JP2012197843A - Controller for motor-driven oil pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make appropriate preparations for operation and determination on completion of the preparations for operation prior to a request for operation of a motor-driven oil pump to reduce time for the preparations for operation.SOLUTION: The motor-driven oil pump 10 for supplying oil to at least a part (a clutch 4) of a transmission 3 is juxtaposed with a mechanical oil pump 7 driven by an engine 1 to supply oil to each part of the transmission 3. Prior to the request for operation of the motor-driven oil pump 10, the motor-driven oil pump 10 is rotated at a first extremely low speed rotational frequency for preparations for operation to replace oil in oil pipes 11, 12 governed by the motor-driven oil pump 10. Then, the motor-driven oil pump 10 is rotated at a second relatively high speed rotational frequency for preparations for operation and when an actual rotational frequency satisfies the second rotational frequency for preparations for operation, it is determined that the preparations for operation are completed.

Description

  The present invention relates to a control device for an electric oil pump for a vehicle.

  The operation of the transmission mounted on the vehicle, and lubrication / cooling are performed by oil supply (hydraulic supply) by a mechanical oil pump driven by an internal combustion engine (engine) that is a power source of the vehicle.

  Here, when an idle stop function or the like is added to the engine, the mechanical oil pump is also stopped when the engine is automatically stopped. Therefore, depending on the model, the transmission is in a neutral state due to a decrease in hydraulic pressure. In this state, the engine is engaged when the hydraulic pressure is increased by restarting the engine, and vibration is generated because the engine speed is high. In addition, depending on the model, the supply of oil for lubrication / cooling to the clutch is stopped, so that the clutch is not sufficiently cooled, and the heat generation may be a problem.

  For this reason, an electric oil pump that is arranged in parallel with the mechanical oil pump and that can operate independently of the engine is provided. When the engine is stopped, oil supply (hydraulic supply) to necessary parts is performed by this electric oil pump. This is done (see Patent Document 1).

JP 2007-320353 A

  However, since the electric oil pump is basically stopped during engine operation, the oil in the oil piping governed by the electric oil pump remains and remains in the oil pan that flows frequently by the mechanical oil pump. The situation may be different from the oil temperature. For this reason, especially when operating at an extremely low temperature, when there is a request for operation of the electric oil pump, if the operation is attempted, the viscosity of the oil in the oil piping governed by the electric oil pump is high. In some cases, excessive resistance was received, making it impossible to meet operational requirements.

  In addition, prior to the operation request for the electric oil pump, it may be possible to rotate the electric oil pump and determine whether or not rotation at a performance-guaranteed rotation speed (rotation speed satisfying the performance-guaranteed flow rate) is possible. Since the guaranteed rotational speed is a relatively high rotational speed, it is difficult to rotate to a level that reaches the determination rotational speed at extremely low temperatures, and the time until the electric oil pump becomes operable cannot be shortened.

  In view of such a situation, it is an object of the present invention to perform appropriate operation preparation and operation preparation completion determination prior to an operation request for an electric oil pump, and to shorten the operation preparation time. .

  In order to solve the above-described problems, the present invention rotates the electric oil pump at the second operation preparation rotational speed prior to the operation request for the electric oil pump, and the actual rotational speed is set to the second operation preparation rotational speed. The electric oil pump is operated at the second operation preparation rotational speed on at least one condition that the operation preparation / determination mode in which it is determined that the operation preparation is completed and the operation preparation completion is determined. A low-speed operation preparation mode for rotating at a lower first operation preparation rotation speed.

  According to the present invention, prior to an operation request for the electric oil pump, the electric oil pump is rotated at the second operation preparation rotational speed for the operation preparation completion determination, and the operation preparation is completed when a desired rotation is obtained. By using this determination result, it is possible to permit the operation of the electric oil pump and hence the permission to perform idle stop, etc., and control that avoids difficulty in driving under excessive resistance Can do.

