JP3201285B2 - Fuel injection timing adjustment device for fuel injection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection timing adjusting device for a fuel injection device which detects a deviation amount between a real position and a reference position of a timer piston provided in a timer mechanism and corrects a fuel injection start timing. .

[0002]

2. Description of the Related Art In a diesel engine, only air is introduced into a cylinder, fuel is injected into compressed high-pressure, high-temperature compressed air, and explosive combustion is caused by spontaneous ignition. Therefore, the compression time of the air in the cylinder is shortened in accordance with the increase in the engine speed, and it is necessary to adjust the injection timing of the fuel in the cylinder. Therefore, an injection pump having a fuel injection timing adjusting device is used.

[0003] Such an injection pump adjusts the fuel injection timing by controlling the position of a timer piston in accordance with the rotation speed of the engine by an automatic timer. In addition, the operating performance of the injection pump varies within a certain range due to a manufacturing error of the parts and an assembly error when assembling using these parts.

Therefore, there is a difference between the actual position of the timer piston measured by the timer piston sensor and the reference position corresponding to the rotation speed of the engine, and it is necessary to correct this difference. Methods and devices are known. An injection timing adjusting device for an electronic fuel injection device disclosed in Japanese Patent Application Laid-Open No. 6-159125 is one of them.

In this conventional example, when the injection pump is operated for the first time, the actual position of the timer piston is detected, the deviation of the actual position from the reference position is learned, and this learned value is stored. Thereafter, the timing control valve is controlled in consideration of the learning value, and the actual position of the timer piston is corrected to adjust the fuel injection timing.

Therefore, if the deviation is first learned and stored, the engine can be started thereafter without learning. However, there is a case where the learning value becomes inappropriate due to aging, and a learning check processing means for updating the learning value based on a condition that the learning is completed is provided in such a case.

[0007]

However, in the above conventional example, the learning process is executed only when the engine switch is first turned on. The required learning time requires a time of 0.6 to 0.7 sec, the startability is slow, giving the driver an uncomfortable feeling, and the learning value is stored by one learning, and thereafter the learning value is stored. , The actual position of the timer piston is corrected, so that the learning value is not stable in one learning and is often insufficient.

Further, in the above-mentioned conventional example, learning check processing means is introduced in order to cope with aging of the timer piston sensor. However, this means that arithmetic processing is performed based on the condition that learning has been completed. This is done, and it is not determined in advance whether it has actually passed. Therefore, this step is performed whether or not the correction value of the actual position of the timer piston needs to be updated, so that even if it is sufficient to correct the fuel injection timing with the learning value once stored, there is no waste. The correction value will be updated, and
Also in this case, when the engine switch is turned on, the learning update processing is executed, similarly, the startability is slow, which gives the driver a sense of incongruity, and a single update value is obtained to obtain the learning value. To update, so this too
The learning value for updating is often unstable and not stable.

In view of the above-mentioned circumstances, an object of the present invention is to provide a fuel injection timing adjusting device for a fuel injection device in which a learning process is not executed when an engine switch is turned on, so that startability of the engine is not delayed. That is. Another object of the present invention is to provide a fuel injection timing adjusting device for a fuel injection device, which detects a secular change and updates a learning value when the detected value is equal to or more than a predetermined value. Another object of the present invention is to provide a fuel injection timing adjusting device for a fuel injection device, which calculates a learning value a plurality of times and stores the lesser learning value as the latest learning value.

[0010]

According to a first aspect of the present invention, there is provided a fuel injection device for detecting a deviation between an actual position of a timer piston provided in a timer mechanism and a reference position and correcting a fuel injection start timing. In the fuel injection timing adjustment device, while the engine changes from the operating state to the stopped state, a learning value calculating unit that calculates the deviation amount as a learning value is compared with the learning value up to the previous time and the current learning value. Storage means for storing a value that is not large as the latest learning value, and timer control means for controlling the timer mechanism based on the value of the storage means to correct the position of the timer piston and determine the fuel injection timing. And characterized in that:

In the fuel injection device according to the first aspect of the invention, the engine is changed from the operating state to the stopped state by the learning value calculating means 1a (FIG. 1) using the deviation amount between the actual position of the timer piston and the reference position as the learning value. Learn and remember while doing. Specifically, since the number of times of learning up to the previous time is stored, it is already determined whether the number of times of learning is less than a predetermined value while the vehicle is traveling. Therefore, when the vehicle is stopped and the ignition switch is turned off, learning is performed. I will be remembered.

