JP2019199929A - Fixation detection device of oil pump - Google Patents

Abstract

To provide a fixation detection device of an oil pump capable of protecting hardware constituting an automatic transmission even when a discharge state of the oil pump is controlled to a partial discharge state in diagnosing fixation.SOLUTION: A target hydraulic pressure determination portion 150a determines a value higher than a partial discharge maximum pressure as a target hydraulic pressure for diagnosis, a pressure regulation portion 150b regulates a pressure so that the hydraulic pressure is agreed with the target hydraulic pressure for diagnosis, a discharge state switching portion 150c executes a control so that the discharge state of an oil pump 10 becomes a partial discharge state, a fixation determination portion 150d determines whether the oil pump 10 is fixed or not in a full discharge state on the basis of a relationship between the hydraulic pressure after executing the control to have the partial discharge state and a maximum pressure of the partial discharge state, and a fixation determination prohibition portion 150e prohibits or interrupts the execution of the determination of fixation, when at least one of a first index value having correlation to stability of necessary hydraulic pressure during the fixation diagnosis and a second index value indicating a degree of margin to the necessary hydraulic pressure of the partial discharge maximum pressure, satisfies a prescribed condition.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sticking detection device for an oil pump that detects whether or not 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), etc.) includes an oil pump that is driven by engine power and discharges high-pressure oil. Each function such as gear shifting and forward / reverse switching is realized by regulating and supplying the discharged high-pressure oil.

  On the other hand, in recent years, a load (loss) reduction of an oil pump has been required due to a request for improvement in fuel consumption 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 cut off from an intake 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 the two discharge ports communicates with the suction port. It has become.

  By the way, when such an oil pump is fixed in the full discharge state, it is impossible to reduce the load (that is, improve the fuel efficiency). On the other hand, if it is fixed in a semi-discharge state, there is a possibility that the required oil flow rate cannot be supplied to the 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 between a full discharge state and a half discharge state of an oil pump.

  More specifically, the abnormality detection device includes a switching control unit that performs switching control to switch to the half-discharge state, and pressure regulation that performs pressure-control control 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 stuck abnormally 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, when the target hydraulic pressure for diagnosis is increased to a value that cannot be discharged in the half-discharge state, and the actual pressure increases to the target hydraulic pressure for diagnosis (that is, a value that cannot be output in the half-discharge state) It is determined that there is an abnormality (the oil pump is stuck in the full discharge state), and other cases are determined to be normal.

JP 2017-106581 A

  However, according to the abnormality detection device described in Patent Document 1 described above, the oil pump is controlled to a half discharge state at the time of fixing diagnosis (that is, if the oil pump is normal, the discharge pressure of the oil pump is in the half discharge state). For example, when the accelerator pedal is depressed during the sticking diagnosis and the engine torque increases and the torque input to the automatic transmission (continuously variable transmission) increases (that is, When the required oil pressure rises), the actual oil pressure falls below the required oil pressure, and for example, a chain or a clutch constituting the automatic transmission (continuously variable transmission) may slip.

  The present invention has been made to solve the above problems, and protects the hardware constituting the automatic transmission even if the discharge state of the oil pump is controlled to the partial discharge state at the time of fixing diagnosis. It is an object of the present invention to provide an oil pump sticking detection device capable of achieving the above.

  An oil pump sticking detection device according to the present invention includes an oil pump that boosts oil sucked from an inlet and discharges it from a plurality of outlets, and a discharge state of the oil pump. Either a full discharge state that is in communication, or a partial discharge state in which some of the plurality of discharge ports are connected to the high-pressure oil passage and the other discharge ports are connected to the suction port of the oil pump. The discharge state switching means for switching, the target oil pressure setting means for setting the target oil pressure for diagnosis for determining whether or not the oil pump is fixed in the full discharge state or the partial discharge state, and the oil pressure of the high-pressure oil passage for diagnosis Pressure adjusting means for adjusting the pressure to match the target oil pressure, and sticking determination means for determining whether or not the oil pump is stuck in the full discharge state or the partial discharge state based on the oil pressure adjusted by the pressure adjusting means. And sticking Based on at least one of the first index value having a correlation with the stability of the required hydraulic pressure during the disconnection and the second index value indicating the margin of the maximum pressure in the partial discharge state with respect to the required hydraulic pressure, the oil pump A sticking judgment prohibiting means for prohibiting or interrupting the sticking judgment for judging whether or not the oil pump is stuck, and setting the target hydraulic pressure when performing the sticking judgment for judging whether or not the oil pump is stuck The means sets the diagnosis target oil pressure to a value higher than the maximum pressure in the partial discharge state, the pressure adjusting means adjusts the oil pressure so that it matches the diagnosis target oil pressure, and the discharge state switching means is the oil pump. The discharge state of the oil pump is controlled to be a partial discharge state, and the sticking determination means determines whether the oil pump is fully controlled based on the relationship between the hydraulic pressure after the control to set the partial discharge state and the maximum pressure in the partial discharge state. Discharge state If the sticking determination prohibiting means satisfies at least one of the first index value and the second index value satisfies a predetermined condition, the target hydraulic pressure setting means Further, the execution of the sticking determination by the pressure adjusting means, the discharge state switching means, and the sticking judgment means is prohibited or interrupted.

  According to the oil pump sticking detection device according to the present invention, when the sticking determination for determining whether or not the oil pump is stuck is performed, that is, control is performed to set the discharge state of the oil pump to the partial discharge state. As the diagnosis target oil pressure, a value higher than the maximum pressure in the partial discharge state is set, and when the oil pressure is adjusted to match the diagnosis target oil pressure, the stability of the required oil pressure during the sticking diagnosis When at least one of the first index value having a correlation and the second index value indicating the margin of the maximum pressure in the partial discharge state with respect to the required hydraulic pressure satisfies a predetermined condition, the target hydraulic pressure setting means The execution of the sticking judgment by the pressure adjusting means, the discharge state switching means and the sticking judgment means is prohibited or interrupted. For this reason, for example, when performing sticking diagnosis, it is prohibited to perform sticking judgment when the stability of the required hydraulic pressure is estimated to be low or when the margin for the required hydraulic pressure of the maximum pressure in the partial discharge state is low. Or it can be interrupted. As a result, even if the discharge state of the oil pump is controlled to the partial discharge state at the time of the sticking diagnosis, it is possible to protect the hardware constituting the automatic transmission.

  More specifically, in the oil pump sticking detection device according to the present invention, the sticking determination prohibiting unit has a predetermined difference between the average value of the vehicle speed in the predetermined period and each of the maximum value and the minimum value of the vehicle speed in the predetermined period. When the speed is higher than the speed, it is preferable to prohibit or interrupt the execution of the sticking determination.

