JP2016133133A - Hydraulic control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic control device which can determine whether or not an abnormality occurs even in a period other than a play reduction period.SOLUTION: A hydraulic control device 1 controls supply pressure being hydraulic pressure which is supplied to friction elements 5a to 5e. The friction elements 5a to 5e comprise pistons 7 which can reciprocate by the supply pressure, and first engagement plates 6a and second engagement plates 6b which are engaged with each other and released in the engagement by the movement of the pistons 7. Detection means 54a to 54b detect the contact of the pistons 7 and the first engagement plates 6a. First determination means determines whether or not a detection value of the supply pressure which is detected by hydraulic sensors 53a to 53b is smaller than a first threshold when the contact of the pistons 7 and the first engagement plates 6a is not detected by the detection means 54a to 54b. Therefore, in a period in which the contact of the pistons 7 and the first engagement plates 6a is not detected when the first engagement plates 6a and the second engagement plates 6b are engaged with each other, the presence or absence of an abnormality of the hydraulic control device can be determined.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hydraulic control device that controls the hydraulic pressure supplied to an automatic transmission for a vehicle, and more particularly, to a hydraulic control device that has an abnormality determining means.

Conventionally, a supply pressure, which is a hydraulic pressure supplied to a friction element of an automatic transmission for a vehicle, is detected by a supply pressure detecting means, and the opening of the solenoid valve is controlled based on the detected value of the supply pressure, whereby the supply pressure is reduced. 2. Description of the Related Art A hydraulic control device that regulates pressure is known (for example, see Patent Document 1).
By the way, in a hydraulic control apparatus having a supply pressure detection means, as a method for determining an abnormality from a detection value of a supply pressure, a device for determining the presence / absence of an abnormality from a detection value of a supply pressure during a backlash period of a friction element is known. (For example, refer to Patent Document 2).
Here, the backlash period of the friction element is formed by a filling phase in which a command value of a high supply pressure is temporarily given, and a standby phase in which a command value of a supply pressure lower than the filling phase is given following this filling phase. Yes.

However, since the hydraulic control device performs hydraulic control during periods other than the backlash period of the friction element, it cannot be said that it is sufficient to determine whether the backlash period is abnormal.
In addition, since the detected value of the supply pressure in the backlashing period of the friction element is oscillating and is likely to vary, after the temporary increase of the detected value of the supply pressure as shown in Patent Document 2, Careful attention is required to determine whether there is an abnormality from the degree of decrease.

JP 2004-205044 A Japanese Patent No. 4901716

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a hydraulic control device that can determine whether or not there is an abnormality in a period other than the backlash period. is there.

According to the first aspect of the present invention, the hydraulic control device controls the supply pressure, which is the hydraulic pressure supplied to the friction element of the vehicle automatic transmission.
Here, the friction element includes a piston that can be moved by the supply pressure, a return spring that presses the piston against the supply pressure, and a first engagement that is engaged or disengaged by the movement of the piston. A plywood and a second engagement plate are provided.
As the supply pressure increases, the piston is first driven to contact the first engagement plate, and the piston presses the first engagement plate to engage the first engagement plate and the second engagement plate.
The hydraulic control device includes an electromagnetic valve, a supply pressure command unit, a current command unit, a switch, a supply pressure detection unit, a detection unit, and a first determination unit, which will be described in detail below.

The electromagnetic valve has a movable body made of a magnetic body driven by magnetic flux generated by energization of the coil and a valve body driven by the movable body, and is a hydraulic pressure generated by a predetermined hydraulic pressure generation source. The original pressure is adjusted to the supply pressure by the movement of the valve body and output to the friction element.
The supply pressure command means calculates a command value for the supply pressure.
The current command means calculates a command value of the current flowing through the coil based on the command value of the supply pressure and outputs a control signal indicating the command value of the current.
The switch causes a current to flow through the coil in response to input of a control signal.
The supply pressure detecting means detects the supply pressure.
The detection means detects contact between the piston and the first engagement plate.
The first determination unit determines whether or not the detected value of the supply pressure detected by the supply pressure detection unit is smaller than the first threshold when the contact between the piston and the first engagement plate is not detected by the detection unit. .

Accordingly, the first threshold value can be used as a criterion for abnormality determination during a period in which contact between the piston and the first engagement plate is not detected when the first engagement plate and the second engagement plate are engaged.
For this reason, it is possible to determine whether or not there is an abnormality in the hydraulic control device during a period in which contact between the piston and the first engagement plate is not detected when the first engagement plate and the second engagement plate are engaged.

According to the second aspect of the present invention, the hydraulic control device controls a supply pressure, which is a hydraulic pressure supplied to the friction element of the vehicle automatic transmission.
Here, the friction element includes a piston that can be moved by the supply pressure, a return spring that presses the piston against the supply pressure, and a first engagement that is engaged or disengaged by the movement of the piston. A plywood and a second engagement plate are provided.
As the supply pressure decreases, the piston is first pushed back by the return spring in contact with the first engagement plate, whereby the engagement between the first engagement plate and the second engagement plate is released, and the piston further moves. By doing so, the piston and the first engagement plate are separated.
The hydraulic control device includes an electromagnetic valve, supply pressure command means, current command means, switch, supply pressure detection means, detection means, and second determination means, which will be described in detail below.

The electromagnetic valve has a movable body made of a magnetic body driven by magnetic flux generated by energization of the coil and a valve body driven by the movable body, and is a hydraulic pressure generated by a predetermined hydraulic pressure generation source. The original pressure is adjusted to the supply pressure by the movement of the valve body and output to the friction element.
The supply pressure command means calculates a command value for the supply pressure.
The current command means calculates a command value of the current flowing through the coil based on the command value of the supply pressure, and outputs a control signal indicating the command value of this current.
The switch causes a current to flow through the coil in response to input of a control signal.
The supply pressure detecting means detects the supply pressure.
The detection means detects contact between the piston and the first engagement plate.
The second determination means determines whether or not the detected value of the supply pressure detected by the supply pressure detection means is greater than the second threshold when the detection means does not detect contact between the piston and the first engagement plate. .

Thereby, the second threshold value can be used as a criterion for abnormality determination during a period in which contact between the piston and the first engagement plate is not detected when the first engagement plate and the second engagement plate are disengaged.
For this reason, it is possible to determine whether or not there is an abnormality in the hydraulic control device in a period in which contact between the piston and the first engagement plate is not detected when the first engagement plate and the second engagement plate are disengaged.

According to the third aspect of the present invention, the hydraulic control device controls a supply pressure that is a hydraulic pressure supplied to a friction element of the automatic transmission for a vehicle.
Here, the friction element includes a piston that can be moved by the supply pressure, a return spring that presses the piston against the supply pressure, and a first engagement that is engaged or disengaged by the movement of the piston. A plywood and a second engagement plate.
As the supply pressure increases, the piston is first driven to contact the first engagement plate, and the piston presses the first engagement plate to engage the first engagement plate and the second engagement plate. .
The hydraulic control device includes an electromagnetic valve, a supply pressure command unit, a current command unit, a switch, a supply pressure detection unit, a detection unit, and a third determination unit, which will be described in detail below.

