JP2008289253A - Power supply controller for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply controller for vehicle which can improve fuel consumption of a vehicle more efficiently. <P>SOLUTION: The power supply controller 1 for vehicle comprises a power supply 3 for supplying power to a load consisting of constant power loads 2a1-m and constant resistance loads 2b1-n, a generator 4 to be driven by an engine to supply power to the load and the power supply 3, and a means 5 for controlling the generation voltage of the generator 4 based on the ratio of power of the constant resistance loads to power of the load. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power supply control device for a vehicle suitable for application to automobiles such as passenger cars, trucks, and buses.

Conventionally, as a vehicle power supply control device used for a vehicle, for example, there is one described in Patent Document 1. In such a vehicle power supply control device, when the voltage of a power source such as a battery and the voltage of a generator such as an alternator are larger than a load performance guarantee voltage lower limit value, PWM is performed between the power source and the generator and the load. A switch element that can be controlled is inserted to control the power supplied to the load to create a situation equivalent to the case where the performance guarantee voltage lower limit value is continuously applied to the load. As a result, unnecessary energy consumption is suppressed.
JP 2006-304515 A

  However, some vehicle power supply control devices supply power without considering the ratio of the load with a constant resistance and the power with a constant power. The change in the power generated by the generator due to the change does not prevent a deterioration in the fuel consumption of the generator, and thus the fuel consumption of the engine that drives the generator. There was a problem that improvement could not be achieved.

  In view of the above problems, an object of the present invention is to provide a vehicle power supply control device that can improve the fuel efficiency of a vehicle more efficiently.

In order to solve the above-described problems, a vehicle power supply control device according to the present invention includes:
A power source that supplies power to a load comprising a constant power load and a constant resistance load; a generator that is driven by an engine to supply power to the load and the power source; and And a control means for controlling based on the ratio of the power of the constant power load to the power supply.

Here, in the vehicle power supply control device,
Detection means for detecting the power of the load when the control means controls the power generation voltage of the generator to transition from a minimum value to a maximum value; and the constant power for the power of the load based on the detection result It is preferable to provide a calculation means for calculating the power ratio of the sexual load.

  The constant power load refers to a load with constant power consumption regardless of voltage, such as an EPS (Electronic Power Steering) brushless motor, and the constant resistance load is, for example, a lamp. Refers to a load whose resistance is constant regardless of voltage, and the power consumed in the constant resistance load is the square of the voltage divided by the resistance. Value.

  According to this, the control means changes the power generation voltage of the generator from the minimum value to the maximum value, and the detection means detects the power of the load. A second-order approximation of the detected load power with the variable as a variable is obtained by the least-square method, and the power consumed by the constant power load and the power consumed by the load are obtained from the second-order approximation. Thus, the ratio of the power of the constant power load to the power of the load can be calculated.

  Based on the ratio of the power of the constant power load to the power of the load calculated by the calculation means in this way, the control means controls the generated voltage of the generator, more specifically this ratio. By increasing the power generation voltage of the generator as the value of the generator increases, the power consumed in the constant resistance load among the loads is reduced in a situation where many of the constant resistance loads are operating. , And the energy consumed by the generator from the engine can be reduced to improve fuel efficiency.

  Here, instead of the ratio of the power of the constant power load to the power of the load, an absolute value of the power of the constant power load may be used as a parameter. In this case, the power generation voltage of the generator is increased as the absolute value of the power of the constant power load increases. Alternatively, the absolute value of the constant resistance load may be used as a parameter. In this case, the generated voltage of the generator is decreased as the absolute value of the power of the constant resistance load is increased.

In the vehicle power supply control device,
The timing at which the calculation means calculates the ratio of the constant power load power to the load power based on the detection result is either at a predetermined interval, immediately after engine start, or immediately after start of any of the loads. It is preferable.

  According to this, when any one of the loads is started by the user or automatically, the calculation unit is adapted to the load power that changes from moment to moment in response to the load starting condition. The power ratio of the constant power load can be calculated, and the control means controls the power generation voltage of the generator according to the starting condition of the load of the vehicle, thereby improving the fuel efficiency more efficiently. Can do.

