JP6689722B2 - Valve abnormality diagnosis device - Google Patents

Description

  The present invention is a device for diagnosing a pressure control abnormality due to wear of a valve bore of a control valve, which is suitable for diagnosing an abnormality of a control valve for controlling a belt gripping hydraulic pressure by a pulley of a continuously variable transmission for a vehicle, The present invention relates to a valve abnormality diagnosis device.

  Hydraulic pressure is generally used to control the continuously variable transmission for vehicles, and a so-called control valve controls hydraulic pressure supply to control the continuously variable transmission. However, if a failure occurs in the hydraulic pressure supply system and it becomes impossible to supply the required hydraulic pressure, not only will the prescribed gear change not be possible, but in the case of a belt type continuously variable transmission, for example, the thrust (the force that grips the belt with the pulley) Shortage causes belt slippage, which accelerates deterioration of the belt and pulley.

  Therefore, Patent Document 1 proposes a technique for reducing the output of the engine when detecting a failure of the hydraulic pressure generator (hydraulic pressure supply system) to suppress the slip of the belt and to protect the belt and the pulley. . Note that Patent Document 1 does not specifically describe the failure detection of the hydraulic pressure generator.

JP-A 1-269620

  By the way, one of the failures of the hydraulic pressure supply system is a malfunction of the control valve. For example, if the inner peripheral wall of the valve bore (spool chamber) of the control valve is worn, the malfunction of the control valve occurs. This malfunction can be detected as a situation in which the actual pressure does not rise to the indicated pressure because pressure oil leaks in the control valve. For example, the actual pressure of the secondary pulley to which the line pressure is introduced is detected, and if this pressure cannot be increased to the instructed line pressure, it can be determined that an abnormality has occurred in the control valve.

  Therefore, if it is determined that the control valve is abnormal because the actual pressure does not rise to the indicated pressure, it is possible to reduce the throttle opening, for example, and perform fail-safe to reduce the output of the engine. In this case, the control valve is replaced after that based on the detection of the abnormality of the control valve.

  However, such a decrease in the actual pressure may occur due to factors other than the abnormality of the control valve, such as open sticking of the valve spool due to biting of contaminants (hereinafter referred to as contaminants). In this case, if it is erroneously determined that the valve bore of the control valve has worn, the control valve may be replaced unnecessarily.

  The present invention has been devised in view of the above problems, and it is possible to reliably determine an abnormality due to advanced wear of the valve bore of the control valve, and prevent or suppress unnecessary control valve replacement. An object of the present invention is to provide a valve abnormality diagnosing device that is made possible.

  (1) In order to achieve the above object, a valve abnormality diagnosing device of the present invention has a spool inserted in a valve bore, and an axial direction of the spool so that a hydraulic pressure corresponding to an indicated pressure is generated. A valve abnormality diagnosing device for adjusting a position, diagnosing an abnormality due to wear of the valve bore of a control valve of a vehicle hydraulic device, and an actual pressure detecting means for detecting an actual pressure which is the generated hydraulic pressure, and preset. The first condition is that the actual pressure becomes higher than the first indicated pressure when the first indicated pressure lower than the given prescribed pressure is given, and the second condition higher than the prescribed pressure. The valve bore is abraded when the second condition, which is that the actual pressure becomes lower than the second command pressure when the command pressure is applied, satisfies the determination condition including that both are satisfied. Judgment to determine that It is characterized by a means.

  (2) The first condition includes that the actual pressure is higher than the first instruction pressure by a first predetermined differential pressure or more for a first predetermined time or longer, and the second condition is the actual pressure. It is preferable that a state in which the pressure is lower than the second instruction pressure by a second predetermined differential pressure or more continues for a second predetermined time or more.

  (3) The first predetermined differential pressure and the second predetermined differential pressure are the first designated pressure or the second designated pressure in a transient state in which the first designated pressure or the second designated pressure fluctuates. It is preferable that the pressure is set to a value larger than that in the steady state where the indicated pressure of 2 is stable.

  (4) It is preferable that the determination condition is that the first condition and the second condition are both satisfied a plurality of times within a predetermined period.

  (5) It is preferable that the determination means determines the determination condition within one trip in which the key switch of the vehicle is continuously turned on.

  (6) The vehicle hydraulic device is a vehicle continuously variable transmission having two pulleys and a belt spanning the pulleys, and the control valve controls the belt gripping hydraulic pressure of the pulleys. It is preferable that

  (7) The predetermined pressure has a first predetermined pressure and a second predetermined pressure that is higher than the first predetermined pressure, and the determination means is the first lower pressure that is lower than the first predetermined pressure. Is applied, the first condition is that the actual pressure becomes higher than the first indicated pressure, and the second indicated pressure that is higher than the second predetermined pressure is given. And the second condition that the actual pressure becomes lower than the second instruction pressure when the determination conditions are satisfied, including that both are satisfied, the valve bore is in a worn state. It is preferable to determine that there is.

