JPH06280607A - Power source for driving accessory of internal combustion engine - Google Patents

Abstract

PURPOSE:To drive a fuel pump and an exhaust characteristic regulating valve for a fuel injection device. CONSTITUTION:An accessory drive generator coil 4a which are common to a pump motor 7A and an exhaust characteristic regulating valve 12 is in a magnetic generator 4 driven by an internal combustion engine. Further, a drive power supply circuit 17 serves as a power source for feeding drive power to the pump motor 7A and the actuator 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary machine provided in an internal combustion engine, a motor for driving a fuel pump for supplying fuel to an injector, and an actuator for driving an exhaust valve for adjusting a resonance frequency of an exhaust system. The present invention relates to a power supply device for driving an auxiliary machine of an internal combustion engine, which supplies drive power to the engine.

[0002]

2. Description of the Related Art In this specification, an auxiliary machine of an internal combustion engine means various equipment attached to the engine for operating the internal combustion engine.

Recently, in order to improve the performance of an internal combustion engine, an electric type is often used as an auxiliary machine of the engine. For example, in recent internal combustion engines, a fuel injection device is often used as a means for supplying fuel. In that case, an electric injector, a fuel pump for supplying fuel to the injector, and the fuel pump are driven. Requires a pump motor (electric motor).

Further, in order to improve the high speed performance of the engine, an exhaust valve for adjusting the resonance frequency of the exhaust system is provided, and the exhaust valve is adjusted at the time of high speed of the engine to cause resonance in the exhaust system so as to improve the exhaust efficiency and supply. Gas efficiency has been improved, but this requires an electric actuator to drive the exhaust valve.

Further, the gasoline engine requires an ignition device and an electronic device such as a microcomputer for controlling the ignition timing and the fuel injection timing.

Conventionally, the fuel injection device and the exhaust valve have been used mainly for internal combustion engines such as vehicles equipped with a battery, but recently, even in vehicles without a battery, the performance of the engine has been improved. In order to improve the fuel consumption, it has been considered to use a fuel injection device, an exhaust valve, or an electronic device such as a microcomputer.

Therefore, in order to enable the fuel injection device to be used in an internal combustion engine of a vehicle or the like which is not equipped with a battery,
It has been proposed to provide a generator coil for driving a pump in a magnet generator attached to an engine, and drive the pump motor with the generator coil for driving the pump.

Further, it is noted that only half cycle output of the ignition power supply coil provided in the magnet generator is used to supply the ignition energy, and it is not used to supply the ignition coil of the ignition power supply coil. Attempts have been made to construct a DC power supply using the output of a half cycle, and to drive an injector or an electronic device such as a microcomputer with the output of this DC power supply.

[0009]

In order to provide an exhaust valve in an engine such as a vehicle not equipped with a battery, a magneto coil installed in the engine is provided with a magneto coil for driving the exhaust valve. Therefore, it is possible to supply electric power to the actuator for driving the exhaust valve.

However, since the magnet generator also needs to supply electric power to the lighting load and the like, when the ignition power coil and the pump driving power coil are already provided in the magnet generator, the exhaust valve is further exhausted. It is often difficult to provide a power generating coil for driving. If an attempt is made to provide a generator coil for driving the exhaust valve, the size of the magnet generator becomes large, the cost becomes high, and the size of the engine becomes large.

An object of the present invention is to provide an internal combustion engine capable of driving both a fuel injection device and an exhaust valve when a battery is not mounted, without specially providing a generator coil dedicated to the exhaust valve. It is to provide a power supply device for driving an auxiliary machine of an engine.

[0012]

SUMMARY OF THE INVENTION The present invention drives a pump motor for driving a fuel pump for supplying fuel to an injector and an exhaust valve for adjusting a resonance frequency of an exhaust system, among auxiliary equipments provided in an internal combustion engine. The present invention relates to a power supply device for driving an auxiliary machine of an internal combustion engine, which supplies electric power to an electric actuator.

According to another aspect of the present invention, a magneto-generator driven by an internal combustion engine is provided with a generator coil for driving an auxiliary machine, which is common to both the pump motor and the actuator. A drive power supply circuit that supplies drive power to the pump motor and the actuator by using the power generation coil as a power source is provided.

According to a second aspect of the present invention, in the drive power supply circuit, a pump drive switch for turning on / off the drive current of the pump motor, an actuator drive switch for turning on / off the drive current of the actuator, a pump drive switch and an actuator drive. And a switch control device for electrically connecting the switches with different duty ratios.

[0015]

When the fuel is supplied to the engine by the injector, the system for supplying the fuel from the electric pump to the injector so that the fuel supply amount is determined by the time for opening the valve of the injector (the time for giving the injection command to the injector). A pressure regulator is provided in the to maintain the pressure (fuel pressure) of the fuel supplied to the injector constant.

The discharge amount of the fuel pump driven by the motor is substantially proportional to the driving torque of the motor, and the driving torque of the motor is proportional to the driving current of the motor. While the engine speed is low and the magneto generator output is low, the discharge pressure of the pump does not reach the value required to maintain the rated value of fuel pressure (adjusted by the pressure regulator). Drive current increases with an increase in rotation speed.
When the engine speed exceeds the set value, the pump discharge pressure tries to exceed the rated value of the fuel pressure, but the fuel pressure is kept at the rated value by the pressure regulator, so the pump discharge pressure is kept at a constant value. , The drive current of the motor is limited to a constant value. Therefore, in the middle and high speed regions of the engine, the output of the power generation coil becomes redundant, and the excess output is discarded.

On the other hand, in most cases, the exhaust valve provided in the exhaust system is operated only when the engine is operating at high speed. Therefore, it is sufficient that drive power can be supplied to the actuator when the engine is operating at high speed.

Therefore, as in the present invention, the auxiliary machine driving power generation coil is commonly provided for both the pump motor and the actuator, and the auxiliary machine driving power generation coil drives the pump motor and the actuator. In this case, in the low speed region where it is not necessary to drive the exhaust valve, the output of the auxiliary device driving power generation coil is used exclusively for driving the pump motor, and the pump motor can be operated without any trouble. Further, in the high speed region of the engine in which the output of the generator coil has a sufficient margin, the drive power can be supplied to the exhaust valve drive actuator without sacrificing the drive power of the pump motor.

As described above, according to the present invention, since the pump motor and the actuator for driving the exhaust valve are driven by the common generator coil, both the fuel pump and the exhaust valve are driven by using a small magnet generator. It can be driven without trouble, and even if the battery is not installed, the performance of the engine can be improved by using the fuel injection device and the exhaust valve without using a large-sized magnet generator.

In particular, as in the invention described in claim 2,
When a pump drive switch for turning on / off the drive current of the pump motor and an actuator drive switch for turning on / off the drive current of the actuator are provided, and the pump drive switch and the actuator drive switch are controlled to conduct at different duty ratios, the auxiliary machine Since the output of the drive generator coil can be appropriately distributed to the pump motor and the actuator, the exhaust valve can be operated without impairing the operation of the pump motor even in a region where the rotation speed is relatively low.

[0021]

1 shows the overall construction of an embodiment of the present invention, in which 1 is an internal combustion engine having an intake pipe 2 and an exhaust pipe 3, and 4 is attached to an output shaft 1a of the internal combustion engine 1. It is a magnet generator composed of a magnet rotor 4A and a stator 4B attached to the case of the engine.

