JPS608548A - Speed changing device of automatic speed changer - Google Patents

Abstract

PURPOSE:To prevent an unintended advance of a car by inhibiting an automatic speed changer from being transferred from a parking position to other speed change positions regardless of the operation of a select switch selecting speed change positions of the automatic speed changer while an ignition switch is opened. CONSTITUTION:When a driver pushes the P shift switch of a select switch 1 and opens an ignition switch 65 to depart from a car, a motor 7 is operated by a switching signal from a logical unit 5 via a drive circuit 10, and the manual valve of an automatic speed changer is transferred to P position. In addition, an LED element 59 indicating the P position in a speed change position display circuit 33 is lighted, and a transfer switch 72 is concurrently transferred to the contact point 72a side. Under this condition, even if the select switch is unintendedly operated, the logical unit 5 is kept in an inoperative condition, because an H signal is inputted via an inverter 71 to input terminals on one side of OR circuits 66-70 of an input control circuit 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a transmission device for an automatic transmission in which a shift position of the automatic transmission can be selected by operating a select switch such as a button. .

(Prior Art) Generally, the shift position of an automatic transmission is changed by manually operating a manual switching valve using a floor-type or column-type lever. However, switching the manual valve described above requires a considerable amount of force, which is not desirable considering the increasing number of female drivers and elderly drivers.
However, the lever and the link mechanism connected thereto occupy a considerable amount of space, which is undesirable in terms of enlarging the living space and ensuring freedom in design such as component arrangement.

Therefore, recently, in order to solve the above-mentioned problems, for example, Utility Model Application No. 57-25237, 57-25238, 57-25239, 57-25240, 57-
As shown in the publications of No. 143926, switching of manual valves is performed not by human power but by electromagnetic means such as motors. An automatic transmission has been proposed in which a select switch is provided to change the gear position of the automatic transmission in accordance with the operation of the select switch.

However, while this type of gear has the advantage of being able to easily change the gear position by operating a switch, the gear position can also be easily changed due to a child's prank or careless contact with the select switch. Therefore, some kind of safety measure is desired.

(Objective of Invention 1) The present invention has been made in consideration of the following circumstances, and unless there is a person who knows how to drive at least near the vehicle, the vehicle cannot be moved from the parking position to another position such as the neutral position. In order to achieve the above-mentioned object, the present invention provides a transmission device for an automatic transmission that prevents the vehicle from being shifted to the shift position of the vehicle. Focusing on the fact that the ignition switch is normally closed when the
As shown in FIG. 1, there is a conventional electromagnetic means 7 for manual valve switching of an automatic transmission 4, a controller 2 that controls the operation of the electromagnetic means 7, and a controller 2 that controls the operating position of the electromagnetic means 7. In addition to the select switch 1 that commands, there is also a shift position detecting means 36 that detects that the shift position of the automatic transmission 4 is in the parking position, and upon receiving the output from this shift position detecting means 36, automatic shift is performed. Shift change prohibition means 7 that allows operation of the electromagnetic means 7 by the select switch l only when the machine 4 is in the parking shift position and the ignition switch is closed.
2 and are provided.

With this configuration, from the state where the automatic transmission 4 is set to the parking position, unless the evening switch is closed, the automatic transmission 4 will not return to the parking position even if the select switch 1 is operated. will continue to maintain it.

(Example) In Fig. 1 and Fig. 2, ■ is a select switch, which has a configuration having six shift switches P, R, N, D, and 2.1, which are P to J. In the embodiment, each shift switch is of a self-return type bush button type (returns to the original position 6 when the pressing force is released). Of course, the P shift switch issues a parking command, and the R shift switch issues a parking command to 7.
The N shift switch issues a neutral command, the D shift switch issues a drive command, the 2nd gear shift I switch issues a 2nd gear command, and the 1st gear shift switch issues a 1st gear shift command.
It is designed to issue speed commands.

When any one of these shift switches is pressed, a shift position command signal is output to the controller 2.

