JP5713814B2 - Hybrid vehicle - Google Patents

Description

  The present invention relates to a hybrid vehicle that shifts the driving force of an engine and a motor by a transmission and transmits the driving force to driving wheels, and switches the transmission state of the driving force according to the connection and disconnection of a hydraulic clutch. The present invention also relates to a technique for controlling the supply of oil used for connecting and disconnecting a hydraulic clutch.

In recent years, hybrid vehicles have begun to spread in place of automobiles that use a gasoline engine or the like as a driving power source.
In this type of hybrid electric vehicle, a driving motor is driven by the generated electric power while a generator is driven by an engine to charge a battery. For example, in a parallel hybrid vehicle, an engine running using only the engine as a driving source, a motor running using only the motor as a driving source, an engine and a motor depending on the connection / disconnection of a hydraulic clutch interposed between the engine and the motor. The engine / motor combined travel as a drive source can be arbitrarily switched (for example, see Patent Document 1).
In a hybrid vehicle as well as a general vehicle, there is a demand for downsizing of a drive system in order to expand a cabin space and a cargo space. Therefore, in the technique of Patent Document 1, the hydraulic clutch, the motor, the transmission, and the like are accommodated in the same casing, and the oil used for cooling the motor and the connecting / disconnecting operation of the hydraulic clutch is shared. The oil pump and hydraulic circuit are shared to reduce the size of the drive system.

Japanese Patent Application Laid-Open No. 07-76229

In the technique described in Patent Document 1, a plurality of devices that share oil may operate at the same time. Even in such a situation, it is necessary to supply oil to each device without any shortage so that the device can operate smoothly. is there. For example, the oil supply to the motor is always performed from the viewpoint that motor cooling is always necessary, but when the hydraulic clutch is connected and disconnected, the oil supply amount required for clutch operation is the oil supply amount to the motor. Is added.
In general, the hydraulic clutch is either disconnected or connected by supplying oil, and returns to the original connected state by the urging force of the built-in return spring. Sometimes, a considerable amount of oil is consumed to operate the clutch by an amount corresponding to the connecting / disconnecting stroke. Therefore, in this case, it is assumed that the motor cooling and the connecting / disconnecting operation of the hydraulic clutch are performed simultaneously, and it is necessary to greatly increase the capacity of the oil pump in order to enable oil supply to both devices. .

However, an increase in the capacity of the oil pump leads to an increase in drive loss. For example, in a configuration in which the oil pump is driven by an engine, an increase in the drive loss of the engine and, consequently, an adverse effect such as a deterioration in fuel consumption.
The present invention has been made to solve such problems, and the object of the present invention is to make it possible to perform motor cooling and connecting / disconnecting operation of a hydraulic clutch without any trouble without shortage of oil supply. Accordingly, it is an object of the present invention to provide a hybrid vehicle that can prevent an adverse effect such as a deterioration in fuel consumption due to an increase in capacity of an oil pump for supplying oil.

In order to achieve the above object, the invention of claim 1 shifts the driving force of the engine and the motor by the transmission and transmits the driving force to the driving wheel, and switches the transmission state of the driving force according to the connection / disconnection of the hydraulic clutch. In the hybrid vehicle, hydraulic supply means for supplying oil to the hydraulic clutch, clutch drive means for supplying the oil supplied by the hydraulic supply means to the hydraulic clutch and driving the hydraulic clutch to connect / disconnect, and the hybrid vehicle And a clutch control means for instructing the clutch drive means to connect and disconnect the clutch based on the running state of the motor, and a motor cooling system for cooling the motor by supplying oil supplied from the hydraulic pressure supply means to the motor. And the clutch driving means, when the engagement / disengagement operation of the hydraulic clutch is executed, the motor cooling Motor cooling limiting means for limiting oil supply to the motor by a stage, and engine rotational speed detecting means for detecting the rotational speed of the engine, wherein the hydraulic pressure supply means is an oil pump driven by engine rotation The motor cooling limiting means is configured such that when the engine rotation speed detected by the engine rotation speed detection means is equal to or higher than a preset rotation determination value, the clutch driving means executes the connection / disconnection operation of the hydraulic clutch. Even if it is, the oil supply amount to the motor is not limited.
The invention of claim 2 further comprises motor temperature detecting means for detecting the temperature of the motor according to claim 1, wherein the motor cooling limiting means is configured such that the motor temperature detected by the motor temperature detecting means is equal to the cooling of the motor. The oil supply to the motor is stopped when the temperature is lower than the lower limit temperature required.

