JP2014054146A - Power supply controller for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply controller for vehicle, achieving the maximum reduction effect of power consumption by PWM control without causing significant duty ratio fluctuations or oscillation phenomena and performing switching operations between DC driving and PWM driving of a load at such timing that a user does not feel the switching operations.SOLUTION: The power supply controller for vehicle includes arithmetic processing means 4 that performs arithmetic processing for voltage values of on-vehicle power supplies 1, B detected at a predetermined sampling period and outputs a voltage value with a fluctuation speed reduced and PWM-controls the voltages of on-vehicle power supplies 1, B to a predetermined voltage value on the basis of a voltage value output by the arithmetic processing means 4 and transmits the voltage value to loads 13-15, and further includes means 7-9 for detecting power values consumed by the loads 13-15 and means 4 for changing fluctuation speeds of voltage values to be high or low according to the magnitude of the detected voltage values, and PWM-controls voltages of the on-vehicle power supplies 1, B on the basis of the voltage values output by arithmetic processing of the arithmetic processing means 4.

Description

  The present invention is provided with arithmetic processing means for performing an arithmetic processing for reducing the fluctuation speed on the voltage value of the in-vehicle power supply detected at a predetermined sampling period, and outputting the in-vehicle power supply based on the power supply voltage value output by the arithmetic processing means. The present invention relates to a vehicle power supply control device that performs PWM (Pulse Width Modulation) control of a power supply voltage to a predetermined voltage value and applies a PWM-controlled voltage to a load.

Many devices (loads) mounted on a vehicle have a rating of around 12V, and the performance is optimally exhibited around 12V. However, since the output voltage value of the in-vehicle battery varies depending on the amount of electricity stored, the output voltage value is higher than around 12V when the amount of electricity stored is relatively large. In addition, the output voltage value of the alternator (on-vehicle generator) is set to more (13 to 16 V) in order to charge the on-vehicle battery.
Therefore, recently, from the viewpoints of energy saving (power saving) and prevention of shortening the life of equipment, a vehicle power supply control device for supplying power to equipment by PWM control of the power supply voltage from the in-vehicle battery and the alternator to around 12 V has become widespread. It's getting on.

  In such a vehicle power supply control device, detection and A / D (analog / digital) conversion are performed so that a sensitive duty ratio variation and oscillation phenomenon do not occur due to vehicle-specific power supply voltage fluctuation, voltage fluctuation due to PWM frequency, and the like. A digital filter process is applied to the measured voltage value. As the digital filter, an IIR (infinite impulse response) filter, an FIR (finite impulse response) filter, or the like is used.

  Japanese Patent Application Laid-Open No. 2004-228688 includes a voltage detection unit that detects an output voltage value of a battery, and uses a duty ratio based on the output voltage value detected by the voltage detection unit to perform PWM control of power supplied to the load by the battery. An apparatus is disclosed. The voltage detection means periodically detects the output voltage value of the battery, and an IIR with a circuit constant determined so as to suppress a pulsation component having a frequency of 20 Hz or more included in the output voltage value of the battery to 1 / √2 or less. An (Infinite Impulse Response) filter is provided, and the duty ratio is determined based on the output voltage value filtered by the IIR filter.

  Patent Document 2 discloses a PWM that generates a pulse signal whose duty cycle changes in response to rising / falling of a timing signal for turning on / off, imitating rising / falling of light emission in turning on / off of a filament. A lighting / extinguishing control device having a signal generation unit and a light emission control unit that controls the light emission unit in response to a pulse signal of the PWM signal generation unit is disclosed. This lighting / extinguishing control device also has a storage unit for storing a control data table for duty cycle control by the PWM signal generation unit.

  The control data table includes a rise table that is referred to at the rise of light emission and a fall table that is referred to at the fall of light emission. The rise table and the fall table are respectively the rise / rise of the timing signal. The elapsed time from the fall is associated with the duty cycle of the pulse signal. Further, the relationship between the two tables cannot be superimposed on each other.

JP 2010-172176 A WO2009 / 019945

Since the above-described vehicle power supply control device uses a digital filter, there is a problem that a response delay occurs in PWM control due to the time constant of the digital filter when the power supply voltage fluctuates.
For example, as shown in FIGS. 12 and 13, when the power supply voltage rises (3 V / sec in FIG. 12), the voltage after applying the digital filter is delayed in the rise, and as a result, the start of the PWM control is delayed. The effective voltage subjected to delay and PWM control temporarily exceeds the target voltage (12.5 V in FIG. 12) of PWM control. Thereby, although the reduction effect (power saving effect) of power consumption becomes small, the performance of load becomes high.

In addition, as shown in FIGS. 12 and 13, when the power supply voltage drops during execution of PWM control (10 V / sec in FIG. 12), the voltage after applying the digital filter is delayed in falling, As a result, the stop of the PWM control is delayed, and the effective voltage subjected to the PWM control for that reason temporarily falls below the target voltage of the PWM control. Thereby, although the reduction effect (power saving effect) of power consumption becomes large, the performance of load becomes low.
Accordingly, a delay in PWM control response caused by the time constant of the digital filter causes a delay in switching between the DC drive and PWM drive of the load, and the effect of reducing power consumption becomes unstable, and the DC drive and PWM drive of the load become unstable. The problem is that the switching is perceived by the user.

  The present invention has been made in view of the above-described circumstances, and PWM control does not cause sensitive duty ratio fluctuations and oscillation phenomena, and the effect of reducing power consumption is maximized. It is an object of the present invention to provide a vehicular power supply control device that can perform drive switching at a timing that is not perceived by a user.