Since the first aspect of the present invention is constructed as described above, the learning is stored in the vehicle assembly factory by turning on the ignition switch to start the engine and stopping the engine after idling. And after that, it learns several times every time the engine is stopped,
The learning value is updated and stored, and thereafter, the fuel injection timing is determined based on the stored learning value. When the ignition switch is turned on, the learning process is not executed. Therefore, the startability of the engine is not delayed, and the driver does not feel uncomfortable.

In the first invention, a value which is not large compared with the previous learning value and the current learning value is stored as the latest learning value. At the time of this learning, it is necessary to once drain the fuel in the timer piston to empty it. If the fuel drain is insufficient, the learned value is calculated to be high.However, by comparing the learned value up to the previous time and the current learned value, the value that is not large is set as the latest learned value, and the calculation error is eliminated as much as possible can do.

According to a second aspect of the present invention, there is provided a fuel injection timing adjusting device for an electronic fuel injection device for detecting a deviation amount between a real position and a reference position of a timer piston provided in a timer mechanism and correcting the fuel injection start timing. In the above, while the engine changes from the operating state to the stopped state, a learning value calculating means for calculating the deviation amount as a learning value, a physical quantity that increases in association with an increase in the driving time of the engine, or an artificial or A storage means for storing a measured value of the number of mechanical operations up to the previous time, and comparing a learned value up to the previous time with the current learned value and storing a value which is not large as a latest learned value; Timer control means for controlling the timer mechanism based on the value and correcting the position of the timer piston to determine the fuel injection timing; and when the measured value has reached a predetermined value or more. Characterized by comprising a learning value calculation executing means for executing the learning value calculation means.

According to the second aspect of the present invention, the learning value calculating means 1a (FIG. 1) calculates the deviation between the actual position of the timer piston and the reference position as a learning value under the control of the learning value calculation executing means 1c. The learning value obtained by comparing the learning value up to the previous time with the current learning value is stored as the latest learning value. The timer mechanism is controlled based on the learning value of the storage means to correct the position of the timer piston and determine the fuel injection timing.

Further, as shown in FIGS. 3, 4, and 5, the second invention provides a physical quantity (for example, a traveling distance or the like) that increases in association with an increase in the driving time of the engine, or the driving of the engine. An increase in the number of man-made or mechanical operations associated with an increase in time (for example,
Alternatively, the measured value up to the previous time (OFF or ON-OFF count, gas tank injection count, etc.) is stored, and when the measured value has reached a predetermined value or more, the learned value calculation means is executed.

As described above, according to the second aspect of the present invention, the learning is performed when the physical quantity or the number of operations is equal to or more than a predetermined value. Is corrected, and the learning value can be updated according to the aging of the vehicle.

Further, the storage means stores the number of engine stops which has been changed from the operating state of the engine to the stopped state up to the previous time, and when the number of engine stops has reached a predetermined value or more, the learning value is stored. A configuration for executing the arithmetic means is also an effective means of the second invention.

In the second aspect of the present invention, since the learning is performed when the vehicle is stopped and the ignition switch is turned off, the OFF signal needs to be input by the CPU, and the OFF signal is stored in the storage means 17. Then, when the number of engine stops has reached a predetermined value (the number of times to be considered as aging, for example, 1000 times), the learning value calculation means is executed to update the learning value.
Therefore, the age can be detected by sharing the OFF signal of the ignition switch without using another detection signal.