  According to the present invention, the first condition in which the actual pressure is higher than the first indicated pressure that is lower than the predetermined pressure, and the second condition that the actual pressure is lower than the second indicated pressure that is higher than the predetermined pressure are both. If the above condition is also satisfied, it is determined that the valve bore is in a worn state, so that erroneous detection can be suppressed and unnecessary control valve replacement can be prevented.

1 is a schematic configuration diagram of a drive system of a vehicle to which an abnormality diagnosis device according to an embodiment of the present invention is applied. 1 is a block diagram showing a vehicle control device (including an abnormality diagnosis device) to which an abnormality diagnosis device according to an embodiment of the present invention is applied, and an input / output element around the control device. It is a figure which shows the hydraulic circuit structure to the primary hydraulic chamber, the secondary hydraulic chamber, and the low brake among the hydraulic control circuits which concern on one Embodiment of this invention. It is a figure which shows the characteristic of the actual pressure with respect to the instruction | indication pressure explaining the abnormality diagnosis by the abnormality diagnosis apparatus which concerns on one Embodiment of this invention by contrasting the normal time of a control valve, and the time of abnormality, (a) is oil temperature. Is in the normal temperature range, and (b) shows the case in which the oil temperature is in the high temperature range. It is a figure which shows the time variation example of the instruction | indication pressure and actual pressure explaining the abnormality diagnosis by the abnormality diagnosis apparatus which concerns on one Embodiment of this invention. It is a flow chart explaining abnormality diagnosis by an abnormality diagnosis device concerning one embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Note that the embodiments described below are merely examples, and there is no intention to exclude various modifications and application of techniques that are not explicitly shown in the following embodiments. The configurations of the following embodiments can be variously modified and implemented without departing from the spirit thereof, and can be appropriately selected or combined as needed.

[Vehicle drive system configuration]
The control valve to be diagnosed by the abnormality diagnosing device according to the present embodiment is applied to the continuously variable transmission that constitutes the drive system of the vehicle.

  FIG. 1 is a schematic configuration diagram of a drive system of a vehicle to which an abnormality diagnosis device according to an embodiment of the present invention is applied. As shown in FIG. 1, this vehicle includes an engine 1 as a drive source, and the output rotation of the engine 1 includes a torque converter 2 having a lockup clutch 2a, a first gear train 3, a continuously variable transmission for a vehicle (hereinafter , Simply referred to as "transmission 4"), and is transmitted to the drive wheels 7 via the second gear train 5 and the differential device 6. The second gear train 5 is provided with a parking mechanism 8 that mechanically locks the output shaft of the transmission 4 so that it cannot rotate during parking.

  The transmission 4 is provided with an oil pump 10 as a hydraulic pressure source. The mechanical oil pump 10 that receives the rotation of the engine 1 and is driven by utilizing a part of the power of the engine 1 is applied to the oil pump 10. Then, an electric oil pump driven by receiving power supply from the battery 13 may be used. Further, in FIG. 1, the mechanical oil pump 10 is shown at two places, but the same pump is shown at each part for convenience.

  The lockup clutch 2a is engaged when the vehicle speed exceeds the lockup start vehicle speed, and is released when the vehicle speed falls below the lockup release vehicle speed.

  The transmission 4 includes a belt type continuously variable transmission mechanism (hereinafter referred to as “variator”) 20 and an auxiliary transmission mechanism 30 provided in series with the variator 20. “Installed in series” means that the variator 20 and the auxiliary transmission mechanism 30 are installed in series in the power transmission path from the engine 1 to the drive wheels 7. The subtransmission mechanism 30 may be directly connected to the output shaft of the variator 20 as in this example, or may be connected via another speed change or power transmission mechanism (for example, a gear train). Alternatively, the auxiliary transmission mechanism 30 may be connected to the front stage (on the input shaft side) of the variator 20.

  The variator 20 includes a primary pulley 21, a secondary pulley 22, and a V belt 23 wound around the pulleys 21 and 22. Although not shown in detail, the pulleys 21 and 22 are movable conical plates each of which is provided with a fixed conical plate and a sheave surface opposed to the fixed conical plate and forms a V groove between the fixed conical plate. And hydraulic cylinders 23a, 23b provided on the back surface of the movable conical plate to displace the movable conical plate in the axial direction. When the hydraulic pressure supplied to the hydraulic cylinders 23a and 23b is adjusted, the width of the V groove is changed, the contact radius between the V belt 23 and the pulleys 21 and 22 is changed, and the speed ratio of the variator 20 is continuously changed. .