  The power supply control device for a vehicle according to the first aspect includes arithmetic processing means for performing arithmetic processing on the voltage value of the in-vehicle power source detected at a predetermined sampling period and outputting a voltage value with reduced fluctuation speed of the voltage value, Based on the voltage value output by the arithmetic processing means, the vehicle power supply voltage is PWM controlled to a predetermined voltage value, and the power value consumed by the load is detected in a vehicle power supply control device that applies the PWM controlled voltage to the load. And means for changing the fluctuation speed so as to increase / decrease according to the magnitude of the power value detected by the means, and the arithmetic processing means uses the fluctuation speed changed by the means. The configuration is such that the voltage of the in-vehicle power supply is PWM-controlled based on a voltage value that has been subjected to arithmetic processing and output.

In this vehicle power supply control device, the arithmetic processing means performs arithmetic processing on the voltage value of the in-vehicle power source detected at a predetermined sampling period, and outputs a voltage value with reduced fluctuation speed of the voltage value. Based on the output voltage value, the voltage of the in-vehicle power supply is PWM controlled to a predetermined voltage value, and the PWM controlled voltage is applied to the load.
The means for detecting detects the power value consumed by the load, and the means for changing changes so as to increase / decrease the fluctuation speed according to the magnitude of the detected power value. Based on the voltage value output by the arithmetic processing means performing arithmetic processing according to the changed fluctuation speed, the voltage of the in-vehicle power source is PWM-controlled.

  The vehicle power supply control device according to the second invention is based on the voltage value of the in-vehicle power supply detected at a predetermined sampling period, (1-α) × (voltage value output one period before) + α × (detected voltage value) ) = Calculating a voltage value (where α is a coefficient 1 ≧ α> 0) and outputting the calculated voltage value, and based on the power supply voltage value output by the calculation processing means, In a vehicle power supply control device that applies a PWM control to a predetermined voltage value and supplies the load to a load, a power detection means for detecting a power value consumed by the load, and a power value to be detected by the power detection means Storage means for storing a coefficient α determined to be large / small according to the power, and means for reading the coefficient α corresponding to the power value detected by the power detection means from the storage means. According to the coefficient α, the arithmetic processing means Characterized in that is arranged to the calculated output.

In this vehicle power supply control device, the arithmetic processing means, based on the voltage value of the in-vehicle power supply detected at a predetermined sampling cycle, (1-α) × (voltage value output one cycle before) + α × (detected voltage Value) = voltage value (where α is a coefficient of 1 ≧ α> 0), and the calculated voltage value is output. Based on the power supply voltage value output by the arithmetic processing means, the voltage of the in-vehicle power supply is PWM controlled to a predetermined voltage value and applied to the load.
The power detection means detects the power value consumed by the load, and the storage means stores a coefficient α determined to be large / small according to the magnitude of the power value to be detected by the power detection means. The reading means reads the coefficient α corresponding to the power value detected by the power detection means from the storage means, and the arithmetic processing means calculates and outputs the power supply voltage value based on the read coefficient α.

  The vehicle power supply control device according to the third invention is based on the voltage value of the in-vehicle power supply detected at a predetermined sampling period, (1-α) × V + α × (detected voltage value) = voltage value (where α is 1). A coefficient of ≧ α> 0) and a calculation processing means for outputting the calculated voltage value, and based on the voltage value output by the calculation processing means, the voltage of the in-vehicle power supply is PWM controlled to a predetermined voltage value. In the vehicle power supply control device applied to the load, the power detection means for detecting the power consumption value consumed by the load, and the high / low is determined according to the power consumption value to be detected by the power detection means. Storage means for storing the measured voltage value, and means for reading the voltage value corresponding to the power consumption value detected by the power detection means from the storage means, and the voltage value read by the means is converted into the calculation process. The means calculates and outputs the voltage value as V It characterized that you have urchin configuration.

In this vehicle power supply control device, the arithmetic processing means is (1−α) × V + α × (detected voltage value) = voltage value (provided that α is based on the voltage value of the in-vehicle power supply detected at a predetermined sampling period. (Coefficient of 1 ≧ α> 0) and the calculated voltage value is output. Based on the voltage value output by the arithmetic processing means, the voltage of the in-vehicle power source is PWM controlled to a predetermined voltage value and applied to the load.
The power detection means detects a power consumption value consumed by the load, and the storage means stores a voltage value determined as high / low according to the power consumption value to be detected by the power detection means. Yes. The reading means reads the voltage value corresponding to the power consumption value detected by the power detection means from the storage means, and the arithmetic processing means calculates the voltage value with V as the read voltage value and outputs it.

  A power supply control device for a vehicle according to a fourth aspect of the present invention comprises arithmetic processing means for performing arithmetic processing on the voltage value of the in-vehicle power source detected at a predetermined sampling cycle and outputting a voltage value with reduced fluctuation speed of the voltage value, Based on the voltage value output by the arithmetic processing means, the vehicle power supply voltage is PWM controlled to a predetermined voltage value, and the power value consumed by the load is detected in a vehicle power supply control device that applies the PWM controlled voltage to the load. Power detecting means, storage means for storing a sampling period determined to be short / long according to the magnitude of the power value to be detected by the power detecting means, and the power value detected by the power detecting means Means for reading from the storage means the sampling period corresponding to the above-mentioned means, and the arithmetic processing means performs arithmetic processing on the voltage value of the in-vehicle power supply detected in the sampling period read by the means Characterized in that are configured.

