JP2006191758A - Power generation control unit for vehicles - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power generation control device for a vehicle capable of lengthening the service life of a storage battery without increasing fuel consumption. <P>SOLUTION: This power generation control device includes a vehicle information detector, a generated voltage regulator, and a controller. The generated voltage regulator, in which a storage battery and a capacitor are connected to an output terminal of a generator in parallel to an electric load, has a first reference voltage and a second reference voltage. In the controller, a first parallel circuit is connected between the output terminal of the generator and the storage battery, a second parallel circuit is connected between the output terminal of the generator and the capacitor, a first diode is connected so as to supply electric power from the storage battery to the electric load, a first relay is connected to the output of the generator so as to charge the storage battery with its contact in a connected state, a second diode is connected so as to supply electric power from the capacitor to the electric load, a second relay is connected to the output of the generator so as to charge the capacitor, and the first and second reference voltages and each connection/non-connection states of the first and second relays are set. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicular power generation control device, and more particularly to a vehicular power generation control device that controls the amount of power generated by a generator driven by the rotational force of a crankshaft of an engine.

  Various electric components are mounted on the vehicle, and the engine itself consumes electric power by each component such as an ignition system and a fuel system. For this reason, in order to charge the storage battery (lead battery) as a power supply, the engine is equipped with the alternator which is a generator which generates electric power using the rotational force of the crankshaft of the engine.

  An example of a vehicle power generation control device for a vehicle equipped with such an alternator is shown in FIG. In FIG. 5, 202 is a vehicle power generation control device for a vehicle (not shown), 204 is an alternator driven by an engine mounted on the vehicle to generate electric power, 206 is a storage battery as a chargeable / dischargeable power source, and 208 is an alternator 204 and storage battery 206. The electric load 210 is supplied with energy from at least one of the above and 210 is a control means.

  The alternator 204 includes a power generation unit 212, a rectifier 214, and a voltage regulator 216. The power generation unit 212 includes a stator coil 218 and a field coil 220, and generates a three-phase alternating current. The rectifier 214 has a plurality of diodes 222 to which the stator coil 218 is connected, and rectifies the three-phase alternating current. The voltage regulator 216 includes an output terminal B terminal 224, an input terminal IG terminal 226, an E terminal 228, an F terminal 230, and a C terminal 232, and controls the field current of the field coil 220.

  The voltage regulator 216 connects the positive side of the storage battery 206 and the electrical load 208 to the B terminal 224, connects the positive side of the storage battery 206 and the electrical load 208 to the IG terminal 226 via the ignition switch 234, and connects the B terminal 224. A stator coil 218 for generating a three-phase alternating current and a rectifier 214 are connected to the E terminal 228, and a field coil 220 that forms a magnetic field by a predetermined excitation current is connected to the B terminal 224 and the F terminal 230, The control means 210 is connected to the C terminal 232. An IG terminal 226 that is an input terminal is connected to the control means 10.

  The vehicle power generation control device 202 monitors the voltage of the storage battery 206 acting on the IG terminal 226 of the voltage regulator 216, and compares the internal reference voltage (for example, 14.5V) with the voltage of the storage battery 206 acting on the IG terminal 226. To do.

  When the voltage of the storage battery 206 acting on the IG terminal 226 is lower than the reference voltage, the voltage regulator 216 generates power by flowing a field current to the field coil 220, and the output voltage of the B terminal 224 that is an output terminal is generated by power generation. It rises and supplies electricity to the electric load 208 and the storage battery 206. Conversely, the voltage regulator 216 causes the field current to flow to the field coil 220 when the storage battery 206 is charged and the voltage of the storage battery 206 rises and the voltage of the storage battery 206 acting on the IG terminal 226 becomes higher than the reference voltage. To stop power generation.

  Further, the vehicle power generation control device 202 sets the internal reference voltage to a voltage higher than the open-circuit voltage of the storage battery 206 (for example, 14.4) by the ON / OFF signal sent from the control means 212 to the C terminal 232 of the voltage regulator 216. 5V) and a voltage lower than the open circuit voltage (for example, 12.5V). The voltage regulator 216 switches the ON / OFF signal acting on the C terminal 232 to set the internal reference voltage to a voltage lower than the open voltage of the storage battery 206, thereby reducing the amount of power generated by the alternator 204 and the load on the engine. To improve fuel efficiency.