3 is an engine, 4 is an automatic transmission, and the controller 2
includes a logic circuit section 5 and an input a control circuit 6 for controlling its human power, and has a function of controlling a motor 7 as an electromagnetic first stage for switching the manual valve of automatic shift a4 to each shift position. You're right.

As shown in FIG. 2, the logic circuit section 5 receives, in addition to the gear shift position command signal from the select switch J, an engine rotation speed detection signal sI, an accelerator opening signal S2. Vehicle speed signal S
Control signals required for controlling the third-class automatic transmission 4 are input.

This logic circuit section 5 has a ``1F source'' city pressure +
5 is stepped down and applied through a regulator 9, and a part of the stepped down voltage of the regulator 9 is also used as a power source for a shift position one-angle display circuit and a changeover switch as a means for inhibiting shift changes, which will be described later. It has become something that

The logic circuit section 5 has a P input terminal, an N input terminal, an R input terminal, a D input terminal, a 2nd speed input terminal, and a J speed input terminal to which a shift position command signal is input, and a terminal corresponding to the shift position command signal. P output terminal, R output terminal, N which outputs the gear shift position switching signal
It has an output terminal, a D output terminal, a 2nd speed output terminal, and an 1st speed output terminal, and in this embodiment, the logic circuit section 5 is activated by a fall from high to low. ing.

The shift position switching signal from the logic section 5 is output toward the drive circuit 10 of the motor 7.
The operating position of the automatic transmission 4, that is, each shift position of the automatic transmission 4, is detected by a shift position detection device 11.

As shown in FIG. 3, the motor drive circuit 10 is roughly composed of a motor power supply circuit 12, a reference voltage setting circuit 13, a forward/reverse control circuit 14, and a forward/reverse current supply circuit 15. There is.

The motor drive power supply circuit 12 includes a regulator 16 for reducing voltage and a DC/DC converter 17 for increasing voltage.

The reference main reference voltage setting 3 described in 1iif is the operation amplifier 1 that constitutes a part of the forward/reverse control circuit 14.
It has a function of applying a reference voltage to the positive terminal of 8, and is composed of a voltage dividing circuit 19 and reference voltage setting switches 20 to 25. Reference voltage setting switch 20-25
In the example, an electromagnetic relay is used, and 20a to 20a are used.
25a is the contact point, 20b-25b are the respective contact points 20a-
This is a coil for opening and closing 25a. The above contact 25a
is closed by a shift position switching signal from the P output terminal, contact 24a is closed by a shift position switching signal from the R output terminal, and contact 23a is closed by a shift position switching signal from the N output terminal. The contact 22a is closed by the shift position switching signal from the D output terminal, the contact 21a is closed by the shift position switching signal from the 2nd speed output terminal, and the contact 20a is closed by the shift position switching signal from the 1st speed output terminal. It is closed by the shift position switching signal. And each contact point 20
A reference voltage corresponding to the closing of any one of contacts a to 25a is applied to the positive terminal of the operation amplifier 18. Specifically, when the contact 25a is closed, the reference voltage E is applied to the positive terminal of the operation amplifier 18. When the contact 23a is closed, the reference voltage E2 is applied, and when the contact 23a is closed, the reference voltage E3 is applied to the contact 22.
When the contact a is closed, the reference voltage E is applied to the positive terminal of the operation amplifier 18, when the contact 21a is closed, the reference voltage E5 is applied, and when the contact 20a is closed, the reference voltage E11 is applied to the positive terminal of the operation amplifier 18. It has become something that Of course, each of the reference voltages E1 to E6 corresponds to each shift position of the automatic transmission 4, respectively.

In the embodiment, the shift position detection device 11 uses a potentiometer, lla is a resistor constituting the shift position detection device, llb is a slider, and the slider 11b is configured to be interlocked with the motor 7. The shift position detection potential Eg is applied to the negative terminal of the operation amplifier 18 via the resistor 26.