In addition, in the vehicle power supply control device,
It is preferable that the power of the load is the power of the load when the control unit maximizes the power generation voltage of the generator.

  According to this, the calculation means can more easily calculate the ratio of the power of the constant power load to the power of the load.

In order to solve the above problems, a vehicle power supply control device according to the present invention includes:
A first power source for supplying power to a load comprising a constant power load and a constant resistance load; a generator driven by an engine; a second power source for storing power generated by the generator; and the second power source. A power converter that supplies power to the first power source and the load from the power supply, and a supply voltage to the first power source and the load of the power converter is a ratio of the power of the constant power load to the power of the load It can also be characterized by comprising control means for controlling based on the above.

  Note that this configuration is a so-called hybrid vehicle power supply configuration, and the power conversion device is, for example, a DC / DC converter, and any type such as a flyback type, a full bridge type, a chopper type, etc. may be used.

Here, in the vehicle power supply control device,
Detection means for detecting the power of the load when the control means controls the supply voltage of the power converter to transition from a minimum value to a maximum value; and the constant for the power of the load based on the detection result. It is preferable to provide a calculation means for calculating the power ratio of the power load.

  According to this, when the control means changes the supply voltage of the power converter from the minimum value to the maximum value, and the detection means detects the power of the load, for example, the calculation means A quadratic approximate expression of the detected load power with the voltage as a variable is obtained by a least square method, and the power consumed by the constant power load and the power consumed by the load are calculated from the quadratic approximate expression. It is possible to calculate the ratio of the power of the constant power load to the power of the load.

  Based on the ratio of the power of the constant power load to the power of the load calculated by the calculation means in this way, the control means controls the supply voltage of the power converter, more specifically, By increasing the supply voltage of the power conversion device as the ratio increases, the power consumed in the constant resistance load among the loads in a situation where the constant resistance load is operating a lot is reduced. The work amount of the power conversion device can be optimized, and the energy taken by the power conversion device from the engine can be reduced to improve fuel efficiency.

  Here, instead of the ratio of the power of the constant power load to the power of the load, the absolute value of the power of the constant power load may be used as a parameter. In this case, the supply voltage of the power converter is increased as the absolute value of the power of the constant power load increases. Alternatively, the absolute value of the constant resistance load may be used as a parameter. In this case, the larger the absolute value of the power of the constant resistance load, the lower the supply voltage of the power converter.

In the vehicle power supply control device,
The timing at which the calculation means calculates the ratio of the constant power load power to the load power based on the detection result is either at a predetermined interval, immediately after engine start, or immediately after start of any of the loads. It is preferable.

  According to this, when any one of the loads is started by the user or automatically, the calculation unit is adapted to the load power that changes from moment to moment in response to the load starting condition. The power ratio of the constant power load can be calculated, and the control means controls the supply voltage of the power converter according to the start condition of the load of the vehicle to improve the fuel efficiency more efficiently. be able to.

In addition, in the vehicle power supply control device,
The power of the load is preferably the power of the load when the control means maximizes the supply voltage of the power converter.

  According to this, the calculation means can more easily calculate the ratio of the power of the constant power load to the power of the load.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle power supply control apparatus which can aim at the fuel consumption improvement of a vehicle more efficiently can be provided.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a schematic diagram showing an embodiment of a vehicle power supply control device according to the present invention, and FIG. 2 is a schematic diagram showing a map used in an embodiment of a vehicle power supply control device according to the present invention. .

  The vehicular power supply control device 1 according to the first embodiment is driven by a load composed of constant power loads 2a1 to m and constant resistance loads 2b1 to n, a battery 3 for supplying power to these loads, and an engine. An alternator 4 for supplying power to these loads and the battery 3, and an alternator ECU (Electronic Control Unit) for controlling the generated voltage of the alternator 4 based on the ratio of the power of the constant power loads 2a1 to m to the power of these loads 5, a voltage sensor 6, a load control ECU 7 that controls each load, and current sensors 8 a 1 to m and 8 b 1 to n. The alternator ECU 5 and the load control ECU 7 are connected by a communication standard such as CAN (Controller Area Network). Note that m and n are arbitrary natural numbers.

