JPH0650734Y2 - Stepping motor type integrated display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention sequentially rotates a stepping motor (magnetic pole) step by step by a drive signal output from a drive circuit unit connected to a speed pulse generator. The present invention relates to a stepping motor type integration display device which drives an integration meter in accordance with the above.

[Problems to be solved by conventional techniques and devices]

In the conventional stepping motor type integrated display device, a drive circuit unit including an amplifier and a logic circuit is simply connected to a speed pulse generator that generates a speed pulse each time the vehicle travels a certain distance, and this drive circuit unit is connected to this drive circuit unit. The magnetic pole is sequentially rotated step by step by the drive signal output from the drive circuit section, and the integrator is driven accordingly.

In this conventional stepping motor type integrated display device, since the phase of the magnetic pole is not fixed when the ignition switch of the vehicle is turned off, the 1-step magnetic pole is rotated even though the vehicle is not moving at the same time when the ignition switch is turned on. However, there is a drawback that the accumulator is driven in response to this and an obvious malfunction occurs.

In order to solve this drawback, the phase of the magnetic pole when the ignition switch is turned off is memorized and this phase is held when the ignition switch is turned on, and when the vehicle starts moving and the speed pulse is input to the drive circuit part. The magnetic pole may be rotated step by step from the phase held by the drive signal output from the drive circuit section, but for that purpose, a backup circuit must be attached,
Therefore, the device becomes very complicated and the cost becomes high, which is not practical.

The present invention provides a stepping motor type integrated display device that solves such drawbacks.

[Means for Solving the Problems]

The present invention will be described below with reference numerals attached to the drawings for easy comparison with the drawings showing an example of the present invention.

A speed pulse generator 1 that generates a speed pulse a each time the vehicle travels a certain distance, and a drive that converts the speed pulse a output from the speed pulse generator 1 into a drive signal b that enables the stepping motor to be driven. A stepping motor type integrated display device comprising a circuit unit 2 and a stepping motor type integrated display unit 3 comprising the stepping motor and an integrating meter which is rotated by driving the stepping motor. A delay circuit 4 for inputting a signal synchronized with the output speed pulse a as a clock signal c and delaying an ON signal d excited by the ignition switch being turned ON.
Input as the data signal e, and the ON signal d
Latch circuit 6 such as a D-type flip-flop for inputting the output of the monostable circuit 5 to
Further comprising: a reset signal output time s of the reset signal f output from the monostable circuit 5 that is excited by turning on the ignition switch, and the drive circuit unit 2 operates normally from the time when the ignition switch is turned on. Resetting the ON signal rising delay time u of the delay circuit 4 from when the ignition switch is turned on to when the ignition switch is turned on. The output Q of the latch circuit 6 is set to a time longer than the signal rising delay time v, and the output Q is output from the connection 7 to the clock signal input C of the drive circuit section 2 to the connection 8 on the output side. When the output signal g is inverted from the state of the output signal g set by the reset signal f, the drive signal b is stepped Those of the stepping motor type integrated display device, characterized in that connected through the connecting circuit 9 to be output to the motor type integrated display unit 3.

[Action]

Every time the vehicle travels a certain distance, the speed pulse generator 1 outputs the speed pulse a to the drive circuit unit 2, and the drive circuit unit 2 converts the speed pulse a into a drive signal b for driving the stepping motor of the stepping motor type integration display unit 3. Is output to the stepping motor type integration display unit 3.

When the vehicle is stopped, the ignition switch is OF
When this is turned ON from the state of F, the ON signal d in the "H" state is output to the monostable circuit 5 from the ignition switch unit 10 which outputs the ON signal d, and the monostable circuit 5 operates.

When the monostable circuit 5 is activated, the reset signal input R of the latch circuit 6 turns on the ignition switch from the monostable circuit 5.
After that, the reset signal f is output for the reset signal output time s.