In this vehicle power supply control device, the arithmetic processing means performs arithmetic processing on the voltage value of the in-vehicle power supply detected at a predetermined sampling period, and outputs a voltage value with reduced voltage value fluctuation speed. Based on the voltage value output by the arithmetic processing means, the voltage of the in-vehicle power source is PWM controlled to a predetermined voltage value, and the PWM controlled voltage is applied to the load.
The power detection means detects a power value consumed by the load, and the storage means stores a sampling period set to short / long according to the magnitude of the power value to be detected by the power detection means. The reading means reads the sampling period corresponding to the power value detected by the power detection means from the storage means, and the arithmetic processing means performs arithmetic processing on the voltage value of the in-vehicle power supply detected in the read sampling period.

  According to the vehicle power supply control device according to the present invention, the PWM control does not cause a sensitive duty ratio fluctuation and oscillation phenomenon, the effect of reducing power consumption is maximized, and switching between load DC drive and PWM drive is performed. A vehicle power supply control device that can be executed at a timing that is not perceived by the user can be realized.

1 is a block diagram showing a schematic configuration of an embodiment of a vehicle power supply control device according to the present invention. It is a flowchart which shows operation | movement of embodiment of the vehicle power supply control apparatus which concerns on this invention. It is a flowchart which shows operation | movement of embodiment of the vehicle power supply control apparatus which concerns on this invention. It is a wave form diagram which shows the example of the voltage value which the filter calculating means performed and performed the filter calculation process, when the voltage of the positive terminal of a battery rose. It is a wave form diagram which shows the example of the voltage value which the filter calculating means performed and performed the filter calculation process, when the voltage of the positive terminal of a battery rose. 1 is a block diagram showing a schematic configuration of an embodiment of a vehicle power supply control device according to the present invention. It is a flowchart which shows operation | movement of embodiment of the vehicle power supply control apparatus which concerns on this invention. It is a wave form diagram which shows the example of the voltage value which the filter calculating means performed and performed the filter calculation process, when the voltage of the positive terminal of a battery rose. 1 is a block diagram showing a schematic configuration of an embodiment of a vehicle power supply control device according to the present invention. It is a flowchart which shows operation | movement of embodiment of the vehicle power supply control apparatus which concerns on this invention. It is a wave form diagram which shows the example of the voltage value which the filter calculating means performed and performed the filter calculation process, when the voltage of the positive terminal of a battery rose. It is a wave form diagram which shows the example of the voltage value which the conventional filter calculating means performed the filter calculation process and output, when the voltage of the plus terminal of a battery rose. It is a wave form diagram which shows the example of the voltage value which the conventional filter calculating means performed the filter calculation process and output, when the voltage of the plus terminal of a battery rose.

Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments thereof.
(Embodiment 1)
FIG. 1 is a block diagram showing a schematic configuration of a first embodiment of a vehicle power supply control device according to the present invention.
In this vehicle power supply control device, electric power generated and rectified by an alternator (on-vehicle generator, AC generator) 1 is charged to a battery B, and a load which is a lamp through each switching circuit 10, 11, 12. Power is supplied to 13,14,15. When the battery B is not charged, the discharged power from the battery B is supplied to the loads 13, 14, and 15 through the switching circuits 10, 11, and 12.

  The power supply voltage values output from the alternator 1 and the battery B are detected by the voltage measuring means 3 through the power supply input circuit (filter) 2, A / D converted, and output. The power supply voltage value A / D converted by the voltage measuring means 3 and output is read by the filter calculating means (calculating processing means) 4 for each of the loads 13, 14, 15 at a predetermined sampling period. It is assumed that the sampling cycle read by the filter calculation unit 4 is set to be the same as the sampling cycle in which the voltage measurement unit 3 performs A / D conversion.

The filter calculation means 4 performs digital filter processing on the read power supply voltage value with an IIR filter. This digital filter processing is performed by calculating equation (1) for each of the loads 13, 14, and 15.
(1-α) × (Voltage value output one cycle before)
+ Α × (detected voltage value) = voltage value (where 1 ≧ α> 0) (1)

For each of the loads 13, 14, and 15, the power supply voltage value that has been subjected to digital filter processing according to the equation (1) is given to the duty ratio calculation means 5. The duty ratio calculation means 5 uses the given power supply voltage value and predetermined voltage value (here, 13.2 V), and uses the expression (2) (13.2 / power supply voltage value) ² × 100 (% (2)
Thus, the duty ratio is calculated and given to the duty ratio output means 6.

The duty ratio output means 6 performs PWM control of the switching circuits 10, 11, and 12 according to the given duty ratio, and the power supply voltage subjected to PWM control is supplied to the loads 13, 14, and 15, respectively. In the switching circuits 10, 11, and 12, when DC power is applied to the loads 13, 14, and 15 and PWM control is not performed, the power source-loads 13, 14, and 15 are maintained in an on (connected) state.
The output monitoring circuit (power detection means) 7 converts the voltage value and current value (effective value) of power PWM-controlled by the switching circuits 10, 11, and 12 into voltage values, respectively, and voltage / current measurement means (power detection) Means).

The voltage / current measuring means 8 performs A / D conversion on the voltage value and the current value which are given after being converted into voltage values, and gives them to a W (watt) number calculation means (power detection means) 9.
The W number calculation means 9 multiplies the voltage value and the current value supplied to the given loads 13, 14, and 15 to calculate the power consumption values of the loads 13, 14, and 15, respectively. The power consumption value is given to the filter calculation means 4.

