JP4305266B2 - Control device for internal combustion engine - Google Patents

Description

  The present invention relates to a control device for an internal combustion engine, and more particularly, to a control device that reduces a shock that occurs in response to a change in output required for an internal combustion engine.

  The output of an internal combustion engine (engine) for running a vehicle is controlled by controlling the intake air amount by a throttle and controlling the fuel injection amount by an injector. A required output is transmitted from the travel control system to the engine control system, and the engine control system controls the output of the engine.

  Japanese Patent Laid-Open No. 2001-248477 (Patent Document 1) accurately realizes the target torque calculated on the upstream side of the control regardless of the combustion state, and controls vehicle speed control, inter-vehicle distance control, driving wheel speed control, slip ratio. Disclosed is a vehicle control device that gives control accuracy and responsiveness excellent in control. This automotive control device includes at least a control circuit that controls a vehicle state of any one of a vehicle speed, an inter-vehicle distance, a driving wheel speed, and a slip ratio to follow a target value, and an engine target torque based on the target value. A vehicle state control unit having a calculation circuit for determining the engine, a circuit for determining the fuel injection amount of the engine based on the target torque of the engine, and a target supply to the engine based on the fuel injection amount determined by the vehicle state control unit A circuit for obtaining an air amount, a circuit for detecting an actual supply air amount of the engine, and a circuit for controlling the detected actual supply air amount to become a target supply air amount.

According to this vehicle control device, the fuel injection amount is obtained based on the target torque calculated on the upstream side of the control, and the target supply air amount to the engine is obtained based on the fuel injection amount. Control is performed so that the detected actual supply air amount becomes the target supply air amount. Thus, regardless of the combustion state of the engine, various vehicle conditions such as vehicle speed control, inter-vehicle distance control, drive wheel speed control, and slip rate control can be quickly handled, and excellent control accuracy and responsiveness can be realized.
JP 2001-248477 A

  However, in Patent Document 1, the engine torque is controlled by changing the throttle opening. The control responsiveness in the case of controlling the engine torque by changing the throttle opening is worse than the ignition timing control or the like (the response is slow). Therefore, even if the throttle opening is controlled so as to realize the engine torque calculated on the upstream side of the control, the engine torque may not change at a desired timing. For example, in an automatic transmission, when it is desired to reduce the engine torque before entering the shift transition period, even if the engine torque reduction signal is output and the throttle opening is reduced before the shift transition period, the engine actually Since a delay time occurs until the torque decreases, if the engine torque is changed during the shift transition period and the friction engagement element is released or engaged in this state, the shift shock is increased.

  In addition, when the throttle opening degree control does not function normally, there is a problem that the engine torque cannot be changed.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a control device for an internal combustion engine that can appropriately cope with a change in output demand for the internal combustion engine.

  A control device for an internal combustion engine according to a first aspect of the invention includes a detection means for detecting a current output of the internal combustion engine, a request detection means for detecting a required output for the internal combustion engine, a current output and a required output. And a selecting means for selecting a device based on the magnitude of the difference from a plurality of devices capable of changing the output of the internal combustion engine.

  According to the first invention, even if the device is capable of changing the output of the internal combustion engine by judging that the urgency of the control is high when the difference between the current output and the required output of the internal combustion engine is large, it is particularly responsive. It is possible to select a device with high characteristics. As a result, the output of the internal combustion engine can be changed more quickly, and the driver's request can be satisfied quickly. As a result, it is possible to provide a control device for an internal combustion engine that can appropriately cope with a change in output demand for the internal combustion engine.

  In the control apparatus for an internal combustion engine according to the second invention, in addition to the configuration of the first invention, the plurality of devices include a plurality of devices having different responsiveness. The selection means includes means for selecting a device that is more responsive as the difference is greater.

  According to the second invention, among the devices with different responsiveness that can determine that the urgency of the control is high if the difference between the current output and the required output of the internal combustion engine is large, and can change the output of the internal combustion engine. A device with particularly high responsiveness can be selected. For this reason, the output of the internal combustion engine can be changed more quickly.

