JP2013068234A - Control device of electric oil pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To optimize the warming operation of an electric oil pump.SOLUTION: The electric oil pump disposed in parallel to a mechanical oil pump driven by an engine is current-feedback controlled at a predetermined target current in response to a warming instruction for the electric oil pump. When a state where the motor rotating speed of the electric oil pump has reached a control switching rotating speed N1 is continued for a predetermined time t1, the electric oil pump is rotation-feedback controlled at a predetermined target rotating speed. When a state where the motor rotating speed has reached a warming completion rotating speed N2 is continued for a predetermined time t3, the warming operation of the electric oil pump is terminated. When the motor rotating speed does not reach the warming completion rotating speed N2 even if the rotation feedback control is continued for a predetermined time t2, the warming operation is started over again.

Description

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

  An automatic transmission or the like mounted on a vehicle uses oil supplied from an engine-driven mechanical oil pump to perform operation of each element and cooling / lubrication of a movable part. Here, if the vehicle is equipped with an idle stop function that stops the engine when the vehicle is stopped, the hydraulic pressure of the oil supplied to the automatic transmission or the like when the engine is stopped decreases. For example, the automatic transmission is shifted to neutral, There is a risk of insufficient cooling of the transmission. For this reason, as described in Japanese Patent Application Laid-Open No. 2007-320353 (Patent Document 1), there is a technique in which an electric oil pump is arranged in parallel with a mechanical oil pump and oil can be supplied while the engine is stopped. Proposed.

JP 2007-320353 A

  By the way, in a cold machine state where the temperature of the oil (oil temperature) is low, the viscosity of the oil is large, and therefore, when the electric oil pump is started, an excessive load may be applied to the motor. Therefore, it may be possible to allow the electric oil pump to start when the oil temperature in an automatic transmission or the like rises to a predetermined temperature. However, there is no oil flow in the pump section before the electric oil pump is started. In some cases, the oil temperature of the pump unit does not rise to a predetermined temperature. For this reason, before permitting the activation of the electric oil pump, it is preferable to perform a “warm-up operation” in which the oil in the pump unit is replaced by operating the electric oil pump for a predetermined time.

  However, when the oil temperature rise is slow, even if the warm-up operation is performed for a predetermined time, the oil temperature of the pump portion of the electric oil pump does not rise to the predetermined temperature, and the start-up is permitted with the warm-up operation being insufficient. There was a risk of it. Also, if the oil temperature rises quickly, the oil temperature of the pump part of the electric oil pump rises to a predetermined temperature even if the warm-up operation is not performed for a predetermined time, and the power required for the warm-up operation is wasted. There was a risk of it.

  In view of the above-described problems of the prior art, an object of the present invention is to provide an electric oil pump control device that optimizes warm-up operation.

  In response to a warm-up command of an electric oil pump disposed in parallel with a mechanical oil pump driven by the engine, a warm-up operation for starting the electric oil pump according to a rotational load is started. Then, when the rotation speed of the electric oil pump reaches the first target rotation speed, the warm-up operation is terminated.

  The warm-up operation can be optimized.

It is a system diagram of a hydraulic transmission mechanism. It is a control block diagram for controlling an electric oil pump. It is a detailed view of a motor operation amount calculation unit. It is a flowchart which shows the control content of an electric oil pump. It is a flowchart which shows the control content of an electric oil pump. It is explanatory drawing of the warm-up operation of an electric oil pump.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows an example of a hydraulic transmission mechanism according to this embodiment.
A continuously variable transmission 18 is connected to the output shaft 12 of the engine 10 mounted on the vehicle via a torque converter 14 and a forward / reverse switching mechanism 16.

  The forward / reverse switching mechanism 16 includes, for example, a ring gear, a pinion and a pinion carrier connected to the output shaft 12 of the engine 10, a planetary gear mechanism having a sun gear connected to the transmission input shaft 20, and a transmission case fixed to the pinion carrier. And a reverse clutch that connects the transmission input shaft 20 and the pinion carrier. The forward / reverse switching mechanism 16 switches between forward and backward movement of the vehicle by switching between the reverse brake and the forward clutch using the hydraulic oil common to the continuously variable transmission 18.