The operation amplifier 718 connects any one of the reference voltages E1 to Es described above and the shift position detection device 1.
It has a function of comparing the detected voltage Eg of 1 and controlling the forward/reverse current supply circuit 15 so that the motor 7 rotates in a direction in which the potential difference becomes smaller. The forward/reverse current supply circuit 15 is composed of a forward current supply circuit 27 and a reverse current supply circuit 28.
The reverse current supply circuit 28 is roughly composed of a switching transistor 31 and tie-outs 1 and 32. Here, when the shift position detection potential Eg is lower than the reference voltage applied to the positive terminal of the operation amplifier 18, the normal rotation current supply circuit 2
The switching transistor 29 of No. 7 is turned on, and a normal rotation current in the direction of arrow A is supplied to the motor 7. Conversely, when the shift position detection potential Eg is higher than the reference voltage applied to the positive terminal of the operation amplifier 18, the switching transistor 31 of the reverse current supply circuit 28 is turned on, and the motor 7 A reverse current in the direction of arrow B is supplied to. Of course, both switching transistors 29 and 31 are turned off when the potential difference between the reference voltage input to the operational amplifier 18 and the shift position detection device Eg disappears.

Note that the operation amplifier 18 includes a D C
/DC converter 17 output voltage +15V is applied, output voltage +15V of converter 17 is applied to the collector terminal of switching transistor 29, and +15V of converter 17 is applied to the collector terminal of switching transistor 31. , the output voltage of the converter 17 of ±15 V is applied to both ends of the voltage dividing circuit 19.

FIG. 4 shows the overall configuration of the shift position display circuit 33, which has a function of displaying which shift position the automatic transmission 4 is at. The shift position display circuit 33 is roughly composed of a lighting display circuit 34, an indicator 35, and a display position detection device 36.

The lighting display circuit 34 is roughly composed of a switching transistor drive circuit 37 and a switching transistor group 38, and the switching transistor drive circuit 37 includes a voltage dividing circuit 39, a comparison circuit 40, and a logic circuit 41.
It has The voltage dividing circuit 39 has a function of applying a reference voltage to each of the comparators 40a to 4Of that constitute the comparator circuit 40, and here, the positive terminal of the comparator 40a -
A reference voltage G+ is applied to the terminal, a reference voltage G2 is applied to the positive terminal of the comparator 40b, a reference voltage G3 is applied to the positive terminal of the comparator 40C, and a reference voltage G3 is applied to the positive terminal of the comparator 40d. G4 is applied to the positive terminal of the comparator 40e (quasi-voltage G5 is applied to the positive terminal of the comparator 40e,
A reference voltage G6 is applied to the positive terminal of Of.
The voltage decreases from the reference voltage G1 toward 06.

In the embodiment, a potentiometer is used as the display position detection device 36, and it is roughly composed of a resistor 36a and a slider 36b. The slider 36b is configured to be interlocked with the motor 7, and its detected potential Gf is input to the negative terminal of each of the comparators 40a to 4Of. Each of the comparators 40a to 4Of outputs a low signal to the logic circuit 41 when the detection potential Gf is larger than the reference potential.
It also has a function of outputting a high signal toward the logic circuit 41 when the detected potential Gf is smaller than the reference potential.

The logic circuit 41 drives the switching transistor group 38 based on the output signal from the comparator 40.
It is composed of inverter elements 42-47 and NAND circuits 48-52. The switching transistor group 38 is composed of switching transistors 53 to 58, and each switching transistor 53 to 58 is turned ON when a high signal is input as a drive signal from the logic circuit 41.
It is supposed to be done. In the embodiment, the display 35 is composed of a plurality of LED elements 59 to 64, and the LED
Element 59 corresponds to the parking position, 60 corresponds to the reverse position, 61 corresponds to the neutral position, 62 corresponds to the drive position, 63 corresponds to the second gear position, and 64
corresponds to the first speed position, and when each of the switching transistors 53 to 58 is turned on, it is energized and lights up.

