JP2005042787A - Oil level adjusting method of automatic transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correctly adjust the oil level of an automatic transmission. <P>SOLUTION: An oil level adjusting method comprises a step (S120) of starting the oil level adjustment mode (S120) upon detection of short-circuit of a TC terminal (YES in S100) and detection of a special operation (S110), a step of starting the idling operation of an engine release of short-circuit of the TC terminal (YES in S130), a step (S150) of detecting the temperature of AT working fluid if the shift position is at the neutral position or the parking position (YES in S140), and a step (S170) of determining that the oil level is adjustable and lighting an indicator if the temperature of the AT working fluid is within a predetermined range (YES in S160). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to maintenance and inspection of an automobile equipped with an automatic transmission, and more particularly to maintenance and inspection of an oil level of an automatic transmission.
[0002]
[Prior art]
Many automobiles use an automatic transmission (AT) as a transmission. The automatic transmission is constituted by a torque converter and a gear-type transmission mechanism (which may be a continuously variable transmission, in which case, for example, a belt-type continuously variable transmission mechanism, not a gear-type transmission mechanism). The type transmission mechanism is filled with oil (AT hydraulic oil). If the amount of oil is less than the specified amount, the oil pump will not be able to inhale the oil at low temperatures, cornering or climbing, and the air will be sucked in, resulting in poor transmission of driving force and reduced driving force. There is a case.
[0003]
On the other hand, if the amount of oil is more than the specified amount, the oil is agitated by a rotating member such as a clutch drum of the gear type transmission mechanism when the oil level rises due to expansion, such as at high temperatures, and mechanical loss increases. In addition, the oil temperature is further raised, the durability of the automatic transmission is lowered, and the oil blowing from the breather is also led. Therefore, the amount of oil must always be kept appropriate.
[0004]
Such oil has a viscosity that changes depending on its temperature, and also expands to change its oil level. Therefore, when adjusting to an appropriate amount, it is necessary to appropriately set the oil temperature condition. Usually, it is often managed at a level corresponding to a temperature range of about 70 to 80 ° C., which is easily reached by general driving of an automobile and in which the oil circulation is easily stabilized. In addition, because it is difficult to raise the oil temperature to the above-mentioned temperature in the manufacturing factory of automobiles, a check level corresponding to the oil temperature obtained by measurement after the inspection process is separately set and managed. .
[0005]
In this way, although it takes a lot of man-hours at the manufacturing plant, it is possible to thoroughly manage the oil level. However, since oil deteriorates over time, it is also necessary for dealers to use oil for long periods of time. Will be exchanged. In this case, since there is no means for accurately controlling the oil temperature, for example, the vehicle is actually driven and the oil level is controlled after the internal temperature of the automatic transmission rises (the oil temperature also rises). It was.
[0006]
More specifically, after the vehicle is driven under a predetermined condition, for example, the oil amount is checked after running for 30 minutes at 60 km / h. If the automobile is run under these conditions, the internal temperature of the transmission is stabilized at about 70 to 80 ° C., so that an appropriate amount of oil can be injected in accordance with the conditions when oil is actually used.
[0007]
Injecting oil after actually driving the vehicle in this way is time consuming, cumbersome work, and is impossible because dealers do not have a course to do so. There was a problem. Japanese Patent Application Laid-Open No. 11-325235 (Patent Document 1) discloses an oil level detection and display method for an automatic transmission that does not require the vehicle to actually travel in view of such problems. This automatic transmission oil level detection display method is based on the fact that, in an automobile equipped with a failure diagnosis system in an AT controller, at least the engine is rotating at idling speed, the vehicle is stopped, and the position of the shift select lever A step of determining whether or not an automatic transmission oil level detection condition that the engine is in the N range or P range is satisfied, and displays on the AT controller that the automatic transmission oil level detection condition is satisfied Output step.
