JP2013169079A - Power supply system for automobile, vehicle and electricity supply method of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system for an automobile or the like that can avoid power generation during operation of an internal combustion engine in an insufficient charging state of a charger, suppress deterioration of fuel consumption and further supply sufficient power even at the time of activation of an idling stop and start device while being capable of preventing a battery from being exhausted in a vehicle mounted with the internal combustion engine.SOLUTION: A power supply system for an automobile comprises: a first electricity supply system having a first power generator driven by a driving shaft of an internal combustion engine and a first charger; and a second electricity supply system having a second power generator driven by a transmission shaft between the internal combustion engine and driving wheels and a second charger. The power supply system is configured such that a first switch is provided between the second power generator and the second charger, and a second switch is provided between the second charger and the first charger, respectively. In a case where a voltage of the second charger is lowered, the power supply system performs charging of the second charger by power generation of the second power generator while the vehicle is traveling.

Description

The present invention relates to an automobile power supply system that uses part of energy of an internal combustion engine by converting it into electricity, a vehicle including the same, and a method for supplying electricity to the vehicle.

  FIG. 4 shows the configuration of a conventional automotive power supply system 10X. This automobile power supply system 10X is used as a power supply for trucks, and a generator (generator) 11 is driven by an internal combustion engine (engine) 2 to generate electric power. The voltage of the generated electric power is about 28V by a regulator 12. And supplied to the electrical component 20 such as a headlight or a hazard lamp. Further, the remaining electric power that is not used is charged (charged) in a 24 V charger (battery: battery) 13 and used when the internal combustion engine 2 is stopped or started.

  However, with the progress of the idling stop technology, the electrical components are used even during the period in which the internal combustion engine has stopped operating, such as when the idling stop start (ISS) device is activated and idling is stopped. The battery may run out due to excessive use of electricity due to electrical components, and the internal combustion engine may not be restarted. As a result, there has been a problem in that fuel efficiency deteriorates when power is generated.

  In connection with this, an engine automatic stop device equipped with a dedicated sub-battery that is used as a starter power supply when restarting the idle stop control is proposed in addition to the main battery that is used as a starter power supply during normal start by key start operation. (For example, refer to Patent Document 1).

  However, the sub-battery of this automatic engine stop device is exclusively for restart at the time of automatic stop, and it suppresses the discharge by supplying power only to the starter, and the problem of the main battery going up due to the use of electrical components at the time of idling stop Cannot be resolved. Further, the sub-battery is charged by power feeding from the main battery side after the engine is automatically stopped, and it is considered that the capacity of the battery is substantially increased by adding the sub-battery.

JP 2008-309041 A

  The present invention has been made in view of the above situation, and its purpose is to increase the charging capacity of the charger and perform power generation and charging while the vehicle is running when the voltage of the second charger is reduced. It is possible to prevent the battery from running out, thereby avoiding power generation using energy generated by the internal combustion engine in a state where the charging state of the charger is insufficient, and suppressing deterioration in fuel consumption, Furthermore, the present invention provides an automobile power supply, a vehicle, and a vehicle electric supply method that can cover power consumption when starting an internal combustion engine and power consumption of electrical components even when an idle stop start device (ISS device) is operated. It is in.

  In order to achieve the above object, an automotive power supply system of the present invention includes a first generator driven by a drive shaft of an internal combustion engine, a first charger for charging electricity generated by the first generator, In an automobile power supply system having a first electric supply system having an electric wiring for supplying electricity from the first charger to an electrical component, it is directly or indirectly driven by a transmission shaft between the internal combustion engine and a drive wheel. A second electric generator, a second charger for charging electricity generated by the second generator, and an electric wiring for supplying electricity from the second charger to the first charger. A power supply system, a first switch provided in an electrical wiring between the second generator and the second charger, and a second electrical wiring between the second charger and the first charger. A switch, and the first switch When the second switch is disconnected, the voltage of the second charger is measured, and when the measured voltage value is equal to or less than a predetermined determination voltage value, the first switch is energized. And an electric control device that performs running power generation control in which the second switch is disconnected and the second charger is charged with electricity generated by the second generator.

