JP3477798B2 - Electric range change device for automatic transmission - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric range changer for operating a drive motor in an automatic transmission of a vehicle by operating an electric switch.

[0002]

2. Description of the Related Art Conventionally, an electric range switching device detects a change in position of a drive system to judge a range position, and when a target range is entered, a braking force is generated in a motor so that the target range position is reached. It is configured to stop the manual shaft (see, for example, Japanese Examined Patent Publication No. 63-37729).

That is, the motor is operated by operating an electric switch (range select switch), the electromagnetic brake is operated by the output of the sensor, and the motor is stopped to control the manual valve to a predetermined range. Type range changers have been proposed.

Further, such an electric range switching device utilizes the shape of the detent lever to judge the range position by the sensor output value when the manual shaft falls from the peak to the valley of the detent and the rate of change thereof. ing.

That is, the current range position is judged from the sensor output value, and when it enters the target range range, it falls to the valley of the detent (the center of the hydraulic pressure generation angle) due to the rate of change of the sensor output value. Then, the braking force is generated in the motor to stop the manual shaft at the target range position.

Further, for example, as shown in FIG. 8, the output voltage value from the valve position sensor, the time required for range stop position rather short, especially pronounced in the N range and the D range or the like.

[0007]

However, the power source (battery) mounted on the vehicle is not necessarily the same, and the vehicle is mounted on the vehicle in order to adjust the range position of the electric range switching device of the automatic transmission. A reference potential (for example, 2.5 V in the N range) has to be adjusted, which causes a problem that the mountability is extremely poor.

Further, as described above, the output voltage value from the valve position sensor has a shorter required time at the range stop position, and is a few msec particularly in the N range and the D range. Will be difficult.

In order to solve the above problems, the present invention provides
To provide an electric range switching device for an automatic transmission that corrects range position detection by a valve position sensor by learning and corrects range position variation of each vehicle and range position variation due to sensor aging. With the goal.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to an automatic transmission that switches a range by controlling a manual valve in an automatic transmission by a range select switch operated by a driver. In an electric range switching device for a machine, a motor driven by the range select switch, a speed reducer interlocked with the motor, a manual shaft connected to the speed reducer, and the manual shaft attached to the manual shaft, A detent mechanism for controlling, a valve position sensor for detecting a change in a rotational position of the detent mechanism, and a rate of change of an output voltage value of the valve position sensor are compared with a predetermined reference value, and the manual shafts are respectively Range of
It is determined that the valve position is within the range, and the valve position
Be in each range position based on the output voltage value of the sensor
And means for controlling determines the motor, a memory for sequentially storing an output voltage value according to the range position of each said valve position sensor outputs, the output voltage <br/> pressure value stored in the memory Means for learning, means for correcting the learned voltage value stored in the memory as a new output voltage value corresponding to the range position, and the valve position sensor detected.
Depending on the voltage value
Judge whether the position has passed, and if so, perform the above
Duty control of the drive voltage of the data
The manual shaft stop time at the
A utility control means is provided.

Further, the correction of the voltage value corresponding to the range position is executed every predetermined number of times of turning on / off the ignition switch.

[0012]

The function and effect of the present invention are as described above .
In order to secure a certain time for stopping the shaft,
Indeed, the voltage value corresponding to each range position is detected, so
Learning correction is also performed accurately .

Further , the valve position sensor detects the voltage value corresponding to each range position and corrects the voltage value, so that it is not necessary to adjust the reference potential when the vehicle is mounted, and the mountability is improved. Get better.

Furthermore, even if the voltage of the power source (battery) changes due to deterioration with age, etc.
It is possible to set the voltage corresponding to the range position that always matches the voltage of the power supply (battery).

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram of an electric range switching device for an automatic transmission showing an embodiment of the present invention, FIG. 2 is a schematic block diagram of an electric range switching system for the automatic transmission, and FIG. FIG. 4 is a configuration diagram of a drive unit of the electric range switching device of the automatic transmission, FIG. 4 is an exploded perspective view of the electric range switching device of the automatic transmission, and FIG. 5 is a detent mechanism of the electric range switching device of the automatic transmission. It is a block diagram of.

