JP2012013216A - Gear change control apparatus for vehicle automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a driver to reset shift amount without any discomfort by moving a shift member to a wall end position (end position) on the side of P position or D position when the driver can not identify the shift amount of the shift member due to instantaneous power failure.SOLUTION: A current shift position of a detent plate and an instruction value of a shift position shown by instruction values P, Pare sequentially stored into an SRAM. When a driver cannot identify the shift amount of the detent plate (integrated adjustment value) PSE due to instantaneous power failure, the wall end direction when the shift amount PSE is reset after recovery from the instantaneous power failure is determined according to the shift position and the instruction value stored in the SRAM right before the instantaneous power failure. Accordingly, the shift amount PSE of the detent plate can be reset without giving discomfort to the driver due to abnormal noise to be generated when a mechanical parking lock mechanism is started (locked) or released.

Description

  The present invention relates to a so-called shift-by-wire (SBW) type shift switching control device that electrically switches the shift state of an automatic transmission in response to a driver's shift switching operation, and more particularly to an automatic transmission at the time of an instantaneous ECU disconnection or the like. This relates to the control when the actual shift state is lost.

  (a) The automatic transmission is in a power transmission cut-off state and the parking P position for operating the mechanical parking lock mechanism, the R position that enables the automatic transmission to be driven backward, and the automatic transmission in the power transmission cut-off state A shift member that is moved in that order to at least four shift positions of the N position to be moved and the D position that enables the automatic transmission to be driven forward, and (b) the P position side of the shift member and the D (C) a reciprocating movement of the shift member between the P-position side moving end and the D-position side moving end in accordance with an electric signal, and an arbitrary position. (D) a movement amount detection device that detects a relative movement amount of the shift member, and (e) selected by the driver from the four or more shift positions. A shift selection switch for outputting a command value representing the position of the foot; and (f) either the P-position side moving end or the D-position side moving end so as to move the shift member to the shift position represented by the command value. There is known a shift switching control device for an automatic transmission for a vehicle, which has shift switching means for controlling the moving device based on a moving amount detected by the moving amount detecting device with reference to the reference position. The device described in Patent Document 1 is an example of such a shift switching control device, and an electric motor is used as the moving device, and an incremental encoder is used as the moving amount detecting device. In such a shift switching control device, the amount of shift member movement, that is, the shift state of the automatic transmission, may not be known due to a momentary interruption or the like in which the power supply is momentarily interrupted. It has been proposed to reset the amount of movement by moving the member to the P-position side moving end or the D-position side moving end as in the initial setting.

JP 2006-336840 A

  However, when the shift member is moved to the moving end in this way and the moving amount is reset, it becomes a problem which of the moving end of the P position side moving end and the D position side moving end is moved. In other words, since the actual shift state of the automatic transmission is not known, for example, when the mechanical parking lock mechanism is in the parking state, the mechanical parking lock mechanism is released when moved to the D position side moving end. On the other hand, if the vehicle is moved to the P-position side moving end while the vehicle is running, the mechanical parking lock mechanism may not be engaged and may generate abnormal noise. .

  The present invention has been made against the background of the above circumstances, and the object of the present invention is to move the shift member to the P-position side moving end or D-position when the amount of movement of the shift member is lost due to a momentary power interruption or the like. When moving to the side moving end and resetting the moving amount, the moving amount can be reset without causing the driver to feel uncomfortable as much as possible.

  In order to achieve such an object, the first invention is as follows: (a) The automatic transmission is placed in a power transmission cut-off state, the parking P position for operating the mechanical parking lock mechanism, and the automatic transmission can be driven backward. A shift member that can be moved in that order to at least four shift positions: an R position to perform, an N position to place the automatic transmission in a power transmission cut-off state, and a D position to enable the automatic transmission to be driven forward; b) a moving end defining member that respectively defines the moving ends of the shift member on the P position side and the D position side; and (c) moving the shift member on the P position side moving end and the D position side according to an electric signal. (D) a movement amount detection device that detects a relative movement amount of the shift member, and (e) the four More than A shift selection switch for outputting a command value representing the shift position selected by the driver from the G position, and (f) the P-position side movement so as to move the shift member to the shift position represented by the command value. Shift switching means for controlling the moving device based on the amount of movement detected by the amount-of-movement detecting device using either the end or the D-position side moving end as a reference position. In the shift switching control device, (g) a shift state storage device capable of sequentially storing the current shift position of the shift member and the command value and retaining the stored contents even when the power is cut off, and (h) the reference position When the shift amount of the shift member with respect to is unknown, the shift position and the command value stored in the shift state storage device are not at the P position. And a movement amount resetting means for resetting the movement amount of the shift member relative to the reference position by moving the shift member to the D-position side moving end.

  According to a second aspect of the present invention, in the shift switching control device for an automatic transmission for a vehicle according to the first aspect, the movement amount resetting means is configured such that the shift position stored in the shift state storage device is the P position or the D position. When the command value stored in the shift state storage device is the P position or the D position, the shift member is moved to the shift end on the shift position side indicated by the command value and the shift member with respect to the reference position The amount of movement is reset.

  According to a third aspect of the present invention, in the shift switching control device for an automatic transmission for a vehicle according to the first aspect, the movement amount resetting means is: (a) when the command value stored in the shift state storage device is at the P position. Moving the shift member to the P-position side moving end wherever the shift position is stored in the shift state storage device, and resetting the movement amount of the shift member relative to the reference position, and (b) the shift When the command value stored in the state storage device is the D position, the shift member is moved to the D-position side moving end wherever the shift position is stored in the shift state storage device, and is relative to the reference position. (C) the shift position stored in the shift state storage device is the P position, and the command value stored in the shift state storage device is Position or at the time of the N position, characterized in that said shift member is moved to the P position side moving end to reset the amount of movement of the shift member relative to the reference position.