  In other words, in addition to the first generator (ACG) and the first charger (battery), another set of the second generator and the second charger is provided, and the vehicle is running when the voltage of the second charger is reduced. The second generator is configured to generate electricity and charge the second charger.

  As a result, it is possible to prevent the battery from running out by increasing the charging capacity of the charger and generating power while the vehicle is running at the time when the voltage of the second charger is lowered, and the charging state of the charger is insufficient. The operation of the internal combustion engine can be avoided, and the deterioration of fuel consumption can be suppressed.

  In the above-described automobile power supply system, when the electric control device is in the case of normal running in which power is supplied by the first electric supply system during normal running of the vehicle when the measured voltage value is not less than or equal to the voltage value for determination. Control, braking control for charging the second charger with electricity generated by the second generator during braking of the vehicle, and electricity charged in the second charger during operation of the idle stop start device of the vehicle It is configured to perform control during idle stop start control supplied to the first charger.

  With this configuration, the power generation by the second generator and the charging of the second charger can be performed at the time of braking of the vehicle with a relatively simple configuration, and the electric power from the second charger can be obtained during the operation of the idle stop start device. The power consumption of the internal combustion engine and electrical components can be covered.

  And the vehicle of this invention for achieving said objective is comprised including said power supply system for motor vehicles. According to this configuration, the battery can be obtained by increasing the charging capacity of the charger and generating power with the second generator while the vehicle is running and braking when the voltage of the second charger is reduced and charging the second charger. The rise can be prevented, and the operation of the internal combustion engine when the charging state of the charger is insufficient can be avoided, so that the deterioration of fuel consumption can be suppressed. Furthermore, the power from the second charger can be covered by the electricity from the second charger when the idle stop start device, which is difficult to generate power by the first generator, is operated.

  And the electric supply method of the vehicle of this invention for achieving said objective is the 1st electric supply system which charges the 1st charger with the electricity which generate | occur | produced with the 1st generator driven by the drive shaft of an internal combustion engine. And a power supply system for a vehicle having a second electric supply system that charges the second charger with electricity generated by a second generator driven directly or indirectly by a transmission shaft between the internal combustion engine and the drive wheel. In the vehicle electric supply method, the voltage of the second charger is measured when the first switch and the second switch are disconnected, and the measured voltage value is set in advance as a determination voltage. If the value is less than the value, running power generation control is performed in which the first switch is energized and the second switch is disconnected to charge the second charger with electricity generated by the second generator. To do It is a method for the butterflies.

  That is, in addition to the first generator and the first charger, another set of the second generator and the second charger is provided, and during normal running, the first generator generates power and the voltage of the second charger During the traveling of the vehicle at the time of the decrease, the second generator can generate power and charge the second charger.

  As a result, it is possible to prevent the battery from running out by generating power while the vehicle is running at the time when the charging capacity of the charger is increased and the voltage of the second charger is lowered, and the charging state of the charger is insufficient. The operation of the internal combustion engine can be avoided and the deterioration of fuel consumption can be suppressed.

  Further, in the above-described vehicle electric supply method, when the measured voltage value is not less than or equal to the determination voltage value, normal running control in which the second generator does not generate electricity during normal running of the vehicle; During braking, the second generator generates electricity with the second generator and charges the second charger, and when the vehicle idle stop start device operates, the electricity charged in the second charger is Control during idle stop start control supplied to one charger is performed.

  In other words, by generating power with the second generator and charging the second charger when the vehicle is braked, the second charger is activated when the idle stop start device is more difficult to generate power with the first generator. Electric power can be used to cover power consumption in internal combustion engines and electrical components.

