JP4181183B2 - Fuel injection device and abnormality determination method for fuel injection device - Google Patents

Description

  The present invention is used, for example, in fuel injection control of a motorcycle engine, and an engine using a fuel injection module having a function of sucking, pressurizing and injecting fuel by reciprocating a plunger by energizing a solenoid. The present invention relates to a fuel injection device and an abnormality determination method thereof.

  In an electronically controlled fuel injection device that calculates the fuel supply amount according to the engine speed and load and gives a drive signal to the fuel injection valve, the plunger is reciprocated by electromagnetic force to suck and pressurize the fuel. Fuel injection modules that inject are known. In the operation of the fuel injection module, the solenoid is energized by a drive signal given from the control unit, the plunger pressurizes the fuel, and the fuel is injected at a predetermined fuel pressure. When the energization of the solenoid is stopped, the plunger is pushed back by the spring and the fuel to be injected next is sucked.

  A fuel injection device using a fuel injection module has fewer components than a fuel injection device that uses a fuel pump and pressure regulator to pressurize and regulate fuel and injects pressurized fuel with an injector. Since the module is energized only during injection, it has the advantage of low average power consumption. For this reason, it is particularly suitable for a small two-wheeled vehicle having a low capacity of a generator or a battery.

As a fuel injection method using this fuel injection module, for example, a current value is detected when a predetermined time elapses after the drive of the fuel injection solenoid is started, and the detected value is based on the detected value. And a drive pulse width required from the required fuel amount, a correction value of the pulse width is obtained, and the actual drive pulse width is increased / decreased using the correction value to thereby correct the fuel due to the coil temperature, etc. A technique for reducing the influence of the injection amount is disclosed (see Patent Document 1).
Further, as a solenoid driving device of this fuel injection module, for example, when the current of the solenoid is cut off and the driving is stopped, the electric power stored in the solenoid is temporarily stored in the capacitor, and when the solenoid is driven again, A technique provided with means for discharging stored power and supplying it to a solenoid is disclosed (for example, see Patent Document 2).

JP 2003-113732 A (2nd page, FIG. 3) Japanese Patent Laying-Open No. 2003-49687 (second page, FIG. 1)

In a fuel injection system using a fuel injection module, current is supplied only during fuel injection, so that the average current consumption is small, but a large current flows during injection. For example, when the resistance value of the solenoid of the fuel injection module is designed to be about 1.5Ω, when driven with a battery voltage of 14 V, a current of 4 to 9 A flows depending on the drive pulse width.
If the battery is in a discharged state or a deteriorated state, the electric power necessary for driving the fuel injection module cannot be obtained, the amount of fuel supplied to the engine is reduced, and the engine operating state becomes unstable. In addition, when the battery is in a discharged state or a deteriorated state, the battery voltage decreases due to the driving of the fuel injection module, the control unit that gives a drive signal to the fuel injection module may not operate normally, and the engine operation may not be continued. .

  The conventional fuel injection device shown in the above-mentioned patent document has a problem that the battery state cannot be monitored correctly because it does not include means for appropriately determining the discharge state or the deterioration state of the battery. In particular, when used in a small two-wheeled vehicle, the power generation capacity of the generator is small and the capacity of the battery is small. Therefore, in order to avoid the above problems, the need for battery management increases. It is difficult for a typical user to manage the battery on a daily basis.

  The present invention has been made to solve the above problems, and provides a fuel injection device in which a control unit accurately monitors the state of a battery and can prompt a user to maintain the battery. The purpose is to prevent engine malfunction and engine stall.

A fuel injection apparatus according to the present invention includes a fuel injection module having a function of reciprocating a plunger by turning on / off a current to a solenoid to suck and pressurize and inject fuel, and a fuel injection module based on an operating state of an engine In a fuel injection device including a control unit that supplies a drive signal to the engine, a generator that generates power by rotating the engine, and a battery that stores electric power , the solenoid is stored in the solenoid immediately after the drive signal is turned off. temporarily stored in the capacitor power was, the next time the drive signal is turned on and the solenoid driving circuit for discharging the solenoid, and the battery voltage detection means, and a battery state determining means in the control unit, drive motion signal is turned on in the on state, the discharge completion time longer than the set predetermined time has elapsed of capacitor Detects the battery voltage by the battery voltage detection means, to determine the battery state by comparing the battery voltage with a predetermined value by the battery state determining means, in which be displayed on the display unit of the determination result.