According to a third aspect of the present invention, in the first or second aspect, the clutch driving means completes the connecting / disconnecting operation of the hydraulic clutch after the precharge for applying a preload to the hydraulic clutch. The restricting means restricts oil supply to the motor by the motor cooling means when the precharge is executed by the clutch driving means .
According to a fourth aspect of the present invention, in the first aspect, the shift drive means that operates by the oil supplied from the hydraulic pressure supply means to perform the shift operation of the transmission, and the shift drive means based on the traveling state of the hybrid vehicle. A shift control means for instructing a shift operation, and the oil cooling limiting means is configured to perform the connecting / disconnecting operation of the hydraulic clutch by the clutch drive means and the shift operation of the transmission by the shift drive means. The amount of oil supplied to the motor by the motor cooling means is limited.

As described above, according to the hybrid vehicle of the first aspect of the present invention, the clutch driving means causes the hydraulic clutch to be connected / disconnected by the oil supplied from the hydraulic pressure supplying means based on the connection / disconnection instruction from the clutch control means. At the same time, the oil is supplied to the motor by the motor cooling means for cooling, and when the clutch driving means is engaged / disengaged by the hydraulic clutch, the oil supply to the motor by the motor cooling means is restricted to supply the hydraulic pressure. When the means is an engine-driven oil pump and the engine rotational speed is equal to or higher than the rotation determination value, the amount of oil supplied to the motor is not limited even when the clutch drive means is performing the connecting / disconnecting operation of the hydraulic clutch. I did it.
Therefore, since the restriction of the oil supply to the motor is limited only during the connecting / disconnecting operation of the hydraulic clutch, the motor cooling is not hindered. On the other hand, since the oil supply amount necessary for the connecting / disconnecting operation of the hydraulic clutch can be secured by the restriction of the oil supply, the hydraulic clutch can be smoothly connected / disconnected. And since it is not necessary to increase the capacity | capacitance of a hydraulic-pressure supply means so that the oil supply amount requested | required by simultaneous operation | movement with a motor cooling and a clutch drive means may be eliminated, the drive loss of a hydraulic-supply means can be reduced. Further, in a situation where the engine rotation speed is equal to or higher than the rotation determination value and the oil pump can satisfy the oil supply amount required by the simultaneous operation of the motor cooling and the clutch driving means, the oil supply amount to the motor is not limited. For this reason, motor cooling can be continued as much as possible to achieve failure reduction and life extension.

According to a hybrid vehicle of a third aspect of the present invention, in addition to the first or second aspect , when the clutch driving means performs precharge of the hydraulic clutch, the amount of oil supplied to the motor is limited by the motor cooling limiting means. I did it.
Accordingly, it is possible to secure an oil supply amount necessary for precharging the hydraulic clutch, and to smoothly connect and disconnect the hydraulic clutch .

According to the hybrid vehicle of the invention 請 Motomeko 4, in addition to any one of claims 1 to 3, disengaging operation of the hydraulic clutch is executed by the clutch driving means, and the shift operation of the transmission is executed by the shift drive means In this case, the amount of oil supplied to the motor by the motor cooling means is limited.
Therefore, it is possible to secure the oil supply amount necessary for the connecting / disconnecting operation of the hydraulic clutch and the shifting operation of the transmission without causing an obstacle to the cooling of the motor. The engagement shock can be prevented.

It is a whole block diagram which shows the hybrid type truck of 1st and 2nd embodiment. It is a flowchart which shows the motor cooling control routine which ECU of 1st Embodiment performs. It is a flowchart which shows the motor cooling control routine which ECU of 2nd Embodiment performs.

[First Embodiment]
Hereinafter, a first embodiment in which the present invention is embodied in a hybrid truck will be described.
FIG. 1 is an overall configuration diagram showing a hybrid truck of the present embodiment. The truck is configured as a parallel hybrid electric vehicle. The input side of the clutch 3 (hydraulic clutch) is connected to the output shaft 1a of the diesel engine 1 via an oil pump 2 (hydraulic supply means), and the input side of the clutch 3 is rotated together with the oil pump 2 during operation of the engine 1. The The output side of the clutch 3 is connected to the input side of the transmission 5 via the rotating shaft of the motor 4, and the motor 4 can also function as a generator such as a permanent magnet synchronous motor. The output side of the transmission 5 is connected to left and right drive wheels 9 via a propeller shaft 6, a differential 7 and a drive shaft 8.