  As a result, the battery can be prevented from running out more by generating electricity during braking, and the operation of the internal combustion engine can be better avoided when the charging state of the charger is insufficient, thereby suppressing deterioration of fuel consumption. it can. Furthermore, the power from the second charger can be covered by the electricity from the second charger when the idle stop start device, which is difficult to generate power by the first generator, is operated.

  According to the automobile power supply system, the vehicle, and the vehicle power supply method according to the present invention, the battery power can be increased by performing power generation while the vehicle is running when the charging capacity of the charger is increased and the voltage of the second charger is decreased. In addition, the operation of the internal combustion engine in a state where the charging state of the charger is insufficient can be avoided, and deterioration of fuel consumption can be suppressed. Furthermore, even when the idle stop start device is in operation, it is possible to cover power consumption when starting the internal combustion engine and power consumption of electrical components.

It is a figure which shows the structure of the power supply system for motor vehicles of the 1st Embodiment of this invention. It is a figure which shows the structure of the power supply system for motor vehicles of the 2nd Embodiment of this invention. It is a figure which shows an example of the control flow of the electric power supply method of the vehicle of this invention. It is a figure which shows the power supply system for motor vehicles of a prior art.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an automotive power supply system, a vehicle, and a vehicle power supply method according to embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the automotive power supply system 10 according to the first embodiment of the present invention includes a second electricity supply system 10B in addition to the first electricity supply system 10A.

  The first electricity supply system 10A includes a first generator (AGC: generator) 11A driven by a drive shaft 2a of an internal combustion engine (engine) 2 and a first regulator that adjusts electricity generated by the first generator 11A. 12A, a 24V first charger (battery: battery) 13A for charging electricity whose voltage is adjusted to about 28V by the first regulator 12A, and an electric wiring 14Aa for connecting these devices 11A, 12A, 13A, The first charger 13A is configured to have an electrical wiring 21 that supplies electricity from the positive electrode to an electrical component 20 such as a headlight or a hazard lamp. Note that the negative pole of the first charger 13A is grounded by the electrical wiring 14Ab.

  Further, the second electricity supply system 10B includes a second generator 11B that is directly or indirectly driven by the transmission shaft 4 between the internal combustion engine 2 and the drive wheels 3, and electricity generated by the second generator 11B. A second regulator 12B to be adjusted, a 24V second charger 13B for charging electricity whose voltage is adjusted to about 28V by the second regulator 12B, and an electric wiring 14Ba for connecting these devices 11B, 12B and 13B, It has an electric wiring 14Bb for supplying electricity from the second charger 13B to the first charger 13A. The second regulator 12B is grounded by the electric wiring 14Bc, and the negative pole of the second charger 13B is grounded by the electric wiring 14Bd.

  In the second electric supply system 10B, a first switch 15 is further provided in the electric wiring 14Ba between the second regulator 12B and the second charger 13B, that is, the electric wiring 14Ba on the first generator 11B side. The second switch 16 is provided in the electrical wiring 14Bb between the positive electrode of the two charger 13B and the positive electrode of the first charger 13A. The first switch 15 and the second switch 16 are formed by an ON-OFF switch that is tangent to the energized state when the switch is ON and is disconnected when the switch is OFF.

  In the first embodiment, the voltage of the second charger 13B is set to be the same as the voltage of the first charger 13A (here, 24V). At the same time, the positive electrode of the second charger 13B is connected to the first switch 15 of the electric wiring 14Ba and the second switch 16 of the electric wiring 14Bb, respectively. Further, the second switch 16 is connected to the positive electrode of the first charger 13A, and the negative electrode of the second charger 13B is grounded by the electric wiring 14Bd.