Thus, in the conventional vehicle power generation control device, by switching the signal at the C terminal of the voltage regulator, the internal reference voltage is set to a voltage lower than the open-circuit voltage of the storage battery, and the power generation amount of the alternator is reduced. Technologies that reduce the load on the engine and improve fuel efficiency have been proposed.
Japanese Patent No. 3047542 JP 2003-224935 A JP 2004-72874 A

  However, in the techniques disclosed in these patent documents, when the internal reference voltage is set to a voltage lower than the open-circuit voltage of the storage battery, while the voltage of the storage battery falls to the internal reference voltage or while being set at the C terminal Is discharged from the storage battery to the electric load of the vehicle, and there is a problem that the discharge from the storage battery increases and the life of the storage battery is shortened.

In addition to the above-described method of reducing the reference voltage inside the voltage regulator, the vehicle power generation control device that reduces the load on the engine and improves the fuel efficiency, the reference voltage inside the voltage regulator is used as the operating condition of the engine. To improve the fuel efficiency of the engine, measure the power generation load of the alternator and control the reference voltage inside the voltage regulator, improve the fuel efficiency of the engine, and Increase the voltage of the storage battery to charge the storage battery more, and conversely lower the reference voltage inside the voltage regulator to lower the voltage of the storage battery to supply more power from the storage battery, reducing the work of the alternator and the engine A method of improving the fuel efficiency of the generator, a first power source that is always connected to the generator, and a second power source that can be arbitrarily connected to the generator When the vehicle is decelerating, the generator and the second power source are connected to recover the deceleration energy, and the power of the first power source is preserved to reduce the engine load caused by the operation of the generator, thereby improving fuel efficiency. A method of reducing has been proposed.
JP 58-131342 A JP-A-6-113599 Japanese Patent Laid-Open No. 5-130747 JP 2002-238103 A

  However, any of the methods disclosed in the above-mentioned patent documents has a problem that when the reference voltage inside the voltage regulator is lowered, the electric power discharged from the storage battery increases, and the fuel consumption of the engine is improved, but the life of the storage battery is shortened. there were. In addition, if the reference voltage inside the voltage regulator is increased and the battery is charged beyond the allowable level, the power that can be discharged from the storage battery increases. However, if the battery is charged beyond the allowable level, the life of the storage battery is shortened. It was.

  The present invention provides a vehicle information detection means for detecting information on the vehicle in a vehicle power generation control device that is provided with a vehicle mounted with an engine and a generator driven by the engine, and controls the power generation state of the generator. A storage battery and a capacitor connected in parallel with the electrical load with respect to the output terminal of the generator, a first reference voltage having a value higher than the open voltage of the storage battery, and lower than the open voltage of the storage battery A power generation voltage adjusting means for the generator having at least a second reference voltage having a value, and comprising a first diode and a first relay between the output terminal of the generator and the storage battery Connect a first parallel circuit, connect a second two parallel circuit consisting of a second diode and a second relay between the output terminal of the generator and the capacitor, the first diode, Said The battery is connected so that power can be supplied from the battery to the electric load, the first relay is connected to the storage battery so that the output of the generator can be charged when the contact is connected, and the second diode is connected to the capacitor The second relay is configured to connect the output of the generator to the capacitor so that the capacitor can be charged when the contact is in a connected state, and the generated voltage based on the vehicle information. Control means for setting the first and second reference voltages of the adjusting means, the connection / disconnection state of the first relay, and the connection / disconnection state of the second relay are provided.

  According to the vehicle power generation control device of the present invention, the first and second reference voltages of the power generation voltage adjusting means, the connection / disconnection state of the first relay, and the connection / non-connection of the second relay based on the vehicle information. By setting the connection state, the current generated by the generator can be switched appropriately between the storage battery and the capacitor according to the driving state of the vehicle, and the electricity between the storage battery and the capacitor can be switched appropriately. Therefore, the life of the storage battery can be extended without increasing the fuel consumption.