A throttle valve 5 is mounted on the inlet side of the intake pipe 2, and an injector 6 is mounted so as to inject fuel into a space in the intake pipe downstream of the throttle valve 5. The injector 6 includes a valve that opens and closes an injection port and an electromagnet that operates the valve. The injector 6 is excited to open the valve while the injection command signal is given.

A fuel pump 7 is composed of a pump motor (electric motor) 7A and a pump 7B driven by the motor. The suction port of the pump 7B is connected to a fuel tank 9 through a pipe 8.
The discharge port of the pump 7B is connected to the fuel supply port of the injector 6 via the pipe 10.

Reference numeral 11 denotes a pressure regulator connected between the fuel supply port of the injector 6 and the fuel tank 9, and this pressure regulator has a set value for the pressure of the fuel supplied to the fuel supply port of the injector 6. By returning a part of the fuel to the fuel tank 9 when it exceeds, the pressure (fuel pressure) of the fuel supplied to the injector 6 is kept constant.

When the injection command signal is given to the injector 6, the valve of the injector 6 opens, so that the fuel is injected from the injection port into the intake pipe 2. The amount of fuel given to the engine is determined by the fuel pressure and the injection time. The time for giving the injection command signal to the injector 6 is controlled so that the mixed gas having the optimum air-fuel ratio is given into the cylinder of the engine at each engine speed.

The exhaust pipe 3 is provided with a cavity 3A, and an exhaust valve 12 is provided so as to change the opening cross-sectional area of the pipeline on the upstream side of the cavity 3A. The exhaust valve 12 of the present embodiment enters and exits the exhaust pipe 3 from a direction perpendicular to the axial direction of the exhaust pipe 3.
The exhaust valve includes a rack 13 connected to the exhaust valve and a pinion 14 meshed with the rack.
And an electric motor 15 that drives the pinion 14 to rotate.

The exhaust valve 12 need not be a linear displacement type, but may be a rotary type.

The exhaust valve 12 is provided to cause resonance in a cavity provided in the exhaust system at a high speed of the engine to enhance exhaust efficiency of the engine, and its opening degree at each rotational speed at a high speed. Is operated by the actuator 16 so as to have an optimum size. FIG. 9 shows an example of a change in the operating angle θ of the actuator 16 for operating the exhaust valve with respect to the rotation speed N. In the example shown by the solid line in FIG. 9, a region of the set rotation speed Ns (> N2) or more Then, a drive current is applied to the actuator 16 to change the operating angle θ of the actuator from 0 to θ4 (0 <θ1 <θ2 <θ3 <θ4). In the example shown in FIG. 9, when the operating angle of the actuator is 0, the opening of the exhaust valve is in the minimum state, and the opening of the exhaust valve increases as the operating angle of the actuator increases. By adjusting the opening of the exhaust valve in the region of the set rotational speed Ns or higher, resonance is generated in the exhaust pipe and the amount of gas flowing into the exhaust pipe is increased, thereby increasing intake efficiency and increasing engine output. Is improving.

At each rotation speed, a position sensor for detecting the position of the exhaust valve is provided to control the opening of the exhaust valve to match the target opening, and the position of the exhaust valve detected by the position sensor is provided. The actuator 16 is controlled so as to match with the target position.

In the present invention, the auxiliary generator driving power generation coil 4a common to the pump motor 7A and the actuator 16 is provided in the magnet generator 4, and the output of the auxiliary machinery driving power generation coil 4a is the driving power. It is supplied to the pump motor 7A and the actuator 16 via the supply circuit 17.

An ignition power supply coil for supplying ignition energy to the ignition device of the engine is provided outside the power generation coil 4a in the magnet generator 4, and further a power generation coil for driving a lighting load or the like as required. Is provided. The ignition power supply coil induces an AC voltage in synchronization with the rotation of the engine. Normally, only the positive half-cycle output of the ignition power supply coil is used to supply ignition energy to the ignition device, so a power supply circuit for generating a constant DC voltage is constructed using the negative half-cycle output. It This power supply circuit is composed of, for example, a power supply capacitor charged by the output of the negative half cycle of the ignition power supply coil, and a control circuit for maintaining the voltage across the power supply capacitor at a constant value. This power circuit
In addition to being used as a power source for a control circuit or a microcomputer for controlling ignition timing or fuel injection timing, it is also used as a power source for giving an injection command signal to the injector 6.

FIG. 2 shows an example of the structure of the driving power supply circuit 17. In this example, a full-wave rectifier 18 for rectifying the output of the auxiliary machine driving generator coil 4a and an output terminal of the rectifier 18 are connected. The smoothing power supply capacitor 19 and the voltage regulator 20 for controlling the voltage across the capacitor 19 so as to limit the voltage across the capacitor 19 to the rated voltage V1 or less of the pump motor. The DC voltage obtained across the capacitor 19 is the pump motor. 7A and the actuator 16.

The voltage regulator 20 short-circuits the generator coil 4a to reduce the output voltage of the generator coil 4a when the voltage across the capacitor 19 exceeds the rated value, and the capacitor 1
When the voltage across 9 goes below the rated value, the generator coil 4
It is composed of a circuit for recovering the output voltage of the generator coil 4a by canceling the short circuit of a, and controls the output voltage of the generator coil 4a so as to limit the voltage across the capacitor 19 to a rated value or less.

The output characteristic of the magnet generator 4 is, for example, as shown by the curves N1 to N4 in FIG. Curves N1 to N in FIG.
4 is the engine speed N1 to N4 (N1 <N2 <
It shows the characteristics of output voltage V vs. load current I when N3 <N4). A straight line L in FIG. 8 is the load characteristic of the pump motor. In FIG. 8, I1 is the rated current of the pump motor determined by the adjustment value by the pressure regulator 11. When the drive current of the pump motor reaches the rated current I1, the discharge pressure of the pump reaches the adjustment value of the pressure regulator. .

The drive current of the pump motor 7A increases as the rotation speed N increases, as indicated by the curve a in FIG. In FIG. 10, the curve B shows the load current-rotational speed characteristic when the auxiliary machine driving generator coil 4a generates the rated voltage V1 of the pump motor.

When the number of revolutions exceeds N1, the drive current of the pump motor can reach the rated current I1. When the drive current of the pump motor exceeds the rated value I1,
The discharge pressure of the pump tends to overcome the pressure adjustment value of the pressure regulator, but when the discharge pressure of the pump exceeds the adjustment value of the pressure regulator, the pressure regulator adjusts the pressure and the discharge pressure of the pump Since it is decreased, the load torque of the pump motor eventually becomes constant, and the drive current is kept at the rated current I1 even if the rotation speed increases. The voltage applied to the pump motor increases as the rotation speed increases, and when the rotation speed reaches N2, the applied voltage of the pump motor reaches the rated voltage V1. If the voltage regulator 20 is not provided, the voltage applied to the pump motor becomes V2 (see FIG. 8) when the rotation speed rises to N4.

In this embodiment, the generator coil 4 is arranged so that the voltage across the power supply capacitor 19 is limited to the rated value V1 or less.
Since the voltage regulator 20 that adjusts the output voltage of a is provided, the applied voltage of the pump motor is maintained at V1. When the voltage is limited to V1 and the rotational speed rises to N4, the current I2 can flow from the magneto coil 4a to the load as shown in FIG. 8, but in reality, the pressure regulator 11 is provided. Due to this, the drive current of the pump motor is limited to the rated value I1. Therefore, when the generator coil 4a uses only the pump motor as a load, when the engine speed increases to N4, V1 x The electric power of (I2-I1) is wasted and wasted by the voltage regulator 20. When the generator coil 4a uses only the pump motor 7A as a load, it is possible to supply the current in the shaded range in FIG. 10 to other loads in the medium-high speed rotation region where the engine speed exceeds N2.