[0008]
According to this automatic transmission oil level detection display method, the engine is rotating at idling speed, the vehicle is stopped, and the position of the shift select lever is in the N range or P range. In this case, the operator is informed that the oil level detection operation can be performed. If the condition of the oil temperature is satisfied, the oil level can be detected. For this reason, the oil level detection operation can be performed without traveling in a manual pattern as conventionally performed. Therefore, an appropriate amount of oil can be injected even when the AT oil is exchanged at a dealer or the like that does not actually have a course to travel.
[0009]
[Patent Document 1]
JP 11-325235 A
[0010]
[Problems to be solved by the invention]
However, the automatic transmission oil level detection and display method disclosed in Patent Document 1 is equipped with a diagnosis function as a failure diagnosis system, and the diagnosis terminal of the AT controller is short-circuited to reduce the oil level of the automatic transmission. Different indications are displayed depending on whether the oil level may be detected or not suitable for detecting the oil level. Specifically, in order to display a failure diagnosis result diagnosed by a diagnosis function mounted on a vehicle as a failure diagnosis system and a vehicle state detected by various sensors, a monitoring device (for example, a liquid crystal display) outside the automobile is displayed. A diagnostic monitor coupler for connecting to a diagnostic monitor having a section is provided. By short-circuiting a specific terminal (diagnostic terminal) among the multiple terminals of this diagnostic monitor coupler, the diagnostic function is shifted from the normal mode to the fault diagnosis mode without using the diagnostic monitor, and the diagnosed fault details In response, the lamp on the meter panel of the automobile blinks in a predetermined pattern or the like.
[0011]
When an operator in a dealer or the like short-circuits such a diagnosis terminal, the mode shifts from the normal mode to the failure diagnosis mode, for example, ISC (Idle Speed Control system) control (engine speed control) executed by an engine ECU (Electronic Control Unit). The automatic control system for stabilizing the idle speed at the target idle speed stops. For this reason, the engine cannot rotate stably at idling speed. As a result, the oil may reach the required location and not be stable. In such a state, the oil amount of the automatic transmission cannot be adjusted appropriately.
[0012]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an automatic transmission oil level adjustment method capable of accurately checking the amount of hydraulic oil in an automatic transmission. Is to provide.
[0013]
[Means for Solving the Problems]
An oil level adjustment method according to a first aspect of the invention is an oil level adjustment method for an automatic transmission mounted on a vehicle having a self-diagnosis function. In this oil level adjustment method, a diagnostic mode transition step for shifting from the normal mode to the self-diagnosis mode by operating the output unit for outputting the result of the self-diagnosis function to the outside of the vehicle, and for shifting to the oil level adjustment mode An adjustment mode transition step for performing a predetermined operation at a predetermined time, a normal mode transition step for shifting from the self-diagnosis mode to the normal mode by operating the output unit after shifting to the oil level adjustment mode, and a state of the vehicle in advance In the predetermined state, a notification step of notifying the operator that the oil level can be adjusted is included.
[0014]
According to the first invention, in the diagnostic mode transition step, after once performing an operation such as short-circuiting a specific terminal of a diagnostic monitor coupler which is an output unit for outputting information to the diagnostic monitor, the adjustment mode transition step is entered. Then, a predetermined operation is performed to shift to the oil level adjustment mode. Thereafter, in a normal mode transition step, an operation such as releasing a short circuit from a specific terminal of the diagnostic monitor coupler is performed to bring the engine control state into a normal state. Thus, feedback control is performed so that the ISC functions normally and the engine speed becomes the target idle speed. In this state, that is, when the engine is rotating stably at idle rotation, if the vehicle state is a predetermined state in the notification step, the operator can adjust the oil level. To be notified. As a result, when the oil level is adjusted, the ISC functions to stabilize the engine speed. As a result, it is possible to provide an oil level detection method for an automatic transmission that can accurately check the amount of hydraulic oil in the automatic transmission.
[0015]
In addition to the configuration of the first invention, the oil level adjusting method according to the second invention executes engine idle speed control in the normal mode without executing engine idle speed control in the self-diagnosis mode. An oil level adjustment method for a vehicle in which engine control is performed.
