JP2018071625A - Automatic transmission and control method of automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic transmission and a control method of the automatic transmission, capable of preventing unexpected park lock from being actuated due to misoperation of a P button.SOLUTION: An automatic transmission TM includes: a park module 32; an actuator 32a configured to drive the park module 32; an ATCU 10 configured to, when a setting range of the automatic transmission TM is set to a P range, drive the actuator 32a; and a shifter 6. The shifter 6 has a lever 6a and a P button 6b. The ATCU 10 is configured to, when a state where the lever 6a is operated to a position other than a neutral position HOM, and a P range setting request are overlapped with each other, prevent the setting range of the automatic transmission TM from being set to the P range.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an automatic transmission and an automatic transmission control method.

  Park-by-wire automatic transmissions do not have a mechanical linkage between shifters such as shift levers and shift switches and the parking mechanism that locks the output shaft of the automatic transmission in a non-rotatable manner. This is an automatic transmission that outputs an electrical signal to an actuator and operates a parking mechanism or the like by the actuator (Patent Document 1).

  In such an automatic transmission, the mechanical linkage between the shifter and the parking mechanism is not required, so that the layout of the shifter is improved and the parking mechanism can be operated independently of the operation of the shifter. As a result, the degree of freedom in controlling the parking mechanism is improved.

JP 2008-128444 A

  The shifter is used for a range selection operation other than the P range of the automatic transmission, and performs a setting request to the P range of the automatic transmission setting range and a lever that automatically returns to the neutral position after the operation. And a P button which is a button. In this case, there is a concern that the driver may accidentally press the P button when operating the lever.

  For such a concern, for example, when the operation of the P button is completed when the lever is in the neutral position, a request for setting the P range may be accepted. In this way, it is possible to prevent an unintended park lock from being performed at the moment when the P button is accidentally pressed in an attempt to operate the lever.

  However, even in this case, if the driver accidentally presses the P button while operating the lever, and the P button is released after the lever returns to the neutral position, the P range setting request is made at the neutral position. As a result, the P range setting request may be accepted. As a result, there is a risk that unintended parking lock is performed.

  The present invention has been made in view of such problems, and an object of the present invention is to provide an automatic transmission and an automatic transmission control method that prevent unintentional parking lock from being caused by erroneous operation of the P button.

  An automatic transmission according to an aspect of the present invention includes a park lock mechanism that can lock the output shaft of the automatic transmission so as not to rotate, an actuator that drives the park lock mechanism, and a setting range of the automatic transmission is a P range. A control unit that drives the actuator when set, and a shifter used for a range selection operation of the automatic transmission, the shifter is used for a range selection operation other than the P range of the automatic transmission; A lever that automatically returns to the neutral position after operation, and an operating element that is different from the lever and that is used to make a setting request to the P range of the setting range of the automatic transmission. In the automatic transmission configured as described above, the control unit includes a state where the lever is operated in a position other than the neutral position, and the setting request. If you had become it is configured to set range of the automatic transmission so as not to set to the P range.

  According to another aspect of the present invention, a parking lock mechanism capable of locking the output shaft of the automatic transmission so as not to rotate, an actuator for driving the parking lock mechanism, and a shifter used for a range selection operation of the automatic transmission And the shifter is a lever that is used for a range selection operation other than the P range of the automatic transmission and that automatically returns to the neutral position after the operation, and an operating element different from the lever. And an operation element for making a setting request to the P range of the setting range of the automatic transmission, wherein the lever is operated in a position other than the neutral position. When the set state and the setting request overlap, there is provided an automatic transmission control method including not setting the setting range of the automatic transmission to the P range.

  According to these aspects, when the operation of the lever and the operation of the operation element overlap, the setting range of the automatic transmission is not set to the P range, and therefore, after the lever returns to the neutral position, Park lock is not performed due to erroneous operation. For this reason, it is possible to prevent an unintended park lock from being performed due to an erroneous operation of the operation element.