In the present invention, the actuator 16 is utilized by utilizing the surplus electric power generated in the region exceeding the rotation speed N2.
To drive the pump motor 7A and actuator 1
6 and 6 can be driven by a common auxiliary machine driving generator coil 4a.

FIG. 3 shows another embodiment of the present invention. In this embodiment, a switch circuit for selectively supplying the current given from the generator coil 4a through the rectifier 18 to the pump motor 7A and the actuator 16. 21 and a switch control means 22 for controlling the switch circuit 21 are provided. The switch circuit 21 includes a pump drive switch 21A for turning on and off a drive current of the pump motor,
An actuator drive switch 21B for turning on and off the drive current of the actuator is provided, and the switch control means 22 sets the pump drive switch 21A and the actuator drive switch 21B to different duty ratios D.
Control is performed so that p and Da are alternately conducted.

The duty ratio D is D when the ON period of the switch means is Ton and the OFF period is Toff.
= Ton / (Ton + Toff) and Dp + Da = 1
Have a relationship.

With this structure, the output of the auxiliary machine driving power generation coil 4a is supplied to the pump motor 7A and the actuator 1.
6, the actuator 16 can be operated without impairing the operation of the pump motor 7A even in a region where the rotation speed is relatively low, as shown by the broken line in FIG. It is also possible to start the operation of the actuator 16 at a set rotational speed Ns' lower than the rotational speed N2 at which the voltage applied to the pump motor reaches the rated value V1.

An embodiment in which each part of FIG. 3 is concretely shown is shown in FIG. In the switch circuit 21 of the embodiment shown in FIG. 4, the transistors Tr1 and Tr2 and the resistors R1 and R2 constitute a pump drive switch 21A, and the transistors Tr3 to Tr5 and the resistors R3 to R5 constitute an actuator drive switch 21B. Has been done. Reference numeral 21a is a control terminal of the switch circuit. When a high-level trigger signal is applied to this control terminal, the transistors Tr2 and Tr5 are turned on and the transistor Tr4 is turned off. At this time, the transistor Tr1 is turned on and the transistor Tr3 is turned off, so that the pump motor 7 passes through the transistor Tr1.
A drive current is supplied to A.

When the trigger signal is removed from the control terminal 21a and the potential of the control terminal becomes low level, the transistors Tr2 and Tr5 are turned off and the transistor T is turned off.
r4 becomes conductive. At this time, the transistor Tr1 is turned off, the transistor Tr3 is turned on, and the drive current is supplied to the actuator 16.

In this embodiment, four reluctors (inductors) 401 are formed at equal angular intervals on the outer circumference of a cup-shaped yoke (flywheel) 400 of the magnet rotor 4A of the magnet generator 4, and the signal generating rotor is formed. SR is configured and the rotor S
The signal-generating electron SG is opposed to the outer periphery of R. The signal generator SG is a known inductor-shaped generator that includes an iron core having magnetic pole portions facing the outer circumference of the rotor SR, a signal coil wound around the iron core, and a magnet magnetically coupled to the iron core. Electrons generate pulsed signals Vp1 and Vp2 having different polarities in the signal coils when the reluctor 401 starts to face the magnetic pole portion of the signal-generating electron SG and when the reluctor 401 finishes facing the magnetic pole of the signal-generating electron SG. Induce. These pulse-shaped signals are supplied to the waveform shaping circuit 23, and the waveform shaping circuit waveform-shapes the pulse-shaped signal Vp1 having one polarity to generate four pulse signals Vp per rotation.

The pulse signal Vp is given to the frequency voltage converter 24, and the frequency of the pulse signal Vp is converted into the voltage signal Vn 'by the frequency voltage conversion circuit 24. This voltage signal Vn 'is proportional to the engine speed. The output voltage Vn 'of the frequency-voltage conversion circuit is input to the inverting input terminal of the comparator 27 through the voltage limiting circuit 25 including a Zener diode or the like.

Further, a triangular wave signal generator 26 is provided,
The output of the triangular wave signal generator 26 is input to the non-inverting input terminal of the comparator 27, and the output terminal of the comparator 27 is connected to the control terminal 21a of the switch circuit 21.

In this embodiment, the signal generating rotor SR,
The signal generator SG, the waveform shaping circuit 23, the frequency / voltage conversion circuit 24, the voltage limiting circuit 25, the comparator 27, and the triangular wave signal generator 26 constitute the switch control means 22. The power supply for the waveform shaping circuit 23, the frequency voltage conversion circuit 24, the voltage limiting circuit 25, the comparator 27 and the triangular wave signal generator 26 may be from the output side of the rectifier 18, and the output of the negative half cycle of the ignition power supply coil is used. It may be taken from the power supply circuit.

In the embodiment shown in FIG. 4, the output voltage Vn 'of the frequency-voltage converter 24 increases linearly with the increase of the rotation speed N. The maximum value of this voltage Vn 'is limited by the voltage limiting circuit 25. Therefore, the inverting input terminal of the comparator 27 has a rotation speed detection signal V as shown in FIG.
n is entered. The signal Vn linearly increases with the increase of the rotation speed N, reaches the set value Vn1 at the set rotation speed Ns' shown in FIG. 9, and reaches the limit value Vn2 at the set rotation speed Ns. In the area exceeding the set rotation speed Ns, the rotation speed detection signal V
n maintains a constant value Vn2.

As shown in FIG. 6A, the triangular wave signal generator 26 generates a triangular wave signal Vs on which a DC bias voltage equal to the set value Vn1 is superimposed. The comparator 27 is
The rotation speed detection signal Vn and the triangular wave signal Vs are compared, and the potential of the output terminal is set to a high level while the triangular wave signal Vs exceeds the rotation speed detection signal Vn. While the engine speed is low, the speed detection signal Vn cannot exceed the triangular wave signal Vs, so the potential Vt at the output terminal of the comparator 27 is maintained at a high level. At this time, the transistors Tr2 and Tr5 are turned on and the transistor Tr4 is turned off, so that the transistor Tr1 (pump drive switch 21A) is turned on and the transistor Tr3 (actuator drive switch 21B) is turned off. In this state, the duty ratio Dp of the ON operation of the transistor Tr1 becomes 1, and the drive current is supplied only to the pump motor 7A.

The engine speed exceeds the set speed Ns',
When the rotation speed detection signal Vn exceeds the set value Vn1, the rotation speed detection signal Vn can exceed the triangular wave signal Vs, and the period during which the triangular wave signal Vs exceeds the rotation speed detection signal Vn and the rotation speed detection The periods in which the signal Vn exceeds the triangular wave signal Vs alternate with each other. While the triangular wave signal Vs exceeds the rotation speed detection signal Vn, the potential of the output terminal of the comparator 27 is at a high level, so that the transistor Tr1 is turned on and the transistor T1 is turned on in the same manner as above.
r3 shuts off. On the other hand, during the period when the rotation speed detection signal Vn exceeds the triangular wave signal Vs, the potential of the output terminal of the comparator 27 becomes low level, so that the transistors Tr2 and T2 are turned on.
r5 is turned off and transistor Tr4 is turned on. At this time, the transistor Tr1 is turned off and the transistor Tr3 (actuator drive switch) is turned on, so that the drive current Ia is supplied to the actuator 16 through the transistor Tr3. Therefore, when the set rotational speed Ns' is exceeded, the transistors Tr1 and Tr3 are alternately turned on to supply the drive current to the pump motor 7A and the actuator 16 alternately. Transistor Tr3
The duty ratio Da of the ON operation of No. 1 increases as the rotation speed increases, and when the rotation speed reaches the set rotation speed Ns, the increase of the duty ratio Da stops.