  The continuously variable transmission 18 includes a primary pulley 22 and a secondary pulley 24, and a belt 26 spanned between these pulleys. The rotation of the primary pulley 22 is transmitted to the secondary pulley 24 via the belt 26, and the rotation of the secondary pulley 24 is transmitted to the drive wheels so that the vehicle travels.

  The continuously variable transmission 18 moves the movable conical plate of the primary pulley 22 and the movable conical plate of the secondary pulley 24 in the axial direction to change the contact position radius with the belt 26, thereby changing the primary pulley 22 and the secondary pulley. 24, that is, the gear ratio can be continuously changed.

  In the speed change mechanism 28 including the forward / reverse switching mechanism 16 and the continuously variable transmission 18, the pressure adjusting mechanism 30 adjusts the oil as the working oil to the target pressure of each part of the speed change mechanism 28, and the adjusted oil is changed back and forth. By supplying the forward change mechanism 16 and the continuously variable transmission 18 (the primary pulley 22 and the secondary pulley 24), the forward / reverse switching of the vehicle and the change of the gear ratio are performed. The pressure adjusting mechanism 30 also supplies the oil after pressure adjustment to the cooling / lubricating system 32.

  As an oil pump for supplying oil to the pressure adjusting mechanism 30, a mechanical oil pump 34 driven by the engine 10 and an electric oil pump 36 disposed in a passage bypassing the mechanical oil pump 34 are arranged in parallel. Is provided.

  The mechanical oil pump 34 and the electric oil pump 36 suck up the oil in the oil pan 38 and supply it to the pressure adjusting mechanism 30. The oil supplied from the pressure adjusting mechanism 30 to the forward / reverse switching mechanism 16, the continuously variable transmission 18, and the cooling / lubricating system 32 is returned to the oil pan 38 and circulated.

  The oil supply from the mechanical oil pump 34 and the electric oil pump 36 to the transmission mechanism 28 is at least one of supply as hydraulic oil for pulleys, clutches, brakes, supply for cooling, and supply for lubrication. One may be sufficient and it can also serve as some of hydraulic oil, cooling, and lubrication.

  The oil supply to the cooling / lubricating system 32 of the transmission mechanism 28 may be performed without the pressure adjusting mechanism 30, and the forward / reverse switching mechanism 16, continuously variable transmission 18, cooling / lubricating system 32 may be used. The transmission mechanism 28 may be configured to control the supply flow rate of oil to each of the components, and the pressure regulation mechanism 30 is not provided.

  The electric oil pump 36 is rotationally driven by various motors 40 such as a brushless motor. In the electric oil pump 36, the oil discharge amount and the discharge pressure are controlled by controlling the energization to the motor 40. A check valve 42 is disposed in the outlet passage of the electric oil pump 36 to prevent the backflow of oil discharged from the mechanical oil pump 34.

  In order to control the pressure regulating mechanism 30 of the transmission mechanism 28, a transmission control device 44 incorporating a computer is provided. The transmission control device 44 inputs various sensor output signals indicating the driving state of the vehicle, determines the shift control content based on these sensor output signals, and supplies the control signal corresponding to the shift control content to the pressure adjusting mechanism. Output to 30. Here, in order to detect the driving state of the vehicle, for example, an oil temperature sensor 46 for detecting the oil temperature of the oil pan 38 is provided.

  In order to control the motor 40 of the electric oil pump 36, an oil pump control device 48 incorporating a computer is provided. The oil pump control device 48 controls the amount of discharge and the discharge pressure of the electric oil pump 36 by controlling energization to the motor 40. Here, the oil pump control device 48 is connected to the transmission control device 44 via an in-vehicle network 50 such as a CAN (Controller Area Network) in order to receive various commands from the transmission control device 44. .

  Since the mechanical oil pump 34 is driven by the engine 10, for example, when the engine 10 is temporarily stopped by the idle stop function, the mechanical oil pump 34 is also stopped and the oil supply to the transmission mechanism 28 is interrupted. Therefore, when the engine 10 is temporarily stopped by the idle stop function, oil is supplied to the transmission mechanism 28 by the electric oil pump 36.