1 is a schematic configuration diagram of a vehicle. It is a figure which shows an example of control of embodiment by a flowchart. It is a figure which shows the 1st example of the timing chart corresponding to control of embodiment. It is a figure which shows the 2nd example of the timing chart corresponding to control of embodiment. It is a figure which shows the 3rd example of the timing chart corresponding to control of embodiment. It is a figure which shows the 4th example of the timing chart corresponding to control of embodiment. It is a figure which shows the 5th example of the timing chart corresponding to control of embodiment. It is a figure which shows the 6th example of the timing chart corresponding to control of embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a schematic configuration diagram of a vehicle. The vehicle includes an engine 1 as a power source. The power of the engine 1 is transmitted to the drive wheels 5 via the automatic transmission TM and the differential device 4.

  The automatic transmission TM includes a torque converter 2 and a transmission mechanism 3. The automatic transmission TM has a drive (D) range, a reverse (R) range, a neutral (N) range, a parking (P) range, etc. as ranges, and any one of them can be set as a set range. it can. The D range and the R range constitute a travel range, and the N range and the P range constitute a non-travel range.

  The setting range of the automatic transmission TM is set by the driver operating the shifter 6 of the automatic transmission TM. The shifter 6 includes a lever 6a and a P button 6b. The lever 6a is a momentary shift lever that automatically returns to the neutral position HOME after the operation, and is used for a range selection operation other than the P range of the automatic transmission TM.

  The P button 6b is provided on the knob portion of the lever 6a. The P button 6b is an operating element that is different from the lever 6a, and constitutes an operating element for making a setting request to the P range of the setting range of the automatic transmission TM. For the P button 6b, a momentary operation type button that is ON only while being pressed is used. When the P button 6b is ON, a P range setting request is made. Which range is selected by the shifter 6 is detected by the shifter position sensor 21 and the P button 6b that detect the operation position of the lever 6a.

  The transmission mechanism 3 is a stepped automatic transmission mechanism, and includes a planetary gear mechanism and a plurality of friction engagement elements. The speed change mechanism 3 can switch the gear ratio and the forward / reverse travel by changing the engagement state of the plurality of friction engagement elements. In the following description, clutches and brakes that are engaged when the set range of the automatic transmission TM is set to the travel range are collectively referred to as a power transmission clutch 33.

  The speed change mechanism 3 further includes a control valve unit 31 and a park module 32. The control valve unit 31 includes a plurality of solenoids that control the hydraulic pressures of the plurality of friction engagement elements of the transmission mechanism 3.

  The park module 32 mechanically locks the output shaft of the speed change mechanism 3 during parking. When the setting range of the automatic transmission TM is set to the P range, the park rod 32b is driven to the locked position by the actuator 32a. Thereby, an engaging claw (not shown) is engaged with a park gear (not shown) provided on the output shaft of the transmission mechanism 3, and the output shaft of the transmission mechanism 3 is mechanically locked (park lock state). On the other hand, when the set range of the automatic transmission TM is set to a range other than the P range, the park rod 32b is driven to the unlock position by the actuator 32a. As a result, the engagement claw and the park gear (not shown) are disengaged, and the output shaft of the transmission mechanism 3 is unlocked (park lock release state).

  The ATCU 10 is a control unit for the automatic transmission TM and controls the automatic transmission TM. The ATCU 10 includes an accelerator opening sensor 11 that detects an accelerator opening APO that is an operation amount of an accelerator pedal, a vehicle speed sensor 12 that detects a vehicle speed VSP, a parking position sensor 13 that detects a position of a park rod 32b of a park module 32, and the like. The signal from is input.

  The ATCU 10 is connected to the SCU 20, the ECU 30, the BCM 40, and the MCU 50 through the CAN 60 so as to be able to communicate with each other.

  The SCU 20 is a shift control unit. The SCU 20 generates a requested range signal corresponding to the range selected by the shifter 6 based on signals from the shifter position sensor 21 and the P button 6b and outputs the request range signal to the ATCU 10.