FIG. 6B shows the waveform of the potential Vt at the output terminal of the comparator 27 when the rotation speed detection signal Vn reaches the limit value Vn2, and FIGS. 6C and 6D show the waveforms. Drive current I supplied to the pump motor and the actuator, respectively
p and Ia are shown.

The first in the high speed range exceeding the set rotational speed Ns
The magnitudes of the duty ratios Dp and Da of the ON operation of the actuator drive switch can be appropriately changed by adjusting the limit value Vn2 of the rotation speed detection signal Vn.

As described above, according to the embodiment shown in FIG. 4, the pump drive switch 21A and the actuator drive switch 21B are alternately conducted at a predetermined duty ratio to alternately supply current to the pump motor 7A and the actuator 16. Since the power is supplied, the electric power can be distributed to the pump motor and the actuator at an appropriate ratio by appropriately setting the duty ratio of each switch means.

According to the embodiment shown in FIG. 4, the pump drive switch and the actuator drive switch are alternately conducted at a predetermined duty ratio in the region of the set rotational speed Ns' or higher, so that the pump motor and the actuator are connected. The drive current can be supplied alternately. In this case, the current that can be supplied to the actuator by the on / off control of the pump drive switch and the actuator drive switch is a current in the range shown by the diagonal lines in FIG. In FIG. 11, curve a shows the drive current-rotational speed characteristic of the pump motor 7A, and curve b shows the load current-rotational speed when the auxiliary machine driving generator coil 4a generates the rated voltage V1 of the pump motor. It is a characteristic.

In the above embodiment, the switch control means is realized by an electronic circuit, but the switch control means can be realized also by using a microcomputer. FIG. 7 is a flowchart showing an algorithm of the control means when the switch control means is realized by a microcomputer.
It was shown to.

When following this flow chart, first, the pump drive switch 21A is closed and the engine speed is calculated. The engine speed can be obtained, for example, from the generation cycle of a signal output by a signal generator mounted on the internal combustion engine. After calculating the engine speed, it is determined whether or not the engine speed is a speed at which the exhaust valve is moved. In order to make this determination, the number of revolutions of the exhaust valve and the amount of displacement of the exhaust valve are stored in a ROM in advance in the form of a map, and when the number of revolutions is calculated, this map is referred to,
It is determined whether or not it is necessary to move the exhaust valve at the rotation speed. As a result, when it is necessary to move the exhaust valve at the calculated rotation speed, the drive power of the pump motor required to obtain a predetermined fuel pressure at that rotation speed and the exhaust valve at that rotation speed are specified. And the drive power of the actuator required to move only the displacement amount of.

Next, the duty ratio Dp of the pump drive switch necessary to obtain the calculated drive power of the pump motor and the duty ratio Da of the actuator drive switch required to obtain the calculated drive power of the actuator are calculated. Then, the pump drive switch and the actuator drive switch are alternately conducted at the duty ratios Dp and Da, respectively.

Then, the output of the sensor for detecting the position of the exhaust valve is monitored, and when it is confirmed that the movement of the exhaust valve is completed, the actuator drive switch is turned off, and the process returns to the beginning.

In the above embodiment, the pump drive switch and the actuator drive switch are alternately conducted, but both switches may be turned on and off independently at a predetermined duty ratio.

[0060]

As described above, according to the present invention, the auxiliary machine driving power generation coil is commonly provided for both the pump motor and the actuator, and the pump motor and the actuator are driven by the auxiliary machine driving power generation coil. Therefore, in the low speed range where it is not necessary to drive the exhaust valve, the output of the auxiliary machine driving generator coil is used exclusively for driving the pump motor, and the pump motor can be operated without any trouble. In the high speed region of the engine in which the output of the generator coil is sufficiently large, the drive power can be supplied to the actuator for driving the exhaust valve without sacrificing the drive power of the pump motor.

Therefore, according to the present invention, the pump motor and the actuator for driving the exhaust valve can be driven by the common generator coil, and both the fuel pump and the exhaust valve can be driven by using a small-sized magnet generator. There is an advantage that it can be driven without trouble.

Particularly, according to the invention described in claim 2,
A pump drive switch for turning on / off the drive current of the pump motor and an actuator drive switch for turning on / off the drive current of the actuator are provided to control the pump drive switch and the actuator drive switch so that they are conducted at different duty ratios. The output of the machine driving generator coil can be appropriately distributed to the pump motor and the actuator, and the exhaust valve can be operated without impairing the operation of the pump motor even in a region where the rotation speed is relatively low. .

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration of an exemplary embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration example of a drive power supply circuit used in an embodiment of the present invention.

FIG. 3 is a circuit diagram showing another configuration example of the drive power supply circuit used in the embodiment of the present invention.

FIG. 4 is a circuit diagram showing an embodiment in which each part of the embodiment of FIG. 3 is made concrete.

5 is a diagram showing a change of a rotation speed detection signal used in the embodiment of FIG. 4 with respect to a rotation speed.

6A to 6D are waveform charts showing signal waveforms of respective portions of the embodiment of FIG.

FIG. 7 is a flowchart showing an algorithm when the switch control means is realized by a microcomputer.

FIG. 8 is a diagram showing an example of output voltage-output current characteristics of a magnet generator.

FIG. 9 is a diagram showing an example of operating characteristics of an exhaust valve.

10 is a diagram showing the drive current vs. rotational speed characteristic of the fuel pump and the output voltage of the auxiliary machine driving power generation coil that generate the rated voltage of the pump motor in a region where the actuator can be driven when the drive power supply circuit of FIG. 2 is used. It is the diagram shown using the load current vs. rotation speed characteristic at the time of performing.

FIG. 11 shows a drive current vs. rotational speed characteristic of a fuel pump and an output voltage of an auxiliary machine driving power generation coil that generates a rated voltage of a pump motor in a region where an actuator can be driven when the drive power supply circuit of FIG. 3 is used. It is the diagram shown using the load current vs. rotation speed characteristic at the time of performing.

[Explanation of symbols]

 1 Internal Combustion Engine 2 Intake Pipe 3 Exhaust Pipe 4 Magnet Generator 5 Throttle Valve 6 Injector 7 Fuel Pump 7A Pump Motor 7B Pump 11 Pressure Regulator 12 Exhaust Valve 16 Actuator 17 Drive Power Supply Circuit 21 Switch Circuit 21A Pump Drive Switch 21B Actuator Drive Switch 22 Switch control means

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[Procedure amendment]

[Submission date] April 16, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Patent application title: A power supply device for driving an auxiliary machine of an internal combustion engine

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust characteristic adjusting device for adjusting a characteristic of an exhaust system and a motor for driving a fuel pump for supplying fuel to an injector among auxiliary devices provided in an internal combustion engine.
The present invention relates to an auxiliary machine power supply device for an internal combustion engine that supplies drive power to an actuator that drives a regulating valve.

[0002]

2. Description of the Related Art In this specification, an auxiliary machine of an internal combustion engine means various equipment attached to the engine for operating the internal combustion engine.