  In such a shift switching control device for an automatic transmission for a vehicle, the current shift position and command value of the shift member are sequentially stored in a shift state storage device, and the amount of movement of the shift member is reduced by a momentary power interruption or the like. If the shift position and the command value stored in the shift state storage device are not in the P position when it becomes unknown, the shift member is moved to the D position side moving end to reset the shift member movement amount. To do. That is, if neither the shift position or the command value immediately before the movement amount of the shift member becomes unknown is the P position, the mechanical parking lock mechanism is released even when the shift member is not in the P position even after a return such as an instantaneous interruption. Therefore, by moving the shift member to the D position side moving end, it is possible to reset the movement amount of the shift member without causing the driver to feel uncomfortable.

  In the second invention, when the shift position stored in the shift state storage device is the P position or the D position and the command value is the P position or the D position, the shift member is moved to the shift position side moving end represented by the command value. Since the movement amount is reset, the movement amount of the shift member can be reset without causing the driver to feel uncomfortable. That is, if the command value immediately before the amount of movement of the shift member is unknown is the P position, the vehicle is likely to stop even if the actual shift position is other than the P position, and the shift member is moved to the P position. Even if it is moved to the side moving end and the amount of movement is reset, the mechanical parking lock mechanism is appropriately operated and there is almost no possibility of generating abnormal noise or the like. If the command value immediately before the shift member movement amount is unknown is the D position, the actual shift position is the P position, and the shift member is moved to the D position side moving end to reset the movement amount. Even if the mechanical parking lock mechanism is released at this time, the release of the mechanical parking lock mechanism is intended by the driver, so there is no possibility that the driver will feel uncomfortable.

  In the third aspect of the invention, when the command value stored in the shift state storage device is the P position, the shift member is moved to the P position side moving end wherever the shift position stored in the shift state storage device is The amount of movement is reset, but even if the actual shift position is other than the P position, there is a high possibility that the vehicle is stopped. Therefore, the mechanical parking lock mechanism is appropriately operated to generate abnormal noise or the like. There is little fear. When the command value stored in the shift state storage device is the D position, the shift member is moved to the D position side moving end wherever the shift position stored in the shift state storage device is, and the shift member movement amount is reset. However, even if the mechanical parking lock mechanism is released when the actual shift position is the P position and the shift member is moved to the D position side moving end to reset the movement amount, the mechanical parking lock mechanism Since the release is intended by the driver, there is no fear of causing the driver to feel uncomfortable. Further, when the shift position stored in the shift state storage device is the P position and the command value stored in the shift state storage device is the R position or the N position, the shift member is moved to the P position side moving end to shift. Although the movement amount of the member is reset, it is highly possible that the vehicle is stopped even if the actual shift position is other than the P position. There is little fear of it occurring.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a skeleton diagram illustrating a configuration of an automatic transmission for a vehicle including a shift switching control device according to an embodiment of the present invention. FIG. 2 is a diagram for explaining an operating state of a plurality of hydraulic friction engagement devices when a plurality of gear stages having different gear ratios are established in the automatic transmission shown in FIG. 1. It is a circuit diagram which shows the principal part of the hydraulic control circuit regarding the linear solenoid valve which controls the action | operation of each hydraulic actuator of a clutch and a brake shown in FIG. FIG. 2 is a perspective view showing a shift selection device operated by a driver to switch a shift state of the automatic transmission of FIG. 1. It is a block diagram explaining the principal part of the control system provided in the vehicle in order to control the automatic transmission etc. which are shown in FIG. It is a perspective view which shows schematic structure of the shift switching apparatus controlled by SBW-ECU of FIG. FIG. 7 is a diagram showing the detent plate of FIG. 6, where (a) is a state positioned at the D position, and (b) is a state rotated to the P wall contact position. It is a block diagram explaining the function with which SBW-ECU of FIG. 5 is provided regarding shift switching control. It is a figure which shows the relationship between the shift position of the detent plate of FIG. 7, and the predetermined setting movement amount. It is a flowchart explaining the action | operation at the time of rotating a detent plate to a P wall contact position or a D wall contact position, and resetting a movement amount. It is a figure which shows collectively the combination of the shift position and command value read by step S4 of FIG. 10, and the wall contact direction determined by the combination.

  The present invention can be applied to various vehicles such as an engine-driven vehicle that generates power by burning fuel, an electric vehicle that is driven by an electric motor, or a hybrid vehicle that includes a plurality of power sources.

  The automatic transmission can be switched to three shift states of a power transmission cut-off state, a reverse drive enable state, and a forward drive enable state by switching the hydraulic circuit by a manual valve or the like according to the shift position of the shift member, for example. Thus, a stepped automatic transmission such as a planetary gear type or a parallel shaft type having a plurality of hydraulic friction engagement devices (clutch and brake) is preferably employed. A forward / reverse switching device that simply switches between forward and backward travel, or a combination of the forward / backward switching device and a continuously variable transmission may be used.

  As the shift member, for example, a rotation member such as a detent plate that is reciprocally rotated around a predetermined rotation axis is preferably used. However, the spool of the manual valve is directly used as a shift member to linearly reciprocate in the axial direction. Various modes are possible, such as being allowed to do so. The moving end defining member that defines the moving end of the shift member may define, for example, the P position and the D position as the moving end, but may also define the moving end outside the P position and the D position. The moving end defining member mechanically defines the moving range of the shift member and can be provided separately from the shift member, but can also be provided integrally with the shift member.

  The shift position of the shift member may be only four positions of the P position, the R position, the N position, and the D position. A manual shift position such as the above may be provided. Other shift positions can be set as required.

  The moving device for moving the shift member is appropriately determined according to the movement form of the shift member, and an electric actuator using an electric motor is preferably used. The shift member is mechanically positioned at a plurality of shift positions by a positioning mechanism having a biasing means such as a spring like the detent plate. However, the shift member is positioned at each shift position by a moving device without using the positioning mechanism. Is also possible.

  For example, an incremental rotary encoder is preferably used as the movement amount detection device that detects the movement amount of the shift member, but other detection devices that can detect the relative movement amount can also be adopted. As the shift selection switch, for example, a lever position sensor that detects an operation position of a shift lever in which a plurality of lever positions are set corresponding to the shift position, an ON-OFF switch that is directly operated by a driver, or the like is preferably used. It is done.

