Fuel injection amount control system

Abstract

To provide a technique capable of making an air-fuel ratio of exhaust gas discharged from a cylinder close to a target air-fuel ratio.SOLUTION: A control apparatus may execute, with respect to one specific fuel injection device among a plurality of fuel injection devices: temporary change processing of temporarily changing a fuel injection amount of the fuel injection device; first specifying processing of specifying a difference between a predetermined target air-fuel ratio and a detected air-fuel ratio of an air-fuel ratio sensor before temporarily changing a fuel injection amount of the fuel injection device by the temporary change processing; second specifying processing of specifying a difference between the target air-fuel ratio and the detected air-fuel ratio of the air-fuel ratio sensor after temporarily changing a fuel injection amount of the fuel injection device by the temporary change processing; and main change processing of using as a real change amount, an amount calculated by multiplying a temporarily changed amount by the temporary change processing by a predetermined ratio when a difference specified in the second specifying processing is smaller than a difference specified in the first specifying processing, and changing a fuel injection amount only for the real change amount from a fuel injection amount before temporarily changing a fuel injection amount of the fuel injection device by the temporary change processing.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The technology disclosed in this specification relates to a fuel injection amount control system.

Background Art

[0002] Patent Document 1 discloses an exhaust gas purification device. The exhaust gas purification device of Patent Document 1 includes a plurality of cylinders, a plurality of fuel injection devices provided for each of the plurality of cylinders for injecting fuel into each cylinder, and an exhaust passage connected to the plurality of cylinders through which exhaust gas discharged from all of the plurality of cylinders passes.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the exhaust gas purification device of Patent Document 1, due to product variations of the plurality of fuel injection devices, variations may occur in the injection amount of fuel injected from each of the plurality of fuel injection devices. Further, as a result, the air - fuel ratio of the exhaust gas discharged from each of the plurality of cylinders may deviate from the target air - fuel ratio. This specification provides a technology capable of bringing the air - fuel ratio of the exhaust gas discharged from a cylinder closer to the target air - fuel ratio.

Means for Solving the Problems

[0005] In a first aspect of the present technology, a fuel injection amount control system includes a plurality of cylinders, a plurality of fuel injection devices provided for each of the plurality of cylinders and injecting fuel into each of the cylinders, an exhaust passage connected to the plurality of cylinders and through which exhaust gas discharged from all of the plurality of cylinders passes, an air-fuel ratio sensor that detects the air-fuel ratio of the exhaust gas passing through the exhaust passage, and a control device. The control device performs a temporary change process of temporarily changing the fuel injection amount of a specific one of the plurality of fuel injection devices, a first specifying process of specifying a difference between a predetermined target air-fuel ratio and the detected air-fuel ratio of the air-fuel ratio sensor before temporarily changing the fuel injection amount of the fuel injection device by the temporary change process, a second specifying process of specifying a difference between the target air-fuel ratio and the detected air-fuel ratio of the air-fuel ratio sensor after temporarily changing the fuel injection amount of the fuel injection device by the temporary change process, and when the difference specified by the second specifying process is smaller than the difference specified by the first specifying process, a true change amount calculated by multiplying the amount temporarily changed by the temporary change process by a predetermined ratio is set as the true change amount, and a main change process of changing the fuel injection amount by the true change amount from the fuel injection amount before temporarily changing the fuel injection amount of the fuel injection device by the temporary change process may be executed.

[0006] According to this configuration, the change amount of the fuel injection amount is determined using the difference between the target air-fuel ratio and the detected air-fuel ratio after temporarily changing the fuel injection amount as a determination factor. At this time, a more appropriate true change amount can be determined by multiplying the temporarily changed amount of the fuel injection amount by a predetermined ratio. When changing the fuel injection amount, if the temporarily changed amount is applied as it is, the change amount may become excessive. However, by multiplying the temporarily changed amount by a predetermined ratio, a more appropriate true change amount can be determined. As a result, the fuel injection amount can be made more appropriate, and the air-fuel ratio of the exhaust gas discharged from the cylinder can be made closer to the target air-fuel ratio.

[0007] In a second aspect, in the first aspect described above, the predetermined ratio multiplied by the amount temporarily changed by the temporary change process may be determined according to the engine speed and the engine load factor.