  The control apparatus for an internal combustion engine according to the third invention further includes means for detecting whether or not a plurality of devices are operable in addition to the configuration of the first invention. When the selection means detects an inoperable device among a plurality of devices, the device is selected from the devices other than the inoperable devices in the plurality of devices in the order of least influence on the behavior of the internal combustion engine. Means for doing so.

  According to the third aspect of the invention, it is possible to preferentially select a device that has little influence on the behavior of the internal combustion engine, even if it is a device that changes the output of the internal combustion engine, excluding devices that cannot be operated. . Therefore, the influence on the behavior of the vehicle can be reduced.

  The control apparatus for an internal combustion engine according to the fourth invention further includes a control means for controlling the selected device in addition to the configuration of any one of the first to third inventions. The control means includes means for setting a control target value for the selected device based on the magnitude of the difference.

  According to the fourth aspect of the present invention, if there is a deviation (difference) between the current output and the requested output, the selected device is operated with the requested output as the control target value so that the deviation becomes zero. Feedback control and the like can be executed.

  The control apparatus for an internal combustion engine according to the fifth invention further includes a control means for controlling the selected device in addition to the configuration of any one of the first to third inventions. The control means includes means for setting a control target value for the selected device based on the magnitude of the difference and the responsiveness of the selected device.

  According to the fifth invention, if there is a deviation (difference) between the current output and the requested output, the selected device is operated with the requested output as the control target value, so that the deviation becomes zero. Feedback control and the like can be executed. At this time, a device with particularly low control responsiveness can increase the control target value so that the deviation becomes zero quickly.

  The control apparatus for an internal combustion engine according to a sixth aspect of the present invention further includes control means for controlling the selected device in addition to the configuration of any one of the first to third aspects of the invention. The control means includes means for determining when to start control of the selected device based on the magnitude of the difference.

  According to the sixth invention, when the deviation between the current output and the required output is large, the feedback control is performed so that the operation timing of the selected device is advanced by using the required output as the control target value, and the deviation becomes 0 quickly. Etc. can be executed.

  The control apparatus for an internal combustion engine according to the seventh invention further includes control means for controlling the selected device in addition to the configuration of any one of the first to third inventions. The control means includes means for determining when to start control of the selected device based on the magnitude of the difference and the responsiveness of the selected device.

  According to the seventh invention, when the deviation between the current output and the requested output is large, the feedback control is performed so that the operation timing of the selected device is advanced by using the requested output as the control target value, and the deviation is quickly reduced to zero. Etc. can be executed. At this time, a device with particularly low control responsiveness can advance the control start timing so that the deviation becomes zero quickly.

  In the control apparatus for an internal combustion engine according to the eighth invention, in addition to the configuration of any one of the first to seventh inventions, the device includes a device for changing the output of the internal combustion engine by an ignition timing control function, an air-fuel ratio control function Is a device that changes the output of the internal combustion engine, a device that changes the output of the internal combustion engine by the throttle valve opening control function, or a device that changes the output of the internal combustion engine by the partial fuel cut cylinder control function.

  According to the eighth invention, at least four types of devices having different control responsiveness are appropriately selected based on the magnitude of the difference between the current output and the required output, thereby being suitable for the output request change for the internal combustion engine. It can correspond to.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  FIG. 1 shows a control block diagram of an engine control system including an engine control apparatus according to the present embodiment. The engine control apparatus according to the present embodiment is realized by hardware and software of an engine ECU (Electronic Control Unit).

  The engine 10 mounted on the vehicle includes an intake passage 20 constituting an intake system and an exhaust passage 30 constituting an exhaust system. An air cleaner 40 is provided on the inlet side of the intake passage 20. The downstream side of the intake passage 20 is connected to each cylinder of the engine 10 through a branched intake manifold 20A (the engine 10 in the present embodiment is a four-cylinder engine, but the present invention is not particularly limited to a four-cylinder engine). ).

  In the vicinity of the intake manifold 20A, injectors 50A, 50B, 50C, and 50D for fuel injection are provided corresponding to the respective cylinders. Each of the injectors 50A to 50D is supplied with fuel at a predetermined pressure from a fuel tank (not shown) by the operation of the fuel pump. Each cylinder of the engine 10 is provided with spark plugs 60A, 60B, 60C, 60D.

