JP2017025741A - Oil supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an oil pump to supply oil properly.SOLUTION: An oil supply device includes: an oil pump 42 for supplying oil; a motor 41 for driving the oil pump 42; and a motor control part 9, which operates when the oil pump 42 starts supplying the oil, for controlling a revolving speed of the motor 41 so as to increase with time and, for a prescribed time or more, to maintain a revolving speed equal to or lower than a discharge revolving speed that is lower than a steady revolving speed of the motor 41.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an oil supply apparatus including an oil pump for supplying oil to a predetermined oil supply destination.

  Conventionally, an oil pump is used to circulate oil in a vehicle transmission. For example, in an oil pump, when the pump is started, so-called inching is repeatedly performed by driving the pump for a short time and stopping it.

  Since the viscosity of hydraulic oil changes greatly according to temperature, a technique for changing the contents of inching according to the hydraulic oil temperature at the time of starting the pump is known (for example, see Patent Document 1).

  Further, a brushless motor is used as a motor for driving the oil pump.

JP-A-8-193591

  The viscosity of the oil supplied by the oil pump varies depending on the temperature. For example, when the oil temperature is low and the oil viscosity is high, the load for driving the oil pump is large. For this reason, when the oil pump is driven by a brushless motor, the timing for switching the current in the brushless motor is shifted, that is, the step-out occurs, the oil pump cannot be driven properly, and the oil is appropriately supplied. There is a possibility that it cannot be supplied. Such a situation cannot be solved by, for example, so-called step input for switching on / off the power supplied to the brushless motor.

  An object of this invention is to provide the technique which can supply oil appropriately with an oil pump.

  To achieve the above object, an oil supply apparatus according to an aspect of the present invention includes an oil pump for supplying oil from a predetermined oil supply source to a predetermined oil supply destination, and a brushless for driving the oil pump. When the oil supply by the motor and the oil pump is started, the rotation speed of the brushless motor is increased with the passage of time, and the rotation speed equal to or lower than the first rotation speed lower than the steady rotation speed of the brushless motor is predetermined. Motor control means for controlling to maintain for more than a time.

  In the oil supply apparatus, the motor control means may increase the rotation speed of the brushless motor stepwise.

  In the oil supply apparatus, the motor control means may increase the rotation speed of the brushless motor toward the first rotation speed.

  Further, in the oil supply device, the predetermined time is present in at least the flow path from the oil pump to the oil supply destination after the brushless motor reaches the first rotation speed and before the operation of the brushless motor starts. It may be the time until all of the oil is supplied to the oil supply destination.

  In the oil supply apparatus, the motor control means may control the brushless motor so as to have a steady rotation speed after a predetermined time has elapsed.

  The oil supply apparatus may further include an oil cooling unit for cooling the oil supplied from the oil supply source.

  The oil supply device further includes a temperature sensor that detects the temperature of the oil at the oil supply source, and controls the oil pump to start supplying oil when the oil temperature exceeds a predetermined temperature. You may make it further have a pump drive control means to do.

  Further, in the oil supply apparatus, the pump drive control means may perform control so as to stop the oil supply by the oil pump when a predetermined operation end condition is met.

  In the oil supply device, the oil supply source and the oil supply destination may be the same device.

  Further, in the oil supply apparatus, the oil supply source may be a transmission that shifts and transmits power.

  According to the present invention, oil can be appropriately supplied by the oil pump.

It is a typical lineblock diagram showing a part of vehicles provided with an oil supply device concerning one embodiment of the present invention. It is a figure explaining an example of transition of the target number of rotations of the motor which drives the oil pump concerning one embodiment of the present invention. It is a flowchart of the oil supply control process which concerns on one Embodiment of this invention.

  Hereinafter, based on an accompanying drawing, an oil supply device concerning one embodiment of the present invention is explained. The same parts are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  FIG. 1 is a schematic configuration diagram showing a part of a vehicle including an oil supply device according to an embodiment of the present invention.

  The vehicle 1 includes a transmission 2 that shifts a driving force of an engine (not shown) and transmits the driving force to driving wheels (not shown), and an oil supply device 3 that circulates (supplies) oil of the transmission 2. The transmission 2 is a manual transmission, for example, and has a plurality of gears, shafts, and the like (not shown). In the case of the transmission 2, oil (mission oil) is enclosed in order to reduce friction generated inside and to discharge heat generated inside to the outside. The oil is discharged from a discharge port 2 a formed in the lower part of the case of the transmission 2, flows through the oil passage of the oil supply device 3, and again from the introduction port 2 b formed in the middle part of the case of the transmission 2. It is introduced into the case of the transmission 2. An oil pipe (not shown) whose tip is immersed in oil staying below in the case of the transmission 2 is connected to the discharge port 2a. In this embodiment, the transmission 2 is an oil supply source and an oil supply destination device.

