JP2012255353A - Control device of oil pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device of an oil pump which can avoid an unnecessary increase of a battery capacity by controlling a current value at a low temperature.SOLUTION: The current value supplied to a motor 2 is calculated by a current value calculation means 1061 (S6), and it is determined whether or not the calculated current value is larger than a current limit value (S7). When the calculated current value is larger than the current limit value, current limit processing is performed (S8), and on the other hand, when the calculated current value is not larger than the current limit value, rotation-number control processing is performed (S9). In the current limit processing, a difference between the calculated current value and the current limit value is operated (SB1), a DUTY value of a DUTY drive signal to the motor 2 is lowered by current-value PID control on the basis of the difference, constant current control is performed so that the calculated current value may not exceed the current limit value (SB2), and a process is returned to the step S6.

Description

  The present invention relates to a control device for an electric oil pump that controls the flow of oil.

  Conventionally, a brushless DC motor is used as a drive source to control the rotational speed of a gear pump (trochoid type) (see, for example, Patent Document 1).

  In such a gear pump, since the change in the viscous resistance due to the change in the temperature of the working fluid affects the rotational speed control, when the viscous resistance is large, correction such as increasing the rotational speed is required.

  Therefore, the first rotor position detecting means for detecting the rotational position of the rotor based on the detection result by the speed electromotive force detecting means for detecting the speed electromotive force induced in the exciting coil, and the magnetic field from the magnet provided on the rotating shaft And a second rotor position detecting means for detecting the rotational position of the rotor based on the detection result by the magnetic field detecting section. The rotational speed detection of one rotor position detecting means is selected, and the rotational speed detection of the second rotor position detecting means is selected on the low temperature side, so that the accuracy of rotational control with respect to temperature change can be compensated.

JP 2008-086117 A

  However, in such a conventional case, when the oil temperature of the working fluid is low, the oil viscosity resistance applied to the rotor in the pump becomes large, and the motor current is increased to compensate for the decrease in the rotation speed. However, since the capacity of the battery is limited, an increase in power consumption is not allowed and there is a problem that it is desired to suppress it.

  The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide an oil pump control device capable of solving at least one of the above problems.

  In order to solve the above-described problem, the oil pump control device according to claim 1 of the present invention is an oil pump control device that controls a flow rate by rotation of a rotating shaft that is rotationally driven by a motor, the oil pump control device. Temperature detecting means for detecting the oil temperature of the oil controlled by the pump, rotational speed calculating means for calculating the rotational speed of the oil pump, and speed control of the rotating shaft based on the oil temperature detected by the temperature detecting means A rotation speed correction unit that corrects the value, and further includes a current value limiting unit that gives an upper limit to the current value supplied to the motor calculated by the current value calculation unit.

  In other words, in normal pump control, a flow compensation characteristic that does not depend on manufacturing variations of the oil pump can be ensured by a leakage compensation function due to oil viscosity.

  At this time, when the current value supplied to the motor calculated by the current value calculation means is large, the current value can be limited by giving an upper limit value. Thereby, the power consumption of a battery is suppressed.

  Further, in the oil pump control device according to claim 2, the current value limiting means lowers the output DUTY of the DUTY signal output to the motor when the actual current value exceeds the current limit value at a low oil temperature, Constant current control is performed so as not to exceed the current limit value.

  That is, when the actual current value to the motor exceeds the current limit value, the constant current control can be performed so as not to exceed the current limit value by decreasing the output DUTY to the motor.

  For this reason, in the vehicle equipped with the oil pump, the battery consumption of the vehicle at a low temperature can be stabilized, so that an unnecessary increase in the battery capacity becomes unnecessary.

  Further, in a region that does not require a flow rate, such as at low temperatures, the flow of oil can be secured flexibly within the range allowed by the battery capacity.

  The oil pump control device according to claim 3 is a control device for an oil pump that controls a flow rate by rotation of a rotary shaft that is rotationally driven by a motor, and the oil temperature of the oil that is controlled by the oil pump. A temperature detection means for detecting the rotation speed, a rotation speed calculation means for calculating the rotation speed of the oil pump, and a rotation speed correction for correcting the speed control value of the rotary shaft based on the oil temperature detected by the temperature detection means. And a restart control means for restarting when the oil pump does not operate.

