JP2020008051A - Sticking detection device of oil pump - Google Patents

Abstract

To provide a sticking detection device of an oil pump capable of preventing overshoot of an oil pressure immediately after termination of sticking determination.SOLUTION: A target oil pressure setting portion 150b sets a value higher than a maximum pressure in a partial discharge state, as a target oil pressure for diagnosis to determine whether an oil pump 10 sticks or not. A discharge state switching portion 150a executes control to switch the discharge state of the oil pump 10 to the partial discharge state. A pressure regulation portion 150c temporarily stops an accumulation operation of integration term for regulating a control value according to time integration of deviation between the target oil pressure for diagnosis and the oil pressure, when the control for switching the discharge state of the oil pump 10 to the partial discharge state is executed in regulating the oil pressure to be coincident with the target oil pressure for diagnosis. The sticking determination portion 150d determines whether the oil pump 10 sticks in a full discharge state or not on the basis of a relationship between an oil pressure after performing the control to switch the discharge state to the partial discharge state and a maximum pressure of the partial discharge state.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an oil pump sticking detection device that detects whether an oil pump that can be switched between a full discharge state and a partial discharge state is stuck.

  An automatic transmission for a vehicle (for example, a stepped automatic transmission (Step AT), a continuously variable transmission (CVT), or the like) includes an oil pump that is driven by engine power and discharges high-pressure oil. Various functions such as speed change and forward / reverse switching are realized by regulating the pressure of the discharged high-pressure oil and supplying it.

  On the other hand, in recent years, there has been a demand for reduction of the load (loss) of an oil pump in order to improve the fuel efficiency of a vehicle. As an oil pump capable of reducing such a load, for example, an oil pump having a function of switching a discharge state (discharge flow rate) using a switching solenoid, that is, two discharge ports are completely shut off from a suction port. An oil pump (variable displacement pump) that can be switched to a full discharge state (full capacity operation state) or a half discharge state (half capacity operation state) in which one of two discharge ports is connected to a suction port is practical. Has been

  By the way, if such an oil pump is stuck in the full discharge state, the load cannot be reduced (that is, the fuel efficiency cannot be improved). On the other hand, if it is fixed in a half discharge state, there is a possibility that a required oil flow rate cannot be supplied to an automatic transmission or the like. Therefore, Patent Document 1 discloses an abnormality detection device for a hydraulic circuit that detects sticking of a switching unit that switches an oil pump between a full discharge state and a half discharge state.

  More specifically, the abnormality detection device includes a switching control unit that performs switching control for switching to a half-discharge state, and a pressure regulation that performs pressure regulation so that the target line pressure is higher than the maximum discharge pressure in the half-discharge state. A control unit, and a determination unit that determines that the switching solenoid valve and / or the switching valve is in a stuck abnormality in the full discharge state when the line pressure detected by the line pressure detection sensor is higher than the maximum discharge pressure in the half discharge state. ing. That is, in this abnormality detection device, the diagnostic target hydraulic pressure is increased to a value that cannot be discharged in the half-discharge state, and if the actual pressure increases to the diagnostic target hydraulic pressure (that is, a value that cannot be output in the half-discharge state), It is determined to be abnormal (the oil pump is stuck in all discharge states), and otherwise to be normal.

JP-A-2017-106581

  As described above, according to the abnormality detection device described in Patent Literature 1, at the time of sticking determination, the target hydraulic pressure for diagnosis is increased to a value that cannot be discharged in the half-discharge state (that is, it is set to the half-discharge high-pressure state). ). Here, for example, when the accelerator pedal is greatly depressed substantially at the same time as the termination of the fixation determination, the required flow rate cannot be covered by the half discharge, and the oil pump is switched to the full discharge state. However, at that time, the hydraulic control circuit may be in an unnecessarily high pressure control state in all discharges, and there is a possibility that hydraulic overshoot may occur.

  The present invention has been made in order to solve the above problems, and in an oil pump sticking detection device that detects whether an oil pump that can be switched between a full discharge state and a partial discharge state is stuck, It is an object of the present invention to provide an oil pump sticking detection device capable of preventing an overshoot of oil pressure immediately after completion (or interruption) of the sticking determination.

  An oil pump sticking detection device according to the present invention includes an oil pump that pressurizes oil sucked from an inlet and discharges the oil from a plurality of outlets, and a discharge state of the oil pump. In a partially discharged state in which all of the discharge ports communicate with each other, or in which some of the plurality of discharge ports are in communication with the high-pressure oil passage and some of the other discharge ports are in communication with the suction port of the oil pump; A discharge state switching means for switching, a target oil pressure setting means for setting a target oil pressure which is a control target value of the oil pressure of the high pressure oil passage, and a feedback control based on a deviation between the target oil pressure and the oil pressure of the high pressure oil passage. It is determined whether or not the oil pump is stuck in the full discharge state or the partial discharge state based on the pressure adjusting means for adjusting the oil pressure of the road so as to match the target oil pressure and the oil pressure adjusted by the pressure adjusting means. Sticking judgment When performing the sticking determination to determine whether or not the oil pump is stuck, the target oil pressure setting means sets the oil pump in the full discharge state or the partial discharge state instead of the target oil pressure. As a target hydraulic pressure for diagnosis for determining whether or not it is set, a value higher than the maximum pressure in the partial discharge state is set, the discharge state switching means performs control to set the discharge state of the oil pump to the partial discharge state, When the pressure regulating means regulates the hydraulic pressure so as to match the target hydraulic pressure for diagnosis, and when the control for changing the discharge state of the oil pump to the partial discharge state is performed, the deviation of the hydraulic pressure between the target hydraulic pressure for diagnosis and the hydraulic pressure is controlled. The accumulation operation of the integral term for adjusting the control value in accordance with the time integration is temporarily stopped, and the sticking determination means determines the difference between the hydraulic pressure after the control for setting the partial discharge state and the maximum pressure in the partial discharge state. Oil based on the relationship Amplifier is characterized by determining whether or not secured by the full discharge state.

  According to the oil pump sticking detection device of the present invention, when the discharge state of the oil pump is controlled to the partial discharge state, and the diagnostic target hydraulic pressure is set to a value higher than the maximum pressure in the partial discharge state, Then, the accumulation (feedback) of the integral term for adjusting the control value in accordance with the time integration of the deviation between the target hydraulic pressure for diagnosis and the hydraulic pressure is temporarily stopped. That is, when the target oil pressure for diagnosis and the actual oil pressure are intentionally deviated from each other, accumulation of unnecessary integral terms (I terms) is stopped. For this reason, for example, even when the accelerator pedal is depressed substantially at substantially the same time as the termination of the sticking determination, it is possible to prevent the hydraulic control circuit from being in an unnecessarily high pressure control state in all discharges. As a result, it is possible to prevent the hydraulic pressure from overshooting immediately after the completion of the sticking determination (or suspension).

  In addition, the oil pump sticking detection device according to the present invention further includes a control value storage unit that stores a value of the integral term when the accumulation operation of the integral term is temporarily stopped. When restarting the stopped accumulation of the integral term, it is preferable to restart the accumulation of the integral term by using the value of the integral term stored in the storage means.

  In this case, the value of the integral term when the accumulation operation of the integral term is temporarily stopped is stored, and when the accumulation operation of the temporarily stopped integral term is restarted, the stored integral term is stored. The accumulation operation of the integral term is restarted using the value of. Therefore, when the accumulation operation of the integration term that has been stopped is restarted, it is possible to continuously restart from the control state when the accumulation operation of the integration term was stopped.

  The sticking detection device for an oil pump according to the present invention further includes a start state storage unit that stores an engine torque and a gear ratio when the sticking determination is started, and the discharge state switching unit performs a predetermined time after the end of the sticking determination. Until elapses, the engine torque and the gear ratio stored in the start state storage means are set as respective upper limit values, and the discharge state of the oil pump is determined based on the engine torque and the gear ratio of the continuously variable transmission. Switching is preferably performed.

  In this case, the engine torque and the gear ratio at the start of the sticking determination are stored, and the stored engine torque and the gear ratio are set to the respective upper limit values until the predetermined time elapses after the sticking determination is completed. The switching of the discharge state of the oil pump is performed based on the torque of the engine and the gear ratio of the continuously variable transmission. Therefore, for example, even when the accelerator pedal is depressed substantially simultaneously with the termination of the sticking determination (that is, when the engine torque increases), the oil pump is kept in the full discharge state until a predetermined time elapses. Switching is prevented. Therefore, the hydraulic control circuit is prevented from entering the high-pressure control state in all discharges. As a result, it is possible to prevent the hydraulic pressure from overshooting immediately after the completion of the sticking determination (or suspension).

  Further, in the oil pump sticking detection device according to the present invention, the discharge state switching means changes the engine torque and the gear ratio used for switching the discharge state by a predetermined change after a lapse of a predetermined time after the end of the sticking determination. It is preferable that the actual engine torque and the gear ratio be made closer to the actual engine torque and the gear ratio from the engine torque and the gear ratio stored in the start state storage means.

  In this case, after a lapse of a predetermined time after the end of the sticking determination, the engine torque and the gear ratio used for switching the discharge state are changed by a predetermined amount and stored in the stored engine torque and gear ratio (that is, the sticking determination). From the engine torque and the gear ratio at the time of the start), the actual engine torque and the gear ratio can be approximated. Therefore, it is possible to gradually approach the actual (real-time) engine torque and gear ratio from the engine torque and gear ratio at the time of starting the sticking determination.

