JP3343149B2 - Control device for vehicle electrical components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a vehicle electrical component, and more particularly to a control device for a vehicle electrical component which is constituted by a digital circuit and can be easily integrated.

[0002]

2. Description of the Related Art Conventionally, a microcomputer such as an automobile is provided with a microcomputer, and electrical components, for example, a swing angle of a pointer of an indicator such as an engine tachometer, and an engine mounted on the vehicle by the microcomputer. Is detected (for example, Japanese Utility Model Laid-Open No. 4-90972).

An indicator such as an engine tachometer includes two orthogonal coils, and a magnetic field induced by a current applied to the two coils rotates a pointer having a small bar-shaped magnet attached thereto. A cross-coil indicating instrument is used. A conventional example of a method of driving the cross-coil indicating instrument will be described with reference to FIGS.

FIG. 14 is a block diagram showing the configuration of the meter driving system 1.

In the drawing, reference numeral 2 denotes a meter driving system 1
, 3a, 3
b, 3c and 3d are digital / analog (hereinafter, D /
A), reference numerals 4a, 4b, 4c and 4d indicate DC amplifiers, and reference numeral 5 indicates a cross-coil indicating instrument. The cross-coil indicator 5 includes a coil A and a coil B and a pointer (not shown).

In the meter driving system 1 configured as described above, the digital signal output from the microcomputer 2 is converted into an analog value by the D / A converters 3a to 3d, and further amplified by the DC amplifiers 4a to 4d and crossed. It is supplied to the coils A and B of the coil type indicator 5.

FIG. 15 shows A plus (hereinafter A +) of coil A.
Terminal) and an A-minus (hereinafter A-) terminal,
And a voltage waveform supplied to each of a B plus (hereinafter, referred to as B +) terminal and a B minus (hereinafter, referred to as B-) terminal of the coil B, and a current waveform supplied to the coils A and B by the voltage waveform. Show.

In FIG. 15, at time 0 to t ₂ , the A- terminal is set to zero potential (see FIG. 15 (b)), and the A + terminal is provided with an analog voltage which forms a sine wave curve on the time axis (see FIG. 15).
(See (a)), the A +
A current having a phase advanced by 90 ° from the analog voltage is supplied from the terminal to the A− terminal (see FIG. 15E).
The B + terminal of the coil B, and supplies the analog voltage as a cosine wave curve in ₁ hour 0 to t (see FIG. 15 (c)), a sine wave curve in t ₁ ~t ₂ hours to B- terminal By applying an analog voltage (FIG. 15)
15 (d)), a current having a waveform shown in FIG. 15 (e) is applied to the coil B, and the pointer is set to an intermediate position of the maximum swing angle, for example, 1
Rotated continuously up to 80 °.

Similarly, between time t ₂ and time t ₃ , the hands are continuously rotated from 180 ° to 360 ° by applying the analog voltage shown in FIG. 15 to each terminal.

FIG. 16A shows a first conventional example of a judgment circuit for judging whether or not a rotating shaft of a DC motor mounted on a vehicle has rotated normally.

In FIG. 16A, a digital signal for energizing the DC motor 9 is output from the microcomputer 7, and the output digital signal is output to the motor driver 8a.
The signal is converted into an analog signal at 8b and supplied to the DC motor 9. The rotating shaft of the DC motor 9 is rotated by the supplied analog signal, and the potentiometer 10 mounted on the rotating shaft is rotated.

Next, when the microcomputer 7 stops outputting the digital signal for energizing the DC motor 9,
Potentiometer 1 arranged on the rotating shaft of DC motor 9
0, and compares the output voltage with the accumulated value of the digital signal for energizing the DC motor 9 stored in the storage circuit (not shown) of the microcomputer 7,
It is determined whether the rotating shaft of the DC motor 9 has normally rotated.

FIG. 16B shows a second conventional example of a judgment circuit for judging whether or not the rotating shaft of the DC motor 9 has rotated normally.

In FIG. 16B, the rotating DC motor 9
When the rotation is stopped, the microcomputer 7 reads the back electromotive force generated in the DC motor 9 from the output of the current sensor 11 disposed between the motor driver 8a and the DC motor 9, and Based on the value of the electromotive force, it is determined whether or not the rotating shaft of the DC motor 9 has normally rotated as in FIG. 16A described above.