  That is, when the oil pump fails, the power consumption is suppressed by restarting at intervals.

  Further, in the oil pump control device according to claim 4, the restart control means repeatedly performs an operation of starting again after a predetermined time when the motor does not start at an extremely low temperature, and performs this repeated operation for a predetermined time. However, if it cannot be started, it is diagnosed as a failure and a start failure is determined.

  That is, when starting at an extremely low temperature, when the oil temperature of the oil rises after a predetermined time and the motor can be started, the start using the restart control is possible.

  In addition, since the system can be configured without unnecessarily increasing the motor output, the motor can be reduced in size and cost can be reduced.

  Further, in the control apparatus for an oil pump according to claim 5, the time for determining the start-up failure is within a range that does not damage a vehicle on which the oil pump is mounted, for example, within a time that can withstand traveling in a non-lubricated state. Set.

  As a result, the safety of the vehicle electrical system and related mechanisms can be improved.

  In addition, in the control apparatus for an oil pump according to a sixth aspect of the invention, the predetermined time is determined by an allowable temperature of operation of a circuit element of a motor controller that controls the motor.

  Thereby, the excessive temperature rise of the circuit element of a motor controller, especially heat generating elements like FET is suppressed, and the reliability of a motor controller is improved.

  As described above, in the oil pump control device according to claim 1 of the present invention, when the current value supplied to the motor calculated by the current value calculation means is large, the current value is limited by giving an upper limit value. can do.

  Thereby, since the power consumption of the battery can be suppressed, an unnecessary increase in the battery capacity can be avoided, and the battery can be prevented from rising at a low temperature.

  Further, in the control device for the oil pump according to the second aspect, since the battery consumption of the vehicle at the low temperature can be stabilized, it is possible to avoid unnecessarily increasing the capacity of the battery.

  Further, in a region where a flow rate is not required, such as at low temperatures, the flow rate can be flexibly flowed as much as the battery capacity permits.

  And in the control apparatus of the oil pump of Claim 3, the increase in power consumption can be suppressed by setting an interval for restart at the time of the failure in which a pump does not start.

  Moreover, since it restarts after an interval, the start at extremely low temperature can be performed as much as possible.

  Further, in the control apparatus for the oil pump according to claim 4, when starting at an extremely low temperature, the restart control is used when the oil temperature rises due to the heat generated by the vehicle traveling after a predetermined time and the motor can be started. Therefore, it is possible to prevent a trouble that makes it impossible to run.

  In addition, since the system can be configured without unnecessarily increasing the motor output, the motor can be reduced in size and cost can be reduced.

  Furthermore, in the control apparatus for the oil pump according to the fifth aspect, the safety of the electric system of the vehicle, the related mechanism, and the like can be improved.

  In addition, in the oil pump control device according to the sixth aspect of the present invention, it is possible to suppress the excessive temperature rise of the circuit elements of the motor controller, particularly the heating elements such as FETs, and to improve the reliability of the motor controller. .

It is sectional drawing which shows one embodiment of this invention. It is a disassembled perspective view which shows the embodiment. It is a block diagram for demonstrating the embodiment. (A) It is a figure which shows the required flow volume with respect to oil temperature, (b) It is a figure which shows the command rotational speed with respect to oil temperature. (A) It is a figure which shows the command rotational speed with respect to oil temperature, (b) It is a figure which shows the target rotational speed control with respect to a command, and a control system. It is a flowchart which shows the operation | movement which concerns on the current control at the time of the low temperature in the embodiment. It is a timing chart which shows restart control at the time of cryogenic temperature. It is a flowchart which shows the operation | movement which concerns on restart control at the time of cryogenic temperature in the embodiment. It is a figure which shows the rotation speed and electric current value with respect to a torque.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing an electric gear pump 1 controlled by an oil pump control device according to the present embodiment. The electric gear pump 1 includes a motor 2 and oil driven by the motor 2. A pump 3 is provided. As a result, oil for cooling the motor is supplied, or the oil pressure that is attached to the automatic transmission 4 such as the AT or CVT of the automobile and decreases during idle stop is maintained at a predetermined pressure.

  That is, a hydraulic circuit is formed in the automatic transmission 4, and a hydraulic path 12 for forming the hydraulic circuit is formed in the casing 11 of the automatic transmission 4. A mounting hole 14 for mounting the electric gear pump 1 is opened on the outer surface 13 of the casing 11 so that the front end portion of the electric gear pump 1 is inserted into the mounting hole 14. It is configured.