  By the way, for example, in a state where the vehicle is traveling stably at a constant speed according to the flow of the vehicle group, it is unlikely that the accelerator pedal is depressed, and it can be estimated that the required hydraulic pressure is relatively stable. Therefore, when it is not in such a running state, that is, when the deviation between the average value of the vehicle speed in the predetermined period and each of the maximum value and the minimum value of the vehicle speed in the predetermined period is equal to or higher than the predetermined speed, By interrupting, it is possible to protect the hardware constituting the automatic transmission.

  In the oil pump sticking detection device according to the present invention, it is preferable that the sticking determination prohibiting means prohibits or interrupts the sticking determination when the change rate or change amount of the accelerator opening is equal to or greater than a predetermined value.

  By the way, when the change speed or change amount of the accelerator opening is less than a predetermined value, it is estimated that the accelerator pedal is not likely to be depressed, or is not actually depressed, and the required hydraulic pressure is relatively stable. Therefore, when it is not in such a running state, that is, when the change speed or change amount of the accelerator opening is equal to or greater than a predetermined value, the execution of the sticking determination is prohibited or interrupted, so that the hardware constituting the automatic transmission Protection can be achieved.

  Further, in the oil pump sticking detection device according to the present invention, the sticking determination prohibiting means has a deviation between the maximum pressure in the partial discharge state and the target hydraulic pressure for normal control set according to the operating state being less than the predetermined pressure. In this case, it is preferable to prohibit or interrupt the execution of the sticking determination.

  In this case, when the deviation between the maximum pressure in the partial discharge state and the target hydraulic pressure for normal control set in accordance with the operation state is less than a predetermined pressure, execution of the sticking determination is prohibited or interrupted. For this reason, the difference between the partial discharge maximum pressure and the target hydraulic pressure (that is, the required hydraulic pressure) is reduced, and when switching to the partial discharge state when performing a sticking diagnosis, the actual hydraulic pressure decreases and the target hydraulic pressure (required hydraulic pressure) decreases. When the risk of turning is high (that is, when there is no room), execution of the sticking determination can be prohibited or interrupted. As a result, it is possible to protect the hardware constituting the automatic transmission.

  Further, in the oil pump sticking detection device according to the present invention, after the sticking determination means is controlled to be in the partial discharge state, the sticking determination unit is stuck in the full discharge state when the hydraulic pressure is equal to or lower than the maximum pressure in the partial discharge state. If it is determined that the oil pressure is higher than the maximum pressure in the partial discharge state, it is preferable to determine that the pressure is fixed in the full discharge state.

  In this way, based on the relationship between the hydraulic pressure after the partial discharge state is controlled and the maximum pressure in the partial discharge state, it is accurately determined whether or not the oil pump is fixed in the full discharge state. Can be determined.

  In the oil pump sticking detection device according to the present invention, when the sticking determination is made to determine whether the oil pump is stuck in the full discharge state or the partial discharge state, the discharge state switching means includes the discharge state of the oil pump. The target oil pressure setting means sets a value higher than the maximum pressure in the partial discharge state as the diagnostic target oil pressure, and the pressure adjustment means matches the oil pressure with the diagnostic target oil pressure. 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 oil pressure drops below a predetermined value within a predetermined time after it is broken, it is determined that it is not fixed in the full discharge state, and if the oil pressure does not drop above the predetermined value, it is fixed in the full discharge state. It is preferable that the constant.

  In this case, when the sticking determination for determining whether or not the oil pump is stuck in the full discharge state or the partial discharge state is performed, first, control is performed so that the discharge state of the oil pump is set to the full discharge state. The diagnosis target oil pressure for determining whether the oil pump is fixed in the full discharge state or the partial discharge state is set to a value higher than the maximum pressure in the partial discharge state, and the hydraulic pressure in the high pressure oil passage is diagnosed. The pressure is adjusted to match the target hydraulic pressure. That is, when the actual hydraulic pressure is increased so as to coincide with the diagnostic target hydraulic pressure, by controlling to the full discharge state, the normal discharge time (that is, when the partial discharge is not fixed) can be reduced. Can be reduced. And then, 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, it is determined that the oil pressure is not fixed in the full discharge state when the hydraulic pressure drops by a predetermined value or more, When the hydraulic pressure does not decrease by a predetermined value or more, it is determined that the oil pressure is fixed in the full discharge state. Therefore, after the control to switch from the full discharge state to the partial discharge state is performed, it is possible to determine whether or not the full discharge is fixed in a relatively short time. As described above, it is possible to shorten the time for the partial discharge state and the high pressure state, that is, the time for generating the 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 controls the oil pressure to be 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. If the oil pressure drops below the maximum pressure in the partial discharge state, it is determined that the pressure is not fixed in the full discharge state. If the oil pressure does not drop more than the predetermined value, or 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 it is firmly fixed in the entire discharge state.

  In this case, after the control to switch the discharge state of the oil pump from the full discharge state to the partial discharge state is performed, the hydraulic pressure is decreased by a predetermined value or more within a predetermined time, and the hydraulic pressure is less than the maximum pressure in the partial discharge state. If it drops, it is judged that it is not stuck in the full discharge state, and if the oil pressure does not drop more than the predetermined value, or if the oil pressure does not drop below the maximum pressure in the partial discharge state, it sticks in the full discharge state. It is determined that That is, it is determined whether or not the total discharge is fixed based on the value of the oil pressure in addition to the amount of decrease in the oil pressure. Therefore, it is possible to more reliably determine whether or not all discharges are fixed in a relatively short time (that is, while shortening the holding time in the partial discharge state).

  In the oil pump sticking detection device according to the present invention, the sticking determination means preferably sets the predetermined value based on the engine speed and the oil temperature.

  Incidentally, the discharge pressure of the oil pump varies depending on the rotational speed of the engine that drives the oil pump and the oil temperature. In this case, since the predetermined value is set on the basis of the engine speed and the oil temperature, it is possible to determine the full discharge fixation more accurately.

  Further, in the oil pump sticking detection device according to the present invention, when the sticking determination means is controlled so that the discharge state of the oil pump becomes the full discharge state, the regulated hydraulic pressure is in the partial discharge state. When the pressure exceeds the maximum pressure, it is determined that it is not stuck in the partial discharge state, and when the hydraulic pressure does not rise above the maximum pressure in the partial discharge state, it can be determined that it is stuck in the partial discharge state. preferable.

  In this case, when the discharge state of the oil pump is controlled to be the full discharge state, if the regulated hydraulic pressure rises above the maximum pressure in the partial discharge state, the oil pump is stuck in the partial discharge state. If the hydraulic pressure does not increase beyond the maximum pressure in the partial discharge state, it is determined that the oil is stuck in the partial discharge state. For this reason, when normal (that is, when partial discharge fixation is not performed), it is possible to reduce the time for partial discharge state by determining the presence or absence of partial discharge fixation while maintaining the full discharge state.

  In the oil pump sticking detection device according to the present invention, when the sticking determination is performed, the target oil pressure setting means gradually increases the diagnostic target oil pressure to a value exceeding a maximum pressure in the partial discharge state with a certain inclination. It is preferable to raise it.