[0016]
According to the second aspect of the invention, engine idle speed control is executed in the normal mode without engine idle speed control being executed in the self-diagnosis mode by engine control. As a result, when the oil level is adjusted, the ISC functions to stabilize the engine speed. As a result, it is possible to provide an oil level detection method for an automatic transmission that can accurately check the amount of hydraulic oil in the automatic transmission.
[0017]
In the oil level adjusting method according to the third aspect of the invention, in addition to the configuration of the second aspect of the invention, the engine control performs feedback control of idle speed control.
[0018]
According to the third aspect of the invention, engine idle speed control is executed in the normal mode without engine idle speed control being executed in the self-diagnosis mode by engine control. Thereby, when the oil level is adjusted, the feedback control of the idle speed control functions to stabilize the engine speed. As a result, it is possible to provide an oil level detection method for an automatic transmission that can accurately check the amount of hydraulic oil in the automatic transmission.
[0019]
In the oil level adjusting method according to the fourth aspect of the invention, in addition to the configuration of the second aspect of the invention, the engine control executes control for forcibly converging the idle speed to the target speed.
[0020]
According to the fourth aspect of the invention, engine idle speed control is executed in the normal mode without engine idle speed control being executed in the self-diagnosis mode by engine control. As a result, when the oil level is adjusted, the control for forcibly converging the idling engine speed to the target engine speed functions to stabilize the engine engine speed. As a result, it is possible to provide an oil level detection method for an automatic transmission that can accurately check the amount of hydraulic oil in the automatic transmission.
[0021]
In the oil level adjustment method according to the fifth aspect of the invention, in addition to the configuration of any one of the first to fourth aspects, the predetermined state is that the engine speed of the vehicle is within a predetermined range. In this state, the vehicle speed is in a predetermined range and the shift position of the transmission is in the neutral position or the parking position.
[0022]
According to the fifth aspect of the present invention, the vehicle engine speed is within a predetermined range, the vehicle speed is within a predetermined range, and the transmission shift position is a neutral position or a parking position. Since the oil level is suitable for the adjustment of the oil level, the operator is informed that the oil level can be adjusted based on these states.
[0023]
In the oil level adjustment method according to the sixth aspect of the invention, in addition to the configuration of any one of the first to fifth aspects, the notification step is capable of adjusting the oil level based on the temperature of the oil, A step of discriminating that the level cannot be adjusted and notifying the operator is included.
[0024]
According to the sixth aspect of the invention, the oil level cannot be accurately adjusted unless the oil temperature is an appropriate temperature. Therefore, the oil level can be adjusted only when the oil temperature is within a predetermined range. The operator can be notified that the oil level cannot be adjusted.
[0025]
In the oil level adjustment method according to the seventh aspect of the invention, in addition to the configuration of the sixth aspect of the invention, the notifying step indicates that the oil level cannot be adjusted because the oil temperature is higher than a predetermined range. A step of notifying a person.
[0026]
According to the seventh invention, depending on the outside air temperature, the oil temperature may become higher than the optimum temperature range for adjusting the oil level even at the engine idling speed. In such a case, it is necessary to stop the engine and leave it to decrease the temperature of the oil. In the notification step, the operator is informed that the oil level cannot be adjusted because the oil temperature is higher than the predetermined range. Therefore, the operator should reduce the oil temperature based on the notification. The engine can be stopped.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a power train of a vehicle including a control device according to an embodiment of the present invention will be described. The oil level adjustment method according to the present embodiment is realized by a program executed by ECU 1000 shown in FIG. In the present embodiment, the automatic transmission will be described as an automatic transmission having a planetary gear type transmission mechanism provided with a torque converter as a fluid coupling. The present invention is not limited to an automatic transmission having a planetary gear type transmission mechanism, and may be a continuously variable transmission such as a belt type continuously variable transmission.