Therefore, when the clutch 3 is connected, both the output shaft 1a of the engine 1 and the rotating shaft of the motor 4 are mechanically connected to the drive wheel 9 side via the transmission 5, and the driving force of the engine 1 and the motor 4 is changed. After being shifted according to the gear position of the machine 5, it is transmitted to the drive wheels 9. Further, when the clutch 3 is disengaged, only the rotating shaft of the motor 4 is mechanically connected to the drive wheel 9 side via the transmission 5, and the driving force of the motor 4 is shifted according to the gear stage of the transmission 5. It is transmitted to the drive wheel 9 later.
The motor 4 is driven and controlled by the inverter 12 using the traveling battery 11 as a power source, and transmits driving force to the driving wheel 9 side. The motor 4 at the time of deceleration of the vehicle operates as a generator by being reversely driven from the drive wheel 9 side, and the generated power is charged to the battery 11 by the inverter 12, and the regenerative torque of the motor 4 at this time A deceleration resistance is applied to the drive wheels 9.

The transmission 5 is configured based on a general manual transmission, and as described below, the shifting operation and the connecting / disconnecting operation of the clutch 3 associated with the shifting are automated.
That is, a hydraulic clutch actuator 13 (clutch driving means) is connected to the clutch 3, and the clutch actuator 13 is connected and disconnected. The clutch actuator 13 drives the clutch 3 in the connecting direction as the hydraulic pressure rises, and the return to the cutting direction is performed using the biasing force of the return spring built in the clutch 3.

However, the relationship between the increase / decrease of the hydraulic pressure and the connecting / disconnecting direction of the clutch 3 is not limited to the above. For example, contrary to the above, the clutch actuator 3 may drive the clutch 3 in the disconnection direction as the hydraulic pressure increases.
The transmission 5 is connected to a hydraulic gear shift actuator 14 (transmission driving means), and the gear stage is switched by the gear shift actuator 14. As is well known, in a manual transmission, a sleeve is coupled to a gear of each shift stage by a synchronizing mechanism while being synchronized with the gear, thereby achieving a desired shift stage. For this reason, a single gear shift actuator 14 is shown in the figure, but in reality, the number of gear shift actuators 14 corresponding to each sleeve is arranged on the transmission 5.

The clutch actuator 13 and each gear shift actuator 14 are connected to the oil pump 2 through an oil passage 15 (motor cooling means). When oil is supplied from the oil pump 2, the clutch actuator 13 is engaged and disengaged with the clutch 3, and each gear shift actuator 14 performs a shift operation of the transmission 5.
The oil passage 15 is also connected to a circulation path (motor cooling means) (not shown) formed in the motor 4 so that oil from the oil pump 2 circulates in the circulation path so that the motor 4 is cooled. It has become.

The operation of the engine 1 and the motor 4, the connecting / disconnecting operation of the clutch 3, the shifting operation of the transmission 5 and the like are executed by the ECU 21 (electronic control unit). For these controls, the rotational speed sensor 22 for detecting the engine rotational speed Ne, the temperature sensor 23 for detecting the motor temperature Tm, the accelerator sensor 24 for detecting the accelerator operation amount θacc, and the vehicle speed V are detected on the input side of the ECU 21. Various sensors such as a vehicle speed sensor 25 are connected. On the output side of the ECU 21, various devices such as the oil pump 2, a fuel injection valve (not shown) provided in each cylinder of the engine 1, an inverter 12 that drives and controls the motor 4, a clutch actuator 13, and each gear shift actuator 14. Is connected.
For example, the ECU 21 calculates the driver's required torque based on the accelerator operation amount θacc and the like, while calculating the vehicle running state, the operating state of the engine 1 and the motor 4, or the SOC (State Of Charge) of the battery 11. Based on this, the required torque is distributed to the engine 1 side and the motor 4 side, and the respective target driving forces are calculated. Then, in order to achieve the target driving force, the fuel injection valve is driven and controlled to operate the engine 1, and the inverter 12 is driven and controlled to operate the motor 4. Thus, the vehicle travels while appropriately switching between engine travel using only the engine 1 as a drive source, motor travel using only the motor 4 as a drive source, and engine / motor combined travel using the engine 1 and the motor 4 as drive sources.