  Even when the engine 10 is in operation, the electric oil pump 36 may be operated in order to compensate for the insufficient supply of cooling oil or lubricating oil by the mechanical oil pump 34. The generation of the request is not limited to the temporary stop of the engine 10. The mechanical oil pump 34 and the electric oil pump 36 may be configured to supply oil to mutually independent supply paths. Further, a transmission control device 44, an engine control device that controls the engine 10, and the like may be provided. The electric oil pump 36 may be controlled.

FIG. 2 shows a control block for controlling the electric oil pump 36.
The transmission control device 44 includes a warm-up command unit 44A, an operation command unit 44B, and a target operation amount calculation unit 44C.

  The warm-up command unit 44A determines, for example, whether or not the warm-up operation of the electric oil pump 36 should be performed based on the oil temperature detected by the oil temperature sensor 46, and the oil pump control device according to the determination result. A warm-up command is output to 48. The warm-up command is output only when the warm-up operation completion flag described later is not set.

  For example, when the engine 10 is temporarily stopped by the idle stop function in a state where the warm-up operation completion flag is set, the operation command unit 44B is configured to switch the electric oil pump 36 to ensure oil supply to the transmission mechanism 28. The operation command is output to the target operation amount calculation unit 44C.

  The target operation amount calculation unit 44C calculates a target operation amount (target rotation speed, target current) of the motor 40 that rotationally drives the electric oil pump 36, triggered by the operation command from the operation command unit 44B. Specifically, the target operation amount calculation unit 44C is electrically driven according to output signals (vehicle speed, brake operation, accelerator opening, shift position, oil temperature, engine speed, battery voltage, etc.) from various sensors of the vehicle. The target operation amount of the motor 40 that rotationally drives the oil pump 36 is calculated. Then, the target operation amount calculation unit 44C outputs the calculated target operation amount to the oil pump control device 48.

  The oil pump control device 48 includes a warm-up control unit 48A, a target current calculation unit 48B, a target rotation number calculation unit 48C, a power supply current calculation unit 48D, a current feedback (F / B) control unit 48E, a motor An operation amount calculation unit 48F, a motor rotation number calculation unit 48G, and a rotation feedback control unit 48H are provided.

  The warm-up control unit 48A instructs the target current calculation unit 48B to calculate the target current for the warm-up operation when triggered by the warm-up command from the warm-up command unit 44A of the transmission control device 44. Then, it instructs the target rotational speed calculation unit 48C to calculate the target rotational speed of the warm-up operation.

  The target current calculation unit 48B calculates a target current for current feedback control of the motor 40 in response to an instruction from the warm-up control unit 48A. Here, the target current takes, for example, a current value that does not affect the drive circuit 52 and the like even when the motor 40 of the electric oil pump 36 is operated for a long time. When the target operation amount is output from the target operation amount calculation unit 44C of the transmission control device 44, the target current calculation unit 48B sets the target current according to the target operation amount.

  The target rotational speed calculation unit 48C calculates a target rotational speed for rotational feedback control of the motor 40, triggered by an instruction from the warm-up control unit 48A. Here, the target rotational speed is, for example, the rotational speed when the electric oil pump 36 is operated at a rating. When the target operation amount is output from the target operation amount calculation unit 44C of the transmission control device 44, the target rotation number calculation unit 48C sets the target rotation number according to the target operation amount.

The power supply current calculation unit 48D calculates, for example, a power supply current (actual current) actually applied to the motor 40 based on an output signal from an ammeter installed in the motor 40.
The current feedback control unit 48E calculates a deviation (current deviation) between the target current calculated by the target current calculation unit 48B and the actual current calculated by the power supply current calculation unit 48D, and outputs a signal corresponding to the current deviation to the motor. It outputs to the operation amount calculating part 48F.