[0028]
With reference to FIG. 1, a power train of a vehicle including a control device according to the present embodiment will be described. Specifically, the control apparatus according to the present embodiment is realized by an ECT (Electronic Controlled Automatic Transmission) _ECU 1020 shown in FIG.
[0029]
As shown in FIG. 1, the power train of this vehicle includes an engine 100, a torque converter 200, an automatic transmission 300, and an ECU 1000.
[0030]
The output shaft of engine 100 is connected to the input shaft of torque converter 200. Engine 100 and torque converter 200 are connected by a rotating shaft. Therefore, output shaft speed NE (engine speed NE) of engine 100 detected by engine speed sensor 400 and input shaft speed (pump speed) of torque converter 200 are the same.
[0031]
The torque converter 200 has a lock-up clutch that directly connects the input shaft and the output shaft, a pump impeller on the input shaft side, a turbine impeller on the output shaft side, and a one-way clutch, and exhibits a torque amplification function. It consists of a stator. Torque converter 200 and automatic transmission 300 are connected by a rotating shaft. The output shaft rotational speed NT (turbine rotational speed NT) of the torque converter 200 is detected by a turbine rotational speed sensor. The output shaft rotational speed NOUT of the automatic transmission 300 is detected by the output shaft rotational speed sensor 420.
[0032]
Such an automatic transmission 300 includes a plurality of friction elements such as clutches and brakes. Based on a predetermined operation table, clutch elements (for example, clutches C1 to C4) that are friction elements, brake elements (for example, brakes B1 to B4), and one-way clutch elements (for example, one-way clutches F0 to F3) are required. The hydraulic circuit is controlled so as to be engaged and released corresponding to each gear stage. Shift positions (shift positions) of the automatic transmission 300 include a parking (P) position, a reverse travel (R) position, a neutral (N), and a forward travel (D) position.
[0033]
The ECU 1000 that controls these power trains includes an engine ECU 1010 that controls the engine 100 and an ECT_ECU 1020 that controls the automatic transmission 300.
[0034]
The ECT_ECU 1020 is supplied with an AT hydraulic oil temperature signal indicating the temperature of the hydraulic oil of the automatic transmission 300 and a signal indicating the output shaft rotational speed NOUT detected by the output shaft rotational speed sensor 420. Further, the engine speed signal representing the engine speed NE detected by the engine speed sensor 400 is input from the engine ECU 1010 to the ECT_ECU 1020.
[0035]
These rotation speed sensors are provided to face the teeth of the rotation detection gear attached to the input shaft of torque converter 200, the output shaft of torque converter 200, and the output shaft of automatic transmission 300. These rotational speed sensors are sensors that can detect slight rotations of the input shaft of the torque converter 200, the output shaft of the torque converter 200, and the output shaft of the automatic transmission 300. This is a sensor using a magnetoresistive element.
[0036]
Further, a diagnosis monitor coupler 1040 is connected to engine ECU 1010 and ECT_ECU 1020. The diagnostic monitor coupler 1040 is a connector having a plurality of terminals for transmitting and receiving data for displaying various types of information on a diagnostic monitor outside the vehicle. By short-circuiting a specific terminal (TC terminal 1050) among the plurality of terminals of the diagnostic monitor coupler, the diagnostic mode is shifted from the normal mode to the diagnostic mode without using the diagnostic monitor, and the diagnosed fault contents Accordingly, the lamp of the automobile meter panel can be blinked in a predetermined pattern or the like.
[0037]
Further, ECT_ECU 1020 is connected to shift position indicator 1030, and a signal representing the current position of automatic transmission 300 is output from ECT_ECU 1020 to shift position indicator 1030. These positions include at least a parking (P) position, a reverse traveling (R) position, a neutral (N), and a forward traveling (D) position, and the shift position indicator 1030 has a display unit corresponding to each position. .
[0038]
With reference to FIG. 2, a control structure of a program executed by ECT_ECU 1020 of ECU 1000 according to the present embodiment will be described.