  An SRAM is preferably used as the shift state storage device that sequentially stores the shift position of the shift member and the command value of the shift position selected by the driver, but other storage devices that can retain the stored contents even when the power is turned off. It can also be adopted. The shift position of the shift member can be specified from a map of a determination movement amount for each shift position determined in advance based on the movement amount detected by the movement amount detection device. During shift switching for switching the shift position, that is, when the movement amount does not correspond to any determination movement amount, the shift state storage device may store the shift position indefinite (during shift switching). Even when the shift position is indefinite, when the movement amount is reset, the shift position can be handled in the same manner as the R position, N position, and D position, and the command value stored in the shift state storage device is the P position. In other cases, the movement amount may be reset by moving to the D-position side moving end. Note that it is desirable to determine the determination movement amount so as to be identified as the P position until the mechanical parking lock mechanism is completely released.

  In the second and third inventions, when the command value stored in the shift state storage device is the P position, the shift member is moved to the P position side moving end to reset the movement amount. At this time, for example, when the shift position stored in the shift state storage device is other than the P position, the movement amount may be reset by moving to the D position side moving end. In the second and third inventions, when the command value stored in the shift state storage device is at the D position, the shift member is moved to the D position side moving end to reset the movement amount. At the time of implementation, for example, when the shift position stored in the shift state storage device is the P position, the movement amount may be reset by moving to the P position side moving end. In the third invention, when the shift position stored in the shift state storage device is the P position and the command value stored in the shift state storage device is the R position or the N position, the shift member is moved to the P position side moving end. Although the movement amount is reset by resetting, the shift amount may be reset by moving the shift member to the D-position side moving end when the first and second inventions are implemented.

  When the shift member is moved to the D-position side moving end or the P-position side moving end and the movement amount is reset, the shift state of the automatic transmission suddenly changes with the movement of the shift member, and the shock is applied. In the case where there is a possibility of occurrence, it is desirable that the frictional engagement device of the automatic transmission is electrically released as necessary to put the power transmission in a cut-off state in advance.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a skeleton diagram illustrating the configuration of an automatic transmission 10 for a vehicle to which the present invention is applied. The vehicle in the present embodiment has a vertical installation type automatic transmission 10 and adopts an FR (front engine / rear drive) type drive system, and uses an engine 6 as a driving power source. I have. The output of the engine 6 composed of an internal combustion engine is transmitted to left and right drive wheels (not shown) via a torque converter 8 that functions as a fluid transmission device, an automatic transmission 10, a differential gear device (not shown), and a pair of axles. It has come to be.

  In FIG. 1, an automatic transmission 10 is mainly configured by a double pinion type first planetary gear device 12 in a transmission case (hereinafter referred to as a case) 11 as a non-rotating member attached to a vehicle body. A first transmission unit 14 and a second transmission unit 20 mainly composed of a single pinion type second planetary gear unit 16 and a double pinion type third planetary gear unit 18 on a common axis C; The rotation of the input shaft 22 is changed and output from the output shaft 24. The input shaft 22 is also a turbine shaft of the torque converter 8 that is rotationally driven by the engine 6 that is a power source for traveling. As described above, the output shaft 24 rotationally drives the left and right drive wheels, for example, sequentially through a differential gear device (not shown), a pair of axles, and the like. The torque converter 8 and the automatic transmission 10 are substantially symmetrical with respect to the axis of the output shaft 24, that is, the common axis C. In the skeleton diagram of FIG. Half are omitted.

  The first planetary gear unit 12 includes a sun gear S1, a plurality of pairs of pinion gears P1 that mesh with each other, a carrier CA1 that supports the pinion gears P1 so as to rotate and revolve, and a ring gear R1 that meshes with the sun gear S1 via the pinion gears P1. The second planetary gear device 16 includes a sun gear S2, a pinion gear P2, a carrier CA2 that supports the pinion gear P2 so as to be capable of rotating and revolving, and a ring gear R2 that meshes with the sun gear S2 via the pinion gear P2. The third planetary gear unit 18 meshes with the sun gear S3 via the sun gear S3, a plurality of pairs of pinion gears P2 and P3 that mesh with each other, a carrier CA3 that supports the pinion gears P2 and P3 so as to rotate and revolve, and pinion gears P2 and P3. A ring gear R3 is provided.

  The clutches C1 to C4 and the brakes B1 and B2 in FIG. 1 (hereinafter referred to as the clutch C and the brake B unless otherwise specified) are engaged or released by a hydraulic actuator including a hydraulic cylinder and hydraulic pressure supplied to the hydraulic actuator. The hydraulic friction engagement device includes a multi-plate clutch or brake. The first rotating element RM1 (sun gear S2) is selectively connected to the case 11 via the brake B1 and stopped rotating, and the ring gear R1 of the first planetary gear unit 12 serving as an intermediate output member via the clutch C3, that is, The second intermediate output path PA2 is selectively connected to the carrier CA1 of the first planetary gear unit 12, that is, the first intermediate output indirect path PA1b via the clutch C4.

  The second rotating element RM2 (carriers CA2 and CA3) is selectively connected to the case 11 via the brake B2 and stopped rotating, and the input shaft 22, that is, the first intermediate output direct connection path PA1a via the clutch C2. Are selectively connected to each other. The third rotating element RM3 (ring gears R2 and R3) is integrally connected to the output shaft 24 to output rotation. The fourth rotation element RM4 (sun gear S3) is connected to the ring gear R1 via the clutch C1.

  Further, between the second rotating element RM2 and the case 11, a one-way clutch F1 that prevents the reverse rotation while allowing the second rotating element RM2 to rotate forward (the same rotational direction as the input shaft 22) and the brake B2. It is provided in parallel. Further, a parking gear 106 that prevents rotation of the output shaft 24 by meshing with the parking lock pole 108 of the mechanical parking lock mechanism 102 shown in FIG. 6 is fixedly provided on the outer peripheral side of the third rotating element RM3.