  The auxiliary transmission mechanism 30 is a transmission mechanism having two forward gears and one reverse gear. The subtransmission mechanism 30 is connected to a Ravigneaux-type planetary gear mechanism 31 in which carriers of two planetary gears are connected to each other and a plurality of rotating elements that configure the Ravigneaux-type planetary gear mechanism 31, and a plurality of friction elements that change their linked states. A fastening element (a low brake 32, a high clutch 33, a Rev brake 34) is provided. When the hydraulic pressures supplied to the oil chambers of the friction engagement elements 32 to 34 are adjusted and the engagement / release states of the friction engagement elements 32 to 34 are changed, the shift speed of the auxiliary transmission mechanism 30 is changed.

  For example, by engaging the low brake 32 and releasing the high clutch (also abbreviated as H / C) 33 and the Rev brake 34, the shift stage of the auxiliary transmission mechanism 30 becomes the first speed. When the high clutch 33 is engaged and the low brake 32 and the Rev brake 34 are released, the shift stage of the auxiliary transmission mechanism 30 becomes the second speed, which has a smaller gear ratio than the first speed. Further, when the Rev brake 34 is engaged and the low brake 32 and the high clutch 33 are released, the shift stage of the auxiliary transmission mechanism 30 is set in reverse. In the following description, "the transmission 4 is in the low speed mode" when the shift stage of the auxiliary transmission mechanism 30 is in the first speed, and "the transmission 4 is in the high speed mode" when in the second speed. Express.

  Each frictional engagement element is provided on the power transmission path at a front stage or a rear stage of the variator 20, and when both are fastened, the power transmission of the transmission 4 is enabled, and when released, the power transmission of the transmission 4 is disabled. To

[Configuration of control system]
The controller 12 is a controller that integrally controls the engine 1 and the transmission 4, and is also referred to as an ECU (Electronic Control Unit). FIG. 2 is a block diagram showing the controller 12 and its peripheral input / output elements. Although not shown in detail, the controller 12 is composed of a CPU, a storage device including a RAM / ROM, an input interface, an output interface, and a bus interconnecting these.

  The input interface includes an output signal of an accelerator opening sensor (accelerator operation amount detecting means) 41 for detecting an accelerator opening APO which is an operation amount of an accelerator pedal, an input rotation speed of a transmission 4 (= rotation speed of a primary pulley 21). , Hereinafter, referred to as "primary rotation speed Npri"), an output signal of a rotation speed sensor 42 for detecting a vehicle speed VSP, an output signal of a vehicle speed sensor 43 for detecting a vehicle speed VSP, an output signal of a line pressure sensor 44 for detecting a line pressure PL, and a select signal. An output signal of an inhibitor switch 45 that detects the position of the lever, an output signal of a brake fluid pressure sensor 46 that detects the brake fluid pressure, and an engine rotation speed sensor (engine rotation speed detection means) 47 that detects the rotation speed of the engine. Output signal Oil temperature sensor that detects the temperature of the hydraulic fluid (ATF) of the transmission (oil temperature detection ) Detected by output signals 48 are input. In addition, each rotation speed is also referred to as a rotation speed (rotation speed per unit time).

  The storage device stores a control program for the engine 1, a shift control program for the transmission 4, and various map tables used in these programs. The CPU reads and executes the program stored in the storage device, performs various arithmetic processes on various signals input through the input interface, and outputs a fuel injection amount signal, an ignition timing signal, and a throttle opening signal. , A shift control signal, and the like, and outputs the generated signal to the engine 1, the hydraulic control circuit 11, etc. through the output interface. Various values used by the CPU in the arithmetic processing and the arithmetic results thereof are appropriately stored in the storage device.

  The controller 12 includes, as functional elements, an engine control unit 12A that controls the fuel injection amount of the engine 1, an ignition timing, a throttle opening degree, and the like, and a shift control unit 12B that controls the transmission 4 through the hydraulic control circuit 11. There is. Further, in the shift control unit 12B, a determination unit (determination unit) 12c included in the valve abnormality diagnosis device according to the present embodiment is provided as a functional element.

