JP2523697Y2 - Driving device for cross coil type instrument - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a cross-type device for driving a plurality of cross-coil instruments for displaying individual driving information and displaying a plurality of driving information on a plurality of cross-coil instruments, for example, in a vehicle such as an automobile. The present invention relates to a driving device for a coil type instrument.

[0002]

2. Description of the Related Art FIG. 11 is a block diagram showing a configuration of a conventional driving device for a cross coil type instrument. In FIG. 11, reference numeral 1 denotes a microcomputer as control means, which is a speed signal S _S representing a traveling speed supplied from each sensor (not shown), a revolution signal S _R representing an engine revolution, a remaining fuel amount. temperature signal S _T representing the temperature of the cooling water of the radiator for cooling the fuel signal S _F and the engine represents a
Are collectively processed to calculate and output data (serial data) D for driving each of the instruments 3 to 6 described later.

Reference numeral 2 denotes a driver circuit, and each of the instruments 3 to 3 is based on data D supplied from the microcomputer 1.
6, and calculates a sine duty pulse and a cosine duty pulse for driving the motor 6 and cyclically outputs them in a time-division manner. Reference numeral 3 denotes a speedometer (hereinafter also referred to as a meter), 4 denotes a rotation speed meter (hereinafter also referred to as a meter), 5 denotes a fuel gauge (hereinafter also referred to as a meter), and 6 denotes a thermometer (hereinafter referred to as a meter).
Also called an instrument. ), Each of the instruments 3 to 6 is driven by a signal output from the driver circuit 2 and displays corresponding information.

FIG. 12 is a timing chart in which data transmitted by a microcomputer is decomposed into respective data. In FIG 12, D _DS speed data for driving the speedometer 3, D _DR rotational speed data for driving the rotation speed meter 4, D _{DF
Represents} fuel data for driving the fuel gauge 5, and _DDT represents temperature data for driving the thermometer 6. T _C Each data D _DS, D _DR,
It indicates the cycle number 10msec for outputting D _DF and D _DT, the data D _DS, D _DR, D _DF and D _DT are sent cyclically in equal time.

FIGS. 13 (a) and 13 (b) are illustrations showing the movement of the hands of each instrument. In FIG. 13, P is a pointer, p
_{0 to} p ₆ indicate the position of the pointer P.

Next, the operation will be described. First, when each signal S _S , S _R , S _F and S _T is supplied from each sensor to the microcomputer 1, the microcomputer 1 calculates each instrument based on each signal S _S , S _R , S _F and S _T. Since data D for driving 3 to 6 is calculated and transmitted,
The drive circuit 2 supplies the supplied data D (each data D _DS ,
D _DR, and sends a time-division cyclically signal for driving each instrument 3-6 based on D _DF and D _DT) for each 8msec (2msec × 4).

Accordingly, each of the instruments 3 to 6 indicates each measured value with the pointer P according to the supplied signal.
By visually recognizing the positions and scales of the pointers P to No. 6, each driving information can be obtained.

[0008]

The driving device for a conventional cross-coil type instrument is constructed as described above.
That is, each data D _DS , D
_{Since DR} , _DDF and _DDT are evenly and cyclically sent out, the pointers P of the fuel gauge 5 and the thermometer 6 displaying the slowly changing measured values are indicated by dotted lines as shown in FIG. The measurement value can be displayed by slowly moving from the position p ₀ indicated by to the position p ₆ indicated by the solid line via the positions p ₁ , p ₂ , p ₃ , p ₄ and p ₅ , but the measurement value fluctuates drastically. A pointer P such as a speedometer 3 and a tachometer 4 that displays the
As shown in 3 (b), it will be displayed measurements rapidly moved to the position p ₆ shown by the solid line via the position p _2, p ₄ from the position p _0.

Therefore, the speedometer 3, the tachometer 4, etc., which display a measurement value that fluctuates greatly, have a disadvantage that the response of the display is delayed, and the indication P of the indication change of the measurement value cannot be displayed smoothly. .

