing control is performed by an automatic transmission electronic control unit (hereinafter referred to as ATECU) 64. The hydraulic pressure is ensured by driving the mechanical oil pump 70 described above or by driving an electric oil pump 72 driven by electric power supplied from the battery 48.
[0019]
Although not shown, the mechanical oil pump 70 is configured as a gear type oil pump including a driven gear and a drive gear. Since the mechanical oil pump 70 is attached to the shaft portion of the pump impeller 52 as described above, the mechanical oil pump 70 is driven by the rotation of the crankshaft 32 regardless of the rotation of the drive shaft 66. Therefore, when the drive shaft 66 is not rotating, that is, when the vehicle is stopped, the mechanical oil pump 70 is driven if the engine 30 is operated, and the operation of the engine 30 is stopped. Sometimes it is stopped. Of course, the mechanical oil pump 70 is also driven by forcibly rotating the crankshaft 32 by the motor 40, but this drive is not preferable from the viewpoint of energy efficiency.
[0020]
The electric oil pump 72 includes a rotation speed control oil pump motor 73 as a drive means, and the discharge amount of the electric oil pump 72 can be changed by changing the rotation speed of the oil pump motor 73. The oil pump motor 73 is provided with a motor rotation speed sensor 74 for detecting the rotation speed Nm.
[0021]
The hydraulic circuit 76 connected to the discharge port of the mechanical oil pump 70 or the electric oil pump 72 is connected to the torque converter 50 or the transmission 60 so that oil is pumped to the torque converter 50 or the transmission 60. It has become. The hydraulic circuit 76 is connected to a cooling circuit 77 via a pressure regulating valve 78 that adjusts the pressure on the discharge side, and the oil is cooled by the radiator 35 by the cooling circuit 77.
[0022]
The hybrid electronic control unit (hereinafter referred to as HVECU) 80 is a unit that controls the entire power output apparatus 20. The HVECU 80 is configured as a one-chip microprocessor configured around the CPU 82, and includes a ROM 84 that stores a processing program, a RAM 86 that temporarily stores data, an input / output port (not shown), an EGECU 38, and the like. A serial communication port (not shown) for communicating with the MGECU 46 and the ATECU 64 is provided. In this HVECU 80, the rotational speed Ne of the rotating shaft 33 detected by the resolver 34 attached to the rotating shaft 33, the temperature Tm in the motor 40 from the motor temperature sensor 47 attached in the motor 40, the transmission 60 The oil temperature To detected by the oil temperature sensor 75 attached to the oil pan 71 provided side by side, the rotation speed Nm of the oil pump motor 73 detected by the motor rotation speed sensor 74, the starter switch ST from the starter switch 87, and the shift A shift position SP which is a position of the shift lever 90 detected by the position sensor 92, a brake switch BP as an on / off of the side brake lever 94 detected by the brake switch 96, and a wheel speed sensor 68a attached to the drive wheels 68 and 69. , Wheels from 69a V1, V2 and the like are input via the input port. The HVECU 80 outputs a drive signal CP to the oil pump motor 73, a drive signal CV to the pressure regulating valve 78 that adjusts the hydraulic pressure of the cooling circuit 77, a lighting signal CI to the indicator 88, and the like.
[0023]
FIG. 2 is a partial cross-sectional view showing a part of a cross section of the motor 40 and the torque converter 50 actually arranged. As shown in the drawing, a torque converter 50 is disposed in the transmission housing 63, and the motor 40 is disposed at a position very close to the torque converter 50. The transmission housing 63 is a case for storing the torque converter 50 and the transmission 60 as a unit, and the torque converter 50 and the transmission 60 unitized in the transmission housing 63 are those used in an existing gasoline vehicle. It is used as it is. The open end (left side in FIG. 2) of the transmission housing 63 is connected to an adapter 49 that connects the engine 30 and the transmission housing 63. The adapter 49 functions as a spacer for providing a space necessary for attaching the motor 40 to the rotating shaft 33 between the engine 30 and the torque converter 50, and also functions as a case for supporting the stator 44 of the motor 40. As shown in the figure, since the axial space for installing the motor 40 is small, the power output device 20 can be configured using an existing unit, and the power output device 20 is installed in an existing body (vehicle). be able to. As a result, development costs and production costs can be kept low. Since the motor 40 is disposed very close to the torque converter 50, the temperature atmosphere of the motor 40 is greatly influenced by the heat generated by the torque converter 50.
