JP2718503B2 - Control device for vehicle equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to various devices such as an air cleaner for a vehicle, a car stereo, a car radio, and the like, and in particular, a control device suitable for controlling the operation of these devices. About.

(Conventional technology) Conventionally, in this type of control device, Japanese Patent Publication No. 62-4773
As disclosed in Japanese Patent Publication No. 4 (1995), various kinds of noise such as ignition noise superimposed on a power supply line are detected during operation of a vehicle engine. Some motors are connected to a power supply (for example, a battery) and driven, and when the detection level is lower than the reference level, the motor is controlled to be shut off from the power supply and stopped.

(Problems to be Solved by the Invention) However, in such a configuration, since the above-described motor generates noise (hereinafter referred to as motor noise) during its operation, the motor noise is superimposed on the power supply line. I will. Therefore, when the engine is stopped, the motor noise is erroneously detected as the various noises, which may cause a problem that the motor continues to be driven without being cut off from the power supply despite the stop of the engine. As a result, the control of keeping the operation of the air purifier in a stopped state while the engine is stopped is not achieved, which may cause unnecessary power consumption of the power supply.

In order to cope with such a problem, the present invention identifies and detects electric noise generated by the operation of the vehicle engine from noise generated by the motor of the vehicle device, and determines that the driving of the motor is stopped. It is an object of the present invention to provide a control device that performs control so as to surely meet the operation stop.

(Means for Solving the Problems) In solving the problems, a structural feature of the present invention is, as exemplified in FIG. 1, provided with a motor 2a that is rotated by being supplied with power from a power supply 1 and at least an engine. Power supply means 3 for controlling the rotation speed of the motor 2a by supplying the power from the power supply 1 to the motor 2a in the vehicle equipment 2 configured such that the noise of the motor 2a and the noise of the motor 2a are superimposed on the power supply line. A control signal for reducing the power supply amount or stopping the power supply is generated at a time interval and provided to the power supply means 3, and the power supply amount is increased after the time interval. A control signal generating means 4 for generating a control signal for stopping the supply of power and applying the control signal to the power supply means 3; and a control signal generated by the control signal generating means 4 at a time interval. An electrical noise determining means for determining whether or not there is electrical noise generated by the operation of the engine of the vehicle when the power supply means reduces the amount of supplied power or stops the supply of power. When the electrical noise determination means 5 determines that there is no electrical noise, the control signal generation means 4 generates a control signal for stopping the supply of power in response to the determination result, and the power supply means 3 The supply is stopped, and when the electrical noise determining means 5 determines that there is electrical noise, the control signal generating means 4 generates a control signal for increasing the power supply in response to the determination result, That is, the supplying means 3 supplies the electric power by increasing it.

(Operation / Effect) By configuring the present invention as described above, the control signal generating means 4 is controlled in a state where the motor 2a is supplied with power from the power supply 1 by the power supply means 3 and is rotating in the operating state of the engine. Generates a control signal at intervals of time, and in response to this control signal, the power supply means 3 reduces the supply of power from the power supply 1 to the motor 2a or stops the supply of power. When the amount of power supplied to the motor 2a is reduced or the supply of power is stopped, the rotation speed of the motor 2a is reduced or the rotation of the motor 2a is stopped, and motor noise can be reduced.

In such a state, when the electric noise determining means 5 determines that the engine has stopped and the electrical noise generated due to the operation of the engine has disappeared, the control signal generating means 4 responds to the determination result. A control signal for stopping the supply of power is generated, and the power supply unit 3 stops the supply of power from the power supply 1 to the motor 2a to stop the motor 2a.

Therefore, even if the motor noise generated from the motor 2a is mixed into the power supply line connecting the power supply 1 and the motor 2a, in addition to the electric noise generated by the operation of the engine,
As described above, only when the motor noise generated from the motor 2a decreases, the electric noise determination means 5 determines whether there is no electric noise that disappears due to the stop of the engine.