[0015]

However, the above-described method for driving a cross-coil type indicator according to the prior art requires a number of expensive DC amplifiers, which increases the manufacturing cost of the meter drive system and increases the cost of the digital circuit. Since analog circuits are mixed, there is a disadvantage that it is difficult to form an integrated circuit for cost reduction.

On the other hand, in the conventional method for detecting the rotational state of a DC motor, since expensive potentiometers and current sensors are used, there is a problem that the cost of electrical components increases.

The present invention has been made in order to solve such a conventional problem. By converting an analog circuit into a digital circuit, it is easy to integrate the whole system into an integrated circuit, and the cost of vehicle electrical components is reduced. It is an object of the present invention to provide a control device for a vehicle electrical component capable of promoting down.

[0018]

In order to achieve the above object, the present invention relates to a vehicle in which a pointer is turned by a combination of magnetic fields induced in a first coil and a second coil which are arranged crosswise. A controller for controlling the swing angle of the pointer of the meter for a vehicle, wherein the swing angle of the pointer corresponding to a physical quantity detected by a sensor is calculated, and the first coil is energized from the swing angle. a signal related to the power supply amount of current, the signal related to the power supply amount of current supplied to the second coil,
Control signal generating means for generating and outputting a signal relating to an energizing direction to the first coil and a signal relating to an energizing direction to the second coil; and a current flowing through the first coil output from the control signal generating means A first pulse width modulating means for generating and outputting a pulse having a duty cycle based on a signal relating to the amount of energization, and a current flowing through the second coil output from the control signal generating means
And a second pulse width modulator having a duty cycle based on a signal related to the amount of current supplied and generating and outputting a pulse having the same cycle as the cycle of the output pulse from the first pulse width modulator. A modulating means for outputting a first signal having a predetermined cycle and a duty cycle of 50% to one terminal of the first coil and one terminal of the second coil; From the pulse output from the pulse width modulating means and the signal output from the control signal generating means relating to the direction of energization of the first coil.
And outputs the signal to the other terminal of the first coil, and outputs the first signal, the pulse output from the second pulse width modulation means, and the pulse output from the control signal generation means. Pulse generating means for generating a third signal having a predetermined duty cycle from a signal relating to the direction of current flow to the two coils and outputting the third signal to the other terminal of the second coil; The magnetic field induced in the first coil by the output first signal and the second signal output to the other terminal of the first coil, and the second signal output to one terminal of the second coil The pointer of the vehicle meter is rotated by synthesizing a magnetic field induced in the second coil by the signal of No. 1 and the third signal output to the other terminal of the second coil. In this case, the amount of current supplied to the first coil
Is a sine wave signal corresponding to the swing angle.
And a signal regarding the amount of current supplied to the second coil.
The symbol relates to the amount of current flowing through the first coil.
Of a sine wave having a phase difference corresponding to the swing angle with respect to the signal
It may be a signal. Further, the second signal is the first signal.
Output from the control signal generating means in the same cycle as the signal of
Depending on the value of the signal related to the direction of conduction to the first coil
The logic value is inverted and the phase changes by 180 °
And the third signal has the same circumference as the first signal.
The second coil output from the control signal generating means
The logical value depends on the signal
As a signal that reverses and changes the phase by 180 °
Good.

[0019]

In the control apparatus for electrical equipment for a vehicle according to the present invention, the control signal generating means calculates the swing angle of the pointer of the vehicle meter corresponding to the physical quantity detected by the sensor, and calculates the swing angle of the vehicle meter from the swing angle. A signal related to the amount of current applied to the first coil, a signal related to the amount of current applied to the second coil of the vehicle meter, a signal related to the direction of current to the first coil, and the direction of current to the second coil And a signal related to the output.

The first pulse width modulation means generates and outputs a pulse having a predetermined duty cycle based on a signal output from the control signal generation means and relating to the amount of current supplied to the first coil. The second pulse width modulation means generates and outputs a pulse having a predetermined duty cycle based on a signal relating to the amount of current supplied to the second coil output from the control signal generation means.