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

  In the oil pump sticking detection device according to the present invention, the target hydraulic pressure setting means raises the diagnostic target hydraulic pressure to a value exceeding the maximum pressure in the partial discharge state, and then holds the diagnostic target hydraulic pressure to determine sticking. Preferably, when the predetermined target time has elapsed after the diagnostic target hydraulic pressure has risen to a value exceeding the maximum pressure in the partial discharge state, the means starts to determine whether or not it is stuck in the partial discharge state.

  In this case, after the diagnostic target hydraulic pressure is increased to a value exceeding the maximum pressure in the partial discharge state, the diagnostic target hydraulic pressure is held (fixed), and the diagnostic target hydraulic pressure exceeds the maximum pressure in the partial discharge state. When the predetermined time has elapsed after rising to the value, the determination of whether or not it is stuck in the partial discharge state is started. Therefore, erroneous determination can be prevented by starting determination in consideration of the follow-up performance (delay) of the hydraulic pressure.

  Further, in the oil pump sticking detection device according to the present invention, the sticking determination means obtains the maximum pressure in the partial discharge state based on the engine speed and the oil temperature, and sets the diagnostic target hydraulic pressure. Is preferred.

  As described above, the discharge pressure of the oil pump varies depending on the engine speed and the oil temperature. In this case, since the maximum pressure in the partial discharge state is obtained based on the engine speed and the oil temperature, and the diagnostic target hydraulic pressure is set, 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 or not an oil pump that can be switched between a full discharge state and a partial discharge state is stuck, the discharge state of the oil pump is a partial discharge state at the time of sticking diagnosis. Even if controlled, the hardware constituting the automatic transmission can be protected.

It is a figure which shows the structure of the sticking detection apparatus of the oil pump which concerns on embodiment. It is a figure which shows the structure of the continuously variable transmission to which the sticking detection apparatus of the oil pump which concerns on embodiment is applied. It is a figure for demonstrating the sticking detection method (when sticking diagnosis is not interrupted) by the sticking detection apparatus of the oil pump which concerns on embodiment. It is a figure for demonstrating the sticking detection method (when sticking diagnosis is interrupted) by the sticking detection apparatus of the oil pump which concerns on embodiment. It is a flowchart which shows the process sequence of the sticking detection process by the sticking detection apparatus of the oil pump which concerns on embodiment (1st page). It is a flowchart which shows the process sequence of the sticking detection process by the sticking detection apparatus of the oil pump which concerns on embodiment (2nd page).

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same reference numerals are used for the same or corresponding parts. Moreover, in each figure, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | 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 together. The oil pump sticking detection device 1 detects sticking of the oil pump 10 in a full discharge state or a half discharge state (corresponding to a partial discharge state described in 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 an oil pump sticking detection device 1. FIG. 2 is a diagram illustrating 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 the crankshaft of the engine 160 via, for example, a torque converter (not shown), and converts the driving force from the engine 160 and outputs it. 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 disposed in parallel with the primary shaft 120.

  A primary pulley 121 is provided on the primary shaft 120. The primary pulley 121 includes a fixed pulley 121a joined to the primary shaft 120, and a movable pulley (sheave) that faces the fixed pulley 121a and is slidable in the axial direction of the primary shaft 120 and is not relatively rotatable. 121b, and is configured to be able to change the cone surface interval between the pulleys 121a and 121b, that is, the pulley groove width. On the other hand, a secondary pulley 131 is provided on the secondary shaft 130. The secondary pulley 131 is a fixed pulley 131a joined to the secondary shaft 130, and a movable pulley (sheave) that faces the fixed pulley 131a and is slidable in the axial direction of the secondary shaft 130 and is not relatively rotatable. 131b, and the pulley groove width can be changed.

  Between the primary pulley 121 and the secondary pulley 131, a chain 140 that transmits a driving force is suspended. By changing the groove widths of the primary pulley 121 and the secondary pulley 131 and changing the ratio of the winding diameter of the chain 140 to the pulleys 121 and 131 (pulley ratio), the gear ratio is changed steplessly. If the winding diameter of the chain 140 around the primary pulley 121 is Rp and the winding diameter of the secondary pulley 131 is Rs, the gear ratio i is expressed by i = Rs / Rp. Further, 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 drive oil chamber 122 and the secondary hydraulic pressure introduced into the secondary drive oil chamber 132.

  The hydraulic pressure for shifting the continuously variable transmission 110, that is, the primary hydraulic pressure and the secondary hydraulic pressure described above are controlled by a control valve (valve body). The control valve uses a plurality of spool valves and a solenoid valve (solenoid valve) that moves the spool valve to open and close an oil passage formed therein, so that the hydraulic pressure discharged from the oil pump 10 (hereinafter referred to as “line pressure”). Is also 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 (line pressure regulating circuit and discharge state switching circuit).

  The oil pump 10 is driven by engine output, sucks oil (ATF) stored in an oil pan through the first suction oil passage 80A and the suction port 106, and boosts the pressure to two discharge ports (first discharge port). 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. In addition, it is good also as a structure which has two inlets so that it may respond | correspond to each of two outlets (1st outlet 107A and 2nd outlet 107B). The first discharge port 107A is connected to a first line pressure oil passage 70A (corresponding to the high pressure oil passage described in claims), and the oil discharged from the first discharge port 107A is the first line pressure oil. It is pumped to the path 70A. On the other hand, the second line oil passage 70B is connected to the second discharge port 107B, and the oil discharged from the second discharge port 107B is pumped 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).

  In the first line pressure oil passage 70A, 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. 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 described later. The line pressure control valve 30 accommodates a spool 31 therein so as to be slidable in the axial direction. A spring 32 is disposed at the end of the spool 31, and the 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 the spring force of the spring 32 ( The spool 31 is driven in the axial direction according to the balance with the urging force), whereby 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, the line pressure control valve 30 communicates the first line pressure oil passage 70A and the drain oil passage 93 with each other when the spring force (biasing force) is larger than the pressing force by the line pressure control pressure. The line pressure is adjusted by discharging the oil in the pressure oil passage 70 </ b> A through the drain oil passage 93. On the other hand, the line pressure control valve 30 cuts off the communication between the first line pressure oil passage 70A and the drain oil passage 93 when the spring force (biasing force) of the spring 32 is smaller than the pressing force by the line pressure control pressure. Then, the oil discharge 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 in accordance with 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. By supplying the regulated line pressure control pressure to the line pressure control valve 30 through the first control pressure oil passage 91, the line pressure control valve 30 is driven and 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 communicated with the first line pressure oil passage 70A via the second line pressure oil passage 70B and the switching control valve 60. Further, 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. Has been.

  The switching control valve 60 is a discharge destination of the oil discharged from the second discharge port 107B based on the spring force (biasing force) of the spring 62 and the pressing force by 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) communicating directly or indirectly with the first suction oil passage 80A (suction port 106). Switch with.