  Further, an electric control device 17 that controls the first switch 15 and the second switch 16 is provided. When the vehicle 1 is traveling normally, the electric control device 17 turns off both the first switch 15 and the second switch 16, and disconnects the vehicle 1, and when braking the vehicle 1, turns on the first switch 15 and turns it on. At the same time, the second switch 16 is turned OFF to disconnect the electric power generated in the second generator 11B to charge the second charger 13B. When the idle stop start (ISS) device 18 of the vehicle 1 is operated, The first switch 15 is turned off and disconnected, and the second switch 16 is turned on and energized to control the electricity charged in the second charger 13B to be supplied to the first charger 13A. The electric control device 17 and the idle stop start device 18 are configured by being incorporated in an engine control device 30 that controls the entire engine, usually called an engine control unit (ECU).

  That is, in the automotive power supply system 10 of the first embodiment, the voltage of the second charger 13B of the second electricity supply system 10B is configured to be the same as the voltage of the first charger 13A, and the second The charger 13B is connected to the first switch 13A, and the second charger 13B is connected to the first charger 13A via the second switch 16. According to this configuration, the second charger 13B and the surrounding electric circuit can be configured with a relatively simple configuration.

  Next, the automobile power supply system 100 according to the second embodiment of the present invention shown in FIG. 2 will be described. Similar to the automobile power supply system 100 of the first embodiment, the second automobile power supply system 100 includes a second electricity supply system 10C in addition to the first electricity supply system 10A. However, the automotive power system 100 according to the second embodiment differs from the automotive power system 10 according to the first embodiment in the following points.

  In the second electricity supply system 10C, the second charger 13B has a 1 / N voltage (here, N = 2 and 12V) when N of the first charger 13A is a positive integer. The unit 13C and the second charging unit 13D are arranged in parallel. In addition, the positive electrodes of the first charging unit 13C and the second charging unit 13D are connected to the second regulator 12B by the electric wiring 14Ca, and are connected to the second switch 16 having the ON-OFF configuration by the electric wiring 14Cb, so that the first charging is performed. The negative poles of the unit 13C and the second charging unit 13D are connected to the first switch 15C by the electrical wiring 14Cc. The first switch 15C is configured to be connected to the second regulator 13B by the electric wiring 14Cd when turned on and to be grounded by the electric wiring 14Ce when turned off.

  In addition, an ON-OFF third switch 15Ca interlocked with the first switch 15C is connected to the electrical wiring 14Cf connecting the negative pole of the first charging unit 13C and the negative pole of the second charging unit 13D, and the positive of the first charging unit 13C. An electrical wiring 14Cg having a fourth switch 16a having an ON-OFF configuration that connects the electrode and the negative electrode of the second charging unit 13D and is linked to the second switch 16 is provided. That is, the third switch 15Ca and the fourth switch 16a are ON-OFF configured switches that are connected and can be energized when they are ON, and that are disconnected and cannot be energized when they are OFF.

  In the second embodiment, regarding the grounding, the negative electrode of the first charger 13A is grounded by the electric wiring 14Ab, and is grounded by the electric wiring 14Ce only when the first switch 15c is turned off. Configured. Other configurations are the same as those of the automobile power supply system 10 according to the first embodiment.

  In other words, when N is a positive integer (here 2), the second charger 13B of the second electricity supply system 10B is a voltage that is 1 / N (here 1/2) of the first charger 10A. N (in this case, two) charging units 13C and 13D having a configuration are arranged in parallel. The positive poles of the charging units 13C and 13D are connected to the electric wiring 14Ca on the second generator 11B side and to the second switch 16 having an ON-OFF configuration. Moreover, the negative poles of the charging units 13C and 13D are connected to the first switch 15 that is connected to the electric wiring 14Ca on the second generator 11B side when turned on and grounded when turned off.

  Further, the charging units 13C and 13D are connected in parallel by an electric wiring 14cf provided with a third switch 15Ca having an ON-OFF configuration. The third switch 15Ca is interlocked with the first switch 15. Further, the charging units 13C and 13D are configured to be connected in series by an electric wiring 14Cg provided with a fourth switch 16a having an ON-OFF configuration. The fourth switch 16 a is interlocked with the second switch 16. In the configuration of FIG. 2, the positive integer N is set to 2, but other positive integers such as 3, 4, 5, etc. may be used. However, it is about 2-4 practically.