  Oil 21 used for control of the automatic transmission 4 circulates in the hydraulic path 12, and a back surface 22 of the mounting hole 14 has a communication path 23 communicating with an oil storage portion (not shown) and an additional pressure. An output path 24 for outputting the pressurized oil 21 is opened.

  FIG. 2 is an exploded perspective view showing the electric gear pump 1. The electric gear pump 1 includes a pump component 31 constituting the trochoid oil pump and a motor for driving the pump component 31. A configuration unit 32 and a motor drive control unit 33 for controlling the motor configuration unit 32 are provided. The pump component 31, the motor component 32, and the motor drive controller 33 are arranged in the extending direction of the rotating shaft 34 that constitutes the motor component 32, and extend from the motor component 32. As shown in FIG. 1, the rotating shaft 34 is configured to be connected to the pump component 31 in the assembled state.

  The electric gear pump 1 includes a cylindrical case 41 constituting an outer peripheral portion, and the pump component 31 and the motor component 32 are fitted inside the case 41. In this internal fitting state, the outer peripheral surface of the pump component 31 and the outer peripheral surface of the motor component 32 are configured to contact the inner surface 42 of the case 41, and in this surface contact state, the pump The component 31 and the motor component 32 are configured to be positioned.

  A case flange portion 51 that extends outward is integrally formed at the base end of the case 41, and the electric gear pump 1 includes the case flange portion 51 as shown in FIGS. 1 and 2. The distal end side constitutes an insertion region to be inserted into the mounting hole 14 provided in the casing 11, and the proximal end side from the case flange portion 51 is configured to form a protruding region protruding from the casing 11. Yes.

  In a state where the electric gear pump 1 is mounted in the mounting hole 14, the case flange portion 51 is configured to contact the outer surface 13 of the casing 11, and the case flange portion 51 causes the electric motor pump 1 to be in contact with the outer surface 13. The gear pump 1 is configured to be fixed to the casing 11.

  The pump component 31 and the motor component 32 are arranged on the distal end side of the case 41 with respect to the case flange portion 51 constituting the insertion region, and the mounting state shown in FIG. , The front end surface of the pump component 31 protruding from the case 41 is configured to face the back surface 22 of the mounting hole 14.

  As shown in FIGS. 1 and 2, the pump component 31 includes a pump base 71 that forms a distal end side, and a pump housing 72 that is disposed on the proximal end side of the pump base 71, An O-ring 73 is disposed between the pump housing 72 and the pump base 71. As shown in FIG. 1, a circular projecting portion 74 that is inserted into the circular hole 62 of the case 41 and projects to the outside is integrally formed on the front end surface of the pump base 71. In the state where the outer peripheral portion of the protruding portion 74 is supported by the bent portion 61 at the tip of the case 41, the protrusion 74 is prevented from coming off to the tip side.

  One end portion of a pin 91 is inserted into the base end surface of the pump base 71, and the other end portion of the pin 91 is placed on the front end surface of the pump housing 72 arranged to face the pump base 71. Has been inserted. Accordingly, the pump housing 72 is positioned with respect to the pump base 71. In this state, the pump housing 72 is press-fitted and fixed to the case 41, and the outer peripheral surface of the pump base 71 is The case 41 is fixed in close contact with the inner surface 42.

  As shown in FIG. 1, the central portion of the pump housing 72 is immersed, and a rotor accommodating portion 101 is formed between the pump housing 72 and the pump base 71. A pump rotor outer 102 is rotatably accommodated in the rotor accommodating portion 101, and a pump rotor inner 103 is rotatably accommodated in the pump rotor outer 102.

  A suction port 111 and a discharge port 112 provided in the pump base 71 communicate with the rotor accommodating portion 101, and both ports 111, 112 are opened at the end surface of the projecting portion 74 of the pump base 71. Is configured to do.

  The suction port 111 is configured to be connected to the communication path 23 provided in the inner surface 22 of the mounting hole 14 in a state where the electric gear pump 1 is mounted in the mounting hole 14. The discharge port 112 is configured to be connected to the output path 24 through an O-ring 121.

