JP2000186758A - Hydraulic pressure supplying device for power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To optimally control the output of an electric hydraulic pump according to the required oil for an automatic transmission and a start clutch. SOLUTION: The operation of a hydraulic pump 22 driven by an electric motor 21 is controlled according to the oil amount required by a CVT 5 and the oil amount required by a start clutch to supply hydraulic presser to the CVT 5 and the start clutch. The required oil amount is supplied always properly according to the operation state of the CVT 5 and the start clutch to operate the electric motor 21 and the hydraulic pump 22 efficiently, thereby restricting the electric power consumption of the electric motor 21 to the required minimum amount to decrease the fuel consumption, and simultaneously to reduce the size of the electric motor 21 and the hydraulic pump 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic power supply for a power transmission device in a vehicle for supplying hydraulic pressure to an automatic transmission by an electric oil pump.

[0002]

2. Description of the Related Art As an automatic transmission, for example, a continuously variable transmission in which a belt is stretched over an input pulley and an output pulley whose groove width can be changed is conventionally known (Patent Registration No. 26).
No. 51810). In such a power transmission device, a start clutch is provided between the continuously variable transmission and the driving wheel side to absorb torque fluctuation on the engine side and to prevent torque fluctuation from being transmitted to the driving wheel side. The slippage of the starting clutch is controlled by adjusting the engagement state of the starting clutch. A conventional power transmission device is a hydraulic pressure supply device in which oil pressure is supplied to an automatic transmission and a starting clutch by an oil pump driven directly by an engine.

[0003]

A conventional hydraulic power supply for a power transmission device supplies oil pressure to an automatic transmission and a starting clutch by an oil pump driven by an engine, so that it is sufficient even when the rotational speed of the engine is low. Large oil pumps have been used so that a large amount of oil can be secured. For this reason, when the rotation speed of the engine is high, the amount of discharged oil becomes excessive, which causes deterioration of fuel efficiency, and is disadvantageous in terms of cost and weight.

[0004] Further, since automatic transmission control requires hydraulic pressure, it is necessary to constantly drive the engine. Therefore, when a conventional hydraulic power supply for a power transmission device is applied to a hybrid vehicle that obtains driving force by using both an electric motor and an engine, it is possible to stop the engine when idling or to stop the engine when driving the motor. It is limited, and a dramatic improvement in fuel efficiency cannot be expected. In a hybrid vehicle, the oil pump may be driven by an electric motor.However, since the oil pressure consumed in automatic transmission control is not constant and the required oil amount is constantly changing, the oil pump is adjusted according to the required oil amount. It is not easy to optimally control the output of the device, and at present the technology has not been established.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a hydraulic transmission device for a power transmission device capable of optimally controlling the output of an electric oil pump in accordance with the required oil amount of the power transmission device. With the goal.

[0006]

According to the first aspect of the present invention, there is provided a power transmission device having an automatic transmission and a starting clutch. The amount of oil is derived, the amount of oil required for the starting clutch is derived based on the operating state of the starting clutch, and the operation of the electric oil pump is controlled based on both amounts of oil. Therefore, the required oil amount can always be appropriately supplied according to the operation states of the automatic transmission and the starting clutch, and the electric oil pump can be operated efficiently.

In order to achieve the above object, according to the second aspect of the present invention, in a power transmission device having an automatic transmission,
First based on actual line pressure and target line pressure of automatic transmission
In addition to deriving a target oil amount, a second target oil amount based on the actual shift state and the target shift state of the automatic transmission is derived, and the electric oil pump is driven based on the first target oil amount and the second target oil amount. The operation is controlled. For this reason,
The required oil amount can always be appropriately supplied according to the line pressure and the state of the shift, and the electric oil pump can be operated efficiently.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic configuration of a vehicle to which a hydraulic power supply for a power transmission according to an embodiment of the present invention is applied, and FIG. 2 is a system configuration of a hydraulic power supply for a power transmission. FIG. 3 shows a block configuration of a hydraulic power supply device for a power transmission device. The vehicle shown in the figure is a hybrid vehicle that obtains driving force by using both an electric motor and an engine, and is a vehicle equipped with a start clutch and a continuously variable transmission. The present invention can be applied to a vehicle having no automatic transmission, a vehicle having an automatic transmission in which a plurality of frictional engagement elements are combined, and the like.