The electromagnetic valve has a movable body made of a magnetic body driven by magnetic flux generated by energization of the coil and a valve body driven by the movable body, and is a hydraulic pressure generated by a predetermined hydraulic pressure generation source. The original pressure is adjusted to the supply pressure by the movement of the valve body and output to the friction element.
The supply pressure command means calculates a command value for the supply pressure.
The current command means calculates a command value of the current flowing through the coil based on the command value of the supply pressure, and outputs a control signal indicating the command value of this current.
The switch causes a current to flow through the coil in response to input of a control signal.
The supply pressure detecting means detects the supply pressure.
The detection means detects contact between the piston and the first engagement plate.
The third determining means determines the transmission characteristics from the supply pressure command value to the supply pressure detection value by the supply pressure detection means when the detection means detects contact between the piston and the first engagement plate. The supply pressure is estimated based on a function approximated by a mathematical expression including a next delay, and it is determined whether or not the absolute value of the difference between the estimated value of the supply pressure and the detected value of the supply pressure is greater than a third threshold value. To do.

Thereby, the third threshold value can be used as a criterion for abnormality determination during a period in which contact between the piston and the first engagement plate is detected when the first engagement plate and the second engagement plate are engaged.
For this reason, it is possible to determine whether or not there is an abnormality in the hydraulic control device during a period in which contact between the piston and the first engagement plate is detected when the first engagement plate and the second engagement plate are engaged.

According to the fourth aspect of the present invention, the hydraulic control device controls the supply pressure, which is the hydraulic pressure supplied to the friction element of the vehicle automatic transmission.
Here, the friction element includes a piston that can be moved by the supply pressure, a return spring that presses the piston against the supply pressure, and a first engagement that is engaged or disengaged by the movement of the piston. A plywood and a second engagement plate.
As the supply pressure decreases, the piston is first pushed back by the return spring in contact with the first engagement plate, whereby the engagement between the first engagement plate and the second engagement plate is released, and the piston further moves. By doing so, the piston and the first engagement plate are separated.
The hydraulic control device includes an electromagnetic valve, a supply pressure command unit, a current command unit, a switch, a supply pressure detection unit, a detection unit, and a fourth determination unit, which will be described in detail below.

The electromagnetic valve has a movable body made of a magnetic body driven by magnetic flux generated by energization of the coil and a valve body driven by the movable body, and is a hydraulic pressure generated by a predetermined hydraulic pressure generation source. The original pressure is adjusted to the supply pressure by the movement of the valve body and output to the friction element.
The supply pressure command means calculates a command value for the supply pressure.
The current command means calculates a command value of the current flowing through the coil based on the command value of the supply pressure, and outputs a control signal indicating the command value of this current.
The switch causes a current to flow through the coil in response to input of a control signal.
The supply pressure detecting means detects the supply pressure.
The detection means detects contact between the piston and the first engagement plate.
The fourth determination means determines the transmission characteristic from the supply pressure command value to the supply pressure detection value by the supply pressure detection means when the contact between the piston and the first engagement plate is detected by the detection means. The hydraulic pressure is estimated based on a function approximated by a mathematical expression including the next delay, and it is determined whether or not the absolute value of the difference between the estimated value of the supply pressure and the detected value of the supply pressure is greater than a fourth threshold value. .

Accordingly, the fourth threshold value can be used as a criterion for abnormality determination during a period in which contact between the piston and the first engagement plate is detected when the first engagement plate and the second engagement plate are disengaged. .
For this reason, it is possible to determine whether or not there is an abnormality in the hydraulic control device during a period in which contact between the piston and the first engagement plate is detected when the first engagement plate and the second engagement plate are disengaged.

It is a block diagram of the automatic transmission for vehicles using a hydraulic control apparatus (Example). It is explanatory drawing of a switch (Example). It is explanatory drawing of the time change of the command value of supply pressure, and the detected value of supply pressure (Example).

  Hereinafter, modes for carrying out the invention will be described based on examples.

FIG. 1 shows an automatic transmission 2 for a vehicle using a hydraulic control apparatus 1 according to an embodiment of the present invention.
The hydraulic control device 1 controls the supply pressure supplied to the friction elements 5 a to 5 e of the vehicle automatic transmission 2.
Note that an idling stop system is employed in a vehicle on which the vehicle automatic transmission 2 is mounted.
The idling stop system controls the internal combustion engine (not shown) to stop when the shift range is in the forward travel range and the vehicle speed is a predetermined value or less.

The vehicle automatic transmission 2 shifts a torque converter (not shown) connected to a crankshaft (not shown) of an internal combustion engine, a planetary gear type transmission mechanism (not shown), and a transmission mechanism. 1 is a stepped transmission including the hydraulic friction elements 5a to 5e and the hydraulic control device 1.
The speed change mechanism has a plurality of planetary gears (not shown), and the friction elements 5a to 5e use the torque of a rotating element such as a sun gear, a carrier, or a ring gear included in the planetary gear as a rotating element of another planetary gear. Alternatively, it is transmitted to a transmission case or the like.

The friction elements 5a to 5e include a wet multi-plate clutch or a wet multi-plate brake having the first engagement plate 6a and the second engagement plate 6b. The vehicle automatic transmission 2 engages and disengages the friction elements 5a to 5e by engaging the first engagement plate 6a and the second engagement plate 6b, or the first engagement plate 6a and the second engagement plate 6b. Of the plurality of shift stages by switching the power transmission path between the turbine shaft (not shown) and the output shaft (not shown) of the torque converter. Either one is established.
Here, the friction elements 5a to 5e include a piston 7 that can be moved by the supply pressure, and a return spring 8 that presses the piston 7 against the supply pressure, and the first engagement plate is moved by the movement of the piston 7. 6a and the second engagement plate 6b are engaged or disengaged.

The hydraulic pressure control device 1 includes a hydraulic pressure supply device 1 a as a “hydraulic pressure generation source” for supplying hydraulic pressure to each member constituting the vehicle automatic transmission 2.
The hydraulic pressure supply device 1a supplies hydraulic oil pumped up from the oil pan 9 to the pistons 7 and the torque converters of the friction elements 5a to 5e.
The hydraulic pressure supply device 1 a includes a mechanical pump 10 as a “pump”, an electric pump 11, a line pressure control valve 12 as a “pressure adjusting unit”, a manual valve 13, and the like.

