JP2590951Y2 - Transmission control device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission control device for controlling gear change of a transmission such as a bus or a truck.

[0002]

2. Description of the Related Art Conventionally, in order to electrically control a gear switching operation of a transmission such as a bus or a truck,
Various transmission control devices have been used (for example, see Japanese Utility Model Laid-Open No. 3-96922). FIG.
1 is a circuit diagram of a conventionally used transmission control device. In FIG. 3, when a clutch (not shown) is brought into a contact state by operating a clutch plate (not shown), a switch 301 is opened, and a control terminal of a central processing unit (CPU) 303 as a signal conversion unit is connected to a control terminal. Resistor 3
02, a high level signal is input. CPU303
In response to the high level signal, decodes the input signal V _i corresponding to the position of the change lever (not shown), and outputs a control signal V _o from the output terminals. Transistors 305 ₁ to 305 3 constituting transmission control section 307
05 _n receives the control signal _{V o} through the corresponding resistors ₃₀₄ 1 _{~304 n,} turned on or off in accordance with the signal level of the control signal _{V o.} Thereby, the transmission control magnet valves 306 ₁ to 306 _n connected to the on-state transistors 306 _{1 to} 306 _n.
306 _n are driven, it is set to a gear corresponding to the position of the change lever.

[0003]

Since the conventional transmission control device is configured as described above, when the CPU 303 as the signal conversion unit performs an abnormal operation such as a runaway or a malfunction, the position of the change lever is determined. unrelated abnormal control signal V _o is output. Therefore, transistors 305 _{1 to} 305 _n that are different from the transistors 305 _{1 to} 305 _{n to} be driven are driven. Therefore, there is a problem that the gear is suddenly switched from the neutral position to the second speed position and the vehicle is suddenly started even though the change lever is not operated.

The present invention has been made in view of the above problems, and has as its object to provide a transmission control device capable of preventing a gear from being inadvertently switched even when a signal converter malfunctions.

[0005]

A transmission control device according to the present invention converts a signal corresponding to a position of a change lever into a predetermined control signal and outputs the control signal.
A switch that is operated to switch to a first state when the gear is changed, and to a second state when the gear is not changed;
A gate signal generator for outputting a first signal and a second signal when in the state and the second state, respectively, passing and outputting the control signal in response to the first signal and responding to the second signal; And a transmission control unit that controls transmission gear switching based on the control signal output from the gate unit.

[0006]

The signal converter converts an input signal corresponding to the position of the change lever into a predetermined control signal and outputs it. The gate signal generation unit outputs a first signal when performing a gear switching operation, and outputs a second signal when not performing a gear switching operation. The gate unit passes and outputs the control signal in response to the first signal, and shields the control signal in response to the second signal. The transmission control section controls gear switching in response to a control signal from the gate section.

[0007]

FIG. 1 is a circuit diagram showing an embodiment of the present invention. In FIG. 1, one terminal of a switch 101 that opens and closes in response to operation of a clutch plate (not shown) is grounded,
The other terminal is connected to the power supply _Vcc via the resistor 102. The input portion of the CPU103 of the signal conversion unit is input an input signal V _i corresponding to the position of the change lever (not shown), is configured to output a control signal V _o obtained by decoding the input signal V _i I have. The latch signal of the CPU 103 is supplied to a control terminal of the latch circuit 107. Control signal _{V o} through the latch circuit 107 is input to the gate circuit 108 as a gate portion. The output terminal of the gate circuit 108 is connected to the base terminals of the corresponding driving transistors 105 _{1 to} 105 _n via the resistors 104 _{1 to} 104 _n . The transistors 105 ₁ to
105 emitter of _n is grounded, and the collector magnet valve ₁₀₆ 1 - 106 _n for transmission control
It is connected to the. The resistors 104 _{1 to} 104 _n and the transistors 105 _{1 to} 105 _n constitute a transmission control unit 115.

On the other hand, the control terminal of the CPU 103 is connected to the base of the transistor 110 via the resistor 109. The emitter of the transistor 110 is grounded, the collector is connected to the power supply _Vcc via the resistor 111, and is connected to the base of the transistor 113 via the resistor 112. The emitter of the transistor 113 is grounded, and the collector is connected to the power supply V
_cc and to the control terminal of the gate circuit 108. Resistors 109, 111, 112, 11
4 and the transistors 110 and 113 constitute a gate signal generator 116.

FIG. 2 is a flowchart showing the operation of the CPU 103. Hereinafter, the operation of this embodiment will be described with reference to FIGS. In order to switch gears (not shown), the switch 1 is first depressed by depressing the clutch plate.
01 is set to the closed state as the first state. In this state, the base of the transistor 110 is grounded via the resistor 109 and the switch 101.
The transistor 10 is turned off, and the transistor 113 is turned on. Therefore, a low-level signal as a first signal is supplied to the control terminal of the gate circuit 108, and the gate circuit 108
The control signal V _o becomes passed output ready from 103.

