JP2012163337A - Inspection method of hydraulic controller for automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection method of a hydraulic controller for an automatic transmission capable of determining the contact state between a current controlling unit, which controls current for energizing electromagnetic hydraulic control means, and a heat dissipating member.SOLUTION: In an inspection method of a hydraulic controller for an automatic transmission, firstly a norm map is created showing the relationship between a command current value and a real hydraulic value (S101). Then, the temperature of a TCU is detected by using a thermistor, in a state that the TCU is generating current (S103). A heat sink for dissipating heat generated by the TCU is in contact with the TCU. When the heat generated by the TCU is dissipated to an outside through the heat sink, the contact state is determined to be normal between the TCU and the heat sink since the temperature of the TCU stabilizes within an acceptable measurement range (S104). At this point, data is collected for correcting the norm map (S105). However, if the heat generated by the TCU is not dissipated to the outside through the heat sink, the contact state is determined to be abnormal and the inspection is stopped due to the temperature of the TCU exceeding the acceptable measurement range.

Description

  The present invention relates to an inspection method for a hydraulic control device for an automatic transmission.

  2. Description of the Related Art There is known an automatic transmission that controls an output generated by an engine according to a driving state of a vehicle and transmits the output to driving wheels of the vehicle. In the automatic transmission, a shift for controlling the output of the engine is performed by selectively engaging or releasing a plurality of friction elements. The automatic transmission includes an electromagnetic hydraulic control valve that controls the pressure (hereinafter referred to as “hydraulic pressure”) of hydraulic oil supplied to a plurality of friction elements, and an electromagnetic hydraulic control valve that controls an electric current supplied to the electromagnetic hydraulic control valve. And a current control unit for controlling the hydraulic pressure supplied by the motor. The current control unit converts the value of the command oil pressure calculated as the oil pressure required according to the driving state of the vehicle (hereinafter referred to as “command oil pressure value”) into the value of the current that flows through the electromagnetic oil pressure control valve. Outputs current to the hydraulic control valve. The electromagnetic hydraulic control valve is operated by the current output from the current control unit, and supplies hydraulic pressure to the friction element.

  Here, the magnitude of the shift shock that occurs when the vehicle shift range is changed includes the command hydraulic pressure value calculated by the current control unit and the hydraulic pressure value that the electromagnetic hydraulic control valve supplies to the friction element of the automatic transmission. The relationship with a certain actual oil pressure value affects. That is, if one actual oil pressure value corresponds to one command oil pressure value, the shift shock can be reduced. If a plurality of actual oil pressure values correspond to one command oil pressure value, the shift shock is growing. The relationship between the command hydraulic pressure value and the actual hydraulic pressure value is due to the accuracy of the current output from the current control unit and the accuracy of the hydraulic pressure output from the electromagnetic hydraulic control valve. Therefore, in order to improve the accuracy of the hydraulic pressure supplied by the electromagnetic hydraulic control valve, it is necessary to improve the accuracy of the current output from the current control unit.

  In Patent Document 1, an actual hydraulic pressure value output from an electromagnetic hydraulic control valve with respect to a command hydraulic pressure value in a current control unit is measured, and a difference between the command hydraulic pressure value and the actual hydraulic pressure value is used as a correction value to correct the command hydraulic pressure value. A hydraulic control method is described. In Patent Document 2, in order to prevent the conversion characteristics from the command hydraulic pressure value to the current value output from the current control unit due to heat generation in the current control unit, heat is released by contacting the current control unit with the heat sink. A hydraulic control device for an automatic transmission is described. Thereby, the change of conversion characteristics can be made small.

JP 2001-116130 A US Pat. No. 7,073,410B2

  However, in the hydraulic pressure control method described in Patent Document 1, the relationship between the command hydraulic pressure value and the actual hydraulic pressure value changes when the temperature of the current control unit rises by applying current. Thereby, there is a possibility that the accuracy of the hydraulic pressure cannot be improved with the aforementioned correction value. Further, in the hydraulic control device for automatic transmission described in Patent Document 2, since it is not known whether the heat of the current control unit is sufficiently radiated by the heat radiating plate, the contact state between the current control unit and the heat radiating plate is abnormal. In such a case, the temperature of the current control unit rises. For this reason, there is a possibility that the current control unit cannot output the current according to the conversion characteristics.

  An object of the present invention is to provide an inspection method for a hydraulic control device for an automatic transmission that can determine a contact state between a current control unit that controls a current supplied to an electromagnetic hydraulic control means and a heat radiating member.