  That is, when N is a positive integer, the second charger 13B of the second electricity supply system 10B is arranged in parallel with N charging units 13C and 13D having a voltage 1 / N of the first charger 13A. The positive poles of the charging units 13C and 13D are connected to the electric wiring 14Ca on the second generator 11B side and connected to the second switch 16, and the negative poles of the charging units 13C and 13D are The second switch 11C is connected to the electrical wiring 14Cd on the generator 11B side, connected to the first switch 15C configured to be grounded when OFF, and the charging units 13C and 13D are linked to the first switch 15C. Are connected in parallel by the electric wiring 14Cf provided respectively, and the charging units 13C and 13D are connected to the second switch 16 in conjunction with the fourth switch. Which are connected in series 16a an electric wire 14Cg provided respectively. According to this configuration, the second charger 13B and the electrical circuit around it can be configured with a relatively simple configuration even if the voltage is 1 / N of the charging units 13C and 13D of the first charger 13A.

  Next, a vehicle power supply method in the automobile power supply devices 10 and 100 according to the first and second embodiments will be described with reference to the control flow of FIG. The control flow of FIG. 3 is repeatedly called from the upper control flow activated by turning on the key switch of the vehicle 1 and executed with the upper control flow ending when the key switch of the vehicle 1 is turned off. Shown as a flow.

  When the control flow of FIG. 3 is called from the upper control flow and starts, in step S10, the voltage of the second charger 13B is measured when the first switch 15 and the second switch 16 are disconnected, It is determined whether or not the measured voltage value is less than or equal to a predetermined determination voltage value. This measurement is performed periodically (periodically) or irregularly at a preset time so that the first switch 15 and the second switch 16 are turned off and disconnected.

  If it is determined in step S10 that the measured voltage value is equal to or lower than the determination voltage value (YES), the process goes to step S20 to perform traveling power generation control.

  In the traveling power generation control in step S20, the first switch 15 is turned on to be in the energized state, the second switch 16 is turned off to be in the disconnected state, and power is generated by the second generator 11B to the second charger 13B. Charge the battery. Then, after a predetermined time set in advance, the return is made and the control flow returns to the upper control.

  If it is determined in step 10 that the measured voltage value is not equal to or lower than the determination voltage value (NO), the process goes to step S11, and in steps S11 to S15, the second generator 11B generates electricity during normal driving of the vehicle. Normal running control (S14) not to be performed, braking control (S15) in which electricity is generated by the second generator 11B to charge the second charger 13B during braking of the vehicle, and when the idle stop start device of the vehicle is in operation Then, idle stop start control time control (S12) for supplying electricity charged in the second charger 13B to the first charger 11B is performed. Then, after a predetermined time set in advance, the return is made and the control flow returns to the upper control.

  Hereinafter, the normal travel time control (S14), the brake time control (S15), and the idle stop start control time control (S12) will be described. In step S11, it is determined whether or not the idle stop start device (ISS device) 18 is operating. If it is determined in step S11 that the idle stop start device 18 is in operation (YES), the process goes to step S12, the first switch 15 is turned off to be disconnected, the second switch 16 is turned on, and the energized state (connection is established). State), the electricity charged in the second charger 13B is supplied from the second charger 13B to the first charger 13A, and the “power supply to the first charger” is performed in the idle stop start control. . Then, after a predetermined time set in advance, the return is made and the control flow returns to the upper control.

  In this case, in the second embodiment, more specifically, the first switch 15C is turned off to be in the ground state, the interlocked third switch 15Ca is turned off to be in the disconnected state, and the second switch 16 is turned off. And the fourth switch 16a is turned on to energize the first charging unit 13C and the second charging unit 13D from the first charging unit 13C and the second charging unit 13D connected in series. The power is supplied to the first charger 13A, and the “power supply to the first charger” is performed during the idle stop start control. Then, after a predetermined time set in advance, the return is made and the control flow returns to the upper control.

