JP2004306861A - Select assist device of automatic transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a select assist device of an automatic transmission which prevents erroneous operation at the high vehicle speed having large affect due to the erroneous operation of a select lever without adding erroneous operation prevention structure to the select lever. <P>SOLUTION: The select assist device is equipped with a torque sensor 12 detecting an input torque to the select lever 2 of the automatic transmission 8, a potentiometer 13 detecting a stroke angle of the select lever 2, an electric motor 7 outputting the assist torque assisting the operation force of a driver, a control unit 14 controlling the assist torque based on the input torque and the stroke angle, and a vehicle speed sensor 23. When the input torque to the select lever 2 at D or R range position is detected, the device outputs the assist torque in the opposite direction to the input torque and lights a warning lamp 24 in the case where the vehicle speed V is larger than a first set vehicle speed V<SB>1</SB>. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a select assist device for an automatic transmission that prevents range switching due to erroneous operation of a select lever during traveling.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a vehicle equipped with a manual transmission, a shift assist device that controls an electric motor for shift assist according to a shift stroke position of a shift lever and a shift operation force is known (for example, Patent Document 1).
[0003]
By the way, when this conventional technology is applied to a select lever of an automatic transmission and assist is performed in accordance with a stroke position and an operating force, the assist force also acts on a driver's erroneous operation, so unexpected range switching is performed. May be asked. Then, the influence of this erroneous operation (for example, a shift shock or the like) increases as the vehicle speed increases.
[0004]
Therefore, as a technique for preventing an erroneous operation of the select lever, there is known a structure in which a plunger of a solenoid is driven so that a metal fitting provided at the tip of the plunger advances and retreats on a track of the select lever (for example, see Patent Document 2). ).
[0005]
That is, the solenoid is controlled by the vehicle speed, and when the vehicle speed is higher than a predetermined constant vehicle speed, the solenoid is driven to move the metal fittings onto the path of the select lever, thereby restricting the movement of the select lever. Even when the button is pressed, erroneous operation of the select lever can be prevented.
[0006]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2002-13634 [Patent Document 2]
Japanese Utility Model Laid-Open Publication No. 7-29355
[Problems to be solved by the invention]
However, in the above-mentioned conventional technology, a solenoid, a control circuit, and the like for controlling the movement of the select lever are required, so that there is a problem that the device becomes complicated and the cost is increased.
[0008]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problem, and has as its object to provide an erroneous operation at a high vehicle speed that is greatly affected by an erroneous operation of the select lever without adding an erroneous operation prevention structure to the select lever. It is an object of the present invention to provide a select assist device for an automatic transmission which can prevent the occurrence of a shift.
[0009]
[Means for Solving the Problems]
To achieve the above object, the automatic transmission select assist device according to the first aspect of the present invention includes an input torque detection unit that detects an input torque to a select lever connected to a range switching device of the automatic transmission. Operating position detecting means for detecting an operating position of the select lever, an assist actuator for outputting an assist torque for assisting a driver's operating force to the select lever, an input torque to the select lever and an operating position of the select lever. And an assist torque control means for controlling an assist torque based on the vehicle speed.A select assist device for an automatic transmission, comprising: a vehicle speed detection means for detecting a vehicle speed of the own vehicle; When the vehicle is running at a high speed, the driver's operating force is higher than when the vehicle is running at a lower speed. Characterized in that a erroneous operation prevention control section that controls the click.
[0010]
According to a second aspect of the present invention, in the select assist device for an automatic transmission according to the first aspect, the erroneous operation prevention control unit stops outputting assist torque.
[0011]
According to a third aspect of the present invention, in the automatic transmission select assist device according to the first or second aspect, the erroneous operation prevention control unit is configured to control the driver's operation when the vehicle speed is equal to or higher than a preset vehicle speed. It is characterized in that the assist torque is controlled so that the operating force is increased.
The “set vehicle speed” refers to a vehicle speed at which a failure may occur when the range is switched at a speed higher than the vehicle speed.
[0012]
According to a fourth aspect of the present invention, in the select assist device for an automatic transmission according to any one of the first to third aspects, the erroneous operation prevention control unit is configured to switch to a select lever located at a D or R range position. When the input torque is detected, the assist torque is controlled so that the driver's operation force is increased.