  FIG. 2 is a chart for explaining operating states of the engagement elements including the clutch C, the brake B, and the one-way clutch F1 when establishing a plurality of gear stages having different gear ratios in the automatic transmission 10 shown in FIG. “◯” represents the engaged state, “(◯)” represents the engaged state only during engine braking, and the blank represents the released state. As shown in FIG. 2, the automatic transmission 10 of the present embodiment has a gear ratio (the input shaft rotational speed of the automatic transmission 10 is set to the output shaft rotational speed by selectively engaging the engagement elements. Eight forward gears (1st to 8th) and two reverse gears (Rev1, Rev2) having different values can be established. Note that the gear ratio of each gear stage is appropriately determined by the gear ratios of the first planetary gear device 12, the second planetary gear device 16, and the third planetary gear device 18.

  FIG. 3 is a circuit diagram showing a main part of the hydraulic control circuit 25 relating to the linear solenoid valves SL1 to SL6 for shifting and the like for controlling the operation of the hydraulic actuators ACT1 to ACT6 provided in the clutch C and the brake B shown in FIG. is there.

In FIG. 3, the hydraulic pressure supply device 26 adjusts the first line hydraulic pressure P _L1 using the hydraulic pressure generated from a mechanical oil pump 27 that is rotationally driven by the engine 6 as a source pressure, for example, a relief type primary regulator valve (first Pressure regulating valve) 28, a secondary regulator valve (second regulating valve) 29 for regulating the second line hydraulic pressure P _L2 using the hydraulic pressure discharged from the primary regulator valve 28 as a source pressure, and an accelerator operation amount (accelerator opening) Acc Alternatively, the signal pressure P is supplied to the primary regulator valve 28 and the secondary regulator valve 29 in order to regulate the first line oil pressure P _L1 and the second line oil pressure P _L2 according to the engine load or the like represented by the throttle valve opening θ _TH. a linear solenoid valve SLT for supplying _SLT, one first line pressure P _L1 as source pressure And a modulator valve 30 for pressurizing regulated to a modulator pressure P _M.

Further, the hydraulic pressure supply device 26 operates an electric actuator (electric motor) 34 in accordance with an operation of the shift lever 38 and the parking switch 40 shown in FIG. 4, that is, a shift position command value P _SH or P _P output in response to a shift selection operation. Is controlled, a manual valve 32 is provided for switching the oil passage in accordance with the command value P _SH or P _P. The electric actuator 34 switches the oil passage by moving the spool valve element 124 of the manual valve 32 in the axial direction via the detent plate 90 which is a shift member as shown in FIG. 7 (a), it is positioned at four shift positions of P position, R position, N position, and D position by engagement with the positioning roller 96, and oil is moved by the manual valve 32 according to these shift positions. The path is switched.

When the shift lever 38 is operated to drive the command position D for forward travel, the detent plate 90 is pivoted to the D position in accordance with the command value P _SH representing the D position, the manual valve 32 via the detent plate 90 by switched, first line pressure P _L1 is output from the manual valve 32 as the forward pressure P _D. This forward pressure P _D, the automatic transmission 10 is the forward drivable shift state capable of establishing the predetermined forward gear. When the shift lever 38 is operated to the reverse command position R for reverse travel, the detent plate 90 is pivoted in the R position in accordance with the command value P _SH representing R position, the manual valve 32 via the detent plate 90 by switched, first line pressure P _L1 is output from the manual valve 32 as the reverse pressure P _R. The reverse pressure P _R, the automatic transmission 10 is the reverse drivable shift state capable of establishing a predetermined reverse gear. When the shift lever 38 is operated to the neutral command position N that interrupts power transmission, the detent plate 90 is rotated to the N position in accordance with the command value P _SH representing the N position, and the manual valve 32 is passed through the detent plate 90. Is switched to shut off the hydraulic pressure output. As a result, the automatic transmission 10 is shifted to a state where power transmission is interrupted. Further, when the parking switch 40 is turned on, the detent plate 90 is rotated to the P position in accordance with the command value P _P representing the P position, and the manual valve 32 is switched via the detent plate 90, whereby the hydraulic pressure is changed. Is shut off. Also in this case, the automatic transmission 10 is in a shift state in which power transmission is interrupted. Hydraulic pressure supply device 26, the first line pressure P _L1, second line pressure P _L2, and outputs the modulator pressure P _M, the forward pressure P _D, and the reverse pressure P _R.

The hydraulic actuators ACT1 to ACT6 including hydraulic cylinders provided for the clutch C and the brake B are respectively provided with linear solenoid valves SL1 to SL6 (hereinafter referred to as linear solenoid valves SL unless otherwise distinguished). . Hydraulic actuators ACT1, ACT2, ACT5, the ACT6 is by respective linear solenoid valves SL1, SL2, SL5, SL6, the forward pressure P _D supplied from each of the hydraulic pressure supply device 26 is supplied with pressure regulated. The hydraulic actuators ACT3 and ACT4 are supplied with the regulated first line oil pressure P _L1 supplied from the hydraulic pressure supply device 26 by the corresponding linear solenoid valves SL3 and SL4, respectively. Incidentally, the hydraulic actuator ACT6 brake B2, either output hydraulic or reverse pressure P _R of the linear solenoid valve SL6 is adapted to be supplied via the shuttle valve 33.

  Here, the linear solenoid valves SL1 to SL6 basically have the same configuration, and the hydraulic pressures supplied to the hydraulic actuators ACT1 to ACT6 are independently controlled through excitation, de-excitation, and current control. The pressure regulation control is performed to control the engagement pressures of the clutches C and the brakes B, respectively. In the automatic transmission 10, for example, as shown in the engagement operation table of FIG. 2, each gear stage is established by engaging predetermined engagement elements.

