JP2005009601A - Selection assisting device for automatic transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a selection assisting device for an automatic transmission capable of enlarging a degree of freedom in layout by miniaturizing a select lever while securing the reliability by mechanically connecting the select lever and a range position switching device, and acquiring the select lever control force characteristic in accordance with the demand. <P>SOLUTION: A control stop block 50 is mounted to output the control command to stop the driving control of an electric motor 15 to a motor driving control block 45, when the stop of the operation of the select lever 2 is determined. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to a technical field of a selection assist device for an automatic transmission that assists a driver's select lever operating force in a vehicle equipped with the automatic transmission.
[0002]
[Prior art]
Conventionally, a select lever of an automatic transmission is mechanically connected to a manual valve of the automatic transmission via an operating force transmission means such as a rod or a cable. The operating force of the driver input to the select lever is transmitted to the manual valve via the operating force transmission means, and the range position is switched according to the operation amount (see, for example, Patent Document 1).
[0003]
On the other hand, what uses what is called shift-by-wire technique in which the select lever and the manual valve are electrically connected is known. In this prior art, an actuator that operates a manual valve is provided, and the range position is switched by driving the actuator by changing the rotation operation of the select lever into an electric signal (see, for example, Patent Document 2).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-323559
[Patent Document 2]
Japanese Patent Laid-Open No. 2003-97694 [0006]
[Problems to be solved by the invention]
When the select lever is operated, a mechanical operating reaction force such as friction of the operating force transmission means, resistance of detent, etc. is generated, and thus a large operating force is required. Therefore, in order to reduce the necessary operating force of the driver, it is necessary to set the length of the select lever to a length that can obtain a sufficient lever force.
[0007]
Therefore, the former of the above prior arts has a problem that the shape becomes large due to the length of the select lever, so that there are many restrictions on the installation place and the degree of freedom in layout in the vehicle interior is low.
[0008]
On the other hand, in the latter, the selection lever can be designed shorter by adopting the actuator, and the degree of freedom in layout becomes higher than that in the former. However, since the select lever and the manual valve are not mechanically connected, the range cannot be switched during a failure. Therefore, there are problems in terms of reliability and safety.
[0009]
The present invention has been made paying attention to the above problems, and its object is to secure the reliability by mechanical connection of the select lever and the range position switching device, and to reduce the degree of freedom of layout by downsizing the select lever. It is an object of the present invention to provide a selection assist device for an automatic transmission that can achieve a widening range of the automatic transmission and obtain a select lever operating force characteristic according to demand.
[0010]
[Means for Solving the Problems]
In order to achieve the above-described object, in the automatic transmission select assist device according to claim 1 of the present invention, the input operation force for detecting the input operation force to the select lever connected to the range position switching device of the automatic transmission. A detecting means; an operating position detecting means for detecting an operating position of the select lever; an electric assist actuator for outputting an assisting force for assisting the operating force of the driver to the select lever; and the detected input operating force and operating position. And an assist force control means for outputting a control command for changing the assist force to the assist actuator, and a drive assist control of the assist actuator when it is determined that the operation of the select lever is stopped. And a control stop means for outputting a control command for stopping the control.
[0011]
According to a second aspect of the present invention, there is provided control stop means for determining that the select lever is positioned at the range determination position and outputting a control command for stopping drive control of the assist actuator when it is determined that the operation of the select lever is stopped. Features.
Here, the range fixed position refers to a range position determined by the automatic transmission in advance, such as a P range, an R range, an N range, a D range, and an L range.
[0012]
【The invention's effect】
According to the first aspect of the present invention, while maintaining the mechanical connection between the select lever and the range position switching device, the lever operating force of the driver is assisted by the assist actuator, thereby ensuring reliability and reducing the size of the select lever. The expansion of the layout freedom by can be achieved together.
[0013]
In addition, while maintaining the mechanical connection between the select lever and the range position switching device, the target operation reaction force characteristic setting unit provides a good target operation reaction force characteristic with a sense of moderation to the driver for detent load characteristics, etc. It can be set freely without being affected.
[0014]
Moreover, the durability of the assist actuator and the durability of the system can be improved by stopping the control of the continuous assist actuator.
[0015]
According to the second aspect of the present invention, since the select lever is stabilized at the range fixed position by natural detent force by not being assisted at the range fixed position, it is possible to improve the sense of moderation.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment for realizing a select assist device for an automatic transmission according to the present invention will be described based on examples.