Also, immediately after the solenoid drive signal is turned off, the power stored in the solenoid is temporarily stored in the capacitor, and when the next drive signal is turned on, the solenoid drive circuit that discharges to the solenoid, the solenoid current detection means, the battery and a state determination unit in the control unit, the on-state drive motion signal is turned on, after the set predetermined time longer than the discharge completion time of the capacitor, detects the solenoid current by the solenoid current detecting means, a battery The state determination means compares the solenoid current with a predetermined value to determine the battery state, and the determination result is displayed on the display means.

In addition, immediately after the solenoid drive signal is turned off, the power stored in the solenoid is temporarily stored in the capacitor, and when the next drive signal is turned on, the solenoid drive circuit that discharges to the solenoid, the battery voltage detection means, the solenoid a current detection means, and a battery state determining means in the control unit, the on-state drive motion signal is turned on, after the set predetermined time longer than the discharge completion time of the capacitor, the battery by the battery voltage detecting means The voltage is detected, the solenoid current is detected by the solenoid current detection means, the battery state determination means compares the calculated value calculated from the battery voltage and the solenoid current with a predetermined value to determine the battery state, and the determination result is displayed. It is intended to be displayed.

In addition, immediately after the solenoid drive signal is turned off, the power stored in the solenoid is temporarily stored in the capacitor, and when the next drive signal is turned on, the solenoid drive circuit that discharges to the solenoid, battery voltage detection means , battery and a state determination unit in the control unit, and the battery voltage when driving the dynamic signal is turned off, the predetermined time is set longer than a discharge completion time of the capacitor in driving motion signal is turned on on-state after the lapse of the battery The voltage is detected by the battery voltage detection means, the difference between the two battery voltages is obtained by the battery state determination means, compared with a predetermined value, the battery state is determined, and the determination result is displayed on the display means.

  According to the fuel injection device of the present invention, the solenoid drive signal is turned on and the battery voltage is detected by the battery voltage detection means after a predetermined time has elapsed in the on state, and the battery voltage detected by the battery state determination means is set to the predetermined value. Since the battery state is determined by comparison and the determination result is displayed on the display means, the battery abnormality is determined based on the battery voltage during energization of the solenoid, so that the battery abnormality can be detected with high accuracy. Further, since the abnormal state of the battery can be visually recognized, the abnormality can be transmitted to the user before a malfunction such as engine malfunction or engine stall occurs.

  Also, after the solenoid drive signal is turned on and a predetermined time has passed in the on state, the solenoid current is detected by the solenoid current detecting means, and the battery state is determined by comparing the solenoid current with a predetermined value by the battery state determining means. Since the result is displayed on the display means, the battery abnormality is determined based on the solenoid current during energization of the solenoid, so that the battery abnormality can be detected with high accuracy.

  Further, after the solenoid drive signal is turned on and a predetermined time elapses in the on state, an operation value calculated by the battery state determination unit is calculated from the battery voltage detected by the battery voltage detection unit and the solenoid current detected by the solenoid current detection unit. Since the battery state is determined and displayed in comparison with a predetermined value, the battery state can be determined based on the internal resistance of the battery, so that the battery state can be determined more accurately with respect to battery deterioration. An abnormality determination method for an injection device or a fuel injection device can be provided.

  The battery voltage is detected when the solenoid drive signal is off and after the solenoid drive signal is turned on and a predetermined time has elapsed, and the battery state is determined and displayed from the difference between the detected battery voltages. Since it did in this way, since the influence of the fluctuation | variation of the battery voltage at the time of solenoid non-energization can be removed and the fall of a battery voltage can be judged, more accurate judgment of a battery state is attained.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a fuel injection device of the present invention. The fuel injection device includes a fuel injection module 1 having a plunger-type electromagnetic drive pump that pumps fuel guided from a fuel tank (not shown) using electromagnetic force as a drive source, and an engine (not shown) in an operating state. Based on a control unit 2 that gives a drive signal to the fuel injection module 1, a generator 3 that is attached to the crankshaft of the engine and generates power by its rotation, a regulator 4 that optimally controls the generated voltage, and the generated power And a battery 5 for storing electricity.
The fuel injection module 1 has a solenoid 1a that electromagnetically drives a plunger (not shown). One end of the solenoid 1a is connected to a battery 5 via a diode 6 for preventing backflow, and the other end is connected to this circuit. The switching element is connected to the ground side via a solenoid driving FET 10 described later and a current detecting resistor 7.