[0008] According to this configuration, the fuel injection amount of the fuel injection device can be made more appropriate according to the engine speed and the engine load ratio. As a result, the air-fuel ratio of the exhaust gas discharged from the cylinder can be brought closer to the target air-fuel ratio.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Mode for Carrying Out the Invention

[0010] The fuel injection amount control system 2 of the embodiment will be described with reference to the drawings. As shown in FIG. 1, the fuel injection amount control system 2 of the embodiment includes an engine 4 and a control device 100 that controls the engine 4. The fuel injection amount control system 2 is mounted on, for example, a gasoline vehicle or a hybrid vehicle.

[0011] The engine 4 includes, for example, a plurality of cylinders 20 (first cylinder 20a - fourth cylinder 20d), an intake passage 40 connected to the plurality of cylinders 20a - 20d, and an exhaust passage 50 connected to the plurality of cylinders 20a - 20d. The engine 4 also includes a plurality of fuel injection devices 30 (first fuel injection device 30a - fourth fuel injection device 30d) attached to each of the plurality of cylinders 20a - 20d. The engine 4 operates by burning fuel (for example, gasoline) supplied from the plurality of fuel injection devices 30. The engine 4 may also be called a reciprocating engine.

[0012] Each cylinder 20a - 20d of the engine 4 is provided with, for example, pistons 22a - 22d. In each cylinder 20a - 20d, when fuel (for example, gasoline) burns, each piston 22a - 22d reciprocates. The reciprocation of the pistons 22a - 22d in each of the plurality of cylinders 20a - 20d causes the engine 4 to operate. Since the operating principle of the piston 22 and the engine 4 is already known, a detailed description is omitted. Also, in each cylinder 20a - 20d, exhaust gas is generated when the fuel burns. The exhaust gas generated in each cylinder 20a - 20d is discharged into the exhaust passage 50.

[0013] The intake passage 40 is a passage through which the air inhaled into the plurality of cylinders 20a - 20d passes. The intake passage 40 includes one first intake passage 42 on the upstream side and a plurality of second intake passages 44a - 44d on the downstream side. The first intake passage 42 is provided with, for example, a throttle valve 48 that adjusts the flow rate of the air inhaled into the plurality of cylinders 20. The air volume can be adjusted by the opening degree of the throttle valve 48.

[0014] The plurality of second intake passages 44a - 44d branch off from the first intake passage 42. The downstream ends of the plurality of second intake passages 44a - 44d are respectively connected to the plurality of cylinders 20a - 20d. Each second intake passage 44a - 44d is connected to, for example, an intake valve (not shown) provided in each cylinder 20a - 20d. Air is introduced into each cylinder 20a - 20d through each second intake passage 44a - 44d.

[0015] The exhaust passage 50 is a passage that discharges the exhaust gas discharged from the plurality of cylinders 20a - 20d to the outside. The exhaust gas discharged from the plurality of cylinders 20a - 20d passes through the exhaust passage 50. The exhaust passage 50 includes a plurality of first exhaust passages 52a - 52d on the upstream side and one second exhaust passage 54 on the downstream side.

[0016] The upstream ends of the plurality of first exhaust passages 52a - 52d are respectively connected to the plurality of cylinders 20a - 20d. Each of the first exhaust passages 52a - 52d is connected to, for example, an exhaust valve (not shown) provided in each cylinder 20a - 20d. Each of the first exhaust passages 52a - 52d guides the exhaust gas discharged from each cylinder 20a - 20d to the second exhaust passage 54. The plurality of first exhaust passages 52a - 52d merge at their downstream ends and are connected to the second exhaust passage 54.

[0017] The second exhaust passage 54 discharges the exhaust gas collected by the plurality of first exhaust passages 52a - 52d to the outside. The second exhaust passage 54 is a passage through which the exhaust gas discharged from all of the plurality of cylinders 20a - 20d passes. The second exhaust passage 54 is connected to the plurality of cylinders 20a - 20d via the plurality of first exhaust passages 52a - 52d. For example, an air - fuel ratio sensor 10 and a catalytic device 60 are provided in the second exhaust passage 54.