  The motor operation amount calculation unit 48F calculates an operation amount for operating the motor 40 at a target current or a target rotation speed based on a signal output from the current feedback control unit 48E or the rotation feedback control unit 48H, and a drive circuit The motor 40 is controlled via 52. As shown in detail in FIG. 3, the motor operation amount calculation unit 48 </ b> F has a value obtained by multiplying the signal according to the current deviation and the control variable (α), a signal according to the rotation deviation described later, and the control variable (1− A motor operation amount obtained by adding the value obtained by multiplying α) is calculated. Here, the control variable α is “1” when current feedback control is performed, and is “0” when rotation feedback control is performed.

The motor rotation speed calculation unit 48G calculates the actual rotation speed (actual rotation speed) of the motor 40 based on, for example, an output signal from a hall element provided in the motor 40.
The rotation feedback control unit 48H calculates a deviation (rotation deviation) between the target rotation number calculated by the target rotation number calculation unit 48C and the actual rotation number calculated by the motor rotation number calculation unit 48G, and according to the rotation deviation. The signal is output to the motor operation amount calculation unit 48F.

4 and 5 show the control content of the electric oil pump 36 that the oil pump control device 48 repeatedly executes at predetermined time intervals Δt.
In step 1 (abbreviated as “S1” in the figure. The same applies hereinafter), it is determined whether or not a warm-up command is received from the warm-up command unit 44A of the transmission control device 44. If a warm-up command is accepted, the process proceeds to step 2 (Yes), while if a warm-up command is not accepted, the process proceeds to step 21 (No).

  In Step 2, it is determined whether or not the state where the warm-up command is not received is changed to the state where the warm-up command is accepted, that is, whether or not it is immediately after the warm-up command is received. If it is determined that the warm-up command has been received, the process proceeds to step 3 (Yes), while if it is determined that the warm-up command has not been received, the process proceeds to step 4. Advance (No).

In step 3, the control variable α is set to 1 (current feedback control).
In step 4, it is determined whether or not the control variable α is 1, in other words, whether or not current feedback control is being performed. If it is determined that the control variable α is 1 (current feedback control is being performed), the process proceeds to step 5 (Yes), while if it is determined that the control variable α is 0 (rotational feedback control is being performed), the process is performed. Proceed to step 13 (No).

  In step 5, it is determined whether or not the control variable α has changed from 0 to 1, in short, whether or not current feedback control is to be started. If it is determined that the control variable α has changed from 0 to 1, the process proceeds to step 6 (Yes), while if it is determined that the control variable α does not change from 0 to 1, the process proceeds to step 7. Advance (No).

In step 6, an initial value in current feedback control, for example, an integral value for PID control is reset (initialized).
In step 7, the target current in the current feedback control is set.

  In step 8, it is determined whether or not the motor speed of the motor 40 has reached the control switching speed N1 (first target speed). Here, the control switching rotational speed N1 is a threshold value that defines the timing for switching from current feedback control to rotational feedback control. For example, the control switching rotational speed N1 is electrically driven with a target current at the lowest oil temperature at which the performance of the electric oil pump 36 can be guaranteed. This is the steady rotational speed when the oil pump 36 is driven. If it is determined that the motor speed has reached the control switching speed N1, the process proceeds to step 9 (Yes), while if it is determined that the motor speed has not reached the control switching speed N1, the process is performed. Proceed to step 12 (No).

  In step 9, the timer 1 is counted up. Here, since the flowcharts shown in FIGS. 4 and 5 are repeatedly executed every predetermined time Δt, the time can be measured by multiplying the count value of the timer 1 and the predetermined time Δt (hereinafter referred to as “time”). The same).

  In step 10, it is determined whether or not the timer 1 has elapsed a predetermined time t1. Here, the timer 1 is a timer for measuring the duration of the state in which the motor rotation speed has reached the control switching rotation speed N1 in the current feedback control, and includes, for example, a clocking mechanism built in the computer. The predetermined time t1 takes a value that can suppress erroneous determination due to noise superposition, for example. If the timer 1 determines that the predetermined time t1 has elapsed, the process proceeds to step 11 (Yes), while if the timer 1 determines that the predetermined time t1 has not elapsed, the process ends (No).

