JP2008274789A - Control system for direct injection engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control system for a direct injection engine, controlling injection from an injector for cylinder injection in catalyst warm-up promotion processing, in view of prevention of delay of the catalyst warm-up promotion processing caused by increase of unvaporized fuel, and combustion stability. <P>SOLUTION: The control system for a direct injection engine has the injector for cylinder injection injecting fuel in an intake stroke and a compression stroke, in the catalyst warm-up promotion processing for activating a catalytic converter. The control system further has a sensor detecting concentration of alcohol in the fuel, and a control part controlling a fuel injection amount in the compression stroke, based on information on the alcohol concentration from the sensor. The alcohol concentration and the injection amount have a first relation in which the injection amount is increased according to the alcohol concentration until the alcohol concentration exceeds a default, and the injection amount is fixed regardless of the alcohol concentration when the alcohol concentration exceeds the default. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a control system for a direct injection engine, and more particularly to a control system for controlling injection from an in-cylinder injector during catalyst warm-up promotion processing for activating a catalytic converter.

  There has been proposed a control system that controls the injection performed in the intake stroke and the compression stroke in accordance with the alcohol concentration of the fuel during the catalyst warm-up acceleration processing.

Patent Document 1 discloses a control system that increases the fuel injection amount in the intake stroke compared to the fuel injection amount in the compression stroke in order to promote fuel vaporization when the alcohol concentration is high.
JP 2006-291971 A

  However, since the fuel injection amount in the compression stroke is not increased, the air-fuel ratio around the spark plug becomes leaner than the target air-fuel ratio, which may impair combustion stability. However, if the fuel injection amount in the compression stroke is too large, the fuel that is not vaporized increases, and the catalyst warm-up promotion processing may be delayed due to ignition failure or the like.

  Accordingly, an object of the present invention is to control the injection from the in-cylinder injector during the catalyst warm-up promotion process in consideration of prevention of delay of the catalyst warm-up promotion process due to an increase in fuel that does not vaporize and combustion stability. It is to provide a control system for a direct injection engine.

  The control system for a direct injection engine according to the present invention detects an in-cylinder injector that injects fuel in an intake stroke and a compression stroke, and an alcohol concentration in the fuel during a catalyst warm-up promotion process for activating the catalytic converter. And a control unit that controls the fuel injection amount in the compression stroke based on the information on the alcohol concentration from the sensor. The alcohol concentration and the injection amount are alcohol until the alcohol concentration exceeds a predetermined value. When the injection amount increases according to the concentration and exceeds a predetermined value, the injection amount is constant regardless of the alcohol concentration. As a result, since the injection amount in the compression stroke increases as the alcohol concentration increases, fuel with good evaporation characteristics (for example, gasoline) is sufficiently supplied into the cylinder, stratified combustion is established, and vaporization deterioration (fuel that does not vaporize) It is possible to suppress the dilution of the air-fuel mixture accompanying the increase in Further, when the alcohol concentration is equal to or higher than a predetermined value (alcohol concentration predetermined value), it is possible to suppress an increase in fuel that is not vaporized by making the fuel injection amount constant in the compression stroke.

  Preferably, a temperature sensor for detecting the temperature of the direct injection engine is further provided, and when the temperature is equal to or higher than the threshold value, the control unit sets the injection amount in the compression stroke during the catalyst warm-up acceleration process regardless of the alcohol concentration. The injection amount when the alcohol concentration in the first relationship is low is used. Thus, when the cooling water temperature of the engine body is equal to or higher than a predetermined temperature, the alcohol concentration is low in consideration of the rapid increase in the amount of alcohol fuel vaporized (for example, the lowest alcohol concentration is 0%). By using the compression stroke injection amount, it is possible to reduce the injection amount and avoid an over-rich state due to a rapid increase in the amount of vaporization.

  Preferably, the control unit controls the fuel injection ratio to the compression stroke in the intake stroke and the compression stroke during the catalyst warm-up acceleration processing based on the information on the alcohol concentration from the sensor, and the alcohol concentration and The spray ratio has a second relationship in which the spray ratio increases according to the alcohol concentration until the alcohol concentration exceeds a predetermined value, and when the alcohol concentration exceeds the predetermined value, the spray ratio decreases according to the alcohol concentration. .