  The hydraulic control circuit 11 includes a plurality of flow paths and a plurality of hydraulic control valves. The hydraulic control circuit 11 controls a plurality of hydraulic control valves based on a shift control signal from the controller 12 to switch the hydraulic pressure supply path and adjust a necessary hydraulic pressure from the hydraulic pressure generated by the oil pump 10. It is supplied to each part of the transmission 4. As a result, the gear ratio of the variator 20 and the gear stage of the auxiliary transmission mechanism 30 are changed, and the transmission 4 is shifted.

[Structure of hydraulic circuit]
Next, the hydraulic circuit configuration for the primary hydraulic chamber 23a and the secondary hydraulic chamber 23b provided in the hydraulic control circuit 11 will be described with reference to FIG.

  As shown in FIG. 3, the shift hydraulic pressure of the hydraulic oil supplied to the primary hydraulic chamber 23 a of the primary pulley 21 and the secondary hydraulic chamber 23 b of the secondary pulley 22 is the discharge pressure from the mechanical oil pump 10 driven by the engine 1. It is generated by the hydraulic control circuit 11 based on the above. The hydraulic control circuit 11 includes a pressure regulator valve 111, a pilot valve 112, a primary solenoid valve 118, and a primary control valve 119.

  It should be noted that the hydraulic pressure in the primary hydraulic chamber 23a is adjusted with respect to the hydraulic pressure in the secondary hydraulic chamber 23b to change gears (change the gear ratio), and the hydraulic pressure in the secondary hydraulic chamber 23b is adjusted to hold the belts by the pulleys 21 and 22. The force (thrust) is adjusted to prevent the V belt 23 from slipping on the pulleys 21 and 22. Therefore, the hydraulic pressure in the primary hydraulic chamber 23a corresponds to the belt gripping hydraulic pressure of the pulleys 21 and 22.

  The pressure regulator valve 111 is a valve that regulates the line pressure PL from the pump discharge pressure, and has a line pressure port 111a, a closing port 111b, and a drain port 111c. Then, the spring force and the actuation signal pressure generated by the line pressure solenoid (not shown) act on one end of the valve spool 111d, and the feedback pressure acts on the other end. The line pressure oil passage 115 is connected to the line pressure port 111a, and the line pressure oil passage 115 is connected to the secondary hydraulic chamber 23b without a valve. Therefore, the pressure regulator valve 111 also functions as a secondary control valve. The line pressure oil passage 115 is connected to the line pressure port 112a of the pilot valve 112 and the line pressure port 119a of the primary control valve 119.

  The pilot valve 112 is a valve that creates a pilot pressure Pp whose hydraulic upper limit of the line pressure PL is restricted, and has a line pressure port 112a, a pilot pressure port 112b, and a drain port 112c. Then, the spring force acts on one end side of the valve spool 112d, and the feedback pressure acts on the other end side. A pilot pressure oil passage 116 for supplying pilot pressure Pp to a low brake solenoid valve (not shown) is connected to the pilot pressure port 112b.

The primary solenoid valve 118 is a valve that regulates the operation signal pressure of the primary control valve 119 using the pilot pressure Pp as a source pressure, and has a pilot pressure port 118a, an operation signal pressure port 118b, and a drain port 118c. Then, the spring force acts on one end side of the valve spool 118d, and the solenoid force and the feedback pressure act on the other end side. If there is no solenoid force, the spring force brings the pilot pressure port 118a and the actuation signal pressure port 118b into communication with each other. On the other hand, when the solenoid force that overcomes the spring force is applied by the primary current instruction value PriSOL / I ^* from the shift control unit 12B of the controller 12, the operation signal pressure port 118b and the drain port 118c communicate with each other and the pilot pressure port 118a closes. To be

  The primary control valve 119 is a valve that uses the line pressure PL as a source pressure and regulates the primary pressure Ppri to the primary hydraulic chamber 23a, and has a line pressure port 119a, a primary pressure port 119b, and a drain port 119c. The spring force and the feedback pressure act on one end side of the valve spool 119d, and the actuation signal pressure from the primary solenoid valve 118 acts on the other end side. When there is no action signal pressure, the primary pressure port 119b and the drain port 119c communicate with each other by the spring force, and the line pressure port 119a is closed. On the other hand, when the operation signal pressure is applied, the line pressure port 119a and the primary pressure port 119b are in communication with each other. The primary pressure oil passage 120 is connected to the primary pressure port 119b.

[Valve abnormality diagnosis device]
Next, the valve abnormality diagnosis device according to the present embodiment will be described. In the present embodiment, the control valve that is the subject of abnormality diagnosis is the pressure regulator valve 111 that functions as a secondary control valve. Hereinafter, the control valve 111 or the valve 111 will be simply referred to.