Recently, in order to improve the performance of an internal combustion engine, an electric type is often used as an auxiliary machine of the engine. For example, in recent internal combustion engines, a fuel injection device is often used as a means for supplying fuel. In that case, an electric injector, a fuel pump for supplying fuel to the injector, and the fuel pump are driven. Requires a pump motor (electric motor).

Further, in order to enhance the high speed performance of the engine, an exhaust valve for adjusting the characteristics (resonance frequency) of the exhaust system is provided,
By adjusting the exhaust valve at high engine speed, a standing wave is generated in the exhaust system to improve exhaust efficiency and air supply efficiency.In this case, however, the exhaust valve is driven. Requires an electric actuator.

Further, the gasoline engine requires an ignition device and an electronic device such as a microcomputer for controlling the ignition timing and the fuel injection timing.

Conventionally, the fuel injection device and the exhaust valve have been used mainly for internal combustion engines such as vehicles equipped with a battery, but recently, even in vehicles without a battery, the performance of the engine has been improved. In order to improve the fuel consumption, it has been considered to use a fuel injection device, an exhaust valve, or an electronic device such as a microcomputer.

Therefore, in order to enable the fuel injection device to be used in an internal combustion engine of a vehicle or the like which is not equipped with a battery,
It has been proposed to provide a generator coil for driving a pump in a magnet generator attached to an engine, and drive the pump motor with the generator coil for driving the pump.

Further, it is noted that only the half cycle output of the ignition power supply coil provided in the magnet generator is used to supply the ignition energy , and it is not used to supply the ignition energy of the ignition power supply coil. Attempts have been made to construct a DC power supply using the output of a half cycle, and to drive an injector or an electronic device such as a microcomputer with the output of this DC power supply.

[0009]

To provide an exhaust characteristic-adjusting valve engine of a vehicle such as the battery is mounted [0008] by providing a power generation coil for driving valves for magneto generator mounted to the engine, it is conceivable to supply power to the actuator for Riva Lube driven by the said generating coil.

[0010] However, the magneto generator, it is necessary to supply power to the lighting load and the like, when the power generation coil for the ignition power supply coil and the pump drive on board magnet generator is already provided, further to Ba It is often difficult to provide a generator coil for driving the lube. When stronger and it is intended to create the generating coil for driving valves, the magneto generator is large in size, it is large in size the engine on the cost becomes high.

An object of the present invention, when the battery is not mounted, the exhaust characteristic-adjusting without the valve exclusive generator coil specially provided, so that it is possible to drive both the fuel injector and valves Another object of the present invention is to provide a power supply device for driving an accessory of an internal combustion engine.

[0012]

DISCLOSURE OF THE INVENTION The present invention relates to a pump motor for driving a fuel pump for supplying fuel to an injector in an auxiliary machine provided in an internal combustion engine, and an exhaust characteristic adjusting valve for adjusting characteristics of an exhaust system. The present invention relates to an electric power source device for driving an auxiliary machine of an internal combustion engine, which supplies electric power to an electric actuator for driving the engine.

According to another aspect of the present invention, a magneto-generator driven by an internal combustion engine is provided with a generator coil for driving an auxiliary machine, which is common to both the pump motor and the actuator. A drive power supply circuit that supplies drive power to the pump motor and the actuator by using the power generation coil as a power source is provided.

According to a second aspect of the present invention, in the drive power supply circuit, a pump drive switch for turning on / off the drive current of the pump motor, an actuator drive switch for turning on / off the drive current of the actuator, a pump drive switch and an actuator drive. And a switch control device for electrically connecting the switches with different duty ratios.

[0015]

When the fuel is supplied to the engine by the injector, the system for supplying the fuel from the electric pump to the injector so that the fuel supply amount is determined by the time for opening the valve of the injector (the time for giving the injection command to the injector). A pressure regulator is provided in the to maintain the pressure (fuel pressure) of the fuel supplied to the injector constant.

The discharge amount of the fuel pump driven by the motor is substantially proportional to the driving torque of the motor, and the driving torque of the motor is proportional to the driving current of the motor. While the engine speed is low and the magneto generator output is low, the discharge pressure of the pump does not reach the value required to maintain the rated value of fuel pressure (adjusted by the pressure regulator). Drive current increases with an increase in rotation speed.
When the engine speed exceeds the set value, the pump discharge pressure tries to exceed the rated value of the fuel pressure, but the fuel pressure is kept at the rated value by the pressure regulator, so the pump discharge pressure is kept at a constant value. , The drive current of the motor is limited to a constant value. Therefore, in the middle and high speed regions of the engine, the output of the power generation coil becomes redundant, and the excess output is discarded.

On the other hand, in most cases, the exhaust characteristic adjusting valve provided in the exhaust system is operated only when the engine is operating at high speed. Therefore, drive power is supplied to the actuator when the engine is operating at high speed. I wish I could.

Therefore, as in the present invention, the auxiliary machine driving power generation coil is commonly provided for both the pump motor and the actuator, and the auxiliary machine driving power generation coil drives the pump motor and the actuator. In this case, in the low speed region where it is not necessary to drive the exhaust characteristic adjusting valve, the output of the auxiliary machine driving power generation coil is used exclusively for driving the pump motor, and the pump motor can be operated without any trouble. In the high speed range of the engine capable enough room in the output of the generating coil, without sacrificing the driving power of the pump motor, it is possible to supply driving power to the actuator for driving valves.

[0019] Thus, according to the present invention, for driving an actuator of the pump motor and valves for driving the common generating coil, a fuel pump with a small magnet generator and exhaust characteristic adjustment valve Both of them can be driven without any trouble, and even if the battery is not mounted, the performance of the engine is improved by using the fuel injection device and the exhaust characteristic adjusting valve without using a large-sized magnet generator. be able to.

In particular, as in the invention described in claim 2,
When a pump drive switch for turning on / off the drive current of the pump motor and an actuator drive switch for turning on / off the drive current of the actuator are provided, and the pump drive switch and the actuator drive switch are controlled to conduct at different duty ratios, the auxiliary machine Since the output of the drive generator coil can be appropriately distributed to the pump motor and the actuator, the exhaust valve can be operated without impairing the operation of the pump motor even in a region where the rotation speed is relatively low.

[0021]

1 shows the overall construction of an embodiment of the present invention, in which 1 is an internal combustion engine having an intake pipe 2 and an exhaust pipe 3, and 4 is attached to an output shaft 1a of the internal combustion engine 1. It is a magnet generator composed of a magnet rotor 4A and a stator 4B attached to the case of the engine.

A throttle valve 5 is mounted on the inlet side of the intake pipe 2, and an injector 6 is mounted so as to inject fuel into a space in the intake pipe downstream of the throttle valve 5. The injector 6 includes a valve that opens and closes an injection port and an electromagnet that operates the valve. The injector 6 is excited to open the valve while the injection command signal is given.

A fuel pump 7 is composed of a pump motor (electric motor) 7A and a pump 7B driven by the motor. The suction port of the pump 7B is connected to a fuel tank 9 through a pipe 8.
The discharge port of the pump 7B is connected to the fuel supply port of the injector 6 via the pipe 10.

Reference numeral 11 denotes a pressure regulator connected between the fuel supply port of the injector 6 and the fuel tank 9, and this pressure regulator has a set value for the pressure of the fuel supplied to the fuel supply port of the injector 6. By returning a part of the fuel to the fuel tank 9 when it exceeds, the pressure (fuel pressure) of the fuel supplied to the injector 6 is kept constant.

