JP2008303788A - Automatic stop device of internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic stop device of an engine capable of smoothly eliminating a sense of incongruity of a driver, by quickly and frequently performing idling stop control, when the engine becomes an idling operation state, when automatically stopping the engine. <P>SOLUTION: When a learning history of the past control quantity of the engine exists in cold starting when a learning performing condition is not realized, and when a history of already performing the idling stop control of the engine exists in a present trip after warming up the engine, or when learning of a control valve of the engine 1 is completed when the learning performing condition of the engine is realized in the preset trip after starting the engine, an idling stop is permitted, and the performance of the idling stop control is commanded to an engine ECU just after an idling stop condition is realized. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an automatic stop device for an internal combustion engine. In particular, the present invention eliminates a sense of discomfort to the driver by increasing the opportunities for internal combustion engine automatic stop control in an automatic stop device for automatically stopping the engine, for example, during idling operation of an internal combustion engine for an automobile (hereinafter referred to as an engine). It relates to measures to be taken.

  When a car travels in an urban area or the like and stops due to waiting for a traffic signal at an intersection, the engine enters an idling state, and fuel is wasted during that time. In view of this point, so-called “idling stop control” that stops the engine by stopping the fuel supply to the combustion chamber (so-called fuel cut) has been performed in the past when certain conditions such as when the automobile stops are satisfied. (See, for example, Patent Document 1 below).

  In addition, from the state where the engine is stopped by this “idling stop control” (hereinafter, this state is called the idling stop state), for example, in the case of an automatic transmission vehicle, When a shift lever operation, a clutch pedal depression operation for a manual transmission vehicle, etc.) is established, the starter mechanism is driven, the drive force is transmitted to the engine (so-called cranking), and the engine is restarted. I try to let them.

  However, such idling stop control is performed after a learning execution condition for performing learning of the engine control amount, for example, a condition that the coolant temperature reaches a predetermined temperature (about 80 ° C.) is satisfied. This is executed after the idling stop condition is satisfied. For this reason, in order to execute the idling stop control, it is necessary to complete the learning of the engine control amount during the current trip after the engine is started, and the engine is in the idling operation state. However, the idling stop control is not executed until the learning of the engine control amount is completed.

Therefore, even if the learning execution condition is not satisfied during the current trip after the engine is started and the learning of the engine control amount is not completed, if a predetermined time elapses after the idling stop condition is satisfied, There is one that performs idling stop control (see, for example, Patent Document 2).
JP 2002-70699 A JP 2004-52599 A

  However, in the latter case, the idling stop control can be executed even if learning of the control amount of the internal combustion engine such as the engine is not completed. However, the idling stop control satisfies the engine idling stop condition. It will not be executed until the predetermined time has elapsed.

  Therefore, the idling stop control is prohibited until the predetermined time elapses after the engine idling stop condition is satisfied, and the idling stop control is not immediately executed when the engine enters the idling operation state. The driver will feel uncomfortable.

  The present invention has been made in view of the above points, and the object of the present invention is to smoothly and quickly perform idling stop control when the engine is in an idling operation state, thereby smoothly eliminating the driver's uncomfortable feeling. It is an object of the present invention to provide an automatic engine stop device.

  In order to achieve the above object, the present invention is premised on an automatic engine stop device for executing an internal combustion engine automatic stop control for stopping the engine drive after the internal combustion engine automatic stop condition is satisfied. A determination unit that determines whether or not there is a learning history of a past control amount of the engine at a cold start of the engine in which a learning execution condition for executing the control amount learning of the engine is not satisfied; and Automatic stop control execution command means for instructing execution of the internal combustion engine automatic stop control immediately after the internal combustion engine automatic stop condition is satisfied when it is determined that a learning history of the past control amount of the engine exists. And. As a specific example of the learning execution condition, the learning execution condition is that the engine coolant temperature is equal to or higher than a predetermined temperature, and the learning execution condition is established when the engine cooling water temperature is equal to or higher than the predetermined temperature. Yes.