[0017]
(Example)
First, the configuration will be described.
FIG. 1 is a side view showing a configuration of an automatic transmission apparatus according to an embodiment, and FIG. 2 is a perspective view of a main part showing a detailed structure of an assist actuator.
[0018]
The automatic transmission apparatus according to the embodiment mainly includes a select mechanism unit 1, a control cable 8, an assist actuator 9, a control cable 18, an automatic transmission 19, and a control unit (assist force control means) 22. Yes.
[0019]
The selection mechanism unit 1 has a selection lever 2 that is operated by a driver, and is provided, for example, in a center cluster 3 beside the driver's seat. At the upper end of the select lever 2, a select knob 4 is attached for the driver to hold during the select operation. The select lever 2 is rotated about the fulcrum shaft 5 and is set to 100 mm, which is 250 mm shorter than a conventional general select lever.
[0020]
A push-pull control cable 8 is connected to the lower end of the select lever 2 via a select lever joint 7. The control cable 8 is rotatably connected to the input lever 10 of the assist actuator 9 via the input lever joint 11. That is, the rotational movement of the select lever 2 is converted into a linear movement, and the operating force generated by the operation of the select lever 2 is transmitted to the input lever 10.
[0021]
The input lever 10 is connected to an output lever 13 via an output shaft 12 that is rotatably provided. The output shaft 12 is provided with a worm gear 14 that meshes with a motor output shaft 16 of an electric motor 15 having a speed reduction mechanism.
[0022]
A push-pull control cable 18 is connected to the output lever 13 via an output lever joint 17. The control cable 18 is connected to the control arm 20 of the automatic transmission 19. That is, the rotational movement of the output lever 13 is converted into a linear movement by the control cable 18, and the combined force of the driver's operating force and the driving force of the electric motor 15 is transmitted to the control arm 20 of the automatic transmission 19.
[0023]
The output shaft 12 is provided with a torque sensor (input operation force detection means) 21 that detects distortion (twist) generated between the input lever 10 and the worm gear 14. The operation force signal detected by the torque sensor 21 is amplified by an amplification amplifier (not shown) and transmitted to the control unit 22 via the wire harness 23. Based on the detection signal of the torque sensor 21, the operation force in the select lever operation can be estimated.
[0024]
A contact 24 for position detection is attached and fixed to the worm gear 14. The contactor 24 rotates integrally with the worm gear 14 and makes electrical contact with a carbon resistor printed on a substrate (not shown), thereby outputting a voltage signal corresponding to the stroke angle of the select lever 2 to the control unit 22. . The contactor 24 and the carbon resistance constitute a potentiometer (operation position detecting means) 25.
[0025]
The potentiometer 25 detects the stroke angle of the select lever 2 at any time with the angle when the select lever 2 is stopped at the P range position as the base point angle.
[0026]
The control unit 22 sets a target assist force based on the detected stroke angle of the select lever 2 and the operation force of the driver, and performs PWM control on the output duty ratio of the electric motor 15.
[0027]
FIG. 3 shows a control block diagram of the control unit 22.
The change in the stroke of the select lever 2 that has been subjected to the range switching operation in the select mechanism unit 1 is input to the potentiometer 25 of the assist actuator 9 via the control cable 8. The potentiometer 25 detects a stroke angle corresponding to the operation amount of the select lever 2 and outputs it to the control unit 22 as a stroke angle signal.
[0028]
Further, the operating force of the select lever 2 is input to the torque sensor 21 of the assist actuator 9 via the control cable 8. The torque sensor 21 detects the operation force of the select lever 2 and outputs it to the control unit 22 as an operation force signal.
[0029]
The operation speed determination unit 51 calculates a differential value from the stroke angle signal and outputs it to the position / operation start / direction determination block 33.
[0030]
The position / operation start / direction discriminating block 33 determines the current stroke angle of the select lever 2 based on the stroke angle signal. Further, the operation start, the operation direction, the operation speed, and the operation acceleration of the select lever 2 are determined from the stroke angle signal, the differential value of the stroke angle signal, and the operation force signal, and the determination results are obtained from the FF compensation table 43 and the target table block 34. Output to the motor drive control block 45.
[0031]
In the control stop block 50, the electric motor is determined based on whether or not the operation is determined based on the differential value of the operation force signal from the position / operation start / direction determination block 33 and the range position determined from the stroke angle signal of the select lever 2. 15 drive stop signals are output.