  Preferably, a temperature sensor for detecting the temperature of the direct injection engine is further provided, and when the temperature is equal to or higher than the threshold value, the control unit performs the intake stroke and compression during the catalyst warm-up acceleration process regardless of the alcohol concentration. The ratio of fuel injection to the compression stroke in the stroke is set low.

  Preferably, the catalyst warm-up promoting process further includes an ignition plug that ignites in a state in which the ignition timing is retarded, and the control unit determines the ignition timing retard amount based on information on the alcohol concentration from the sensor. Control the alcohol concentration and retard amount until the alcohol concentration exceeds the preset value, the retard amount increases according to the alcohol concentration, and when it exceeds the preset value, the retard amount decreases according to the alcohol concentration. Has a third relationship. Accordingly, it is possible to improve the warm-up performance (complete the catalyst warm-up promotion process quickly) by increasing the retard amount of the ignition timing of the spark plug. Further, when the alcohol concentration is equal to or higher than a predetermined value (alcohol concentration predetermined value), it is possible to suppress deterioration in combustion stability by reducing the retard amount.

  Preferably, the catalyst further includes an intake valve that closes in an advanced state during the catalyst warm-up promotion process, and the control unit controls the advance amount of the timing to close the intake valve based on information on the alcohol concentration from the sensor. The alcohol concentration and the advance amount have a fourth relationship in which the advance amount increases according to the alcohol concentration. Accordingly, by advancing the timing for closing the intake valve, it is possible to increase the in-cylinder temperature and suppress the deterioration of vaporization due to the increase in the alcohol concentration.

  As described above, according to the present invention, the injection from the in-cylinder injector at the time of the catalyst warm-up acceleration processing is considered in consideration of the delay prevention of the catalyst warm-up acceleration processing due to the increase in the fuel that is not vaporized and the combustion stability. It is possible to provide a control system for a direct injection engine that controls the engine.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. The control system for the direct injection engine in the first embodiment includes an engine body 1, an air cleaner 2, an intake passage 3, an electrically controlled throttle valve 4, an in-cylinder injector 6, a spark plug 7, an exhaust passage 8, a catalytic converter 9, Variable intake valve timing control mechanism such as electric control EGR valve 10, EGR passage 11, fuel tank 12, low pressure pump 13, high pressure pump 15, fuel distribution pipe 16, return passage 17, ECU 20, intake valve 21, exhaust valve 22, VVT 23, a water temperature sensor 26 that detects the cooling water temperature of the engine body 1, an air-fuel ratio sensor 27 that outputs a signal corresponding to the rich / lean exhaust air-fuel ratio in the exhaust passage 8, and an alcohol concentration of the fuel mf in the fuel distribution pipe 16. An alcohol concentration sensor 30 is provided.

  In the first embodiment, a mode in which a mixed fuel of gasoline and alcohol is used as the fuel mf of the engine body 1 will be described. However, other modes using a fuel containing alcohol may be used.

  First, the operation of the engine body 1 will be described. When the intake valve 21 is opened, air is sucked into the combustion chamber of each cylinder of the engine body 1 through the air cleaner 2 and the intake passage 3 under the control of the electrically controlled throttle valve 4. The intake valve 21 is opened and closed by a variable intake valve timing control mechanism 23 controlled by the ECU 20.

  The fuel mf injected from the injector 6 mixes with the sucked air to form an air-fuel mixture. The air-fuel mixture burns by ignition of the spark plug 7 based on the ignition signal from the ECU 20.

  Exhaust gas from the engine body 1 is discharged from the exhaust passage 8 when the exhaust valve 22 is opened, and is purified by the catalytic converter 9 provided in the exhaust passage 8. Further, a part of the exhaust is recirculated to the intake passage 3 downstream of the throttle valve 4 in the intake passage 3 by the EGR passage 11 via the electric control EGR valve 10.

  Next, the operation for supplying the fuel mf to the engine body 1 will be described. Fuel is sucked up from the fuel tank 12 by a low pressure pump 13, pressurized to a target injection pressure by a high pressure pump 15 connected via a low pressure supply passage, and supplied to a fuel distribution pipe 16 connected to the injector 6. The The return passage 17 is a passage for returning surplus fuel from the fuel distribution pipe 16 to the fuel tank 12.