  Due to this specific matter, even when the engine is cold-started when the learning execution condition is not satisfied, if the learning history of the past control amount of the engine exists, the internal combustion engine automatic stop condition is satisfied immediately after the internal combustion engine automatic stop condition is satisfied. Since the engine automatic stop control is instructed to execute, the engine except for the situation where the learning history of the past control amount of the engine does not exist, for example, the case where the learning history of the past control amount of the engine is erased due to battery replacement, etc. Even during the cold start, the internal combustion engine automatic stop control is immediately executed. As a result, when the internal combustion engine automatic stop condition is satisfied, the internal combustion engine automatic stop control is performed promptly and frequently, and the driver's uncomfortable feeling can be smoothly eliminated.

  Moreover, the following structures are mentioned as conditions for performing internal combustion engine automatic stop control. That is, when it is determined by the determination means that there is a history of execution of the internal combustion engine automatic stop control during the current trip after the engine warms up, or the current after the engine is started When it is determined that the learning execution condition of the engine is satisfied and the learning of the control amount of the engine is completed during the trip, the internal combustion engine automatic stop control is performed immediately after the internal combustion engine automatic stop condition is satisfied. Execution is commanded by the automatic stop control execution command means.

  Due to this specific matter, there is a history that the internal combustion engine automatic stop control was executed during the current trip after the engine warms up, or the engine learning execution condition is satisfied during the current trip after the engine is started. If learning of the engine control amount is completed, the internal combustion engine automatic stop control is executed immediately after the internal combustion engine automatic stop condition is satisfied. In other words, if the engine learning execution condition is satisfied during the current trip and the learning of the engine control amount is completed, the internal combustion engine automatic stop control is executed even once during the current trip. Thereafter, the automatic stop control of the internal combustion engine is immediately executed. For this reason, during the current trip after the cold start of the engine, although the internal combustion engine automatic stop control is executed due to the existence of the learning history of the past control amount of the engine, the learning execution condition is set after that. The failure that the internal combustion engine automatic stop control is not executed even if the internal combustion engine automatic stop condition is satisfied is eliminated because the internal combustion engine automatic stop condition is satisfied. Thereby, when the internal combustion engine automatic stop condition is satisfied, the internal combustion engine automatic stop control is performed more frequently, and the driver's uncomfortable feeling can be further eliminated.

  Other conditions for executing the internal combustion engine automatic stop control include the following configurations. That is, when it is determined by the determination means that the learning execution condition is satisfied during the current trip and the learning of the engine control amount is completed during the restart after the engine warms up, the internal combustion engine Immediately after the engine automatic stop condition is satisfied, execution of the internal combustion engine automatic stop control is instructed by the automatic stop control execution command means.

  If the learning execution condition is satisfied during the current trip when the engine is restarted after the engine is warmed up and learning of the engine control amount is not completed, Since the internal combustion engine automatic stop control is not executed, the learning history of the past control amount of the engine does not exist (the learning history of the past control amount of the engine has been erased due to battery replacement), or the learning history remains old If it remains and is not expected to match the current control amount due to changes over time, etc., the internal combustion engine will not automatically operate until the learning execution condition is satisfied and learning of the engine control amount is completed during the current trip. Even immediately after the stop condition is satisfied, the internal combustion engine automatic stop control is prohibited. Thereby, it is possible to make the engine ECU always recognize the current control learning amount, and it is possible to prevent problems caused by control deviation.

  Furthermore, as an application form of the engine automatic stop device according to each of the above-described solving means, specifically, it may be applied to automatically stop an engine mounted on an automobile that performs an idling stop control operation. That is, the vehicle is mounted on an automobile that performs an idling stop control operation that automatically stops the engine when an idling stop condition is satisfied while the vehicle is stopped.

  In short, even when the engine is cold-started when the learning execution condition is not satisfied, if the learning history of the past control amount of the engine exists, the internal combustion engine immediately after the internal combustion engine automatic stop condition is satisfied. By commanding execution of automatic stop control, the internal combustion engine automatic stop control is immediately executed even when the engine is cold started, except in the case where there is no learning history of the past control amount of the engine. When the engine is in the idling operation state, the internal combustion engine automatic stop control can be performed quickly and frequently to smoothly eliminate the driver's uncomfortable feeling.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, a case where the present invention is applied to a multi-cylinder (for example, four-cylinder) gasoline engine mounted on an automobile will be described.