In these figures, 1 is an automatic transmission (A
/ T), and a motor 2 as an actuator for driving a range switching device of the automatic transmission is attached to one side surface of the automatic transmission (A / T) 1. The motor 2 is provided with a speed reducer 3 including a worm gear 61. The output shaft of the speed reducer 3 is connected to a manual valve lever shaft (herein referred to as a manual shaft) 5 via a backlash coupling mechanism 4.

The other end of the manual shaft 5 is supported on the other side surface of the automatic transmission (A / T) 1, and a neutral start switch 24 is attached to the other end of the manual shaft 5. A valve position sensor 23 is attached to the end of the manual shaft 5 that penetrates the reduction gear case 60. This valve position sensor 2
Reference numeral 3 outputs the rotational displacement of the manual shaft 5, that is, the change in the rotational position of the detent mechanism 7, as a voltage.

A power source 20 can be connected to the motor 2, and the drive voltage of the motor 2 is detected by a voltmeter 21. Further, the ambient temperature of the manual valve 11 provided in the automatic transmission (A / T) 1, that is, the oil temperature is detected by the oil temperature sensor 22.

Further, a range select switch 41 (lever switch, push button switch, rotary switch, etc.) is arranged near the handle 40. Further, an ignition switch 38 and a starter motor 39 driven by the ignition switch 38 are provided.

The above-mentioned voltmeter 21, oil temperature sensor 22, valve position sensor 23, neutral start switch 2
4, the output signals of the ignition switch 38 and the range select switch 41 are connected to the electronic control unit 30 for range switching control.

This range switching control electronic control unit 30
Is provided with a central processing unit (CPU) 31, a ROM 32 containing a program, a memory 33 for storing various kinds of information described later, a drive signal generator 34, an input / output interface 35, and the like. Output interface 3
The output signals from the voltmeter 21, the oil temperature sensor 22, the valve position sensor 23, and the neutral start switch 24 are taken in through 5.

On the other hand, via the input / output interface 35, output signals can be transmitted to the motor 2, the shift lock solenoid 36 for locking the operating members of the range select switch 41, and the warning device 37 for reverse and parking. ing.

A substantially repellent detent lever 6 is fixed to the manual shaft 5, and a detent mechanism 7 is provided on the outer peripheral surface thereof. That is, as shown in FIG. 5, the cutouts P, R, N, D, 2, and L are sequentially arranged from the right side.
The rollers 9 provided at the tip of the detent spring 8 engage with the notches to detent the P range, R range, N range, D range, 2 range, and L range, respectively. It is configured. Incidentally, 6a is a mounting hole for the manual shaft 5 formed in the detent lever 6, and 6b is a mounting hole for a rod connected to the parking mechanism formed in the detent lever 6.

Therefore, if the ignition switch 38 is turned on while the main switch is turned on and the neutral switch is turned on, as in the conventional case, the valve position sensor 23 is in a state in which the engine can be started. , The starter motor 39 operates and the engine is started.

In this case, the range select switch 4
Turn on the drive (D) switch of 1. Then, a current is supplied from the power source 20 to the motor 2, and the motor 2 rotates, thereby driving the reduction gear 3 including the worm gear 61, and rotating the manual shaft 5 via the rattling coupling mechanism 4. The detent lever 6 rotates, and the manual valve 11 in the valve body 10 is switched according to the rotational displacement. Therefore, the line pressure P _L is switched to the D range port.

As described above, the manual valve 11 can be switched to each port according to the rotational displacement of the detent lever 6, and accordingly, the shift shift valve 17 is switched by the control of the transmission control electronic control unit 50. As a result, a combination of the friction engagement elements 18 corresponding to each range is established. In addition, 19 is a solenoid.