Next, based on the pulses output from the first pulse width modulation means and the second pulse width modulation means, a first signal having a frequency of 1/2 of the pulse and a duty cycle of 50% is generated. Generating the first
Output to one terminal of the coil and one terminal of the second coil, and to the first signal, the pulse output from the first pulse width modulation means, and the first coil output from the control signal generation means. A second signal having a predetermined duty cycle based on a signal related to a conduction direction is output to the other terminal of the first coil, and a pulse output from the first signal and the second pulse width modulation unit is output. A third signal having a predetermined duty cycle is output to the other terminal of the second coil based on the control signal generating means and a signal related to an energizing direction to the second coil output from the control signal generating means.

Therefore, a current is supplied to the first coil by the first signal output to one terminal of the first coil and the second signal output to the other terminal of the first coil. Current is supplied to the second coil by the first signal output to one terminal of the second coil and the third signal output to the other terminal of the second coil, The pointer of the vehicle meter is rotated by the combination of the respective magnetic fields induced in the first coil and the second coil, and the pointer of the vehicle meter can be rotated by a digital signal.

[0023]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a control apparatus for controlling electrical components for a vehicle according to the present invention.

FIG. 1 is a block diagram showing the configuration of a first embodiment of a meter drive system 20 for driving an engine tachometer M which is a cross-coil type indicator installed in a vehicle.

The meter drive system 20 includes a microcomputer 22 for outputting a control signal based on the number of revolutions of the engine read from the revolution detection sensor 21, and a predetermined duty cycle based on a signal indicating a current value outputted from the microcomputer 22. Pulse width modulation (hereinafter referred to as PWM) controller 2 that outputs a pulse signal of
4a, 24b, 24c, and 24d, and meter drivers 26a, 26b, and 26 that individually receive outputs of the PWM controllers 24a to 24d and drive the engine rotation system M
c and 26d.

The meter driver 26a includes transistors 30a and 32a as switching elements. Similarly, the meter driver 26b includes transistors 30b and 32b, the meter driver 26c includes transistors 30c and 32c, and the meter driver 26d includes transistors 30d and 32d. Each is composed.

The engine tachometer M has a coil A
And a coil B, and a pointer rotated by a combined magnetic field induced in the coils A and B.

The operation of rotating the pointer of the engine tachometer M by the meter drive system 20 thus configured will be described with reference to FIGS.

When the ignition key is operated and the engine is started, the microcomputer 22 reads the rotation speed of the crankshaft from the rotation detection sensor 21 and
From this rotation speed, the swing angle of the pointer of the engine tachometer M, for example, 135 ° is obtained by calculation.

Next, when the swing angle of the pointer is 135 °, the microcomputer 22 determines the current I
₁ and the direction of current flow to the coil A, for example,
The reverse direction is read from a first look-up table (hereinafter referred to as LUT) provided therein (see FIG. 2A),
Further, the second LU based on the data indicating the current value I ₁
Data related to the duty cycle of the pulse, for example, 30% is read from T (see FIG. 2B), and a signal indicating that the duty cycle is 30% is output to the PWM controller 24a. Pulse of meter driver 2
Output to the A + terminal of the engine tachometer M via 6a.

Further, the microcomputer 22 outputs a signal indicating that the duty cycle is 100% to the PWM controller 24c from the data indicating the reverse of the energization direction read out from the first LUT to the PWM controller 24c. A pulse having a duty cycle of 100% is output to the A- terminal of the engine tachometer M via the meter driver 26c. For this reason,
The coil A has a direction from the A- terminal to the A + terminal, that is,
A current having a duty cycle of 70% is supplied in the reverse direction (see FIG. 3).

Similarly, when the swing angle of the pointer is 135 °, the microcomputer 22 determines the current value I
₂ and the direction of the current flowing through the coil B, for example,
Reading the forward direction from the first LUT shown in FIG. 2A,
Further, based on the data indicating the current value I ₂ , the duty cycle, for example, from the second LUT shown in FIG.
0% is read, and a signal indicating that the duty cycle is 30% is output to the PWM controller 24d.
% Pulse is output to the B- terminal of the engine tachometer M via the meter driver 26d.