  Although not shown, the control valve 111 has a spool inserted inside the valve bore. The control valve 111 appropriately adjusts the axial position of the spool so that a hydraulic pressure corresponding to a given command pressure (line pressure command value) is generated. That is, if the actual pressure (line actual pressure) is lower than the command pressure, the axial position of the spool is set to the position where the closing port 111b is applied to increase the actual pressure, and if the actual pressure is higher than the command pressure, the spool pressure is increased. The axial position is set to the position to which the drain port 111c is applied to reduce the actual pressure.

  In such a valve, the spool slides in the valve bore in the axial direction, so that wear occurs on the inner peripheral surface of the valve bore. When this wear occurs or progresses, the line pressure, that is, the hydraulic pressure in the secondary hydraulic chamber 23b cannot be properly adjusted. Therefore, the present abnormality diagnosis device diagnoses such an abnormality due to wear of the inner peripheral surface of the valve bore.

  As shown in FIG. 2, is the abnormality diagnosis device 100 in a state where the line pressure sensor (actual pressure detecting means) 44 for detecting the line actual pressure PL which is the generated line pressure and the valve bore of the control valve 111 are worn? It has a determination unit (determination means) 12c for determining whether or not.

  The determination unit 12c is one functional element of the shift control unit 12B, and is detected by the line pressure sensor 44 when a first instruction pressure lower than a preset predetermined instruction pressure region (predetermined pressure) is given. When the first condition that the actual pressure becomes higher than the first instruction pressure and the second instruction pressure that is higher than the predetermined instruction pressure region (predetermined pressure) are given, the actual pressure becomes the second pressure. When the second condition that the pressure is lower than the instructed pressure and the determination condition including both are satisfied, it is determined that the valve bore is in a worn state.

The determination unit 12c is provided with the following conditions (a) to (f) so that the determination can be properly made when determining the wear of the valve bore of the control valve 111, and all of these conditions are satisfied. Is a precondition, and if the precondition is satisfied, the wear is determined.
(A) The engine 1 is normal and the engine speed is equal to or higher than the idle speed.
(B) There is no abnormality in the controller system.
(C) The brake switch is off (the brake is not operated).
(D) The secondary pressure feedback region.
(E) The hydraulic control mode is the normal mode (not the fail-safe mode).
(F) The spin determination of the vehicle is not in progress.

  In addition, one of the judgment conditions when the precondition is satisfied is that the oil balance is in a controllable state. This is because if the oil amount balance cannot be controlled, the actual pressure may deviate from the indicated pressure even if the valve 111 is normal, so that the wear cannot be properly determined.

Here, the determination principle by the determination unit 12c will be described.
When the wear of the valve bore progresses and the gap between the inner surface of the valve bore and the outer surface of the spool expands, oil leaks between the valve bore and the spool even if the actual pressure is increased by using the closing port 111b. As a result, a situation occurs in which the actual pressure does not rise to the indicated pressure.

  Further, when the wear between the valve bores progresses and the gap between the inner surface of the valve bore and the outer surface of the spool expands, even if an attempt is made to reduce the actual pressure by using the drain port 111b, the supply side between the valve bore and the spool is reduced. There is a situation in which oil leakage occurs and the actual pressure does not drop to the indicated pressure.

  FIG. 4 is a diagram showing the characteristics of the actual pressure with respect to the indicated pressure in comparison between the normal state and the abnormal state of the control valve 111. FIG. 4A shows the case where the oil temperature is in the normal temperature range, and FIG. Indicates the case where the oil temperature is in the high temperature range. In FIGS. 4A and 4B, the solid line shows the characteristics of the normal valve (new valve) 111, and the broken line shows the characteristics of the worn valve (abnormal valve) 111. Further, the horizontal axis represents the command current value output to the solenoid of the control valve 111 corresponding to the command pressure, and the vertical axis represents the actual pressure. The lower the indicated pressure is, the higher the indicated current value is, and the higher the indicated pressure is, the lower the indicated current value is set.

  As shown in FIGS. 4A and 4B, in the case of the normal valve 111, when the indicated current value (indicated pressure) is changed, the actual pressure also changes with a certain slope or more, and the actual pressure becomes almost the indicated pressure. Will be equivalent. On the other hand, in the case of the worn valve 111, the change in the actual pressure is small even if the indicated current value (indicated pressure) is changed, and in particular, when the oil temperature is in the high temperature range as shown in FIG. The change in the actual pressure becomes extremely small with respect to the change in the current value (indicated pressure). It is considered that this is because when the oil temperature is high, the viscosity of the oil is reduced and the oil pressure leakage between the valve bore and the spool is further increased, and as a result, the influence of the change in the instruction pressure on the actual pressure adjustment is reduced.