As a result, the motor noise generated from the motor 2a is not erroneously determined as the electric noise, and the stop of the engine can be reliably detected and the motor 2a can be always stopped without fail. Power consumption can be prevented.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIG. 2, reference numeral M denotes a motor built in an air purifier provided on an upper wall in a vehicle cabin. The motor M has one end connected to the positive terminal + Ba of the battery B via the power supply line l, and the other end connected to the collector of the transistor 10 and the transistor M
It is connected to 20 collectors via a resistor 20a. Thus, the motor M is connected to the positive terminal + of the battery B while the transistor 10 is conducting while the transistor 20 is not conducting.
A DC voltage Va is applied from Ba through a power supply line l to rotate. In such a case, the rotating motor of the motor M is a DC voltage.
It is fast corresponding to Va. Further, the motor M rotates with the DC voltage Va applied from the positive terminal + Ba of the battery B via the power supply line 1 and the resistor 20a while the transistor 20 is conducting while the transistor 10 is not conducting. In such a case, the rotation motor of the motor M is connected to the DC voltage Va−the resistance 20
It is slow corresponding to the voltage drop due to a. The transistors 10 and 20 and the resistor 20a constitute the power supply unit 3.

Next, a circuit configuration for controlling both the transistors 10 and 20 will be described.The normally open self-recovering main operation switch 30a is closed when the air purifier is started or stopped to generate a main operation signal. . On the other hand, the normally-open self-returning type sub-operation switch 30b is closed when the motor M is set to the low-speed mode or the high-speed mode, and generates a sub-operation signal.

The constant voltage circuit 40 receives the DC voltage Va from the positive terminal + Ba of the battery B and generates a constant voltage. Reference voltage generator 50
Receives a constant voltage from the constant voltage circuit 40 and generates a reference voltage Vr. In such a case, the reference voltage Vr corresponds to the minimum level of electric noise (corresponding to ignition noise, alternator noise, regulator noise, etc.) on the power supply line 1 in the operating state of the engine of the vehicle.

The waveform shaper 60 receives the DC voltage Va from the positive terminal + Ba of the battery B through the power supply line l together with the electric noise on the power supply line l, cuts off the DC component, extracts only the electric noise, and extracts the noise signal Vd Occurs.

The comparison circuit 70 compares the noise signal Vd from the waveform shaper 60 with the reference voltage Vr from the reference voltage generator 50, and
When the level of Vd is higher than the reference voltage Vr, a high-level comparison signal is generated. The level of the noise signal Vd is equal to the reference voltage.
When the voltage is lower than Vr, a low-level comparison signal is generated.

The microcomputer 80 executes the computer program in cooperation with the main operation switch 30a, the sub operation switch 30b, and the comparison circuit 70 according to the flowcharts shown in FIGS. 3 and 4, and during this execution,
The arithmetic processing necessary for controlling both transistors 10 and 20 is performed.
However, the above-described computer program is stored in the ROM of the microcomputer 80 in advance. The microcomputer 80 operates by receiving a constant voltage from the constant voltage circuit 40.

It should be noted that the above-described reference voltage generator 50, waveform shaper 60, comparison circuit 70, and step 166 of the computer program stored in the microcomputer 80 in advance constitute the electric noise determination means 5. Also, steps 161 to 163 of the computer program stored in advance in the microcomputer 80,
Steps 167 and 168 are the control signal generating means 4.

In the present embodiment configured as described above, the constant voltage circuit
40 constantly receives a DC voltage Va from the battery B and generates a constant voltage, and a reference voltage generator 50 generates a reference voltage Vr. In such a case, since the engine is not operating, no electrical noise is generated and the noise signal Vd from the waveform shaper 60 has disappeared, so that the comparison circuit 70 generates a comparison signal at a low level.
Also, the microcomputer 80 operates in response to the constant voltage from the constant voltage circuit 40, and starts executing the computer program in step 100 according to the flowchart of FIG. 3, and initializes the computer program in step 100a to execute the computer program. Proceed to step 110 and subsequent steps.

That is, the microcomputer 80 resets its built-in timer in step 110 to start time measurement, and inputs a comparison signal from the comparison circuit 70 in step 100a. Thereafter, when the counted value t of the timer reaches the predetermined time Ta, the microcomputer 80 determines in step 120 that “Y
ES ”, and in step 130,“ YES ”is determined based on the low level of the comparison signal in step 110a.

In such a state, if the engine is started by closing an ignition switch of the vehicle, electric noise generated during operation of the engine is generated on the power supply line l in a state of being superimposed on the DC voltage Va from the battery B. (See reference numeral A1 in FIG. 5). Therefore, the waveform shaper 60 generates the noise signal Vd, and the comparison circuit 70 generates a high-level comparison signal based on the level of the noise signal Vd> the reference voltage Vr from the reference voltage generator 50. When the main operation switch 30a generates a main operation signal (see reference numeral B1 in FIG. 5), the microcomputer 80 resets and starts the timer when the computer program reaches step 110, and proceeds to step 110a. Then, a high-level comparison signal is input from the comparison circuit 70, and when the timer value t ≧ Ta is satisfied, “YES” is determined in the step 120, and in the step 130, the high-level comparison signal in the step 110a is set. Based on "N
O ". In step 140, "YES" is determined if the main operation signal from the main operation switch 30a has been generated.