  As a result, the pump rotor outer 102 rotates as the pump rotor inner 103 rotates, so that the oil sucked from the communication passage 23 through the suction port 111 is pressurized, and the discharge port 112 A trochoid pump that outputs to the output path 24 is formed.

  On the base end side of the trochoid pump, as shown in FIG. 1, a direct current motor constituted by the motor constituting portion 32 is disposed. The motor includes a motor case 201 that forms an outer peripheral portion, and the outer peripheral surface of the motor case 201 is fixed in a state of being in close contact with the inner side surface 42 of the case 41.

  A coil 212 around which a motor winding 211 is wound is fitted inside the motor case 201, and a stator 213 excited by the coil is held in the coil 212. A motor rotor core 214 is rotatably accommodated inside the stator 213, and a magnet 215 is provided on the outer peripheral surface of the motor rotor core 214. The rotation shaft 34 is inserted into the motor rotor core 214, and the rotation shaft 34 is fixed in a state of penetrating the motor rotor core 214.

  The other end portion of the rotating shaft 34 extends toward the front end side, and the rotating shaft 34 is inserted through the center hole 222 of the pump housing 72 through the oil seal 221 to be inside the rotor accommodating portion 101. It is comprised so that it may protrude. A flat surface 223 is formed on the peripheral surface of the rotating shaft 34 protruding from the rotor accommodating portion 101, and a rotor connecting portion 224 having a D-shaped cross section is formed. This rotor connecting portion 224 is inserted into the D-shaped hole 225 of the pump rotor inner 103 accommodated in the rotor accommodating portion 101, and then freely rotatable into the counterbore hole 227 of the pump base 71 via the tip side bearing. Supported in a contained state.

  The motor drive control unit 33 is disposed on the base end side of the motor configured by the motor configuration unit 32, and the motor drive control unit 33 is connected to the base end portion of the motor configuration unit 32. Insulator 301 is provided (see FIG. 2).

  The insulator 301 is made of synthetic resin, and is integrally formed with a motor connecting portion 311 that is inserted into the base end portion of the motor case 201 of the motor constituting portion 32 and connected in an internally fitted state. One end portion of the rotating shaft 34 is rotatably supported by the motor connecting portion 311 via a base end side bearing 314.

  Bus bars 321,... For relaying energization to the motor winding 211 are insert-molded in the motor connection portion 311, and the bus bars 321,. The motor winding 211 is electrically connected.

  In addition, a connector portion 322 that protrudes upward and has a harness connection hole 324 opened to the side is integrally formed on the side edge portion of the motor connection portion 311, and is formed on the back surface of the connector portion 322. The connection terminals 323 and 323 that are electrically connected to the harness are insert-molded.

  A plurality of support columns 333,... Are erected on the end surface of the motor connection unit 311, and a control board 334 is supported by the support columns 333,. An electronic circuit is formed on the control board 334, and the bus bar 321 is based on a signal input from the connector unit 322 in a state where the harness extended from an external device is connected to the connector unit 322. ,... Is configured to control the motor drive by controlling the output signal to.

  The motor drive control unit 33 includes a container-like controller cover 331 attached to the base end portion of the case 41, and the control board 334 supported by the motor connection unit 311 is configured by the controller cover 331. It is comprised so that it may be covered with.

  The controller cover 331 is made of aluminum, and a plurality of cooling fins 341,... For releasing heat generated inside to the outside are provided on the outer surface of the controller cover 331.

  An engagement recess 351 is formed in the base end portion of the connector portion 322 of the insulator 301, and the end portion side of the engagement recess 351 is slightly lower than the general portion of the connector portion 322 base end. A step portion 352 is formed. An extension piece 353 on one end side of the controller cover 331 that overlaps with the base end portion of the connector portion 322 is configured to extend on the stepped portion 352, and at the tip of the extension piece 353. The engaging convex portion 354 that engages with the engaging concave portion 351 is bent.

  As a result, the meshing structure in which the engagement convex portion 354 of the controller cover 331 is engaged with the engagement concave portion 351 of the connector portion 322 is engaged with the engagement convex portion 354 and the engagement concave portion. 351, a sealant is applied to a joint portion between the engagement recess 351 and the engagement projection 354 so that the engagement projection 354 and the engagement recess 351 are engaged with each other at the time of assembly. It is configured.