  The exhaust passage 30 communicates with each cylinder of the engine 10 through a branched exhaust manifold 30A. On the outlet side of the exhaust passage 30, a catalytic converter 70 incorporating a three-way catalyst is provided.

  Outside air is taken into the engine 10 through the air cleaner 40 and the intake passage 20. Simultaneously with the intake of the outside air, fuel is injected from the injectors 50A to 50D to the vicinity of the intake manifold 20A, whereby the mixture of the fuel and the outside air is taken into the combustion chamber of each cylinder. Then, by operating the spark plugs 60A to 60D, the air-fuel mixture explodes and burns in each combustion chamber, whereby pistons, crankshafts and the like (not shown) are operated to obtain driving force of the engine 10, that is, output from the engine 10. be able to. Further, the already burned gas after being burned in each combustion chamber is led to the exhaust passage 30 as exhaust gas, purified by the catalytic converter 70 and then discharged to the outside.

  The engine 10 may be a direct injection engine that injects fuel directly into the combustion chamber at a high pressure.

  A throttle valve 80 is provided in the middle of the intake passage 20. An opening degree signal from an accelerator opening degree sensor 330 that detects the opening degree of the accelerator pedal 100 provided in the driver's seat of the vehicle is input to the engine ECU 510. Engine ECU 510 calculates the throttle opening. The engine ECU 510 controls the operation of the motor 110 as an actuator, whereby the throttle valve 80 is opened and closed. Further, the throttle valve 80 is always biased with a force acting in the closing direction by a return spring (not shown).

As a sensor for detecting various operating states of the vehicle and the engine 10, a throttle opening sensor 320 for detecting the throttle opening is provided in the vicinity of the throttle valve 80. Further, as described above, an accelerator opening sensor 330 for detecting the opening of the accelerator pedal 100 is provided in the vicinity of the accelerator pedal 100. In the intake passage 20, an intake pressure sensor 340 for detecting the intake pipe pressure is provided on the downstream side of the throttle valve 80. Instead of detecting the intake pipe pressure, a system in which an air flow rate sensor is mounted downstream of the air cleaner 40 may be used. In the middle of the exhaust passage 30, an oxygen sensor 350 for detecting the oxygen concentration O _{2 in} the exhaust, that is, the exhaust air-fuel ratio in the exhaust passage 30, is provided. Further, the engine 10 is provided with a water temperature sensor 360 for detecting the temperature of the cooling water, that is, the cooling water temperature.

  An ignition signal distributed by the distributor 120 is applied to the spark plugs 60 </ b> A to 60 </ b> D provided in each cylinder of the engine 10. The distributor 120 distributes the high voltage output from the igniter 130 to the spark plugs 60 </ b> A to 60 </ b> D in synchronization with the crank angle (CA) of the engine 10. And the ignition timing of each spark plug 60A-60D is determined by the high voltage output timing from the igniter 130 controlled by engine ECU510.

  Distributor 120 is provided with a rotational speed sensor 370 for detecting the rotational speed (engine rotational speed) NE of engine 10 from the rotation of a rotor (not shown). Distributor 120 is provided with a cylinder discrimination sensor 380 for detecting a change in the crank angle of engine 10 at a predetermined rate in accordance with the rotation of the rotor. In the present embodiment, it is assumed that the crankshaft rotates twice with respect to a series of strokes (intake stroke, compression stroke, expansion stroke, exhaust stroke) in engine 10, and cylinder discrimination sensor 380 cranks at a rate of 360 ° CA. Detect corners. Instead of the distributor 120, a system without a distributor 120 using a crank angle sensor and a cam angle sensor may be used.

  In addition, in the present embodiment, a pair of left and right drive wheels are provided on the rear side of the vehicle, and a pair of left and right driven wheels are provided on the front side of the vehicle. A pair of left and right drive wheels may be provided on the front side of the vehicle, and a pair of left and right driven wheels may be provided on the rear side of the vehicle. Furthermore, four-wheel drive may be used.

  The driving wheels are driven to rotate by obtaining driving force from the engine 10. For this purpose, an automatic transmission composed of a torque converter 220 and a gear type automatic transmission mechanism 160 is connected to the crankshaft of the engine 10. A driving force is transmitted from the gear-type automatic transmission mechanism 160 to the left and right drive wheels via a propeller shaft, a differential gear, a pair of left and right drive shafts, and the like.

