JP2006217765A - Vehicular dynamo controlling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the brightness of a lighting apparatus 2 from fluctuating when an output voltage of a dynamo 6 is changed over according to the driving state of a vehicle. <P>SOLUTION: This controlling device comprises first and second batteries 3, 4 connected in parallel. A switch 8 is provided in a feeding circuit 1 to which the dynamo 6 driven by an engine is connected. When the vehicle is put into a deceleration state with the lighting apparatus 2 switched on, it is configured to interrupt power supply from the dynamo 6 to the lighting apparatus 2 and the second battery 4, and to supply electric power to the lighting apparatus 2 from the second battery 4 only, by turning off the switch 8 before the output voltage of the dynamo 6 is increased. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

    The present invention relates to a control device for a vehicular generator.

    When the vehicle is decelerating, the output voltage of the generator driven by the engine is increased to charge the battery, thereby recovering deceleration energy and improving fuel economy, and by reducing the output voltage when not decelerating, It is generally known to improve acceleration performance by reducing engine load. However, when the output voltage is switched, there is a problem that the power supply voltage to the lighting device such as a headlight connected to the generator fluctuates and the lighting device suddenly becomes brighter or darker.

    On the other hand, it is known that the brightness of the lamp is prevented from changing suddenly by gradually bringing the output voltage close to the target voltage (see Patent Document 1).

    On the other hand, in an engine automatic stop system that stops the engine when the vehicle stops at an intersection or the like and restarts the engine when the vehicle starts, it is also known that two batteries are provided to improve restartability. (See Patent Document 2). In other words, while the engine is running, the two batteries are connected in parallel, and when the engine is restarted, both batteries are connected in series so that a high starting voltage can be obtained even when the battery charge is small. is there.

In addition, two batteries are connected in parallel, and when the engine is stopped, only one battery can cover the electric load for the lighting and air conditioning, so that the other battery is not consumed and restarting the engine It is also known to improve restartability by covering with a small other battery.
JP-A-5-103433 JP 2003-155968 A

    If the output voltage of the generator is gradually changed, it is possible to prevent the brightness of the lamp from changing suddenly. However, while the output voltage is gradually changed, energy recovery when the vehicle is decelerated is recovered. In addition, the engine load is not sufficiently reduced when the vehicle is not decelerated.

    Therefore, in the case where the two-battery system is adopted for the power source for the vehicle, the present invention gradually uses the two batteries depending on the driving state of the vehicle and whether or not the lighting device is lit, thereby gradually increasing the output voltage. It is an object to prevent fluctuations in the brightness of a lighting device without being changed.

    In response to such a problem, the present invention cuts off the power supply from the generator to one of the two batteries and the lamp when the vehicle is decelerated while the lamp is on, and the power supply is cut off. Only one battery was powered by the lamp.

That is, the invention according to claim 1 has a first battery and a second battery connected in parallel, and a power feeding circuit that feeds an electric load for a vehicle including a lighting device,
A generator driven by the engine and connected to the power supply circuit to supply power to the first battery, the second battery and the vehicle electrical load;
Vehicle operating state detecting means for detecting deceleration of the vehicle;
When the vehicle operating state detecting means detects deceleration of the vehicle, the vehicle generator control device comprising voltage control means for increasing the output voltage of the generator more than when not decelerating,
The power supply circuit is set to a first power supply state in which power is supplied from the first battery, the second battery, and a generator to the vehicle electrical load when the power supply circuit is turned on. A switch to be in a second power supply state in which power supply to the battery is cut off and only the second battery is supplied to the lamp,
Lighting detection means for detecting the lighting of the lamp,
When deceleration of the vehicle is detected by the vehicle operating state detection means when lighting of the lamp is detected by the lighting detection means, before the output voltage of the generator is increased by the voltage control means, The power supply control means for turning off the switch is provided.

    Therefore, when the vehicle is decelerated when the lighting device is lit, power supply from the generator to the lighting device and the second battery is cut off, and power is supplied to the lighting device only from the second battery. Even if the output voltage of the generator is increased, the brightness of the lamp is prevented from changing (increasing). On the other hand, even in that case, since the power is supplied from the generator to the first battery, the energy when the vehicle decelerates is recovered as the charging of the first battery proceeds.

The invention according to claim 2 is the invention according to claim 1,
In addition to the lighting device, the electric load for the vehicle includes an electric device in which power supply from the generator is cut off and power is supplied only from the second battery when the switch is off.
The power supply control means turns on the switch when the lighting of the lamp is not detected,
The voltage control means makes the output voltage of the generator when the deceleration of the vehicle is detected higher when the lighting of the lamp is detected than when it is not lit.