The vehicle power generation control device according to the present invention has the purpose of extending the life of the storage battery without increasing the fuel consumption, and the connection / disconnection state of the first and second reference voltages of the power generation voltage adjusting means and the first relay. By setting the connection / disconnection state of the second relay and the second relay, the storage battery and the capacitor are appropriately switched according to the driving state of the vehicle, and the electricity between the storage battery and the capacitor is appropriately switched. This is realized by supplying the electric load.
Embodiments of the present invention will be described below with reference to the drawings.

  1 to 3 show an embodiment of the present invention. In FIG. 1, 2 is a vehicle power generation control device mounted on a vehicle (not shown). The vehicle power generation control device 2 is an alternator 4 that is a generator that generates power by being driven by the rotational force of a crankshaft (not shown) of an engine mounted on the vehicle, and a first power source that can be charged and discharged. An electric load 10 (for example, a light or a controller) supplied with energy from at least one of a storage battery (lead battery) 6, a capacitor 8 as a second power source that can be charged and discharged, and an alternator 4, a storage battery 6, and a capacitor 8. ) And the control means 12, and controls the power generation state of the alternator 4.

  The alternator 4 includes a power generation unit 14, a rectifier 16, and a voltage regulator 18. The power generation unit 14 includes a stator coil 20 and a field coil 22, and generates a three-phase alternating current in the stator coil 20 by a field current supplied to the field coil 22. The rectifier 16 has a plurality of parallel diodes 24 to which the stator coil 20 is connected, and rectifies the three-phase alternating current. The voltage regulator 18 has an output terminal B terminal 26, an input terminal IG terminal 28, an E terminal 30, an F terminal 32, and a C terminal 34, and controls a field current supplied to the field coil 22. .

  The voltage regulator 18 connects the positive side of the storage battery 6, the positive side of the capacitor 8, and the electric load 10 in parallel to the B terminal 26, and connects the positive side of the storage battery 6 and the capacitor 8 to the IG terminal 28 via the ignition switch 36. The plus side and the electric load 10 are connected in parallel. Thereby, the alternator 4 connects the storage battery 6 and the capacitor 8 in parallel with the electric load 10 with respect to the B terminal 26.

  The voltage regulator 18 connects a stator coil 20 for generating a three-phase alternating current to the B terminal 26 and the E terminal 30 and the rectifier 16, and a magnetic field is applied to the B terminal 26 and the F terminal 32 by a predetermined excitation current. And the control means 12 is connected to the C terminal 34. An IG terminal 28 that is an input terminal is connected to the control means 12.

  The voltage regulator 18 is provided with generated voltage adjusting means 38 for adjusting the generated voltage of the alternator 4. The generated voltage adjusting means 38 includes at least a first reference voltage having a value higher than the open voltage of the storage battery 6 and a second reference voltage having a value lower than the open voltage of the storage battery 6. The generated voltage adjusting means 38 adjusts the generated voltage of the alternator 4 by changing the internal reference voltage to the first reference voltage and the second reference voltage.

  The alternator 4 connects a first parallel circuit 40 between the positive side of the storage battery 6 and the B terminal 26 and the IG terminal 28 of the voltage regulator 18. The first parallel circuit 40 includes a first diode 42 and a first relay 44. A plurality of (two) first diodes 42 are connected in series so that power can be supplied from the storage battery 6 to the electric load 10. The first diode 42 may be one, or two or more. The first relay 44 includes a connection / non-connection contact 44a and an operation coil 44b. The contact 44a is connected in parallel to the first diode 42 and the coil 44b is connected to the control means 12 for control. The coil 44b is operated by the means 12 and the output from the B terminal 26 of the alternator 4 is connected to the storage battery 6 so that the battery 44 can be charged when the contact 44a is connected.

  In the alternator 4, a second parallel circuit 46 is connected between the positive side of the capacitor 8 and the B terminal 26 and the IG terminal 28 of the voltage regulator 18. The second parallel circuit 46 includes a second diode 48 and a second relay 50. The second diode 48 is connected so as to be able to supply electric power from the capacitor 8 to the electric load 10. The second diode 48 may be one, or two or more. The second relay 50 includes a connection / non-connection contact 50a and an operation coil 50b. The contact 50a is connected in parallel to the second diode 48, and the coil 50b is connected to the control means 12 for control. The coil 50b is operated by the means 12 and the output from the B terminal 26 of the alternator 4 is connected to the capacitor 8 so that the capacitor 8 can be charged when the contact 50a is connected.