[0032]
In the target table block 34, the target operation reaction force corresponding to the stroke angle of the select lever 2 is calculated from the stroke angle signal and the operation direction of the select lever 2 obtained by the position / operation start / direction determination block 33. It is output to the adder 35.
[0033]
Here, since the target operation reaction force varies depending on the stroke angle of the select lever 2, the target operation reaction force for each stroke angle is stored in a table in the target table block 34.
[0034]
The adder 35 calculates the deviation between the operation force signal and the target operation reaction force, and outputs the calculation result to the FB control unit 36.
[0035]
The FB control unit 36 includes a multiplier 37, an adder 38, a multiplier 39, and an integrator 40. The multiplier 37 outputs a value obtained by multiplying the deviation between the operation force signal and the target operation reaction force by a proportional gain to the adder 38 (proportional output). The multiplier 39 outputs a value obtained by multiplying the deviation between the operation force signal and the target operation reaction force by an integral gain to the integrator 40. The integrator 40 integrates the output of the multiplier 39 and outputs it to the adder 38 (integration output). The adder 38 outputs a feedback assist force that is the sum of the proportional output and the integral output to the adder 41.
[0036]
The FF control unit 42 includes an FF compensation table block 43 and a multiplier 44. The FF compensation table block (corresponding to the target assist force characteristic estimation unit and the weight setting unit) 43 outputs values set in advance corresponding to the stroke angle signal, the operation speed, and the operation acceleration to the multiplier 44. The multiplier 44 outputs a value obtained by multiplying the FF assist force by the FF gain, that is, a feed forward assist force to the adder 41.
[0037]
The adder 41 outputs the output sum (feedback assist force + feed forward assist force) of the FB control unit 36 and the FF control unit 42, that is, the target assist force, to the motor drive control block 45.
[0038]
A motor drive control block (corresponding to an assist force control unit) 45 drives the electric motor 15 based on the target assist force.
[0039]
Next, the detent structure of the automatic transmission 19 will be described.
FIG. 4 is a perspective view showing a detent structure of the automatic transmission 19.
The control arm 20 is provided with a rotation shaft 26, and a detent plate 27 is supported on the rotation shaft 26. At the upper end of the detent plate 27, a valley portion 27b corresponding to five ranges (P, R, N, D, and L) is formed between the cam peaks 27a. Then, the detent pin 29 formed at the tip of the spring plate 28 is engaged with the valley portion 27b and the selected range position is maintained, thereby preventing an unintended range select due to vehicle vibration or the like. Yes.
[0040]
That is, the rotating shaft 26 is rotated by the operating force of the select lever 2, and the detent plate 27 is moved relative to the detent pin 29 in accordance with the rotation. At this time, the detent pin 29 gets over the cam crest 27 a and engages with the valley portion 27 b corresponding to the adjacent range, and the engaged state is held by the elastic force of the spring plate 28. This elastic force becomes a main load force when the select lever 2 is operated.
[0041]
Note that one end of the parking pole 30 is rotatably connected to the detent plate 27. When the select lever 2 is moved to the P range, the parking pole 30 prevents rotation of the parking gear 32 via the cam-like plate 31 and locks driving wheels (not shown). Thereby, when the vehicle is parked on the slope road in the P range, a vehicle load is applied so as to lock the driving wheel according to the slope, and acts as a force for biting the parking pole 30.
[0042]
Next, the operation will be described.
[Select lever assist control processing]
FIG. 5 is a flowchart showing a flow of assist control processing of the select lever 2 executed by the control unit 22.
[0043]
In step S1, the operation force is read from the operation force signal of the torque sensor 21, and the process proceeds to step S2.
[0044]
In step S2, the stroke angle is read from the stroke angle signal of the potentiometer 25, and the process proceeds to step S3.
[0045]
In step S3, the operation direction of the select lever 2 is calculated from the stroke angle of the select lever 2 and the increase / decrease difference between the stroke angles read in the previous control cycle, and the process proceeds to step S4.
[0046]
In step S4, the operation speed of the select lever 2 is calculated from the stroke angle of the select lever 2 and the change rate of the stroke angle read in the previous control cycle, and the operation acceleration of the select lever 2 is calculated from the differential value of the operation speed. Then, the process proceeds to step S5.
[0047]
In step S5, an FF compensation table reading process is performed, and the process proceeds to step S6. The optimum FF compensation table is selected from a plurality of preset tables according to the stroke angle, the operation speed, and the operation acceleration.