  In addition, by rotating the electric oil pump at the first operation preparation rotation speed lower than the second operation preparation rotation speed before determining that the operation preparation is completed, the oil in the oil pipe controlled by the electric oil pump is obtained. Thus, the temperature can be raised, thereby making it possible to clear the operation preparation completion determination at an early stage, shortening the operation preparation time, and promptly responding to subsequent operation requests.

1 is a schematic diagram of an oil supply system in a vehicle transmission that shows an embodiment of the present invention. Schematic showing an arrangement example of an electric oil pump and its oil piping Circuit diagram of motor and inverter constituting electric oil pump Electric oil pump operation preparation routine flowchart Diagram showing the behavior of pump rotation speed during operation preparation The flowchart of the operation preparation routine of the electric oil pump shown as other embodiment of this invention

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a schematic view of an oil supply system in a vehicle transmission apparatus showing an embodiment of the present invention.

An engine (internal combustion engine) 1 which is a power source of the vehicle has an idle stop function, and automatically stops the engine 1 by stopping fuel supply to the engine 1 under a predetermined idle stop condition. When the stop cancellation condition is satisfied, the fuel supply to the engine 1 is resumed and the engine 1 is restarted.
The output shaft of the engine 1 is connected to the transmission 3 via the torque converter 2.

The transmission 3 includes a clutch 4 and a continuously variable transmission 5.
The clutch 4 is constituted by a wet multi-plate clutch, and the engagement / release is controlled by hydraulic control of hydraulic oil.

  In addition, the clutch 4 here is a friction engagement element in the forward / reverse switching mechanism in detail. The forward / reverse switching mechanism includes, for example, a ring gear connected to the engine output shaft, a pinion and a pinion carrier, a planetary gear mechanism including a sun gear connected to the transmission input shaft, a reverse brake that fixes the transmission case to the pinion carrier, A forward clutch that connects the transmission input shaft and the pinion carrier, and switches between forward and reverse of the vehicle. In this case, the forward clutch and the reverse brake, which are friction engagement elements in the forward / reverse switching mechanism, correspond to the clutch 4.

  The continuously variable transmission 5 includes a primary pulley 5a and a secondary pulley 5b, and a belt 5c wound between these pulleys. The rotation of the primary pulley 5a is transmitted to the secondary pulley 5b via the belt 5c, and the secondary pulley 5b The rotation of the pulley 5b is transmitted to drive wheels (not shown).

  In the continuously variable transmission 5, the movable conical plate of the primary pulley 5a and the movable conical plate of the secondary pulley 5b are moved in the axial direction by hydraulic control of the respective hydraulic oil, and the pulleys 5a, 5b and belts are moved. By changing the contact position radius with 5c, the pulley ratio (rotation ratio) of the primary pulley 5a and the secondary pulley 5b can be changed, and the gear ratio can be changed steplessly.

  Oil is stored in the oil pan 6 at the bottom of the case of the transmission 3, and this oil is sucked and pressurized by the mechanical oil pump 7, and each of the clutch 4 and the pulleys 5 a and 5 b is connected via the pressure adjusting mechanism 8. Supplied as hydraulic oil to the hydraulic actuator.

  The mechanical oil pump 7 is provided in the case of the transmission 3 and is driven by the input shaft of the transmission 3. Accordingly, the mechanical oil pump 7 is substantially driven by the engine 1 which is a power source.

  The pressure adjusting mechanism 8 includes an electromagnetic valve having a relief function for each supply part (clutch 4 and pulleys 5a and 5b), and is controlled by a control unit (C / U) 20 including a microcomputer. The discharge pressure of the mechanical oil pump 7 is adjusted to the target pressure of each supply part and supplied to each supply part. Thereby, the forward / reverse switching of the vehicle and the control of the gear ratio are performed.

  The mechanical oil pump 7 supplies oil as hydraulic oil to the clutch 4 and the pulleys 5 a and 5 b through the pressure adjusting mechanism 8, and supplies lubricating and cooling oil to each part of the transmission 3. The supplied oil is returned to the oil pan 6 and circulated.