The output of the NAND circuit 48 is high only when the detection potential Gf is between the reference voltages G+ and 62, and the output of the NAND circuit 49 is high only when the detection potential Gf is between the reference voltages G2 and 62.
is high only if it is between 3 and 50
The output of the NAND circuit 51 is high only when the detection potential Gf is between the reference voltages G3 and G.
It is high only when the detection potential Gf is between the reference voltages G4 and 05, and the output of the NAND circuit 52 is the detection potential G.
The configuration is such that it is high only when f is between the reference voltages G5 and 66. Therefore, when the detection potential Gf is larger than the reference voltage G, the LED element 59 is lit, and when the detection potential Gf is between the reference voltage G and 02, the LED element 60 is lit, and the detection potential When Gf is between the reference voltage G2 and G's, the LED element 61
is lit, and when the detection potential Gf is between the reference voltages G3 and 04, the LED element 62 is lit, and the detection potential Gf is between the reference voltages G3 and 04.
When f is between the reference voltage G and 65, the LED element 63 is lit, and the detected potential Gf is between the reference voltage Gs and 65.
6, the LED element 64 is turned on.Here, in the present invention, when the ignition switch 65 shown in FIG. Regardless of the operation, the automatic transmission 4 cannot be switched from the parking position to any other shift position. To explain this point in detail, one end of each shift switch P-1 of the select switch is connected to the negative terminal of the battery 8 (grounded), while the other terminal is connected directly to the P shift switch. Although it is connected to the P input terminal of the logic section 5, the remaining R-
Each of the shift switches 1 is connected to the corresponding input terminals R to 1 of the logic section 5 via the input control circuit 6 described above.

The input control circuit 6 includes R-1 other than the P shift switch.
The number of OR circuits 66 to 70 corresponds to the number of shift switches.
and the other terminal of each shift switch of R-1 is
It is connected to one input terminal of the corresponding OR circuits 66-70. Although not shown in the figure, bias voltages are individually applied between each shift switch of R~1 and one input terminal of each of the corresponding OR circuits 66 to 70, and the shift switch of R~1 is applied individually. When the switch is open, a high signal is output to one input terminal of the corresponding OR circuit 66-70.

The other input terminal of the OR circuit is the inverter element 71
It is connected to the electromagnetic changeover switch 72 via. This changeover switch 72 has two contacts 72a and 72.
b, the -power switching contact 72a is connected via the ignition switch 65 to the other switching contact 72b.
are connected to the positive terminal of the battery 8, bypassing the ignition switch 65.

The switching of the changeover switch 72 is performed by its coil 72C, and the coil 72c is energized only when the above-mentioned shift position detection means 36 detects the parking position, and switches to the one switching contact 72a side. In other cases, the switch is switched to the other switching contact 72b. This coil 72c is connected to the regulator 9 and the LED element 5 that displays the parking position.
9, so that the coil 72c is energized only when the automatic transmission 4 is in the parking position.

The details of control in the above configuration will be explained below.

Assume that the driver presses the P shift switch of the select switch l to issue a parking position selection command and opens the ignition switch 65 in order to leave the vehicle. Then, by pressing this P shift switch, a low signal is input to the P input terminal of the logic section 5, and as a result, the logic section 5 outputs from its P output terminal, and the motor 7 shifts to the automatic transmission 4. While the manual valve is switched to the parking position, the LED element 59 of the shift position indicator 35 indicating the parking position is lit, and as the LED element 59 is lit, the changeover switch 72 has its coil 72c energized. It is switched to the contact 72a side.

