JPH10159622A - Engine output automatic adjusting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic adjuster for engine output, in which dispersion of engine output is reduced without requiring lapping at the time of shipping and adjustment of output accompanied by this lapping. SOLUTION: A torque sensor 25 is added to an electronic controller comprising the electronic governor 13 of a fuel injection pump 11 and a controller 14, and an actual engine output torque is measured by this torque sensor 25, and also this output torque is compared with a target value previously memorized in the memory of the controller 14. Then, an engine injection quantity is adjusted on the basis of a deviation calculated under on such comparison.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically adjusting the output of an engine, and more particularly, to an automatic device for adjusting the output of an engine having an electronic control device for controlling the amount of fuel supplied by the electronic control device. .

[0002]

2. Description of the Related Art In the case of manufacturing a vehicle-mounted engine, for example, after assembling of the engine is completed, the engine is mounted on a lapping table and connected to a predetermined load to perform a running-in operation. I have. At this time, the output of the engine is measured, and it is determined whether the output is a correct value. When the output of the engine is lower than the set output, adjustment is made so as to increase the fuel supply amount. When the output of the engine is larger than the set value, the adjustment is made so as to reduce the supply amount of the engine.

For example, in the case of a diesel engine, a fuel injection pump is adjusted to increase or decrease the fuel injection amount by changing a lever ratio of a mechanical governor provided in the fuel injection pump. A constant output is produced.

[0004]

As described above, conventionally, at the time of shipment of an engine, the lapping operation is performed for each engine, the output is measured, and the fuel supply amount or the injection amount is adjusted. I try to eliminate variations. Such work is performed by skilled workers, but the variation cannot be completely suppressed. Further, such adjustment of the output of the fuel at the time of shipping increases the number of steps and disadvantageously increases the time until shipping. Even if such an adjustment is made, the output may change over time while the engine is being used, but such a change can be dealt with by the adjustment in the lapping operation described above. Can not do.

The present invention has been made in view of such problems, and it is possible to omit the above-described lapping operation at the time of shipment of an engine and the accompanying steps of adjusting the fuel supply amount or injection amount. It is an object of the present invention to provide an automatic engine output adjusting device capable of automatically adjusting the engine output and absorbing the variation in the output.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided a torque sensor for measuring an output torque under a predetermined condition in an engine having an electronic control unit for controlling a fuel supply amount by the electronic control unit. Correction means for correcting the fuel supply amount according to the detection output of the torque sensor,
The present invention relates to a device for automatically adjusting an engine output, each device comprising:

[0007] Still another invention comprises an electronic control unit,
In an engine in which the amount of fuel supplied is controlled by the electronic control unit, a storage means for storing a signal corresponding to an output torque of the engine measured by a dynamometer, and a value stored by the storage means And a correction means for correcting the supply amount of fuel in response thereto.

[0008]

FIG. 1 shows an engine 10 provided with an automatic output adjusting device according to an embodiment of the present invention. The engine 10 is, for example, a diesel engine for a vehicle, and has a fuel injection pump 11 attached to a side surface of a cylinder block. Fuel injection pump 1
1 is driven by a part of the output of the engine via the camshaft 12. Also, the fuel injection pump 11 controls the supply amount of fuel injected at one time,
An electronic governor 13 is attached to the fuel injection pump 11. The electronic governor 13 is controlled by a controller 14 having a computer. The controller 14 and the electronic governor 13 move the control rack of the fuel injection pump 11 to adjust the amount of supplied fuel, thereby controlling the engine. Output is adjusted.

The controller 14 includes a rotation speed detection sensor 18 for detecting the rotation speed of the engine 10, a water temperature sensor 19 for detecting the temperature of cooling water circulating in the engine 10, and a temperature of intake air taken into the engine. An intake air temperature sensor 20, a fuel temperature sensor 21 for detecting the temperature of the fuel injected by the fuel injection pump 11, and an accelerator opening sensor 22 for detecting the opening of an accelerator pedal are respectively connected. Further, a torque sensor 25 is connected to the controller 14, and the output of the engine is fed back to the controller 14 by the torque sensor 25. Here, a non-contact photoelectric torque sensor 25 is used.

In such an engine 10, the fuel pressurized by the fuel injection pump 11 is injected into each cylinder at a predetermined timing through a fuel injection nozzle, and the injected fuel is sprayed by a piston. Is naturally ignited by the heat of the intake air compressed by moving to the top dead center, combustion is performed, and an output is taken out.

Next, an automatic adjusting device for the output of the engine 10 will be described. In the nonvolatile memory of the computer in the controller 14, a map corresponding to the graph shown in FIG. 2 regarding the engine speed and the output torque is stored in advance.

Then, the engine 10 is operated under predetermined conditions. That is, the accelerator opening is set as shown in FIG. 3, and the rotation speed of the engine 10 is set to a predetermined value. Then, the output of the engine 10 at this time is detected by the torque sensor 25, and the detected output of the torque sensor 25 is processed by a computer in the controller 14, and the deviation between the output torque of the engine and the target value is calculated. The target value is, for example, a value set by a graph as shown in FIG. Then, the deviation value obtained based on the calculation of the deviation is stored in the memory of the computer of the controller 14.