  Further, on the other end side of the controller cover 331, a cover flange portion 371 extending in a lateral direction from a portion externally fitted to the motor case 201 in a mounted state corresponds to the case flange portion 51. The cover flange portion 371 and the case flange portion 51 are in contact with each other and the outer fitting portion that is externally fitted to the motor case 201 is applied with a sealant during assembly. ing.

  A bolt insertion hole 381 is formed in the cover flange portion 371 and the case flange portion 51 that is in contact with the cover flange portion 371, and a collar 382 is fitted in the bolt insertion hole 381.

  As a result, as shown in FIG. 1, the bolt 391 inserted through the collar 382 in the bolt insertion hole 381 in a state where the case flange portion 51 is in contact with the outer surface 13 of the casing 11 at the time of mounting. The electric gear pump 1 can be fixed to the casing 11 by being screwed into a screw hole 392 formed in the casing 11.

  FIG. 3 is a block diagram showing an oil pump control device 1001 for controlling the electric gear pump 1.

  The oil pump control device 1001 includes a controller 1011 constituting the motor 2 side and a host controller 1012 connected to the controller 1011.

  The host controller 1012 is provided with a flow rate characteristic changing unit 1021, and the flow rate characteristic control unit 1021 is connected to an oil temperature sensor 1022 that detects the oil temperature of the oil 21 controlled by the oil pump 3. . Accordingly, the flow rate characteristic changing unit 1021 is configured to be able to calculate the oil temperature based on a signal from the oil temperature sensor 1022.

  The flow rate characteristic changing means 1021 is connected to a current control command block 1031 that operates at a low temperature and a rotation speed command block 1032 that operates at a high temperature, and a command command from the current control command block 1031 is based on the oil temperature. Or a command command from the rotation speed command block 1032 can be selected.

  The rotation speed command block 1032 is configured to output a rotation speed command for rotating the motor 2 at a rotation speed corresponding to the oil temperature.

  That is, it is desirable that the flow rate from the oil pump 3 is constant even when the oil temperature changes between θ1 and θ2 as shown in FIG. However, when the oil temperature rises, the viscosity of the oil 21 decreases, and the leakage flow rate at the oil pump 3 increases. Therefore, in order to keep the flow rate with respect to the oil temperature constant, it is necessary to increase the command rotational speed as the oil temperature changes from θ1 to θ2, as shown in FIG. Block 1032 is configured to output an appropriate command rotational speed based on the oil temperature in order to keep the flow rate constant.

  (A) of FIG. 5 is a figure which shows the command content with respect to the said oil temperature, and the said flow characteristic changing means 1021 starts control by the said rotation speed command block 1032 when oil temperature is more than (theta) 1, and oil temperature The state in which the commanded rotational speed increases as the speed increases is shown. FIG. 5B shows a command area by the current control command block 1031 and a command area by the rotation speed command block 1032, and the rotation speed command block 1032 outputs a DUTY drive signal to be output. It is shown that the rotational speed increases from N3 to N2 as the DUTY ratio increases from D2 to D3.

  As shown in FIG. 3, the controller 1011 is provided with a rotation speed calculation means 1041. The rotation speed calculation means 1041 changes the rotation speed of the rotating shaft 34 of the motor 2, for example, a change in motor current. And is calculated based on a signal from the sensor. The rotation speed calculated by the rotation speed calculation means 1041 is output to the rotation speed control amount restriction means 1042, and the rotation speed control amount restriction means 1042 receives the rotation speed by the host controller 1012. When the command block 1032 is selected, the rotational speed command is input from the rotational speed command block 1032.

  As a result, the rotational speed control amount limiting means 1042 compares the rotational speed of the motor 2 with the rotational speed command from the rotational speed command block 1032 to limit the rotational speed control amount and rotate it. The rotational speed correction means 1051 is configured to output to the speed correction means 1051, and the rotational speed correction means 1051 is a DUTY drive for bringing the rotational speed of the motor 2 close to a command value based on a signal from the rotational speed control amount restriction means 1042. A signal is output to the motor 2.

  Further, the controller 1011 is provided with a current value calculating means 1061, which calculates a current value supplied to the motor 2 and outputs it to the current value limiting means 1062. It is configured. The current value limiting means 1062 is configured to receive a current control command from the current control command block 1031 when the current control command block 1031 is selected by the host controller 1012.