On the other hand, an electric oil pump 10 is provided in parallel with the mechanical oil pump 7 driven by the engine 1 as a power source.
The electric oil pump 10 is provided to supply cooling oil to the clutch 4 in order to reduce the generation of frictional heat in the clutch 4 while the engine 1 is stopped, and thus the mechanical oil pump 7 is stopped. .

  FIG. 2 shows an arrangement example of the electric oil pump and its oil piping, which will be described below with reference to FIGS. 1 and 2.

  The electric oil pump 10 includes a pump unit (10), a motor M that drives the pump unit (10), and an inverter INV that performs PWM control of the motor M under the control of the control unit 20.

  The electric oil pump 10 is provided outside the case of the transmission 3, sucks oil from the oil pan 6 at the bottom of the case through the suction pipe 11, and cools the clutch 4 in the case through the discharge pipe 12. Supply oil for use. Therefore, the discharge pipe 12 is routed around the case of the transmission 3, that is, around the housing 4H of the clutch 4, and is connected to the oil inlet 13 formed in the housing 4H.

  An oil passage (not shown) for guiding oil from the oil inlet 13 to the central portion of the housing is provided in the housing 4H, and the oil supplied to the central portion of the housing is supplied to each portion by centrifugal force.

  FIG. 3 shows a circuit configuration of the motor M and the inverter INV constituting the electric oil pump 10.

  As the motor M, a three-phase brushless motor is used. This is composed of an inner rotor attached to a rotating shaft and embedded with a plurality of permanent magnets, and an outer stator formed by winding a three-phase (U-phase, V-phase, W-phase) coil. The rotor is rotated by a magnetic field generated by a current supplied to the coil. In FIG. 3, the motor M is simplified and shown as a U-phase, V-phase, and W-phase coil.

  The inverter INV converts the power supply voltage (DC voltage) into an AC voltage and supplies it to the motor M by PWM control (control for generating a voltage whose pulse width is modulated at a constant period in order to obtain a pseudo sine wave). In this configuration, a U-phase arm, a V-phase arm, and a W-phase arm are provided in parallel between the power supply VB side and the ground GND side.

  The U-phase arm includes two switching elements Q1 and Q2 in series. The V-phase arm also includes two switching elements Q3 and Q4 in series. The W-phase arm also includes two switching elements Q5 and Q6 in series.

  The intermediate point of each U, V, W phase arm is connected to the other end of each U, V, W phase coil that is star-connected at each end of the motor M. That is, the intermediate point of the switching elements Q1, Q2 of the U-phase arm is connected to the U-phase coil, the intermediate point of the switching elements Q3, Q4 of the V-phase arm is connected to the V-phase coil, and the switching element Q5 of the W-phase arm An intermediate point of Q6 is connected to the W-phase coil.

  Therefore, the control unit 20 adjusts the ratio of the ON period of the switching element on the power supply VB side and the ON period of the switching element on the ground GND side according to the sine wave voltage to each phase of U, V, and W. By controlling, a pseudo AC voltage can be obtained and the motor M can be driven.

  The control unit 20 has a potential difference ΔV between both ends of a current detection resistor (resistance value R) 21 provided on a common line on the ground GND side of each U, V, W phase arm for driving control of the motor M. Is input via the detector 22, and based on this, the pump current Ip = ΔV / R is detected. Further, the potentials Vu, Vv, Vw at the intermediate points of the U, V, W phase arms are also detected and input.

  In the oil supply system for a vehicle transmission as described above, oil is supplied to each part of the transmission 3 by the mechanical oil pump 7 during operation of the engine 1, and the engine 1 is stopped under an idle stop condition. Accordingly, when the mechanical oil pump 7 is stopped, an operation request is issued to the electric oil pump 10, and cooling oil is supplied to the clutch 4 by the electric oil pump 10, so that the clutch 4 generates heat. It is preventing.

