JP2011132887A - Vehicular power supply stabilizing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular power supply stabilizing device capable of replenishing an increase of electric power required in high speed rotation of a vehicular engine and in a rapid load change. <P>SOLUTION: The vehicular power supply stabilizing device includes a rectifier diode connected with a negative electrode side of various electric load devices having coils, such as an injector, an igniter and an alternator of a mounted engine, and a plurality of electrolytic capacitors connected in parallel between the positive electrode and the negative electrode of a battery, and is set so that counter-electromotive force generated from the coils of the various electric load devices when high speed rotation of the engine and when a rapid load change is returned to the positive electrode of the battery via the electrolytic capacitors by the rectifier diode. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power supply stabilization device for a vehicle that compensates for a power shortage that occurs when an on-board engine rotates at a high speed or a sudden load change occurs.

  A voltage stabilization circuit in which one or a plurality of parallel electrolytic capacitors are inserted and connected between a positive electrode and a negative electrode in a vehicle-mounted battery is described in JP-A-2004-9936, JP-A-2004-239115, and the like. It is well known in the art.

JP 2004-9936 A JP 2004-239115 A

  However, in the voltage stabilization circuit disclosed in Patent Documents 1 and 2, between the battery and an electrical load device (various electrical components such as an air conditioner, an audio device, and a car navigation device) driven by a current from now on, Only an electrolytic capacitor is interposed, and the storage function of the electrolytic capacitor is merely used as a spare battery.

  For example, when the accelerator is fully opened to start the vehicle suddenly, the engine speed increases and the battery potential drops instantaneously. At that time, the power demanded by the vehicle is insufficient. This becomes conspicuous due to deterioration of the battery.

  In addition, various devices having an injector, an igniter, an alternator, and other coils (including a solenoid valve) that serve as an electric load of the battery have an inductance component (inductive load). Back electromotive force and noise due to this are generated at the time of rotation or sudden load fluctuation, but it is possible to suppress the back electromotive force or absorb noise by the voltage stabilization circuit of Patent Documents 1 and 2 above. It is impossible and may cause malfunction of the various electric load devices.

  Furthermore, a method of connecting both poles of the injector coil as shown in FIG. 11 by a free wheel diode and releasing (short-circuiting) the back electromotive force to the positive electrode side is also known. Therefore, the back electromotive force cannot be used positively as replenishment of power required by the vehicle.

  The present invention aims to improve such a problem, and in order to achieve the object, the present invention is connected to the negative electrode side of various electric load devices having an injector, an igniter, an alternator and other coils of the mounted engine. A rectifier diode,

  A plurality of electrolytic capacitors connected in parallel between the positive electrode and the negative electrode of the battery;

  The counter electromotive force generated from the coils of various electric load devices during high-speed rotation of the engine or sudden load fluctuation is returned to the positive electrode of the battery via the electrolytic capacitor by the rectifier diode.

  Further, in claim 2, a mounting fixing member of various electric load devices having an injector, an igniter, an alternator, and other coils of the mounted engine, or a rectifying diode grounded to the engine body,

  A plurality of electrolytic capacitors connected in parallel between the positive electrode and the negative electrode of the battery;

  The counter electromotive force generated from the coils of various electric load devices during high-speed rotation of the engine or sudden load fluctuation is returned to the positive electrode of the battery via the electrolytic capacitor by the rectifier diode.

  In claim 3, in addition to being connected to the negative side of various electric load devices having an injector, an igniter, an alternator, and other coils of the mounted engine, a rectifier diode grounded to the engine body;

  A plurality of electrolytic capacitors connected in parallel between the positive electrode and the negative electrode of the battery;

  The counter electromotive force generated from the coils of various electric load devices during high-speed rotation of the engine or sudden load fluctuation is returned to the positive electrode of the battery via the electrolytic capacitor by the rectifier diode.

  Further, the present invention is characterized in that a plurality of rectifier diodes are arranged in parallel, and the capacitance of the electrolytic capacitor is changed differently.