    That is, when high voltage power is supplied from the generator to the electrical device, the electrical device may be adversely affected (for example, a reduction in life). However, when the vehicle is decelerated when the lighter is lit, the switch is turned off, and the power supply from the generator is cut off to the electrical equipment. Absent.

    Therefore, in the present invention, the output voltage of the generator when the deceleration of the vehicle is detected is made higher when the lighting of the lamp is detected than when it is not lit. The energy recovery efficiency during deceleration is improved to improve fuel efficiency.

The invention according to claim 3 is the invention according to claim 1 or claim 2,
The power supply control means turns on the switch after the output voltage of the generator is lowered by the voltage control means when the vehicle deceleration is no longer detected when the lighting of the lamp is detected. It is characterized by.

    In other words, when the switch is turned on, a first power supply state in which power is supplied from the generator to the vehicle electrical load is entered. If the output voltage of the generator is high at this time, the brightness of the lamp will become strong. Therefore, by turning on the switch after the output voltage of the generator has been reduced by the voltage control means, it is possible to prevent the brightness of the lamp from fluctuating greatly when the vehicle transitions from the deceleration state to the non-deceleration state. It is what you do.

    In addition, if the switch is turned on while the generator output voltage is high, the voltage difference between the generator side and the second battery side is large, and thus the contact of the switch is likely to be worn. Later, the voltage difference between the generator side and the second battery side becomes small, which is advantageous for protection of the switch.

According to a fourth aspect of the present invention, in any one of the first to third aspects,
An engine automatic stop means for stopping the engine when a predetermined stop condition is satisfied during engine operation, and restarting the engine by a starting motor when the predetermined restart condition is satisfied after the engine is stopped;
The starter motor is connected to the power supply circuit so that power is supplied from the first battery when the switch is off,
The electrical load for cabin air conditioning is connected to the power supply circuit so that the power supply from the generator is cut off and the power is supplied only from the second battery when the switch is off,
The power supply control means turns off the switch when the engine is stopped by the engine automatic stop means, and turns on the switch after the engine is restarted.

    Therefore, when the engine is stopped, the switch is turned off, so that the electric power for the air conditioning for the passenger compartment is supplied only by the second battery. Is less burdensome and can be avoided. Therefore, the restartability of the engine performed using this first battery is improved.

    Thus, when the engine is stopped, the output voltage of the generator is zero, and the output voltage increases when the engine is restarted. Since the switch is turned on after the engine is restarted, the switch is adversely affected. Can be avoided. In other words, if the switch is turned on before the output voltage of the generator increases due to engine restart, the voltage difference between the generator side and the second battery side is large. After starting, the voltage difference between the generator side and the second battery side becomes small, which is advantageous for protection of the switch.

    As described above, according to the present invention, the first and second batteries connected in parallel are provided, a switch is provided in the power supply circuit to which the generator is connected, and when the vehicle is decelerated when the lighting device is turned on, Since the switch is turned off before the output voltage of the generator is increased, the power supply from the generator to the lamp and the second battery is cut off, and the lamp is supplied from only the second battery. Even if the output voltage of the generator is not gradually changed, it is possible to prevent the brightness of the lamp from fluctuating, which is advantageous for recovering energy when the vehicle is decelerated, and thus improving fuel consumption.

    Moreover, according to the above-mentioned switch that is turned on when the lamp is not lit and the output voltage of the generator when the vehicle is decelerated is higher than that when the lamp is lit, the electrical equipment is adversely affected. Without increasing the efficiency of energy recovery during vehicle deceleration, the fuel consumption is further improved.

    Further, when the vehicle shifts from the deceleration state to the non-deceleration state when the lamp is turned on, the switch is turned on after the output voltage of the generator is lowered. It is possible to prevent the brightness of the lamp from fluctuating greatly during the transition, and it is also advantageous for protecting the switch.

    In addition, an electric motor for starting the engine automatic stop means is connected to the power supply circuit so that power is supplied from the first battery when the switch is off, and an electric load for passenger compartment air conditioning is switched off. Sometimes connected to the power supply circuit so that power is supplied only from the second battery, the switch is turned off when the engine is stopped by the engine automatic stop means, and the switch is turned on after the engine is restarted. According to the above configuration, the use of the first battery with a small load on the electric load while the engine is stopped improves the restartability of the engine and is advantageous for protecting the switch.

    Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

    FIG. 1 schematically shows the overall configuration of a control device for a vehicular generator. In the figure, reference numeral 1 denotes a power supply circuit for supplying electric power to a vehicle electrical load such as a lighting device 2, which has a first battery 3 and a second battery 4 connected in parallel, and is further driven by an engine 5 as a belt. 3 and 4 and the generator 6 which supplies electric power to the vehicle electrical load are connected.

    The power supply circuit 1 is provided with a first relay switch 7 that cuts off the power supply from the generator 6 when the first battery 3 tends to be overcharged. Further, the power supply circuit 1 is cut off from the second battery 4, the lighting device 2, and the electric load not related to driving of the vehicle so as not to be supplied with power from the first battery 3 and the generator 6 according to the driving state of the vehicle. In addition, a second relay switch 8 is provided so that these electric loads are fed only from the second battery 4. The electric load not related to the driving of the vehicle is, for example, an electric device for cabin air conditioning, an audio, a television, a navigation device, or the like.

    On the other hand, the electric load related to the driving of the vehicle uses a key starter motor (starter) 11 for starting the engine 5 with the key switch 10, an automatic starter motor 12 for an engine automatic stop system described later, and a microcomputer. Control means 13 such as an engine. These are connected to the power supply circuit 1 so that power is supplied from the first battery 3 when the second relay switch 8 is OFF. The key starter motor 11 starts the engine 5 via a transmission gear, and the automatic starter motor 12 starts the engine 5 via a transmission belt.

    Further, the vehicle includes an engine automatic stop system. This is because the engine is stopped when a predetermined temporary stop condition is satisfied during engine operation, and the engine is restarted by the automatic starter motor 12 when the predetermined restart condition is satisfied after the engine is stopped. is there.

<About control means>
Next, the control means 13 will be described.

    The control means 13 functions as a control means for the engine automatic stop, voltage control means for controlling the output voltage of the generator 6 according to the driving state of the vehicle, the driving state of the vehicle, and lighting / non-lighting of the lamp 2 Accordingly, the relay switch 8 is turned on / off to act as a power supply control means for controlling the power supply state for the vehicle electrical load.

    For this purpose, the control means 13 is given a detection signal from the vehicle operating state detection means 14 and a detection signal from the lighting detection means (switch for turning on and off the lighting equipment 2) 15 of the lighting equipment 2. It is like that. Further, a voltage monitoring signal is supplied to the control means 13 from each positive electrode of the batteries 3 and 4, and a discharge current detection signal is supplied from the discharge current detector 16 connected to each negative electrode. Yes. On the other hand, a control signal is given from the control means 13 to the generator 6, the relay switches 7 and 8, and the automatic starter motor 12.

    The predetermined temporary stop condition of the engine automatic stop system is three conditions that the accelerator opening (or throttle opening) of the engine is fully closed, the vehicle is being braked, and the vehicle speed is zero. Is established together. In order to determine whether the stop condition is satisfied, an accelerator opening sensor, a brake sensor, and a vehicle speed sensor are provided as the vehicle operating state detection means 14. In addition, in order to make the restart of the engine smooth and reliable, it is desirable to add a condition that the charge amount of the first battery 3 is a predetermined value or more to the stop condition. The predetermined restart condition is that both conditions that the accelerator opening is equal to or greater than a predetermined value and the brake pedal is not depressed are both satisfied. The engine is stopped by cutting the fuel in all cylinders and stopping ignition.

    The voltage control means makes the output voltage of the generator 6 higher when the vehicle operating state detecting means 14 detects the deceleration of the vehicle than when the vehicle is not decelerated. In this case, the vehicle is decelerated when the accelerator opening is fully closed and the vehicle speed is equal to or higher than a predetermined value. Therefore, the driving state detection means for detecting deceleration of the vehicle speed can be constituted by an accelerator opening sensor and a vehicle speed sensor. Further, the voltage control means makes the output voltage of the generator 6 when the deceleration of the vehicle is detected higher when the lighting of the lamp 2 is detected than when it is not lit.

    Therefore, the output voltage of the generator 6 is “Low” (for example, 12.5 V) that is slightly higher than the battery voltage when the vehicle is not decelerated, and “Hi1” that is approximately 2 V higher than the battery voltage when the vehicle is decelerated and the lamp is lit. When the vehicle is decelerated and the lamp is not lit (for example, 14V), it is controlled to “Hi2” (for example, 13.5V) slightly lower than “Hi1”.