[0048]
In step S6, target table reading processing is performed, and the process proceeds to step S7.
[0049]
In step S7, the FF assist force is set from the read FF compensation table, and the process proceeds to step S8.
[0050]
In step S8, the FB assist force is set from the read target table, and the process proceeds to step S9.
[0051]
In step S9, the target assist force is set from the sum of the set FF assist force and FB assist force, and the process proceeds to step S10.
[0052]
In step S10, the output duty ratio of the electric motor 15 is controlled so as to achieve the target assist force.
[0053]
In step S11, an assist control stop process is performed, and this control is terminated.
[0054]
[Operation reaction force characteristics of automatic transmission]
FIG. 6 is a characteristic diagram showing an operation reaction force generated in the select lever 2 in the P → R range direction, more precisely, the select knob 4 held by the driver. This operation reaction force characteristic is an axis detected as an operation reaction force on the output shaft 12 of the assist actuator 9 when the driver operates the select lever 2 in the P → R range direction without driving the electric motor 15. The torque is converted as an operation reaction force Fm [N] generated in the select knob 4 and compared with the stroke angle acquired by the potentiometer 25.
[0055]
This operation reaction force is a combination of the load force generated by the detent of the automatic transmission 19 described above and the frictional force of the control cables 8 and 18 and the inertia of the electric motor 15. That is, in order to perform range switching in the absence of the assist force by the electric motor 15, a manual operation force greater than the operation reaction force Fm is required.
[0056]
As shown in FIG. 6, the operation reaction force Fm generated when the select lever 2 is operated in the P → R range direction is initially opposite to the operation direction of the select lever 2 (D → N range) between the ranges. Direction), changes direction after the peak, occurs in the same direction as the operation direction (P → R range direction), and converges to zero near the range switching position (stop position). This characteristic is caused by the load force generated when the detent pin 29 gets over the cam crest 27 a of the detent plate 27. That is, until the detent pin 29 gets over the cam mountain 27a, a resistance force is generated by the urging force of the spring plate 28, and after the detent pin 29 gets over the cam mountain 27a, the detent pin 29 moves to the next cam mountain 27a. This is because a pulling force (inertial force) is generated by falling into the groove.
[0057]
[Target operation reaction force characteristics]
FIG. 7 is a characteristic diagram showing the target operation reaction force of the select lever 2 in the P → R range direction. This target operation reaction force characteristic is obtained by presetting a target operation reaction force Ft [N] that provides a good operation characteristic with a sense of moderation for the driver according to the stroke angle of the select lever 2.
[0058]
[FF control assist force map]
FIG. 8 is an assist force map in the P → R range direction in the FF control. In this assist force map, an operation force that is approximately ½ of the detent operation reaction force in FIG. 6 is assisted by the FF control according to the stroke angle of the select lever 2.
[FF control + FB control]
In the embodiment, the assist force is a deviation between the feed forward assist force Fff [N] set so as to be an operation force that is about ½ of the detent operation reaction force, and the actual operation force and the target operation reaction force Ft. By using two components of the feedback assist force FFb [N] set on the basis of this, it is possible to achieve both responsiveness and disturbance suppression performance at a high level in the assist control of a select lever with a steep and large torque deviation, which is excellent. Operation characteristics can be realized.
[0059]
[Electric motor drive for assist]
Here, driving of the electric motor for assisting the operation force will be described.
In the select assist device for the automatic transmission of this embodiment, the electric motor 15 is controlled in accordance with the input of the torque sensor 21. Since the operation force can be reduced by assisting the operation force, the electric motor 15 is operated by the control even with a minute output value of the torque sensor 21. However, the continuous driving of the electric motor 15 gives a problem to the durability of the electric motor 15 and the system.
[0060]
[Assist control stop processing]
FIG. 9 is a flowchart showing a flow of control stop processing performed in step S11 of FIG.
[0061]
In step S101, it is determined whether or not the operation of the select lever 2 is stopped based on the operation speed of the select lever 2 obtained from the differential value of the stroke angle signal. If it is stopped, the process proceeds to step S102, and is not stopped. In this case, the process proceeds to step S104.
[0062]
In step S102, it is determined from the position of the select lever 2 obtained from the stroke angle signal whether or not the position of the select lever 2 is in the range determined position. If it is in the range determined position, the process proceeds to step S103 to reach the range determined position. If not, the process proceeds to step S104.