The sticking detection device for an oil pump according to the present invention further includes a sticking determination prohibiting unit that suspends execution of a sticking determination that determines whether the oil pump is stuck.
When the rotation speed of the engine that drives the oil pump is equal to or higher than a predetermined rotation speed,
If the temperature of the oil is below the predetermined temperature,
If the speed of the vehicle is less than the predetermined speed,
When the deviation between the average value of the vehicle speed in the predetermined period and the maximum and minimum values of the vehicle speed in the predetermined period is equal to or higher than the predetermined speed,
When the change speed or the change amount of the accelerator opening is a predetermined value or more,
When the deviation between the maximum pressure in the partial discharge state and the target hydraulic pressure for normal control set according to the operation state is less than a predetermined pressure,
If the amount of change in the gear ratio is equal to or greater than a predetermined value, assuming that the accelerator opening has changed by the predetermined opening,
When the deviation between the accelerator opening and the accelerator opening for kickdown determination for determining whether to perform kickdown for changing the gear ratio to the low side is less than a predetermined opening,
When the deviation between the target hydraulic pressure and the actual hydraulic pressure of the high-pressure oil passage is equal to or more than a predetermined value, and when the state in which the deviation is less than a predetermined value does not continue for a first predetermined time or more,
When the control for changing the discharge state of the oil pump to the partial discharge state is not continued for the second predetermined time or more,
When the deviation between the maximum pressure in the partial discharge state and the target hydraulic pressure for diagnosis is less than a predetermined pressure,
And at least one of the conditions in which the opening of the valve for adjusting the oil pressure supplied to the oil chamber of the pulley constituting the continuously variable transmission via the high-pressure oil passage is equal to or greater than a predetermined opening is satisfied. In such a case, it is preferable that the execution of the sticking determination by the target oil pressure setting unit, the pressure adjusting unit, the discharge state switching unit, and the sticking determining unit be interrupted.

  With this configuration, when at least one of the above-described predetermined interruption conditions is satisfied, the fixation determination is interrupted. Therefore, it is possible to reduce a sense of incongruity due to abnormal noise caused by the oil pump being in a partial discharge high pressure state, to protect hardware constituting the automatic transmission, and to prevent erroneous detection of a determination of sticking. Becomes possible.

  Further, in the sticking detection device of the oil pump according to the present invention, after the sticking determination means is controlled to perform the partial discharge state, if the hydraulic pressure is equal to or less than the maximum pressure in the partial discharge state, the sticking is determined in the full discharge state. When it is determined that the pressure is not higher than the maximum pressure in the partial discharge state, it is preferable to determine that the oil pressure is fixed in the full discharge state.

  With this configuration, it is possible to accurately determine whether or not the oil pump is stuck in the full discharge state based on the relationship between the hydraulic pressure after the control of the partial discharge state and the maximum pressure in the partial discharge state. Can be determined.

  In the oil pump sticking detection device according to the present invention, when performing the sticking determination to determine whether or not the oil pump is stuck in the full discharge state or the partial discharge state, the discharge state switching unit includes the oil pump discharge state. The target hydraulic pressure setting means sets a value higher than the maximum pressure in the partial discharge state as the target pressure for diagnosis, and the pressure adjusting means sets the hydraulic pressure to match the target hydraulic pressure for diagnosis. After that, the discharge state switching means performs control to switch the discharge state of the oil pump from the full discharge state to the partial discharge state, and the sticking determination means performs control to switch from the full discharge state to the partial discharge state. If the hydraulic pressure has decreased by a predetermined value or more within a predetermined time after being released, it is determined that the oil pressure has not been fixed in all discharge states, and if the oil pressure has not decreased by a predetermined value or more, it has been determined that the oil pressure has been fixed in all discharge states. It is preferable that the constant.

  In this case, when the fixation determination is performed to determine whether the oil pump is stuck in the full discharge state or the partial discharge state, first, control is performed so that the discharge state of the oil pump is set to the full discharge state. A value higher than the maximum pressure in the partial discharge state is set as the diagnosis target hydraulic pressure for determining whether the oil pump is stuck in the full discharge state or the partial discharge state, and the hydraulic pressure in the high pressure oil passage is diagnosed. Pressure is adjusted to match the target hydraulic pressure. That is, when the actual oil pressure is increased so as to match the target oil pressure for diagnosis, by controlling to the full discharge state, the time to be in the partial discharge state in the normal state (that is, when the partial discharge is not fixed) is set. Can be reduced. Then, thereafter, control is performed to switch the discharge state of the oil pump from the full discharge state to the partial discharge state, and within a predetermined time, if the oil pressure drops by a predetermined value or more, it is determined that the oil discharge is not fixed in the full discharge state, If the oil pressure does not decrease by a predetermined value or more, it is determined that the oil pressure is fixed in all discharge states. Therefore, after the control for switching from the full discharge state to the partial discharge state is performed, it is possible to determine the presence or absence of the full discharge fixation in a relatively short time. As described above, it is possible to shorten the time of the partial discharge state, that is, to shorten the time of occurrence of abnormal noise that can occur in the partial discharge high pressure state.

  Further, in the oil pump sticking detection device according to the present invention, the sticking determination means sets the oil pressure to a predetermined value within a predetermined time after the control of switching the discharge state of the oil pump from the full discharge state to the partial discharge state is performed. If the oil pressure drops below the maximum pressure in the partial discharge state, it is determined that it is not fixed in all discharge states, and if the oil pressure has not decreased by a predetermined value or more, or if the oil pressure is in the partial discharge state, If the pressure does not drop below the maximum pressure, it is preferable to determine that the ink is fixed in all ejection states.

  In this case, after the control for switching the discharge state of the oil pump from the full discharge state to the partial discharge state is performed, within a predetermined time, the hydraulic pressure decreases by a predetermined value or more, and the hydraulic pressure falls below the maximum pressure of the partial discharge state. If it has decreased, it is determined that it has not been fixed in the full discharge state.If the oil pressure has not decreased by a predetermined value or more, or if the oil pressure has not dropped below the maximum pressure in the partial discharge state, it has been fixed in the full discharge state. It is determined that there is. That is, the determination of all the ejection sticking is performed based on the value of the oil pressure in addition to the decrease amount of the oil pressure. Therefore, it is possible to more reliably determine the fixing of all ejections in a relatively short time (that is, while reducing the holding time in the partial ejection state).

  In the sticking detection device for an oil pump according to the present invention, it is preferable that the sticking determination unit sets the predetermined value based on the engine speed and the oil temperature.

  By the way, the discharge pressure of the oil pump changes depending on the rotation speed of the engine that drives the oil pump and the oil temperature. In this case, since the predetermined value is set based on the engine speed and the oil temperature, it is possible to more accurately determine whether or not the entire discharge is fixed.

  In the sticking detection device for an oil pump according to the present invention, when the sticking determination means is controlled so that the oil pump discharge state is set to the full discharge state, the regulated hydraulic pressure is changed to the partial discharge state. When the pressure exceeds the maximum pressure, it is determined that the pressure is not fixed in the partial discharge state, and when the hydraulic pressure does not increase beyond the maximum pressure in the partial discharge state, it is determined that the pressure is fixed in the partial discharge state. preferable.

  In this case, if the regulated hydraulic pressure increases beyond the maximum pressure in the partial discharge state while the discharge state of the oil pump is controlled to the full discharge state, the oil is fixed in the partial discharge state. If it is determined that there is no pressure and the hydraulic pressure does not increase beyond the maximum pressure in the partial discharge state, it is determined that the oil pressure is fixed in the partial discharge state. Therefore, in a normal state (that is, when partial ejection is not fixed), it is possible to reduce the time required for the partial ejection state by determining the presence or absence of partial ejection while maintaining the entire ejection state.

  In the sticking detection device for an oil pump according to the present invention, when performing the sticking determination, the target oil pressure setting unit gradually decreases the diagnosis target oil pressure to a value exceeding the maximum pressure in the partial discharge state with a constant inclination. Preferably.

  In this case, the target pressure for diagnosis is gradually increased with a constant slope to a value exceeding the maximum pressure in the partial discharge state so that the actual oil pressure can follow when performing the sticking determination. Therefore, it is possible to prevent an erroneous determination by increasing the target hydraulic pressure for diagnosis in consideration of the followability (delay) of the hydraulic pressure.

  In the sticking detection device for an oil pump according to the present invention, the target oil pressure setting unit raises the target oil pressure for diagnosis to a value exceeding the maximum pressure in the partial discharge state, and then holds the target oil pressure for diagnosis to determine the sticking. It is preferable that the means starts, when a predetermined time has elapsed after the diagnostic target hydraulic pressure has risen to a value exceeding the maximum pressure in the partial discharge state, whether or not the fixation has occurred in the partial discharge state.

  In this case, after the target hydraulic pressure for diagnosis is increased to a value exceeding the maximum pressure in the partial discharge state, the target hydraulic pressure for diagnosis is held (fixed), and the target hydraulic pressure for diagnosis exceeds the maximum pressure in the partial discharge state. After the predetermined value elapses after the value has risen to the value, the determination as to whether or not the ink is stuck in the partial discharge state is started. Therefore, erroneous determination can be prevented by starting the determination in consideration of the followability (delay) of the hydraulic pressure.

  In the sticking detection device for an oil pump according to the present invention, the sticking determination means determines the maximum pressure in the partial discharge state based on the engine speed and the oil temperature, and sets the target hydraulic pressure for diagnosis. Is preferred.

  As described above, the discharge pressure of the oil pump changes according to the engine speed and the oil temperature. In this case, the maximum pressure in the partial discharge state is determined based on the engine speed and the oil temperature, and the target hydraulic pressure for diagnosis is set. Therefore, it is possible to perform the sticking determination with higher accuracy.

  According to the present invention, in an oil pump sticking detection device that detects whether an oil pump that can be switched between a full discharge state and a partial discharge state is stuck, an oil pressure overrun immediately after completion (or interruption) of the sticking determination. Shooting can be prevented.

It is a figure showing composition of a sticking detection device of an oil pump concerning an embodiment. It is a figure showing the composition of the continuously variable transmission to which the sticking detection device of the oil pump concerning an embodiment is applied. It is a figure for explaining the sticking detection method by the sticking detection device of the oil pump concerning an embodiment. It is a figure for explaining the reduction effect of hydraulic overshoot at the time of completion of sticking judgment by the sticking detection device of the oil pump concerning an embodiment. It is a flow chart which shows the processing procedure of the sticking detection processing by the sticking detection device of the oil pump concerning the embodiment (the first page). It is a flowchart which shows the processing procedure of the sticking detection processing by the sticking detection apparatus of the oil pump which concerns on embodiment (2nd page).