The filter calculation means 4 has a built-in table (storage means) 4a that stores the coefficient α (smoothing coefficient) of the filter calculation means 4 corresponding to the power consumption values to be detected by the loads 13, 14, and 15. doing. The coefficient α is determined to be large / small according to the large / small power consumption value.
The coefficient α corresponds to each power consumption value of the loads 13, 14, 15, and the maximum reduction effect (power saving effect) of the assumed power consumption is obtained, and the DC drive and PWM drive of the loads 13, 14, 15 are obtained. It is determined on the basis of actual measurement or calculation so that the switching can be executed at a timing at which the user does not sense (no flicker or the like).

In the table 4a, for example, the coefficient α corresponding to the power consumption value W corresponds to ND corresponding to W ≧ WC, NC corresponding to WC> W ≧ WB, NB corresponding to WB> W ≧ WA, and WA> W. (Where WC>WB> WA, ND>NC>NB> NA).
The filter calculating means (reading means) 4 reads the coefficient α corresponding to each power consumption value of the given loads 13, 14, 15 from the table 4a, and calculates the expression (1) for each of the loads 13, 14, 15 To do. The power supply voltage value for each of the loads 13, 14, 15 calculated by the expression (1) is given to the duty ratio calculation means 5.

  The voltage measuring means 3, the filter calculating means 4, the duty ratio calculating means 5, the duty ratio output means 6, the voltage / current measuring means 8 and the W number calculating means 9 described above are constituted by a power supply control unit 22 provided with a microcomputer. The power supply control unit 22 is given a start / stop signal for each of the loads 13, 14 and 15 from the vehicle side.

The operation of the vehicular power supply control apparatus having such a configuration will be described below with reference to the flowcharts of FIGS. In this vehicle power supply control device, the loads 13, 14, and 15 are operated in parallel. Here, the load 13 will be described.
When the power supply control unit 22 is given an activation signal, first, after the filter calculation means 4 sets an initial value to the (filter smoothing) coefficient α (S1), the W number calculation means 9 performs voltage / current measurement. The voltage value and current value detected for the load 13 are read from the means 8 (S3). Next, the W number calculating means 9 multiplies the read voltage value and current value to calculate the power consumption value (W number) of the load 13 and gives it to the filter calculating means 4 (S5).

The filter calculation means 4 determines whether or not the given number of W is greater than or equal to WA (for example, 5 W (Watt)) (S7). If not greater than WA, the (smoothing) coefficient α is set to NA ( After S19), the power supply voltage value Vd subjected to A / D conversion is read from the voltage measuring means 3 (S14).
If the given W number is greater than or equal to WA (S7), the filter calculation means 4 determines whether or not the W number is greater than or equal to WB (for example, 35 W (Watt)) (S9). (Smoothing) After the coefficient α is set to NB (S21), the A / D converted power supply voltage value Vd is read from the voltage measuring means 3 (S14).

If the given W number is equal to or greater than WB (S9), the filter calculation means 4 determines whether the W number is equal to or greater than WC (for example, 55W (Watt)) (S11). (Smoothing) After setting the coefficient α to NC (S23), the A / D converted power supply voltage value Vd is read from the voltage measuring means 3 (S14).
If the given W number is greater than or equal to WC (S11), the filter calculation means 4 sets the (smoothing) coefficient α to ND (S13), and then the power supply voltage value A / D converted from the voltage measurement means 3 Vd is read (S14). However, as described above, ND>NC>NB> NA.

The filter calculation means 4 uses the read power supply voltage value Vd (S14) as (detected voltage value), calculates the expression (1), performs filter calculation processing, and uses the filtered power supply voltage value Vr as the duty ratio. It gives to the calculating means 5 (S15).
The duty ratio calculation means 5 performs PWM control of the power supply voltage based on the supplied power supply voltage value Vr (S15) (S16).

When the duty ratio calculating means 5 executes the PWM control of the power supply voltage (S16), first, the power supply voltage value Vr is read (S25 in FIG. 3), and whether the power supply voltage value Vr is larger than a predetermined voltage value (for example, 13.2V). It is determined whether or not (S27).
If the power supply voltage value Vr is not greater than the predetermined voltage value (S27), the duty ratio calculation means 5 returns as it is.

If the power supply voltage value Vr is larger than the predetermined voltage value (S27), the duty ratio calculation means 5 calculates the equation (2) using the power supply voltage value Vr and calculates the duty ratio D (S29). Next, the calculated duty ratio D is output from the duty ratio output means 6 (S31), the switching circuit 10 is PWM-controlled, and the process returns.
When the power supply control unit 22 returns, it determines whether or not a stop signal (power supply off) is given (S17). If no stop signal is given, the W number calculation means 9 performs voltage / current measurement means. The voltage value and current value detected for the load 13 are read from 8 (S3).

Note that the operation (S3-13, S19-23) for setting the (filter smoothing) coefficient α based on the W number of power consumption of the load 13 does not need to be performed constantly, and the power consumption is increased when the load 13 is started. It only needs to be executed for a period until it stabilizes. During the other period, if no stop signal is given (S17), the power supply voltage value Vd subjected to A / D conversion is read from the voltage measuring means 3 (S14). When the power consumption of the load 13 is variable, an operation (S3-13, S19-23) for setting the coefficient α based on the W number of the power consumption of the load 13 when the power consumption is changed. Just do it.
If the stop signal is given (S17), the power controller 22 ends.