  In step 11, processing for switching from current feedback control to rotation feedback control is executed. Specifically, the control variable α is set to 0, the timer 1 and the timer 2 are cleared, the timer 2 is counted up, the target rotation speed (second target rotation speed) in the warm-up operation is set, and the rotation An initial value in feedback control (for example, an integral value in PID control) is reset, and a target current is set to zero.

In step 12 after it is determined in step 8 that the motor rotational speed has not reached the control switching rotational speed N1, the process is terminated after the timer 1 is cleared.
In step 13 after it is determined in step 4 that the control variable α is 0, it is determined whether or not the timer 2 is within the predetermined time t2. Here, the timer 2 is a timer for measuring the duration of the rotation feedback control, and includes, for example, a timing mechanism built in the computer. In addition, the predetermined time t2 takes, for example, a value that is considered that the motor rotation speed will normally reach the warm-up completion rotation speed N1. If it is determined that the timer 2 is within the predetermined time t2, the process proceeds to step 14 (Yes), while if it is determined that the timer 2 exceeds the predetermined time t2, the process proceeds to step 19 (No). ).

  In step 14, it is determined whether or not the motor rotation speed of the motor 40 has reached the warm-up completion rotation speed N2. Here, the warm-up completion rotation speed N2 is a threshold value for determining whether or not the warm-up operation is completed. For example, at the lowest oil temperature at which the performance of the electric oil pump 36 can be guaranteed, the oil supply target Is the rotational speed satisfying the required flow rate of the speed change mechanism 28. If it is determined that the motor rotation speed has reached the warm-up completion rotation speed N2, the process proceeds to step 15 (Yes), while if it is determined that the motor rotation speed has not reached the warm-up completion rotation speed N2. The process proceeds to step 18 (No).

In step 15, the timer 3 is counted up.
In step 16, it is determined whether or not the timer 3 has passed a predetermined time t3. Here, the timer 3 is a timer for measuring the duration of the state in which the motor rotation speed has reached the warm-up completion rotation speed N2 in the rotation feedback control, and includes, for example, a clocking mechanism built in the computer. . Further, the predetermined time t3 takes an appropriate value for trial operation of the electric oil pump 36, for example. If the timer 3 determines that the predetermined time t3 has elapsed, the process proceeds to step 17 (Yes), while if the timer 3 determines that the predetermined time t3 has not elapsed, the process ends (No).

  In step 17, a process for completing the warm-up operation is executed. Specifically, the warm-up operation completion flag is set, and timer 2 and timer 3 are cleared. Here, by setting the warm-up operation completion flag, the activation of the electric oil pump 36 and the operation of the idle stop function are permitted.

In step 18, the timer 3 is cleared.
In step 19 after it is determined in step 13 that the timer 2 has exceeded the predetermined time t2, the control variable α is set to 1 (current feedback control) in order to restart the warm-up operation from the beginning.

In step 20, timers 1 to 3 are cleared.
In step 21 after it is determined in step 1 that the warm-up command has not been received, the control variable α is set to 0 (rotation feedback control) so as to perform a normal operation that is not a warm-up operation.

  In step 22, rotation feedback control is performed based on the target operation amount transmitted from the target operation amount calculation unit 44C of the transmission control device 44 so that the motor rotation speed of the motor 40 approaches the target rotation speed. Then, the process proceeds to step 20.

  According to the oil pump control device 48, when a warm-up command is received from the transmission control device 44, current feedback control of the motor 40 is started based on the target current as shown in FIG. Here, by performing current feedback control on the motor 40, even if the viscosity of the oil is large, an excessive current does not flow through the motor 40, and the thermal influence can be suppressed. Then, when the oil replacement of the electric oil pump 36 proceeds by current feedback control of the motor 40, the viscosity of the oil decreases and the motor rotation speed gradually increases. When the state where the motor rotational speed exceeds the control switching rotational speed N1 continues for a predetermined time t1, it is determined that the oil replacement has been completed, and the current feedback control is shifted to the rotational feedback control.