In the next step 150, the motor M is set to the high-speed mode (Hi).
It is determined whether to drive in the low speed mode (Lo). Here, when the drive is restarted in the same mode as when the previous drive was stopped, and a sub-operation signal is generated from the sub-operation switch 30b, the drive mode is switched to “HI” or “L”.
o ". Then, at step 150, "H
i ", the microcomputer 80
At step 150a, a high-speed output signal for rotating the motor M at a high speed is generated. In response to this, the transistor 10 is turned on, and the motor M receives the DC voltage Va from the battery B and starts rotating in the high-speed mode ( In FIG. 5, reference numeral C1).

At this time, noise (hereinafter, referred to as motor noise) generated from the motor M comes to the power line l together with the electric noise. After the processing in step 150a, the microcomputer 80 starts executing the motor control calculation routine 160 (see FIGS. 3 and 4) in step 160a, and in step 161 resets and starts the timer to start time measurement. .

Thus, while the determination of “NO” is repeated in step 162, the timer count value t is equal to the period To and the measurement time Tb.
When the difference is equal to or greater than the difference (To−Tb), the microcomputer 80 determines “YES” in step 162. This means that after the branching process to “Hi” in step 150 (see reference numeral C1 in FIG. 5), the time has elapsed by (To−Tb). However, the period To and the measurement time Tb are respectively set to values suitable for detecting the electric noise from the motor noise from the motor M without causing unnecessary power consumption of the battery B. The period To and the measurement time Tb are stored in the ROM of the microcomputer 80 in advance.

After determining "YES" in step 162 as described above, the microcomputer 80 turns off the high-speed output signal and turns off the transistor 10 in step 163. As a result, the motor M is cut off from the DC voltage Va from the battery B and stops (see the reference numeral C2 in FIG. 5). Next, the microcomputer 80 receives the comparison signal generated by the comparison circuit 70 in step 164, and
, Is determined to be “NO” based on t <To. Hereafter, t <To
Is established, the cyclic operation of each of the steps 163, 164 and 165 is repeated.

Thereafter, when the determination in step 165 is “YES”, the microcomputer 80 performs the determination in step 166 based on the latest comparison signal level in step 164. In such a case, since the motor M is stopped and no motor noise is generated, and electric noise is generated due to operation of the engine, only the electric noise is applied to the DC voltage Va from the battery B on the power supply line l. Are superimposed. Therefore, at this stage, the comparison signal generated from the comparison circuit 70 maintains the high level only due to the electric noise. As a result, the microcomputer
In step 166, the determination at step 166 is “YES” solely due to the electric noise without being affected by the motor noise. This means that the operating state of the engine has been reliably identified and detected from the motor noise.

Then, the microcomputer 80 returns the high-speed output signal again in step 167, turns on the transistor 10, and rotates the motor M again in the high-speed mode in the same manner as described above (see reference numeral C3 in FIG. 5). . Then, in step 170 (see FIG. 3), the microcomputer 80 sets “N” based on the latest high level in step 164.
O, and at step 180, the main operation switch 30
"YES" is determined based on the main operation signal generated from a. Next, after the same operation as described above is repeated and the cycle To is repeated again, the sub-operation switch 30b generates a sub-operation signal (see reference numeral D1 in FIG. 5). Fifteen
Upon reaching 0, the process branches to "Lo", and in step 150b, the high-speed output signal is extinguished and a low-speed output signal for setting the motor M to the low-speed mode is generated. For this reason, the transistor 20 conducts under the non-conduction of the transistor 10, and the motor M rotates in the low-speed mode (see reference numeral C4 in FIG. 5).

Thereafter, when the processing shifts to the execution of the motor control calculation routine 160, the microcomputer 80
The calculation in 162 is performed in the same manner as described above, and after determining “YES” in step 162, in step 163, the low-speed output signal is extinguished and the transistor 20 is turned off. As a result, the motor M is cut off from the DC voltage Va from the battery B and stops (see reference numeral C5 in FIG. 5). Next, the microcomputer 80 determines in step 164 that the comparison circuit 7
The comparison signal resulting from 0 is input, and at step 165, t
<No is determined based on To. Thereafter, while t <To is satisfied, the cyclic operation of each of the steps 163, 164 and 165 is repeated.