The mechanical pump 10 is driven as the internal combustion engine rotates. The mechanical pump 10 sucks the hydraulic oil stored in the oil pan 9 through the oil passage 14. The mechanical pump 10 pressurizes the hydraulic oil sucked from the suction port connected to the oil passage 14 in the mechanical pump 10 and discharges it to the oil passage 15 from the discharge port.
The oil passage 15 connects the discharge port of the mechanical pump 10 and the introduction port 13 a of the manual valve 13. The hydraulic oil discharged from the mechanical pump 10 passes through the oil passage 15 and is supplied to the inlet 13 a of the manual valve 13.
The check valve 16 provided in the oil passage 15 allows the flow of hydraulic oil from the mechanical pump 10 to the manual valve 13 and prohibits the flow of hydraulic oil from the manual valve 13 to the mechanical pump 10.

The electric pump 11 generates hydraulic pressure regardless of the internal combustion engine, and is driven by a motor that rotates when energized. The electric pump 11 sucks the hydraulic oil stored in the oil pan 9 through the oil passage 18. The electric pump 11 pressurizes the hydraulic oil sucked from the suction port connected to the oil passage 18 in the electric pump 11 and discharges the hydraulic oil to the oil passage 19 from the discharge port.
The oil passage 19 connects the discharge port of the electric pump 11 and the oil passage 15 on the manual valve 13 side from the check valve 16 of the oil passage 15. The hydraulic oil discharged from the electric pump 11 is supplied from the oil passage 19 through the oil passage 15 to the inlet 13 a of the manual valve 13.
The check valve 20 provided in the oil passage 19 allows the flow of hydraulic oil flowing from the electric pump 11 to the manual valve 13 and prohibits the flow of hydraulic oil from the manual valve 13 to the electric pump 11.
Note that both the mechanical pump 10 and the electric pump 11 have rotation speed detection means, and these rotation speeds are monitored by a TCU or the like.

The line pressure control valve 12 is a pilot-type pressure regulating valve, and is connected to a branch path 22 that branches from the check valve 16 of the oil path 15 from the mechanical pump 10 side. The line pressure control valve 12 adjusts the line pressure as “original pressure”, which is the hydraulic pressure supplied to the manual valve 13.
The spool of the line pressure control valve 12 receives a biasing force of the spring, a force received from the hydraulic oil in the shunt 22, and a force received from the hydraulic pressure controlled by the electromagnetic valve 23 controlled according to the load of the vehicle automatic transmission 2. The balance is moved to open and close the relief port 12a.

When the hydraulic pressure discharged from the mechanical pump 10 or the electric pump 11 is higher than the line pressure, excess hydraulic oil is returned to the oil pan 9 through the oil passage 25 from the relief port 12a.
The hydraulic oil discharged from the relief port 12b of the line pressure control valve 12 is supplied to a lockup circuit of the torque converter.
The line pressure is acquired as a “source pressure detection value” by the hydraulic sensor 26 that is the “source pressure detection means”, and the oil temperature of the hydraulic oil is acquired by the temperature sensor 27 that is the “oil temperature detection means”.
Further, a shunt 28 that further branches from the shunt 22 is provided, and this shunt 28 is connected to a lubricating portion that supplies hydraulic oil to each member as lubricating oil. A check valve 29 is provided in the shunt 28.

The select bar 30 is operated to, for example, four operation positions by the driver of the vehicle.
Here, the four operation positions are a D range for traveling forward, a P range for parking, an R range for traveling backward, and an N range for interrupting power transmission. The spool 13 b of the manual valve 13 is mechanically or electrically connected to the select bar 30 and operates according to the operation position of the select bar 30.

When the operation position of the select bar 30 is in the D range, the manual valve 13 causes the oil passage 15 and the forward oil passage 32 to communicate with each other, and the oil passage 15 and the reverse oil passage 33 are blocked. At this time, the hydraulic oil in the oil passage 15 and the oil passage 19 can be supplied to the electromagnetic valves 35b, 35c, and 35d corresponding to the forward friction elements 5b, 5c, and 5d through the forward oil passage 32.
The forward friction elements 5b, 5c, and 5d are friction elements that are supplied with hydraulic pressure through the forward oil passage 32 and are involved in the establishment of the forward shift speed.

When the operation position of the select bar 30 is in the R range, the manual valve 13 communicates the oil passage 15 and the reverse oil passage 33 and blocks the oil passage 15 and the forward oil passage 32. At this time, the hydraulic oil in the oil passage 15 and the oil passage 19 can be supplied to the electromagnetic valve 35e corresponding to the reverse friction element 5e through the reverse oil passage 33.
The reverse friction element 5 e is a friction element to which hydraulic pressure is supplied through the reverse oil passage 33.

When the operation position of the select bar 30 is in the P range or the N range, the manual valve 13 blocks the forward oil passage 32, the reverse oil passage 33, and the oil passage 15.
There is a friction element 5a to which hydraulic oil is directly supplied from the oil passage 15 without going through the manual valve 13. This friction element 5a is a wet multi-plate brake, and the operation position of the select bar 30 is in the D range. In some cases, the engine brake is applied by operating in cooperation with the friction element 5d which is a part of the forward friction element. Then, when the operating position of the select bar 30 is in the R range, it operates in cooperation with the reverse friction element 5e to form reverse (hereinafter, this friction element 5a may be referred to as a brake friction element). ).

Corresponding to the forward friction elements 5b, 5c, 5d, electromagnetic valves 35b, 35c, 35d are provided. Which of the forward friction elements 5b, 5c, 5d is engaged is determined for each of a plurality of forward shift speeds. An electromagnetic valve 35e is provided corresponding to the reverse friction element 5e, and an electromagnetic valve 35a is provided corresponding to the brake friction element 5a.
That is, electromagnetic valves 35a to 35e are provided through the oil passages 40a to 40e, respectively, for the plurality of friction elements 5a to 5e.

The solenoid valves 35a to 35e are spool valve type hydraulic control valves capable of continuously changing the output hydraulic pressure. The electromagnetic valves 35a to 35e have a movable body made of a magnetic body driven by magnetic flux generated along with energization of the coil and a valve body driven by the movable body, and the hydraulic pressure generated by the hydraulic pressure supply device 1a. Is adjusted to the supply pressure by the movement of the valve body and output to the friction elements 5a to 5e.
The electromagnetic valves 35a to 35e control the supply pressure, which is the output hydraulic pressure, by balancing the electromagnetic thrust corresponding to the current command value given from the TCU 50 and the static hydraulic pressure introduced from the output hydraulic pressure.
The electromagnetic valves 35 a to 35 e can adjust the pressure of the hydraulic oil supplied directly from the oil passage 15 or via the forward oil passage 32 or the reverse oil passage 33 from the manual valve 13 and can be supplied to the piston 7. .
The engagement and release of the friction elements 5a to 5e can be controlled by adjusting the supply pressure from the electromagnetic valves 35a to 35e.