[0024]
The power output device 20 configured in this manner is based only on the power required from the drive shaft 66, the state of the drive shaft 66, the state of the battery 48, and the like output from the engine 30 by a drive control routine (not shown). An engine drive mode for driving the drive shaft 66, a motor drive mode for driving the drive shaft 66 only by power output from the motor 40, and a hybrid drive mode for driving the drive shaft 66 by power output from the engine 30 and the motor 40. The drive shaft 66 is driven in various modes such as a charge drive mode in which the drive shaft 66 is driven by the power output from the engine 30 and a part of the power output from the engine 30 is regenerated by the motor 40 to charge the battery 48. To drive. In such a drive mode, in the drive mode in which the engine 30 is operated, the mechanical oil pump 70 is driven as the engine 30 is operated, so that the operation of the electric oil pump 72 is stopped. Even in the drive mode in which the engine 30 is not operated, when power transmission to the drive wheels 66 is not necessary, no hydraulic pressure is required, and the operation of the electric oil pump 72 is stopped.
[0025]
Next, temperature control of the atmosphere of the motor 40 and temperature control of oil that is a control fluid of the transmission 60 and a working fluid of the torque converter 50 will be described. As described above, since the motor 40 is disposed very close to the torque converter 50, the temperature of the atmosphere greatly depends on the temperature of the torque converter 50. The temperature of the torque converter 50 can be controlled by cooling the oil. Therefore, in the power output apparatus 20 of the embodiment, the oil temperature control routine illustrated in FIG. 3 is executed to control the temperature of the oil so as to control the temperature of the torque converter 50 and the temperature of the atmosphere of the motor 40. This oil temperature control routine is repeatedly executed at predetermined time intervals (for example, every 10 ms).
[0026]
When the oil temperature control routine is executed, the CPU 82 first executes a process of determining whether or not the oil temperature sensor 75 is operating normally (step S100). Specifically, the signal line from the oil temperature sensor 75 is electrically checked by applying a voltage to the signal line, for example, whether the signal line is disconnected or short-circuited. When the oil temperature sensor 75 is operating normally, the oil temperature To detected by the oil temperature sensor 75 is read (step S104), and the read oil temperature To is compared with the threshold values T1 and T2 (step S106). Here, the threshold T1 is set as a temperature at which the oil needs to be cooled, and is determined by the influence of the oil temperature on the temperature of the atmosphere of the torque converter 50 and the motor 40 and the allowable temperature range of the oil. The threshold value T2 is set as a temperature at which oil cooling is stopped, and is set as a temperature lower than the threshold value T1 in order to provide hysteresis so that oil start and stop are not frequently started and stopped.
[0027]
When the oil temperature To is equal to or lower than the threshold value T2, it is determined that cooling is not necessary, and the value 0 is set in the cooling determination flag F (step S110), and normal drive control is performed according to the drive control routine (not shown) described above ( Step S112) This routine is finished. Actually, the cooling determination flag F is determined at a step in the drive control routine, and when the value is 0, the drive shaft 66 is driven and controlled using any of the drive modes described above without any restriction. To do.
[0028]
When the oil temperature To is less than the threshold value T1 but greater than the threshold value T2, the cooling determination flag F is checked (step S114). When the cooling determination flag F is 0, the above-described normal drive control is performed (step S112). End the routine.
[0029]
When the oil temperature To is equal to or higher than the threshold value T1, it is determined that the oil needs to be cooled, the value 1 is set in the cooling determination flag F (step S116), and engine drive control that does not stop the engine 30 is performed (step S118) . Actually, the cooling determination flag F is determined in a step in the drive control routine, and when the value is 1, drive control of the drive shaft 66 is performed using a drive mode other than the drive mode in which the operation of the engine 30 is stopped. To do. The reason why the operation of the engine 30 is not stopped in this way is to drive the electric fan 37 that sends cold air to the radiator 35 that is driven along with the operation of the engine 30. This is because the oil cooling circuit 77 is connected to the radiator 35 and the oil is cooled by the radiator 35 as described above. Then, the electric oil pump 72 is driven (step S120), and the pressure regulating valve 78 is driven to open to increase the line pressure of the cooling circuit 77 (step S122). By driving the electric oil pump 72 to increase the line pressure of the cooling circuit 77, the oil flows through the cooling circuit 77 and is cooled by the radiator 35. As a result, the torque converter 50 is cooled, the temperature of the atmosphere of the motor 40 is lowered, or an increase in temperature can be suppressed.