  FIG. 4 shows that when the voltage of the positive terminal + B of the battery B rises from 0V to 16V, the filter calculation means 4 executes the filter calculation processing with the start voltage 10.0V and the sampling period 10 ms according to the equation (1). It is a wave form diagram which shows the voltage value (filter applied voltage) output in this way. Here, the coefficient α in the equation (1) is 0.05, and the response delay until the filter application voltage reaches from 10 V to 13.2 V (predetermined voltage value) and the PWM control of the voltage of the plus terminal + B is started. Is 150 ms.

  FIG. 5 is a waveform diagram showing the voltage value (filter applied voltage) output by the filter calculation means 4 executing the filter calculation process according to the equation (1) under the same conditions as in FIG. In this case, however, the coefficient α in the equation (1) is 0.1, and the response delay until the filter application voltage reaches 10 to 13.2 V and the PWM control of the voltage at the plus terminal + B starts is 75 ms. Yes, increasing the (filter smoothing) coefficient α reduces the response delay.

In the first embodiment, the case where the loads 13, 14, and 15 are lamps has been described. However, even when the loads 13, 14, and 15 are motors, and even when the loads 13, 14, and 15 are heaters, A similar implementation is possible.
When the loads 13, 14, and 15 are motors, the coefficient α corresponds to the power consumption values of the loads 13, 14, and 15, and the maximum reduction effect (power saving effect) of the assumed power consumption is obtained. It is determined on the basis of actual measurement or calculation so that switching between DC drive and PWM drive of 13, 14, and 15 can be executed at a timing at which the user does not sense (feels no change in rotational sound).

  When the loads 13, 14, and 15 are heaters, the coefficient α corresponds to the power consumption values of the loads 13, 14, and 15, and the maximum reduction effect (power saving effect) of the assumed power consumption is obtained. The switching between the DC drive and the PWM drive of 13, 14, and 15 is determined based on actual measurement or calculation so that it can be executed at a timing when the user does not sense (for example, does not feel the fluctuation of the thawing speed of window icing).

(Embodiment 2)
FIG. 6 is a block diagram showing a schematic configuration of the second embodiment of the vehicle power supply control device according to the present invention.
In this vehicle power supply control device, electric power generated and rectified by an alternator (on-vehicle generator, AC generator) 1 is charged to a battery B, and a load which is a motor through each switching circuit 10, 11, 12. Power is supplied to 16, 17, and 18. When the battery B is not charged, the discharged power from the battery B is supplied to the loads 16, 17, and 18 through the switching circuits 10, 11, and 12.

The filter calculation means 4 performs digital filter processing on the read power supply voltage value with an IIR filter. This digital filter processing is performed by calculating equation (1) for each of the loads 16, 17, and 18.
(1-α) × (Voltage value output one cycle before)
+ Α × (detected voltage value) = voltage value (where 1 ≧ α> 0) (1)

For each of the loads 16, 17, and 18, the power supply voltage value that has been subjected to digital filter processing according to the expression (1) is given to the duty ratio calculation means 5. The duty ratio calculation means 5 uses the given power supply voltage value and predetermined voltage value (here, 13.2 V), and uses the expression (2) (13.2 / power supply voltage value) ² × 100 (% (2)
Thus, the duty ratio is calculated and given to the duty ratio output means 6.

  The duty ratio output means 6 performs PWM control of the switching circuits 10, 11, and 12 according to the given duty ratio, and the power supply voltage subjected to PWM control is supplied to the loads 16, 17, and 18, respectively. In the switching circuits 10, 11, and 12, when DC power is applied to the loads 16, 17, and 18, and the PWM control is not performed, the power source-loads 16, 17, and 18 are maintained in an on (connected) state.

The filter calculation means 4 stores a voltage value for fixing the (voltage value output before one cycle) of the filter calculation means 4 corresponding to the power consumption value to be detected by the loads 16, 17, and 18. A table (storage means) 4b is incorporated. The voltage value to be fixed is determined to be high / low according to the magnitude of the power consumption value.
The fixed voltage value corresponds to each power consumption value of the loads 16, 17, 18, and the maximum reduction effect (power saving effect) of the assumed power consumption is obtained, and the DC drive and PWM of the loads 16, 17, 18 are obtained. It is determined on the basis of actual measurement or calculation so that the switching of the drive can be executed at a timing when the user does not sense it (does not sense the fluctuation of the rotation sound).

The table 4b shows, for example, a fixed voltage value corresponding to the power consumption value W, VD corresponding to W ≧ WF, VC corresponding to WF> W ≧ WE, VB corresponding to WE> W ≧ WD, WD> W (In this case, WF>WE> WD, VD>VC>VB> VA).
The filter calculating means (reading means) 4 reads fixed voltage values corresponding to the respective power consumption values of the given loads 16, 17 and 18 from the table 4 b, and formula (1) for each of the loads 16, 17 and 18. Is calculated. The power supply voltage value for each of the loads 16, 17, and 18 calculated by the expression (1) is given to the duty ratio calculation means 5.

  The voltage measuring means 3, the filter calculating means 4, the duty ratio calculating means 5, the duty ratio output means 6, the voltage / current measuring means 8 and the W number calculating means 9 described above are constituted by a power supply control unit 22 provided with a microcomputer. The power supply control unit 22 is given a start / stop signal for each of the loads 16, 17, and 18 from the vehicle side. Since the other configuration of the second embodiment is the same as the configuration of the first embodiment (FIG. 1) described above, the description thereof is omitted.