The TCU 50 includes a supply pressure command unit 50a, a current command unit 50b, a switch 50c that drives the electromagnetic valves 35a to 35e, and the like.
In the vehicular automatic transmission 2, the friction elements 5a to 5e are changed according to a hydraulic pattern that is a predetermined pattern when the friction elements 5a to 5e are shifted.
Therefore, the supply pressure command means 50a calculates a command value of supply pressure to be given to the friction elements 5a to 5e based on this hydraulic pressure pattern.
Then, the current command means 50b applies the command value of the supply pressure to the current command characteristic, calculates the command value of the current flowing through the coil, and outputs a control signal indicating the command value of this current.

The switch 50c allows a current to flow through the coil in response to the input of a control signal, has an electric circuit including a switching element and the like, and supplies an actual current corresponding to the command value of the current from the current command means 50b to the solenoid valve 35a. ~ 35e. The switch 50c operates to supply an actual current to the solenoid valves 35a to 35e.
Note that the switch 50c corresponds to each of the electromagnetic valves 35a to 35e, and the TCU 50 gives different command values for the current to the driver 50c, that is, different current values to the electromagnetic valves 35a to 35e. Can do.

Here, the current command characteristic is a correlation between the command value of the current applied to each switch 50c and the command value of the hydraulic pressure, and is obtained for each of the friction elements 5a to 5e.
The current command characteristic in the initial state is created by detecting the command value of the current applied to the plurality of switches 50c and the oil pressure applied to the friction element, and using the detected oil pressure average value.

The oil passages 40a to 40e are provided with hydraulic pressure sensors 53a to 53e which are “supply pressure detecting means” for detecting the supply pressure.
The hydraulic sensors 53a to 53e also serve as detection means 54a to 54e that detect contact between the piston 7 and the first engagement plate 6a. In addition, the detection of the contact of the detection means 54a-54e is performed in TCU50.
Further, orifices 56a to 56e are provided in the respective oil passages 40a to 40e to restrict the oil passage cross-sectional area between the electromagnetic valves 35a to 35e and the hydraulic pressure sensors 53a to 53e.

Further, the detected value of the supply pressure acquired by the hydraulic sensors 53a to 53e is sent to the TCU 50.
The TCU 50 includes not only the detected value of the supply pressure but also the detected value of the original pressure acquired by the hydraulic sensor 26, the detected value of the oil temperature acquired by the temperature sensor 27, and the rotational speeds of the mechanical pump 10 and the electric pump 11. Etc. are also sent.
The TCU 50 not only gives current command values to the solenoid valves 35a to 35e but also sends control signals to various members constituting the vehicle automatic transmission 2 from various data to be acquired, and makes various judgments from various data. Or do.

A specific example of the switch 50c is shown in FIG.
The switch 50c includes a switching element 58a, a switching element 58b, and a detection resistor 59 as “current detection means” that detects a current flowing through the coil.
The collector terminal of the switching element 58a is connected to the battery, and the emitter terminal is connected to one end of the coil.
The collector terminal of the switching element 58 b is connected to the other end of the coil, and the emitter terminal is grounded via the detection resistor 59.
The switching element 58b is always on-controlled, and the switching element 58a is PWM-controlled by a control signal from the current command means 50b, thereby controlling the amount of current supplied to the coil.
The energization amount is controlled so as to realize a current command value by acquiring a detection value of the current flowing through the detection resistor 59 as a voltage value between the detection resistors 59.

Next, the first determination means to the fourth determination means will be described using a specific example of the temporal change in the oil pressure command value and the oil pressure detection value of the friction element shown in FIG.
For reference, FIG. 3 also shows relative time changes of the turbine speed and output torque.
FIG. 3 shows an engagement-side friction element (assumed to be a friction element 5b) that shifts from the open state to the engagement state, and an open-side friction element (friction element 5c) that shifts from the engagement state to the release state. Assuming)) is the hydraulic value.

In the friction element 5b that shifts from the open state to the engaged state, the piston 7 is first driven in contact with the first engagement plate 6a in response to an increase in supply pressure, and the piston 7 further presses the first engagement plate 6a. By doing so, the first engagement plate 6a and the second engagement plate 6b are engaged.
The contact between the piston 7 and the first engagement plate 6a is detected by the detection means 54b when the detected value of the hydraulic pressure exceeds a predetermined value (A in the figure).

The TCU 50, which is the “first determination unit”, detects that the detected value of the supply pressure detected by the hydraulic sensor 53b is less than the first threshold when the detection unit 54b does not detect the contact between the piston 7 and the first engagement plate 6a. It is determined whether or not it is small.
Further, the TCU 50 determines that an abnormality has occurred when a state where the detected value of the supply pressure is smaller than the first threshold value continues for a predetermined time.
Although an upper limit is set as the engagement-side normal determination range, setting of this upper limit is not always necessary.

In the friction element 5c that shifts from the engaged state to the released state, the first engagement plate 6a is first pushed back to the return spring 8 in a state where the piston 7 is in contact with the first engagement plate 6a in response to a decrease in the supply pressure. Is disengaged from the second engagement plate 6b, and the piston 7 is further moved to move the piston 7 away from the first engagement plate 6a.
Note that the separation between the piston 7 and the first engagement plate 6a is detected by the detection means 54c when the detected value of the hydraulic pressure falls below a predetermined value (B in the figure).

The TCU 50, which is the “second determination unit”, detects that the detected value of the supply pressure detected by the hydraulic sensor 53c is less than the second threshold when the detection unit 54c does not detect the contact between the piston 7 and the first engagement plate 6a. Determine whether it is larger.
Further, the TCU 50 determines that an abnormality has occurred when a state in which the detected value of the supply pressure is greater than the second threshold continues for a predetermined time.

Further, the TCU 50 that is the “third determination unit” uses the command value of the supply pressure when the contact between the piston 7 and the first engagement plate 6a is detected by the detection unit 54b in the friction element 5b on the engagement side. The supply pressure is estimated based on a function obtained by approximating the transfer characteristic reaching the hydraulic sensor 53b with a mathematical expression including dead time and first order lag, and the absolute value of the difference between the estimated supply pressure and the detected supply pressure is the first value. It is determined whether or not the threshold value is larger than 3.
In this case, the dead time and the time constant of the first-order lag change according to the detected value of the oil temperature detected by the temperature sensor 27, and the estimated value of the supply pressure is the original pressure acquired by the hydraulic sensor 26. When the detected value is exceeded, the estimated value of the supply pressure is used as the detected value of the original pressure.
Furthermore, the TCU 50 determines that an abnormality has occurred when a state where the absolute value of the difference is greater than the third threshold value continues for a predetermined time.