More specifically, the switching control valve 60 is a second control pressure oil passage (switch pressure oil passage) 92 that communicates with the switch pressure solenoid 50, a first line pressure oil passage 70A, and a second outlet that communicates with the second discharge port 107B. The line pressure oil passage 70B and the second suction oil passage 80B communicating directly or indirectly with the first suction oil passage 80A (suction port 106) are connected. The switching control valve 60 accommodates 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 the spring force (biasing force) F _spring (= K × X (spring collapse allowance)) of the spring 62 and the switch pressure solenoid 50. Oil that communicates with the second line pressure oil passage 70B by driving the spool 61 in the axial direction according to the balance with the pressing force F _SW (switch oil pressure P _SW × pressure receiving area A _SW ) by the switch oil pressure P _SW. The path is switched between the first line pressure oil path 70A and the second suction oil path 80B.

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

  Therefore, when the switch hydraulic pressure is supplied from the switch pressure solenoid 50 described later, the switching control valve 60 communicates the second line pressure oil passage 70B and the second suction oil passage 80B, that is, the second It switches so that the discharge destination of the oil discharged from the discharge port 107B becomes the second suction oil passage 80B (so that it becomes a half discharge state). On the other hand, for example, when the switch hydraulic pressure is not supplied from the switch pressure solenoid 50 (when the switch hydraulic pressure is zero), the switching control valve 60 communicates the second line pressure oil passage 70B and the first line pressure oil passage 70A. In other words, the switching is performed so that the discharge destination of the oil discharged from the second discharge port 107B becomes the first line pressure oil passage 70A (all discharge state is set).

  The switch pressure solenoid 50 determines the discharge destination of the oil discharged from the second discharge port 107B based on the operating state of the continuously variable transmission 110, the first line pressure oil passage 70A, the second suction oil passage 80B, and the like. Switch hydraulic pressure (switching hydraulic pressure) is generated (ie, switching between the full discharge state and the half discharge state). The switch pressure solenoid 50 is connected to the first line pressure oil passage 70A and the second control pressure oil passage (switch pressure oil passage) 92 described above. 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 is connected to one end of the switching control valve 60 (on the side facing the spring 62). Is supplied as switch oil pressure (switching oil 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 hydraulic pressure is made zero.

  As the switch pressure solenoid 50, for example, an on / off solenoid that opens when a voltage is applied and closes when a voltage is stopped is preferably used. The relationship between voltage application / stop and valve opening / closing 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 line pressure (hydraulic pressure) is attached to the first line pressure oil passage 70A. The line pressure sensor 153 is electrically connected to the TCU 150, and the output of the line pressure sensor 153, that is, an electric signal (for example, voltage) corresponding to the line pressure is read into the TCU 150.

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

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

  On the other hand, a vehicle speed sensor 181 for detecting the rotational speed (vehicle speed) of each wheel of the vehicle is connected to the VDCU 180. 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 and the accelerator opening degree from the ECU 170 via the CAN 190, and also receives information such as the vehicle speed from the VDCU 180. The vehicle speed information may be calculated from the rotational speed of the secondary shaft 130 and the total gear ratio between the secondary shaft 130 and the wheels. Alternatively, a vehicle speed sensor may be connected to the TCU 150 to directly detect the vehicle speed.

  The TCU 150 includes a microprocessor that performs calculations, an EEPROM that stores a program for causing the microprocessor to execute each process, a RAM that stores various data such as calculation results, a backup RAM in which the stored contents are held by a battery, And it has an input / output I / F and the like.

  The TCU 150 automatically shifts the gear ratio steplessly in accordance with the driving state of the vehicle (for example, the accelerator pedal opening and the vehicle speed) according to the shift map 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. The TCU 150 controls driving of the line pressure linear solenoid 20 and the switch pressure solenoid 50 described above. That is, the TCU 150 switches the discharge state (full discharge state and half discharge state) of the oil pump 10.

  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 and / or the switching control valve 60 that switches the discharge state is fixed) ( Even when the discharge state of the oil pump 10 is controlled to the partial discharge state at the time of fixing diagnosis), it has a function of protecting the hardware (for example, the chain 140 and the clutch) constituting the continuously variable transmission 110. ing. Therefore, the TCU 150 functionally includes a discharge state switching unit 150a, a target hydraulic pressure setting unit 150b, a pressure adjusting unit 150c, a sticking determination unit 150d, and a sticking determination prohibiting unit 150e. In the TCU 150, a program stored in an EEPROM or the like is executed by a microprocessor, whereby a discharge state switching unit 150a, a target hydraulic pressure setting unit 150b, a pressure adjustment unit 150c, a sticking determination unit 150d, and a sticking determination prohibiting unit 150e. Each function is realized.

  The sticking determination prohibiting unit 150e is a first index value that correlates with the stability of the required hydraulic pressure (target hydraulic pressure) during the sticking diagnosis, and a first degree indicating a margin for the required hydraulic pressure (target hydraulic pressure) of the maximum pressure in the partial discharge state. When at least one of the two index values satisfies a predetermined condition, the target hydraulic pressure setting unit 150b, the pressure adjusting unit 150c, the discharge state switching unit 150a, and the fixing determination unit 150d execute the fixing diagnosis. Prohibited or suspended. In other words, it is determined whether or not the oil pump 10 is stuck, and execution of a series of sequences for detecting the sticking of the oil pump 10 is prohibited or interrupted. That is, the sticking determination prohibiting unit 150e functions as sticking determination prohibiting means described in the claims.

  More specifically, the sticking determination prohibiting unit 150e determines the deviation between the average value (average vehicle speed) of the vehicle speed in a predetermined period (for example, 5 to 10 seconds) and the maximum value and the minimum value of the vehicle speed in the predetermined period ( If the first index value is equal to or higher than a predetermined speed (for example, ± 2 (km / h)), the execution of the sticking diagnosis (determination) is prohibited or interrupted. By the way, it is estimated that the target hydraulic pressure (required hydraulic pressure) is relatively stable because the accelerator pedal is unlikely to be depressed in a state where the vehicle is traveling stably at a constant speed according to the flow of the vehicle group. it can. Therefore, the sticking determination prohibiting unit 150e prohibits or interrupts execution of the sticking determination when not in such a traveling state.

  In addition, the sticking determination prohibiting unit 150e prohibits or interrupts the sticking determination when the change rate of the accelerator opening (corresponding to the first index value) is a predetermined value (for example, 10 (deg / s)) or more. . By the way, when the change rate of the accelerator opening is less than a predetermined value, it is unlikely that the accelerator pedal is depressed, and it can be estimated that the target hydraulic pressure (necessary hydraulic pressure) is relatively stable. Therefore, the sticking determination prohibiting unit 150e prohibits or interrupts the execution of the sticking diagnosis when not in such a traveling state (see t5 in FIG. 4). Note that, instead of or in addition to the change rate of the accelerator opening, the execution of the sticking determination may be prohibited or interrupted when the change amount of the accelerator opening in a predetermined period is equal to or greater than a predetermined value.