On the other hand, for example, the ECU 21 calculates the target gear position of the transmission 5 from a shift map (not shown) based on the accelerator operation amount θacc and the vehicle speed V when the D range is selected by the select lever provided in the driver's seat. Then, the target shift speed is achieved by instructing the clutch actuator 13 to connect / disconnect the clutch 3 and instructing the gear shift actuator 14 to switch the shift speed so as to correspond to the target shift speed. Control to do. As a result, the vehicle is always driven with an appropriate gear position.
Further, for example, when the SOC of the battery 11 decreases and falls below a predetermined determination value during motor traveling, the ECU 21 determines that the motor traveling cannot be continued and controls to switch to engine / motor combined traveling. At this time, the ECU 21 instructs the clutch actuator 13 to connect the clutch 3 that has been kept disconnected while the motor is running, thereby supplying the driving force of the engine 1 together with the driving force of the motor 4 to the driving wheels 9. Control to transmit to the side.

Meanwhile, the oil supplied from the oil pump 2 is consumed by circulating through the circulation path in the motor 4, and is also consumed by the clutch actuator 13 when the clutch 3 is connected / disconnected. Since the clutch actuator 13 needs to increase the hydraulic pressure when the clutch 3 is connected, more specifically, the oil is consumed by the clutch actuator 13 when the clutch 3 is connected. When the capacity of the oil pump 2 is increased to satisfy such requirements for motor cooling and clutch 3 connection operation, as described in [Problems to be Solved by the Invention], the drive loss of the engine 1 increases. As a result, adverse effects such as deterioration of fuel consumption occur.
Therefore, when an electromagnetic on-off valve 26 (motor cooling limiting means) is interposed in the oil passage 15 connecting the oil pump 2 and the motor 4, and the clutch 3 is connected, the ECU 21 closes the on-off valve 26. Thus, measures are taken to temporarily interrupt the motor cooling by shutting off the oil supply to the motor 4. In the present embodiment, it is assumed that the clutch 3 is connected in accordance with the switching of the traveling mode, such as switching from motor traveling to engine / motor combined traveling, and at this time, the on-off valve 26 is closed. Hereinafter, the control of the on-off valve 26 executed by the ECU 21 will be described in detail.

FIG. 2 is a flowchart showing a motor cooling control routine executed by the ECU 21 of the first embodiment. The ECU 21 executes the routine at predetermined control intervals while the vehicle is traveling.
First, it is determined whether or not the motor temperature Tm detected by the temperature sensor 23 in step S2 is equal to or higher than a temperature determination value Tm0. The temperature determination value Tm0 is set in advance as a lower limit temperature that requires cooling of the motor 4 with oil. For example, when the motor temperature Tm is less than the temperature determination value Tm0 during traveling in a cold region, the determination of No (No) is made in step S2, the process proceeds to step S4, and the on-off valve 26 is closed. End the routine. Although the oil does not circulate in the circulation path of the motor 4 due to the closing of the on-off valve 26, the cooling action cannot be obtained. However, since the temperature Tm of the motor 4 at this time is extremely low, the cooling by the oil is stopped. Drive without any problems.

Further, when the motor temperature Tm is determined to be equal to or higher than the temperature determination value Tm0 and the determination of Yes (Yes) is made in step S2, is there an instruction to shift to step S6 and to engage the clutch 3 with the switching of the travel mode? Determine whether or not. When the determination is No, the routine proceeds to step S8, the open / close valve 26 is opened, and the routine is terminated. By opening the on-off valve 26, oil circulates in the circulation path of the motor 4, and the motor 4 is cooled by the oil and continues to operate without any problem.
When the determination in step S6 is Yes, the process proceeds to step S10 to determine whether or not the engine speed Ne is less than the rotation determination value Ne1. The discharge amount of the oil pump 2 increases as the engine rotation speed Ne increases. For example, the rotation determination value Ne1 is a lower limit rotation speed that can satisfy the oil supply amount required for simultaneous operation of the motor cooling and the clutch actuator 13. Is set to When the determination is No, the routine proceeds to step S12, where the on-off valve 26 is opened, and in the subsequent step S14, the clutch actuator 13 is engaged by the clutch actuator 13, and then the routine is terminated.
By opening the on-off valve 26, oil circulates in the circulation path of the motor 4 to cool the motor, and the required oil supply amount increases. However, since the discharge amount of the oil pump 2 is sufficient due to the increase in the engine rotational speed Ne, the clutch 3 is smoothly connected by the clutch actuator 13 and the travel mode is switched without causing an engagement shock.