In both the first invention and the second invention, it is effective that the learning operation means is configured to be executed when the number of times of learning is less than a predetermined value.

With this configuration, it is necessary to initialize the learning value at the factory, or to reset the learning value when the battery is replaced, or to update the learning value over time. In such cases, the learning value is set once and not learned until the aging is updated with that value. Rather, the learning is performed several times each time the ignition switch is turned off at the time of initial setting or updating, and the larger of them is performed. Missing values are updated and stored as the latest values.

Therefore, even if the first learning value includes an error, the learning value is updated every time the ignition switch is turned off until the number of learning times satisfies a predetermined value (for example, three times). The performed optimum value is stored as a learning value, and the timer is controlled by that value until the aging update.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified.
It is only an illustrative example.

FIG. 1 shows a block diagram of a fuel injection timing adjusting device of a fuel injection device according to an embodiment of the present invention. The CPU (central processing element) 1 is a learning value calculating means 1
a, a timer control means 1b, a learning value calculation execution means 1c for controlling the learning value calculation means 1a, and other calculation control means for receiving signals from various sensors and mechanisms to be described later and controlling the mechanisms and the like. I have.

The traveling distance sensor 2 detects the traveling distance of the vehicle, and the fuel tank opening / closing sensor 3 detects the amount of fuel or the number of times the tank inlet is opened and closed each time fuel is supplied to the tank. , The ignition switch mechanism 4 is for turning the ignition switch ON and OFF.
A signal is sent to the CPU 1 and the motor 5 for starting the engine is started.
It is stored in the storage means 17 by U1.

The CPU 1 detects an idle state after the engine is started or a state in which the accelerator is depressed.
6 are connected.

The CPU 1 further includes a water temperature sensor 6, a rotation sensor 7 for detecting the number of revolutions of the engine, and a sleeve position of a sleeve for controlling the fuel injection amount of the injection pump in order to exchange various signals with the engine and the fuel injection pump. Sensor 8, engine fuel temperature sensor 9, fuel cut valve 10 for cutting off fuel supply when the engine is stopped, electronic governor 11 for controlling the injection pump, electronic control timing control valve 12 for controlling the fuel injection timing, timer piston position Piston position sensor 1 for measuring
3 are connected.

FIG. 2 is a diagram showing characteristics of an injection pump (injection pump I / P) timer. In the production stage, the timer advance angle in the design and the output of the timer position sensor vary between the upper limit Tu and the lower limit Ti in the production stage as shown in FIG. Therefore, the timer characteristic T of the product is shifted from the reference timer characteristic Ts by the shift amount E in the sensor output with respect to the reference timer advance. Therefore, it is necessary to adjust the injection timing by correcting the deviation E.

Next, the operation of the embodiment using such an injection pump will be described. In FIG. 1, the accelerator 15
When the ignition switch 4 is turned on without stepping on the engine, the engine starts and the idle switch 14 is closed, so that the engine is rotationally driven in an idle state. Since the accelerator is not depressed, the fuel injection timing is not corrected.

FIG. 3 is a flowchart according to the first embodiment. In the figure, during the operation state (100), the CPU 1 waits in the next three states. (A) When the number of times of learning is less than a predetermined value (for example, three times) (101), the process waits until the ignition switch 4 sends an OFF signal. (B) When the number of times of learning is equal to or more than a predetermined value and the cumulative number of times that the ignition switch 4 is turned off is less than a predetermined value (for example, 1000 times) (102), the ignition switch 4 sends an OFF signal. Wait until you do. (C) When the number of times of learning is equal to or more than a predetermined value, and when the cumulative number of times that the ignition switch 4 is turned off is equal to or more than a predetermined value (for example, 1000 times), the memory of the cumulative number of ON-OFF times of the ignition switch is cleared. (10
3) and clear the memory of the cumulative number of times of learning (1
04) and wait.

In the state (a), when the ignition switch 4 is turned off (105), 1 is added to the cumulative number of times the ignition switch is turned on and off and stored. If the previous ON-OFF cumulative number is 0, the cumulative number is stored as 1.