FIG. 4 is a perspective view showing a shift selection device 36 having the shift lever 38 and the parking switch 40. The shift selection device 36 is, for example, disposed near the driver's seat and operated by the driver. The shift lever 38 has three selection positions set in the vehicle longitudinal direction, that is, a drive command position D and a reverse command. The position R and the neutral command position N are operated. The shift lever 38 is a momentary type (automatic return type) that automatically returns to the position shown in FIG. 4, that is, the original position (home position) according to the biasing force of a spring (not shown). The shift lever 38 is operated from the original position through the neutral command position N to the drive command position D or the reverse command position R. The shift selection device 36 includes a shift lever position sensor 42 that detects an operation position of the shift lever 38 and supplies a signal representing a command value _PSH corresponding to the operation position to an electronic control device 46 described later. . The parking switch 40 is a push button type ON-OFF switch that is pressed when parking, and when the shift lever 38 is operated, the parking switch 40 needs to be turned OFF in advance. The parking switch 40 and the shift lever position sensor 42 correspond to a shift selection switch.

FIG. 5 is a block diagram illustrating a main part of a control system provided in the vehicle for controlling the automatic transmission 10 and the engine 6 shown in FIG. In FIG. 5, the electronic control unit 46 includes a so-called microcomputer having a CPU, a RAM, a ROM, an input / output interface, and the like. A program stored in the ROM in advance using the temporary storage function of the RAM. The signal processing is performed in accordance with the output control of the engine 6, the shift control of the automatic transmission 10, the shift state of the automatic transmission 10 according to the command values P _SH , P _P , that is, the shift switching control for switching the manual valve 32. Execute. The electronic control unit 46 is divided into an engine output control unit, a shift control unit, and a shift switching control unit as needed. In this embodiment, the electronic control unit 46 performs shift switching by an SBW-ECU (shift-by-wire electronic control unit) 48. Control is to be performed.

The electronic control unit 46 includes a vehicle speed sensor 58 that detects a vehicle speed V, an accelerator operation amount sensor 62 that detects an accelerator operation amount Acc that is an operation amount of an accelerator pedal 60, and an operation amount (force) of a foot brake 64 that is a service brake. The movement amount (rotation angle) of the output shaft 84 of the electric actuator 34 that switches the foot brake operation amount sensor 66 that detects the brake operation amount B, the parking switch 40, the shift lever position sensor 42, and the manual valve 32 is detected. Signals representing vehicle speed V, accelerator operation amount Acc, brake operation amount B, shift position command values P _P , P _SH , encoder signal SE, and the like are supplied from an incremental rotary encoder 80 and the like. The encoder signal SE is a pulse signal representing a relative movement amount.

  FIG. 6 shows a shift for switching the operation state (locking and unlocking) of the mechanical parking lock mechanism 102 for mechanically fixing the rotation of the output shaft 24 of the automatic transmission 10 and switching the manual valve 32. 1 is a perspective view showing a switching device 100. FIG. A detent plate 90 is integrally fixed to the output shaft 84 of the electric actuator 34, and can be integrally rotated around a rotation center O that is an axis of the output shaft 84. The tip of the detent plate 90 is provided with irregularities having four positioning recesses 92 as shown in FIG. 7A, and the positioning roller 96 is engaged with the positioning recesses 92. Thus, positioning is performed at four shift positions of P position, R position, N position, and D position. The spool valve element 124 of the manual valve 32 is engaged in the annular groove of the connecting member 128 with the connecting pin 126 erected on the detent plate 90, so that the axial direction of the spool valve 124 is rotated with the rotation of the detent plate 90. The oil passage is switched in accordance with four shift positions of P position, R position, N position, and D position. The positioning roller 96 is disposed at the tip of a spring plate 134 attached to the upper end of the valve body 130 of the manual valve 32 so as to be rotatable around a support shaft parallel to the rotation center O, and the detent plate 90 is electrically driven. When the actuator 34 is rotated around the rotation center O, it is pushed upward in FIG. 7 (a) following the concave and convex shape against the biasing force of the spring plate 134, whereby the detent plate 90 rotates. Allow movement. The spring plate 134 and the positioning roller 96 constitute a positioning mechanism. 6 and 7 (a) show a state in which the detent plate 90 is positioned at the D position, and FIG. 7 (a) shows a front view of the detent plate 90 viewed from the lower right side in FIG. It is.

  Outer wall surfaces 94p, 94d of the positioning recesses 92 at the P position and the D position in the detent plate 90 are both substantially perpendicular to the rotation direction around the rotation center O, and the positioning roller 96 cannot get over the wall surfaces 94p and 94d, and thereby the moving end on the P position side and the moving end on the D position side of the detent plate 90 are defined. The position of the positioning roller 96 indicated by the alternate long and short dash line in FIG. 7A is in a state where the detent plate 90 is prevented from further rotation by abutting against the wall surfaces 94p and 94d. The P wall contact position where the positioning roller 96 contacts the wall surface 94p is the P position side moving end, the D wall contact position where the positioning roller 96 contacts the wall surface 94d is the D position side moving end, and the wall surfaces 94p and 94d are the moving ends. It functions as a regulating member.

Returning to FIG. 6, an L-shaped parking rod 112 is connected to the detent plate 90 so as to be relatively rotatable about an axis (rotation axis O) parallel to the output shaft 84. The mechanical parking lock mechanism 102 is locked by turning 90 to the P position. That is, a taper member 110 that is engaged with the parking lock pole 108 is attached to the parking rod 112 so as to be movable in the axial direction, and a spring 114 that biases the taper member 110 toward the small diameter end side is disposed. When the detent plate 90 is rotated to the P position, the parking rod 112 is moved in the direction in which the taper member 110 is engaged with the parking lock pole 108, that is, in the upper right direction in FIG. As a result, the taper member 110 is pressed so as to sink under the lock pawl 108 according to the urging force of the spring 114, and the lock pawl 108 is pushed upward in FIG. The output shaft 24 is locked so as not to rotate. That is, when the parking switch 40 is turned on and the detent plate 90 is rotated to the P position according to the command value P _P representing the P position, the automatic transmission 10 is not only shifted to a state where the power transmission is interrupted. Then, the mechanical parking lock mechanism 102 is operated and the output shaft 24 is mechanically locked. When the detent plate 90 is rotated from the P position to the R position, the parking rod 112 is moved in the direction of pulling out the taper member 110 from the bottom of the parking lock pole 108, that is, in the lower left direction in FIG. The lock pole 108 is rotated downward to engage with the parking gear 106, that is, the lock is released.