  The battery 3 is a power source composed of a well-known lead-acid battery, and is connected to a load in parallel to supply power, and the amount of charge (SOC: State Of Charge) is controlled by an alternator 4 driven by an engine (not shown). Is.

  The alternator 4 is a generator that is driven by the engine and supplies power to the load and the battery 3, and the generated voltage is controlled by the alternator ECU 5. More specifically, the alternator 4 is controlled by PWM control based on a command of a three-phase armature coil, a three-phase full-wave rectifier, a field coil, and an alternator ECU 5 (not shown here), and the generated voltage determined by the alternator ECU 5 A transistor including an excitation current corresponding to the command value of Vreg is supplied to the field coil, and a flywheel diode connected in parallel to the field coil to allow a commutation current when the transistor is off to flow.

  The alternator ECU 5 includes, for example, a CPU, a ROM, a RAM, and a data bus that interconnects them. The alternator ECU 5 performs control described below according to a program stored in the ROM, a control unit 5a, a detection unit 5b, And an arithmetic means 5c.

  The load control ECU 7 includes, for example, a CPU, a ROM, a RAM, and a data bus that interconnects them. The load control ECU 7 performs each control described below according to a program stored in the ROM, and includes a constant power load 2a1. M, current sensors 8a1 to m, 8b1 to n corresponding to the constant resistance loads 2b1 to n, respectively, detect currents Ia1 to m and Ib1 to n of the respective loads, and the currents Ia1 to Ia1 through CAN are detected. The total ΣI of m and Ib1 to n is transmitted to the alternator ECU 5.

  The detection means 5b of the alternator ECU 5 is a battery in which the voltage sensor 6 measures the load power Pload described above when the control means 5a of the alternator ECU 5 controls the power generation voltage of the alternator 4 to transition from the minimum value to the maximum value. 3 and the current ΣI acquired from the load control ECU 7 via CAN by the calculation formula Pload = Vbat × ΣI.

  Further, the arithmetic means 5c of the alternator ECU 5 performs a second-order approximation of the load power Pload using the voltage Vbat as a variable by the least square method based on the actual measurement value of the detection result detected by the detection means 5b, as shown in FIG. An expression Pload = 1 / Rload × Vbat ^ 2 + Pconst is obtained, and a ratio Pconst / Ploadreal of the power Pconst of the constant power load to the power Ploadreal of the load at the maximum generated voltage is calculated.

  Note that the calculation means 5c of the alternator ECU 5 calculates the ratio of the power Pconst of the constant power load to the load power Pload based on the detection result of the detection means 5b at a predetermined interval, immediately after engine start, Any one immediately after starting or a combination thereof.

  Further, the control means 5a of the alternator ECU 5 shows the generated voltage of the alternator 4 based on the ratio RATIO = Pconst / Ploadreal of the constant power load power Pconst to the load power Ploadreal at the maximum generated voltage as shown in FIG. Determine and control using maps. That is, the current of the field coil is controlled so that the power generation voltage of the alternator 4 is increased as the ratio RATIO = Pconst / Ploadreal increases.

  Hereinafter, the control contents of the vehicle power supply control device 1 according to the first embodiment will be described with reference to flowcharts. 4 and 5 are flowcharts showing the control contents of an embodiment of the vehicle power supply control device according to the present invention.

  As shown in S <b> 1 of FIG. 4, the detection unit 5 b of the alternator ECU 5 detects the load current ΣI from the load control ECU 7 via CAN, and detects the voltage Vbat from the voltage sensor 6.

  Subsequently, in S2, the control means 5a of the alternator ECU 5 gradually increases or sweeps the generated voltage so as to shift the generated voltage of the alternator 4 from the minimum value to the maximum value. In S3, the detection means 5b of the alternator ECU 5 The load power Pload = Vbat × ΣI and the voltage Vbat are sampled, and the control means 5a of the alternator ECU 5 finishes gradually increasing the power generation voltage of the alternator 4 in S4.