Thus, when the determination in step 165 is “YES”, the microcomputer 80 in step 166 returns “YES” based on the high level of the comparison signal from the comparison circuit 70 while the motor M is stopped as described above. Determine. This means that even when the motor M is stopped from the low speed mode,
This means that the operating state of the engine is reliably identified and detected from the motor noise. Then, the microcomputer 80 generates a low-speed output signal again in step 167, and rotates the motor M again in the low-speed mode (see reference numeral C6 in FIG. 5). Then, the microcomputer 80
Is determined to be “NO” in the same manner as described above in Step 170,
At step 180, “YES” is determined based on the main operation signal generated from main operation switch 30a.

In this state, when a sub-operation signal (see reference numeral D2 in FIG. 5) is again generated from the sub-operation switch 30b, the microcomputer 80 branches to “Hi” in step 150, and performs high-speed processing in step 150a. The motor M is set to the high-speed mode by the generation of the output signal (see reference numeral C7 in FIG. 5). Next, the microcomputer 80 performs each step.
After the same operation as described above in 161,162, each step 1631,1
Based on the cyclic operation in 64 and 165, the comparison signal is input from the comparison circuit 70 while the motor M is stopped due to the disappearance of the high-speed output signal. Thus, the determination in step 165 is "Y
If the electric noise has already disappeared due to the stoppage of the engine at the time of "ES", the motor M does not generate any motor noise due to the stoppage of the motor, so that there is no noise on the power supply line 1 ( (See reference numeral A3 in FIG. 5). Therefore, the level of the comparison signal input in step 164 is low based on the disappearance of the noise signal from the waveform shaper 60.

For this reason, the microcomputer 80 determines “NO” in the next step 166, and stops the motor M while maintaining the disappearance of the high-speed output signal in the step 168 in the same manner as in the step 163. Secure (C8 in Fig. 5)
refer. In other words, when the engine is stopped, the stop of the engine is determined based on the disappearance of the electric noise in a state where the motor noise disappears while the motor M is stopped. Is not mistakenly determined as the electric noise, and when the engine is stopped, the stop of the motor M is always ensured with good timing. Power consumption can be prevented.

In the above operation, the case where the engine is stopped in the high-speed mode of the motor M has been described. Alternatively, even when the engine is stopped in the low-speed mode of the motor M, the low-speed output signal in each of the steps 163 and 168 Can achieve substantially the same effect.
If “YES” is determined in step 170 or “NO” is determined in step 180, the high-speed output signal or the low-speed output signal is extinguished in step 180a. .

In implementing the present invention, even if the motor M is not completely stopped in step 163 due to the disappearance of the high-speed output signal or the low-speed output signal, the electric noise accompanying the operation of the engine is reduced by the motor noise from the motor M. The motor M may be decelerated to reduce the motor noise to such an extent that the motor noise can be reliably identified.

Further, in implementing the present invention, the motor control calculation routine 160 is stored in advance in the ROM of the microcomputer 80 in order to specify the motor control calculation routine 160 from the flowchart of FIG. 4 partially modified as shown in FIG. May be implemented. In this case, the predetermined number No in step 162a is, for example, 3 and is stored in the ROM of the microcomputer 80 in advance.

Thus, in this modified example, after the main operation signal is generated from the main operation switch 30a (see reference numeral B1 in FIGS. 5 and 7) as in the above-described embodiment, the computer program executes steps 150a and 162. When the process proceeds to step 162a, each of the steps 162a, 162b, 162c, 162d, 162d, 162d,
In the process of repeating the operation passing through 169, 169a, and 166, the low-speed output signal is generated for each To (each code C9, C9 in FIG. 7).
10), the input of the comparison signal from the comparison circuit 70 under the generation of each low-speed output signal, and the addition and updating of the count data N are performed. If N ≧ No holds, each step 162a, 163, 164, 16
In the operation process passing through 5, 165a and 166, the low-speed output signal after To is extinguished (see reference numeral C11 in FIG. 7), the comparison signal is input, and N = 0 is set.

Therefore, if N <No, step 166 is performed based on the level of the comparison signal under the low speed mode of the motor M based on the level of the low speed output signal from the microcomputer 80.
Is determined. For this reason, in a state where the change in the rotation speed of the motor M is limited between the high-speed mode and the low-speed mode, the presence or absence of the electric noise due to the operation of the engine is determined. It is possible to identify the presence of electrical noise while minimizing the generation of noise such as a growling sound.