When the injection command signal is given to the injector 6, the valve of the injector 6 opens, so that the fuel is injected from the injection port into the intake pipe 2. The amount of fuel given to the engine is determined by the fuel pressure and the injection time. The time for giving the injection command signal to the injector 6 is controlled so that the mixed gas having the optimum air-fuel ratio is given into the cylinder of the engine at each engine speed.

The exhaust pipe 3 is provided with a cavity 3A, and an exhaust characteristic adjusting valve 12 is provided so as to change the opening cross-sectional area of the pipeline on the upstream side of the cavity 3A. The exhaust characteristic adjusting valve 12 of the present embodiment is
Consist valve linear displacement shaped and out into the exhaust pipe to change the opening cross-sectional area of the exhaust pipe 3 from a direction perpendicular to the axial direction of the exhaust pipe 3, this valves are connected to 該Ba lube Rack 13, the pinion 14 meshed with the rack 13, and the electric motor 15 for rotating the pinion 14
It is driven by an actuator 16 composed of

The exhaust characteristic adjusting valve 12 need not be of the linear displacement type, but may be of the rotary type.

The exhaust characteristic adjusting valve 12 is provided for increasing resonance efficiency in the engine by causing resonance in the cavity provided in the exhaust system when the engine is operating at high speed. The actuator 16 is operated so that the opening degree becomes an optimum size. Figure 9
An example of a change in the operating angle θ of the actuator 16 for operating the exhaust characteristic adjusting valve with respect to the rotational speed N is shown. In the example shown by the solid line in FIG. 9, the set rotational speed Ns (> N
2) In the above range, a drive current is applied to the actuator 16 to change the operating angle θ of the actuator from 0 to θ 4 (0 <θ1
<Θ2 <θ3 <θ4) is changed.
In the example shown in FIG. 9, the operating angle of the actuator is 0.
In the state, there opening degree of the exhaust gas characteristic-adjusting valve is in the lowest state, go opening degree of the exhaust gas characteristic-adjusting valve is increased according to the operation angle of the actuator becomes large.
By adjusting the opening degree of the exhaust gas characteristic-adjusting valve in the set rotational speed Ns or more areas, to increase the amount of gas flowing into the exhaust <br/> the trachea and the exhaust pipe to the resonance state, thereby supplying air It improves efficiency and improves engine output.

At each rotational speed, the exhaust characteristic adjusting valve is controlled so that its opening degree is matched with the target opening degree.
A position sensor for detecting the position of the characteristic-adjusting valve is provided, the actuator 16 so as to match the position of the valves, which are detected by the position sensor to the target position is controlled.

In the present invention, the auxiliary generator driving power generation coil 4a common to the pump motor 7A and the actuator 16 is provided in the magnet generator 4, and the output of the auxiliary machinery driving power generation coil 4a is the driving power. It is supplied to the pump motor 7A and the actuator 16 via the supply circuit 17.

An ignition power supply coil for supplying ignition energy to the ignition device of the engine is provided outside the power generation coil 4a in the magnet generator 4, and further a power generation coil for driving a lighting load or the like as required. Is provided. The ignition power supply coil induces an AC voltage in synchronization with the rotation of the engine. Normally, only the positive half-cycle output of the ignition power supply coil is used to supply ignition energy to the ignition device, so a power supply circuit for generating a constant DC voltage is constructed using the negative half-cycle output. It This power supply circuit is composed of, for example, a power supply capacitor charged by the output of the negative half cycle of the ignition power supply coil, and a control circuit for maintaining the voltage across the power supply capacitor at a constant value. This power circuit
In addition to being used as a power source for a control circuit or a microcomputer for controlling ignition timing or fuel injection timing, it is also used as a power source for giving an injection command signal to the injector 6.

FIG. 2 shows an example of the structure of the driving power supply circuit 17. In this example, a full-wave rectifier 18 for rectifying the output of the auxiliary machine driving generator coil 4a and an output terminal of the rectifier 18 are connected. The smoothing power supply capacitor 19 and the voltage regulator 20 for controlling the voltage across the capacitor 19 so as to limit the voltage across the capacitor 19 to the rated voltage V1 or less of the pump motor. The DC voltage obtained across the capacitor 19 is the pump motor. 7A and the actuator 16.

The voltage regulator 20 short-circuits the generator coil 4a to reduce the output voltage of the generator coil 4a when the voltage across the capacitor 19 exceeds the rated value, and the capacitor 1
When the voltage across 9 goes below the rated value, the generator coil 4
It is composed of a circuit for recovering the output voltage of the generator coil 4a by canceling the short circuit of a, and controls the output voltage of the generator coil 4a so as to limit the voltage across the capacitor 19 to a rated value or less.

The output characteristic of the magnet generator 4 is, for example, as shown by the curves N1 to N4 in FIG. Curves N1 to N in FIG.
4 is the engine speed N1 to N4 (N1 <N2 <
It shows the characteristics of output voltage V vs. load current I when N3 <N4). A straight line L in FIG. 8 is the load characteristic of the pump motor. In FIG. 8, I1 is the rated current of the pump motor determined by the adjustment value by the pressure regulator 11. When the drive current of the pump motor reaches the rated current I1, the discharge pressure of the pump reaches the adjustment value of the pressure regulator. .

The drive current of the pump motor 7A increases as the rotation speed N increases, as indicated by the curve a in FIG. In FIG. 10, the curve B shows the load current-rotational speed characteristic when the auxiliary machine driving generator coil 4a generates the rated voltage V1 of the pump motor.

When the number of revolutions exceeds N1, the drive current of the pump motor can reach the rated current I1. When the drive current of the pump motor exceeds the rated value I1,
The discharge pressure of the pump tends to overcome the pressure adjustment value of the pressure regulator, but when the discharge pressure of the pump exceeds the adjustment value of the pressure regulator, the pressure regulator adjusts the pressure and the discharge pressure of the pump Since it is decreased, the load torque of the pump motor eventually becomes constant, and the drive current is kept at the rated current I1 even if the rotation speed increases. The voltage applied to the pump motor increases as the rotation speed increases, and when the rotation speed reaches N2, the applied voltage of the pump motor reaches the rated voltage V1. If the voltage regulator 20 is not provided, the voltage applied to the pump motor becomes V2 (see FIG. 8) when the rotation speed rises to N4.

In this embodiment, the generator coil 4 is arranged so that the voltage across the power supply capacitor 19 is limited to the rated value V1 or less.
Since the voltage regulator 20 that adjusts the output voltage of a is provided, the applied voltage of the pump motor is maintained at V1. When the voltage is limited to V1 and the rotational speed rises to N4, the current I2 can flow from the magneto coil 4a to the load as shown in FIG. 8, but in reality, the pressure regulator 11 is provided. Due to this, the drive current of the pump motor is limited to the rated value I1. Therefore, when the generator coil 4a uses only the pump motor as a load, when the engine speed increases to N4, V1 x The electric power of (I2-I1) is wasted and wasted by the voltage regulator 20. When the generator coil 4a uses only the pump motor 7A as a load, it is possible to supply the current in the shaded range in FIG. 10 to other loads in the medium-high speed rotation region where the engine speed exceeds N2.

In the present invention, the actuator 16 is utilized by utilizing the surplus electric power generated in the region exceeding the rotation speed N2.
To drive the pump motor 7A and actuator 1
6 and 6 can be driven by a common auxiliary machine driving generator coil 4a.