  As described above, the characteristic of deviation of the worn valve 111 with respect to the indicated pressure varies depending on the oil temperature, but in a region where the indicated current value is low (that is, a region where the indicated pressure is high), the actual pressure (broken line) of the worn valve 111 is In the region where the indicated pressure value is lower than the indicated pressure (solid line) and the indicated current value is high (that is, where the indicated pressure is low), the actual pressure (broken line) of the worn valve 111 is higher than the indicated pressure (solid line).

That is, although there is a variation depending on the oil temperature, the magnitude of the actual pressure (broken line) of the worn valve 111 and the indicated pressure (solid line) are reversed in the intermediate region of the indicated current value (indicated pressure) (broken line and solid line). Intersects with). Therefore, if an intermediate command pressure region I _{1 to} I ₂ (predetermined command pressure region P _{1 to} P ₂ ) applicable to various oil temperatures is set, a command pressure higher than the predetermined command pressure region (command The actual pressure of the valve 111 is apparently lower for a lower current value, and the actual pressure of the valve 111 is apparent for an indicating pressure lower than a predetermined indicating pressure region (indicating current value is higher). If it is detected that it is extremely high, it can be estimated that the valve 111 is worn.

Therefore, when the first instruction pressure lower than the predetermined instruction pressure areas P _{1 to} P ₂ is given, the first condition is that the actual pressure becomes higher than the first instruction pressure, and the predetermined instruction pressure area is set. When the second instruction pressure higher than P _{1 to} P ₂ is given, the actual pressure becomes lower than the second instruction pressure as the second condition, and these first and second conditions are Is also provided as a determination condition for determining that the valve bore is worn.

  It should be noted that the determination of the first and second conditions as the AND condition is made in the case where the spool is temporarily fixed due to the inclusion of contaminants between the valve bore and the spool, and when the valve 111 is worn. This is to distinguish it from the case of doing.

  In other words, if contamination is caught between the valve bore and the spool and the spool temporarily opens and sticks, a state may occur in which the actual pressure does not rise to the indicated pressure, and the second condition may be satisfied. Further, if the contamination is caught between the valve bore and the spool and the spool is temporarily stuck or fixed at a small opening degree, a state in which the actual pressure does not decrease to the indicated pressure may occur and the first condition may be satisfied. . However, when the contamination is caught and the spool is temporarily fixed, only one of the first condition and the second condition is satisfied, but both are not satisfied. Therefore, if the first and second conditions are AND conditions, it can be reliably determined that the valve 111 is worn.

The first condition is that the actual pressure is higher than the first instruction pressure by a first predetermined differential pressure or more for a first predetermined time or more, and the second condition is that the actual pressure is higher than the second instruction pressure. It is assumed that the state in which the pressure is lower than the predetermined differential pressure by 2 or more continues for the second predetermined time or more.
In the present embodiment, the first predetermined differential pressure and the second predetermined differential pressure are set to the same value (predetermined differential pressure), and the first predetermined time and the second first predetermined time are set to the same value (predetermined time). Is set to.
The predetermined differential pressure and the predetermined time are set to the magnitudes required to distinguish the case where the valve 111 is normal and the case where the valve 111 is abnormal.

  Further, in the present embodiment, if the first condition and the second condition are respectively determined once in one trip in which the key switch of the vehicle is continuously turned on, it is determined that the valve bore is worn. However, for example, when the first condition and the second condition are respectively determined a plurality of times (for example, twice), it may be determined that the valve bore is worn. By making a condition that a plurality of first and second conditions are respectively judged in one trip, the judgment accuracy can be improved.

  However, in a transient state when the instruction pressure is changed to a high value or a low value, it takes time for the actual pressure to reach the instruction pressure due to the response delay of the control valve 111 even if the control valve 111 is normal. The state in which the actual pressure and the indicated pressure are different from each other temporarily occurs. For example, FIG. 5 is a time chart showing a change between the actual pressure and the instruction pressure immediately after the accelerator is stepped back from on to off in the normal state of the valve 111. As shown in FIG. 5, when the accelerator is turned off, the engine load decreases and the instruction pressure decreases accordingly. However, due to the response delay, the decrease in the actual pressure is delayed and the actual pressure and the instruction pressure decrease. Diverge.

  Therefore, in such a case, in order to prevent the valve bore from being erroneously determined to be worn, a steady state in which the indicated pressure is stable and a transient state in which the indicated pressure fluctuates are the first condition and the second condition. The specified differential pressure and the specified time required for are set separately. That is, the predetermined differential pressure in the transient state is set to be larger than the predetermined differential pressure in the steady state, and the predetermined differential pressure in the transient state becomes larger than the difference between the actual pressure and the command pressure due to the response delay of the control valve 111. I am trying.