  The electric oil pump 10 has a performance-guaranteed oil temperature (for example, −25 ° C.), and the performance is guaranteed at an oil temperature higher than this. Therefore, it is desirable to prohibit the idle stop so that the operation request is not issued to the electric oil pump 10 below the performance guarantee oil temperature.

As an oil temperature detecting means, an oil temperature sensor 30 (see FIG. 1) is usually provided in the oil pan 6.
However, the oil temperature in the oil pipe (suction pipe 11 and discharge pipe 12) governed by the electric oil pump 10 may be significantly different from the oil temperature in the oil pan 6.

  This is because the electric oil pump 10 is basically stopped during the operation of the engine 1, so that the oil in the oil pipes 11 and 12 governed by the electric oil pump 10 remains, and the mechanical oil pump 7 This is because the oil temperature in the oil pan 6 that flows frequently is different.

  Moreover, since the electric oil pump 10 in this embodiment is disposed outside the case of the transmission 3, and the oil pipes 11 and 12 governed by the electric oil pump 10 are also routed outside the case of the transmission 3, Even if the inside of the case of the transmission 3 is warmed due to the warm-up of the engine 1 and the transmission 3, the electric oil pump 10 and its oil pipes 11, 12 remain exposed to the outside air. It remains in a cryogenic environment.

  Therefore, when the first pump operation request is issued during the warm-up after the start in the cold region in winter, the oil viscosity in the oil pipes 11 and 12 governed by the electric oil pump 10 is high. In some cases, M receives an excessive load and cannot respond to the operation request.

  Therefore, the engine 1 is stopped by the idle stop function, and the mechanical oil pump 7 is also stopped, so that when the operation request is issued to the electric oil pump 10, the reliable operation at the normal rotation speed is ensured. Therefore, preparation for operation of the electric oil pump 10 is performed prior to the operation request.

  First, the electric oil pump 10 is rotated for a predetermined time at the first low speed operation preparation speed (low speed operation preparation mode). That is, the electric oil pump 10 is rotated at a very low speed over time so as not to become an excessive load, and the relatively warm oil in the oil pan 6 is caused to flow into the oil pipes 11 and 12, so that the oil pipes 11 and 12 The oil in the oil pipes 11 and 12 is raised.

  Here, the first operation preparation rotation speed is set together with the predetermined time (rotation time) so as to obtain a flow rate necessary for replacing the oil in the pipe. However, the pump current is reduced and the load can be reduced. Therefore, it is necessary to determine the balance between time and load. In addition, the electric oil pump 10 has a minimum pump clearance and a maximum pump clearance (small friction) within the pump tolerance range. Therefore, when considering the oil replacement time, the pump By using the one with the maximum clearance (maximum leakage) as a standard, oil can be thoroughly replaced. On the other hand, when considering the load, the pump clearance can be set to the safe side based on the minimum pump clearance (large friction).

  Next, in order to determine that the operation preparation by oil replacement has been completed, the electric oil pump 10 is rotated at a relatively high second operation preparation rotation speed, and the actual rotation speed is set to the second operation preparation rotation speed. When it is satisfied, it is determined that the operation is ready (operation preparation / determination mode). Then, the idle stop is permitted after the operation preparation completion determination.

  The low-speed operation preparation mode and the operation / preparation judgment mode are basically (1) low-speed operation preparation mode and (2) operation preparation / judgment mode in this order, and it is not possible to determine that the operation preparation is complete. If this is the case, repeat these steps in the order of (1) and (2). However, if it is not in the cold state (in the case of the warm-up completion state), first execute the relatively high-speed operation preparation / judgment mode to prepare for operation. If the completion is not determined, the low-speed operation preparation mode may be performed, and then the operation preparation / determination mode may be performed again. Regardless of whether the engine is in a cold state or in a warm-up state, priority is given to shortening the time, and a relatively high-speed operation preparation / judgment mode is implemented first, and it is not possible to determine that operation preparation is complete. In this case, the low-speed operation preparation mode may be performed, and then the operation preparation / determination mode may be performed again.