FIG. 3 shows another embodiment of the present invention. In this embodiment, a switch circuit for selectively supplying the current given from the generator coil 4a through the rectifier 18 to the pump motor 7A and the actuator 16. 21 and a switch control means 22 for controlling the switch circuit 21 are provided. The switch circuit 21 includes a pump drive switch 21A for turning on and off a drive current of the pump motor,
An actuator drive switch 21B for turning on and off the drive current of the actuator is provided, and the switch control means 22 sets the pump drive switch 21A and the actuator drive switch 21B to different duty ratios D.
Control is performed so that p and Da are alternately conducted.

The duty ratio D is D when the ON period of the switch means is Ton and the OFF period is Toff.
= Ton / (Ton + Toff) and Dp + Da = 1
Have a relationship.

With this structure, the output of the auxiliary machine driving power generation coil 4a is supplied to the pump motor 7A and the actuator 1.
6, the actuator 16 can be operated without impairing the operation of the pump motor 7A even in a region where the rotation speed is relatively low, as shown by the broken line in FIG. It is also possible to start the operation of the actuator 16 at a set rotational speed Ns' lower than the rotational speed N2 at which the voltage applied to the pump motor reaches the rated value V1.

An embodiment in which each part of FIG. 3 is concretely shown is shown in FIG. In the switch circuit 21 of the embodiment shown in FIG. 4, the transistors Tr1 and Tr2 and the resistors R1 and R2 constitute a pump drive switch 21A, and the transistors Tr3 to Tr5 and the resistors R3 to R5 constitute an actuator drive switch 21B. Has been done. Reference numeral 21a is a control terminal of the switch circuit. When a high-level trigger signal is applied to this control terminal, the transistors Tr2 and Tr5 are turned on and the transistor Tr4 is turned off. At this time, the transistor Tr1 is turned on and the transistor Tr3 is turned off, so that the pump motor 7 passes through the transistor Tr1.
A drive current is supplied to A.

When the trigger signal is removed from the control terminal 21a and the potential of the control terminal becomes low level, the transistors Tr2 and Tr5 are turned off and the transistor T is turned off.
r4 becomes conductive. At this time, the transistor Tr1 is turned off, the transistor Tr3 is turned on, and the drive current is supplied to the actuator 16.

In this embodiment, four reluctors (inductors) 401 are formed at equal angular intervals on the outer circumference of a cup-shaped yoke (flywheel) 400 of the magnet rotor 4A of the magnet generator 4, and the signal generating rotor is formed. SR is configured and the rotor S
The signal-generating electron SG is opposed to the outer periphery of R. The signal generator SG is a known inductor-shaped generator that includes an iron core having magnetic pole portions facing the outer circumference of the rotor SR, a signal coil wound around the iron core, and a magnet magnetically coupled to the iron core. Electrons generate pulsed signals Vp1 and Vp2 having different polarities in the signal coils when the reluctor 401 starts to face the magnetic pole portion of the signal-generating electron SG and when the reluctor 401 finishes facing the magnetic pole of the signal-generating electron SG. Induce. These pulse-shaped signals are supplied to the waveform shaping circuit 23, which waveform-shapes the pulse-shaped signal Vp1 having one polarity to generate four pulse signals Vp per rotation.

The pulse signal Vp is given to the frequency voltage converter 24, and the frequency of the pulse signal Vp is converted into the voltage signal Vn 'by the frequency voltage conversion circuit 24. This voltage signal Vn 'is proportional to the engine speed. The output voltage Vn 'of the frequency-voltage conversion circuit is input to the inverting input terminal of the comparator 27 through the voltage limiting circuit 25 including a Zener diode or the like.

Further, a triangular wave signal generator 26 is provided,
The output of the triangular wave signal generator 26 is input to the non-inverting input terminal of the comparator 27, and the output terminal of the comparator 27 is connected to the control terminal 21a of the switch circuit 21.

In this embodiment, the signal generating rotor SR,
The signal generator SG, the waveform shaping circuit 23, the frequency / voltage conversion circuit 24, the voltage limiting circuit 25, the comparator 27, and the triangular wave signal generator 26 constitute the switch control means 22. The power supply for the waveform shaping circuit 23, the frequency voltage conversion circuit 24, the voltage limiting circuit 25, the comparator 27, and the triangular wave signal generator 26 may be from the output side of the rectifier 18, and the output of the negative half cycle of the ignition power supply coil is used. It may be taken from the power supply circuit.

In the embodiment shown in FIG. 4, the output voltage Vn 'of the frequency-voltage converter 24 increases linearly with the increase of the rotation speed N. The maximum value of this voltage Vn 'is limited by the voltage limiting circuit 25. Therefore, the inverting input terminal of the comparator 27 has a rotation speed detection signal V as shown in FIG.
n is entered. The signal Vn linearly increases with the increase of the rotation speed N, reaches the set value Vn1 at the set rotation speed Ns' shown in FIG. 9, and reaches the limit value Vn2 at the set rotation speed Ns. In the area exceeding the set rotation speed Ns, the rotation speed detection signal V
n maintains a constant value Vn2.

As shown in FIG. 6A, the triangular wave signal generator 26 generates a triangular wave signal Vs on which a DC bias voltage equal to the set value Vn1 is superimposed. The comparator 27 is
The rotation speed detection signal Vn and the triangular wave signal Vs are compared, and the potential of the output terminal is set to a high level while the triangular wave signal Vs exceeds the rotation speed detection signal Vn. While the engine speed is low, the speed detection signal Vn cannot exceed the triangular wave signal Vs, so the potential Vt at the output terminal of the comparator 27 is maintained at a high level. At this time, the transistors Tr2 and Tr5 are turned on and the transistor Tr4 is turned off, so that the transistor Tr1 (pump drive switch 21A) is turned on and the transistor Tr3 (actuator drive switch 21B) is turned off. In this state, the duty ratio Dp of the ON operation of the transistor Tr1 becomes 1, and the drive current is supplied only to the pump motor 7A.

The engine speed exceeds the set speed Ns',
When the rotation speed detection signal Vn exceeds the set value Vn1, the rotation speed detection signal Vn can exceed the triangular wave signal Vs, and the period during which the triangular wave signal Vs exceeds the rotation speed detection signal Vn and the rotation speed detection The periods in which the signal Vn exceeds the triangular wave signal Vs alternate with each other. While the triangular wave signal Vs exceeds the rotation speed detection signal Vn, the potential of the output terminal of the comparator 27 is at a high level, so that the transistor Tr1 is turned on and the transistor T1 is turned on in the same manner as above.
r3 shuts off. On the other hand, during the period when the rotation speed detection signal Vn exceeds the triangular wave signal Vs, the potential of the output terminal of the comparator 27 becomes low level, so that the transistors Tr2 and T2 are turned on.
r5 is turned off and transistor Tr4 is turned on. At this time, the transistor Tr1 is turned off and the transistor Tr3 (actuator drive switch) is turned on, so that the drive current Ia is supplied to the actuator 16 through the transistor Tr3. Therefore, when the set rotational speed Ns' is exceeded, the transistors Tr1 and Tr3 are alternately turned on to supply the drive current to the pump motor 7A and the actuator 16 alternately. Transistor Tr3
The duty ratio Da of the ON operation of No. 1 increases as the rotation speed increases, and when the rotation speed reaches the set rotation speed Ns, the increase of the duty ratio Da stops.

FIG. 6B shows the waveform of the potential Vt at the output terminal of the comparator 27 when the rotation speed detection signal Vn reaches the limit value Vn2, and FIGS. 6C and 6D show the waveforms. Drive current I supplied to the pump motor and the actuator, respectively
p and Ia are shown.