As shown in FIG. 1, an output shaft 2 of an engine 1
Is connected to the input side of a continuously variable transmission (CVT) 5 through a clutch 3 and a double pinion type planetary gear mechanism 4 for switching between forward and reverse. An electric motor / generator (M / G) 6 also serving as an engine starting motor is connected to the input side of the CVT 5. The output side of the CVT 5 is connected to a differential 8 via a starting clutch 7, and the driving force is transmitted to driving wheels 9. Reference numeral 41 in the drawing denotes a brake for stopping the ring gear of the planetary gear mechanism 4.

In the above-described hybrid vehicle, the on / off of the clutch 3 and the drive control of the engine 1 are
The M / G 6 alone transmits the driving force to the input side of the CVT 5 to drive the drive wheels 9 and, if necessary, the engine 1 to drive the M / G
There are various operation modes for driving the drive wheels 9 by transmitting the driving force to the input side of the CVT 5 by using the G 6 and the engine 1 together. That is, if the M / G 6 is operated with the motor in a state where the clutch 3 is turned off and the brake 41 is turned off, the motor runs in the motor alone mode. . When the clutch 3 is turned on and the brake 41 is turned off, the planetary gear mechanism 4 rotates integrally with the output shaft of the engine 1. If you operate the motor 6, you can use the engine / motor combined driving mode, M / G 6
When the power generation operation is performed, the driving mode becomes the combined use of the engine and the generator. The engine 1 is started by transmitting the motor output of the M / G 6 to the output shaft of the engine 1 in this state. In a state where the clutch 3 is turned off and the brake 41 is turned on, the carrier of the planetary gear mechanism 4 rotates in reverse with respect to the output shaft of the engine 1, so that the engine can be driven backward by the output of the engine.

The CVT 5 is an input pulley 1 having a variable groove width.
A belt 13 is stretched between the output pulley 1 and the output pulley 12, and by changing the groove width of the input pulley 11 and the output pulley 12, a predetermined gear ratio can be obtained. The input pulley 11 and the output pulley 12 of the CVT 5
The groove width is changed by driving a shift actuator (not shown), and a hydraulic pressure generated by an oil pump 22 driven by an electric motor 21 is supplied to the shift actuator. The oil pressure generated by the oil pump 22 is also supplied as lubricating oil for each part of the CVT 5.

The rotational speed of the electric motor 21, that is, the output of the oil pump 22, is controlled in accordance with the required oil amount derived based on the operating state of the CVT 5 and the operating state of the starting clutch 7. I have. The state of the output control of the oil pump 22 will be described with reference to FIGS.

As shown in FIG. 2, the rotation of the electric motor 21 is controlled by a command from a controller 23 for the electric motor 21 as a control means.
And the required oil amount is supplied to the CVT 5. In the controller 23, transmission input torque information which is an input torque from the engine 1 or the M / G 6 side and target gear ratio information which is set based on a running state of the vehicle are control means for the power train of the engine 1 and the like. Input from the powertrain control unit (PCU) 24. Further, vehicle speed information, actual speed ratio information, actual line pressure information, and slip speed information of the starting clutch 7 are input to the controller 23 as information from sensors. In the controller 23, the required oil amount is set as the target oil amount based on the input various information, and the rotation of the electric motor 21 is controlled in accordance with the target oil amount.

As shown in FIG. 3, the storage unit 31 of the controller 23 previously stores the amount of lubricating oil of each part of the CVT 5 as a fixed value.
The target oil amount is calculated by adding various necessary oil amounts in the fourth to fourth adding units 32 to 35.