[0039]
In step (hereinafter step is abbreviated as S) 100, ECT_ECU 1020 determines whether or not a short circuit of TC terminal 1050 of diagnostic monitor coupler 1040 has been detected. If a short circuit of TC terminal 1050 of diagnosis monitor coupler 1040 is detected (YES in S100), the process proceeds to S110. If not (NO in S100), the process returns to S100 and waits until a short circuit of the TC terminal 1050 of the diagnostic monitor coupler 1040 is detected.
[0040]
In S110, ECT_ECU 1020 detects a special operation. At this time, for example, based on a shift position signal input to the ECT_ECU 1020, a reciprocating operation between the neutral (N) position and the forward travel (D) position of the shift lever is predetermined within a predetermined time. Detects that the number of times has been exceeded. Other special operations such as repeated on / off of the brake lamp switch, repeated on / off of the air conditioner switch, repeated on / off of the winker lever, wiper switch or light switch are not normal operations. Operation may be used. Note that this special operation may not be performed. For example, when a predetermined time has elapsed, the process may be moved to S120.
[0041]
In S120, ECT_ECU 1020 starts the oil level adjustment mode.
[0042]
In S130, ECT_ECU 1020 determines whether or not it has been detected that the short circuit of TC terminal 1050 of diagnostic monitor coupler 1040 has been released. If it is detected that the short circuit of TC terminal 1050 of diagnosis monitor coupler 1040 is released (YES in S130), the process proceeds to S140. If not (NO in S130), the process returns to S130 and waits until it is detected that the short circuit of TC terminal 1050 of diagnosis monitor coupler 1040 has been released.
[0043]
At S140, ECT_ECU 1020 determines whether the shift position is a neutral (N) position or a parking (P) position. If the shift position is either the neutral (N) position or the parking (P) position (YES in S140), the process proceeds to S160. If not (NO in S140), the process proceeds to S200.
[0044]
At S150, ECT_ECU 1020 detects the AT hydraulic fluid temperature. This process is performed based on an AT hydraulic fluid temperature signal input from the automatic transmission 300 to the ECT_ECU 1020.
[0045]
In S160, ECT_ECU 1020 determines whether or not the oil temperature is within a predetermined range. This predetermined range is, for example, 35 to 45 ° C. If the oil temperature is within the predetermined range (YES in S160), the process proceeds to S170.
[0046]
If not (NO in S160), the process proceeds to S180.
In S170, ECT_ECU 1020 determines that the oil level can be adjusted, and outputs a control signal to shift position indicator 1030 to light, for example, the forward travel (D) position lamp of shift position indicator 1030.
[0047]
In S180, ECT_ECU 1020 determines whether or not the oil temperature is equal to or higher than a predetermined range. If the oil temperature is equal to or higher than the predetermined range (YES in S180), the process proceeds to S190. If not (NO in S180), the process proceeds to S200.
[0048]
At S190, ECT_ECU 1020 outputs a control signal for causing shift position indicator 1030 to blink, for example, an indicator for forward travel (D) position. In S200, ECT_ECU 1020 outputs a control signal to shift position indicator 1030 so that, for example, the forward travel (D) position indicator is turned off.
[0049]
With reference to FIG. 3, a control structure of a program executed by ECT_ECU 1020 of ECU 1000 according to the present embodiment will be described. The flowchart shown in FIG. 3 is a program for terminating the oil level adjustment mode.
[0050]
In S300, ECT_ECU 1020 determines whether or not the oil level adjustment mode has been started. The process for starting the oil level adjustment mode corresponds to the process in S120 of FIG. If the oil level adjustment mode has been started (YES in S300), the process proceeds to S310. If not (NO in S300), the process returns to S300 and waits until the oil level adjustment mode is started (until the process of S120 is executed).
[0051]
At S310, ECT_ECU 1020 detects engine speed NE. At this time, ECT_ECU 1020 detects engine speed NE based on the engine speed signal received from engine ECU 1010. In S320, ECT_ECU 1020 detects the vehicle speed. At this time, the ECT_ECU 1020 detects the vehicle speed based on the output shaft speed signal NOUT received from the automatic transmission 300.