According to the first aspect of the invention, in the inspection method for the automatic transmission hydraulic control device, the contact state between the current control unit provided in the automatic transmission hydraulic control device and the heat dissipating member in contact with the current control unit is abnormal. It is determined whether or not.
A hydraulic control device for an automatic transmission to be inspected supplies hydraulic pressure to a plurality of friction elements that perform automatic gear shifting. The automatic transmission hydraulic pressure control means includes an electromagnetic hydraulic pressure control means for controlling the hydraulic pressure, and a current control unit for energizing the electromagnetic hydraulic pressure control means. In the current control unit, the current generating means generates the current supplied to the electrohydraulic control means as the actual current, and the current detecting means detects the actual current. The temperature of the current control unit is detected by temperature detection means. On the other hand, the current control unit is in contact with a heat radiating member that releases heat generated by the current control unit to the outside.

  The inspection method of the present invention includes a temperature detection stage for detecting the temperature of the current control unit, a comparison stage for comparing the temperature of the current control unit detected in the temperature detection stage with a temperature within a predetermined range, and a comparison in the comparison stage. A determination step of determining a contact state between the current control unit and the heat dissipation member based on the result. In the temperature detection stage, the temperature detection means detects the temperature of the current control unit in a state where the current generation means generates a current. Next, in the comparison stage, the detected temperature of the current control unit is compared with a temperature within a predetermined range. As a result of the comparison in the comparison stage, when the temperature of the current control unit is outside the predetermined range, it is determined in the determination stage that the contact state between the current control unit and the heat radiating member is abnormal. Here, when the contact state is “abnormal”, the heat generated in the current control unit is not released to the outside through the heat radiating member, and therefore the contact state when the temperature of the current control unit is not stable within a predetermined range. Point to. When the contact between the current control unit and the heat radiating member is abnormal, the heat generated in the current control unit is difficult to be released through the heat radiating member, so the heat that is not released remains in the current control unit, and the predetermined temperature range described above Over.

  On the other hand, when the temperature of the current control unit is within the predetermined range, it is determined that the heat generated in the current control unit is released to the outside through the heat radiating member and the contact state between the current control unit and the heat radiating member is normal. To do. Here, the “normal” contact state refers to a contact state when heat generated in the current control unit is released to the outside through the heat radiating member and the temperature of the current control unit is stabilized within a predetermined range. . Thereby, the contact state between the current control unit and the heat radiating member can be inspected from the temperature detected by the temperature detecting means, and the contact state can be determined.

According to the second aspect of the present invention, the current control unit of the automatic transmission hydraulic control device to be inspected is a current command means for instructing the current generation means to use the value of the current generated by the current generation means as a corrected current value. The command current value is corrected by comparing the command current value detected by the current detection means with the conversion means for converting the command oil pressure value to be output to the electromagnetic hydraulic control means into the command current value. Current correction means for correcting the current value is provided.
According to the third aspect of the present invention, the inspection method for the hydraulic control device for an automatic transmission includes a command hydraulic pressure change stage for changing the current command hydraulic pressure value to a specific command hydraulic pressure value, and an electromagnetic hydraulic pressure control means. An oil pressure value measuring step for measuring an actual oil pressure value that is an output oil pressure value.
In the inspection method of the present invention, when it is determined that the contact state between the current control unit and the heat radiating member is normal in the determination stage, the command hydraulic pressure value is changed in the command hydraulic pressure change stage, and the actual hydraulic pressure value is measured in the hydraulic pressure measurement stage. Measure.

  In the inspection method of the present invention, when the temperature of the current control unit detected by the temperature detection means is within a predetermined range, it is determined that the contact state between the current control unit and the heat radiating member is normal. This indicates that the heat generated in the current control unit is sufficiently released to the outside through the heat radiating member. When it is determined that the contact state between the current control unit and the heat radiating member is normal, the current control unit gradually changes the command oil pressure value and measures the actual oil pressure value. Thereby, data representing the relationship between the command hydraulic pressure value and the actual hydraulic pressure value can be acquired only when the contact state between the current control unit and the heat radiating member is normal.

  According to the fourth aspect of the invention, the inspection method for the hydraulic control device for an automatic transmission includes a map creation stage for creating a map representing the relationship between the command current value and the actual hydraulic pressure value, and an actual measurement measured by the hydraulic pressure measurement stage. And a hydraulic pressure correction stage for correcting the aforementioned map based on the relationship between the hydraulic pressure value and the command hydraulic pressure value.