  The ATCU 10 sets the setting range of the automatic transmission TM based on the request range signal from the SCU 20. The ATCU 10 outputs a control command value to the control valve unit 31 as described below according to the set range of the automatic transmission TM.

  When the range of the automatic transmission TM is set to the D range, the ATCU 10 determines a target shift stage with reference to the shift map based on the vehicle speed VSP and the accelerator opening APO, and a control command for achieving the target shift stage. The value is output to the control valve unit 31. Thus, the plurality of solenoids are controlled in accordance with the control command value, the hydraulic pressures of the plurality of friction engagement elements are adjusted, and the target shift stage is achieved.

  When the setting range of the automatic transmission TM is set to the R range, the ATCU 10 performs R range control. The R range control is a shift control of the automatic transmission TM performed according to the selection of the R range, and is a control for achieving the reverse gear. In the R range control, the target shift speed is determined as the reverse speed, and a control command value for achieving the target shift speed is output to the control valve unit 31. As a result, the plurality of solenoids are controlled to achieve the reverse gear.

  When the setting range of the automatic transmission TM is set to the P range or the N range, the ATCU 10 outputs a control command value for releasing the power transmission clutch 33 to the control valve unit 31. When the set range is the P range, the ATCU 10 further operates the actuator 32a of the park module 32 to place the automatic transmission TM in the park lock state.

  The ECU 30 is an engine control unit and controls the engine 1. The ECU 30 outputs the rotational speed NE of the engine 1, the throttle opening TVO, and the like to the ATCU 10.

  The BCM 40 is a body control module and controls the vehicle body side operation element. The vehicle body side operation element is, for example, a vehicle door lock mechanism or the like, and includes a starter of the engine 1. The BCM 40 outputs to the ATCU 10 an ON / OFF signal of a door lock switch that detects a door lock of the vehicle, an ON / OFF signal of an ignition switch of the engine 1, and the like.

  The MCU 50 is a meter control unit, and controls a meter, a warning light, a display, a range indicator 51 that displays a set range of the automatic transmission TM, and the like provided in the vehicle interior.

  As described above, the shifter 6 includes the lever 6a and the P button 6b. For this reason, there is a concern that the driver erroneously presses the P button 6b when operating the lever 6a.

  For such a concern, for example, a P range setting request may be accepted when the operation of the P button 6b is completed when the lever 6a is in the neutral position HOME. In this way, it is possible to prevent an unintended park lock from being performed at the moment when the driver erroneously presses the P button 6b in an attempt to operate the lever 6a.

  However, even in this case, if the driver accidentally presses the P button 6b during the operation of the lever 6a and the P button 6b is released after the lever 6a returns to the neutral position HOME, the P range setting request is issued. Since it is performed in HOME, the P range setting request is accepted. As a result, there is a concern that an unintended park lock is performed.

  In view of such circumstances, in this embodiment, the ATCU 10 executes the control described below.

  FIG. 2 is a diagram illustrating an example of control performed by the ATCU 10 using a flowchart. In step S1, the ATCU 10 determines whether or not the P button 6b is ON. If the P button 6b is OFF, a negative determination is made in step S1, and the processing of this flowchart is temporarily terminated. If the P button 6b is ON, an affirmative determination is made in step S1, and the process proceeds to step S2. In step S1, an affirmative determination is made when the P button 6b is operated from OFF to ON.

  In step S2, the ATCU 10 determines whether or not the operation position of the lever 6a is the neutral position HOME based on a signal from the shifter position sensor 21. The neutral position HOME is a position where a P range setting request can be accepted. If the determination in step S2 is negative, the lever 6a has been operated in a position other than the neutral position HOME, and has been operated so as to automatically return to the neutral position HOME after the operation. If a negative determination is made in step S2, the process proceeds to step S3.