[0052]
In S330, ECT_ECU 1020 determines whether engine speed NE is greater than the engine speed threshold and vehicle speed is lower than the vehicle speed threshold. If engine speed NE is greater than the engine speed threshold value and the vehicle speed is lower than the vehicle speed threshold value (YES in S330), the process returns to S310. Thereafter, the engine speed NE and the vehicle speed are detected, and the process of S330 is repeated. If not (NO in S330), the process proceeds to S340. That is, “NO” in S330 means that the engine speed NE is equal to or less than the engine speed threshold value (for example, a value close to 0) and the engine 100 is not rotating, or the vehicle speed is the vehicle speed. This is the case when the vehicle starts to run above the threshold. In such a case, the oil level adjustment mode is terminated.
[0053]
In S340, ECT_ECU 1020 outputs a control signal to shift position indicator 1030 so as to turn off, for example, the forward travel (D) position indicator.
[0054]
A vehicle oil level adjustment method according to the present embodiment based on the above-described structure and flowchart will be described.
[0055]
The vehicle is brought into a dealer or the like, and the operator short-circuits the TC terminal 1050 of the diagnostic monitor coupler 1040 (YES in S100). When the shift lever is repeatedly operated between the forward travel (D) position and the neutral (N) position during a predetermined short time (S110), the oil level adjustment mode is started (S120).
[0056]
When the operator cancels the short circuit of TC terminal 1050 of diagnostic monitor coupler 1040 (YES in S130), engine 100 is controlled by engine ISC function of engine ECU 1010 so as to have a predetermined target idle engine speed, and engine 100 is controlled. Becomes a stable idle state.
[0057]
If the shift position is the neutral (N) position or the parking (P) position (YES at S140), the AT hydraulic oil temperature is detected (S150), and if the oil temperature is within the predetermined range (YES at S160). It is determined that the oil level can be adjusted (S170).
[0058]
At this time, for example, the forward travel (D) position indicator of the shift position indicator 1030 is lit. When the forward drive (D) position indicator of the shift position indicator 1030 is lit, the operator opens the overflow plug, and if oil leaks, the operator determines that the leak has been settled and the oil is discharged from the overflow plug. If the oil does not leak, the oil level of the automatic transmission 300 is adjusted by adding oil while rotating the engine 100 until the oil leaks.
[0059]
Even if the shift position is the neutral (N) position or the parking (P) position (YES in S140), the detected AT hydraulic oil temperature is not within the predetermined range (NO in S160), and the oil temperature is predetermined. If the temperature is equal to or higher than the range (YES in S180), for example, the forward travel (D) position indicator of shift position indicator 1030 blinks (S190).
[0060]
In this case, the operator is in a case where the outside air temperature is high and the oil temperature of the automatic transmission 300 has risen above the appropriate temperature range during oil level adjustment simply by leaving the engine 100 in an idle state. to decide. Therefore, the operator determines that the oil temperature exceeds the appropriate temperature, stops the rotation of engine 100, and leaves the vehicle stopped. By doing so, the oil temperature of the oil of the automatic transmission 300 is gradually lowered, and the oil temperature is lowered to an oil temperature suitable for the oil level adjustment of the automatic transmission 300.
[0061]
On the other hand, if the shift position is neither the neutral (N) position nor the parking (P) position (NO in S140), or if the AT hydraulic fluid temperature is a low temperature below a predetermined range (NO in S180), For example, the forward travel (D) position indicator of the shift position indicator 1030 is turned off (S200). At this time, the operator can determine that the oil level of the automatic transmission 300 cannot be adjusted, and does not perform the oil level adjustment operation.