  Subsequently, in S5, the computing means 5c of the alternator ECU 5 uses the detection result sampled in S4, that is, the actual measurement value, and uses the least square method to calculate the quadratic approximate expression Pload = 1 / Rload of the load power Pload using the voltage Vbat as a variable. Each coefficient of × Vbat ^ 2 + Pconst is calculated. Rload indicates the combined resistance of the constant resistance loads 2b1 to n, and Pconst indicates the power of the constant power loads 2a1 to m.

  Further, as shown in S11 of FIG. 5, the computing means 5c of the alternator ECU 5 acquires the load power Pload when the voltage Vbat is the maximum value, that is, Ploadreal, and acquires the power Pconst of the constant power load in S12.

  Further, in S13, the ratio RATIO = Pconst / Ploadreal of the constant power load to the load power Ploadreal is calculated, and in S14, the control means 5a of the alternator ECU 5 uses the map shown in FIG. Decide and control. That is, the current of the field coil is controlled so that the power generation voltage of the alternator 4 is increased as the ratio RATIO = Pconst / Ploadreal increases.

  According to the vehicle power supply control device 1 of the first embodiment described above, the following operational effects can be obtained. That is, when the control means 5a of the alternator ECU 5 changes the power generation voltage of the alternator 4 from the minimum value to the maximum value, and the detection means 5b detects the power of the load, the calculation means 5c loads the load with the voltage Vbat as a variable. Is obtained by a least square method, and the power Pconst consumed by the constant power load and the power Ploadreal consumed by the load are obtained from the quadratic approximate expression to obtain a constant for the load power Ploadreal. The ratio RATIO of the power Pconst of the power load can be calculated.

  Based on the ratio RATIO of the constant power load power Pconst to the load power Ploadreal calculated by the calculation means 5c in this way, the control means 5a controls the generated voltage of the alternator 4, that is, the ratio RATIO is large. By increasing the power generation voltage of the alternator 4 as much as possible, the power consumed by the constant resistance load among the loads is reduced in a situation where many constant resistance loads are operating, and the work of the alternator 4 is optimized. The energy consumed by the alternator 4 from the engine can be reduced to improve fuel efficiency.

  Here, instead of the ratio RATIO of the power of the constant power load to the load power, the absolute value of the power of the constant power load may be used as a parameter. In this case, the absolute power of the constant power load may be used. The power generation voltage of the alternator 4 is increased as the value increases. Alternatively, the absolute value of the constant resistance load may be used as a parameter. In this case, the generated voltage of the alternator 4 is decreased as the absolute value of the power of the constant resistance load is increased.

  Note that the timing at which the calculation means 5c calculates the ratio RATIO of the constant power load power Pconst to the load power Ploadreal based on the detection result is set at a predetermined interval immediately after the engine start or immediately after any of the loads starts. Thus, when one of the loads is started by the user or automatically started, the calculation means 5c makes the constant power load Pconst with respect to the load power Ploadreal corresponding to the load starting condition that changes every moment. The power ratio RATIO can be calculated, and the control means 5a can control the power generation voltage of the alternator 4 in accordance with the starting condition of the load of the vehicle, thereby improving the fuel efficiency more efficiently.

  In addition, the power Pload of the load used for the ratio RATIO is set to the power Ploadreal of the load when the control unit 5a maximizes the power generation voltage of the alternator 4, so that the calculation unit 5c has a constant power load with respect to the load power. The power ratio RATIO can be calculated more easily.

  The above-described technique can also be applied to a power supply configuration used for a hybrid vehicle. The second embodiment will be described below.

  FIG. 6 is a schematic diagram showing an embodiment of a vehicle power supply control device according to the present invention, and FIG. 7 is a schematic diagram showing a map used in an embodiment of the vehicle power supply control device according to the present invention. .

  The vehicle power supply control device 21 according to the second embodiment includes a battery 23 that supplies power to a load composed of constant power loads 22a1 to 22m and constant resistance loads 22b1 to n, and a generator as a generator driven by an engine. 24, a battery 25 that stores the power generated by the generator 24, a DC / DC converter 26 that supplies power from the battery 25 to the battery 23 and the load, and a supply voltage of the DC / DC converter 26 to the battery 23 and the load. DC / DC converter ECU27 which controls based on the ratio of the electric power of the constant power load with respect to the electric power of load, load control ECU28 which controls each load, voltage sensor 29, and current sensors 30a1-m and 30b1-n are provided. . The DC / DC converter ECU 27 and the load control ECU 28 are connected by a communication standard such as CAN.