When the CPU 1 receives the ignition OFF signal, the CPU 1 closes the fuel cut valve 10 to stop the supply of fuel, and injects the fuel in the timer piston into the cylinder of the engine via the electronic control timing control valve 12. Upon completion, the fuel in the timer piston becomes empty, and the timer piston position data at that time is received by the sensor 13.

The CPU 1 fully closes the electronic control timing control valve 12, detects the actual position of the timer piston at the most retarded position of the timer piston, detects the amount of deviation from the reference position, and obtains a correction amount. (107),
One is added to the number of times of learning and stored (108).

The engine is stopped (109), and it is determined whether or not the previous learning value is stored (110). If not, the learning value is stored. If the previous learning value is stored, the previous learning value is compared with the current learning value, and the smaller value is stored as the latest learning value (112).

The engine is started again, and step 10 is started.
By repeating the states 5 to 112, the number of times of learning increases one by one, and the learning value up to the previous time and the current learning value are compared, and a value which is not larger is stored as the latest learning value (112). . By repeating this a plurality of times, errors are eliminated as much as possible, and correct learning values are updated.

When the number of times of learning reaches a predetermined value or more,
The cumulative number of times that the ignition switch 4 is turned off is compared with a predetermined value. If the cumulative number of times that the ignition switch 4 is turned off is less than a predetermined value (for example, 1000) (102), the state of (b) is reached. , And waits until the ignition switch 4 sends an OFF signal.

When the ignition switch 4 is turned off (114), 1 is added to the cumulative number of times of ignition switch ON-OFF and stored (115). Thereafter, until the cumulative number of times of ignition switch ON-OFF becomes more than a predetermined value. That is, the fuel injection is controlled (113) using this stored learning value until the number of times the learning value needs to be updated due to aging.

When the cumulative number of times of ignition switch ON-OFF exceeds a predetermined value, the state (c) is reached, and the memory of the cumulative number of times of ignition switch ON-OFF is cleared (103) and the memory of the cumulative number of times of learning is cleared ( 104) Then, it waits until the OFF signal of the ignition switch is received.

When the ignition switch 4 is turned off (105), 1 is added to the cumulative number of times the ignition switch is turned on and off and stored. If the previous ON-OFF cumulative number is 0, the cumulative number is stored as 1.

Thereafter, the timer piston detects the actual position of the timer piston at the most retarded position, detects the amount of deviation from the reference position, obtains a correction amount (107), and adds 1 to the number of times of learning. It is stored (108). Engine stopped (1
09), and if the learning value up to the previous time is stored (11)
0), the learning value up to the previous time is compared with the current learning value, and a value that is not larger is stored as the latest learning value (11).
2) It is done.

Then, the engine is started again, and the states of steps 105 to 112 are repeated, so that the number of times of learning increases by one, and the learning value up to the previous time is compared with the current learning value, and one of them is not larger. The value is stored (112) as the most recent learned value. By repeating this a plurality of times, errors are eliminated as much as possible, and correct learning values are updated.

As described above, according to the first embodiment,
The fuel injection device according to the present embodiment has a learning value calculating means 1a.
The shift amount between the actual position and the reference position of the timer piston is learned and stored as a learning value from FIG. 1 while the engine changes from the operating state to the stopped state. Specifically, since the number of times of learning up to the previous time is stored, it is determined whether the number of times of learning is already less than a predetermined value during traveling,
When the vehicle is stopped and the ignition switch is turned off, learning is performed and stored.

With this configuration, in the vehicle assembly factory, learning is stored by turning on the ignition switch to start the engine and stopping the engine after idling. After that, learning is performed a plurality of times each time the engine is stopped, and the learning value is updated and stored. After that, the fuel injection timing is determined based on the stored learning value, and when the ignition switch is turned on, the learning process is not executed. Therefore, the startability of the engine is not delayed, and the driver does not feel uncomfortable.