  The control means 12 is connected to vehicle information detection means 52 for detecting vehicle information. The vehicle information detection means 52 includes an idle switch 54 for detecting that the throttle valve of an engine (not shown) mounted on the vehicle is at an idle opening, an engine speed sensor 56 for detecting the engine speed, and the vehicle speed. It consists of a vehicle speed sensor 58 and the like for detecting, and detects a deceleration state or non-deceleration state of the vehicle.

  Based on the vehicle information input from the idle switch 54, the engine speed sensor 56, and the vehicle speed sensor 58 of the vehicle information input means 52, the control means 12 determines the first and second reference voltages of the power generation voltage adjusting means 38 and the first reference voltage. The connection / disconnection state of one relay 44 and the connection / disconnection state of the second relay 50 are set.

  That is, when the vehicle is decelerating, the control means 12 sets the reference voltage to the first reference voltage by the generated voltage adjustment means 38, sets the contact 44a of the first relay 44 to the non-connected state, The contact 50a of the relay 50 is set to a connected state.

  Further, the control means 12 sets the reference voltage to the second reference voltage by the generated voltage adjusting means 38 and sets the contact 44a of the first relay 44 to the non-connected state during engine operation other than during deceleration of the vehicle. Then, the contact 50a of the second relay 50 is set to the connected state.

  Further, when the engine is stopped, the control means 12 sets the reference voltage to the first reference voltage by the generated voltage adjustment means 38, sets the contact 44a of the first relay 44 to the connected state, and sets the second relay 44 to the connected state. 50 contact points 50a are set in a disconnected state.

  Next, the operation of this embodiment will be described.

  The vehicle power generation control device 2 monitors the voltage of the storage battery 6 and / or the capacitor 8 acting on the IG terminal 28 that is the input terminal of the voltage regulator 18 and compares the internal reference voltage with the voltage acting on the IG terminal 28. To do. When the voltage acting on the IG terminal 28 is lower than the reference voltage, the voltage regulator 18 generates power by flowing a field current to the field coil 22, and conversely, the voltage acting on the IG terminal 28 is higher than the reference voltage. In this case, the flow of the field current to the field coil 20 is stopped, and the power generation is stopped.

  In the vehicle power generation control device 2, an ON / OFF signal is applied to the C terminal 34 of the voltage regulator 18 based on the vehicle information input from the vehicle information input unit 52 by the control unit 12, and the generated voltage adjustment unit 38 The internal reference voltage is set to the first and second reference voltages, and the ON / OFF signal is applied to the coil 44b of the first relay 44 to set the contact 44a to the connected / disconnected state. An ON / OFF signal is applied to the coil 50b of the second relay 50 to set the contact point 50a to a connected / unconnected state, and control is performed so as to increase or decrease the power generation amount of the alternator 4.

  When the ignition switch 36 is turned on by the control means 12 as shown in FIG. 1, the vehicle power generation control device 2 starts the program (102), and the control routine operates, for example, every 10 msec.

  First, the vehicle power generation control device 2 determines whether the engine has been started or the engine has been stopped (104). Whether the engine has been started or the engine has been stopped is determined based on, for example, whether the engine speed, which is vehicle information, is 500 rpm or more.

  When this determination (104) is NO and the engine is stopped, the first relay 44 of the storage battery 6 that is the first power supply is set to the connected state, and the second relay of the capacitor 8 that is the second power supply. 50 is set to a disconnected state, an OFF signal is applied to the C terminal 34, and the internal reference voltage is set to the first reference voltage (for example, 14.7V) on the high voltage side by the generated voltage adjusting means 38 ( 106), the process returns to the determination (104).

  Thereby, the vehicle power generation control device 2 can supply electricity from the storage battery 6 to the electric load 10 of the vehicle.