  The control unit 2 has a microcomputer 8. When the microcomputer 8 calculates the amount of fuel to be injected based on an input from a sensor (not shown) and sends the calculation result to the solenoid drive control circuit 9, the solenoid drive control circuit 9 sends a solenoid drive signal to the solenoid drive FET 10. Send. As a result, the solenoid driving FET 10 is turned on / off, and the energization current of the solenoid 1a is turned on / off accordingly. When the energization current is on, the plunger of the fuel injection module 1 pressurizes the fuel and injects at a predetermined fuel pressure. When the energizing current is turned off, the plunger is pushed back by the spring and the fuel to be injected next is sucked. Thus, the plunger reciprocates, and the cycle of fuel suction, pressurization, injection, and stop is repeated.

Further, when the solenoid driving FET 10 is switched from on to off, the current flowing through the solenoid 1a is temporarily stored, and this electric energy can be used at the initial stage of the next solenoid driving so as to prevent backflow. 11, a capacitor 12, and a solenoid drive circuit including a discharge control circuit 13 that controls the discharge of the capacitor 12 and a discharge control FET 14. The discharge control circuit 13 receives a command from the microcomputer 8.
Furthermore, a solenoid current detection circuit 15 as a solenoid current detection means, a power supply detection circuit 16 as a battery voltage detection means, a display lamp drive circuit 17 as a display means, and a battery status display lamp 18 are provided. Further, the microcomputer 8 includes a battery state determination unit 8a described later.

  Next, the relationship between the on / off operation of the solenoid 1a of the fuel injection device configured as described above, the solenoid current, and the battery voltage will be described with reference to the drawings. 2A is a waveform diagram showing a solenoid drive signal, FIG. 2B is a solenoid current, and FIG. 2C is a waveform diagram showing a waveform of a battery voltage. The solid line in the figure indicates when the battery is normal, and the broken line indicates when the battery described later is abnormal. In addition, although the power generation ripple of a multipolar generator is superimposed on the actual battery voltage, the ripple is omitted in FIG. Further, it is assumed that the capacitor 12 has already been charged by the previous ON operation.

First, a normal control method will be described. A command from the microcomputer 8 is transmitted to the solenoid drive control circuit 9, and the solenoid drive FET 10 is switched from OFF to ON based on the command. The microcomputer 8 sends a signal to the discharge control circuit 13 simultaneously with the control command of the solenoid drive control circuit 9 to turn on the discharge control FET 14.
When the solenoid drive signal is turned ON in FIG. 2A, discharge is first started from the capacitor 12 toward the solenoid 1a. When the voltage of the capacitor 12 drops to the battery voltage Vb after the discharge time Td, the solenoid 1a then turns to the battery voltage. Driven by Vb, fuel is injected during the ON operation.
As shown in FIG. 2B, when a predetermined time Tr has elapsed after the solenoid 1a is driven, the solenoid current Is is detected by the solenoid current detection circuit 15, and a signal corresponding to the current value is sent to the microcomputer 8. Send. The microcomputer 8 calculates a correction value corresponding to the energization current and corrects the solenoid driving time.

In order to stop the fuel injection after a certain period of time, the microcomputer 8 issues a cutoff instruction to the solenoid drive FET 10 to cut off the solenoid current and simultaneously turn off the discharge control FET 14. Then, the electrical energy stored in the solenoid 1a at the time of interruption is stored in the capacitor 12 and used at the initial stage of the next solenoid drive.
In the above process, the battery voltage is as shown in FIG. While the solenoid current is flowing, it decreases slightly over time.