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts have the same reference characters allotted. In each of the drawings, the same elements are denoted by the same reference numerals, and redundant description will be omitted.

  First, the configuration of the oil pump sticking detection device 1 according to the embodiment will be described with reference to FIGS. 1 and 2. The oil pump sticking detection device 1 detects the sticking of the oil pump 10 in a full discharge state or a half discharge state (corresponding to a partial discharge state described in the claims). Here, a case where the present invention is applied to a continuously variable transmission (CVT) 110 will be described as an example. FIG. 1 is a diagram illustrating a configuration of a sticking detection device 1 of an oil pump. FIG. 2 is a diagram showing a configuration of a continuously variable transmission 110 to which the oil pump sticking detection device 1 is applied.

  The continuously variable transmission 110 is connected to a crankshaft of the engine 160 via, for example, a torque converter (not shown), and converts and outputs a driving force from the engine 160. The continuously variable transmission 110 has a primary shaft (input shaft) 120 connected to the output shaft of the torque converter, and a secondary shaft (output shaft) 130 arranged in parallel with the primary shaft 120.

  A primary pulley 121 is provided on the primary shaft 120. The primary pulley 121 has a fixed pulley 121a joined to the primary shaft 120, and a movable pulley (sheave) that is slidably mounted in the axial direction of the primary shaft 120 and non-rotatably opposed to the fixed pulley 121a. 121b, and the gap between the cone surfaces of the respective pulleys 121a and 121b, that is, the pulley groove width can be changed. On the other hand, the secondary shaft 130 is provided with a secondary pulley 131. The secondary pulley 131 includes a fixed pulley 131a joined to the secondary shaft 130, and a movable pulley (sheave) that is slidably mounted in the axial direction of the secondary shaft 130 and non-rotatably opposed to the fixed pulley 131a. 131b so as to be able to change the pulley groove width.

  A chain 140 for transmitting a driving force extends between the primary pulley 121 and the secondary pulley 131. By changing the groove width of the primary pulley 121 and the secondary pulley 131 and changing the ratio of the winding diameter of the chain 140 to each of the pulleys 121 and 131 (pulley ratio), the speed ratio is steplessly changed. If the winding diameter of the chain 140 around the primary pulley 121 is Rp, and the winding diameter of the chain 140 around the secondary pulley 131 is Rs, the speed ratio i is represented by i = Rs / Rp. The shift speed is represented by di / dt.

  Here, a primary drive oil chamber (hydraulic cylinder chamber) 122 is formed in the primary pulley 121 (movable pulley 121b). On the other hand, a secondary drive oil chamber (hydraulic cylinder chamber) 132 is formed in the secondary pulley 131 (movable pulley 131b). The groove width of each of the primary pulley 121 and the secondary pulley 131 is set and changed by adjusting the primary hydraulic pressure introduced into the primary driving oil chamber 122 and the secondary hydraulic pressure introduced into the secondary driving oil chamber 132.

  The hydraulic pressure for shifting the continuously variable transmission 110, that is, the above-described primary hydraulic pressure and secondary hydraulic pressure, is controlled by a control valve (valve body). The control valve opens and closes an oil passage formed therein by using a plurality of spool valves and a solenoid valve (solenoid valve) that moves the spool valve, so that the hydraulic pressure (hereinafter, “line pressure”) discharged from the oil pump 10 is controlled. ) Is supplied to the primary drive oil chamber 122 and the secondary drive oil chamber 132 of the continuously variable transmission 110 described above. FIG. 1 shows only a part of the control valve circuit (a line pressure regulating circuit and a discharge state switching circuit).

  The oil pump 10 is driven by an engine output, sucks oil (ATF) stored in an oil pan through a first suction oil passage 80A and a suction port 106, and boosts the pressure to two discharge ports (first discharge ports). 107A and the second discharge port 107B). As the oil pump 10, for example, a two-port vane pump having two discharge ports is preferably used. Note that a configuration having two suction ports so as to correspond to each of the two discharge ports (the first discharge port 107A and the second discharge port 107B) may be adopted. The first discharge port 107A is connected to a first line pressure oil passage 70A (corresponding to the high pressure oil passage described in the claims), and the oil discharged from the first discharge port 107A is the first line pressure oil passage. It is pumped to the path 70A. On the other hand, a second line oil passage 70B is connected to the second discharge port 107B, and the oil discharged from the second discharge port 107B is pressure-fed to the second line oil passage 70B. The second line pressure oil passage 70B is configured to communicate with the first line pressure oil passage 70A via the switching control valve 60 (details will be described later).

  A line pressure control valve 30 for adjusting the oil pressure (discharge pressure) of oil discharged from the oil pump 10 to the oil pressure (line pressure) required for the continuously variable transmission 110 is provided in the first line pressure oil passage 70A. Is provided.

  The line pressure control valve 30 is connected to a first control pressure oil passage 91, a first line pressure oil passage 70A, and a drain oil passage 93 for discharging oil, which communicate with a line pressure linear solenoid 20, which will be described later. The line pressure control valve 30 houses a spool 31 therein so as to be slidable in the axial direction. A spring 32 is provided at an end of the spool 31, and a pressing force (line pressure control pressure × pressure receiving area) generated by the line pressure control pressure generated by the line pressure linear solenoid 20 and a spring force of the spring 32 ( When the spool 31 is driven in the axial direction according to the balance with the biasing force), the amount of oil discharged from the first line pressure oil passage 70A to the drain oil passage 93 is adjusted, and the line pressure is regulated. Done.

  That is, when the spring force (biasing force) is greater than the pressing force due to the line pressure control pressure, the line pressure control valve 30 communicates the first line pressure oil passage 70A with the drain oil passage 93, and The line pressure is adjusted by discharging the oil in the pressure oil passage 70A through the drain oil passage 93. On the other hand, when the spring force (biasing force) of the spring 32 is smaller than the pressing force due to the line pressure control pressure, the line pressure control valve 30 cuts off the communication between the first line pressure oil passage 70A and the drain oil passage 93. Then, the discharge of oil from the first line pressure oil passage 70A is stopped.

  The line pressure linear solenoid 20 is a linear solenoid that displaces a valve in the axial direction according to a current value applied from a transmission control unit (hereinafter referred to as “TCU”) 150 based on a line pressure required for the continuously variable transmission 110. The line pressure control pressure is adjusted by adjusting the balance between the supply pressure from the first line pressure oil passage 70A and the drain according to the current applied to the linear solenoid. When the regulated line pressure control pressure is supplied to the line pressure control valve 30 through the first control pressure oil passage 91, the drive of the line pressure control valve 30 is controlled as described above. Here, as the current value applied to the line pressure linear solenoid 20 increases, the line pressure control pressure increases linearly, and accordingly, the actual line pressure also increases linearly.

  As described above, the second discharge port 107B of the oil pump 10 is connected to the first line pressure oil passage 70A via the second line pressure oil passage 70B and the switching control valve 60. The second discharge port 107B of the oil pump 10 communicates directly or indirectly with the first suction oil passage 80A via the second line pressure oil passage 70B, the switching control valve 60, and the second suction oil passage 80B. Have been.

  The switching control valve 60 discharges the oil discharged from the second discharge port 107B based on the spring force (biasing force) of the spring 62 and the pressing force of the switch hydraulic pressure generated by the switch pressure solenoid 50 described later. Between the first line pressure oil passage 70A (high pressure oil passage) and the second suction oil passage 80B (low pressure oil passage) directly or indirectly communicating with the first suction oil passage 80A (suction port 106). To switch.

More specifically, the switching control valve 60 includes a second control pressure oil passage (switch pressure oil passage) 92 communicating with the switch pressure solenoid 50, a first line pressure oil passage 70A, and a second control oil passage 70B communicating with the second discharge port 107B. It is connected to a line pressure oil passage 70B and a second suction oil passage 80B that directly or indirectly communicates with the first suction oil passage 80A (suction port 106). The switching control valve 60 houses a spool 61 therein so as to be slidable in the axial direction. A spring 62 is disposed at one end of the spool 61, and is generated by a spring force (biasing force) F _spring (= K × X (spring collapse allowance)) of the spring 62 and a switch pressure solenoid 50. When the spool 61 is driven in the axial direction according to the balance of the pressing force F _SW (switch hydraulic pressure P _SW × pressure receiving area A _SW ) by the switch hydraulic pressure P _SW , the oil communicating with the second line pressure oil passage 70B is provided. The path is switched between the first line pressure oil path 70A and the second suction oil path 80B.

  More specifically, the switching control valve 60 connects the second line pressure oil passage 70B and the first line pressure oil passage 70A when the spring force is greater than the pressing force by the switch oil pressure, that is, The destination of the oil discharged from the second discharge port 107B is switched to the first line pressure oil passage 70A. On the other hand, when the spring force is less than the pressing force by the switch oil pressure, the switching control valve 60 connects the second line pressure oil passage 70B and the second suction oil passage 80B, that is, the second discharge port 107B. Is switched so that the discharge destination of the oil discharged from the second suction oil passage 80B.

  Therefore, when the switch hydraulic pressure is supplied from a switch pressure solenoid 50 described later, the switching control valve 60 connects the second line pressure oil passage 70B and the second suction oil passage 80B, that is, the second Switching is performed such that the discharge destination of the oil discharged from the discharge port 107B is the second suction oil passage 80B (so that the oil is discharged halfway). On the other hand, for example, when the switch oil pressure is not supplied from the switch pressure solenoid 50 (when the switch oil pressure is zero), the switching control valve 60 communicates the second line pressure oil passage 70B with the first line pressure oil passage 70A. That is, switching is performed such that the discharge destination of the oil discharged from the second discharge port 107B is the first line pressure oil passage 70A (to be in the full discharge state).