The present invention has been made in order to solve the above-mentioned inconvenience, and it is possible to display the indication change of the measurement value which fluctuates drastically as a smooth display change by the pointer like the measurement value which fluctuates slowly. It is intended to provide a driving device for a cross-coil type instrument as described above.

[0011]

In order to achieve the above object, a driving device for a cross-coil type instrument according to the present invention is provided with a control means which is supplied with data which fluctuates rapidly among a plurality of data supplied. In this configuration, the data is transmitted at a number of times greater than the number of times of transmission of the data having a moderate fluctuation among the plurality of data.

[0012]

According to the present invention, the driving circuit of the driving device of the cross-coil type instrument updates the signal for driving each instrument based on the data sent from the control means. That is, the data for driving the meter is updated earlier in the data with a large fluctuation compared to the data with a small fluctuation, so that the change of the pointer indicating the driving information becomes gentle (smooth).

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a driving device for a cross-coil type instrument according to an embodiment of the present invention.
The same or corresponding parts are denoted by the same reference characters and description thereof is omitted.

In FIG. 1, reference numeral 1a denotes a ROM storing a control program, 1b denotes a RAM, 1c denotes an analog / digital converter (A / D converter) for converting an analog signal into a digital signal, and ROMs 1a to 1a / D converter 1
c constitutes the microcomputer 1.

2 is a dynamic drive circuit, 7 is an interface circuit, L _C is a clock data line for transmitting clock data D _C , L _L is a latch data line for transmitting latch data D _L , and L _D is data D _D data lines, L _S is the standby data line for transmitting a standby data D _S, L _R is the reset data D _R
, The reset data lines L _S1 , L _S2 , L _S3 and L _S4 are sine duty pulses D _S1 , D _S2 , D _S3 ,
Sign duty pulse line, L _C1 for transmitting D _S4,
L _C2, L _C3 and L _C4 cosine duty pulse line for transmitting cosine duty pulse _{D C1, D C2, D C3} , D C4, COM S is sign duty common line, COM _C represents a cosine duty common line.

FIG. 2 is a schematic diagram showing the configuration of the RAM.
In FIG. 2, C indicates a counter area in which a counter value n described later is written. T indicates a timer area,
The timer value t is written.

FIG. 3 is a flowchart showing control of the microcomputer. FIG. 4 is a flowchart showing a speed or rotation speed interruption routine. In the speed or rotation speed interrupt routine shown in FIG. 4, when the microcomputer 1 starts the control, a period is appropriately measured based on a pulse from a sensor, and the measured period is taken into the RAM 1b.

FIG. 5 is a flowchart showing a processing routine for speed or rotation speed data. FIG. 6 is a flowchart showing a processing routine for fuel or temperature data.
FIG. 7 is a flowchart showing the timer interrupt routine. The timer interrupt routine shown in FIG. 7 is performed every 8 msec.

FIG. 8 is a timing chart in which data transmitted by the microcomputer is decomposed into each data.
In FIG. 8, _DDS is speed data for driving the speedometer 3,
D _DR rotational speed data for driving the rotation speed meter 4, D _DF fuel drives the fuel gauge 5 data, D _DT indicates the temperature data for driving the thermometer 6. T _C1 indicates a cycle for outputting each data D _DS , D _DR , D _DF and D _DT and is 96 msec,
One piece of data D _DS , D _DR , D _DF and D _DT is transmitted at equal time.

FIG. 9 is a waveform diagram showing serial data transmitted by the microcomputer. In FIG. 9, T _C2
Indicates a time of 8 msec for sending one data, and each data includes one address data corresponding to each of the instruments 3 to 6.

FIG. 10 is a waveform diagram showing signals that the dynamic driver circuit cyclically outputs to drive each instrument. In FIG. 10, T _C3 indicates a time of 2 msec for outputting one signal.