The first in the high speed range exceeding the set rotational speed Ns
The magnitudes of the duty ratios Dp and Da of the ON operation of the actuator drive switch can be appropriately changed by adjusting the limit value Vn2 of the rotation speed detection signal Vn.

As described above, according to the embodiment shown in FIG. 4, the pump drive switch 21A and the actuator drive switch 21B are alternately conducted at a predetermined duty ratio to alternately supply current to the pump motor 7A and the actuator 16. Since the power is supplied, the electric power can be distributed to the pump motor and the actuator at an appropriate ratio by appropriately setting the duty ratio of each switch means.

According to the embodiment shown in FIG. 4, the pump drive switch and the actuator drive switch are alternately conducted at a predetermined duty ratio in the region of the set rotational speed Ns' or higher, so that the pump motor and the actuator are connected. The drive current can be supplied alternately. In this case, the current that can be supplied to the actuator by the on / off control of the pump drive switch and the actuator drive switch is a current in the range shown by the diagonal lines in FIG. In FIG. 11, curve a shows the drive current-rotational speed characteristic of the pump motor 7A, and curve b shows the load current-rotational speed when the auxiliary machine driving generator coil 4a generates the rated voltage V1 of the pump motor. It is a characteristic.

In the above embodiment, the switch control means is realized by an electronic circuit, but the switch control means can be realized also by using a microcomputer. FIG. 7 is a flowchart showing an algorithm of the control means when the switch control means is realized by a microcomputer.
It was shown to.

When following this flow chart, first, the pump drive switch 21A is closed and the engine speed is calculated. The engine speed can be obtained, for example, from the generation cycle of a signal output by a signal generator mounted on the internal combustion engine. After calculating the rotation speed of the engine, the speed exhaust Patent
It is determined whether or not the number of revolutions moves the sex adjusting valve. To make this determination, the engine speed to move the exhaust characteristic-adjusting valve, in the form of a map in advance and the displacement amount of the valves RO
M may be stored in, by referring to the map when the rotational speed is computed, it determines whether it is necessary to move the rotational speed Device Lube. As a result, when it is necessary to move the exhaust characteristic adjustment valve at the calculated rotation speed, the drive power of the pump motor required to obtain a predetermined fuel pressure at that rotation speed and the exhaust characteristic adjustment valve. And the drive power of the actuator necessary to move the actuator by the specified displacement amount at the rotational speed.

Next, the duty ratio Dp of the pump drive switch necessary to obtain the calculated drive power of the pump motor and the duty ratio Da of the actuator drive switch required to obtain the calculated drive power of the actuator are calculated. Then, the pump drive switch and the actuator drive switch are alternately conducted at the duty ratios Dp and Da, respectively.

[0058] Then by monitoring the output of the sensor for detecting the position of the exhaust characteristic-adjusting valve, and an actuator drive switch a cutoff state when the the movement of the valves is completed is confirmed, returns to the start.

In the above embodiment, the pump drive switch and the actuator drive switch are alternately conducted, but both switches may be turned on and off independently at a predetermined duty ratio.

[0060]

As described above, according to the present invention, the auxiliary machine driving power generation coil is provided in common for both the pump motor and the valve driving actuator, and the auxiliary machine driving power generation coil is used. Since the pump motor and the actuator are driven, in the low speed range where it is not necessary to drive the exhaust characteristic adjusting valve, the output of the auxiliary machine driving power generation coil is used exclusively for driving the pump motor. can be operated without any trouble, and in the high speed range of the engine capable enough room in the output of the generating coil, without sacrificing the driving power of the pump motor, to supply driving power to the actuator for driving valves You can

[0061] Therefore, according to the present invention, the pump motor
Valves can an actuator for driving be driven by a common generating coil, there is an advantage that both the can drive without hindrance between the fuel pump and the exhaust characteristic adjustment valve with a small magnet generator.

Particularly, according to the invention described in claim 2,
A pump drive switch for turning on / off the drive current of the pump motor and an actuator drive switch for turning on / off the drive current of the actuator are provided to control the pump drive switch and the actuator drive switch so that they are conducted at different duty ratios. The output of the generator coil for machine drive can be properly distributed to the pump motor and the actuator, and the exhaust characteristics can be maintained without impairing the operation of the pump motor even in the region where the rotation speed is relatively low.
There is an advantage that the adjusting valve can be operated.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration of an exemplary embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration example of a drive power supply circuit used in an embodiment of the present invention.

FIG. 3 is a circuit diagram showing another configuration example of the drive power supply circuit used in the embodiment of the present invention.

FIG. 4 is a circuit diagram showing an embodiment in which each part of the embodiment of FIG. 3 is made concrete.

5 is a diagram showing a change of a rotation speed detection signal used in the embodiment of FIG. 4 with respect to a rotation speed.

6A to 6D are waveform charts showing signal waveforms of respective portions of the embodiment of FIG.

FIG. 7 is a flowchart showing an algorithm when the switch control means is realized by a microcomputer.

FIG. 8 is a diagram showing an example of output voltage-output current characteristics of a magnet generator.

FIG. 9 is a diagram showing an example of operating characteristics of an exhaust characteristic adjusting valve.

10 is a diagram showing the drive current vs. rotational speed characteristic of the fuel pump and the output voltage of the auxiliary machine driving power generation coil that generate the rated voltage of the pump motor in a region where the actuator can be driven when the drive power supply circuit of FIG. 2 is used. It is the diagram shown using the load current vs. rotation speed characteristic at the time of performing.

FIG. 11 shows a drive current vs. rotational speed characteristic of a fuel pump and an output voltage of an auxiliary machine driving power generation coil that generates a rated voltage of a pump motor in a region where an actuator can be driven when the drive power supply circuit of FIG. 3 is used. It is the diagram shown using the load current vs. rotation speed characteristic at the time of performing.

[Explanation of Codes] 1 Internal Combustion Engine 2 Intake Pipe 3 Exhaust Pipe 4 Magnet Generator 5 Throttle Valve 6 Injector 7 Fuel Pump 7A Pump Motor 7B Pump 11 Pressure Regulator 12 Exhaust Characteristic Adjustment Valve 16 Actuator 17 Drive Power Supply Circuit 21 Switch Circuit 21A Pump drive switch 21B Actuator drive switch 22 Switch control means

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 7

[Correction method] Change

[Correction content]

[Figure 7]

Claims (2)

[Claims] 1. Electric power is supplied to a pump motor that drives a fuel pump that supplies fuel to an injector and an electric actuator that drives an exhaust valve that adjusts a resonance frequency of an exhaust system, among auxiliary devices provided in an internal combustion engine. A power supply device for driving an auxiliary machine of an internal combustion engine, wherein the auxiliary machine driving power generation coil is provided commonly to both the pump motor and the actuator in the magnet generator driven by the internal combustion engine, A power supply device for driving an auxiliary machine of an internal combustion engine, comprising: a drive power supply circuit that supplies drive power to the pump motor and the actuator by using the auxiliary machine drive power generation coil as a power source. 2. The drive power supply circuit, a pump drive switch for turning on and off the drive current of the pump motor,
The internal combustion engine according to claim 1, further comprising an actuator drive switch that turns on and off a drive current of the actuator, and a switch control device that conducts the pump drive switch and the actuator drive switch at different duty ratios. Power supply device for driving auxiliary equipment.