  The switch pressure solenoid 50 determines the discharge destination of the oil discharged from the second discharge port 107B based on, for example, the engine torque (input torque of the continuously variable transmission 110) and the gear ratio of the continuously variable transmission 110. A switch oil pressure (switching oil pressure) for switching between the one-line pressure oil passage 70A and the second suction oil passage 80B (that is, for switching between the full discharge state and the half discharge state) is generated. The first line pressure oil passage 70A and the second control pressure oil passage (switch pressure oil passage) 92 described above are connected to the switch pressure solenoid 50. When the switch pressure solenoid 50 is opened, the supply pressure from the first line pressure oil passage 70 </ b> A passes through the second control pressure oil passage 92, and one end of the switching control valve 60 (the side facing the spring 62). This is supplied to the section as switch hydraulic pressure (switching hydraulic pressure). On the other hand, when the switch pressure solenoid 50 is closed, the supply of the switch hydraulic pressure is stopped. At this time, the oil in the second control pressure oil passage 92 is drained, and the switch oil pressure is set to zero.

  As the switch pressure solenoid 50, for example, an on / off solenoid that opens when a voltage is applied and closes when the voltage is stopped is suitably used. The relationship between the application / stop of the voltage and the opening / closing of the valve may be reversed (normally open). The opening / closing of the switch pressure solenoid 50 is controlled by the TCU 150.

  A line pressure sensor 153 for detecting a line pressure (oil pressure) is attached to the first line pressure oil passage 70A. The line pressure sensor 153 is electrically connected to the TCU 150, and an output of the line pressure sensor 153, that is, an electric signal (for example, a voltage) corresponding to the line pressure is read into the TCU 150.

  The TCU 150 includes, in addition to the line pressure sensor 153, various switches including, for example, a range switch 151 that detects a selected position of a shift lever, and an oil temperature sensor 152 that detects an oil temperature (oil temperature) of the continuously variable transmission 110. Sensor is connected. The TCU 150 also includes an engine control unit (hereinafter, referred to as “ECU”) 170 that comprehensively controls the engine 160 via a CAN (Controller Area Network) 190, a brake control by automatic pressurization, and a torque of the engine 160. It is connected to a vehicle dynamic control unit (hereinafter referred to as a “VDCU”) 180 or the like that controls sideslip by control and ensures vehicle stability during turning, and the like, and can communicate with each other.

  Here, the ECU 170 is connected to a crank angle sensor 171 for detecting the position of the crankshaft of the engine 160, an accelerator opening sensor 172 for detecting the opening of the accelerator pedal, and the like. The ECU 170 obtains the engine speed from the change in the rotational position of the crankshaft detected by the crank angle sensor 171. Further, the ECU 170 obtains the engine torque from the intake air amount and the like detected by the air flow meter, for example. The ECU 170 transmits information such as the engine speed, the engine torque, the accelerator pedal opening, the coolant temperature, and the like to the TCU 150 and the like via the CAN 190.

  On the other hand, the VDCU 180 is connected to a vehicle speed sensor 181 that detects the rotation speed (vehicle speed) of each wheel of the vehicle. The VDCU 180 transmits information such as the detected wheel speed (vehicle speed) to the TCU 150 via the CAN 190.

  The TCU 150 receives information such as the engine speed, the engine torque, and the accelerator opening from the ECU 170 via the CAN 190, and also receives the information such as the vehicle speed from the VDCU 180. The vehicle speed information may be calculated from the rotation speed of the secondary shaft 130 and the total gear ratio between the secondary shaft 130 and the wheels. Further, the vehicle speed sensor may be connected to the TCU 150 to directly detect the vehicle speed.

  The TCU 150 includes a microprocessor for performing calculations, an EEPROM for storing programs for causing the microprocessor to execute various processes, a RAM for storing various data such as calculation results, a backup RAM for storing the stored contents by a battery, And an input / output I / F.

  The TCU 150 automatically changes the gear ratio steplessly according to the driving state of the vehicle (for example, accelerator pedal opening and vehicle speed, etc.) based on the various information acquired from the various sensors described above. The shift map is stored in an EEPROM or the like in the TCU 150. Further, the TCU 150 controls the driving of the line pressure linear solenoid 20, the switch pressure solenoid 50, and the like. That is, the TCU 150 adjusts the line pressure and switches the discharge state of the oil pump 10 (full discharge state and half discharge state).

  In particular, the TCU 150 determines whether or not the oil pump 10 is fixed in the full discharge state or the half discharge state (that is, the switch pressure solenoid 50 for switching the discharge state and / or the switching control valve 60 is fixed). Has a function of preventing overshoot of the hydraulic pressure immediately after the termination (or interruption) of the hydraulic pressure. Therefore, the TCU 150 functionally includes a discharge state switching unit 150a, a target oil pressure setting unit 150b, a pressure adjusting unit 150c, a sticking determination unit 150d, a sticking determination prohibition unit 150e, and a storage unit 150f. In the TCU 150, a program stored in an EEPROM or the like is executed by a microprocessor, so that a discharge state switching unit 150a, a target oil pressure setting unit 150b, a pressure adjusting unit 150c, a sticking determination unit 150d, and a sticking determination prohibiting unit 150e. Functions are realized.

  The discharge state switching unit 150a drives the switch pressure solenoid 50 to change the discharge state of the oil pump 10 so that the two discharge ports (the first discharge port 107A and the second discharge port 107B) are the first line pressure oil passage 70A ( High pressure oil passage), or the first discharge port 107A of the two discharge ports (the first discharge port 107A and the second discharge port 107B) is connected to the first line pressure oil path 70A, The second discharge port 107B is switched to a half discharge state in which the second discharge port 107B is directly or indirectly communicated with the suction port 106 (first suction oil passage 80A) of the oil pump 10. That is, the discharge state switching unit 150a, the switch pressure solenoid 50, and the switching control valve 60 function as a discharge state switching unit described in the claims.

  More specifically, the discharge state switching unit 150a switches the discharge state of the oil pump 10 between the full discharge state and the half discharge state based on, for example, the engine torque and the gear ratio of the continuously variable transmission 110.

  In particular, the discharge state switching unit 150a keeps the sticking state until a predetermined time (for example, 0.5 (sec)) elapses after the end of the sticking determination (including after the interruption by the sticking determination prohibiting unit 150e described later). The discharge state of the oil pump 10 is switched using the engine torque and the gear ratio at the time when the determination is started as the respective upper limit values. Here, the engine torque and the gear ratio of the continuously variable transmission 110 at the time of starting the sticking determination are stored in, for example, the storage unit 150f including the above-described RAM and the like. That is, the storage unit 150f functions as a start state storage unit described in the claims.

  Also, after the end of the sticking determination, the discharge state switching unit 150a changes the engine torque and the gear ratio used for switching the discharge state by a predetermined change amount (for example, 500 (for the engine torque, 500 ( N / m / sec) and the gear ratio is 2 (/ sec)), and the actual (real-time) engine torque and gear ratio are approximated from the engine torque and gear ratio stored in the storage unit 150f.

  The target oil pressure (target line pressure) setting unit 150b sets a target oil pressure that is a control target value of the oil pressure (line pressure) of the first line pressure oil passage 70A. The target oil pressure setting unit 150b replaces the target oil pressure with the oil pump when the sticking determination (diagnosis) for determining whether the oil pump 10 is stuck in the full discharge state or the half discharge state is performed. A diagnosis target hydraulic pressure for determining whether or not 10 is fixed in a full discharge state or a half discharge state is set. At this time, the target hydraulic pressure setting unit 150b sets a value (half discharge maximum pressure + predetermined value) higher than the maximum pressure in the half discharge state as the target pressure for diagnosis. It is preferable that the predetermined value is a value that does not make an erroneous determination in consideration of various variations. That is, the target oil pressure setting unit 150b functions as a target oil pressure setting unit described in the claims.

  More specifically, the target hydraulic pressure for diagnosis is preferably set to a value higher than the maximum pressure in the half discharge state and lower than the maximum pressure in the full discharge state. Here, each of the maximum pressure in the half discharge state and the maximum pressure in the full discharge state is, for example, a map (half discharge maximum pressure map, The maximum discharge pressure map is stored in advance, and the map can be obtained by searching for the engine speed and the oil temperature. Note that the higher the engine speed, the higher each maximum pressure. On the other hand, the higher the oil temperature, the lower the maximum pressure. Note that the target oil pressure setting unit 150b sets the target oil pressure (target line pressure) according to the operating state of the vehicle (eg, vehicle speed, accelerator opening, etc.) when the sticking determination (diagnosis) is not performed, that is, during normal control. I do. A map (diagnosis target oil pressure map) that defines the relationship between the engine speed, the oil temperature, and the target oil pressure for diagnosis is stored in advance, and the map is searched by using the engine speed and the oil temperature. The configuration may be such that the target hydraulic pressure is directly obtained. The target hydraulic pressure or the diagnostic target hydraulic pressure set as described above is output to the pressure adjusting unit 150c.

  The pressure adjusting unit 150c drives the line pressure linear solenoid 20 to control the actual oil pressure (actual line pressure) to be equal to the target oil pressure or the diagnosis target oil pressure. That is, the pressure adjusting unit 150c functions as a pressure adjusting unit described in the claims. More specifically, the pressure adjusting unit 150c performs feedback control based on the deviation between the target oil pressure (or the target oil pressure for diagnosis) and the oil pressure (line pressure) of the first line pressure oil passage 70A, and performs the first line pressure The oil pressure in the oil passage 70A is adjusted so as to match the target oil pressure (or the target oil pressure for diagnosis).

  Here, in this embodiment, PID control (Proportional-Integral-Differential Controller) is applied to control the current value of the line pressure linear solenoid 20. That is, the pressure adjusting unit 150c includes a proportional term (P term) proportional to the deviation between the actual oil pressure and the target oil pressure (or the target oil pressure for diagnosis), an integral term (I term) corresponding to the time integral of the residual deviation, and The current value (control value) of the line pressure linear solenoid 20 is controlled based on a differential term (D term) corresponding to the magnitude of the change in the deviation.