[0030]
When the oil temperature To is less than the threshold value T1 and greater than the threshold value T2 and the cooling determination flag F is a value 1, it is determined that the oil needs to be cooled in this routine started before the previous time, and steps S118 to S122 are performed. The engine drive control, the drive of the electric oil pump 72, and the process of increasing the line pressure of the cooling circuit 77 are being executed, but it is determined that the oil cooling has not been sufficiently completed, These processes (the engine drive control in steps S118 to S122, the drive of the electric oil pump 72, and the process of increasing the line pressure of the cooling circuit 77) are continued.
[0031]
If it is determined in step S102 that the oil temperature sensor 75 is abnormal, the oil temperature To cannot be detected, and the temperature of the torque converter 50 and the atmosphere of the motor 40 cannot be controlled based on the oil temperature To. As side control, oil cooling processing, that is, engine drive control in steps S118 to S122, drive of the electric oil pump 72, and line pressure increase of the cooling circuit 77 are executed. By doing so, it is possible to prevent the oil temperature To from becoming higher than the threshold value T1 or the threshold value T2.
[0032]
Next, FIG. 4 is used for the change of the oil temperature To, the driving state of the electric oil pump 72, the change of the line pressure of the cooling circuit 77, and the driving state of the electric fan 37 when the oil temperature control routine of FIG. I will explain. As shown in the figure, the electric oil pump 72 and the electric fan 37 are driven at time t1 when the oil temperature To becomes the threshold value T1. The line pressure of the cooling circuit 77 rises at time t2 slightly delayed from the drive of the electric oil pump 72. The oil temperature To increases slightly after the time t1, but gradually stops increasing and then decreases. The oil temperature To drops below the threshold value T1 at time t3, but the drive of the electric oil pump 72 and the electric fan 37 continues until time t4 when the oil temperature To falls below the threshold value T2. Thus, the oil is cooled, and the oil temperature To is set to be equal to or lower than the threshold value T2.
[0033]
According to the power output apparatus 20 of the embodiment described above, the temperature of the oil that is the working fluid of the torque converter 50 can be controlled, and early deterioration of the oil can be prevented. As a result of the oil temperature control, the temperature control of the torque converter 50 and the temperature control of the atmosphere of the motor 40 can be performed. As a result, the temperature rise of the motor 40 can be prevented, and the drive control of the drive shaft 66 by the power output from the motor 40 can be appropriately performed. The fact that the drive control of the motor 40 can be performed properly means that the drive shaft 66 can be driven by selecting a more efficient drive mode, so that the energy efficiency of the entire power output apparatus 20 can be improved. it can. In addition, since the power output apparatus 20 can be configured by adding the motor 40 to the existing unitized configuration, development costs and production costs can be kept low. Further, the operation of the oil temperature sensor 75 is checked to determine whether the oil temperature sensor 75 is abnormal. At that time, the oil is cooled, so that the oil temperature To can be controlled even when the oil temperature cannot be controlled based on the oil temperature To. The threshold value T1 or the threshold value T2 can be prevented from being higher.
[0034]
In the power output apparatus 20 of the embodiment, the oil is cooled by the radiator 35 via the cooling circuit 77, but may be cooled using a heat exchanger dedicated to oil. In the power output apparatus 20 of the embodiment, the electric fan 37 is driven as the engine 30 is operated. However, the electric fan 37 may be driven based on the temperature of the radiator 35 or a drive signal from the HVECU 80. It is good also as what drives by.