Further, the microcomputer 22 outputs a signal indicating that the duty cycle is 100% to the PWM controller 24b from the data indicating the order of the energization direction read from the first LUT to the PWM controller 24b, and the PWM controller 24b responds to this signal. A pulse having a duty cycle of 100% is output to the B + terminal of the engine tachometer M via the meter driver 26b. For this reason,
The coil B has a direction from the B + terminal to the B- terminal, that is,
A current having a duty cycle of 70% is supplied in the forward direction (see FIG. 3).

Therefore, a magnetic field induced in the coil A by a current flowing in the reverse direction at a duty cycle of 70%, and a magnetic field induced in the coil B by a current conducted in the forward direction at a duty cycle of 70%. The pointer of the engine tachometer M is rotated to a position of 135 ° by the combined magnetic field of the above.

Next, a description will be given of a second embodiment for driving the pointer of an engine tachometer M which is a cross-coil type indicator with reference to FIG.

In the following description, the same components as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the figure, reference numeral 33 indicates a meter drive system. Meter drive system 33 is PWM for coil A
A controller 24e, a PWM controller 24f for the coil B, and the PWM controllers 24e and 24e.
a time-division circuit 34 for outputting to the respective terminals of the engine tachometer M a pulse generated from a signal indicating a current value output from the microcomputer f and a signal indicating an energization direction output from the microcomputer 22; A meter driver 26e for the COM terminal connected to the A + and B + terminals of the tachometer M, a meter driver 26f connected to the A− terminal of the engine tachometer M, and a B−
A meter driver 26g connected to the terminal.

The operation of rotating the pointer of the engine tachometer M in the meter drive system 33 configured as described above will be described.

The microcomputer 22 reads the number of rotations of the crankshaft from the rotation detection sensor 21 and, based on the number of rotations, the swing angle θ of the pointer of the engine tachometer M, for example,
Based on θ = 330 °, the current value I ₃ applied to the coil A and the current direction, for example, the forward direction, and the current value I ₄ applied to the coil B and the current direction, for example, are calculated based on θ = 330 °. The reverse direction is read from the first LUT (see FIG. 2A), and the energization direction indication signals for the coils A and B are generated and output to the time division circuit 34.

Next, the microcomputer 22 reads data indicating that the duty cycle is, for example, 80% from the third LUT based on the current value I ₃ applied to the coil A (see FIG. 5), and 80
%, And outputs the signal to the PWM controller 24e.
₄ , the duty cycle from the third LUT is
For example, data indicating 40% is read (see FIG. 5), and a signal indicating a duty cycle of 40% is generated and output to the PWM controller 24f.

The PWM controller 24e generates a pulse PWM-A having a duty cycle of 80% and outputs it to the time division circuit 34. The PWM controller 24f generates a pulse PWM-B having a duty cycle of 40%. , To the time division circuit 34.

The time division circuit 34 is a PWM controller 24
e from the pulse PWM-A output from the PWM controller e and the pulse PWM-B output from the PWM controller 24f, a COM signal having a frequency of 1/2 of these pulses and a duty cycle of 50% is generated. It is supplied to the COM terminal of the engine tachometer M via the driver 26e (see FIG. 6).

Further, the time division circuit 34 outputs the COM signal and the coil A output from the microcomputer 22.
From the energization direction instruction signal (forward direction) and the pulse PWM-A output from the PWM controller 24e.
A signal is generated, and the A-signal is supplied to the A-terminal of the engine tachometer M via the meter driver 26f, and the COM signal and the energization direction instruction signal (reverse signal) of the coil B output from the microcomputer 22 are output. Direction) and
The pulse P output from the PWM controller 24f
A B-signal is generated from the WM-B and the B-signal is supplied to the B-terminal of the engine tachometer M via the meter driver 26g (see FIG. 6).

Therefore, the pulse supplied to the coil A by the pulse supplied to the COM terminal and the pulse supplied to the A- terminal has a duty cycle of 40% based on the period of the pulse supplied to the COM terminal. A current flows in the forward direction, that is, from the COM terminal to the A- terminal, while the coil B receives a pulse supplied to the COM terminal and B-
With the pulse supplied to the terminal, a current having a duty cycle of 20% with respect to the period of the pulse supplied to the COM terminal is conducted in the reverse direction, that is, from the B- terminal to the COM terminal ( (See coil A current and coil B current in FIG. 6).