[0018] The air - fuel ratio sensor 10 detects the air - fuel ratio of the exhaust gas passing through the second exhaust passage 54. The air - fuel ratio sensor 10 is disposed on the downstream side of the plurality of first exhaust passages 52a - 52d. Therefore, the air - fuel ratio sensor 10 detects the air - fuel ratio of the exhaust gas discharged from all of the plurality of first exhaust passages 52. That is, the air - fuel ratio sensor 10 detects the air - fuel ratio of the exhaust gas discharged from all of the plurality of cylinders 20a - 20d. The air - fuel ratio sensor 10 detects the air - fuel ratio of the exhaust gas upstream of the catalytic device 60. As the air - fuel ratio sensor 10, for example, a wide - range air - fuel ratio sensor in which the sensor current changes linearly according to the oxygen concentration of the exhaust gas can be used. The information on the air - fuel ratio detected by the air - fuel ratio sensor 10 is transmitted to the control device 100.

[0019] The catalytic device 60 is disposed on the downstream side of the air - fuel ratio sensor 10. The catalytic device 60 purifies the exhaust gas passing through the second exhaust passage 54. The catalytic device 60 includes, for example, a three - way catalyst that removes hydrocarbons, carbon monoxide, and nitrogen oxides contained in the exhaust gas by oxidation or reduction.

[0020] Next, the fuel injection device 30 will be described. The fuel injection device 30 is attached to the cylinder 20 and injects fuel (for example, gasoline) into the cylinder 20. Fuel injection devices 30a - 30d are provided for each of the plurality of cylinders 20a - 20d. Each fuel injection device 30a - 30d injects fuel into each cylinder 20a - 20d. Each fuel injection device 30a - 30d injects fuel in a predetermined fuel injection amount based on a predetermined control signal transmitted from the control device 100. The fuel injection amount of each fuel injection device 30a - 30d is changeable. Each fuel injection device 30a - 30d adjusts the fuel injection amount based on the control signal transmitted from the control device 100. The fuel injection device 30 is, for example, an injector capable of adjusting the fuel injection amount by electronic control.

[0021] In a modified example, the fuel injection device 30 may be attached to the second intake passage 44 instead of the cylinder 20. The fuel injection device 30 may be configured to supply fuel into the cylinder 20 through the second intake passage 44. The plurality of fuel injection devices 30a - 30d may be provided directly or indirectly for the plurality of cylinders 20a - 20d respectively.

[0022] The control device 100 will be described. The control device 100 includes, for example, a CPU, a ROM, a RAM, etc., and executes predetermined control and processing related to the fuel injection amount control system 2 according to a predetermined program. The control device 100 may be called, for example, an ECU (Engine Control Unit).

[0023] The storage unit 102 (e.g., ROM or RAM) of the control device 100 stores predetermined ratio information. As shown in FIG. 2, the ratio information stored in the storage unit 102 indicates the ratios corresponding to a plurality of fuel injection devices (the first fuel injection device 30a - the fourth fuel injection device 30d). Further, the ratio information indicates the ratios corresponding to a plurality of engine speeds of the engine 4. Further, the ratio information indicates the ratios corresponding to a plurality of engine load ratios of the engine 4. The ratio information indicates a predetermined ratio corresponding to the combination of the engine speed, the engine load ratio, and the fuel injection device 30. The ratio information indicates the ratio for determining the true change amount, which will be described later, regarding the fuel injection amount of the fuel injection device 30. This ratio information indicates the values obtained by determining, for each engine speed and each engine load ratio, the ratio of the exhaust gas discharged from each cylinder 20a - 20d for the exhaust gas hitting the air-fuel ratio sensor 10. The ratio information is obtained, for example, in advance by experiments and / or analysis.

[0024] The ratio indicated in the ratio information is obtained, for example, by analyzing the ratio of the flow rate of the exhaust gas passing through each of the plurality of first exhaust passages 52a - 52d to the flow rate of the exhaust gas passing through the second exhaust passage 54. That is, the ratio indicated in the ratio information is obtained, for example, by analyzing the ratio of the flow rate of the exhaust gas discharged from each of the plurality of cylinders 20a - 20d to the flow rate of the exhaust gas discharged from all of the plurality of cylinders 20a - 20d. The greater the flow rate of the exhaust gas passing through an arbitrary first exhaust passage 52 (i.e., the exhaust gas discharged from an arbitrary cylinder 20), the greater the influence of that exhaust gas on the air-fuel ratio detected by the air-fuel ratio sensor 10. The ratio indicated in the ratio information indicates the ratio of the influence on the air-fuel ratio detected by the air-fuel ratio sensor 10.