That is, during the reset signal output time s, the output signal g set as the reset value from the output Q, for example, as shown in the embodiment, regardless of the input conditions of the clock signal input C and the data signal input D of the latch circuit 6. The signal in the “L” state is output to the connection circuit 9 of the drive circuit unit 2 and the drive signal b output from the drive circuit unit 2 is prevented from being output to the stepping motor type integrated display unit 3.

The reset signal output time s is set longer than the unstable time t from when the ignition switch is turned on to when the drive circuit unit 2 operates normally. Therefore, the vehicle is still stopped due to the unstable state of the drive circuit unit 2. Despite this, the drive signal b is output to the stepping motor type integration display unit 3 and the malfunction which drives the stepping motor type integration display unit 3 is prevented.

Further, when the ignition switch is turned on, the ignition switch section 10 outputs an ON signal d in the “H” state to the data signal input D of the latch circuit 6.

Therefore, when the reset signal output time s elapses, the output signal g is output from the output Q in synchronization with the rising of the clock signal C output from the drive circuit unit 2 to the clock signal input C, for example, "L" at the time of reset as in the embodiment. The output signal g inverted from "" to "H" is output to the connection circuit 9 of the drive circuit 2, and the drive signal b is output to the stepping motor type integration display unit 3 to drive the stepping motor type integration display unit 5.

That is, even if the ignition switch is turned on, the stepping motor type integration display unit 3 is not driven immediately, but the speed pulse generator 1 outputs the speed pulse a to the drive circuit unit 2 and the stepping motor type display unit 3 is not driven immediately. The integration display unit 3 is driven.

Further, if the rising edge of the reset signal f output from the monostable circuit 5 is delayed, the reset action does not work, and during this reset signal rising delay time v, the data signal e in the "H" state is input to the data signal input D. If it is output, since the drive circuit unit 2 is in an unstable state, a rising pulse is erroneously output to the clock signal input C, and the output signal g in the “H” state inverted from the output Q is output, resulting in malfunction. Ignition switch part 10
The ON signal d which is in the “H” state is not output as it is as the data signal e but is delayed by the ON signal rising delay time u set longer than the reset signal rising delay time v by the delay circuit 4. The data signal e is output to the data signal input D, and malfunction due to the reset signal rising delay time v is also prevented.

〔Example〕

 First, the structure of this embodiment shown in FIG. 1 will be described.

A drive circuit unit 2 is connected to a speed pulse generator 1 that outputs a speed pulse a each time the vehicle travels a certain distance, and the drive circuit unit 2 is connected to a stepping motor and a stepping unit that is rotated by the stepping motor. The motor type integration display unit 3 is connected, the clock signal input C of the D type flip-flop 6 is connected to the connection point 7 of the drive circuit unit 2, and the reset signal input R of this D type flip-flop 6 is connected to the ignition switch unit 10. Connected via the monostable circuit 5, the data signal input D of the D type flip-flop 6 is connected to the ignition switch unit 10 via the delay circuit 4, and the output Q of the D type flip-flop 6 is connected to the clock of the drive circuit unit 2. Input of AND circuit 9'provided as connection circuit 9 at connection point 8 on the output side from the connection point 7 with signal input C It is connected to one end of the terminal.

The drive circuit unit 2 connects the frequency divider 12 to the buffer 11 connected to the speed pulse generator 1, and the frequency divider 12 includes a logic circuit.
13 is connected, the other end of the input end of the AND circuit 9'is connected to the logic circuit 13, and the output end of the AND circuit 9'is connected to the amplifier 14 connected to the stepping motor type integration display unit 3.

In this embodiment, the output terminal of the buffer 11 is the connection point 7 to the clock signal input C of the D type flip-flop 6.

Next, with the vehicle stopped, set the ignition switch to OF
The operation of this embodiment when it is turned on from F will be described based on the time charts shown in FIG. 2 and FIG.

FIG. 2 shows a case where the initial value of the clock signal c synchronized with the speed pulse a output from the drive circuit unit 2 to the clock signal input C when the ignition switch is turned on is "H". On the contrary, FIG. 3 shows a case where the initial value is "L".