  FIG. 4 is a flowchart of an operation preparation routine of the electric oil pump 10 executed by the control unit 20. This routine is executed immediately after the power is turned on, and is thereafter executed every predetermined time. FIG. 5 shows the behavior of the pump speed at the time of preparation for operation, and will be referred to together.

  In S1, it is determined whether or not a predetermined operation preparation start condition is satisfied. The operation preparation start condition here is basically the case where the operation preparation of the electric oil pump 10 is not completed immediately after the power is turned on (when the operation preparation completion flag = 0). In addition, although the operation preparation completion flag = 1, after completion of the previous operation preparation, a predetermined time or more has passed without an operation request for the electric oil pump 10, or after the operation request for the previous electric oil pump 10, This also applies to cases where time has passed and the outside air temperature detected by the outside air temperature sensor is below a predetermined value.

  In addition, the conditions for starting operation preparation at extremely low temperatures are as follows. That is, when the oil temperature detected by the oil temperature sensor 30 in the oil pan 6 is lower than the performance-guaranteed oil temperature (for example, −25 ° C.) of the electric oil pump 10 (for example, at −30 ° C.), After confirming an increase in the oil temperature due to the start of rotation of the input shaft of the apparatus 3 or an increase in the oil temperature due to the oil warmer using engine cooling water, a predetermined temperature (for example, −27) lower than the performance-guaranteed oil temperature is confirmed. When the temperature reaches -28 ° C., the operation preparation start condition is satisfied.

  If such an operation preparation start condition is satisfied, the operation preparation completion flag is reset if necessary, and then the operation proceeds to S2 for operation preparation. If the operation preparation start condition is not satisfied, the process is terminated.

  In S2, it is determined whether or not it is in a cold state (before completion of warm-up). This is performed by comparing the oil temperature detected by the oil temperature sensor 30 in the oil pan 6 with a predetermined value. In this determination, if it is in the cold state, the process proceeds to S3, and if not, the process proceeds to S5. This is performed in the order of (1) low speed operation preparation mode (S3, S4), (2) operation preparation / judgment mode (S5 to S7) in the cold state, and operation preparation / This is to precede the determination mode (S5 to S7).

  Operation preparation in the order of (1) low-speed operation preparation mode (S3, S4) and (2) operation preparation / determination mode (S5 to S7) in the cold state will be described.

  In S3, the target rotation speed of the electric oil pump 10 is set to the first operation preparation rotation speed (operation preparation rotation speed 1), and a rotation command 1 is given. The first operation preparation rotation speed is sufficiently lower than a second operation preparation rotation speed described later (set to a rotation speed that satisfies the performance-guaranteed flow rate), for example, 500 rpm.

  In S4, it is determined whether or not a predetermined time (for example, 15 seconds) has elapsed from the rotation command 1, and when the predetermined time has elapsed, the process proceeds to S5.

  In S5, the target rotation speed of the electric oil pump 10 is set to the second operation preparation rotation speed (operation preparation rotation speed 2), and a rotation command 2 is given. The second operation preparation rotation speed is set to be equal to or higher than the rotation speed satisfying the performance guarantee flow rate, and is sufficiently higher than the first operation preparation rotation speed, for example, 1200 rpm.

  In S6, it is determined whether or not the actual rotational speed ≧ the predetermined rotational speed is established within the predetermined time 2 from the rotation command 2. Here, the predetermined rotational speed is a rotational speed that is close to the second operation preparation rotational speed and satisfies the performance-guaranteed flow rate. In this determination, when the actual rotational speed ≧ the predetermined rotational speed is established within the predetermined time 2, the process proceeds to S7 at the time of establishment, and when the actual rotational speed ≧ the predetermined rotational speed is not satisfied even after the predetermined time 2 has passed, At that time, the process returns to S3.

  In S7, it is determined whether or not this state has been continued for a predetermined time 3 after establishment of the actual rotational speed ≧ the predetermined rotational speed. In this determination, if the actual rotational speed ≧ the predetermined rotational speed is continued for the predetermined time 3, the process proceeds to S <b> 8 at the continuing time, and if the actual rotational speed ≧ the predetermined rotational speed cannot be continued, the predetermined rotational speed is interrupted. Return to S3.