-Engine configuration description-
First, a schematic configuration of an engine (internal combustion engine) according to the present embodiment will be described with reference to FIG. As shown in FIG. 1, the engine 1 according to the present embodiment includes a cylinder block 11 having cylinder bores 11 a for four cylinders (only one cylinder is shown in FIG. 1), and a cylinder head 12. Each cylinder bore 11a is provided with a piston 13 provided so as to be movable up and down, and this piston 13 is connected to a crankshaft 15 which is an output shaft of the engine 1 via a connecting rod (connecting rod) 14. A combustion chamber 16 is defined by a space surrounded by the piston 13 and the cylinder head 12 inside the cylinder bore 11a.

  A spark plug 17 is attached to the cylinder head 12 corresponding to each combustion chamber 16. The cylinder head 12 is provided with an intake port 12a and an exhaust port 12b communicating with each combustion chamber 16, and an intake passage 2 and an exhaust passage 3 are connected to the intake port 12a and the exhaust port 12b, respectively. . An intake valve 21 and an exhaust valve 31 are provided at the respective open ends of the intake port 12a and the exhaust port 12b that communicate with the combustion chamber 16. The intake valve 21 and the exhaust valve 31 are opened and closed by an intake camshaft 22 and an exhaust camshaft 32 that are respectively rotated by the power of the crankshaft 15. The power of the crankshaft 15 is transmitted to the intake camshaft 22 and the exhaust camshaft 32 via the timing belt 15a and the timing pulleys 23 and 33.

  In the vicinity of the intake port 12a, an injector 18 is provided corresponding to each cylinder. Each injector 18 is supplied with fuel at a predetermined pressure via a fuel supply system.

  On the other hand, a surge tank 24 is provided in the intake passage 2, and a throttle valve 26 that is opened and closed by a throttle motor 26 a that is driven in response to an operation of an accelerator pedal 25 is provided on the upstream side of the surge tank 24. The amount of intake air introduced into the intake passage 2 is adjusted according to the opening of the throttle valve 26. Furthermore, an air cleaner 27 for purifying the intake air is provided on the upstream side of the throttle valve 26.

  When the operation of the engine 1 is started, the intake air is introduced into the intake passage 2 and fuel is injected from the injector 18, whereby the intake air and the fuel are mixed to form an air-fuel mixture. In the intake stroke of the engine 1, the intake port 12a is opened by the intake valve 21, whereby the air-fuel mixture is taken into the combustion chamber 16 through the intake port 12a. The air-fuel mixture taken into the combustion chamber 16 is compressed in the compression stroke, and then ignited by the spark plug 17, and the air-fuel mixture explodes and burns, and a driving force is applied to the crankshaft 15 (expansion stroke). . The exhaust gas after combustion is discharged to the exhaust passage 3 (exhaust stroke) when the exhaust port 12b is opened by the exhaust valve 31 and further purified through the catalyst 34 and then released to the outside. The ignition plug 17 performs an ignition operation on the air-fuel mixture in accordance with the application timing of the high voltage output from the igniter 17a.

-Description of control block-
The operating state of the engine 1 is controlled by an engine ECU (Electronic Control Unit) 4 as a determination unit. As shown in FIG. 2, the engine ECU 4 includes a CPU (Central Processing Unit) 41, a ROM (Read Only Memory) 42, a RAM (Random Access Memory) 43, a backup RAM 44, and the like.

  The ROM 42 stores various control programs, maps that are referred to when the various control programs are executed, and the like. The CPU 41 executes arithmetic processing based on various control programs and maps stored in the ROM 42.

  The RAM 43 is a memory that temporarily stores calculation results in the CPU 41, data input from each sensor, and the like. The backup RAM 44 is a non-volatile memory that stores data to be saved when the engine 1 is stopped. is there. The ROM 42, CPU 41, RAM 43, and backup RAM 44 are connected to each other via a bus 47, and are connected to an external input circuit 45 and an external output circuit 46.

  A water temperature sensor 51, an air flow meter 52, an intake air temperature sensor 53, an O2 sensor 54, a throttle position sensor 55, a crank angle sensor 56, a cam angle sensor 57, a knock sensor 58, and an intake pressure sensor 59 are connected to the external input circuit 45. ing. On the other hand, the injector 18, the igniter 17a, the throttle motor 26a for driving the throttle valve 26, and the like are connected to the external output circuit 46.