  In step S3, the ATCU 10 turns on the flag F. The flag F is a flag indicating whether or not the above-described state of the lever 6a and the operation of the P button 6b are overlapped, and is turned ON when these overlap. Thereby, it is memorize | stored as a double operation experience that they overlapped.

  If the determination in step S2 is affirmative, the process proceeds to step S4, and the ATCU 10 determines whether it is time to start operating the P button 6b. Whether or not it is time to start the operation of the P button 6b can be determined, for example, based on whether or not the process proceeds to step S4 following the affirmative determination in steps S1 and S2. If the determination is affirmative in step S4, the process proceeds to step S5.

  In step S5, the ATCU 10 turns off the flag F. Thereby, when the operation position of the lever 6a is the neutral position HOME and the operation of the P button 6b is started, the memory of the double operation experience is reset.

  After step S3 or step S5, the process proceeds to step S6. In step S6, the ATCU 10 determines whether or not the operation of the P button 6b has been completed. If the P button 6b is ON, a negative determination is made in step S6, and the process returns to step S2. As a result, it is determined whether or not the operation position of the lever 6a is the neutral position HOME following the operation of the P button 6b.

  When the operation position of the lever 6a becomes the neutral position HOME during the operation of the P button 6b and an affirmative determination is made in step S2, a negative determination is made in step S4, and the process proceeds to step S6. Thereby, even if the operation position of the lever 6a becomes the neutral position HOME during the operation of the P button 6b, if the flag F is ON, it remains ON. Thereafter, when the P button 6b is operated from ON to OFF, an affirmative determination is made in step S6, and the process proceeds to step S7.

  In step S7, the ATCU 10 determines whether or not the flag F is ON. If the determination in step S7 is affirmative, the process proceeds to step S8, and the ATCU 10 cancels the P range setting request. Thereby, when the operation of the lever 6a and the operation of the P button 6b overlap, the setting range of the automatic transmission TM is not set to the P range.

  If a negative determination is made in step S7, the process proceeds to step S9, and the ATCU 10 accepts a setting request for the P range. Specifically, the ATCU 10 sets the target range of the automatic transmission TM to the P range. After step S8 or step S9, the process of this flowchart is once complete | finished.

  3 to 8 are diagrams showing examples of timing charts corresponding to the flowchart of FIG. 3 to 8 show a case where different P buttons 6b are operated for the same operation of the lever 6a.

  In the example shown in FIG. 3, when the set range is the D range and the operation position of the lever 6a is the neutral position HOME, the operation of the P button 6b is started. As a result, the P button 6b is turned from OFF to ON. Thereafter, the operation of the P button 6b ends while the lever 6a is in the neutral position HOME. As a result, the P button 6b is turned from ON to OFF at the timing T1.

  At timing T1, the flag F is OFF. For this reason, when the P button 6b is turned from ON to OFF at the timing T1, a setting request for the P range is accepted, and the target range is set to the P range.

  The target range is set to the set range of the automatic transmission TM in a state where a predetermined condition such as a park lock execution condition is satisfied. In this example, the target range is changed according to the operation of the shifter 6 when a predetermined condition is established. For this reason, when the target range is set to the P range, the set range is also set to the P range. The same applies to the examples shown in FIGS.

  Thereafter, the lever 6a is operated to select the R range at the timing T2. When the set range is the P range, in the shifter 6, the range from the neutral position HOME to the range selection position SLCT on the one end side becomes the R range by sandwiching the N range between the intermediate positions MID. The same applies when the setting range is the D range.

  Therefore, when the lever 6a is operated to select the R range, the operation position of the lever 6a is changed from the neutral position HOME to the intermediate position MID set to the N range at the timing T2, and further to the R range at the timing T3. The range selection position SLCT is changed. As a result, the set range changes from the P range to the N range and further to the R range. The range of the range selection position SLCT can be grasped by the range indicator 51 together with the setting range corresponding to the HOME position. Thereafter, when the operation ends at timing T4, the lever 6a automatically returns to the HOME position at timing T5 via the intermediate position MID set to the N range. At this time, the set range remains the R range.