[0010] When the switching operation of the change lever in this state to a desired position, the input signal V _i corresponding to the position of the change lever is inputted to the CPU 103. CPU103
It may determine that the switch 101 is closed after the (201 in FIG. 2), and output holding control signal _{V o} obtained by decoding the input signal _{V i} (202 in FIG. 2), repeating this. At the same time, the CPU 103 outputs a latch signal to the latch circuit 107. Thus, the control signal _{V o} is latched by the latch circuit 107. Since the gate circuit 108 is in a state capable of passing the input signal and outputting the same, the latch circuit 10
7 and latched by the control signal _{V o} is supplied to the transistor ₁₀₅ 1 to 105 _n through the gate circuit 108.
Therefore, transistor high level signal is input in the control signal _{V o} (e.g. transistor ₁₀₅ 1-10
Only 5 ₃ ) is turned on, and the other transistors 105
₂ , 105 _{4 to} 105 _n are turned off.

[0011] As a result, only the transmission control magnet valve ₁₀₆ 1, 106 ₃ is driven, the gear is set at a position corresponding to the position of the change lever.
Thereafter, when the switch 101 is opened as the second state by returning the clutch plate, the transistor 110 is turned off.
Is turned on, the transistor 113 is turned off, and the control terminal of the gate circuit 108 is supplied with a high-level signal as a second signal. In this state, the control signal _{V o} corresponding to the position of the change lever is output from the CPU 103 (203 in FIG. 2), since the gate circuit 108 is in the blocking state, the control signal _{V o} is a gate circuit from CPU 103 108 through the transistor ₁₀₅ 1 to 105 _n
, And all of the transistors 105 _{1 to} 105 _n are turned off.

Therefore, when the gear is not switched (when the clutch is engaged).
In addition, it is possible to prevent an abnormal situation such as suddenly shifting from neutral to the second speed and suddenly starting. According to the present embodiment as described above, so the gate circuit 108 outputs passes the control signal V _o when switching gears addition, since the non-switching gear and configured to shield the control signal V _o, Even if the CPU 103 generates an abnormal state such as a runaway or a malfunction, when the gear is not switched,
It is possible to prevent abnormal gear switching.

Further, since the switch 101 is opened and closed by operating the clutch plate, the gear switching operation and the abnormal gear switching can be prevented only by performing the same operation as in the manual type automobile. Therefore, the operation is extremely convenient. In the present embodiment, the signal converter is configured by the CPU 103, but the present invention can be applied to a case where the signal converter is configured by hardware such as a decoder.

The switch 101 is opened and closed in conjunction with the depression of the clutch plate.
It is also possible to arrange the switch 101 to open and close independently of the clutch plate, for example, by disposing the switch 1 on a change lever and opening and closing it manually. Further, the transistor 11
Numerals 0 and 113 are provided to prevent the gate circuit 108 from being destroyed by applying a hazard to the control terminal of the gate circuit 108. It is also possible to connect the control terminal 108 to the power supply _Vcc via the resistor 102.

Although the gate circuit 108 performs the blocking operation when the switch 101 is open, the gate circuit 108 may perform the blocking operation when the switch 101 is closed. Switch 1
01 can be configured not only with a mechanical switch but also with an optical switch configured with a photo interrupter or the like, a magnetic switch using a Hall element or the like. still,
Latch circuit 107, by latching a control signal _{V o} output from the CPU 103, the control signal but is provided in order to reliably supply the control signal _{V o} to the transmission control unit 115, which is output from the CPU 103 in the case of the V _o can be used as it is, the latch circuit 10
7 is unnecessary.

[0016]

According to the transmission control device of the present invention, it is possible to prevent the gear from being inadvertently switched due to the abnormal operation of the signal converter when the gear is not switched, and to prevent the occurrence of an abnormal situation such as sudden start. This can be prevented.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 3 is a circuit diagram showing a conventional transmission control device.

[Explanation of symbols]

 101 ... switch 103 ... CPU as a signal conversion unit 108 ... gate circuit as a gate unit 115 ... transmission control unit 116 ... gate signal generation unit

Claims (1)

(57) [Scope of request for utility model registration] A signal conversion unit for converting an input signal corresponding to a position of a change lever into a predetermined control signal and outputting the control signal; a signal conversion unit configured to switch to a first state when the gear is switched and to a second state when the gear is not switched. And a gate signal generator for outputting a first signal and a second signal when the switch is in the first state and the second state, respectively, and passing the control signal in response to the first signal. A transmission control, comprising: a gate section that outputs and blocks the control signal in response to the second signal; and a transmission control section that controls switching of a transmission gear based on the control signal output from the gate section. apparatus.