  Here, the integral term (I term) accumulates the residual deviation by integration and reflects it on the current value (control value) of the line pressure linear solenoid 20. Therefore, when the sticking is determined, the diagnosis target hydraulic pressure can be output in a half discharge state. If the hydraulic pressure is set to no value, the deviation will be accumulated unnecessarily. Therefore, in particular, when the control to change the discharge state of the oil pump 10 to the half discharge state is performed at the time of the sticking determination, the pressure adjusting unit 150c performs the time integration of the deviation between the diagnosis target hydraulic pressure and the actual hydraulic pressure. The accumulation operation of the integral term (I term) for adjusting the control value is temporarily stopped.

  Further, when restarting the temporarily stopped integral term accumulation operation (hydraulic pressure feedback control (PID control)), pressure adjusting section 150c uses the integral term value at the time of stopping the accumulation operation. Then, the accumulation operation of the integral term (feedback control of oil pressure (PID control)) is restarted. Here, the value of the integral term when the accumulation operation of the integral term is stopped is stored by the storage unit 150f. That is, the storage unit 150f also functions as a control value storage unit described in the claims.

  The fixation determination unit 150d determines whether the oil pump 10 is fixed in the full discharge state or the half discharge state. That is, the fixation determination unit 150d functions as a fixation determination unit described in the claims. Here, a method of detecting sticking in the full discharge state or the half discharge state will be described in detail with reference to FIG. FIG. 3 is a diagram for explaining a method of detecting sticking by the sticking detection device 1 of the oil pump. The target hydraulic pressure for diagnosis (target line pressure for diagnosis), the maximum pressure at half discharge, and An example of a change in actual oil pressure (actual line pressure) is shown. FIG. 3 also shows a normal target oil pressure (normal target line pressure). The horizontal axis in FIG. 3 is time (sec), and the vertical axis is oil pressure (MPa). In FIG. 3, the actual line pressure (actual oil pressure) is indicated by a solid line, the target line pressure for diagnosis is indicated by a broken line, the maximum pressure in a half-discharge state is indicated by a dotted line, and the target line pressure in a normal state is indicated by a chain line.

  When the diagnosis of the full discharge fixation or the half discharge fixation of the oil pump 10 is performed, first, the discharge state switching unit 150a drives the switch pressure solenoid 50 to change the discharge state of the oil pump 10 to the full discharge state. Control is performed (see t1 in FIG. 3). At this time, the engine torque and the gear ratio of the continuously variable transmission 110 at the time when the determination of the sticking is started are stored in the storage unit 150f.

  The target oil pressure setting unit 150b sets a value higher than the maximum pressure in the half-discharge state as the target oil pressure for diagnosis. At this time, the target oil pressure setting unit 150b gradually raises the diagnostic target oil pressure with a constant slope to a value exceeding the maximum pressure in the half-discharge state so that the actual oil pressure can follow (t1 in FIG. 3). To t2). Here, the above-mentioned constant inclination is set in accordance with, for example, the oil temperature and the engine speed in consideration of the followability of the actual oil pressure. Then, after increasing the diagnostic target hydraulic pressure to a value exceeding the maximum pressure in the half-discharge state, the target hydraulic pressure setting unit 150b holds (fixes) the diagnostic target hydraulic pressure at that value (t2 to t4 in FIG. 3). reference). The maximum pressure in the half-discharge state can be obtained based on the engine speed and the oil temperature, as described above.

  The pressure adjusting unit 150c drives the line pressure linear solenoid 20 to control the actual oil pressure to match the target oil pressure for diagnosis.

  The fixation determination unit 150d determines (diagnoses) whether or not the fixation is performed in the half-discharge state when a predetermined time has elapsed after the diagnostic target hydraulic pressure has been increased to a value exceeding the maximum pressure in the half-discharge state. Start. More specifically, when the actual oil pressure rises beyond the maximum pressure in the half-discharge state (for example, when the actual oil pressure substantially coincides with the target oil pressure for diagnosis), the sticking determination unit 150d determines that there is no sticking in the half-discharge state. (See t2 to t3 in FIG. 3). On the other hand, if the actual oil pressure does not increase beyond the maximum pressure in the half-discharge state, it is determined that the oil pressure is stuck in the half-discharge state. Note that the determination (diagnosis) of the half-discharge fixation may be omitted.

  After the half-discharge fixation diagnosis is completed (when it is determined that there is no half-discharge fixation), the discharge state switching unit 150a drives the switch pressure solenoid 50 to change the discharge state of the oil pump 10 from the full discharge state to the half discharge state. Control for switching to the state is performed (see t3 in FIG. 3). At that time, the pressure adjusting unit 150c stops the accumulation operation of the integral term (I term) of the hydraulic pressure feedback. Further, the value of the integral term at that time (when the accumulation operation is stopped) is stored in the storage unit 150f.

  After the control for switching from the full discharge state to the half discharge state is performed, the fixation determination unit 150d determines whether there is a pressure drop of a predetermined pressure or more and / or the actual oil pressure is the predetermined pressure (the maximum pressure in the half discharge state). It is determined whether all the ejection states are fixed based on whether or not the temperature has decreased below. That is, after the control for switching from the full discharge state to the half discharge state is performed, if the actual oil pressure drops by a predetermined value or more within a predetermined time after the control for switching from the full discharge state to the half discharge state, it is determined that the actual discharge state is not fixed in the full discharge state. . On the other hand, when the actual oil pressure does not decrease by the predetermined value or more, it is determined that the oil pressure is fixed in all discharge states (see t3 to t4 in FIG. 3). At this time, the predetermined time is set in accordance with, for example, the oil temperature and the engine speed in consideration of the followability of the hydraulic pressure when switching to the half discharge state in a normal state. Further, the predetermined value is determined based on the engine speed and the oil temperature, for example, or in consideration of the difference between the diagnostic target hydraulic pressure and the half-discharge maximum pressure, or between the diagnostic target hydraulic pressure and the half-discharge maximum pressure. Set according to the difference. Further, after the control for switching from the full discharge state to the half discharge state is performed, if the actual oil pressure drops below the maximum pressure of the half discharge state for a certain period of time after the control for switching from the full discharge state to the half discharge state, the fixation determination unit 150d does not stick in the full discharge state. Is determined. On the other hand, if the actual oil pressure does not drop below the maximum pressure in the half-discharge state, it is determined that the oil pressure is fixed in the full discharge state (see t3 to t4 in FIG. 3). Here, it is preferable that the certain time is set to be short as long as the certainty of the determination of the sticking is not reduced. After the fixation determination (diagnosis) is completed, the target hydraulic pressure for diagnosis is returned to the normal target hydraulic pressure (target line pressure) (see t4 in FIG. 3). Further, the pressure adjusting unit 150c restarts the temporarily stopped integration term accumulation operation (oil pressure feedback control (PID control)). At that time, the pressure adjusting unit 150c restarts the accumulation operation of the integral term using the value of the integral term stored in the storage unit 150f (that is, the value when the accumulation operation is stopped).

  On the other hand, the ejection state switching unit 150a stores the information until the predetermined time (for example, 0.5 (sec)) elapses after the end of the sticking determination (including after the interruption by the sticking determination prohibiting unit 150e described later). The discharge state of the oil pump 10 is switched using the engine torque and the gear ratio stored in the section 150f as upper limits. After the end of the fixation determination, the discharge state switching unit 150a stores the engine torque and the gear ratio used for switching the discharge state in a predetermined change amount in the storage unit 150f after the predetermined time has elapsed. The actual (real-time) engine torque and transmission ratio are approximated from the existing engine torque and transmission ratio.

Returning to FIG. 1, when at least one of the following interruption conditions (1) to (12) is satisfied, the sticking determination prohibition unit 150 e sets the target oil pressure setting unit 150 b, The execution of the sticking diagnosis by the pressure adjusting unit 150c, the discharge state switching unit 150a, and the sticking determination unit 150d is prohibited or interrupted. In other words, it is determined whether or not the oil pump 10 is stuck, and the execution of a series of sequences for detecting the stuck oil pump 10 is prohibited or interrupted. That is, the fixation determination prohibition unit 150e functions as a fixation determination prohibition unit described in the claims.
(1) When the rotation speed of the engine is equal to or higher than a predetermined rotation speed (for example, 2000 rpm) (that is, the pressure (oil pressure) of the oil discharged from the oil pump 10 increases and the flow rate of the discharged oil increases, If the sound might be louder).
(2) When the temperature of the oil is equal to or lower than a predetermined temperature (for example, 100 ° C.) (that is, the amount of oil leakage decreases, the pressure (oil pressure) of the oil discharged from the oil pump 10 increases, and abnormal noise increases). If there is a possibility that this will happen).
(3) When the speed of the vehicle is equal to or lower than a predetermined speed (for example, 60 km / h) (that is, when the wind noise, road noise, and the like are reduced, and the abnormal noise caused by the oil pump 10 may be relatively increased). ).
(4) The deviation between the average value of the vehicle speed in the predetermined period and the maximum value and the minimum value of the vehicle speed in the predetermined period (for example, 5 to 10 seconds) is equal to or more than a predetermined speed (for example, ± 2 (km / h)). Case (for example, when the vehicle is not running at a constant speed at a stable speed following the flow of the vehicle group).
(5) When the change rate of the accelerator opening is equal to or more than a predetermined value (that is, for example, 10 (deg / s)) (the possibility that the accelerator pedal is depressed is high, and it is estimated that the target hydraulic pressure (required hydraulic pressure) is stable) If not possible (ie, if the hydraulic pressure is likely to drop).
(6) When the deviation between the maximum pressure in the half discharge state and the target hydraulic pressure for normal control set according to the operation state is less than a predetermined pressure (for example, 0.5 (MPa)) (that is, the maximum half discharge state). When the difference between the pressure and the target oil pressure is reduced and the half-discharge state is switched during the sticking diagnosis, the actual oil pressure is likely to drop and fall below the target oil pressure (required oil pressure). When the drop is likely to occur)).
(7) When the amount of change of the gear ratio is equal to or more than a predetermined value (for example, 0.5) when it is assumed that the accelerator opening has changed by a predetermined opening (for example, 3 (deg)) (that is, a decrease in hydraulic pressure) Is likely to occur).
(8) The difference between the accelerator opening and the accelerator opening for kickdown determination for determining whether to perform kickdown for changing the gear ratio to the low side is a predetermined opening (for example, 5 (deg)). ) (I.e., a driving state in which kickdown is likely to be performed).
(9) When the deviation between the target hydraulic pressure and the actual hydraulic pressure of the high-pressure oil path is equal to or more than a predetermined value (for example, 0.2 (MPa)), and the state in which the deviation is less than the predetermined value is the first predetermined time. (For example, when it is not possible to follow the target oil pressure due to the occurrence of oil vibration).
(10) When the control for changing the discharge state of the oil pump 10 to the half discharge state is not continued for a second predetermined time (for example, 5 (sec)) or more (for example, when the half discharge state is set, the flow rate of the oil is insufficient). (I.e., a state in which the required flow rate (oil pressure) cannot be secured unless the entire discharge state is achieved).
(11) When the deviation between the maximum pressure in the half-discharge state and the target hydraulic pressure for diagnosis is less than a predetermined pressure (for example, 0.5 (MPa)) (the deviation between the maximum pressure for half-discharge and the target hydraulic pressure for diagnosis becomes small, (When the determination certainty of the fixation diagnosis is reduced.)
(12) The opening of the upshift valve that adjusts the hydraulic pressure supplied to the driving oil chamber 122 of the primary pulley 121 that forms the continuously variable transmission 110 via the first line pressure oil passage 70A is equal to or more than a predetermined opening (that is, When the duty ratio of the upshift solenoid is a predetermined value (for example, 70 (%) or more).