Further, the TCU 50 that is the “fourth determination unit” is configured to detect the hydraulic pressure from the command value of the supply pressure when the detection unit 54c detects the contact between the piston 7 and the first engagement plate 6a in the open friction element 5c. The supply pressure is estimated based on a function obtained by approximating the transfer characteristic reaching the sensor 53c with a mathematical expression including dead time and first order lag, and the absolute value of the difference between the estimated supply pressure value and the detected supply pressure value is the fourth value. It is determined whether it is larger than the threshold value.
In this case, the dead time and the time constant of the first-order lag change according to the detected value of the oil temperature detected by the temperature sensor 27, and the estimated value of the supply pressure is the original pressure acquired by the hydraulic sensor 26. When the detected value is exceeded, the estimated value of the supply pressure is used as the detected value of the original pressure.
Furthermore, the TCU 50 determines that an abnormality has occurred when a state where the absolute value of the difference is greater than the fourth threshold value continues for a predetermined time.

Note that FIG. 3 also shows the classification based on the command value of the supply pressure.
First, the friction element 5b on the engagement side starts from a non-shifting state in which an upper limit value or a lower limit value is given as a current command value to the electromagnetic valve 35b. Transition to a non-shifting state in which a lower limit value or an upper limit value is given as a command value of the solenoid valve 35b through a standby phase where a lower supply pressure command value is given and a hydraulic control phase accompanied by a monotonic increase in the supply pressure command value To do.
On the other hand, the friction element 5c on the open side, first, from the non-shifting state where the lower limit value or the upper limit value is given as the current command value to the solenoid valve 35c, After passing through a discharge phase accompanied by discharge, the solenoid valve 35c shifts to a non-shift state where an upper limit value or a lower limit value is given as a current command value.

That is, in the friction element 5b on the engagement side, the piston 7 and the first engagement plate 6a are not in contact in the filling phase and standby phase before A, and in the standby phase and hydraulic control phase after A, The first engagement plate 6a is in contact.
In the opening side friction element 5c, the piston 7 and the first engagement plate 6a are in contact in the hydraulic control phase and the discharge phase before B, and the piston 7 and the first engagement plate 6a in the discharge phase after B. Will not be in contact.

Furthermore, the hydraulic control device 1 includes the following fifth determination means.
When the TCU 50, which is the “fifth determination unit”, determines that there is an abnormality, the TCU 50 determines an abnormal location from the absolute value of the current difference between the current command value and the detected current value detected by the detection resistor 59.
The fifth determination unit determines that at least one of the valve body, the movable body, and the hydraulic pressure sensors 53a to 53e is abnormal when the absolute value of the current difference is equal to or smaller than the fifth threshold, and the absolute value of the current difference is When larger than the fifth threshold, it is determined that at least one of the switch 50c, the coil, and the connection wiring between the switch 50c and the coil is abnormal.

Furthermore, the hydraulic control device 1 includes the following sixth determination means.
The TCU 50 as the “sixth determination means” is a solenoid valve according to any one of the friction elements 5a to 5e in a non-shifting state in which an upper limit value or a lower limit value is given as a current command value to all the solenoid valves 35a to 35e. It is determined whether at least one of the connection wirings 35a to 35e, the switch 50c, the hydraulic pressure sensors 53a to 53e, and the switch 50c and the electromagnetic valves 35a to 35e is abnormal.
The TCU 50 compares the detected values of the supply pressures of the friction elements whose supply pressures are output from the solenoid valve to which the lower limit value is given among the friction elements 5a to 5e, and when there is a difference larger than the sixth threshold value, At least one of the solenoid valves 35a to 35e, the switch 50c, the hydraulic sensors 53a to 53e, and the connection wiring between the switch 50c and the solenoid valves 35a to 35e according to any of the friction elements that output the supply pressure from the solenoid valve to which the lower limit value is given. Judged to be abnormal.
And TCU50 compares the detected value of the supply pressure of the friction elements in which supply pressure is output from the solenoid valve to which upper limit value is given among friction elements 5a-5e, and there was a difference larger than the 7th threshold. In this case, the solenoid valves 35a to 35e, the switch 50c, the hydraulic sensors 53a to 53e, and the connection wiring of the switch 50c and the solenoid valves 35a to 35e according to any of the friction elements from which the supply pressure is output from the solenoid valve to which the upper limit value is given. It is determined that at least one is abnormal.

[Effects of Examples]
In the hydraulic control apparatus 1 according to the embodiment, as the supply pressure increases, the piston 7 is first driven to contact the first engagement plate 6a, and further, the piston 7 presses the first engagement plate 6a, thereby the first engagement plate. 6a and the second engagement plate 6b are engaged, the supply pressure detected by the hydraulic sensors 53a to 53e when the detection means 54a to 54e does not detect the contact between the piston 7 and the first engagement plate 6a. A TCU 50 is provided for determining whether the detected value is smaller than the first threshold value.
Accordingly, the first threshold value is used as a criterion for abnormality determination during a period in which contact between the piston 7 and the first engagement plate 6a is not detected when the first engagement plate 6a and the second engagement plate 6b are engaged. Can do.
For this reason, it is determined whether or not there is an abnormality in the hydraulic control device 1 during a period in which contact between the piston 7 and the first engagement plate 6a is not detected when the first engagement plate 6a and the second engagement plate 6b are engaged. it can.

Moreover, the hydraulic control apparatus 1 of an Example comprises the orifices 56a-56e which restrict | squeeze an oil path cross-sectional area between the solenoid valves 35a-35e and the hydraulic sensors 53a-53e.
Thereby, it is possible to suppress vibrations and variations in the detected value of the hydraulic pressure, and to set the first threshold value more appropriately.

In addition, the TCU 50 according to the embodiment determines that an abnormality occurs when a state where the detected value of the supply pressure is smaller than the first threshold value continues for a predetermined time.
As a result, even pulse noise or the like is not determined to be abnormal, and the accuracy of abnormality determination can be increased.

Further, according to the decrease in the supply pressure, the hydraulic control device 1 according to the embodiment first pushes the piston 7 back to the return spring 8 in a state where the piston 7 is in contact with the first engagement plate 6a, whereby the first engagement plate 6a and the second engagement plate 6 are engaged. When the engagement with the plywood 6b is released and the piston 7 moves and the piston 7 and the first engagement plate 6a are separated, the detection means 54a to 54e detect the contact between the piston 7 and the first engagement plate 6a. When not, a TCU 50 is provided to determine whether or not the detected value of the supply pressure detected by the hydraulic sensors 53a to 53e is greater than a second threshold value.
As a result, when the first engagement plate 6a and the second engagement plate 6b are disengaged, the second threshold value is used as a criterion for abnormality determination during a period in which contact between the piston 7 and the first engagement plate 6a is not detected. can do.
For this reason, the presence or absence of abnormality of the hydraulic control device 1 is determined in a period in which contact between the piston 7 and the first engagement plate 6a is not detected when the first engagement plate 6a and the second engagement plate 6b are disengaged. be able to.

In addition, the TCU 50 according to the embodiment determines that an abnormality occurs when a state where the detected value of the supply pressure is greater than the second threshold value continues for a predetermined time.
As a result, even pulse noise or the like is not determined to be abnormal, and the accuracy of abnormality determination can be increased.