[0035]
In the power output apparatus 20 of the embodiment, the oil cooling process is performed based on the oil temperature To, but the oil cooling process is added to the oil cooling process based on the oil temperature To based on the rate of change of the oil temperature To. It may be a thing. An example of the oil temperature control routine of this modification is shown in FIG. The processing of steps S200 to S206 and the processing of steps S214 to S228 of the oil temperature control routine of FIG. 5 are the same as the processing of steps S100 to S106 and the processing of steps S108 to S122 of the oil temperature control routine of FIG. Since the description of these processes overlaps, the description thereof will be omitted, and the oil temperature control routine of FIG. 5 will be described focusing on the processes of steps S208 to S212.
[0036]
In the oil temperature control routine of FIG. 5, when the read oil temperature To is lower than the threshold value T1, the oil temperature To is compared with the threshold value T3 (step S208). The threshold value T3 is set as a temperature lower than the threshold value T1, and is set as a temperature between the threshold value T1 and the threshold value T2 in the embodiment, but may be the same temperature as the threshold value T2. When the oil temperature To is equal to or lower than the threshold value T3, the processing from step S214 is executed. When the oil temperature To is higher than the threshold value T3, the oil temperature To read when the oil temperature control routine is started last time from the oil temperature To. To calculate the deviation ΔTo (step S210). Next, the calculated deviation ΔTo is compared with a threshold value ΔTref (step S212). Here, the threshold value ΔTref is allowed when the oil temperature To is large and exceeds the threshold T1 because the change in the oil temperature To is large even when the oil temperature To is equal to or higher than the threshold T1 and the oil is cooled. And is determined based on the specific heat of the oil and torque converter 50, the frequency of starting the oil temperature control routine, the allowable temperature range of the oil, the value of the threshold T1, and the like. Is. When the deviation ΔTo is equal to or larger than the threshold value ΔTref, it is determined that the oil cooling process is necessary, the value 1 is set in the cooling determination flag F (step S222), and the oil cooling process is executed (steps S224 to S228). . On the other hand, when the deviation ΔTo is less than the threshold value ΔTref, normal processing after step S214 is performed.
[0037]
According to the power output apparatus 20 that executes the oil temperature control routine of such a modification, the oil temperature can be controlled based on the rate of change of the oil temperature To. That is, when the change rate of the oil temperature To is large, the oil cooling process is performed even if the oil temperature To does not reach the threshold value T1, so that the rapid increase in the temperature of the torque converter 50 and the rapid increase in the temperature of the atmosphere of the motor 40 can be achieved quickly. And the temperature of the atmosphere of the motor 40 can be set to an appropriate temperature range.
[0038]
In the power output apparatus 20 of the embodiment and its modification, when the oil temperature To becomes equal to or higher than the threshold value T1 or the deviation ΔTo corresponding to the rate of change becomes equal to or higher than the threshold value ΔTref, the electric oil pump 72 is simply driven. Although the oil is cooled by increasing the line pressure of the cooling circuit 77 by the pressure regulating valve 78, the electric oil pump 72 is driven and controlled so as to increase the discharge amount of the electric oil pump 72, and the line pressure of the cooling circuit 77 is controlled by the pressure regulating valve 78. It may be raised. The changed part of the oil temperature control routine in this case is shown in FIG. In the modified oil temperature control routine, the process of increasing the rotational speed Nm of the oil pump motor 73 in step S121 is performed instead of the process of step S120 in the process of the oil temperature control routine of FIG. The rotation speed Nm of the oil pump motor 73 is increased by adding a predetermined rotation speed ΔN to the normal rotation speed Nset. Since the oil pump motor 73 is a motor for controlling the rotation speed, the discharge pressure and the discharge amount can be increased by increasing the rotation speed in this way. FIG. 7 shows changes in the oil temperature To, the rotation speed Nm of the oil pump motor 73, changes in the line pressure of the cooling circuit 77, and the driving state of the electric fan 37 when the oil temperature control routine of this modification is executed. As shown in the figure, the oil pump motor 73 of the electric oil pump 72 that was rotating at the normal rotation speed Nset is rotated by a drive signal whose rotation speed is increased by ΔN at time t1 when the oil temperature To becomes the threshold value T1. The number is increased and settled to a rotational speed increased by ΔN at time t2. Along with this, the line pressure of the cooling circuit 77 also increases from the normal pressure P1 to the pressure P2. Thereafter, the oil temperature To falls below the threshold value T1 at time t3, but until the time t4 when the oil temperature To falls below the threshold value T2, the rotation speed Nm of the oil pump motor 73 is operated at a rotation speed increased by ΔN.