  Data representing the relationship between the actual hydraulic pressure output from the electromagnetic hydraulic control means and the command current output from the conversion means of the current control unit is acquired in an environment where the electromagnetic hydraulic control means and the current control unit are actually used. . In actual use, the current control unit generates heat by outputting a current. At this time, when the heat dissipating member that releases the heat of the current control unit is normally in contact with the current control unit, the temperature of the current control unit is stabilized within a predetermined range. Thereby, the conversion characteristic from the command current value to the actual current value in the current control unit is stabilized, and one actual hydraulic pressure value corresponds to one command current value. On the other hand, when the contact state between the current control unit and the heat dissipation member is abnormal, the temperature of the current control unit is not stable. Therefore, since the conversion characteristic of the command current value in the current control unit into the actual hydraulic pressure value changes, a plurality of actual hydraulic pressure values correspond to one command current value.

  In the inspection method of the present invention, when a map representing the relationship between the command oil pressure value and the command current value is created, a reference oil pressure map representing the relationship between the command current value and the actual oil pressure value is first created in advance. Data for creating the reference hydraulic pressure map is acquired by averaging actual hydraulic pressure values actually measured for a plurality of electromagnetic hydraulic control means. Next, it is determined in a determination step whether or not the contact state between the current control unit and the heat radiating member is normal by detecting the temperature of the current control unit. When it is determined that the contact state between the current control unit and the heat radiating member is normal, the current control unit gradually changes the command oil pressure value to measure the actual oil pressure value, and the relationship between the command oil pressure value and the actual oil pressure value. Get data representing. Finally, in the oil pressure correction stage, the reference oil pressure map is corrected based on the relationship between the command oil pressure value and the actual oil pressure value. Thereby, only when the contact state between the current control unit and the heat radiating member is normal, a map in which the relationship between the command hydraulic pressure value and the command current value is corrected is created. Therefore, in the inspection method of the present invention, a map representing the relationship between the command hydraulic pressure value and the command current value in accordance with the actual use of the current control unit can be created. Further, the reference hydraulic pressure map created in the map creation stage is created by averaging actual hydraulic pressure values actually measured for a plurality of electromagnetic hydraulic control means as a stage before inspecting the automatic transmission hydraulic control device. Accordingly, the automatic transmission hydraulic control device can be inspected without creating a reference hydraulic pressure map in the subsequent inspection. Therefore, the measurement man-hours in the inspection can be reduced.

According to the invention described in claim 5, the temperature detecting means is installed in the vicinity of the current detecting means.
In the current control unit, the current detection means generates the largest amount of heat, and the temperature of the current control unit is determined by the heat generation amount of the current detection means. Therefore, by installing the temperature detection means in the vicinity of the current detection means, the temperature detection means is affected by the heat generated by the current detection means, and detects the temperature of the current control unit with high accuracy. Thereby, the contact state between the current control unit and the heat radiating member can be determined with high accuracy.
According to the sixth aspect of the present invention, the current detection means and the temperature detection means are mounted on one substrate. In the current control unit, the temperature of the substrate on which the current detection means that generates the largest amount of heat is easily raised. Since the substrate has the temperature detecting means, the temperature change of the current control unit can be accurately measured, and the contact state between the current control unit and the heat dissipation member can be determined with high accuracy.

It is a mimetic diagram of a vehicle provided with an automatic transmission including a current control unit which is an inspection object of one embodiment of the present invention. 1 is a schematic diagram of a hydraulic control device for an automatic transmission including a current control unit that is an inspection target of an embodiment of the present invention. It is a block diagram of the electronic control module containing the electric current control unit which is a test object of one Embodiment of this invention. It is a conceptual schematic diagram of the electric current control unit which is a test object of one Embodiment of this invention. It is a mimetic diagram of an inspection system used by one embodiment of the present invention. It is a flowchart explaining the procedure of one Embodiment of this invention. FIG. 3 is a relationship diagram between current and hydraulic pressure in an embodiment of the present invention. It is a relationship figure of the electric current and temperature in one Embodiment of this invention, and time. It is a related figure of oil pressure and electric current in one embodiment of the present invention, and time.

(This embodiment)
An inspection method for a hydraulic control apparatus for an automatic transmission according to an embodiment of the present invention will be described with reference to FIGS.
First, an automatic transmission hydraulic pressure control device to be inspected will be described.
FIG. 1 shows a state where an automatic transmission 2 including a hydraulic control device 100 for an automatic transmission is mounted on a vehicle. The automatic transmission 2 adjusts the output generated by the engine 1 from the shift range selected by the driver inputted by the shift lever 4 and transmits the adjusted output to the drive wheels 3 of the vehicle.

  FIG. 2 shows a connection relationship between the clutch 30 which is one of a plurality of friction elements included in the automatic transmission 2 and the hydraulic control apparatus 100 for the automatic transmission. The automatic transmission hydraulic control device 100 includes a linear solenoid valve 10, an electronic control module 20, and an oil pump 43, and supplies hydraulic oil to the clutch 30 to control engagement or release of the clutch 30.