Next, the operation when the state of charge of the battery 5 is insufficient or the battery has deteriorated (hereinafter referred to as a battery abnormality) will be described.
As shown by a broken line in FIG. 2 (c), when the battery is abnormal, the current supply capability of the battery is lower than when it is normal, and the battery voltage is greatly reduced. Therefore, the battery voltage Vb1 after the predetermined time Tr has elapsed in the ON state (that is, while the solenoid 1a is energized) is turned on and detected by the power supply detection circuit 16 and taken into the microcomputer 8.

The predetermined time Tr is set to be longer than the discharge time Td of the capacitor 12 when the capacitor 12 temporarily stores the current flowing in the solenoid 1a as shown in FIG. While the capacitor 12 is being discharged, a high voltage is fed from the capacitor 12 to the solenoid 1a, so the voltage of the battery 5 cannot be accurately detected. This is because the battery voltage can be detected.
In the waveform diagram of FIG. 2, the on-time of the solenoid drive signal is longer when the battery is abnormal, because the power supply voltage is lower during the abnormality, so that the solenoid drive time is controlled to be longer. This is because.

  The detected battery voltage is filtered, and in a battery state determination means 8a in the microcomputer 8 (actually processed in software in the microcomputer 8), for example, within a predetermined time or a predetermined injection Among the number of times, the lowest voltage value is extracted from the several measured values, and when this voltage falls below a predetermined judgment voltage, it is judged as abnormal, and the microcomputer 8 instructs the display lamp drive circuit 17. Then, a drive signal in a predetermined pattern is sent to turn on or blink the battery state display lamp 18.

The battery status display lamp 18 may be shared by other warning or display lamps and distinguished by a display method. Further, the display means is not limited to the lamp, and may be displayed on a display, for example.
Further, the “predetermined determination voltage” is selected as a voltage that does not hinder driving due to an abnormality of the battery, and the battery state is not normal.

In the present invention, the reason why the battery voltage is detected while the solenoid is energized will be described.
It is also conceivable to detect the battery state from the battery voltage when the fuel injection module 1 is not driven, that is, when there is no load or when there is little load. For example, the battery voltage is detected when energization of the control unit is started by an ignition key. However, although there is a correlation between the battery voltage (open circuit voltage) in a state in which the battery is loaded and a state close to a no-load state, for example, in the case of a 12V battery in a state near a no-load state, the charge state In the range of 0 to 100%, the battery voltage changes only about 1V. In addition, when sulfation occurs on the battery electrode plate and the battery is in a deteriorated state, another correlation occurs between the battery voltage and the charged state, so the battery voltage (open voltage) is detected in a state close to a no-load state. The state of charge detected by is not accurate.

  On the other hand, when the battery voltage is detected while the solenoid is energized as in the invention of the present embodiment, the power generation capability of the generator is reduced particularly when the engine speed is low. Since there is a large difference in the amount of decrease in voltage, it is possible to detect the battery state with higher accuracy. Therefore, it is possible to accurately detect the battery state and accurately determine the battery abnormality.

  As described above, according to the embodiment of the present invention, after the solenoid drive signal is turned on and the predetermined time has elapsed in the on state, the battery voltage is detected by the battery voltage detection means, and the battery voltage is detected by the battery state determination means. The battery status is determined by comparing the value with the predetermined value, and the determination result is displayed on the display means. Therefore, the battery abnormality is determined based on the battery voltage during energization of the solenoid. Is possible. Therefore, it is possible to provide a fuel injection device that can accurately display battery abnormality and the like and can notify the user of abnormality before malfunction such as engine malfunction or engine stall occurs.

Embodiment 2. FIG.
Next, a fuel injection device according to Embodiment 2 will be described. The entire configuration is the same as that of FIG. For the waveform diagram, refer to FIG.
As shown in FIG. 2B, when the battery is abnormal, the solenoid current Is is also lower than when it is normal. Therefore, the fuel injection device in the present embodiment detects this solenoid current Is and uses it to determine the battery state.

  That is, after the drive signal of the solenoid 1a is turned on and a predetermined time Tr elapses, the solenoid current Is is detected by the solenoid current detection circuit 15 which is solenoid current detection means, and the solenoid current is compared with a predetermined value by the battery state determination means 8a. To determine the battery status. The microcomputer 8 transmits the result to the display lamp driving circuit 17 and commands the battery status display lamp 18 to be driven. Thereby, the battery state display lamp 18 is lit or blinked, and the current battery state can be known.