  In the example shown in FIG. 4 as well, as in the example shown in FIG. 3, when the operation position of the lever 6a is the neutral position HOME, the P button 6b is turned on. However, in this example, when the P button 6b is ON, the lever 6a is operated to select the R range at the timing T2. As a result, the operation position of the lever 6a becomes the intermediate position MID during the operation of the P button 6b. That is, the state in which the lever 6a is operated other than the neutral position HOME overlaps the operation of the P button 6b. As a result, the flag F is turned ON at timing T2.

  Thereafter, the P button 6b is turned OFF between the timing T2 and the timing T3, that is, while the lever 6a is at the intermediate position MID. However, the flag F remains ON at this time. For this reason, even if the P button 6b is turned OFF, the P range setting request is canceled and the target range remains the N range. That is, since the target range is not set to the P range, the set range is not set to the P range.

  In the example shown in FIG. 5, the P button 6b is turned ON between the timing T3 and the timing T4, that is, in a state where the lever 6a is operated to the range selection position SLCT other than the neutral position HOME. Therefore, also in this case, the flag F is turned on. Thereafter, the P button 6b is turned OFF in a state where the lever 6a is continuously operated to the range selection position SLCT. However, the flag F remains ON at this time. For this reason, also in this case, the target range is not set to the P range.

  In the example shown in FIG. 6, the P button 6b is turned ON at the intermediate position MID between the timing T4 and the timing T5, that is, during the return of the lever 6a from the range selection position SLCT to the neutral position HOME. Therefore, also in this case, the flag F is turned on. Thereafter, the P button 6b is turned off after the lever 6a returns to the neutral position HOME at the timing T5. However, the flag F remains ON at this time. For this reason, also in this case, the target range is not set to the P range.

  In the example shown in FIG. 7, when the lever 6a returned to the neutral position HOME is in the neutral position HOME, the P button 6b is turned from OFF to ON, and further from ON to OFF. At timing T6 when the P button 6b is turned off, the flag F is turned off. For this reason, at timing T6, the target range is set to the P range.

  In the example shown in FIG. 8, the P button 6b is turned on at timing T1, and the P button 6b is turned off at timing T6. However, at the timing T6, the flag F turned on at the timing T2 is turned on as it is. For this reason, the target range is not set to the P range. Thereafter, at timing T7, when the lever 6a is in the neutral position HOME, the P button 6b is turned ON. As a result, the flag F is turned off.

  Thereafter, the P button 6b is turned OFF when the lever 6a is in the neutral position HOME at timing T8. At this time, the flag F remains OFF. For this reason, at timing T8, the target range is set to the P range.

  Next, main effects of the automatic transmission TM will be described.

  The automatic transmission TM includes a park module 32, an actuator 32a that drives the park module 32, an ATCU 10 that drives the actuator 32a when the setting range of the automatic transmission TM is set to the P range, and a shifter 6. . The shifter 6 includes a lever 6a and a P button 6b. The ATCU 10 is configured not to set the setting range of the automatic transmission TM to the P range when the state in which the lever 6a is operated other than the neutral position HOME overlaps with the P range setting request.

  According to such a configuration, when the operation of the lever 6a and the operation of the P button 6b overlap, the setting range of the automatic transmission TM is not set to the P range, so the lever 6a returns to the neutral position HOME. Thereafter, the park lock is not performed due to an erroneous operation of the P button 6b. For this reason, it is possible to prevent an unintended park lock from being performed due to an erroneous operation of the P button 6b (effect corresponding to claims 1 and 5).

  In the automatic transmission TM, the P button 6b constitutes an operating element that makes a P range setting request during operation and stops making a P range setting request when the operation ends. The ATCU 10 does not set the setting range of the automatic transmission TM to the P range when the state of the lever 6a and the operation of the P button 6b overlap.