    On the other hand, the power supply control means turns on the second relay switch 8 when any of the following conditions A and B is satisfied during traveling of the vehicle based on the detection of the driving state detection means 14 and the lighting detection means 15. However, when either of the conditions C and D is satisfied, the second relay switch 8 is turned off.

    Condition A: No deceleration of the vehicle is detected (during non-deceleration, that is, during steady running and accelerated running).

    Condition B: Lighting of the lighting device 2 is not detected (when not lighting).

    Condition C: Deceleration of the vehicle was detected when lighting of the lamp 2 was detected.

    Condition D: The engine was automatically stopped by the engine automatic stop means.

    However, when the condition C is satisfied, the second relay switch 8 is turned off before the output voltage of the generator 6 is increased from “Low” to “Hi1” by the voltage control means, and the deceleration of the vehicle is not detected. When the output voltage of the generator 6 is lowered from “Hi1” to “Low”, the second relay switch 8 is turned on. Further, when the engine is restarted from the automatic stop state, the second relay switch 8 is turned on after the output voltage of the generator 6 becomes “Low” due to the restart.

    FIG. 2 shows the flow of the control. In step S1 after the start, the vehicle operating state and detection of the presence or absence of lighting of the lamp 2 are read, and in the subsequent step S2, it is determined whether or not the engine temporary stop condition is satisfied. When the temporary stop condition is satisfied, the routine proceeds to step S3, where fuel and ignition are cut, and at the subsequent step S4, the second relay switch 8 is turned off. In subsequent step S5, it is determined whether or not an engine restart condition is satisfied. If the engine restart condition is satisfied, the process proceeds to step S6, where the automatic starter motor 12 is driven and the engine is restarted. Then, after the output voltage of the generator 6 is controlled to “Low” in the subsequent step S7, the second relay switch 8 is turned on in the subsequent step S8.

    On the other hand, when it is determined in step S2 that the engine temporary stop condition is not satisfied, the process proceeds to step S9 and it is determined whether or not deceleration of the vehicle is detected. When deceleration is detected, the process proceeds to step S10 to determine whether or not the lighting device 2 is being lit. If it is lit, the process proceeds to step S11 and the second relay switch 8 is turned off. Then, the process proceeds to step S12 and the output voltage of the generator 6 is controlled to “Hi1”. When it is determined in step S10 that the lighting of the lighting device 2 is not detected, the process proceeds to step S13, the second relay switch 8 is turned on, and the output voltage of the generator 6 is controlled to “Hi2” in the subsequent step S14. Is done.

    If it is determined in step S9 that vehicle deceleration has not been detected, the process proceeds to step S15 and the output voltage of the generator 6 is controlled to "Low", and then the process proceeds to step S16 and the second relay switch. 8 is turned on.

    Therefore, as shown in the time chart of FIG. 3, if the lighting device 2 is lit when the vehicle shifts from the non-decelerating state to the decelerating state, the generator 6 is turned on after the second relay switch 8 is turned off. The output voltage is switched from “Low” to “Hi1”. That is, after the power supply from the generator 6 to the lamp 2 and the second battery 4 is cut off and the lamp 2 is fed from only the second battery 4, the output voltage of the generator 6 increases. . Therefore, this increase in output voltage has no effect on the lamp 2, and therefore the brightness of the lamp 2 does not fluctuate (become strong).

    Even in such a case, since the power is supplied from the generator 6 to the first battery 3, energy when the vehicle decelerates is recovered as the charging of the first battery 3 proceeds. The output voltage of the generator 6 at this time is a high “Hi1”. However, as described above, the second relay switch 8 is turned off, and high voltage power is supplied from the generator 6 to an electrical device such as an audio. There is no negative effect on those electrical equipment. Thus, since the output voltage of the generator 6 becomes a high “Hi1” in this way, the recovery efficiency of the deceleration energy is increased, which is advantageous for improving the fuel consumption.

    On the other hand, when the vehicle shifts from the non-decelerated state to the decelerated state, if the lighting device 2 is not lit, there is no problem of the brightness variation of the lighting device 2 even if the output voltage of the generator 6 increases. As indicated by a broken line in FIG. 3, the second relay switch 8 remains on. Therefore, in this case, power is also supplied from the generator 6 to electrical equipment such as audio. However, since the output voltage of the generator 6 is controlled to a lower “Hi2”, the power supply voltage to the electrical equipment is It will not be too high.

