JPS6338581B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an automatic transmission in which the shift position of an automatic transmission in a vehicle is changed by an electric control device such as a motor or a solenoid valve responsive to a select switch. This invention relates to a switching device.

2. Description of the Related Art Vehicles equipped with automatic transmissions, such as automobiles, are constructed so that the engine can only be started when the automatic transmission is in a parking position or a neutral position. On the other hand, in cars equipped with automatic transmissions, when stopping at intersections, railroad crossings, etc., the automatic transmission is usually kept in the drive position; When a so-called engine stall occurs, first move the automatic transmission to the neutral position (or parking position).
After shifting to , it was necessary to start the engine using the ignition switch.

The present invention has been made in view of the above circumstances, and its object is to move an automatic transmission to a parking position or a position where the engine can be started when the ignition switch is on and the engine is stopped. It is an object of the present invention to provide a switching device for an automatic transmission that can automatically switch to a neutral position. To provide a switching device for an automatic transmission which has the effect of automatically returning the transmission to its original position.

A first embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, reference numeral 1 denotes a motor serving as an electric control device connected to a control shaft of an automatic transmission (not shown). When the motor 1 is energized in the direction of arrow A in the figure, it rotates in the forward direction and rotates in the direction of arrow A. When energized in direction B, it rotates in the opposite direction. When the motor 1 is rotated in the forward direction, the automatic transmission is switched from the parking position to the low position, and when the motor 1 is rotated in the reverse direction, the automatic transmission is switched in the opposite direction. The automatic transmission of this embodiment has a reverse position, a neutral position, a drive position, and a second position in this order between the parking position and the low position.
Although not shown, a well-known neutral start switch is provided to detect the shift position of the automatic transmission, and is used to detect whether the automatic transmission is in the parking position or the neutral position. The structure is such that it is possible to form an engine starting circuit only when the engine starts. 2 is a drive circuit for driving the motor 1, which includes transistors 3, 4,
5 and 6 and resistors 7, 8, 9, and 10 are connected to a positive terminal 11 of a DC power supply, a ground terminal, and a motor 1 as shown in the figure. 1
Reference numeral 2 denotes a potentiometer for detecting the rotational position of the motor 1 and, in turn, the rotational position of the control shaft of the automatic transmission.The brush 12a is provided so as to be linked to the rotation of the motor 1. 12a is configured to be moved in the direction of arrow a when the motor 1 is rotated in the forward direction, and moved in the direction of the arrow b when the motor 1 is rotated in the reverse direction. Both ends of the potentiometer 12 are constant voltage power supply terminals +
The detection voltage Vd is connected between the brush 12a and the ground terminal, and therefore the level of the detection voltage Vd output from the brush 12a is the same when the rotational position of the motor 1 is in the forward rotation direction (in other words, when the automatic transmission (if the shift position is closer to the low position), the higher the shift position.