  The clutch 30 functions as a friction element of the automatic transmission. Although an automatic transmission is usually composed of a plurality of clutches and brakes, only one clutch 30 is shown here for convenience. The clutch 30 includes a plurality of clutch disks 31 and 32 that are provided inside the automatic transmission and overlap in the axial direction. These clutch disks 31 and 32 are engaged.

  In the clutch 30, the shaft portion 33 is assembled so as to pass through the cylindrical base portion 34. The base portion 34 is provided with a disk-shaped bottom portion 34a extending outward in the radial direction, and the above-described clutch disks 31 and 32 are disposed inside an outer portion 34b that is an outer portion continuous to the bottom portion 34a. The base 34 supports a disc-shaped clutch piston 35 so as to be reciprocally movable in the axial direction. Here, a piston chamber 36 is formed between the clutch piston 35 and the bottom 34a.

  A disc-shaped locking portion 34c is formed at the end of the base portion 34 opposite to the bottom portion 34a. The locking portion 34c is located just inside the clutch disks 31 and 32 in the radial direction. A spring 37 is provided between the locking portion 34 c and the clutch piston 35. As a result, the clutch piston 35 is urged toward the bottom 34a.

  The above-described piston chamber 36 is supplied with hydraulic oil via an oil passage 33 a formed in the shaft portion 33. As a result, when the hydraulic pressure in the piston chamber 36 rises and the urging force of the spring 37 is overcome, the clutch piston 35 moves away from the bottom 34a. When the clutch piston 35 comes into contact with the clutch disk 31 and presses the clutch disk 31, the clutch disks 31 and 32 are engaged.

  The linear solenoid valve 10 supplies hydraulic oil to the clutch 30. Although a plurality of linear solenoid valves 10 are usually provided for a plurality of clutches, only one linear solenoid valve 10 is shown here corresponding to the clutch 30.

  The linear solenoid valve 10 of the automatic transmission hydraulic control device 100 includes a sleeve 11 and an electromagnetic force generator 12. The sleeve 11 is formed with a discharge port 11a, an output port 11b, a supply port 11c, and a self-regulating port 11d from the electromagnetic force generator 12 side.

  A supply pipe 41 is connected to the supply port 11c. The supply pipe 41 is a pipe that supplies hydraulic oil from the oil pan 42 to the linear solenoid valve 10, and an oil pump 43 is connected to the supply pipe 41. A discharge pipe 44 is connected to the discharge port 11a. The discharge pipe 44 discharges hydraulic oil from the linear solenoid valve 10 to the oil pan 42.

  An output pipe 45 is connected to the output port 11b. An oil passage 33 a formed in the shaft portion 33 of the clutch 30 is connected to the output pipe 45. As a result, the hydraulic oil is supplied from the output pipe 45 to the piston chamber 36 via the oil passage 33a. A branch pipe 46 is formed in the middle of the output pipe 45 so as to branch. The branch pipe 46 is connected to the self-pressure regulating port 11d.

  The sleeve 11 houses a hydraulic control spool 13 that can reciprocate in the axial direction. The hydraulic control spool 13 communicates with a predetermined port among the plurality of ports 11a to 11d described above by an axial displacement. Specifically, the supply port 11c and the output port 11b communicate with each other when displaced in a direction away from the electromagnetic force generator 12 (hereinafter referred to as “high pressure setting”). Further, when displaced in a direction approaching the electromagnetic force generation unit 12 (hereinafter referred to as “low pressure setting”), the output port 11b and the discharge port 11a communicate with each other. At the intermediate position, there is an overlap region where neither the supply port 11c nor the discharge port 11a communicates with the output port 11b.

  A return spring 14 is provided on the front end side of the hydraulic control spool 13, and the return spring 14 biases the hydraulic control spool 13 to a low pressure setting. Further, part of the hydraulic oil sent from the output port 11b to the clutch 30 is supplied to the self-pressure regulating port 11d through the branch pipe 46, and the hydraulic control spool 13 is set to a low pressure by the hydraulic pressure of the hydraulic oil from the output port 11b. Energize.

  The electromagnetic force generating unit 12 includes a movable unit 15, a fixed unit 16, a coil 17, a connector 18, and the like. The movable portion 15 is supported inside the cylindrical fixed portion 16 so as to be movable in the axial direction. The coil 17 is arranged around the fixed portion 16. Further, the electronic control module 20 is electrically connected via the connector 18.