  When the execution of the sticking determination is interrupted by the sticking determination prohibition unit 150e, the discharge state switching unit 150a, the target oil pressure setting unit 150b, the pressure adjusting unit 150c, and the sticking determining unit 150d interrupt the execution of the sticking determination. To return to normal control.

  Next, the operation of the oil pump sticking detection device 1 (sticking detecting method) will be described with reference to FIGS. 5 and 6. FIGS. 5 and 6 are flowcharts showing the processing procedure of the sticking detection processing by the sticking detection device 1 of the oil pump. This processing is repeatedly executed mainly at every predetermined time (for example, every 10 ms) in the TCU 150.

  In step S100, the engine torque and the gear ratio of the continuously variable transmission 110 at the time when the determination of the sticking is started are stored. Next, in step S102, control is performed to drive the switch pressure solenoid 50 to set the discharge state of the oil pump 10 to the full discharge state (see t1 in FIG. 3).

  Subsequently, in step S104, a value (half discharge maximum pressure + predetermined value) higher than the maximum pressure in the half discharge state is set as the target pressure for diagnosis. At this time, the target pressure for diagnosis is gradually increased to a value exceeding the maximum pressure in the half-discharge state with a certain inclination so that the actual oil pressure can follow. In addition, the pressure is adjusted so that the actual oil pressure matches the diagnosis target oil pressure (see t1 to t2 in FIG. 3).

  In step S106, it is determined whether or not the diagnostic target hydraulic pressure has increased (reached) to a value exceeding the maximum pressure in the half-discharge state (half-discharge maximum pressure + predetermined value). If the target hydraulic pressure for diagnosis has not risen to a value exceeding the maximum pressure in the half-discharge state, the process proceeds to step S104, and the target hydraulic pressure for diagnosis reaches a value exceeding the maximum pressure in the half-discharge state. Until it rises, the processes of steps S104 to S106 described above are repeatedly executed. On the other hand, when the diagnosis target hydraulic pressure has increased to a value exceeding the maximum pressure in the half-discharge state, the process proceeds to step S108.

  When the target hydraulic pressure for diagnosis has been increased to a value exceeding the maximum pressure in the half-discharge state, in step S108, the target hydraulic pressure for diagnosis is held (fixed) at that value (see t2 to t4 in FIG. 3). Then, when a predetermined time elapses after the target hydraulic pressure for diagnosis is increased to a value exceeding the maximum pressure in the half-discharge state, in step S110, it is determined (diagnosed) whether or not the fuel is stuck in the half-discharge state. Be started.

  In the following step S112, after the diagnosis is started, it is determined whether or not the actual oil pressure has exceeded the maximum pressure in the half-discharge state for a certain period of time. Here, if the actual oil pressure exceeds the maximum pressure in the half-discharge state for a certain period of time, the process proceeds to step S114. On the other hand, if the actual oil pressure has not exceeded the maximum pressure in the half-discharge state for a certain period of time, the process proceeds to step S140.

  When the actual oil pressure exceeds the maximum pressure in the half-discharge state (for example, when the actual oil pressure substantially coincides with the target pressure for diagnosis), it is determined in step S114 that the fuel is not stuck in the half-discharge state (see t2 to t3 in FIG. 3). ).

  After the half-discharge fixation diagnosis is completed (when it is determined that there is no half-discharge fixation), in step S116, the control is performed such that the switch pressure solenoid 50 is driven to switch the discharge state of the oil pump 10 to the half-discharge state. (See t3 in FIG. 3). Further, in S118, the accumulation operation of the integral term (I term) for adjusting the control value according to the time integration of the deviation between the diagnosis target hydraulic pressure and the actual hydraulic pressure is stopped. At this time, the value of the integral term when the accumulation operation is stopped is stored in the storage unit 150f.

  Next, in step S120, a determination is made as to whether a predetermined interruption condition has been satisfied. Since the predetermined interruption condition is as described above, a detailed description is omitted here. Here, when the predetermined interruption condition is satisfied, the process proceeds to step S130. On the other hand, when the predetermined interruption condition is not satisfied, the process proceeds to step S122.

  Then, in step S122, after the control for switching from the full discharge state to the half discharge state is performed, it is determined whether or not the actual oil pressure has decreased by a predetermined value or more within a predetermined time (that is, whether a pressure drop equal to or more than the predetermined pressure has occurred). Is determined. Here, if the actual oil pressure has decreased (pressure drop) by a predetermined value or more within a predetermined time, the process proceeds to step S124. On the other hand, if the actual oil pressure does not decrease (pressure drop) by the predetermined value or more within the predetermined time, it is determined in step S128 that the fuel is stuck in all discharge states (abnormality determination), and the process proceeds to step S130. Transition.

  In step S124, a determination is made as to whether or not the actual oil pressure has dropped below a predetermined pressure (half-discharge maximum pressure) for a certain period of time. Here, when the actual oil pressure falls below the predetermined pressure (half-discharge maximum pressure) for a certain period of time, in step S126, it is determined that there is no sticking in all discharge states (normal determination), and then, in step S130 Processing shifts. On the other hand, if the actual oil pressure does not drop below the predetermined pressure (half-discharge maximum pressure) for a certain period of time, it is determined in step S128 that it is stuck in all discharge states (abnormality determination), and then the process proceeds to step S130. (See t3 to t4 in FIG. 3).

  In step S130, the sticking diagnosis is ended, and the target oil pressure is returned from the diagnosis target oil pressure to the normal target oil pressure (target line pressure) (see t4 in FIG. 3). Then, in step S132, the accumulation operation of the integration term that has been stopped is restarted. At this time, the accumulation operation of the integral term is restarted using the value of the integral term stored in the storage unit 150f (that is, the value when the accumulation operation is stopped).

  Subsequently, in step S134, after the end of the fixation diagnosis (including after the interruption), it is determined whether or not a predetermined time has elapsed. Here, if the predetermined time has not elapsed, in step S136, until the predetermined time has elapsed, the engine torque and the gear ratio stored in the storage unit 150f (that is, the time at which the sticking determination is started) The switching of the discharge state of the oil pump 10 is performed using the engine torque and the gear ratio as the upper limit values. On the other hand, when the predetermined time has elapsed, the process proceeds to step S138.

  In step S138, the engine torque and gear ratio used for switching the discharge state are changed by a predetermined amount from the engine torque and gear ratio stored in the storage unit 150f to the actual (real-time) engine torque and gear ratio. Get closer. Thereafter, the process once exits.

  If the above-described step S112 is denied, in step S140, a determination is made as to whether or not the actual oil pressure is equal to or less than the maximum pressure in the half-discharge state for a certain period of time. Here, if the actual oil pressure is equal to or less than the maximum pressure in the half-discharge state for a certain period of time, it is determined in step S142 that the oil is stuck in the half-discharge state (abnormality determination), and then the process proceeds to step S146. Transition. On the other hand, when the actual oil pressure is not less than or equal to the maximum pressure in the half-discharge state for a certain period of time, it is estimated that the oil pressure is hunting, and in step S144, the sticking diagnosis (determination) is interrupted. I do.

  In step S146, the sticking diagnosis is ended, and the target hydraulic pressure is returned from the diagnostic target hydraulic pressure to the normal target hydraulic pressure (target line pressure). Thereafter, the process proceeds to step S134 described above, and the processes of steps S134 to S138 are performed. Here, since the processing contents of steps S134 to S138 are as described above, detailed description is omitted here.