A magnetic field A is induced by a forward current having a duty cycle of 40% from the COM terminal to the A- terminal, and a reverse current having a duty cycle of 20% from the B- terminal to the COM terminal. Magnetic field B
Is induced, and the pointer of the engine tachometer M is rotated to a position of 330 ° by the combined magnetic field of the magnetic field A and the magnetic field B.

FIG. 7 is a development connection diagram of one embodiment of the time division circuit 34. In this time division circuit 34, the PWM-A
The A-signal and the B-signal generated from the signal, the PWM-B signal, the energization direction instruction signal of the coil A, and the energization direction instruction signal of the coil B are represented by the following general formulas.

When the energization direction instruction signal of the coil A is in the forward direction, the A- terminal

[0048]

(Equation 1)

When the A-signal having the pulse width shown by the following is output and the energization direction instruction signal for the coil A is in the opposite direction,
A- terminal

[0050]

(Equation 2)

An A-signal having a pulse width represented by the following is output.

Similarly, when the energization direction instruction signal of the coil B is in the forward direction, the terminal B-

[0053]

(Equation 3)

When the B- signal having the pulse width shown by the following is output and the energization direction instruction signal for the coil B is in the opposite direction,
The B- terminal has

[0055]

(Equation 4)

A B-signal having a pulse width represented by the following is output.

By the way, for example, new data (hereinafter referred to as changed data) S for driving the pointer of the engine tachometer M is output from the microcomputer 22 to the PWM controller 24e which is outputting the pulse PWM-A. Then, the PWM controller 24e outputs the pulse PWM
Although the pulse PWM-A is being output, the pulse PWM-A being output is changed in order to change the pulse PWM-A to the change data S.
May be added to the pulse width of the changed pulse PWM-A (see FIG. 8).

As a result, the current supplied to the A- terminal of the coil A temporarily increases, and the swing angle of the pointer of the engine tachometer M temporarily increases. There is.

FIG. 9 shows a third embodiment which solves this problem.

In FIG. 9, reference numeral 35 indicates a meter driving system, and reference numeral 36 indicates an OR gate 36.

The input terminal of the OR gate 36 is connected to the output terminal of the PWM controller 24e.
The control input terminal 6 is connected to the output terminal of the PWM controller 24f, and the output terminal of the OR gate 36 is connected to the input terminal of the microcomputer 22.

The microcomputer 22 includes a pulse PWM-A output from the PWM controller 24e and a pulse PWM output from the PWM controller 24f.
-B is read through the OR gate 36, and the output timing of the change data S is determined by the pulse PWM-A or the pulse P
The change data S is generated at a timing at which the cycle of the WM-B signal is newly started, and with a one-cycle operation start signal (not shown) output from the microcomputer 22 to the PWM controller 24e and the PWM controller 24f. Output (see FIG. 10). For this reason, the data can be changed smoothly, and thereby a problem that the swing angle of the pointer of the engine tachometer M temporarily increases can be suppressed.

Even if the output timing of the change data S is output in synchronization with the COM signal output from the time division circuit 34, the problem that the swing angle of the pointer of the engine tachometer M temporarily increases is suppressed. can do. further,
The change data S can be output at an optimum timing even by an interrupt process executed inside the microcomputer 22.

As described above, the first embodiment and the second embodiment
In the third embodiment and the third embodiment, the pointers of the engine tachometer M, which is a cross-coil type indicator, are driven without using the DC amplifier of the analog circuit, without using the PWM controller 24a to 24d or the PWM controller 24e, 2e.
4f and a digital circuit including the time division circuit 34 and the like.

Next, an embodiment of a motor rotation state detection system 38 for detecting the rotation state of the rotation shaft of the brush DC motor 37 mounted on the vehicle by the microcomputer 22 will be described with reference to FIG.

The motor rotation state detection system 38 includes a motor driver 40 for driving the brush DC motor 37 by a signal output from the microcomputer 22.
a and 40b, an A / D converter 42 for converting the voltage of the plus (+) terminal or the minus (-) terminal of the brushed DC motor 37 into a digital value, and a switch for switching the voltage input to the A / D converter 42. And a circuit 44.

Further, a motor rotation state detection system 3
8 includes a meter driving circuit 46 for displaying the voltage of the + terminal or the-terminal of the DC motor 37 with a brush on the meter M1 according to a signal output from the microcomputer 22.