  In the hydraulic control device 1 according to the embodiment, the piston 7 is first driven to come into contact with the first engagement plate 6a according to the increase of the supply pressure, and further, the piston 7 presses the first engagement plate 6a. When the engagement plate 6a and the second engagement plate 6b are engaged, when the contact between the piston 7 and the first engagement plate 6a is detected by the detection means 54a to 54e, the hydraulic pressure sensor 53a is determined from the command value of the supply pressure. The supply pressure is estimated based on a function obtained by approximating the transmission characteristic up to the supply pressure detection value of -53e with a mathematical expression including dead time and first-order lag, and the estimated supply pressure estimation value and the supply pressure detection value are estimated. The TCU 50 is provided for determining whether or not the absolute value of the difference between the two is larger than a third threshold value.

Thus, the third threshold value is used as a criterion for abnormality determination during a period in which contact between the piston 7 and the first engagement plate 6a is detected when the first engagement plate 6a and the second engagement plate 6b are engaged. be able to.
For this reason, the presence or absence of abnormality of the hydraulic control device 1 is determined in a period in which contact between the piston 7 and the first engagement plate 6a is detected when the first engagement plate 6a and the second engagement plate 6b are engaged. Can do.

Further, the TCU 50 according to the embodiment determines that an abnormality occurs when a state in which the absolute value of the difference is larger than the third threshold value continues for a predetermined time.
As a result, even pulse noise or the like is not determined to be abnormal, and the accuracy of abnormality determination can be increased.

  Further, according to the decrease in the supply pressure, the hydraulic control device 1 according to the embodiment first pushes the piston 7 back to the return spring 8 in a state where the piston 7 is in contact with the first engagement plate 6a, whereby the first engagement plate 6a and the second engagement plate 6 are engaged. When the engagement with the plywood 6b is released and the piston 7 moves and the piston 7 and the first engagement plate 6a are separated, the detection means 54a to 54e detect the contact between the piston 7 and the first engagement plate 6a. The supply pressure is estimated based on a function obtained by approximating the transfer characteristic from the supply pressure command value to the detection value of the supply pressure by the hydraulic sensors 53a to 53e by a mathematical expression including a dead time and a first-order lag, A TCU 50 is provided for determining whether the absolute value of the difference between the estimated value of the estimated supply pressure and the detected value of the supply pressure is greater than a fourth threshold value.

As a result, the fourth threshold value is set as a criterion for abnormality determination during a period in which contact between the piston 7 and the first engagement plate 6a is detected when the first engagement plate 6a and the second engagement plate 6b are disengaged. It can be.
Therefore, it is determined whether or not there is an abnormality in the hydraulic control device 1 during a period in which contact between the piston 7 and the first engagement plate 6a is detected when the first engagement plate 6a and the second engagement plate 6b are disengaged. can do.

Further, the TCU 50 according to the embodiment determines that an abnormality occurs when a state where the absolute value of the difference is greater than the fourth threshold value continues for a predetermined time.
As a result, even pulse noise or the like is not determined to be abnormal, and the accuracy of abnormality determination can be increased.

The hydraulic control apparatus 1 according to the embodiment includes a hydraulic sensor 26 that detects a source pressure. When the estimated value of the supply pressure exceeds the detected value of the source pressure acquired by the hydraulic sensor 26, the estimated value of the supply pressure is set. Use the detected value of the original pressure.
Thereby, since the solenoid valves 35a to 35e cannot output the supply pressure exceeding the original pressure, even if the estimated value of the supply pressure exceeds the detected value of the original pressure, the estimated value of the supply pressure is changed. It can be set appropriately, and the accuracy of abnormality determination can be increased.

Further, the hydraulic control device 1 of the embodiment includes a temperature sensor 27, and the dead time and the first-order lag time constant change according to the detected value of the oil temperature detected by the temperature sensor 27.
Thereby, the estimated value of supply pressure can be calculated | required appropriately according to oil temperature, and the precision of abnormality determination can be improved.

Further, when the TCU 50 according to the embodiment determines that an abnormality has occurred, the TCU 50 determines an abnormal location from the absolute value of the current difference between the current command value and the detected current value detected by the detection resistor 59.
When the absolute value of the current difference is equal to or smaller than the fifth threshold value, the TCU 50 determines that at least one of the valve body, the movable body, and the hydraulic pressure sensors 53a to 53e is abnormal, and the absolute value of the current difference is less than the fifth threshold value. When it is larger, it is determined that at least one of the switch 50c, the coil, and the connection wiring between the switch 50c and the coil is abnormal.
This makes it easy to identify an abnormal location.

Further, the TCU 50 according to the embodiment has the electromagnetic valves 35a to 35e related to any one of the friction elements 5a to 5e in a non-shifting state in which an upper limit value or a lower limit value is given as a current command value to all the electromagnetic valves 35a to 35e. The switch 50c, the hydraulic pressure sensors 53a to 53e, and at least one of the connection wirings between the switch 50c and the electromagnetic valves 35a to 35e are determined to be abnormal.
The TCU 50 compares the detected values of the supply pressures of the friction elements whose supply pressures are output from the solenoid valve to which the lower limit value is given among the friction elements 5a to 5e, and when there is a difference larger than the sixth threshold value, At least one of the electromagnetic valves 35a to 35e, the switch 50c, the hydraulic sensors 53a to 53e, the hydraulic sensors 53a to 53e, and the connection wiring between the switch 50c and the electromagnetic valves 35a to 35e, which are output from the electromagnetic valve to which the lower limit value is supplied, is abnormal. It is determined that
And TCU50 compares the detected value of the supply pressure of the friction elements in which supply pressure is output from the solenoid valve to which upper limit value is given among friction elements 5a-5e, and there was a difference larger than the 7th threshold. In this case, the solenoid valves 35a to 35e, the switch 50c, the hydraulic sensors 53a to 53e, and the connection wiring of the switch 50c and the solenoid valves 35a to 35e according to any of the friction elements from which the supply pressure is output from the solenoid valve to which the upper limit value is given. It is determined that at least one is abnormal.
Thereby, the presence or absence of abnormality of the hydraulic control apparatus 1 can be determined even in the non-shift state.

[Modification]
Various modifications can be considered for the present invention without departing from the gist thereof.
In the embodiment, the oil pressure sensors 53a to 53e are the detection means 54a to 54e, but the present invention is not limited to this mode. For example, as a detecting means, the contact between the piston 7 and the first engagement plate 6a may be detected from the stroke amount of the piston 7.

In the embodiment, the switch 50c has the switching elements 58a and 58b. However, the switching element 58b may be eliminated and the other end of the coil may be directly connected to the detection resistor 59. In this case, the number of switching elements can be reduced.
In the embodiment, the switch 50c constitutes a part of the TCU 50. However, the function may be separated from the TCU 50 and the solenoid valves 35a to 35e themselves may have the function.