That is, the controller 23 is provided with a leak amount setting unit 41, and information on the actual line pressure (sensor input) is input to the leak amount setting unit 41. The leak amount setting unit 41 searches (or calculates) a map of the leak amount according to the actual line pressure, and calculates the required oil amount according to the leak amount in the first adding unit 32.
Is added.

The controller 23 is provided with a first oil amount setting unit 42. The first oil amount setting unit 42 includes an actual line pressure and a target line pressure (an absolute value of a transmission input torque and a rotation speed and a ratio thereof). Information is input. In the first oil amount setting unit 42, the CV is set based on the actual line pressure and the target line pressure.
The first target oil amount for securing the oil amount required for the shift operation and stable shift control at T5 is searched (or calculated) on a map, and the required oil amount according to the first target oil amount is determined as the second oil amount.
The addition is performed by the addition unit 33. The first target oil amount is an oil amount for quickly controlling the target line pressure by adjusting the value added by the adding unit 33 according to the deviation between the actual line pressure and the target line pressure. The first target oil amount may be a map search or calculated based on the deviation between the actual line pressure and the target line pressure.

The controller 23 is provided with a second oil amount setting unit 43, and the second oil amount setting unit 43 includes a target gear ratio (set in a running state of the vehicle) and an actual gear ratio (sensor input:
Information about the ratio of the rotation speed of the input shaft to the output shaft) is input. The second oil amount setting section 43 searches (or calculates) a map of the second target oil amount required for the CVT 5 based on the target gear ratio and the actual gear ratio, and calculates the required oil amount according to the second target oil amount. The addition is performed by the third adding unit 34. The second target oil amount is an oil amount for securing an oil amount necessary for a shift actuator (not shown) and appropriately executing the shift of the CVT 5 within a predetermined time.

Further, the controller 23 is provided with a third oil amount setting unit 44. The third oil amount setting unit 44 includes a slip speed of the starting clutch 7 (sensor input: a difference between the input and output rotation speeds of the starting clutch 7). Information is input. The third oil amount setting unit 44 searches (or calculates) a map of the required cooling oil amount according to the slip speed of the starting clutch 7, and adds the required oil amount according to the cooling oil amount at the fourth adding unit 35. Is done.
The cooling oil amount is an oil amount for suppressing heat generation according to the slip speed of the starting clutch 7 and securing an oil amount of lubricating oil necessary to prevent burning of the starting clutch 7.

In the controller 23, the leakage amount, the first target oil amount, the second target oil amount, and the cooling oil amount with respect to the oil amount stored in the storage unit 31 are first to fourth addition units 32 to 35, respectively. The addition is performed, and the target oil amount is set. When the target oil amount is set, the electric motor 21 according to the set target oil amount is set.
Is controlled, and the oil pump 22 is driven to a state where the target oil amount is secured.

That is, the hydraulic pressure supply device having the above configuration
5, a shift is performed at a predetermined time, with a lubricating oil amount of each part (considering a leak amount according to the actual line pressure), a first target oil amount according to a deviation between the target line pressure and the actual line pressure. Therefore, the sum of the second target oil amount according to the target gear ratio and the actual gear ratio and the lubricating oil amount according to the slip speed of the starting clutch 7 is set as the target oil amount. The rotation speed of the electric motor 21, that is, the output of the oil pump 22 is controlled based on the target oil amount.

Accordingly, the operation of the oil pump 22 driven by the electric motor 21 is controlled based on the amount of oil required for the CVT 5 and the amount of oil required for the starting clutch 7, and hydraulic pressure is applied to the CVT 5 and the starting clutch 7. Since the oil is supplied, the required oil amount can always be appropriately supplied in accordance with the operation state of the CVT 5 and the starting clutch 7, and the electric motor 21 and the oil pump 22 can be operated efficiently. For this reason, the power consumption of the electric motor 21 is minimized and the electric motor 21
In addition, the size of the oil pump 22 can be reduced. Further, since an oil pump driven by the engine 1 is not used, the engine 1 can be stopped during traveling to improve fuel efficiency.