In such a state, for example, if a child remaining in the vehicle inadvertently presses a shift switch other than the P shift switch of the select switch, such as the D shift switch, the low signal from the D shift switch will be output to the OR circuit. 66 is input to one input terminal. however,
In this case, since the changeover switch 72 is on the contact 72a side and the ignition switch 65 is open, a low signal is generated from the changeover switch 72 side.
This low signal is converted into a high signal by the inverter element 71 and input to the other input terminal of the OR circuit 66. Therefore, the /\i signal is output from the OR circuit 66 to the D input terminal of the logic section 5, and the logic section 5 does not operate, even though the D shift switch is pressed. The automatic transmission 4 will continue to maintain the parking position. This also applies when the R, N, 2, and [ shift switches of the select switch 1 are pressed.

On the other hand, when the driver closes the ignition switch 65 to start the vehicle, the OR circuits 66 to 7
A high signal was input to o via the inverter element 71, but it was switched to a low signal, and therefore,
In this case, select switch 1 R, N, D, 2.1
When one of the shift switches, for example, the D shift switch, is pressed, a low signal is input to the OR circuit 66 corresponding to the pressed D shift switch, so a low signal is input to the D input terminal of the logic section 5. It is uttered. As a result, the logic unit 5 is activated and an output signal is output from its D output terminal to the motor drive circuit lo, and the motor 7 switches the manual valve of the c+e transmission 4 to the drive position. Then, while the LED element 62 corresponding to this drive position is newly lit, the LED element 59 corresponding to the parking position is turned off, and as a result, the changeover switch 72 is switched to the contact 72b.
switched to the side. Contact point 72 of this changeover switch 72
Even after switching to b, the human power from the inverter element 71 to the OR circuits 66 to 70 is a low signal, so after this,
By operating any shift switch of the select switch 1, the shift position will be changed to the corresponding shift position.

Although the embodiments have been described above, the present invention is not limited thereto, and includes, for example, the following cases.

(2) As the electromagnetic means for switching the manual valve of the automatic transmission 4, a solenoid other than the motor 7 may be used.

■In order to prohibit switching from the parking position to another shift position when the ignition switch 65 is open, the output from the logic section 5 to the motor drive circuit 10 may be controlled, or the motor It may be possible to control the operating power supply voltage supply itself of No. 7, and further, it may be incorporated into all other shift switches except for P shift switch No. 1, which is a locking mechanism operated by a solenoid, for example, to suppress the other shift switches. It may also be made inoperable.

C3) A liquid crystal, a light bulb, etc. may be used instead of the LED elements 59 to 64.

(Each shift switch of the 7-select switch 1 can be of an appropriate type, such as a set of levers.

+3) Although the description has been made for an automatic transmission having six shift positions jδ from P to l, which is the most standard, the same applies to automatic transmissions of the transmission type that further have overdrive as a shift position. It is possible.

(Effects of the Invention) As is clear from the following two statements, the present invention provides a method for operating the select switch when the ignition switch is open, that is, when there is no person familiar with driving at least near the vehicle. Since the automatic transmission does not switch from the parking position to any other gear position without any care, it prevents the situation where the vehicle starts to move unexpectedly while a person who knows how to drive is away from the vehicle. This can be reliably prevented and is extremely effective from a safety standpoint.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of the present invention. FIG. 2 is an overall circuit diagram showing an embodiment of the present invention. FIG. 3 is a circuit diagram showing the motor drive circuit of FIG. 2 in detail. FIG. 4 is a circuit diagram showing details of the shift position display circuit of FIG. 2. l@e fist number 7 select switch fist/middle controller 4... automatic transmission 7... motor (electromagnetic means) 36... shift position detection device 65... O ignition switch φ

Claims (1)

[Claims] (1) An electromagnetic means for switching a manual valve of the automatic transmission to each shift position; a controller for controlling the operation of the electromagnetic means; a select switch for instructing the controller to operate the electromagnetic means; and the automatic transmission. a shift position detecting means for detecting that the shift position of the automatic transmission is in the parking position; and receiving an output from the shift position detecting means, when the automatic transmission is in the parking position and the ignition switch is closed. A transmission device for an automatic transmission, comprising: a shift change inhibiting means that only allows operation of the electromagnetic means by the select switch.