  The oil supply device 3 includes an electric oil pump 4, an oil cooler 5 as an example of an oil cooling unit, a battery 6, a relay 7, a transmission ECU 8, a motor control unit 9 as an example of a motor control unit, Pipes 10, 11, 12 and a temperature sensor 13 are provided.

  The electric oil pump 4 includes a motor 41 and an oil pump 42. The motor 41 is, for example, a brushless motor. The oil pump 42 is, for example, a gear pump, and by rotating the two gears 42a and 42b, the oil is sucked from the suction port 42c and discharged (supplied) to the discharge port 42d. The oil cooler 5 has, for example, a plurality of thin tubes through which oil passes and fins connected to the thin tubes, and cools the oil that passes through the thin tubes.

  In the oil supply device 3, an oil flow path from the discharge port 2 a of the transmission 2 to the introduction port 2 b of the transmission 2 is formed. Specifically, one end of the pipe 10 is connected to the discharge port 2 a of the transmission 2, and the other end of the pipe 10 is connected to the suction port 42 c of the oil pump 42. Further, one end of the pipe 11 is connected to the discharge port 42 d of the oil pump 42, and the other end of the pipe 11 is connected to the inlet 5 a of the oil cooler 5. One end of the pipe 12 is connected to the outlet 5 b of the oil cooler 5, and the other end of the pipe 12 is connected to the inlet 2 b of the transmission 2. Accordingly, when the oil pump 42 is operated, the oil in the transmission 2 is sucked through the discharge port 2a of the transmission 2, and the sucked oil reaches the oil pump 42 through the pipe 10, and the oil The pump 42 reaches the oil cooler 5 via the pipe 11, is cooled by the oil cooler 5, and then is supplied (returned) into the transmission 2 via the pipe 12 through the inlet 2 b of the transmission 2.

  The temperature sensor 13 measures the temperature of oil accumulated in the lower part of the case of the transmission 2 and outputs a measurement result (oil temperature) to the transmission ECU 8.

  The battery 6 stores electric power and supplies electric power for operating the motor control unit 9, the motor 41, and the like.

  The relay 7 performs relay control of power supply from the battery 6 to the motor control unit 9. The relay 7 supplies power to the motor control unit 9 in accordance with the power supply instruction from the transmission ECU 8, and stops supplying power to the motor control unit 9 in accordance with the power supply stop instruction from the transmission ECU 8. .

  The transmission ECU 8 controls operations of the transmission 2, the motor control unit 9, the electric oil pump 4, and the like. The transmission ECU 8 includes a known CPU, ROM, RAM, input port, output port, and the like.

  The transmission ECU 8 includes a pump drive control unit 81 as an example of a pump drive control unit as a part of functional elements.

  The pump drive control unit 81 determines whether or not the measurement result (oil temperature) from the temperature sensor 13 is equal to or higher than a temperature (start reference temperature) that is a reference for starting the operation of the oil pump 42, and the oil temperature starts. When the temperature is equal to or higher than the reference temperature, the relay 7 is instructed to supply power to the motor control unit 9. Further, the pump drive control unit 81 determines whether or not the measurement result (oil temperature) from the temperature sensor 13 is equal to or lower than a temperature (end reference temperature) that is a reference for ending the operation of the oil pump 42. Is below the end reference temperature, the relay 7 is instructed to stop supplying power to the motor control unit 9.

  The motor control unit 9 is configured by an IC, for example, and controls the operation of the motor 41 using electric power supplied from the relay 7. The motor control unit 9 includes a rotation speed determination unit 91 and a power control unit 92 as functional elements. In addition, you may make it provide the functional element of the motor control part 9 in another hardware (for example, transmission ECU8).

  The rotational speed determination unit 91 determines a target rotational speed for rotating the motor 41 and passes it to the power control unit 92.

  Specifically, when the rotation of the motor 41 is started, the rotation speed determination unit 91 sets the target rotation to be equal to or less than the rotation speed during discharge (first rotation speed) until a predetermined time or more has elapsed from the start. Determine the number. Here, the discharge rotation speed is a rotation speed smaller than the rotation speed (steady rotation speed) when the motor 41 is operated in the oil supply device 3 more preferably. More preferably, the oil pump 42 is driven. Is a rotation speed at which step-out does not occur or is considered to be difficult. The discharging rotation speed may be estimated based on, for example, the performance of the motor 41 and the load on the drive of the oil pump 42 when high viscosity oil (for example, low temperature oil) is present in the flow path.

  The rotation speed determination unit 91 increases the target rotation speed as time elapses (for example, continuously or stepwise) until the rotation speed reaches the discharge rotation speed from the start time.

