JP2014077549A - Control device of electric oil pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the determination of an occurrence of idling even in an area where determination based on a load of an electric oil pump is difficult.SOLUTION: A target rotation speed tNset for determination higher than a requested rotation speed tNreq corresponding to an operation request of an electric oil pump is set, and control of an electric motor for making the rotation speed N of the electric oil pump into the set target rotation speed tNset for determination is executed. The actual rotation speed N of the electric oil pump is detected while executing the control of the electric motor, and an occurrence of idling in the electric oil pump is determined on the basis of the detected rotation speeds Nnrm, Nidl.

Description

  The present invention relates to a control device for an electric oil pump using an electric motor as a power source.

  As a method for determining the idling of the electric oil pump, there is a method that uses a motor current during operation of the pump. Specifically, a motor current (for example, its drive command value) is detected during pump operation, and when this is smaller than a predetermined value, occurrence of the idling is determined (Patent Document 1 below).

JP 2009-299665 A

  However, in a region where the oil temperature is extremely low, an increase in pump load is suppressed from the viewpoint of limiting the operation of the electric motor against a significant increase in oil viscosity. A significant difference is not formed in the determination, and determination based on the motor current becomes difficult.

  In view of the above-described problems, an object of the present invention is to make it possible to easily determine the occurrence of idling even in a region where determination based on the load of the electric oil pump is difficult.

  The present invention achieves the above object by increasing the target rotational speed of the electric oil pump when determining idling. A control device for an electric oil pump according to the present invention is a control device for an electric oil pump that supplies oil using an electric motor as a power source, and in one embodiment, a required rotational speed corresponding to an operation request of the electric oil pump. A determination time control means for executing control of the electric motor for setting a higher target rotation speed for determination and setting the rotation speed of the electric oil pump to the target rotation speed for determination, and control of the electric motor A rotational speed detecting means for detecting an actual rotational speed of the electric oil pump during the operation of the electric oil pump, and an idle speed for determining the occurrence of the idling in the electric oil pump based on the rotational speed detected by the rotational speed detecting means A determination unit; and a control signal output unit that outputs a control signal according to a determination result by the idling determination unit.

  According to the present invention, by introducing the target rotational speed for determination and increasing the target rotational speed of the electric oil pump at the time of idling determination, an increase in pump load is suppressed during normal operation, and the actual rotational speed becomes the target rotational speed. The target speed is not followed and the difference from the target speed is increased. On the other hand, when idling occurs, the actual speed can follow the target speed. Even in a region where determination based on the load on the pump is difficult, it is possible to easily determine the occurrence of idling based on the rotational speed.

The block diagram of the transmission system for vehicles provided with the control apparatus of the electric oil pump which concerns on one Embodiment of this invention. Flow chart of idling determination routine executed by the control device The flowchart which shows the flow of the target rotational speed calculation process in the idling determination routine same as the above. The flowchart which shows the flow of the diagnosis start determination process in the idling determination routine same as the above. Flow chart showing the flow of pump operation request detection processing Flow chart showing the flow of phase current decrease detection processing Flow chart showing the flow of hunting detection processing Flow chart showing the flow of phase current edge count processing Explanatory drawing which shows the outline of the change with respect to the oil temperature of target rotation speed Explanatory diagram showing an example of the actual rotation speed of the brushless motor and changes in the phase current during normal operation and idling The block diagram of the transmission system for vehicles provided with the control apparatus of the electric oil pump which concerns on other embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a configuration diagram of a vehicle transmission system including a control device 4 for an electric oil pump 7 according to an embodiment of the present invention.

  In the present embodiment, an internal combustion engine (hereinafter referred to as “engine”) 1 constitutes a drive source of a self-propelled vehicle, and a crankshaft moves forward and backward (not shown) for switching between a start clutch 2 and forward and reverse of the vehicle. It is connected to the continuously variable transmission 3 via a switching mechanism.

  The starting clutch 2 is a wet multi-plate clutch (FIG. 1 shows only a pair of clutch plates for convenience of explanation) in the present embodiment, and receives input of oil when starting the vehicle and receives input and output side clutches. The plates 2 a and 2 b are fastened to transmit the output torque of the engine 1 to the continuously variable transmission 3.