  Further, the sticking determination prohibiting unit 150e has a predetermined pressure (for example, 0. 0) that is a deviation (corresponding to the second index value) between the maximum pressure in the partial discharge state and the target hydraulic pressure for normal control set according to the operation state. If it is less than 5 (MPa)), the execution of the sticking diagnosis is prohibited or interrupted. That is, the sticking determination prohibiting unit 150e reduces the difference between the partial discharge maximum pressure and the target hydraulic pressure, and when switching to the partial discharge state when performing the sticking diagnosis, the actual hydraulic pressure decreases and the target hydraulic pressure (required hydraulic pressure) When the risk of falling below the threshold is high (that is, when there is no room), execution of the sticking determination is prohibited or interrupted.

  When execution of the sticking determination is prohibited or interrupted by the sticking determination prohibiting unit 150e, a discharge state switching unit 150a, a target hydraulic pressure setting unit 150b, a pressure adjusting unit 150c, and a sticking determination unit 150d, which will be described later, The normal control is performed without starting the execution (or the execution of the sticking determination is interrupted to return to the normal control) (see t5 in FIG. 4).

  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 connected to the first line pressure oil passage 70A ( The first discharge port 107A communicates with the first line pressure oil passage 70A among the two discharge ports (the first discharge port 107A and the second discharge port 107B), The second discharge port 107B is switched to a semi-discharge state in which the second discharge port 107B communicates directly or indirectly 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 the discharge state switching means described in the claims.

  The target hydraulic pressure (target line pressure) setting unit 150b sets a diagnostic target hydraulic pressure for determining whether or not the oil pump 10 is fixed in a full discharge state or a half discharge state. The target hydraulic pressure setting unit 150b sets the maximum in the half-discharge state as the target hydraulic pressure for diagnosis when performing the sticking determination (diagnosis) to determine whether the oil pump 10 is stuck in the full-discharge state or the half-discharge state. A value higher than the pressure (half discharge maximum pressure + predetermined value) is set. The predetermined value is preferably a value that does not cause erroneous determination in consideration of various variations. That is, the target hydraulic pressure setting unit 150b functions as a target hydraulic pressure setting unit described in the claims.

  More specifically, the diagnostic target hydraulic pressure 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, the maximum pressure in the half-discharge state and the maximum pressure in the full-discharge state are, for example, maps that define the relationship between the engine speed, the oil temperature, and each maximum pressure (half-discharge maximum pressure map, The maximum discharge pressure map) is stored in advance, and the map can be obtained by searching the engine speed and the oil temperature. Each maximum pressure increases as the engine speed increases. On the other hand, the maximum pressure decreases as the oil temperature increases. The target hydraulic pressure setting unit 150b sets the target hydraulic pressure (target line pressure) according to the driving state of the vehicle (for example, vehicle speed, accelerator opening, etc.) when the sticking determination (diagnosis) is not performed, that is, during normal control. To do. A map (diagnostic target oil pressure map) that defines the relationship between the engine speed, oil temperature, and diagnostic target oil pressure is stored in advance, and the map is searched for by the engine speed and oil temperature. The target hydraulic pressure may be obtained directly. 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 so as to control the actual oil pressure (actual line pressure) to coincide with the diagnostic target oil pressure. That is, the pressure adjusting unit 150c functions as a pressure adjusting unit described in the claims.

  The fixing determination unit 150d determines whether or not the oil pump 10 is fixed in a full discharge state or a half discharge state. That is, the sticking determination unit 150d functions as sticking determination means described in the claims. Here, referring to FIG. 3 together, a method for detecting sticking in the full discharge state or the half discharge state will be described in detail. FIG. 3 is a diagram for explaining a sticking detection method (when sticking diagnosis is not interrupted) by the sticking detection device 1 of the oil pump, and a diagnostic target hydraulic pressure (diagnostic target line pressure) at the time of sticking detection execution, An example of the change of the maximum pressure at the time of half discharge and an actual oil pressure (actual line pressure) is shown. In FIG. 3, the normal target oil pressure (normal target line pressure) is also shown. The horizontal axis in FIG. 3 is time (sec), and the vertical axis is hydraulic pressure (MPa). In FIG. 3, the actual line pressure (actual oil pressure) is indicated by a solid line, the diagnostic target line pressure 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 one-dot chain line.

  When the sticking determination prohibiting unit 150e does not prohibit or interrupt the execution of the sticking determination (that is, is permitted), when the diagnosis of the full discharge sticking or the half discharge sticking of the oil pump 10 is executed, The state switching unit 150a drives the switch pressure solenoid 50 to control the discharge state of the oil pump 10 to the full discharge state (see t1 in FIG. 3).

  The target hydraulic pressure setting unit 150b sets a value higher than the maximum pressure in the half discharge state as the diagnostic target hydraulic pressure. At that time, the target hydraulic pressure setting unit 150b gradually increases the diagnostic target hydraulic pressure to a value exceeding the maximum pressure in the half-discharge state with a certain inclination so that the actual hydraulic pressure can follow (t1 in FIG. 3). ~ T2). Here, the 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, the target hydraulic pressure setting unit 150b raises the diagnostic target hydraulic pressure to a value exceeding the maximum pressure in the half-discharge state, and then holds (fixes) the diagnostic target hydraulic pressure at that value (t2 to t4 in FIG. 3). reference). Note that 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 so that it matches the diagnostic target oil pressure.

  The fixing determination unit 150d determines (diagnosis) whether or not it is fixed 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, the sticking determination unit 150d determines that the stick is not stuck in the semi-discharge state when the actual oil pressure rises above the maximum pressure in the half-discharge state (for example, substantially coincides with the target hydraulic pressure for diagnosis). (See t2 to t3 in FIG. 3). On the other hand, when the actual hydraulic pressure does not increase beyond the maximum pressure in the half discharge state, it is determined that the oil pressure is fixed in the half discharge state. Note that the determination (diagnosis) of semi-ejection 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. Control to switch to the state is performed (see t3 in FIG. 3).

  After the control to switch from the full discharge state to the half discharge state is performed, the sticking determination unit 150d determines whether or not there has been a pressure drop equal to or higher than a predetermined pressure and / or the actual hydraulic pressure is a predetermined pressure (maximum pressure in the half discharge state). Based on whether or not it has decreased below, sticking in the full discharge state is determined. That is, after the control to switch from the full discharge state to the half discharge state is performed, the sticking determination unit 150d determines that the stick is not stuck in the full discharge state when the actual hydraulic pressure has decreased by a predetermined value or more within a predetermined time. . On the other hand, when the actual oil pressure does not decrease by a predetermined value or more, it is determined that the oil pressure is fixed in the full discharge state (see t3 to t4 in FIG. 3). At that 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 the semi-discharge state is switched to the normal state. In addition, the predetermined value is based on the difference between the diagnostic target hydraulic pressure and the half discharge maximum pressure, for example, based on the engine speed and the oil temperature, or between the diagnostic target hydraulic pressure and the half discharge maximum pressure. It is set according to the difference. Further, after the control to switch from the full discharge state to the half discharge state is performed, the sticking determination unit 150d is not stuck in the full discharge state when the actual hydraulic pressure drops below the maximum pressure in the half discharge state for a certain time. Is determined. On the other hand, when the actual 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 (see t3 to t4 in FIG. 3). Here, it is preferable to set the fixed time short as long as the reliability of the sticking determination is not lowered. After the sticking determination (diagnosis) is completed, the diagnosis target hydraulic pressure is returned to the normal target hydraulic pressure (target line pressure) (see t4 to FIG. 3).