  The water temperature sensor 51 detects the temperature of the cooling water flowing in the water jacket 11b formed in the cylinder block 11, and transmits the cooling water temperature signal to the engine ECU 4.

  The air flow meter 52 detects the intake air amount and transmits the intake air amount signal to the engine ECU 4.

The intake air temperature sensor 53 is provided integrally with the air flow meter 52, detects the intake air temperature, and transmits the intake air temperature signal to the engine ECU 4.
The O2 sensor 54 detects the oxygen concentration in the exhaust, determines whether the air-fuel ratio in the exhaust is at the stoichiometric air-fuel ratio, and transmits a determination signal to the engine ECU 4.

  The throttle position sensor 55 detects the opening of the throttle valve 26 and transmits a throttle opening detection signal to the engine ECU 4.

  The crank angle sensor 56 is disposed in the vicinity of the crankshaft 15 and detects the rotation angle (crank angle CA) and the rotation speed (engine rotation speed NE) of the crankshaft 15. Specifically, the crank angle sensor 56 outputs a pulse signal every predetermined crank angle (for example, 30 °). As an example of the crank angle detection method by the crank angle sensor 56, external teeth are formed at intervals of 30 ° on the outer peripheral surface of the rotor (NE rotor) integrated with the crankshaft 15 and face the external teeth. The crank angle sensor 56 composed of an electromagnetic pickup is disposed. When the external teeth pass near the crank angle sensor 56 as the crankshaft 15 rotates, the crank angle sensor 56 generates an output pulse. In addition, as this NE rotor, the thing in which the external teeth formed in an outer peripheral surface are formed every 10 degrees may be applied. In this case, frequency division is performed in the ECU to generate output pulses every 30 ° CA.

  The cam angle sensor 57 is disposed in the vicinity of the intake camshaft 22 and is used as a cylinder discrimination sensor by outputting a pulse signal corresponding to the compression top dead center (TDC) of the first cylinder # 1, for example. The That is, the cam angle sensor 57 outputs a pulse signal for each rotation of the intake camshaft 22. As an example of a cam angle detection method by the cam angle sensor 57, an external tooth is formed at one place on the outer peripheral surface of the rotor integrally formed with the intake camshaft 22, and the external teeth are faced with an electromagnetic pickup. The cam angle sensor 57 is arranged, and when the external teeth pass in the vicinity of the cam angle sensor 57 as the intake cam shaft 22 rotates, the cam angle sensor 57 generates an output pulse. . Since this rotor rotates at a half rotational speed of the crankshaft 15, an output pulse is generated every time the crankshaft 15 rotates 720 °. In other words, an output pulse is generated each time a specific cylinder reaches the same stroke (for example, when the first cylinder # 1 reaches compression top dead center).

  The knock sensor 58 is a vibration sensor that detects the vibration of the engine transmitted to the cylinder block 11 by a piezoelectric element type (piezo element type) or an electromagnetic type (magnet, coil).

  The intake pressure sensor 59 is provided in the surge tank 24, detects the pressure in the intake passage 2 (intake pipe pressure), and transmits the intake pressure signal to the engine ECU 4.

  And engine ECU4 performs various control of the engine 1 by controlling each part, such as the igniter 17a, the injector 18, and the throttle motor 26a, based on the output signal of the said various sensors 51-59.

  As an example, for the fuel injection control of the injector 18, the target air-fuel ratio is calculated based on the engine load, the engine speed, etc., and the target air-fuel ratio is obtained based on the intake air amount detected by the air flow meter 52. Thus, control of the fuel injection amount (control of the valve opening time of the injector 18) is performed. Further, as the drive control of the throttle motor 26a, based on the opening degree of the accelerator pedal 25 operated by the driver, the opening degree of the throttle valve 26 that is the intake air amount for obtaining the requested engine output is obtained. Thus, the drive amount of the throttle motor 26a is controlled.

-System configuration for idling stop control-
The automobile according to the present embodiment stops the ignition operation of the spark plug 17 (ignition cut) and stops the fuel supply from the injector 18 (fuel cut) when the vehicle is temporarily stopped, such as waiting for a signal at an intersection. The engine 1 is stopped so-called idling stop control is performed. Hereinafter, a system configuration for performing the idling stop control will be described.