  The continuously variable transmission 3 includes a primary pulley 31 and a secondary pulley 32 and a belt 33 that is stretched between the pulleys 31 and 32. This is transmitted to the pulley 32 and the shaft member connected to the vehicle driving wheel is rotated. The gear ratio of the continuously variable transmission 3 can be changed by adjusting the oil supply pressure to the pulleys 31 and 32. Specifically, by moving the movable conical plate in the axial direction by supplying oil in each of the pulleys 31 and 32, the radius at the belt contact position in each of the pulleys 31 and 32 is adjusted, and the rotation of both the pulleys 31 and 32 is performed. Change the ratio.

  The control unit 4 constitutes an “electric oil pump control device” in this embodiment, and includes “determination time control means”, “rotational speed detection means”, “idle rotation determination means”, “control signal output means” and “oil The function as “temperature detecting means” is realized. The control unit 4 has a built-in microcomputer, inputs various sensor output signals indicating the driving state of the vehicle, calculates start and shift control signals based on these sensor output signals, and calculates control signals. Is output to the pressure regulator 5.

  The pressure adjusting device 5 receives a start and shift control signal, adjusts the discharge pressure of the oil pumps 6 and 7 to a target supply pressure to each part of the shift system based on this signal, and supplies the adjusted oil to the start clutch. 2 and continuously variable transmission 3.

  The oil pump system according to this embodiment is configured by combining a mechanically driven pump (mechanical oil pump) 6 that operates in response to the output torque of the engine 1 and an electrically driven pump (electric oil pump) 7 having a power source. Has been. The electric oil pump 7 is interposed in an oil passage that bypasses the mechanical oil pump 6, and uses an electric motor (in this embodiment, a brushless motor) 71 as a power source. The mechanical oil pump 6 and the electric oil pump 7 can be operated simultaneously or individually, pump oil from an oil pan 8 attached to a transmission housing (not shown), and supply it to the pressure regulator 5. In the present embodiment, a check valve 9 is installed in an oil passage in which the electric oil pump 7 is provided, and the high pressure oil pumped up by the mechanical oil pump 6 is transferred to the electric oil pump 7 side by the check valve 9. It is prevented from flowing into the passage.

  Here, in the present embodiment, idle stop / start control is executed for the engine 1 and oil is continuously supplied to the starting clutch 2 and the continuously variable transmission 3 by the electric oil pump 7 during the idle stop, so that after the idle stop. When the engine restarts, torque transmission to the drive wheels is smoothed, and the occurrence of torque shock due to insufficient discharge pressure of the mechanical oil pump 6 immediately after the restart of the engine 1 is suppressed.

  In this way, the control unit 4 mainly performs vehicle start and shift control, but in this embodiment, in addition to this, it is determined that the idling occurs during the operation of the electric oil pump 7, When the occurrence of idling is detected, a warning is displayed to the driver and execution of idle stop / start control is prohibited. The display device 21 receives a control signal from the control unit 4 and displays a warning indicating that the electric oil pump 7 is idle. Below, the control (idling determination routine) for determining idling of the electric oil pump 7 will be described. The idle rotation of the electric oil pump 7 occurs due to a decrease in the amount of oil in the oil pan 8, mixing of bubbles in the oil passage, oil leakage from a poorly connected hydraulic system piping, or the like. In the present embodiment, it is assumed that the idling due to at least these events is the idling to be determined.

  FIG. 2 is a flowchart of the idling determination routine according to the present embodiment. This routine is executed by the control unit 4 every predetermined time.

  In S101, it is determined whether or not there is a request for operating the electric oil pump 7. If there is a pump operation request, the process proceeds to S102, and otherwise, the process proceeds to S113.

  In S102, the oil temperature Toil is read. In the present embodiment, the oil temperature Toil is detected by a temperature sensor 11 provided in the oil pan 8. The processing in this step realizes the function as “oil temperature detecting means”.

  In S103, the target rotational speed tNset of the electric oil pump 7 is calculated, and the feedback control of the rotational speed is executed so that the actual rotational speed N of the electric oil pump 7 is the calculated target rotational speed tNset. The target rotational speed tNset is calculated by the target rotational speed calculation process shown in FIG.