On the other hand, 13 to 18 are select switches for selecting the shift position of the automatic transmission, and these are comprised of automatic return type push button switches.
4, 15, 16, 17 and 18 are automatic transmission parking positions;
Reverse position, neutral position,
There is a one-to-one correspondence between the drive position, second position, and low position. In this case, each of the select switches 13 to 18 has one end grounded and the other end connected to the lines L1 to L6, respectively.
and each line L1 to L6 is connected to OR
It is connected to each input terminal of the circuits 19 to 25 as shown. Numerals 26 to 31 are latches consisting of R-S flip-flops of rising trigger type, and each set input terminal S and reset input terminal R are connected to each output terminal of OR circuits 19 to 25 and lines L2 to L6 as shown. is,
This arrangement prevents two or more of the latches 26 to 31 from being set at the same time. 32 is a voltage dividing circuit consisting of a series circuit of resistors 33 to 39;
A resistor 33, which is one end of the series circuit, is connected to the output terminal Q of the latch 26 via a diode 40 with the polarity shown, and a resistor 39, which is the other end of the series circuit, is connected to the ground terminal. Each common connection point between 33 to 38 is connected to the latch 2 via a diode 41 to 45 of the polarity shown.
They are connected to output terminals Q 7 to 31, respectively.
Therefore, the levels of the divided voltages Va and Vb output from the output points 32a and 32b of the voltage dividing circuit 32 are as follows:
It is lowest when the latch 26 is outputting a high level signal, and highest when the latch 31 is outputting a high level signal. 46
Numerals 51 to 51 are indicators for displaying the actual shift position of the automatic transmission, and these indicators are connected between the cathodes of diodes 40 to 45 and the ground terminal, respectively. 52 is the detection voltage from potentiometer 12
Vd is received at the inverting input terminal (-) and the voltage divider circuit 3
This is a comparator that receives the divided voltage Va from 2 at its non-inverting input terminal (+), and its output terminal is connected to the base of the transistor 3 via a resistor 7. 53 receives the detected voltage Vd from the potentiometer 12 at a non-inverting input terminal (+), and receives the divided voltage Vb from the voltage dividing circuit 32 at an inverting input terminal (-).
The output terminal is connected to the base of the transistor 4 via a resistor 8. Reference numeral 54 designates a detection circuit for outputting an engine stop signal Sa when the engine in the driving state comes to a stop state, and this is constructed by combining the following well-known means. In other words, the pickup circuit 54 is included in the detection circuit 54.
For example, if the engine speed detected by a is 200r.
pm or more, a comparison circuit inverts its output to a high level signal, and a trigger circuit that is triggered by the fall of the output of the comparison circuit and inverts the state to output a high level signal, A high level signal from this trigger circuit is output as an engine stop signal Sa. still,
The trigger circuit is configured to be initialized, for example, when the engine speed subsequently reaches 200 rpm or more. In other words, the detection circuit 54 outputs a high-level signal to stop the engine when the rotational speed of the engine in the driving state drops to less than 200 rpm (in other words, when the engine in the driving state comes to a halt). Outputs signal Sa, and outputs a low level signal in other states. Also, 55
is an AND circuit that constitutes the control circuit 56 together with the latches 26 to 31, voltage dividing circuit 32, comparators 52, 53, etc., one input terminal of which is connected to the output terminal of the detection circuit 54,
The other input terminal is connected to the positive power supply terminal +V of the battery via the ignition switch 57. The output terminal of the AND circuit 55 is connected to the OR circuits 19, 21, 22, 23, 2.
They are connected to input terminals 4 and 25, respectively.

Next, the operation of the above configuration will be explained. When the engine is currently rotating normally, the engine speed is at least 200 rpm, so the detection circuit 54 outputs a low level signal. Therefore, since a high level signal is not output from the AND circuit 55, the latches 26 to 31
The latches 26-31 are ready to be triggered by the select switches 13-18 without being set or reset. At this time, if the automatic transmission is in the parking position, for example, a high level signal is output from the latch 26 and the indicator 46 is lit, and the potentiometer 12 outputs a high level signal, as will be understood from the description below. detection voltage
Vd is in a relatively low state. In this state, in order to shift the automatic transmission to the drive position, for example, when the select switch 16 is turned on and then released to turn it off, a pulse signal Sp is output to the line L4. Then, the latch 29 is set by the rise of the pulse signal Sp, and a high level signal is output from its output terminal Q, and the other latches 26, 27, 28, 30, and 31 are reset, and as a result, At this time, divided voltages Va and Vb (however, Va
>Vb) is output. Such a divided voltage Va,
When Vb is output, a high level signal is output from the comparator 52 and the comparator 53
A low level signal is output from the transistor 4, and the transistor 4 is turned on by the low level signal, and the transistor 5 is turned on in response to this turning on. As a result, motor 1
is energized in the direction of arrow A through transistors 4 and 5 and rotated in the forward direction, and in response to such forward rotation, the automatic transmission is switched from the parking position to the drive position, and the potentiometer 12 brush 12a
is moved in the direction of arrow a, and the level of detection voltage Vd increases. In this case, when the automatic transmission is switched to the drive position, the level of the detection voltage Vd in that switching state falls between the divided voltages Va and Vb when the high level signal is output from the latch 29. Therefore, when the automatic transmission is switched to the drive position by the forward rotation of the motor 1 described above, the relationship Va>Vd>Vb is established, and the output from both the comparators 52 and 53 is set in advance. A high level signal is output. Therefore, transistors 3, 4, 5, 6
are all turned off and the motor 1 is maintained in the drive position.
In this case, when the motor 1 is cut off, the motor 1 rotates slightly due to inertia and the level of the detected voltage Vd fluctuates, but the width of the divided voltages Va and Vb is set by the resistor 38 so that the range of the fluctuation can be absorbed. Therefore, since it has been set in advance, it does not require any support. Incidentally, when a high level signal is output from the latch 29 in response to turning on the select switch 16, the indicator 49 is lit by the high level signal, thereby indicating that the drive position has been switched. .

Also, even when the automatic transmission is switched to the parking position, reverse position, neutral position, second position, or low position,
The level of the detection voltage Vd in each switching state is the divided voltage Va in each state where a high level signal is output from the latches 26, 27, 28, 30, and 31, respectively.
It is preset to settle between Vb. Therefore, even if one of the select switches 13, 14, 15, 17, and 18 is turned on while the engine is running normally, the automatic transmission will switch to the selected switch that was turned on. Automatically changes to the shift position that corresponds to the switch.

If a so-called engine stall occurs while the automatic transmission is held in the drive position, for example, the automatic transmission operates as described below. That is, in this case, since the engine is stopped, the engine stop signal Sa is output from the detection circuit 54 and applied to one input terminal of the AND circuit 55, and the ignition switch 57 is not turned on at this time. Since the high level signal from the positive terminal +V is applied to the other input terminal of the AND circuit 55, a high level signal is output from the AND circuit 55 as a result. Then, as the high level signal rises, the latch 26 is set, a high level signal is output from its output terminal, and the latch 29 is reset. Therefore, the voltage dividing circuit 32 outputs divided voltages Va and Vb that are lower in level than the detection voltage Vd at this point, and the comparator 52 outputs a low level signal, and the transistors are turned on accordingly. Motor 1 is energized in the direction of arrow B via 3 and 6. Then, the motor 1 is rotated in the opposite direction, and the automatic transmission is switched from the drive position to the parking position, and the switched state is maintained in the same manner as described above.

In the above embodiment, the automatic transmission is automatically switched to the parking position when the engine stalls.
It may also be configured to automatically switch to the neutral position.

FIG. 2 shows a second embodiment of the invention,
Hereinafter, only the differences from the first embodiment will be explained.

In FIG. 2, 58 is a drive circuit for driving the motor 1, which includes the excitation coil 59a of the relay 59, the relay switch 59b, and the relay 6.
The excitation coil 60a and the relay switch 60b are connected to the positive terminal 11 of the DC power supply and the fixed brushes 61 and 6.
2 and the motor 1 as shown in the figure. In addition, relay switch 59
b, 60b, the contact c and b are normally closed. 6
Reference numerals 3 and 64 designate movable contact plates arranged to slide relative to the fixed brushes 61 and 62, respectively, and having a gap 65 between them. It is configured to move in the direction of arrow d in conjunction with the movement in the direction of arrow c and when the motor 1 is reversely rotated.
Reference numerals 66 to 71 are fixed contacts arranged in a column so that the movable contact plates 63 and 64 are in sliding contact with each other. Gap 6 when switched to position
5 is moved to a position corresponding to the fixed contact 66,
Similarly, when the automatic transmission is switched to the reverse position, neutral position, drive position, second position, and low position, the gap 65
The structure is such that the contacts are moved to respective positions corresponding to the fixed contacts 67, 68, 69, 70, and 71.
Reference numerals 72 to 77 indicate select switches for selecting the shift position of the automatic transmission, and these switches are locked in the on state by a lock mechanism (not shown), and are configured so that two or more switches are not turned on at the same time. . In this case, the select switch 75 corresponding to the drive position is connected between the fixed contact 69 and the ground terminal via the contacts c and b of the relay switch 78b, and the other select switches 72, 73, 74, 7
6 and 77 are fixed contacts 66, 67, 68, and 7, respectively.
0,71 and the ground terminal.
In addition, the normally open side fixed contact a of the relay switch 78b
and fixed contact 68 are connected to each other. On the other hand, 79 and 80 are AND circuits, 81 is an inverter,
82 is a delay circuit, which is connected to the output terminal of the detection circuit 54 and the ignition switch 57 as shown. 83 is a latch consisting of an R-S flip-flop, the set input terminal S and reset input terminal R of which are connected to the output terminals of AND circuits 79 and 80, respectively;
An output terminal Q is connected to a ground terminal via an amplifier 84 and an excitation coil 78a of a relay 78.

Now, 85 is an engine restart circuit that constitutes a control circuit 86 together with the latch 83, relay 78, etc. In this engine restart circuit 85,
87 is a latch consisting of a D flip-flop;
8 and 89 are AND circuits, and 90 and 91 are inverters, which connect the input terminal P of the starting circuit 92, the output terminal of the detection circuit 54, the ignition switch 57, the fixed contact 68, and the fixed brushes 61 and 62. They are connected as shown in the figure.
The starting circuit 92 is configured to automatically form an engine starting circuit when a high level signal is received at its input terminal P, and the inverter 91 and fixed contact 68 are connected via a line La. has been done.

Next, the operation of the second embodiment having the above configuration will be explained. Now, for example, when the select switch 75 is turned on, the other select switches 72, 7
3, 74, 76, and 77 are turned off, and
As will be understood from the description below, the movable contact plates 63, 64
A gap 65 in between corresponds to a fixed contact 69. At this time, if the engine is rotating normally, the detection circuit 54 outputs a low level signal, so as a result, a low level signal is output from the AND circuit 79, and the AND circuit 8
A high level signal is output from 0.
Therefore, the latch 83 is in the reset state and outputs a low level signal from its output terminal Q, so that the excitation coil 78a of the relay 78 is de-energized. The relay 78 has its excitation coil 7
The relay switch 78b is configured to turn on contacts c and b when the switch 8d is cut off, and as described above, the select switches 72, 73, 7
4, 76, 77 are turned off, so all fixed contacts 66, 67, 68, 69, 70, 71
is in a non-conductive state with respect to the ground terminal, and the motor 1 is de-energized. From this state,
When the select switch 72 is turned on to shift the automatic transmission to the parking position, for example, a lock mechanism (not shown) turns off the select switch 75 and locks the select switch 72 in the on state. . Then, the excitation coil 5 of the relay 59
9a, from the positive terminal 11 to the fixed brush 6
1. The movable contact plate 63, the fixed contact 66, and the select switch 72 are energized, and at this time, the excitation coil 60a of the relay 60 is in a power-off state, so the relay switch 59b is connected to the contact ca.
and the relay switch 60b is connected to the contact c-
b is turned on. As a result, the motor 1 is energized in the direction of arrow B via the relay switches 59b and 60b and rotated in reverse, and in response to such reverse rotation, the automatic transmission is switched from the drive position to the parking position. Along with this, movable contact plates 63 and 64
is now moved in the direction of arrow d. and,
When the automatic transmission is switched to the parking position, the gap 65 corresponds to the fixed contact 66 as described above, so the transmission is performed via the fixed brush 61, movable contact plate 63, fixed contact 66, and select switch 72. The energizing path of the excitation coil 59a is suddenly cut off, and the relay switch 59b returns to the on state between contacts c and b. In response, the motor 1 is cut off and the automatic transmission is switched to the parking position. It will now be kept in the same state. Also, when one of the other select switches 73, 74, 75, 76, 77 is turned on while the engine is running normally, the automatic transmission is turned on. The shift position corresponds to the selected select switch.

On the other hand, if the engine stalls while the automatic transmission is held in the drive position, the following operation is performed. That is, in this case, the engine stop signal Sa (high level signal) is output from the detection circuit 54 in response to the engine stop;
The signal Sa is applied to the input terminal of the AND circuit 79 and the clock terminal Cp of the latch 87, and is also applied to the input terminal of the AND circuit 80 after being inverted to a low level signal via the delay circuit 82 and the inverter 81. Therefore, a high level signal is output from the AND circuit 79 and a low level signal is output from the AND circuit 80, and the latch 8
3 is set, and a high level signal is output from the output terminal Q of the latch 83. Also, at this time, the latch 8, which was previously in the reset state,
7 stores a high level signal inputted through the ignition switch 57 into its data input terminal D, and accordingly, a high level signal is outputted from the output terminal Q of the latch 87 and is applied to the AND circuit 88. is applied to one input terminal of However, as mentioned above, the output terminal Q of latch 83
When a high level signal is output from relay 78
The excitation coil 78a is now energized via the amplifier 84, and the relay switch 78b is connected to contact c.
- Turn on between a. Then, the excitation coil 59a of the relay 59 is energized from the positive terminal 11 through the fixed brush 61, the movable contact plate 63, the fixed contact 68, the contacts c and a of the relay switch 78b, and the select switch 75. Relay switch 59b now exhibits an on state between contacts c and a (relay switch 60 remains on between contacts c and b). Therefore, the motor 1 is energized in the direction of arrow B through the relay switches 59b and 60b and rotated in the reverse direction, and the automatic transmission is accordingly switched to the neutral position. When switched to the neutral position in this way, the fixed contact 68 moves to the gap 6.
5, the movable contact plates 63, 64
becomes non-conductive with respect to the ground terminal, the motor 1 is cut off as described above, and a high level signal corresponding to the output of the positive terminal 11 is sent to the second and third input terminals of the AND circuit 89. will be input respectively. In this case, a low level signal from the ground terminal is applied to the first input terminal of the AND circuit 89 between the select switch 75, the contacts c and a of the relay switch 78b, and the inverter 91.
Since the signal is input after being inverted to a high level signal via the AND circuit 89, a high level signal is output from the AND circuit 89. As a result, the AND circuit 88 receives a high level signal at both of its input terminals and gives a high level signal to the input terminal P of the starting circuit 92, so that the engine restart circuit is automatically activated by the starting circuit 92. is formed and the engine is restarted. When the engine is restarted in this way, the engine stop signal Sa from the detection circuit 54 disappears, so the state returns to the state where the AND circuit 79 outputs a low level signal and the AND circuit 80 outputs a high level signal. The latch 83 is reset, and in response to this reset, the excitation coil 78a is cut off and the relay switch 78 is turned off.
b is returned to the on state between contacts c and b. Also,
When the engine stop signal Sa from the detection circuit 54 disappears, a high level signal inverted by the inverter 90 is applied to the reset terminal R of the latch 87, so the latch 87 is reset and the operation of the starting circuit 92 is stopped. be done. However, at this point, the gap 65 is connected to the fixed contact 6.
8 and the fixed contact 69 corresponds to the movable contact plate 6.
4, the excitation coil 60a of the relay 60 is energized and the relay switch 60b is turned on.
will turn on contacts c and a. Then,
Motor 1 is energized in the direction of arrow A and rotates forward,
In response to this forward rotation, the automatic transmission is returned to the drive position, and this return causes the fixed contact 69 to shift from the gap 65.
In response to this, the motor 1 is de-energized and the automatic transmission is held in the drive position.

That is, according to the configuration of this embodiment, if the engine stalls while the automatic transmission is in the drive position, the automatic transmission is automatically moved to the neutral position where the engine can be started. When the engine is switched over, the engine is automatically restarted, and when the engine is restarted, the automatic transmission is automatically returned to its original drive position.

Incidentally, the delay circuit 82 in the second embodiment is as follows:
This is provided to guarantee the time from when the engine is restarted to when it is completely restarted. In addition, in the second embodiment, when starting the engine for the first time, the automatic transmission is switched to the neutral position or the parking position, and then the engine is started by manual operation using the ignition key. It is something. Further, the engine restart circuit 85 in the second embodiment may be provided as necessary.

According to the present invention, as is clear from the above description, when the engine is stopped with the ignition switch on, the automatic transmission is moved to the parking position where the engine can be started or to the neutral position. The automatic transmission can be automatically switched to the original position, and can also have the effect of automatically returning the automatic transmission to its original position when the engine is started after stalling. It is.

[Brief explanation of the drawing]

FIG. 1 is a wiring diagram showing a first embodiment of the invention, and FIG. 2 is a wiring diagram showing a second embodiment of the invention. In the figure, 1 is a motor (electric control device), 2,58
13 to 18, 72 to 77 are select switches, 54 is a detection circuit, 56 and 86 are control circuits, and 85 is an engine restart circuit.

Claims (1)

[Scope of Claims] 1. The shift position of an automatic transmission in a vehicle is configured to be changed by an electric control device responsive to a select switch, and the automatic transmission is configured to change a shift position of an automatic transmission in a vehicle to a parking position or a neutral position. A detection circuit that outputs an engine stop signal when the engine that is in a driving state comes to a stop state, and a detection circuit that outputs an engine stop signal when the engine that is in a driving state comes to a stop state; and a control circuit for switching the automatic transmission to a parking position or a neutral position by the electric control device on the condition that the ignition switch is turned on when the ignition switch is output. An automatic transmission switching device featuring: 2. The control circuit includes an engine restart circuit that automatically starts the engine when the automatic transmission is switched to the parking position or the neutral position. A switching device for an automatic transmission according to item 1. 3. The vehicle is configured to change the shift position of the automatic transmission in the vehicle by an electric control device that responds to a select switch, and only when the automatic transmission is in the parking position or neutral position. A device equipped with a neutral start switch that allows starting of the engine includes a detection circuit that outputs an engine stop signal when the engine that is in a driving state comes to a stop state, and a detection circuit that outputs an engine stop signal when the engine stop signal is output. Provided that the ignition switch is turned on, the electric control device switches the automatic transmission to the parking position or the neutral position, and then the engine is started and the engine stop signal is output. 1. A switching device for an automatic transmission, comprising a control circuit for returning the automatic transmission to its original shift position when the transmission is lost.