  According to the said structure of Claim 1, the rectifier diode connected to the negative electrode side of the various electric load apparatuses which have a coil, and the some electrolytic capacitor connected in parallel between the positive electrode and negative electrode in a battery are provided. The back electromotive force generated from the coil (inductance component) of the electric load device during high-speed rotation of the engine or sudden load fluctuation is returned to the positive electrode of the battery via the electrolytic capacitor by the rectifier diode. The back electromotive force stored as surplus power in the electrolytic capacitor can be positively replenished by itself to the electric load device as the power required by the vehicle at the time of high speed rotation or sudden load fluctuation, As a result, the operation of various electric load devices is stabilized, and there is no possibility of malfunction.

  For example, the ignition spark noise due to the secondary voltage of the igniter that is the electric load device is the strongest among the vehicles, and this noise propagates through the engine body (body) and is eventually absorbed by the battery. Since the capacitor element employed in claim 1 has a better ability to absorb electric energy than a battery, it efficiently absorbs the noise, and thus acts on audio speakers, radio, and other electric systems of the entire vehicle. This is effective in reducing noise.

  Furthermore, compared to about 24 hours for normal charging of a vehicle-mounted battery and several hours for rapid charging, the capacitor can be charged within tens of milliseconds. Therefore, the electric power required by the vehicle can be replenished promptly.

  Such various effects can be achieved in substantially the same manner even if the configurations of claims 2 and 3 are adopted.

  In any one of claims 1 to 3, if the configuration of claim 4 is adopted, the load received by itself can be reduced (shared) as a plurality of rectifier diodes in parallel, and a plurality of There is an effect that the discharge current can be smoothed by changing the capacity of the electrolytic capacitor to be different.

1 is a perspective view showing a power supply stabilizing device for a vehicle according to the present invention. It is sectional drawing which follows the 2-2 line of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. It is a top view which extracts and shows an electric circuit board. It is an electric circuit diagram of a basic embodiment according to the present invention. It is an electric circuit diagram of the 1st modification concerning the present invention. It is an electric circuit diagram of the 2nd modification concerning the present invention. It is an electric circuit diagram of the 3rd modification concerning the present invention. It is the wave form diagram of the voltage experimented using the electric circuit without a rectifier diode. FIG. 10 is a waveform diagram of a voltage experimented using an electric circuit with the rectifier diode of the present invention, and corresponds to FIG. 9. It is the conventional electric circuit diagram using a freewheel diode.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIGS. 1 to 5 show a power supply stabilizing device (A) of an automobile and its electric circuit, and (10) shows a voltage of an onboard battery (11). Is a casing for housing the electric circuit board (12), which is made of a light metal material such as aluminum or a hard synthetic resin material. (13) is an open / close lid attached to the casing (10) with screws (14), and (15) is a screw hole for attaching and fixing the casing (10) to the vicinity of the battery (11). The casing (10) may be attached and fixed in the engine room of an automobile using a double-sided adhesive tape instead of a fixing screw.

  (16a), (16b) and (17) are first to third cables led out from the electric circuit board (12) through the opening / closing lid (13) of the casing (10). The connection terminals of the cables (16a) and (16b) are connected to the positive electrode (11a) and the negative electrode (11b) of the battery (11), while the remaining third cable (17) is used as a ground wire and the engine body (not shown) ) To the fixed metal member (P) such as a bolt for attaching various electric load devices (18) having injectors, igniters, alternators, audio speakers, and other coils (including solenoid valves).

  (C1), (C2), (C3), and (C4) are a plurality of electrolytic capacitors having different capacities (a total of four in the illustrated example), and between the positive electrode (11a) and the negative electrode (11b) in the battery (11). Are connected in parallel to store the back electromotive force from the electric load device (18), and the increase in power required at the time of high-speed rotation of the engine or sudden load fluctuation is discharged from the electrolytic capacitor element. Compensate by current and stabilize supply power. In that case, the combination of electrolytic capacitors (C1) to (C4) having different capacities is useful for smoothing the discharged current as a use of different discharge cycles.