The connection operation of the clutch 3 may be executed by any control content. For example, it is possible to simply raise the hydraulic pressure of the clutch actuator 13 and operate the clutch 3 in the connecting direction, or first actuate the clutch 3 in the connecting direction by the idle stroke (referred to as precharge) and then completely You may connect.
When the determination in step S10 is Yes, the process proceeds to step S16 to close the on-off valve 26 (motor cooling limiting means), and then the clutch 3 is connected in step S14. At this time, the engine rotational speed Ne is low and the discharge amount of the oil pump 2 is not sufficient. However, since the motor cooling is interrupted by closing the on-off valve 26, the oil supply amount necessary for the connection operation of the clutch 3 is ensured. . Therefore, the clutch 3 is smoothly connected by the clutch actuator 13.
When the instruction to connect the clutch 3 is lost, the determination in step S6 becomes No. Therefore, the on-off valve 26 is opened in step S8 and the motor cooling is restarted. Will not occur.

  As described above, in the hybrid truck according to the present embodiment, when the clutch 3 is engaged in connection with the switching of the traveling mode, the on-off valve 26 is closed and the oil supply to the motor 4 is interrupted. Accordingly, it is possible to secure an oil supply amount necessary for the connection operation of the clutch 3 without causing an obstacle to cooling the motor, and to smoothly engage the clutch 3 to prevent an engagement shock at the time of switching the traveling mode. . And since it is not necessary to increase the capacity | capacitance of the oil pump 2 so that the oil supply amount requested | required by simultaneous operation | movement with motor cooling and the clutch actuator 13 may be satisfied, the drive loss of the engine 1 which drives the oil pump 2 It is possible to prevent adverse effects such as an increase and consequently a deterioration in fuel consumption.

Even when the clutch 3 is engaged, when the engine speed Ne is equal to or higher than the rotation determination value Ne1 and the discharge amount of the oil pump 2 is sufficient, the on-off valve 26 is held open. For this reason, motor cooling can be continued as much as possible, and thus the motor 4 can be operated in a favorable temperature environment, and effects such as failure reduction and life extension can be obtained.
In addition, as is apparent from FIG. 1, the present embodiment is obtained by adding an on / off valve 26 for opening and closing the oil passage 15 and a process of the ECU 21 corresponding to the routine of FIG. 2 to a general hybrid type truck. It can be implemented with a simple configuration. Since the valves used in the general hydraulic circuit can be used as the on-off valve 26, the above various effects can be obtained at a very low cost.
On the other hand, since it is not necessary to increase the capacity of the oil pump 2, when the drive system parts are shared between the hybrid vehicle and the engine vehicle, the oil pump 2 can also be shared and the manufacturing cost can be reduced.

[Second Embodiment]
Next, a second embodiment in which the present invention is embodied in another hybrid truck will be described.
The overall configuration of the present embodiment is the same as that of the first embodiment shown in FIG. 1, and the difference is that the transmission 5 is different in the present embodiment from the first embodiment that assumes switching of the running mode. Assuming that the clutch 3 is engaged / disengaged as a result of the shifting operation, the on-off valve 26 is closed at this time. Therefore, the same components are denoted by the same member numbers and the description thereof is omitted, and the control of the on-off valve 26 by the ECU 21 will be described in detail.
FIG. 3 is a flowchart showing a motor cooling control routine executed by the ECU 21 of the second embodiment. The difference from the flowchart of FIG. 2 is that the processing contents of steps S6 and S10 and step S14 are changed to steps S22 to S26, and therefore, the different processing will be described mainly.