Explaining the parking mechanism 14, the rod 12 connected to the detent lever 6 is displaced according to the rotational displacement of the detent lever 6, and the shape of the cam 13 formed at the tip of the rod 12 is changed. Accordingly, the parking pole 15 is rotatably arranged, and in the P range, the claw 15a of the parking pole 15 is
The parking gear 16 is locked by meshing with the recess 16a of the parking gear 16.

Here, the electric range switching device of the automatic transmission utilizes the detent mechanism 7 to control the range switching of the output value of the valve position sensor 23 when the manual shaft 5 falls from the peak to the valley of the detent. Electronic control unit 3
The change rate is calculated by the central processing unit (CPU) 31, and the range position is determined by the change rate. That is, the current range position is determined by the output value of the valve position sensor 23, and when the current range position is entered, based on the rate of change of the output value of the valve position sensor 23, the valley of the detent (the oil pressure generation angle When it is determined that the manual shaft 5 has fallen to the center, the braking force is generated in the motor 2 and the manual shaft 5 is stopped at the target range position.

In the present invention, the voltage value corresponding to each range position detected by the valve position sensor 23 is
A memory 33 for sequentially storing the position switching patronized electronic control unit 30, a means for learning a voltage value stored in the memory 33, the stored learned voltage value in the memory 33, the correction as a new range position corresponding voltage value And means for doing so.

Here, the correction of the voltage value corresponding to the range position is executed every predetermined number of ON / OFF operations of the ignition switch 38, for example, every 100 times.

When the valve position sensor 23 detects a voltage value corresponding to the range position, the drive voltage of the motor 2 is
The duty is controlled by the output signal from the drive signal generator 34, and the manual shaft 5 at each range position is controlled.
The stop time, that is, the time during which the output value of the valve position sensor 23 does not change is secured for a certain time.

FIG. 6 is a timing chart of the output signal of the valve position sensor of the electric range switching device of the automatic transmission according to the embodiment of the present invention.

As shown in FIG. 8, in the conventional example, the output voltage value from the valve position sensor has a shorter required time at the range stop position, and in particular, it is several ms in the N range and the D range.
ec, and it is difficult to judge the range position reliably,
In the present invention, for example, as shown in FIG. 6, the drive voltage of the motor 2 is changed by the output signal from the drive signal generator 34, in particular, from the P range to the D range,
Duty control for 8m at the range stop position
Try to be more than sec.

The operation of the electric range switching device for an automatic transmission according to the embodiment of the present invention will be described below with reference to FIG.

(1) First, it is determined whether or not the ignition switch 38 has been turned on 100 times since the first learning or the previous learning (step S1).

(2) As a result, if the ignition switch 38 has been turned on 100 times or more, it is determined whether or not the R range can be learned (step S2).

(3) As a result, if the R range can be learned, it is determined whether or not a position of 0.5 V (V ₁₂ ) has passed before the R range position (step S3).

(4) As a result, before the R range position,
When the position of 0.5 V (V ₁₂ ) has passed, the motor 2
It is determined whether or not the drive voltage of is under duty control (step S4).

(5) In step S4, if the drive voltage of the motor 2 is not under duty control, the motor 2
Start the duty control of the drive voltage of (step S
5).

(6) Next, it is judged whether or not the R range position detection is completed (step S6).

(7) As a result, when the R range position detection is completed, the duty control of the drive voltage of the motor 2 is completed. When shifting to the next range, the normal valve position sensor 23 is enabled to output, and when the R range position is the target range, the stop control of the motor 2 is performed (step S7).

(8) Next, it is judged whether or not there is a difference of 0.1 V or more from the R range position detection value in step S6 (step S8).

(9) As a result, if there is a difference of 0.1 V or more from the R range position detection value in step S6, the learning value is not adopted and the previous memory 33 is used.
The value stored in is held as it is (step S
9).

(10) In step S8, when there is no difference of 0.1 V or more from the R range position detection value in step S6, the learning value of this time is adopted, and the detection value stored in the memory 33 of the previous time is adopted. Is rewritten to the current learning value (step S10).

(11) In step S2, if the R range is not learnable, it is determined whether the next range, that is, the N range is learnable, and thereafter, the same as in the case of the R range. Run.