[0063]
In step S103, a control stop signal for stopping the drive of the electric motor 15 is output to the motor drive control block 45, and the process ends.
[0064]
In step S104, the process is terminated without stopping the driving of the electric motor 15.
[0065]
[About range fixed position]
Here, the range determination position of the present embodiment will be described. The fixed position of the select lever 2 on the transmission may be called one point with a very narrow range. However, the position appearing on the potentiometer 25 has a certain range due to cable loss. Accordingly, the range determination position is determined as a value having a certain range (range determination position 601 in FIG. 10) as shown in FIG.
[0066]
[Durability improvement]
(1) When the select lever is being operated In this embodiment, when the select lever 2 is being operated, it is determined that the select lever 2 is being operated based on the operation speed of the select lever 2 in the process of step S101, as shown in the process of step S104. In addition, the drive of the electric motor 15 is maintained.
(2) When the select lever operation ends In this embodiment, the select lever 2 is operated to switch to another range fixed position (P range → R range). When the operation is completed, the operation is stopped by the process of step S101. It is determined that the select lever 2 is at the shift confirmed position by the process of step S102. Thereby, the drive of the electric motor 15 is stopped by the process of step S103.
Since the operation time of the select lever 2 is very short, the motor drive control is stopped by the process of step S103 when the operation is stopped at the range determination position. It is very advantageous in terms of wear and the like, and is also advantageous in terms of heat and other loads such as a control circuit for controlling the electric motor 15. For this reason, durability will be improved.
[0067]
[Improved moderation]
Furthermore, in the embodiment, since the assist control by the electric motor 15 is stopped at the range determination position, the original detent force (necessary operating force shown in FIG. 6) is applied to the select lever 2, so that the selection lever 2 moves toward the range determination position. Increases the sense of moderation because the suction force becomes stronger.
[0068]
[Resume control]
The restart of the control after the drive of the electric motor 15 is stopped by the control stop process of this embodiment will be described.
FIG. 11 is an explanatory diagram of a map for determining resumption of control in the present embodiment. The right side from the center position indicates that the operation speed increases in the direction from the P range to the D range. The left side from the center position indicates that the operation speed increases in the direction from the D range to the P range.
Further, in FIG. 11, the upper side from the center position indicates that the operation reaction force increases in the direction from the P range toward the D range. The lower side from the center position indicates that the operation reaction force increases in the direction from the D range to the P range.
[0069]
When the select lever 2 is operated in the direction from the P range to the D range from any range determination position 601, the operation speed of the select lever 2 exceeds a predetermined value as shown in FIG. 10 (operation speed ≧ Vb) and when the operation reaction force exceeds a predetermined value (operation reaction force ≧ Tb), the control is resumed.
Similarly, when the select lever 2 is operated from any range confirmation position 601 in the direction from the D range to the P range, the operation speed of the select lever 2 exceeds a predetermined value as shown in FIG. When the operation speed ≧ Va) and the operation reaction force exceeds a predetermined value (operation reaction force ≧ Ta), the control is resumed.
Thus, in this embodiment, the re-operation is determined from the operation direction, operation speed, and reaction force of the select lever 2, and the control is resumed. Since the re-operation is determined from both the operation speed and the reaction force, the re-operation can be determined more reliably and the control can be resumed accurately.
[0070]
Next, the effect will be described.
In the automatic transmission select assist device of the present embodiment, the following effects can be obtained.
[0071]
(1) The select lever 2 has a projection amount of about 150 mm less than the conventional select lever, and the select lever 2 and the control arm 20 are connected via the control cables 8 and 18. The degree of freedom of the interior layout of the vehicle is greater than that of the product, and the select lever 2 can be set at an arbitrary position in the vehicle interior such as an instrument panel.
Further, since the select lever 2 and the control arm 20 are mechanically connected by the control cables 8 and 18, even when the assist actuator 9 or the control unit 22 fails, the driver can manually switch the range position. Safety can be secured.
[0072]
Further, since the control stop block 50 for outputting a control command for stopping the drive control of the electric motor 15 to the motor drive control block 45 when the operation stop of the select lever 2 is determined is provided, the drive of the electric motor 15 is intermittently performed. The durability of the motor 15 and the system can be improved.