  In S104, it is determined whether or not the idling determination start flag Fstr is set to 1. If it is set to 1, the process proceeds to S105, and otherwise, the process proceeds to S113. The idling determination start flag Fstr is set by the process (diagnosis start determination process) shown in FIGS.

  In S105, the actual rotational speed N of the electric oil pump 7 is detected. Whether the difference between the target rotational speed tNset and the detected rotational speed N is equal to or less than a predetermined value SLn1, and whether the oil temperature Toil is equal to or less than a predetermined value T1. Determine whether or not. If these conditions are satisfied, that is, if the rotational speed N of the electric oil pump 7 follows the target rotational speed tNset in an environment where the oil is in a low temperature state, the process proceeds to S106, and if not satisfied, the process proceeds to S108. move on. The processing in this step realizes functions as “rotational speed detection means” and “idle rotation determination means”.

  In S106, the first timer TIM1 is counted up (for example, TIM1 = TIM1 + 1).

  In S107, it is determined whether the timer TIM1 after the count has reached a predetermined value SLt1. If it has reached, the process proceeds to S111, and if not, this routine is returned.

  In S108, the phase current Ii of the brushless motor 71 that drives the electric oil pump 7 is detected, and it is determined whether or not the detected phase current (specifically, the phase current filter value) Ii is equal to or less than a predetermined value SLi1. . When the value is equal to or less than the predetermined value SLi1, that is, in an environment where the oil is at a temperature higher than the predetermined value T1, the load (pump load) of the electric oil pump 7 decreases beyond the range where the lower limit is determined by the predetermined value SLi1. If so, the process proceeds to S109. Otherwise, the process proceeds to S113. In the present embodiment, the phase current filter value Ii is a value obtained by subjecting the phase current of the brushless motor 71 measured by the current sensor to a process such as a primary filter. The phase current filter value Ii can be substituted with a drive command value (current command value) for the brushless motor 71.

  In S109, the second timer TIM2 is counted up (for example, TIM2 = TIM2 + 1).

  In S110, it is determined whether the timer TIM2 after counting up has reached a predetermined value SLt2. If it has reached, the process proceeds to S111, and if not, this routine is returned. Here, the order of the processing of S105 to 107 and the processing of S108 to 110 is switched, and it is determined whether or not the oil temperature Toil is in a region higher than the predetermined value T1 and the phase current Ii is equal to or less than the predetermined value SLi1. If the determination is made first and the determination result is NO, it may be determined whether or not the difference in rotation speed (= tNset−N) is equal to or less than a predetermined value SLn1.

  In S111, the idling determination determination flag Fjdg is set to 1, and it is determined that the idling of the electric oil pump 7 has occurred. In response to this determination, the control unit 4 outputs a warning display signal to the display device 21 and outputs a control signal for prohibiting execution of idle stop / start control to an engine control unit (not shown). . The engine control unit has a function of executing idle stop / start control of the engine 1, receives the control signal from the control unit 4, and suspends execution of idle stop / start control. The processing in this step realizes the function as “control signal output means”.

  In S112, the idling determination start flag Fstr is reset (Fstr = 0).

  In S113, the first and second timers TIM1, TIM2 are reset (TIM1 = 0, TIM2 = 0), respectively.

FIG. 3 is a flowchart showing the flow of the target rotational speed calculation process.
In S201, a diagnosis start determination process is executed, and the idle determination start flag Fstr is set to 1 when there is a suspicion (or a sign) of the occurrence of idle rotation. The diagnosis start determination process is performed according to the flow shown in the flowcharts of FIGS. 4 and 5 to 8.

  In S202, it is determined whether or not the idling determination start flag Fstr is 1. If it is 1, the process proceeds to S203. Otherwise, the process proceeds to S205.

  In S203, the target rotational speed tNset of the electric oil pump 7 is set to the determination target rotational speed. In the present embodiment, the target rotational speed for determination is set based on the oil temperature Toil, and as shown in FIG. 9, is set to increase with respect to the increase in the oil temperature Toil as a tendency throughout the temperature assumption range. However, in the low temperature range below T1, and the high temperature range above T2, it is set to a larger value compared to the other intermediate ranges (T1 to T2). Specifically, the target rotation speed for determination exceeds the upper limit value LMTn of a practically allowable range (control allowable range) for the electric oil pump 7 from the viewpoint of operation restriction regarding the brushless motor 71 in a low temperature range of T1 or less. On the other hand, in the high temperature range equal to or higher than T2, it is set within the range of the control allowable range equal to or lower than the upper limit value LMTn. In the present embodiment, the target rotational speed for determination set for the low temperature range is the maximum rotational speed determined from the rating of the brushless motor 71. On the other hand, in the intermediate range (T1 to T2), the rotational speed (required rotational speed described below) tNreq according to the operation request of the electric oil pump 7 is set. The processing in this step and the processing in S103 described above (rotational speed feedback control) realize the function as “determination control means”.