  The gear type automatic transmission mechanism 160 realizes a P position that realizes a parking (parking) state, an R position that realizes a reverse traveling (reverse) state, and a neutral state by switching a shift lever 230 provided in a driver's seat. It is possible to switch to various shift positions, such as an N position to perform, a D position for realizing a forward running (drive) state, and an L position for realizing an engine brake operating state. A shift position sensor 420 that detects the position selected by the driver is attached in conjunction with the position of the shift lever 230. A clutch may be used instead of torque converter 220, and a manual transmission may be used instead of gear automatic transmission mechanism 160.

  On the other hand, the front left and right driven wheels are rotated as the vehicle travels, and are also steered wheels that are actuated by operating a steering wheel (not shown) in order to steer the vehicle. The gear-type automatic transmission mechanism 160 is provided with a vehicle speed sensor 410 for detecting the traveling speed (vehicle speed) of the vehicle. The vehicle speed sensor 410 detects the rotational speed of the output shaft of the gear type automatic transmission mechanism 160 and is converted into a vehicle speed by the engine ECU 510.

  Throttle opening sensor 320, accelerator opening sensor 330, intake pressure sensor 340, oxygen sensor 350, water temperature sensor 360, rotation speed sensor 370, cylinder discrimination sensor 380, vehicle speed sensor 410, and shift position sensor 420 are connected to engine ECU 510. ing. In addition, the engine ECU 510 is connected to each of the injectors 50A to 50D, the igniter 130, and the motor 110 that operates the throttle valve 80.

  Engine ECU 510 controls the operations of injectors 50A to 50D, igniter 130, and the like to execute fuel injection amount control and ignition timing control of engine 10 based on various signals input from various sensors. Further, engine ECU 510 controls the opening degree of throttle valve 80 based on various input signals, or executes partial fuel cut control for stopping fuel supply for each cylinder.

  The electrical configuration of the engine ECU 510 includes a CPU (Central Processing Unit) having a counter function, a read ROM (Read Only Memory) pre-stored with predetermined control programs, maps, tables, and the like, and temporary calculation results of the CPU. A random access memory (RAM), a backup RAM for storing data stored in advance, and the like. Engine ECU 510 is configured as a logical operation circuit in which these CPU, RAM, ROM, backup RAM, external input / output circuit (input / output interface) and the like are connected by an internal bus.

  The external input / output circuit includes a throttle opening sensor 320, an accelerator opening sensor 330, an intake pressure sensor 340, an oxygen sensor 350, a water temperature sensor 360, a rotation speed sensor 370, a cylinder discrimination sensor 380, a vehicle speed sensor 410, and a shift position sensor 420. Are connected to each other. The external input / output circuit is connected to a motor 110 that operates the injectors 50A to 50D, the igniter 130, and the throttle valve 80. The external input / output circuit is connected to an ECT (Electronically Controlled Automatic Transmission) _ECU 520 for controlling the gear type automatic transmission mechanism 160 and a VSC (Vehicle Stability Control) _ECU 530 for performing stable control during turning of the vehicle. An instantaneous engine output request signal is input to engine ECU 510 from ECT_ECU 520 and VSC_ECU 530.

  The CPU of the engine ECU 510 controls various devices for making the output of the engine 10 variable based on the requested engine output calculated by the engine ECU 510 itself or the requested engine output input from the ECT_ECU 520 or the VSC_ECU 530. The engine 10 is controlled so that the output of the engine 10 is as follows. Such devices include a partial fuel cut control device, an ignition angle control device, a throttle valve opening control device, an air-fuel ratio control device, and the like.

  In the partial fuel cut control device, the engine ECU 510 controls the injectors 50A to 50D of the fuel cut target cylinders according to the number of cylinders whose fuel supply is stopped (fuel cut), and executes partial fuel cut. 10 outputs are controlled.

  The ignition angle control device controls the output of the engine 10 by the engine ECU 510 controlling the high voltage output timing from the igniter 130 and controlling the ignition timing in the engine 10.

  The throttle valve opening control device controls the output of the engine 10 by changing the amount of intake air by the engine ECU 510 controlling the opening of the throttle valve 80.