[0025] In the above fuel injection amount control system 2, the control device 100 transmits a control signal to each of the plurality of fuel injection devices 30a - 30d so that each of the plurality of fuel injection devices 30a - 30d injects fuel with a predetermined fuel injection amount. Each of the fuel injection devices 30a - 30d injects fuel with a predetermined fuel injection amount into each of the cylinders 20a - 20d based on the control signal transmitted from the control device 100.

[0026] Further, in the above fuel injection amount control system 2, air is supplied into a plurality of cylinders 20a - 20d through a plurality of second intake passages 44a - 44d of the intake passage 40. Thereby, air and fuel are mixed in each of the cylinders 20a - 20d. In each of the cylinders 20a - 20d, the fuel supplied from the fuel injection device 30 is mixed with air and burned, causing the piston 22 to reciprocate. Thereby, the engine 4 operates. When the engine 4 operates, exhaust gas is discharged from each of the plurality of cylinders 20a - 20d.

[0027] The exhaust gas discharged from the plurality of cylinders 20a - 20d is discharged into one second exhaust passage 54 through a plurality of first exhaust passages 52a - 52d of the exhaust passage 50, and is discharged to the outside through the one second exhaust passage 54. Therefore, the exhaust gas discharged from all of the plurality of cylinders 20a - 20d passes through the second exhaust passage 54. The air - fuel ratio sensor 10 provided in the second exhaust passage 54 detects the air - fuel ratio of the exhaust gas passing through the second exhaust passage 54.

[0028] (Fuel injection amount control process; FIG. 3) Next, the fuel injection amount control process of the embodiment will be described. The fuel injection amount control process is started, for example, when a predetermined start time arrives. Alternatively, the fuel injection amount control process is started, for example, when the control device 100 receives a predetermined start instruction signal.

[0029] The control device 100 may execute fuel injection amount control processing for each of the plurality of fuel injection devices 30a - 30d. In that case, the control device 100 may execute the fuel injection amount control processing in order from the fuel injection device 30 with a larger ratio shown in the ratio information (see FIG. 2) stored in the storage unit 102. For example, when the engine speed of engine 4 is 500 rpm and the engine load ratio is 50%, the control device 100 may execute the fuel injection amount control processing in the order of the first fuel injection device 30a, the fourth fuel injection device 30d, the second fuel injection device 30b, and the third fuel injection device 30c among the plurality of fuel injection devices 30a - 30d. In a modified example, the control device 100 may execute the fuel injection amount control processing in an arbitrary order.

[0030] As shown in FIG. 3, in S10 of the fuel injection amount control processing, the control device 100 identifies the engine speed and the engine load ratio of engine 4. The engine speed is detected, for example, by a rotational speed sensor (not shown) attached to engine 4. The engine load ratio is calculated based on, for example, the engine speed and the accelerator opening degree, etc. The method of obtaining the engine load ratio is not particularly limited.

[0031] In the subsequent S12, the control device 100 identifies the difference (first difference D1) between a predetermined target air-fuel ratio and the air-fuel ratio detected by the air-fuel ratio sensor 10 in a state where engine 4 is operating (first identification processing). The predetermined target air-fuel ratio is, for example, the stoichiometric air-fuel ratio (14.7). Information on the target air-fuel ratio is stored in the storage unit 102. In S12, in the state before temporarily changing the fuel injection amount of the fuel injection device 30 in later S14, the difference (first difference D1) between the target air-fuel ratio and the detected air-fuel ratio of the air-fuel ratio sensor 10 is identified. The first difference D1 identified in S12 is, for example, the maximum value of the difference between the target air-fuel ratio and the detected air-fuel ratio of the air-fuel ratio sensor 10 during one cycle from intake to exhaust in the operation of engine 4. In a modified example, it may be an average value instead of the maximum value.