In the embodiment, the detected value of the original pressure is directly acquired by the hydraulic sensor 26. However, the original pressure is not acquired directly, and the original pressure is supplied by the mechanical pump 10 or the electric pump 11 having the rotation speed detecting means. When the hydraulic pressure is adjusted by the line pressure control valve 12 or the like based on the command value of the original pressure, the rotational speed of the mechanical pump 10 or the electric pump 11, the detected value of the oil temperature detected by the temperature sensor 27, The estimated value of the source pressure may be calculated based on the command value of the source pressure.
In this case, when the estimated value of the source pressure exceeds the estimated value of the supply pressure, the estimated value of the supply pressure is set as the estimated value of the source pressure.
Thereby, even when the estimated value of the supply pressure exceeds the estimated value of the original pressure, the estimated value of the supply pressure can be set appropriately, and the accuracy of the abnormality determination can be increased.

DESCRIPTION OF SYMBOLS 1 Hydraulic control apparatus 1a Hydraulic supply apparatus (hydraulic pressure generation source) 2 Automatic transmission 5a-5e for vehicles Friction element 6a 1st engaging plate 6b 2nd engaging plate 7 Piston
8 Return spring 35a-35e Solenoid valve 50 TCU (1st determination means)
50a Supply pressure command means 50b Current command means 50c Switch
53a to 53e Hydraulic pressure sensor (supply pressure detection means) 54a to 54e Detection means

Claims (14)