  Next, the operation of the ECU 20 will be described. The ECU 20 includes a microcomputer including a CPU, a ROM, a RAM, an A / D converter, an input / output interface, and the like, receives input signals from various sensors, performs arithmetic processing based on the signals, Control the operation.

  In particular, in the present embodiment, during the first idle after the cold start, the fuel mf is injected during the intake stroke and the compression stroke, and the spark plug 7 is ignited with the ignition timing retarded, so that the catalytic converter 9 A catalyst warm-up promotion process for promoting warm-up is performed. In this catalyst warm-up promotion process, the ECU 20 performs the compression stroke of the fuel mf injected from the injector 6 based on the information on the coolant temperature from the water temperature sensor 26 and the information on the alcohol concentration of the fuel mf from the alcohol concentration sensor 30. And the injection ratio of the intake stroke and the compression stroke to the compression stroke are controlled. Further, in the catalyst warm-up promotion processing, the ECU 20 controls the ignition timing of the spark plug 7 based on the information on the cooling water temperature from the water temperature sensor 26 and the information on the alcohol concentration of the fuel mf from the alcohol concentration sensor 30. Then, the timing for closing the intake valve 21 is advanced.

  In the ROM of the ECU 20, relational expressions (first to first) for injection amount control, injection ratio control, ignition timing retardation control, and intake valve closing timing advance control in the compression stroke at the time of catalyst warm-up promotion processing. Map data corresponding to the four relational expressions f1 to f4) is recorded.

  Specifically, map data corresponding to the first relational expression f1 indicating the relationship between the alcohol concentration in the fuel mf and the injection amount of the fuel mf in the compression stroke is recorded for injection amount control. In the first relational expression f1, the alcohol concentration increases until the alcohol concentration reaches the alcohol concentration predetermined value Fr, and the injection amount of the fuel mf in the compression stroke increases. When the alcohol concentration exceeds the alcohol concentration predetermined value Fr, the fuel mf The injection amount has a first relationship indicating a constant value (an injection amount when the alcohol concentration is a predetermined value Fr) (see FIG. 3).

  Further, for the injection ratio control, map data corresponding to the second relational expression f2 indicating the relationship between the alcohol concentration in the fuel mf and the injection ratio of the fuel mf to the compression stroke in the intake stroke and the compression stroke is recorded. Is done. In the second relational expression f2, the alcohol concentration increases and the ratio of spraying to the compression stroke increases until the alcohol concentration reaches the alcohol concentration predetermined value Fr. When the alcohol concentration exceeds the alcohol concentration predetermined value Fr, the alcohol concentration increases. And has a second relationship that decreases from the spraying ratio (maximum spraying ratio) in the case of the alcohol concentration predetermined value Fr (see FIG. 4).

  The total injection amount (injection amount in the intake stroke + injection amount in the compression stroke) is set in a relationship that increases according to the alcohol concentration so as to exceed the injection amount that can be operated with the same excess air ratio. Based on the injection amount and the first and second relational expressions f1 and f2, the injection amount in the intake stroke and the compression stroke is set.

  However, when the cooling water temperature of the engine body 1 is equal to or higher than the threshold value, the injection amount in the compression stroke and the ratio of injection into the compression stroke are the lowest (0%) regardless of the alcohol concentration value. Is set to the value of The reason why both the injection amount and the injection ratio are set to a small value when the alcohol concentration is low is that if only the injection amount is set to a small value when the alcohol concentration is low, there is a possibility that the entire injection amount decreases and a lean state is caused. Therefore, the intention is to avoid such a lean state.

  Further, for ignition timing retard control, a third relational expression showing the relationship between the alcohol concentration in the fuel mf and the retard amount of the ignition timing of the spark plug 7 (a retard amount as compared with the normal catalyst warm-up operation). Map data corresponding to f3 is recorded. In the third relational expression f3, the alcohol concentration increases and the ignition timing retard amount increases until the alcohol concentration reaches the alcohol concentration predetermined value Fr. When the alcohol concentration exceeds the alcohol concentration predetermined value Fr, the alcohol concentration increases. In addition, there is a third relationship that decreases from the retardation amount (maximum retardation amount) in the case of the alcohol concentration predetermined value Fr (see FIG. 5).