  Next, the operation (sticking detection method) of the oil pump sticking detection device 1 will be described with reference to FIGS. FIG. 4 is a diagram for explaining a sticking detection method (when sticking diagnosis is interrupted) by the sticking detecting device 1 of the oil pump. 5 and 6 are flowcharts showing the processing procedure of the sticking detection process by the sticking detection device 1 of the oil pump. This process is mainly executed repeatedly in the TCU 150 every predetermined time (for example, every 10 ms).

  In step S100, the engine speed, oil temperature, vehicle speed, accelerator opening, and the like are read. Next, in step S102, the deviation between the average vehicle speed (average vehicle speed) in a predetermined period (for example, 5 to 10 seconds) and the maximum value and minimum value of the vehicle speed in the predetermined period is a predetermined speed (for example, ± 2). A determination is made as to whether or not (km / h)). If the deviation is greater than or equal to the predetermined speed, the process proceeds to step S132 after the sticking diagnosis is interrupted in step S138. On the other hand, when the deviation is less than the predetermined speed, the process proceeds to step S104.

  In step S104, it is determined whether or not the change rate of the accelerator opening is equal to or greater than a predetermined value (for example, 10 (deg / s)). Here, when the change rate of the accelerator opening is less than the predetermined value, the process proceeds to step S106. On the other hand, when the change rate of the accelerator opening is equal to or greater than the predetermined value, the process proceeds to step S132 after the sticking diagnosis is interrupted in step S138.

  In step S106, whether or not the deviation between the maximum pressure in the partial discharge state and the target hydraulic pressure for normal control set according to the operating state is less than a predetermined pressure (for example, 0.5 (MPa)). Judgment is made. Here, when the deviation is less than the predetermined pressure, after the sticking diagnosis is interrupted in step S138, the process proceeds to step S132. On the other hand, when the deviation is equal to or greater than the predetermined pressure, the process proceeds to step S108.

  In step S108, the switch pressure solenoid 50 is driven to control the discharge state of the oil pump 10 to the full discharge state (see t1 in FIG. 3).

  Subsequently, in step S110, a value (half discharge maximum pressure + predetermined value) higher than the maximum pressure in the half discharge state is set as the diagnostic target oil pressure. At that time, the target hydraulic 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 hydraulic pressure can follow. Further, the actual hydraulic pressure is adjusted so as to coincide with the diagnostic target hydraulic pressure (see t1 to t2 in FIG. 3).

  In step S112, a determination is made as to whether or not the diagnostic target hydraulic pressure has increased (reached) to a value (half discharge maximum pressure + predetermined value) that exceeds the maximum pressure in the half discharge state. If the diagnostic target hydraulic pressure has not increased to a value that exceeds the maximum pressure in the half-discharge state, the process proceeds to step S110, and the diagnostic target hydraulic pressure reaches a value that exceeds the maximum pressure in the half-discharge state. Until it rises, the process of step S110-step S112 mentioned above is repeatedly performed. On the other hand, when the diagnostic target hydraulic pressure rises to a value exceeding the maximum pressure in the half-discharge state, the process proceeds to step S114.

  When the diagnostic target hydraulic pressure is increased to a value exceeding the maximum pressure in the half-discharge state, the diagnostic target hydraulic pressure is held (fixed) at that value in step S114 (see t2 to t4 in FIG. 3). Then, after the target hydraulic pressure for diagnosis is increased to a value exceeding the maximum pressure in the semi-discharge state, when a predetermined time has elapsed, in step S116, a determination (diagnosis) as to whether or not it is stuck in the semi-discharge state is made. Be started.

  In the subsequent step S118, after the diagnosis is started, it is determined whether or not the actual hydraulic pressure has exceeded the maximum pressure in the half-discharge state for a certain period of time. Here, when the actual hydraulic pressure exceeds the maximum pressure in the half-discharge state for a certain time, the process proceeds to step S120. On the other hand, when the actual hydraulic pressure does not exceed the maximum pressure in the half discharge state for a certain time, the process proceeds to step S134.

  When the actual hydraulic pressure exceeds the maximum pressure in the semi-discharge state (for example, substantially coincides with the target hydraulic pressure for diagnosis), in step S120, it is determined that the semi-discharge state is not fixed (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 S122, the switch pressure solenoid 50 is driven to control the discharge state of the oil pump 10 to the half-discharge state. Is performed (see t3 in FIG. 3).

  Then, in step S124, after the control to switch from the full discharge state to the half discharge state is performed, whether or not the actual oil pressure has decreased by a predetermined value or more within a predetermined time (that is, whether or not there has been a pressure drop of a predetermined pressure or more). Is determined. Here, when the actual hydraulic pressure has decreased by a predetermined value or more (pressure drop) within a predetermined time, the process proceeds to step S126. On the other hand, if the actual hydraulic pressure has not decreased by a predetermined value or more (pressure drop) within a predetermined time, it is determined in step S130 that the discharge is fixed in the full discharge state (abnormal determination), and then the process proceeds to step S132. Transition.

  In step S126, a determination is made as to whether or not the actual hydraulic pressure has dropped below a predetermined pressure (half discharge maximum pressure) for a certain period of time. Here, if the actual hydraulic pressure has dropped below a predetermined pressure (half discharge maximum pressure) for a certain period of time, it is determined in step S128 that it is not firmly fixed in the full discharge state (normal determination), and then, in step S132. Processing shifts. On the other hand, when the actual hydraulic pressure does not drop below the predetermined pressure (half discharge maximum pressure) for a certain period of time, it is determined in step S130 that it is stuck in the full discharge state (abnormal determination), and then the process proceeds to step S132. (See t3 to t4 in FIG. 3).

  In step S132, the sticking diagnosis is terminated, and the target hydraulic pressure is returned from the diagnostic target hydraulic pressure to the normal target hydraulic pressure (target line pressure) (see t4 to FIG. 3).

  On the other hand, for example, when the change rate of the accelerator opening becomes equal to or higher than a predetermined value at t5 in FIG. 4, the sticking diagnosis is interrupted as described above. Then, the discharge state of the oil pump 10 is switched from the half discharge state to the full discharge state, and the target hydraulic pressure is returned from the diagnostic target hydraulic pressure to the target hydraulic pressure for normal control. As a result, the actual hydraulic pressure is controlled to satisfy the target hydraulic pressure (required hydraulic pressure). When the half discharge state is continued without interruption of the sticking diagnosis, the actual hydraulic pressure falls below the required hydraulic pressure (target hydraulic pressure) (see the hatched area in FIG. 4).