  Further, when the target rotational speed reaches the discharging rotational speed, the rotational speed determination unit 91 at least downstream of the oil pump 42 (piping 11, oil cooler 5, piping 12) when the rotation of the motor 41 starts. The target engine speed is set until the time longer than the time required until all oil (residual oil) existing in the engine is discharged from the oil supply device 3 (that is, until it is introduced into the transmission 2) has elapsed. Then, the rotation speed is set as the target rotation speed.

  As described above, the target rotational speed is set to the rotational speed at the time of discharging until the residual oil is discharged. Since the time has elapsed since the residual oil is discharged from the transmission 2, the temperature is relatively lowered and is high. If the steady-state rotation speed is set to the target rotation speed in a state where the residual oil remains in the flow path between the pipe 11 and the pipe 12, the load on the oil pump 42 is increased and the oil is increased. This is because the motor 41 that drives the pump 42 may step out. It should be noted that the rotation speed at the time of discharge is set to the target rotation until a time longer than the time until all of the residual oil including the oil existing in the pipe 10 and the oil pump 42 is discharged from the motor supply device 3 when the rotation of the motor 41 starts. It may be a number.

  The power control unit 92 controls the power (current and / or voltage) supplied to the motor 41 so as to rotate at the target rotation number determined by the rotation number determination unit 91.

  Next, an example of the change in the target rotational speed of the motor 41 that drives the oil pump 42 according to the embodiment of the present invention will be described.

  FIG. 2 is a diagram for explaining an example of the transition of the target rotational speed of the motor that drives the oil pump according to the embodiment of the present invention.

  When the rotation of the motor 41 is started, the rotation speed determination unit 91 sets the target rotation speed as the rotation speed R1 at the start time T0. Next, the rotational speed determination unit 91 sets the rotational speed R2 larger than the rotational speed R1 at the time point T1 as the target rotational speed, the rotational speed R3 larger than the rotational speed R2 at the time point T2, and the rotational speed at the time point T3. The number of revolutions RO at the time of discharge, which is a number of revolutions greater than R3. The time point T3 may be, for example, 15 seconds after the start of the operation.

Between time T3 until the residual oil is discharged, the rotation speed determination unit 91 maintains the target rotational speed as a discharge time of the rotational speed R _O. Thus, until the residual oil is discharged, since the target rotation speed is maintained during the rotational speed R _O emissions, it is possible to appropriately prevent the motor 41 resulting in loss of synchronism. Thereafter, the rotational speed determination unit 91 sets the rotational speed _RS at the steady state at the time T4 when the residual oil is discharged.

  Next, an oil supply control process in the vehicle 1 according to an embodiment of the present invention will be described.

  FIG. 3 is a flowchart of an oil supply control process according to an embodiment of the present invention.

  The oil supply control process is started, for example, at the same time as engine start (ignition switch key switch ON).

  First, the pump drive control unit 81 of the transmission ECU 8 determines whether or not the sensor value (oil temperature) from the temperature sensor 13 is equal to or higher than the start reference temperature (S11). As a result, when the oil temperature is not equal to or higher than the start reference temperature (S11: NO), the pump drive control unit 81 repeatedly executes step S11.

  On the other hand, when the oil temperature is equal to or higher than the start reference temperature (S11: YES), the pump drive control unit 81 instructs the relay 7 to supply electric power to the motor control unit 9, and the relay 7 performs transmission ECU8. In accordance with the power supply instruction from, power is supplied to the motor control unit 9 to start driving the oil pump 42 (S12).

  The rotation speed determination unit 91 of the motor control unit 9 that has received the supply of power determines the target rotation speed so that it is less than or equal to the discharge rotation speed until a predetermined time or more has elapsed from the start, and the power control unit 92 The electric power supplied to the motor 41 is controlled so as to rotate at the target rotational speed determined by the rotational speed determination unit 91. Thereby, the oil pump 42 can be driven appropriately without the motor 41 stepping out.

  When the oil pump 42 is driven, the oil in the transmission 2 is sucked through the discharge port 2a of the transmission 2 and flows into the pipe 10, and flows into the oil cooler 5 through the oil pump 42 and the pipe 11. . The oil that has flowed into the oil cooler 5 is cooled by the oil cooler 5, and is returned to the transmission 2 through the pipe 12 and the introduction port 2 b of the transmission 2. As a result, the returned oil contributes to the cooling of the transmission 2 in the transmission 2.

  After step S12 is executed, the pump drive control unit 81 determines whether or not the sensor value (oil temperature) from the temperature sensor 13 is equal to or lower than the end reference temperature (S13). As a result, when the oil temperature is not equal to or lower than the end reference temperature (S13: NO), since the oil is not sufficiently cooled, the pump drive control unit 81 repeatedly executes step S13.