[0013]
【The invention's effect】
According to the first aspect of the present invention, the assist torque control means controls the assist torque based on the input torque to the select lever and the operation position of the select lever in a normal select operation, and the driver operates the select lever. In order to assist the force, the driver can perform the select operation with a small operation force.
[0014]
On the other hand, the assist torque control means includes an erroneous operation prevention control unit that controls the assist torque so that the driver's operation force is increased when the vehicle speed is high compared to when the vehicle speed is low.
[0015]
Therefore, when the vehicle speed is high, the required operating force of the select lever becomes large, and it is difficult for the select lever to be erroneously operated. It is possible to prevent erroneous operation of the select lever during high-speed running without accompanying up-up.
[0016]
According to the second aspect of the present invention, the erroneous operation prevention control unit stops the output of the assist torque at the time of high-speed running, so that the operation of the select lever becomes more difficult and the erroneous operation of the select lever can be more reliably prevented.
[0017]
According to the third aspect of the present invention, the erroneous operation prevention control unit controls the assist torque so that the driver's operation force is increased when the vehicle speed becomes equal to or higher than the vehicle speed at which there is a risk of failure. Can prevent the occurrence of a failure due to the failure.
[0018]
According to the invention described in claim 4, the N range is selected while the vehicle is traveling in the D range, and it is possible to prevent the engine brake from being ineffective during high speed traveling.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
First, the configuration will be described.
FIG. 1 is a side view showing a configuration of an automatic transmission to which a select assist device for an automatic transmission according to the present invention is applied, and FIG. 2 is a rear view of the automatic transmission.
[0020]
The control unit 1 has a select lever 2 operated by the driver, and is installed, for example, above the center cluster 3 beside the driver's seat. The select lever 2 is set to be operated in the front-rear direction of the vehicle about the fulcrum shaft 4 at the lower end. The length of the select lever 2 is set to about 100 mm, and is designed to be about 250 mm shorter than a conventional general select lever.
[0021]
An upper end of a control lever 5 that rotates vertically with the fulcrum shaft 4 is fixed to the fulcrum shaft 4 of the select lever 2. Further, a sector gear 6 is fixed to the fulcrum shaft 4, and an electric motor (assist actuator) 7 for assisting a driver's operation force is connected to the sector gear 6.
[0022]
The lower end of the control lever 5 is connected via a rod-shaped linkage 11 to the upper end of a control arm 10 of a detent mechanism 9 (see FIG. 3) provided in a front automatic transmission 8. The detent mechanism 9 will be described later.
[0023]
The fulcrum shaft 4 of the select lever 2 includes a torque sensor (input torque detecting means) 12 for detecting an input torque to the fulcrum shaft 4 and a potentiometer (operation position detecting means) 13 for detecting a stroke angle of the select lever 2. Are linked.
[0024]
The torque sensor 12 includes a pair of rotating parts 12a provided on the fulcrum shaft 4 and a detecting part 12b for detecting a torsional torque therebetween. Since the torque sensor 12 is provided on the fulcrum shaft 4 of the select lever 2, it is possible to detect the driver's operation force actually input to the select lever 2. The output voltage of the torque sensor 12 is output to a control unit (assist torque control means) 14 as an input torque signal.
[0025]
Further, the potentiometer 13 detects a stroke angle when the select lever 2 is operated, assuming that the time when the select lever 2 is located at the end of the P range is 0 degree. The output voltage of the potentiometer 13 is output to the control unit 14 as a stroke angle signal.
[0026]
The control unit 14 receives an input torque signal, a stroke angle signal, and a vehicle speed signal from a vehicle speed sensor (vehicle speed detecting means) 23 via the ECU 22. Then, the control unit 14 sets a target which is a target value of the assist torque output by the electric motor 7 based on the detected stroke angle of the select lever 2 and a preset target assist torque map (see FIG. 4). Calculate the assist torque. Then, the target assist torque is corrected according to the actual input torque, and based on the corrected target assist torque, the output duty ratio of the assist torque output from the electric motor 7 is controlled by a PWM (pulse width modulation) method.
[0027]
If the control unit 14 determines that the select lever 2 is erroneously operated based on the vehicle speed signal and the input torque, the control unit 14 performs control to prevent range switching due to erroneous operation and outputs a warning output signal. A warning lamp (warning means) 24 provided on an instrument panel (not shown) is turned on.