First, in step S2, it is determined whether or not the motor temperature Tm is equal to or higher than the temperature determination value Tm0. If the determination is Yes, it is determined in step S6 whether or not an instruction for shifting operation of the transmission 5 has been issued. When the target gear position of the transmission 5 is switched for upshifting or downshifting and there is an instruction for shifting operation, it is determined in step S10 whether or not the engine rotational speed Ne is less than the rotation determination value Ne2. The speed change operation of the transmission 5 is performed at a timing when the clutch 3 is switched while the clutch 3 is engaged / disengaged. For this reason, the lower oil speed of the clutch actuator 13 and the gear shift actuator 14 is selected so that the oil supply amount required by the simultaneous operation of the selected actuators 13 and 14 and motor cooling can be satisfied. As described above, the rotation determination value Ne2 is set.
When the determination in step S10 is No, the on-off valve 26 is opened in step S12, the clutch 3 is disconnected by the clutch actuator 13 in the subsequent step S22, the gear stage is switched by the gear shift actuator 14 in step S24, and the clutch actuator is determined in step S26. 13, the clutch 3 is connected and the routine is terminated. Since the discharge amount of the oil pump 2 is sufficient due to the increase in the engine rotation speed Ne, both the connection operation of the clutch 3 by the clutch actuator 13 and the speed change operation of the transmission 5 by the gear shift actuator 14 are performed smoothly, causing a shock. The shift to the target shift stage is completed without any problem.

As described in the first embodiment, in step S26, the clutch 3 may be connected by any control. For example, the clutch 3 may be completely connected after precharging.
When the determination in step S10 is Yes, after the opening / closing valve 26 is closed in step S16 (motor cooling limiting means), the processing in steps S22 to S26 is performed. Although the engine rotation speed Ne is low and the discharge amount of the oil pump 2 is not sufficient, the cooling of the motor is interrupted by closing the on-off valve 26, so that the oil supply necessary for the connection operation of the clutch 3 and the speed change operation of the transmission 5 is provided. The amount is secured. Therefore, the shift of the transmission 5 to the target shift stage is completed without causing a shock.
Then, since the determination in step S6 becomes No at the time when there is no shift operation instruction, the on-off valve 26 is opened in step S8 and the motor cooling is restarted, and a fatal problem occurs in the motor 4 during that time. There is no.

As described above, in the hybrid truck according to the present embodiment, when the shift operation to the target shift stage of the transmission 5 is performed with the connecting / disconnecting operation of the clutch 3, the opening / closing valve 26 is closed and the motor 4 is closed. The oil supply to was interrupted. Accordingly, it is possible to ensure the amount of oil supply necessary for the connection operation of the clutch 3 and the gear shift operation of the transmission 5 without causing an obstacle to cooling of the motor. Can prevent shock. Then, the capacity of the oil pump 2 is increased so as to satisfy the oil supply amount required by the simultaneous operation of the motor cooling and the clutch actuator 13 or the oil supply amount required by the simultaneous operation of the motor cooling and the gear shift actuator 14. Therefore, it is possible to prevent adverse effects such as an increase in driving loss of the engine 1 that drives the oil pump 2 and further deterioration in fuel consumption.
Although not redundantly described, the opening / closing valve 26 is opened when the engine rotational speed Ne is equal to or higher than the rotation determination value Ne2 and the discharge amount of the oil pump 2 is sufficient even during the shifting operation of the transmission 5. Therefore, the motor cooling can be continued as much as possible, and the processing can be performed with a simple configuration in which processing of the on-off valve 26 and the ECU 21 is added.

This is the end of the description of the embodiment, but the aspect of the present invention is not limited to this embodiment. For example, although the embodiments described above are embodied as hybrid trucks, the target vehicle is not limited to this, and may be embodied as, for example, a bus or a passenger car.
In the above embodiment, the clutch 3 is interposed between the engine 1 and the motor 4, but the layout of the drive system is not limited to this. For example, the engine 1 and the motor 4 may be directly connected, and the vehicle may be embodied as a layout in which the clutch 3 is interposed between the motor 4 and the transmission 5.
In the above-described embodiment, the manual transmission including the single clutch 3 is used as a base, and the transmission 5 is realized by automating the shift operation and the clutch connecting / disconnecting operation. However, the type of the transmission 5 is limited to this. For example, a so-called dual clutch transmission may be used.