Next, the operation will be described. First, for example, when the ignition switch is turned to the accessory position, the microcomputer 1 starts control, sets the counter value n to zero, and stores it in the counter area C of the RAM 1b (step ST1).

[0023] Then, since the start resets the timer (step ST2), the timer value t based on the clock data D _C is minutely written to the timer area T.
Next, it is determined whether or not the ignition switch is turned off (step ST3). If the ignition switch is turned off, a return-to-zero process for positioning the hands P of the instruments 3 to 6 at the zero position is performed (step ST4).

Then, after step ST4 or if the ignition switch is turned on in the determination of step ST3, it is determined whether 8 msec has elapsed based on the timer value t (step ST5), and if 8 msec has not elapsed, The process returns to step ST3. Further, if the elapsed 8msec is determined in step ST5, process the speed data D _DS (step ST
6) After processing the rotational speed data _DDR (step ST
7) It is determined whether 72 msec has elapsed based on the timer value t (step ST8). If 72 msec has not elapsed, the process returns to step ST3.

[0025] However, if the elapsed 72msec is determined in step ST8, it processes the fuel data D _DF (step ST
9), after processing the temperature data D _DT (step ST10),
It returns to step ST3. Therefore, step every 8 msec
Steps ST5 and ST6 are performed, and steps ST9 and ST6 are performed every 72 msec.
Ten is done.

Next, the speed or rotation speed interrupt routine will be described. When the microcomputer 1 starts the control, the speed or rotation speed interrupt routine appropriately measures and captures the cycle based on the pulse from the sensor, writes the cycle into the RAM 1b, and returns (step ST21).

Next, a processing routine for speed or rotation speed data will be described. This processing routine for speed or rotation speed data calculates a period based on a predetermined number of period data from the latest cycle data fetched in the speed or rotation speed interrupt routine (step ST31), and converts the obtained period into angle data. After that (step ST32), the data is converted into sine data and cosine data and stored in the RAM 1b (step ST33), and the process returns. Therefore, RA
The speed or rotation speed data D _DS and D _DR of _M1b are updated.

Next, a processing routine for fuel or temperature data will be described. Processing routine of the fuel or the temperature data, fuel or temperature signal S _F, the S _T converted A / D (step ST41), and the averaging process based on a predetermined number of data from the latest data (step ST42) After the calculated average value is converted into sine data and cosine data and stored in the RAM 1b (step ST43), the process returns. Therefore, the fuel or temperature data D _DF and D _{DT in the} RAM 1b are updated.

Next, transmission of each data will be described.
As described above, each data D _DS , D _DR , D _DF and D _DT
Is processed while the timer interrupt routine is started, it is determined whether the counter value n is 2 (step ST5).
1), the counter value n is equal 2, delivering fuel data D _DF (step ST52).

Next, the counter value n is determined in the judgment of step ST51.
Is not 2, it is determined whether the counter value n is 6 (step ST53). If the counter value n is 6, temperature data _DDT is sent out (step ST54). Then, if the counter value n is not 6 in the determination in step ST53, it is determined whether the counter value n is 1 (step ST55). If the counter value n is 1, speed data _DDS is transmitted (step ST55). ST56).

Next, in the determination of step ST55, the counter value n
Is not 1, it is determined whether the counter value n is 4 (step ST57). If the counter value n is 4, the process proceeds to step ST56. If the counter value n is not 4 in the determination in step ST57, it is determined whether the counter value n is 8 (step ST58). If the counter value n is 8, the process proceeds to step ST56.

Next, in the determination of step ST58, the counter value n
Is not 8, it is determined whether the counter value is A (hexadecimal) (step ST59). If the counter value n is A, the process proceeds to step ST56. Then, unless the counter n value is determined in step ST59 is A, after sending the rotational speed data D _DR (step ST60), the counter value n is determined whether the B (16 hex) (step ST61), Counter value n
Is not B or the counter value n is increased by 1 after steps ST52, ST54 and ST56 (step ST62), and the routine returns.