[0022]

According to the first aspect of the present invention, there is provided a hydraulic transmission device for a power transmission device, comprising: a power transmission device having an automatic transmission and a starting clutch, the amount of oil required for the automatic transmission based on the operation state of the automatic transmission. And the amount of oil required for the starting clutch is derived based on the operating state of the starting clutch, and the operation of the electric oil pump is controlled based on both oil amounts. The required oil amount can always be appropriately supplied according to the state, and the electric oil pump can be operated efficiently. As a result, it is possible to optimally control the output of the electric oil pump in accordance with the required oil amount of the power transmission device including the automatic transmission and the starting clutch, thereby suppressing power consumption and improving fuel efficiency. .

Further, since the engine-driven pump is not used, it is possible to easily cope with a vehicle in which the engine is stopped during traveling.

According to a second aspect of the present invention, there is provided a hydraulic transmission device for a power transmission device, comprising: a power transmission device having an automatic transmission, wherein the first target oil amount based on the actual line pressure and the target line pressure of the automatic transmission is determined. And deriving a second target oil amount based on the actual shift state and the target shift state of the automatic transmission, and controlling the operation of the electric oil pump based on the first target oil amount and the second target oil amount. As a result, the required amount of oil can always be appropriately supplied according to the line pressure and the state of shifting,
The electric oil pump can be operated efficiently.
As a result, it is possible to optimally control the output of the electric oil pump in accordance with the required oil amount of the power transmission device including the automatic transmission, thereby suppressing power consumption and improving fuel efficiency.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a vehicle to which a hydraulic power supply device for a power transmission device according to an embodiment of the present invention is applied.

FIG. 2 is a system configuration diagram of a hydraulic supply device for a power transmission device.

FIG. 3 is a block diagram of a hydraulic pressure supply device for a power transmission device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine 3 Clutch 4 Planetary gear mechanism 5 Continuously variable transmission (CVT) 6 Electric motor / generator (M / G) 7 Start clutch 9 Drive wheel 21 Electric motor 22 Oil pump 23 Controller 31 Storage unit 41 Leakage amount setting unit 42 First oil amount setting unit 43 Second oil amount setting unit 44 Third oil amount setting unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16H 63:06 (72) Inventor Yuichi Gota 33-8-8 Shiba 5-chome, Minato-ku, Tokyo Mitsubishi Motors Corporation F term (reference) 3D041 AA09 AA21 AB01 AC06 AC15 AC20 AD17 AD21 AD22 AD23 AD31 AE14 AE22 AE39 3J052 AA14 CB01 EA03 FB25 GC65 GC72 HA11 HA18 KA01 LA01

Claims (2)

[Claims] 1. A power transmission device comprising: an automatic transmission for automatically adjusting a gear ratio according to a traveling state of a vehicle; and a starting clutch provided between an engine and driving wheels. An electric oil pump that supplies oil pressure to the starting clutch; and an amount of oil necessary for the automatic transmission is derived based on an operating state of the automatic transmission. A hydraulic supply device for a power transmission device, comprising: control means for deriving an oil amount and controlling the operation of the electric oil pump based on the two oil amounts. 2. A power transmission device having an automatic transmission that automatically adjusts a gear ratio according to a traveling state of a vehicle, comprising: an electric oil pump that supplies a hydraulic pressure to the automatic transmission; Deriving a first target oil amount based on a line pressure and a target line pressure, and deriving a second target oil amount based on an actual shift state and a target shift state of the automatic transmission. A hydraulic supply device for a power transmission device, comprising: control means for controlling the operation of the electric oil pump based on the second target oil amount.