[0032] In subsequent S14, for a fuel injection device 30 (for example, the first fuel injection device 30a) provided in a specific one of the plurality of cylinders 20a - 20d (for example, the first cylinder 20a) of the control device 100, the control device 100 temporarily changes (increases or decreases) the fuel injection amount of the fuel injection device 30 (temporary change process). For example, the control device 100 temporarily changes the fuel injection amount of the fuel injection device 30 that shows the largest value in the ratio information shown in FIG. 2 at the current engine speed and engine load factor. The control device 100 transmits a control signal for temporarily changing the fuel injection amount to the fuel injection device 30. Note that the amount of the temporary change in S14 is arbitrary. For example, the control device 100 increases the fuel injection amount by 5% with respect to the current fuel injection amount (the fuel injection amount before the temporary change). The amount of the temporary change in S14 may have an upper limit value (the maximum value of the increase) and a lower limit value (the maximum value of the decrease) set.

[0033] In subsequent S16, with the engine 4 operating, the control device 100 specifies the difference (second difference D2) between the target air-fuel ratio (for example, the stoichiometric air-fuel ratio (14.7)) and the air-fuel ratio detected by the air-fuel ratio sensor 10 (second specifying process). In S16, in the state after the fuel injection amount of the fuel injection device 30 is temporarily changed in S14 above, the control device 100 specifies the difference (second difference D2) between the target air-fuel ratio and the detected air-fuel ratio of the air-fuel ratio sensor 10. The second difference D2 specified in S16 is, for example, the maximum value of the difference between the target air-fuel ratio and the detected air-fuel ratio of the air-fuel ratio sensor 10 during one cycle from intake to exhaust in the operation of the engine 4. Note that in a modification example, it may be an average value instead of the maximum value.

[0034] In subsequent S18, the control device 100 determines whether the difference (second difference D2) between the target air-fuel ratio specified in S16 above and the detected air-fuel ratio is smaller than the difference (first difference D1) between the target air-fuel ratio and the detected air-fuel ratio specified in S12 above. That is, the control device 100 determines whether the difference (second difference D2) between the target air-fuel ratio and the detected air-fuel ratio after temporarily changing the fuel injection amount of the fuel injection device 30 in S14 above is smaller than the difference (first difference D1) between the target air-fuel ratio and the detected air-fuel ratio before temporarily changing the fuel injection amount of the fuel injection device 30 in S14 above. When the second difference D2 is smaller than the first difference D1 (YES in S18), the process proceeds to S20. When YES in S18, it means that the detected air-fuel ratio after temporarily changing the fuel injection amount of the fuel injection device 30 in S14 above has approached the target air-fuel ratio more than the detected air-fuel ratio before temporarily changing the fuel injection amount. On the other hand, when the second difference D2 is greater than or equal to the first difference D1 (NO in S18), the process returns to S14.

[0035] In S14 after NO in S18, the control device 100 changes the amount of the temporary change and temporarily changes the fuel injection amount of the fuel injection device 30 again. The control device 100 temporarily changes the fuel injection amount of the fuel injection device 30 (for example, the first fuel injection device 30a) that is the target of the temporary change in S14 above again.

[0036] On the other hand, in S20 after YES in S18, the control device 100 determines the true change amount for the fuel injection amount of the fuel injection device 30 (for example, the first fuel injection device 30a) that is the target of the temporary change in S14 above. The control device 100 determines the amount calculated by multiplying the amount of the temporary change in S14 above by a predetermined ratio as the true change amount. The predetermined ratio is determined based on the ratio information stored in the storage unit 102. The predetermined ratio is the ratio corresponding to the fuel injection device 30 (for example, the first fuel injection device 30a) that is the target of the temporary change in S14 above. Also, the predetermined ratio is the ratio corresponding to the engine speed and the engine load factor specified in S10 above. The control device 100 determines the true change amount based on the amount of the temporary change in S14 and the ratio shown in the ratio information. For example, the amount of the temporary change (5% of the fuel injection amount) × the predetermined ratio (0.4) = the true change amount (2% of the fuel injection amount).