  As shown in FIG. 1, the engine ECU 4 is connected to an idling stop controller 48 as an automatic stop control execution command means for commanding execution of idling stop control. The idling stop controller 48 transmits an ignition cut signal and a fuel cut signal to the engine ECU 4 when an idling stop condition (internal combustion engine automatic stop condition) is satisfied. On the other hand, when the engine start condition (idling stop cancel condition) is satisfied, the idling stop controller 48 transmits an ignition cut cancel signal and a fuel cut cancel signal to the engine ECU 4 and simultaneously transmits a start control signal to the starter 19. It is supposed to be.

  The idling stop controller 48 also receives a vehicle speed detection signal from the vehicle speed sensor 48a, a shift position signal from the shift lever position sensor 48b, a brake pedal depression signal and a brake pedal depression release signal from the brake pedal sensor 48c. It is like that. Further, in the engine ECU 4, whether or not the learning execution condition for executing the learning of the control value (control amount) of the engine 1 during idling rotation is established is determined based on the cooling water temperature signal detected by the water temperature sensor 51. The Specifically, if the coolant temperature signal detected by the coolant temperature sensor 51 is less than a predetermined temperature (for example, 80 ° C.), the learning execution condition for executing the learning of the control value of the engine 1 during idling rotation is not satisfied. On the other hand, if the coolant temperature signal is equal to or higher than a predetermined temperature (for example, 80 ° C.), it is determined that a learning execution condition for learning the control value of the engine 1 during idling rotation is satisfied. A determination signal indicating whether or not the learning execution condition is satisfied by the engine ECU 4 is input to the idling stop controller 48. The learning of the control value of the engine 1 during idling rotation uses learning about convergence in feedback control with respect to the air-fuel ratio (A / F) and learning about convergence in feedback control of the idling rotation maintenance flow rate ISC. ing.

  Then, the engine ECU 4 determines whether or not a learning history of the control value of the engine 1 exists during the past trip before the current trip at the cold start of the engine 1 where the learning execution condition is not satisfied. is doing. Then, as shown in FIG. 3, when the learning history of the control value of the engine 1 exists during the past trip before the current trip, the past learning history flag is ON. The existence signal of the learning history is input to the idling stop controller 48. In the idling stop controller 48, idling stop control is permitted by inputting a learning history presence signal, and the engine ECU 4 is instructed to execute idling stop control immediately after the idling stop condition is satisfied.

  Further, the engine ECU 4 determines whether idling stop control has been executed during the current trip. When idling stop control is executed during the current trip, the past idling stop history flag during the current trip is turned ON, and idling stop control is already executed during the current trip, and idling stop control is performed. Since the history exists, the idling stop history present signal during the trip is input to the idling stop controller 48. The idling stop history presence signal during the current trip does not matter whether it is during cold start when the coolant temperature signal is lower than a predetermined temperature (before warming up) or after the engine 1 is warmed up when the coolant temperature signal is equal to or higher than the predetermined temperature. If there is a history in which the idling stop control of the engine 1 has already been executed during the current trip, it is input to the idling stop controller 48. In the idling stop controller 48, idling stop control is permitted when the idling stop history present signal during the trip is input, and the engine ECU 4 is instructed to execute idling stop control immediately after the idling stop condition is satisfied.

  On the other hand, in the engine ECU 4, as shown in FIG. 4, there is a learning history of the control value of the engine 1 during the past trip before the current trip at the cold start of the engine 1 where the learning execution condition is not satisfied. If not, the past learning history flag is OFF. For this reason, when the learning execution condition of the engine 1 is satisfied and the learning of the control value of the engine 1 is completed after the engine 1 is warmed up so that the coolant temperature signal becomes equal to or higher than a predetermined temperature during the current trip after the engine 1 is started. Then, it is input to the idling stop controller 48 as a learning completion signal. When this learning completion signal is input to the idling stop controller 48, the learning completion flag in the current trip is turned on. At the same time, the past learning history flag is turned on and the idling stop of the automobile is permitted. . Further, in the engine ECU 4, when the learning execution condition is satisfied during the current trip and the learning of the control value of the engine 1 is completed during the restart after the engine 1 is warmed up, the idling stop controller 48 is used as a learning completion signal. Is input. In the idling stop controller 48, idling stop is permitted by inputting a learning completion signal, and the engine ECU 4 is instructed to execute idling stop control immediately after the idling stop condition is satisfied. In this case, the learning history of the control value of the engine 1 during the past trip is stored in the RAM 43 as the learning history of the latest control value of the engine 1 during the past trip, and the stored learning history is during the current trip. Are also updated sequentially. Further, the history that the idling stop control of the engine 1 during the current trip has already been executed is also stored in the RAM 43 as an idling stop history present signal during the current trip.