Furthermore, another fuel injection device according to this embodiment will be described.
In general, the internal resistance of a battery increases with deterioration, and the correlation between the increase in internal resistance and battery deterioration is higher than the correlation between open-circuit voltage and deterioration. Detection is possible.
Therefore, after the solenoid drive signal is turned on and the predetermined time Tr has elapsed in the on state, the power supply detection circuit 16 detects the battery voltage Vb, and the solenoid current detection circuit 15 detects the solenoid current Is at the same timing. The microcomputer 8 calculates the value corresponding to the resistance component from the battery voltage Vb and the solenoid current Is by the battery state determination means 8a, compares the calculated value with a predetermined reference value, and if the reference value is exceeded. It is determined that the battery is abnormal.
Note that the comparison is not necessarily limited to the resistance component, and for example, the product of the voltage and the current may be compared with a predetermined reference value, and any one that can be calculated from the battery voltage Vb and the solenoid current Is may be used. .

  In the detection of the solenoid current according to the present embodiment, the solenoid current detection circuit 15 provided in the control unit 2 is originally used for correcting the drive pulse width for improving the accuracy of the fuel injection amount of the fuel injection module 1. That's fine. The timing for detecting the solenoid current after the predetermined time Tr has elapsed after the solenoid drive signal is turned on (that is, the length of the predetermined time Tr) is also the same timing as the current detection timing for correcting the drive pulse width. If so, the calculation load of the microcomputer 8 can be reduced.

  As described above, according to the present embodiment, the solenoid drive signal is turned on and the solenoid current is detected by the solenoid current detection means after a predetermined time has elapsed in the on state, and is detected by the battery state determination means. Since the battery current is determined by comparing the solenoid current with a predetermined value and the determination result is displayed on the display means, the battery abnormality is determined by the solenoid current during energization of the solenoid. The battery state can be detected with high accuracy.

  Also, after the solenoid drive signal is turned on and a predetermined time has elapsed in the on state, the battery voltage detecting means detects the battery voltage, the solenoid current detecting means detects the solenoid current, and the battery state determining means detects the battery voltage and the solenoid current. Since the battery state is determined by comparing the calculated value calculated from the above with a predetermined value and the determination result is displayed on the display means, it is possible to determine the battery state based on the internal resistance of the battery, and against the battery deterioration. The battery state can be determined with higher accuracy. Accordingly, it is possible to provide a fuel injection device that can accurately display battery abnormality and the like, and can notify the user of abnormality before a malfunction such as engine malfunction or engine stall occurs, and an abnormality determination method for the fuel injection device.

  In addition, if the timing for detecting the solenoid current after a predetermined time has elapsed is matched with the detection timing of the solenoid current detected for correcting the drive pulse width in order to improve the fuel injection amount accuracy of the fuel injection module, The calculation load of the computer is reduced, the calculation speed is increased, and application to a higher engine speed is possible.

Embodiment 3 FIG.
Next, a fuel injection device according to Embodiment 3 will be described. Since the entire configuration and waveform diagram are the same as those in FIGS. 1 and 2 of the first embodiment, description thereof is omitted.
In order to determine the state of the battery, the battery voltage and / or the solenoid current is detected while the solenoid is energized, as in the first or second embodiment. Therefore, the following description will focus on the differences from the invention of the first embodiment or the second embodiment.

The difference is the timing of detecting the battery voltage and / or the solenoid current, that is, the length of the predetermined time Tr shown in FIG. The predetermined time Tr is a length from when the solenoid drive signal is turned on to just before it is turned off. That is, it is detected at a timing immediately before turning off. As can be seen from the waveform diagram of FIG. 2, the difference between the normal time and the abnormal time is greater immediately before turning off. By doing in this way, the value near the time (Vb2) when the battery voltage has dropped most in the drive cycle is detected, and the accuracy of the battery state determination is improved.
In addition, when detecting just before solenoid energization interruption in this way, the accuracy of detection is further improved by setting the determination value according to the energization pulse width.