  In S204, the third timer TIM3 is counted up (for example, TIM3 = TIM3 + 1).

  In S205, the target rotational speed tNset of the electric oil pump 7 is set to the rotational speed (requested rotational speed tNreq) according to the operation request of the electric oil pump 7. In the present embodiment, the required rotational speed tNreq is set to increase linearly as the oil temperature Toil increases, as indicated by a two-dot chain line in FIG.

  In S206, the third timer TIM3 is reset (TIM3 = 0).

  In S207, it is determined whether or not the timer TIM3 after the count has reached a predetermined value SLt3. If reached, the process proceeds to S208, and if not reached, this routine is returned.

  In S208, the idling determination start routine Fstr is reset (Fstr = 0).

  In S209, the target rotational speed tNset of the electric oil pump 7 is set to the required rotational speed tNreq. As a result, when the occurrence of idling is not detected within the time determined by the predetermined value SLt3, the rotational speed of the electric oil pump 7 is reduced to the required rotational speed tNreq, so that the brushless motor 71 is continuously applied with a large load. It prevents excessive heat generation.

  In S210, the third timer TIM3 is reset (TIM3 = 0).

FIG. 4 is a flowchart showing the flow of the diagnosis start determination process.
In S301, a pump operation request detection process is executed according to the flow shown in the flowchart of FIG.

  In S302, the phase current decrease detection process is executed according to the flow shown in the flowchart of FIG.

  In S303, hunting detection processing is executed according to the flow shown in the flowcharts of FIGS.

  As described above, in the present embodiment, when the operation request for the electric oil pump 7 is generated and when there is a suspicion (or a sign) that the electric oil pump 7 is idle, the idling determination is executed. This may be performed periodically, such as every predetermined time.

FIG. 5 is a flowchart showing the flow of the pump operation request occurrence detection process.
In S401, it is determined whether or not the target rotational speed tNset of the electric oil pump 7 (required rotational speed tNreq since it is before the start of determination) is increased. For example, whether or not the difference (= tNset−tNset _n−1 ) between the current target rotation speed tNset and the previous target rotation speed tNset _n−1 (that is, in the routine before execution of one process) is greater than a predetermined value. judge. If it has increased, the process proceeds to S402, and otherwise, the process returns to the routine of FIG. 4 (hereinafter referred to as “determination basic routine”) showing the basic flow of the diagnosis start determination process.

In S402, it is determined whether or not the previous target rotational speed tNset _n-1 is zero. If it is 0, the process proceeds to S403. Otherwise, the process returns to the determination basic routine.

  In S403, the idling determination start flag Fstr is set to 1.

FIG. 6 is a flowchart showing the flow of the phase current decrease detection process.
In S501, it is determined whether or not the target rotational speed tNset (required rotational speed tNreq) of the electric oil pump 7 is constant. For example, the absolute value (= | tNset−tNset _n−m |) of the difference between the current target rotational speed tNset and the target rotational speed tNset _n−m before a predetermined time is calculated, and whether or not it is equal to or smaller than a predetermined value. Determine. If it is constant, the process proceeds to S502. Otherwise, the process returns to the determination basic routine.

  In S502, it is determined whether or not the current target rotational speed tNset is greater than zero. If it is greater than 0, the process proceeds to S503, and otherwise, the process returns to the determination basic routine.

In S503, it is determined whether or not the phase current Ii of the brushless motor 71 has decreased. The decrease in the phase current Ii is determined, for example, when the current phase current filter value Ii has decreased by a predetermined value or more than the phase current filter value Iin _-m before a predetermined time. When it decreases, it progresses to S504, and in other cases, it returns to the basic judgment routine. As described above, in the present embodiment, the suspicion of idling is determined using the phase current Ii. However, a decrease in the pump load is detected by a change in the feedback correction amount of the rotational speed control, and the feedback correction amount exceeds a predetermined value. You may be suspicious of that.