  Based on the signal from the oxygen sensor 350, the air-fuel ratio control device controls the motor 110 for the opening degree of the throttle valve 80 or the engine ECU 510 for controlling the injectors 50A to 50D. Is changed to control the output of the engine 10.

  These control devices are characterized by different control responsiveness when the required output of the engine 10 changes. In order of increasing control responsiveness, a partial fuel cut control device, an ignition angle control device, a throttle valve opening control device, and an air-fuel ratio control device are obtained. In the following description, the partial fuel cut control device is described as a high response device (A), the ignition angle control device as a high response device (B), and the throttle valve opening control device or the air-fuel ratio control device as a low response device. To do.

  Various maps stored in the ROM of engine ECU 510 will be described with reference to FIGS.

  FIG. 2 is a map showing the relationship between the torque of the engine 10 and the opening of the throttle valve 80, FIG. 3 is a map showing the relationship between the torque reduction amount of the engine 10 and the ignition delay amount, and FIG. FIG. 5 is a map showing the relationship between the torque of the engine 10 and the number of partial fuel cut cylinders, and FIG. 5 is a map showing the relationship between the torque increase amount of the engine 10 and the ignition advance amount.

  As shown in FIG. 2, in order to increase the torque of the engine 10, it is only necessary to increase the intake air amount. Therefore, the opening degree of the throttle valve 80 may be greatly opened. As shown in FIG. 3, in order to greatly reduce the engine torque, the ignition timing by the spark plugs 60 </ b> A to 60 </ b> D may be greatly changed to the retard side. As shown in FIG. 4, the number of partial fuel cut cylinders may be increased to reduce the torque of the engine 10, and the number of partial fuel cut cylinders may be decreased to increase the engine torque. As shown in FIG. 4, as described above, the engine 10 is a four-cylinder engine. As shown in FIG. 5, in order to increase the engine torque, the ignition timing by the spark plugs 60 </ b> A to 60 </ b> D may be greatly changed to the advance side.

  A map when a dimensionless number called a response coefficient is used will be described with reference to FIGS. FIG. 6 shows the relationship between the amount of change in torque of the engine 10 and the response coefficient. Based on the map shown in FIG. 6, the response coefficient (dimensionless number) can be determined based on the amount by which the torque of the engine 10 is changed.

  FIG. 7 shows the relationship between the response coefficient and the ignition timing change amount. FIG. 8 shows the relationship between the response coefficient and the throttle opening change amount. When the torque change amount of the engine 10 is determined as shown in FIG. 6, the dimensionless response coefficient is uniquely determined. Using the response coefficient that is uniquely determined, the amount of change in the ignition timing and the amount of change in the throttle opening can be determined with reference to the map shown in FIG. That is, by using maps as shown in FIGS. 6 to 8, the ignition timing change amount, the throttle opening change amount, etc. are determined from the change amount of the engine torque using the dimensionless response coefficient as a parameter. can do.

  With reference to FIG. 9, a control structure of a program executed by engine ECU 510 will be described.

  In step (hereinafter, step is abbreviated as S) 100, engine ECU 510 obtains the current output of engine 10. At this time, for example, engine ECU 510 calculates the intake air amount based on the throttle opening detected by throttle opening sensor 320, and based on a map that defines the relationship between the intake air amount and the output torque of engine 10. The current output of the engine 10 is acquired.

  In S110, engine ECU 510 obtains an instantaneous output request of engine 10. At this time, an instantaneous output request of the engine 10 is obtained by calculating an output request of the engine 10 based on an accelerator opening signal input from an accelerator opening sensor 330 that detects the opening of the accelerator pedal 100. . Further, an instantaneous output request of the engine 10 is acquired based on a signal input from the ECT_ECU 520 or a signal input from the VSC_ECU 530.

  In S120, the urgency of the output change of engine 10 is calculated. At this time, the urgency is calculated by the absolute value of the difference between the current output and the requested output. If the urgency is large if the absolute value is large, it is determined that the urgency is small if the absolute value is small.

  In S130, engine ECU 510 determines whether or not there is a request to increase the output of engine 10. If the instantaneous output request of the engine 10 acquired in S110 is larger than the current output of the engine 10 acquired in S100, it is determined that there is an output increase request. If there is a request to increase the output of engine 10 (YES in S130), the process proceeds to S300. If not (NO in S130), the process proceeds to S200.