  The battery 23 is a low-voltage first power source composed of a well-known lead storage battery, and is connected to a load in parallel to supply power, and a DC / DC converter 26 (to be described later) supplies a state of charge (SOC). It is to be controlled.

  The battery 25 is a high-voltage second power source constituted by a known nickel metal hydride battery, and the amount of charge (SOC: State Of Charge) is controlled by a generator 24 driven by an engine (not shown). Here, the description of the control system of the generator 24 is omitted.

  The DC / DC converter 26 is, for example, a flyback type DC / DC converter, and is a power conversion device mainly including a flyback transformer, a MOSFET, a diode, and a capacitor (not shown). The current flowing in the primary winding of the back transformer is controlled, an alternating voltage proportional to the winding ratio is generated in the secondary winding of the flyback transformer, and the direct current is rectified to a direct current by a diode and a capacitor. The supply voltage to 23 is raised or lowered.

  The DC / DC converter ECU 27 includes, for example, a CPU, a ROM, a RAM, and a data bus that interconnects them. The control unit 27a and the detection unit perform each control described below in accordance with a program stored in the ROM. 27b and calculating means 27c.

  The load control ECU 28 includes, for example, a CPU, a ROM, a RAM, and a data bus that interconnects them. The load control ECU 28 performs each control described below in accordance with a program stored in the ROM, and includes a constant power load 22a1. -M, current sensors 28a1-m and 28b1-n corresponding to the constant resistance loads 22b1-n respectively detect the currents Ia1-m, Ib1-n of the respective loads and calculate the total ΣI, via CAN The total ΣI of the currents Ia1 to m and Ib1 to n is transmitted to the DC / DC converter ECU 27.

  The detection unit 27b of the DC / DC converter ECU 27 uses the voltage sensor 29 to calculate the load power Pload described above when the control unit 27a controls the supply voltage of the DC / DC converter 26 to transition from the minimum value to the maximum value. From the measured voltage Vbat of the battery 23 and the current ΣI acquired from the load control ECU 28 via CAN, it is calculated and detected by the formula of Pload = Vbat × ΣI.

  Further, the calculation means 27c of the DC / DC converter ECU 27 calculates the load power Pload using the voltage Vbat as a variable by the least square method based on the actually measured value of the detection result detected by the detection means 27b, as shown in FIG. A quadratic approximate expression Pload = 1 / Rload × Vbat ^ 2 + Pconst is obtained, and a ratio RATIO = Pconst / Ploadreal of the power Pconst of the constant power load to the power Ploadreal of the load at the maximum supply voltage is calculated.

  It should be noted that the calculation means 27c of the DC / DC converter ECU 27 calculates the ratio RATIO of the constant power load power Pconst to the load power Pload based on the detection result of the detection means 27b at a predetermined interval immediately after the engine is started. , Either immediately after starting any of the loads, or a combination thereof.

  Further, the control means 27a of the DC / DC converter ECU 27 determines the supply voltage of the DC / DC converter 26 based on the ratio RATIO = Pconst / Ploadreal of the constant power load power Pconst to the load power Ploadreal at the maximum supply voltage. Are determined and controlled using the map shown in FIG. That is, control is performed so that the supply voltage of the DC / DC converter 26 increases as the ratio RATIO = Pconst / Ploadreal increases.

  Hereinafter, the control content of the vehicle power supply control device 21 according to the second embodiment will be described with reference to a flowchart. 9 and 10 are flowcharts showing the control contents of an embodiment of the vehicle power supply control device according to the present invention.

  As shown in S31 of FIG. 9, the detection means 27b of the DC / DC converter ECU 27 detects the load current ΣI from the load control ECU 28 via CAN, and detects the voltage Vbat from the voltage sensor 29.