  As described above in detail, according to the present embodiment, as shown in FIG. 4, the discharge state of the oil pump 10 is controlled to the half discharge state, and a value higher than the maximum pressure in the half discharge state. When the diagnosis target hydraulic pressure is set in (1), the accumulation (feedback) of the integral term for adjusting the control value according to the time integration of the deviation between the diagnosis target hydraulic pressure and the hydraulic pressure is temporarily stopped. That is, when the target oil pressure for diagnosis and the actual oil pressure are intentionally deviated from each other, accumulation of unnecessary integral terms (I terms) is stopped. For this reason, for example, even when the accelerator pedal is depressed substantially at substantially the same time as the termination of the sticking determination, it is possible to prevent the hydraulic control circuit from being in an unnecessarily high pressure control state in all discharges. As a result, it is possible to prevent the hydraulic pressure from overshooting immediately after the completion of the sticking determination (or suspension). Here, FIG. 4 is a diagram for explaining the effect of reducing the hydraulic overshoot at the end of the sticking determination by the sticking detection device 1 of the oil pump. In FIG. 4, in order from the top, changes in the hydraulic pressure (MPa), the accelerator opening (deg), the value of the integral term (I term) of the feedback control, the current value (A) of the line pressure linear solenoid 20, and the like are shown. An example is shown.

  Further, according to the present embodiment, the value of the integral term when the accumulation operation is stopped is stored, and when the accumulation operation of the stopped integration term is restarted, the value of the stored integral term is changed. Then, the accumulation operation of the integral term is restarted. Therefore, when the accumulation operation of the integration term that has been temporarily stopped is restarted, it is possible to continuously restart from the control state when the accumulation operation of the integration term was stopped.

  On the other hand, according to the present embodiment, the engine torque and the gear ratio at the time when the determination of the sticking is started are stored, and after the determination of the sticking is completed, until the predetermined time elapses, the stored engine torque and the gear ratio are stored. The discharge state of the oil pump 10 is switched based on the engine torque and the gear ratio, with the ratios as the respective upper limit values. Therefore, for example, even when the accelerator pedal is depressed substantially simultaneously with the termination of the sticking determination (that is, when the engine torque increases), the oil pump 10 remains in the full discharge state until the predetermined time elapses. Is prevented from being switched. Therefore, the hydraulic control circuit is prevented from entering the high-pressure control state in all discharges. As a result, it is possible to prevent the hydraulic pressure from overshooting immediately after the completion of the sticking determination (or suspension).

  Further, according to the present embodiment, after a predetermined time elapses after the end of the sticking determination, the engine torque and the gear ratio used for switching the discharge state are changed by a predetermined amount and stored in the stored engine torque and gear ratio. From the ratio (that is, the engine torque and the gear ratio at the time of starting the sticking determination), the actual engine torque and the gear ratio can be approximated. Therefore, it is possible to gradually approach the actual (real-time) engine torque and gear ratio from the engine torque and gear ratio at the time of starting the sticking determination.

  Further, according to the present embodiment, when at least one of the above-described predetermined interruption conditions is satisfied, the fixation determination is interrupted. Therefore, it is possible to reduce a sense of incongruity due to abnormal noise caused by the oil pump 10 being in a half-discharge high-pressure state, to protect hardware constituting the automatic transmission, and to prevent erroneous detection of a determination of sticking. It becomes possible.

  On the other hand, according to the present embodiment, when the fixation determination is performed to determine whether the oil pump 10 is fixed in the full discharge state or the half discharge state, first, the discharge state of the oil pump 10 is changed to the full discharge state. A value higher than the maximum pressure in the half-discharge state is set as the diagnostic target hydraulic pressure for determining whether the oil pump 10 is stuck in the full discharge state or the half-discharge state. Then, the oil pressure in the first line pressure oil passage 70A (high pressure oil passage) is adjusted so as to match the target oil pressure for diagnosis. In other words, when the actual hydraulic pressure is increased so as to match the target hydraulic pressure for diagnosis, by controlling to the full discharge state, the normal discharge pressure (that is, when the half discharge is not fixed) becomes the half discharge high pressure state. Can be reduced. Then, control is performed to switch the discharge state of the oil pump 10 from the full discharge state to the half discharge state. If the oil pressure drops below the maximum pressure in the half discharge state, it is determined that the oil pump 10 is not fixed in the full discharge state. If the hydraulic pressure does not drop below the maximum pressure in the half discharge state, it is determined that the oil pressure is fixed in the full discharge state. Therefore, after the control for switching from the full discharge state to the half discharge state is performed, it is possible to determine the presence or absence of the full discharge fixation in a relatively short time. As described above, it is possible to shorten the time of the half-discharge state and the high-pressure state, that is, to shorten the time of occurrence of abnormal noise that can occur in the half-discharge high-pressure state.

  Further, according to the present embodiment, after the control of switching the discharge state of the oil pump 10 from the full discharge state to the half discharge state is performed, the hydraulic pressure is reduced by a predetermined value or more within a predetermined time, and the hydraulic pressure is reduced by half. If the pressure drops below the maximum pressure in the discharge state, it is determined that the pressure is not fixed in all discharge states, and if the oil pressure does not drop by a predetermined value or more, or the oil pressure does not drop below the maximum pressure in the half discharge state In this case, it is determined that the ink is stuck in all ejection states. That is, the determination of all the ejection sticking is performed based on the value of the oil pressure in addition to the decrease amount of the oil pressure. Therefore, it is possible to more reliably determine whether all the ejections are fixed in a relatively short time (that is, while reducing the holding time in the half ejection state). At this time, since the predetermined value is set based on the engine speed and the oil temperature, it is possible to determine the total discharge fixation with higher accuracy.

  Further, according to the present embodiment, when the adjusted hydraulic pressure exceeds the maximum pressure in the half discharge state when the discharge state of the oil pump 10 is controlled to be the full discharge state, It is determined that it is not fixed in the half-discharge state, and if the hydraulic pressure does not increase beyond the maximum pressure in the half-discharge state, it is determined that it is fixed in the half-discharge state. Therefore, in a normal state (that is, when half-ejection fixation is not performed), it is possible to reduce the time for the half-ejection state by determining the presence or absence of half-ejection fixation while maintaining the full ejection state.

  Further, according to the present embodiment, after the target hydraulic pressure for diagnosis is increased to a value exceeding the maximum pressure in the half-discharge state, the target hydraulic pressure for diagnosis is held (fixed), and the target hydraulic pressure for diagnosis becomes After a predetermined time has elapsed after the pressure has increased to a value exceeding the maximum pressure, a determination is started as to whether or not the fixing has been performed in a half-ejection state. Therefore, erroneous determination can be prevented by starting the determination in consideration of the followability (delay) of the actual hydraulic pressure.

  According to the present embodiment, the target oil pressure for diagnosis is gradually increased with a certain slope to a value exceeding the maximum pressure in the half-discharge state so that the actual oil pressure can follow when performing the sticking determination. Therefore, erroneous determination can be prevented by increasing the target hydraulic pressure for diagnosis in consideration of the followability (delay) of the actual hydraulic pressure.

  Further, according to the present embodiment, the half-discharge maximum pressure is determined based on the engine speed and the oil temperature, and the target hydraulic pressure for diagnosis is set. Become.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications are possible. For example, in the above-described embodiment, the accumulation of the integral term (I term) is temporarily stopped during the determination of the total discharge fixation, and the engine torque is maintained until a predetermined time elapses after the fixation determination (or after the interruption). Although an overshoot of the hydraulic pressure is prevented by providing an upper limit value for the gear ratio (that is, not switching to the full discharge state), only one of the methods may be executed.

  In the above embodiment, the case where the present invention is applied to the continuously variable transmission (CVT) 110 has been described as an example. However, the present invention can also be applied to a stepped automatic transmission (Step AT), DCT, and the like. it can. In the above embodiment, the present invention is applied to the chain type continuously variable transmission (CVT) 110. However, instead of the chain type continuously variable transmission, for example, a belt type continuously variable transmission or a toroidal type continuously variable transmission (CVT) may be used. The present invention can also be applied to a continuously variable transmission or the like.

  In the above embodiment, the two-port oil pump 10 having two discharge ports 107A and 107B has been described as an example. However, instead of the two-port oil pump 10, an oil pump having three or more discharge ports May be used. Further, in the above embodiment, the vane pump is used as the oil pump 10. However, instead of the vane pump, for example, an internal gear type gear pump or a trochoid pump can be used.

  The partial discharge state is not limited to the half discharge state, and may be any operation state in which the discharge amount (capacity) is smaller than that in the full discharge state.

  In the above embodiment, the on / off solenoid is used as the switch pressure solenoid 50. However, instead of the on / off solenoid, for example, a duty solenoid or a linear solenoid may be used.

  In the above embodiment, two methods (that is, a method using the oil pressure value and a method using the decrease amount (decrease width) of the oil pressure) are used in combination in order to determine the sticking in the entire discharge state. A configuration using only one of the methods may be adopted. In the above embodiment, the target hydraulic pressure for diagnosis (and the actual hydraulic pressure) is increased in the full discharge state. However, the target hydraulic pressure for diagnosis (and the actual hydraulic pressure) may be increased in the half discharge state.

  In the above embodiment, the example of the numerical value (threshold value) of each condition for interrupting the fixation diagnosis has been described. Can be set as desired. Also, it may be configured to determine whether to stop the sticking determination only in the half-discharge state.