[0062]
On the other hand, when the oil level adjustment mode is started (YES in S300), engine speed NE is detected (S310), and the vehicle speed is detected (S320). When engine speed NE is greater than engine speed threshold and vehicle speed is lower than vehicle speed threshold (YES in S330), the oil level adjustment mode in S120 shown in FIG. 2 is started. Continued state continues. On the other hand, if the detected engine speed NE is equal to or lower than the engine speed threshold value or the detected vehicle speed is equal to or higher than the vehicle speed threshold value (NO in S330), the indicator is turned off (S340). ). At this time, the oil level adjustment mode has ended. Since the indicator is turned off (S340), the operator does not adjust the oil level of the automatic transmission 300.
[0063]
As described above, according to the oil level adjustment method according to the present embodiment, the oil level adjustment mode is started by performing a special operation by short-circuiting a specific terminal (TC terminal) of the diagnostic monitor coupler. Then, the short circuit of the TC terminal is released, and the idle rotation of the engine is stabilized by the ISC function. In such a state, if it is determined that the oil level can be adjusted according to the shift position state and the oil temperature state, for example, the forward running (D) position indicator of the shift position indicator is turned on. When the oil temperature is not within the predetermined range but above the predetermined range, the indicator blinks. When the shift position is neither the neutral (N) position nor the parking (P) position, or when the oil temperature is below a predetermined range, the indicator is turned off. Further, the indicator is turned off when the engine speed is equal to or lower than the engine speed threshold or the vehicle speed is equal to or higher than the vehicle speed threshold. The worker can determine whether or not the oil level can be adjusted based on the display of the indicator. If it is determined that the oil level cannot be adjusted, and the indicator is flashing, the oil temperature has risen too much, so the engine is stopped and the vehicle is left as it is to reduce the oil temperature. Can be lowered.
[0064]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
[Brief description of the drawings]
FIG. 1 is a control block diagram of an automatic transmission according to an embodiment of the present invention.
FIG. 2 is a flowchart (No. 1) showing a control structure of a program executed by the ECU according to the embodiment of the present invention.
FIG. 3 is a flowchart (No. 2) showing a control structure of a program executed by the ECU according to the embodiment of the present invention.
[Explanation of symbols]
100 engine, 200 torque converter, 300 automatic transmission, 400 engine speed sensor, 420 output shaft speed sensor, 1000 ECU, 1010 engine ECU, 1020 ECT_ECU, 1030 shift position indicator, 1040 diagnostic monitor coupler, 1050 TC terminal.

Claims (7)

An oil level adjustment method for an automatic transmission mounted on a vehicle having a self-diagnosis function,
A diagnostic mode transition step of operating the output unit for outputting the result of the self-diagnosis function to the outside of the vehicle and shifting from the normal mode to the self-diagnosis mode;
An adjustment mode transition step for performing a predetermined operation to shift to the oil level adjustment mode;
After shifting to the oil level adjustment mode, operating the output unit to shift from the self-diagnosis mode to the normal mode,
An oil level adjustment method for an automatic transmission including a notification step of notifying an operator that the oil level can be adjusted when the vehicle is in a predetermined state. In the self-diagnosis mode, the oil level adjustment method does not execute engine idle speed control, and in the normal mode, the oil level adjustment method for a vehicle in which engine control for executing engine idle speed control is executed. The oil level adjustment method for an automatic transmission according to claim 1, wherein The oil level adjustment method for an automatic transmission according to claim 2, wherein the engine control executes feedback control of idle speed control. The oil level adjustment method for an automatic transmission according to claim 2, wherein the engine control executes control for forcibly converging the idle speed to a target speed. The predetermined state is that the engine rotational speed of the vehicle is within a predetermined range, the vehicle speed of the vehicle is within a predetermined range, and whether the shift position of the transmission is a neutral position or a parking position. The oil level adjustment method for an automatic transmission according to any one of claims 1 to 4, wherein the oil level is satisfied. The notification step includes a step of notifying the operator that the oil level can be adjusted and the oil level cannot be adjusted based on the temperature of the oil. An oil level adjustment method for an automatic transmission according to claim 1. The oil level adjusting method for an automatic transmission according to claim 6, wherein the notifying step includes a step of notifying an operator that the oil level cannot be adjusted because the oil temperature is higher than a predetermined range. .

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