  Further, (D1) and (D2) are a plurality of diodes connected in parallel to rectify the input current to the electrolytic capacitors (C1) to (C4), and the inductances of various electric load devices (18) having the coils. The back electromotive force generated from the component and the noise due to this are once absorbed, and the back electromotive force is regenerated as surplus power to the positive electrode (11a) of the battery (11) so that the engine can be rotated at high speed or sudden load fluctuation. The power required at times is replenished to prevent malfunctions and other unstable operations of the various electric load devices (18) that are likely to occur at that time.

  However, there may be only one rectifier diode (D1) (D2), and as a low-pass filter between the rectifier diodes (D1) (D2) and the electrolytic capacitors (C1) to (C4). The noise absorbing effect may be improved by interposing one or a plurality of working resistors (not shown).

  (19) is a fuse, and if it is short-circuited due to a failure of the electrolytic capacitors (C1) to (C4) or the rectifier diodes (D1) and (D2), it is blown by receiving a large current flowing from the battery (11). It is like that. In order to confirm that the power supply stabilizing device (A) is operating normally, a light emitting diode (LED) (20) may be installed.

  Next, FIG. 6 shows an electric circuit of a power supply stabilizer (A) incorporated in a four-cylinder automobile engine as a first modified embodiment of the present invention corresponding to FIG. 5. Without grounding the third cable (17) of the power supply stabilizing device (A) to the engine body (body), as the electric load device (18) of the battery (11), to the negative electrode side of the same plural parallel injectors, It is connected directly with new electrical wiring. (21) is a rectifier diode interposed in the middle of the connection wiring.

  FIG. 7 also shows a second modified embodiment of the present invention. In this embodiment, the third cable (17) of the basic embodiment shown in FIGS. 1 to 5 is branched to provide an electric load device (injector). In addition to connecting and wiring to the negative electrode side of (18), the electric load device (18) is earthed to a fixed metal member (P) such as a bolt or the engine main body (body) that is attached to the engine main body. A rectifier diode (21) is also present along the ground wire.

  Further, FIG. 8 shows a third modified embodiment of the present invention, in which an injector, an igniter, an alternator, and other electric load devices (18a) (18b) (18c) (18d) different from each other are used. In addition to the direct connection to the negative electrode side using new electrical wiring, a fixed metal member such as a bolt for attaching various electric load devices (18a) to (18d) to the engine body ( P) or earthing the engine body itself.

  6 to 8, a plurality of electrolytic capacitors (C1) (C2) (C3) having different capacities are arranged in parallel between the positive electrode (11a) and the negative electrode (11b) of the battery (11). There is no change in being connected. Therefore, only the corresponding reference numerals to FIGS. 1 to 5 are written in FIGS. 6 to 8, and detailed description of the first to third modified embodiments is omitted. In the illustrated embodiment, a gasoline engine of an automobile is described as an object. However, the present invention can of course be applied to a diesel engine or a motorcycle.

  In order to confirm the effect of the present invention, FIGS. 9 and 10 use an automobile battery (11) having a power supply voltage of 12V, operate the injector coil of the electric load device (18) with a signal of 5V, and use a negative electrode in the coil. 9 is a waveform as a result of measuring the voltage on the side of 10/1000 seconds. When the rectifier diode is not provided in the electric circuit, the back electromotive force indicated by the part (t1) in FIG. On the other hand, in the electric circuit having the rectifier diodes (D1) and (D2) of the present invention, the back electromotive force of the diodes (D1) and (D2) is evident from the reference numeral (t2) in FIG. The back electromotive force is reduced to about 12V to 13V due to the function of releasing.

  In general, it is said that the back electromotive force is 5 to 10 times the operating voltage of the injector coil, and the time is about 0.3 milliseconds from the generation to the convergence. If the engine is a four-cycle engine rotating at an operating voltage of 12 V and 6000 rpm, 3000 fuel injections are performed per minute per cylinder, and 3000 counter electromotive forces are generated. If it is a 4-cylinder engine, it will be 12,000 times, which is 4 times this, and if it is a 6-cylinder engine, it will also be 6 times, 18000 times. If it is 0.3 milliseconds × 18000 times, it can be said that a voltage of 60 V is generated for 5 seconds or more, and the counter electromotive force can be sufficiently used as auxiliary power.