[0039]
According to the power output device 20 of this modification, the oil can be cooled by increasing the rotational speed Nm of the oil pump motor 73 and increasing the line pressure of the cooling circuit 77, and the temperature of the torque converter 50 and the motor 40 can be cooled. The temperature of the atmosphere can be controlled. In this modification, the amount of increase in the rotation speed Nm of the oil pump motor 73 is constant at ΔN, but may be changed based on the oil temperature To.
[0040]
In the power output apparatus 20 of the embodiment or its modification, the oil is cooled based on the oil temperature To, but the oil may be cooled based on the temperature Tm of the motor 40. In this case, the temperature Tm of the motor 40 detected by the motor temperature sensor 47 is used instead of the oil temperature To in FIGS. 3, 5, and 6, and the threshold values T <b> 1, T <b> 2, T <b> 3 are set according to the appropriate temperature range of the motor 40. You just have to decide. In this way, the oil can be directly cooled by the temperature Tm of the motor 40, so that the motor 40 can be within the appropriate temperature range, and the drive shaft 66 can be driven by selecting a more efficient drive mode. As a result, the energy efficiency of the entire power output apparatus 20 can be improved.
[0041]
In the power output apparatus 20 of the embodiment, the fluid type torque converter 50 and the stepped transmission 60 are provided. Instead, the transmission ratio can be continuously changed and a hydraulically controlled clutch is provided. A continuously variable transmission (CVT) may be provided. In the power output apparatus 20 of the embodiment, the engine 30 and the motor 40 are configured to be mounted on a hybrid vehicle that drives the vehicle. However, the driving of the vehicle by the motor 40 is not essential, and the vehicle stops. A vehicle having an automatic engine stop device that automatically stops the engine if a predetermined condition is satisfied, and automatically starts the engine and resumes operation when the predetermined condition is not satisfied You may comprise as what is mounted in. In this case, the output of the motor 40 does not need the ability to drive the vehicle, and may be the ability necessary to start the engine 30.
[0042]
In the power output apparatus 20 of the embodiment or its modification, a synchronous motor is used as the motor 40. However, any type of motor may be used as long as the motor can output power to the crankshaft 32.
[0043]
In the power output device 20 of the embodiment or its modification, the power output device 20 is mounted on a vehicle, but may be mounted on a vehicle such as a train other than a vehicle, a ship, an aircraft, or the like.
[0044]
As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment at all, Of course, in the range which does not deviate from the summary of this invention, it can implement with a various form. It is.
[Brief description of the drawings]
FIG. 1 is a configuration diagram schematically showing a schematic configuration when a power output apparatus 20 according to an embodiment of the present invention is mounted on a vehicle.
FIG. 2 is a partial cross-sectional view showing a part of a cross section of a motor 40 and a torque converter 50 that are actually arranged.
FIG. 3 is a flowchart illustrating an example of an oil temperature control routine executed by a CPU 82 provided in the HVECU 80 of the power output apparatus 20 according to the embodiment.
FIG. 4 is an explanatory diagram illustrating a change in oil temperature To, a driving state of an electric oil pump 72, a change in line pressure of a cooling circuit 77, and a driving state of an electric fan 37 when an oil temperature control routine is executed. .
FIG. 5 is a flowchart showing a modified oil temperature control routine.
FIG. 6 is a flowchart showing a part of a modified oil temperature control routine.
7 is a diagram illustrating the change in the oil temperature To, the drive state of the electric oil pump 72, the change in the line pressure of the cooling circuit 77, and the drive state of the electric fan 37 when the oil temperature control routine of FIG. 6 is executed. FIG.