  On the other hand, if the idle stop start device 18 is not operating in the determination in step S11 (NO), the process goes to step S13 to determine whether or not the vehicle 1 is traveling normally. This determination is made as follows: “The accelerator switch is OFF (not depressed), the clutch switch is ON (clutch pedal is not depressed), and the neutral switch is ON (transmission (T / M) is neutral). If it is not ”,” or “Neither the brake switch is ON nor (the brake pedal is depressed)”, it is determined that the vehicle is traveling normally (YES). Goes to step S14, both the first switch 15 and the second switch 16 are turned OFF to bring them into a disconnected state, the power generation in the second generator 11B is stopped, and the first charger from the second charger 13B is stopped. The power supply to 13A is also stopped, and “stop of the second generator and stop of the power supply to the charger” of the normal traveling control is performed. Then, after a predetermined time set in advance, the return is made and the control flow returns to the upper control.

  In this case, in the second embodiment, more specifically, the first switch 15C is turned off to be in the ground state, the interlocked third switch 15Ca is turned off to be in the disconnected state, and the second switch 16 is turned off. And the fourth switch 16a is turned off to disconnect the power, and the power generation by the second generator 11B is stopped, and the power supply to the first charger 13A from the first charging unit 13C and the second charging unit 13D is also stopped. Then, “the second generator is stopped and the power supply to the charger is stopped” in the normal running control. Then, after a predetermined time set in advance, the return is made and the control flow returns to the upper control.

  In step S13, it is determined whether or not the vehicle is running normally, either "accelerator switch is OFF and clutch switch is ON and neutral switch is ON" or "brake switch is ON". In some cases, it is determined that the vehicle is not traveling normally (NO), that is, the vehicle is being braked. In this case, assuming that the vehicle and the internal combustion engine are at the time of braking, go to step S15, turn on the first switch 15 to turn on the power, turn off the second switch 16 and turn off the power, and turn on the second generator 11B. “Power generation by the second generator and charging by the second charger” of the control at the time of braking for generating and charging the second charger 13B is performed. Then, after a predetermined time set in advance, the return is made and the control flow returns to the upper control.

  In this case, in the second embodiment, more specifically, the third switch 15Ca linked to the first switch 15C is turned on to be in a connected state, and the second switch 16 and the fourth switch 16a are turned off. “Power generation and second charging by the second generator” of the control at the time of braking in which the power is generated by the second generator 11B in the disconnected state and the first charging unit 13C and the second charging unit 13D connected in parallel are charged. Charging with a container ”. Then, after a predetermined time set in advance, the return is made and the control flow returns to the upper control.

  By this control, when the first switch 15 and the second switch 16 are disconnected, the voltage of the second charger 13B is measured, and when the measured voltage value is equal to or lower than a preset determination voltage value. Was measured by performing traveling power generation control in which the first switch 15 is energized and the second switch 16 is disconnected, and the second charger 13B is charged with electricity generated by the second generator 11B. When the voltage value is not less than or equal to a predetermined determination voltage value, during normal driving of the vehicle 1, normal driving control in which both the first switch 15 and the second switch 16 are turned off to disconnect, and braking of the vehicle 1. Occasionally, the first switch 15 is turned on to enable energization, and the second switch 16 is turned off to disconnect and the second charger 13B is charged with electricity generated by the second generator 11B. When the idle stop start device 18 of the vehicle 1 is in operation, the first switch 15 is turned off to be in a disconnected state, and the second switch 16 is turned on to be in an energized state to charge the second charger 13B with electricity. Control during idle stop start control supplied to one charger 13A can be performed.

  Even in the second embodiment, the entire configuration including the first charging unit 13C, the second charging unit 13D, the third switch 15Ca, and the fourth switch 16a is the second charger 13B. The electric supply method is the same as that of the embodiment.