As shown in FIG. 8, the SBW-ECU 48 functionally includes shift switching means 140, movement amount resetting means 142, movement amount unknown determining means 144, and shift position / command value sequential rewriting means 146 as shown in FIG. These components constitute a shift switching control device. The shift switching means 140 rotates the detent plate 90 to the shift position represented by the shift position command values P _SH and P _P supplied from the shift selection device 36, and is previously stored for each shift position as shown in FIG. The electric actuator 34 is controlled on the basis of a movement amount (rotation angle) PSE obtained from the encoder signal SE of the rotary encoder 80 so as to be rotated by a predetermined set movement amount. That is, when the power of the SBW-ECU 48 is turned on in accordance with the ON operation of the main switch such as the ignition switch, the electric actuator 34 rotates the detent plate 90 to the P wall contact position shown in FIG. The position is set as a reference position with the movement amount PSE = 0. Then, the number of pulses of the encoder signal SE is counted by taking the counterclockwise direction (arrow B direction) of the rotation center O as + and the clockwise direction (arrow A direction) as-, and the movement amount (addition / subtraction integrated value) PSE is obtained. Thus, the operation of the electric actuator 34 is stopped at a position where the movement amount PSE becomes the set movement amount shown in FIG. After the electric actuator 34 is stopped, the positioning roller 96 and the positioning recess 92 of the detent plate 90 are engaged to be positioned at each shift position, and the manual valve 32 is switched according to the shift position, whereby the automatic transmission. 10 is a shift state corresponding to the shift position. The electric actuator 34 corresponds to a moving device, and the rotary encoder 80 corresponds to a moving amount detecting device.

  The set movement amount in FIG. 9 is determined in advance, and the stored contents can be sequentially rewritten and stored in the SRAM 50 that retains the stored contents even when the power is turned off. This is because the shift position shifts when the reference position changes due to wear or the like of the wall surface 94p. For example, the detent plate 90 is moved to the opposite D wall contact position on the opposite side by the electric actuator 34, for example. Is moved to obtain the movement amount PSE from the P wall contact position which is the reference position, and when the movement amount PSE is compared with the set movement amount PDW and the difference becomes a predetermined value or more, The set movement amount at each shift position is corrected and rewritten according to the difference.

On the other hand, when an instantaneous interruption occurs in which the power supply of the SBW-ECU 48 is momentarily interrupted, the information on the moving amount PSE, which is the accumulated addition / subtraction value of the rotary encoder 80, disappears, and the detent at the time of the instantaneous interruption recovery when the power supply is restored The movement amount PSE of the plate 90 and the shift state of the automatic transmission 10 are not known. As a countermeasure, in this embodiment, the movement amount resetting means 142, the movement amount unknown determining means 144, and the shift position / command value sequential rewriting means 146 are functionally provided, and signal processing is performed according to the flowchart of FIG. As a result, the detent plate 90 is appropriately rotated to a predetermined shift position by the shift switching means 140 in accordance with the shift position command values P _SH and P _P even after the instantaneous interruption is restored, and the automatic transmission 10 is It can be switched appropriately to the shift state. Steps S1 and S2 in FIG. 10 correspond to the shift position / command value sequential rewriting means 146, step S3 corresponds to the movement amount unknown determination means 144, and steps S4 to S6, S8 to S10, S13, S14, S16, and S17. Corresponds to a movement amount resetting means.

In step S1 of FIG. 10, it is determined whether or not at least one of the current shift position and the command value of the shift position indicated by the command values P _SH and P _P has changed, and if it has changed, it is updated in step S2. That is, the current shift position and the command value of the shift position indicated by the command values P _SH and P _P are respectively stored in the SRAM 50, and when there is a change, it is sequentially rewritten and updated to the latest one. . The current shift position can be specified from a predetermined shift position determination map based on the movement amount PSE. In the shift position determination map, for example, the determination movement amount regarding the movement amount PSE is determined for each shift position, as in FIG. 9, but the shift is determined by the engagement between the positioning roller 96 and the positioning recess 92. The determination moving amount is determined so as to be determined as the P position until the mechanical parking lock mechanism 102 is completely released, and is determined so as to include the position reliably. It is done. (A) of FIG. 11 is a diagram showing a combination of the current shift position and the command value. “Undefined” in the column of the shift position is a position that does not correspond to any shift position, and between the shift positions. It is in the middle of movement. Further, “stop” in FIG. 11A is a constant shift state in which the shift position and the command value match, and “drive” is a shift transient state in which the shift position and the command value are different. The SRAM 50 that stores the current shift position and command value corresponds to a shift state storage device.

  In step S3, it is determined whether or not the power supply of the SBW-ECU 48 has been momentarily interrupted. This step S3 is executed immediately before the steps S1 and S2 immediately after the power supply of the SBW-ECU 48 is restored. In step S4, the shift position and the command value immediately before the instantaneous interruption stored in the SRAM 50 are read out. In step S5, it is determined whether or not the command value is in the P position. If the command value is in the P position, step S6 is executed. In step S6, the electric actuator 34 causes the wall surface 94p of the detent plate 90 to contact the positioning roller 96 as shown in FIG. The movement amount PSE = 0 is reset at that position. Thereafter, step S7 is executed, and the detent is made up to the shift position (P position) represented by the command value immediately before the instantaneous interruption stored in the SRAM 50 in accordance with the set moving amount map of FIG. 9 based on the moving amount PSE after resetting. The plate 90 is rotated. Thereby, the movement amount resetting process at the time of recovery from the momentary interruption is completed, and thereafter, the shift switching means 140 performs shift switching control.