  In the determination (104), if it is after the engine is started, it is determined whether or not the vehicle is decelerating (108). The deceleration state of the vehicle is determined, for example, based on whether the throttle valve idle switch 54, which is vehicle information, is ON and the vehicle speed is 10 km / h or higher.

  If this determination (108) is YES and the vehicle is in a decelerating state (FIG. 3: P1), the first relay 44 of the storage battery 6 is set to the non-connected state, and the second relay 50 of the capacitor 8 is connected. Then, an OFF signal is applied to the C terminal 34, and the internal reference voltage is set to the first reference voltage (for example, 14.7V) on the high voltage side by the generated voltage adjusting means 38 (110) (FIG. 3: P2) and return to the decision (104).

  As a result, when the vehicle is decelerating, the vehicle power generation control device 2 causes the alternator 4 to be rotated by the engine that is rotated by the deceleration energy of the vehicle. At this time, an OFF signal is applied to the C terminal 34 to set the internal reference voltage. When the first reference voltage (for example, 14.5 V) higher than the open voltage of the storage battery 6 and the capacitor 8 is set (FIG. 3: P2), the power generation amount of the alternator 4 increases (FIG. 3: P3), and the second Thus, it is possible to efficiently charge the capacitor 8 with the relay 50 connected to the capacitor 8 using the deceleration energy of the vehicle from the B terminal 26 of the alternator 4 (FIG. 3: P4). On the other hand, the storage battery 6 in which the first relay 40 is disconnected is not charged (FIG. 3: P5).

  When the determination (108) is NO and the vehicle is not in a decelerating state (FIG. 3: P6), the first relay 44 of the storage battery 6 is set to a disconnected state and the second relay 50 of the capacitor 8 is connected. And an ON signal is applied to the C terminal 34, and the internal reference voltage is set to the second reference voltage (for example, 12.5 V) on the low voltage side by the generated voltage adjusting means 38 (112) (FIG. 3). : P7), the process returns to the determination (104).

  Thus, the vehicle power generation control device 2 is in a vehicle deceleration state until immediately before (FIG. 3: P1), and the voltage of the capacitor 8 from the internal second reference voltage (for example, 12.5 V) (FIG. 3: P7). Is high, the electricity stored in the capacitor 8 can meet the demand of the electric load 10 of the vehicle, while the voltage of the capacitor 8 is higher than the internal second reference voltage (for example, 12.5 V). (FIG. 3: P8), the alternator 4 can be rested (FIG. 3: P9).

  After that, when the voltage of the capacitor 8 becomes the internal second reference voltage (for example, 12.5 V) (FIG. 3: P10), the alternator 4 starts generating power (FIG. 3: P11) and supplies the electric load 10 to the vehicle. Electricity is supplied and the capacitor 8 is charged as necessary.

  At this time, since the first relay 44 is not connected, the storage battery 6 is not charged from the B terminal 26 of the alternator 4 by the two first diodes 42, and the voltage of the storage battery 6 is further changed to the alternator. If the voltage drop of the first diode 42 is not more than the reference voltage of 4 (usually about 0.7V per diode, and 1.4V for 2 diodes), the storage battery 6 will not connect to the electric load 10 of the vehicle. Electricity is not supplied (FIG. 3: P5).

  For example, when the internal reference voltage is 12.5 V, when the voltage of the storage battery 6 is 13.9 V (12.5 V + 1.4 V) or less, no electricity is discharged from the storage battery 6 (FIG. 3: P5). ).

  In the conventional vehicle power generation control device, when the load on the engine of the alternator is reduced and the reference voltage inside the alternator is lowered (for example, 12.5 V) in order to improve fuel efficiency, the battery is discharged, and the load on the alternator is reduced. However, there is a problem that the life of the storage battery is shortened.

  On the other hand, the vehicle power generation control device 2 uses the electricity (FIG. 3: P4) stored in the capacitor 8 when the vehicle is decelerated (FIG. 3: P1), and after the vehicle is decelerated (FIG. 3: P6). When the vehicle is not in a decelerating state (FIG. 3: P7), the reference voltage inside the alternator 4 is lowered (for example, 12.5 V) (see FIG. 3: P9). 4-49) also has no discharge from the storage battery 6, so that the work of the alternator 4 can be reduced without affecting the life of the storage battery 6, and fuel efficiency can be improved. Note that the second power source can use a lithium ion battery in addition to the capacitor 4 having a high charge / discharge output density without affecting the life even when the charge / discharge is repeated.