  In this regard, according to the power supply stabilizing device (A) of the present invention, a plurality of electrolytic capacitors (C1) to (C4) are connected in parallel between the positive electrode (11a) and the negative electrode (11b) of the battery (11). In addition, the back electromotive force generated from the inductance component of various electric load devices (18) having the above-described injector, alternator, igniter, and other coils is used as surplus power, so to speak, as the surplus power of the battery (DC supply source) (11). Returning to the positive electrode (11a) (since the counter electromotive force is higher voltage, the current flows to the battery side having a lower voltage.) Since the rectifier diodes (D1) and (D2) are also provided, the engine is rotated at high speed. The increase in electric power required by the various electric load devices (18) at the time of a sudden load change is positively transmitted from the capacitors (C1) to (C4) to the various electric load devices (18). It is possible to supply its own Dzuto.

  As a result, there is no possibility that the various electric load devices (18) will malfunction or become unstable when the engine rotates at a high speed or when a sudden load change occurs. Excellent responsiveness in replenishment.

  In particular, as is apparent from the first to third modified embodiments of FIGS. 6 to 8, a plurality of electric load devices (18a) to (18d) that are the same or different from each other circulate the surplus power of the present invention. In other words, as a common common rail, it branches from the parallel state, so that the stability and responsiveness of power supply to all the electric load devices (18a) to (18d) are remarkably improved.

  Further, as shown in the second and third modified embodiments of FIGS. 7 and 8, the rectifier diodes (D1) and (D2) are connected to the negative electrode side of the various electric load devices (18), and at the same time, the engine body (body) or this If earthing to the mounting and fixing member (P) of various electric load devices (18) against the above, not only the effect of releasing the back electromotive force but also the effect of absorbing noise generated from the alternator and strong noise of ignition spark, etc. .

(10) · Casing (11) · Battery (11a) · Positive electrode (11b) · Negative electrode (12) · Electric circuit board (13) · Opening and closing lid (14) · Screw (15) · Screw hole (16a) · First Cable (16b), second cable (17), third cable (18) (18a) (18b) (18c) (18d), electrical load device (19), fuse (20), light emitting diode (LED)
(A) ・ Power supply stabilizer (C1) (C2) (C3) (C4) ・ Electrolytic capacitor (D1) (D2) (21) ・ Rectifier diode (P) ・ Fixed metal member (ground part)

Claims (4)

A rectifier diode connected to the negative side of various electric load devices having an injector, an igniter, an alternator, and other coils of the mounted engine;
A plurality of electrolytic capacitors connected in parallel between the positive electrode and the negative electrode of the battery;
Stabilizing the power supply of a vehicle, wherein back electromotive force generated from coils of various electric load devices during high-speed rotation of the engine or sudden load fluctuation is returned to the positive electrode of the battery via the electrolytic capacitor by the rectifier diode apparatus. A mounting rectifying diode grounded on the mounting body of the various electric load devices having an injector, an igniter, an alternator, and other coils of the mounted engine, or the engine body,
A plurality of electrolytic capacitors connected in parallel between the positive electrode and the negative electrode of the battery;
Stabilizing the power supply of a vehicle, wherein back electromotive force generated from coils of various electric load devices during high-speed rotation of the engine or sudden load fluctuation is returned to the positive electrode of the battery via the electrolytic capacitor by the rectifier diode apparatus. In addition to being connected to the negative side of various electric load devices with injectors, igniters, alternators, and other coils of the mounted engine, rectifier diodes that are also grounded to the engine body,
A plurality of electrolytic capacitors connected in parallel between the positive electrode and the negative electrode of the battery;
Stabilizing the power supply of a vehicle, wherein back electromotive force generated from coils of various electric load devices during high-speed rotation of the engine or sudden load fluctuation is returned to the positive electrode of the battery via the electrolytic capacitor by the rectifier diode apparatus.   4. The vehicle power supply stabilization device according to claim 1, wherein a plurality of rectifier diodes are arranged in parallel, and the capacitance of the electrolytic capacitor is changed differently.

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