For example, if the maximum value of the instruction pressure is about 6 MPa, in the steady state, the predetermined differential pressure is about 0.2 to 0.3 MPa, and the predetermined time is about 1 to 2 seconds, then the abnormality can be determined. . In the transient state, the abnormality can be determined by setting the predetermined differential pressure to about 1 to 3 MPa and the predetermined time to about 0.5 to 1 second. In the transient state, the predetermined time is set shorter than in the steady state, but in the transient state, it takes time for the difference between the actual pressure and the indicated pressure to converge, so it is mainly determined by making the predetermined differential pressure sufficiently large. This is because
Further, as another determination method, it is possible to detect that the feedback control of the hydraulic pressure is in a divergent state and determine whether the valve bore is in a worn state. In the case of this method, if the deviation between the actual pressure and the indicated pressure is large, the divergence state can be detected in a short time, so the wear of the valve bore can also be determined in a short time.

[Action and effect]
Since the valve abnormality diagnosing device according to the present embodiment is configured as described above, it is possible to perform the valve 111 abnormality diagnosis as shown in the flowchart of FIG. 6, for example.
The process of the flowchart shown in FIG. 6 starts when the key switch of the vehicle is set to ON, is repeatedly executed at a predetermined cycle, and ends when the key switch is turned OFF.

  In the abnormality diagnosis of the valve 111, first, it is determined whether or not the above-described preconditions are satisfied, that is, whether or not all of the conditions (a) to (f) are satisfied. Here, it is also determined that the oil amount balance can be controlled by including it in the prerequisite (step S10). If the precondition is not satisfied, it is determined whether or not the key switch has been turned off (step S110). If the key switch has not been turned off, the processing of this cycle ends. When the key switch is turned off, both flags F1 and F2, which will be described later, are reset to 0 (step S120), and the diagnosis ends.

  When the precondition is satisfied, the first judgment routine for judging whether or not the above-mentioned first condition is satisfied is executed (step S20). In the first determination routine, a predetermined differential pressure and a predetermined time are selected according to whether the instruction pressure is in a steady state or a transient state, and the determination is performed. Then, it is determined whether or not the first condition is satisfied in the first determination routine (step S30), and when it is determined that the first condition is satisfied, the first determination flag F1 is set to 1 (step S40). ). The first determination flag F1 is set to 1 when the first condition is satisfied, and is set to 0 when the first condition is not satisfied.

  On the other hand, if it is not determined that the first condition is satisfied, the second determination routine that determines whether or not the second condition is satisfied is executed (step S50). Also in this second determination routine, the determination is performed by selecting the predetermined differential pressure and the predetermined time depending on whether the instruction pressure is in the steady state or the transient state. Then, it is determined whether or not the second condition is satisfied in the second determination routine (step S60), and when it is determined that the second condition is satisfied, the second determination flag F2 is set to 1 (step S70). ). The second determination flag FD2 is set to 1 when the second condition is satisfied, and is set to 0 when the second condition is not satisfied.

When it is not determined that the first condition is satisfied and the second condition is not satisfied, the process proceeds to step S110 and the same process as above is performed.
On the other hand, when it is determined that the first condition or the second condition is satisfied, it is determined whether the first determination flag F1 and the second determination flag F2 are both 1 (step S80). If both the first determination flag F1 and the second determination flag F2 are not 1, the process proceeds to step S110 and the same process as above is performed.

  If it is determined that the first condition is satisfied and the second condition is satisfied within one trip, it is determined that both the first determination flag F1 and the second determination flag F2 are 1 in step S80. The abnormality of the control valve 111 (wear of the valve bore) is determined (step S90). In this case, the abnormality of the valve 111 is displayed in the vehicle (step S100), and the corresponding processing such as valve replacement is prompted. Further, the controller 12 implements control for limiting the output torque of the engine 1 in order to protect the variator.

  In this way, when the first instruction pressure lower than the predetermined instruction pressure area is applied, the actual pressure becomes higher than the first instruction pressure, and the first instruction pressure area is lower than the first instruction pressure area. If the second condition, which is that the actual pressure becomes lower than the second indicated pressure when a high second indicated pressure is given, satisfies the determination condition including that both are satisfied, the valve bore is worn. Since it is determined that the control valve is in the opened state, erroneous detection can be suppressed and unnecessary control valve replacement can be prevented.