[0037] In the subsequent S22, the control device 100 changes (increases or decreases) the fuel injection amount of the fuel injection device 30 (for example, the first fuel injection device 30a) that is the target of the temporary change in S14 above (this actual change process). For the fuel injection device 30 (for example, the first fuel injection device 30a) that is the target of the temporary change in S14 above, the control device 100 changes (for example, increases) the fuel injection amount by the true change amount (for example, 2% of the fuel injection amount) determined in S20 above from the fuel injection amount before the temporary change in S14 above.

[0038] (Effect) As described above, the fuel injection amount control system 2 of the embodiment has been described. As is clear from the above description, the control device 100 executes the temporary change process (S14), the first specifying process (S12), and the second specifying process (S16). When the difference (second difference D2) specified by the second specifying process is smaller than the difference (first difference D1) specified by the first specifying process, the amount calculated by multiplying the amount temporarily changed by the temporary change process by a predetermined ratio is set as the true change amount, and the control device 100 executes this actual change process of changing the fuel injection amount by the true change amount from the fuel injection amount before temporarily changing the fuel injection amount of the fuel injection device 30 (for example, the first fuel injection device 30a) by the temporary change process.

[0039] According to this configuration, the change amount of the fuel injection amount is determined using the difference between the target air-fuel ratio and the detected air-fuel ratio after temporarily changing the fuel injection amount as a determination factor. At this time, a more appropriate true change amount can be determined by multiplying the temporarily changed amount of the fuel injection amount by a predetermined ratio. When changing the fuel injection amount, if the temporarily changed amount is applied as it is, the change amount may be excessive. However, by multiplying the temporarily changed amount by a predetermined ratio, a more appropriate true change amount can be determined. As a result, the fuel injection amount can be made more appropriate, and the air-fuel ratio of the exhaust gas discharged from the cylinder 20 can be made closer to the target air-fuel ratio.

[0040] The predetermined ratio multiplied by the amount temporarily changed by the temporary change process is determined according to the engine speed and the engine load factor. According to this configuration, the fuel injection amount of the fuel injection device 30 can be made more appropriate according to the engine speed and the engine load factor. Thereby, the air-fuel ratio of the exhaust gas discharged from the cylinder 20 can be made closer to the target air-fuel ratio.

[0041] As described above, specific examples of the present invention have been described in detail, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or the drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in this specification or the drawings can achieve a plurality of objectives simultaneously, and has technical utility by achieving one of the objectives itself.

Explanation of Reference Numerals

[0042] 2: Fuel injection amount control system, 4: Engine, 10: Air-fuel ratio sensor, 20: Cylinder, 22: Piston, 30: Fuel injection device, 40: Intake passage, 42: First intake passage, 44: Second intake passage, 48: Throttle valve, 50: Exhaust passage, 52: First exhaust passage, 54: Second exhaust passage, 60: Catalyst device, 100: Control device, 102: Storage unit

Claims

1. A plurality of cylinders, A plurality of fuel injection devices provided for each of the plurality of cylinders and injecting fuel into each of the cylinders, An exhaust passage connected to the plurality of cylinders and through which exhaust gas discharged from all of the plurality of cylinders passes, An air-fuel ratio sensor that detects the air-fuel ratio of the exhaust gas passing through the exhaust passage, A control device, and comprising: The control device is configured to: For a specific one of the plurality of fuel injection devices, A temporary change process for temporarily changing the fuel injection amount of the fuel injection device, A first specifying process for specifying a difference between a predetermined target air-fuel ratio and the detected air-fuel ratio of the air-fuel ratio sensor before temporarily changing the fuel injection amount of the fuel injection device by the temporary change process, A second specifying process for specifying a difference between the target air-fuel ratio and the detected air-fuel ratio of the air-fuel ratio sensor after temporarily changing the fuel injection amount of the fuel injection device by the temporary change process, When the difference specified by the second specifying process is smaller than the difference specified by the first specifying process, an amount calculated by multiplying the amount temporarily changed by the temporary change process by a predetermined ratio is set as the true change amount, and a main change process for changing the fuel injection amount by the true change amount from the fuel injection amount before temporarily changing the fuel injection amount of the fuel injection device by the temporary change process is executed. A fuel injection amount control system.

2. The fuel injection amount control system according to claim 1, wherein The predetermined ratio multiplied by the amount temporarily changed by the temporary change process is determined according to the engine speed and the engine load factor. A fuel injection amount control system.

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