[0028]
Next, the structure of the detent mechanism 9 will be described.
FIG. 3 is a perspective view showing the structure of the detent mechanism 9 of the automatic transmission.
A rotating shaft 15 is provided at the lower end of the control arm 10, and a detent plate 16 is supported on the rotating shaft 15. At the upper end of the detent plate 16, valleys 16b corresponding to four ranges (P, R, N, D) are formed between the cam ridges 16a. Then, a detent pin 18 formed at the tip of the spring plate 17 is engaged with the valley portion 16b to maintain the selected range position.
[0029]
That is, by operating the select lever 2 back and forth, the operating force is transmitted to the detent plate 16 via the linkage 11, and the detent plate 16 moves back and forth, so that the detent pin 18 rides over the cam mountain 16a. The valley portion 16b corresponding to the next range is engaged, and the engaged range position is held by the elasticity of the spring plate 17.
[0030]
One end of a parking pole 19 is rotatably connected to the detent plate 16. When the select lever 2 is moved to the P range, the parking pawl 19 prevents rotation of the parking gear 21 via the cam-shaped plate 20 and locks driving wheels (not shown). Thus, when the vehicle is parked in the P range on a slope road, a heavy load is applied so as to lock the drive wheels according to the slope, and acts as a force to bite the parking pole 19.
[0031]
Next, the operation will be described.
[Target assist torque map]
FIG. 4 is a target assist torque map in the P → R range direction. In this target assist torque map, a target assist torque Tmot according to the stroke angle of the select lever 2 is set. The target assist torque Tmot is obtained by subtracting the shaft torque due to the ideal operating force Ft from the shaft torque due to the mechanical load force Fmis. That is, by controlling the assist torque of the electric motor 7 using the target assist torque Tmot as a target value, a shaft torque based on the ideal operating force Ft of the driver, which becomes a favorable operating force at the time of selection, can be obtained.
[0032]
The mechanical load force Fmis is obtained by combining the load force generated by the detent mechanism 9 of the automatic transmission 8 described above with the friction force of the linkage 11, the inertia of the electric motor 7, and the like. In order to perform range switching in a state where there is no operation, an operating force equal to or greater than the shaft torque due to the mechanical load force Fmis is required.
[0033]
When selecting in the D → N range direction, the shaft torque due to the mechanical load force Fmis has a characteristic different from the mechanical load force in the P → R range direction described above. Is also set separately. Therefore, in the assist control of the select lever 2, it is necessary to detect the operation direction of the select lever 2 and to control the assist torque using the target assist torque map corresponding to the operation direction.
[0034]
As a method of detecting the operation direction of the select lever 2 (corresponding to the operation direction detection means), a determination based on the positive / negative output state of the torque sensor 12, a determination based on an increase / decrease difference between the latest acquired value of the potentiometer 13 and the previous acquired value, or , The magnitude of the potentiometer 13 with respect to the median value of each range stop position on the target assist torque map can be determined.
[0035]
A plurality of the target assist torque maps are set in advance according to the operation speed of the select lever 2. The operation speed of the select lever 2 can be estimated from the stroke angle change rate and the like.
[0036]
[Select lever misoperation prevention control processing]
FIG. 5 is a flowchart showing the flow of the select lever erroneous operation prevention control process executed by the control unit 14.
[0037]
In step S101, the vehicle speed V is read from the vehicle speed signal of the vehicle speed sensor 23.
[0038]
In step S102, the input torque is read from the input torque signal of the torque sensor 12.
[0039]
In step S103, it is determined whether the input torque is greater than zero. If the input torque is greater than zero, the process proceeds to step S104, and if the input torque is zero, the control ends.
[0040]
In step S104, it is determined from the stroke angle signal of the potentiometer 13 whether the select lever 2 is in the D or R range position. When the select lever 2 is at the D or R range position, the process proceeds to step S111 in FIG. 6, and otherwise, the process proceeds to step S105.
[0041]
In step S105, the normal operation force assist control described later is executed, and the control ends.
[0042]
FIG. 6 is a flowchart showing the flow of the select lever erroneous operation prevention control process in the D or R range.