  Thus, the current value limiting means 1062 outputs a signal that makes the current value constant when the actual current value supplied to the motor 2 exceeds a predetermined current limit value. It is configured to output to.

  The current value correcting unit 1063 is configured to control the DUTY value of the DUTY drive signal based on the signal from the current value limiting unit 1062 so that the current value of the motor 2 becomes constant and output the DUTY value to the motor 2. Has been.

  FIG. 6 is a flowchart showing the operation of the control apparatus 1001 for the oil pump, showing the operation when the oil temperature is low.

  That is, when operating the electric gear pump 1, the controller 1011 outputs a drive signal to the motor 2 to start the motor (S1), and the motor 2 is started from the rotation state of the motor 2. It is determined whether or not (S2).

  At this time, at a low temperature when the viscosity of the oil 21 is high, the motor 2 may not start, and in this case, restart control is started.

  In this restart control, it is determined whether or not a fail time t2 stored in advance in a memory or the like has elapsed since the start of the restart control (S3). In the initial stage, since the fail time t2 has not elapsed, the motor 2 is tried to start (S1) after returning to the step S1 after stopping for a predetermined time t1 (S4). At this time, if the motor 2 is not activated, the steps S1 to S4 are repeated.

  Here, the predetermined time t1 is determined by a circuit element of a motor controller driving circuit that drives the motor 2, specifically, an allowable operating temperature of the driving FET, and the normal operation of the driving FET is possible. The continuous energization time is set to 15 seconds, for example.

  Further, the fail time t2 is set to a time that does not damage the vehicle on which the oil pump 3 is mounted.

  For example, when the oil pump 3 is used in an automatic transmission 4 such as an AT or CVT of an automobile, the operation of the automatic transmission 4 is continued even when the supply of oil 21 by the oil pump 3 is stopped. The continuous operation time in which the automatic transmission 4 does not break down is set to, for example, 5 minutes. Further, when the oil pump 3 is used for supplying cooling oil, it is set to a continuous time that does not cause problems such as baking even if the continuous operation is continued.

  When the restart control is performed at the fail time t2 (S3), the start failure is recorded in the memory (S5), and the process is terminated.

  As a result, as shown in FIG. 7, the motor 2 is processed as a failed start failure when the start at every predetermined time t1 is attempted after the fail time t2 and cannot be started. For this reason, at the time of failure, failure determination can be reliably performed.

  On the other hand, as shown in FIG. 6, when the motor 2 is started (S2), current control is started.

  In this current control, as shown in FIG. 8, the current value calculation means 1061 calculates the actual current value supplied to the motor 2 (S6), and the calculated current value is set in the memory in advance. It is determined whether or not it is larger than the limit value (S7). At this time, when the calculated current value is larger than the current limit value, current limit processing is performed (S8), and when the calculated current value is equal to or less than the current limit value, rotation speed control processing is performed (S8). S9).

  Specifically, in the current control process S8, a difference between the calculated current value and the current limit value is calculated (SB1), and a DUTY drive signal to the motor 2 is controlled by current value PID control based on the difference. DUTY value is decreased, constant current control is performed within a range where the calculated current value exceeds the current limit value (SB2), and the process returns to step S6.

  FIG. 9 is a diagram showing the effect when the output DUTY is lowered, and shows how the current supplied to the motor 2 is lowered by lowering the output DUTY from Do2 to Do1. Therefore, by reducing the output DUTY in accordance with the current value PID control described above, the actual current value is maintained to be less than the current limit value, and the actual current value supplied to the motor 2 is constant. Can be controlled.

  At this time, the rotation speed of the motor 2 can be automatically reduced to a rotation speed determined by the NT characteristic of the motor 2 corresponding to the current value.

  Further, as shown in FIG. 8, in the rotational speed control process (S9), the difference between the current rotational speed of the current motor 2 and the target rotational speed is calculated (SB3), and the rotational speed PID is calculated based on this difference. Under control, the DUTY value of the DUTY drive signal to the motor 2 is increased or decreased (SB4), and the process returns to step S6.

  As a result, when the actual current value is equal to or less than the current limit value, the rotation speed of the motor 2 can be controlled to be the target rotation speed.