  As described above, according to the present embodiment, the detection timing of the battery voltage and / or solenoid current after a predetermined time has passed is immediately before the solenoid drive signal is turned off. The battery voltage difference at the time increases, and the battery state can be determined with higher accuracy.

Embodiment 4 FIG.
Next, a fuel injection device according to Embodiment 4 will be described. Since the entire configuration and waveform diagram are the same as those in FIGS. 1 and 2 of the first embodiment, description thereof is omitted.
As shown in the waveform diagram of the battery voltage in FIG. 2C, in this embodiment, when energization is commanded to the solenoid, the battery voltage Vb0 when the solenoid drive signal is OFF and the battery voltage after a predetermined time has elapsed. Vb1 is detected by the power supply detection circuit 16, and the battery state determination means 8a obtains the voltage drop ΔVb = Vb0−Vb1, and compares it with a predetermined value to determine the battery state. The rest is the same as in the first embodiment.
In this method, the battery state can be determined by a voltage drop due to solenoid driving without depending on other electric load states such as a light, so that the determination accuracy is further improved.

  As described above, according to the invention of this embodiment, the battery voltage when the solenoid drive signal is off and the battery voltage after the solenoid drive signal is turned on and after a predetermined time has elapsed in the on state are displayed. Since the battery state is detected by the detection means, the battery state determination means compares the detected battery voltage with a predetermined value to determine the battery state, and the determination result is displayed on the display means. Since it is possible to determine the decrease in the battery voltage by removing the influence of the voltage fluctuation, it is possible to more accurately determine the battery state.

  In the first to fourth embodiments, immediately after the solenoid drive signal is turned off, the power stored in the solenoid is temporarily stored in the capacitor, and the solenoid is discharged to the solenoid when the next solenoid drive signal is turned on. In the above description, the drive circuit is provided, and the predetermined time after the solenoid drive signal is turned on is set longer than the time when the capacitor discharge is completed. The present invention can also be applied to a fuel injection device that does not include the solenoid drive circuit as described above. However, when the solenoid drive circuit is provided, the capacitor discharge is performed by setting the predetermined time as described above. Sometimes, the battery voltage can be detected without being affected by the voltage fluctuation when the voltage is supplemented to the solenoid, and the battery state can be determined more accurately.

It is a block diagram of the fuel-injection apparatus in Embodiment 1- Embodiment 4 of this invention. It is a wave form diagram of a solenoid drive signal, solenoid current, and battery voltage in Embodiment 1 to Embodiment 4 of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel injection module 1a Solenoid 2 Control unit 3 Generator 4 Regulator 5 Battery 6,11 Diode 7 Current detection resistance 8 Microcomputer 8a Battery state determination means 9 Solenoid drive control circuit 10 Solenoid drive FET
12 Capacitor 13 Discharge Control Circuit 14 Discharge Control FET 15 Solenoid Current Detection Circuit 16 Power Supply Detection Circuit 17 Display Lamp Drive Circuit 18 Battery Status Display Lamp

Claims (7)