[0043]
In step S111, it is determined whether or larger than a first predetermined vehicle speed V ₁ to the vehicle speed V is set in advance. Vehicle speed V advances to step S115. If greater than the first predetermined vehicle speed _{V 1,} the process proceeds to step S112 if the vehicle speed V is first set speed _{V 1} or less. Note that the first predetermined vehicle speed V _1, if the select lever 2 is erroneous when the vehicle speed refers to the speed that could malfunction.
[0044]
In step S112, it is determined whether the vehicle speed V is greater than the second set speed _V 2, which is set in advance _{(0 <V 2 <V 1} ). Vehicle speed V advances to step S114. If greater than the second set speed _{V 2,} the process proceeds to step S113 if the vehicle speed V is a second set speed _{V 2} less. Note that the second predetermined vehicle speed V _2, when the select lever 2 is erroneous when the vehicle speed, but you it is not a failure, such as a large shift shock, a vehicle speed that may vehicle behavior changes abruptly Say.
[0045]
In step S113, normal operation force assist control described later is executed, and the present control ends.
[0046]
In step S114, the output of the electric motor 7 is stopped, a warning output signal is output to turn on the warning lamp 24, and this control is ended (corresponding to an erroneous operation prevention control unit).
[0047]
In step S115, the electric motor 7 is controlled so as to generate the assist torque in the direction of the R → N range, a warning output signal is output to turn on the warning lamp 24, and the control is ended (corresponding to an erroneous operation prevention control unit). ).
[0048]
[Select lever assist control processing]
FIG. 7 is a flowchart showing the flow of the select lever assist control process executed in step S105 of FIG. 5 and step S113 of FIG.
[0049]
In step S201, the stroke angle of the select lever 2 is read from the stroke angle signal of the potentiometer 13.
[0050]
In step S202, the input torque is read from the input torque signal of the torque sensor 12.
[0051]
In step S203, the operation direction of the select lever 2 is calculated from the positive / negative output state of the input torque signal of the torque sensor 12.
[0052]
In step S204, the operation speed of the select lever 2 is calculated from the stroke angle and the change rate of the previously read stroke angle.
[0053]
In step S205, a target assist torque map corresponding to the operation direction and operation speed of the select lever 2 is read.
[0054]
In step S206, the target assist torque is set based on the read target assist torque map and the stroke angle.
[0055]
In step S207, the actual input torque is compared with the target assist torque, and when the difference is equal to or more than a predetermined value, the target assist torque is corrected.
[0056]
In step S208, the electric motor 7 is driven such that the corrected target assist torque is obtained, and the present control ends.
[0057]
[Control action to prevent erroneous operation of the select lever]
(Prevention of erroneous operation from D range to N range)
When the driver erroneous operation of the select lever 2 from the D range position to the N range direction, when the vehicle speed V is greater than a first predetermined vehicle speed V _1, in the flowchart of FIG. 5, step S101 → step S102 → step S103 → The process proceeds to step S104, and then proceeds to step S111 → step S115 in the flowchart of FIG.
[0058]
That is, it is determined in step S103 that the input torque is equal to or greater than zero, and in step S104, it is determined that the select lever 2 is at the D range position.
Subsequently, it is determined that the vehicle speed V is in step S111 of FIG. 6 is larger than the first predetermined vehicle speed V _1, in step S115, N → D range direction, i.e., in a direction that prevents the movement of the select lever 2 of the electric motor 7 The assist torque is output. At this time, the warning lamp 24 lights up, and the driver is warned of an erroneous operation.
[0059]
Moreover, greater than the vehicle speed V and the second set speed _{V 2,} the case where the first predetermined vehicle speed _{V 1} or less, in the flowchart of FIG. 6, the flow proceeds to step S 111 → step S112 → step S114.
[0060]
That is, in step S111 it is determined that the vehicle speed V is first set vehicle speed _{V 1} or less, the vehicle speed V in step S112 is determined to be greater than the second set speed _{V 2,} in step S114 the assist torque by the electric motor 7 The output stops, and the warning lamp 24 lights up.
[0061]
Next, effects will be described.
With the automatic transmission select assist device according to the present embodiment, the following effects can be obtained.
[0062]
(1) When the D range or R range selection while driving lever 2 is erroneous, the vehicle speed V is is larger than the first predetermined vehicle speed V ₁ in a direction that prevents the movement of the select lever 2 of the electric motor 7 By outputting the assist torque, range switching by the driver's operation force is disabled, erroneous operation is reliably prevented, and occurrence of a failure or the like can be avoided.