  In S504, the idling determination start flag Fstr is set to 1.

FIG. 7 is a flowchart showing the flow of the hunting detection process.
In S601, it is determined whether or not there is a pump operation request. If there is a pump operation request, the process proceeds to S602; otherwise, the process proceeds to S603.

In S602, the fourth timer TIM4 is counted up (for example, TIM4 = TIM4 + 1).
In S603, the fourth timer TIM4 is reset (TIM4 = 0).

  In S604, the phase current edge counter CNT is reset (CNT = 0).

  In S605, it is determined whether the timer TIM4 after counting up has reached a predetermined value SLt4. If it has reached, the process proceeds to S606, and if not, the process returns to the determination basic routine.

  In S606, the phase current Ii of the electric oil pump 7 is read.

  In S607, phase current edge determination processing is executed according to the flow shown in the flowchart of FIG.

  In S608, the fifth timer TIM5 is counted up (for example, TIM5 = TIM5 + 1).

  In S609, it is determined whether the timer TIM5 after counting up has reached a predetermined value SLt5. If reached, the process proceeds to S610, and if not reached (in other words, if the time is determined by the predetermined value SLt5 from the generation of the pump operation request), the process proceeds to S612.

  In S610, the phase current edge counter CNT is reset (CNT = 0).

  In S611, the fifth timer TIM5 is reset (TIM5 = 0).

  In S612, it is determined whether or not the phase current edge counter CNT has reached a predetermined value SLc1. If reached, the process proceeds to S613, and if not reached, the process returns to the basic determination routine. If the phase current level flags H and L are switched over a predetermined number of times SLc1 or more within a predetermined time from the generation of the pump operation request, it is determined that hunting has occurred. The hunting of the phase current Ii can be caused mainly by pressure pulsation due to air bubbles mixed into the oil passage. Therefore, from the detection of hunting, it is possible to determine the suspected occurrence of idling due to the mixing of bubbles.

  In S613, the idling determination start flag Fstr is set to 1.

FIG. 8 is a flowchart showing the flow of the phase current edge count process.
In S701, it is determined whether or not the phase current Ii is larger than an upper limit level threshold (hereinafter referred to as “high level threshold”). If it is larger than the high level threshold, the process proceeds to S702, and otherwise, the process proceeds to S703.

  In S702, the phase current level flag is set to a value H indicating a high level.

  In S703, it is determined whether or not the phase current Ii is smaller than a lower level threshold (hereinafter referred to as “low level threshold”). If it is smaller than the low level threshold, the process proceeds to S704, and otherwise, the process proceeds to S705.

  In S704, the phase current level flag is set to a value L indicating a low level.

  In S705, it is determined whether or not the phase current level flag has changed between the previous time and the current time. If a change has occurred, the process proceeds to S706, and if not, the process returns to the determination basic routine.

  In S706, the phase current edge counter CNT is incremented by a predetermined value (for example, 1).

  FIG. 10 is an explanatory diagram showing an example of changes in the actual rotational speed N and the phase current Ii of the brushless motor 71 when normal and when idling occurs. The effects obtained by this embodiment will be described below together with the operation of this embodiment with reference to FIG. In the figure, with respect to both the rotational speed N and the phase current Ii, a normal one is indicated by a thick solid line (Nnrm, Inrm), and a non-rotating occurrence is indicated by a thin solid line (Nidl, Iidl).

  In the present embodiment, as shown in FIG. 9, the target rotational speed tNset of the electric oil pump 7 is set to a value that exceeds the upper limit rotational speed LMTn in the low temperature range of T1 or less when performing the idling determination, In the high temperature range, it is set within the range of the control allowable range below the upper limit rotational speed LMTn, and in the other intermediate range, it is set to a value (required rotational speed tNreq) according to the operation request of the electric oil pump 7.