  And the vehicle of embodiment of this invention is comprised including said motor vehicle power supply system 10,100, can implement said electric supply method, The effect which motor vehicle power supply system 10,100 can show | play Can play.

  According to the automobile power supply system, the vehicle, and the electricity supply method of the present invention, the battery rises by generating and charging the vehicle while the vehicle is running when the charging capacity of the charger is increased and the voltage of the second charger is decreased. Thus, it is possible to avoid power generation using the energy generated by the internal combustion engine when the charging state of the charger is insufficient, and to suppress deterioration of fuel consumption. Even when the idle stop start device is in operation, the power consumption at the start of the internal combustion engine and the power consumption of the electrical components can be covered, so that it can be used for many automobiles.

1 Vehicle 2 Internal combustion engine
2a Drive shaft 3 Drive wheel 4 Transmission shaft 10, 100, 10X Automotive power supply system 10A First electric supply system 10B, 10C Second electric supply system 11A First generator 11B Second generator 12A First regulator 12B Second regulator 13A 1st charger 13B 2nd charger 13C 1st charging unit 13D 2nd charging unit 14Aa, 14Ab, 14Ba-14Bd, 14Ca-14Cg Electric wiring 15 1st switch 15Ca 3rd switch 16 2nd switch 16a 4th switch 17 Electric control device 18 Idle stop start device (ISS device)
20 Electrical component 21 Electrical wiring 30 Engine control device

Claims (5)

A first generator driven by a drive shaft of an internal combustion engine, a first charger for charging electricity generated by the first generator, and electrical wiring for supplying electricity from the first charger to electrical components In an automotive power supply system comprising a first electricity supply system having
A second generator that is driven directly or indirectly by a transmission shaft between the internal combustion engine and the drive wheel, a second charger that charges electricity generated by the second generator, and the second charger. A second electric supply system having an electric wiring for supplying the electricity to the first charger,
A first switch is provided in the electrical wiring between the second generator and the second charger; a second switch is provided in the electrical wiring between the second charger and the first charger;
Further, when the first switch and the second switch are in a disconnected state, the voltage of the second charger is measured, and when the measured voltage value is equal to or lower than a predetermined determination voltage value, An electric control device is provided that performs running power generation control in which the first switch is energized and the second switch is disconnected to charge the second charger with electricity generated by the second generator. A power supply system for an automobile. The electric control device is
In the case where the measured voltage value is not less than or equal to the voltage value for determination, during normal driving of the vehicle, normal driving control that supplies power with the first electric supply system;
Braking control for charging the second charger with electricity generated by the second generator during braking of the vehicle;
2. An idle stop start control time control for supplying electricity charged in the second charger to the first charger during operation of an idle stop start device of the vehicle is performed. The automotive power system described in 1.   A vehicle comprising the automobile power supply system according to claim 1. Directly or indirectly driven by a first electric supply system that charges a first charger with electricity generated by a first generator driven by a drive shaft of an internal combustion engine, and a transmission shaft between the internal combustion engine and drive wheels In a vehicle electric supply method including an automobile power supply system having a second electric supply system for charging a second charger with electricity generated by the second generator,
When the first switch and the second switch are in a disconnected state, the voltage of the second charger is measured, and when the measured voltage value is less than or equal to a predetermined determination voltage value, The vehicle electric power is controlled by charging the second charger with the electricity generated by the second generator with the first switch being energized and the second switch being disconnected. Supply method.   When the measured voltage value is not less than or equal to the determination voltage value, control during normal driving in which the second generator does not generate electricity during normal driving of the vehicle and electric power with the second generator during braking of the vehicle. Control during braking to charge the second charger and the idle stop start control for supplying electricity charged in the second charger to the first charger during operation of the idle stop start device of the vehicle The vehicle electric supply method according to claim 4, wherein control is performed.

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