  Returning to FIG. 3, if the above-described step S118 is negative, in step S134, it is further determined whether or not the actual hydraulic pressure is equal to or lower than the maximum pressure in the half-discharge state for a certain time. Here, if the actual hydraulic pressure is equal to or lower than the maximum pressure in the semi-discharge state for a certain time, it is determined in step S136 that the oil is stuck in the semi-discharge state (abnormality determination), and then the process proceeds to step S132. Transition. On the other hand, if the actual hydraulic 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 hydraulic pressure is hunting. To do.

  As described above, in step S132, the sticking diagnosis is completed, and the target hydraulic pressure is returned from the diagnostic target hydraulic pressure to the normal target hydraulic pressure (target line pressure).

  As described above in detail, according to the present embodiment, when the sticking determination for determining whether or not the oil pump 10 is stuck is performed, that is, the discharge state of the oil pump 10 is set to the semi-discharge state. When control is performed and the diagnosis target oil pressure is set to a value higher than the maximum pressure in the half-discharge state, and the oil pressure is adjusted to match the diagnosis target oil pressure, the required oil pressure during the sticking diagnosis At least one of a first index value correlated with the stability of (target hydraulic pressure) and a second index value indicating a margin for the required hydraulic pressure (target hydraulic pressure) of the maximum pressure in the partial discharge state is predetermined. If the condition is satisfied, execution of the sticking diagnosis by the target oil pressure setting unit 150b, the pressure adjusting unit 150c, the discharge state switching unit 150a, and the sticking determination unit 150d is prohibited or interrupted. For this reason, for example, when performing a sticking diagnosis, when the required oil pressure (target oil pressure) is assumed to be low in stability, or when the margin for the required oil pressure (target oil pressure) of the maximum pressure in the partial discharge state is low Furthermore, the execution of the sticking diagnosis can be prohibited or interrupted. As a result, even if the discharge state of the oil pump 10 is controlled to the partial discharge state at the time of the sticking diagnosis, it is possible to protect the hardware constituting the continuously variable transmission 110.

  More specifically, according to the present embodiment, when the deviation between the average vehicle speed (average vehicle speed) in a predetermined period and the maximum value and minimum value of the vehicle speed in a predetermined period is greater than or equal to a predetermined speed, the sticking diagnosis Therefore, the hardware of the continuously variable transmission 110 can be protected.

  Further, according to the present embodiment, since the execution of the sticking diagnosis is prohibited or interrupted when the change rate of the accelerator opening is equal to or higher than a predetermined value, the hardware constituting the continuously variable transmission 110 is protected. Is possible.

  Furthermore, according to the present embodiment, the execution of the sticking diagnosis is prohibited or interrupted when the deviation between the maximum pressure in the partial discharge state and the target hydraulic pressure for normal control set according to the operating state is less than a predetermined pressure. The For this reason, the difference between the partial discharge maximum pressure and the target hydraulic pressure becomes small, and there is a high possibility that the actual hydraulic pressure will drop and fall below the target hydraulic pressure (necessary hydraulic pressure) when switching to the partial discharge state when performing a sticking diagnosis. The execution of the sticking determination can be prohibited or interrupted (that is, when there is no room). As a result, it is possible to protect the hardware constituting the continuously variable transmission 110.

  On the other hand, according to the present embodiment, when the sticking determination for determining whether the oil pump 10 is stuck in the full discharge state or the half discharge state is performed, first, the discharge state of the oil pump 10 is changed to the full discharge state. As a diagnostic target hydraulic pressure for determining whether the oil pump 10 is fixed in the full discharge state or the half discharge state, a value higher than the maximum pressure in the half discharge state is set. Then, the hydraulic pressure in the first line pressure oil passage 70A (high pressure oil passage) is adjusted so as to coincide with the diagnostic target oil pressure. That is, when the actual hydraulic pressure is increased so as to coincide with the diagnostic target hydraulic pressure, by controlling to the full discharge state, the time required for the half discharge high pressure state in the normal state (that is, when the half discharge is not fixed) Can be reduced. After that, control is performed to switch the discharge state of the oil pump 10 from the full discharge state to the half discharge state, and when the hydraulic pressure drops below the maximum pressure in the half discharge state, it is determined that the oil pump 10 is not stuck 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 whether or not the full discharge is fixed in a relatively short time. As described above, it is possible to shorten the time for the semi-discharge state and the high pressure state, that is, the time for generating abnormal noise that can occur in the partial discharge high pressure state.

  In addition, according to the present embodiment, after the control to switch 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 to half. When the pressure drops below the maximum pressure in the discharge state, it is determined that the pressure is not fixed in the full discharge state, and the oil pressure does not drop above the predetermined value, or the oil pressure does not drop below the maximum pressure in the half discharge state. In this case, it is determined that the toner is fixed in the entire discharge state. That is, it is determined whether or not the total discharge is fixed based on the value of the oil pressure in addition to the amount of decrease in the oil pressure. Therefore, it is possible to more reliably determine whether or not all discharges are fixed in a relatively short time (that is, while shortening the holding time in the half-discharge state). At this time, 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 all the discharges are fixed.

  Further, according to the present embodiment, when the discharge state of the oil pump 10 is controlled to be the full discharge state, when the regulated hydraulic pressure has increased beyond the maximum pressure in the half discharge state, When it is determined that the semi-discharge state is not fixed, and when the hydraulic pressure does not increase beyond the maximum pressure in the semi-discharge state, it is determined that the semi-discharge state is fixed. Therefore, at the time of normal operation (that is, when the half discharge is not fixed), it is possible to reduce the time for the half discharge state by determining the presence or absence of the half discharge fixation while maintaining the full discharge state.

  Further, according to the present embodiment, after the diagnostic target hydraulic pressure is increased to a value exceeding the maximum pressure in the half-discharge state, the diagnostic target hydraulic pressure is held (fixed), and the diagnostic target hydraulic pressure is in the half-discharge state. After a rise to a value exceeding the maximum pressure, when a predetermined time has elapsed, a determination is made as to whether or not it is fixed in a half-discharge 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 diagnosis target hydraulic pressure is gradually increased to a value exceeding the maximum pressure in the half-discharge state with a certain slope so that the actual hydraulic pressure can follow when performing the sticking determination. Therefore, it is possible to prevent erroneous determination by increasing the diagnostic target hydraulic pressure in consideration of the followability (delay) of the actual hydraulic pressure.

  Further, according to this embodiment, the half discharge maximum pressure is obtained based on the engine speed and the oil temperature, and the diagnostic target hydraulic pressure is set, so that the sticking determination can be performed with higher accuracy. Become.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above embodiment, an example of the numerical value (threshold value) of each condition for prohibiting or interrupting the sticking diagnosis is shown, but the numerical value (threshold value) of each condition is not limited to the above embodiment, It can be arbitrarily set according to required requirements. Moreover, it is good also as a structure which judges whether sticking determination is prohibited only at the time of a semi-discharge state.