  The electronic control module 20 includes a microcomputer and a circuit that generates a current for driving the linear solenoid valve 10. When a current output from the electronic control module 20 is applied to the coil 17, an electromagnetic attractive force acts on the movable portion 15. As a result, the movable portion 15 urges the hydraulic control spool 13 in a direction away from the electromagnetic force generating portion 12 via the rod-shaped connecting portion 19 supported by the fixed portion 16.

Next, the electronic control module 20 will be described with reference to FIG.
FIG. 3 schematically shows a configuration relating to the electrical connection of the electronic control module 20. The electronic control module 20 includes a base portion 21, a hydraulic connector portion 22, an external connector portion 23, and the like. The slider 51 of the range sensor 50 connected to the electronic control module 20 is provided so as to reciprocate with respect to the sensor housing 50. The sensor 52 detects the range of the automatic transmission based on the moving position of the slider 51. The rotation speed sensor 53 detects the rotation speed of the automatic transmission.

  The hydraulic connector portion 22 is electrically connected to a hydraulic sensor 26 that detects the hydraulic pressure of the automatic transmission and the linear solenoid valve 10. An ECU (electronic control unit) 28 and a power source 27 are electrically connected to the external connector unit 23. The ECU 28 communicates driving information such as vehicle speed and engine speed.

  A TCU 24 as a “current control unit” is mounted on the bottom surface side of the base portion 21 serving as a base of the electronic control module 20. The TCU 24 is embedded in the base portion 21 and installed so as to contact the heat radiating plate 25. The TCU 24 is connected to the power source 27 and the ECU 28 via the external connector unit 23. The TCU 24 is connected to the linear solenoid valve 10 and the hydraulic sensor 26 via the hydraulic connector portion 22. The TCU 24 is also electrically connected to the sensor 52 of the range sensor 50.

  The contact surface 255 of the heat sink 25 is in contact with the bottom surface 245 of the TCU 24. The heat radiating plate 25 is made of aluminum having high heat radiating performance. The heat sink 25 is fastened to the TCU 24 by bolts (not shown).

  FIG. 4 schematically shows the relationship between each means constituting the TCU 24. The TCU 24 includes a microcomputer 240, a switching circuit 241, a current detection resistor 242, a thermistor 243, and the like mounted on a substrate 244.

  The microcomputer 240 receives driving information such as the hydraulic pressure of the clutch 30 output from the hydraulic sensor 26, the shift range output from the range sensor 50, and the vehicle speed output from the ECU 28, and controls the hydraulic pressure supplied to the clutch 30. Determine the current value. Specifically, an optimal hydraulic pressure value is determined as a command hydraulic pressure value from various operation information, and the command hydraulic pressure value is converted into a current value. The converted current value (hereinafter referred to as “converted current value”) is corrected based on a current value (hereinafter referred to as “actual current value”) measured by a current detection resistor described later. The corrected current value (hereinafter referred to as “corrected current value”) is output to a switching circuit 241 described later. The microcomputer 240 corresponds to “conversion means”, “current correction means”, and “current command means” recited in the claims.

  The switching circuit 241 is electrically connected to the microcomputer 240. The switching circuit 241 receives the correction current value output from the microcomputer 240, adjusts the current supplied from the power supply 27 to the correction current value, and outputs it to the linear solenoid valve 10. The switching circuit 241 corresponds to “current generating means” recited in the claims.

  The current detection resistor 242 is electrically connected to the switching circuit 241. The current detection resistor 242 detects a current value output from the switching circuit 241 to the linear solenoid valve 10 as an actual current value. The detected actual current value is output to the microcomputer 240 that is electrically connected. The current detection resistor 242 corresponds to “current detection means” recited in the claims.

  The thermistor 243 is insulated and installed near the temperature detection resistor 242 mounted on the substrate 244. The thermistor 243 detects the temperature of the substrate 244. The thermistor 243 corresponds to “temperature detection means” recited in the claims.

Next, FIG. 5 schematically shows an inspection system 60 for inspecting the contact state between the TCU 24 and the heat sink 25 in the electronic control module 20. The inspection system 60 includes an oil pump 61, a hydraulic pressure measuring device 64, an inspection device 66, and the like.
In the inspection system 60, the electronic control module 20 is electrically connected to the inspection device 66 and the linear solenoid valve 10. The electronic control module 20 is installed on the temperature regulator 67 in order to reproduce the temperature environment around the electronic control module 20 when the vehicle is actually traveling. The electronic control module 20 outputs a current to the linear solenoid valve 10 in response to a hydraulic command from the inspection device 66. Further, the electronic control module 20 outputs the temperature of the TCU 24 detected by the thermistor 243 in the electronic control module 20 to the inspection device 66.