    Subsequently, when the vehicle is shifted from the deceleration state to the non-deceleration state in the state where the lighting device 2 is lit, the second relay switch 8 is switched after the output voltage of the generator 6 is switched from “Hi1” to “Low”. Is switched from off to on. With this switching from off to on, power is supplied from the generator 6 to the lamp 2, but since the output voltage of the generator 6 has been switched to “Low” before that, the brightness of the lamp 2 is increased. Does not fluctuate greatly. Further, the output voltage of the generator 6 is switched from “Hi1” to “Low”, and the second relay switch 4 is turned on in a state where the voltage difference between the generator 6 side and the second battery 4 side becomes small. Therefore, wear of the switch contacts and the like can be avoided, which is advantageous for protection of the switch 4.

    Next, after the vehicle shifts from the non-decelerated state to the decelerated state, when the engine temporary stop condition is satisfied, the output voltage of the generator 6 becomes zero accordingly, and the lighting device 2 is lit and when it is lit In both cases, the second relay switch 8 is turned off. Therefore, electric loads that are not related to driving of the vehicle, such as electric equipment for air conditioning, are supplied with power only from the second battery 4, and even if the engine pause time becomes longer, the first battery 3 is not consumed. It is done. Thus, when the engine restart condition is satisfied, the automatic starter motor 12 is supplied with power from the first battery 3 that is less consumed, so that the engine restartability is improved.

    When the engine is restarted, the output voltage of the generator 6 is increased from zero to “Low”, but then the second relay switch 8 is switched from OFF to ON, that is, the generator 6 side and the second Since the voltage is switched from off to on in a state where the voltage difference from the battery 3 side is small, it is advantageous for protection of the second relay switch 8.

    Note that an air conditioner blower motor as an electric load for a vehicle gives an uncomfortable feeling to the occupant when the air volume changes due to fluctuations in the generator output voltage. Therefore, even with respect to an electric load that makes the passenger feel uncomfortable under the influence of such fluctuations in the output voltage of the generator or feels that the performance is poor, the vehicle is decelerated while it is operating. In the same manner as in the case of the lighting device 2, the second relay switch 8 may be turned off before the generator output voltage is increased.

It is a figure which shows the structure of the control apparatus of the generator for vehicles which concerns on this invention. It is a flowchart of control of the apparatus. It is a time chart regarding the control.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric power feeding circuit 2 Lighting device 3 1st battery 4 2nd battery 5 Engine 6 Generator 8 2nd relay switch 12 Electric motor 15 for automatic start 15 Lighting detection means

Claims (4)

A power supply circuit having a first battery and a second battery connected in parallel, and supplying power to a vehicle electrical load including a lighting device;
A generator driven by the engine and connected to the power supply circuit to supply power to the first battery, the second battery and the vehicle electrical load;
Vehicle operating state detecting means for detecting deceleration of the vehicle;
In the vehicle generator control device comprising:
The power supply circuit is set to a first power supply state in which power is supplied from the first battery, the second battery, and a generator to the vehicle electrical load when the power supply circuit is turned on. A switch to be in a second power supply state in which power supply to the battery is cut off and only the second battery is supplied to the lamp,
Lighting detection means for detecting the lighting of the lamp,
When deceleration of the vehicle is detected by the vehicle operating state detection means when lighting of the lamp is detected by the lighting detection means, before the output voltage of the generator is increased by the voltage control means, A control device for a vehicular generator, comprising power supply control means for turning off the switch. In claim 1,
In addition to the lighting device, the electric load for the vehicle includes an electric device in which power supply from the generator is cut off and power is supplied only from the second battery when the switch is off.
The power supply control means turns on the switch when lighting of the lamp is not detected,
The voltage control means makes the output voltage of the generator when the deceleration of the vehicle is detected higher when the lighting of the lamp is detected than when it is not lit. Generator control device. In claim 1 or claim 2,
The power supply control means turns on the switch after the output voltage of the generator is lowered by the voltage control means when the vehicle deceleration is no longer detected when the lighting of the lamp is detected. A control device for a vehicle generator. In any one of Claim 1 thru | or 3,
An engine automatic stop means for stopping the engine when a predetermined stop condition is satisfied during engine operation, and restarting the engine by a starting motor when the predetermined restart condition is satisfied after the engine is stopped;
The starter motor is connected to the power supply circuit so that power is supplied from the first battery when the switch is off,
The electrical load for cabin air conditioning is connected to the power supply circuit so that the power supply from the generator is cut off and the power is supplied only from the second battery when the switch is off,
The vehicle power generator control device, wherein the power supply control means turns off the switch when the engine is stopped by the engine automatic stop means, and turns on the switch after the engine is restarted.

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