  Subsequently, in S32, the control means 27a of the DC / DC converter ECU 27 gradually increases or sweeps the supply voltage so as to shift the supply voltage of the DC / DC converter 26 from the minimum value to the maximum value. The detection means 27b of the DC converter ECU 27 samples the load power Pload = Vbat × ΣI and the voltage Vbat, and the control means 27a of the DC / DC converter ECU 27 finishes gradually increasing the supply voltage of the DC / DC converter 26 in S34. To do.

  Subsequently, in S35, the calculation means 27c of the DC / DC converter ECU 27 uses the detection result sampled in S34, that is, the actual measurement value, and uses the least squares method to calculate the quadratic approximate expression Pload = Load power Pload using the voltage Vbat as a variable. Each coefficient of 1 / Rload × Vbat ^ 2 + Pconst is calculated. Rload indicates the combined resistance of the constant resistance loads 2b1 to n, and Pconst indicates the power of the constant power loads 2a1 to m.

  Further, as shown in S41 of FIG. 10, the calculation means 27c of the DC / DC converter ECU 27 obtains the load power Pload, that is, Ploadreal when the voltage Vbat is the maximum value, and in S42, the power Pconst of the constant power load is obtained. get.

  Further, in S43, the calculation means 27c of the DC / DC converter ECU 27 calculates the ratio RATIO = Pconst / Ploadreal of the constant power load to the load power Ploadreal. In S44, the control means 27a of the DC / DC converter ECU 27 The supply voltage of the DC / DC converter 26 is determined and controlled using the map shown in FIG. That is, control is performed so that the supply voltage of the DC / DC converter 26 increases as the ratio RATIO = Pconst / Ploadreal increases.

  According to the vehicle power supply control device 21 of the second embodiment described above, the following operational effects can be obtained. That is, when the control means 27a of the DC / DC converter ECU 27 changes the supply voltage of the DC / DC converter 26 from the minimum value to the maximum value, and the load power is detected by the detection means 27b, the calculation means 27c is supplied. Obtain the load power approximated by the least square method using the voltage as a variable, and calculate the power consumed by the constant power load and the power consumed by the load from the quadratic approximate equation. A ratio RATIO of the power Pconst of the constant power load with respect to Ploadreal can be calculated.

  Based on the ratio RATIO of the constant power load power Pconst to the load power Ploadreal calculated by the calculation means 27c in this way, the control means 27a controls the supply voltage of the DC / DC converter 26, that is, this ratio. By increasing the supply voltage of the DC / DC converter ECU 26 as the RATIO is larger, the power consumed in the constant resistance load among the loads is reduced in a situation where many constant resistance loads are operating. The work amount of the converter 26 can be optimized, the energy taken by the DC / DC converter 26 from the engine can be reduced, and the fuel consumption can be improved.

  Here, instead of the ratio RATIO of the power of the constant power load to the load power, the absolute value of the power of the constant power load may be used as a parameter. In this case, the absolute power of the constant power load may be used. The larger the value is, the larger the supply voltage of the DC / DC converter 26 is. Alternatively, the absolute value of the constant resistance load may be used as a parameter. In this case, the supply voltage of the DC / DC converter ECU 26 is decreased as the absolute value of the power of the constant resistance load is increased.

  Note that the timing at which the calculation means 27c calculates the ratio RATIO of the constant power load Pconst to the load power Ploadreal based on the detection result is set at a predetermined interval, immediately after engine startup, or immediately after starting any of the loads. Thus, the following effects can be obtained.

  That is, when any of the loads is started by the user or automatically started, the calculation means 27c can adjust the constant power load with respect to the load power Ploadreal in response to the load starting condition that changes every moment. The ratio RATIO of the electric power Pconst can be calculated, and the control means 27a can control the supply voltage of the DC / DC converter 26 in accordance with the starting condition of the load of the vehicle, thereby improving the fuel efficiency more efficiently.

  In addition, the control unit 27a of the DC / DC converter ECU 27 sets the load power to the load power Ploadreal when the supply voltage of the DC / DC converter 26 is maximized, so that the calculation unit 27c The power ratio RATIO of the constant power load can be calculated more easily.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions are made to the above-described embodiments without departing from the scope of the present invention. be able to.