[0063]
(2) When the select lever 2 is erroneous during running in the D range or R range, when the vehicle speed V is greater than the second set speed V _2, is first set vehicle speed V ₁ or less, the electric motor 7 By stopping the output of the assist torque, the driver can be alerted to deceleration or the like while suppressing the power consumption of the electric motor 7, and erroneous operation accompanied by a sudden change in vehicle behavior can be prevented. At this time, the select lever 2 becomes heavy due to the stoppage of the output of the assist torque. However, if the driver must change the range in order to avoid danger, the range can be changed.
[0064]
(3) When the select lever 2 is erroneous, when the vehicle speed V is greater than the second set speed V _2, for a warning to the driver by lighting a warning lamp 24, operation errors to alert the driver The switching of the range due to is reliably prevented.
[0065]
(Other embodiments)
Although the embodiments of the present invention have been described above, the specific configuration of the present invention is not limited to the embodiments, and even if there is a design change or the like within a range not departing from the gist of the invention, Included in the present invention.
[0066]
For example, in the case when the vehicle speed V is greater than a first predetermined vehicle speed V ₁ is the output of the assist torque is stopped, greater than the vehicle speed V and the second set speed V _2, is first set vehicle speed V ₁ or less May be configured to weaken the output of the assist torque.
[0067]
In addition to the lighting of the warning lamp 24, the warning means may be configured to display a warning of an erroneous operation to the driver, a character requesting deceleration, or a warning by a warning sound or a sound.
[Brief description of the drawings]
FIG. 1 is a side view showing a configuration of an automatic transmission to which a select assist device for an automatic transmission according to the present invention is applied.
FIG. 2 is a rear view showing a configuration of an automatic transmission to which the select assist device for an automatic transmission according to the present invention is applied.
FIG. 3 is a perspective view showing a structure of a detent mechanism of the automatic transmission.
FIG. 4 is a target assist torque map in a P → R range direction.
FIG. 5 is a flowchart illustrating a flow of a select lever erroneous operation prevention control process executed by the control unit.
FIG. 6 is a flowchart showing a flow of a select lever erroneous operation prevention control process in a D or R range executed by a control unit.
FIG. 7 is a flowchart illustrating a flow of a select lever assist control process executed by the control unit.
[Explanation of symbols]
Reference Signs List 1 control unit 2 select lever 3 center cluster 4 fulcrum shaft 5 control lever 6 sector gear 7 electric motor 8 automatic transmission 9 detent mechanism 10 control arm 11 linkage 12 torque sensor 12a rotating unit 12b detecting unit 13 potentiometer 14 control unit 15 rotating shaft 16 Detent plate 16a Cam peak 16b Valley 17 Spring plate 18 Detent pin 19 Parking pole 20 Cam-shaped plate 21 Parking gear 22 ECU
23 Vehicle speed sensor 24 Warning lamp

Claims (4)

Input torque detecting means for detecting an input torque to a select lever connected to a range switching device of the automatic transmission,
Operating position detecting means for detecting an operating position of the select lever;
An assist actuator that outputs an assist torque to assist a driver's operation force to a select lever;
An assist torque control means for controlling an assist torque based on an input torque to the select lever and an operation position of the select lever, and a select assist device for an automatic transmission,
Providing vehicle speed detection means for detecting the vehicle speed of the own vehicle,
The assist torque control means includes an erroneous operation prevention control unit that controls the assist torque so that the driver's operation force is increased when the vehicle speed is high compared to when the vehicle speed is low. Select assist device for automatic transmission. The select assist device for an automatic transmission according to claim 1,
The select assist device for an automatic transmission, wherein the erroneous operation prevention control unit stops output of assist torque. The select assist device for an automatic transmission according to claim 1 or 2,
The select assist device for an automatic transmission, wherein the erroneous operation prevention control unit controls the assist torque so that the driver's operation force is increased when the vehicle speed is equal to or higher than a preset vehicle speed. The select assist device for an automatic transmission according to any one of claims 1 to 3,
The automatic transmission according to claim 1, wherein the erroneous operation prevention control unit controls the assist torque such that when the input torque to the select lever at the D range position or the R range position is detected, the driver's operation force is increased. Machine select assist device.

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