The configuration of the dual clutch transmission is well known in, for example, Japanese Patent Application Laid-Open No. 2009-035168, but two systems in which gear mechanisms divided into odd and even stages are connected to the engine side via clutches, respectively. This system includes a power transmission system. When the clutch of one gear mechanism is connected to transmit power, the clutch of the other gear mechanism is disconnected and switched to the next predicted gear position in advance. The clutch connection / disconnection state is reversed to start power transmission by the other gear mechanism, thereby preventing interruption of power transmission at the time of shifting.
Although not described in detail, even in such a dual clutch transmission, when either of the clutches connected / disconnected in the two power transmission systems is executed or accompanied by the clutch connecting / disconnecting operation, either If the oil supply for cooling the motor is shut off by closing the on-off valve when the gear mechanism performs a speed change operation, the same effect as the above embodiment can be obtained.

  Moreover, in the said embodiment, although the on-off valve 26 was comprised so that the oil supply from the oil pump 2 to the motor 4 might be interrupted | blocked, the function of the on-off valve 26 is not restricted to this. For example, the on-off valve 26 may be configured to reduce the amount of oil supplied to the motor 4 to about 50% when the valve is closed. Even in this case, the capacity of the oil pump 2 can be reduced by the amount by which the amount of oil supplied to the motor 4 is limited, and the motor cooling effect can be continuously obtained to some extent even when the on-off valve 26 is closed. Therefore, the opening degree (that is, the oil limit amount) of the on-off valve 26 may be set as appropriate in accordance with which of the capacity reduction of the oil pump 2 and the motor cooling is important.

1 Engine 2 Oil pump (hydraulic supply means)
3 Clutch (hydraulic clutch)
5 Transmission 9 Drive wheel 13 Clutch actuator (clutch drive means)
14 Gear shift actuator (transmission drive means)
15 Oil passage (motor cooling means)
21 ECU (motor cooling limiting means, clutch control means, shift control means)
26 On-off valve (motor cooling limiting means)

Claims (4)

In a hybrid vehicle in which the driving force of the engine and motor is shifted by a transmission and transmitted to driving wheels, and the transmission state of the driving force is switched according to the connection / disconnection of a hydraulic clutch.
Hydraulic supply means for supplying oil to the hydraulic clutch;
Clutch driving means for supplying the oil supplied by the hydraulic supply means to the hydraulic clutch and driving the hydraulic clutch to be connected and disconnected;
Clutch control means for instructing the clutch drive means to engage and disengage the clutch based on the traveling state of the hybrid vehicle;
Motor cooling means for cooling the motor by supplying oil supplied from the hydraulic pressure supply means to the motor;
A motor cooling limiting means for limiting oil supply to the motor by the motor cooling means when the clutch driving means performs a connecting / disconnecting operation of the hydraulic clutch;
Engine rotation speed detection means for detecting the rotation speed of the engine ;
With
The hydraulic pressure supply means is configured as an oil pump driven by engine rotation,
The motor cooling limiting means is a case where the clutch driving means is performing the connecting / disconnecting operation of the hydraulic clutch when the engine rotational speed detected by the engine rotational speed detecting means is equal to or greater than a preset rotation determination value. Even if it exists, the hybrid vehicle characterized by not restrict | limiting the oil supply amount to the said motor . A motor temperature detecting means for detecting the temperature of the motor;
The said motor cooling restriction | limiting means stops the oil supply to the said motor, when the motor temperature detected by the said motor temperature detection means is less than the minimum temperature which requires cooling of the said motor. The described hybrid vehicle. The clutch driving means completes the connecting / disconnecting operation of the hydraulic clutch after the precharge for applying a preload to the hydraulic clutch,
The motor cooling limiting means by the clutch driving means, when the precharge is performed, according to claim 1 or 2, characterized in that to limit the oil supply to the motor by the motor cooling means Hybrid vehicle. Shift drive means for operating a shift operation of the transmission by operating with oil supplied from the hydraulic pressure supply means;
Shift control means for instructing the shift drive means to perform a shift operation based on the traveling state of the hybrid vehicle;
With
The motor cooling limiting means is configured to connect the motor to the motor by the motor cooling means when the clutch driving means performs a connecting / disconnecting operation of the hydraulic clutch and the speed change driving means executes a speed change operation of the transmission. The hybrid vehicle according to claim 1, wherein the oil supply amount is limited.

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