  If the determination in step S5 is NO (No), that is, if the command value immediately before the instantaneous interruption stored in the SRAM 50 is not the P position, step S8 is executed to determine whether or not the command value is the D position. . When the command value is in the D position, step S9 is executed, and the automatic transmission 10 is turned off by switching all the linear solenoid valves SL1 to SL6 for shifting to the drain side and releasing the clutch C and the brake B. After that, step S10 is executed, and the electric actuator 34 rotates the wall surface 94d of the detent plate 90 to the positioning roller 96 and rotates it to the D wall contact position where further rotation is prevented, and moves at that position. Reset the quantity PSE = PDW. Thereafter, step S11 is executed, and the detent is made to the shift position (D position) represented by the command value immediately before the momentary interruption stored in the SRAM 50 according to the set movement amount map of FIG. 9 based on the movement amount PSE after resetting. A predetermined forward gear stage is established by rotating the plate 90 and engaging a predetermined clutch C or brake B in step S12. Thereby, the movement amount resetting process at the time of recovery from the momentary interruption is completed, and thereafter, the shift switching means 140 performs shift switching control.

  If the determination in step S8 is NO, that is, if the command value immediately before the instantaneous interruption stored in the SRAM 50 is neither the P position nor the D position, step S13 is executed and the shift immediately before the instantaneous interruption stored in the SRAM 50 is performed. It is determined whether the position is the P position. If the shift position is at the P position, step S14 is executed, and the electric actuator 34 rotates to the P wall contact position where the wall surface 94p of the detent plate 90 contacts the positioning roller 96 and further rotation is prevented. The movement amount PSE = 0 is reset at that position. Thereafter, step S15 is executed, and the shift position (in this case, R or N) represented by the command value immediately before the instantaneous interruption stored in the SRAM 50 according to the set movement amount map of FIG. 9 based on the movement amount PSE after resetting. The detent plate 90 is rotated until Thereby, the movement amount resetting process at the time of recovery from the momentary interruption is completed, and thereafter, the shift switching means 140 performs shift switching control.

  If the determination in step S13 is NO, that is, if the shift position immediately before the momentary interruption stored in the SRAM 50 is not the P position, step S16 is executed to switch all the shift linear solenoid valves SL1 to SL6 to the drain side. By releasing the clutch C and the brake B, the automatic transmission 10 is brought into a power transmission cut-off state. In step S17, the electric actuator 34 causes the wall surface 94d of the detent plate 90 to contact the positioning roller 96 and rotate to the D wall contact position where further rotation is prevented, and the movement amount PSE = PDW at that position. Reset to. Thereafter, step S18 is executed, and the shift position (in this case, R or N) represented by the command value immediately before the instantaneous interruption stored in the SRAM 50 according to the set moving amount map of FIG. 9 based on the moving amount PSE after resetting. The detent plate 90 is rotated until In step S19, when the shift position is R, a predetermined reverse gear is established by engaging a predetermined clutch C or brake B. Thereby, the movement amount resetting process at the time of recovery from the momentary interruption is completed, and thereafter, the shift switching means 140 performs shift switching control.

  FIG. 11B shows a step P in which the wall surface 94p or 94d of the detent plate 90 is brought into contact with the positioning roller 96 by the electric actuator 34 and further rotation is prevented in the above-described step S6, S10, S14 or S17. It is the figure which showed the wall contact direction collectively, when rotating to a wall contact position or D wall contact position, and resetting the moving amount PSE to 0 or PDW in that position. As apparent from FIG. 11 (b), when neither the shift position immediately before the instantaneous interruption stored in the SRAM 50 nor the command value is P, the detent reaches the D wall contact position where the wall surface 94d is brought into contact with the positioning roller 96. The plate 90 is rotated to reset the movement amount PSE = PDW. When the shift position immediately before the momentary interruption stored in the SRAM 50 is P or D and the command value is P or D, the wall side 94p if the command value is P, that is, if the command value is P. If the command value is D on the P wall side that is in contact with the positioning roller 96, the detent plate 90 is rotated to the wall contact position on the D wall side where the wall surface 94d is in contact with the positioning roller 96. The movement amount PSE is reset to 0 or PDW. In addition, when the command value immediately before the momentary interruption stored in the SRAM 50 is P, the detent reaches the P wall contact position where the wall surface 94p is brought into contact with the positioning roller 96 regardless of the shift position immediately before the momentary interruption stored in the SRAM 50. The plate 90 is rotated to reset the movement amount PSE = 0, and when the command value immediately before the instantaneous interruption stored in the SRAM 50 is D, the wall surface 94d is located anywhere in the shift position immediately before the instantaneous interruption stored in the SRAM 50. Rotate the detent plate 90 to the D wall contact position where it is brought into contact with the positioning roller 96 and reset the movement amount PSE = PDW. The shift position immediately before the momentary interruption stored in the SRAM 50 is P, and is stored in the SRAM 50. When the command value immediately before the instantaneous interruption is R or N, the detent up to the P wall contact position where the wall surface 94p is brought into contact with the positioning roller 96. The over preparative 90 is rotated to reset the movement amount PSE = 0.

As described above, in the shift switching control device of the present embodiment, the current shift position of the detent plate 90 that is a shift member and the command value of the shift position represented by the command values P _SH and P _P are sequentially stored in the SRAM 50. When the movement amount (addition / subtraction integrated value) PSE of the detent plate 90 becomes unknown due to a momentary power interruption, the shift immediately before the momentary interruption is stored in the SRAM 50 as the wall contact direction when the movement amount PSE is reset. Since it is determined according to the position and the command value, the amount of movement of the detent plate 90 without causing the driver to feel a sense of incongruity due to the operation (locking) of the mechanical parking lock mechanism 102 or the generation of noise due to the operation release The PSE can be reset.

  That is, when neither the shift position immediately before the instantaneous interruption stored in the SRAM 50 nor the command value is P, the detent plate 90 is rotated to the D wall contact position where the wall surface 94d is brought into contact with the positioning roller 96 to move the movement amount PSE. = PDW is reset, but it is highly possible that the mechanical parking lock mechanism 102 is released from the position other than the P position even after the momentary break recovery, so the detent plate 90 is moved to the D wall contact position. However, the possibility that the operating state of the mechanical parking lock mechanism 102 changes is small, and the movement amount PSE can be reset without causing the driver to feel uncomfortable.