When the ignition switch is turned ON, the ON signal d which is in the "H" state from the ignition switch unit 10 is the monostable circuit 5
Then, the monostable circuit 5 outputs the reset signal f to the reset signal input R of the D-type flip-flop 6 in the “H” state with the delay of the reset signal rising delay time v and the reset signal output time s.

At the time of reset when the reset signal f in the "H" state is output, the D type flip-flop 6 is forcibly forced.
The output signal g of the "L" state is output from the output Q of the AND circuit 1 to one end of the input end of the AND circuit 9'of the connection point 8 of the drive circuit unit 2 and is output to the other end of the input end of the AND circuit 9 '. The output of the logic circuit 13 is blocked, and the drive signal b is blocked from being output to the stepping motor type integration display unit 3.

The reset signal rise delay time v occurs because it is not an ideal circuit, and the reset signal output time s is longer than the unstable time t from when the ignition switch is turned on until the drive circuit unit 2 operates normally. It is set.

Therefore, while the drive circuit unit 2 is in an unstable state, the drive signal b to the stepping motor type integration display device 3 is blocked and malfunction is prevented.

Further, when the ignition switch is turned on, the ON signal d in the “H” state is output from the ignition switch unit 10 to the data signal input D of the D type flip-flop 6 after being delayed by the ON signal rising delay time u by the delay circuit 4.

By outputting the delayed "H" state data signal e to the data signal input D, the clock signal input C
The output signal g is output from the output Q in synchronism with the clock signal c which is output to the output Q.

Since this ON signal rising delay time u is set longer than the reset signal rising delay time v at which the reset action does not work, this ON signal rising delay time u
Since the data signal e in the "H" state is not output to the data signal input D until the time elapses, the output signal g output from the output Q is the signal in the "L" state as in the reset. Therefore, the output of the drive signal b to the stepping motor type integration display unit 3 is blocked by the AND circuit 9 ', and a malfunction is prevented, as in the reset operation.

When the ignition switch is turned on, the initial value of the clock signal c of the clock signal input C of the D type flip-flop 6 is that the speed pulse is a
It depends on whether it was in the "H" state or the "L" state when turned OFF. FIG. 2 shows the case of being in the “H” state, that is, the case where the initial value is the “H” state, and FIG. 3 shows the case of being in the “L” state.

However, as shown in FIG. 2, when it is in the “H” state, it rises to the “H” state after the instability time t of the drive circuit unit 2 has elapsed.

When the vehicle starts to move after the ignition switch is turned on, the speed pulse generator 1 outputs the speed pulse a to the drive circuit unit 2, and the clock signal c synchronized with the speed pulse a is output to the clock signal input C.

The output signal g which is in the "H" state and is output to the data signal input only in synchronization with the rising edge of the clock signal c.
Is output from the output Q to the AND circuit 9 '. Since the input of the AND circuit 9'is inverted from the "L" state to the "H" state at the time of reset, the output of the logic circuit 13, that is, the drive signal b is output to the stepping motor type integrated display unit 3 to display the stepping motor type integrated display. The part 3 is driven.

Therefore, the stepping motor type integration display unit 3 is driven only when the vehicle moves.

This embodiment does not maintain the phase of the stepping motor (magnetic pole) of the stepping motor type integrated display unit 3 when the ignition switch is turned off, and may cause a drive error of one step, but when the ignition switch is turned on Prevents the stepping motor type integrated display unit 3 from being driven reliably and drives the stepping motor type integrated display unit 3 for the first time after the vehicle starts to move, so that the error of one step of the stepping motor type integrated display unit 3 is visually recognized. The person does not notice.

The configuration is not limited to the configuration of this embodiment, and the connection point 7 of the clock signal input C of the D type flip-flop 6 is not limited to this.
May be connected to any part of the drive circuit section 2, and may be directly connected to the input terminal of the drive circuit section 2, that is, the speed pulse generator 1, and the output Q of the D-type flip-flop 6 is at this connection point 7. You can connect to any output side.