Based on such a deviation value, the fuel injection amount is corrected as shown in FIG. That is, during operation of the engine, the engine 1
In addition to the rotation speed of 0, the accelerator opening sensor 22
To read the accelerator opening. Then, the fuel injection amount is calculated based on these values. Further, the fuel injection amount is corrected based on the deviation value. After such correction, fuel injection is performed by the fuel injection pump 11. That is, the injection amount is corrected according to the characteristics of each engine 10.

As described above, the automatic engine output adjusting device according to the present embodiment includes the electronic governor 13 and the controller 1.
4 and a torque sensor 25 in combination with the engine 10 having an electronic control unit for the fuel supply amount. A relationship between the target engine speed and torque, for example, a map corresponding to the characteristic shown in FIG. 2 is stored in the computer of the controller 14, and the fuel is adjusted to the target torque in accordance with the accelerator opening information. This is to control the injection amount.

As described above, the information on the output of the engine 10 is fed back to the controller 14 by the torque sensor 25, and the deviation between the actual output torque and the target value is obtained by calculation, and the fuel injection amount is calculated according to the deviation. Therefore, it is not necessary to adjust the fuel injection amount for each engine. Therefore, after assembling the engine 10, it is mounted on the lapping table,
It is no longer necessary to perform a lapping operation.

Further, such a system not only allows the intended injection amount to be set correctly, but also ensures that the engine 10 always exhibits the characteristics shown in FIG.
By repeating the control of the flowchart shown in (1), the output of the engine can be constantly monitored. The deviation value is refreshed based on such monitoring, and the injection amount is corrected based on the refreshed deviation value, so that not only the deterioration of the output over time can be determined, It is possible to correct the deterioration of the output and eliminate the fluctuation of the output over time.

Next, another embodiment will be described with reference to FIG. In this embodiment, the fuel injection amount at the time of shipment is adjusted using the torque sensor 31 of the dynamometer 30 at the time of the test of the engine 10 without providing the torque sensor in the engine 10 itself. Things.

When performing this operation, the engine 10
Is connected to the dynamometer 30 via the coupling 32, and a shipping test of the engine 10 is performed. At this time, the torque sensor 31 of the dynamometer 30 is connected to the controller 14. Then, the torque sensor 31 is provided to the controller 14.
Is read, and based on such an output, it is possible to calculate the deviation between the engine output torque and the target value based on the flowchart shown in FIG. By correcting the supply amount of the fuel injected by the fuel injection pump 11 based on the deviation value based on the flowchart shown in FIG. 4, it is not necessary to adjust the fuel injection amount at the time of shipment.

According to such a system, although it is impossible to detect deterioration of the output of the engine over time, it is not necessary to adjust the injection amount based on the measurement of the engine output. Further, since there is no need for a worker to adjust the injection amount separately, it is possible to reduce variations in engine output. In addition, since it is not necessary to provide the torque sensors 25 in all the engines 10, it is possible to reduce costs.

[0020]

As described above, according to the present invention, the output torque of the engine under predetermined conditions is measured by the torque sensor, and the fuel supply amount is corrected by the correction means in accordance with the detected output of the torque sensor. It was done.

Therefore, according to the present invention, by providing a torque sensor in the engine, a deviation between a target torque and an output torque under predetermined conditions is obtained, and the amount of supplied fuel is automatically adjusted in accordance with the deviation. The lapping operation at the time of shipment and the output adjustment at the time of the lapping operation can be omitted. In addition, it is possible to reduce engine output variation. In addition, by checking the output from the torque sensor from time to time, it is possible to detect deterioration of the engine output over time and make corrections in response to this deterioration, thereby reducing variations in the engine output over time. Become.

According to another aspect of the invention, a signal corresponding to the output torque of the engine measured by the dynamometer is stored in the storage means, and the fuel supply amount is adjusted by the correction means in accordance with the value stored by the storage means. It is intended to be modified.

Therefore, according to such a configuration, it becomes possible to correct the fuel supply amount according to the value stored by the storage means, and it becomes unnecessary to adjust the output at the time of shipment, and to reduce the variation in the engine output. It can be eliminated.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an automatic engine output adjustment device.

FIG. 2 is a graph showing a change in torque with respect to an engine speed.

FIG. 3 is a flowchart showing an operation for obtaining a deviation between an actual output torque and a target value.

FIG. 4 is a flowchart showing an operation of correcting an injection amount according to a deviation value.

FIG. 5 is a block diagram illustrating an automatic engine output adjustment device according to another embodiment.

[Explanation of symbols]

 Reference Signs List 10 engine 11 fuel injection pump 12 camshaft 13 electronic governor 14 controller 18 rotation speed detection sensor 19 water temperature sensor 20 intake temperature sensor 21 fuel temperature sensor 22 accelerator opening sensor 25 torque sensor 30 dynamometer 31 torque sensor 32 coupling

Claims (2)

[Claims] An engine provided with an electronic control unit, wherein the electronic control unit controls a fuel supply amount. A torque sensor for measuring an output torque under predetermined conditions, and a detection output of the torque sensor. Correction means for correcting the fuel supply amount according to the following. 2. An engine provided with an electronic control unit, wherein a signal corresponding to an output torque of the engine measured by a dynamometer is stored in an engine in which the supply amount of fuel is controlled by the electronic control unit. Means for adjusting the fuel supply amount according to the value stored by the storage means.