The operation for detecting whether or not the rotating shaft 48 of the brushed DC motor 37 that expands and contracts the radio receiving antenna is normally rotated by the motor rotation state detection system 38 configured as described above will be described. This will be described with reference to FIGS.

The microcomputer 22 starts driving the brush DC motor 37 (step S1), and starts measuring the drive time t of the brush DC motor 37 (step S2).

The driving time t is set to a predetermined time t _M1.
Is determined (step S3), and the drive time t
When the time has reached the time t _M1 , the power supply is stopped (step S
4). Next, after a lapse of a predetermined time t _M2 , the switching circuit 44
To make the C terminal and the + terminal conductive, and the + of the brushed DC motor 37 output from the A / D converter 42
The counter electromotive force generated at the terminal is read (step S5), and further, the switching circuit 44 is energized to make the C terminal and the-terminal of the switching circuit 44 conductive, so that the-
The back electromotive force generated at the terminal is read (step S6).

[0071] The microcomputer 22 has the read + terminal and - from the counter electromotive force generated in the terminal, + terminal and - terminal voltage E ₁ between the terminals determined by the calculation shown in the following equation (step S7), and the terminal voltage E ₁ = (voltage of + terminal) − (voltage of − terminal) (V) (5) It is determined whether or not the terminal voltage E ₁ is higher than a preset reference voltage E ₀ (step S8).

The result of the judgment is that terminal voltage E ₁ > reference voltage E
If it is ₀ (see FIG. 13A), the back electromotive force generated in the brush DC motor 37 when the energization is stopped is sufficient, and the rotating shaft 48 rotates normally. It is determined that it is normal (step S9),
If the terminal voltage E _{1 is} not higher than the reference voltage E ₀ (FIG. 13 (b)
It is determined that the rotating shaft 48 of the brushed DC motor 37 is not rotating normally (step S10).

At this time, the microcomputer 22 outputs a signal indicating the terminal voltage E ₁ to the meter drive circuit 46, and the meter drive circuit 46 drives the pointer of the meter M1.

As described above, the A / D converter 4 can be used without using expensive position sensors and current sensors.
A digital circuit including the switching circuit 2 and the switching circuit 44 can detect whether or not the rotating shaft 48 of the brushed DC motor 37 is rotating normally, and promote the cost reduction of electric components provided in the vehicle. This makes it possible to instruct the meter M1 of the back electromotive force output to the + terminal and the-terminal of the brush DC motor 37 when the current supply to the brush DC motor 37 is stopped.

[0075]

According to the control apparatus for electric components for vehicles according to the present invention, the swing angle of the pointer of the cross-coil type indicator for vehicles can be controlled by a digital signal without using a DC amplifier circuit. In addition, it is possible to easily realize an integrated circuit, and it is possible to promote the cost reduction of electrical components provided in the vehicle.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a meter driving system according to a first embodiment of the present invention.

2A is a diagram showing a relationship between a current direction and a current value with respect to a swing angle of a pointer stored in a first LUT in the meter drive system shown in FIG. 1, and FIG. 2B is a diagram showing a relationship between FIG. In the meter drive system shown, the second LUT
FIG. 4 is a diagram showing a relationship between a current value stored in the memory and a duty cycle.

FIG. 3 shows a voltage supplied to each terminal of a coil A and a coil B in the meter driving system shown in FIG.
4 is a timing chart showing the operation of a current supplied by the voltage.

FIG. 4 is a block diagram showing a configuration of a meter driving system according to a second embodiment of the present invention.

FIG. 5 shows a third example of the meter drive system shown in FIG.
FIG. 6 is a diagram illustrating a relationship between a current value stored in the LUT and a duty cycle.

6 is a timing chart illustrating a relationship between an input signal and an output signal of a time division circuit in the meter driving system shown in FIG.

FIG. 7 is an embodiment of a time division circuit in the meter drive system shown in FIG.

8 is a timing chart illustrating an output time of a pulse that is output when the time division circuit that has input the change data changes the data in the meter drive system illustrated in FIG. 4;

FIG. 9 is a block diagram showing a configuration of a meter driving system according to a third embodiment of the present invention.