  By configuring the automatic transmission TM in this way, it is possible to prevent unintentional parking due to an erroneous operation of the P button 6b while using the P button 6b having good operability. Corresponding effect).

  The ATCU 10 stores the experience that the state of the lever 6a and the operation of the lever 6a overlap each other by turning on the flag F. When the flag F is OFF and the operation of the lever 6a is completed, the ATCU 10 accepts a setting request for the P range by setting the target range to the P range.

  According to such a configuration, it is possible to appropriately set the setting range to the P range while preventing unintentional park lock due to an erroneous operation of the lever 6a (effect corresponding to claim 3).

  The ATCU 10 turns on the flag F when the operation position of the lever 6a is other than the neutral position HOME and the P button 6b is operated, the operation position of the lever 6a is the neutral position HOME, and the P button 6b When the operation is started, the flag F is turned off.

  According to such a configuration, the setting request to the P range can be appropriately canceled or accepted by the flag F (effect corresponding to claim 4).

  As mentioned above, although embodiment of this invention was described, the said embodiment showed only a part of application example of this invention, and the meaning which limits the technical scope of this invention to the specific structure of the said embodiment. Absent.

  In the above-described embodiment, the case where the P button 6b constitutes an operation element has been described. However, the operation element is configured to make a P range setting request during operation, such as a momentary operation type slide switch or a touch sensor that detects a contact operation, and to stop making a P range setting request when the operation is completed. Other operation elements may be used. Further, an alternate operation type button or switch may be used as the operation element.

  In the embodiment described above, the case where the automatic transmission TM is a stepped automatic transmission has been described. However, the automatic transmission TM may be a continuously variable transmission, for example.

6 Shifter 6a Lever 6b P button (operation element)
10 ATCU (control unit)
20 SCU
32 Park module (park lock mechanism)
32a Actuator TM Automatic transmission

Claims (5)

A park lock mechanism capable of locking the output shaft of the automatic transmission in a non-rotatable manner;
An actuator for driving the park lock mechanism;
A control unit that drives the actuator when a setting range of the automatic transmission is set to a P range;
A shifter used for a range selection operation of the automatic transmission;
With
The shifter is
A lever that is used for a range selection operation other than the P range of the automatic transmission and that automatically returns to the neutral position after the operation;
An operating element different from the lever, the operating element for making a setting request to the P range of the setting range of the automatic transmission;
An automatic transmission comprising:
The control unit does not set the setting range of the automatic transmission to the P range when the state where the lever is operated other than the neutral position and the setting request overlap.
An automatic transmission characterized by that. The automatic transmission according to claim 1,
The operation element is an operation element that makes the setting request during operation and stops the setting request when the operation ends.
The control unit does not set the setting range of the automatic transmission to the P range when the state of the lever and the operation of the operation element overlap.
An automatic transmission characterized by that. The automatic transmission according to claim 2,
The control unit is
Memorize the experience of overlapping the state of the lever and the operation of the operating element;
When the operation of the operation element is completed in a state where the experience is not stored, the setting request is accepted.
An automatic transmission characterized by that. The automatic transmission according to claim 3, wherein
The control unit is
When the operation position of the lever is other than the neutral position and the operation element is operating, the experience is stored,
Resetting the experience memory when the operating position of the lever is the neutral position and the operation of the operating element is started;
An automatic transmission characterized by that. A parking lock mechanism capable of locking the output shaft of the automatic transmission in a non-rotatable manner, an actuator for driving the parking lock mechanism, and a shifter used for a range selection operation of the automatic transmission, and the shifter includes: A lever that is used for a range selection operation other than the P range of the automatic transmission and that automatically returns to the neutral position after the operation, and an operating element that is different from the lever. An operation element for making a setting request to a range, and a control method of an automatic transmission comprising:
If the setting operation request overlaps with the state where the lever is operated in a position other than the neutral position, the setting range of the automatic transmission is not set to the P range,
A control method for an automatic transmission, comprising:

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