  In the rotation feedback control, the power supply current of the motor 40 is controlled to increase or decrease so that the motor rotation speed of the motor 40 approaches the target rotation speed. Then, when the state where the motor rotation speed of the motor 40 exceeds the warm-up completion rotation speed N2 continues for a predetermined time t3, it is determined that the electric oil pump 36 can be started without any trouble, and the warm-up operation of the electric oil pump 36 is finished. Let

  Accordingly, the completion timing of the warm-up operation is determined according to the actual motor speed, not the time, so that the activation of the electric oil pump 36 is permitted while the warm-up operation is insufficient, It is possible to suppress power consumption due to warm-up operation over a wide range. For this reason, optimization of warm-up operation can be achieved.

  In addition, after the transition from the current feedback control to the rotation feedback control, if the motor rotation speed of the motor 40 does not reach the warm-up completion rotation speed N2 even after the predetermined time t2, a problem may have occurred. The warm-up operation of the electric oil pump 36 is restarted from the beginning. In this case, the number of redoes may be counted, and when the count value reaches a predetermined value, it may be determined that a failure has occurred in the electric oil pump 36, the motor 40, its circuit, and the like.

  On the other hand, at the time of normal control when the warm-up operation of the electric oil pump 36 is completed, the motor 40 is subjected to rotational feedback control based on the target rotational speed corresponding to the operating state of the transmission mechanism 28 that is an oil supply target. For this reason, the oil according to the driving | running state of the transmission mechanism 28 is supplied, and the transmission mechanism 28 can be operated without trouble. In normal control, when priority is given to oil supply to the forward / reverse switching mechanism 16 and the continuously variable transmission 18 which are hydraulic systems, “current feedback control” for performing torque control on the load, cooling / lubricating system When priority is given to the oil supply to 32, "rotational feedback control" for performing flow rate control may be performed. When applied to a hydraulic system, “rotational feedback control” may be performed in a system including a relief valve that reduces the hydraulic pressure when the hydraulic pressure of the pump discharge section becomes equal to or higher than a set value.

  Whether or not the electric oil pump 36 should be warmed up is determined by the warm-up control unit 48A of the oil pump control device 48 based on, for example, the oil temperature detected by the oil temperature sensor 46. Good. In this case, the transmission control device 44 does not need to include the warm-up command unit 44A.

  When switching from current feedback control to rotation feedback control, the ratio between current feedback control and rotation feedback control may be changed by a control variable α that functions as a gain. In this case, the control variable α can be determined, for example, with reference to a table (map) in which a control value (a real value between 0 and 1) according to the oil temperature or the motor speed is set. Further, at the switching point from the current feedback control to the rotation feedback control, it is preferable to smoothly change the operation amount of the motor 40 so that the operation amount does not change greatly.

  Then, the target current in the current feedback control is set to the target current = 0 when the switching to the rotation feedback control is completed, that is, when the control variable α becomes zero. Further, immediately after switching to the rotation feedback control, for example, the initial value of the integral value for PID control may be obtained from the current motor rotation speed.

Here, “warm-up operation” and “normal operation” are defined.
When the viscosity of the oil as the working oil becomes excessive due to extremely low temperature and the motor load increases, there is a possibility that the performance-guaranteed flow rate cannot be discharged from the electric oil pump 36. For this reason, when oil is supplied when there is such a possibility, the “warm-up operation” in this case is to check whether or not the performance-guaranteed flow rate can be discharged.

  Basically, after the ignition switch is turned on, the higher level is output according to the output signals from the various sensors of the vehicle (vehicle speed, brake operation, accelerator opening, shift position, oil temperature, engine speed, battery voltage, etc.) When the warm-up operation command is transmitted from the control device and the oil pump control device 48 receives the warm-up operation command, the warm-up operation is performed. After the warm-up operation is performed, when the warm-up operation ends normally, the fact is transmitted to the host control device, and when the host control device recognizes the normal end of the warm-up operation, a normal operation command is output. On the other hand, the “normal operation” is an operation state in which a performance-guaranteed flow rate can be discharged from the electric oil pump 36, and rotation feedback control or current feedback that results in rotation or current according to a command from a higher-level control device. This is an operating state in which control can be performed.

  The trigger for transmitting the warm-up operation command from the host control device is not limited to the above conditions. For example, when the oil temperature becomes a predetermined value or less according to output signals from various sensors of the vehicle, For example, a case where the temperature is equal to or lower than a predetermined value that is a fixed value may be applied.