If N ≧ No, the determination in step 166 is made based on the level of the comparison signal while the motor M is stopped based on the disappearance of the low-speed output signal from the microcomputer. For this reason, the presence or absence of the electric noise is determined in a state where the motor noise from the motor M is eliminated.
Only the electric noise can be surely separated and identified from the motor noise. Therefore, the stop of the motor M accompanying the disappearance of the electric noise (see reference numeral A3 in FIG. 7) can be reliably realized with good responsiveness (see reference numeral C12 in FIG. 7).

When the motor M returns to the high-speed mode after stopping (see reference numeral C11 in FIG. 7), the rotation speed of the motor M greatly changes.
There is no particular problem because it is only the times.

Also, as in the above-described embodiment, steps 150b to
When the operation shifts to the operation to 162, the steps 162a and 162
b, 163, 164, 165, 165a, and 166, the low-speed output signal disappears in each cycle To in the calculation process (reference C1 in FIG. 7).
3) Refer to C14) and input the comparison signal. Therefore, the level of the comparison signal is determined in step 166 under the elimination of the motor noise due to the stoppage of the motor M in substantially the same manner as described above, so that the electric noise can be reliably separated from the motor noise and identified. In such a case, since the motor M only involves a change in the rotational speed between the low-speed motor and the stopped state, noise such as a growling noise can be suppressed to a minimum.

Further, in practicing the present invention, the same effects and advantages as those of the above-described embodiment are achieved even if the present invention is applied to various types of vehicle equipment having a built-in motor such as a car radio, a car stereo, etc. it can.

[Brief description of the drawings]

FIG. 1 is a corresponding diagram corresponding to the configuration of the invention described in the claims, FIG. 2 is a block diagram showing one embodiment of the present invention,
3 and 4 are flow charts showing the operation of the microcomputer of FIG. 2, FIG. 5 is a time chart for explaining the operation state of the motor of FIG. 2, and FIG. 6 is a flow chart of FIG. FIG. 7 is a main part flowchart showing a modification, and FIG. 7 is a time chart for explaining the operation state of the motor in the modification. Description of symbols B: Battery, M: Motor, 10, 20 ... Transistor, 20a: Resistance, 50: Reference voltage generator, 60: Waveform shaper, 70: Comparison circuit, 80: Micro Computer.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Zaizen Rei 2-1-1 1-1 Showa-cho, Kariya-shi, Aichi Japan Inside Denso Co., Ltd. (72) Yuichi Kajino 1-1-1-1 Showa-cho, Kariya-shi, Aichi Japan Inside Electric Equipment Co., Ltd. (72) Inventor Tomoyuki Miyagawa 1-1-1, Showa-cho, Kariya City, Aichi Prefecture Japan Electric Equipment Co., Ltd. (72) Inventor Masahiko Sugaya 1-1-1, Showa-cho, Kariya City, Aichi Prefecture Japan Electric Equipment Co., Ltd. (72 ) Inventor Tomomi Iwata 1-1-1, Showa-cho, Kariya-shi, Aichi, Japan Inside Denso Co., Ltd. (72) Inventor Tetsuya Ikeda 3, 3, Iyama, Shinome-machi, Anjo-shi, Aichi Prefecture Inside Anjo Electric Machinery Co., Ltd. No. 3 Iyama, Shinome-cho, Anjo-shi, Aichi Pref. Anjo Denki Co., Ltd. (56) Reference: Japanese Utility Model Application Sho 57-122440 (JP, U) P, B2)

Claims (1)

(57) [Claims] 1. A vehicle device comprising a motor which is rotated by being supplied with power from a power supply, wherein at least engine noise and motor noise are superimposed on a power supply line, wherein the power from the power supply is supplied to the motor. Power supply means for controlling the rotation speed of the motor by supplying the power supply means with a control signal for reducing the supply amount of the power or stopping the supply of the power at time intervals. Control signal generating means for applying to the power supply means a control signal for increasing the power supply amount or stopping the power supply after the time interval, and applying the control signal to the power supply means. The power supply means reduces the supply amount of the power or the power supply in response to a control signal generated by the signal generation means at a time interval. When stopping the supply,
Electrical noise determining means for determining the presence or absence of electrical noise generated due to the operation of the engine of the vehicle. If the electrical noise determining means determines that there is no electrical noise, the control signal generation is performed in response to the determination result. Means for generating a control signal for stopping the supply of the power, causing the power supply means to stop the supply of the power, and determining the presence of the electrical noise by the electrical noise determination means. In response to a result, the control signal generating means generates a control signal for increasing the power supply, and the power supply means increases and supplies the power. Control device for equipment.