  The idling stop condition of the automobile according to the present embodiment is that, after the idling stop is permitted by the idling stop controller 48 to which the signal based on the learning history of the control value of the engine 1 described above is input, the ignition is ON, for example, It is established when it is detected that the vehicle speed is "0" by the vehicle speed detection signal from the vehicle speed sensor 48a and that the brake pedal is depressed by the brake pedal depression signal from the brake pedal sensor 48c. To do. When this idling stop condition is satisfied, the idling stop controller 48 immediately transmits an ignition cut signal and a fuel cut signal to the engine ECU 4. Further, along with the transmission of the ignition cut signal and the fuel cut signal, the engine ECU 4 performs control to stop the ignition operation of the spark plug 17 and then performs control to stop the fuel injection operation of the injector 18 to stop the engine. Start operation immediately.

  On the other hand, the engine start condition for starting the engine 1 from the state in which the engine 1 is stopped by the idling stop control is determined by the brake pedal depression release signal from the brake pedal sensor 48c after the idling stop condition is satisfied. It is detected that the pedal depressing operation has been performed, or the shift lever is in either the “N (neutral)” position or the “P (parking)” position based on the shift position signal from the shift lever position sensor 48b. To the travel range position ("D (drive)" position, "1 (first speed)" position, "2 (second speed)" position, "R (reverse)" position) This is established when it is detected that an operation has been performed. When this engine start condition is satisfied, the idling stop controller 48 transmits an ignition cut cancel signal and a fuel cut cancel signal to the engine ECU 4 and simultaneously transmits a start control signal to the starter 19. The engine ECU 4 that has received the ignition cut release signal and the fuel cut release signal performs control to start the ignition operation of the spark plug 17 and start the fuel injection operation of the injector 18. Further, the starter motor 19a of the starter 19 is actuated by the start control signal, and the engine 1 is cranked.

  Next, the control flow by the idling stop controller 48 in the case where the idling stop is permitted by the input of the learning history existence presence signal, the current trip idling stop history presence signal, and the learning completion signal described above is based on the flowchart of FIG. I will explain. In this case, after the signal based on the learning history of the control value of the engine 1 is detected, it is detected that the vehicle speed is “0” by the vehicle speed detection signal when the ignition is ON, and the brake is depressed by the brake pedal depression signal. It is assumed that the idling stop condition is satisfied when it is detected that the pedal is depressed.

  First, in step ST1 of the flowchart of FIG. 5, after the engine 1 is started, whether or not the cooling water temperature signal indicating the current water temperature detected by the water temperature sensor 51 in step ST2 is equal to or higher than a predetermined temperature Ta (for example, 80 ° C.). Determine whether or not.

  If the determination in step ST2 is NO in which the coolant temperature signal is less than the predetermined temperature Ta, in step ST3, the engine 1 is controlled during the past trip before the current trip at the time of cold start of the engine 1. It is determined whether or not a learning history presence signal is input when there is a value learning history. As shown in FIG. 3, since the learning history in the past trip exists and the past learning history flag is ON as shown in FIG. 3, a determination signal of the past learning history is input. If YES, idling stop is permitted in step ST4. Immediately after the vehicle speed detection signal detects that the vehicle speed is “0” and the brake pedal depression signal is detected to be depressed, that is, immediately after the idling stop condition is satisfied, Command (send) execution of idling stop control to the engine ECU 4. On the other hand, in the case where the determination in step ST3 is NO in which the learning history in the past trip does not exist and the past learning history flag is OFF, and therefore the past learning history existence presence signal is not input. The process returns to step ST2. In this case, in step ST3, the determination that the learning history presence signal during the past trip is not input is determined as NO because the learning history during the past trip is cleared, for example, by replacing the battery. This is the case.