  In S200, engine ECU 510 determines whether or not the degree of urgency is large. At this time, if the value obtained by subtracting the instantaneous engine 10 output request from the current engine 10 output is greater than a predetermined threshold value, it is determined that the degree of urgency is high. If the degree of urgency is large (YES in S200), the process proceeds to S210. If not (NO in S200), the process proceeds to S260.

  In S210, engine ECU 510 determines whether or not high-response device (A) is in an operable state. If high-response device (A) is in an operable state (YES in S210), the process proceeds to S220. If not (NO in S210), the process proceeds to S240.

  In S220, engine ECU 510 calculates a control amount of high response device (A) and the like. At this time, the control amount of the high response device (A), the control start timing, and the like are calculated. The control start timing is calculated based on the response performance of the high response device (A).

  In S230, engine ECU 510 outputs an operation command signal to high response device (A). At this time, an operation command signal is output so as to satisfy the control start timing calculated in S220. Thereafter, this process ends.

  In S240, engine ECU 510 calculates the control amount of high-response device (B) and the like because high-response device (A) is not in an operable state. At this time, the selected high response device (B) is preferentially selected from devices that do not affect the behavior of the vehicle as much as possible. Further, the processing in S240 at this time is the same processing as S220 described above, and the control amount and the control start timing are calculated.

  In S250, engine ECU 510 outputs an operation command signal to high response device (B). Thereafter, this process ends.

  In S260, engine ECU 510 calculates the control amount of the low response device and the like. At this time, the control start timing and the like are also calculated based on the response controllability of the low response device.

  In S270, engine ECU 510 outputs an operation command signal to the low response device. Thereafter, this process is terminated.

  In S300, engine ECU 510 determines whether or not the degree of urgency is large. At this time, if the value obtained by subtracting the current output of the engine 10 from the instantaneous output request of the engine 10 acquired in S110 is greater than a predetermined threshold value, it is determined that the degree of urgency is large. If it is determined that the degree of urgency is large (YES in S300), the process proceeds to S310. If not (NO in S300), the process proceeds to S380.

  In S310, engine ECU 510 determines whether or not high response device (A) is in an operable state. If high-response device (A) is in an operable state (YES in S310), the process proceeds to S320. If not (NO in S310), the process proceeds to S360.

  In S320, engine ECU 510 calculates a control amount of the low response device and the like. In S330, engine ECU 510 outputs an operation command signal to the low response device.

  In S340, engine ECU 510 calculates a control amount of high-response device (A) and the like. In S350, engine ECU 510 outputs an operation command signal to high response device (A). Thereafter, this process ends.

  By the processing of S320 to S350, the output of the engine 10 is controlled to increase using both the high response device and the low response device.

  In S360, engine ECU 510 calculates the control amount and delay compensation amount of the low response device. This is because a delay time occurs for the low response device, and the delay compensation amount is calculated, and the operation command signal is output in advance by the delay compensation amount. In S370, engine ECU 510 outputs an operation command signal to the low response device. Thereafter, this process ends.

  In S380, engine ECU 510 calculates a control amount of the low response device and the like. In S390, engine ECU 510 outputs an operation command signal to the low response device. Thereafter, this process ends.

  An operation of the engine control system according to the present embodiment based on the above-described structure and flowchart will be described.

[When there is no output increase request]
For example, since the ECT_ECU 520 enters the shift transition period of the gear type automatic transmission mechanism 160, if a command signal for reducing the torque of the engine 10 is input to the engine ECU 510, it is not determined that there is an output increase request (NO in S130). ).

  When the degree of urgency is large, that is, when it is necessary to lower the output of engine 10 to be larger than the current output of engine 10 (YES in S200), and high response device (A) is operable (YES in S210), the control amount of the high response device (A) is calculated (S220), an operation command signal is output to the high response device (A) (S230), and the engine 10 is output by the high response device (A). Output is greatly reduced immediately.

  On the other hand, when the urgency level is large (YES in S200), if high-response device (A) is not in an operable state (NO in S210), high-response device (B) is selected and high-response device. The operation command signal is output to (S240, S250).