  When the shift position immediately before the momentary interruption stored in the SRAM 50 is P or D and the command value is P or D, the wall side 94p if the command value is P, that is, if the command value is P. If the command value is D on the P wall side that is in contact with the positioning roller 96, the detent plate 90 is rotated to the wall contact position on the D wall side where the wall surface 94d is in contact with the positioning roller 96. The movement amount PSE is reset to 0 or PDW. If the command value immediately before the instantaneous interruption is P, the vehicle is highly likely to stop even if the actual shift position is other than P, that is, D. Even if the movement amount PSE is reset by moving to the P wall contact position, the mechanical parking lock mechanism 102 is appropriately operated and there is almost no possibility of generating abnormal noise or the like. If the command value immediately before the momentary interruption is D, the actual shift position is the P position, and the mechanical parking lock mechanism 102 is used when the detent plate 90 is moved to the D wall contact position and the movement amount PSE is reset. Even if it is released, the release of the mechanical parking lock mechanism 102 is intended by the driver, so there is no possibility of causing the driver to feel uncomfortable.

  In addition, when the command value immediately before the momentary interruption stored in the SRAM 50 is P, the detent reaches the P wall contact position where the wall surface 94p is brought into contact with the positioning roller 96 regardless of the shift position immediately before the momentary interruption stored in the SRAM 50. The movement amount PSE = 0 is reset by rotating the plate 90. However, since the vehicle is highly likely to stop even if the actual shift position is other than the P position, the mechanical parking lock mechanism 102 is There is almost no risk of abnormal noise being generated properly.

  Further, when the command value immediately before the momentary interruption stored in the SRAM 50 is D, the detent reaches the D wall contact position where the wall surface 94d is brought into contact with the positioning roller 96 regardless of the shift position immediately before the momentary interruption stored in the SRAM 50. The movement amount PSE = PDW is reset by rotating the plate 90. However, when the actual shift position is the P position and the detent plate 90 is moved to the D wall contact position, the movement amount PSE is reset. Even if the mechanical parking lock mechanism 102 is released, since the release of the mechanical parking lock mechanism 102 is intended by the driver, there is no possibility that the driver will feel uncomfortable.

  Further, when the shift position immediately before the instantaneous interruption stored in the SRAM 50 is P and the command value immediately before the instantaneous interruption stored in the SRAM 50 is R or N, the P wall contact position where the wall surface 94p is brought into contact with the positioning roller 96. The detent plate 90 is rotated until the movement amount PSE = 0 is reset, but the vehicle is likely to stop even if the actual shift position is other than the P position. There is almost no fear that the noise 102 is appropriately operated to generate an abnormal noise or the like.

  As mentioned above, although the Example of this invention was described in detail based on drawing, this is an embodiment to the last, and this invention is implemented in the aspect which added various change and improvement based on the knowledge of those skilled in the art. Can do.

10: Automatic transmission 34: Electric actuator (movement device) 40: Parking switch (shift selection switch) 42: Shift lever position sensor (shift selection switch) 48: SBW-ECU 50: SRAM (shift state storage device) 80: Rotary Encoder (movement amount detection device) 90: Detent plate (shift member) 94p, 94d: Wall surface (movement end defining member) 102: Mechanical parking lock mechanism 140: Shift switching means 142: Movement amount resetting means P _SH , P _P : Shift position command value

Claims (3)

The automatic transmission is in the power transmission cut-off state and the parking P position for operating the mechanical parking lock mechanism, the R position for enabling the automatic transmission to be driven backward, and the automatic transmission in the power transmission cut-off state N A shift member that is moved in that order to at least four shift positions of a position and a D position that allows the automatic transmission to be driven forward;
A moving end defining member that respectively defines the moving ends of the shift member on the P position side and the D position side;
A shift device that can reciprocate the shift member between the P-position side moving end and the D-position side moving end according to an electrical signal, and can stop the shift member at an arbitrary position;
A movement amount detection device for detecting a relative movement amount of the shift member;
A shift selection switch for outputting a command value representing a shift position selected by the driver from the four or more shift positions;
The movement amount detected by the movement amount detection device with either the P-position side moving end or the D-position side moving end as a reference position so as to move the shift member to the shift position represented by the command value. Shift switching means for controlling the moving device based on:
In a shift switching control device for a vehicle automatic transmission having
A shift state storage device that sequentially stores the current shift position of the shift member and the command value, and that can retain the stored contents even when the power is turned off,
When the shift amount of the shift member with respect to the reference position becomes unknown, when the shift position and the command value stored in the shift state storage device are not the P position, the shift member is moved to the D position. A movement amount resetting means for moving to the side movement end and resetting the movement amount of the shift member with respect to the reference position;
A shift switching control device for an automatic transmission for a vehicle. The movement amount resetting means is configured such that the shift position stored in the shift state storage device is the P position or the D position, and the command value stored in the shift state storage device is the P position or the D position. 2. The vehicle according to claim 1, wherein at the time of the position, the shift member is moved to a shift position side moving end represented by the command value, and the movement amount of the shift member with respect to the reference position is reset. Shift control device for automatic transmission. The movement amount resetting means includes:
When the command value stored in the shift state storage device is the P position, the shift member is moved to the P position side moving end wherever the shift position is stored in the shift state storage device, and the reference position Reset the shift amount of the shift member relative to the position,
When the command value stored in the shift state storage device is the D position, the shift member is moved to the D position side moving end wherever the shift position is stored in the shift state storage device, and the reference Reset the shift amount of the shift member relative to the position,
When the shift position stored in the shift state storage device is the P position and the command value stored in the shift state storage device is the R position or the N position, the shift member is moved to the P position side. The shift switching control device for an automatic transmission for a vehicle according to claim 1, wherein the shift member is moved to an end to reset the movement amount of the shift member with respect to the reference position.

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