  Here, in the case of extremely low temperatures where there is little chance of transition to normal operation even after warm-up operation, or when the change in oil temperature is small and the effect of warm-up operation is small, The warm-up operation may not be performed while the engine that is the heat source is stopped.

  However, since the oil supply flow rate from the electric oil pump 36 is limited during the warm-up operation, for example, when the electric oil pump 36 is driven at maximum performance due to a failure (failure) of the cooling system, for example, The warm-up operation may be terminated and a transition to normal operation may be made.

  Further, if the initial oil temperature is not extremely low when the ignition switch is turned on, the motor load is not large, and the performance-guaranteed flow rate can be discharged. In this case, normal operation may be performed without performing warm-up operation.

  Furthermore, after the end of the warm-up operation, when there is a portion where the oil temperature locally decreases due to the influence of traveling wind or the like and the load becomes larger than the performance of the motor 40, the normal operation is stopped and the warm-up is stopped. The operation may be performed again.

The control device for the electric oil pump according to the present invention is not limited to the speed change mechanism 28 described above, but can be applied to various hydraulic devices that use oil as hydraulic oil and various hydraulic devices that use oil for cooling and lubrication. Needless to say.
Here, technical ideas other than the claims that can be grasped from the embodiment will be described together with effects.

(A) when the warm-up operation of the electric oil pump is completed, the control shifts to normal control for operating the electric oil pump according to the state of the oil supply target. The control apparatus of the electric oil pump as described in any one.
In this way, it is possible to shift to normal control of the electric oil pump when the warm-up operation of the electric oil pump is completed.

(B) When the warm-up operation of the electric oil pump is completed, the electric oil pump is allowed to start. Control device for electric oil pump.
In this way, when the warm-up operation of the electric oil pump is completed, for example, during the temporary stop of the engine by the idle stop function, the electric oil pump is started in response to an external start instruction. Can do.

(C) It further comprises estimation means for estimating the warm-up state of the electric oil pump, and the warm-up command for the electric oil pump is issued when it is estimated by the estimation means that the warm-up state is not established. The control device for an electric oil pump according to any one of claims 1 to 3, (A) and (B).
In this way, when the electric oil pump is no longer in the warm-up state, the warm-up operation can be started.

(D) The target current in the current feedback control and the target rotational speed in the rotation feedback control are set based on at least one of the characteristics of the electric oil pump, the power supply, and the drive circuit. The control device for an electric oil pump according to any one of claims 1 to 3, (a), (b), and (c).
In this way, since the target current and the target rotational speed that match the actual characteristics of the electric oil pump are set, the accuracy of the warm-up operation of the electric oil pump can be improved.

DESCRIPTION OF SYMBOLS 10 Engine 34 Mechanical oil pump 36 Electric oil pump 40 Motor 44 Transmission control apparatus 44A Warm-up command part 44B Operation command part 44C Target operation amount calculation part 48 Oil pump control apparatus 48A Warm-up control part 48B Target current calculation part 48C Target Rotation speed calculation section 48D Power supply current calculation section 48E Current feedback control section 48F Motor operation amount calculation section 48G Motor rotation speed calculation section 48H Rotation feedback control section

Claims (3)

A control device for an electric oil pump arranged in parallel to a mechanical oil pump driven by an engine,
In response to a warm-up command for the electric oil pump, a warm-up operation for operating the electric oil pump according to a rotational load is started, and the rotational speed of the electric oil pump reaches a first target rotational speed. And a control device for the electric oil pump, wherein the warm-up operation is terminated.   After the rotational speed of the electric oil pump reaches the first target rotational speed, the electric oil pump is further controlled so that the rotational speed of the electric oil pump becomes the second target rotational speed, and this control state is continued for a predetermined time. In such a case, the warm-up operation is terminated, and the electric oil pump control device according to claim 1.   3. The electric oil pump control device according to claim 1, wherein in the warm-up operation in which the electric oil pump is operated according to a rotational load, the electric oil pump is operated at a predetermined target current. 4. .

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