  The inspection device 66 is electrically connected to the amplifier 65 in addition to the electronic control module 20. The inspection device 66 and the electronic control module 20 are connected by, for example, CAN (controller area network) communication. The inspection device 66 records the temperature detected by the thermistor 243 installed in the electronic control module 20 and receives the measurement result of the hydraulic pressure generated by the hydraulic pressure measuring device 64 via the amplifier 65.

  The hydraulic pressure measuring device 64 includes a hydraulic pressure generating unit 641 that generates a hydraulic pressure and a hydraulic pressure measuring unit 642 that measures the hydraulic pressure generated by the hydraulic pressure generating unit 641. The hydraulic pressure generator 641 is configured by the linear solenoid valve 10. The hydraulic pressure measuring device 64 is electrically connected to the electronic control module 20. The oil pressure measuring device 64 is connected to the oil pump 61 via the oil pressure regulator 63. The oil pump 61 sucks the hydraulic oil from the storage tank 62 that stores the hydraulic oil and pumps it to the hydraulic pressure measuring device 64. A hydraulic pressure regulator 63 provided between the oil pump 61 and the hydraulic pressure measuring device 64 controls the hydraulic pressure sent to the hydraulic pressure measuring device 64. In the oil pressure measuring device 64, the oil pressure measuring unit 642 measures the value of the oil pressure generated by the oil pressure generating unit 641 based on the current output from the electronic control module 20. The value of the oil pressure measured by the oil pressure measuring device 64 is amplified by the amplifier 65, and the amplified measurement result is output to the inspection device 66. In the inspection device 66, a map showing the relationship between the command current value calculated by the TCU 24 and the hydraulic pressure value measured by the hydraulic pressure measuring device 64 is created.

(Function)
Next, an inspection method of the electronic control module 20 using the inspection system 60 having the above configuration will be described with reference to FIGS. FIG. 6 shows a flowchart of an inspection procedure of the electronic control module 20 provided in the automatic transmission hydraulic control apparatus 100.
In the first step (hereinafter, “step” is omitted, and simply indicated by the symbol S) 101, the inspection device 66 outputs an oil pressure value (hereinafter referred to as “command oil pressure value”) to be output to the oil pressure measuring instrument 64 to the electronic control module. 20 is output to the TCU 24. At this time, the inspection device 66 outputs a command for gradually increasing the hydraulic pressure value output from the hydraulic pressure measuring device 64 to the TCU 24. The TCU 24 converts the designated hydraulic pressure value and outputs an actual current value as a current value for energizing the hydraulic pressure measuring device 64. The inspection device 66 represents the relationship between the current value (hereinafter referred to as “command current value”) obtained by converting the designated hydraulic pressure value by the TCU 24 and the hydraulic pressure value (hereinafter referred to as “actual hydraulic pressure value”) output from the hydraulic pressure measuring device 64. Get the data. The above-described inspection is performed on a plurality of linear solenoid valves, and the actual hydraulic pressure values obtained are averaged to create a reference hydraulic pressure map as shown in FIG. At this time, since the temperature of the TCU 24 has not increased, the conversion characteristics between the command current value and the actual current value in the created reference hydraulic pressure map are not stable. Therefore, the conversion characteristics between the command current value and the actual hydraulic pressure value are not stable. The standard hydraulic pressure map corresponds to a “map” described in claims.

  After the creation of the reference hydraulic pressure map in S101 is completed, in S102, the inspection device 66 commands the hydraulic pressure value generated by the hydraulic pressure measuring device 64 to the TCU 24. In response to a command from the inspection device 66, the TCU 24 outputs an actual current to the hydraulic pressure measuring device 64. At this time, the command current value obtained by converting the oil pressure value commanded to the TCU 24 is constant as shown in FIG. The time T1 is the time when the inspection device 66 has instructed the hydraulic value output from the hydraulic pressure measuring device 64 to the TCU 24.

  In S103, the thermistor 243 detects the temperature of the TCU 24. The temperature of the TCU 24 detected by the thermistor 243 starts to rise from time T1 when the inspection device 66 instructs the TCU 24 as shown in FIG.

  In step S104, the temperature of the TCU 24 is compared with a temperature within a predetermined range, and it is determined whether the temperature is stable at the temperature within the predetermined range. When the contact state between the TCU 24 and the heat sink 25 is “normal”, the heat generated in the TCU 24 is released to the outside of the TCU 24 through the heat sink 25. Therefore, as indicated by a solid line A in FIG. 8B, the temperature of the TCU 24 remains within the allowable measurement range indicated by the alternate long and short dash line even when the hydraulic pressure measuring device 64 is continuously energized. However, when the contact state between the TCU 24 and the heat sink 25 is “abnormal”, the heat generated in the TCU 24 is not released through the heat sink 25. Therefore, as indicated by a broken line B in FIG. 8B, the temperature of the TCU 24 is higher than the allowable measurement range. When the temperature of the TCU 24 falls within the predetermined range, the process proceeds to S105. On the other hand, when the temperature of the TCU 24 does not fall within the predetermined range, the inspection is terminated.