  Thus, after the rotation command 2 at the second operation preparation rotation speed, the actual rotation speed reaches the predetermined rotation speed in the vicinity of the second operation rotation speed within the predetermined time 2 in S6 and S7, and the actual rotation When the state of number ≧ predetermined number of revolutions is continued for a predetermined time of three, it is considered that the second operation preparation revolution number is satisfied, and the process proceeds to S8 and S9.

In S8, in order to end the operation preparation work, the target rotational speed is set to 0 and a stop command is given.
In S9, it is determined that the operation preparation is completed, and the operation preparation completion flag is set to 1. By setting the operation preparation completion flag, normal operation of the electric oil pump 10 is permitted, and idle stop is also permitted.

  On the other hand, when it is determined in S6 that the actual rotational speed ≧ the predetermined rotational speed is not satisfied even if the predetermined time 2 elapses, or the actual rotational speed ≧ the predetermined rotational speed cannot be continued for the predetermined time 3 in the determination in S7. Returns to S3 and S4. That is, the low-speed operation preparation mode (S3, S4) at the first operation preparation rotational speed on the low speed side is retried. Then, after that, the operation preparation / judgment mode (S5 to S7) at the second operation preparation rotational speed on the high speed side is retried.

  Next, the operation preparation in which the operation preparation / determination mode (S5 to S7) in the warm-up completion state is preceded will be described.

  In the case of the warm-up completion state, the process proceeds to S5 by the determination in S2, and the operation preparation / determination mode (S5 to S7) at the second high-speed operation preparation rotation speed is performed in advance. When it is determined in this operation preparation / determination mode that the operation preparation is completed, the operation preparation is completed (S8), and the operation preparation completion flag is set (S9). Therefore, in this case, the low speed operation preparation mode (S3, S4) at the first operation preparation rotational speed on the low speed side can be omitted, and the operation preparation time can be greatly shortened.

  When the operation preparation completion determination is not obtained in the operation preparation / determination mode (S5 to S7) (No in S6 or S7), the low-speed operation preparation mode (first operation preparation rotation speed on the low speed side) Steps S3 and S4) are performed, and then the operation preparation / determination mode (S5 to S7) at the second operation preparation rotation speed on the high speed side is retried.

FIG. 6 is a flowchart of an operation preparation routine of the electric oil pump 10 shown as another embodiment of the present invention. This routine is also executed immediately after the power is turned on, and is thereafter executed every predetermined time.
In the flowchart of FIG. 6, steps having the same contents as those in the flowchart of FIG.

  If the operation preparation start condition is satisfied in the determination in S1, the process proceeds to S5 regardless of whether the engine is in the cold state or in the warm-up completion state (S2 in the flowchart of FIG. 4 is abolished). That is, the operation preparation / determination mode (S5 to S7) at the second operation preparation rotation speed on the high speed side is executed in advance.

  When it is determined in this operation preparation / determination mode that the operation preparation is completed, the operation preparation is completed (S8), and the operation preparation completion flag is set (S9). Therefore, in this case, the low speed operation preparation mode (S3, S4) at the first operation preparation rotational speed on the low speed side can be omitted, and the operation preparation time can be greatly shortened.

  When the operation preparation completion determination is not obtained in the operation preparation / determination mode (S5 to S7) (No in S6 or S7), the low-speed operation preparation mode (first operation preparation rotation speed on the low speed side) Steps S3 and S4) are performed, and then the operation preparation / determination mode (S5 to S7) at the second operation preparation rotation speed on the high speed side is retried.