  Further, for intake valve closing timing advance control, map data corresponding to the fourth relational expression f4 indicating the relationship between the alcohol concentration in the fuel mf and the advance amount of the intake valve 21 closing timing is recorded. The fourth relational expression f4 has a fourth relation in which the alcohol concentration is increased and the advance amount of the timing for closing the intake valve 21 is increased, that is, the timing for closing the intake valve 21 is advanced (see FIG. 6).

  The ECU 20 sets the injection amount of the fuel mf in the compression stroke during the catalyst warm-up promotion process based on the alcohol concentration and the first relational expression f1, and based on the alcohol concentration and the second relational expression f2, the catalyst The fuel mf injection ratio for the intake stroke and the compression stroke in the compression stroke during the warm-up promotion process is set, and the fuel injection control of the injector 6 is performed.

  When a mixed fuel of gasoline and alcohol is used, vaporization worsens as the alcohol concentration increases (the amount of fuel that does not vaporize increases in the cylinder). For this reason, depending on the form in which the injection amount of the fuel mf in the compression stroke set when the alcohol concentration is the lowest (0%) regardless of the alcohol concentration (normal catalyst warm-up promotion process) or the alcohol concentration Thus, in the form in which the fuel injection amount in the intake stroke is increased, the fuel injection amount is not sufficient, and the air-fuel ratio around the spark plug 7 may become leaner than the target air-fuel ratio, which may impair combustion stability.

  In this embodiment, since the injection amount in the compression stroke increases as the alcohol concentration increases, fuel (gasoline) with good evaporation characteristics is sufficiently supplied into the cylinder, stratified combustion is established, and vaporization deterioration (fuel that does not vaporize) It is possible to suppress the dilution of the air-fuel mixture that accompanies this increase.

  However, if the injection amount in the compression stroke is increased as the alcohol concentration increases, the fuel that is not vaporized (particularly alcohol fuel) increases because the alcohol concentration is high. Therefore, problems such as poor ignition, oil dilution, and galling of the piston 1a may occur, and the catalyst warm-up acceleration processing may be delayed. In the present embodiment, when the alcohol concentration is equal to or higher than the alcohol concentration predetermined value Fr, the fuel injection amount in the compression stroke is not increased in accordance with the alcohol concentration, but is constant without depending on the alcohol concentration. Decrease the ratio. This has the effect of suppressing the increase in fuel that does not evaporate and suppressing the occurrence of these problems.

  In addition, since the alcohol fuel has a single composition, the amount of vaporization from the alcohol fuel increases rapidly when the in-cylinder temperature exceeds a predetermined temperature. Therefore, in this embodiment, when the cooling water temperature of the engine main body 1 is equal to or higher than a threshold value corresponding to a predetermined temperature, the compression stroke injection amount and the fuel to the compression stroke set when the alcohol concentration is the lowest (0%). A normal catalyst warm-up promotion process is performed using the value of the mf injection ratio (the same applies to the retard amount and advance amount described later). Thereby, it is possible to reduce the compression stroke injection amount of the fuel mf and avoid an over-rich state due to a rapid increase in the vaporization amount.

  Further, the ECU 20 sets the retard amount of the ignition timing of the spark plug 7 during the catalyst warm-up promotion processing based on the alcohol concentration and the third relational expression f3, and performs ignition control of the spark plug 7.

  By utilizing the fact that the combustion speed of alcohol fuel is higher than the combustion speed of gasoline fuel, the retard amount of the ignition timing of the spark plug 7 is increased as the alcohol concentration increases up to the alcohol concentration predetermined value Fr. After the unburned components that could not be burned in the combustion stroke are discharged from the combustion chamber, they are burnt in the exhaust passage 8, and the temperature of the catalytic converter 9 is increased by using the high-temperature exhaust gas generated thereby, The engine performance can be improved (the catalyst warm-up promotion process can be completed quickly).

  When the alcohol concentration is equal to or higher than the alcohol concentration predetermined value Fr, the retard amount is decreased from the maximum retard amount as the alcohol concentration increases. Thereby, it becomes possible to suppress deterioration of vaporization and deterioration of combustion stability (out of the desired A / F range) due to mixture dilution.

  Further, the ECU 20 sets the advance amount of the timing for closing the intake valve 21 during the catalyst warm-up promotion process based on the alcohol concentration and the fourth relational expression f4, and via the variable intake valve timing control mechanism 23. The timing for closing the intake valve 21 is controlled.