DESCRIPTION OF SYMBOLS 1 Oil pump sticking detection device 10 Oil pump 106 Suction port 107A First discharge port 107B Second discharge port 20 Line pressure linear solenoid 30 Line pressure control valve 50 Switch pressure solenoid 60 Switching control valve 70A First line pressure oil passage 70B 2 line pressure oil passage 80A first suction oil passage 80B second suction oil passage 91 first control pressure oil passage 92 second control pressure oil passage 93 drain oil passage 110 continuously variable transmission 122 primary drive oil chamber 150 TCU
150a Discharge state switching unit 150b Target oil pressure setting unit 150c Pressure adjustment unit 150d Sticking determination unit 150e Sticking determination prohibition unit 150f Storage unit 151 Range switch 152 Oil temperature sensor 153 Line pressure sensor 160 Engine 170 ECU
171 Crank angle sensor 172 Accelerator opening sensor 180 VDCU
181 Vehicle speed sensor 190 CAN

Claims (14)

An oil pump that pressurizes oil sucked from an inlet and discharges the oil from a plurality of outlets;
The discharge state of the oil pump, the entire discharge state in which all of the plurality of discharge ports are communicated with a high-pressure oil path, or a part of the plurality of discharge ports is communicated with the high-pressure oil path, and Discharge state switching means for switching to another partial discharge state in which another part of the discharge ports communicates with the suction port of the oil pump,
Target oil pressure setting means for setting a target oil pressure that is a control target value of the oil pressure of the high-pressure oil passage,
Pressure control means for performing feedback control based on a deviation between the target oil pressure and the oil pressure of the high-pressure oil path, and adjusting the oil pressure of the high-pressure oil path to match the target oil pressure;
Based on the oil pressure adjusted by the pressure adjusting means, a fixing determination means for determining whether the oil pump is fixed in a full discharge state or a partial discharge state,
When performing a sticking determination to determine whether the oil pump is stuck,
The target hydraulic pressure setting means is configured to determine whether or not the oil pump is stuck in a full discharge state or a partial discharge state, instead of the target hydraulic pressure, as a diagnostic target hydraulic pressure based on a maximum pressure in a partial discharge state. Also set a high value,
The discharge state switching means performs control to set the discharge state of the oil pump to a partial discharge state,
The pressure adjusting means adjusts the target pressure for diagnosis and the target oil pressure when control is performed to set the discharge state of the oil pump to a partial discharge state when the pressure is adjusted so that the hydraulic pressure matches the target hydraulic pressure for diagnosis. Temporarily stop the accumulation operation of the integral term that adjusts the control value according to the time integral of the deviation from the oil pressure,
The sticking determination means determines whether or not the oil pump is stuck in the full discharge state based on a relationship between the hydraulic pressure after the control for setting the partial discharge state and the maximum pressure in the partial discharge state. A device for detecting sticking of an oil pump. A control value storage unit that stores a value of the integral term when the accumulation operation of the integral term is temporarily stopped,
The pressure regulating means may use the value of the integral term stored in the storage means to resume the accumulation operation of the integral term when resuming the temporarily stopped integral term accumulation operation. The sticking detection device for an oil pump according to claim 1, wherein: A start state storage unit that stores an engine torque and a gear ratio at the time when the sticking determination is started;
The discharge state switching unit sets the engine torque and the gear ratio stored in the start state storage unit as upper limit values until a predetermined time elapses after the end of the fixation determination, and sets the engine torque and The sticking detection device for an oil pump according to claim 1, wherein switching of a discharge state of the oil pump is performed based on a speed ratio of a continuously variable transmission. An oil pump that pressurizes oil sucked from an inlet and discharges the oil from a plurality of outlets;
The discharge state of the oil pump, the entire discharge state in which all of the plurality of discharge ports are communicated with a high-pressure oil path, or a part of the plurality of discharge ports is communicated with the high-pressure oil path, and Discharge state switching means for switching to another partial discharge state in which another part of the discharge ports communicates with the suction port of the oil pump,
Target oil pressure setting means for setting a target oil pressure that is a control target value of the oil pressure of the high-pressure oil passage,
Pressure control means for performing feedback control based on a deviation between the target oil pressure and the oil pressure of the high-pressure oil path, and adjusting the oil pressure of the high-pressure oil path to match the target oil pressure;
Based on the oil pressure adjusted by the pressure adjusting unit, a fixing determination unit that determines whether the oil pump is fixed in a full discharge state or a partial discharge state,
Start state storage means for storing an engine torque and a gear ratio when the sticking determination is started,
When performing a sticking determination to determine whether the oil pump is stuck,
The target hydraulic pressure setting means is configured to determine whether or not the oil pump is stuck in a full discharge state or a partial discharge state, instead of the target hydraulic pressure, as a diagnostic target hydraulic pressure based on a maximum pressure in a partial discharge state. Also set a high value,
The pressure adjusting means adjusts the oil pressure so as to match the target oil pressure for diagnosis,
The discharge state switching means performs control to set the discharge state of the oil pump to a partial discharge state,
The sticking determination means determines whether or not the oil pump is stuck in the full discharge state based on a relationship between the hydraulic pressure after the control for setting the partial discharge state and the maximum pressure in the partial discharge state. And
The discharge state switching unit sets the engine torque and the gear ratio stored in the start state storage unit as upper limit values until a predetermined time elapses after the end of the fixation determination, and sets the engine torque and An oil pump sticking detection device, wherein the discharge state of the oil pump is switched based on the speed ratio of the continuously variable transmission.   The discharge state switching means stores the engine torque and the gear ratio used for switching the discharge state in a predetermined change amount in the start state storage means after the predetermined time has elapsed after the end of the fixation determination. The sticking detection device for an oil pump according to claim 3 or 4, wherein the actual engine torque and the gear ratio are brought closer to the actual engine torque and the gear ratio. The apparatus further includes a sticking determination prohibiting unit that suspends execution of the sticking determination that determines whether the oil pump is stuck.
The sticking determination prohibiting means,
When the rotation speed of the engine that drives the oil pump is equal to or higher than a predetermined rotation speed,
When the temperature of the oil is below a predetermined temperature,
If the speed of the vehicle is less than the predetermined speed,
When the deviation between the average value of the vehicle speed during the predetermined period and the maximum value and the minimum value of the vehicle speed during the predetermined period is equal to or higher than the predetermined speed,
When the change speed or the change amount of the accelerator opening is a predetermined value or more,
When the deviation between the maximum pressure in the partial discharge state and the target hydraulic pressure for normal control set according to the operation state is less than a predetermined pressure,
If the amount of change in the gear ratio is equal to or greater than a predetermined value, assuming that the accelerator opening has changed by the predetermined opening,
When the deviation between the accelerator opening and the accelerator opening for kickdown determination for determining whether to perform kickdown for changing the gear ratio to the low side is less than a predetermined opening,
When the difference between the target oil pressure and the actual oil pressure of the high-pressure oil passage is equal to or more than a predetermined value, and when the state in which the difference is less than a predetermined value does not continue for a first predetermined time or more,
When the control for changing the discharge state of the oil pump to the partial discharge state is not continued for a second predetermined time or more,
If the deviation between the maximum pressure in the partial discharge state and the target pressure for diagnosis is less than a predetermined pressure,
When the opening of the valve that adjusts the oil pressure supplied to the oil chamber of the pulley constituting the continuously variable transmission through the high-pressure oil passage is equal to or more than a predetermined opening,
When at least one of the conditions is satisfied, interrupting execution of the fixation determination by the target oil pressure setting means, the pressure regulation means, the discharge state switching means, and the fixation determination means. The sticking detection device for an oil pump according to any one of claims 1 to 5, wherein:     After the control for setting the partial discharge state is performed, if the hydraulic pressure is equal to or less than the maximum pressure in the partial discharge state, the fixing determination unit determines that the hydraulic pressure is not fixed in the full discharge state, and the hydraulic pressure becomes the maximum in the partial discharge state. The sticking detection device for an oil pump according to any one of claims 1 to 6, wherein when the pressure is higher than the pressure, it is determined that the sticking is performed in all discharge states. When performing a fixation determination to determine whether the oil pump is fixed in a full discharge state or a partial discharge state,
The discharge state switching means performs control to set the discharge state of the oil pump to a full discharge state,
The target oil pressure setting means sets a value higher than the maximum pressure in the partial discharge state as the target oil pressure for diagnosis,
The pressure adjusting means adjusts the oil pressure so as to match the target oil pressure for diagnosis,
afterwards,
The discharge state switching means performs control to switch the discharge state of the oil pump from a full discharge state to a partial discharge state,
After the control for switching the discharge state of the oil pump from the full discharge state to the partial discharge state has been performed, if the oil pressure has decreased by a predetermined value or more within a predetermined time, the lock determination means has fixed in the full discharge state. 8. The oil pump sticking detection according to claim 1, wherein it is determined that there is no oil pressure, and if the oil pressure does not decrease by a predetermined value or more, it is determined that the oil pump is stuck in all discharge states. apparatus.   Within a predetermined time, after the control for switching the discharge state of the oil pump from the full discharge state to the partial discharge state is performed, the oil pressure decreases by a predetermined value or more, and the oil pressure is changed to the partial discharge state. If the pressure drops below the maximum pressure, it is determined that the pressure is not fixed in the entire discharge state.If the oil pressure does not drop below a predetermined value, or if the oil pressure does not drop below the maximum pressure in the partial discharge state, all The sticking detection device for an oil pump according to claim 8, wherein it is determined that the sticking is performed in a discharge state.   The sticking detection device for an oil pump according to claim 9, wherein the sticking determination means sets the predetermined value based on an engine speed and an oil temperature.   When the discharge state of the oil pump is controlled to be the full discharge state, and the regulated hydraulic pressure rises beyond the maximum pressure in the partial discharge state, the sticking determination unit determines the partial discharge state. And determining if the hydraulic pressure does not increase beyond the maximum pressure in the partial discharge state, and that the hydraulic pressure is fixed in the partial discharge state. Item 15. The oil pump sticking detection device according to Item 6.   9. The target oil pressure setting means, when performing the sticking determination, gradually increases the diagnostic target oil pressure to a value exceeding a maximum pressure in a partial discharge state with a constant inclination. The sticking detection device for an oil pump according to any one of claims 11 to 11. The target oil pressure setting means, after increasing the target oil pressure for diagnosis to a value exceeding the maximum pressure in the partial discharge state, holding the target oil pressure for diagnosis,
After the diagnosis target hydraulic pressure is increased to a value exceeding the maximum pressure in the partial discharge state after a predetermined time has elapsed, the fixing determination unit starts determining whether or not the diagnosis target hydraulic pressure is fixed in the partial discharge state. 13. The device for detecting sticking of an oil pump according to claim 12, wherein:   14. The diagnostic device according to claim 1, wherein the determination unit determines a maximum pressure in a partial discharge state based on an engine speed and an oil temperature, and sets the diagnosis target hydraulic pressure. 15. Item 15. The oil pump sticking detection device according to Item 6.

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