  With such a setting, it is possible to determine the occurrence of idling without increasing power consumption in the intermediate range, and it is also possible to easily determine the occurrence of idling in the low temperature range and the high temperature range. And it is possible to detect idling not only in the intermediate range but also in the low temperature range and the high temperature range, so that the idling can be detected immediately after the occurrence and measures to avoid problems caused by insufficient oil amount or hydraulic pressure. Can be taken. For example, in the present embodiment, the electric oil pump 7 and the brushless motor in the case of performing an increase output control that compensates for an operation failure due to insufficient hydraulic pressure in the starting clutch 2 and the continuously variable transmission 3 or an insufficient supply of oil. It is possible to avoid applying an excessive drive request to 71. When the drive request for the electric oil pump 7 or the like becomes excessive, the electric oil pump 7 and the brushless motor 71 cause excessive rotation, which causes excessive heat generation in the electric oil pump 7 or the like, or erroneous pump abnormality. There is a risk of making a diagnosis. In addition to the above, when the sliding portion is lubricated and cooled by the oil pumped up by the electric oil pump 7 as will be described later, it is possible to avoid seizure due to insufficient supply of oil.

  Referring to FIG. 10, in a low temperature range of T1 or less, the phase current Ii (Inrm) increases from the viewpoint of the operation restriction regarding the brushless motor 71 with respect to the increase in pump resistance (oil viscous friction resistance) due to the increase in oil viscosity. Therefore, the difference (= Inrm−Iidl) in the phase current Ii between the normal time and the idling occurrence is reduced, and the determination based on the phase current Ii becomes difficult. Here, when the target rotational speed tNset is significantly increased beyond the control allowable range, the phase current Inrm reaches the upper limit value at the normal time when the idling does not occur, whereby the rotational speed Nnrm of the electric oil pump 7 is reached. Does not follow the target rotational speed tNset, and the difference from the target rotational speed tNset increases. On the other hand, when the idling occurs, the phase current Iidl does not reach the upper limit value and the operation restriction does not work, so the rotational speed Nidl of the electric oil pump 7 changes following the target rotational speed tNset. Therefore, in the low temperature range, it is possible to easily determine the occurrence of idling by monitoring the actual fluctuation of the rotational speed N with respect to the increase in the target rotational speed tNset.

  On the other hand, in the high temperature range of T2 or higher, the pump resistance decreases due to a decrease in oil viscosity, so the difference in phase current Ii between normal and idle occurrence is reduced, and determination based on phase current Ii is difficult. Become. Here, this tendency is remarkable in the electric oil pump 7 having a large pump section clearance and a small oil discharge flow rate for the same rotation speed. Specifically, in the electric oil pump 7 having a large pump section clearance, the phase current Iref becomes relatively small because the pump discharge flow rate is small even if the idling does not occur, and the idling occurs although the pump section clearance is small. This makes it difficult to distinguish it from the pump (phase current Iidl). According to the present embodiment, the target rotational speed tNset is increased from the required rotational speed tNreq when the idling determination is performed, and the rotational speed N of the electric oil pump 7 is intentionally increased, so that normal operation and idling occur. The phase current Ii difference (= Inrm−Iidl) can be enlarged, and the occurrence of idling can be determined by the phase current Ii.

  In the intermediate range, the effect of oil viscosity is not significant, and a difference sufficient for determination occurs in the phase currents Inrm and Iidl between the normal time and the idling occurrence. Therefore, the electric oil pump 7 is operated at the required rotational speed tNreq. The occurrence of idling can be determined based on whether the phase current Ii of the brushless motor 71 is larger or smaller than the predetermined value SLi1.

  As a matter of course, the predetermined values SLn1 and SLi1 for determining the occurrence of idling are preferably set to optimum values according to the oil temperature Toil. When the determination is made based on the phase current Ii, the predetermined value SLi1 is set with a decreasing tendency with respect to the increase in the oil temperature Toil, and each of the region on the lower temperature side than the region T2 and the region on the higher temperature side than this. The phase currents Inrm and Iidl at the normal time and when the idling occurs may be adapted so as to be distinguishable.