  By advancing the timing at which the intake valve 21 is closed as the alcohol concentration increases, the in-cylinder temperature can be raised, and deterioration of vaporization due to the increased alcohol concentration can be suppressed.

  Next, the procedure of the catalyst warm-up promotion process will be described with reference to the flowchart of FIG. The catalyst warm-up promotion process is performed when the engine body 1 is started. In step S11, it is determined whether or not the starting process is completed in the engine main body 1. If the starting process is completed, it is determined in step S12 whether or not the catalyst warm-up promotion process is necessary. . If the start process has not been completed, the processes after step S12 are not performed. The temperature of the catalytic converter 9 is low, such as until a certain period after the engine body 1 is started (during the first idle after the cold start), the catalytic converter 9 is not in an active state, and predetermined exhaust purification performance If it cannot be obtained, it is determined that the catalyst warm-up promotion process is necessary, and the process proceeds to step S13.

The determination as to whether or not the catalyst warm-up promotion process is necessary in step S12 is made based on information on the coolant temperature from the coolant temperature sensor 26. Specifically, when the cooling water temperature is equal to or higher than the temperature threshold value for determining the catalyst warm-up promotion process, it is determined that the temperature of the catalytic converter 9 is also high and the catalyst warm-up promotion process is unnecessary, and the steps after step S13 are performed. No processing is performed. When the cooling water temperature is lower than the catalyst warm-up acceleration process determination temperature threshold, it is determined that the temperature of the catalytic converter 9 is also low and the catalyst warm-up acceleration process is necessary, and the process proceeds to step S13. The determination as to whether or not the catalyst warm-up promotion processing is necessary is not limited to the cooling water temperature, but other detection means such as a detection signal of an O ₂ sensor (not shown) provided downstream of the three-way catalyst in the catalytic converter 9 is used. It may be based on changes.

  In step S <b> 13, the ECU 20 determines whether or not the cooling water temperature of the engine body 1 is equal to or higher than a threshold based on the information regarding the cooling water temperature from the water temperature sensor 26. The threshold value in step S13 is set to a value lower than the catalyst warm-up acceleration process determination threshold value in step S12. If it is equal to or higher than the threshold value, the in-cylinder temperature is high and the problem of deterioration of alcohol vaporization is unlikely to occur. Therefore, in step S14, a fixed value that is not linked to the alcohol concentration value of the fuel mf Of the compression stroke to the compression stroke, the injection amount, the ignition timing retard amount of the spark plug 7, and the timing advance amount of closing the intake valve 21 are used to promote normal catalyst warm-up. Processing is performed.

  If it is not equal to or higher than the threshold value, the in-cylinder temperature is low and the problem of deterioration of alcohol vaporization is likely to occur. The catalyst warm-up promotion processing is performed using the ratio, the compression stroke injection amount, the ignition timing retard amount of the spark plug 7, and the timing advance amount of closing the intake valve 21.

  In step S15, it is determined whether or not the normal catalyst warm-up promotion process has been completed. The determination as to whether or not the completion is the same as the determination as to whether or not the catalyst warm-up promotion process is necessary in step S12. If completed, the engine body 1 is put into a normal operation state in step S16. If not completed, the process returns to step S14.

  In step S17, the ECU 20 calculates the value of the alcohol concentration based on the information regarding the alcohol concentration of the fuel mf from the alcohol concentration sensor 30. In step S18, based on the alcohol concentration and the fourth relational expression f4, an advance amount of timing for closing the intake valve 21 during the catalyst warm-up promotion process is calculated. Based on the calculated advance amount, the timing of closing the intake valve 21 via the variable intake valve timing control mechanism 23 is controlled.

  In step S19, based on the alcohol concentration and the first relational expression f1, the injection amount of the fuel mf in the compression stroke during the catalyst warm-up promotion process is calculated. Based on the alcohol concentration and the second relational expression f2, The ratio of fuel mf injection to the compression stroke in the intake stroke and the compression stroke during the catalyst warm-up promotion process is calculated. Fuel injection control in the injector 6 is performed based on the calculated injection ratio and the compression stroke injection amount.