  On the other hand, if the determination in step ST2 is YES when the coolant temperature signal is equal to or higher than the predetermined temperature Ta, the idling stop control of the engine 1 is already executed in step ST5 during the current trip after the engine 1 is warmed up. When the recorded history exists, it is determined whether or not the idling stop history presence signal during trip is input. If the determination in step ST5 is YES when the idling stop control history of the engine 1 exists during the current trip and the idling stop history present signal is currently being input, the process proceeds to step ST4. Allow idling stop. Then, immediately after the idling stop condition is established, the engine ECU 4 is commanded (transmitted) to execute the idling stop control. On the other hand, if the determination in step ST5 is NO in which the idling stop history present signal during trip is not input because the idling stop history of the engine 1 does not exist during the current trip, the process proceeds to step ST6. .

  In this step ST6, whether or not a learning completion signal is inputted when the learning execution condition of the engine 1 is established and learning of the control value of the engine 1 is completed during the current trip after the engine 1 is started. Determine. If the determination in step ST6 is YES when learning of the control value of the engine 1 is completed and a learning completion signal is input, the process proceeds to step ST4 and idling stop is permitted. Then, immediately after the idling stop condition is satisfied, the engine ECU 4 is instructed to execute the idling stop control. On the other hand, if the determination in step ST6 is NO where learning of the control value of the engine 1 is not completed and a learning completion signal is not input, learning of the control value of the engine 1 is completed and learning is completed. Wait until a signal is input.

  Thus, in the above embodiment, idling stop is permitted if there is a learning history of the past control values of the engine 1 even during the cold start of the engine 1 where the learning execution condition is not satisfied. Immediately after the idling stop condition is satisfied, the engine ECU 4 is instructed to execute the idling stop control, so that there is no learning history of the past control values of the engine 1, for example, the past of the engine 1 due to battery replacement. Except for the situation where the learning history of the control value is cleared, the idling stop control is immediately executed if the idle stop condition is satisfied even when the engine 1 is cold started.

  Further, when there is a history that the idling stop control of the engine 1 is executed during the current trip after the engine 1 is warmed up, or during the current trip after the engine 1 is started, the learning execution condition of the engine 1 Is satisfied and learning of the control value of the engine 1 is completed, the idling stop is permitted, and immediately after the idling stop condition is satisfied, the engine ECU 4 is instructed to execute the idling stop control. If the engine 1 learning execution condition is satisfied during the trip and the learning of the control value of the engine 1 is completed, the idling stop control of the engine 1 is executed even once during the current trip. Subsequent idling stop control of engine 1 is also executed. To become. For this reason, during the current trip after the cold start of the engine 1, the idling stop of the engine 1 is executed due to the existence of the learning history of the past control value of the engine 1, but the learning is executed thereafter. The problem that the idling stop control of the engine 1 is not executed because the condition is not satisfied is solved.

  Thereby, when the engine 1 is in the idling operation state, the idling stop control is performed promptly and frequently, and the driver's uncomfortable feeling can be smoothly eliminated.

  Furthermore, if the learning execution condition is satisfied during the current trip and the learning of the control value of the engine 1 is not completed during the restart after the engine 1 is warmed up, idling stop is not permitted, and the idling stop condition is Immediately after establishment, the engine ECU 4 is not instructed to execute the idling stop control, so that there is no learning history of the past control value of the engine 1 (the situation where the learning history of the past control value is cleared by battery replacement). ), Or when the learning history remains old and is not expected to match the current control amount due to changes over time or the like, the learning execution condition is satisfied during the current trip and the control value of the engine 1 is Until the learning is completed, the idling stop control of the engine 1 is prohibited even immediately after the idling stop condition is satisfied. It is. As a result, the current control learning amount can always be recognized by the engine ECU 4, and problems caused by control deviation can be prevented.

  In addition, this invention is not limited to the said embodiment, The other various modifications are included. For example, in the above-described embodiment, the case where the injector 18 is applied to a port injection engine that injects fuel in the intake port 12a has been described. However, the present invention is not limited to this and can be applied to a cylinder injection engine.