  Further, when the electric load 10 of the vehicle rapidly increases, the voltage of the B terminal 26 of the alternator 4 decreases, the voltage of the capacitor 8 also decreases, and becomes a voltage lower than the voltage of the storage battery 6 by 1.4 V or more. Then, electricity is supplied to the electric load 10 of the vehicle through the first diode 42.

  Thus, this vehicle power generation control device 2 connects the storage battery 6 as the first power source and the capacitor 8 as the second power source in parallel to the B terminal 26 of the alternator 4 and the electric load 10 of the vehicle. Therefore, the current generated by the alternator 4 can be charged by switching to either the storage battery 6 or the capacitor 8, and the supply of electricity to the electrical load 10 can be switched from either the storage battery 6 or the capacitor 8. Can do.

  Further, in the vehicle power generation control device 2, the alternator 4 switches the internal reference voltage to at least two types of the first and second reference voltages by controlling the ON / OFF signal from the control means 12 to the C terminal 34. The internal reference voltage that can be switched is such that the first reference voltage with a high value is higher than the open voltage of the storage battery 6 as the first power source, and the second reference voltage with a low value is higher than the open voltage of the storage battery 6. Since the reference voltage inside the alternator 4 is switched, the high first reference voltage is set when the vehicle is decelerated, and the capacitor 8 is charged efficiently, except when the vehicle is decelerating. By setting the second reference voltage to a low value, the electricity charged in the capacitor 8 can be used to supply electricity from the capacitor 8 to the electric load 10 of the vehicle, and the alternator 4 can be stopped. That.

  Further, the vehicle power generation control device 2 includes at least one (preferably two) first diodes 42 between the storage battery 6, the B terminal 26 of the alternator 4 and the electric load 10 of the vehicle. Therefore, when the first relay 44 is not connected by the first diode 42 provided between the storage battery 6 and the alternator 4 and the electric load 10 of the vehicle, the reference voltage inside the alternator 4 is not connected. Is set to a second reference voltage lower than the open-circuit voltage of the storage battery 6, the first relay 44 that does not discharge from the storage battery 6 and can be ON / OFF controlled in parallel with the first diode 42. Therefore, even if the output voltage of the capacitor 8 or the alternator 4 is lowered, the capacitor 8 can switch the discharge to the electric load 10 of the vehicle. It is possible to supply electricity from the battery 6 to the electric load 10 of the vehicle through the diode 42.

  Furthermore, in this vehicle power generation control device 2, at least one (preferably one) second diode 48 is provided between the capacitor 8, the B terminal 26 of the alternator 4 and the electric load 10 of the vehicle. In addition, since the second relay 50 capable of ON / OFF control of the connection in parallel with the second diode 48 is provided, one or more second relays 50 provided between the capacitor 8 and the alternator 4 and the electric load 10 of the vehicle are provided. When the second relay 50 is turned off by the second diode 48, electricity can be supplied from the capacitor 8 via the second diode 48 even if the output of the storage battery 6 or the alternator 4 is lowered.

  In addition, the vehicle power generation control device 2 uses a capacitor 8 as a second power source, which is a battery having a high charge / discharge output density without affecting the service life even if charge / discharge is repeated. The capacitor 8 can be charged efficiently when the vehicle decelerates instead of the storage battery 6 as a power source. After the deceleration, the capacitor 8 can cover the electric load 10 instead of the storage battery 6 and the alternator 4. The fuel consumption of the vehicle can be improved. In addition, even if charging / discharging is repeated, a 2nd power supply does not have an influence on a lifetime, and can also be used as a lithium ion battery as a battery with high output density of charging / discharging.