Hereinafter, the operation of the vehicular power supply control apparatus having such a configuration will be described with reference to the flowchart of FIG. In this vehicle power supply control device, the loads 16, 17, and 18 are operated in parallel. Here, the load 16 will be described.
When the power supply control unit 22 is given an activation signal, first, after the filter calculation means 4 sets an initial value (voltage value output one cycle before) (S33), the W number calculation means 9 The voltage value and current value detected for the load 16 are read from the current measuring means 8 (S35). Next, the W number calculating means 9 multiplies the read voltage value and current value to calculate the power consumption value (W number) of the load 16 and gives it to the filter calculating means 4 (S37).

The filter calculation means 4 determines whether or not the given number of W is greater than or equal to WD (S39). If not greater than WD, (the voltage value output one cycle before) is set to VA (S51) The A / D converted power supply voltage value Vd is read from the voltage measuring means 3 (S46).
If the given W number is WD or more (S39), the filter calculation means 4 determines whether or not the W number is WE or more (S41). After the voltage value is set to VB (S53), the A / D converted power supply voltage value Vd is read from the voltage measuring means 3 (S46).

If the given W number is WE or more (S41), the filter calculation means 4 determines whether or not the W number is WF or more (S43). After the voltage value is set to VC (S55), the A / D converted power supply voltage value Vd is read from the voltage measuring means 3 (S46).
If the given number of Ws is equal to or greater than WF (S43), the filter calculation unit 4 sets the (voltage value output before one cycle) to VD (S45), and then A / D conversion is performed from the voltage measurement unit 3. The power supply voltage value Vd is read (S46). However, as described above, VD>VC>VB> VA.

The filter calculation means 4 uses the read power supply voltage value Vd (S46) as (detected voltage value), calculates the expression (1), performs filter calculation processing, and uses the filtered power supply voltage value Vr as the duty ratio. It gives to the calculating means 5 (S47).
The duty ratio calculation means 5 performs PWM control of the power supply voltage based on the supplied power supply voltage value Vr (S47) (S48).
Since the operation (S48) for executing the PWM control of the power supply voltage is the same as the operation (FIG. 3) for executing the PWM control of the first embodiment described above, the description thereof is omitted.

Note that the operation (S35 to 45, S51 to 55) for setting (the voltage value output one cycle before) based on the power consumption W number of the load 16 does not need to be always performed, It may be executed only during the period until the power consumption is stabilized. In other periods, if no stop signal is given (S49), the power supply voltage value Vd converted from analog to digital is read from the voltage measuring means 3 (S46). Further, when the power consumption of the load 16 is variable, when the power consumption is changed, an operation of setting (the voltage value output one cycle ago) based on the W number of the power consumption of the load 16 (S35) ˜45, S51˜55) may be executed.
The power supply control unit 22 ends if a stop signal is given (S49).

FIG. 8 shows that when the voltage at the positive terminal + B of the battery B rises from 0V to 16V, the filter calculation means 4 uses the expression (1) to start voltage (voltage value output one cycle before) 12.2V. FIG. 5 is a waveform diagram showing a voltage value (filter applied voltage) output by executing a filter calculation process at a sampling period of 10 ms.
Here, the coefficient α in the equation (1) is 0.05, and the filter application voltage reaches 12.2 V to 13.2 V (predetermined voltage value) until the PWM control of the voltage at the plus terminal + B is started. The response delay is 60 ms. Compared to the case of FIG. 4, the response delay is reduced from 150 ms to 60 ms by changing the start voltage from 10 V to 12.2 V.

In the second embodiment, the case where the loads 16, 17, and 18 are motors has been described. However, even when the loads 16, 17, and 18 are lamps and when the loads 16, 17, and 18 are heaters, A similar implementation is possible.
When the loads 16, 17, and 18 are lamps, (the voltage value output one cycle before) corresponds to the power consumption values of the loads 16, 17, and 18, and the maximum reduction effect of power consumption (saving) It is determined based on actual measurement or calculation so that switching between DC driving and PWM driving of the loads 16, 17, and 18 can be executed at a timing when the user does not sense (no flickering or the like).

  When the loads 16, 17, and 18 are heaters, (the voltage value output one cycle before) corresponds to the power consumption values of the loads 16, 17, and 18, and the maximum power consumption reduction effect (saving) Power effect) and switching between direct current drive and PWM drive of the loads 16, 17, 18 is not actually perceived by the user (eg, does not feel fluctuations in thawing speed of window icing, etc.) Determined based on calculations.

(Embodiment 3)
FIG. 9 is a block diagram showing a schematic configuration of the third embodiment of the vehicle power supply control device according to the present invention.
In this vehicle power supply control device, the electric power generated and rectified by the alternator (on-vehicle generator, AC generator) 1 is charged to the battery B, and the load serving as a heater is passed through each switching circuit 10, 11, 12. Power is supplied to 19, 20, and 21. When the battery B is not charged, the discharged power from the battery B is supplied to the loads 19, 20, and 21 through the switching circuits 10, 11, and 12.

  The power supply voltage values output from the alternator 1 and the battery B are detected by the voltage measuring means 3 through the power supply input circuit (filter) 2, A / D converted, and output. The power supply voltage value A / D converted and output by the voltage measuring means 3 is read by the filter calculating means (calculating processing means) 4 for each of the loads 19, 20, 21 at a predetermined sampling period. Note that the sampling period read by the filter calculation unit 4 is set to be the same as the sampling period in which the voltage measurement unit 3 performs A / D conversion.