  Moreover, although the case where it applied to the 4-cylinder engine 1 was demonstrated in the said embodiment, this invention is not limited to this, For example, it can apply also to the engine of other arbitrary cylinder numbers, such as a 6-cylinder engine. Moreover, the engine to which the present invention is applicable is not limited to an automobile engine.

  Further, in the above embodiment, the idling stop controller 48 is connected to the engine ECU 4 to separate them, but it is needless to say that the engine ECU and the idling stop controller may be integrated.

  Furthermore, in a so-called hybrid vehicle that is equipped with an engine and an electric motor for traveling and travels with one or both of these driving forces, the engine is automatically stopped during driving (driving only the electric motor for traveling). The present invention can also be applied to the start of traveling by force or the start of regenerative operation.

1 is a system configuration diagram showing a schematic configuration of an engine according to an embodiment of the present invention. It is a figure which shows the outline of the control block of an engine. It is a time chart figure which shows the cooling water temperature in case the past learning history flag is ON, the past idling stop history flag, the learning completion flag of the present trip, idling stop permission, an engine state, and an engine speed. It is a time chart figure which shows the cooling water temperature in case the past learning history flag is OFF, the past idling stop history flag, the learning completion flag of the present trip, idling stop permission, an engine state, and an engine speed. It is a flowchart figure which shows the flow of control by the idling stop controller in the case of determining permission of idling stop with the signal based on the learning history of the control value of an engine.

Explanation of symbols

1 engine (internal combustion engine)
4 Engine ECU (determination means)
48 Idling stop controller (automatic stop control execution command means)

Claims (5)

In the internal combustion engine automatic stop device that permits execution of the internal combustion engine automatic stop control for stopping the drive of the internal combustion engine when the internal combustion engine automatic stop condition is satisfied,
A determination means for determining the presence or absence of a learning history of a past control amount of the internal combustion engine at a cold start of the internal combustion engine in which the learning execution condition for executing the control amount learning of the internal combustion engine is not satisfied;
When it is determined by the determination means that a learning history of the past control amount of the internal combustion engine exists, an automatic command for instructing execution of the internal combustion engine automatic stop control immediately after the internal combustion engine automatic stop condition is satisfied. An automatic stop device for an internal combustion engine, comprising stop control execution command means. The automatic stop device for an internal combustion engine according to claim 1,
The determination means includes the presence / absence of a history of execution of the internal combustion engine automatic stop control during the current trip after the internal combustion engine is warmed up, or the internal combustion engine during the current trip after the start of the internal combustion engine. It is also determined whether or not learning execution conditions are satisfied and learning of the control amount of the internal combustion engine is completed,
The automatic stop control execution command means is determined when the determination means determines that there is a history of execution of the internal combustion engine automatic stop control during a current trip after the internal combustion engine is warmed up, or The internal combustion engine automatic stop condition is satisfied when it is determined that the learning execution condition for the internal combustion engine is satisfied during the current trip after the start of the internal combustion engine and learning of the control amount of the internal combustion engine is completed. An automatic stop device for an internal combustion engine instructing execution of the internal combustion engine automatic stop control immediately after the operation. The automatic stop device for an internal combustion engine according to claim 1 or 2,
The determination means also determines whether or not learning execution conditions are satisfied and learning of the control amount of the internal combustion engine is completed during the current trip when the internal combustion engine is warmed up and restarted. ,
The automatic stop control execution command means completes learning of the control amount of the internal combustion engine because the learning execution condition is satisfied during the current trip when the internal combustion engine is warmed up and restarted by the determination means. The internal combustion engine automatic stop device is instructed to execute the internal combustion engine automatic stop control immediately after the internal combustion engine automatic stop condition is satisfied. The automatic stop device for an internal combustion engine according to any one of claims 1 to 3,
The automatic stop device for an internal combustion engine, wherein the learning execution condition is satisfied when a cooling water temperature of the internal combustion engine is equal to or higher than a predetermined temperature. The automatic stop device for an internal combustion engine according to any one of claims 1 to 4,
The internal combustion engine is mounted on an automobile that performs an idling stop control operation that automatically stops the internal combustion engine when an idling stop condition is satisfied while the vehicle is stopped.

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