  When it is determined that the temperature of the TCU 24 is stable within the measurement allowable range (determination in S104 is “Yes”), in S105, the inspection device 66 gradually changes the command hydraulic pressure value. Specifically, as shown in FIG. 9A, the command hydraulic pressure value for the TCU 24 is changed so as to gradually decrease from time T2 to time T3, constant from time T3 to time T4, and from time T4 to time T4. In T5, it changes so that it may become large gradually. At this time, the actual current value output from the TCU 24 to the hydraulic pressure measuring device 64 is changed so as to gradually increase from time T2 to time T3 as shown in FIG. 9B, and from time T3 to time T4. It is set to be constant and is changed so as to gradually decrease from time T4 to time T5. Accordingly, as shown in FIG. 9C, the actual hydraulic pressure value measured by the hydraulic pressure measuring device 64 gradually decreases from time T2 to time T3, becomes constant from time T3 to time T4, and starts from time T4. It gradually increases at time T5.

  In S106, the actual oil pressure value generated by the oil pressure measuring device 64 is measured. The measured actual hydraulic pressure value is amplified by the amplifier 65 and transmitted to the inspection device 66.

  In S107, the reference hydraulic pressure map is corrected based on the difference between the reference hydraulic pressure map created in S101 and the data indicating the relationship between the command hydraulic pressure value measured in S106 and the actual hydraulic pressure value.

(effect)
Next, the effect of the inspection method of the automatic transmission hydraulic control device 100 of this embodiment will be described.
(A) In the inspection method of this embodiment, it is determined whether to measure the hydraulic pressure of the hydraulic pressure measuring device 64 based on the temperature of the TCU 24 in the electronic control module 20. The temperature of the TCU 24 is detected by a thermistor 243 installed in the vicinity of the current detection resistor 242 in the TCU 24. Here, the temperature of the TCU 24 is determined by the contact state with the heat sink 25 in contact with the TCU 24. When the TCU 24 and the heat sink 25 are in normal contact, the heat generated in the TCU 24 is released to the outside of the TCU 24 through the heat sink 25. As a result, the temperature of the TCU 24 is stabilized within a measurement allowable range that is a predetermined temperature range. On the other hand, when the TCU 24 and the heat sink 25 are not in normal contact, the heat generated in the TCU 24 is not released through the heat sink 25. For this reason, the generated heat is stored in the TCU 24, and the temperature of the TCU 24 exceeds the upper limit of the allowable measurement range. Thereby, it is possible to determine whether or not the contact state between the TCU 24 and the heat sink 25 is normal based on the temperature of the TCU 24 detected by the thermistor 243.

  (B) When it is determined that the contact state between the TCU 24 and the heat radiating plate 25 is normal, the inspection device 66 records the hydraulic pressure generated by the hydraulic pressure measuring device 64, and based on the reference hydraulic pressure map, the command hydraulic pressure value and the command current Correct the relationship with the value. Thereby, only when the contact state between the TCU 24 and the heat sink 25 is normal, data indicating the relationship between the command hydraulic pressure value and the command current value can be acquired.

  (C) In the inspection method of the present embodiment, only when it is determined that the contact state between the TCU 24 and the heat sink 25 is normal, the command hydraulic pressure and the actual hydraulic pressure are corrected from the difference from the reference hydraulic pressure map. Since the actual transmission is mounted on the vehicle is a hydraulic control device for an automatic transmission in which the contact state between the TCU 24 and the heat sink 25 is normal, the correction of the command hydraulic pressure and the actual hydraulic pressure is actually used by the vehicle. It shows the relationship between the command oil pressure and the actual oil pressure in the state where Thereby, the map matched with the actual use of the current control unit can be created.

  (D) The thermistor 243 is installed on the substrate 244 of the TCU 24 on which the current detection resistor 242 that generates a large amount of heat is mounted. The thermistor 243 is installed in the vicinity of the current detection resistor 242. Thereby, the thermistor 243 can accurately detect the temperature of the TCU 24. Therefore, the contact state between the TCU 24 and the heat sink 25 can be inspected with high accuracy.