The filter calculation means 4 performs digital filter processing on the read power supply voltage value with an IIR filter. This digital filter processing is performed by calculating equation (1) for each of the loads 19, 20, and 21.
(1-α) × (Voltage value output one cycle before)
+ Α × (detected voltage value) = voltage value (where 1 ≧ α> 0) (1)

For each of the loads 19, 20, and 21, the power supply voltage value that has been subjected to digital filter processing according to the expression (1) is given to the duty ratio calculation means 5. The duty ratio calculation means 5 uses the given power supply voltage value and predetermined voltage value (here, 13.2 V), and uses the expression (2) (13.2 / power supply voltage value) ² × 100 (% (2)
Thus, the duty ratio is calculated and given to the duty ratio output means 6.

  The duty ratio output means 6 performs PWM control of the switching circuits 10, 11, and 12 according to the given duty ratio, and the power supply voltage subjected to PWM control is supplied to the loads 19, 20, and 21, respectively. In the switching circuits 10, 11, and 12, when DC power is applied to the loads 19, 20, and 21, and the PWM control is not performed, the power source-loads 19, 20, and 21 are maintained in an on (connected) state.

The filter calculation means 4 stores a sampling cycle of voltage values (detected voltage values) to be read by the filter calculation means 4 in correspondence with the power consumption values to be detected by the loads 19, 20, and 21. (Storage means) 4c is incorporated. The sampling period is set to short / long according to the large / small power consumption value.
The sampling period corresponds to each power consumption value of the loads 19, 20, 21, and the maximum reduction effect (power saving effect) of the assumed power consumption is obtained, and the DC drive and PWM drive of the loads 19, 20, 21 are obtained. It is determined based on actual measurement or calculation so that the switching can be executed at a timing when the user does not sense it (for example, it does not feel the fluctuation of the thawing speed of window freezing).

The table 4c shows, for example, the sampling period of the voltage value to be read corresponding to the power consumption value W, TD corresponding to W ≧ WI, TC corresponding to WI> W ≧ WH, TB corresponding to WH> W ≧ WG. , WG> W corresponding to TA, where WI>WH> WG, TD <TC <TB <TA.
The filter calculation means (reading means) 4 reads the sampling periods corresponding to the power consumption values of the given loads 19, 20, 21 from the table 4c, respectively, and uses the voltage values read at the read sampling period (1). Calculate an expression. The power supply voltage value for each of the loads 19, 20, and 21 calculated by the expression (1) is given to the duty ratio calculation means 5.

  The voltage measuring means 3, the filter calculating means 4, the duty ratio calculating means 5, the duty ratio output means 6, the voltage / current measuring means 8 and the W number calculating means 9 described above are constituted by a power supply control unit 22 provided with a microcomputer. The power supply control unit 22 is given a start / stop signal for each of the loads 19, 20, and 21 from the vehicle side. Since the other configuration of the third embodiment is the same as the configuration of the first embodiment (FIG. 1) described above, description thereof is omitted.

The operation of the vehicular power supply control apparatus having such a configuration will be described below with reference to the flowchart of FIG. In this vehicle power supply control device, the loads 19, 20, and 21 operate in parallel. Here, the load 19 will be described.
When the power supply control unit 22 is given an activation signal, first, after the filter calculation means 4 sets an initial value to the sampling cycle of the voltage value to be read (S57), the W number calculation means 9 The voltage value and current value detected for the load 16 are read from the measuring means 8 (S59). Next, the W number calculating means 9 multiplies the read voltage value and current value to calculate the power consumption value (W number) of the load 19 and gives it to the filter calculating means 4 (S61).

The filter operation means 4 determines whether or not the given W number is equal to or greater than WG (S63). If not greater than WG, the sampling period of the voltage value to be read is set to TA (S75), and then sampling is performed. The power supply voltage value Vd subjected to A / D conversion is read from the voltage measuring means 3 at the period TA (S70).
If the given W number is greater than or equal to WG (S63), the filter calculation means 4 determines whether or not the W number is greater than or equal to WH (S65). If not greater than WH, the filter calculation means 4 determines the voltage value to be read. After setting the sampling cycle to TB (S77), the power supply voltage value Vd that has been A / D converted is read from the voltage measuring means 3 in the sampling cycle TB (S70).

If the given W number is WH or more (S65), the filter calculation means 4 determines whether or not the W number is WI or more (S67). After setting the sampling cycle to TC (S79), the A / D converted power supply voltage value Vd is read from the voltage measuring means 3 at the sampling cycle TC (S70).
If the given number of W is greater than or equal to WI (S67), the filter calculation means 4 sets the sampling period of the voltage value to be read as TD (S69), and then performs A / D from the voltage measurement means 3 at the sampling period TD. The converted power supply voltage value Vd is read (S70). However, as described above, TD <TC <TB <TA.

The filter calculation means 4 uses the read power supply voltage value Vd (S70) as (detected voltage value), calculates the expression (1), performs filter calculation processing, and uses the filtered power supply voltage value Vr as the duty ratio. It gives to the calculating means 5 (S71).
The duty ratio calculation means 5 performs PWM control of the power supply voltage based on the supplied power supply voltage value Vr (S71) (S72).
Since the operation (S72) for executing the PWM control of the power supply voltage is the same as the operation (FIG. 3) for executing the PWM control of the first embodiment described above, the description thereof is omitted.

Note that the operation (S59 to 69, S75 to 79) for setting the sampling period of the voltage value to be read based on the W number of power consumption of the load 19 does not need to be always performed, and the power consumption when the load 19 is started up. It is sufficient to execute only during the period until the value becomes stable. During other periods, if no stop signal is given (S73), the power supply voltage value Vd converted from analog to digital is read from the voltage measuring means 3 (S70). Further, when the power consumption of the load 19 is variable, when the power consumption is changed, an operation for setting a sampling period of the voltage value to be read based on the W number of the power consumption of the load 19 (S59 to 69). , S75 to 79) may be executed.
The power supply control unit 22 ends if a stop signal is given (S73).