Controlling supply pressure, which is hydraulic pressure supplied to the friction elements (5a to 5e) of the vehicle automatic transmission (2),
The friction elements (5a to 5e) include a piston (7) movable by the supply pressure, a return spring (8) that presses the piston (7) against the supply pressure, and the piston (7). A first engagement plate (6a) and a second engagement plate (6b) that are engaged or disengaged by movement of
As the supply pressure increases, the piston (7) is first driven to contact the first engagement plate (6a), and further, the piston (7) presses the first engagement plate (6a). In the hydraulic control device (1) in which the first engagement plate (6a) and the second engagement plate (6b) are engaged,
An element having a movable body made of a magnetic body driven by a magnetic flux generated by energization of the coil and a valve body driven by the movable body and having a hydraulic pressure generated by a predetermined hydraulic pressure generation source (1a). A solenoid valve (35a-35e) that regulates the pressure to the supply pressure by the movement of the valve body and outputs it to the friction elements (5a-5e);
Supply pressure command means (50a) for calculating a command value of the supply pressure;
Based on the command value of the supply pressure, a current command means (50b) for calculating a command value of the current flowing through the coil and outputting a control signal indicating the command value of the current;
A switch (50c) for causing a current to flow through the coil in response to the input of the control signal;
Supply pressure detection means (53a to 53e) for detecting the supply pressure;
Detection means (54a to 54e) for detecting contact between the piston (7) and the first engagement plate (6a);
Detection of supply pressure detected by the supply pressure detection means (53a to 53e) when contact between the piston (7) and the first engagement plate (6a) is not detected by the detection means (54a to 54e) A hydraulic control device (1) comprising: first determination means (50) for determining whether or not a value is smaller than a first threshold value. In the hydraulic control device (1) according to claim 1,
An oil pressure control device (1) comprising an orifice (56a to 56e) for reducing an oil passage sectional area between the electromagnetic valve (35a to 35e) and the supply pressure detecting means (53a to 53e). In the hydraulic control device (1) according to claim 1 or 2,
The hydraulic control device (1), wherein the first determination means (50) determines that an abnormality occurs when a state where the detected value of the supply pressure is smaller than the first threshold value continues for a predetermined time. Controlling supply pressure, which is hydraulic pressure supplied to the friction elements (5a to 5e) of the vehicle automatic transmission (2),
The friction elements (5a to 5e) include a piston (7) movable by the supply pressure, a return spring (8) that presses the piston (7) against the supply pressure, and the piston (7). A first engagement plate (6a) and a second engagement plate (6b) that are engaged or disengaged by movement of
In response to the decrease in the supply pressure, first, the piston (7) is pushed back to the return spring (8) in contact with the first engagement plate (6a), whereby the first engagement plate (6a) and the In the hydraulic control device (1) in which the engagement with the second engagement plate (6b) is released and the piston (7) further moves to separate the piston (7) from the first engagement plate (6a).
An element having a movable body made of a magnetic body driven by a magnetic flux generated by energization of the coil and a valve body driven by the movable body and having a hydraulic pressure generated by a predetermined hydraulic pressure generation source (1a). A solenoid valve (35a-35e) that regulates the pressure to the supply pressure by the movement of the valve body and outputs it to the friction elements (5a-5e);
Supply pressure command means (50a) for calculating a command value of the supply pressure;
Based on the command value of the supply pressure, a current command means (50b) for calculating a command value of the current flowing through the coil and outputting a control signal indicating the command value of the current;
A switch (50c) for causing a current to flow through the coil in response to the input of the control signal;
Supply pressure detection means (53a to 53e) for detecting the supply pressure;
Detection means (54a to 54e) for detecting contact between the piston and the first engagement plate;
Detection of supply pressure detected by the supply pressure detection means (53a to 53e) when contact between the piston (7) and the first engagement plate (6a) is not detected by the detection means (54a to 54e) A hydraulic control device (1), comprising: second determination means (50) for determining whether or not the value is greater than a second threshold value. In the hydraulic control device (1) according to claim 4,
The hydraulic control device (1), wherein the second determination means (50) determines that an abnormality occurs when a state in which the detected value of the supply pressure is greater than the second threshold value continues for a predetermined time. Controlling supply pressure, which is hydraulic pressure supplied to the friction elements (5a to 5e) of the vehicle automatic transmission (2),
The friction elements (5a to 5e) include a piston (7) movable by the supply pressure, a return spring (8) that presses the piston (7) against the supply pressure, and the piston (7). A first engagement plate (6a) and a second engagement plate (6b) that are engaged or disengaged by movement of
As the supply pressure increases, the piston (7) is first driven to contact the first engagement plate (6a), and further, the piston (7) presses the first engagement plate (6a). In the hydraulic control device (1) in which the first engagement plate (6a) and the second engagement plate (6b) are engaged,
An element having a movable body made of a magnetic body driven by a magnetic flux generated by energization of the coil and a valve body driven by the movable body and having a hydraulic pressure generated by a predetermined hydraulic pressure generation source (1a). A solenoid valve (35a-35e) that regulates the pressure to the supply pressure by the movement of the valve body and outputs it to the friction elements (5a-5e);
Supply pressure command means (50a) for calculating a command value of the supply pressure;
Based on the command value of the supply pressure, a current command means (50b) for calculating a command value of the current flowing through the coil and outputting a control signal indicating the command value of the current;
A switch (50c) for causing a current to flow through the coil in response to the input of the control signal;
Supply pressure detection means (53a to 53e) for detecting the supply pressure;
Detection means (54a to 54e) for detecting contact between the piston (7) and the first engagement plate (6a);
When the contact between the piston (7) and the first engagement plate (6a) is detected by the detection means (54a to 54e), the supply pressure detection means (53a to 53e) from the command value of the supply pressure. The supply pressure is estimated based on a function obtained by approximating the transfer characteristic leading to the supply pressure detection value by a mathematical expression including dead time and first-order lag, and the estimated supply pressure estimate value and the supply pressure detection value A hydraulic control device (1) comprising: third determination means (50) for determining whether or not the absolute value of the difference is greater than a third threshold value. In the hydraulic control device (1) according to claim 6,
The hydraulic control device (1), wherein the third determining means (50) determines that an abnormality occurs when a state in which the absolute value of the difference is greater than the third threshold value continues for a predetermined time. Controlling supply pressure, which is hydraulic pressure supplied to the friction elements (5a to 5e) of the vehicle automatic transmission (2),
The friction elements (5a to 5e) include a piston (7) movable by the supply pressure, a return spring (8) that presses the piston (7) against the supply pressure, and the piston (7). A first engagement plate (6a) and a second engagement plate (6b) that are engaged or disengaged by movement of
In response to the decrease in the supply pressure, first, the piston (7) is pushed back to the return spring (8) in contact with the first engagement plate (6a), whereby the first engagement plate (6a) and the In the hydraulic control device (1) in which the engagement with the second engagement plate (6b) is released and the piston (7) further moves to separate the piston (7) from the first engagement plate (6a).
An element having a movable body made of a magnetic body driven by a magnetic flux generated by energization of the coil and a valve body driven by the movable body and having a hydraulic pressure generated by a predetermined hydraulic pressure generation source (1a). A solenoid valve (35a-35e) that regulates the pressure to the supply pressure by the movement of the valve body and outputs it to the friction elements (5a-5e);
Supply pressure command means (50a) for calculating a command value of the supply pressure;
Based on the command value of the supply pressure, a current command means (50b) for calculating a command value of the current flowing through the coil and outputting a control signal indicating the command value of the current;
A switch (50c) for causing a current to flow through the coil in response to the input of the control signal;
Supply pressure detection means (53a to 53e) for detecting the supply pressure;
Detection means (54a to 54e) for detecting contact between the piston (7) and the first engagement plate (6a);
When the contact between the piston (7) and the first engagement plate (6a) is detected by the detection means (54a to 54e), the supply pressure detection means (53a to 53e) from the command value of the supply pressure. The hydraulic pressure is estimated based on a function obtained by approximating the transfer characteristic to the detected value of the supply pressure by a mathematical expression including dead time and first-order lag, and the difference between the estimated value of the estimated supply pressure and the detected value of the supply pressure And a fourth determination means (50) for determining whether or not the absolute value of the hydraulic pressure is greater than a fourth threshold value. In the hydraulic control device (1) according to claim 8,
The hydraulic control device (1), wherein the fourth determination means (50) determines that an abnormality occurs when a state in which the absolute value of the difference is greater than the fourth threshold value continues for a predetermined time. In the hydraulic control device (1) according to any one of claims 6 to 9,
A source pressure detecting means (26) for detecting the source pressure;
If the estimated value of the supply pressure exceeds the detected value of the original pressure acquired by the original pressure detecting means (26), the estimated value of the supplied pressure is used as the detected value of the original pressure. Device (1). In the hydraulic control device (1) according to any one of claims 6 to 9,
Oil temperature detecting means (27) for detecting the oil temperature is provided,
The original pressure is adjusted by the pressure adjusting means (12) based on the command value of the original pressure, with the hydraulic pressure supplied by the pump (10, 11) having the rotation speed detecting means,
Based on the rotational speed of the pumps (10, 11), the detected value of the oil temperature detected by the oil temperature detecting means (27), and the estimated value of the original pressure, the estimated value of the original pressure is calculated, When the estimated value of the supply pressure exceeds the estimated value of the original pressure, the estimated value of the supplied pressure is used as the estimated value of the original pressure. In the hydraulic control device (1) according to any one of claims 6 to 9,
Oil temperature detecting means (27) for detecting the oil temperature is provided,
The hydraulic control device (1) characterized in that the dead time and the time constant of the first-order lag are changed according to the detected value of the oil temperature detected by the oil temperature detecting means (27). In the hydraulic control device (1) according to claim 3, claim 5, claim 7 or claim 9,
Current detection means (59) for detecting current flowing in the coil;
A fifth determination means (50) for determining an abnormal location from an absolute value of a current difference between the current command value and the detected current value detected by the current detection means (59);
This fifth determination means (50)
When the absolute value of the current difference is less than or equal to a fifth threshold, it is determined that at least one of the valve body, the movable body, and the supply pressure detection means (53a to 53e) is abnormal,
When the absolute value of the current difference is larger than the fifth threshold value, it is determined that at least one of the switch (50c), the coil, the switch (50c), and the connection wiring of the coil is abnormal. Hydraulic control device (1) to perform. In the hydraulic control device (1) according to any one of claims 1 to 13,
There are a plurality of the friction elements (5a to 5e), and each of the plurality of friction elements (5a to 5e) includes the electromagnetic valve (35a to 35e), the switch (50c), and the supply pressure detection means (53a to 53e). )
Any of the plurality of friction elements (5a to 5e) in a non-shifting state in which an upper limit value or a lower limit value is given as a command value of the current to all of the plurality of solenoid valves (35a to 35e) The electromagnetic valves (35a to 35e), the switch (50c), the supply pressure detecting means (53a to 53e), the switch (50c) and the electromagnetic valves (35a to 35e) according to the friction elements (5a to 5e) Sixth determination means (50) for determining whether or not at least one of the connection wirings is abnormal,
The sixth determination means (50)
Among the plurality of friction elements (5a to 5e), the detected value of the supply pressure of the friction elements whose supply pressure is output from the solenoid valve to which the lower limit value is given is compared, and a difference larger than a sixth threshold value is found. If there is, the electromagnetic valve (35a to 35e), the switch (50c), the supply pressure detecting means (53a to 53e) according to any of the friction elements from which the supply pressure is output from the electromagnetic valve to which the lower limit value is given. ), Determining that at least one of the connection wires of the switch (50c) and the solenoid valves (35a to 35e) is abnormal,
Among the plurality of friction elements (5a to 5e), the detected value of the supply pressure of the friction elements whose supply pressure is output from the solenoid valve to which the upper limit value is given is compared, and a difference larger than a seventh threshold value is found. If there is, the solenoid valve (35a to 35e), the switch (50c), the supply pressure detection means (53a to 53e) according to any of the friction elements from which the supply pressure is output from the solenoid valve to which the upper limit value is given. ), And a hydraulic control device (1) characterized in that it is determined that at least one of the connection wires of the switch (50c) and the solenoid valves (35a to 35e) is abnormal.

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