Further, the above-mentioned electronic control device is provided as a dedicated one for the electric range switching device of this automatic transmission, or is incorporated in a part of the electronic control device for controlling the entire automatic transmission, Further, it may be incorporated in a part of an electronic control device for controlling the entire motor vehicle having a wide range of control functions for controlling the engine.

The present invention is not limited to the above embodiments, and various modifications can be made based on the spirit of the present invention, and these modifications are not excluded from the scope of the present invention.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a main part of an electric range switching device for an automatic transmission showing an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of an electric range switching system for an automatic transmission showing an embodiment of the present invention.

FIG. 3 is a configuration diagram of a drive unit of an electric range switching device for an automatic transmission according to an embodiment of the present invention.

FIG. 4 is an exploded perspective view of the electric range switching device of the automatic transmission according to the embodiment of the present invention.

FIG. 5 is a configuration diagram of a detent mechanism of the electric range switching device of the automatic transmission according to the embodiment of the present invention.

FIG. 6 is a timing chart of the output signal of the valve position sensor of the electric range switching device of the automatic transmission according to the embodiment of the present invention.

FIG. 7 is an operation flowchart of the electric range switching device of the automatic transmission according to the embodiment of the present invention.

FIG. 8 is a timing chart of output signals of a valve position sensor of a conventional electric range switching device for an automatic transmission.

[Explanation of Codes] 1 Automatic transmission (A / T) 2 Motor 3 Reduction gear 4 Backlash coupling mechanism 5 Manual shaft 6 Detent lever 6a Manual shaft mounting hole 6b Rod mounting hole 7 Detent mechanism 8 Detent spring 9 Roller 10 Valve Body 11 Manual valve 12 Rod 13 Cam 14 Parking mechanism 15 Parking pole 15a Parking pole claw 16 Parking gear 16a Parking gear recess 17 Shift gear shift valve 18 Friction engagement element 19 Solenoid 20 Power supply 21 Voltmeter 22 Oil temperature sensor 23 Valve position Sensor 24 Neutral start switch 30 Electronic control device for range switching 31 Central processing unit (CPU) 32 ROM 33 Memory 34 Drive signal generator 35 Input / output interface 36 Shift lock Solenoids 37 warning device 38 ignition switch 39 starter motor 40 handle 41 range selection switch 50 transmission control electronic control unit 60 reduction gear case 61 worm

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masamichi Unoki 10 Takane, Fujii-cho, Anjo City, Aichi Prefecture Aisin AW Co., Ltd. (56) Reference JP-A-5-203042 (JP, A) Flat 3-194266 (JP, A) JP 63-57950 (JP, A) JP 7-81448 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16H 59 / 00-63/48

Claims (2)

(57) [Claims] 1. An electric range selector for an automatic transmission, which controls a manual valve in an automatic transmission by a range select switch operated by a driver to switch the range, and is driven by the range select switch. Motor, a speed reducer interlocked with the motor, a manual shaft connected to the speed reducer, a detent mechanism attached to the manual shaft for controlling the manual valve, and a change in the rotational position of the detent mechanism are detected. Valve position sensor and a rate of change of the output voltage value of the valve position sensor are compared with a predetermined reference value, and the manual shaft is set in each range.
It is determined that the valve position is within the range, and the valve position
Be in each range position based on the output voltage value of the sensor
And means for controlling determines the motor, a memory for sequentially storing an output voltage value according to the range position of each said valve position sensor outputs, the output voltage <br/> pressure value stored in the memory Means for learning, means for correcting the learned voltage value stored in the memory as a new output voltage value corresponding to the range position, and the valve position sensor detected.
Depending on the voltage value
Judge whether the position has passed, and if so, perform the above
Duty control of the drive voltage of the data
The manual shaft stop time at the
An electric range switching device for an automatic transmission, comprising: a duty control means . 2. The electric range switching device for an automatic transmission according to claim 1, wherein the correction of the voltage value corresponding to the range position is executed every predetermined number of times of turning on / off the ignition switch.