  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 may be applied to a stepped automatic transmission (Step AT), a 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 The present invention can also be applied to continuously variable transmissions.

  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. Moreover, in the said embodiment, although the vane pump was used as the oil pump 10, it can replace with a vane pump and can also use an internal gear type gear pump, a trochoid pump, etc., for example.

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

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

  In the above-described embodiment, two methods (that is, a method using a hydraulic pressure value and a method using a decrease amount (decrease width) of hydraulic pressure) are used in combination in order to determine sticking in the full discharge state. It is good also as a structure which uses only one method. In the above embodiment, the diagnostic target hydraulic pressure (and actual hydraulic pressure) is increased in the full discharge state. However, the diagnostic target hydraulic pressure (and actual hydraulic pressure) may be increased in the half discharge state.

DESCRIPTION OF SYMBOLS 1 Oil pump adhering detection apparatus 10 Oil pump 106 Inlet 107A 1st outlet 107B 2nd outlet 20 Line pressure linear solenoid 30 Line pressure control valve 50 Switch pressure solenoid 60 Switching control valve 70A 1st line pressure oil path 70B 1st 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 adjusting unit 150d Adherence determination unit 150e Adhesion determination prohibition 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 (12)

An oil pump that boosts the oil sucked from the suction port and discharges it from a plurality of discharge ports;
A discharge state of the oil pump, a full discharge state in which all of the plurality of discharge ports are in communication with a high-pressure oil passage, or a part of the plurality of discharge ports in communication with the high-pressure oil passage; and A discharge state switching means for switching to a partial discharge state in which some other discharge ports communicate with the suction port of the oil pump;
Target oil pressure setting means for setting a target oil pressure for diagnosis for determining whether or not the oil pump is fixed in a full discharge state or a partial discharge state;
Pressure adjusting means for adjusting the hydraulic pressure of the high-pressure oil passage so as to match the diagnostic target hydraulic pressure;
Based on the hydraulic pressure regulated by the pressure regulating means, a sticking determination means for judging whether or not the oil pump is stuck in a full discharge state or a partial discharge state;
Based on at least one of the first index value correlated with the stability of the required oil pressure during the fixation diagnosis and the second index value indicating the margin of the maximum pressure in the partial discharge state with respect to the required oil pressure, A sticking determination prohibiting means for prohibiting or interrupting execution of the sticking determination for determining whether or not the oil pump is sticking,
When performing the sticking determination to determine whether or not the oil pump is sticking,
The target hydraulic pressure setting means sets a value higher than the maximum pressure in the partial discharge state as the diagnostic target hydraulic pressure,
The pressure adjusting means adjusts the hydraulic pressure so as to match the diagnostic target hydraulic pressure,
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 a full discharge state based on the relationship between the hydraulic pressure after the partial discharge state is controlled and the maximum pressure in the partial discharge state. And
The sticking determination prohibiting means, when at least one of the first index value and the second index value satisfies a predetermined condition, the target hydraulic pressure setting means, the pressure regulating means, An oil pump sticking detection apparatus characterized by prohibiting or interrupting execution of sticking judgment by the discharge state switching means and the sticking judgment means.   The sticking determination prohibiting means prohibits or interrupts the sticking determination when a deviation between an average value of the vehicle speed in a predetermined period and each of the maximum value and the minimum value of the vehicle speed in the predetermined period is a predetermined speed or more. The oil pump sticking detection device according to claim 1, characterized in that:   3. The oil pump sticking according to claim 1, wherein the sticking determination prohibiting unit prohibits or interrupts the sticking determination when the change rate or change amount of the accelerator opening is equal to or greater than a predetermined value. Detection device.   The sticking determination prohibiting means prohibits or interrupts the sticking determination when the deviation between the maximum pressure in the partial discharge state and the target hydraulic pressure for normal control set in accordance with the operating state is less than a predetermined pressure. The oil pump sticking detection device according to any one of claims 1 to 3, wherein the oil pump sticking detection device is provided.     After the control for setting the partial discharge state is performed, the sticking determination unit determines that the pressure is not fixed in the full discharge state when the hydraulic pressure is equal to or lower than the maximum pressure in the partial discharge state, and the hydraulic pressure is the maximum in the partial discharge state. The oil pump sticking detection device according to any one of claims 1 to 4, wherein when it is higher than the pressure, it is judged that the oil pump is stuck in a full discharge state. When performing the sticking determination to determine whether the oil pump is stuck 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 hydraulic pressure setting means sets a value higher than the maximum pressure in the partial discharge state as the diagnostic target hydraulic pressure,
The pressure adjusting means adjusts the hydraulic pressure so as to match the diagnostic target hydraulic pressure,
after that,
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,
The sticking determination means is stuck in the full discharge state when the oil pressure drops below 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. The oil pump sticking detection according to any one of claims 1 to 5, wherein when the oil pressure does not decrease by a predetermined value or more, it is judged that the oil pump is stuck in a full discharge state. apparatus.   The sticking determination means is configured to control that the discharge state of the oil pump is switched from the full discharge state to the partial discharge state, and within a predetermined time, the oil pressure decreases by a predetermined value or more and the oil pressure is in the partial discharge state. If the pressure drops below the maximum pressure, it is determined that the pressure is not fixed in the full discharge state, and if the oil pressure does not drop below the predetermined value, or if the oil pressure does not drop below the maximum pressure in the partial discharge state, all The oil pump sticking detection device according to claim 6, wherein it is determined that the oil pump is stuck in a discharge state.   8. The oil pump sticking detection device according to claim 6 or 7, wherein the sticking determination means sets the predetermined value based on an engine speed and an oil temperature.   The sticking determination means is in a partial discharge state when the regulated hydraulic pressure rises above the maximum pressure in the partial discharge state when the discharge state of the oil pump is controlled to be a full discharge state. 9. If it is determined that the pressure is not fixed, and if 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. The oil pump sticking detection device according to the item.   7. The target hydraulic pressure setting means gradually increases the diagnostic target hydraulic pressure to a value exceeding a maximum pressure in a partial discharge state with a certain inclination when performing the sticking determination. The sticking detection apparatus of the oil pump of any one of -9. The target hydraulic pressure setting means holds the diagnostic target hydraulic pressure after raising the diagnostic target hydraulic pressure to a value exceeding the maximum pressure in the partial discharge state,
The adhering determination means starts determining whether the adhering in the partial discharge state has occurred after a predetermined time has elapsed after the diagnostic target hydraulic pressure has been increased to a value exceeding the maximum pressure in the partial discharge state. The oil pump sticking detection device according to claim 10. The sticking determination means obtains the maximum pressure in the partial discharge state based on the engine speed and the oil temperature, and sets the diagnostic target hydraulic pressure. The oil pump sticking detection device according to the item.

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