  Further, when the degree of urgency is not large (NO in S200), the low response device is selected, and after the control amount of the low response device and the control start timing are calculated (S260), the operation command is sent to the low response device. A signal is output (S270).

[When output increase is requested]
For example, if the driver depresses accelerator pedal 100, it is determined that there is an output increase request (YES in S130), and if the driver depresses accelerator pedal 100 greatly, it is determined that the degree of urgency is large (YES in S300). . In such a case, when the high response device is operable (YES in S310), the low response device and the high response device (A) are operated in combination, and an output increase request of engine 10 is issued. If the degree of urgency is high, an immediate response is made (S320, S330, S340, S350).

  On the other hand, if there is an output increase request and the degree of urgency is large but the high response device (A) is not in an operable state (NO in S310), the control amount and delay compensation amount of the low response device are calculated and the low response device The operation command signal is outputted to the engine 10 and the output of the engine 10 is increased by the low response device (S360, S370). At this time, since the delay compensation amount of the low response device is calculated and the operation command signal is output to the low response device based on the delay compensation amount, it is possible to cope with a case where the degree of urgency is large.

  On the other hand, if there is an output increase request but the degree of urgency is not large (NO in S300), the control amount of the low response device is calculated (S380), and an operation command signal is output to the low response device (S390). The low response device increases the output of the engine 10.

  With reference to FIGS. 10 to 12, changes in engine output in the engine control system according to the present embodiment will be described in comparison with conventional control. FIG. 10 shows changes in engine output (engine torque) in the engine control system according to the present embodiment, and FIGS. 11 and 12 show temporal changes in engine output when conventional control is used.

  As shown in FIG. 11, when the engine output increase command is given to the low response device based on the engine output increase command at time T (1), the engine output increases to TE (1). The response time is slow and it is not a control method with good responsiveness. As shown in FIG. 12, when the engine output reduction command is given to the high response device based on the engine output reduction command at time T (1), the temporal change in the output characteristics of the engine 10 increases. In some cases, too much shock is given to the driver of the vehicle.

  On the other hand, as shown in FIG. 10, for example, when there is an engine output increase request (YES in S130) and the urgency level is large (YES in S300), a high response device ( When A) is in an operable state (YES in S310), by combining the low response device and the high response device, the engine output can be gradually increased in consideration of the delay time, and the shock is reduced. Can be reduced.

  For example, as shown in FIG. 10, the control amount taking into account the delay compensation time in the low response device calculated at time T (1) is output at the same time as the operation command signal is output to the high response device at time T (1). The output of the engine 10 is increased from time T (1) to T (3) by the response device. In this way, the engine output (engine torque) can be gradually increased from time T (2) to time T (3). As a result, it is possible to avoid shocking the driver of the vehicle.

  As described above, the following operation can be realized by using the engine control system according to the present embodiment.

  When determining the device that controls the output of the engine 10, a device that can change the output of the engine 10 according to the difference between the current output of the engine 10 and the instantaneous required output of the engine 10 can be selected. At this time, the device can be selected depending on whether or not the device can be operated (functionally, performance restrictions, inoperable state due to failure), and the like. In particular, when the difference between the current output and the required output is large, it is judged that the degree of urgency is large and a device with good responsiveness is selected, or both devices with high responsiveness and devices with low responsiveness are combined. The output of the engine 10 can be changed quickly.

  Regarding the determination of the control amount of the engine output in each device, the control execution timing and the target control amount can be made variable according to the engine state such as the engine speed and the engine load and the vehicle state. In particular, when the urgency level is large and the high-response device cannot be used, the delay is compensated for the low-response device and the execution timing is advanced, and the control target value is set too high for control. By doing so, it is possible to cope with a case of high urgency even with a low response device.

  When the torque of the engine 10 is controlled by appropriately switching a plurality of devices, the response characteristics for each device are set, and the control that is the operation timing or the control amount of each device is set depending on the combination of devices used. Target value can be set.

  Further, for example, when the device that is executing the control becomes inoperable during the execution of the control of the requested output of the engine 10, for example, the control amount for each device is calculated when the output is requested. Keep it. Even if a device that changes the output of the engine 10 becomes inoperable by performing processing such as selecting and switching in order from the engine 10 or a device having little influence on the vehicle behavior, the engine 10 and the vehicle It is possible not to affect the behavior of.