In the first embodiment, a value that is not large compared with the previous learning value and the current learning value is stored as the latest learning value. At the time of this learning, it is necessary to once drain the fuel in the timer piston to empty it. If the fuel drain is insufficient, the learned value is calculated to be high.However, by comparing the learned value up to the previous time and the current learned value, the value that is not large is set as the latest learned value, and the calculation error is eliminated as much as possible can do.

In the first embodiment, the number of engine stops up to the previous time is stored, and when the number of engine stops has reached a predetermined value or more, the learning value calculating means is executed. Therefore, the ignition switch OFF signal, which is a condition for the learning value calculation, is stored in the storage unit 17, and the number of engine stops is set to a predetermined value (the number of times to be considered as aging, for example, 1000).
Times), the learning value calculating means can be used to execute the learning value calculation means and update the learning value, and can share the OFF signal of the ignition switch without using another detection signal. Aging can be detected and C
The burden on the PU can be reduced.

Next, a second embodiment will be described. First
The difference between the second embodiment and the second embodiment is that the first embodiment uses the cumulative number of times of ignition switch ON-OFF comparison with a predetermined value to update the learning value in consideration of aging. The second embodiment is that the traveling distance of the vehicle is compared with a predetermined value and is used for updating a learning value in consideration of aging.

FIG. 4 is a flowchart according to the second embodiment. In the figure, during the operation state (150), the CPU 1 waits in the following three states. (A) When the number of times of learning is less than a predetermined value (for example, three times) (151), the process waits until the ignition switch 4 sends an OFF signal. (B ') If the number of times of learning is equal to or more than a predetermined value and the accumulated distance of the traveling distance is less than a predetermined value (for example, 5000 km) (152), the process waits until the ignition switch 4 sends an OFF signal. . (C ') When the number of times of learning is equal to or more than a predetermined value, and when the cumulative distance of the traveling distance is equal to or more than a predetermined value (for example, 5000 km), the memory of the number of times of learning is cleared (153) and the apparatus stands by.

In the state (a), the steps 155, 156, 157, 158, 159, 160 and 161 after the step 154 in which the ignition switch is turned off, and the steps 105, 10 and 161 of the first embodiment.
6, 107, 108, 109, 110, 111, 112
And 113, and the description is omitted.

When the number of times of learning reaches a predetermined value or more,
The cumulative distance of the travel distance is compared with a predetermined value. If the cumulative distance of the travel distance is less than a predetermined value (for example, 5000 km) (152), the state (b ') is set, and the ignition switch 4 is turned off. Wait until sending out.

When the ignition switch 4 is turned off (162), thereafter, the stored learning value is maintained until the cumulative running distance becomes a predetermined value or more, that is, until the cumulative distance for which the learning value needs to be updated due to aging. The fuel injection is controlled (161) using the value.

When the cumulative distance of the running distance exceeds a predetermined value, the state (c ') is reached, the memory of the cumulative number of times of learning is cleared (153), and the operation waits until the OFF signal of the ignition switch is received. .

When the ignition switch 4 is turned off (154), the timer piston detects the actual position of the timer piston at the most retarded position, detects the amount of deviation from the reference position, and obtains the amount of correction (155). One is added to the number of times and stored (156). Engine stopped (157)
If the previous learning value is stored (15
8) Compare the previous learning value with the current learning value, and store the smaller value as the latest learning value (16)
1) is done.

Then, the engine is started again, and the states of steps 154 to 160 are repeated, so that the number of times of learning increases by one, and the learning value up to the previous time and the current learning value are compared, and one of them is not larger. The value is stored (160) as the most recent learned value. By repeating this a plurality of times, errors are eliminated as much as possible, and correct learning values are updated.

Next, a third embodiment will be described. First
The difference between the second embodiment and the second embodiment is that the first embodiment uses the cumulative number of times of ignition switch ON-OFF comparison with a predetermined value to update the learning value in consideration of aging. The third embodiment is characterized in that the cumulative amount of fuel injected into the gas tank of the vehicle or the cumulative count of the cumulative number of times is compared with a predetermined value and used to update the learning value in consideration of aging.