A fuel injection module having a function of reciprocating the plunger by turning on and off the current to the solenoid to suck and pressurize and inject the fuel; and a control unit for supplying a drive signal to the fuel injection module based on the operating state of the engine; In a fuel injection device comprising a generator for generating electricity by rotation of the engine and a battery for storing electric power,
Immediately after the drive signal of the solenoid is turned off, the power stored in the solenoid is temporarily stored in a capacitor, and when the drive signal is turned on next time, a solenoid drive circuit that discharges to the solenoid, battery voltage detection means, A battery state determination means in the control unit ,
Above hear motion signal is turned on turned on, after a predetermined time which the discharge is completed the time longer than setting of the capacitor is passed to detect the battery voltage by the battery voltage detecting means, the battery voltage by the battery state determining means A fuel injection device characterized in that the battery state is determined by comparing the value with a predetermined value and the determination result is displayed on the display means. A fuel injection module having a function of reciprocating the plunger by turning on and off the current to the solenoid to suck and pressurize and inject the fuel; and a control unit for supplying a drive signal to the fuel injection module based on the operating state of the engine; In a fuel injection device comprising a generator for generating electricity by rotation of the engine and a battery for storing electric power,
Immediately after the drive signal of the solenoid is turned off, the power stored in the solenoid is temporarily stored in a capacitor, and when the drive signal is turned on next time, a solenoid drive circuit that discharges to the solenoid, solenoid current detection means, A battery state determination means in the control unit ,
In becomes the ON state over the ineffective motion signal is turned on after a predetermined time discharge is completed time longer than setting of the capacitor elapsed, detects the solenoid current by the solenoid current detecting means, the solenoid current by the battery state determining means A fuel injection device characterized in that the battery state is determined by comparing the value with a predetermined value and the determination result is displayed on the display means. A fuel injection module having a function of reciprocating the plunger by turning on and off the current to the solenoid to suck and pressurize and inject the fuel; and a control unit for supplying a drive signal to the fuel injection module based on the operating state of the engine; In a fuel injection device comprising a generator for generating electricity by rotation of the engine and a battery for storing electric power,
Immediately after the drive signal of the solenoid is turned off, the power stored in the solenoid is temporarily stored in a capacitor, and when the drive signal is turned on next time, a solenoid drive circuit for discharging to the solenoid, battery voltage detection means, , Having a solenoid current detection means and a battery state determination means in the control unit ,
In becomes the ON state over the ineffective motion signal is turned on after a predetermined time discharge is completed time longer than setting of the capacitor elapsed, the solenoid current by the solenoid current detecting means detects a battery voltage by the battery voltage detecting means The battery state determining means detects the battery state by comparing the calculated value calculated from the battery voltage and the solenoid current with a predetermined value, and the determination result is displayed on the display means. A fuel injection device.   4. The fuel injection device according to claim 2, wherein the solenoid current is detected when the predetermined time has elapsed to detect a drive pulse width in order to improve the accuracy of the fuel injection amount of the fuel injection module. A fuel injection device characterized by being matched with a detection timing of the solenoid current.   4. The fuel injection device according to claim 1, wherein the timing of detecting the battery voltage or the solenoid current after the predetermined time has elapsed is immediately before the drive signal of the solenoid is turned off. A fuel injection device. A fuel injection module having a function of reciprocating the plunger by turning on and off the current to the solenoid to suck and pressurize and inject the fuel; and a control unit for supplying a drive signal to the fuel injection module based on the operating state of the engine; In a fuel injection device comprising a generator for generating electricity by rotation of the engine and a battery for storing electric power,
Immediately after the drive signal of the solenoid is turned off, the power stored in the solenoid is temporarily stored in a capacitor, and when the drive signal is turned on next time, a solenoid drive circuit for discharging to the solenoid, battery voltage detection means, A battery state determination means in the control unit ,
By the battery voltage detecting means, and the battery voltage when the upper hear motion signal is off, the upper hear motion signal is turned on, the battery voltage after elapse of a predetermined time discharge is completed time longer than setting of the capacitor and A fuel injection device characterized in that the battery state determination means obtains a difference between the two battery voltages and compares it with a predetermined value to determine the battery state, and the determination result is displayed on the display means. A fuel injection module having a function of reciprocating the plunger by turning on and off the current to the solenoid to suck and pressurize and inject the fuel; and a control unit for supplying a drive signal to the fuel injection module based on the operating state of the engine; In the abnormality determination method of the fuel injection device provided with a generator that generates electric power by rotating the engine and a battery that stores electric power,
Immediately after the drive signal of the solenoid is turned off, the power stored in the solenoid is temporarily stored in a capacitor, and when the drive signal is turned on next time, a solenoid drive circuit that discharges to the solenoid, battery voltage detection means, , Having a solenoid current detection means and a battery state determination means in the control unit ,
In becomes the ON state over the ineffective motion signal is turned on after a predetermined time discharge is completed time longer than setting of the capacitor elapsed, the solenoid current by the solenoid current detecting means detects a battery voltage by the battery voltage detecting means A fuel characterized in that a battery state is detected by the battery state determination means, a battery state is determined by comparing a calculated value calculated from the battery voltage and the solenoid current with a predetermined value, and the determination result is displayed on the display means. An abnormality determination method for an injection device.

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