  In step S20, based on the alcohol concentration and the third relational expression f3, the retard amount of the ignition timing of the spark plug 7 during the catalyst warm-up promotion process is calculated. Based on the calculated retard amount, ignition timing control of the spark plug 7 is performed.

  In step S21, it is determined whether or not the catalyst warm-up promotion process according to the alcohol concentration is completed. The determination as to whether or not the completion is the same as the determination as to whether or not the catalyst warm-up promotion process is necessary in step S12. If completed, the engine body 1 is put into a normal operation state in step S16. If not completed, the process returns to step S17.

  According to the above procedure, the normal catalyst warm-up promoting process and the catalyst warm-up promoting process performed in a state where the injection amount and the like are adjusted according to the alcohol concentration are switched according to the cooling water temperature.

It is a block diagram of the part regarding intake and exhaust of the fuel injection direction control system in the present embodiment. It is a block diagram of the part regarding the fuel supply of the fuel injection direction control system in this embodiment. It is a graph which shows a 1st relational expression. It is a graph which shows a 2nd relational expression. It is a graph which shows a 3rd relational expression. It is a graph which shows a 4th relational expression. It is a flowchart which shows the procedure of a catalyst warm-up promotion process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine main body 2 Air cleaner 3 Intake passage 4 Electric control throttle valve 6 Injector 7 Spark plug 8 Exhaust passage 9 Catalytic converter 10 Electric control EGR valve 11 EGR passage 12 Fuel tank 13 Low pressure pump 15 High pressure pump 16 Fuel distribution pipe 17 Return passage 20 ECU
21 Intake valve 22 Exhaust valve 23 Variable intake valve timing control mechanism 26 Water temperature sensor 27 Air-fuel ratio sensor 30 Alcohol concentration sensor

Claims (6)

An in-cylinder injector that injects fuel in the intake stroke and the compression stroke during the catalyst warm-up acceleration processing for activating the catalytic converter;
A sensor for detecting an alcohol concentration in the fuel;
A control unit that controls an injection amount of the fuel in the compression stroke based on information on the alcohol concentration from the sensor;
The alcohol concentration and the injection amount are such that, until the alcohol concentration exceeds a predetermined value, the injection amount increases according to the alcohol concentration, and when the alcohol concentration exceeds the predetermined value, the injection amount regardless of the alcohol concentration. A control system for a direct-injection engine characterized by having a first relationship in which is constant. A temperature sensor for detecting the temperature of the direct injection engine;
When the temperature is equal to or higher than a threshold value, the control unit has a low alcohol concentration in the first relationship as an injection amount in the compression stroke during the catalyst warm-up promotion process regardless of the alcohol concentration. The control system according to claim 1, wherein the injection amount is used. The control unit controls, based on information on the alcohol concentration from the sensor, a ratio of the fuel sprayed to the compression stroke in the intake stroke and the compression stroke during the catalyst warm-up promotion process,
The alcohol concentration and the spray distribution ratio are increased until the alcohol concentration exceeds the predetermined value, and the spray distribution ratio increases according to the alcohol concentration, and when the alcohol concentration exceeds the predetermined value, according to the alcohol concentration. 2. The control system according to claim 1, wherein the control system has a second relationship in which the ejection ratio decreases. A temperature sensor for detecting the temperature of the direct injection engine;
When the temperature is equal to or higher than the threshold value, the control unit separates injection of the fuel into the compression stroke in the intake stroke and the compression stroke during the catalyst warm-up promotion process regardless of the alcohol concentration. The control system according to claim 1, wherein the ratio is set low. A spark plug that ignites in a state where the ignition timing is retarded during the catalyst warm-up acceleration processing;
The control unit controls a retard amount of the ignition timing based on information on the alcohol concentration from the sensor,
The alcohol concentration and the retardation amount are increased until the alcohol concentration exceeds the predetermined value, and the retardation amount increases according to the alcohol concentration. The control system according to claim 1, wherein the control system has a third relationship in which the retardation amount decreases. An intake valve that closes in an advanced state during the catalyst warm-up promotion process;
The control unit controls an advance amount of timing for closing the intake valve based on information on the alcohol concentration from the sensor,
The control system according to claim 1, wherein the alcohol concentration and the advance amount have a fourth relationship in which the advance amount increases in accordance with the alcohol concentration.

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