FIG. 5 is a flowchart according to the third embodiment. In the figure, during the operation state (200), the CPU 1 waits in the following three states. (A) When the number of times of learning is less than a predetermined value (for example, three times) (201), the process waits until the ignition switch 4 sends an OFF signal. (B ″) When the number of times of learning is equal to or more than a predetermined value, and the cumulative amount of fuel injected into the tank or the cumulative count of the cumulative number of times is a predetermined value (for example, 50,000 liters or 100
If it is less than 0 times (202), it waits until the ignition switch 4 sends an OFF signal. (C ″) When the number of times of learning is equal to or more than a predetermined value, and when the accumulation of the counted amount of the gas tank is equal to or more than a predetermined value, the memory of the number of times of learning is cleared (203) and the process stands by.

In the state (a), the steps 205, 206, 207, 208, 209, 210, and 211 after the step 204 when the ignition switch is turned off and the steps 105, 10 and 211 of the first embodiment.
6, 107, 108, 109, 110, 111, 112
And 113, and the description is omitted.

When the number of times of learning becomes equal to or more than a predetermined value,
The cumulative value of the counting amount of the gas tank is compared with a predetermined value, and if the cumulative value of the counting amount is less than the predetermined value, (2
02), the state of (b ″) is reached, and the apparatus stands by until the ignition switch 4 sends an OFF signal.

When the ignition switch 4 is turned off (212), thereafter, the stored values are stored until the accumulated value of the counted amount becomes a predetermined value or more, that is, until the learning value needs to be updated due to aging. The fuel injection is controlled (211) using the learning value.

When the cumulative value of the counted amount becomes a predetermined value or more, the state (c ″) is reached, the memory of the cumulative learning number is cleared (203), and the operation waits until the OFF signal of the ignition switch is received. I do.

When the ignition switch 4 is turned off (204), the timer piston detects the actual position of the timer piston at the most retarded position, detects the amount of deviation from the reference position, and obtains a correction amount (205). One is added to the number of times and stored (206). Engine stopped (207)
When the previous learning value is stored (208), the previous learning value is compared with the current learning value, and a value that is not larger is stored as the latest learning value (210).

Then, by restarting the engine and repeating the states of steps 204 to 210, the number of times of learning increases by one, and the learning value up to the previous time is compared with the current learning value. The value is stored (210) as the most recent learned value. By repeating this a plurality of times, errors are eliminated as much as possible, and correct learning values are updated.

As described above, in the first, second, and third embodiments, the learning value calculation means 1a (FIG. 1) determines the amount of deviation between the actual position of the timer piston and the reference position by executing the learning value calculation. The learning value is calculated as a learning value under the control of the means 1c, and a value which is not large by comparing the learning value up to the previous time with the current learning value can be grasped as a mode of storing as the latest learning value. The timer mechanism is controlled based on the learning value of the storage means to correct the position of the timer piston and determine the fuel injection timing.

In the first, second, and third embodiments, as shown in FIGS. 3, 4, and 5, a physical quantity (for example, a traveling distance) that increases in association with an increase in the driving time of the engine is used. Etc.) or an increase in the number of artificial or mechanical operations associated with an increase in the operating time of the engine (e.g., ON or OFF or ON-O of an ignition switch)
The stored values of the FF count, the tank filling count, etc. up to the previous time are stored, and when the measured value has reached a predetermined value or more, the learning value calculating means is executed.

As described above, in the first, second and third embodiments, the learning is executed when the physical quantity or the number of operations is equal to or more than a predetermined value. The fuel injection timing is corrected by the stored learning value,
The learning value can be updated according to the aging of the vehicle.

In all of the first, second, and third embodiments, the learning operation means is configured to be executed when the number of times of learning is less than a predetermined value. Initial settings at the factory, or if the learning value is configured to be reset when the battery is replaced, or if it is necessary to update the learning value over time, etc. Rather than learning with the value over time, it is performed several times each time the ignition switch is turned off at the time of initial setting or updating, and the smaller value is updated and stored as the latest value.