FIG. 10 is a timing chart for explaining an output time of a pulse output when a time-sharing circuit that has input change data changes data in the meter drive system illustrated in FIG. 9;

FIG. 11 is a block diagram showing a configuration of a fourth embodiment according to the present invention.

FIG. 12 is a flowchart illustrating an operation of determining the rotation state of the rotating shaft of the DC motor with brush in the fourth embodiment shown in FIG. 11;

FIG. 13 is a diagram illustrating an operation of determining a rotation state of a rotating shaft of a DC motor with a brush in the fourth embodiment shown in FIG. 11;

FIG. 14 is a block diagram of a meter drive system according to a conventional example.

FIG. 15 shows a voltage supplied to each terminal of each coil, a current supplied to each coil, and a swing angle of a pointer of a cross-coil indicating instrument in the conventional meter driving system shown in FIG. 6 is a timing chart for explaining the relationship with the above.

FIG. 16A is a block diagram of a motor rotation state detection system according to a first conventional example, and FIG.
FIG. 6 is a block diagram of a motor rotation state detection system according to a conventional example.

[Explanation of symbols]

 20, 33, 35 ... Meter drive system 22 ... Microcomputer 24a-24f ... PWM controller 26a-26g ... Meter driver 30a-30d, 32a-32d ... Transistor 34 ... Time division circuit 37 ... DC motor with brush 38 ... Rotation of motor State detection system 42 ... A / D converter 44 ... Switching circuit M ... Engine tachometer

Claims (3)

(57) [Claims] A first coil and a second coil arranged crosswise;
A control device for a vehicle electrical component for controlling a swing angle of the pointer of a vehicle meter in which the pointer is rotated by a synthesis of a magnetic field induced in a coil, wherein the pointer of the pointer corresponds to a physical quantity detected by a sensor. The swing angle is calculated, and the first coil is energized from the swing angle.
A signal related to the power supply amount of current, and the signal regarding the power supply amount of current supplied to the second coil, and the signal relating to the energizing direction to the first coil, and generates and outputs a signal relating to the energizing direction to the second coil Control signal generation means, first pulse width modulation means for generating and outputting a duty cycle pulse based on a signal relating to the amount of current supplied to the first coil output from the control signal generation means, and Generating a pulse having a duty cycle based on a signal relating to the amount of current supplied to the second coil and outputted from the control signal generation means, and having the same cycle as the output pulse from the first pulse width modulation means; and pulse width modulation means and a second pulse width modulating means for and outputting, 50% duty cycle with a predetermined period Of the first coil to one terminal of the first coil and the second signal of the second coil.
A signal is output to one terminal of the coil, and a predetermined signal is determined from the first signal, a pulse output from the first pulse width modulation means, and a signal output from the control signal generation means and related to a current flowing direction to the first coil. Generating a second signal having a duty cycle of, and outputting the second signal to the other terminal of the first coil, and generating the control signal and the pulse output from the first signal and the second pulse width modulation means. Pulse generating means for generating a third signal having a predetermined duty cycle from a signal relating to the direction of energization of the second coil output from the means and outputting the third signal to the other terminal of the second coil; The first output to one terminal of the coil
And the second signal output to the other terminal of the first coil.
And the first signal output to one terminal of the second coil and the third signal output to the other terminal of the second coil. A control device for a vehicular electrical component, characterized in that a pointer of a vehicular meter is rotated by synthesizing a magnetic field induced in the second coil. 2. A control device for electrical components for vehicles according to claim 1.
Oite, signal related to the energization amount of current supplied to the first coil
Is a signal of a sine wave corresponding to the swing angle, and is a signal related to the amount of current supplied to the second coil.
Is a signal related to the amount of current supplied to the first coil.
Signal with a phase difference corresponding to the
A control device for electrical components for vehicles, wherein the control device comprises: 3. The control of electrical components for vehicles according to claim 1 or 2.
In the control device, the second signal has the same period as the first signal, and
Energizing the first coil output from the control signal generating means
The logic value is inverted according to the value of the signal related to the direction.
The third signal is a signal whose phase changes by 180 °, and the third signal has the same cycle as the first signal, and
Energizing the second coil output from the control signal generating means
The logic value is inverted according to the value of the signal related to the direction.
It is a signal whose phase changes by 180 °.
Control device for vehicle electrical components.