In addition, since the first condition and the second condition are such that the actual pressure and the indicated pressure deviate from each other by a predetermined differential pressure or more for a predetermined time or more, an erroneous determination due to the influence of signal noise or valve operation delay, etc. Therefore, it is possible to accurately determine that the valve bore is in a worn state.
Especially in the transient state where the indicated pressure fluctuates, the predetermined differential pressure is set to a value larger than that in the steady state where the indicated pressure is stable, so erroneous determination in the transient state is suppressed. You can

Further, since it is determined whether or not the determination condition is satisfied within one trip in which the key switch of the vehicle continues to be on, it is possible to suppress erroneous determination. That is, it is rare that the contamination is caught and the spool is temporarily fixed. However, the contamination state in which the first condition is satisfied and the contamination state in which the second condition is satisfied are generated. It is considered that and do not occur together in one trip. Therefore, only one of the determination conditions is satisfied, but both are not satisfied. Therefore, by limiting within one trip and determining whether the first and second determination conditions are satisfied, it is possible to prevent erroneous determination that the valve bore is in a worn state when the contamination is caught. It
In order to further suppress such an erroneous determination, it may be determined whether or not the two determination conditions are satisfied within one trip and within a predetermined time or period.

[Other]
Although the embodiments have been described above, the present invention can be widely applied to any control valve for a hydraulic device for a vehicle having a spool inserted in the valve bore, and as the hydraulic device for a vehicle, a continuously variable vehicle for the vehicle can be used. It is not limited to the transmission.
The drive source of the vehicle is not limited to the engine and may be an electric motor or an engine and an electric motor.

  In the present embodiment, the “predetermined pressure” that defines the first condition and the second condition is defined as the “predetermined indicated pressure region”, but more simply, the “predetermined indicated pressure” is used. It can also be pinpointed.

1 Engine as a Driving Source of Vehicle 4 Continuously Variable Transmission for Vehicle as Hydraulic Equipment for Vehicle 12 Controller (ECU)
12c Judgment part 21 Primary pulley 22 Secondary pulley 23 Belt 44 Line pressure sensor 100 as actual pressure detection means 100 Abnormality diagnosis device 111 Control valve

Claims (7)

Having a spool inserted in the valve bore, adjusting the axial position of the spool so as to generate a hydraulic pressure according to the indicated pressure, and diagnosing abnormality due to wear of the valve bore of the control valve of the hydraulic equipment for vehicle. A valve abnormality diagnostic device,
An actual pressure detecting means for detecting the actual pressure that is the generated hydraulic pressure;
A first condition that the actual pressure becomes higher than the first instruction pressure when a first instruction pressure lower than a preset predetermined pressure is applied, and a first condition that is higher than the predetermined pressure. When a second condition, which is that the actual pressure becomes lower than the second command pressure when a command pressure of 2 is given, is satisfied, the valve bore becomes An abnormality diagnosis device for a valve, comprising: a determining unit that determines that the valve is worn. The first condition includes that the state in which the actual pressure is higher than the first instruction pressure by a first predetermined differential pressure or more continues for a first predetermined time or more,
The second condition includes that the state in which the actual pressure is lower than the second instruction pressure by a second predetermined differential pressure or more has continued for a second predetermined time or more. Valve abnormality diagnosis device. The first predetermined pressure difference and the second predetermined pressure difference are the first instruction pressure or the second instruction pressure in a transient state in which the first instruction pressure or the second instruction pressure fluctuates. 3. The valve abnormality diagnosing device according to claim 2, wherein the value is set to a value larger than that in the steady state where the pressure is stable. 4. The valve according to claim 1, wherein the determination condition is that the first condition and the second condition are both satisfied a plurality of times within a predetermined period. Abnormality diagnosis device. The valve abnormality diagnosis according to any one of claims 1 to 4, wherein the determination means determines the determination condition within one trip in which a vehicle key switch is continuously turned on. apparatus. The hydraulic device for a vehicle is a continuously variable transmission for a vehicle having two pulleys and a belt spanning the pulleys,
The valve abnormality diagnosis device according to claim 1, wherein the control valve controls a belt gripping hydraulic pressure of the pulley. The predetermined pressure has a first predetermined pressure and a second predetermined pressure higher than the first predetermined pressure,
The first condition that the actual pressure becomes higher than the first instruction pressure when the first instruction pressure lower than the first predetermined pressure is applied, The second condition that the actual pressure becomes lower than the second instruction pressure when the second instruction pressure higher than the second predetermined pressure is given is satisfied. The valve abnormality diagnosis device according to claim 1, wherein if the determination condition including the above is satisfied, it is determined that the valve bore is in a worn state.

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