Therefore, even if the first learning value includes an error, the learning value is updated every time the ignition switch is turned off until the number of times of learning satisfies a predetermined value (for example, three times). The performed optimum value is stored as a learning value, and the timer is controlled by that value until the aging update.

At the time of the learning calculation, it is desirable to carry out the learning at a certain temperature or higher in order to prevent erroneous learning. It is desirable to provide a means for eliminating values.

[0068]

As described above, according to the present invention, when the engine switch is turned on, the learning process is not executed, and the learning process is executed after the engine switch is turned off. To provide a fuel injection timing adjustment device for a fuel injection device that eliminates learning errors as much as possible in order to ensure good startability and store the lesser learning value among a plurality of learning values as a recent learning value. can do.

Further, a physical quantity (for example, a traveling distance) that increases in association with an increase in the driving time of the engine or an artificial or mechanical operation (for example, a number of times that increases in association with an increase in the driving time of the engine) While storing the measured values of the ignition switch ON or OFF or the number of ON-OFF, the number of times of tank filling, etc.
By configuring the learning value calculating means to be executed when the measured value has reached a predetermined value or more, it is possible to provide a fuel injection timing adjusting device of a fuel injection device which can cope well with aging. .

[Brief description of the drawings]

FIG. 1 is a block configuration diagram according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram of an injection pump used in the embodiment of the present invention.

FIG. 3 is a flowchart illustrating an operation according to the first embodiment of the present invention.

FIG. 4 is a flowchart illustrating an operation according to a second embodiment of the present invention.

FIG. 5 is a flowchart illustrating an operation according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CPU (Central processing element) 2 Mileage sensor 3 Fuel tank opening / closing sensor 4 Ignition switch mechanism 5 Engine starting motor 6 Water temperature sensor 7 Rotation sensor (engine rotation sensor) 8 Sleeve position sensor 9 Fuel temperature sensor 10 Fuel cut valve 11 Electronic governor 12 Electronic control timing control valve 13 Timer piston position sensor

Claims (4)

(57) [Claims] 1. A fuel injection timing adjusting device for a fuel injection device, which detects a shift amount between a real position and a reference position of a timer piston provided in a timer mechanism and corrects a fuel injection start timing. A learning value calculating means for calculating the deviation amount as a learning value during the change to the stop state; and comparing the learning value up to the previous time with the current learning value and storing a value which is not large as the latest learning value. A fuel injection device comprising: storage means; and timer control means for controlling the timer mechanism based on the value of the storage means, correcting the position of the timer piston, and determining fuel injection timing. Fuel injection timing adjustment device. 2. A fuel injection timing adjusting device for an electronic fuel injection device, which detects a deviation amount between a real position and a reference position of a timer piston provided in a timer mechanism and corrects a fuel injection start timing. A learning value calculating unit that calculates the deviation amount as a learning value during a change from the state to the stop state; and a physical quantity that increases in association with an increase in the driving time of the engine.
Or, a storage means for storing the measured value of the number of artificial or mechanical operations up to the previous time, and comparing the learned value up to the previous time with the current learned value and storing a value that is not large as the latest learned value, Timer control means for controlling the timer mechanism based on the learned value of the storage means to correct the position of the timer piston to determine the fuel injection timing; and when the measured value has reached a predetermined value or more, And a learning value calculation executing means for executing the learning value calculating means. 3. The engine according to claim 1, wherein the storage means stores the number of engine stoppages which has been changed from the operating state of the engine to the stop state until the last time. 3. The fuel injection timing adjusting device for a fuel injection device according to claim 2, wherein the calculating means is executed. 4. The learning operation means according to claim 1, wherein said learning operation means is executed when the number of times of learning is less than a predetermined value.
And a fuel injection timing adjusting device for the fuel injection device according to claim 2.