  As described above, when the output of the engine is increased or decreased, the control start timing and the control target value corresponding to the responsiveness of each of the plurality of devices are given. Thereby, for example, it is possible to suppress a shift shock in a shift transition period caused by engine torque fluctuation. In addition, by appropriately combining a plurality of devices, it is possible to appropriately switch the characteristics set for each device when the engine output is increased or decreased, and to suppress a shock given to the driver of the vehicle.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 is a control block diagram of an engine control system including an internal combustion engine control device according to an embodiment of the present invention. It is a figure (the 1) which shows the map memorize | stored in engine ECU. FIG. 8 is a (second) diagram illustrating a map stored in the engine ECU. FIG. 6 is a diagram (No. 3) illustrating a map stored in an engine ECU. FIG. 7 is a diagram (No. 4) showing a map stored in the engine ECU. FIG. 10 is a diagram (No. 5) showing a map stored in the engine ECU. FIG. 6 is a diagram (No. 6) illustrating a map stored in an engine ECU. FIG. 7 is a view (No. 7) showing a map stored in an engine ECU. It is a flowchart which shows the control structure of the program performed by engine ECU. It is a timing chart which shows the state performed with engine ECU. It is a timing chart (the 1) which shows the state performed with conventional engine ECU. It is a timing chart (the 2) which shows the state performed with conventional engine ECU.

Explanation of symbols

  10 engine, 20 intake passage, 20A intake manifold, 30 exhaust passage, 30A exhaust manifold, 40 air cleaner, 50A, 50B, 50C, 50D injector, 60A, 60B, 60C, 60D spark plug, 70 catalytic converter, 80 throttle valve, 100 Accelerator pedal, 110 motor, 120 distributor, 130 igniter, 160 gear-type automatic transmission mechanism, 220 torque converter, 230 shift lever, 320 throttle opening sensor, 330 accelerator opening sensor, 340 intake pressure sensor, 350 oxygen sensor, 360 water temperature Sensor, 370 rotation speed sensor, 380 cylinder discrimination sensor, 410 vehicle speed sensor, 420 shift position sensor, 510 engine ECU, 520 ECT_ECU 530 VSC_ECU.

Claims (7)

Detection means for detecting the current output of the internal combustion engine;
Request detecting means for detecting a required output to the internal combustion engine;
Calculating means for calculating a difference between the current output and the requested output;
Selecting means for selecting a device based on the magnitude of the difference from a plurality of devices capable of changing the output of the internal combustion engine;
Control means for controlling the selected device;
The control means determines the timing for starting control of the selected device based on the magnitude of the difference so that the greater the difference, the earlier the timing for starting control of the selected device. A control device for an internal combustion engine, comprising: The plurality of devices include a plurality of devices with different responsiveness,
The control device for an internal combustion engine according to claim 1, wherein the selection unit includes a unit for selecting a device having higher responsiveness as the difference is larger. The control device further includes means for detecting whether or not each of the plurality of devices is operable,
When the selection unit detects an inoperable device among the plurality of devices, the selection unit has less influence on the behavior of the internal combustion engine among devices other than the inoperable devices in the plurality of devices. 2. The control apparatus for an internal combustion engine according to claim 1, comprising means for selecting devices in order.   The control apparatus for an internal combustion engine according to claim 1, wherein the control means includes means for setting a control target value of the selected device based on the magnitude of the difference.   The said control means includes the means for setting the control target value of the said selected device based on the magnitude | size of the said difference and the responsiveness of the said selected device, The any one of Claims 1-3 Control device for internal combustion engine. 4. The control means according to claim 1, wherein the control means includes means for determining when to start control of the selected device based on the responsiveness of the selected device in addition to the magnitude of the difference. The control apparatus of the internal combustion engine in any one.   The device is a device that changes the output of the internal combustion engine by the ignition timing control function, a device that changes the output of the internal combustion engine by the air-fuel ratio control function, a device that changes the output of the internal combustion engine by the throttle valve opening control function, and a partial fuel The control device for an internal combustion engine according to any one of claims 1 to 6, wherein the control device is one of devices for changing an output of the internal combustion engine by a cut cylinder control function.

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