  On the other hand, when the oil temperature is equal to or lower than the end reference temperature (S13: YES), since the oil is sufficiently cooled, the pump drive control unit 81 instructs the relay 7 to stop supplying power to the motor control unit 9. The relay 7 stops the supply of electric power to the motor control unit 9 according to the electric power supply stop instruction from the transmission ECU 8, ends the driving of the oil pump 42 (S14), and advances the process to step S11.

  Here, when the driving of the oil pump 42 is finished in step S14, the piping 10, the oil pump 42, the piping 11, the oil cooler 5, the piping until the oil temperature becomes equal to or higher than the start reference temperature (S11: YES). Oil will remain in 12. The oil remaining in this manner decreases in temperature and increases in viscosity over time, but when the temperature becomes equal to or higher than the start reference temperature, the oil pump 42 is driven by the above-described processing. The oil pump 42 can be appropriately driven and the oil can be appropriately supplied without being stepped out.

  As described above, according to the oil supply device according to the present embodiment, the target rotational speed is determined to be equal to or lower than the rotational speed during discharge until the predetermined time or more has elapsed from the start of the oil pump 42, and the power control unit 92 controls the electric power supplied to the motor 41 so as to rotate at the target rotational speed determined by the rotational speed determination unit 91. As a result, the oil pump 42 can be appropriately driven and oil can be supplied appropriately without causing the motor 41 to step out.

  In addition, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably and can implement.

  For example, in the above-described embodiment, the rotation speed determination unit 91 changes the target rotation speed in stages, but may change the target rotation speed continuously, for example.

  In the above embodiment, the end condition for ending the driving of the oil pump 42 is an example in which the oil temperature is equal to or lower than the end reference temperature. However, the present invention is not limited to this. For example, the oil pump The end condition may be that a predetermined time has elapsed since the start of the driving of 42.

Further, in the above embodiment, after the residual oil is discharged from the pipe 12, the target rotational speed of the motor 41 is set to the steady rotational speed _RS , but the present invention is not limited to this, and the nature of the oil, the motor 41, and the like. Even if some residual oil remains in the pipe 12 or the like due to the performance of the motor, the residual oil is completely discharged from the pipe 12 when the motor 41 does not step out or is unlikely to occur. The target rotational speed may be set to the steady-state rotational speed at a point in time when there is not.

  In the above embodiment, the oil supply device 3 circulates the oil of the transmission 2. However, the present invention is not limited to this, and for example, another device provided in the vehicle, for example, a differential You may make it circulate the oil of an apparatus (diff).

  In the above embodiment, the oil supply device 3 has the same oil supply source and oil supply destination (in the embodiment, the transmission 2). However, the present invention is not limited to this, and the oil supply source The oil supply device may be different from the device.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Transmission 3 Oil supply apparatus 4 Electric oil pump 5 Oil cooler 6 Battery 7 Relay 8 Transmission ECU
DESCRIPTION OF SYMBOLS 9 Motor control part 10, 11, 12 Piping 13 Temperature sensor 41 Motor 42 Oil pump 81 Pump drive control part 91 Speed determination part 92 Electric power control part

Claims (10)

An oil pump for supplying oil from a predetermined oil supply source to a predetermined oil supply destination;
A brushless motor for driving the oil pump;
When the supply of the oil by the oil pump is started, the rotational speed of the brushless motor is increased with time, and the rotational speed equal to or lower than the first rotational speed, which is lower than the steady rotational speed of the brushless motor. Motor control means for controlling to maintain for a predetermined time or more;
Having oil supply device. The oil supply apparatus according to claim 1, wherein the motor control unit increases the rotational speed of the brushless motor stepwise. 3. The oil supply device according to claim 1, wherein the motor control unit increases the rotational speed of the brushless motor toward the first rotational speed. 4. 4. The predetermined time is a time until at least all of the oil existing in a flow path from the oil pump to the oil supply destination is supplied to the oil supply destination before the operation of the brushless motor is started. The oil supply device described in 1. The oil supply device according to any one of claims 1 to 4, wherein the motor control unit controls the brushless motor to have a steady rotation speed after the predetermined time has elapsed. The oil supply device according to any one of claims 1 to 5, further comprising an oil cooling unit for cooling the oil supplied from the oil supply source. A temperature sensor for detecting the temperature of oil at the oil supply source;
The oil supply device according to claim 6, further comprising a pump drive control unit that controls to start the supply of the oil by the oil pump when the temperature of the oil becomes equal to or higher than a predetermined temperature. The oil supply device according to claim 7, wherein the pump drive control unit performs control so as to stop the supply of the oil by the oil pump when a predetermined operation end condition is satisfied. The oil supply device according to any one of claims 1 to 8, wherein the oil supply source and the oil supply destination are the same device. The oil supply apparatus according to any one of claims 1 to 9, wherein the oil supply source is a transmission that shifts and transmits power.

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