  Thus, the vehicle power generation control device 2 includes the vehicle information detection means 52, and connects the storage battery 6 and the capacitor 8 in parallel with the electric load 10 to the B terminal 26 that is the output terminal of the alternator 4. A generator voltage adjusting means 38 of the alternator 4 having at least a first reference voltage having a value higher than the open voltage of the storage battery 6 and a second reference voltage having a value lower than the open voltage of the storage battery 6 is provided, and the alternator 4, a first parallel circuit 40 including a first diode 42 and a first relay 44 is connected between the B terminal 26 and the storage battery 6, and a second parallel circuit 40 is connected between the B terminal 26 of the alternator 4 and the capacitor 8. A second parallel circuit 46 composed of two diodes 48 and a second relay 50 is connected, and the first diode 42 is connected so as to be able to supply power from the storage battery 6 to the electric load 10, and the first relay 4 is connected so that the output of the alternator 4 can be charged to the storage battery 6 in a connected state, the second diode 48 is connected so as to be able to supply power from the capacitor 8 to the electric load 10, and the second relay 50 is connected When the contacts are connected, the output of the alternator 4 is connected to the capacitor 8 so as to be rechargeable, and the first and second reference voltages of the power generation voltage adjusting means 38 and the first relay 44 are connected / not connected based on the vehicle information. Control means 12 for setting the connection state and the connection / disconnection state of the second relay 50 is provided.

  As a result, the vehicle power generation control device 2 determines the first and second reference voltages of the power generation voltage adjusting means 38, the connection / disconnection state of the first relay 44, and the second relay based on the vehicle information. By setting the connection / disconnection state of 50, the current generated by the alternator 4 can be switched appropriately between the storage battery 6 and the capacitor 8 in accordance with the driving state of the vehicle, and can be charged appropriately. Electricity with the capacitor 8 can be appropriately switched and supplied to the electric load 10, and the life of the storage battery 6 can be extended without increasing the fuel consumption.

  That is, when the vehicle is decelerating, the control means 12 sets the reference voltage to the first reference voltage by the generated voltage adjusting means 38, sets the contact of the first relay 44 to the disconnected state, By setting the contact of the relay 50 to the connected state, the capacitor 8 can be efficiently charged using deceleration energy.

  Further, the control means 12 sets the reference voltage to the second reference voltage by the power generation voltage adjusting means 38 and sets the contact of the first relay 4 to the disconnected state when the engine is operating other than during deceleration of the vehicle. Then, by setting the contact point of the second relay 50 to the connected state, the power generation amount of the alternator 4 can be reduced without discharging from the storage battery 6, thereby reducing the fuel consumption and extending the life of the storage battery 6. Can do.

  Further, when the engine is stopped, the control means 12 sets the reference voltage to the first reference voltage by the power generation voltage adjusting means 38, sets the contact point of the first relay 44 to the connected state, and the second relay. By setting the 50 contacts to the non-connected state, the electric load 10 is supplied with electric power from the storage battery 6 when the engine is stopped. Therefore, the vehicle is provided with an engine automatic stop / start system (not shown). In this case, the electric load 10 can be sufficiently used.

  The first diode 42 of the first parallel circuit 40 is connected in series, and the difference between the power generation voltage of the alternator 4 and the voltage of the storage battery 6 is clarified. Thus, it is possible to supply electric power from the storage battery 6 to the electric load only when there is a state that cannot be covered by the amount of power generated by the alternator 4 alone.

  FIG. 6 shows a modification of the present invention. In this modification, the same reference numerals are given to the portions that perform the same functions as in the above-described embodiment.

  The vehicle power generation control device 2 of this modified example is an FET (field effect) in which a plurality of first parallel circuits 60 connected in series between an alternator 4 as a generator and a storage battery 6 as a first power source are connected in series. Transistor) 62, a second parallel circuit 64 connected between the alternator 4 and the capacitor 8 as the second power source is an FET (field effect transistor) 66, and each FET 62, 66 is connected to the control means 12. It is.

  The vehicle power generation control device 2 of this modified example can utilize the diode effect inside the FET by using the FETs 62 and 66 in the first and second parallel circuits 60 and 64, and the first embodiment of the first embodiment. The second diodes 42 and 48 can be eliminated. The first and second parallel circuits can use IGBTs (insulated gate bipolar transistors) instead of FETs. By using the IGBT, the first and second parallel circuits can use the diode effect inside the IGBT, and the first and second diodes 42 and 48 of the embodiment can be eliminated.