  Although not shown in the flowchart (FIG. 4 or FIG. 6), when a failure signal is generated in the system of the electric oil pump 10 during operation preparation (during low speed operation preparation mode and operation preparation / judgment mode), Forced operation preparation. Further, by repeating the operation preparation operation, when the temperature of the electric oil pump 10 rises due to heat generation and an overtemperature is detected, the electric oil pump 10 is set in a protection (protection) state, the electric oil pump 10 is stopped, and the temperature drop is waited. When the temperature drops, the protection state is released. In addition, the rotation of the electric oil pump 10 for preparation for operation is stopped under various preset conditions. However, as long as there is no problem, it is desirable to continue preparation for operation in order to ensure oil supply performance.

  According to the present embodiment, prior to an operation request for the electric oil pump 10, the electric oil pump 10 is rotated at the second operation preparation rotation speed, and the actual rotation speed satisfies the second operation preparation rotation speed. The electric oil pump 10 is set to the second condition on the basis of at least one condition that the operation preparation / determination mode (operation preparation / determination means) for determining that the operation is ready and that the operation preparation is completed are determined. The following effects (1) and (2) are obtained by the configuration including the low-speed operation preparation mode (low-speed operation preparation means) that rotates at the first operation preparation rotation speed lower than the operation preparation rotation speed.

  (1) Prior to an operation request for the electric oil pump 10, the electric oil pump 10 is rotated at the second operation preparation rotational speed for the operation preparation completion determination, and when the desired rotation is obtained, the operation preparation is completed. By making the determination, it is possible to permit the operation of the electric oil pump 10 and hence the execution of the idling stop by using this determination result, and to make the control avoiding difficulty in driving under excessive resistance. Can do.

  (2) The oil pipe controlled by the electric oil pump 10 by rotating the electric oil pump 10 at the first operation preparation rotation speed lower than the second operation preparation rotation speed before determining that the operation preparation is completed. 11 and 12 can be exchanged to raise the temperature, thereby making it possible to quickly clear the operation preparation completion determination, shortening the operation preparation time, and promptly responding to subsequent operation requests.

  In particular, as a basic aspect, in the order of the low-speed operation preparation mode, the operation preparation / judgment mode, and when the determination that the operation preparation is complete is not obtained, by repeating these in order, the following effects are obtained. Is obtained.

  By first implementing the low-speed operation preparation mode, the electric oil pump 10 rotates at the first low-speed operation preparation rotation speed, and the oil pipes 11 and 12 controlled by the electric oil pump 10 have oil pans. The relatively warm oil in 6 is supplied and the oil remaining in the oil pipes 11 and 12 is pushed out, so that the oil is replaced.

  At this time, since the electric oil pump 10 is rotated at a very low speed over time, the load of the motor M is not excessive. Moreover, even if preparation for operation is performed immediately after starting at a cryogenic temperature, the power consumption is small due to extremely low speed rotation.

  Then, the oil temperature in the oil pipes 11 and 12 rises due to the oil replacement, and the viscosity decreases, whereby high-speed rotation is possible and motor step-out can be reduced. Therefore, the operation preparation / determination mode can be easily implemented, and the operation preparation completion determination can be cleared early.

  Then, after determining that the operation preparation is complete, the operation at the normal rotation speed of the electric oil pump 10 is permitted, and the idling stop is permitted, so that the electric oil pump 10 with respect to the electric oil pump 10 is related to the idle stop control before the operation preparation is completed. It is possible to avoid issuing an operation request.

  In addition, using the means (oil temperature sensor 30) for detecting the cold state (or the warm-up completion state) of the transmission 3, in the cold state, the low-speed operation preparation mode and the operation preparation / judgment mode are performed in this order, and the operation preparation is completed. If it is not possible to determine whether the operation is ready, if it is not in the cold state, the relatively high-speed operation preparation / determination mode is implemented first and the operation preparation is not completed. In addition, by implementing the low-speed operation preparation mode and then the operation preparation / judgment mode again, the operation preparation time can be reliably shortened when the engine is not in the cold state (in the case of the warm-up completion state). Can do. On the other hand, in the cold state, the oil viscosity is high, the pump load becomes large, and it is expected that the second operation preparation rotation speed (determination rotation speed) in the operation preparation / determination mode cannot be maintained. By making the operation preparation mode precede, it is possible to prevent the operation preparation time from being prolonged due to re-determination.