FIG. 11 shows that when the voltage at the positive terminal + B of the battery B rises from 0V to 16V, the filter calculation means 4 uses the expression (1) to start voltage (voltage value output one cycle before) 10.0V. FIG. 6 is a waveform diagram showing a voltage value (filter applied voltage) output by executing a filter calculation process at a sampling period of 5 ms.
Here, the coefficient α in the equation (1) is 0.05, and the response delay until the filter application voltage reaches from 10 V to 13.2 V (predetermined voltage value) and the PWM control of the voltage of the plus terminal + B is started. Is 75 ms. Compared to the case of FIG. 4, the response delay is reduced from 150 ms to 75 ms by changing the sampling period from 10 ms to 5 ms.

In the third embodiment, the case where the loads 19, 20, and 21 are heaters has been described. However, even if the loads 19, 20, and 21 are lamps and the loads 19, 20, and 21 are motors, A similar implementation is possible.
When the loads 19, 20, and 21 are lamps, the sampling period of the voltage value corresponds to each power consumption value of the loads 19, 20, and 21, and an expected maximum reduction effect of power consumption (power saving effect) is obtained. Therefore, it is determined based on actual measurement or calculation so that switching between DC drive and PWM drive of the loads 19, 20, and 21 can be executed at a timing when the user does not sense (feels no flicker or the like).

  When the loads 19, 20, and 21 are motors, the maximum sampling effect of power consumption (power saving effect) is obtained in the sampling period of the voltage value corresponding to each power consumption value of the loads 19, 20, and 21. Therefore, it is determined based on actual measurement or calculation so that the switching between the DC drive and the PWM drive of the loads 19, 20, and 21 can be executed at a timing when the user does not sense (not feel the fluctuation of the rotation sound).

1 Alternator (car power supply)
2 Power input circuit (filter)
3 Voltage measuring means 4 Filter computing means (arithmetic processing means, reading means)
4a, 4b, 4c Table (storage means)
5 Duty ratio calculation means 6 Duty ratio output means 7 Output monitoring circuit (power detection means)
8 Voltage / current measurement means (power detection means)
9 W number calculation means (power detection means)
10, 11, 12 Switching circuit 22 Power control unit B Battery (vehicle power supply)

Claims (4)

Computation processing is performed on the voltage value of the in-vehicle power supply detected at a predetermined sampling period, and a computation processing means for outputting a voltage value with reduced fluctuation speed of the voltage value is provided, based on the voltage value output by the computation processing means, In the vehicle power supply control device that PWM-controls the voltage of the in-vehicle power supply to a predetermined voltage value and gives the PWM-controlled voltage to the load,
Means for detecting a power value consumed by the load, and means for changing the fluctuation speed to be higher / lower according to the magnitude of the power value detected by the means, the means being changed A vehicular power supply control device configured to perform PWM control on the voltage of the in-vehicle power supply based on a voltage value output by the arithmetic processing means performing arithmetic processing according to a fluctuation speed. Based on the voltage value of the in-vehicle power supply detected at a predetermined sampling cycle,
(1-α) × (Voltage value output one cycle before) + α × (Detected voltage value)
= Voltage value (where α is a coefficient of 1 ≧ α> 0)
And a power supply for the vehicle which applies a PWM control of the voltage of the in-vehicle power supply to a predetermined voltage value based on the power supply voltage value output from the arithmetic processing means and applies the voltage to the load. In the control device,
Power detection means for detecting a power value consumed by the load, storage means for storing a coefficient α determined to be large / small according to the magnitude of the power value to be detected by the power detection means, Means for reading a coefficient α corresponding to the power value detected by the power detection means from the storage means, and the arithmetic processing means calculates and outputs a power supply voltage value based on the coefficient α read by the means. A vehicle power supply control device, characterized in that: Based on the voltage value of the in-vehicle power supply detected at a predetermined sampling cycle,
(1-α) × V + α × (detected voltage value) = voltage value (where α is a coefficient of 1 ≧ α> 0)
The vehicle power supply control includes a calculation processing unit that calculates the voltage value and outputs the calculated voltage value, and based on the voltage value output by the calculation processing unit, the voltage of the in-vehicle power supply is PWM-controlled to a predetermined voltage value and applied to the load In the device
Power detection means for detecting a power consumption value consumed by the load, and storage means for storing a voltage value determined to be high / low according to the power consumption value to be detected by the power detection means And a means for reading from the storage means a voltage value corresponding to the power consumption value detected by the power detection means, and the arithmetic processing means calculates the voltage value as V and outputs the voltage value read by the means. It is comprised so that it may carry out. The vehicle power supply control apparatus characterized by the above-mentioned. Computation processing is performed on the voltage value of the in-vehicle power supply detected at a predetermined sampling period, and a computation processing means for outputting a voltage value with reduced fluctuation speed of the voltage value is provided, based on the voltage value output by the computation processing means, In the vehicle power supply control device that PWM-controls the voltage of the in-vehicle power supply to a predetermined voltage value and gives the PWM-controlled voltage to the load,
A power detection means for detecting a power value consumed by the load; a storage means for storing a sampling period set to short / long according to the magnitude of the power value to be detected by the power detection means; Means for reading a sampling period corresponding to the power value detected by the power detection means from the storage means, and the arithmetic processing means performs arithmetic processing on the voltage value of the in-vehicle power source detected in the sampling period read by the means. A power supply control device for a vehicle characterized by being configured to apply.

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