  In the above description, the case where the electric oil pump 7 is installed in the oil passage that bypasses the mechanical oil pump 6 and the fastening oil pressure of the start clutch 2 is formed by the electric oil pump 7 is described. It can also be applied when the pump 6 and the electric oil pump 7 are installed in independent oil passages. For example, the vehicle transmission system shown in FIG. 11 includes the start clutch 2 and the like independent of the first hydraulic system that forms the engagement hydraulic pressure of the start clutch 2 and the shift hydraulic pressure of the continuously variable transmission 3 by the mechanical oil pump 6. A second hydraulic system for lubrication and cooling is provided, and an electric oil pump 7 is installed in the second hydraulic system. In the low temperature range (Toil ≦ T1) where the oil viscosity increases, the target rotation speed tNset of the electric oil pump 7 is increased beyond the control allowable range when determining the idling, so that the rotation speed N between normal time and idling occurs. The difference (= Nnrm−Nidl) is enlarged and determined by the rotational speed N. On the other hand, by increasing the target rotational speed tNset above the required rotational speed tNreq in a high temperature range (Toil ≧ T2) where the oil viscosity decreases, The difference (= Inrm−Iidl) in the phase current Ii between the normal time and the idling occurrence can be enlarged and determined by the phase current Ii. In this way, it is possible to determine the idling even in the low temperature range and the high temperature range where the determination based on the pump load under the required rotation speed is difficult, and after waiting for the idling to occur, the transition to the intermediate range is awaited. And measures can be taken to avoid problems caused by insufficient supply of oil to the sliding portion. For example, when it is determined that idling occurs, the execution of idle stop / start control is prohibited, thereby avoiding idle stop under insufficient lubrication and cooling conditions and preventing seizure in the starting clutch 2. be able to.

  Further, the present invention is not limited to a frictional joint element typified by a clutch or the like, and can be applied to an electric oil pump that supplies oil to various sliding parts and heat generating parts that require lubrication and / or cooling. is there.

  Furthermore, in the above description, the case where the target rotational speed for determination higher than the required rotational speed tNreq is set in both the low temperature range and the high temperature range has been described. The region where the target rotational speed tNset is increased is only one of the low temperature region and the high temperature region, and other regions (relatively high temperature region excluding the low temperature region or relatively low temperature region excluding the high temperature region). Then, the determination may be made by monitoring the decrease in the phase current Ii under the required rotational speed tNreq. In actual application, there is a case where there is a region that can be determined by any of the determination based on the rotation speed N and the determination based on the phase current Ii (no misdiagnosis). In such a case, Any determination method may be used, and an intermediate point for switching the determination method may be set in the region.

  Furthermore, in the above description, when performing the idling determination, the target rotation speed for determination is switched between the high temperature region of T2 or higher and the intermediate region (T1 to T2), and in the intermediate region, the required rotational speed tNreq is set as the target rotation speed for determination. On the other hand, a determination target rotational speed higher than the required rotational speed tNreq is set in the high temperature range. However, the present invention is not limited to this, and a determination target rotational speed higher than the required rotational speed tNreq may be set over the entire region (for example, a region on the higher temperature side than T1) where occurrence of idling is determined by the pump load. (See dotted line in FIG. 9).

  Further, when the electric oil pump 7 is assembled, repaired, or replaced, the electric oil pump 7 rotates for a predetermined number of times when the power is turned on for the first time until the oil is filled in the pump and the piping. This determination may be prohibited. Thereby, it is possible to prevent erroneous determination in an empty state after assembly or the like.

  Technical ideas other than those described in the claims, which can be understood from the description of the embodiment described above, are described below.

  In the additional first aspect, the control device for the electric oil pump sets a target rotational speed for determination higher than the required rotational speed corresponding to the operation request of the electric oil pump, and determines the rotational speed of the electric oil pump. A determination time control means for executing control of the electric motor to obtain a target rotational speed, and a pump operating state detecting means for detecting an operating state of the electric oil pump while the electric motor is being controlled. A non-revolution determination unit that determines the occurrence of idle rotation in the electric oil pump based on the operation state detection value detected by the pump operation state detection unit, and a control signal that outputs a control signal according to a determination result by the non-revolution determination unit And an output means for controlling the electric oil pump.

  Here, the process of S203 of the flowchart shown in FIG. 3 and the process of S103 of the flowchart shown in FIG. 2 realize the function as the “control unit at the time of determination”, and the processes of S105 and 108 of the flowchart shown in FIG. The functions as “operation state detecting means” and “idle state determining means” are realized, and the processing of S111 in the flowchart shown in FIG. 2 realizes the function as “control signal output means”.