  (E) In the inspection method of the present embodiment, a reference hydraulic pressure map representing the relationship between the command current value and the actual hydraulic pressure value is created in advance as a stage before the inspection of the TCU 24. At this time, the hydraulic pressure is measured for a plurality of linear solenoid valves, and the data obtained is averaged to obtain the actual hydraulic pressure value data used in the reference hydraulic pressure map. Thus, when the hydraulic pressure is corrected for another linear solenoid valve after the reference hydraulic pressure map is created, the reference hydraulic pressure map can be used. Therefore, the measurement man-hours in the inspection can be reduced.

(Other embodiments)
(A) In the above-described embodiment, the thermistor is installed on the substrate in the vicinity of the current detection resistor. However, the installation location of the thermistor need not be limited to this. It may be installed on the same substrate away from the current detection resistor, or may be installed on a substrate different from the current detection resistor.

  (A) In the above-described embodiment, the current generating means for supplying a current to the linear solenoid valve is a switching circuit. However, the current generation means is not limited to this.

  (C) In the above-described embodiment, the current detection means for detecting the current output from the switching circuit is the current detection resistor. However, the current detection means need not be limited to this.

  (D) In the above-described embodiment, the temperature detection means for detecting the temperature of the current detection resistor is a thermistor. However, the temperature detection means is not limited to this.

  (E) In the above-described embodiment, the hydraulic pressure measuring device has one system for generating hydraulic pressure. However, the system for generating the hydraulic pressure is not limited to this. A plurality of systems may be connected to one electronic control module.

  As mentioned above, this invention is not limited to such embodiment, It can implement with a various form in the range which does not deviate from the summary.

DESCRIPTION OF SYMBOLS 1 ... Engine 2 ... Automatic transmission,
10: Linear solenoid valve (electro-hydraulic control means),
24 ... TCU (current control unit),
25 ... heat sink (heat dissipating member),
27 ・ ・ ・ Power source (current generating means),
100 ・ ・ ・ Hydraulic control device for automatic transmission,
240... Microcomputer (conversion means, current correction means, current command means),
241 ... Switching circuit (current generating means),
242 ... Current detection resistor (current detection means),
243 ... Thermistor (temperature detection means),
244: Substrate.

Claims (6)

Electromagnetic hydraulic control means for controlling the hydraulic pressure output to the plurality of friction elements of the automatic transmission;
In the automatic transmission, there is provided current generating means for generating current flowing through the electromagnetic hydraulic control means as actual current, and current detecting means for detecting the actual current value generated by the current generating means as actual current value. A current control unit to be arranged; and
Temperature detecting means for detecting the temperature of the current control unit;
A heat dissipating member that contacts the current control unit and releases heat generated by the current control unit to the outside;
An inspection method for a hydraulic control device for an automatic transmission comprising:
A temperature detecting step of detecting the temperature of the current control unit by the temperature detecting means in a state where the current generating means generates a current;
A comparison step of comparing the temperature of the current control unit detected in the temperature detection step with a temperature within a predetermined range;
A determination step of determining whether or not the contact state between the current control unit and the heat dissipation member is abnormal based on a comparison result in the comparison step;
A method for inspecting a hydraulic control device for an automatic transmission, comprising:   The current control unit commands a current command means that commands the current generation means as a corrected current value to be generated by the current generation means, and a command hydraulic pressure value that is a hydraulic pressure value to be output to the electromagnetic hydraulic control means. Conversion means for converting into a current value, and current correction means for comparing the command current value with the actual current value detected by the current detection means and the command current value to correct the command current value to the correction current value. An inspection method for a hydraulic control device for an automatic transmission according to claim 1. When determining that the contact state between the current control unit and the heat radiating member is normal in the determination step,
A command oil pressure change stage for changing the current command oil pressure value to a specific command oil pressure value;
A hydraulic pressure measurement step of measuring an actual hydraulic pressure value that is a hydraulic pressure value that is actually output by the electromagnetic hydraulic pressure control means;
The inspection method for a hydraulic control device for an automatic transmission according to claim 2, further comprising: An inspection method for a hydraulic control device for an automatic transmission according to claim 3,
A map creating stage for creating a map showing a relationship between the command current value and the actual hydraulic pressure value;
A hydraulic pressure correcting step for correcting the map based on a relationship between the actual hydraulic pressure value measured in the hydraulic pressure measuring step and the command hydraulic pressure value;
A method for inspecting a hydraulic control device for an automatic transmission, comprising:   5. The inspection method for a hydraulic control device for an automatic transmission according to claim 1, wherein the temperature detection unit is installed in the vicinity of the current detection unit. 6. In the inspection method of the hydraulic control device for automatic transmissions according to any one of claims 1 to 5,
An inspection method for a hydraulic control device for an automatic transmission, wherein the current detection means and the temperature detection means are mounted on a single substrate.

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