[Explanation of symbols]
20 Power output device, 30 Engine, 31 Damper, 32 Crankshaft, 33 Rotating shaft, 34 Resolver, 35 Radiator, 36 Cooling water passage, 37 Electric fan, 37a Drive motor, 38 EG ECU, 40 Motor, 42 rotor, 43 Permanent magnet , 44 Stator, 45 Three-phase coil, 46 MGECU, 47 Motor temperature sensor, 48 Battery, 49 Adapter, 50 Torque converter, 52 Pump impeller, 54 Turbine liner, 56 One-way clutch, 58 Stator, 60 Transmission, 62 Planetary gear mechanism , 63 Transmission housing, 64 ATECU, 66 Drive shaft, 67 Differential gear, 68, 69 Drive wheel, 68a, 69a Wheel speed sensor, 70 Mechanical oil pump, 71 Oil pan, 72 Electric oil pump, 73 Pump motor, 74 motor speed sensor, 75 oil temperature sensor, 76 hydraulic circuit, 77 cooling circuit, 78 pressure regulating valve, 80 HVECU, 82 CPU, 84 ROM, 86 RAM, 87 starter switch, 88 indicator, 90 shift lever, 92 Shift position sensor, 94 side brake lever, 96 brake switch, C1, C2 clutch.

Claims (9)

An internal combustion engine that outputs power to the output shaft;
Fluid power transmission means for transmitting the power of the output shaft by fluid;
An electric motor disposed on the output shaft adjacent to the fluid power transmission means, and for outputting power to the output shaft;
A power output device comprising: operation control means for controlling operation of the internal combustion engine and operation of the electric motor based on power required for the drive shaft and a drive state of the drive shaft;
Heat exchange means capable of cooling the fluid;
A fluid pumping means for pumping the fluid to the fluid power transmission means and pumping the fluid to the heat exchanging means;
Fluid temperature detection means for detecting the temperature of the fluid;
Fluid pumping control means for controlling the operation of the fluid pumping means based on the detected temperature of the fluid,
The fluid pumping means includes a first fluid pumping means driven by the operation of the internal combustion engine, and a second fluid pumping means driven by a second electric motor,
The fluid pumping control unit drives the second fluid pumping unit only when the fluid temperature is equal to or higher than a predetermined value, and increases the pressure of the fluid pumped from the second fluid pumping unit to the heat exchange unit. A power output device characterized by that.   2. The power output apparatus according to claim 1, wherein the fluid pressure control means is means for driving the fluid pressure supply means when the detected temperature of the fluid is equal to or higher than a predetermined temperature.   The fluid pumping control means is means for driving the fluid pumping means when the rate of change of the detected fluid temperature is equal to or greater than a predetermined change rate even if the detected fluid temperature is less than the predetermined temperature. The power output apparatus according to claim 2.   2. The power output apparatus according to claim 1, wherein the fluid pressure control unit is a unit that increases a flow rate of the fluid pressure-fed to the heat exchange unit when a temperature of the detected fluid is equal to or higher than a predetermined temperature.   The fluid pumping control means is pumped to the heat exchanging means when the rate of change of the detected fluid temperature is not less than a predetermined rate of change even if the temperature of the detected fluid is less than the predetermined temperature. The power output apparatus according to claim 4, which is a means for increasing the flow rate of the fluid. The power output device according to claim 2 or 4,
The heat exchange means is means for cooling the cooling water of the internal combustion engine, and means for providing a cooling fan that operates in accordance with the operation of the internal combustion engine.
The fluid pressure control unit is a unit that regulates the operation control unit to prohibit the operation of the internal combustion engine from being stopped when the detected temperature of the fluid is equal to or higher than the predetermined temperature.   The fluid pressure control means prohibits the operation of the internal combustion engine from stopping when the detected fluid temperature is lower than the predetermined temperature and the detected fluid temperature change rate is equal to or higher than the predetermined change rate. The power output apparatus according to claim 6, wherein the power output device is a means for regulating the operation control means. The power output device according to claim 6 or 7,
Determination means for determining whether the fluid temperature detection means is operating normally;
A power output device comprising: an operation restricting means for restricting the operation control means to prohibit the stop of the operation of the internal combustion engine when the determining means determines that the fluid temperature detecting means is not operating normally. The power output device according to any one of claims 1 to 8,
In addition to or in addition to the fluid temperature detection means, comprising an electric motor temperature detection means for detecting the temperature of the electric motor,
The fluid pressure control means is means for controlling the fluid pressure control means based on the temperature of the electric motor detected by the electric motor temperature detection means instead of or in addition to the temperature of the fluid detected by the fluid temperature detection means. Power output device.

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