  Regardless of whether the engine is in a cold state or in a warm-up state, a relatively high-speed operation preparation / judgment mode is implemented first. By implementing the mode, and then the operation preparation / judgment mode again, that is, when the operation preparation completion determination is prioritized and it is difficult to determine that the operation preparation is complete, the speed is low. By implementing the operation preparation mode, the operation preparation time can be shortened with simple control.

Next, the implementation conditions of the operation preparation control will be further described.
When the power supply voltage becomes less than a predetermined value at the time of driving request for preparing the operation of the electric oil pump or during driving, the driving is stopped or suppressed. At this time, the threshold may be increased when the outside air temperature is low due to the characteristics of the battery.

  That is, the power supply of this system is commonly used for engine start, and when it is expected that the next start will be difficult, the drive is stopped. This is because, particularly during idle stop, it is usually restarted after that, but this restart becomes difficult. Here, during engine rotation, power is supplied from the alternator, and the state of the battery (such as when the discharge is considerably deep at low temperature start) is often difficult to understand, and it is easy to do appropriately if judged by the voltage state after idle stop.

  When the demand of the supply destination of the electric oil pump is high, for example, an emergency is required, it is driven regardless of the pump operation permission condition or relaxed. At this time, the abnormality determination of the work relationship (current vs. supply amount, etc.) is eased or stopped.

  That is, in the case of a high load start such as starting uphill in a towed state at a very low temperature, the start clutch may be in a dangerous temperature state even if the outside air temperature, oil temperature, etc. are low. Or drive with relaxation. At this time, since normal work-related diagnosis is highly likely to be an abnormal value due to high-viscosity oil, friction at each part, etc., the diagnosis is relaxed (for example, the threshold is changed) or the diagnosis is stopped.

  The illustrated embodiments are merely examples of the present invention, and the present invention is not limited to those directly described by the described embodiments, and various improvements and modifications made by those skilled in the art within the scope of the claims. Needless to say, it encompasses changes.

  For example, in the illustrated embodiment, the electric oil pump 10 is configured to supply cooling oil to the clutch 4 of the transmission 3, but is not limited thereto, and at least a part of the transmission 3 A configuration may be adopted in which oil is supplied as working hydraulic pressure or for lubrication / cooling.

  In the illustrated embodiment, the discharge side pipes of the mechanical oil pump 7 and the electric oil pump 10 are completely separated from each other. However, they may be joined together while preventing backflow by a check valve or the like. . However, in this case, it is necessary to set the rotation speed so that the discharge pressure of the electric oil pump 10 exceeds the valve opening pressure of the check valve or the like.

DESCRIPTION OF SYMBOLS 1 Engine 2 Torque converter 3 Transmission 4 Clutch 4H Housing 5 Continuously variable transmission 5a Primary pulley 5b Secondary pulley 5c Belt 6 Oil pan 7 Mechanical oil pump 8 Pressure regulation mechanism 10 Electric oil pump (M: motor, INV: inverter)
11 Intake pipe 12 Discharge pipe 13 Oil inlet 20 Control unit 21 Current detection resistor 22 Detector 30 Oil temperature sensor

Claims (1)

A control device for an electric oil pump, which is provided in parallel with a mechanical oil pump that is driven by an internal combustion engine that is a power source of a vehicle and supplies oil to a transmission of the vehicle, and supplies oil to at least a part of the transmission. There,
Prior to the operation request for the electric oil pump, the electric oil pump is rotated at the second operation preparation rotation speed, and the operation preparation is determined to be complete when the actual rotation speed satisfies the second operation preparation rotation speed. Preparation / judgment mode
A low-speed operation preparation mode in which the electric oil pump is rotated at a first operation preparation rotation speed lower than the second operation preparation rotation speed on the condition that the determination that the operation preparation completion is made is at least one condition. When,
A control device for an electric oil pump, comprising: