JPH0473029B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a speed change command to a controller by operating a select switch, operates an electromagnetic means based on the control command of the controller, and uses the electromagnetic means to automatically change the speed. The present invention relates to a transmission device for an automatic transmission that switches a manual valve of the transmission to a shift position corresponding to a shift command.

(Prior Art) As disclosed in Utility Model Application Publication No. 57-25237, there has been known a transmission device for an automatic transmission in which a manual valve of the automatic transmission is switched to each shift position by operating a select switch. It is being

This conventional automatic transmission transmission device includes a select switch that issues a gear change command, and an electromagnetic means that switches the manual valve of the automatic transmission to each gear shift position.
The electromagnetic means has a controller that receives a speed change command from a select switch and issues a control command to the electromagnetic means so that the manual valve is switched to a speed change position corresponding to the speed change command.

The select switch, electromagnetic means, and controller for changing speed in this manner are all electrically operated, and will cease to operate if disconnected from the power source. Normally, the connection to the power source is made by the ignition switch, but for example, if the ignition switch is turned off while driving and the connection between the select switch and the power source is cut off, the gears may not be changed while driving. There is a problem in that it becomes impossible to do so and is dangerous.

(Object of the Invention) In view of these problems, the present invention is designed to supply power supply voltage to the transmission as long as the vehicle is running even if the ignition switch is turned off, thereby improving safety. It is an object of the present invention to provide a transmission device for an automatic transmission that is improved.

(Structure of the Invention) A transmission device for an automatic transmission of the present invention provides a controller having a manual control section and an automatic control section that control the operation of electromagnetic means for switching a manual valve of an automatic transmission to each shift position. The operating position of the electromagnetic means is commanded to the manual control section by a select switch, while the vehicle speed is detected by the vehicle speed detection means, and when the vehicle speed is other than zero, the electromagnetic means,
The present invention is characterized in that the power supply circuit maintains the power supply even when an ignition switch that turns on and off the power supply to the controller and the select switch is off.

(Effects of the Invention) According to the present invention, when the vehicle speed is other than zero, that is, while the vehicle is moving, power is supplied to the controller etc. even if the ignition switch is off. Even if the ignition switch is turned off while driving, the speed change control according to the operation of the select switch is maintained, improving vehicle safety.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
FIG. 1 is an overall configuration diagram showing an example of the present invention.

A manual valve of an automatic transmission 2 connected to an engine 1 is switched to each shift position by the operation of an electromagnetic means 3 such as a motor or a solenoid. The operation of the electromagnetic means 3 is controlled by a controller 4, which has a manual control section 5 and an automatic control section 6, and the manual control section 5 has a select switch for commanding the operating position of the electromagnetic means 3. This select switch 7 has a P range switch, an R range switch, an N range switch, a D range switch, a 2nd speed range switch, and a 1st speed range switch. Here, the select switch 7 has a self-resetting push button configuration.

On the other hand, the automatic control section 6 of the controller 4 has a determining means 8 and a stop range switching means 9, and the determining means 8 includes an engine state detecting means 10 that detects the operating state of the engine 1 from, for example, an alternator operating signal. In response to the output signal and the output signal of the vehicle state detection means 11 that detects the stopped state of the vehicle from, for example, the vehicle speed and the accelerator opening, it is determined whether the engine 1 is operating and the vehicle is stopped, and a signal is sent. Output. Further, the stop range switching means 9
receives the output signal of the determination means 8 and outputs a signal to the electromagnetic means 3 to switch the gear shift position to the N range or the P range, which is the stop range, and when the engine 1 is operating and the vehicle is stopped. When the vehicle is in the stop range, the controller 4 operates the electromagnetic means 3 to automatically switch the gear position to the stop range.

Figure 2 shows the specific configuration. 15 is a power supply circuit, 16 is an input circuit, 17 is a logic circuit, 18 is a drive circuit, and 19 is a display circuit.

The power supply circuit 15 receives the voltage B of the battery 20,
It receives the ignition switch signal Ig via the ignition switch 21 and the vehicle speed signal V, and supplies power to the control system.

The input circuit 16 receives signals P, R, N, D, 2, 1 from each range switch of the select switch 7, an engine operating signal E from an alternator (not shown), an accelerator opening signal A, and a vehicle speed detection pulse signal V.
The received signals are converted into signals corresponding to the respective detected amounts and output to the logic circuit 17.

The logic circuit 17 has storage means, and the input circuit 16
The drive circuit 18 performs the operations shown in the flowchart of FIG. 3 in response to signals from the range switches P, R, D, 2,1
In response to this, a drive signal for forward or reverse rotation is output to the motor, which is the electromagnetic means 3 of the automatic transmission 2, to switch the gear shift position, and this switching position is detected by the potentiometer 22, and the drive circuit Reference numeral 18 compares the detection signal of the potentiometer 22 with the command signal and switches to a predetermined shift position where the two match.

Further, the display circuit 19 displays a shift range using an LED element or the like corresponding to a predetermined shift position in response to a detection signal from a potentiometer 22 linked to the operation of the drive circuit 18.

The operation of the controller 4, ie, the contents of the logic circuit 17 shown in FIG. 2, will be explained with reference to the flowchart shown in FIG.

After starting, check whether engine 1 is in operation at step 40 by checking the alternator's L terminal signal E.
If the engine 1 is in the operating state (YES), it is determined in step 41 whether or not the driving range button has been pressed by the select switch 7, based on the presence or absence of the command signal, and the driving range is changed. When the button is pressed (YES), the driving range pressed in step 42 is memorized, and the display circuit 19 flashes an on display for that range.

Next, in step 43, it is determined based on the signal A of the accelerator switch 24 whether there is a start signal, and if there is no start signal, it is determined in step 44 whether or not a button for another driving range has been pressed. , wait until a start signal is generated and the judgment in step 43 becomes YES, and when there is a start signal, in step 45 the vehicle shifts to the driving range memorized in step 42, turns the ON display on continuously, and
The program moves to the running state in step 46.

When stopping the vehicle, it is determined in step 47 whether there is a stop signal or not based on the accelerator fully closed signal and the vehicle speed zero signal, and if the stop signal is YES, the vehicle is stopped in step 48 and the vehicle is stopped for a certain period of time. If the answer is YES, indicating that the vehicle has been stopped for a predetermined period of time or more, the vehicle shifts from the driving range to the N range (or P range) in step 49, and the process ends. Note that step 48 is performed when the vehicle is stopped for a short period of time, since if the shift position is shifted to the stop range in response to a driving state in which running and stopping are repeated, the durability of the electromagnetic means 3 will be adversely affected. This is to exclude.

To explain each circuit in FIG. 2 in more detail, the power supply circuit 15 includes a main switching relay R that turns on and off the battery power supply B, as shown in FIG.
The main switching relay R is operated by energizing the exciting coil 30. First, ignition switch 21
When closed, the power supply 20 and the base of the NPN transistor 31 are connected via the ignition switch 21, and a voltage is applied to the base, turning on the transistor 31. The emitter of this transistor 31 is grounded, and the collector is connected to the base of the PNP transistor 32, and when the NPN transistor 31 is turned on, the PNP transistor 3
The base of 2 is grounded. Therefore, the PNP transistor 32 is turned on, but this
The emitter of PNP transistor 32 is line 33
It is connected to the power supply 20 via the ignition switch 21, and its collector is grounded via a resistor 34 and connected to the base of an NPN transistor 36 via a resistor 35.
and 35, the voltage determined by transistor 3
It takes 6 bases. For this reason, the excitation coil 3
0, line 40 and ignition switch 2
The NPN transistor 36, which has a collector connected to the power supply 20 via the transistor 1 and an emitter connected to the ground, is turned on, and the excitation coil 30 is energized. When the excitation coil 30 is energized, it is excited, turns on the main switching relay, and connects the first power output terminal BO ₁ to the power supply 2.
Connect it to 0.

Next, consider when the ignition switch 21 is opened. At this time, the NPN transistor 31 is turned off and the connection between the base of the PNP transistor 32 and the ground is cut off.
The base of this NPN transistor 37 is connected to the vehicle speed terminal V which receives the vehicle speed signal from the vehicle speed detection means (not shown), and the emitter is grounded, so the vehicle speed signal is input. When this NPN transistor 3
7 turns on, grounding the base of PNP transistor 32. Therefore, even if the ignition switch 21 is opened, if the vehicle is running,
The NPN transistor 36 is turned on, and the excitation coil 30 receives current from a line 39 connected to the power source 20 via the main switching relay R, and is energized to keep the main switching relay R closed. In this way, even if the ignition switch 21 is opened while the vehicle is running, the power supply will not be cut off until the vehicle stops.

Also, when the vehicle stops and the ignition switch 21 is opened, the NPN transistor 31
and 37 are both turned off, and the connection between the base of the PNP transistor 32 and the ground is cut off. However, the capacitor 38 keeps the PNP transistor 32 on for a predetermined time (approximately 10 seconds in this example) to continue supplying power. The switching operation of the electromagnetic means 3 is made possible, for example, to switch to the P range.

As shown in FIG. 5, the input circuit 16 receives the L terminal signal E of the alternator and the ignition switch 2.
1 closing signal Ig, accelerator switch 24 opening signal A
(accelerator fully closed signal), which outputs them as high level or low level signals from each output terminal when each range signal P, R, N, D, 2, 1 of the select switch 7 is input respectively. The vehicle speed pulse signal V outputs a high level signal when the vehicle speed is above a set value, and outputs a low level signal when the vehicle speed is less than the set value.

The drive circuit 18, as shown in FIG.
A comparator 25 compares the command speed change signal output in response to the operation of the select switch 7 and the current speed change position signal of the potentiometer 22 interlocked with the electromagnetic means 3 that detects the current switching position of the electromagnetic means 3. Compare and set the transistor drive unit 2 so that the two match.
A signal for forward or reverse rotation is output from 6a, 26b to the electromagnetic means (motor) 3, and the electromagnetic means 3 is stopped when the command shift signal and the current shift position signal match. The configuration and operation of these will be described in detail below. The first power output terminal BO ₁ of the power supply circuit 15 explained in FIG. 4 is the first power input terminal BI ₁ of the main circuit 18.
The second power input terminal BO ₂ is connected to the second power input terminal BI ₂ to supply power.

The input from the second power supply input terminal BI ₂ is maintained at a constant voltage (5V) by the constant voltage circuit 50 and is supplied to each part. First, line 5 for the command speed change signal.
1 is connected to the connection point 53 via the resistor 52, and P other than N at the shift command switch 70.
A connection point is established through a resistor connected to any one of the plurality of resistors connected through normally open contacts corresponding to R, D, 2, and 1, which is closed in response to the operation of the shift command switch 70. It is divided into 53 items. Therefore, the potential at the connection point 53 is determined via the resistor 52 and a resistor via a normally open contact that is closed in response to the operation of the select switch in parallel, and this potential becomes the command shift signal. In this case, N (neutral) is determined by the command speed change signal based on the potential determined only through the resistor 52 when all normally open contacts are open. Therefore, for example, when a disconnection or disconnection of the coupler occurs between the shift command switch 70 and the drive circuit 18, the command shift signal becomes N, thereby improving safety.

In response to this command shift signal, the current shift position of the manual valve operated by the electromagnetic means 3 is obtained as an output potential from the potentiometer 22 to the line 54, and this potential becomes the current shift position signal. The command shift signal and the current shift position signal are compared in a comparison section 25.
The operation of No. 5 will be specifically explained below using numerical values.

For example, assume that the current shift position signal is 3.15V and the command shift signal is 3V. The current shift position signal is input to the plus side of the first operational amplifier 55, and the command shift signal is input to the minus side, and the first operational amplifier 55 outputs 0.15V. This output is input to the negative side of the second operational amplifier 56, and since an offset voltage of 0.15V is input to the positive side of the second operational amplifier 56, there is an output of 0V from the second operational amplifier 56. This 0V output is input to the positive side of the third operational amplifier 57, and the third operational amplifier 57 and the transistor driver 2
6a, it is amplified 40 times and output on line 60. Since the input to the third operational amplifier 57 is 0V, the output to line 60 is also 0V. In addition, the 0V output of the second operational amplifier 56 is output from the fourth operational amplifier 58.
It is also input to the negative side of , and 0.3V is input to the positive side.
The fourth operational amplifier 58 outputs an output of 0.15V, which is input to the positive side of the fifth operational amplifier 59. This input is amplified 40 times by the fifth operational amplifier 59 and the transistor drive section 26b receiving its output, and outputted to the line 61 as a voltage of 12V. Therefore, the electromagnetic means (motor) 3 is rotated in the normal direction to move the potentiometer 22 interlocked with the electromagnetic means (motor) 3 to bring the current shift position signal closer to the command shift position signal and operate the manual valve.

When the potentiometer 22 moves and the current shift position signal becomes the same as the command shift signal, that is, when both become 3V, the output of the first operational amplifier 55 becomes 0V.
Then, the output of the second operational amplifier becomes 0.15V, so the output to line 60 becomes 6V. On the other hand, the output of the fourth operational amplifier 58 is 0.15V, so the line 61
Since the output of line 60 and line 61 are both 6V, the electromagnetic means 3 stops operating.
That is, the electromagnetic means 3 is driven so that the current shift position signal matches the command shift signal, and the manual valve is operated accordingly so as to reach the commanded shift position.

In this embodiment, a safety circuit 23 is also provided, which stops the power supply when the current shift position signal becomes 0 due to disconnection or malfunction of the potentiometer 22, or when a high voltage higher than the specified value is applied. Cut off,
This is intended to prevent the electromagnetic means 3 from running out of control. The output line 54 of the potentiometer 22 to which the current shift position signal is output is connected to the negative side of the first comparator 62 and the positive side of the second comparator 63, and is connected to the positive side of the first comparator 62. is a signal that is slightly larger than the upper limit value of the current shift position signal (approximately
4.7V), and a signal (approximately 0.3V) that is slightly smaller than the lower limit of the current shift position signal is input to the negative side of the second comparator 63.

Therefore, for example, when the wiring of the potentiometer 22 is disconnected and the voltage on the line 54 becomes 0V, the positive input of the first comparator 62 is 4.7V and the negative input is 0V, so the first comparator 62 The output is HIGH, but since the positive input of the second comparator 63 is 0V and the negative input is 0.3V, the output of the second comparator 63 is LOW, and the control is transmitted from the line 64 that combines the outputs of both comparators. Output terminal CO
The level of is Low. Furthermore, when an abnormal voltage (for example, 5V) is output to the line 54 due to the shorting of the potentiometer 22, the output of the first comparator 62 becomes LOW, and even if the output of the second comparator is HIGH, the control output is output. The level of terminal CO becomes Low. Incidentally, when the current shift position signal is within the predetermined range (0.3 to 4.7V), the outputs of the first comparator 62 and the second comparator 63 are both
At HIGH, the level of the control output terminal CO is HIGH.

The control output terminal CO is connected to the control input terminal CI of the power supply circuit 15 shown in FIG. Since the connection input terminal CI is connected to the base of the NPN transistor 36, when a Low signal is input from the control input terminal CI, the NPN transistor 36 is turned off.
Turns on when a HIGH signal is received. Therefore, Low
When the signal is received, the excitation coil 30 is de-energized, the main switching relay R is opened, and the power supply is cut off.

As shown in FIG. 7, the display circuit 19 uses each comparator 28 to compare the detection signal of the potentiometer 22 with each reference signal set by a plurality of resistors 27 connected in series, and calculates the potentiometer. meter 22
When the gear is at a predetermined gear shift position, a corresponding LED element or the like indicator lights up.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an example of the present invention, and FIG.
3 is a flowchart showing an example of a logic circuit of a controller, FIG. 4 is an electric circuit diagram showing a specific example of a power supply circuit, and FIG. FIG. 6 is an electric circuit diagram showing a specific example of the input circuit, FIG. 6 is an electric circuit diagram showing a specific example of the drive circuit, and FIG. 7 is an electric circuit diagram showing a specific example of the display circuit. 2... Automatic transmission, 3... Electromagnetic means, 4... Controller, 5... Manual control section, 6... Automatic control section, 7... Select switch, 15... Power supply circuit, 18... Drive circuit , 21...Ignition switch, 70...Shift command switch.

Claims (1)

[Claims] 1. An electromagnetic means for switching a manual valve of an automatic transmission to each shift position, a controller having a manual control section and an automatic control section and controlling the operation of the electromagnetic means, and a controller for controlling the operation position of the electromagnetic means in the manual control section. a select switch that issues a command; an ignition switch that turns on and off the supply of power supply voltage to the electromagnetic means, the controller, and the select switch; a vehicle speed detecting means that detects vehicle speed; An automatic transmission comprising: a power supply voltage circuit that maintains supply of power supply voltage to the electromagnetic means, the controller, and the select switch even when the ignition switch is off when the vehicle speed is other than zero. Machine gearbox.