The connection circuit 9 provided at the connection point 8 between the output Q of the D-type flip-flop 6 and the drive circuit unit 2 is not limited to the AND circuit 9 ', but the output signal g is inverted with respect to the signal set at reset. Any configuration may be adopted as long as it can output the drive signal b only in such a case.

Further, although the D-type flip-flop 6 is used as the latch circuit 6 in the present invention, any circuit having an operation equivalent to this may be used.

[Effect of device]

Since the present invention is configured as described above, it has a simple configuration in which the existing stepping motor type integration display device is simply connected to the latch circuit connected to the ignition switch section via the monostable circuit and the delay circuit. It is a stepping motor type integrated display device with excellent practicability that can reliably prevent a malfunction at a glance that the stepping motor integrated display unit is mistakenly driven when the ignition switch is turned on at a low cost. .

In addition, even if the drive circuit is unstable for a while after the ignition switch is turned on, or the reset signal output to the reset signal input of the latch circuit is delayed, the stepping motor type integration Since the malfunction of the display unit is prevented and the stepping motor type integrated display unit is driven for the first time after the vehicle starts to move, even if the phase of the stepping motor (magnetic pole) is not held even when the ignition switch is turned off, the phase shifts. When the stepping motor type integrated display unit starts up, even if there is an error in the rotation of the magnetic pole for one step, that is, when the stepping motor type integrated display unit is driven in error, the vehicle is driven after it starts to move for a certain distance, not when the ignition switch is turned on. Therefore, it is extremely practical because it does not make the viewer feel it is a malfunction. It becomes a stepping motor type integrated display device.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a schematic configuration diagram, and FIG. 2 is a time chart of each signal when the initial value of the clock signal input of the D type flip-flop is in the “H” state. FIG. 3 is a time chart formula explanatory diagram of each signal when the initial value of the clock signal input of the D-type flip-flop is in the “L” state. C ... clock signal input, R ... reset signal input, D ... data signal input, Q ... output, a ... speed pulse, b ... drive signal, c ... clock signal, d ... ON signal, e ... data signal, f ... reset Signal, g ... Output signal, s ... Reset signal output time, t ... Unstable time, u ... ON signal rise delay time, v ... Reset rise delay time, 1 ... Speed pulse generator, 2 ... Drive circuit section, 3 ... Stepping motor integrated display, 4 ... Delay circuit, 5 ... Monostable circuit, 6
... Latch circuit, 7 ... Connection point, 8 ... Connection point, 9 ... Connection circuit.

Claims (1)

[Scope of utility model registration request] 1. A speed pulse generator for generating a speed pulse each time a vehicle travels a certain distance, and a drive for converting a speed pulse output from the speed pulse generator into a drive signal for driving a stepping motor. In the stepping motor type integration display device including a circuit part and a stepping motor type integration display part including the stepping motor and an integrating meter that is rotated by driving the stepping motor, the speed pulse generator outputs the speed pulse generator. A monostable circuit in which a signal synchronized with the speed pulse is input as a clock signal, and the output of a delay circuit that delays the ON signal that is excited when the ignition switch is turned ON is input as a data signal and the ON signal is input. Such as a D-type flip-flop that inputs the output of The reset circuit output time s of the reset signal output from the monostable circuit that is excited by turning on the ignition switch, and the drive circuit section operates normally from the time when the ignition switch is turned on. Set to a time longer than the unstable time t until the start of the reset signal rising delay time u of the delay circuit from the time when the ignition switch of the reset signal output from the monostable circuit is turned on A time longer than time v is set, and an output signal output from this output Q is set by a reset signal at a connection point on the output side of a connection point of the output Q of the latch circuit with the clock signal input C of the drive circuit section. Stepping motor type integrated display unit for displaying the drive signal when it is inverted from the state of the output signal A stepping motor type integrated display device characterized by being connected via a connection circuit for outputting to.