  In the present embodiment having the above configuration, in the normal pump control, it is possible to ensure the flow rate characteristic regardless of the manufacturing variation of the oil pump 3 by the leakage compensation function due to the viscosity of the oil 21.

  At this time, when the current value supplied to the motor 2 calculated by the current value calculation means 1062 is large, the current value can be limited by giving an upper limit value by the current limit value.

  Thereby, since the power consumption of the battery that supplies power to the motor 2 can be suppressed, an unnecessary increase in the battery capacity can be avoided, and the battery can be prevented from rising at a low temperature.

  Further, when the actual current value to the motor 2 exceeds the current limit value, the constant current control is performed so as not to exceed the current limit value by lowering the output DUTY to the motor 2. it can.

  For this reason, in the vehicle in which the oil pump 3 is mounted, the battery consumption of the vehicle at a low temperature can be stabilized, so that an unnecessary increase in the battery capacity becomes unnecessary.

  Further, in a region that does not require a flow rate such as at low temperatures, the flow of the oil 21 can be secured flexibly within a range that the battery capacity allows.

  When the oil pump 3 fails, the increase in power consumption can be suppressed by setting an interval of a predetermined time t1 for restarting the oil pump 3.

  Furthermore, since it restarts at intervals, it can be started as much as possible at extremely low temperatures.

  In addition, when the motor 2 is started at an extremely low temperature, the oil temperature rises with a lapse of a predetermined time, and when the motor can be started, it can be started using the restart control.

  In addition, since the system can be configured without unnecessarily increasing the motor output, the motor 2 can be reduced in size and cost.

  Further, the fail time t2 for determining a failure in starting failure is set to a time in a range that does not damage the vehicle on which the oil pump 3 is mounted.

  Thereby, safety | security of the electrical system of a vehicle, a related mechanism, etc. can be improved.

  In addition, the predetermined time t1 is determined by a circuit element of a motor controller driving circuit that drives the motor 2, specifically, an allowable operating temperature of the driving FET, thereby enabling normal operation of the driving FET. The continuous energization time is set.

  For this reason, the excessive temperature rise of the circuit element of the controller 1011 of the motor 2, particularly the heating element such as FET, can be suppressed, and the reliability of the controller 1011 can be improved.

DESCRIPTION OF SYMBOLS 1 Electric gear pump 2 Motor 3 Oil pump 31 Pump component 32 Motor component 34 Rotating shaft 1011 Controller 1022 Oil temperature sensor 1041 Rotation speed calculation means 1051 Rotation speed correction means 1061 Current value calculation means 1062 Current value restriction means

Claims (6)

An oil pump control device for controlling a flow rate by rotation of a rotating shaft driven to rotate by a motor,
Temperature detecting means for detecting the oil temperature of the oil controlled by the oil pump;
Rotation speed calculation means for calculating the rotation speed of the oil pump;
Rotation speed correction means for correcting the speed control value of the rotation shaft based on the oil temperature detected by the temperature detection means;
An oil pump control device, further comprising current value limiting means for giving an upper limit value to a current value supplied to the motor calculated by a current value calculating means.   The current value limiting means lowers the output DUTY of the DUTY signal output to the motor when the actual current value exceeds the current limit value at low oil temperature, and performs constant current control so as not to exceed the current limit value. The oil pump control device according to claim 1, wherein the control device is used. An oil pump control device for controlling a flow rate by rotation of a rotating shaft driven to rotate by a motor,
Temperature detecting means for detecting the oil temperature of the oil controlled by the oil pump;
Rotation speed calculation means for calculating the rotation speed of the oil pump;
Rotation speed correction means for correcting the speed control value of the rotation shaft based on the oil temperature detected by the temperature detection means;
An oil pump control apparatus, further comprising restart control means for restarting when the oil pump is not operated.   The restart control means repeats the operation of starting again after a predetermined time if the motor does not start at extremely low temperature, and if the restart cannot be started even after performing this repeated operation for a predetermined time, it diagnoses a failure and fails The oil pump control device according to claim 3, wherein:   5. The oil pump control device according to claim 4, wherein the time for determining the start-up failure is set to a time in a range in which the vehicle on which the oil pump is mounted is not damaged.   6. The oil pump control device according to claim 4, wherein the predetermined time is determined by an allowable temperature of operation of a circuit element of a motor controller that controls the motor.

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