  Of course, the present invention is not limited to the above-described embodiments, and various application modifications are possible.

  For example, the vehicle power generation control device 2 sets the reference voltage to a first reference voltage that is higher than the open-circuit voltage of the storage battery 6 by the generated voltage adjustment means 38 during deceleration of the vehicle. Is set to a plurality of different values according to the deceleration state of the vehicle, and when the vehicle is decelerating, the first reference voltage is set to a different value according to the deceleration state so that the deceleration energy can be used more appropriately. The capacitor 8 can be charged efficiently.

  According to the vehicle power generation control device of the present invention, the storage battery and the capacitor are appropriately switched according to the driving state of the vehicle, and the electricity between the storage battery and the capacitor is appropriately switched and supplied to the electric load. It extends the life of the storage battery without increasing the fuel consumption, not only for vehicles equipped with engines but also for hybrid vehicles equipped with engines and traction motors, and electric vehicles equipped with traction motors, etc. It can also be applied to control.

It is an electric circuit diagram of the vehicle power generation control device showing an embodiment. It is a flowchart of control of the electric power generation control apparatus for vehicles. It is a timing chart of control of the power generation control device for vehicles. It is an electric circuit diagram of the vehicle electric power generation control apparatus which shows a modification. It is an electric circuit diagram of a vehicle power generation control device showing a conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Vehicle power generation control apparatus 4 Alternator 6 Storage battery 8 Capacitor 10 Electric load 12 Control means 14 Power generation part 16 Rectifier 18 Voltage regulator 20 Stator coil 22 Field coil 24 Diode 26 B terminal 28 IG terminal 30 E terminal 32 F terminal 34 C terminal 36 Ignition switch 38 Power generation voltage adjustment means 40 First parallel circuit 42 First diode 44 First relay 46 Second parallel circuit 48 Second diode 50 Second relay 52 Vehicle information detection means 54 Idle switch 56 Engine rotation Number sensor 58 Vehicle speed sensor

Claims (5)

  In a vehicle power generation control device that is provided with a vehicle mounted with an engine and a generator driven by the engine, and that controls the power generation state of the power generator, vehicle information detection means for detecting vehicle information is provided, and a storage battery And a capacitor connected in parallel with the electrical load with respect to the output terminal of the generator, provided with a first reference voltage having a value higher than the open voltage of the storage battery, and a value lower than the open voltage of the storage battery A first parallel circuit comprising a first diode and a first relay between an output terminal of the generator and the storage battery; and a generator voltage adjustment means for the generator having at least a second reference voltage. A second parallel circuit comprising a second diode and a second relay is connected between the output terminal of the generator and the capacitor, and the first diode is connected to the battery from the storage battery. The first relay is connected so as to be able to supply electric power to the electric load, and the output of the generator is connected to the storage battery so that the storage battery can be charged in a connected state, and the second diode is connected from the capacitor to the electric load. The second relay is connected so that power can be supplied to the load, and the output of the generator is connected to the capacitor so as to be able to be charged when the contact is in a connected state, and the generated voltage adjusting means is connected based on the vehicle information. Vehicular power generation control characterized by comprising control means for setting a first / second reference voltage, a connection / disconnection state of the first relay, and a connection / disconnection state of the second relay apparatus.   The control means sets the reference voltage to the first reference voltage by the power generation voltage adjusting means at the time of deceleration of the vehicle, sets the contact of the first relay to a disconnected state, and the second relay. The vehicle power generation control device according to claim 1, wherein the contact is set to a connected state.   The control means sets the reference voltage to the second reference voltage by the generated voltage adjusting means during engine operation other than during deceleration of the vehicle, and sets the contact point of the first relay to a disconnected state. The vehicle power generation control device according to claim 1, wherein the contact point of the second relay is set to a connected state.   When the engine is stopped, the control means sets the reference voltage to the first reference voltage by the power generation voltage adjusting means, sets the contact point of the first relay to the connected state, and sets the contact of the second relay. The vehicle power generation control device according to claim 1, wherein the contact is set in a non-connected state.   The vehicle power generation control device according to claim 1, wherein a plurality of the first diodes are connected in series.

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