  For example, in the first embodiment described above, after the load control ECU 7 that controls the load measures the current of each load and calculates the sum of those currents as ΣI, the detection means 5b of the alternator ECU 5 calculates the product of ΣI and the voltage Vbat. However, the load power Pload may be obtained indirectly by detecting the output of the alternator 4 and the input / output power of the battery 3.

  Similarly, in the second embodiment, the detection unit 27b of the DC / DC converter ECU 27 may indirectly obtain the load power Pload from the output of the DC / DC converter 26 and the input / output power of the battery 23.

  The present invention relates to a vehicle power supply control device applied to an automobile, and can improve the fuel efficiency of a vehicle more efficiently by adding relatively minor devices and changing control contents. It can be applied to various vehicles such as trucks and buses.

It is a mimetic diagram showing one embodiment of a power supply control device for vehicles concerning the present invention. It is a schematic diagram which shows the detection result of one Embodiment of the power supply control apparatus for vehicles concerning this invention. It is a schematic diagram which shows the map used for one Embodiment of the vehicle power supply control apparatus concerning this invention. It is a flowchart which shows the control content of one Embodiment of the vehicle power supply control apparatus concerning this invention. It is a time chart which shows the control result of one Embodiment of the vehicle power supply control apparatus concerning this invention. It is a mimetic diagram showing one embodiment of a power supply control device for vehicles concerning the present invention. It is a schematic diagram which shows the detection result of one Embodiment of the power supply control apparatus for vehicles concerning this invention. It is a schematic diagram which shows the map used for one Embodiment of the vehicle power supply control apparatus concerning this invention. It is a flowchart which shows the control content of one Embodiment of the vehicle power supply control apparatus concerning this invention. It is a time chart which shows the control result of one Embodiment of the vehicle power supply control apparatus concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle power supply control apparatus 2a1-m, 2b1-n Load 3 Battery 4 Alternator 5 Alternator ECU
5a Control means 5b Detection means 5c Calculation means 6 Voltage sensor 7 Load control ECU
8a1-m, 8b1-n Current sensor 21 Power supply control device for vehicle 22a1-m, 22b1-n Load 23 Battery 24 Generator 25 Battery 26 DC / DC converter 27 DC / DC converter ECU
27a control means 27b detection means 27c calculation means 28 load control ECU
29 Voltage sensors 30a1-m, 30b1-n Current sensors

Claims (8)

  A power source that supplies power to a load comprising a constant power load and a constant resistance load; a generator that is driven by an engine to supply power to the load and the power source; and A vehicle power supply control device comprising control means for controlling based on a ratio of the power of the constant power load to the power supply.   Detection means for detecting the power of the load when the control means controls the power generation voltage of the generator to transition from a minimum value to a maximum value; and the constant power for the power of the load based on the detection result The vehicle power supply control device according to claim 1, further comprising calculation means for calculating a power ratio of the sexual load.   The timing at which the computing means computes the ratio of the constant power load power to the load power based on the detection result is either at a predetermined interval, immediately after engine start or immediately after start of any of the loads. The vehicular power supply control device according to claim 2.   4. The vehicle power supply control device according to claim 2, wherein the power of the load is the power of the load when the control unit maximizes the power generation voltage of the generator. 5.   A first power source for supplying power to a load comprising a constant power load and a constant resistance load; a generator driven by an engine; a second power source for storing power generated by the generator; and the second power source. A power converter that supplies power to the first power source and the load from the power supply, and a supply voltage to the first power source and the load of the power converter is a ratio of the power of the constant power load to the power of the load A power supply control device for a vehicle comprising control means for performing control based on the control means.   Detection means for detecting the power of the load when the control means controls the supply voltage of the power converter to transition from a minimum value to a maximum value; and the constant for the power of the load based on the detection result. 6. The vehicle power supply control device according to claim 5, further comprising calculation means for calculating a power ratio of the power load.   The timing at which the computing means computes the ratio of the constant power load power to the load power based on the detection result is either at a predetermined interval, immediately after engine start or immediately after start of any of the loads. The vehicular power supply control device according to claim 6.   The vehicle power supply control device according to claim 6 or 7, wherein the power of the load is the power of the load when the control means maximizes the supply voltage of the power converter.

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