  The operating state of the electric oil pump may be an actual number of revolutions of the electric oil pump during execution of the control of the electric motor, wherein the determination time control means is configured such that the oil is in a low temperature state. It is preferable that the determination target rotational speed is switched between the case where the engine speed is in the case and the other case, and the target rotational speed for determination higher than the required rotational speed is set only when the temperature is in the low temperature state.

  The operating state of the electric oil pump may be a load of the electric oil pump during execution of the control of the electric motor, wherein the determination time control unit is configured such that the oil is in a high temperature state. It is preferable that the determination target rotation speed is switched between the other cases and the determination target rotation speed higher than the required rotation speed is set only when the temperature is high.

  In the second additional form, the control device for the electric oil pump sets a target rotation speed for determination higher than the required rotation speed according to the operation request of the electric oil pump, and determines the rotation speed of the electric oil pump. A determination time control means for executing control of the electric motor to achieve the target rotational speed, and control of the electric motor in a first region where the temperature of the oil is lower than the first temperature. Based on the rotation speed detected by the rotation speed detection means and the rotation speed detected by the rotation speed detection means, the occurrence of idling in the electric oil pump in the first region is detected. A first idling determination means for determining, and a load of the electric oil pump during execution of the control of the electric motor in the second region where the temperature of the oil is higher than the second temperature A pump load detecting means for detecting as a pump load, and a second idling determination means for judging the occurrence of idling in the electric oil pump in the second region based on the pump load detected by the pump load detecting means. And a control signal output means for outputting a control signal according to the determination result by the first and second idling determination means.

  Here, the process of S203 of the flowchart shown in FIG. 3 and the process of S103 of the flowchart shown in FIG. 2 realize the function as “control unit at the time of determination”, and the process of S105 of the flowchart shown in FIG. Means "and" first idling determination means ", and the processing of S108 in the flowchart shown in FIG. 2 realizes functions as" pump load detection means "and" second idling determination means " The processing of S111 in the flowchart shown in FIG. 2 realizes a function as “control signal output means”. An area equal to or smaller than the predetermined value T1 shown in FIG. 9 corresponds to a “first area”, and an area equal to or larger than the predetermined value T2 corresponds to a “second area”.

  The control device for the electric oil pump further includes oil temperature detection means for detecting the temperature of the oil, and the determination time control means is configured to determine the target rotation speed for determination based on the oil temperature detected by the oil temperature detection means. It is good to set. The process of S102 in the flowchart shown in FIG. 2 realizes the function as “oil temperature detecting means”.

  The determination target rotational speed set for the first region may be a value larger than the determination target rotational speed set for the second region.

  DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine, 2 ... Starting clutch, 2a ... Input side clutch plate, 2b ... Output side clutch plate, 3 ... Continuously variable transmission, 31 ... Primary pulley, 32 ... Secondary pulley, 33 ... Belt, 4 ... Control unit, DESCRIPTION OF SYMBOLS 5 ... Pressure regulator, 6 ... Mechanical oil pump, 7 ... Electric oil pump, 71 ... Electric motor (brushless motor), 8 ... Oil pan, 9 ... Check valve, 11 ... Temperature sensor, 21 ... Display device.

Claims (3)

A control device for an electric oil pump that supplies oil using an electric motor as a power source,
Setting the target rotational speed for determination higher than the required rotational speed corresponding to the operation request of the electric oil pump, and controlling the electric motor to make the rotational speed of the electric oil pump set to the target rotational speed for determination A determination time control means to be executed;
A rotational speed detection means for detecting an actual rotational speed of the electric oil pump while executing control of the electric motor;
Idling determination means for determining occurrence of idling in the electric oil pump based on the number of revolutions detected by the revolution number detection means;
Control signal output means for outputting a control signal according to the determination result by the idling determination means;
An electric oil pump control device comprising: It further comprises oil temperature detecting means for detecting the temperature of the oil,
The determination time control means sets the determination target rotational speed based on the oil temperature detected by the oil temperature detection means.
The control device for the electric oil pump according to claim 1. The target rotational speed for determination is a rotational speed having a value larger than an upper limit rotational speed at which the rotational speed of the electric oil pump can be increased when the electric oil pump is in a normal state other than the idling state where the idling occurs. Is,
The control apparatus of the electric oil pump of Claim 1 or 2.