Next, the counter value n is determined in step ST61.
If B is equal to B, the counter value n is set to zero (step ST63), and the process returns. Therefore, the data D _DS , D _DR , D _DF and D _DT sent from the microcomputer 1 to the dynamic drive circuit 2 are FIG.

As described above, the microcomputer 1 sends the data D _DS , D _DR , D _DF, and D _DT to the dynamic drive circuit 2 at the timing shown in FIG. 9. The signals for driving the instruments 3 to 6 are cyclically output at the timing shown in FIG.

Therefore, each of the instruments 3 to 6 indicates each measured value with the pointer P by the supplied signal.
By visually recognizing the positions and scales of the pointers P to No. 6, each driving information can be obtained.

As described above, according to this embodiment, the microcomputer 1 sends out the data that fluctuates greatly in one cycle more times than the number of times of sending out the data that fluctuates slowly. Since the rapidly changing data is updated earlier than the slowly changing data, the instruction change of the rapidly changing measured value is the same as that of the slowly changing measured value, that is, FIG.
As shown in (5), the pointer P can be displayed as a smooth display change.

In the above embodiment, the microcomputer 1 sends each data D _DS , D _DR , D _DF and D _DT to the dynamic drive circuit 2 at the timing shown in FIG. By changing the program, the speed and / or speed data D _DS , D _DR are converted into fuel and / or temperature data D _DF , D _DT.
It can be transmitted more times than it is.

[0038]

As described above, according to the present invention, the control means is used to transmit the data which fluctuates rapidly among the plurality of data to be supplied and to transmit the data which fluctuates slowly among the plurality of data to be supplied. Since the data is sent out more times than the number of times, the data in which the driving circuit fluctuates rapidly is updated earlier than the data in which the fluctuation fluctuates slowly.

Therefore, there is an effect that the indication change of the measurement value which fluctuates drastically can be displayed as a smooth display change by the pointer like the measurement value which fluctuates slowly.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a driving device for a cross-coil type instrument according to an embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating a configuration of a RAM.

FIG. 3 is a flowchart showing control of the microcomputer.

FIG. 4 is a flowchart showing a speed or rotation speed interrupt routine.

FIG. 5 is a flowchart showing a processing routine for speed or rotation speed data.

FIG. 6 is a flowchart showing a processing routine for fuel or temperature data.

FIG. 7 is a flowchart showing a timer interrupt routine.

FIG. 8 is a timing chart in which data transmitted by the microcomputer is decomposed into each data.

FIG. 9 is a waveform diagram showing serial data transmitted by the microcomputer.

FIG. 10 is a waveform diagram showing signals that the dynamic driver circuit cyclically outputs to drive each instrument.

FIG. 11 is a block diagram showing a configuration of a conventional driving device for a cross-coil type instrument.

FIG. 12 is a timing chart in which data transmitted by the microcomputer is decomposed into each data.

FIGS. 13A and 13B are explanatory diagrams showing the movement of the hands of each instrument.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Microcomputer 1a ROM 1b RAM 1c Analog-digital converter 2 Dynamic drive circuit 3 Speedometer 4 Revolution meter 5 Fuel gauge 6 Thermometer 7 Interface circuit D _DS speed data _DDR revolution data D _DF fuel data D _DT temperature data

Claims (2)

(57) [Scope of request for utility model registration] A control unit for converting a plurality of supplied data into serial data by a conversion unit and transmitting the serial data from a transmission unit;
A driving circuit for driving a plurality of cross-coil instruments in a time-division manner based on the serial data from the control means, wherein the control means comprises: Wherein the data having a large fluctuation within the plurality of data is transmitted more times than the number of times of transmitting the data having a moderate fluctuation among the plurality of supplied data. 2. The driving device for a cross-coil type instrument according to claim 1, wherein the plurality of data includes speed-change data and speed-change data of an engine.
A driving device for a cross-coil type instrument, wherein the data having a gradual fluctuation is fuel data and temperature data.