[0073]
(2) A control stop block that outputs to the motor drive control block 45 a control command for stopping the drive control of the electric motor 15 when it is determined that the select lever 2 is positioned at the range determination position 601 and it is determined that the operation of the select lever 2 is stopped. Since 50 is provided, by not being assisted at the range determination position, the select lever 2 is stabilized at the range determination position by a natural detent force, so that a sense of moderation can be improved.
[0074]
(Other embodiments)
As described above, the embodiments of the present invention have been described based on the examples. However, the specific configuration of the present invention is not limited to the examples, and there are design changes and the like without departing from the scope of the invention. However, it is included in the present invention.
For example, in the embodiment, the torque sensor 21 is used as the input operation force detection means for detecting the input operation force of the select lever 2, but the input operation force is determined from the supply current value to the electric motor 15, the rotation speed of the electric motor 15, and the like. It is good also as a structure which estimates.
In the embodiment, the configuration in which the select lever 2 and the control arm 20 of the automatic transmission 19 are connected by the control cables 8 and 18 is shown. However, the operation force transmitting means for transmitting the operation force of the select lever 2 to the control arm 20 is arbitrary. There may be a configuration using a rod or a linkage.
The shape and size of the select lever 2 are arbitrary, and may be a switch shape that can be operated with a fingertip. In addition, the target operation reaction force characteristic is also changed to a characteristic that provides good operation characteristics according to the shape of the select lever 2.
The distribution ratio of the FF assist force Fff and the FB assist force Ffb with respect to the target assist force can be freely set according to the target operation characteristics.
[0075]
In the embodiment, the electric motor is used as the assist actuator, but another actuator may be used.
In the embodiment, FF + FB control is used as the main controller, but a main controller as shown in FIG. 12 that performs other control may be used.
[Brief description of the drawings]
FIG. 1 is a side view showing a configuration of an automatic transmission according to an embodiment.
FIG. 2 is a main part perspective view showing a detailed structure of an assist actuator.
FIG. 3 is a control block diagram of a control unit.
FIG. 4 is a perspective view showing a detent structure of the automatic transmission.
FIG. 5 is a flowchart showing a flow of select lever assist control processing executed by the control unit;
FIG. 6 is a characteristic diagram showing an operation reaction force generated in the select lever in the P → R range direction.
FIG. 7 is a characteristic diagram showing a target operation reaction force of the select lever in the P → R range direction.
FIG. 8 is an FF assist force map in a P → R range direction.
FIG. 9 is a flowchart showing a flow of assist control stop processing executed by the control unit.
FIG. 10 is an explanatory diagram of a range determination position.
FIG. 11 is an explanatory diagram showing determination details of control resumption.
FIG. 12 is a control block diagram of a control unit that performs another assist control.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Select mechanism part 2 Select lever 3 Center cluster 4 Select knob 5 Support shaft 7 Select lever joint 8 Control cable 9 Assist actuator 10 Input lever 11 Input lever joint 12 Output shaft 13 Output lever 14 Worm gear 15 Electric motor 16 Motor output shaft 17 Output Lever joint 18 Control cable 19 Automatic transmission 20 Control arm 21 Torque sensor 22 Control unit 23 Wire harness 24 Contactor 25 Potentiometer 26 Rotating shaft 27 Detent plate 27a Cam mountain 27b Valley 28 Spring plate 29 Detent pin 30 Parking pole 31 Cam shape Plate 32 Parking gear 33 Direction discrimination block 34 Target table block 35 Adder 36 FB control unit 37 Multiplier 38 Adder 39 the multiplier 40 integrator 41 adder 42 FF controller 43 FF compensation table block 44 the multiplier 45 the motor drive control block 50 controls stop block 51 the operation speed determining unit 221 main controller 601 range settling position

Claims (2)

An input operation force detecting means for detecting an input operation force to the select lever connected to the range position switching device of the automatic transmission;
An operation position detecting means for detecting an operation position of the select lever;
An electric assist actuator that outputs an assist force that assists the operating force of the driver to the select lever;
An assist force control means for outputting a control command for changing the assist force to the assist actuator based on the detected input operation force and operation position;
A selection assist device for an automatic transmission having
A selection assist device for an automatic transmission, comprising: control stop means for outputting a control command for stopping drive control of the assist actuator when it is determined that the operation of the select lever is stopped. In the automatic transmission select assist device according to claim 1,
Selective assist for an automatic transmission comprising control stop means for outputting a control command for stopping drive control of the assist actuator when it is determined that the select lever is positioned at the range fixed position and operation of the select lever is determined to be stopped apparatus.

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